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1.
Cristaldi, Giuseppe.
Sviluppo di materiali compositi rinforzati con fibre naturali per l'ingegneria civile.
Degree: 2012, Università degli Studi di Catania
URL: http://hdl.handle.net/10761/1258 
► Il presente lavoro di tesi si colloca all interno del settore di ricerca incentrato sullo studio di innovativi materiali compositi polimerici rinforzati con fibre naturali…
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▼ Il presente lavoro di tesi si colloca all interno del settore di ricerca incentrato sullo studio di innovativi materiali compositi polimerici rinforzati con fibre naturali di origine vegetale.
Lo studio di caratterizzazione meccanica è stato corredato da quello sui modelli previsionali del comportamento meccanico. Infatti, in campo ingegneristico, è indispensabile disporre di modelli fisici che permettono di stimare con adeguata accuratezza la proprietà meccaniche dei materiali da impiegare. Come già esposto nel capitolo 3, i convenzionali modelli previsionali (regola delle miscele) presenti in letteratura sono per lo più sviluppati ed offrono risultati attendibili solo per compositi con rinforzi di tipo unidirezionale e di fibre sintetiche, quindi in linea generale per materiali di natura omogenea (es. vetro resina). Pochi studi sono incentrati sui compositi rinforzati con tessuti tecnici bi- o multiassiali a base di fibre corte (mat) o yarn di fibre corte, soprattutto se di natura vegetale. Nel corso degli ultimi anni sono stati proposti alcuni modelli previsionali che permettono di apportare le opportune correzioni ai modelli classici della micromeccanica in relazione alle peculiarità dei tessuti di fibre vegetali. Considerando che la letteratura è scarna di pubblicazioni riguardo studi su tali modelli previsionali e non essendo possibile avere la certezza assoluta che essi si adattano al tipo di composito in esame, si è proceduto con lo studio e la validazione dei più significativi modelli con i compositi oggetto dello studio.
Considerando, inoltre, che un classico problema con i filati ritorti è il loro diverso comportamento meccanico, allo stato secco e reticolato all interno del composito, [68,89], si è pensato di finalizzare lo studio a sviluppare un approccio affidabile per determinare le proprietà del filato in modo da poterle usare direttamente nei modelli previsionali per ottenere sempre più risultati aderenti al comportamento.
In conclusione, ci si è posto l obiettivo di individuare un possibile campo di impiego e le eventuali limitazioni ai materiali studiati con l intento di analizzare gli aspetti positivi e negativi di natura ingegneristica.
Subjects/Keywords: Area 08 - Ingegneria civile e architettura; natural fiber, polymer composite, civil engineering
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APA (6th Edition):
Cristaldi, G. (2012). Sviluppo di materiali compositi rinforzati con fibre naturali per l'ingegneria civile. (Thesis). Università degli Studi di Catania. Retrieved from http://hdl.handle.net/10761/1258
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):
Cristaldi, Giuseppe. “Sviluppo di materiali compositi rinforzati con fibre naturali per l'ingegneria civile.” 2012. Thesis, Università degli Studi di Catania. Accessed September 19, 2019.
http://hdl.handle.net/10761/1258.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Cristaldi, Giuseppe. “Sviluppo di materiali compositi rinforzati con fibre naturali per l'ingegneria civile.” 2012. Web. 19 Sep 2019.
Vancouver:
Cristaldi G. Sviluppo di materiali compositi rinforzati con fibre naturali per l'ingegneria civile. [Internet] [Thesis]. Università degli Studi di Catania; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/10761/1258.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Cristaldi G. Sviluppo di materiali compositi rinforzati con fibre naturali per l'ingegneria civile. [Thesis]. Università degli Studi di Catania; 2012. Available from: http://hdl.handle.net/10761/1258
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
2.
Gonçalves, Marta.
Freguesia de Cernache do Bonjardim. Territorio y patrimonio.
Degree: 2011, RCAAP
URL: https://www.rcaap.pt/detail.jsp?id=oai:sapientia.ualg.pt:10400.1/10368
► Este trabajo tiene como área de estúdio la freguesia de Cernache do Bonjardim, situada en el concelho de Sertã, distrito de Castelo Branco, en el…
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▼ Este trabajo tiene como área de estúdio la freguesia de Cernache do Bonjardim, situada en el concelho de Sertã, distrito de Castelo Branco, en el centro de Portugal. Inserta en la zona verde más grande de Europa, la inmensidad espontânea de sus bosques de pino, invita a una fiesta de agua y sol com tranquilidad, calma y placer, donde las excursiones y deportes acuáticos se realizan sin prisa en los puntos de singularidad y belleza (VVAA, 2008). Com una superfície de 7 203 hectáreas y una población de alrededor de 4 000 habitantes, la freguesia de Cernache do Bonjardim, mezcla la ruralidad de sus lugares en el urbanismo del pueblo que es capital de la freguesia, siendo el segundo núcleo más importante del concelho. Es atravesada por los arroyos de Sertã y Cerdeira, dos de los arroyos más importantes del concelho (VVAA, 2008). Esta freguesia fue creada el 5 de enero de 1544, y fue elevado a pueblo el 20 de agosto de 1955 (VVAA, 2008). Fue considerada durante muchos años
el “pueblo más importante de Portugal” por ser lo más poblado. Al pasar a pueblo perdió el protagonismo que había tenido. Como la sede de la municipalidad, Cernache polariza y gira al su alrrededor una área importante e amplia socio-económico, donde hay una serie de equipos ya considerable, en particular, la gira de GNR (Guardia Nacional Republicana), corporación de Bomberos Voluntarios, Centro de Salud, Oficina de Correos y Telecomunicaciones, Seminario, Centro de Asistencia Social, Zona Industrial, Mercado Municipal, Parque de la Feria, campo de fútbol de césped, polideportivo, piscina cubierta, la radio local, escuela secundaria, jardines de infancia, sucursales bancarias, Campo de Tiro, farmacia y equipos industriales, comerciales, de restauración y servicios (VVAA, 2008).
Advisors/Committee Members: Perez Cano, María Teresa.
Subjects/Keywords: Planification urbanistica; Ingenieria civil; Historia local; Urbanismo; Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Civil
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APA (6th Edition):
Gonçalves, M. (2011). Freguesia de Cernache do Bonjardim. Territorio y patrimonio. (Thesis). RCAAP. Retrieved from https://www.rcaap.pt/detail.jsp?id=oai:sapientia.ualg.pt:10400.1/10368
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):
Gonçalves, Marta. “Freguesia de Cernache do Bonjardim. Territorio y patrimonio.” 2011. Thesis, RCAAP. Accessed September 19, 2019.
https://www.rcaap.pt/detail.jsp?id=oai:sapientia.ualg.pt:10400.1/10368.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gonçalves, Marta. “Freguesia de Cernache do Bonjardim. Territorio y patrimonio.” 2011. Web. 19 Sep 2019.
Vancouver:
Gonçalves M. Freguesia de Cernache do Bonjardim. Territorio y patrimonio. [Internet] [Thesis]. RCAAP; 2011. [cited 2019 Sep 19].
Available from: https://www.rcaap.pt/detail.jsp?id=oai:sapientia.ualg.pt:10400.1/10368.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gonçalves M. Freguesia de Cernache do Bonjardim. Territorio y patrimonio. [Thesis]. RCAAP; 2011. Available from: https://www.rcaap.pt/detail.jsp?id=oai:sapientia.ualg.pt:10400.1/10368
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
3.
Kolb, Stephanie Lang.
A preliminary evaluation of a speed threshold incident detection algorithm.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-K654
► Traffic management centers can reduce emergency vehicle response time to incidents with immediate detection of incidents. Traffic management centers detect incidents by applying speed, occupancy,…
(more)
▼ Traffic management centers can reduce emergency vehicle response time to incidents with immediate detection of incidents. Traffic management centers detect incidents by applying speed, occupancy, and/or volume loop detector data to an incident detection algorithm. San Antonio's new traffic management center, TransGuide, uses a new speed based algorithm, The TXDOT (Texas Department of Transportation) Speed algorithm. This research compares the TXDOT Speed algorithm with California algorithm #8 and California algorithm #8 using Fuzzy Logic to evaluate the new algorithm's effectiveness in detecting incidents on freeways. To test these algorithms, real data from TransGuide were run through the algorithms. Algorithm output were compared with CCTV (closed circuit television) recordings to determine how often the algorithms detected incidents, how long it takes them to detect incidents, and how frequently the algorithms falsely declared incidents. The results showed that the TXDOT algorithm performed best in detecting the most incidents and in producing the fewest false alarms, but it did not have the best detection times. However, the algorithms were not tested during many congestion periods. It is expected that the TXDOT Speed algorithm would produce numerous false alarms if it were tested during congestion. Recommendations were made to enhance the TXDOT Speed algorithm to improve its incident detection time and to allow it to perform well in congested areas.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Kolb, S. L. (2012). A preliminary evaluation of a speed threshold incident detection algorithm. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-K654
Chicago Manual of Style (16th Edition):
Kolb, Stephanie Lang. “A preliminary evaluation of a speed threshold incident detection algorithm.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-K654.
