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1.
Lesmana, Rama.
Finite Integration Method for a Time-Dependent Heat Source Identification of Inverse Problem.
Degree: คณะวิทยาศาสตร์และเทคโนโลยี ภาควิชาคณิตศาสตร์และวิทยาการคอมพิวเตอร์, 2017, Prince of Songkla University
URL: http://kb.psu.ac.th/psukb/handle/2016/11578 
► This study investigates an inverse problem of reconstructing a time wise- dependent source function for the heat equation. The solution of the problem is uniquely…
(more)
▼ This study investigates an inverse problem of reconstructing a
time wise-
dependent source function for the heat equation. The solution of the problem is uniquely solvable, yet unstable. The problem of finding the temperature when the heat source function is given, is called forward problem (or direct problem), whereas when the heat source function is unknown then the problem of two unknowns becomes to be called the inverse problem. In this study the inverse source problem is reformulated to be a new direct problem, meaning that the problem for two unknowns is transformed to be the problem for only one unknown. The proposed algorithm is not only easy to be used but also can give an accurate and stable solution. We propose that two kinds of the finite integration method combined with the backward finite difference method can be used to solve the reformulated heat equation. Furthermore, we also carried out the finite difference method for solving the inverse problem, this is in order to test the efficiency of the proposed method. Since the solution is unstable, the instability is overcome by employing the Tikhonov regularization method which is the method for stabilizing the problem. Numerical examples are presented and discussed to verify the accuracy of the proposed computational method. วิทยานิพนธ์เรื่องนี้เป็นการศึกษาการหาฟังก์ชันแหล่งกำเนิดที่ขึ้นกับเวลาของสมการความร้อนซึ่งเป็นปัญหาผกผัน ผลเฉลยของปัญหาผกผันนี้มีอยู่จริงและมีเพียงหนึ่งเดียวแต่เป็นผลเฉลยที่ไม่เสถียร สำหรับการศึกษาปัญหาของการคำนวณหาพลังงานความร้อน สำหรับปัญหาที่ต้องการคำนวณหา
อุณภูมิของระบบโดยทราบค่าของฟังก์ชันของแหล่งกำเนิดความร้อน (ปัญหามีตัวไม่ทราบค่า 1 ตัว) เราจะเรียกปัญหานี้ว่า ปัญหาตรง หรือ ปัญหาไปข้างหน้า แต่หากเราไม่ทราบฟังก์ชันของแหล่งกำเนิดความร้อนและยังต้องการคำนวณหาอุณภูมิและฟังก์ชันแหล่งความร้อนนี้ (ปัญหามีตัวไม่ทราบค่า 2 ตัว) เราจะเรียกปัญหานี้ว่า ปัญหาผกผัน สำหรับการศึกษาปัญหาผกผันนี้จะมีเทคนิคคือการแปลงระบบของปัญหาผกผันให้เป็นระบบของปัญหาตรงซึ่งหมายความว่าแปลงระบบจากปัญหาที่มีตัวไม่ทราบค่า 2 ตัว ให้เป็นระบบที่มีตัวไม่ทราบค่าเพียงแค่ตัวเดียว ขั้นตอนวิธีที่ได้นำเสนอในการศึกษานี้ ไม่เพียงแต่จะง่ายต่อการนำไปใช้ แต่ยังสามารถคำนวณหาผลเฉลยได้อย่างแม่นยำและมีเสถียรอีกด้วย ในการศึกษานี้ เราคาดหวังว่าระเบียบวิธีไฟไนต์อินทิเกรชันจะสามารถนำมาประยุกต์ใช้ในการหา
ผลเฉลยของปัญหาผกผันที่เราสนใจนี้ได้ และยิ่งไปกว่านี้เราได้ศึกษาการแก้ปัญหาผกผันนี้ด้วย ระเบียบวิธีพื้นฐานอย่างระเบียบวิธีผลต่างอันตะเพื่อเป็นการทดสอบเปรียบเทียบผลเฉลยที่ได้กับระเบียบวิธีที่เราคาดหวังไว้ และเนื่องจากปัญหานี้เป็นปัญหาผกผัน ซึ่งเป็นปัญหาที่ตั้งขึ้นอย่างเลว ทำให้ผลเฉลยที่ได้จากปัญหานี้ไม่เสถียร เราจึงทำให้ระบบมีเสถียรภาพด้วยการใช้เทคนิครีกูาลาไรเซชันของทิคคอนอฟ และเพื่อตรวจสอบความแม่นยำของระเบียบวิธีที่ศึกษานี้เราจึงได้นำเสนอตัวอย่าง
เชิงตัวเลขประกอบอีกด้วย
Advisors/Committee Members: Hazanee, Areena (advisor).
Subjects/Keywords: Time-Dependent
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APA (6th Edition):
Lesmana, R. (2017). Finite Integration Method for a Time-Dependent Heat Source Identification of Inverse Problem.
(Thesis). Prince of Songkla University. Retrieved from http://kb.psu.ac.th/psukb/handle/2016/11578
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lesmana, Rama. “Finite Integration Method for a Time-Dependent Heat Source Identification of Inverse Problem.
” 2017. Thesis, Prince of Songkla University. Accessed February 27, 2021.
http://kb.psu.ac.th/psukb/handle/2016/11578.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lesmana, Rama. “Finite Integration Method for a Time-Dependent Heat Source Identification of Inverse Problem.
” 2017. Web. 27 Feb 2021.
Vancouver:
Lesmana R. Finite Integration Method for a Time-Dependent Heat Source Identification of Inverse Problem.
[Internet] [Thesis]. Prince of Songkla University; 2017. [cited 2021 Feb 27].
Available from: http://kb.psu.ac.th/psukb/handle/2016/11578.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lesmana R. Finite Integration Method for a Time-Dependent Heat Source Identification of Inverse Problem.
[Thesis]. Prince of Songkla University; 2017. Available from: http://kb.psu.ac.th/psukb/handle/2016/11578
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Addis Ababa University
2.
HIRUY, TADDESE MENGISTU.
TIME DEPENDENT QUANTUM MECHANICAL APPROACH : CASE STUDIES OF AMMONIA MOLECULE
.
Degree: 2012, Addis Ababa University
URL: http://etd.aau.edu.et/dspace/handle/123456789/1426
► The aim of this thesis work is to implement time dependent Quantum mechanical approaches to study inversion phenomena of ammonia Molecule. This approaches will enable…
(more)
▼ The aim of this thesis work is to implement
time dependent Quantum mechanical
approaches to study inversion phenomena of ammonia Molecule. This approaches
will enable us visualize the
time evolution of the orientation of the molecule inside the
symmetric double well potentials. To study this approach diffusion Quantum Monte
Carlo(DQMC) method, which propagates the
time dependent Schr ̈dinger equation
o
in imaginary
time, had been used.
Since solving the schr ̈dinger equation exactly with double well potential is not pos-
o
sible, numerical approach had been used. In order to get each energy eigenstates,
the
time independent Schr ̈dinger equation with symmetric double well potential had
o
been descritised and changed in to eigenvalue problem. The QL and QR algorithm
had been used to solve the eigenvalue problem giving us energy eigenstates. The
wave functions corresponding to the eigen energy states had also been obtained. In
addition to this, the quantum mechanical energy splitting effect had been studied for
different symmetrical double well potentials.
The diffusion function will be obtained as a linear combination of the product of
wave function of the
time independent eigenfunctions which decay exponentially in
real
time. The probability density, which shows where the Nitrogen atom is most
probably to be found, being the square of the diffusion function. The full cycle of the
ammonia‘s orientation inside the symmetric double well had been done for different
time steps.
Finally comparison between theoretical and computational results had been done for
viii
different
time steps. The simulations shows that similar results had been found in
both theoretical and computational approaches.
Advisors/Committee Members: Gizaw Mengistu, (PhD) (advisor).
Subjects/Keywords: TIME DEPENDENT QUANTUM
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APA (6th Edition):
HIRUY, T. M. (2012). TIME DEPENDENT QUANTUM MECHANICAL APPROACH : CASE STUDIES OF AMMONIA MOLECULE
. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/1426
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
HIRUY, TADDESE MENGISTU. “TIME DEPENDENT QUANTUM MECHANICAL APPROACH : CASE STUDIES OF AMMONIA MOLECULE
.” 2012. Thesis, Addis Ababa University. Accessed February 27, 2021.
http://etd.aau.edu.et/dspace/handle/123456789/1426.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
HIRUY, TADDESE MENGISTU. “TIME DEPENDENT QUANTUM MECHANICAL APPROACH : CASE STUDIES OF AMMONIA MOLECULE
.” 2012. Web. 27 Feb 2021.
Vancouver:
HIRUY TM. TIME DEPENDENT QUANTUM MECHANICAL APPROACH : CASE STUDIES OF AMMONIA MOLECULE
. [Internet] [Thesis]. Addis Ababa University; 2012. [cited 2021 Feb 27].
Available from: http://etd.aau.edu.et/dspace/handle/123456789/1426.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
HIRUY TM. TIME DEPENDENT QUANTUM MECHANICAL APPROACH : CASE STUDIES OF AMMONIA MOLECULE
. [Thesis]. Addis Ababa University; 2012. Available from: http://etd.aau.edu.et/dspace/handle/123456789/1426
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Tulane University
3.
Dougherty, Kelly J.
Synthesis of compounds with very large specific rotations.
Degree: 2020, Tulane University
URL: https://digitallibrary.tulane.edu/islandora/object/tulane:120370
► [email protected]
A search in a research database for “large specific rotation” or anything similar produces few articles. Large specific rotation is not commonly used…
(more)
▼ [email protected]
A search in a research database for “large specific rotation” or anything similar produces few articles. Large specific rotation is not commonly used as an indicator for extraordinary chiroptical response. Alternatively, anisotropy factors obtained from circular dichroism spectra and calculated rotational strengths are more widely used to gauge chiroptical response. To another point, a search for “large chiroptical response” gives few articles that discuss pure organic compounds, and the result list is populated by organometallic clusters, nanostructures, and thin films. A search of the Reaxys database for organic compounds with [α]Ds larger than 1000 revealed that there are about 600, and there are only two that have [α]Ds larger than 10,000.30 We wondered if we could design a compound that would break the record in specific rotation and possess extraordinary chiroptical properties.
Guided by time-dependent density functional theory (TD-DFT) calculations, various chiral, polycyclic aromatic compounds (PACs) were chosen as candidates to display extraordinary chiroptical properties, such as high optical rotation, strong circular dichroism, or a high degree of circularly polarized luminescence (CPL). PACs comprise a large class of organic compounds. In addition to synthetic PACs, numerous naturally occurring PACs exist in coal tar and as decomposition products of organic material. Since their pi electrons are delocalized, PACs have interesting and possibly useful electronic properties and a variety of applications. The PACs described in this dissertation, e.g., helical mesobenzanthrones, a cyclophane, are twisted pentacenes are chiral and have interesting optoelectronic properties. TD-DFT was primarily used to predict which compounds had the greatest potential to yield record-breaking specific rotations or other chiroptical properties, and ordinary DFT calculation were used to determine if these compounds had sufficiently high racemization barriers to be resolved at room temperature. With regard to specific rotation, the accuracy of TD-DFT calculations was examined by comparing experimental specific rotations to the calculated values.
1
Kelly Jane Dougherty
Advisors/Committee Members: Pascal, Jr., Robert A. (Thesis advisor), School of Science & Engineering Chemistry (Degree granting institution).
Subjects/Keywords: time-dependent density functional theory
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APA ·
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APA (6th Edition):
Dougherty, K. J. (2020). Synthesis of compounds with very large specific rotations. (Thesis). Tulane University. Retrieved from https://digitallibrary.tulane.edu/islandora/object/tulane:120370
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Dougherty, Kelly J. “Synthesis of compounds with very large specific rotations.” 2020. Thesis, Tulane University. Accessed February 27, 2021.
https://digitallibrary.tulane.edu/islandora/object/tulane:120370.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dougherty, Kelly J. “Synthesis of compounds with very large specific rotations.” 2020. Web. 27 Feb 2021.
Vancouver:
Dougherty KJ. Synthesis of compounds with very large specific rotations. [Internet] [Thesis]. Tulane University; 2020. [cited 2021 Feb 27].
