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 21 for “"Hysteresis behavior"”.
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A THREE-DIMENSIONAL FULLY COUPLED HYDRO-MECHANICAL ELASTO-PLASTIC MODEL FOR UNSATURATED SOILS WITH CONSIDERATION OF HYSTERESIS BEHAVIOR
… seasonal wetting-drying cycles. While mechanical hysteresis is a common feature of soils in general, hydraulic hysteresis is associated with unsaturated soils. Most existing constitutive models paid limited attention to the mechanical and hydraulic hysteresis behavior of unsaturated soils. This …
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Simulative Analyse zum Hystereseverhalten von Phasenwechselmedien in Latentwärmespeichern anhand des thermischen Leistungsverlaufs
… modeling stage. A special property of PCM is the hysteresis, which describes the phenomenon that the crystallization process takes place at a lower temperature than the melting process. The model-based consideration of the hysteresis behavior requires a high implementation effort, since it is …
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Molecular orientation and relaxation behavior in flexible water- blown polyurethane foams
… were studied to better understand the relaxation behavior and the molecular orientation upon deformation in these systems. The two main experimental techniques used in this investigation were stress relaxation in tension and deformation-IR dichroism. The stress relaxation in the foams and their …
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Technological Solution beyond MOSFET and Binary Logic Device
… memcapacitor is an emerging device that exhibits hysteresis behavior, which can be manipulated by external parameters, such as, the applied electric field or voltage. One of the unique properties of the memcapacitor is that by using the percolation approach, we can achieve …
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Characteristics of Active Combustion Control for Liquid-Fuel Systems with Proportional Primary Fuel Modulation
… are defined based on the degree of saturation. A hysteresis behavior is also found to exist for the controller settings depending on whether stability is being maintained or realized for an unstable system. The second part of this work focuses on the impact that primary fuel modulation has on the …
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PI AND EMI ANALYSIS OF 3D IC SYSTEM WITH TSVS AND CO-PACKAGED OPTICS
… and light-intensity-dependent hysteresis behavior of a through-silicon-vias (TSV) structure in 3D IC and analyzing its effect on the power integrity of a system with 3D IC.</p> <p>This second paper investigates the scaled tendency of the emissions in a router system loaded with …
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Finite strain behavior of polyurea for a wide range of strain rates
… structural crash. In order to investigate its behavior of hysteresis as well as rate-sensitivity, three different testing systems are used to cover a wide range of strain rates up to strain of 100%. In view of impact and blast events, the virgin state of polyurea is considered throughout the …
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Synthesis and Characterization of Surface-Functionalized Magnetic Polylactide Nanospheres
… and superparamagnetic (lack of magnetic hysteresis) behavior. For in-vivo applications, it is important that the magnetic material be coated with biocompatible organic materials to afford dispersion characteristics or to further modify the surfaces of the complexes with biospecific …
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Effect of Hysteresis Type on Drift Capacity for Global Collapse of Moment Frame Structures for Seismic Loads
It is conjectured that different hysteresis behavior in moment frames subjected to seismic loads may lead to different levels of response because of degradation in strength and stiffness. To examine the existence and magnitude of this effect, this research aims to: (1) Determine the global collapse …
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Modified Maxwell Model for hysteresis compensation of piezoelectric stack actuators
This thesis presents new observations of the hysteresis behavior of piezoelectric stack actuators and proposes an Input-Range Dependent Maxwell Model for more accurate hysteresis compensation. Experimental studies show that the assumptions of the classical Maxwell model do not fully hold: the …
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Synthesis and Characterization of Polylactide-siloxane Block Copolymers as Magnetite Nanoparticle Dispersion Stabilizers
… and superparamagnetic (lack of magnetic hysteresis) behavior. For in-vivo applications it is important that the magnetic material be coated with biocompatible organic materials to afford dispersion characteristics or to further modify the surfaces of the complexes with biospecific …
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Metallorganic chemical vapor deposition of lead oxide and lead titanate
… was two-fold: firstly, the MOCVD deposition behavior of Pb(thd)2 was studied in detail and a one-dimensional kinetic model was proposed to successfully predict the effect of processing conditions on the deposition rate profile for PbO. Assuming the surface reaction is the rate-limiting step …
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A Case Study on Medium and High Rise Timber Buildings
… actions are evaluated. The connection’s hysteresis behavior is evaluated after applying the reduction factor. Furthermore, A parametric study is performed for two damping values. This thesis provides a conclusive study between heavy timber and LFW that discusses the ability of heavy …
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EXAMINATION OF PRECAST CONCRETE DIAPHRAGM SEISMIC RESPONSE BY THREE-DIMENSIONAL NONLINEAR TRANSIENT DYNAMIC ANALYSES
… conditions in 3D, incorporating proper hysteresis behavior for the diaphragm reinforcement, and developing appropriate lateral force resisting system (LFRS) models. A sensitivity analysis is performed for 3D NLTDA modeling to assist in creating an appropriate model.(2) Application of the …
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Modeling the Greenland Ice Sheet response to climate change in the past and future
… investigated. It was found that the GIS exhibits hysteresis behavior (i.e., it is multi-stable under certain conditions), and that a temperature threshold exists above which the ice sheet transitions to an essentially ice-free state. The threshold in the global temperature is estimated to be in …
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Computational modeling of intrinsic dissipation in nano-structure
… model is considered to understand this novel behavior. We, also, investigate the role of tension on the Q factor, a measure of the inverse of dissipation rate. From these studies, we conclude that Akhiezer dynamics plays a dominant role in nano-resonators. We, then, develop a quasi-harmonic …
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Interfacial Mechanics in Fiber-Reinforced Composites: Mechanics of Single and Multiple Cracks in CMCs
… the stress/strain relations and unload/reload hysteresis behavior during the evolution of multiple matrix cracking. The random spacings between the matrix cracks as well as the crack interactions are taken into account in the model. The procedure to obtain the interfacial sliding resistance, …
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Ferroelectric System Dynamics and the Properties of Ferroelectric / Two-Dimensional Electron Gas Heterostructures: a Ginzburg–Landau Study
… model, we simulate the dynamic polarization hysteresis behavior of a ferroelectric system subjected to a sinusoidal electric field. We examine polarization hysteresis loop structure as a function of both field amplitude and field frequency. The relationship between the latter and hysteresis …
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A modeling framework for characterizing root exudation-driven geochemical dynamics in the Critical Zone
… concentration vs leaching flux indicates hysteresis behavior. This work demonstrates the importance of systematically incorporating root exudates into hydrobiogeochemical models and can serve to inform experimental design for shallow subsurface CZ processes. Although many insights can be …
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Analysis of Glubam Joint Behavior and Truss Model Updating Based on Optimization Algorithms
… material properties, research on the hysteretic behavior of glubam structural joints and the seismic performance of glubam composite truss systems remains insufficient. Comprehensive design theories and reliable numerical modeling approaches are still lacking. Moreover, integrating artificial …
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