You searched for subject:(fission).
Showing records 1 – 30 of
623 total matches.
◁ [1] [2] [3] [4] [5] … [21] ▶
Texas A&M University
1.
Brooks, Arielle L.
Single Particle Fluorescence Burst Analysis of Membrane Fission.
Degree: MS, Biochemistry, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155216 
► The ability to catalyze the fission step of endocytosis is critical to many biological processes including cell communication and synaptic transmission. This activity must be…
(more)
▼ The ability to catalyze the
fission step of endocytosis is critical to many biological processes including cell communication and synaptic transmission. This activity must be tightly regulated for cellular homeostasis. Limitations of current approaches used for the study of this process, in conjunction with a historical focus on neuronal systems that may not generalize to somatic cells, have left the field torn between several conflicting models. Functional redundancy of several key players complicate interpretation of in vivo studies, stressing the need for a sensitive in vitro approach capable of revealing attenuated activity of tightly regulated machinery. In this document, we introduce Burst Analysis Spectroscopy (BAS) as a simple reagent sparing approach for the investigation of vesicle membrane
fission. Using BAS, we accurately map liposome distributions across several orders of magnitude and observe subtle shifts in liposome population as functions of time, temperature, and protein concentration using the
fission potent ENTH domain of the protein epsin. We proceed to further uncover an unrecognized
fission activity of full-length epsin, consistent with a mechanism in which membrane
fission proceeds as a consequence of amphipathic helix insertion into the lipid bilayer.
Advisors/Committee Members: Rye, Hays (advisor), Pellois, Jean-Philippe (committee member), Harlow, Mark (committee member), Hu, Jim (committee member).
Subjects/Keywords: fission; membranes
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Brooks, A. L. (2015). Single Particle Fluorescence Burst Analysis of Membrane Fission. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155216
Chicago Manual of Style (16th Edition):
Brooks, Arielle L. “Single Particle Fluorescence Burst Analysis of Membrane Fission.” 2015. Masters Thesis, Texas A&M University. Accessed January 23, 2021.
http://hdl.handle.net/1969.1/155216.
MLA Handbook (7th Edition):
Brooks, Arielle L. “Single Particle Fluorescence Burst Analysis of Membrane Fission.” 2015. Web. 23 Jan 2021.
Vancouver:
Brooks AL. Single Particle Fluorescence Burst Analysis of Membrane Fission. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1969.1/155216.
Council of Science Editors:
Brooks AL. Single Particle Fluorescence Burst Analysis of Membrane Fission. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155216
University of Cincinnati
2.
Xie, Tianyou.
Monte Carlo Simulation Research on the Spontaneous Fission
Yield of 240Pu.
Degree: PhD, Engineering and Applied Science: Nuclear and
Radiological Engineering, 2015, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1448275275
► This research describes results of mathematical simulations to predict the spontaneous fission yield of 240Pu thereby guiding selection of a suitable fission product for use…
(more)
▼ This research describes results of mathematical
simulations to predict the spontaneous
fission yield of
240Pu thereby guiding selection of a
suitable
fission product for use as a radiochronometer for weapons
grade plutonium. The PUREX process is effective in separating
plutonium and uranium in irradiated nuclear fuel from
fission
products, which may make it possible to use one or more of the
spontaneous
fission products from
240Pu as a
radiochronometer. However, the
fission product inventory from the
spontaneous
fission of
240Pu reported in the
literature is quite variable. The non-uniform induced
fission
probability at multiple neutron energies makes the induced
fission
yield too complex to be listed as a single value. The neutron flux
distribution from a source containing
240Pu
is a combination of both spontaneous and induced fissions.
Fission
products generated in this source are due to a combination of
spontaneous and induced
fission processes, each with a unique
neutron energy distribution and
fission product yield. The physical
conditions of the source (i.e., size, shape, etc.) will have a
significant influence on the neutron flux distribution and the
induced
fission probability associated with
240Pu. Thus, it is likely that there is a
relationship between the combined (spontaneous and induced)
fission
yield and the physical conditions of the source. Exploring this
relationship, a table of values will be generated to predict the
combined
fission product yield for any source geometry containing
240Pu. Minimizing variations in the source
geometry should stabilize the combined
fission product yield and
provide a means to determine the spontaneous
fission probability
for
240Pu. This research has identified that
the combined
fission product yields from
97Zr and
138Xe
exhibit less sensitivity to the physical source parameters than
other
fission products making them good candidates as
radiochronometers for age dating weapons-grade
plutonium.
Advisors/Committee Members: Spitz, Henry (Committee Chair).
Subjects/Keywords: Engineering; Pu; spontaneous fission; induced fission; radiochronomiter
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Xie, T. (2015). Monte Carlo Simulation Research on the Spontaneous Fission
Yield of 240Pu. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1448275275
Chicago Manual of Style (16th Edition):
Xie, Tianyou. “Monte Carlo Simulation Research on the Spontaneous Fission
Yield of 240Pu.” 2015. Doctoral Dissertation, University of Cincinnati. Accessed January 23, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1448275275.
MLA Handbook (7th Edition):
Xie, Tianyou. “Monte Carlo Simulation Research on the Spontaneous Fission
Yield of 240Pu.” 2015. Web. 23 Jan 2021.
Vancouver:
Xie T. Monte Carlo Simulation Research on the Spontaneous Fission
Yield of 240Pu. [Internet] [Doctoral dissertation]. University of Cincinnati; 2015. [cited 2021 Jan 23].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1448275275.
Council of Science Editors:
Xie T. Monte Carlo Simulation Research on the Spontaneous Fission
Yield of 240Pu. [Doctoral Dissertation]. University of Cincinnati; 2015. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1448275275
Vanderbilt University
3.
Willet, Alaina Hollister.
Mechanisms Regulating Cytokinetic
Contractile Ring Formation and
Anchoring in Schizosaccharomyces
pombe.
Degree: PhD, Cell and Developmental Biology, 2017, Vanderbilt University
URL: http://hdl.handle.net/1803/13870
► In Schizosaccharomyces pombe cytokinesis requires assembly and constriction of an actomyosin-based contractile ring (CR). Nucleation of F-actin for the CR requires a single essential formin,…
(more)
▼ In Schizosaccharomyces pombe cytokinesis requires assembly and constriction of an actomyosin-based contractile ring (CR). Nucleation of F-actin for the CR requires a single essential formin, Cdc12, that localizes to the cell middle upon mitotic onset. The molecular mechanisms dictating its divison site targeting during cytokinesis are unknown. We defined that a Cdc12 N-terminal motif directly binds the F-BAR domain of the scaffolding protein Cdc15 and this interaction is controlled by Cdk1 phosphorylation of Cdc12. Phosphorylation of Cdc12 inhibits binding to the F-BAR Cdc15. cdc12 alleles that cannot bind Cdc15 or with all six Cdk1 sites mutated to phospho-mimetic residues show reduced Cdc12 cell division site accumulation and delayed CR formation. Thus Cdk1 phosphorylation of Cdc12 antagonizes its interaction with Cdc15 and its division site localization, consistent with a general role for Cdk1 in inhibiting cytokinesis until chromosome segregation is complete.
The CR is physically linked to the plasma membrane (PM). Cells lacking efr3, which encodes a conserved PM scaffold for the phosphatidylinositol 4-kinase Stt4, build CRs that can slide away from the cell middle in a myosin-V-dependent manner. The Efr3-dependent CR anchoring mechanism is distinct from previously reported pathways dependent on the F-BAR protein Cdc15 and paxillin. In efr3∆, the concentrations of several membrane-binding proteins were reduced in the CR and/or on the PM. Our results suggest that proper PM lipid composition is important to stabilize the central position of the CR and resist myosin V-based forces to promote the fidelity of cell division.
Advisors/Committee Members: Kathleen Gould (committee member), Matthew Tyska (committee member), Ryoma Ohi (committee member), Alissa Weaver (committee member), Irina Kaverina (Committee Chair).
Subjects/Keywords: cytokinesis; fission yeast
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Willet, A. H. (2017). Mechanisms Regulating Cytokinetic
Contractile Ring Formation and
Anchoring in Schizosaccharomyces
pombe. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/13870
Chicago Manual of Style (16th Edition):
Willet, Alaina Hollister. “Mechanisms Regulating Cytokinetic
Contractile Ring Formation and
Anchoring in Schizosaccharomyces
pombe.” 2017. Doctoral Dissertation, Vanderbilt University. Accessed January 23, 2021.
http://hdl.handle.net/1803/13870.
MLA Handbook (7th Edition):
Willet, Alaina Hollister. “Mechanisms Regulating Cytokinetic
Contractile Ring Formation and
Anchoring in Schizosaccharomyces
pombe.” 2017. Web. 23 Jan 2021.
Vancouver:
Willet AH. Mechanisms Regulating Cytokinetic
Contractile Ring Formation and
Anchoring in Schizosaccharomyces
pombe. [Internet] [Doctoral dissertation]. Vanderbilt University; 2017. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1803/13870.
Council of Science Editors:
Willet AH. Mechanisms Regulating Cytokinetic
Contractile Ring Formation and
Anchoring in Schizosaccharomyces
pombe. [Doctoral Dissertation]. Vanderbilt University; 2017. Available from: http://hdl.handle.net/1803/13870
University of New Mexico
4.
Blakeley, Richard Emery.
Development of The University of New Mexico Spectrometer for High-Resolution Fission Product Yield Data.
Degree: Nuclear Engineering, 2018, University of New Mexico
URL: https://digitalrepository.unm.edu/ne_etds/76
► Well-defined fission product yield data has been of increasing interest in various applications within the nuclear industry. With this need in mind, a fission…
(more)
▼ Well-defined
fission product yield data has been of increasing interest in various applications within the nuclear industry. With this need in mind, a
fission fragment mass spectroscopy system was designed and developed at the University of New Mexico in collaboration with the Los Alamos National Laboratories with a stated goal of attaining a mass resolution of ≤ 1 % (FWHM/centroid) for light fragments and near 1 % for heavy fragments. The mass spectrometer utilized in this work consists of a transmission time-of-flight detection system to measure
fission product velocity and an axial ionization chamber to measure the
fission product energy, with measurements giving quasi-prompt (~50 - 100 ns)
fission data. With these measured quantities of velocity and energy, the
fission product mass can be calculated. As an additional feature, the ionization chamber was designed to serve as a time projection chamber, providing information regarding the
fission product depth of penetration in the ionization gas, and thus information on the stopping power and the
fission product atomic number, Z.
Measurements of mass and Z using the UNM spectrometer were performed on a
252Cf spontaneous
fission source at UNM and
235U(n
th, f)X at the LANSCE Lujan Center neutron beamline facility located at Los Alamos National Laboratory. The results of the experimental mass and Z measurements for both
fission parent nuclides are compared to ENDF/B-VII
fission product yield data files for analysis and discussion. An assessment of statistical and mass related uncertainties and their contributors is also presented for
252Cf and
235U measurements. Finally, remaining issues and ideas for future work are identified and possible solutions proposed.
Advisors/Committee Members: Adam Hecht, Gary Cooper, Cassiano de Oliveira, Fredrik Tovesson.
Subjects/Keywords: Fission; Fission Yield; Fission Yield Measurements; Fission Products; Mass Spectroscopy; Nuclear Engineering
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Blakeley, R. E. (2018). Development of The University of New Mexico Spectrometer for High-Resolution Fission Product Yield Data. (Doctoral Dissertation). University of New Mexico. Retrieved from https://digitalrepository.unm.edu/ne_etds/76
Chicago Manual of Style (16th Edition):
Blakeley, Richard Emery. “Development of The University of New Mexico Spectrometer for High-Resolution Fission Product Yield Data.” 2018. Doctoral Dissertation, University of New Mexico. Accessed January 23, 2021.
https://digitalrepository.unm.edu/ne_etds/76.
MLA Handbook (7th Edition):
Blakeley, Richard Emery. “Development of The University of New Mexico Spectrometer for High-Resolution Fission Product Yield Data.” 2018. Web. 23 Jan 2021.
Vancouver:
Blakeley RE. Development of The University of New Mexico Spectrometer for High-Resolution Fission Product Yield Data. [Internet] [Doctoral dissertation]. University of New Mexico; 2018. [cited 2021 Jan 23].