Available from: https://digitallibrary.tulane.edu/islandora/object/tulane:120370.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dougherty KJ. Synthesis of compounds with very large specific rotations. [Thesis]. Tulane University; 2020. Available from: https://digitallibrary.tulane.edu/islandora/object/tulane:120370
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
4.
Yang, Yuping.
Central Limit Theorems for Empirical Processes Based on Stochastic Processes.
Degree: PhD, Mathematics, 2013, Texas A&M University
URL: http://hdl.handle.net/1969.1/151373
► In this thesis, we study time-dependent empirical processes, which extend the classical empirical processes to have a time parameter; for example the empirical process for…
(more)
▼ In this thesis, we study
time-
dependent empirical processes, which extend the classical empirical processes to have a
time parameter; for example the empirical process for a sequence of independent stochastic processes {Yi : i ∈ N}:
(1) ν_n(t, y) = n^(−1/2 )Sigma[1_(Y i(t)¬<=y) – P(Yi(t) <= y)] from i=1 to n, t ∈ E, y ∈ R.
In the case of independent identically distributed samples (that is {Yi(t) : i ∈ N} are iid), Kuelbs et al. (2013) proved a Central Limit Theorem for ν_n(t, y) for a large class of stochastic processes.
In Chapter 3, we give a sufficient condition for the weak convergence of the weighted empirical process for iid samples from a uniform process:
(2) α_n(t, y) := n^(−1/2 )Sigma[w(y)(1_(X (t)<=y) – y)] from i=1 to n, t ∈ E, y ∈ [0, 1]
where {X (t), X1(t), X2(t), • • • } are independent and identically distributed uniform processes (for each t ∈ E, X (t) is uniform on (0, 1)) and w(x) is a “weight” function satisfying some regularity properties. Then we give an example when X (t) := Ft(Bt) : t ∈ E = [1, 2], where Bt is a Brownian motion and Ft is the distribution function of Bt.
In Chapter 4, we investigate the weak convergence of the empirical processes for non-iid samples. We consider the weak convergence of the empirical process:
(3) β_n(t, y) := n^(−1/2 )Sigma[(1_(Y (t)<=y) – Fi(t,y))] from i=1 to n, t ∈ E ⊂ R, y ∈ R
where {Yi(t) : i ∈ N} are independent processes and Fi(t, y) is the distribution function of Yi(t). We also prove that the covariance function of the empirical process for non-iid samples indexed by a uniformly bounded class of functions necessarily uniformly converges to the covariance function of the limiting Gaussian process for a CLT.
Advisors/Committee Members: Zinn, Joel (advisor), Johnson, William B. (committee member), Panchenko, Dmitry (committee member), Cline, Daren B.H. (committee member).
Subjects/Keywords: Central limit theorem; time dependent data
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APA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Yang, Y. (2013). Central Limit Theorems for Empirical Processes Based on Stochastic Processes. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151373
Chicago Manual of Style (16th Edition):
Yang, Yuping. “Central Limit Theorems for Empirical Processes Based on Stochastic Processes.” 2013. Doctoral Dissertation, Texas A&M University. Accessed February 27, 2021.
http://hdl.handle.net/1969.1/151373.
MLA Handbook (7th Edition):
Yang, Yuping. “Central Limit Theorems for Empirical Processes Based on Stochastic Processes.” 2013. Web. 27 Feb 2021.
Vancouver:
Yang Y. Central Limit Theorems for Empirical Processes Based on Stochastic Processes. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1969.1/151373.
Council of Science Editors:
Yang Y. Central Limit Theorems for Empirical Processes Based on Stochastic Processes. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151373
Universidade Nova
5.
Cardoso, Pedro Miguel Tenreiro.
Modeling and visualization of medical anesthesiology acts.
Degree: 2013, Universidade Nova
URL: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/11400
► Dissertação para obtenção do Grau de Mestre em Engenharia Informática
In recent years, medical visualization has evolved from simple 2D images on a light board…
(more)
▼ Dissertação para obtenção do Grau de Mestre em
Engenharia Informática
In recent years, medical visualization has evolved from simple 2D images on a light
board to 3D computarized images. This move enabled doctors to find better ways of
planning surgery and to diagnose patients. Although there is a great variety of 3D medical imaging software, it falls short when dealing with anesthesiology acts. Very little anaesthesia related work has been done. As a consequence, doctors and medical students have had little support to study the subject of anesthesia in the human body. We all are aware of how costly can be setting medical experiments, covering not just medical aspects but ethical and financial ones as well. With this work we hope to contribute for having better medical visualization tools in the area of anesthesiology. Doctors and in particular medical students should study anesthesiology acts more efficiently. They should be able to identify better locations to administrate the anesthesia, to study how long does it take for the anesthesia to affect patients, to relate the effect on patients with
quantity of anaesthesia provided, etc. In this work, we present a medical visualization
prototype with three main functionalities: image pre-processing, segmentation and rendering.
The image pre-processing is mainly used to remove noise from images, which were obtained via imaging scanners. In the segmentation stage it is possible to identify
relevant anatomical structures using proper segmentation algorithms. As a proof of concept, we focus our attention in the lumbosacral region of the human body, with
data acquired via MRI scanners. The segmentation we provide relies mostly in two algorithms:
region growing and level sets. The outcome of the segmentation implies the creation of a 3D model of the anatomical structure under analysis. As for the rendering, the 3D models are visualized using the marching cubes algorithm. The software we have
developed also supports time-dependent data. Hence, we could represent the anesthesia
flowing in the human body. Unfortunately, we were not able to obtain such type of data
for testing. But we have used human lung data to validate this functionality.
Advisors/Committee Members: Lopes, Adriano.
Subjects/Keywords: Anesthesiology; Medical visualization; Segmentation; Time-dependent data
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APA ·
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APA (6th Edition):
Cardoso, P. M. T. (2013). Modeling and visualization of medical anesthesiology acts. (Thesis). Universidade Nova. Retrieved from http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/11400
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Cardoso, Pedro Miguel Tenreiro. “Modeling and visualization of medical anesthesiology acts.” 2013. Thesis, Universidade Nova. Accessed February 27, 2021.
http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/11400.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cardoso, Pedro Miguel Tenreiro. “Modeling and visualization of medical anesthesiology acts.” 2013. Web. 27 Feb 2021.
Vancouver:
Cardoso PMT. Modeling and visualization of medical anesthesiology acts. [Internet] [Thesis]. Universidade Nova; 2013. [cited 2021 Feb 27].
Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/11400.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cardoso PMT. Modeling and visualization of medical anesthesiology acts. [Thesis]. Universidade Nova; 2013. Available from: http://www.rcaap.pt/detail.jsp?id=oai:run.unl.pt:10362/11400
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Illinois – Chicago
6.
Schuler, Francesca.
Generating Control Policies for Timed Discrete-Event Systems through Efficient State Space Exploration.
Degree: 2016, University of Illinois – Chicago
URL: http://hdl.handle.net/10027/20964
► Production systems are event driven and require knowledge of timing of events across all elements of the system particularly when developing policies for production control.…
(more)
▼ Production systems are event driven and require knowledge of timing of events across all elements of the system particularly when developing policies for production control. A suite of
time-
dependent models are derived for a class of discrete systems, in particular, an N-Server, N+1-Buffer sequential line. First,
time-
dependent models for buffers and servers are derived. From the
time-
dependent server and buffer arrival and departure models the maximum number of entities any buffer in the serial line will experience across all times is derived. One assumption is then relaxed, thereby reducing the capacity of a queue. The transition and block times for all queues and servers are derived and
time-
dependent models for server and queue arrivals and departures are developed. Lastly, a buffer cluster concept is proposed and a
time based parametric model is derived that determines the sizing of the buffer cluster. A reduced
time space for which to search for the buffer cluster sizing is derived and a model that determines an optimal buffer clustering policy is presented. Real world production examples are used to illustrate where the models are utilized and discuss several additional applications and benefits of the models.
Advisors/Committee Members: Darabi, Houshang (advisor), He, David (committee member), Buy, Ugo (committee member), Babin, Thomas (committee member), Gyorfi, Julius (committee member).
Subjects/Keywords: Time Dependent; Buffer Cluster; Production; Manufacturing
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APA ·
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Manager
APA (6th Edition):
Schuler, F. (2016). Generating Control Policies for Timed Discrete-Event Systems through Efficient State Space Exploration. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/20964
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Schuler, Francesca. “Generating Control Policies for Timed Discrete-Event Systems through Efficient State Space Exploration.” 2016. Thesis, University of Illinois – Chicago. Accessed February 27, 2021.
http://hdl.handle.net/10027/20964.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Schuler, Francesca. “Generating Control Policies for Timed Discrete-Event Systems through Efficient State Space Exploration.” 2016. Web. 27 Feb 2021.
Vancouver:
Schuler F. Generating Control Policies for Timed Discrete-Event Systems through Efficient State Space Exploration. [Internet] [Thesis]. University of Illinois – Chicago; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10027/20964.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Schuler F. Generating Control Policies for Timed Discrete-Event Systems through Efficient State Space Exploration. [Thesis]. University of Illinois – Chicago; 2016. Available from: http://hdl.handle.net/10027/20964
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manitoba
7.
Birur, Anand.
Time-dependent damage evolution in multidirectional polymer matrix composite laminates.
Degree: Mechanical and Manufacturing Engineering, 2008, University of Manitoba
URL: http://hdl.handle.net/1993/3035
► Multi-directional polymer matrix composite materials are increasingly used in load-bearing structural applications ranging from primary aircraft structures and automotive parts to rehabilitation of bridges. Long-term…
(more)
▼ Multi-directional polymer matrix composite materials are increasingly used in load-bearing structural applications ranging from primary aircraft structures and automotive parts to rehabilitation of bridges. Long-term durability, characterized by
time-
dependent degradation in strength (known as creep-rupture) and modulus (known as creep), is an important concern in these applications. Despite the experimental evidence on the influence of
time-
dependent damage on creep and creep rupture of multi-directional composites, current level of understanding of this is very limited. Hence, the focus of this thesis is to develop a clear understanding of the
time dependent evolution of various damage modes and their influence on creep rupture of polymer matrix composite laminates.Three laminates [0/90/0], [±45/902]s, and [0/902]s were subjected to a wide range of constant stresses at various test temperatures and creep rupture
time was recorded.The various damage modes that developed, with stress during tensile testing, and with
time during constant stress creep rupture testing were transverse cracking, vertical cracking, delamination, vertical splitting and fiber fracture.The appearance of these damages were
time dependent confirming that the FPF stress is
time-
dependent, while the conventional wisdom is to consider it to be
time-independent in design. Beyond FPF, the damage continued to evolve for a certain period of
time beyond which additional damage modes started to evolve influencing the evolution rate of one-another.The percentage of creep rupture
time during which a single mode of damage was evolving decreased with increase in applied stress and test temperature.Based on these results it is concluded that creep rupture of multidirectional laminates is influenced by contributions from a complex interaction of various damage modes that evolve with
time, suggesting that creep rupture predictions could be good approximations only.
Advisors/Committee Members: Jayaraman, Raghavan (Mechanical and Manufacturing Engineering) (supervisor), Wang,Abraham (Mechanical and Manufacturing Engineering) Shalaby,Ahmed (Civil Engineering) (examiningcommittee).
Subjects/Keywords: PMC; Time-dependent
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APA (6th Edition):
Birur, A. (2008). Time-dependent damage evolution in multidirectional polymer matrix composite laminates. (Masters Thesis). University of Manitoba. Retrieved from http://hdl.handle.net/1993/3035
Chicago Manual of Style (16th Edition):
Birur, Anand. “Time-dependent damage evolution in multidirectional polymer matrix composite laminates.” 2008. Masters Thesis, University of Manitoba. Accessed February 27, 2021.
http://hdl.handle.net/1993/3035.
MLA Handbook (7th Edition):
Birur, Anand. “Time-dependent damage evolution in multidirectional polymer matrix composite laminates.” 2008. Web. 27 Feb 2021.
Vancouver:
Birur A. Time-dependent damage evolution in multidirectional polymer matrix composite laminates. [Internet] [Masters thesis]. University of Manitoba; 2008. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1993/3035.
