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 22 for “"Temperature Insensitive"”.
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Temperature-insensitive line ratios
… to extract elemental abundance ratios using temperature-insensitive ratios of x-ray line fluxes for a collisionally ionized plasma. This method is then refined using more realistic plasma models for coronae of active stars. We finally apply the method to multiple sources and compare the …
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Temperature insensitive fiber optic interferometer and applications
… tapered coupler to produce a relatively temperature insensitive Michelson interferometer is presented. The modification was accomplished by cleaving the coupler after the minimum taper region and polishing, perpendicular to the endface, to a point just short of the interaction region. …
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A temperature insensitive low noise RC relaxation oscillator
A 50 kHz temperature insensitive RC relaxation oscillator is presented. A novel RC branch, which has a zero temperature coefficient (ZTC) point in its charging curve, is used so that the period of the oscillator is insensitive to temperature variation. With the absence of current source in the RC …
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Design techniques for temperature insensitive, low phase noise oscillator
… performance and excellent stability against temperature, voltage and process variation. However, due to incompatibility with silicon integration and high power consumption, they are not suitable for biomedical devices which require long battery lifetime, low cost and especially small size but …
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Development of a temperature insensitive current controlled current source for LNA bias circuit applications
… the analysis, design and development of a novel temperature insensitive Current Controlled Current Source (CCCS), in bipolar technology, in order to provide accurate amplification of a Proportional To Absolute Temperature (PTAT) reference current. The output current of the CCCS is intended for …
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Low Power Adaptive Circuits: An Adaptive Log Domain Filter and A Low Power Temperature Insensitive Oscillator Applied in Smart Dust Radio
… for system identification. The other is a temperature insensitive oscillator for low power radio frequency communication. The adaptive filter is presented with integrated learning rules for model reference estimation. The system is a first order low pass filter with two parameters: gain and …
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Optical Deformation of Emulsion Droplets
… disadvantage of the systems used was the strong temperature-dependence of the interfacial tension. I have explored options for creating temperature-insensitive microemulsions, and have shown that a mixed surfactant system containing docusate sodium salt (AOT) and pentaethylene monododecyl ether …
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Coronal properties of pre-main sequence stars in the Orion Trapezium Cluster
… We fit plasma models to the spectra, calculated temperature-insensitive elemental abundances from individual spectral line fits, determined common elemental abundances to refit the data, and computed confidence maps for pairs of model parameters. These results may provide insights into the …
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Semiconductor quantum dot lasers.
… external quantum efficiency of $\sim$8.5% at low temperature with a peak power greater than 200 milliwatts demonstrate good size distribution and high gain in these high-quality QDs. At low temperatures, the lasing threshold currents are found to be more temperature insensitive than for …
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Design of a Resistance-Based High Temperature Liquid Metal Flow Meter
… is a parameter that is vital to measure in high temperature pumped liquid metal systems, yet traditional flow meters are unable to perform at these extreme conditions. As a part of the Atomic Simulation & Energy (ASE) Research Group here at MIT, this research seeks to develop a flow meter able to …
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Terahertz quantum cascade lasers
… scattering. This mechanism is efficient and temperature insensitive, and provides protection from thermal backfilling due to the large energy separation between the lower radiative state and the injector. Both properties are important in allowing higher temperature operation at longer …
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Remote three-dimensional temperature sensing using planar laser induced fluorescence : development and applications to microwave heated liquids
… in application by difficulties in measuring temperatures and temperature distributions during the microwave heating process. This thesis describes the development of a 3D imaging fluorescence thermometry system that was used to examine temporal and spatial variations in temperature within …
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An Investigation into the Effects of Alterations in Ribosomal Proteins S4 and S5 on Translational Accuracy, Ribosomal RNA Processing, and Ribosome Assembly
… S5 protein and C-terminal truncated mutants are temperature sensitive, have a ribosome assembly defect and are error-prone. We obtained temperature insensitive S4 mutants with restored C-termini that partially rescued miscoding but almost completely rescued the ribosome assembly defect at 42˚C. …
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Wavelength agnostic WDM strategies for avionic telecommunications
… challenge with respect to the operational temperature range. Over this range it is desirable to minimise any additional weight and power consumption associated with cooling network components. One technique assessed to implement WDM with minimised cooling is to use spectrum slicing to seed …
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Properties and sensing applications of long-period gratings
… normal and anomalous. The fabrication and high temperature annealing of these devices is detailed, and a novel method to obtain these gratings without employing ultra-violet radiation is presented. Long-period gratings are proposed as simple yet versatile optical fiber sensors. It is …
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Analysis and Applications of Microstructure and Holey Optical Fibers
… the holey fibers, it was noticed that robust temperature-insensitive pressure sensors can be made with these fibers. This offers an opportunity for new low-cost and reliable pressure fiber-optic sensors. Incorporating gratings into holey fibers in conjunction with the possibility of dynamic …
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Cotranslational Folding of CFTR
… the ionizable side chain, which correlates with temperature insensitive ER accumulation. By contrast, G91R does not destabilize TM1, which correlates with temperature sensitive ER accumulation. Both mutants were then identified to perturb TMD1 in a manner recognizable by the cell. Finally, …
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Genetic Dissection of Synaptic Vesicle Endocytosis
… absence of dynamin 2 was assessed at both room temperature and 32 oC. At both temperatures, my results reveal that synaptic vesicle recycling functions independent of dynamin 2 but also, the kinetics of single vesicle recycling is unaffected by changes in temperature suggesting that a single, …
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Mast Cell Histamine Release Induced by Portuguese Man-of-War (Physalia) Venom
… the presence or absence of calcium, at different temperatures, and with ATP depleted and ATP supplied mast cells. Following treatment the samples were assayed fluormetrically for both released histamine and released lactate dehydrogenase, a cytoplasmic enzyme marker.</p> <p>Physalia venom causes …
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Nonlinear photonics with applications in lightwave communications
… this doctoral dissertation, a novel design for a temperature insensitive MZI is presented. Temperature dependence is one of the main challenges in the design of the SOI platform due to the large thermo-optic coefficient of its core material. A change in temperature can cause the device properties …
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