Available from: https://digitalrepository.unm.edu/ne_etds/76.
Council of Science Editors:
Blakeley RE. Development of The University of New Mexico Spectrometer for High-Resolution Fission Product Yield Data. [Doctoral Dissertation]. University of New Mexico; 2018. Available from: https://digitalrepository.unm.edu/ne_etds/76
Uppsala University
5.
Lapinski, Felicia.
Experimental studies at CERN-nTOF of the 230Th(n,f) reaction.
Degree: Applied Nuclear Physics, 2020, Uppsala University
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-417867
► This work investigates the feasibility to perform an experiment at CERN n_TOF to study the fission cross section and fission fragment angular distribution (FFAD)…
(more)
▼ This work investigates the feasibility to perform an experiment at CERN n_TOF to study the fission cross section and fission fragment angular distribution (FFAD) of the 230Th(n,f) reaction. An analysis of fission fragment energy losses in the experimental target resulted in a choice of target thickness of 0.1 µm (100 µg/cm2 ), which yields good transmission out of the target at up to 45° emission angles from the target normal. A detection setup using ten PPAC detectors with nine thorium targets interleaved in between them was investigated, where the detectors and targets were tilted 45° with respect to the neutron beam. This makes it possible to measure all emission angles needed with respect to the neutron beam in order to determine the FFAD. For the experimental area EAR2 at n_TOF, a prediction of the count rate in the experiment resulted in low statistical uncertainties after a few weeks of beam time, which indicates that an experiment like this is feasible.
Detta projekt undersöker genomförbarheten av ett experiment vid CERN n_TOF för att mäta tvärsnittet och fördelningen av emissionsvinklar av fissionsfragment (FFAD) från 230Th(n,f)-reaktionen. En analys av energiförlusterna av fissionsfragment inuti torium-provet resulterade i en optimal provtjocklek på 0.1 µm (100 µg/cm2 ), vilket medför att fissionsfragment som emitteras i vinklar upp till 45° från provets normal har hög sannolikhet att transmitteras ut ur provet. En detektionsuppställning med tio PPAC-detektorer med nio toriumprov mellan dem undersöktes, där detektorerna och proven antogs vara snedställda med 45° från neutronstrålens riktning. Detta möjliggör detektion av fissionsfragment i alla vinklar som är nödvändiga för att kunna mäta hela FFAD. För experimentanläggningen EAR2 vid n_TOF, resulterade en uppskattning av antalet detekterade fissionsevent per sekund i låga mätosäkerheter efter ett par veckor av mättid, vilket antyder att experimentet är görbart.
Subjects/Keywords: fission; neutron induced fission; fission cross section; fission fragment angular distribution; thorium; Physical Sciences; Fysik
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lapinski, F. (2020). Experimental studies at CERN-nTOF of the 230Th(n,f) reaction. (Thesis). Uppsala University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-417867
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):
Lapinski, Felicia. “Experimental studies at CERN-nTOF of the 230Th(n,f) reaction.” 2020. Thesis, Uppsala University. Accessed January 23, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-417867.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lapinski, Felicia. “Experimental studies at CERN-nTOF of the 230Th(n,f) reaction.” 2020. Web. 23 Jan 2021.
Vancouver:
Lapinski F. Experimental studies at CERN-nTOF of the 230Th(n,f) reaction. [Internet] [Thesis]. Uppsala University; 2020. [cited 2021 Jan 23].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-417867.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lapinski F. Experimental studies at CERN-nTOF of the 230Th(n,f) reaction. [Thesis]. Uppsala University; 2020. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-417867
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Texas – Austin
6.
-7865-6558.
Advancements in coincidence counting experimental and analytical techniques for the quantitative detection of low-level isotopes relevant to non-proliferation activities in high dead-time applications.
Degree: MSin Engineering, Mechanical Engineering, 2015, University of Texas – Austin
URL: http://hdl.handle.net/2152/39131
► This thesis develops experimental and analytical procedures to detect trace amounts of isotopes of interest relevant to activities related to nuclear non-proliferation via γ-γ coincidence…
(more)
▼ This thesis develops experimental and analytical procedures to detect trace amounts of isotopes of interest relevant to activities related to nuclear non-proliferation via γ-γ coincidence counting. By using multiple-detector systems, the time-correlated nature of γ-ray emissions of isotopes with complex decay schemes can be utilized to reduce background levels and interferences. This thesis is divided into five major sections. After a review of the state-of-the-art, system capability is presented by documenting the quantitative determination of selenium in neutron-activated fly ash. The complex fly-ash γ spectrum containing multiple interferences and high background levels constitutes a rigorous quality-assurance test of system performance and further simulates the complex and difficult nature of
fission-product spectra relevant to non-proliferation activities. Next, this thesis maps out system dead-time performance and presents a methodology to correct for dead-time in coincidence systems. This thesis then presents the experimental analysis of
fission-product spectra generated via neutron activation in the TRIGA Mark II reactor at the University of Texas at Austin. Analytical procedures are presented to determine coincidence signatures and intensities, necessary for quantitative determination of any
fission product via Monte Carlo techniques. Finally, the system’s capability to quantify trace plutonium is examined, and a criterion is developed in order to determine the benefit of coincidence counting methodology for a specific isotope over standard nuclear counting techniques.
Advisors/Committee Members: Landsberger, Sheldon (advisor), Porterfield, Donivan R (committee member).
Subjects/Keywords: Coincidence; Fission-products
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
-7865-6558. (2015). Advancements in coincidence counting experimental and analytical techniques for the quantitative detection of low-level isotopes relevant to non-proliferation activities in high dead-time applications. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/39131
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-7865-6558. “Advancements in coincidence counting experimental and analytical techniques for the quantitative detection of low-level isotopes relevant to non-proliferation activities in high dead-time applications.” 2015. Masters Thesis, University of Texas – Austin. Accessed January 23, 2021.
http://hdl.handle.net/2152/39131.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-7865-6558. “Advancements in coincidence counting experimental and analytical techniques for the quantitative detection of low-level isotopes relevant to non-proliferation activities in high dead-time applications.” 2015. Web. 23 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-7865-6558. Advancements in coincidence counting experimental and analytical techniques for the quantitative detection of low-level isotopes relevant to non-proliferation activities in high dead-time applications. [Internet] [Masters thesis]. University of Texas – Austin; 2015. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/2152/39131.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-7865-6558. Advancements in coincidence counting experimental and analytical techniques for the quantitative detection of low-level isotopes relevant to non-proliferation activities in high dead-time applications. [Masters Thesis]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/39131
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
University of Texas – Austin
7.
Le, Aaron Kristopher.
Singlet exciton fission in perylenediimide thin films.
Degree: PhD, Chemistry, 2019, University of Texas – Austin
URL: http://dx.doi.org/10.26153/tsw/5864
► Singlet exciton fission (SF) is a process where a singlet exciton splits its energy with a neighboring molecule to form two lower energy triplet excitons.…
(more)
▼ Singlet exciton
fission (SF) is a process where a singlet exciton splits its energy with a neighboring molecule to form two lower energy triplet excitons. This is a process unique to organic molecules, and while intersystem crossing is typically slow in organic molecules due to small spin orbit coupling SF does not require a flip in spin to form these lower energy excitons and can occur on timescales extending from 10s of femtoseconds to nanoseconds. SF becomes efficient when the triplet energy is half of the energy of the singlet energy and occurs on timescales that outcompete deactivation pathways of the singlet exciton such as fluorescence. Efficient SF, or unity singlet to triplet interconversion via SF, has potential applications in improving the efficiencies of photovoltaic devices. Thermalization of high energy excitations in semiconductor photovoltaics pose a major loss channel for device efficiencies. An SF sensitizer can be incorporated into the device to absorb high energy excitations and following down conversion via SF to lower energy excitations thermalization losses can be mitigated. In this work we investigate SF in the perylenediimides (PDIs) in the solid state using ultrafast spectroscopy. The PDIs are deposited as polycrystalline thin films and structurally characterized to determine how the PDIs arrange in the thin films. SF is highly dependent on the intermolecular geometry of the of the participating chromophores, and the PDIs investigated in this work adopt different crystal structures in the solid state. This provides a platform to study the structure-function relationship of intermolecular geometry and SF. SF rates and triplet yield maxima are extracted from time-resolved emission and transient absorption spectroscopy with the aid of a kinetic models. The linear absorption and emission spectra suggest the singlet energy of the polycrystalline PDI films is lower than the monomeric PDIs due to aggregation. The potential disruption to the energetic requirement that the triplet energy be half the singlet would imply SF is an activated process in PDI thin films. We use a combination of temperature dependent time resolved emission and transient absorption spectroscopy to determine SF is endoergic in the PDI studied.
Advisors/Committee Members: Roberts, Sean T. (advisor), Vanden Bout, David A (committee member), Rose, Michael J (committee member), Baiz, Carlos R (committee member), Milliron, Delia J (committee member).
Subjects/Keywords: Singlet fission; Perylenediimide
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Le, A. K. (2019). Singlet exciton fission in perylenediimide thin films. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://dx.doi.org/10.26153/tsw/5864
Chicago Manual of Style (16th Edition):
Le, Aaron Kristopher. “Singlet exciton fission in perylenediimide thin films.” 2019. Doctoral Dissertation, University of Texas – Austin. Accessed January 23, 2021.
http://dx.doi.org/10.26153/tsw/5864.
MLA Handbook (7th Edition):
Le, Aaron Kristopher. “Singlet exciton fission in perylenediimide thin films.” 2019. Web. 23 Jan 2021.
Vancouver:
Le AK. Singlet exciton fission in perylenediimide thin films. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2019. [cited 2021 Jan 23].
Available from: http://dx.doi.org/10.26153/tsw/5864.
Council of Science Editors:
Le AK. Singlet exciton fission in perylenediimide thin films. [Doctoral Dissertation]. University of Texas – Austin; 2019. Available from: http://dx.doi.org/10.26153/tsw/5864
University of Rochester
8.
Henry, Eric M. (1985 - ).
A study of primary collision dynamics in
inverse-kinematics reaction of 78Kr on 40Ca at a bombarding energy
of 10 MeV per nucleon.
Degree: PhD, 2015, University of Rochester
URL: http://hdl.handle.net/1802/30064
► The CHIMERA multi-detector array at LNS Catania has been used to study the inverse-kinematics reaction of 78Kr + 40Ca at a bombarding energy of 10…
(more)
▼ The CHIMERA multi-detector array at LNS Catania has
been used to study the inverse-kinematics reaction of
78Kr + 40Ca at a
bombarding energy of 10 A MeV. The multi-detector is capable of
detecting individual products of the collision essential for the
reconstruction of the collision dynamics. This is the first time
CHIMERA has been used at low-energy, which offered a unique
challenge for the calibration and interpretation of experimental
data.
</br>
Initial interrogation of the
calibrated data revealed a class of selected events characterized
by two coincident heavy fragments (atomic number Z>3) that
together account for the majority of the total mass of the
colliding system. These events are consistent with the complete
fusion and subsequent binary split (fission) of a composite
nucleus. The observed fission fragments are characterized by a
broad A, Z distribution and are centered about symmetric fission
while exhibiting relative velocities significantly higher than
given by Viola systematics.
</br>
Additional
analysis of the kinematic relationship between the fission
fragments was performed. Of note, is that the center-of-mass
angular distribution (dσ/dΘ) of the fission fragments exhibits an
unexpected anisotropy inconsistent with a compound-nucleus
reaction. This anisotropy is indicative of a dynamic
fusion/fission-like process. The observed angular distribution
features a forward-backward anisotropy most prevalent for
mass-asymmetric events. Furthermore, the more massive fragment of
mass-asymmetric events appears to emerge preferentially in the
forward direction, along the beam axis. Analysis of the angular
distribution of alpha particles emitted from these fission
fragments suggests the events are associated mostly with central
collisions.
</br>
The observations associated
with this subset of events are similar to those reported for
dynamic fragmentation of projectile-like fragments, but have not
before been observed for a fusion/fission-like process. Comparisons
to dynamic and statistical reaction model predictions are
inconsistent with known phenomena, but suggest a peculiar
dynamics-driven scenario. A plausible explanation of the
experimental results is the existence of a phenomenon similar to a
“fusion window,” or a range of impact parameters in which complete
fusion cannot be achieved. In this scenario, the system must absorb
all the relative motion and convert it to vibrational energy or
heat. As the energy increases the system may not be able to
accommodate this conversion of energy without breaking
apart.