Council of Science Editors:
Birur A. Time-dependent damage evolution in multidirectional polymer matrix composite laminates. [Masters Thesis]. University of Manitoba; 2008. Available from: http://hdl.handle.net/1993/3035
University of Waterloo
8.
Lizdek, Ivana.
Temporal Dynamics in the Interpersonal Behaviour and Perceptions of Romantic Partners.
Degree: 2016, University of Waterloo
URL: http://hdl.handle.net/10012/11101
► The current study investigates romantic partners’ perceptions of their own and their partner’s interpersonal behaviour as they unfold continuously over the course of an interaction.…
(more)
▼ The current study investigates romantic partners’ perceptions of their own and their partner’s interpersonal behaviour as they unfold continuously over the course of an interaction. In particular, we examine the types of biases that affect partners’ perceptions of themselves and each other. Using a joystick-based assessment program, 59 romantic couples rated moment-to
moment fluctuations in dominance and affiliation in themselves and their partners as they watched a video of their own behaviour in a previous, relatively unstructured collaborative task. To provide a benchmark of comparison, independent observers applied the same coding technique to provide continuous ratings of behaviour for each participant. Partners also
completed several paper-and-pencil measures, which tapped their levels of trait dominance and affiliation, as well as other characteristics of each person and their relationship. Joystick data for both participants and observers were used to calculate overall (mean) and moment-to-moment indices of dominance and affiliation. Indices were also derived across partners for overall and moment-to-moment reciprocity and correspondence. Findings for overall levels of dominance and affiliation suggest that partners’ perceptions reflected several types of bias. For instance, apart from the presence of the well-established positivity and projection biases, our results for perceptions of one’s partner’s dominance revealed a presumed reciprocity bias in which the partner was perceived to have behaved in a manner more opposite to one’s own overall level of dominance than was actually true. Nonetheless, we found that such biases occurred in the context of considerable accurate understanding in perceptions of oneself and one’s partner. At the moment-to-moment level, findings revealed that partners were able to reliably track interpersonal behaviour for both targets as it was unfolding continuously across time. However, large individual differences in partners’ moment-to-moment tracking ability emerged. Finally, we demonstrated that partners’ interpersonal behaviours and perceptions were related to relationship satisfaction in important ways. Specifically, partners’ overall affiliation during the task and the extent to which their affiliation levels matched each other were related positively to relationship
satisfaction. In addition, partners who were able to pass control skillfully throughout the course of the interaction, a phenomenon termed reciprocity, reported being more satisfied. Similarly, couples with greater ability to track moment-to-moment fluctuations in their levels of dominance also reported higher relationship satisfaction.
Subjects/Keywords: romantic couples; interpersonal theory; time-dependent patterns
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APA (6th Edition):
Lizdek, I. (2016). Temporal Dynamics in the Interpersonal Behaviour and Perceptions of Romantic Partners. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/11101
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lizdek, Ivana. “Temporal Dynamics in the Interpersonal Behaviour and Perceptions of Romantic Partners.” 2016. Thesis, University of Waterloo. Accessed February 27, 2021.
http://hdl.handle.net/10012/11101.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lizdek, Ivana. “Temporal Dynamics in the Interpersonal Behaviour and Perceptions of Romantic Partners.” 2016. Web. 27 Feb 2021.
Vancouver:
Lizdek I. Temporal Dynamics in the Interpersonal Behaviour and Perceptions of Romantic Partners. [Internet] [Thesis]. University of Waterloo; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10012/11101.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lizdek I. Temporal Dynamics in the Interpersonal Behaviour and Perceptions of Romantic Partners. [Thesis]. University of Waterloo; 2016. Available from: http://hdl.handle.net/10012/11101
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of New South Wales
9.
Gholamhoseini, Alireza.
Time-Dependent Behaviour of Composite Concrete Slabs.
Degree: Civil & Environmental Engineering, 2014, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/53606
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12301/SOURCE02?view=true
► Composite one-way concrete floor slabs with profiled steel decking as permanent formwork are commonly used in the construction industry. Despite their common usage, relatively little…
(more)
▼ Composite one-way concrete floor slabs with profiled steel decking as permanent formwork are commonly used in the construction industry. Despite their common usage, relatively little research has been undertaken on the in-service behaviour of such slabs and little guidance is available to practising engineers. Most previous experimental studies of composite slabs incorporating steel decking have involved short-term load tests that have concentrated on the strength, ductility and failure mode of the slabs. Long-term testing to study the
time-
dependent service load behaviour and in particular, the effects of creep and shrinkage of the concrete in this increasingly popular form of construction have been largely neglected.There exists an urgent need for research on the serviceability of composite slabs, as excessive deflection is often the critical design consideration, especially in long-span slabs. The situation has been exacerbated in recent years with the advent of high strength materials (both concrete and steel) without significantly higher stiffness, and the development of a wide range of new and innovative decking profiles. Serviceability rather than strength is often the governing limit state in the design of concrete elements, particularly in shallow deflection-sensitive elements such as floor slabs.The research in this thesis is the first detailed study of the effects of creep and shrinkage on the in-service behaviour of composite slabs. Laboratory experiments have been conducted on composite slabs to measure: the distribution of shrinkage strain through the thickness of the slabs; shrinkage-induced deflections in the slabs and
time-
dependent deflections and cracking under sustained loads. Analytical models have been developed and calibrated to predict these effects and reliable design guidance has been presented for the construction industry and practising design engineers. The change in the bond-slip relationship between profiled steel decking and concrete slab with
time due to creep and shrinkage was not identified previously. The
time-
dependent effects of creep and shrinkage on the bond-slip characteristics for slabs with profiled decking during extended periods under sustained service loads have also been investigated.
Advisors/Committee Members: Gilbert, Raymond , Civil & Environmental Engineering, Faculty of Engineering, UNSW.
Subjects/Keywords: Serviceability; Composite slab; Creep; Shrinkage; Time-dependent
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APA (6th Edition):
Gholamhoseini, A. (2014). Time-Dependent Behaviour of Composite Concrete Slabs. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/53606 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12301/SOURCE02?view=true
Chicago Manual of Style (16th Edition):
Gholamhoseini, Alireza. “Time-Dependent Behaviour of Composite Concrete Slabs.” 2014. Doctoral Dissertation, University of New South Wales. Accessed February 27, 2021.
http://handle.unsw.edu.au/1959.4/53606 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12301/SOURCE02?view=true.
MLA Handbook (7th Edition):
Gholamhoseini, Alireza. “Time-Dependent Behaviour of Composite Concrete Slabs.” 2014. Web. 27 Feb 2021.
Vancouver:
Gholamhoseini A. Time-Dependent Behaviour of Composite Concrete Slabs. [Internet] [Doctoral dissertation]. University of New South Wales; 2014. [cited 2021 Feb 27].
Available from: http://handle.unsw.edu.au/1959.4/53606 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12301/SOURCE02?view=true.
Council of Science Editors:
Gholamhoseini A. Time-Dependent Behaviour of Composite Concrete Slabs. [Doctoral Dissertation]. University of New South Wales; 2014. Available from: http://handle.unsw.edu.au/1959.4/53606 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:12301/SOURCE02?view=true
Penn State University
10.
Karschner, Kyle Allan.
Effects of Creep and Shrinkage on Time-dependent Strain and Curvature of R/C Members.
Degree: 2012, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/12752
► The long-time deflection multiplier specified in the ACI Code is simple to use, but neglects the effects of several parameters such as age at loading…
(more)
▼ The long-
time deflection multiplier specified in the ACI Code is simple to use, but neglects the effects of several parameters such as age at loading and reinforcement ratio that are known to have significant effects on long-
time slab deflections. Several authors including Branson (1977), Sbarounis (1984(a)), and Graham and Scanlon (1986) have made recommendations in the past to increase the long-
time multiplier for application to two-way slabs, however, no systemic study has been found that would provide a sound theoretical basis to justify such recommendations.
The research documented in this thesis examines the factors that influence long-
time deflections from a theoretical viewpoint at the member section level using a
time- step method of analysis developed from established principles. The
time-step analysis traces the effects of creep and shrinkage on the
time-
dependent strain and curvature of various member sections. A parametric study is performed using the developed algorithm to evaluate the limitations of the existing ACI 318-11 long-
time multiplier (λΔ) used in calculating two-way slab deflections. Results of the parametric study are used to provide designers with insight as to which factors have the most influence on long-term deflections and recommend methods of dealing with design problems engineers face.
Advisors/Committee Members: Andrew Scanlon, Thesis Advisor/Co-Advisor.
Subjects/Keywords: creep; shrinkage; time-dependent; long-time multiplier; strain; curvature; deformation; deflection
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APA (6th Edition):
Karschner, K. A. (2012). Effects of Creep and Shrinkage on Time-dependent Strain and Curvature of R/C Members. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/12752
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Karschner, Kyle Allan. “Effects of Creep and Shrinkage on Time-dependent Strain and Curvature of R/C Members.” 2012. Thesis, Penn State University. Accessed February 27, 2021.
https://submit-etda.libraries.psu.edu/catalog/12752.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Karschner, Kyle Allan. “Effects of Creep and Shrinkage on Time-dependent Strain and Curvature of R/C Members.” 2012. Web. 27 Feb 2021.
Vancouver:
Karschner KA. Effects of Creep and Shrinkage on Time-dependent Strain and Curvature of R/C Members. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Feb 27].
Available from: https://submit-etda.libraries.psu.edu/catalog/12752.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Karschner KA. Effects of Creep and Shrinkage on Time-dependent Strain and Curvature of R/C Members. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/12752
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Cape Town
11.
Nwoko, Onyekachi Esther.
Approaches for Handling Time-Varying Covariates in Survival Models.
Degree: MSc, Statistical Sciences, 2019, University of Cape Town
URL: http://hdl.handle.net/11427/31187
► Survival models are used in analysing time-to-event data. This type of data is very common in medical research. The Cox proportional hazard model is commonly…
(more)
▼ Survival models are used in analysing
time-to-event data. This type of data is very common in medical research. The Cox proportional hazard model is commonly used in analysing
time-to-event data. However, this model is based on the proportional hazard (PH) assumption. Violation of this assumption often leads to biased results and inferences. Once non-proportionality is established, there is a need to consider
time-varying effects of the covariates. Several models have been developed that relax the proportionality assumption making it possible to analyse data with
time-varying effects of both baseline and
time-updated covariates. I present various approaches for handling
time-varying covariates and
time-varying effects in
time-to-event models. They include the extended Cox model which handles exogenous
time-
dependent covariates using the counting process formulation introduced by cite{andersen1982cox}. Andersen and Gill accounts for
time varying covariates by each individual having multiple observations with the total-at-risk follow up for each individual being further divided into smaller
time intervals. The joint models for the longitudinal and
time-to-event processes and its extensions (parametrization and multivariate joint models) were used as it handles endogenous
time-varying covariates appropriately. Another is the Aalen model, an additive model which accounts for
time-varying effects. However, there are situations where all the covariates of interest do not have
time-varying effects. Hence, the semi-parametric additive model can be used. In conclusion, comparisons are made on the results of all the fitted models and it shows that choice of a particular model to fit is influenced by the aim and objectives of fitting the model. In 2002, an AntiRetroviral Treatment (ART) service was established in the Cape Town township of Gugulethu, South Africa. These models will be applied to an HIV/AIDS observational dataset obtained from all patients who initiated ART within the programme between September 2002 and June 2007.
Advisors/Committee Members: Little, Francesca (advisor).
Subjects/Keywords: Survival models; longitudinal models; time-dependent effects; time-varying covariates
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Manager
APA (6th Edition):
Nwoko, O. E. (2019). Approaches for Handling Time-Varying Covariates in Survival Models. (Masters Thesis). University of Cape Town. Retrieved from http://hdl.handle.net/11427/31187
Chicago Manual of Style (16th Edition):
Nwoko, Onyekachi Esther. “Approaches for Handling Time-Varying Covariates in Survival Models.” 2019. Masters Thesis, University of Cape Town. Accessed February 27, 2021.
http://hdl.handle.net/11427/31187.
MLA Handbook (7th Edition):
Nwoko, Onyekachi Esther. “Approaches for Handling Time-Varying Covariates in Survival Models.” 2019. Web. 27 Feb 2021.
Vancouver:
Nwoko OE. Approaches for Handling Time-Varying Covariates in Survival Models. [Internet] [Masters thesis]. University of Cape Town; 2019. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11427/31187.
