Theory of Computing Systems \/ Mathematical Systems Theory最新文献_第10页

Comparison Of 252Cf Time Correlated Induced Fisssion With AmLi Induced Fission On Fresh MTR Research Reactor Fuel 252Cf时间相关诱导裂变与AmLi诱导裂变在新鲜MTR研究堆燃料上的比较

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2017-03-30 DOI: 10.2172/1351252

J. Joshi

{"title":"Comparison Of 252Cf Time Correlated Induced Fisssion With AmLi Induced Fission On Fresh MTR Research Reactor Fuel","authors":"J. Joshi","doi":"10.2172/1351252","DOIUrl":"https://doi.org/10.2172/1351252","url":null,"abstract":"The effective application of international safeguards to research reactors requires verification of spent fuel as well as fresh fuel. To accomplish this goal various nondestructive and destructive assay techniques have been developed in the US and around the world. The Advanced Experimental Fuel Counter (AEFC) is a nondestructive assay (NDA) system developed at Los Alamos National Laboratory (LANL) combining both neutron and gamma measurement capabilities. Since spent fuel assemblies are stored in water, the system was designed to be watertight to facilitate underwater measurements by inspectors. The AEFC is comprised of six He detectors as well as a shielded and collimated ion chamber. The He detectors are used for active and passive neutron coincidence counting while the ion chamber is used for gross gamma counting. In the past, most of the active interrogation systems along with the AEFC were calibrated by AmLi neutron source. In this study, experiments were performed to calibrate the AEFC instrument and compare use of the Cf spontaneous fission source and the AmLi (α,n) neutron emission source. MCNP simulations were carried out to benchmark experiments. This thesis analyzes time correlated induced fission (TCIF) from fresh MTR fuel assemblies due to Cf and AmLi active interrogation sources. Benchmarking showed MCNP singles and doubles count rates agree with experimental singles and doubles within 5% and 4% respectively in the case of full assembly. After normalizing Cf to the AmLi source strength, AmLi resulted 1.228 times more IF singles rate, while Cf resulted 1.176 times more IF doubles rate. This indicates the boost in the doubles rate with Cf source is due to the TCIF effect.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"55 1","pages":"24"},"PeriodicalIF":0.0,"publicationDate":"2017-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80448631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effects of Concentration Intensification on Nanoparticle Synthesis 浓度增强对纳米颗粒合成的影响

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2017-01-30 DOI: 10.7298/X4F18WQV

C. Williamson

{"title":"The Effects of Concentration Intensification on Nanoparticle Synthesis","authors":"C. Williamson","doi":"10.7298/X4F18WQV","DOIUrl":"https://doi.org/10.7298/X4F18WQV","url":null,"abstract":"Realizing the promise of nanoparticle-based technologies demands more efficient, robust synthesis methods (i.e., process intensification) that consistently produce high-quality and large-quantities of nanoparticles (NPs). We explored NP synthesis via the heat-up method in a regime of previously unexplored high concentrations near the solubility limit of the precursors. We discovered that in this highly concentrated and viscous regime the NP synthesis parameters are less sensitive to experimental variability and thereby provide a robust, scalable, and sizefocusing NP synthesis. Specifically, we synthesize high-quality metal sulfide NPs (< 7% relative standard deviation for Cu2-xS, CdS, and PbS), and demonstrate 10-1000 fold increase in Cu2-xS NP production (>200 g) relative to the current field of large-scale (0.1-5 g yields) and lab-scale (<0.1 g) efforts. Compared to conventional synthesis methods (hot-injection with dilute precursor concentration) characterized by rapid growth and low yield, our highly concentrated NP system supplies remarkably controlled growth rates and a ten-fold increase in NP volumetric production capacity (86 g/L). The controlled growth, high yield, and robust nature of highly concentrated solutions can facilitate large-scale nano-manufacturing of NPs by relaxing synthesis requirements to achieve monodisperse products. Mechanistically, our investigation of the thermal and rheological properties, and growth rates reveals that this high concentration regime has an order of magnitude increase in solution viscosity, reducing mass diffusion, a ~67% increase in heat capacity, stabilizing the reaction to perturbations, and the decreasing influence of Ostwald ripening.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"30 1","pages":"28"},"PeriodicalIF":0.0,"publicationDate":"2017-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78847648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of Novel Membrane Technologies for Hydrogen Separation 新型膜分离氢技术的研究

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2017-01-01 DOI: 10.13016/M29G5GD9P