Subjects/Keywords: CHIMERA; Dynamic fission; Fusion window; ISODEC; Prompt fission; Shock fission
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Henry, E. M. (. -. ). (2015). A study of primary collision dynamics in
inverse-kinematics reaction of 78Kr on 40Ca at a bombarding energy
of 10 MeV per nucleon. (Doctoral Dissertation). University of Rochester. Retrieved from http://hdl.handle.net/1802/30064
Chicago Manual of Style (16th Edition):
Henry, Eric M (1985 - ). “A study of primary collision dynamics in
inverse-kinematics reaction of 78Kr on 40Ca at a bombarding energy
of 10 MeV per nucleon.” 2015. Doctoral Dissertation, University of Rochester. Accessed January 23, 2021.
http://hdl.handle.net/1802/30064.
MLA Handbook (7th Edition):
Henry, Eric M (1985 - ). “A study of primary collision dynamics in
inverse-kinematics reaction of 78Kr on 40Ca at a bombarding energy
of 10 MeV per nucleon.” 2015. Web. 23 Jan 2021.
Vancouver:
Henry EM(-). A study of primary collision dynamics in
inverse-kinematics reaction of 78Kr on 40Ca at a bombarding energy
of 10 MeV per nucleon. [Internet] [Doctoral dissertation]. University of Rochester; 2015. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1802/30064.
Council of Science Editors:
Henry EM(-). A study of primary collision dynamics in
inverse-kinematics reaction of 78Kr on 40Ca at a bombarding energy
of 10 MeV per nucleon. [Doctoral Dissertation]. University of Rochester; 2015. Available from: http://hdl.handle.net/1802/30064
NSYSU
9.
Luo, Yong-En.
Software Design of A Sequential Loop Optimization Method on Data Locality.
Degree: Master, Electrical Engineering, 2008, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0911108-205400
► The gap between processor speed and memory access performance increases continuingly. In order to improve performance degradation due to memory accesses, we can reduce memory…
(more)
▼ The gap between processor speed and memory access performance increases continuingly. In order to improve performance degradation due to memory accesses, we can reduce memory block accesses by improving data locality. In this research, we focus on optimizing data locality in loops. We adopt an iterative greedy algorithm. It iteratively perform loop
fission and loop fusion by moving strongly-connected components among loops
subject to data dependence constraints. It evaluates data locality change of each move and decide if accept such move. Subsequently loops can be improved gradually forward optimal result.
Advisors/Committee Members: Chia-Hsiung Kao (chair), Tsung Lee (committee member), Chih-Chien Chen (chair).
Subjects/Keywords: loop fission and loop fusion
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Luo, Y. (2008). Software Design of A Sequential Loop Optimization Method on Data Locality. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0911108-205400
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Luo, Yong-En. “Software Design of A Sequential Loop Optimization Method on Data Locality.” 2008. Thesis, NSYSU. Accessed January 23, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0911108-205400.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Luo, Yong-En. “Software Design of A Sequential Loop Optimization Method on Data Locality.” 2008. Web. 23 Jan 2021.
Vancouver:
Luo Y. Software Design of A Sequential Loop Optimization Method on Data Locality. [Internet] [Thesis]. NSYSU; 2008. [cited 2021 Jan 23].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0911108-205400.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Luo Y. Software Design of A Sequential Loop Optimization Method on Data Locality. [Thesis]. NSYSU; 2008. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0911108-205400
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université Paris-Sud – Paris XI
10.
Lemaître, Jean-François.
Etude des fragments de fission au point de scission avec le modèle SPY : Fission fragments study at scission point with SPY model.
Degree: Docteur es, Physique, 2015, Université Paris-Sud – Paris XI
URL: http://www.theses.fr/2015PA112214
► Bien que découverte il y a 75 ans, la fission nucléaire fait toujours l'objet de recherches. En effet, la compréhension de ce phénomène présente encore…
(more)
▼ Bien que découverte il y a 75 ans, la fission nucléaire fait toujours l'objet de recherches. En effet, la compréhension de ce phénomène présente encore des difficultés théoriques dues à sa complexité. Cela nécessite une bonne compréhension de la structure du noyau de l'atome ainsi qu'une description détaillée du mécanisme pilotant l'évolution du système fissionnant.Un nouveau modèle statistique, appelé SPY (Scission Point Yields), a été développé pour déterminer les caractéristiques des fragments (rendements de fission, énergie cinétique, énergie d¹excitation). Ce modèle est basé sur le modèle de Wilkins développé en 1976. Il consiste en une description statistique du processus de fission au point de scission où les fragments sont complètement définis. L'une des principales avancées du modèle SPY est l'introduction de la description microscopique de la structure nucléaire dans le calcul de l'énergie du système à la scission.Il permet d'étudier la relation entre les propriétés des fragments et leur structure nucléaire. Avec le modèle SPY, il est possible de calculer les propriétés des fragments et d'identifier les tendances globales pour environ 3000 noyaux fissionnants de Z=70 à Z=109, de la drip line neutron jusqu'à la drip line proton.Après une présentation générale de la version de référence du modèle SPY, les résultats obtenus pour la fission thermique de l'uranium 235 et la fission spontanée du californium 252 sont comparés aux données expérimentales. Une étude systématique sur l'ensemble des noyaux actuellement synthétisés est également menée avant d'étendre cette étude bien au-delà de la zone des noyaux synthétisables. Deux développements seront ensuite détaillés. Le premier concerne la manière de calculer l'énergie d'interaction coulombienne entre les deux fragments. Les distributions de charges issues de calculs microscopiques seront introduites afin d'améliorer le calcul de l'énergie d'interaction coulombienne. La possibilité de redéfinir le point de scission du système grâce à ces distributions de charge sera également discuté.Le deuxième développement porte sur le lien entre la modélisation du noyau et les observables associées aux fragments de fission. D'une part, différents modèles du noyau pour le calcul de l'énergie individuelle des fragments, tel que le modèle de la goutte liquide, seront envisagés et l'impact du choix de la modélisation du noyau sera étudiée.D'autre part, l'impact de la prise en compte de la structure nucléaire des fragments dans le calcul des densités d'états sur les observables sera étudié.
Although discovered 75 years ago, nuclear fission is still under investigation. Indeed, the understanding of this phenomenon still presents theoretical difficulties due to its complexity. This requires a good understanding of the structure of atomic nucleus and at the same time a detailed description of the mechanisms driving the evolution of a fissioning system.A new statistical scission point model named SPY (Scission Point Yields) is developped to model the fission mechanism and determine…
Advisors/Committee Members: Sida, Jean-Luc (thesis director).
Subjects/Keywords: Fission; Point de scission; Fragment; HFB; Statistique; Rendements de fission; Fission; Scission point; Fragment; HFB; Statistical; Fission yields
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lemaître, J. (2015). Etude des fragments de fission au point de scission avec le modèle SPY : Fission fragments study at scission point with SPY model. (Doctoral Dissertation). Université Paris-Sud – Paris XI. Retrieved from http://www.theses.fr/2015PA112214
Chicago Manual of Style (16th Edition):
Lemaître, Jean-François. “Etude des fragments de fission au point de scission avec le modèle SPY : Fission fragments study at scission point with SPY model.” 2015. Doctoral Dissertation, Université Paris-Sud – Paris XI. Accessed January 23, 2021.
http://www.theses.fr/2015PA112214.
MLA Handbook (7th Edition):
Lemaître, Jean-François. “Etude des fragments de fission au point de scission avec le modèle SPY : Fission fragments study at scission point with SPY model.” 2015. Web. 23 Jan 2021.
Vancouver:
Lemaître J. Etude des fragments de fission au point de scission avec le modèle SPY : Fission fragments study at scission point with SPY model. [Internet] [Doctoral dissertation]. Université Paris-Sud – Paris XI; 2015. [cited 2021 Jan 23].
Available from: http://www.theses.fr/2015PA112214.
Council of Science Editors:
Lemaître J. Etude des fragments de fission au point de scission avec le modèle SPY : Fission fragments study at scission point with SPY model. [Doctoral Dissertation]. Université Paris-Sud – Paris XI; 2015. Available from: http://www.theses.fr/2015PA112214
Oregon State University
11.
Groening, Hugo Rafael.
The structure of the fission transition nucleus ²²⁷Ra.
Degree: PhD, Chemistry, 1973, Oregon State University
URL: http://hdl.handle.net/1957/44806
Subjects/Keywords: Nuclear fission
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Groening, H. R. (1973). The structure of the fission transition nucleus ²²⁷Ra. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/44806
Chicago Manual of Style (16th Edition):
Groening, Hugo Rafael. “The structure of the fission transition nucleus ²²⁷Ra.” 1973. Doctoral Dissertation, Oregon State University. Accessed January 23, 2021.
http://hdl.handle.net/1957/44806.
MLA Handbook (7th Edition):
Groening, Hugo Rafael. “The structure of the fission transition nucleus ²²⁷Ra.” 1973. Web. 23 Jan 2021.
Vancouver:
Groening HR. The structure of the fission transition nucleus ²²⁷Ra. [Internet] [Doctoral dissertation]. Oregon State University; 1973. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1957/44806.
Council of Science Editors:
Groening HR. The structure of the fission transition nucleus ²²⁷Ra. [Doctoral Dissertation]. Oregon State University; 1973. Available from: http://hdl.handle.net/1957/44806
Oregon State University
12.
Liaw, Jye Ren.
Primary fission fragment yields and prompt-neutron emissions for after-heat analysis.
Degree: PhD, Nuclear Engineering, 1975, Oregon State University
URL: http://hdl.handle.net/1957/45420
► Independent fission product yields are primary input nuclear data in the evaluation of nuclear reactor after-heat when using a nuclide-decay summation method. The error in…
(more)
▼ Independent
fission product yields are primary input nuclear
data in the evaluation of nuclear reactor after-heat when using a
nuclide-decay summation method. The error in yield values is one
of the major causes of uncertainty of this calculation. Since only
a small fraction of the
fission product yields has been measured
directly, the adoption of model-predicted unknown yields is inevitable.
The uncertainty involved is usually quite large.
This dissertation presents a systematic approach to correlating
the relevant experimental and calculated ²³⁵U thermal
fission
data with other nuclear data, so that with application constraints
from exact physical laws, a consistent set of primary
fission fragment
yields can be generated. These are for use in improving the
precision of after-heat calculations by constraining yield errors
and thereby reducing the uncertainties caused by them.
Fission fragment kinetic energy data and nuclear mass table
data are used to calculate the total excitation energy of a fragment
pair. This energy is partitioned between light and heavy fragments
assuming equal temperature of the fragments at the time of scission.
The prompt de-excitation of the primary
fission fragment via neutron
and gamma ray emissions is simulated by nuclear evaporation processes.
A FORTRAN IV Monte Carlo Code called EVAPOR was developed for this
purpose. Neutron yields and emission probabilities for various numbers
of neutrons from over 1,000 possible
fission fragments were
generated by EVAPOR.
The major uncertainties of the emission probabilities calculated
by EVAPOR can be simulated by lumping them together as though they
were the result of uncertainties in the mean excitation energy of a
fission fragment. A sensitivity study of the effect of this uncertainty
thus permits an a priori estimate of emission probability
error. The resulting emission probabilities and their errors can
then be used as an input for inference of primary fragment yields.
This inference, a form of probabilistic data unfolding, has
been explored for a sample case. Results to date have shown that a
consistent set of primary (before neutron emission) and secondary
(after neutron emission) yields can be generated using combined data
for light and heavy fragments of complementary charge number. However,
there are significant discrepancies between the secondary
yields obtained by this process and those used as input to it, which
stem from the ENDF/B-IV evaluation. The sources of these discrepancies
must still be explored.
Advisors/Committee Members: Spinrad, Bernard I (advisor), Binney, Stephen E. (committee member).