Council of Science Editors:
Nwoko OE. Approaches for Handling Time-Varying Covariates in Survival Models. [Masters Thesis]. University of Cape Town; 2019. Available from: http://hdl.handle.net/11427/31187
The Ohio State University
12.
Zhu, Ying.
A Comparison of Calculation by Real-Time and by
Linear-Response Time-Dependent Density Functional Theory in the
Regime of Linear Optical Response.
Degree: MS, Chemical Physics, 2016, The Ohio State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1460554444
► We present a method to calculate the excited electronic structure of chemical systems via a real-time approach by using time-dependent density functional theory (TDDFT), i.e.…
(more)
▼ We present a method to calculate the excited
electronic structure of chemical systems via a real-
time approach
by using
time-
dependent density functional theory (TDDFT), i.e.
real-
time TDDFT. The conventional approach of TDDFT is solving the
linear response in frequency domain, which we denote here as
linear-response TDDFT (LR-TDDFT). Real-
time TDDFT (RT-TDDFT) is
calculated by integrating the propagation over the
time. Detailed
deduction and algorithms of RT-TDDFT are discussed. The computation
algorithms of the pilot codes for the RT-TDDFT implementation in
the Q-Chem quantum chemistry software package is thoroughly
checked. The codes of RT-TDDFT are merged into the main develop
version of Q-Chem. The computation results are compared between
LR-TDDFT and RT-TDDFT. The results show a good match between
LR-TDDFT and RT-TDDFT calculation. This proves the validity of
RT-TDDFT calculation implementation and prepare us for the future
study on the excited states electronic structure and dynamics via
the real-
time approach.
Advisors/Committee Members: Herbert, John (Advisor).
Subjects/Keywords: Physical Chemistry; real-time time-dependent density functional
theory; RT-TDDFT
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Manager
APA (6th Edition):
Zhu, Y. (2016). A Comparison of Calculation by Real-Time and by
Linear-Response Time-Dependent Density Functional Theory in the
Regime of Linear Optical Response. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1460554444
Chicago Manual of Style (16th Edition):
Zhu, Ying. “A Comparison of Calculation by Real-Time and by
Linear-Response Time-Dependent Density Functional Theory in the
Regime of Linear Optical Response.” 2016. Masters Thesis, The Ohio State University. Accessed February 27, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1460554444.
MLA Handbook (7th Edition):
Zhu, Ying. “A Comparison of Calculation by Real-Time and by
Linear-Response Time-Dependent Density Functional Theory in the
Regime of Linear Optical Response.” 2016. Web. 27 Feb 2021.
Vancouver:
Zhu Y. A Comparison of Calculation by Real-Time and by
Linear-Response Time-Dependent Density Functional Theory in the
Regime of Linear Optical Response. [Internet] [Masters thesis]. The Ohio State University; 2016. [cited 2021 Feb 27].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1460554444.
Council of Science Editors:
Zhu Y. A Comparison of Calculation by Real-Time and by
Linear-Response Time-Dependent Density Functional Theory in the
Regime of Linear Optical Response. [Masters Thesis]. The Ohio State University; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1460554444
Georgia Tech
13.
Che, Kaikai.
Nonlinear mechanics of multimaterial thermoviscoelastic architected materials with snap-through instabilities.
Degree: PhD, Mechanical Engineering, 2018, Georgia Tech
URL: http://hdl.handle.net/1853/62190
► Architected materials have unusual and interesting properties that are typically unachievable using conventional materials. Many researchers have previously focused on the design and analysis of…
(more)
▼ Architected materials have unusual and interesting properties that are typically unachievable using conventional materials. Many researchers have previously focused on the design and analysis of architected materials with snap-through instabilities. This thesis aims to investigate the influence of geometric parameters, temperature and
time on the snap-through
buckling of one-dimensional (1D) thermoviscoelastic architected materials for applications as reconfigurable architected materials. Rigorous theoretical models of a unit cell with snap-through instabilities are first developed for both the cases of elastic and thermoviscoelastic constitutive models. These theoretical models are utilized to analyze the influence of geometric design, temperature and strain rate on the mechanics of the unit cell. With the
understanding of the nonlinear mechanics of the unit cells, strategies (such as introducing small geometric variations in the unit cell design or varying the temperature) are proposed
and implemented to tune the snapping sequences of architected materials made of unit cells with snap-through instabilities. With the help of the theoretical model, FEA simulations
and experiments, temperature is utilized to tune the snapping sequence of these multimaterial architected materials after their fabrication. Furthermore, it is shown that a
time-
dependent snapping behavior can be observed in a viscoelastic architected material that has snap-through instabilities. The influence of geometric parameters and temperature on this
time-
dependent snapping is analyzed. The results provide fundamental understandings of interesting mechanical response that depends on
time and temperature, which could help to design and develop reconfigurable and programmable architected materials with tunable properties.
Advisors/Committee Members: Meaud, Julien (advisor), Qi, H. Jerry (committee member), Erturk, Alper (committee member), Ruzzene, Massimo (committee member), Rimoli, Julian Jose (committee member).
Subjects/Keywords: Nonlinear mechanics; Thermoviscoelastic; Architected materials; Snap-through instabilities; Time-dependent; Temperature-dependent
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Manager
APA (6th Edition):
Che, K. (2018). Nonlinear mechanics of multimaterial thermoviscoelastic architected materials with snap-through instabilities. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/62190
Chicago Manual of Style (16th Edition):
Che, Kaikai. “Nonlinear mechanics of multimaterial thermoviscoelastic architected materials with snap-through instabilities.” 2018. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/62190.
MLA Handbook (7th Edition):
Che, Kaikai. “Nonlinear mechanics of multimaterial thermoviscoelastic architected materials with snap-through instabilities.” 2018. Web. 27 Feb 2021.
Vancouver:
Che K. Nonlinear mechanics of multimaterial thermoviscoelastic architected materials with snap-through instabilities. [Internet] [Doctoral dissertation]. Georgia Tech; 2018. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/62190.
Council of Science Editors:
Che K. Nonlinear mechanics of multimaterial thermoviscoelastic architected materials with snap-through instabilities. [Doctoral Dissertation]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/62190
University of Michigan
14.
Gong, Qi.
Semiparametric Methods for Estimating the Effect of a Longitudinal Covariate and Time-Dependent Treatment on Survival Using Observational Data with Dependent Censoring.
Degree: PhD, Biostatistics, 2012, University of Michigan
URL: http://hdl.handle.net/2027.42/96171
► The methods proposed in this dissertation are motivated by issues in the analysis of liver transplant data. In the first project, we propose semiparametric methods…
(more)
▼ The methods proposed in this dissertation are motivated by issues in the analysis of liver transplant data. In the first project, we propose semiparametric methods for estimating the effect of a
time-
dependent covariate on treatment-free survival. The data structure of interest consists of a longitudinal sequence of measurements and a potentially censored survival
time. Treatment-free survival is of interest and is dependently censored by the receipt of treatment. Patients may be removed from consideration for treatment, temporarily or permanently. The proposed methods involve landmark analysis and partly conditional hazard regression.
Dependent censoring is overcome by Inverse Probability of Censoring Weighting (IPCW).
Mean survival
time can be used to quantify both the patient-specific and average effect of a
time-
dependent treatment. In the second project, we propose semiparametric methods for estimating the mean difference between treatment-free and post-treatment restricted mean lifetime. Treatment-free survival is dependently censored by the receipt of treatment. Landmark analysis, partly conditional hazard regression, and IPCW are used to model treatment-free survival. The post-treatment death hazard is modeled using the measurement history leading up to the treatment
time. The average treatment effect is obtained by averaging over subjects who received treatment.
In
time to event data observed in medical studies, nonproportional hazards and
dependent censoring are common issues when comparing group-specific mortality. In settings where the proportional hazard assumption fails, investigators tend to be more interested in cumulative effects on mortality rather than the instantaneous effect. Therefore, in the third project, we propose an estimator for the cumulative group effect on survival in the presence of nonproportional hazards and
dependent censoring. The proposed estimator is based on the cumulative hazard function, assumed to follow a stratified Cox model. No functional form needs to be assumed for the nonproportionality.
Each of the proposed methods is shown to be consistent and asymptotically normal, with consistent covariance estimators provided. Simulation studies reveal that the proposed estimation procedures are appropriate for practical use. We apply the proposed methods to pre- and post-transplant data among End-stage Liver Disease (ESLD) patients using data from a national organ transplant registry.
Advisors/Committee Members: Schaubel, Douglas E. (committee member), Merion, Robert M. (committee member), Kalbfleisch, John D. (committee member), Zhang, Min (committee member).
Subjects/Keywords: Survival Analysis; Proportional Hazard Regression; Dependent Censoring; Time-dependent Treatment; Mean Survival Time; Cumulative Hazard; Public Health; Health Sciences
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Manager
APA (6th Edition):
Gong, Q. (2012). Semiparametric Methods for Estimating the Effect of a Longitudinal Covariate and Time-Dependent Treatment on Survival Using Observational Data with Dependent Censoring. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/96171
Chicago Manual of Style (16th Edition):
Gong, Qi. “Semiparametric Methods for Estimating the Effect of a Longitudinal Covariate and Time-Dependent Treatment on Survival Using Observational Data with Dependent Censoring.” 2012. Doctoral Dissertation, University of Michigan. Accessed February 27, 2021.
http://hdl.handle.net/2027.42/96171.
MLA Handbook (7th Edition):
Gong, Qi. “Semiparametric Methods for Estimating the Effect of a Longitudinal Covariate and Time-Dependent Treatment on Survival Using Observational Data with Dependent Censoring.” 2012. Web. 27 Feb 2021.
Vancouver:
Gong Q. Semiparametric Methods for Estimating the Effect of a Longitudinal Covariate and Time-Dependent Treatment on Survival Using Observational Data with Dependent Censoring. [Internet] [Doctoral dissertation]. University of Michigan; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2027.42/96171.
Council of Science Editors:
Gong Q. Semiparametric Methods for Estimating the Effect of a Longitudinal Covariate and Time-Dependent Treatment on Survival Using Observational Data with Dependent Censoring. [Doctoral Dissertation]. University of Michigan; 2012. Available from: http://hdl.handle.net/2027.42/96171
University of Southern California
15.
Demiryurek, Ugur.
Query processing in time-dependent spatial networks.
Degree: PhD, Computer Science, 2014, University of Southern California
URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/120837/rec/5376
► Recent advances in online map services and their wide deployment in hand-held devices and car-navigation systems have led to extensive use of location-based services. The…
(more)
▼ Recent advances in online map services and their wide
deployment in hand-held devices and car-navigation systems have led
to extensive use of location-based services. The most popular class
of such services are route planning and k-nearest neighbor(kNN)
queries where users search for geographical points of interests
(e.g., restaurants, gas stations) with corresponding travel-times
to these locations. Accordingly, many recent studies focused on
developing efficient techniques to answer point-to-point fastest
path and k-nearest neighbor search queries in the spatial network
space. ❧ However, most of the existing approaches in spatial
networks make the simplifying assumption that the cost of traveling
each edge of the spatial network is constant (e.g., corresponding
to the length of the edge). Whereas in real world, the actual
travel cost of a network edge is
time-
dependent i.e., the cost of a
network edge depends on the arrival-
time to that edge.
Unfortunately, once we consider the
time-
dependent edge weights in
road networks, all proposed kNN and shortest path query solutions
assuming constant edge weights fail. With
time-
dependent edge
costs, the network distance between two nodes is not unique and
varies based on the departure
time from the source. This dynamism
of the distance introduces great challenges in developing
precomputation techniques to expedite spatial query processing in
time-
dependent spatial networks. ❧ In this thesis, for the first
time we study the problem of k-nearest neighbor search in
time-
dependent road networks where the weight of each edge is a
function of
time. We propose series of index structures that
efficiently and accurately answer the k nearest neighbor queries in
time-
dependent road networks and effectively handle the database
updates where points of interests are added or removed. In
addition, we study the problem of point-to-point shortest path
computation in
time-
dependent spatial networks and present a
technique which speeds-up the path computation using a
bidirectional timedependent A* search based on a novel heuristic
function. In this thesis, the efficacy of all proposed techniques
for both kNN search and point-to-point shortest path computation
have been verified with extensive experiments using real data-sets
including a variety of large spatial networks with real traffic
data.
