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Showing 1 to 20 of 23 for “"Cryogenic Temperature"”.
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Hot-carrier reliability of MOSFETs at room and cryogenic temperature
… techniques, such as photolithography, temperature scaling becomes a more viable alternative. MOSFET performance enhancement has been investigated and verified at cryogenic temperatures, such as at 77K. However, hot-carrier reliability problems have been shown to be exacerbated at low …
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An investigation into the impact fracture behaviour of poly (propylene-ethylene) copolymers using an instrumented low temperature drop weight impact tester
… of poly (propylene - ethylene) copolymers at cryogenic temperatures. A cryogenic temperature facility was incorporated into the existing instrumented drop weight impact tester to allow for variation of the impact test temperatures.
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Optimisation of ozone generation using dielectric barrier discharge
… kinetics, the gas discharge is generated at cryogenic temperature of -183 °C using liquid oxygen. The liquid ozone is produced and the highest ozone efficiency achieved is ~ 460 g/kWh. The ozone dissociation reactions involving atomic oxygen and free electrons and the humidity effect at …
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Cryogenic optical refrigeration
… anti-Stokes fluorescence to a new record low temperature. This is the coldest temperature to date, without the use of cryogens or mechanical refrigerators, and is achieved by taking advantage of the Stark manifold resonance and high doping concentration available in a crystalline host. Cooling …
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Coupling light to superconductive photon counters
… the small active area of the SNSPD and its low temperature operation. In this thesis, I have designed two experimental setups to couple the light from fiber to the detector at a cryogenic temperature of 4 K: one is for immersion device-testing in a dewar; another is for packaging the detector …
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Energetic Deposition of Niobium Thin Film in Vacuum
… performance of niobium thin films at cryogenic temperature, an energetic vacuum deposition system has been developed to study deposition energy effects on the properties of niobium thin films on various substrates. The system directly uses microwave power to create a pure niobium …
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Observation of mechanical bound states in the continuum
… loss mechanisms has been performed both at room temperature and cryogenic temperature. This new paradigm for phonon trapping, combining the macroscopic structure device and microwave frequency, has the potential for realizing the mechanical oscillators in both classical and quantum regimes, as …
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Control of Excitons and Quantum Emitters in Two-Dimensional Materials
… emitters in hBN. Photophysical studies at cryogenic temperature show the coupling efficiency of different phonon modes to the quantum emitters in hBN, and a correlation between the local strain and localized exciton energy in TMDs. In addition, a strain gradient applied by a nanoscale tip …
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Space environmental effects on graphite-epoxy compressive properties and epoxy tensile properties
… coupons. Compression tests were conducted at cryogenic (-250°F; -157°C), room, and elevated (250°F; 121°C) temperatures. Elastic and strength properties were obtained in the principal material directions (E₁, E₂, v₁₂, v₂₁, X<sub>c</sub>, Y<sub>c</sub>). Tensile specimens of the neat Fiberite …
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Device Characterization and Compact Modeling of the SiGe HBT in Extreme Temperature Environments
… The SiGe HBT performs exceptionally at low temperatures. The device DC current gain and AC small-signal gain significantly increase in the cryogenic temperature range. Applications at low temperatures with expansive temperature range specifications need an HBT compact model to accurately …
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Super High-speed Miniaturized Permanent Magnet Synchronous Motor
… W shaft output power at 200,000 rpm and at the cryogenic temperature of 77 K. The test results showed the motor to have an efficiency reaching above 92%. This achieved efficiency indicated a significant improvement compared to commercial motors with similar ratings. This dissertation first …
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Hydrogen embrittlement of Aluminum-Lithium alloys
… study designed to investigate the effects of temperature and notch orientation on fracture behavior. Disk rupture tests were used with various gases (hydrogen and nitrogen) and three strain rates (increment of 50 psi every 20, 200 and 300 seconds) and two temperatures (room and liquid nitrogen …
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On-Chip Multiplexers for Transferable Nanomaterials: Design, Fabrication and Applications
… of nanomaterial field-effect transistors at cryogenic temperatures, is described. The channel in each transistor in the array is a nanomaterial which is transferred onto the multiplexer device, and each transistor in the array can be measured individually. The underlying multiplexer device is …
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Fabrication of silicon-based nano-structures and their scaling effects on mechanical and electrical properties
… the residual resistivity of the NiSi lines at cryogenic temperature increased with decreasing line width, indicating effect of increased electron sidewall scattering with decreased line width. A mean free path for electron transport at room temperature of 5 nm was deduced, which suggests that …
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Silicon Nanoelectronics for Quantum Metrology Standard and Cryogenic SBMOSFET
… counter for the SE pumps. Through both the room-temperature probing test as well as millikelvin temperature measurement, we found the revision significantly improved the yield and the quality of the sensor. We also successfully fabricated the pump-sensor integrated devices. In a preliminary …
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Development of intersubband terahertz lasers using multiple quantum well structures
… electron is provided by the 6-doping per module. Temperature-dependent intersubband scattering plays a key role in transport modeling and therefore the degree of population inversion. Systematic calculations were performed to address issues of hot electron effect, lattice heating, and …
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Liquid helium temperature high-speed optical data link for superconducting computing
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Numerical Study Of A High-speed Miniature Centrifugal Compressor
… is a key component of a reverse Brayton cycle cryogenic cooling system. The system is commonly used to generate a low cryogenic temperature environment for electronics to increase their efficiency, or generate, store and transport cryogenic liquids, such as liquid hydrogen and oxygen, where …
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Theoretical study on the band structure of Bi1̳-x̳Sbx̳ thin films
… band structure can be varied as a function of temperature T, pressure P and stoichiometry. The electronic band structure does not change with T significantly in the cryogenic temperature range under the atmospherical presure. The conduction band edge and the valence band edge are very close to …
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Design and fabrication of electron energy filters for room temperature inelastic electron tunneling spectroscopy
… and compact size. However, IETS requires cryogenic temperature to resolve molecular spectra, which limits its use in electronic nose application. A new theory of biological olfaction postulates that the odorant detectors inside a nose recognize an odorant's vibrations via inelastic …
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