Subjects/Keywords: Fission products
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Liaw, J. R. (1975). Primary fission fragment yields and prompt-neutron emissions for after-heat analysis. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/45420
Chicago Manual of Style (16th Edition):
Liaw, Jye Ren. “Primary fission fragment yields and prompt-neutron emissions for after-heat analysis.” 1975. Doctoral Dissertation, Oregon State University. Accessed January 23, 2021.
http://hdl.handle.net/1957/45420.
MLA Handbook (7th Edition):
Liaw, Jye Ren. “Primary fission fragment yields and prompt-neutron emissions for after-heat analysis.” 1975. Web. 23 Jan 2021.
Vancouver:
Liaw JR. Primary fission fragment yields and prompt-neutron emissions for after-heat analysis. [Internet] [Doctoral dissertation]. Oregon State University; 1975. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1957/45420.
Council of Science Editors:
Liaw JR. Primary fission fragment yields and prompt-neutron emissions for after-heat analysis. [Doctoral Dissertation]. Oregon State University; 1975. Available from: http://hdl.handle.net/1957/45420
Oregon State University
13.
Shum, Yin-sang.
Isomeric cross-section ratios of Cd¹¹⁵ and Cs¹³⁴ for charged particle induced fission.
Degree: MS, Chemistry, 1971, Oregon State University
URL: http://hdl.handle.net/1957/46162
Subjects/Keywords: Nuclear fission
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Shum, Y. (1971). Isomeric cross-section ratios of Cd¹¹⁵ and Cs¹³⁴ for charged particle induced fission. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/46162
Chicago Manual of Style (16th Edition):
Shum, Yin-sang. “Isomeric cross-section ratios of Cd¹¹⁵ and Cs¹³⁴ for charged particle induced fission.” 1971. Masters Thesis, Oregon State University. Accessed January 23, 2021.
http://hdl.handle.net/1957/46162.
MLA Handbook (7th Edition):
Shum, Yin-sang. “Isomeric cross-section ratios of Cd¹¹⁵ and Cs¹³⁴ for charged particle induced fission.” 1971. Web. 23 Jan 2021.
Vancouver:
Shum Y. Isomeric cross-section ratios of Cd¹¹⁵ and Cs¹³⁴ for charged particle induced fission. [Internet] [Masters thesis]. Oregon State University; 1971. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1957/46162.
Council of Science Editors:
Shum Y. Isomeric cross-section ratios of Cd¹¹⁵ and Cs¹³⁴ for charged particle induced fission. [Masters Thesis]. Oregon State University; 1971. Available from: http://hdl.handle.net/1957/46162
Oregon State University
14.
Wu, Chi Hung.
Average beta and gamma decay energies of the fission products.
Degree: PhD, Nuclear Engineering, 1978, Oregon State University
URL: http://hdl.handle.net/1957/42619
Subjects/Keywords: Fission products
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wu, C. H. (1978). Average beta and gamma decay energies of the fission products. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/42619
Chicago Manual of Style (16th Edition):
Wu, Chi Hung. “Average beta and gamma decay energies of the fission products.” 1978. Doctoral Dissertation, Oregon State University. Accessed January 23, 2021.
http://hdl.handle.net/1957/42619.
MLA Handbook (7th Edition):
Wu, Chi Hung. “Average beta and gamma decay energies of the fission products.” 1978. Web. 23 Jan 2021.
Vancouver:
Wu CH. Average beta and gamma decay energies of the fission products. [Internet] [Doctoral dissertation]. Oregon State University; 1978. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1957/42619.
Council of Science Editors:
Wu CH. Average beta and gamma decay energies of the fission products. [Doctoral Dissertation]. Oregon State University; 1978. Available from: http://hdl.handle.net/1957/42619
15.
Yan, Yiman.
Study of fission of exotic actinides by relativistic reactions : Étude de la fission d'actinides exotiques par réaction relativiste.
Degree: Docteur es, Structure et réactions nucléaires, 2016, Université Paris-Saclay (ComUE)
URL: http://www.theses.fr/2016SACLS258
► SOFIA (Studies On FIssion with Aladin) est un programme expérimental innovant qui a pour objectif la mesure de plusieurs observables de la fission nucléaire :…
(more)
▼ SOFIA (Studies On FIssion with Aladin) est un programme expérimental innovant qui a pour objectif la mesure de plusieurs observables de la fission nucléaire : les taux de production isotopiques des fragments de fission, l'énergie cinétique totale des fragments, et la multiplicité des neutrons prompts. Ces informations sont obtenues pour une large variété d'actinides et de pré-actinides. Le recours à la cinématique inverse (le système fissionnant est le faisceau et non pas la cible) est le seul moyen d'identifier les fragments à la fois en charge et en masse. Le travail de doctorat présenté dans cette thèse porte sur l'expérience menée en Octobre 2014 et dédiée à la mesure de la fission de ² ³ ⁶ U induite par excitation coulombienne, soit l'analogue de la fission de ² ³⁵U induite par neutron.Les expériences SOFIA ont lieu à GSI (Darmstadt, Allemagne), la seule installation au monde capable de délivrer un faisceau d'uranium ² ³⁸ de 1 GeV par nucléon. Ce faisceau primaire subit une première fragmentation, dont les produits sont sélectionnés par le FRS (FRagment Separator) afin de former un faisceau secondaire du noyau d'intérêt, en l'occurrence ² ³ ⁶ U, qui est guidé vers l'expérience SOFIA où sa fission est déclenchée.Certains noyaux proches de ² ³ ⁶ U sont également transmis par le FRS : il est donc nécessaire de procéder à l'identification en masse et en charge du système fissionnant, puis d'identifier les deux fragments de fission. Dans les deux cas, l'identification, réalisée événement par événement, repose sur la mesure simultanée de la perte d'énergie dans un gaz, de la rigidité magnétique et du temps de vol. Seules les fissions induites par excitation coulombiennes sont pertinentes : la contribution des réactions nucléaires à la production des fragments doit donc être mesurée et soustraite.L'analyse présentée dans ce document inclut l'identification du faisceau secondaire en masse et en charge, l'identification en charge des fragments de fission, l'estimation de la contribution des réactions nucléaires, et finalement les taux de production des éléments obtenus dans la fission de ² ³ ⁶ U. Ces résultats sont comparés à ceux d'autres mesures réalisées sur SOFIA, et à des résultats antérieurs obtenus par d'autres techniques.
SOFIA (Studies On FIssion with Aladin) is an innovative experimental program which aims to measure several fission observables — the isotopic fission yields, the total kinetic energy of the fragments and the prompt neutron multiplicity, for a wide range of actinides and pre-actinides. The use of inverse kinematics (the fissioning system is the beam instead of the target) is the only way to fully identify fragments in charge and mass. The PhD work presented in this thesis concerns the experiment conducted in October 2014, and is focused on the Coulomb-induced fission of ² ³ ⁶ U, which can be regarded as the analog of the neutron-induced fission of ² ³⁵U.The SOFIA experiments take place in GSI (Darmstadt, Germany) because it is the sole facility in the world which delivers a beam of ² ³⁸U at 1…
Advisors/Committee Members: Jacquet, Dominique (thesis director).
Subjects/Keywords: Fission; Cinématique inverse; Taux de production des fragments de fission; Fission; Inverse kinematics; Fission fragment yield
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Yan, Y. (2016). Study of fission of exotic actinides by relativistic reactions : Étude de la fission d'actinides exotiques par réaction relativiste. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2016SACLS258
Chicago Manual of Style (16th Edition):
Yan, Yiman. “Study of fission of exotic actinides by relativistic reactions : Étude de la fission d'actinides exotiques par réaction relativiste.” 2016. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed January 23, 2021.
http://www.theses.fr/2016SACLS258.
MLA Handbook (7th Edition):
Yan, Yiman. “Study of fission of exotic actinides by relativistic reactions : Étude de la fission d'actinides exotiques par réaction relativiste.” 2016. Web. 23 Jan 2021.
Vancouver:
Yan Y. Study of fission of exotic actinides by relativistic reactions : Étude de la fission d'actinides exotiques par réaction relativiste. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2016. [cited 2021 Jan 23].
Available from: http://www.theses.fr/2016SACLS258.
Council of Science Editors:
Yan Y. Study of fission of exotic actinides by relativistic reactions : Étude de la fission d'actinides exotiques par réaction relativiste. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2016. Available from: http://www.theses.fr/2016SACLS258
McGill University
16.
Leger, Francis John.
Some fission products of furans and lignin.
Degree: PhD, Department of Chemistry, 1938, McGill University
URL: https://escholarship.mcgill.ca/downloads/j098zf14f.pdf
;
https://escholarship.mcgill.ca/concern/theses/sf268821h
► The discovery of Furoic acid as a pyrolysis product of Mucic acid by Scheele 1) in 1780, opened up a ·complex and extremely interesting field…
(more)
▼ The discovery of Furoic acid as a pyrolysis product of Mucic acid by Scheele 1) in 1780, opened up a ·complex and extremely interesting field or chemistry. In spite of the early discovery of furans, knowledge of this particular branch of organic chemistry is still very limited. Most attempts at determination of structure by substitution and addition reactions have failed, since furan and substituted furans are highly sensitive to the action of mineral acids. In most cases,these bring about the formation of tars, resins and heavy olls of such complex structures that it has been impossible as yet, to determine their nature. The sensitivity of the furan Qampounds depends upon the nature of substituent groups, and as. one consequence, considerable work has been carried out on the more stable furoic acid.[...]
Advisors/Committee Members: Hibbert, H. (Supervisor).
Subjects/Keywords: Fission products
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Leger, F. J. (1938). Some fission products of furans and lignin. (Doctoral Dissertation). McGill University. Retrieved from https://escholarship.mcgill.ca/downloads/j098zf14f.pdf ; https://escholarship.mcgill.ca/concern/theses/sf268821h
Chicago Manual of Style (16th Edition):
Leger, Francis John. “Some fission products of furans and lignin.” 1938. Doctoral Dissertation, McGill University. Accessed January 23, 2021.
https://escholarship.mcgill.ca/downloads/j098zf14f.pdf ; https://escholarship.mcgill.ca/concern/theses/sf268821h.
MLA Handbook (7th Edition):
Leger, Francis John. “Some fission products of furans and lignin.” 1938. Web. 23 Jan 2021.
Vancouver:
Leger FJ. Some fission products of furans and lignin. [Internet] [Doctoral dissertation]. McGill University; 1938. [cited 2021 Jan 23].
Available from: https://escholarship.mcgill.ca/downloads/j098zf14f.pdf ; https://escholarship.mcgill.ca/concern/theses/sf268821h.
Council of Science Editors:
Leger FJ. Some fission products of furans and lignin. [Doctoral Dissertation]. McGill University; 1938. Available from: https://escholarship.mcgill.ca/downloads/j098zf14f.pdf ; https://escholarship.mcgill.ca/concern/theses/sf268821h
Simon Fraser University
17.
Blok, Hendrik Pieter Willem Lodewijk.
Fission of medium mass nuclei.
Degree: Simon Fraser University
URL: http://summit.sfu.ca/item/4378
Subjects/Keywords: Nuclear fission.
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Blok, H. P. W. L. (n.d.). Fission of medium mass nuclei. (Thesis). Simon Fraser University. Retrieved from http://summit.sfu.ca/item/4378
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Blok, Hendrik Pieter Willem Lodewijk. “Fission of medium mass nuclei.” Thesis, Simon Fraser University. Accessed January 23, 2021.
http://summit.sfu.ca/item/4378.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Blok, Hendrik Pieter Willem Lodewijk. “Fission of medium mass nuclei.” Web. 23 Jan 2021.
Note: this citation may be lacking information needed for this citation format:
No year of publication.
Vancouver:
Blok HPWL. Fission of medium mass nuclei. [Internet] [Thesis]. Simon Fraser University; [cited 2021 Jan 23].
Available from: http://summit.sfu.ca/item/4378.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.
Council of Science Editors:
Blok HPWL. Fission of medium mass nuclei. [Thesis]. Simon Fraser University; Available from: http://summit.sfu.ca/item/4378
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
No year of publication.
Colorado School of Mines
18.
Howard, Cameron Tyler.
Behavior of palladium as a getter for lanthanide fission products in U-Mo-Ti-Zr fast reactor fuels, The.
