Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"SNM"”.
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Neutron Response Vectorization and Optimization of Moderating Neutron Spectrometers for Active Interrogation
The detection of special nuclear material (SNM) is no trivial task; the low activity of isotopes such as 235U and the ease of shielding make their passive detection virtually impossible in the maritime environment. Active interrogation, while increasing the radiative signature, also increases the …
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Dual Neutral Particle Beam Interrogation of Intermodal Shipping Containers for Special Nuclear Material
… unsecured or stolen special nuclear material (SNM). The only direct method fielded to indicate the presence of SNM is by passive photon/neutron radiation detection. Active interrogation using neutral particle beams to induce fission in SNM is a method under consideration. One by-product of …
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Material flow simulation in a nuclear chemical process
… plant the special nuclear materials (SNM) are received as constituents of spent fuel assemblies, are converted to liquid form, and undergo a series of chemical processes. Uncertainties in measurements of SNM at each stage of reprocessing limit the accuracy of simple material balance …
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Characterization of fissile material using low energy neutron interrogation
… for the presence of special nuclear material (SNM) in cargo containers. The proposed system aims to defeat the ability of terrorists to import SNM into the United States via maritime shipping, thus greatly reducing the possibility of a successful nuclear terrorist attack. The proposed system …
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Developing a business innovation perspective of electric vehicle uptake: lessons from Milton Keynes' electric vehicle programme
… with the approach of Strategic Niche Management (SNM), which would call for the creation of protected spaces to facilitate the development of new sociotechnical configurations. The Plugged-in Programme (PiP) in Milton Keynes is an example of creating a protective space. A comparison of PiP and …
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Development of Monte Carlo models of a gamma-ray nondestructive assay system for nuclear material control and accountability
… vital to safeguarding special nuclear materials (SNM) against theft and diversion. Nondestructive assay (NDA) via gamma-ray spectrometry is one of the most common methods employed by NMCA programs to determine the amount or composition of SNM. However, accurate gamma-ray NDA of SNM can be …
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Memory Module Design for High-Temperature Applications in SiC CMOS Technology
… evaluated on the basis of static noise margin (SNM), write SNM (WSNM), read SNM (RSNM), leakage current, and read access time over a wide temperature range (25ºC to 500ºC) on three uniquely processed wafers. The noise margins measured on Wafer #2 show a lower leakage current of ~500 nA at 500ºC …
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Using a superconducting cyclotron to detect special nuclear material through multiple monoenergetic gamma radiography and o-axis photon scattering/
… scattering to nd special nuclear material (SNM). The cyclotron is a small enough accelerator to be a viable option for scanning commercial cargo containers at maritime ports, airports, rail crossings, and other places of interest. This research presents a technique for reconstructing the …
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Endoscopic Resection and Post-Operative Brachytherapy in the Treatment of Sinonasal Melanoma
Background: Sino-Nasal Melanomas (SNM) are rare, aggressive tumours often associated with a poor prognosis due to advanced stage disease at presentation. Mean 5-year survival is 0-46%. Various treatment modalities are used in the management of SNM. Surgery is regarded as the primary treatment …
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Superconducting Nanowire Integrated Circuits for Scalable Cryogenic Memory
… thesis develops superconducting nanowire memory (SNM) as a scalable implementation of SNICs. A modular cell architecture is introduced, exploiting hysteretic switching and inductive asymmetry to enable nonvolatile digital state storage with zero static power consumption. A hierarchical design …
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Imaging the ionization track of alpha recoils for the directional detection of weapons grade plutonium
… neutron spallation, and the most interesting, SNM and WGP. This detector was built for remote operations using a computer terminal for the detection of Special Nuclear Material (SNM) and Weapons Grade Plutonium (WGP). Further, this paper discusses the baseline and characterization testing using …
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Novel Non Precharging Single Bitline 8T Static Random Access Memory
… We have also analyzed the static noise margin (SNM) and the stability of the proposed design. In this analysis, we have used three methods. First, the traditional SNM method with the butterfly curve is introduced. Second, the N-curve method is used. And finally, we used the bit-line voltage …
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Development of a switchable radioisotope generator
… cask materials. PGNAA was simulated in MCNP with SNM and harmful chemicals using secondary neutrons from the SRG as another application study. The SRG was then proven to detect microstructure defects in cask and canister materials and positively identify SNM and chemical agents using …
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Monte Carlo model of a low-energy neutron interrogation system for detecting fissile material
… differently to containers containing SNM from containers that do not. Containers that contain small amounts of fissile isotopes as in the case of a few grams of uranium-235 in a kilogram of depleted uranium will also respond to this method but much more weakly. The system as proposed …
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A novel low-dose approach to active detection of shielded high-Z materials
… problem. It also provides a brief overview of SNM detection efforts, to include both passive and active detection, and shows why active detection methods are needed to detect shielded SNM. The thesis then explains the underlying physics important to multiple monoenergetic gamma line imaging and …
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ADVANCED APPLICATIONS OF COSMIC-RAY MUON RADIOGRAPHY
… accident. Warhead and special nuclear materials (SNM) imaging is an important thrust for treaty verification and national security purposes. The differentiation of SNM from other materials, such as iron and aluminum, is useful for these applications. Several techniques were developed for material …
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Ultracompact superconducting isochronous cyclotron production of ¹³N for positron emission tomography applications
… for the USIC to be utilized in an active SNM interrogation role is also explored.
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Identificación y predicción de patrones de contaminación sonora en las Smart Cities mediante el uso de técnicas de Ciencia de datos y tecnologías Big Data sobre datos acústicos.
… datos obtenidos en el mapa de ruido estratégico (SNM), el entorno acústico de un área es un fenómeno complejo que necesita ser caracterizado no solo por los niveles de ruido en el área, sino también por otras propiedades, como su comportamiento en diferentes períodos del día y su variación a largo …
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Multiple Monoenergetic Gamma Radiography (MMGR) using compact superconducting cyclotron
Smuggling of special nuclear materials (SNM) and nuclear devices through borders and ports of entry constitutes a major risk to global security. Reliable technologies are imperative for screening the flow of commerce for the presence of high-Z materials such as uranium and plutonium. This thesis …
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Stability analysis for SRAM cells with TSV induced stress in 3D ICs
… in this study show that static noise margin (SNM), Read Margin (RM) and write margin (WM) tend to increase with decreasing electron mobility or increasing hole mobility. Considering TSV-induced stress, we propose that for practical layouts of TSV-based 3D-IC, p-type substrates should be placed …
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