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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 40 for “"uniaxial strain"”.
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Uniaxial Strain Effect on Graphene-Nanoribbon Resonant Tunneling Transistors
… dissertation has been to study the effect of the uniaxial strain on the graphene nanoribbon resonant tunneling transistors (RTTs). The uniaxial strain may be induced either by an external stress applied to the graphene in a particular direction or by a substrate due to deposition of graphene on …
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Impact of uniaxial strain on P-channel 111-V quantum-well field effect transistors
… carrier injection velocity. With the benefits of strained Si having been exhausted, n-channel I-V quantum-well field effect transistors (QW-FETs) show promising potential as a post-Si CMOS logic technology. To implement complementary circuits, achieving a high-performance p-channel III-V …
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Enhancement of antimonide-based p-channel quantum-well field effect transistors using process-induced sprain
… This thesis examines the use of process-induced uniaxial strain combined with biaxial strain introduced during growth of the heterostructure as an approach to enhance antimonide-based FETs. Using a compressively stressed silicon nitride layer to induce uniaxial strain in the device, stressed …
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A powder neutron scattering study of magnetism in potassium copper trifluoride as a function of hydrostatic pressure
… to be due to a spin reorientation caused by a uniaxial strain component caused by using a clamp cell. Single crystal measurements also identified that the Néel temperature increased by approximately 1.6 K with 1.07 GPa applied pressure. We were motivated to further investigate the magnetic …
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Magnetoelectric Effect in Ferroelectric-Ferromagnetic Heterostructures
… can be magneto-electrically coupled via elastic strain mediation. Bulk magnetoelectric composites have been intensively studied as magnetic sensors due their significant magnetic-to-electric signal transforming efficiency, which promises high magnetic field sensitivity. In contrast, electric …
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LABORATORY INVESTIGATION OF COAL PERMEABILITY UNDER REPLICATED IN SITU STRESS REGIME
… vertical direction; that is, the coal is under uniaxial strain conditions. However, most laboratory studies completed to estimate the changes in coal permeability have used triaxial state of stress, thus violating the underlying principles of the models. An experimental study was, therefore, …
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Experiments on powder metals
… of triaxial compression, torsion ring shear, uniaxial strain compression, and simple compression test systems has been conducted to investigate the room temperature deformation response of powders ranging from a relative density of n = 0.4 - 0.9. A torsion ring shear apparatus has been …
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Band-to-band tunneling in silicon diodes and tunnel transistors
… work studies the effect of mechanically applied uniaxial strain on reverse-bias band-to-band tunneling current in n+/p+ vertical silicon diodes fabricated on {100} and {110} substrate orientations. The Band Structure Lab and nextnano are used to analyze the change in band structure with uniaxial …
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Spectroscopic Measurements of Doping and Strain at Two-Dimensional Material Interfaces
Measurements of charge doping and mechanical strain in graphene have shown a strong dependence on the graphene source, transfer method, and substrate choice. Here I report Raman spectroscopy measurements of chemical vapor deposition (CVD) grown graphene transferred to a number of relevant …
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Hole transport in strained SiGe-channel MOSFETs : velocity in scaled devices and mobility under applied mechanical strain
… scaling of CMOS has been supplemented with strain to boost transistor drive current. Future CMOS technology nodes (i.e. beyond the 32 nm node) will require more significant changes to continue improvements in transistor performance. Novel CMOS channel materials and device architectures are …
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A Softened Membrane Model for UHPC (SMM-UHPC)
… found that the decomposition between biaxial and uniaxial strain fields, commonly used in SMM, may be of less significance for UHPC. Comparisons with shear panel tests were used to evaluate the accuracy of SMM-UHPC and quantify the significance of key model parameters. Combining analytical and …
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Characterization of Resistance Change in Stretchable Silver Ink Screen Printed on TPU-Laminated Fabrics Under Cyclic Tensile Loading
… fabric, were subjected to 1000 cycles of 20% uniaxial strain. In-situ resistance measurements of printed traces were processed to generate datasets of maximum and minimum resistance per cycle. A mechanistic fit model was used to predict the resistance behavior of the ink across TPU/fabric …
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PRELIMINARY EXPERIMENTAL AND MODELING STUDY OF PRESSURE DEPENDENT PERMEABILITY FOR INDONESIAN COALBED METHANE RESERVOIRS
… with depletion and the corresponding volumetric strain of coal were measured in the laboratory under uniaxial strain condition (zero lateral strain). Two gases, helium and methane, were used as the flowing fluids during experimental work. The results showed that, decreasing pore pressure resulted …
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Evaluating the Electrical Response of Polyaniline to Mechanical Strain
… output of polyaniline films subjected to uniaxial strain in hydrochloric acid solutions. Polyaniline belongs to novel class of materials known as conducting polymers. Alternating single and double bonds in the backbone of conducting polymers allow them to transmit electric charge when they …
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The effects of strain on carrier transport in thin and ultra-thin SOI MOSFETs
… and ultra-thin body relaxed SOI and biaxially strained SOI MOSFETs were constructed and measured with and without the application of mechanical uniaxial strain to examine the interaction between strain and thin-film effects.
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Optical, electronic, and dynamical phenomena in the shock compression of condensed matter
… the crystal bandgap under hydrostatic stress, uniaxial strain, and shear strain for pure and defective materials. In all cases, the bandgap is not lowered enough to produce a significant population of excited states. In Chapter 3, a new multi-scale simulation method is formulated for the study …
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Uniaxial and triaxial behavior of high strength concrete with and without steel fibers
… experimental research program on the true uniaxial and triaxial compression behavior for both high strength concrete (HSC) and steel fiber reinforced high strength concrete (SFHSC). The experimental study mainly focuses on the octahedral shear stress strain relationship of those two types …
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Quasi-Static Structural Analysis of an Experimental Aircraft Wing
… on the wing structure to determine critical strain locations and optimal sensor distribution. Subsequent mechanical experimentations are performed using a bending test to measure the strain at critical locations along the wing structure using resistive uniaxial strain gauges. To verify the …
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Transport enhancement techniques for nanoscale MOSFETs
… carrier velocity beyond what is achieved with uniaxially strained silicon, along with dramatic reduction in the device parasitics. Such innovations are needed as early as the 32-nm node to avoid the otherwise counter-scaling of the performance. The prospects and limitations of various …
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Interplay of Geometry and Mechanics: Disordered Spring Networks and Shape-changing Cerebella
… reports work in three topics - I) isotropic strain-induced rigidity transitions in under-constrained spring networks II) uniaxial strain-induced stiffening transitions in semiflexible networks with area-conserving inclusions and III) non-linearities in the buckling without bending …
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