MLA Handbook (7th Edition):
Kolb, Stephanie Lang. “A preliminary evaluation of a speed threshold incident detection algorithm.” 2012. Web. 19 Sep 2019.
Vancouver:
Kolb SL. A preliminary evaluation of a speed threshold incident detection algorithm. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-K654.
Council of Science Editors:
Kolb SL. A preliminary evaluation of a speed threshold incident detection algorithm. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-K654
Texas A&M University
4.
Lehmann, Erwin August.
A procedure for automatically linking a geographical database and a pavement attribute database.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-L456
► Many municipalities have operational Pavement Management Systems (PMS) in one form or another. These municipalities desire the ability to access, manipulate, analyze, display, and report…
(more)
▼ Many municipalities have operational Pavement Management Systems (PMS) in one form or another. These municipalities desire the ability to access, manipulate, analyze, display, and report graphical information about their roadway networks. While most operational PMS packages display information in a tabular format, a Geographical Information System (GIS) displays information graphically. Therefore, linking a PMS attribute database to a GIS spatial database can improve and enhance its functionality. To achieve a link between a PMS attribute database and a GIS spatial database requires that the databases share a common unique identifier. This paper summarizes the efforts to identify a common unique identifier and to automatically link a PMS attribute database and a GIS spatial database. A four stage computer linking program, which was developed under this research, is described in this paper. The automated linking process will allow municipalities with established PMS to save time and money when developing an inhouse GIS link to their PMS.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Lehmann, E. A. (2012). A procedure for automatically linking a geographical database and a pavement attribute database. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-L456
Chicago Manual of Style (16th Edition):
Lehmann, Erwin August. “A procedure for automatically linking a geographical database and a pavement attribute database.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-L456.
MLA Handbook (7th Edition):
Lehmann, Erwin August. “A procedure for automatically linking a geographical database and a pavement attribute database.” 2012. Web. 19 Sep 2019.
Vancouver:
Lehmann EA. A procedure for automatically linking a geographical database and a pavement attribute database. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-L456.
Council of Science Editors:
Lehmann EA. A procedure for automatically linking a geographical database and a pavement attribute database. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-L456
Texas A&M University
5.
McArthur, Karl Edward.
Comparasion of finite difference and finite element hydrodynamic models applied to the Laguna Madre Estuary, Texas.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M322
► The U.S. Geological Survey Surface Water Flow and Transport Model in Two-Dimensions (SV*9FT2D) model was applied to the northern half of the Laguna Madre Estuary.…
(more)
▼ The U.S. Geological Survey Surface Water Flow and Transport Model in Two-Dimensions (SV*9FT2D) model was applied to the northern half of the Laguna Madre Estuary. SW=D is a two dimensional hydrodynamic and transport model for well-mixed estuaries, coastal embayments, harbors, lakes, rivers, and inland waterways. The model numerically solves finite difference forms of the vertically integrated equations of mass and momentum conservation in conjunction with transport equations for heat, salt, and constituent fluxes. The finite difference scheme in SW=D is based on a spatial discretization of the water body as a grid of equal sized, square cers. The model includes the effects of wetting and drying, wind, inflows and return flows, flow barriers, and hydraulic structures. The results of the SW=D model were compared to results from an application of the TXBLEND model by Texas Water Development Board to the same part of the estuary. TXBLEND is a two-dimensional hydrodynamic model based on the finite element method. 'Me model employs triangular elements with linear basis functions and solves the generalized wave continuity formulation of the shallow water equations. TXBLEND is an expanded version of the BLEND model to additional features that include the coupling of the density and momentum equations, the inclusion of evaporation and direct precipitation, and the addition tributary inflows. The TXBLEND model simulations discussed in this study were performed by personnel at the TWDB. The two models were calibrated to a June 1991 data set from a TWDB intensive inflow survey of the Laguna Madre. Velocity and water quality data were available for the three days of the survey. Tide data for a much longer period were available from TCOON network stations. Results of the two models were compared at seven tide stations, eight velocity stations, and eleven flow cross sections. Simulated water surface elevations, velocities, and circulation patterns were comparable between models. The models were also compared on the basis of the ease of application and the computational efficiencies of the two models. The results indicate that, in the case of the Laguna Madre Estuary, TXBLEND is the more efficient of the two models.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
McArthur, K. E. (2012). Comparasion of finite difference and finite element hydrodynamic models applied to the Laguna Madre Estuary, Texas. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M322
Chicago Manual of Style (16th Edition):
McArthur, Karl Edward. “Comparasion of finite difference and finite element hydrodynamic models applied to the Laguna Madre Estuary, Texas.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M322.
MLA Handbook (7th Edition):
McArthur, Karl Edward. “Comparasion of finite difference and finite element hydrodynamic models applied to the Laguna Madre Estuary, Texas.” 2012. Web. 19 Sep 2019.
Vancouver:
McArthur KE. Comparasion of finite difference and finite element hydrodynamic models applied to the Laguna Madre Estuary, Texas. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M322.
Council of Science Editors:
McArthur KE. Comparasion of finite difference and finite element hydrodynamic models applied to the Laguna Madre Estuary, Texas. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M322
Texas A&M University
6.
McCaleb, James Bradley.
Evaluation of alternative sign replacement strategies.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M324
► The Secretary of Transportation was directed by Congress, in the U.S. DOT Appropriations Act of 1992, to revise the manuel on Uniform traffic Control Devices…
(more)
▼ The Secretary of Transportation was directed by Congress, in the U.S. DOT Appropriations Act of 1992, to revise the manuel on Uniform traffic Control Devices (MUTCD) to include a standard for a minimum level of retroreflectivity that must be maintained for ....signs which apply to all roads open to public travel. The purpose for developing such values is to insure that signs maintain a level of performance related to the minimum visibility requirements of drivers. In 1993 the Federal Highway Administration (FHWA) proposed a framework containing minimum levels of retroreflectivity. The final minimum retroreflectivity values are expected to be included in the next edition of the (MUTCD). The proposed minimum retroreflectivity values are likely to be presented in the MUTCD as guidelines; however, once they have been established, the public will expect the Texas Department of Transportation (TXDOT) and other transportation agencies to follow them. The establishment of the final minimum retroreflectivity values and guidelines will have a significant impact on TXDOT. The objective of this thesis was to determine the most cost effective strategy for TXDOT to implement in replacing traffic signs that do not meet the expected minimum retroreflectivity values. This thesis includes a review of previous work on retroreflectivity and related subjects; interviews with TXDOT personnel; surveys of state traffic engineers, TXDOT district personnel and TXDOT sign crews-the collection and evaluation of sign retroreflectivity data in Texas; an economic analysis of alternative sign replacement strategies; and a sensitivity analysis of key variables within the economic analysis. The recommendations in this study will allow TXDOT to implement the most cost-effective sign replacement procedure at the time the new standards go into effect. This will ensure that material, manpower, and other expenditures are minimized, resulting in an overall benefit to TXDOT. Based on this review and analysis, it is recommended that TXDOT implement a Sign Management/Inventory System to meet the expected minimum retroreflectivity values and to effectively manage the traffic signs on Texas' highways.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
McCaleb, J. B. (2012). Evaluation of alternative sign replacement strategies. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M324
Chicago Manual of Style (16th Edition):
McCaleb, James Bradley. “Evaluation of alternative sign replacement strategies.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M324.
MLA Handbook (7th Edition):
McCaleb, James Bradley. “Evaluation of alternative sign replacement strategies.” 2012. Web. 19 Sep 2019.
Vancouver:
McCaleb JB. Evaluation of alternative sign replacement strategies. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M324.
Council of Science Editors:
McCaleb JB. Evaluation of alternative sign replacement strategies. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M324
Texas A&M University
7.
McMahan, Anastasia K.
Pedestrian-induced vibrations on structural systems.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M336
► Although models have been suggested to describe the loadings caused by pedestrian motion, they do not adequately model pedestrian loading patterns. Therefore the task of…
(more)
▼ Although models have been suggested to describe the loadings caused by pedestrian motion, they do not adequately model pedestrian loading patterns. Therefore the task of describing pedestrian motion was approached from a different direction and a new, more versatile model of the loading was introduced. These loadings were represented using a step and half-sine Fourier series with variables for the contact time of each foot and the maximum amplitude for each pedestrian mode to be described. These new models also provide the ability to describe the motions of many pedestrians and situations such as phasing, spatial orientation, and crowding. The new pedestrian loading models were applied to different types of structural finite element models and multiple computer simulations were run with variations of loading patterns. Responses from both the previous models and the new models were compared to those from the measured data. Additionally, the responses from different loading patterns with varied spatial, phasing, and crowding situations were analyzed. These simulations proved favorable results of the new model and confirmed the necessity of taking different load situations into consideration.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA ·
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APA (6th Edition):
McMahan, A. K. (2012). Pedestrian-induced vibrations on structural systems. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M336
Chicago Manual of Style (16th Edition):
McMahan, Anastasia K. “Pedestrian-induced vibrations on structural systems.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M336.
