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 24 for “"APDS"”.
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The Security of Self-Differencing Avalanche Photodiodes for Quantum Key Distribution
… detectors, often avalanche photodiodes (APDs), as they are directly exposed to the optical channel. Whilst measurement-device-independent QKD removes detector vulnerability from the system, secure key rates with this technique can be much lower than point-to-point links. As such, …
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Fabrication and characterization of avalanche photodetectors
… however, a two-dimensional array of APDs is required, and there are many fabrication issues involved in making such an array over a large area. In this work, fab- rication and characterization of 32 × 32 arrays of InP (indium phosphide) based separated absorption, charge, and …
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Modeling and engineering impact ionization in avalanche photodiodes for near and mid infrared applications
Avalanche photodiodes (APDs) are the preferred photodetector in many applications in which low light levels need to be detected. The reason why APDs are important in such applications is due to their internal gain, which improves the APD's sensitivity. Compared to receivers based on PIN …
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Understanding the impacts of antipsychotic pharmaceuticals on behaviour in fish
… and particularly antipsychotic drugs (APDs), represent an emerging environmental concern due to their pseudo-presence, bioaccumulative potential and potency in modulating central nervous system (CNS) targets. APDs act on evolutionarily conserved monoaminergic, adrenergic, histaminergic, …
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Linear Mode CMOS Compatible p-n Junction Avalanche Photodiode for Smart-lighting Applications
… waveguide detectors and avalanche photodiodes (APDs). This thesis focuses on the APD design and fabrication component of the sensing capability required by smart-lighting systems. Silicon CMOS compatible APDs are expected to provide high-speed and high-sensitivity sensors in terms of simplicity …
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Thermal Hydrolysis of LCFAs and Influence of pH on Acid-phase Codigestion of FOG
… sulfate. Semi-continuous, acid-phase digesters (APDs) under different pH conditions were studied in order to understand the effects of pH on FOG degradation. Increases in soluble chemical oxygen demand (SCOD) were observed in all APDs. However, the APDs with pH adjustment appeared to perform …
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A CCD based curvature wavefront sensor for Adaptive Optics in Astronomy
… in Curvature AO-Systemen Avalanche Photodioden (APDs) als Detektoren verwendet, da sehr kurze Belichtungszeiten (200 Mikrosekunden) und ein sehr niedriges Ausleserauschen des Detektors nötig sind. Aufgrund von Fortschritten in der Herstellungstechnologie von Charge Coupled Devices (CCDs) …
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Antipsychotic drugs for the treatment of acute schizophrenia after the first episode
Background: Antipsychotic drugs (APDs) represent the treatment of choice for psychotic disorders, but uncertainty surrounds the optimal selection of agents. Methodology: This was a mixed method study which included a systematic review and psychiatrists’ opinion survey. The systematic review focused …
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Development of high-performance front-illumination III-N avalanche photodiodes by metalorganic chemical vapor deposition
Gallium nitride (GaN) avalanche photodiodes (APDs) having large direct band-gap energy of ~3.5 eV at 300K can exhibit a high sensitivity in the ultraviolet (UV). They are appropriate candidates for many applications because of their capability of operation in the near-UV and visible-blind spectral …
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T cell phenotyping of a mouse model of Activated PI3Kdelta syndrome
Activated PI3Kdelta Syndrome (APDS) is immunodeficiency caused by a heterozygous gain-of-function mutation (E1021K) in the PIK3CD gene, encoding for the p110delta catalytic subunit of phosphoinositide 3-kinase (PI3K). APDS patients are lymphopenic, suffer from sinopulmonary infections and from …
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EXCESS NOISE STUDIES ON AVALANCHE PHOTODIODES
… Commercially available avalanche photodiodes (APDs) could be illuminated over the wavelengths 420 nm to 2 gm and the noise current spectrum from 10 Hz to 10 kHz could be measured by a phase sensitive detection system. The noise above normal shot noise in germanium, silicon, and …
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Communication-Theoretic Foundations for Optical Receivers Using Dynamically Biased Avalanche Photodiodes
… to reduce cost. Avalanche photodiodes (APDs) are commonly used photodetectors in many high-speed optical receivers due to their internal optoelectronic gain, which allows the photogenerated current to dominate the thermal noise without the need for optical pre-amplification of the …
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Nonlinear optics for frequency-doubling in nanosatellite laser communication
… For links at extreme ranges, where linear-mode APDs are insufficient and photon-counting Geiger-mode APDs are required, frequency-doubling can provide up to 10 dB of channel capacity improvement. Additionally, frequency-doubling shows promise as a means to allow CubeSats and nano/microsatellites …
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PI3Kδ in B cell Homeostasis and Transformation
… in PIK3CD drives Activated PI3Kδ Syndrome (APDS), a primary immunodeficiency with increased risk of pulmonary infection, autoimmunity, and B cell lymphoma development. This thesis explores the role of hyperactive PI3Kδ in B cell homeostasis, maintenance, and malignant transformation. The …
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Experiences of Residency Program Directors in Their Roles: Exploring Well-Being Through Burnout and Engagement
… approach to explore the experiences of PDs and APDs as they encountered burnout, engagement, and every combination in between through their multifaceted, roles, responsibilities, and tasks embedded in their institutional context and personal lives. Phase 1 participants (n=3) included two PDs and …
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Harnessing synergy between BCL6 and PI3Kδ to generate a new mouse model for lymphoma
… in PI3Kδ, called Activated PI3Kδ syndrome (APDS) commonly develop autoimmunity, lymphoproliferation, and lymphoma. PIK3CD is also among the most commonly mutated genes in Diffuse Large B cell lymphoma (DLBCL). The most commonly studied mouse model of DLBCL was generated by knocking a BCL6 …
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Ultrasonication as an abiotic elicitor - effects on antioxidant capacity and overall quality of romaine lettuce
… The effect of ultrasound treatment at low APDs on antioxidant capacity and overall quality of Romaine lettuce was evaluated. Whole leaf lettuce was treated with ultrasound (25 kHz) at APD of 26 W/L for 1 - 3 minutes and stored at room temperature for up to 150 hours. Quality indices …
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Measurement of double longitudinal asymmetries, A_{LL}, for pi0 production in polarized pp scattering at low Bjorken-x
… energy deposits in the Avalanche Photodiodes (APDs) which are reading the light from the MPC PbWO4 crystals. Using new scaler boards developed by Lawrence Berkley Laboratory, methods to determine relative luminosities were further refined resulting in systematic errors below 10⁻⁴ and well below …
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Fundamental Importance of Fillers, Cure Condition, and Crosslink Density on Model Epoxy Properties
… treated with 3- aminopropyldiethoxymethylsilane (APDS) and 3-aminopropyltriethoxysilane (APTS) coupling agents. The filler and coupling agents decreased the mobility of the polymer chains in the vicinity of the filler leading to an increase in the activation energy for the glass transition and an …
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Silicon Photomultipliers as Free Space Optical Communication Sensors
… as a receive optical sensor. SiPMs are arrays of APDs operated in Geiger mode, characterized by nanosecond output pulses and gains in the order of 106 electrons per photon. This thesis proposes using a SiPM in a 2x2 pixel configuration as a dual pointing and communication sensor for FSOC terminals …
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