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 28 for “"low absorption"”.
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Low Absorption Liquid Crystal Materials for Midwave Infrared
… infrared liquid crystal is inherently large absorption loss. To reduce absorption, some molecular engineering approaches have been considered, such as deuteration, fluorination, and chlorination. The fluorine and chlorine not only act as the polar group to provide dipole moment but also helps …
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Development of antenna-coupled metal-insulator-metal diodes for infrared detection
… blackbody radiation peak of the human body and a low absorption window in the earth’s atmosphere. Also, at 10 µm wavelength, the earth’s terrestrial radiation is maximized and provides a good opportunity for untapped energy harvesting. These two factors combine to make a very strong need for a …
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The study of photo-thermal lensing system and its applications
The high quality optical films in coatings with low absorption and good environmental stability are required for the development of high power lasers, because even slightest absorbing defects could lead to material's breakdown. Thus, a non-destructive absorption measurement is required to measure …
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Modeling Compact Non-Volatile Photonic Switching Based on Optical Phase Change Material and Graphene Heater
… as Ge₂Sb₂Te₅ (GST) introduce significant optical absorption loss, leading to elevated insertion losses in devices. Current approaches, compensating for this loss through weak evanescent light-PCM interactions, result in larger footprint devices. A compact non-volatile 2 × 2 switch design is …
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New optical materials containing isobenzofuran
… These dyes, the IBF-NIADs, exhibit red-shifted absorption and emission over corresponding isothianaphthene containing dyes, thus highlighting the effective proquinoid nature of isobenzofuran. With the fundamentals of the IBF-NIAD dyes developed, we then expanded the series into a library of …
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Ligas à base de ferro-titânio para aplicações de armazenamento de hidrogênio
… Among these, titanium-iron alloys (TiFe) present low cost and good cycling, but low absorption capacity and difficult activation. With addition of transition elements, H2 absorption occurs at room temperature, under moderate pressure and without the need for heat treatments for activation. In this …
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Developing Novel Nanoparticulated Imaging System using Luminescence Enhancement of Eu(III) and TB(III) by Single-Strand DNA Encapsulation
… of these two lanthanides is weak due to low absorption cross sections. Conversely, the emission of both trivalent ions, upon irradiation, in aqueous solution, is strong when bound to complex ligand systems. The luminescent enhancement is the result of energy transfer (EnT) and the binding …
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Adaptive Fiber Source for Label-free Nonlinear Microscopy
… several cellular functions. Due to the low absorption cross-section of the two-photon and three-photon excitation processes, especially for the endogenous fluorophores, high peak power broadband laser sources are important in improving nonlinear microscopy generation efficiency. …
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A kinematic coupling based 6 degrees of freedom dynamometer
… clamps. Frictional forces affect hysteresis, absorption and settlement of the coupling. Different solutions have been designed and tested to reduce friction. First, we tried direct contact between three stainless-steel rods and the stainless-steel load cells. The results were fully distorted …
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Self-heating control of edge emitting and vertical cavity surface emitting lasers
… operation are Joule heating and free carrier absorption loss. To control device self-heating, the epi structure needs to be designed with low electrical resistance and low absorption loss, while the heat flux must spread out of the device efficiently. This dissertation presents the control of …
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Direct measure of band edge optical absorption of silicon nanostructures using photothermal deflection spectroscopy
… In this thesis, I studied the band edge optical absorption of free standing Si-NPs and Si-NPs in an amorphous silicon matrix, a composite material also known as nano-crystalline silicon (nc-Si:H). In general, it is difficult to directly observe the absorption threshold in these materials because …
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Advanced nanofabrication of thermal emission devices
… photonic crystal structure in a high-dielectric low-absorption material such as silicon. This type of fabricated resonant thermal emitter has great potential for use as near-IR and IR sensors. Theory has also shown that selective thermal emitters fabricated in tungsten with a 2-dimensional …
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Resonant photonic crystal photodetectors for the infrared in silicon
… CMOS processes; silicon's lack of strong absorption at the wavelengths of interest makes this challenging. The approach uses defect-state mediated linear absorption and two-photon absorption (TPA) in small mode-volume resonators to generate photocarriers. Such resonators allow efficient …
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Design and comparative performance evaluation of novel mobile handset antennas and their radiative effects on users.
… (3G) systems require long operation time, low weight and cost for terminals, as well as improved link quality.<br/><br/>For this reason a good efficiency and low profile antennas with low absorption losses by the user are desirable. The Planar Inverted-F Antenna (PIFA) is shown to result …
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Development of dissolving and hydrogel-forming microneedles for delivery of vancomycin hydrochloride
… of needle-stick injuries. Vancomycin displays low absorption when administrated orally, due to the large molecular weight and low permeability in the gastrointestinal tract. As a consequence, utilising a novel transdermal drug delivery system to deliver vancomycin could prove a promising …
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Iron-oxide catalyzed silicon photoanode for water splitting
… respect to electrolyte pH. As opposed to the low pH, a high pH electrolyte allows the silicon valence band edge to be located below the oxygen evolution potential, providing physical platform for the water oxidation reaction. In this platform, the introduction of a thin iron-oxide layer was …
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Development of Advanced Delivery Systems for Microbicides
… no safety concerns towards renal toxicity but low absorption from gel formulation is a concern. Formulations based on combination of microbicides was found to be more effective than formulations based on single microbicide. A primary focus of this dissertation research project is to design and …
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Development of a PBPK-based health risk assessment framework for exposure to cerium, gold, silver and titanium engineered nanoparticles
… IT instillation, and oral exposure routes due to low absorption. PBPK models were proven to be good risk assessment tools to determine biokinetics of various types and sizes of nanoparticles as proven by the ceria, gold, silver and titanium nanoparticles PBPK models we studied. There was good …
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Novel diode laser absorption techniques for combustion diagnostics
… now preferred over on extractive sampling, followed by analysis using techniques such as gas chromatography. In this thesis two laser absorption measurement techniques are applied to measure the soot distribution, and acetylene concentration profiles in a flat-flame burner. The in-situ …
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The absorption of vitamin D3 from soy protein nanoemulsions
… is often compromised by its rapid degradation, low absorption, and poor water solubility. Nano-encapsulation technologies could prove useful to address the shortcomings of current fortification vehicles. In this study, soy protein isolate was conditioned using pH shifting and ultrasound …
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