MLA Handbook (7th Edition):
McMahan, Anastasia K. “Pedestrian-induced vibrations on structural systems.” 2012. Web. 19 Sep 2019.
Vancouver:
McMahan AK. Pedestrian-induced vibrations on structural systems. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M336.
Council of Science Editors:
McMahan AK. Pedestrian-induced vibrations on structural systems. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M336
Texas A&M University
8.
Muthukrishnan, Shankar.
Oil spill response resources.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M884
► Pollution has become one of the main problems being faced by humanity. Preventing pollution from occurring might be the best idea but is not possible…
(more)
▼ Pollution has become one of the main problems being faced by humanity. Preventing pollution from occurring might be the best idea but is not possible in this fast developing world. So the next best thing to do would be to respond to the pollution source in an effective manner. Oil spills are fast becoming pollution sources that are causing the maximum damage to the environment. This is owing to the compounds that are released and the way oil spreads in both water and land. Preventing the oil spill would be the best option. But once the oil has been spilled, the next best thing to do is to respond to the spill effectively. As a result, time becomes an important factor while responding to an oil spill. Appropriate response to contain and cleanup the spill is required to minimize its potential damage to the ecosystem. Since time and money play a very important role in spill response, it would be a great idea if decisions can be made in such a way that a quick response can be planned. The first part of this study deals with the formation of an 'Oil Spill Resources Handbook', which has information on all the important Oil Spill Contractors. The second and the main part of the study, deals with creating a database in Microsoft Access of the Oil Spill Contractors. The third portion of the study deals with planning an oil spill response using a systems approach.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA ·
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MLA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Muthukrishnan, S. (2012). Oil spill response resources. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M884
Chicago Manual of Style (16th Edition):
Muthukrishnan, Shankar. “Oil spill response resources.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M884.
MLA Handbook (7th Edition):
Muthukrishnan, Shankar. “Oil spill response resources.” 2012. Web. 19 Sep 2019.
Vancouver:
Muthukrishnan S. Oil spill response resources. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M884.
Council of Science Editors:
Muthukrishnan S. Oil spill response resources. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-M884
Texas A&M University
9.
Nageswara, Ramanan Venkat.
Strategies for improved arterial coordination using actuated control.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-N34
► Traffic actuated signals have been efficiently used in controlling isolated I intersections because they respond to random traffic fluctuations using detectors on all approaches. Application…
(more)
▼ Traffic actuated signals have been efficiently used in controlling isolated I intersections because they respond to random traffic fluctuations using detectors on all approaches. Application to coordinated arterial operations is a more complex task and insight into the operational performance of various arterial signal timing strategies is limited. The purposes of this study were to develop a better understanding of the performance of various traffic models providing arterial coordination using actuated control, to determine better ways to use the added flexibility of actuated control in a coordinated system, and to recommend more efficient strategies for coordination using actuated control. Representative traffic control problems were modeled into a statistical testbed using TRAF-NETSIM. A series of scenarios covering a range of arterial geometry, traffic volumes, and traffic actuated control settings were tested. The results indicate that green splits have to be more perfectly tuned in pretimed operation for optimal performance at higher volume levels for a g' en cycle length. At low volumes, any reasonable signal timing strategy works well as long as the detectors work and the traffic signals are coordinated. NETSIM simulation results for pretimed control demonstrate that PASSER 11-90's green splits are optimal and any significant improvement to the arterial is only possible by employing traffic actuated control. It was observed that actuated system performance improved when the arterial's coordinated pretimed phase was reduced from its optimum pretimed value using existing actuated control technology. This finding suggests that a more optimal allocation of arterial green times is possible. Development of an advanced signal controller to implement the recommended control strategy is proposed.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Nageswara, R. V. (2012). Strategies for improved arterial coordination using actuated control. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-N34
Chicago Manual of Style (16th Edition):
Nageswara, Ramanan Venkat. “Strategies for improved arterial coordination using actuated control.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-N34.
MLA Handbook (7th Edition):
Nageswara, Ramanan Venkat. “Strategies for improved arterial coordination using actuated control.” 2012. Web. 19 Sep 2019.
Vancouver:
Nageswara RV. Strategies for improved arterial coordination using actuated control. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-N34.
Council of Science Editors:
Nageswara RV. Strategies for improved arterial coordination using actuated control. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-N34
Texas A&M University
10.
Natarajan, Sriram.
Effect of progression on capacity of interchange ramp weaving.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-N372
► Several traffic operational problems are routinely being experienced at one of the most critical elements in the highway system, i.e., grade-separated interchanges. A concern among…
(more)
▼ Several traffic operational problems are routinely being experienced at one of the most critical elements in the highway system, i.e., grade-separated interchanges. A concern among many practicing engineers is arterial weaving, particularly between the interchange ramp terminal and a closely spaced downstream signalized intersection. High turning volumes and the close spacing between ramp terminals generally associated with interchanges in urbanized areas can create severe operational problems on the cross street. One of the more important factors in determining the level of service of a signalized intersection is the quality of progression along the arterial. The quality of progression is expressed by a progression factor (PF). Simulations were conducted using TRAF-NETSIM to observe the effect of progression on the ramp capacity which showed that the ramp capacity was affected by the quality of progression. The study section consisted of an arterial having an off-ramp on the upstream and a downstream intersection at a distance of 600 feet. There was no signal at the downstream intersection. The ramp traffic, having yield control, made a right turn on to the arterial and then made a left turn at the downstream intersection. All the arterial through traffic was made to go through the downstream intersection without making any turns. Both the default TRAF-NETSIM and Highway Capacity Manual (HCM) recommended decile gap distributions were analyzed. The effect of random flow along the arterial on ramp capacity was studied and a negative exponential regression model was developed to compute ramp capacity for one, two and three lane arterials. Though the trends were found to be similar, due to lower (better) gap acceptance criteria of the HCM recommended decile gap distribution, the ramp capacity while using this distribution was better. The effect of progressed flow on ramp capacity was then studied. It was observed that the variation in ramp capacity for different PF increased with an increase in volume to capacity ratios. Adjustment factors were developed to determine the ramp capacity for different PF given the ramp capacity for random flow.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Natarajan, S. (2012). Effect of progression on capacity of interchange ramp weaving. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-N372
Chicago Manual of Style (16th Edition):
Natarajan, Sriram. “Effect of progression on capacity of interchange ramp weaving.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-N372.
MLA Handbook (7th Edition):
Natarajan, Sriram. “Effect of progression on capacity of interchange ramp weaving.” 2012. Web. 19 Sep 2019.
Vancouver:
Natarajan S. Effect of progression on capacity of interchange ramp weaving. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-N372.
Council of Science Editors:
Natarajan S. Effect of progression on capacity of interchange ramp weaving. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-N372
Texas A&M University
11.
O'Boyle, Margaret.
Evaluation methodology for structures subjected to seismic loading.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-O26
► A method to evaluate the performance of new and existing structures subjected to earthquakes is proposed. This method, derived from the Capacity Spectrum Method, can…
(more)
▼ A method to evaluate the performance of new and existing structures subjected to earthquakes is proposed. This method, derived from the Capacity Spectrum Method, can be used by practicing engineers in the design of new buildings and in the evaluation of existing buildings and retrofit methods. Capacity curves for the overall structure and for each story level are established from an inelastic pushover analysis. The pushover analysis is based on stiffness dependent story shear demands. Seismic story demand points for a given earthquake are determined for initial elastic response and for various levels of structural ductility using response spectrum analysis and modal superposition. The increase in total equivalent viscous damping during the shaking due to the development of hysteretic damping is reflected in the demand points. These points are then joined to form individual demand curves for each story and for the overall structural response. The demand curves are then superimposed onto the capacity curves. The proposed procedure is applied to a one-third scale, three story reinforced concrete frame model building which was subjected to successive shaking table excitations and to the same building after retrofit subjected to the same shaking table excitations. The predicted response found using this method are compared to experimental measurements obtained in the shaking table tests and to the results from nonlinear dynamic analyses. Various additional earthquakes are then used to excite the buildings in order to demonstrate the predictive use of this method. The predicted analytical response from these additional excitations are compared with results obtained from nonlinear dynamic analyses. This study shows that the proposed method can be used to predict the response of a structure to a given earthquake with reliable results.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
O'Boyle, M. (2012). Evaluation methodology for structures subjected to seismic loading. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-O26
Chicago Manual of Style (16th Edition):
O'Boyle, Margaret. “Evaluation methodology for structures subjected to seismic loading.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-O26.
MLA Handbook (7th Edition):
O'Boyle, Margaret. “Evaluation methodology for structures subjected to seismic loading.” 2012. Web. 19 Sep 2019.
Vancouver:
O'Boyle M. Evaluation methodology for structures subjected to seismic loading. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-O26.
Council of Science Editors:
O'Boyle M. Evaluation methodology for structures subjected to seismic loading. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-O26
Texas A&M University
12.