Advisors/Committee Members: Shahabi, Cyrus (Committee Chair), Nakano, Aiichiro (Committee Member), Giuliano, Genevieve (Committee Member).
Subjects/Keywords: k nearest neighbor search; road networks; shortest path; spatial networks; time-dependent road networks; time-dependent shortest path
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Manager
APA (6th Edition):
Demiryurek, U. (2014). Query processing in time-dependent spatial networks. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/120837/rec/5376
Chicago Manual of Style (16th Edition):
Demiryurek, Ugur. “Query processing in time-dependent spatial networks.” 2014. Doctoral Dissertation, University of Southern California. Accessed February 27, 2021.
http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/120837/rec/5376.
MLA Handbook (7th Edition):
Demiryurek, Ugur. “Query processing in time-dependent spatial networks.” 2014. Web. 27 Feb 2021.
Vancouver:
Demiryurek U. Query processing in time-dependent spatial networks. [Internet] [Doctoral dissertation]. University of Southern California; 2014. [cited 2021 Feb 27].
Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/120837/rec/5376.
Council of Science Editors:
Demiryurek U. Query processing in time-dependent spatial networks. [Doctoral Dissertation]. University of Southern California; 2014. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/120837/rec/5376
KTH
16.
Lundkvist, Henrik.
Robust Vehicle Routing in an Urban Setting.
Degree: Optimization and Systems Theory, 2016, KTH
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-186248
► In this thesis, the vehicle routing problem with stochastic, and time dependent, travel times is studied. The stochastic travel times are estimated from historical…
(more)
▼ In this thesis, the vehicle routing problem with stochastic, and time dependent, travel times is studied. The stochastic travel times are estimated from historical drive data. The variation of the drive times, as well as that of the variance, during the day was modeled. The purpose of the thesis was to propose a method of handling the congestion related traffic impediments in an urban setting. Since the majority of times of delivery in the empirical test cases studied correlate with the time period of high traffic load, an efficient and robust handling of such traffic scenarios is of high importance. It is shown that the stochastic models will shift the estimated arrivals to customers from the more volatile early and late extremes to more central regions of the time window. Previously delivered routes were evaluated both with the standard algorithm and the proposed stochastic algorithm. The difference between the actual drive times and the calculated drive times were analyzed by studying the correlation of the drive times between each customer in the route. It was shown that the routes of the proposed stochastic method increased this correlation. The drive times between nodes where also perturbed with a Gamma distributed noise. The results from the stochastic algorithm showed higher resilience to this disturbance than did the deterministic models.
I detta examensarbete har fordonsruttningsproblemet, VRP, med stokastiska och tidsberonds körtider behandlöats. De stokastiska körtiderna har estimerats från tidigare insamlad hasighetsdata. Modeller för körtidernas och variansernas förändring under dagen har tagits fram. Syftet med examensarbetet var att föreslå en metod för hur påverkan på körtider av förutsägbar trafikträngsel i en urban trafikmiljö kan hanteras. Eftersom huvuddelen av alla leveranser sammanfaller med de tider på dygnet då trafikbelastning är som högst, ar är en effektiv och robust metod för att hantera sådana störningar av stor vikt. Det visas att den stokastiska modellen kommer att förflyttar ankomster från början och slutet av tidsfönstret till den mer okänsliga mittregionen. Tidigare, utförda leveranser studerades både med den ursprungliga deterministiska modellen och här framtagna stokastiska modellen. Skillnaden mellan de två analyserades genom att studera korrelationen mellan körtiderna som de beräknats av de två modellerna och de upmätta tiderna som de loggats av leveransfordonen. Det visas att korrelationen mellan körtiderna mellan de stokastiska körtiderna och de verkliga körtiderna är högre än korrelationen mellan de deterministiska körtiderna och de verkliga. Rutterna som föreslagits av den stokastiska modellen var också mer tlig mot störningar.
Subjects/Keywords: Vehicle routing problem; Stochastic travel times; Time dependent rive times; Time Windows.
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APA ·
Chicago ·
MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lundkvist, H. (2016). Robust Vehicle Routing in an Urban Setting. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-186248
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lundkvist, Henrik. “Robust Vehicle Routing in an Urban Setting.” 2016. Thesis, KTH. Accessed February 27, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-186248.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lundkvist, Henrik. “Robust Vehicle Routing in an Urban Setting.” 2016. Web. 27 Feb 2021.
Vancouver:
Lundkvist H. Robust Vehicle Routing in an Urban Setting. [Internet] [Thesis]. KTH; 2016. [cited 2021 Feb 27].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-186248.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lundkvist H. Robust Vehicle Routing in an Urban Setting. [Thesis]. KTH; 2016. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-186248
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
17.
Luo, Pei-Hao.
The study of fast-response 1-D and 2-D gratings based on blue phase liquid crystals.
Degree: Master, Physics, 2013, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0708113-012815
► In this study, we mainly discuss electro-optical characteristics of blue phase liquid crystals (BPLCs) gratings with different electric field profiles. There are two major parts…
(more)
▼ In this study, we mainly discuss electro-optical characteristics of blue phase liquid crystals (BPLCs) gratings with different electric field profiles. There are two major parts in this experiment:
The first part of the experiment, we use optical isotropic of BPLCs to discuss in vertical electric field whether BPLCs gratings of first-order diffraction efficiency vary. The results revealed that first-order diffraction efficiency didnât have extreme change (~1%), and first-order diffraction efficiency was reached up to 32% at Es=3.6 V/μm.
The second part of the experiment, we use polarization-
dependent of BPLCs in horizontal electric field, BPLCs sawtooth gratings switching one-dimension/two-dimension with different polarization of laser beam. One-dimension and two-dimension of first-order diffraction efficiency was reached up to 20.5% and 10.3% at V = 60, respectively.
The performance of the response
time, because BPLCs cell structure with good response speed. In two experiments, the response
time is sub-millisecond levels.
Advisors/Committee Members: Chia-Rong Lee (chair), Chie-Tong Kuo (committee member), Hsuan-Yu Huang (chair), Ming-Shan Tsai (chair), Shih-Hung Lin (chair).
Subjects/Keywords: gratings; blue phase liquid crystals; sawtooth; polarization-dependent; response time
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APA ·
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Manager
APA (6th Edition):
Luo, P. (2013). The study of fast-response 1-D and 2-D gratings based on blue phase liquid crystals. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0708113-012815
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Luo, Pei-Hao. “The study of fast-response 1-D and 2-D gratings based on blue phase liquid crystals.” 2013. Thesis, NSYSU. Accessed February 27, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0708113-012815.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Luo, Pei-Hao. “The study of fast-response 1-D and 2-D gratings based on blue phase liquid crystals.” 2013. Web. 27 Feb 2021.
Vancouver:
Luo P. The study of fast-response 1-D and 2-D gratings based on blue phase liquid crystals. [Internet] [Thesis]. NSYSU; 2013. [cited 2021 Feb 27].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0708113-012815.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Luo P. The study of fast-response 1-D and 2-D gratings based on blue phase liquid crystals. [Thesis]. NSYSU; 2013. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0708113-012815
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
18.
Fu, Hsu-sheng.
Direct Adaptive Control Synthesis for Uncertain Nonlinear Systems.
Degree: PhD, Mechanical and Electro-Mechanical Engineering, 2009, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0222109-124611
► The dissertation addresses direct adaptive control frameworks for Lyapunov stabilization of the MIMO nonlinear uncertain systems for both uncertain discrete-time and continuous-time systems. For system…
(more)
▼ The dissertation addresses direct adaptive control frameworks for Lyapunov stabilization of the MIMO nonlinear uncertain systems for both uncertain
discrete-
time and continuous-
time systems. For system theory, the development of continuous-
time theory always comes along with its discrete-
time counterpart. However, for direct adaptive control frameworks we find relative few Lyapunov-based results published, which is mainly due to difficulty to find feasible Lyapunov candidates and to prove negative definiteness of the Lyapunov difference.
Furthermore, digital computer is widely used in
all fields. Most of
time, we have to deal with the direct source of discrete-
time signals, even the discrete-
time signals arise from continuous-
time settings as results of measurement or data collection process. These motivate our study in this field.
For discrete-
time systems, we have investigated the results with trajectory
dependent hypothesis, where the Lyapunov candidate function V combines the information from the current state k and one step ahead k-1 along the track x(k), for k≥0. The proposed frameworks guarantee partial stability
of the closed-loop systems, such that the feedback gains stabilize the closed-loop system without the knowledge of the system parameters. In addition,
our results show that the adaptive feedback laws can be characterized by Kronecker calculus.
Later, we release this trajectory
dependent hypothesis
for normal discrete-
time nonlinear systems. At the same
time, the continuous-
time cases are also studied when system with matched disturbances, where the disturbances can be characterized by
known continuous function matrix and unknown parameters. Here, the trajectory
dependent Lyapunov candidates (tdLC), so long as the
time step
|t(k)-t(k-1) | ≤ δ and the corresponding track |x(k)-x(k-1)| ≤ ε are sufficiently small, only exist in discrete-
time case. In addition, we have extended the above control designs to systems with exogenous disturbances and
ι2 disturbances. Finally, we develop a robust direct adaptive control framework for linear uncertain
MIMO systems under the variance of unknow system matrix from given stable solution is bounded, that is |A-Ac| â¡ |B Kg| ≤ |ÎA|.
In general, through Lyapunov-based design we can obtain the global solutions and direct adaptive control design can simultaneously achieve parameter estimation and closed-loop stability.
Advisors/Committee Members: Chen-Wen Yen (chair), Chi-Cheng Cheng (committee member), Li-Chen Fu (chair), Teh-Lu Liao (chair), Yaw-Terng Su (chair).
Subjects/Keywords: trajectory dependent; Direct adaptive control; uncertain Nonlinear systems; discrete-time systems
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APA ·
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MLA ·
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CSE |
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Fu, H. (2009). Direct Adaptive Control Synthesis for Uncertain Nonlinear Systems. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0222109-124611
Chicago Manual of Style (16th Edition):
Fu, Hsu-sheng. “Direct Adaptive Control Synthesis for Uncertain Nonlinear Systems.” 2009. Doctoral Dissertation, NSYSU. Accessed February 27, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0222109-124611.
MLA Handbook (7th Edition):
Fu, Hsu-sheng. “Direct Adaptive Control Synthesis for Uncertain Nonlinear Systems.” 2009. Web. 27 Feb 2021.
Vancouver:
Fu H. Direct Adaptive Control Synthesis for Uncertain Nonlinear Systems. [Internet] [Doctoral dissertation]. NSYSU; 2009. [cited 2021 Feb 27].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0222109-124611.
Council of Science Editors:
Fu H. Direct Adaptive Control Synthesis for Uncertain Nonlinear Systems. [Doctoral Dissertation]. NSYSU; 2009. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0222109-124611
NSYSU
19.
Xie, Bor-Dun.
Kicked-Rotor under the Aharonov-Bohm Effect.
Degree: Master, Physics, 2012, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0801112-213804
► The kicked-rotor under the Aharonov-Bohm effect are studyed by using the floquet map, the energy change with different magnetic flux have also being discussed. Finally,…
(more)
▼ The kicked-rotor under the Aharonov-Bohm effect are studyed by using the floquet map, the energy change with different magnetic flux have also being discussed. Finally, the kicked-rotor under the
time-
dependent magnetic flux are discussed.
Advisors/Committee Members: De-Hone Lin (committee member), Yueh-Nan Chen (chair), Pi -Gang Luan (chair), Chung-Hsien Chou (chair), Wang-Chuang Kuo (chair).
Subjects/Keywords: Aharonov-Bohm Effect; floquet map; Kicked-Rotor; time-dependent magnetic flux
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Manager
APA (6th Edition):
Xie, B. (2012). Kicked-Rotor under the Aharonov-Bohm Effect. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0801112-213804
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Xie, Bor-Dun. “Kicked-Rotor under the Aharonov-Bohm Effect.” 2012. Thesis, NSYSU. Accessed February 27, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0801112-213804.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Xie, Bor-Dun. “Kicked-Rotor under the Aharonov-Bohm Effect.” 2012. Web. 27 Feb 2021.