Degree: PhD, Metallurgical and Materials Engineering, 2017, Colorado School of Mines
URL: http://hdl.handle.net/11124/171847
► One of the hurdles to extending the life of metallic fast reactor fuel alloys is Fuel-Clad Chemical Interaction (FCCI), a phenomenon which occurs between fuel…
(more)
▼ One of the hurdles to extending the life of metallic fast reactor fuel alloys is Fuel-Clad Chemical Interaction (FCCI), a phenomenon which occurs between fuel and cladding resulting in thinning of the cladding. The cause of FCCI is the reaction between cladding constituents (e.g. iron and nickel) and lanthanide
fission products generated in the fuel (e.g. lanthanum and cerium). This interaction can produce localized melting of the cladding, reducing its thickness over the life of the fuel element. It has been suggested that FCCI can be hindered by doping the fuel with palladium, a candidate getter for lanthanide
fission products. There is therefore interest in demonstrating the efficacy of this particular lanthanide getter for realistic fast reactor fuel analogues. Work is presented based on the U-M (M=50Mo-43Ti-7Zr, wt. pct.) alloy system both with, and without, palladium additions. The research was conducted using depleted uranium alloys developed as metallurgical surrogates for real spent fuels. Burnup was simulated using cerium as a mock lanthanide
fission product to assess the behavior of palladium with respect to fuel and cladding constituents. The behavior of palladium in terms of microstructural evolution was studied from both as-cast and annealed surrogate fuel specimens as well as diffusion couples between surrogate fuel alloys and type HT-9 stainless steel cladding. Results derived from characterization of these metallurgical surrogate experiments are presented and it is shown that palladium is a promising getter for lanthanide
fission products in the given alloy system.
Advisors/Committee Members: Mishra, Brajendra (advisor), Olson, D. L. (David LeRoy) (advisor), Porter, Jason M. (committee member), Liu, Stephen (committee member), King, Jeffrey C. (committee member), Paglieri, Stephen N. (committee member).
Subjects/Keywords: lanthanide; reactor; fission; uranium; palladium
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Howard, C. T. (2017). Behavior of palladium as a getter for lanthanide fission products in U-Mo-Ti-Zr fast reactor fuels, The. (Doctoral Dissertation). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/171847
Chicago Manual of Style (16th Edition):
Howard, Cameron Tyler. “Behavior of palladium as a getter for lanthanide fission products in U-Mo-Ti-Zr fast reactor fuels, The.” 2017. Doctoral Dissertation, Colorado School of Mines. Accessed January 23, 2021.
http://hdl.handle.net/11124/171847.
MLA Handbook (7th Edition):
Howard, Cameron Tyler. “Behavior of palladium as a getter for lanthanide fission products in U-Mo-Ti-Zr fast reactor fuels, The.” 2017. Web. 23 Jan 2021.
Vancouver:
Howard CT. Behavior of palladium as a getter for lanthanide fission products in U-Mo-Ti-Zr fast reactor fuels, The. [Internet] [Doctoral dissertation]. Colorado School of Mines; 2017. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/11124/171847.
Council of Science Editors:
Howard CT. Behavior of palladium as a getter for lanthanide fission products in U-Mo-Ti-Zr fast reactor fuels, The. [Doctoral Dissertation]. Colorado School of Mines; 2017. Available from: http://hdl.handle.net/11124/171847
University of Utah
19.
Guo, Qian.
The functional analysis of mitochondrial fission adaptors in yeast and human.
Degree: PhD, Biochemistry, 2012, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3455/rec/2531
► The mitochondrion is an essential organelle in eukaryotic cells and organisms. This compartment is responsible for many important cellular activities. In many cell types, healthy…
(more)
▼ The mitochondrion is an essential organelle in eukaryotic cells and organisms. This compartment is responsible for many important cellular activities. In many cell types, healthy mitochondria are branched and form tubular networks that spread evenly throughout the cytoplasm. The balance of mitochondrial fission, fusion and movement is required to maintain this morphology and proper mitochondrial functions. Recent studies suggest that disruption of mitochondria dynamics is associated with metabolic and neurodegenerative diseases. This dissertation interrogates the function of mitochondrial fission adaptors using Saccharomyces cerevisiae as a model system and research tool.Mitochondrial fission is mediated by protein complexes that encircle and divide mitochondrial tubules. In budding yeast, fission requires the membrane-anchored protein Fis1 and the dynamin-related GTPase Dnm1. Dnm1 is recruited to mitochondria via interactions with the adaptor proteins Caf4 and Mdv1, which bind directly to the mitochondrial outer membrane protein Fis1. Unlike Mdv1, a function for Caf4 in fission has not been established. In Chapter 2, I demonstrate that Caf4 is a bona fide adaptor that assembles at mitochondrial division sites. Fission complexes may contain Caf4 alone or both Caf4 and Mdv1 without compromising fission function. Furthermore, despite correspondence between Caf4 and Mdv1 expression levels, functional and phylogenetic analyses indicate that Caf4 mitochondrial fission activity has diverged from that of Mdv1.In mammals, mitochondrial fission is mediated by the dynamin-related GTPase Drp1, which is recruited to mitochondrial surface by additional membrane-associated adaptor proteins (hFis1, Mff and MiDs). In Chapter 3, a yeast strain lacking all fission proteins is used to identify whether these adaptors is able to participate in both membrane scission and GTPase recruitment. While hFis1 is dispensable for fission, membrane-anchored Mff or MiDs paired with Drp1 are sufficient to divide mitochondria. In addition, Drp1 coassembled with MiDs in vitro forms a heteropolymer that alters Drp1 homopolymer structure with a narrower diameter. It is the first demonstration that an adaptor protein alters the architecture of a mitochondrial dynamin GTPase polymer in a manner that could facilitate membrane constriction and severing activity. Altogether, these studies advance our understanding of the multiple adaptors that function in yeast and mammalian mitochondrial fission complexes.
Subjects/Keywords: Fission complex adaptor; Mammalian; Mitochondrial fission; Paralog; Yeast
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Guo, Q. (2012). The functional analysis of mitochondrial fission adaptors in yeast and human. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3455/rec/2531
Chicago Manual of Style (16th Edition):
Guo, Qian. “The functional analysis of mitochondrial fission adaptors in yeast and human.” 2012. Doctoral Dissertation, University of Utah. Accessed January 23, 2021.
http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3455/rec/2531.
MLA Handbook (7th Edition):
Guo, Qian. “The functional analysis of mitochondrial fission adaptors in yeast and human.” 2012. Web. 23 Jan 2021.
Vancouver:
Guo Q. The functional analysis of mitochondrial fission adaptors in yeast and human. [Internet] [Doctoral dissertation]. University of Utah; 2012. [cited 2021 Jan 23].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3455/rec/2531.
Council of Science Editors:
Guo Q. The functional analysis of mitochondrial fission adaptors in yeast and human. [Doctoral Dissertation]. University of Utah; 2012. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3455/rec/2531
Texas A&M University
20.
Guy, Troy Lamar.
Analysis of Advanced Actinide-Fueled Energy Systems for Deep Space Propulsion Applications.
Degree: MS, Nuclear Engineering, 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7416
► The present study is focused on evaluating higher actinides beyond uranium that are capable of supporting power and propulsion requirements in robotic deep space and…
(more)
▼ The present study is focused on evaluating higher actinides beyond uranium that are capable of supporting power and propulsion requirements in robotic deep space and interstellar exploration. The central technology in this thesis is based on utilizing advanced actinides for direct
fission fragment energy conversion coupled with magnetic collimation. Critical
fission configurations are explored which are based on
fission fragment energy conversion utilizing a nano-scale layer of the metastable isotope 242mAm coated on carbon fibers. A 3-D computational model of the reactor core is developed and neutron properties are presented.
Fission neutron yield, exceptionally high thermal
fission cross sections, high
fission fragment kinetic energy and relatively low radiological emission properties are identified as promising features of 242mAm as a
fission fragment source. The isotopes 249Cf and 251Cf are found to be promising candidates for future studies. Conceptual system integration, deep space mission applicability and recommendations for future experimental development are introduced.
Advisors/Committee Members: Tsvetkov, Pavel V. (advisor), Suntzeff, Nicholas B. (committee member), Bragg-Sitton, Shannon M. (committee member).
Subjects/Keywords: actinide; deep space; propulsion; americium; fission; fission fragments
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Guy, T. L. (2011). Analysis of Advanced Actinide-Fueled Energy Systems for Deep Space Propulsion Applications. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7416
Chicago Manual of Style (16th Edition):
Guy, Troy Lamar. “Analysis of Advanced Actinide-Fueled Energy Systems for Deep Space Propulsion Applications.” 2011. Masters Thesis, Texas A&M University. Accessed January 23, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7416.
MLA Handbook (7th Edition):
Guy, Troy Lamar. “Analysis of Advanced Actinide-Fueled Energy Systems for Deep Space Propulsion Applications.” 2011. Web. 23 Jan 2021.
Vancouver:
Guy TL. Analysis of Advanced Actinide-Fueled Energy Systems for Deep Space Propulsion Applications. [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7416.
Council of Science Editors:
Guy TL. Analysis of Advanced Actinide-Fueled Energy Systems for Deep Space Propulsion Applications. [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7416
North-West University
21.
Molokwane, Pulane.
Development of a code for the calculation of the release of gaseous fission products and iodine from a pebble bed modular reactor / Pulane Molokwane
.
Degree: 2003, North-West University
URL: http://hdl.handle.net/10394/11311
► This dissertation entails the calculation of the release of gaseous fission products and iodine from the Pebble Bed modular reactor (PBMR) 400MW core under a…
(more)
▼ This dissertation entails the calculation of the release of gaseous fission products and iodine from the Pebble Bed modular reactor (PBMR) 400MW core under a Depressurised Loss of Forced Coolant (DLOFC), where the temperature history of fuel sphere is taken into account. The release is calculated by developing a computer code (REALESE) based on a simple coated particle failure and a gas diffusion model. The computer code calculates failure fraction, kernel release fraction, layer release, Iodine decay correction, core release fraction and other parameters pertaining to a PBMR. This source code is developed in the FORTRAN 77 programming language on a Compaq Virtual FORTRAN Development Platform. Verification of the results is done in Mathcad and the Getter code. RELEASE calculations compare very well with the MathCAD calculations with deviation from 0-5%. The effects of a number of parameters on fission product release are investigated by means of sensitivity analysis involving parameters like temperature, failure fraction and diffusion coefficient. Sensitivity analysis showed that the variation of failure fraction has the greatest effect on release fission products in a PMBR. The RELEASE results are compared with GETTER calculations in addition to the MathCAD verification. RELEASE calculations showed an expected value of 2.00x10 12 Bq whereas GETTER calculations produced an expected value of 2.13x10 12 Bq, representing a percentage deviation of 6%.
Subjects/Keywords: Fission gasses;
Fission products;
Iodine
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Molokwane, P. (2003). Development of a code for the calculation of the release of gaseous fission products and iodine from a pebble bed modular reactor / Pulane Molokwane
. (Thesis). North-West University. Retrieved from http://hdl.handle.net/10394/11311
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):
Molokwane, Pulane. “Development of a code for the calculation of the release of gaseous fission products and iodine from a pebble bed modular reactor / Pulane Molokwane
.” 2003. Thesis, North-West University. Accessed January 23, 2021.
http://hdl.handle.net/10394/11311.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Molokwane, Pulane. “Development of a code for the calculation of the release of gaseous fission products and iodine from a pebble bed modular reactor / Pulane Molokwane
.” 2003. Web. 23 Jan 2021.
Vancouver:
Molokwane P. Development of a code for the calculation of the release of gaseous fission products and iodine from a pebble bed modular reactor / Pulane Molokwane
. [Internet] [Thesis]. North-West University; 2003. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/10394/11311.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Molokwane P. Development of a code for the calculation of the release of gaseous fission products and iodine from a pebble bed modular reactor / Pulane Molokwane
. [Thesis]. North-West University; 2003. Available from: http://hdl.handle.net/10394/11311
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
22.
Chen, Yonghao.
Characterization of the New Neutron Line at CERN-n_TOF and Study of the Neutron-induced Fission of 237Np : Caractérisation de la nouvelle ligne de neutrons à n_TOF-CERN, et étude de la fission induite par neutrons de 237Np.