Raina, Madhulika.
Determining TSP, PM10 & PM2.5 using the Coulter Counter Multisizer.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R35
► A new method for determining the PMI 0 concentrations has been developed. It is called the I-fiVol/Coulter process and involves using the high volume sampler…
(more)
▼ A new method for determining the PMI 0 concentrations has been developed. It is called the I-fiVol/Coulter process and involves using the high volume sampler (HVol) and the Coulter Counter particle size distributions. PMIO concentrations are typically determined using samplers approved by the EPA, such as the Wedding samplers. These samplers have a device that separate particulate matter larger than 10jim aerodynamic equivalent diameter prior to filtration. With the FEVol/Coulter method, it is possible to determine PMIO concentrations using total suspends particulate (TSP) measured with a HVol sampler and utilizing a particle size distribution determined with a Coulter Counter Multisizer. This procedure was developed to more accurately determine PMIO concentrations using standard high volume samplers and the Coulter Counter Multisizer. The FEVol/Coulter method can be used to calculate TSP, PMIO and PM2.5 using just one exposed filter. It will assist in regulating PMIO air pollution and can be extended to estimate PNU. 5 concentrations in the future.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Raina, M. (2012). Determining TSP, PM10 & PM2.5 using the Coulter Counter Multisizer. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R35
Chicago Manual of Style (16th Edition):
Raina, Madhulika. “Determining TSP, PM10 & PM2.5 using the Coulter Counter Multisizer.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R35.
MLA Handbook (7th Edition):
Raina, Madhulika. “Determining TSP, PM10 & PM2.5 using the Coulter Counter Multisizer.” 2012. Web. 19 Sep 2019.
Vancouver:
Raina M. Determining TSP, PM10 & PM2.5 using the Coulter Counter Multisizer. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R35.
Council of Science Editors:
Raina M. Determining TSP, PM10 & PM2.5 using the Coulter Counter Multisizer. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R35
Texas A&M University
13.
Ramabhadran, Sanjay.
Solidification/stabilization of simulated uranium and nickel contaminated sludges.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R357
► Research missions in nuclear energy conducted by the U.S. Department of Energy facilities have generated large volumes of mixed wastes with hazardous and radioactive components.…
(more)
▼ Research missions in nuclear energy conducted by the U.S. Department of Energy facilities have generated large volumes of mixed wastes with hazardous and radioactive components. Uranium and nickel are the primary contaminants of concern in this research which focused on better understanding the Solidification/Stabilization (S/S) chemistry, complex waste-binder interactions, and the suitability and effectiveness of additives in the Portland cement based treatment systems. The treatability was investigated with a simulated waste representative of the actual Oak Ridge K-25 pond waste. Screening tools such as the short term slurry tests were used to ascertain the behavior of the contaminants in the cement based systems for a range of binder-to-waste ratios, and optimal substitutions of cement with additives. This was used in combination with the Acid Neutralizing Capacity of the S/S system components to design solid waste form mixes to be evaluated over long curing periods. Attempts at estimating the extent of sorption and other immobilization mechanisms were made using dry and hydrated cement matrices. Portland cement based systems with flyash, silica fume and sodium sulfide as additives were studied. Porewater uranium and nickel concentrations, leachability, physical immobilization in terms Of MacMullin number and Unconfined Compressive Strength, regulatory compliance, and risk reduction were evaluated in the solid waste forms ranging over three binder-to-waste ratios. The 900 mg/L uranium and 3,000 mg/L nickel in the untreated sludge were reduced to less than 10 mg/L uranium and 30 mg /L nickel in the TCLP extract of the solidified waste form.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Ramabhadran, S. (2012). Solidification/stabilization of simulated uranium and nickel contaminated sludges. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R357
Chicago Manual of Style (16th Edition):
Ramabhadran, Sanjay. “Solidification/stabilization of simulated uranium and nickel contaminated sludges.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R357.
MLA Handbook (7th Edition):
Ramabhadran, Sanjay. “Solidification/stabilization of simulated uranium and nickel contaminated sludges.” 2012. Web. 19 Sep 2019.
Vancouver:
Ramabhadran S. Solidification/stabilization of simulated uranium and nickel contaminated sludges. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R357.
Council of Science Editors:
Ramabhadran S. Solidification/stabilization of simulated uranium and nickel contaminated sludges. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R357
Texas A&M University
14.
Reddy, Praveena Gutha.
A comparison of the fracture properties of conventional and polymer-modified two-layer asphalt concrete overlay systems.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R43
► The problem of reflection cracking through the conventional asphalt concrete overlays has increased the need to find new materials which could resist cracking or fracture…
(more)
▼ The problem of reflection cracking through the conventional asphalt concrete overlays has increased the need to find new materials which could resist cracking or fracture more effectively. It is for this reason that polymers (Styrelo are added to the neat asphalt to improve the fracture resisting properties of asphalt concrete. In this study three different asphalt concrete mixtures with and without polymer (Styrelf) were used to study their fracture toughness. With four different binders and different combinations of mixtures, 18 different overlay systems were tested for their fracture toughness. Each overlay was made up of two different layers with asphalt rich sand anti-fracture (SAF) mixture as the bottom layer. Fracture mechanics concepts were used to compare the fracture properties of polymer (Styrelo modified asphalt concrete with the corresponding conventional neat asphalt concrete. Rate of crack growth is correlated with the energy line J*-integral. Crack growth rates were determined from laboratory experiments conducted on TTI overlay tester. Analysis of the experimental results showed that crack growth rate and J*-integral are correlated. In this study it was observed that the relation between the fracture material constants log(A) and (n) is not linear. A new fracture material constant (S) relating to crack speed was developed. The relationship between log(A) and (n) was found to be linear when combined with constant (S). Results showed that this new material constant (S) could lead to a better characterization of fracture toughness. Crack speed when calculated using (S) has shown better correlation with the observed experimental fatigue life. It is speculated that this new material constant (S) could be related to healing of the asphalt concrete or the plasticity effects due to unloading of the sample in overlay test.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Reddy, P. G. (2012). A comparison of the fracture properties of conventional and polymer-modified two-layer asphalt concrete overlay systems. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R43
Chicago Manual of Style (16th Edition):
Reddy, Praveena Gutha. “A comparison of the fracture properties of conventional and polymer-modified two-layer asphalt concrete overlay systems.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R43.
MLA Handbook (7th Edition):
Reddy, Praveena Gutha. “A comparison of the fracture properties of conventional and polymer-modified two-layer asphalt concrete overlay systems.” 2012. Web. 19 Sep 2019.
Vancouver:
Reddy PG. A comparison of the fracture properties of conventional and polymer-modified two-layer asphalt concrete overlay systems. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R43.
Council of Science Editors:
Reddy PG. A comparison of the fracture properties of conventional and polymer-modified two-layer asphalt concrete overlay systems. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-R43
Texas A&M University
15.
Schuckel, Clint Edwin.
An evaluation of supplemental signing at two-way stop-controlled intersections.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S38
► Drivers entering a two-way stop-controlled (TWSC) intersection with similar approach geometries and volumes may make the incorrect assumption that all approach legs are required to…
(more)
▼ Drivers entering a two-way stop-controlled (TWSC) intersection with similar approach geometries and volumes may make the incorrect assumption that all approach legs are required to stop at the intersection. To respond to this safety concern, traffic engineers developed supplemental signs to remind drivers on the stop-controlled roadway that vehicles on the major roadway are not required to stop. The signs are generally placed directly underneath the STOP sign with a typical legend "CROSS TRAFFIC DOES NOT STOP." The objective of this thesis was to investigate the effectiveness of these signs in reducing conflicts and accidents at TWSC intersections. Traffic conflict and accident data were obtained for six TWSC intersections in Texas; three locations where supplemental signs had been installed and three locations with only a standard STOP sign. Only cross traffic conflicts/accidents were analyzed. A cross traffic accident/conflict was defined as an incident involving a vehicle on the stopped approach and a vehicle on the through approach. Conflict data were collected with a video camera mounted on 9.1 meter telescoping mast, Accident and conflicts were not significantly different where supplemental signs have been installed. Probability distributions were developed to establish 90 percentile levels for both accidents and conflicts at TWSC intersections with 5,000 to I 0,000 total entering vehicles per day. These values were found to be 18 conflicts per day and a mean accident frequency of five per year. The relationship between conflict and accident frequency was determined to be a positive linear relationship. The recommendations provide guidelines for future evaluations of safety at TWSC intersections.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Schuckel, C. E. (2012). An evaluation of supplemental signing at two-way stop-controlled intersections. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S38
Chicago Manual of Style (16th Edition):
Schuckel, Clint Edwin. “An evaluation of supplemental signing at two-way stop-controlled intersections.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S38.
MLA Handbook (7th Edition):
Schuckel, Clint Edwin. “An evaluation of supplemental signing at two-way stop-controlled intersections.” 2012. Web. 19 Sep 2019.
