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 cycles"”.
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Solder Interconnect Life Prediction under Complex Temperature Cycling with Varying Mean and Amplitude
… of the power cycling of the devices and the temperature cycling from the surrounding environment. Temperature histories resultant from these concurrent loading would be a complex temperature cycling with varying cyclic temperature mean and amplitude, as well as spatial thermal gradient. This …
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An infiltration/cure model for manufacture of fabric composites by the resin infusion process
… The simulation model relates the applied temperature and pressure processing cycles, along with the experimentally measured compaction and permeability characteristics of the fabric preforms, to the temperature distribution, the resin degree of cure and viscosity, and the infiltration flow …
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Splicing The Clock Is Timeless: From Fruit Fly Behavior To Mammalian Retinal Degeneration
Circadian rhythms synchronize intrinsic cycles of physiology and behavior with diurnal environmental oscillations of light and temperature. Circadian transcription-translation feedback loops (TTFLs), in which the rhythmic expression of core clock proteins negatively regulates their own expression, …
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Integration of Light and Temperature in the Regulation of Circadian Gene Expression in Drosophila
… environment via inputs from both daily light and temperature cycles. Previous molecular and behavioral studies in Drosophila have largely focused on light-dependent regulation of circadian clocks and their outputs. Although light is the strongest and best understood Zeitgeber for the circadian …
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Refurbished and 3D Modeled Thermal Vacuum Chamber
… of the system. The full system was able to reach temperatures as low as -38ºC and as high as 58ºC at a pressure of 10-6 Torr. The ATS Chiller was able to absorb up to 500W of heat dissipation from a component mounted to the platen inside of the vacuum chamber.</p> <p>Thermal modeling of the …
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Simulation of Enviro-mechanical Durability for Life Prediction of E-Glass/Vinyl Ester Composites using a Bridge Service Environment
… of the composite were studied as a function of temperature and moisture. Damage accumulation was studied as a function of cyclic loading and temperature cycles. The enviro-mechanical conditions, including moisture, temperature and fatigue loading, were then used in a computer simulation to …
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Plant-Like Cryptochrome Does Not Promote Blue Light-Induced Resetting of the Circadian Clock in <i>Chlamydomonas Reinhardtii</i>
… time cues such as the daily light/dark and temperature cycles. The unicellular green alga <em>Chlamydomonas reinhardtii</em> is a useful model organism for circadian clock research. It shows several well-characterized circadian rhythms of behavior, and the monitoring of its rhythm of …
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Action Spectrum for Photoentrainment of the Circadian Clock in Wild-Type <i>Chlamydomonas reinhardtii</i>
… time cues such as the daily light/ dark or temperature cycles. <em>Chlamydomonas reinhardtii</em> is an ideal model organism for research on the circadian clock, because it shows several well-characterized behaviors that exhibit a circadian rhythm. Its circadian rhythm of phototaxis …
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Exploring circadian rhythms, food intake, and their interactions in marine invertebrates
… clocks, I test the effects of various light and temperature regimes on circadian rhythms in the sea anemone Nematostella vectensis. Misaligned light and temperature cycles severely disrupt behavioral rhythms and substantially alter the rhythmic transcriptome, particularly the expression of genes …
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Investigation of residual stresses in the laser melting of metal powders in additive layer manufacturing
… controlled by a CAD model. During LM, rapid temperature cycles and steep temperature gradients occur in the scanned layers. Temperature gradients induce thermal stresses which remain in the part upon completion of the process (i.e. residual stresses). These residual stresses can be …
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THE STUDY AND CHARACTERIZATION OF A NEW PROCEDURE FOR APPLYING CARBIDE COATINGS TO GRAPHITE FURNACES USED IN ATOMIC ABSORPTION SPECTROSCOPY
… to metal oxide, the furnace is fired at high temperature to form the carbide. Three metal chlorides, TiCl(,4), MoCl(,5) and WCl(,6), were used to apply TiC, MoC and WC coatings, respectively. Experimental details of the coating procedures are given.</p><p>Characterization of the various …
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Exploring circadian rhythms, food intake, and their interactions in marine invertebrates
… clocks, I test the effects of various light and temperature regimes on circadian rhythms in the sea anemone Nematostella vectensis. Misaligned light and temperature cycles severely disrupt behavioral rhythms and substantially alter the rhythmic transcriptome, particularly the expression of genes …
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Evolution of Preconsolidation Pressure of Normally Consolidated Clays Over Full Temperature Range
While it has been established that temperature can change the preconsolidation pressure of clays, the current understanding is limited to specific ranges of temperatures, with temperatures above freezing being studied entirely independently of temperatures below freezing. However, as temperature is …
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Novel amphiphilic diblock copolymers by RAFT-polymerization, their self-organization and surfactant properties
… Nevertheless, due to the low glass transition temperature of the core-forming block, unimer exchange occurs between the micelles. Despite the dynamic character of the polymeric micellar systems, the aggregation behavior is strongly dependent on the history of the sample, i.e., on the …
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Design and Characterization of Liquid Metal Flip Chip Interconnections for Heterogeneous Microwave Assemblies
… incorporating a metal, which is liquid at room temperature, mitigates the possibility of such thermo-mechanical failures. Additionally, liquid metal, flip chip interconnections allow for room temperature assembly, simplifying assembly and rework processes. This dissertation focuses on the design …
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THERMAL FATIGUE DAMAGE OF ASPHALT PAVEMENT
… Like traffic loading, repeated day-night temperature cycle causes damages in AC. Damage due to a single day-night temperature fluctuation may be small. However the accumulated damage due to a large number of day-night temperature cycles may not be small. In this study, fatigue damage due …
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Degradation modes of the top-side contacting of SiC power semiconductors
… densities, switching frequencies, and operating temperatures, two module types—aluminum modules (aluminum bond wires, aluminum metallization) and copper modules (copper bond wires, copper metallization)—were designed, fabricated, and tested using active power cycling. Modules were subjected to …
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Photoperiodic time measurement and seasonal adaptation of the southwestern corn borer, Diatraea grandiosella Dyar (Lepidoptera : Pyralidae)
… et al. (1976) have studied the photoperiodic and temperature control of the seasonal life cycle and diapause determination of D. grandiosella. They found that (1) diapause induction and termination are controlled by photoperiod and temperature; (2) chilling is not required for diapause …
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Seasonal regulation of the circadian rhythms of behavioural temperature selection and locomotor activity in Australian sleepy lizards (Tiliqua rugosa, gray; reptilia: scincidae)
… in mediating seasonal adjustments in the body temperature and locomotoractivity patterns in the Australian sleepy lizard, Tiliqua rugosa (Gray 1827). The first component of this study investigated whether daily rhythms of behavioural thermoregulation and locomotor activity that T. rugosa …
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