Vancouver:
Xie B. Kicked-Rotor under the Aharonov-Bohm Effect. [Internet] [Thesis]. NSYSU; 2012. [cited 2021 Feb 27].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0801112-213804.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Xie B. Kicked-Rotor under the Aharonov-Bohm Effect. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0801112-213804
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
20.
Singh, Pragati.
Time-dependent damage based tension stiffening in reinforced concrete.
Degree: 2013, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/18093
► Deflection control is an important criterion for design of reinforced concrete structures. Deflection control becomes critical for lightly reinforced members. Behavior of concrete members at…
(more)
▼ Deflection control is an important criterion for design of reinforced concrete structures. Deflection control becomes critical for lightly reinforced members. Behavior of concrete members at service load levels involves complex interactions of cracking, creep, shrinkage and bond between concrete and embedded reinforcing bars. The creep and shrinkage phenomena are well established but the deterioration of tension stiffening with
time is not fully understood. Current tension stiffening models consider short term effects of cracking. The primary focus of this research is to examine the effect of
time on tension stiffening.
An analytical model is developed to examine the
time-
dependent effects of creep, shrinkage and bond on tension stiffening. The model is evaluated by comparison with the available experimental data. The sensitivity of the model to various parameters is examined through parametric study. The results of the research can be extended to flexural members for incorporation in design.
Advisors/Committee Members: Andrew Scanlon, Thesis Advisor/Co-Advisor.
Subjects/Keywords: Cracking; Tension Stiffening; Time-dependent deformation; Creep; Shrinkage; Reinforced Concrete.
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Manager
APA (6th Edition):
Singh, P. (2013). Time-dependent damage based tension stiffening in reinforced concrete. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/18093
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Singh, Pragati. “Time-dependent damage based tension stiffening in reinforced concrete.” 2013. Thesis, Penn State University. Accessed February 27, 2021.
https://submit-etda.libraries.psu.edu/catalog/18093.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Singh, Pragati. “Time-dependent damage based tension stiffening in reinforced concrete.” 2013. Web. 27 Feb 2021.
Vancouver:
Singh P. Time-dependent damage based tension stiffening in reinforced concrete. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Feb 27].
Available from: https://submit-etda.libraries.psu.edu/catalog/18093.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Singh P. Time-dependent damage based tension stiffening in reinforced concrete. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/18093
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Newcastle
21.
Fathi Salmi, Ebrahim.
A numerical investigation of the mechanisms of post-mining subsidence.
Degree: PhD, 2016, University of Newcastle
URL: http://hdl.handle.net/1959.13/1335396
► Research Doctorate - Doctor of Philosophy (PhD)
Subsidence is one of the most challenging and controversial problems in rock mechanics and geotechnical engineering. In particular,…
(more)
▼ Research Doctorate - Doctor of Philosophy (PhD)
Subsidence is one of the most challenging and controversial problems in rock mechanics and geotechnical engineering. In particular, the expansion of urbanised areas over abandoned mining excavations has brought about several questions concerning the long term stability of such excavations and the duration of the subsidence development. This study, therefore, aims to investigate the mechanisms of post mining subsidence. The role of the effective factors on the mechanisms of excavation induced ground movements are assessed through some case studies of actual subsidence incidents. Clearly, one of the fundamental stages of conducting numerical or theoretical analyses for calculating the magnitudes of subsidence is to reliably estimate the mechanical parameters of rock masses. A simple and practical approach is developed in this study, based on the concept of rock mass classification methods to approximate the rock mass parameters. Additionally, the mechanisms of mining induced subsidence in sloping terrain are investigated through numerical modelling. An interesting example of mining beneath escarpments in New South Wales, Australia, is investigated to capture the effects of the surface topography on the mechanisms of subsidence. Furthermore, the role of the gradual deterioration of a rock mass on the duration of the subsidence development in shallow abandoned coal mines is investigated. The conventional Tributary Area Method (TAM) is augmented to incorporate the effects of the gradual deterioration on the loads of pillars. Moreover, the conventional pillar strength methods are modified to take into account the effects of the gradual deterioration. The combination of these two approaches provides a suitable ground for assessing the life times of pillars. Furthermore, a simple and practical approach is proposed to take into account the role of gradual deterioration in the numerical modelling. The proposed approach is then employed for assessing the formation of subsidence over an abandoned shallow coal mine around the village of Dolphingstone, UK. The outcomes of the numerical modelling are then verified against the results of the empirical methods for estimating the stand up time of room and pillar mining excavations. Creep is the other time dependent behaviour of rocks, controlling the long term stability of excavations. The role of this factor on the mechanisms of post mining subsidence is also investigated in this study. The theories of visco elasticity and visco plasticity are employed in the frameworks of the analytical and numerical modelling to study the effects of creep on the gradual development of subsidence over abandoned room and pillar mines. The outcomes of the study show that creep plays a pronounced role on the values of the time dependent displacements over mining excavations. Moreover, a procedure is developed to take into account the effects of gradual weakening due to mechanical factors (e.g., creep) or environmental factors (e.g., weathering and…
Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering.
Subjects/Keywords: mining subsidence; time-dependent behaviour; numerical modelling; gradual deterioration
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APA ·
Chicago ·
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Export
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Manager
APA (6th Edition):
Fathi Salmi, E. (2016). A numerical investigation of the mechanisms of post-mining subsidence. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1335396
Chicago Manual of Style (16th Edition):
Fathi Salmi, Ebrahim. “A numerical investigation of the mechanisms of post-mining subsidence.” 2016. Doctoral Dissertation, University of Newcastle. Accessed February 27, 2021.
http://hdl.handle.net/1959.13/1335396.
MLA Handbook (7th Edition):
Fathi Salmi, Ebrahim. “A numerical investigation of the mechanisms of post-mining subsidence.” 2016. Web. 27 Feb 2021.
Vancouver:
Fathi Salmi E. A numerical investigation of the mechanisms of post-mining subsidence. [Internet] [Doctoral dissertation]. University of Newcastle; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1959.13/1335396.
Council of Science Editors:
Fathi Salmi E. A numerical investigation of the mechanisms of post-mining subsidence. [Doctoral Dissertation]. University of Newcastle; 2016. Available from: http://hdl.handle.net/1959.13/1335396
Iowa State University
22.
Patra, Srijita.
Effects of electrical, thermal and thermal gradient stress on reliability of metal interconnects.
Degree: 2014, Iowa State University
URL: https://lib.dr.iastate.edu/etd/14054
► This thesis focuses on the reliability modeling of metal interconnects under time-dependent stress. Whereas most existing reliability models are based upon the assumption that stress…
(more)
▼ This thesis focuses on the reliability modeling of metal interconnects under time-dependent stress. Whereas most existing reliability models are based upon the assumption that stress is constant throughout the useful life of a system, this thesis considers the more general and more realistic situation where the stress is time-dependent. In this work the stress is defined by temperature and current density variables. It is assumed that the Cumulative Density Function (CDF) is characterized by a single stress parameter that incorporates all stress-dependent variables. A closed-form expression that can be used to calculate the CDF under time-varying stress is presented and this can be used to determine the corresponding Median Time to Failure (MTF). A single parameter which can be represented as a real number is used to incorporate the total effects of the stress history making this approach applicable for dynamic power/thermal management algorithms.
A reliability model that includes the effects of thermal gradient stress in the presence of temperature and current stress is also introduced. With these models, temperature measurement accuracy requirements are developed that are necessary if power/thermal management circuits are to be successful in achieving 10% accuracy in the MTF. Incorporation of a time-dependent stress model that incorporates the user-dependent electrical and thermal stress history in the power/thermal management module of a large integrated circuit offers potential for significantly improving system performance while maintaining a target reliability throughout the operating life of the integrated circuit or for improving the reliability when operated at a user-determined stress level.
Subjects/Keywords: Electromigration; Reliability; Thermal gradient; Time dependent stress; Electrical and Electronics
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APA (6th Edition):
Patra, S. (2014). Effects of electrical, thermal and thermal gradient stress on reliability of metal interconnects. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/14054
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Patra, Srijita. “Effects of electrical, thermal and thermal gradient stress on reliability of metal interconnects.” 2014. Thesis, Iowa State University. Accessed February 27, 2021.
https://lib.dr.iastate.edu/etd/14054.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Patra, Srijita. “Effects of electrical, thermal and thermal gradient stress on reliability of metal interconnects.” 2014. Web. 27 Feb 2021.
Vancouver:
Patra S. Effects of electrical, thermal and thermal gradient stress on reliability of metal interconnects. [Internet] [Thesis]. Iowa State University; 2014. [cited 2021 Feb 27].
Available from: https://lib.dr.iastate.edu/etd/14054.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Patra S. Effects of electrical, thermal and thermal gradient stress on reliability of metal interconnects. [Thesis]. Iowa State University; 2014. Available from: https://lib.dr.iastate.edu/etd/14054
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
23.
Fu, Jin.
Accelerated Algorithms for Stochastic Simulation of Chemically Reacting Systems.
Degree: 2014, University of California – eScholarship, University of California
URL: http://www.escholarship.org/uc/item/0p40b9c5
► Stochastic models are widely used in the simulation of biochemical systems at a cellular level. For well mixed models, the system state can be represented…
(more)
▼ Stochastic models are widely used in the simulation of biochemical systems at a cellular level. For well mixed models, the system state can be represented by the population of each species. The probabilities for the system to be in each state are governed by the Chemical Master Equation (CME), which is generally a huge ordinary differential equation (ODE) system. The cost of solving the CME directly is generally prohibitive, due to its huge size.The Stochastic Simulation Algorithm (SSA) provides a kinetic Monte Carlo approach to obtain the solution to the CME. It does this by simulating every reaction event in the system. A great many stochastic realizations must be performed, to obtain accurate probabilities for the states. The SSA can generate a highly accurate result, however the computation of many SSA realizations may be expensive if there are many reaction events. Tau-leaping is an approximate algorithm that can speed up the simulation for many systems. It advances the system with a selected stepsize. In each step, it directly samples the number of reaction events in each reaction channel, which yields a faster simulation than SSA. The error in tau-leaping is controlled by selecting the stepsize properly.We have developed a new, accelerated tau-leaping algorithm for discrete stochastic simulation that make use of the fact that exact (time-dependent) solutions are known for some of the most common reaction motifs (subgraphs of the network of chemical species and reactants). This idea can be extended to spatial stochastic simulation, by treating the diffusion network as a special motif for which there is an exact time dependent solution. We describe the well-mixed and spatial stochastic time dependent solution algorithms, along with numerical experiments illustrating their effectiveness.
Subjects/Keywords: Computer science; diffusion-reaction; stochastic simulation; time dependent
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APA (6th Edition):
Fu, J. (2014). Accelerated Algorithms for Stochastic Simulation of Chemically Reacting Systems. (Thesis). University of California – eScholarship, University of California. Retrieved from http://www.escholarship.org/uc/item/0p40b9c5
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Fu, Jin. “Accelerated Algorithms for Stochastic Simulation of Chemically Reacting Systems.” 2014. Thesis, University of California – eScholarship, University of California. Accessed February 27, 2021.
http://www.escholarship.org/uc/item/0p40b9c5.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fu, Jin. “Accelerated Algorithms for Stochastic Simulation of Chemically Reacting Systems.” 2014. Web. 27 Feb 2021.
Vancouver:
Fu J. Accelerated Algorithms for Stochastic Simulation of Chemically Reacting Systems. [Internet] [Thesis]. University of California – eScholarship, University of California; 2014. [cited 2021 Feb 27].
Available from: http://www.escholarship.org/uc/item/0p40b9c5.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fu J. Accelerated Algorithms for Stochastic Simulation of Chemically Reacting Systems. [Thesis]. University of California – eScholarship, University of California; 2014. Available from: http://www.escholarship.org/uc/item/0p40b9c5
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Freie Universität Berlin
24.
Khosravi, Elham.
Zeitabhängige Phänomene in Quanten-Transport.