Vancouver:
Schuckel CE. An evaluation of supplemental signing at two-way stop-controlled intersections. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S38.
Council of Science Editors:
Schuckel CE. An evaluation of supplemental signing at two-way stop-controlled intersections. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S38
Texas A&M University
16.
Serna, Oscar R.
Dynamic failure prediction of cross-rolled beryllium sheets subjected to vibration loads.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S473
► The principal objective of this investigation is to develop and verify a numerical method for prediction of failure for cross-rolled beryllium sheet structures that are…
(more)
▼ The principal objective of this investigation is to develop and verify a numerical method for prediction of failure for cross-rolled beryllium sheet structures that are subjected to vibration loads. To this end, complementary laboratory experiments and numerical simulations are carried out on glass and beryllium plates. A-total of five glass and nine beryllium specimens with various length-to-width ratios aretested to failure. Energy is imparted to each plate in the form of sinusoidal base excitationby means of a shaker table. Amplitude of excitation at the resonant frequency is continuously increased until the specimen fails; the amplitude is increased from zero to a target maximum within a period of 15 seconds. A high-speed data acquisition system is used to obtain time-history data from transducers attached to each specimen. Strain gages and an accelerometer are attached to the plate and a point on the excitation fixture, respectively. Laboratory tests were conducted at the Vibrations and Control Laboratory of Texas A&M University and at NASA Johnson Space Center. As a precursor to experiments with beryllium, a series of glass specimens were tested in the laboratory and numerically simulated. These plates were clamped by a specially designed fixture at the center of the length to form a double cantilever. Effective length and width dimensions of each specimen vary from 114.3 x 10.0 min (4.5 x 0.4 in.) to 114.3 x 114.3 mm (4.5 x 4.5 in.). AU glass specimens were approximately 2.24 nun (0.088 in.) in thickness. In contrast to the structural symmetry of the glass plates, 2.54-mm (0.1-in.) thick beryllium specimens were clamped only at one end to form a single cantilever. A steel mass was added to the end of each plate in order to decrease its natural frequency, and thereby reduce the acceleration level required to fail the specimen at resonance. Three sets of specimens (each set consisting of three equal size plates) were excited to failure. Two other specimens were also tested to gain additional information. Specimen length and width dimensions vary from I 1 4.3 x 25.4 mm (4.5 x 1.0 in.) to 114.3 x 114.3 mm (4.5 x 4.5 in.). Frequencies of excitation ranged from 71 Hz to 96 Hz. Tsai-Wu failure models for regular annealed glass and cross-rolled beryllium SR200 sheet material are incorporated into a commercial finite element code by means of a specially written subroutine. A failure criterion that is a function of three in-plane components of stress is compared with the stress level at each integration point in the finite element model. A comparison between stress at a point and the failure envelope is made at each incremental load. Failure is predicted to occur when the state of stress at one or more points in the material exceeds those stresses that satisfy the failure criterion. Because each specimen was excited at the first fundamental mode, maximum stresses occurred at the support. Tensile failure stresses of approximately 551,6 Mpa (80,000 psi) were obtained from the beryllium plate experiments. These stresses…
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Serna, O. R. (2012). Dynamic failure prediction of cross-rolled beryllium sheets subjected to vibration loads. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S473
Chicago Manual of Style (16th Edition):
Serna, Oscar R. “Dynamic failure prediction of cross-rolled beryllium sheets subjected to vibration loads.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S473.
MLA Handbook (7th Edition):
Serna, Oscar R. “Dynamic failure prediction of cross-rolled beryllium sheets subjected to vibration loads.” 2012. Web. 19 Sep 2019.
Vancouver:
Serna OR. Dynamic failure prediction of cross-rolled beryllium sheets subjected to vibration loads. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S473.
Council of Science Editors:
Serna OR. Dynamic failure prediction of cross-rolled beryllium sheets subjected to vibration loads. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S473
Texas A&M University
17.
Shull, Lee Anne.
An investigation of driver behavior at highway-railroad grade crossings.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S553
► Highway-railroad grade crossings are classified as either "active" or "passive" depending on the ability of the warning system to indicate the presence of an approaching…
(more)
▼ Highway-railroad grade crossings are classified as either "active" or "passive" depending on the ability of the warning system to indicate the presence of an approaching train. Active crossings are characterized by warning systems such as flashing light signals, automatic gates, and/or bells which are activated by the detection of an approaching train. Often, low traffic volumes and limited funding do not warrant the expenditure required for installation of an active warning system. A passive crossing results, in that the presence of a crossing (rather than the presence of a train) is indicated by the location of the crossbucks. The driver is ultimately responsible for achieving safe passage across a passive crossing because no warning devices alert the driver of approaching trains. This research involved an investigation of driver behavior at active and passive grade crossings. The researcher observed the behavior of thirty drivers while accompanying the participant in his or her vehicle, directing the driver along a test course which incorporated eleven actual crossing scenarios. Driver behavior at grade crossings is indicative of the perceived risk the driver acknowledges. Likewise, observed behavior illustrates the degree of looking behavior and deceleration maneuvers drivers are likely to exhibit when encountering active and passive grade crossing scenarios. Differences were observed in the looking behavior and deceleration maneuvers exhibited by the participants at active and passive crossings along the test course. Drivers initiated more looking behavior at the passive crossings with the exception of an industrial spur track crossing. The observation of different driving behavior at active and passive crossings leads the researcher to infer that drivers apparently detected differences, either subconsciously or unconsciously, in the degree of warning installed at the crossing. The participants were later told the difference between active and passive grade crossings. The subject was then asked to describe what he or she should or would do when approaching these grade crossing scenarios. Although most responses reflected a general understanding of safe driving behavior at grade crossings, most subjects did not actually perform as they said they would when approaching the grade crossings along the test course.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Shull, L. A. (2012). An investigation of driver behavior at highway-railroad grade crossings. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S553
Chicago Manual of Style (16th Edition):
Shull, Lee Anne. “An investigation of driver behavior at highway-railroad grade crossings.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S553.
MLA Handbook (7th Edition):
Shull, Lee Anne. “An investigation of driver behavior at highway-railroad grade crossings.” 2012. Web. 19 Sep 2019.
Vancouver:
Shull LA. An investigation of driver behavior at highway-railroad grade crossings. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S553.
Council of Science Editors:
Shull LA. An investigation of driver behavior at highway-railroad grade crossings. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S553
Texas A&M University
18.
Sivaraju, Muruganandam.
Microbial interactions for 2,4,6-Trinitrotoluene biotransformation.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S58
► Much of the research in the past on the biodegradation of TNT has been directed towards pure culture studies with very little emphasis on mixed…
(more)
▼ Much of the research in the past on the biodegradation of TNT has been directed towards pure culture studies with very little emphasis on mixed populations. Researchers have observed that, on many occasions, microorganisms capable of existing in environments containing xenobiotic compounds, function as a community. Microbial "teamwork" is required for the complete biodegradation of certain xenobiotics, since the metabolic diversity of a microbial community is greater than that of any single component species of that community (Bartha, 1990). Pure culture approach to biodegradation of xenobiotic and natural recalcitrant products have numerous advantages and disadvantages. Pure culture studies allow a more detailed evaluation of pathways, enzymes, degradation intermediates, and products, coupled with simplicity and reproducibility for bioremediation of xenobiotics. However, mixed populations have a higher resistance to toxic compounds, higher quantitative and qualitative biodegradative capabilities, and enhance the significance of genetic exchange between different species leading to the evolution of novel degradative activities (Bull, 1980). Nine aerobic bacterial species, isolated from a munitions waste contaminated site in Illinois, were tentatively identified as one Enterobacter sp., one Pseudomonas sp., and seven Alcaligenes sp. Five of these isolates, Ent. sp. 15, Pseu. sp. 17, and three Alc. sp. I 1 3, 11 5 and 122 were selected for this study to investigate the system efficiency of pure and mixed cultures in the aerobic biotransfonnation of TNT. The isolates were mixed in various combinations of doublets, triplets, quadruplets, and quintuplet. The percentages of TNT transformation were higher for the mixed cultures than the average sum of the transformations of the component species. The average percentages of TNT transformations were in the following order: 5-species > 4-species > 3-species > 2species > isolates. The growth, measured as optical density, was more pronounced in the mixed culture reactors as compared to the isolates. The major intermediates identified were 2amDNT and 4amDNT, with the p-nitro group being more preferentially reduced over the o-nitro group. Sorption/desorption processes were observed in certain reactors containing Pseu. sp. 17 in mixed cultures, but not as an isolate. It appears that faster transformation of TNT is observed in mixed cultures as compared to pure cultures.
Subjects/Keywords: civil engineering; Major civil engineering
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APA (6th Edition):
Sivaraju, M. (2012). Microbial interactions for 2,4,6-Trinitrotoluene biotransformation. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S58
Chicago Manual of Style (16th Edition):
Sivaraju, Muruganandam. “Microbial interactions for 2,4,6-Trinitrotoluene biotransformation.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S58.