Degree: Docteur es, Énergie nucléaire, 2017, Université Paris-Saclay (ComUE)
URL: http://www.theses.fr/2017SACLS204
► L’installation n_TOF au CERN est unesource pulsée de neutrons, unique au monde pour lamesure de données nucléaires sur le spectre enénergie le plus étendu, avec…
(more)
▼ L’installation n_TOF au CERN est unesource pulsée de neutrons, unique au monde pour lamesure de données nucléaires sur le spectre enénergie le plus étendu, avec deux lignesactuellement exploitées. Une ligne horizontalealimente l’aire expérimentale 1 (EAR-1) avec unebase de vol de ~185 mètres. La seconde ligne estverticale et alimente l’aire 2 (EAR-2) à ~20 mètresde la cible de productionLa première partie de ce travail de thèse concernela caractérisation du faisceau de neutrons (flux,profil géométrique, spectre en énergie) de lanouvelle ligne EAR-2, particulièrement importantepour la définition des expériences et leur analyse.Une mesure a été réalisée à EAR-2, basée sur desdétecteurs PPAC enregistrant la fission de 235U, àpartir de laquelle nous avons obtenu le profil et leflux sur la gamme en énergie accessible (thermiqueà 200 MeV).La seconde partie de la thèse a pour but l’étudede la fission de 237Np. Cet isotope est abondammentproduit dans les réacteurs nucléaires actuels et estun des constituants des déchets à vie longue. A cetitre on peut le considérer comme une ciblepotentielle pour l’incinération en réacteur rapide.Ceci a motivé des mesures récentes de sa sectionefficace de fission. Cependant des déviationsimportantes sont apparues, en particulier la mesureeffectuée à n_TOF en 2010 est 6% supérieure auxévaluations basées sur les mesures antérieures. Cecia motivé une nouvelle mesure à n_TOF avec uneconfiguration permettant une mesure précise del’efficacité de détection, pour apporter une réponseau problème. Ce travail a permis de mettre enévidence une dépendance de l’efficacité dedétection avec l’élément, résultant des conditions del’électrodéposition. Après application de cettecorrection d’efficacité dans la région 1 à 5 MeV lasection efficace de fission ainsi extraite est 2 à 3%plus petite par rapport à la mesure de 2010,cependant elle reste 3 à 4% plus forte que lesévaluations
The neutron time-of-flight (n_TOF)facility at CERN is a unique worldwide pulsedneutron source to measure the nuclear data over thewidest energy range with two beam lines currentlyexploited. One is horizontal with a ~185 metersflight path, sending neutrons to experimental area-1(EAR-1). The second one is a new line sendingneutrons vertically to experimental area-2 (EAR-2)with a ~20 meters flight path.The first part of this PhD work is dedicated to thecharacterization of the beam (flux, geometricalprofile, energy spectrum) of the new EAR-2 neutronbeam, of the utmost importance for the experimentalproposals and analyses. An experiment was carriedout at EAR-2, based on PPAC detectors looking atfission of 235U, and the beam profile and neutronflux have been obtained for the entire availableenergy range (from thermal to 200 MeV).The second part of the thesis aims to study theneutron-induced fission of 237Np. 237Np isabundantly produced in present nuclear reactor andis one of the major long-lived components ofnuclear waste which can be considered as apotential target of incineration in fast neutronreactors. Consequently its neutron-induced…
Advisors/Committee Members: Tassan-Got, Laurent (thesis director).
Subjects/Keywords: Fission; Neutron; Détecteur gazeux; N_tof; Fission; Neutron; Gaseous detector; N_tof
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, Y. (2017). Characterization of the New Neutron Line at CERN-n_TOF and Study of the Neutron-induced Fission of 237Np : Caractérisation de la nouvelle ligne de neutrons à n_TOF-CERN, et étude de la fission induite par neutrons de 237Np. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2017SACLS204
Chicago Manual of Style (16th Edition):
Chen, Yonghao. “Characterization of the New Neutron Line at CERN-n_TOF and Study of the Neutron-induced Fission of 237Np : Caractérisation de la nouvelle ligne de neutrons à n_TOF-CERN, et étude de la fission induite par neutrons de 237Np.” 2017. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed January 23, 2021.
http://www.theses.fr/2017SACLS204.
MLA Handbook (7th Edition):
Chen, Yonghao. “Characterization of the New Neutron Line at CERN-n_TOF and Study of the Neutron-induced Fission of 237Np : Caractérisation de la nouvelle ligne de neutrons à n_TOF-CERN, et étude de la fission induite par neutrons de 237Np.” 2017. Web. 23 Jan 2021.
Vancouver:
Chen Y. Characterization of the New Neutron Line at CERN-n_TOF and Study of the Neutron-induced Fission of 237Np : Caractérisation de la nouvelle ligne de neutrons à n_TOF-CERN, et étude de la fission induite par neutrons de 237Np. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2017. [cited 2021 Jan 23].
Available from: http://www.theses.fr/2017SACLS204.
Council of Science Editors:
Chen Y. Characterization of the New Neutron Line at CERN-n_TOF and Study of the Neutron-induced Fission of 237Np : Caractérisation de la nouvelle ligne de neutrons à n_TOF-CERN, et étude de la fission induite par neutrons de 237Np. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2017. Available from: http://www.theses.fr/2017SACLS204
Université de Grenoble
23.
Régnier, David.
Contribution à l'étude des gammas prompts de fission : Contribution to fission prompt gammas studies.
Degree: Docteur es, Mécanique, génie mécanique, 2013, Université de Grenoble
URL: http://www.theses.fr/2013GRENI065
► Cette thèse a essentiellement été motivée par la montée en puissance de la thématique des échauffements nucléaires en réacteurs. Elle avait pour objectif la mise…
(more)
▼ Cette thèse a essentiellement été motivée par la montée en puissance de la thématique des échauffements nucléaires en réacteurs. Elle avait pour objectif la mise en place de méthodes permettant la simulation de l'émission des gammas prompts de fission. Pour répondre à cette attente, différents algorithmes de désexcitation d'un noyau ont été implémentés. Ils ont été testés avec succès via plusieurs calculs d'application (rapport d'embranchement isomérique, largeur radiative totale, etc). Ces méthodes ont ensuite été mises en oeuvre dans le cadre du code de fission FIFRELIN. L'outil qui en résulte, permet la détermination d'un grand nombre d'observables de fission, dans le cadre d'un modèle unique. Une étude de sensibilité des résultats à différents éléments du calcul a été réalisée. Enfin, des simulations de la fission spontanée du 252Cf, et des fissions induites par neutrons thermiques sur l' 235U et le 239Pu ont été menées. Les spectres des gammas prompts pour ces trois systèmes fissionnants ont pu être déterminés. Les résultats obtenus sont en très bon accord avec les données expérimentales disponibles, dont certaines ont été publiées récemment (2012 et 2013).
This PhD thesis has essentially been motivated by the nuclear heating problematic in reactors. The main goal of this work was the production of methods capable of simulating the prompt gamma emission from fission. First of all, several algorithms for the treatment of the nucleus deexcitation were implemented. They have been succesfully tested through various calculations (isomeric branching ratio, total radiative width, etc). These methods were then incorporated in the frame of the fission code FIFRELIN. The tool which results from this work, enables the determination of numerous fission observables in the frame of a single consistent model. A sensitivity study of the results to several numerical and nuclear models has been realized. At last, calculation have been lead for the 252Cf spontaneous fission and the thermal neutron induced fission of 235U and 239Pu. The prompt gamma spectra obtained for those three fissionning systems have been determined. The results are in good agreement with available experimental data, including recent measurements published in 2012 and 2013.
Advisors/Committee Members: Sérot, Olivier (thesis director).
Subjects/Keywords: Gammas; Prompts; Fission; Nucléaire; Spectre; Gammas; Prompt; Fission; Nuclear; Spectra, spectrum
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Régnier, D. (2013). Contribution à l'étude des gammas prompts de fission : Contribution to fission prompt gammas studies. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2013GRENI065
Chicago Manual of Style (16th Edition):
Régnier, David. “Contribution à l'étude des gammas prompts de fission : Contribution to fission prompt gammas studies.” 2013. Doctoral Dissertation, Université de Grenoble. Accessed January 23, 2021.
http://www.theses.fr/2013GRENI065.
MLA Handbook (7th Edition):
Régnier, David. “Contribution à l'étude des gammas prompts de fission : Contribution to fission prompt gammas studies.” 2013. Web. 23 Jan 2021.
Vancouver:
Régnier D. Contribution à l'étude des gammas prompts de fission : Contribution to fission prompt gammas studies. [Internet] [Doctoral dissertation]. Université de Grenoble; 2013. [cited 2021 Jan 23].
Available from: http://www.theses.fr/2013GRENI065.
Council of Science Editors:
Régnier D. Contribution à l'étude des gammas prompts de fission : Contribution to fission prompt gammas studies. [Doctoral Dissertation]. Université de Grenoble; 2013. Available from: http://www.theses.fr/2013GRENI065
24.
Qi, Liqiang.
Measurements of Prompt Gamma Rays Emitted in Fission of ²³⁸U and ²³⁹ Pu Induced by Fast Neutrons from the LICORNE Neutron Source : Étude des rayonnements gamma émis lors de la fission de ²³⁸U et ²³⁹Pu induite par neutrons rapides à l'aide de la source de neutrons LICORNE.
Degree: Docteur es, Structure et réactions nucléaires, 2018, Université Paris-Saclay (ComUE)
URL: http://www.theses.fr/2018SACLS320
► Les spectres des rayons γ prompt de fission sont des données nucléaires importantes pour la physique des réacteurs, en tant qu'entrée pour les calculs de…
(more)
▼ Les spectres des rayons γ prompt de fission sont des données nucléaires importantes pour la physique des réacteurs, en tant qu'entrée pour les calculs de chauffage gamma, puisque l'effet de chauffage gamma peut être sous-estimé jusqu'à ~28% avec les données nucléaires actuelles. De plus, les nouvelles informations sur les rayons γ prompts de fission seront utiles du point de vue de la physique fondamentale, où les résultats peuvent être comparés à de nombreuses prédictions théoriques concurrentes pour affiner les modèles du processus de fission. Les spectres des rayons γ prompts de fission ont été mesurés pour la fission induite par neutrons rapides de ²³⁸U et de ²³⁹Pu, en utilisant des neutrons rapides générés à partir de la source LICORNE. Le dispositif expérimental se composait d'une chambre d'ionisation et de différents types de détecteurs à scintillation, dont les détecteurs LaBr₃ et PARIS phoswich. Une procédure d'analyse, comprenant le unfolding et la simulation de la réponse aux rayons γ dans les détecteurs à scintillation, est mise au point pour extraire le spectre des rayons γ prompts de fission et les caractéristiques spectrales correspondantes. Les résultats expérimentaux sont comparés aux codes de modélisation de fission GEF et FREYA. Cette comparaison révèle que les caractéristiques spectrales sont liées aux conditions énergétiques, aux rendements isotopiques et au moment angulaire des fragments de fission. La dépendance énergétique des caractéristiques spectrales montre que l'émission des rayons γ est tout à fait insensible à l'énergie neutronique incidente. Toutefois, on observe une forte dépendance à l'égard du système fissionnant particulier.
Prompt fission γ-ray spectra are important nuclear data for reactor physics, as an input for gamma heating calculations, since the gamma heating effect can be under-estimated by up to ~28% with present nuclear data. Furthermore the new prompt fission γ-ray information will be useful from a fundamental physics point of view, where results can be compared with many competing theoretical predictions to refine models of fission process. Prompt fission γ-ray spectra have been measured for the fast-neutron-induced fission of ²³⁸U and ²³⁹PuPu, using fast neutrons generated from the LICORNE source. The experimental setup consisted of an ionization chamber and different types of scintillation detectors, including LaBr₃ and PARIS phoswich detectors. An analysis procedure, including unfolding and recovering the γ-ray response in the scintillation detectors, is developed to extract the prompt fission γ-ray spectrum and corresponding spectral characteristics. The experimental results are compared to the fission modeling codes GEF and FREYA. This comparison reveals that the spectral characteristics are related to the energetic conditions, isotopic yields and angular momentum of the fission fragments. The energy dependence of the spectral characteristics shows that the prompt γ-rays emission is quite insensitive to the incident neutron energy. However, a strong dependence…
Advisors/Committee Members: Wilson, Jonathan (thesis director).