Degree: 2013, Freie Universität Berlin
URL: http://dx.doi.org/10.17169/refubium-13405
► Der Standardansatz für Quantentransport vereint den Landauer-Büttiker Formalismus mit der Grundzustands-Dichtefunktionaltheorie (DFT). Die Grundannahme hierbei ist, dass bei konstanter Spannung letztendlich ein zeitunabhängiger Zustand (steady…
(more)
▼ Der Standardansatz für Quantentransport vereint den Landauer-Büttiker
Formalismus mit der Grundzustands-Dichtefunktionaltheorie (DFT). Die
Grundannahme hierbei ist, dass bei konstanter Spannung letztendlich ein
zeitunabhängiger Zustand (steady state) erreicht wird. Wir werden hier
aufzeigen, dass diese Annahme im Allgemeinen nicht gültig ist, und einige
Beispiele geben, bei denen innerhalb verschiedener Näherungen kein
zeitunabhängiger Zustand erreicht wird. In diesen Fällen ist eine explizit
zeitabhängige Beschreibung des Elektronentransports notwendig. Hierzu vewenden
wir die zeitabhängige Dichtefunktionaltheorie (TDDFT) sowie die Vielteilchen-
Störungstheorie (MBPT). Für den nicht-wechselwirkenden Fall zeigen wir
analytisch und numerisch, dass das Vorhandensein von gebundenen Zuständen
anhaltende und lokalisierte Stromoszillationen hervorruft. Diese können
deutlich grösser als der stationäre Anteil des Stromes sein. Es zeigt sich,
dass der Beitrag der gebundenen Zustände zur zeitlich gemittelten Dichte vom
zeitlichen Ablauf abhängt und eine elementare Definition der dynamischen
Besetzungszahlen von gebundenen Zuständen ermöglicht. Im Falle von
Elektronentransport durch wechselwirkende Nanokontakte mit angelegter Spannung
führt die Unstetigkeit des Austauschkorrelationspotentials der DFT zu einem
dynamischen Zustand, welcher durch korrelationsinduzierte Oszillationen im
Regime der Coulomb-Blockade charakterisiert wird. Zusätzlich kann die
zeitabhängige Methode bei multistabilen Systemen beschreiben, ob und wie man
reversibel zwischen verschiedenen stabilen Lösungen der stationären
Zustandsgleichung wechseln kann, indem man eine passende zeitabhängige Gate-
Spannung anlegt. Die numerischen Berechnungen in diesem Regime zeigen, dass
eine zeit- und ortslokale Näherung für das Austausch-Korrelations-Potential
der TDDFT zu ungedämpften Oszillationen im Strom führt, selbst wenn eigentlich
ein stationärer Zustand erwartet wird. Ausserdem befassen wir uns mit dem
grundsätzlichen Problem, ob das Bistabilitätsphänomen fortbesteht, wenn man
dynamische Austausch-Korrelations-Eff ekte in Betracht zieht. Wir vergleichen
unsere Ergebnisse der TDDFT und MBPT eines Modellsystems mit denen aus der
Methode der zeitabhängigen Dichtematrix Renormalisierungsgruppe. Wir bekommen
dadurch Einblicke in die Leistungsfähigkeit der verschiedenen in dieser Arbeit
verwendeten Näherungen
Advisors/Committee Members: w (gender), Prof. Dr. E. K. U. Gross (firstReferee), Prof. Dr. F. von Oppen (furtherReferee).
Subjects/Keywords: Time-Dependent Transport; Quantum Transport; 500 Naturwissenschaften und Mathematik::530 Physik
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APA ·
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to Zotero / EndNote / Reference
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APA (6th Edition):
Khosravi, E. (2013). Zeitabhängige Phänomene in Quanten-Transport. (Thesis). Freie Universität Berlin. Retrieved from http://dx.doi.org/10.17169/refubium-13405
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Khosravi, Elham. “Zeitabhängige Phänomene in Quanten-Transport.” 2013. Thesis, Freie Universität Berlin. Accessed February 27, 2021.
http://dx.doi.org/10.17169/refubium-13405.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Khosravi, Elham. “Zeitabhängige Phänomene in Quanten-Transport.” 2013. Web. 27 Feb 2021.
Vancouver:
Khosravi E. Zeitabhängige Phänomene in Quanten-Transport. [Internet] [Thesis]. Freie Universität Berlin; 2013. [cited 2021 Feb 27].
Available from: http://dx.doi.org/10.17169/refubium-13405.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Khosravi E. Zeitabhängige Phänomene in Quanten-Transport. [Thesis]. Freie Universität Berlin; 2013. Available from: http://dx.doi.org/10.17169/refubium-13405
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Washington
25.
Goings, Joshua James.
Breaking symmetry in time-dependent electronic structure theory to describe spectroscopic properties of non-collinear and chiral molecules.
Degree: PhD, 2017, University of Washington
URL: http://hdl.handle.net/1773/39985
► Time-dependent electronic structure theory has the power to predict and probe the ways electron dynamics leads to useful phenomena and spectroscopic data. Here we report…
(more)
▼ Time-
dependent electronic structure theory has the power to predict and probe the ways electron dynamics leads to useful phenomena and spectroscopic data. Here we report several advances and extensions of broken-symmetry
time-
dependent electronic structure theory in order to capture the flexibility required to describe non-equilibrium spin dynamics, as well as electron dynamics for chiroptical properties and vibrational effects. In the first half, we begin by discussing the generalization of self-consistent field methods to the so-called two-component structure in order to capture non-collinear spin states. This means that individual electrons are allowed to take a superposition of spin-1/2 projection states, instead of being constrained to either spin-up or spin-down. The system is no longer a spin eigenfunction, and is known a a spin-symmetry broken wave function. This flexibility to break spin symmetry may lead to variational instabilities in the approximate wave function, and we discuss how these may be overcome. With a stable non-collinear wave function in hand, we then discuss how to obtain electronic excited states from the non-collinear reference, along with associated challenges in their physical interpretation. Finally, we extend the two-component methods to relativistic Hamiltonians, which is the proper setting for describing spin-orbit driven phenomena. We describe the first implementation of the explicit
time propagation of relativistic two-component methods and how this may be used to capture spin-forbidden states in electronic absorption spectra. In the second half, we describe the extension of explicitly
time-propagated wave functions to the simulation of chiroptical properties, namely circular dichroism (CD) spectra of chiral molecules. Natural circular dichroism, that is, CD in the absence of magnetic fields, originates in the broken parity symmetry of chiral molecules. This proves to be an efficient method for computing circular dichroism spectra for high density-of-states chiral molecules. Next, we explore the impact of allowing nuclear motion on electronic absorption spectra within the context of mixed quantum-classical dynamics. We show that nuclear motion modulates the electronic response, and this gives rise to infrared absorption as well as Raman scattering phenomena in the computed dynamic polarizability. Finally, we explore the accuracy of several perturbative approximations to the equation-of-motion coupled-cluster methods for the efficient and accurate prediction of electronic absorption spectra.
Advisors/Committee Members: Li, Xiaosong (advisor).
Subjects/Keywords: chiroptical; magnetism; non-collinear; spectroscopy; theoretical; time-dependent; Physical chemistry; Chemistry
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APA ·
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MLA ·
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Manager
APA (6th Edition):
Goings, J. J. (2017). Breaking symmetry in time-dependent electronic structure theory to describe spectroscopic properties of non-collinear and chiral molecules. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/39985
Chicago Manual of Style (16th Edition):
Goings, Joshua James. “Breaking symmetry in time-dependent electronic structure theory to describe spectroscopic properties of non-collinear and chiral molecules.” 2017. Doctoral Dissertation, University of Washington. Accessed February 27, 2021.
http://hdl.handle.net/1773/39985.
MLA Handbook (7th Edition):
Goings, Joshua James. “Breaking symmetry in time-dependent electronic structure theory to describe spectroscopic properties of non-collinear and chiral molecules.” 2017. Web. 27 Feb 2021.
Vancouver:
Goings JJ. Breaking symmetry in time-dependent electronic structure theory to describe spectroscopic properties of non-collinear and chiral molecules. [Internet] [Doctoral dissertation]. University of Washington; 2017. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1773/39985.
Council of Science Editors:
Goings JJ. Breaking symmetry in time-dependent electronic structure theory to describe spectroscopic properties of non-collinear and chiral molecules. [Doctoral Dissertation]. University of Washington; 2017. Available from: http://hdl.handle.net/1773/39985
Delft University of Technology
26.
Willebrands, Okke (author).
Differential Vertical Shortening in Timber-Concrete High-rise Structures.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:7c3367c2-8700-4704-b913-bf0e957ab5b4
► Differential vertical shortening (DVS) is the relative vertical shortening between two adjacent vertical load bearing elements. DVS originates because axial loading conditions on- and the…
(more)
▼ Differential vertical shortening (DVS) is the relative vertical shortening between two adjacent vertical load bearing elements. DVS originates because axial loading conditions on- and the design of adjacent vertical load bearing elements are different. Due to these differences, the reaction of the adjacent vertical structural elements expressed as length change can be different. The aim of this thesis is to research differential vertical shortening effects in high-rise buildings that use a concrete core as a lateral stability system and a timber pendulum structure as a gravitational system. The Tallwood House in Brock Commons is a perfect example of such a structural system where the engineers have considered the shortening effects which will be reviewed in this research. Furthermore, this research will look for measures in the design and implementation phase that have influence on the magnitude of differential vertical shortening deformations. In the Tallwood House project the problem was only tackled on basis of the individual column shortening and the effect it would have on vertical mechanical systems. A clear understanding of the relative difference between core and column shortening (DVS) and the effect it can have on secondary building systems is lacking. The determination of criteria on which the DVS deformations are assessed in the Brock Commons building, are based on the deformation capacity of the vertical mechanical systems, which does not necessarily relate to the DVS deformations. A more methodological approach is necessary for the prediction of DVS deformations and the determination of criteria regarding DVS deformations. The sub question have the aim to reach to a more general and methodological approach in predicting DVS deformations and determining criteria for DVS deformations. “What are the criteria on which differential vertical shortening deformations in the building structure should be assessed in order to guarantee the functional performance of the building during its service life?” “How can differential vertical shortening deformations be quantified for a timber-concrete high-rise structure?” After answering the sub-questions that relate to the criteria on DVS deformations and the quantification of DVS deformations, a research can be conducted to the influence of some input variables for the design and construction process to answer the main question of this research: “What are effective measures which can be applied in the design and construction phase to mitigate the differential vertical shortening during the service life of high-rise buildings that uses a timber gravitational load bearing system with stabilizing concrete cores?’’ Problem areas where DVS deformations can have a negative effect on secondary building structures are researched. A general approach for the determination of criteria for DVS deformations is elaborated, based on principles for vertical deformation criteria that are described by the…
Advisors/Committee Members: van de Kuilen, Jan-Willem (mentor), Ravenshorst, Geert (graduation committee), Terwel, Karel (graduation committee), Lagendijk, Paul (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Timber; Concrete; high-rise buildings; Differential vertical shortening; Time dependent deformations
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APA (6th Edition):
Willebrands, O. (. (2017). Differential Vertical Shortening in Timber-Concrete High-rise Structures. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:7c3367c2-8700-4704-b913-bf0e957ab5b4
Chicago Manual of Style (16th Edition):
Willebrands, Okke (author). “Differential Vertical Shortening in Timber-Concrete High-rise Structures.” 2017. Masters Thesis, Delft University of Technology. Accessed February 27, 2021.
http://resolver.tudelft.nl/uuid:7c3367c2-8700-4704-b913-bf0e957ab5b4.
MLA Handbook (7th Edition):
Willebrands, Okke (author). “Differential Vertical Shortening in Timber-Concrete High-rise Structures.” 2017. Web. 27 Feb 2021.
Vancouver:
Willebrands O(. Differential Vertical Shortening in Timber-Concrete High-rise Structures. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Feb 27].
Available from: http://resolver.tudelft.nl/uuid:7c3367c2-8700-4704-b913-bf0e957ab5b4.
Council of Science Editors:
Willebrands O(. Differential Vertical Shortening in Timber-Concrete High-rise Structures. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:7c3367c2-8700-4704-b913-bf0e957ab5b4
Delft University of Technology
27.
Chen, Z. (author).
Using time-dependent route choice model to analyze the profitability of multimodal transport in flower industry: From the perspective of buyers of the FloraHolland.