MLA Handbook (7th Edition):
Sivaraju, Muruganandam. “Microbial interactions for 2,4,6-Trinitrotoluene biotransformation.” 2012. Web. 19 Sep 2019.
Vancouver:
Sivaraju M. Microbial interactions for 2,4,6-Trinitrotoluene biotransformation. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S58.
Council of Science Editors:
Sivaraju M. Microbial interactions for 2,4,6-Trinitrotoluene biotransformation. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S58
Texas A&M University
19.
Sriraman, Supriya.
Mechanistic modeling of roughness on continuously reinforced concrete pavement.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S737
► Roughness can be termed as the irregularity on the surface of the road which is familiar to all the users of the road. A description…
(more)
▼ Roughness can be termed as the irregularity on the surface of the road which is familiar to all the users of the road. A description of roughness and the database used in this effort are presented. The results of a laboratory test proved the worth of mechanistic modeling. The laboratory test is described in detail. Existing roughness models were reviewed. The data acquisition process, data compilation and data analysis are described. The form of the IRI model is explained. The method employed to arrive at the coefficients is described. Based on the coefficients, roughness models were developed for three climatic regions; wet freeze region, wet no freeze region and dry freeze region.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Sriraman, S. (2012). Mechanistic modeling of roughness on continuously reinforced concrete pavement. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S737
Chicago Manual of Style (16th Edition):
Sriraman, Supriya. “Mechanistic modeling of roughness on continuously reinforced concrete pavement.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S737.
MLA Handbook (7th Edition):
Sriraman, Supriya. “Mechanistic modeling of roughness on continuously reinforced concrete pavement.” 2012. Web. 19 Sep 2019.
Vancouver:
Sriraman S. Mechanistic modeling of roughness on continuously reinforced concrete pavement. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S737.
Council of Science Editors:
Sriraman S. Mechanistic modeling of roughness on continuously reinforced concrete pavement. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S737
Texas A&M University
20.
Stromatt, Rebecca Faye.
Performance of bolted wood connections using supplemental confining devices.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S77
► In the aftermath of the 1994 Northridge Earthquake, extensive field investigations revealed damage in wood frame construction in the form of splitting the 2x4 or…
(more)
▼ In the aftermath of the 1994 Northridge Earthquake, extensive field investigations revealed damage in wood frame construction in the form of splitting the 2x4 or 2x6 dimension lumber sill plates along the line of anchor bolts which typically connect shear walls to the masonry or concrete foundation. This paper presents an experimental investigation on the performance of bolted wood connections at the yield and ultimate limit states during monotonic and incremental quasi-static reversed cyclic loading and suggests possible retrofit strategies for their improved seismic performance. Proposed retrofit strategies are based on providing confinement to the bolted wood member using metal reinforcing ;traps and reinforcing clamps to increase the deformation capability and energy dissipation capacity of the connection, while maintaining substantial levels of connection strength. Connection types included in the investigation are: (1) double shear wood-to-wood connections; and (2) single shear simulated sill plate-to-concrete foundation connections.
Subjects/Keywords: civil engineering; Major civil engineering
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APA (6th Edition):
Stromatt, R. F. (2012). Performance of bolted wood connections using supplemental confining devices. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S77
Chicago Manual of Style (16th Edition):
Stromatt, Rebecca Faye. “Performance of bolted wood connections using supplemental confining devices.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S77.
MLA Handbook (7th Edition):
Stromatt, Rebecca Faye. “Performance of bolted wood connections using supplemental confining devices.” 2012. Web. 19 Sep 2019.
Vancouver:
Stromatt RF. Performance of bolted wood connections using supplemental confining devices. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S77.
Council of Science Editors:
Stromatt RF. Performance of bolted wood connections using supplemental confining devices. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S77
Texas A&M University
21.
Sullivan, George Ray.
Owner/contractor work structure process with integrated alignment framework.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S85
► Owner and contractor companies are experiencing organizational change in an attempt to maintain or increase their marketshare in a global economy. This change is driven…
(more)
▼ Owner and contractor companies are experiencing organizational change in an attempt to maintain or increase their marketshare in a global economy. This change is driven by attempts to reduce fixed costs, decrease workloads due to smaller annual capital program expenditures , and to improve operational efficiency. For their capital projects, owners want the highest quality project, as fast as possible, at the lowest possible cost, with no harm to workers or the environment. To accomplish this, owners and contractors must form work structures that clearly define major roles and responsibilities of each participant to avoid gaps and eliminate overlaps. This thesis presents a work process with an alignment framework to determine the most appropriate use, strategically, of owner resources in working relationships with contractors to successfully develop and execute projects and to achieve corporate and project objectives recognizing less owner engineering resources. This work process will address several key issues. The first is competencies and core competencies. The second is decisions about sourcing of competencies. The third is the influence of skills and skill levels in sourcing decisions. The fourth is the connection between working relationships and organizational problems. The final issue is the ability to evaluate/measure if the most appropriate decision has been made.
Subjects/Keywords: civil engineering; Major civil engineering
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APA (6th Edition):
Sullivan, G. R. (2012). Owner/contractor work structure process with integrated alignment framework. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S85
Chicago Manual of Style (16th Edition):
Sullivan, George Ray. “Owner/contractor work structure process with integrated alignment framework.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S85.
MLA Handbook (7th Edition):
Sullivan, George Ray. “Owner/contractor work structure process with integrated alignment framework.” 2012. Web. 19 Sep 2019.
Vancouver:
Sullivan GR. Owner/contractor work structure process with integrated alignment framework. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S85.
Council of Science Editors:
Sullivan GR. Owner/contractor work structure process with integrated alignment framework. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-S85
Texas A&M University
22.
Titus-Glover, Cyril James.
Evaluation of the adequacy of the 2000P test vehicle as a surrogate for light truck subclasses.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T58
► This study evaluated the adequacy of the 2000P test vehicle as a surrogate for light truck subclasses. The National Cooperative Highway Research Program (NCHRP) Report…
(more)
▼ This study evaluated the adequacy of the 2000P test vehicle as a surrogate for light truck subclasses. The National Cooperative Highway Research Program (NCHRP) Report 350 recommended the use of a 3/4-ton (approximately 2000 kg) pickup as the surrogate for all light truck subclasses. This standard test vehicle, the 3/4-ton pick-up truck (designated as the 2000P test vehicle in NCHRP Report 350) replaced the 2040 kg (4500 lb) passenger car which till its replacement in 1993, was the standard test vehicle of that weight class for all formal vehicle crash testing procedures. The study approach consisted of the following main tasks:, 1. Identification and comparison of key vehicle parameters. 2.literature review. 3.Statistical study 4. Simulation study. 5.Synthesize results. 6.Prepare thesis. In the initial part of the study key vehicle parameters were identified and used in a preliminary assessment of the 2000P test vehicle. These parameters were then used as statistical variables in the statistical study undertaken. The HVOSM computer simulation program was then used to evaluate representatives of the larger light truck subclasses and the 2000P test vehicle on impact with selected roadside features. A comparison scheme developed using NCHRP Report 350 was then utilized in the evaluation of simulation results. Results were then synthesized and a thesis prepared on the surrogate sufficiency of the 2000P test vehicle. Drawbacks and limitations experienced during tasks were outlined as well as the contribution and significance of the entire study. A six year ceiling was recommended by the NCHRP Report 350 by Ross et al. (1993) for the purpose of vehicle selection for crash testing purposes. Hence this study focuses on the modern light truck fleet, model years 1990 through present.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Titus-Glover, C. J. (2012). Evaluation of the adequacy of the 2000P test vehicle as a surrogate for light truck subclasses. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T58
Chicago Manual of Style (16th Edition):
Titus-Glover, Cyril James. “Evaluation of the adequacy of the 2000P test vehicle as a surrogate for light truck subclasses.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T58.
MLA Handbook (7th Edition):
Titus-Glover, Cyril James. “Evaluation of the adequacy of the 2000P test vehicle as a surrogate for light truck subclasses.” 2012. Web. 19 Sep 2019.
Vancouver:
Titus-Glover CJ. Evaluation of the adequacy of the 2000P test vehicle as a surrogate for light truck subclasses. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T58.
Council of Science Editors:
Titus-Glover CJ. Evaluation of the adequacy of the 2000P test vehicle as a surrogate for light truck subclasses. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T58
Texas A&M University
23.
Toneatti, Silvana Victoria.