Subjects/Keywords: Fission; Rayon gamma; Source de neutrons; Fission; Gamma ray; Neutron source
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Qi, L. (2018). Measurements of Prompt Gamma Rays Emitted in Fission of ²³⁸U and ²³⁹ Pu Induced by Fast Neutrons from the LICORNE Neutron Source : Étude des rayonnements gamma émis lors de la fission de ²³⁸U et ²³⁹Pu induite par neutrons rapides à l'aide de la source de neutrons LICORNE. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2018SACLS320
Chicago Manual of Style (16th Edition):
Qi, Liqiang. “Measurements of Prompt Gamma Rays Emitted in Fission of ²³⁸U and ²³⁹ Pu Induced by Fast Neutrons from the LICORNE Neutron Source : Étude des rayonnements gamma émis lors de la fission de ²³⁸U et ²³⁹Pu induite par neutrons rapides à l'aide de la source de neutrons LICORNE.” 2018. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed January 23, 2021.
http://www.theses.fr/2018SACLS320.
MLA Handbook (7th Edition):
Qi, Liqiang. “Measurements of Prompt Gamma Rays Emitted in Fission of ²³⁸U and ²³⁹ Pu Induced by Fast Neutrons from the LICORNE Neutron Source : Étude des rayonnements gamma émis lors de la fission de ²³⁸U et ²³⁹Pu induite par neutrons rapides à l'aide de la source de neutrons LICORNE.” 2018. Web. 23 Jan 2021.
Vancouver:
Qi L. Measurements of Prompt Gamma Rays Emitted in Fission of ²³⁸U and ²³⁹ Pu Induced by Fast Neutrons from the LICORNE Neutron Source : Étude des rayonnements gamma émis lors de la fission de ²³⁸U et ²³⁹Pu induite par neutrons rapides à l'aide de la source de neutrons LICORNE. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2018. [cited 2021 Jan 23].
Available from: http://www.theses.fr/2018SACLS320.
Council of Science Editors:
Qi L. Measurements of Prompt Gamma Rays Emitted in Fission of ²³⁸U and ²³⁹ Pu Induced by Fast Neutrons from the LICORNE Neutron Source : Étude des rayonnements gamma émis lors de la fission de ²³⁸U et ²³⁹Pu induite par neutrons rapides à l'aide de la source de neutrons LICORNE. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2018. Available from: http://www.theses.fr/2018SACLS320
University of New South Wales
25.
EL-HAJJE, REFAAT.
A simultaneous measurement of the angular distribution, mass and kinetic energy of 235U and 232Th fission fragments.
Degree: Safety Science, 2000, University of New South Wales
URL: http://handle.unsw.edu.au/1959.4/17612
;
https://unsworks.unsw.edu.au/fapi/datastream/unsworks:440/SOURCE01?view=true
► Simultaneous measurements of the angular distribution, mass distribution and average total kinetic energy of fission fragments produced by the neutron-induced fission of 235U and 232Th…
(more)
▼ Simultaneous measurements of the angular distribution, mass distribution and average total kinetic energy of fission fragments produced by the neutron-induced fission of 235U and 232Th have been made using a gridded ionisation chamber. The neutron energy range used was thermal to 1.9 MeV for 235U and 1.4 to 1.7 MeV for 232Th.The following topics were investigated: the interdependence of the fission fragment angular and mass distribution; the anomalous behaviour of fragment anisotropy for 235U(n,f) at neutron energies En below 150 keV; the possible existence of a third symmetric mass peak for 232Th(n,f); the mass fine structure in 235U(n,f) and 232Th(n,f); and the dependence of the fission fragment average total kinetic energy on the excitation energy of the fissioning nucleus.For this study, mono-energetic neutrons were produced by the and reactions. Four signals produced by the fission chamber were fed into a data acquisition system and processed by a specially modified comprehensive computer program.The results indicate that there is no interdependence between the angular and mass distributions of fragments for 235U(n,f) and for 232Th(n,f). The angular distribution of 235U fission fragments showed an anisotropy of less than one for En below 150 keV. For 232Th, the expected minimum in the anisotropy near En = 1.6 MeV was confirmed. No evidence for a third peak in the mass symmetry region of 232Th(n,f) was observed, within the yield sensitivity limitation of the chamber. Fine structure was observed in the mass yield distributions for 235U(n,f) and 232Th(n,f) at mass locations predicted by theory. The fission fragment average total kinetic energy for 235U(n,f) and 232Th(n,f) showed no significant dependence on the excitation energy of the fissioning nucleus. Possible reasons for some of these results are advanced.
Subjects/Keywords: Fission products Analysis; Nuclear fission
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
EL-HAJJE, R. (2000). A simultaneous measurement of the angular distribution, mass and kinetic energy of 235U and 232Th fission fragments. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/17612 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:440/SOURCE01?view=true
Chicago Manual of Style (16th Edition):
EL-HAJJE, REFAAT. “A simultaneous measurement of the angular distribution, mass and kinetic energy of 235U and 232Th fission fragments.” 2000. Doctoral Dissertation, University of New South Wales. Accessed January 23, 2021.
http://handle.unsw.edu.au/1959.4/17612 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:440/SOURCE01?view=true.
MLA Handbook (7th Edition):
EL-HAJJE, REFAAT. “A simultaneous measurement of the angular distribution, mass and kinetic energy of 235U and 232Th fission fragments.” 2000. Web. 23 Jan 2021.
Vancouver:
EL-HAJJE R. A simultaneous measurement of the angular distribution, mass and kinetic energy of 235U and 232Th fission fragments. [Internet] [Doctoral dissertation]. University of New South Wales; 2000. [cited 2021 Jan 23].
Available from: http://handle.unsw.edu.au/1959.4/17612 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:440/SOURCE01?view=true.
Council of Science Editors:
EL-HAJJE R. A simultaneous measurement of the angular distribution, mass and kinetic energy of 235U and 232Th fission fragments. [Doctoral Dissertation]. University of New South Wales; 2000. Available from: http://handle.unsw.edu.au/1959.4/17612 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:440/SOURCE01?view=true
NSYSU
26.
Lin, Pin-Han.
FISSION, NEW GROUP FORMATION AND SOCIAL CHANGES IN FORMOSAN MACAQUES IN MT. LONGEVITY.
Degree: Master, Biological Sciences, 2000, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731100-174647
► Abstract Formosan macaque (Macaca cyclopis) is the endemic and threatening species of Taiwan, but information regarding their social behaviors is rare. Troop fission of macaqueâs…
(more)
▼ Abstract
Formosan macaque (Macaca cyclopis) is the endemic and threatening species of Taiwan, but information regarding their social behaviors is rare. Troop
fission of macaqueâs social behaviors was the rarely and accidental behavior. Two
fission of Formosan macaques troops, from B0 and C0, at Mt. Longevity of Taiwan were the objects in this study. Field study was concentrated from November 1999 when
fission occurred till May 2000. The records included the troopâs composition changes and interactions of troops after
fission, and using these records to infer the reason of troop
fission in Formosan macaques. The focal sampling method and scan sampling method were used to collect individualsâ behaviorsãsocial behaviors and habitat utilization of four troopsï¼main troop B, branch troop Ba, main troop C and branch troop Caï¼ after
fission. Troop B and Ba remained separately six months after
fission. But two months after
fission, a fusion occurred between troop Ca and troop C. In the phenomenon of
fission, the individuals who left the original troop and emigrated to the branch troop were all the subordinate or periphery individuals in the original troops. When they emigrated to the branch troops, their ranks were higher than that of the original troops. Adult females initiated the troop
fission, and the other individuals joined later. Compared with the adult male, the composition of troop adult females were much stable and were the nucleus of branch troops. Only the adult sex ratios of troop Ca was lower than that of the original troop. Females delivered infants in branch troops were pregnant before troop
fission. These two cases indicated that:
fission occurred in Formosan macaque was not due to increasing mating partners or chances, but because of some adult femalesâ fitness lost in their original troop. After
fission, the branch troops, Ba and Ca, were 1/4 ~ 1/5 troop size to the main troop. When main troop B met the branch troop Ba, the behaviors of main troop B indicated troop B was dominant to the branch troop Ba. The main troop B and branch troop Ba had a significant difference in home range using ï¼Ï2 = 49.195, d.f.= 14, p< 0.05ï¼. The branch troop Baâ home range was larger than that of the main troop B or of the original troop B0. The difference of night resting-sites between the main troop B and the branch troop Ba was not significantï¼Ï2 = 11.6, d.f.= 13, p> 0.598ï¼.
Advisors/Committee Members: Bao-Sen Shieh (chair), Jy-Minna Hsu (committee member), Lien-Siang Chou (chair).
Subjects/Keywords: Formosan macaque; fission
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lin, P. (2000). FISSION, NEW GROUP FORMATION AND SOCIAL CHANGES IN FORMOSAN MACAQUES IN MT. LONGEVITY. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731100-174647
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):
Lin, Pin-Han. “FISSION, NEW GROUP FORMATION AND SOCIAL CHANGES IN FORMOSAN MACAQUES IN MT. LONGEVITY.” 2000. Thesis, NSYSU. Accessed January 23, 2021.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731100-174647.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lin, Pin-Han. “FISSION, NEW GROUP FORMATION AND SOCIAL CHANGES IN FORMOSAN MACAQUES IN MT. LONGEVITY.” 2000. Web. 23 Jan 2021.
Vancouver:
Lin P. FISSION, NEW GROUP FORMATION AND SOCIAL CHANGES IN FORMOSAN MACAQUES IN MT. LONGEVITY. [Internet] [Thesis]. NSYSU; 2000. [cited 2021 Jan 23].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731100-174647.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lin P. FISSION, NEW GROUP FORMATION AND SOCIAL CHANGES IN FORMOSAN MACAQUES IN MT. LONGEVITY. [Thesis]. NSYSU; 2000. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731100-174647
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Pretoria
27.
Ngwenya, Nonhlanhla.
Bioremediation of metallic fission products in nuclear
waste : biosorption and biorecovery
.
Degree: 2011, University of Pretoria
URL: http://upetd.up.ac.za/thesis/available/etd-10122011-151728/
► The performance of a growing sulphate reducing bacteria consortium for Sr2+, Co2+ and Cs+ removal from solution in a batch sulphidogenic bioreactor was investigated. Metal…
(more)
▼ The performance of a growing sulphate reducing
bacteria consortium for Sr2+, Co2+ and Cs+ removal from solution in
a batch sulphidogenic bioreactor was investigated. Metal removal by
the growing bacterial consortium, and microbial culture growth and
metabolic activities (biological sulphate removal) were
continuously monitored in the bioreactors over the duration of the
treatment period. On the other hand, diversity changes within the
bacterial consortium before and after bioreactor operation (28
days) were performed using the partial 16S rRNA fingerprinting
method. In the original bacterial consortium, Enterococcus and
Staphylococcus sp. were the dominant bacterial species. However,
the presence of Sr2+, Co2+ and Cs+ in the growth media, resulted in
the emergence of new bacterial species belonging to the
Citrobacter, Paenibacillus, and Enterococcus and Stenotrophomonas
genera, respectively. The Citrobacter and Paenibacillus sp.
demonstrated high tolerance towards the presence of the divalent
cations, Sr2+ and Co2+, respectively, while the Enterococcus and
Stenotrophomonas sp., demonstrated Cs+ high tolerance. The
bacterial growth and sulphate removal rate were significantly
decreased at initial metal ion concentrations ≥100 mg/L. The
toxicity and inhibitory effects of the metals on the present SRB
consortium was observed in the order Sr>Co>Cs. The metal
uptake capacity (qτ) of the bacterial consortium decreased with
increasing initial metal concentration, and complete Sr2+, Co2+ and
Cs+ removal was observed at initial metal concentrations ≤75 mg/L.
Overall, the present SRB consortium demonstrated a superior Sr2+
removal capacity (qmax= 405 mg/g), and the least for Cs2+, where
qmax = 192 mg/g. The present SRB culture exhibited a superior Sr+
and Cs+ binding capacity, compared to other studies in literature.