Degree: 2015, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:be088199-9fae-46dc-96f5-d0018a4ce890
► The title of my master thesis is “Using time-dependent route choice model to analyze the profitability of multimodal transport in flower industry – From the…
(more)
▼ The title of my master thesis is “Using time-dependent route choice model to analyze the profitability of multimodal transport in flower industry – From the perspective of buyers of the FloraHolland”. The report aims to analyze the profitability of cut flower transport using multimodal transport in short/medium-distance by building a time-dependent route choice model to choose an optimal route between the origin and the destination by comparing the route costs of multimodal and unimodal transport from the perspective of buyers of the FloraHolland Company. The first chapter introduces what and how the report is going to research the topic based on relevant studies having been done. The second chapter illustrates the background of the flower industry, including the introduction of different species of cut flower, the supply chain of rose of the cut flower and analysis of stakeholders of transport section of the supply chain. The problem statement, research objective, scope and research approach are demonstrated in chapter three. The report reviews the literature in freight planning, route choice approach, static and dynamic traffic models in chapter four. Time-dependent model is constructed in the fifth chapter, and the computational process of Matlab software is explained. Chapter six is a case study of the model. The input data of the case come from references, interviewing with stakeholders, Google map, and assumptions. Sensitivity analysis of constants is applied for validation. In the following analysis of the results of the case, the influences of factors of the model are analyzed. Then, an ideal scenario for multimodal is concluded from previous analyzes. The choice of departure time at the origin results in different schedule delay costs and different congestion level on the highway. Then, transport time of one route from the origin to the destination is changing with departure time. In the cost function of the model, transport time is an important variable.Thus, the choice of optimal route from the origin to the destination is changing with the choice of departure time. This deduction is simulated and analyzed in the case study. In the preliminary results of the case study, the time-dependent optimal routes are mainly in unimodal transport. The routes in multimodal transport can be the optimal choice when stakeholders introduce policies benefit to main modes of multimodal transport. In the conclusion of the report, multimodal transport is not more beneficial than unimodal transport for buyers from the initial results of the model which represents the current situation. However, multimodal transport can be profitability in flower industry from the perspective of buyers of the FloraHolland Company if the stakeholders formulate policies beneficial to multimodal transport.
Transport, Infrastructure and Logistics
Maritime & Transport Technology
Mechanical, Maritime and Materials Engineering
Advisors/Committee Members: Lodewijks, G. (mentor), Corman, F. (mentor), Zhang, M. (mentor), Pel, A.J. (mentor).
Subjects/Keywords: multimodal and unimodal transport; time-dependent route choice model; flower industry
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APA ·
Chicago ·
MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, Z. (. (2015). Using time-dependent route choice model to analyze the profitability of multimodal transport in flower industry: From the perspective of buyers of the FloraHolland. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:be088199-9fae-46dc-96f5-d0018a4ce890
Chicago Manual of Style (16th Edition):
Chen, Z (author). “Using time-dependent route choice model to analyze the profitability of multimodal transport in flower industry: From the perspective of buyers of the FloraHolland.” 2015. Masters Thesis, Delft University of Technology. Accessed February 27, 2021.
http://resolver.tudelft.nl/uuid:be088199-9fae-46dc-96f5-d0018a4ce890.
MLA Handbook (7th Edition):
Chen, Z (author). “Using time-dependent route choice model to analyze the profitability of multimodal transport in flower industry: From the perspective of buyers of the FloraHolland.” 2015. Web. 27 Feb 2021.
Vancouver:
Chen Z(. Using time-dependent route choice model to analyze the profitability of multimodal transport in flower industry: From the perspective of buyers of the FloraHolland. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Feb 27].
Available from: http://resolver.tudelft.nl/uuid:be088199-9fae-46dc-96f5-d0018a4ce890.
Council of Science Editors:
Chen Z(. Using time-dependent route choice model to analyze the profitability of multimodal transport in flower industry: From the perspective of buyers of the FloraHolland. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:be088199-9fae-46dc-96f5-d0018a4ce890
University of Arizona
28.
Bates, Melissa Elizabeth.
Forensic Rockfall Dating at Kartchner Caverns
.
Degree: 2018, University of Arizona
URL: http://hdl.handle.net/10150/628063
► This study discusses the time dependent nature of geomechanics and explores low-impact methods for dating rockfalls in the cave environment. Kartchner Caverns provides a unique…
(more)
▼ This study discusses the
time dependent nature of geomechanics and explores low-impact methods for dating rockfalls in the cave environment. Kartchner Caverns provides a unique environment to perform this study because of its high humidity, absence of sunlight, gently fluctuating temperature, and seclusion from the above ground surface which causes the cave to be inhabited by specific types microorganisms. High precision microscopy and microbial DNA extraction were used in order to better understand the changes that rock surfaces undergo when they are exposed to the cave environment. Spectral data collection was done in order to research the applicability of remote sensing technology to assess the degree of weathering of rock surfaces at the project site. It was concluded that microbiology and chemical processes may play an important role in weathering in the cave environment and spectral imaging has the potential to be an effective data collection method.
Advisors/Committee Members: Kemeny, John (advisor), Barton, Isabel (committeemember), Momayez, Moe (committeemember).
Subjects/Keywords: cave;
geomechanics;
Kartchner Caverns;
remote sensing;
time dependent;
weathering
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APA (6th Edition):
Bates, M. E. (2018). Forensic Rockfall Dating at Kartchner Caverns
. (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/628063
Chicago Manual of Style (16th Edition):
Bates, Melissa Elizabeth. “Forensic Rockfall Dating at Kartchner Caverns
.” 2018. Masters Thesis, University of Arizona. Accessed February 27, 2021.
http://hdl.handle.net/10150/628063.
MLA Handbook (7th Edition):
Bates, Melissa Elizabeth. “Forensic Rockfall Dating at Kartchner Caverns
.” 2018. Web. 27 Feb 2021.
Vancouver:
Bates ME. Forensic Rockfall Dating at Kartchner Caverns
. [Internet] [Masters thesis]. University of Arizona; 2018. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10150/628063.
Council of Science Editors:
Bates ME. Forensic Rockfall Dating at Kartchner Caverns
. [Masters Thesis]. University of Arizona; 2018. Available from: http://hdl.handle.net/10150/628063
University of Tennessee – Knoxville
29.
Sundahl, Bryan Edman.
Time Dependent Density-Functional Theory - Linear Response.
Degree: MS, Chemistry, 2013, University of Tennessee – Knoxville
URL: https://trace.tennessee.edu/utk_gradthes/2644
► The formal derivation of the linear response of time-dependent density-functional theory as shown by E. K. U. Gross is presented. The transformation of formal…
(more)
▼ The formal derivation of the linear response of
time-
dependent density-functional theory as shown by E. K. U. Gross is presented. The transformation of formal theory to the working linear response equations in the form of Casida's eigenvalue equation is demonstrated, and the results are applied to small monatomic, diatomic and triatomic systems. The application of different operators to the perturbed density is discussed, with the most attention being given to the dynamic polarizabilities. The dynamic polarizabilities and excitation spectra for N
2 [nitrogen gas] are then analyzed. The first excitation energy is noted to be in line with Koopmans' theorem. Finally three orbital localization algorithms and their implementation are detailed, with comparisons between the one-sided and two-sided Jacobi implementations present. The performance of a serial and then a parallel algorithm are shown. The poor performance of parallel algorithm is explained.
Advisors/Committee Members: Jon P. Camden, Charles Feigerle, Robert J. Hinde.
Subjects/Keywords: electronic structure; linear response; time-dependent density-functional theory; Physical Chemistry
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APA (6th Edition):
Sundahl, B. E. (2013). Time Dependent Density-Functional Theory - Linear Response. (Thesis). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_gradthes/2644
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sundahl, Bryan Edman. “Time Dependent Density-Functional Theory - Linear Response.” 2013. Thesis, University of Tennessee – Knoxville. Accessed February 27, 2021.
https://trace.tennessee.edu/utk_gradthes/2644.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sundahl, Bryan Edman. “Time Dependent Density-Functional Theory - Linear Response.” 2013. Web. 27 Feb 2021.
Vancouver:
Sundahl BE. Time Dependent Density-Functional Theory - Linear Response. [Internet] [Thesis]. University of Tennessee – Knoxville; 2013. [cited 2021 Feb 27].
Available from: https://trace.tennessee.edu/utk_gradthes/2644.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sundahl BE. Time Dependent Density-Functional Theory - Linear Response. [Thesis]. University of Tennessee – Knoxville; 2013. Available from: https://trace.tennessee.edu/utk_gradthes/2644
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Laurentian University
30.
Saeidi, Negar.
Mine schedule optimization with geotechnical constraints
.
Degree: 2015, Laurentian University
URL: https://zone.biblio.laurentian.ca/dspace/handle/10219/2514
► If a mining project consists of n stoping activities these can be scheduled in n! ways according to the duration between the activities and their…
(more)
▼ If a mining project consists of n stoping activities these can be scheduled in n! ways according to
the duration between the activities and their precedence. Mine schedule optimization
manipulates the precedence relationships and the duration of the mining activities in order to
maximize the Net Present Value (NPV). However, unexpected instabilities may impede or
disrupt the schedule and thus reduce the profitability and so geotechnical aspects of the operation
need to be taken into account.
The mine schedule optimization software considered in this work is the so-called Schedule
Optimization Tool (SOT). This thesis reports the work for development of new geomechanical
constraints for any mine scheduling tool to find the safest and the most profitable schedule,
exemplified within the SOT framework.
The core hypothesis of this research is that there is a time-dependent aspect of the rock behaviour
that leads to instability, a consequence of dependence of geotechnical instability upon the
sequence and duration between stoping activities. There is evidence presented in this work that
supports this hypothesis.
An automated procedure for timely and computationally efficient calculations of the instability
metrics is presented. This can be applied to evaluate the geomechanical stability of any of the n!
schedules for excavating n stopes or applied to evaluate geomechanical stability of schedules
arising in the schedule optimization process. However, in practice, the number of feasible
schedules is much less than n! due to the precedence constraints. The approach starts with
computing n elastic stress fields induced after excavating each individual stope independently
within an identical computational domain using Compute3D. The stress-time series of each
iv
and/or every sequence of stoping are generated through superimposition of these pre-computed
stress fields, and the time stamps of blasting for excavation are allocated corresponding to the
stoping timetable. Different blasts are allowed to be timetabled at the same time. By means of
Hooke’s law and the 3D Kelvin-Voigt creep model the elastic strain time series and the
viscoelastic strain time series are produced for the stress-time series. Based on the Mohr-
Coulomb Failure criterion three (in)stability indicators are defined:
i. ‘Strength Factor’ to evaluate state of stress at each stage of each schedule as a proportion
of is strength
ii. ‘Strainth Factor’ to evaluate state of elastic strain at each stage of each schedule as a
proportion of a limiting ‘rupture’ strain
iii. ‘Viscoelastic-strainth Factor’ to evaluate state of viscoelastic strain at each stage of each
schedule as a proportion of a limiting ‘rupture’ strain.
To provide a perspective of the (in)stability condition in the computational domain for all the
feasible sequences of stoping, 12 (in)stability metrics were defined and the results of each are
illustrated in the form of ‘(in)stability indicator diagrams’. The overall methodology is applied
to an example of…
Subjects/Keywords: Mining schedule optimization;
geomechanical stability;
time-dependent rock deformability;
excavation sequencing
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Saeidi, N. (2015). Mine schedule optimization with geotechnical constraints
. (Thesis). Laurentian University. Retrieved from https://zone.biblio.laurentian.ca/dspace/handle/10219/2514
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Saeidi, Negar. “Mine schedule optimization with geotechnical constraints
.” 2015. Thesis, Laurentian University. Accessed February 27, 2021.
https://zone.biblio.laurentian.ca/dspace/handle/10219/2514.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Saeidi, Negar. “Mine schedule optimization with geotechnical constraints
.” 2015. Web. 27 Feb 2021.
Vancouver:
Saeidi N. Mine schedule optimization with geotechnical constraints
. [Internet] [Thesis]. Laurentian University; 2015. [cited 2021 Feb 27].
Available from: https://zone.biblio.laurentian.ca/dspace/handle/10219/2514.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Saeidi N. Mine schedule optimization with geotechnical constraints
. [Thesis]. Laurentian University; 2015. Available from: https://zone.biblio.laurentian.ca/dspace/handle/10219/2514
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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. 
Open Access Theses and Dissertations