Dealing with uncertainty in estimating average annual flood damage for ungaged watersheds.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T64
► Average annual damage (AAD) is a key central component of the hydrologic, hydraulic, and economic information developed in the evaluation of flood damage reduction plans.…
(more)
▼ Average annual damage (AAD) is a key central component of the hydrologic, hydraulic, and economic information developed in the evaluation of flood damage reduction plans. AAD or the expected value of annual damage, in dollars, is a probabflityweighted average of the economic losses associated with the full range of possible flood magnitudes. The Corps of Engineers and others have developed procedures for evaluating AAD that have been applied to numerous feasibil4 studies over the past several decades. A new risk-based analysis approach, currently being adopted in the United States, is based on modifying the conventional procedures to explicitly model the uncertainties involved in developing the required hydrologic, hydraulic, and economic relationships. This research evaluates the uncertainties involved in developing the three basic relationships required to estimate AAD and performs related damage analysis. Also, within this research an approach is developed for explicitly incorporating uncertainties in the basic relationships for the risk-based approach in an ungaged watershed. In addition, this research performs a sensitivity analysis on the risk-based approach AAD estimates and compares the conventional versus explicit uncertainty analysis approaches for evaluating average annual damages of an ungaged watershed. A case study was performed on a local watershed where the physical and economic systems were estimated and analyzed. Based on the case study, the new risk-based approach provides several advantages over the conventional AAD evaluation methods. Primarily, the risk-based approach provides more quantitative information to support decision-making processes such as capabilities for developing an AAD versus frequency relationship for a specified period-of-analysis rather than a single point estimate of AAD. In addition, the riskbased approach should provide more accurate AAD estimates.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Toneatti, S. V. (2012). Dealing with uncertainty in estimating average annual flood damage for ungaged watersheds. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T64
Chicago Manual of Style (16th Edition):
Toneatti, Silvana Victoria. “Dealing with uncertainty in estimating average annual flood damage for ungaged watersheds.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T64.
MLA Handbook (7th Edition):
Toneatti, Silvana Victoria. “Dealing with uncertainty in estimating average annual flood damage for ungaged watersheds.” 2012. Web. 19 Sep 2019.
Vancouver:
Toneatti SV. Dealing with uncertainty in estimating average annual flood damage for ungaged watersheds. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T64.
Council of Science Editors:
Toneatti SV. Dealing with uncertainty in estimating average annual flood damage for ungaged watersheds. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T64
Texas A&M University
24.
Tyner, Fred Mack.
A comparison of trip production rates developed from two types of travel survey diaries.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T96
► In recent years, two types of travel survey diaries have been used to collect travel behavior data for transportation planning: travel diaries and activity diaries.…
(more)
▼ In recent years, two types of travel survey diaries have been used to collect travel behavior data for transportation planning: travel diaries and activity diaries. In the travel diary, respondents are prompted to respond for each trip. Further questions are used to collect other information about each trip. In the activity diary, the respondent is prompted to respond by each activity. If travel is required for that activity, the respondent is then asked about that trip. Both collect the same I . nformation, but the recall frameworks are different. The primary objective of this research is to provide a statistically valid comparison of the trip rates reported by the activity diary to those reported by the travel diary. Additional purposes are to understand the nature of any differences and to understand why these differences exist. For this study, data from two Los Angeles area surveys are compared. The first is the 1991 Southern California Origin/Destination Survey, which was conducted using an activity diary. The second is the California Statewide Travel Survey, which was conducted using a travel diary. The travel diary reported higher trip rates than the activity diary, especially for driver trips. This difference is explained by differences in the reported rates for the shopping and "other" activities. Evidence suggests that the difference is due to the way in which people perceive "activities" and "trips. " Some "activities, " may be seen as taking place at multiple locations. As a result, the activity diary may not record the trips internal to this activity. Likewise, some "trips" may be seen as including minor activities along the way. As a result, the travel diary may record a single "trip" where two or more smaller trips had actually taken place. The findings of this research suggest that, in the short term, the travel diary should be used for collecting travel behavior data. The activity diary, however, may be preferred where the application of an activity-based model is likely. For the longer term, the development of a new instrument combining the best characteristics of the travel diary and the activity diary is recommended.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Tyner, F. M. (2012). A comparison of trip production rates developed from two types of travel survey diaries. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T96
Chicago Manual of Style (16th Edition):
Tyner, Fred Mack. “A comparison of trip production rates developed from two types of travel survey diaries.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T96.
MLA Handbook (7th Edition):
Tyner, Fred Mack. “A comparison of trip production rates developed from two types of travel survey diaries.” 2012. Web. 19 Sep 2019.
Vancouver:
Tyner FM. A comparison of trip production rates developed from two types of travel survey diaries. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T96.
Council of Science Editors:
Tyner FM. A comparison of trip production rates developed from two types of travel survey diaries. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-T96
Texas A&M University
25.
Waite, Andrew James.
The usefulness of solid oxidants for biostimulation, determined by their kinetics and stoichiometry.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W34
► The increased interest in in situ bioremediation has developed a commensurate increased interest in soil chemical amendments. These amendments increase the level of one or…
(more)
▼ The increased interest in in situ bioremediation has developed a commensurate increased interest in soil chemical amendments. These amendments increase the level of one or more limiting nutrients in the natural environment. Along with the conventional constituents of interest such as nitrogen and phosphorous, oxygen (02) is an important, often limiting, compound in both flooded and subsurface soils. Chemical formulations were developed to provide oxygen to these anoxic environments. We evaluated, in distilled water, the release rates of four chemical compounds formulated for the slow release of oxygen that may be used to enhance bioremediation. The release rates were determined by polarographic measurement of the 02 concentration over time from sealed batch reactors. The acquired analog data was converted to digital and logged to computer. This research addressed the questions of release rates, oxygen to solid ratios, and probability of migration into the soil. We developed a predictive model for the release of oxygen from these solid additives. The four oxidants were: sodium-percarbonate (Na2CO3'1.5H202) encapsulated in poly(vinyhdene chloride) (PVDC); free sodium-percarbonate crystals; calcium peroxide (CaO2); and magnesium peroxide (MgO2). The highest calculated release rate was generated by the unencapsulated Na2CO3'1.5H202 (132 mgl-' hr-'), followed by CaO2 (3.2 mgr' hr-'), then the encapsulated Na2CO3'1.5H202 (1.77X 10-2 mgrl hr-'). The lowest release rate was for M902 (1.57X 10-3 mgr' hr-'). The data indicated that M902 or a niix of M902 and CaO2 hold the highest promise for use in saturated surface soil applications.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Waite, A. J. (2012). The usefulness of solid oxidants for biostimulation, determined by their kinetics and stoichiometry. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W34
Chicago Manual of Style (16th Edition):
Waite, Andrew James. “The usefulness of solid oxidants for biostimulation, determined by their kinetics and stoichiometry.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W34.
MLA Handbook (7th Edition):
Waite, Andrew James. “The usefulness of solid oxidants for biostimulation, determined by their kinetics and stoichiometry.” 2012. Web. 19 Sep 2019.
Vancouver:
Waite AJ. The usefulness of solid oxidants for biostimulation, determined by their kinetics and stoichiometry. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W34.
Council of Science Editors:
Waite AJ. The usefulness of solid oxidants for biostimulation, determined by their kinetics and stoichiometry. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W34
Texas A&M University
26.
Wellborn, Michael Wayne.
Alternatives for reducing the environmental risks associated with natural disasters and their effects on pipelines.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W455
► Past pipeline failure reports have typically focused on corrosion and third party related events. However, natural disasters pose a substantial risk to pipeline integrity as…
(more)
▼ Past pipeline failure reports have typically focused on corrosion and third party related events. However, natural disasters pose a substantial risk to pipeline integrity as well. Therefore, it was the objective of this thesis to analyze the risks and consequences of pipelines being seriously affected by natural disasters and propose potential measures to prevent leaks or spills and to mitigate the consequences of leaks and spills resulting from natural disasters. A risk assessment method has been developed for ranking the risks associated with pipelines in natural disaster areas and prevention and mitigation concepts have been recommended and discussed for reducing the risks.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Wellborn, M. W. (2012). Alternatives for reducing the environmental risks associated with natural disasters and their effects on pipelines. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W455
Chicago Manual of Style (16th Edition):
Wellborn, Michael Wayne. “Alternatives for reducing the environmental risks associated with natural disasters and their effects on pipelines.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W455.
MLA Handbook (7th Edition):
Wellborn, Michael Wayne. “Alternatives for reducing the environmental risks associated with natural disasters and their effects on pipelines.” 2012. Web. 19 Sep 2019.
Vancouver:
Wellborn MW. Alternatives for reducing the environmental risks associated with natural disasters and their effects on pipelines. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W455.
Council of Science Editors:
Wellborn MW. Alternatives for reducing the environmental risks associated with natural disasters and their effects on pipelines. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W455
Texas A&M University
27.
Wenaas, Christopher Eric.