Results from Sr2+, Co2+ and Cs+ biosorption kinetics indicate that
initial concentration and solution pH played a vital role in
determining the rate of metal removal kinetics. The experimental
data was successfully analysed by the pseudo-second-order rate
model, demonstrating that chemisorption is the main rate limiting
step for the removal of Sr2+, Co2+ and Cs+ from solution. In this
study, the adsorption behaviour of protons and of Sr2+, Co2+ and
Cs+ onto the bacterial consortium cell surfaces was evaluated under
anaerobic conditions as a function of pH (4-10), ionic strength
(0.01, 0.05, 0.1M) and temperature (25, 50 and 75°C). Acid-base
titrations of the bacterial suspension indicated that the titration
data could be adequately described by a four site non-electrostatic
model, with pKa values of 4.41, 6.69, 8.10 and 10. The Sr2+, Co2+
and Cs+ adsorption data could be fitted with a two site
non-electrostatic model, involving the type 1 and 2 sites
(carboxylic and phosphoryl sites). Increasing the ionic strength
had a negative effect on the adsorption of metal ions from
solution. There was no observed temperature dependence on the
adsorption of Co2+ and Cs+ from solution. In summary, results
obtained in this…
Advisors/Committee Members: Prof E Chirwa (advisor).
Subjects/Keywords: Metallic fission products;
Sulphate;
Nuclear waste;
UCTD
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ngwenya, N. (2011). Bioremediation of metallic fission products in nuclear
waste : biosorption and biorecovery
. (Doctoral Dissertation). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-10122011-151728/
Chicago Manual of Style (16th Edition):
Ngwenya, Nonhlanhla. “Bioremediation of metallic fission products in nuclear
waste : biosorption and biorecovery
.” 2011. Doctoral Dissertation, University of Pretoria. Accessed January 23, 2021.
http://upetd.up.ac.za/thesis/available/etd-10122011-151728/.
MLA Handbook (7th Edition):
Ngwenya, Nonhlanhla. “Bioremediation of metallic fission products in nuclear
waste : biosorption and biorecovery
.” 2011. Web. 23 Jan 2021.
Vancouver:
Ngwenya N. Bioremediation of metallic fission products in nuclear
waste : biosorption and biorecovery
. [Internet] [Doctoral dissertation]. University of Pretoria; 2011. [cited 2021 Jan 23].
Available from: http://upetd.up.ac.za/thesis/available/etd-10122011-151728/.
Council of Science Editors:
Ngwenya N. Bioremediation of metallic fission products in nuclear
waste : biosorption and biorecovery
. [Doctoral Dissertation]. University of Pretoria; 2011. Available from: http://upetd.up.ac.za/thesis/available/etd-10122011-151728/
University of Utah
28.
Koirala, Sajjan.
The structural and functional roles of mitochondrial fission adaptors in yeast and humans.
Degree: PhD, Biochemistry, 2012, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3445/rec/2684
► The mitochondrion is an essential organelle in eukaryotic cells. The major functions of mitochondria are ATP production, calcium homeostasis, heme and lipidbiosynthesis and apoptosis. Mitochondria…
(more)
▼ The mitochondrion is an essential organelle in eukaryotic cells. The major functions of mitochondria are ATP production, calcium homeostasis, heme and lipidbiosynthesis and apoptosis. Mitochondria form a dynamic tubular spaghetti-like network that fuses, divides and moves within the cell. The molecular events that regulatemitochondrial dynamics are important for various cellular and developmental processes and are linked to cellular dysfunction and disease. This dissertation focuses on themolecular machineries that carry out mitochondrial fission in yeast and human.Mitochondrial fission requires both dynamin-related GTPases (called Dnm1/Drp1 in yeast/human) and membrane adaptors. In yeast, a tail-anchored protein called Fis1 and an adaptor protein called Mdv1 recruit Dnm1 to the membrane. Mdv1 interacts withDnm1 and stimulates Dnm1 self-assembly. Although Fis1 is conserved in humans, an Mdv1 ortholog is absent. Instead, humans have at least three other membrane anchored proteins (Mff, MiD49, MiD51/MIEF1) whose roles in fission are poorly defined.Studies presented in this thesis address two key issues related to mitochondrial fission. First, experiments in Chapter 2 address how the structure of the yeastmitochondrial adaptor (Mdv1) affects Dnm1 function. A structural study of the Mdv1 central domain shows that this region forms an unusually long antiparallel coiled coilwhich positions the P-propeller domains of Mdv1 to interact with Dnm1 as it transitions from the cytoplasm to mitochondria. In vivo studies with altered coiled coil domains demonstrates the importance of this domain in Mdv1-Fis1 binding, Dnml mitochondrial recruitment and Dnm1-mediated mitochondrial fission. Second, experiments in Chapter 3 determine whether multiple human adaptors are capable of working independently toelicit Drp1-mediated membrane fission. In vivo studies using the yeast and human adaptors in a minimal yeast system show that Fis1 is dispensable for mitochondrialmembrane scission. These studies also demonstrate that Mdv1, Mff, or MiDs can work in parallel with their corresponding DRPs to catalyze membrane fission. Importantly, coassembly of MiD49 protein with Drp1 dramatically decreases the diameter of assembledDrp1 structures. Together, these studies advance our understanding of how adaptors and fission dynamins work together to achieve membrane constriction and fission, and raise important questions for future studies.
Subjects/Keywords: Coiled-coil; Dynamics; Fission; Fusion; Membrane; Mitochondria
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Koirala, S. (2012). The structural and functional roles of mitochondrial fission adaptors in yeast and humans. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3445/rec/2684
Chicago Manual of Style (16th Edition):
Koirala, Sajjan. “The structural and functional roles of mitochondrial fission adaptors in yeast and humans.” 2012. Doctoral Dissertation, University of Utah. Accessed January 23, 2021.
http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3445/rec/2684.
MLA Handbook (7th Edition):
Koirala, Sajjan. “The structural and functional roles of mitochondrial fission adaptors in yeast and humans.” 2012. Web. 23 Jan 2021.
Vancouver:
Koirala S. The structural and functional roles of mitochondrial fission adaptors in yeast and humans. [Internet] [Doctoral dissertation]. University of Utah; 2012. [cited 2021 Jan 23].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3445/rec/2684.
Council of Science Editors:
Koirala S. The structural and functional roles of mitochondrial fission adaptors in yeast and humans. [Doctoral Dissertation]. University of Utah; 2012. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3445/rec/2684
29.
Chietera, Andreina.
Angular correlations between fragments and neutrons in the spontaneous fissions of 252 Cf : Corrélations angulaires entre les fragments et les neutrons dans la fission spontanée du 252Cf.
Degree: Docteur es, Physique, 2015, Université de Strasbourg
URL: http://www.theses.fr/2015STRAE048
► L'objectif de cette thèse est d'explorer les mécanismes d'émission des neutrons émis lors du processus de la fission. En particulier, la question ouverte de l'existence…
(more)
▼ L'objectif de cette thèse est d'explorer les mécanismes d'émission des neutrons émis lors du processus de la fission. En particulier, la question ouverte de l'existence d'une anisotropie dynamique dans le centre de masse des fragments de fission et/ou de la possibilité d'une émission de neutrons de scission est explorée. La thèse débute par une introduction aux concepts théoriques permettant de décrire les processus de fission et les mécanismes d'émission de neutrons. La nécessité de concevoir une méthode d'analyse appropriée pour caractériser des mécanismes très subtiles est discutée, en insistant sur l'importance de maîtriser les biais expérimentaux. Le travail effectué a exigé un effort important de simulation, à travers le développement d'une procédure Monte Carlo pour décrire la fission spontanée du 252Cf, ainsi qu'une modélisation du dispositif expérimental de l'expérience CORA3.Nous proposons pour la première fois une approche simultanée et indépendante des deux mécanismes, émission de scission et anisotropie dynamique, ainsi que des valeurs quantitatives d'anisotropie et d'émission de scission mesurées expérimentalement.
The subject of this thesis is to explore the neutron emission mechanisms in the fission process. In particular a long standing open question, the existence of a dynamical anisotropy in the centre of mass of the fission fragments and/or a possible scission neutron emission is explored. The thesis starts with an overview of the theoretical concepts on the fission process and on the neutron emission mechanisms. Also the necessity to conceive an appropriate analysis method is stressed when a very subtle mechanism is studied as various approximations and/or experimental biases not completely handled can hide the physical phenomena. In the presented work a huge effort was required to write a Monte Carlo procedure based on a coherent model for the spontaneous fission of 252Cf and to couple it with the devices exploited in the CORA3 experiment.
Advisors/Committee Members: Stuttge, Louise (thesis director).
Subjects/Keywords: Réactions de fission; Fission spontanée; Émission des neutrons; Anisotropie dynamique; Neutrons de scission; Détection des neutrons; Fission reactions; Spontaneous fission; Neutron emission; Dynamic anisotropy; Scission neutrons; Neutron detection; 539.7
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chietera, A. (2015). Angular correlations between fragments and neutrons in the spontaneous fissions of 252 Cf : Corrélations angulaires entre les fragments et les neutrons dans la fission spontanée du 252Cf. (Doctoral Dissertation). Université de Strasbourg. Retrieved from http://www.theses.fr/2015STRAE048
Chicago Manual of Style (16th Edition):
Chietera, Andreina. “Angular correlations between fragments and neutrons in the spontaneous fissions of 252 Cf : Corrélations angulaires entre les fragments et les neutrons dans la fission spontanée du 252Cf.” 2015. Doctoral Dissertation, Université de Strasbourg. Accessed January 23, 2021.
http://www.theses.fr/2015STRAE048.
MLA Handbook (7th Edition):
Chietera, Andreina. “Angular correlations between fragments and neutrons in the spontaneous fissions of 252 Cf : Corrélations angulaires entre les fragments et les neutrons dans la fission spontanée du 252Cf.” 2015. Web. 23 Jan 2021.
Vancouver:
Chietera A. Angular correlations between fragments and neutrons in the spontaneous fissions of 252 Cf : Corrélations angulaires entre les fragments et les neutrons dans la fission spontanée du 252Cf. [Internet] [Doctoral dissertation]. Université de Strasbourg; 2015. [cited 2021 Jan 23].
Available from: http://www.theses.fr/2015STRAE048.
Council of Science Editors:
Chietera A. Angular correlations between fragments and neutrons in the spontaneous fissions of 252 Cf : Corrélations angulaires entre les fragments et les neutrons dans la fission spontanée du 252Cf. [Doctoral Dissertation]. Université de Strasbourg; 2015. Available from: http://www.theses.fr/2015STRAE048
Oregon State University
30.
Trapp, Turner Japhet.
The effects of the depletion and buildup of fissile nuclides and of ²³⁸U fast fissions on fission product decay power.
Degree: PhD, Nuclear Engineering, 1978, Oregon State University
URL: http://hdl.handle.net/1957/43152
Subjects/Keywords: Fission products – Decay
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Trapp, T. J. (1978). The effects of the depletion and buildup of fissile nuclides and of ²³⁸U fast fissions on fission product decay power. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/43152
Chicago Manual of Style (16th Edition):
Trapp, Turner Japhet. “The effects of the depletion and buildup of fissile nuclides and of ²³⁸U fast fissions on fission product decay power.” 1978. Doctoral Dissertation, Oregon State University. Accessed January 23, 2021.
http://hdl.handle.net/1957/43152.
MLA Handbook (7th Edition):
Trapp, Turner Japhet. “The effects of the depletion and buildup of fissile nuclides and of ²³⁸U fast fissions on fission product decay power.” 1978. Web. 23 Jan 2021.
Vancouver:
Trapp TJ. The effects of the depletion and buildup of fissile nuclides and of ²³⁸U fast fissions on fission product decay power. [Internet] [Doctoral dissertation]. Oregon State University; 1978. [cited 2021 Jan 23].
Available from: http://hdl.handle.net/1957/43152.
Council of Science Editors:
Trapp TJ. The effects of the depletion and buildup of fissile nuclides and of ²³⁸U fast fissions on fission product decay power. [Doctoral Dissertation]. Oregon State University; 1978. Available from: http://hdl.handle.net/1957/43152
◁ [1] [2] [3] [4] [5] … [21] ▶
. 
Open Access Theses and Dissertations