W. V. Cleave

{"title":"Investigation of Novel Membrane Technologies for Hydrogen Separation","authors":"W. V. Cleave","doi":"10.13016/M29G5GD9P","DOIUrl":"https://doi.org/10.13016/M29G5GD9P","url":null,"abstract":"Title of document: INVESTIGATION OF NOVEL MEMBRANE TECHNOLOGIES FOR HYDROGEN SEPARATION William M. Van Cleave, Master of Science, 2017 Thesis directed by: Professor Ashwani K. Gupta Department of Mechanical Engineering The production of hydrogen gas via its separation from multicomponent syngas derived from biomass is an important process in the burgeoning carbon-neutral hydrogen economy. Current methods utilize membranes made from expensive materials such as palladium or bulky pressure vessels that use adsorption properties. Holey graphene and doped perovskite ceramics are alternative membrane materials that are relatively inexpensive and easily produced. A range of holey graphene membranes was produced using dry pressing and other techniques, including high temperature reduction, to examine the efficiency of this material. Experimental results using these holey graphene membranes are presented from a lab-scale facility designed to test various membrane types. These results showed decreasing flux and increasing selectivity as membrane thickness increased. Comparison with results from literature indicate these membranes exhibit higher overall flux but lower selectivity when compared to palladium-based membrane technologies. INVESTIGATION OF NOVEL MEMBRANE TECHNOLOGIES FOR HYDROGEN SEPARATION","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"53 76 1","pages":"12"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78605760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Coupling Analysis Approach to Capture Unexpected Behaviors in Ares 1 一种捕获战区1中意外行为的耦合分析方法

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2017-01-01 DOI: 10.31274/ETD-180810-4966

D. Kis

引用次数: 0

A Wave Chaotic Study of Quantum Graphs with Microwave Networks 微波网络量子图的波混沌研究

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2017-01-01 DOI: 10.13016/M2Z60C28Q

Ziyuan Fu

引用次数: 2

The Impact of Shale Gas on Gas Storage Performance 页岩气对储气性能的影响

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2017-01-01 DOI: 10.33915/etd.6571

A. Sattari

引用次数: 0

COMPARATIVE ANALYSIS OF MINIATURE INTERNAL COMBUSTION ENGINE AND ELECTRIC MOTOR FOR UAV PROPULSION 无人机推进用微型内燃机与电动机的比较分析

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2017-01-01 DOI: 10.13016/M2CF9J81N

Branden Chiclana

引用次数: 0

The Social Acceptance of Community Solar: A Portland Case Study 社区太阳能的社会接受度:波特兰个案研究

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2017-01-01 DOI: 10.15760/ETD.3488

A. Weaver

引用次数: 0

Strong Coupling Between Photonic Cavities 光子腔间强耦合

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2017-01-01 DOI: 10.15760/ETD.6040

Xiang Wei

{"title":"Strong Coupling Between Photonic Cavities","authors":"Xiang Wei","doi":"10.15760/ETD.6040","DOIUrl":"https://doi.org/10.15760/ETD.6040","url":null,"abstract":"As the performance of computers has improved dramatically since the 1990s, many interesting photonic crystal properties have been theoretically and experimentally discovered. For example, the strong coupling between photonic crystal cavities was revealed in the 2000s; many groups have successfully fabricated these cavities and verified strong coupling experimentally using silicon. In this thesis, instead of using silicon, we present new results on photonic crystals made by thin indium tin oxide (ITO) layers. Compared to silicon, ITO is not an ideal material to make a photonic crystal because of its comparatively low refractive index and limited transparency. However, it is an interesting model material for experiments in photoemission electron microscopy (PEEM). ITO has a high conductivity that mitigates surface charge-up in an electron microscope and allows electron emission after 2-photon absorption with visible light. We are interested in PEEM because it enables the visualization of the propagation of light with nanometer resolution, i.e., below the optical diffraction limit. In this thesis, we theoretically study ITO photonic crystals in one or two-dimensions with the help of the finite-difference time-domain (FDTD) software. We analyze the electromagnetic field distribution in a manner that the field distributions can directly be compared to experimental PEEM results. We also simulate the strong coupling effect between neighboring cavities and illustrate it in terms of the classical oscillator model.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"262 1","pages":"31"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73556985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of Energy Efficiency Performance of Heated Windows 加热窗的能效性能评价

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2017-01-01 DOI: 10.33915/etd.5879

H. Jammulamadaka

{"title":"Evaluation of Energy Efficiency Performance of Heated Windows","authors":"H. Jammulamadaka","doi":"10.33915/etd.5879","DOIUrl":"https://doi.org/10.33915/etd.5879","url":null,"abstract":"Fenestration systems are widely used across the world. There is expansive research on window configurations, frames, and glazing technology, but not enough research has been published on reducing window heat loss through heat application to a pane. The presented study attempted to evaluate the performance of heated windows by developing an experimental setup to test a window at various temperatures by varying the power input to the window. Heated double pane window was installed in an insulated box. A temperature gradient was developed across the window by cooling one side of the window using gel-based ice packs. The other face of the window was heated by enabling power at different wattages through the window. The temperature of the inside and outside panes, current and voltage input, and temperature of the room and box were recorded. The data was used to calculate the apparent effective resistance of the window when not being heated vs . when being heated. The study concluded that, when window temperature was maintained close to the room temperature, the heated double pane window is effective in reducing heat loss by as much as 50% as compared to a non-heated double pane window. When temperature of the window was much higher than the room temperature, the heat loss through the window increased beyond that of a non-heated window. The issues encountered during the current stages of experiments are noted, and recommendations are provided for future studies.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"6 1","pages":"4"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86468436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3