Fluoride removal in the presence of organophosphates: application to chemical warfare agent destruction.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W463
► New international policy and the inherent danger of chemical weapons storage has produced an unprecedented demand for the destruction of chemical warfare agent (CWA) stockpiles.…
(more)
▼ New international policy and the inherent danger of chemical weapons storage has produced an unprecedented demand for the destruction of chemical warfare agent (CWA) stockpiles. In the face of bitter opposition to the use of incineration for disposal, policy makers have been forced to examine other, more environmentally sound alternatives. One such alternative is the use of a combined chemical and biological treatment system. Sarin (GB), one of the more prevalent nerve agents stockpiled by the U.S. and Russia, undergoes a hydrolysis reaction in the presence of water and sodium hydroxide to form isopropyhnethylphosphonic acid (IMPA) and sodium fluoride. IMPA can. be degraded biologically to form methylphosphonic acid (MPA) and eventually phosphate. The purpose of this study was to identify what currently available technology could separate fluoride from a waste stream containing these GB degradation products. Chemical precipitation, ion exchange, and adsorption were examined for their ability to remove fluoride from the matrix. While poor separation was achieved by chemical precipitation and ion exchange, activated alumina was able to effectively separate fluoride from MPA and IMPA. Activated alumina was shown to exhibit a strong affinity for alumina, even at high pH, and in the presence of IMPA and MPA. A design using multiple columns containing fluidized beds of alumina placed prior to biological treatment was chosen as a likely reactor configuration. By placing the fluoride removal system ahead of biological treatment, this design would protect microorganisms from fluoride toxicity. The use of a fluidized bed prevented the clogging often associated gravity beds, and maximized the fluoride capacity of the alumina.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Wenaas, C. E. (2012). Fluoride removal in the presence of organophosphates: application to chemical warfare agent destruction. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W463
Chicago Manual of Style (16th Edition):
Wenaas, Christopher Eric. “Fluoride removal in the presence of organophosphates: application to chemical warfare agent destruction.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W463.
MLA Handbook (7th Edition):
Wenaas, Christopher Eric. “Fluoride removal in the presence of organophosphates: application to chemical warfare agent destruction.” 2012. Web. 19 Sep 2019.
Vancouver:
Wenaas CE. Fluoride removal in the presence of organophosphates: application to chemical warfare agent destruction. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W463.
Council of Science Editors:
Wenaas CE. Fluoride removal in the presence of organophosphates: application to chemical warfare agent destruction. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-W463
Texas A&M University
28.
Collins, Jon Michael.
Relationship between speed distribution measures and rural two-lane highway characteristics.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-C652
► Understanding the behavior of speed population distributions on rural two-lane highways is needed to address driver error associated with elements of the highway. Previous research…
(more)
▼ Understanding the behavior of speed population distributions on rural two-lane highways is needed to address driver error associated with elements of the highway. Previous research has identified a direct relationship between speed variance and accident potential. Therefore, identifying relationships between speed distribution measures of free-flowing passenger vehicles and roadway characteristics could be used to distinguish consistent and inconsistent roadway features. Specifically, the focus of this study was on understanding the relationship between mean speed, speed variance, and roadway characteristics. Horizontal curves from four geographic regions were identified based on selected criteria, and speed data were collected at the midpoint of the preceding tangent and the curve midpoint. The results identified a relationship between mean speed, speed variance, and the roadway characteristics for tangents and horizontal curves. The study also analyzed the speed difference between successive horizontal features and found an average speed reduction based on the curve radius. Mean speed and speed standard deviation were related to the posted speed of the roadway, the length of the tangent, and the radius of the curve. The speed reduction from the tangent to the horizontal curve was a function of the curve radius. The research documents that tangents greater than 250 meters give drivers ample opportunity to reach their desired speeds. Incorporating the 10 km/h speed differential between features suggested by Lamm, a minimum radius following long tangents was recommended. For horizontal curves following tangent lengths greater than 250 meters, the radius should be greater than 150 meters to ensure speed differences between the tangent and horizontal curve are less than IO km/h.
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA (6th Edition):
Collins, J. M. (2012). Relationship between speed distribution measures and rural two-lane highway characteristics. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-C652
Chicago Manual of Style (16th Edition):
Collins, Jon Michael. “Relationship between speed distribution measures and rural two-lane highway characteristics.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-C652.
MLA Handbook (7th Edition):
Collins, Jon Michael. “Relationship between speed distribution measures and rural two-lane highway characteristics.” 2012. Web. 19 Sep 2019.
Vancouver:
Collins JM. Relationship between speed distribution measures and rural two-lane highway characteristics. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-C652.
Council of Science Editors:
Collins JM. Relationship between speed distribution measures and rural two-lane highway characteristics. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-C652
Texas A&M University
29.
Drazenovic, Mirna.
A theoretical study of discrete air phase migration contaminated with a volatile organic.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-D74
► A theoretical study of discrete air phase migration contaminated with a volatile organic is developed in order to study air bubble migration through granular porous…
(more)
▼ A theoretical study of discrete air phase migration contaminated with a volatile organic is developed in order to study air bubble migration through granular porous media in air sparging technology. The experiment is performed in a homogeneous, isotropic, and stationary porous medium presented by a fully saturated cylindrical column filled with 0.4-cm glass beads in an orthorhombic packing order. This study consists of two parts. The first part of the study describes the air bubble motion through saturated porous media, while the second part presents volatile contaminant transport in bubbly air flow. The first part of the study is developed in order to determine bubble rise velocity in four flow regimes i.e., steady state, quasi-steady state, unsteady state with the local term of the total acceleration only, and unsteady state, including the convective component of the total acceleration. The bubble rise velocity for each state is derived from the momentum balance equation for corresponding flow. Since in the quasi-steady state bubble rise velocity reaches the steady state over the short distance and in the unsteady state, with the local term of the total acceleration only it reaches the steady state over the short time, it may be considered that bubble's motion in a porous medium is in a steady state. The steady state solution shows that bubble rise velocity is dependent on the bubble size. In order to study the impacts of liquid and structural medium properties on bubble rise velocity, the Peeble and Garber's analyses of four types of bubble's motion in liquids are applied on the porous medium. Dimensional analyses show that motion of an air bubble rise in water is in the region IV, in which fluid flow is in a steady state. Moreover in this region, fluid flow can be assumed to be inviscid because of the large Reynolds numbers i.e., greater than 1400. The second part of the study is elaborated in Order to estimate the con contaminant ma s quantity accumulated in the air Phase 'mass transfer model between inimobile water and mobile gas Phase is al presented by advective-diffusion volatile contaminant transport equation in bubbly air flow Presented by Of this equation demonstrate that gas mass co,, contaminant. The results the bubble reaches the equilibrium concentrate concentration accumulated inside the number of bubbles on with liquid Phase instantly. injection. is larger in the continuous type than in the air
Subjects/Keywords: civil engineering.; Major civil engineering.
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Drazenovic, M. (2012). A theoretical study of discrete air phase migration contaminated with a volatile organic. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-D74
Chicago Manual of Style (16th Edition):
Drazenovic, Mirna. “A theoretical study of discrete air phase migration contaminated with a volatile organic.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-D74.
MLA Handbook (7th Edition):
Drazenovic, Mirna. “A theoretical study of discrete air phase migration contaminated with a volatile organic.” 2012. Web. 19 Sep 2019.
Vancouver:
Drazenovic M. A theoretical study of discrete air phase migration contaminated with a volatile organic. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-D74.
Council of Science Editors:
Drazenovic M. A theoretical study of discrete air phase migration contaminated with a volatile organic. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-D74
Texas A&M University
30.
Durmusoglu, Ertan.
An experimental study of horizontal barrier formation and containment of NAPLs by gelling liquids.
Degree: MS, civil engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-D87
► A number of experimental laboratory studies on grouting technologies have been reported in the literature. However, most of these studies are not applicable to subsurface…
(more)
▼ A number of experimental laboratory studies on grouting technologies have been reported in the literature. However, most of these studies are not applicable to subsurface barrier containment of nonaqueous phase liquids (NAPLS) such as trichloroethylene (TCE) or gasoline. Also, vertical barriers have been studied more than horizontal barriers in the subsurface barrier technology. Due to the need for horizontal barrier formation studies, experiments to form a contiguous horizontal layer by injecting gelling liquids through horizontal and vertical pipes will be conducted in this study. Before the barrier formation in the two-dimensional studies, pre-and post-injection hydraulic conductivity measurements to quantify hydraulic conductivity reductions will be carried out in the one-dimensional columns. After an impervious layer is produced, durability of the grouted porous media in the presence of typical contaminants will be investigated. The proposed research aims at the testing of techniques to emplace gelling liquids in subsurface environments to form horizontal barriers to isolate the downward migration of NAPLS.
Subjects/Keywords: civil engineering.; Major civil engineering.
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Record Details
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Durmusoglu, E. (2012). An experimental study of horizontal barrier formation and containment of NAPLs by gelling liquids. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-D87
Chicago Manual of Style (16th Edition):
Durmusoglu, Ertan. “An experimental study of horizontal barrier formation and containment of NAPLs by gelling liquids.” 2012. Masters Thesis, Texas A&M University. Accessed September 19, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-D87.
MLA Handbook (7th Edition):
Durmusoglu, Ertan. “An experimental study of horizontal barrier formation and containment of NAPLs by gelling liquids.” 2012. Web. 19 Sep 2019.
Vancouver:
Durmusoglu E. An experimental study of horizontal barrier formation and containment of NAPLs by gelling liquids. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2019 Sep 19].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-D87.
Council of Science Editors:
Durmusoglu E. An experimental study of horizontal barrier formation and containment of NAPLs by gelling liquids. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-D87
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