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.
Results
Showing 1 to 20 of 22 for “"Thermal variations"”.
-
Inhabitable thermal variations
Thesis. 1978. M.Arch--Massachusetts Institute of Technology. Dept. of Architecture.
-
Análise da interação trilho-viaduto
… structure is presented. The forces are due to thermal variations and to forces caused by trains passing over the structure. The acting forces are distributed to the rails and structures by means of the ballast which is represented by a constitutive relation between relative displacements and …
-
Silicon-photonics for VLSI systems
… of microring resonators to both process and thermal variations. This thesis develops and demonstrates the pieces of a photonically-interconnected processor-to-memory system. We demonstrate a complete optical transceiver platform in a commercial 45 nm SOI process, showing that optical devices …
-
Thermal Modeling of Lithium-Ion Energy Storage Systems for Hybrid Electric Vehicles Using Computational Fluid Dynamics with Conjugate Heat Transfer
… Storage System (ESS). High temperatures and thermal variations can significantly affect a battery's performance and lifecycle. An effective thermal management system is vital to the health and safe operation of the ESS's batteries. A well designed thermal management system begins with the …
-
Analysis of laser diode bar degradation
… to facet defects, packaging-induced strain, thermal variations, and intra-cavity defects. The system has been used to quantify the relative strengths of various degradation mechanisms in a set of laser diode packages"--Abstract, page iii.
-
Combined Modeling and Experimental Validation of Boiling Curve and Critical Heat Flux
… describes the stochastic nature of the flow and thermal variations, as well as the tightly coupled bubble motion in the flow and thermal fields. This suggests that to extend the modeling of subcooled nucleate boiling to predict critical heat flux, both probabilistic formulation and stochastic …
-
Development of in-situ radiometric inspection methods for quality assurance in laser powder bed fusion
… parts experience significant geometry driven thermal variations during manufacturing. This creates microstructure and mechanical property inhomogeneities and can stochastically cause defects. Mission critical applications require part qualification by measuring the defects non-destructively. …
-
Moment analysis methods of ultrasonic waveforms to characterize the internal temperature and melt transition boundary for materials with irregular porosity.
… multitude of industries. Monitoring the internal thermal and phase states of materials is of particular interest to the petro-chemical, food, and polymer processing industries, and ultrasound has found limited investigation within the literature for such applications. In this thesis, ultrasound is …
-
The validation and improvement of route-based road weather forecasts
… spatial forecasting ability. The majority of thermal variations around the study route are well represented by the clustering solutions, presenting the opportunity for new sampling strategies with the potential to validate forecasts at a vastly improved spatial and temporal resolution. …
-
In-situ Thermal and Deformation Characterization of Additive Manufacturing Processes
… (DIC) to understand the interactions between the thermal variations and resulting deformation.</p> <p>The inclusion of a zero-bias deep neural network (ZBDNN) to classify given images can also show real-time monitoring of defects in composite prints as a realizable goal. The ZBDNN was trained to …
-
Nonlinear electromagnetic-thermal modeling using time domain finite element method in the machinery design
In this thesis, an electromagnetic-thermal co-simulation algorithm is developed for the three-dimensional modeling of electric machines. To couple electromagnetic (EM) and heat transfer processes, the time-domain finite element method is employed for its capability of modeling complex geometries. …
-
Self-Regulated Thermal Management with Shape-Memory Alloy Torsional Tubes
<p>The need for dynamic thermal management that adapts to varying system needs and requirements is a growing topic of interest in different engineering disciplines, most prominently aerospace and electronics. This demand for improved thermal management systems comes from the general increase of …
-
A variable threshold for an energy detector using GNU radio
… Noise however in practice varies randomly due to thermal variations, non-uniform movement of electrons, imperfections of semiconductor materials and external noise sources to mention a few. This creates a noise uncertainty phenomenon which negatively affects the fixed threshold approach used in …
-
Critical literature review on concrete crack repairs
… (ASR), steel reinforcement corrosion, shrinkage, thermal variations, foundation movements, soil settlement, vegetation effects and cracking related to earthquale effects. Non-destructive and destructive techniques to determine conrete cracking shall be discussed. Destructive techniques usually …
-
Design and characterization of tunable stiffness flexural bearings
… Compressed flexures are highly sensitive to thermal variations; a 0.5 C temperature increase resulted in an 11% increase in stiffness. A model developed in this thesis predicts that deviations from column straightness of 2% of the flexure thickness limit the stiffness reduction to a factor of …
-
Wafer-scale integrated active silicon photonics for manipulation and conversion of light
… while tackling wafer-scale fabrication and thermal variations. To integrate these photonics components with electronics with little to no excess energy consumption, a seamless interface between electronics and photonics wafers was introduced, through-oxide-vias (TOVs). When the …
-
Resonant Wavelength Tuning and CMOS Circuits for Silicon Photonic Transmitters with Microring Modulators
… (EO) nonlinearity and sensitivity to process and thermal variations, which can cause the resonance wavelength to deviate significantly from the laser wavelength, impacting critical metrics such as optical modulation amplitude (OMA), extinction ratio (ER), and level separation mismatch ratio (RLM). …
-
Design, fabrication and characterization of resonant waveguide grating based optical biosensors
… crucial for ultralow biosensing application with thermal or other perturbations. A RWG based dual resonance approach is proposed and verified by controlled experiments for separating the response of bulk and surface sensitivity. The dual resonance approach gives sensitivity ratio of 9.4 whereas …
-
The generation and classification of small leaks in a high pressure water system
… are monitored include vibrations, acoustics, thermal variations, moisture change, air flow and pressure adjustment leaving a predetermined outlet. The sensor outputs are pre-processed and the nonlinear data are applied to an artificial neural network, whereas the other data are applied to a …
Page 1 of 2