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 69 for “"compressive strain"”.
-
Experimental determination of material properties for materials subjected to high compressive strain rates
… properties for materials subjected to high compressive strain rates using the split Hopkinson bar is discussed along with the assumptions made and their meanings. Some preliminary results for a lucite material are used to illustrate the type of information obtained from using the method. …
-
Lattice Strain Measurements of Deuteride Phase Formation in Epitaxial Niobium on Sapphire
… after repeated cycling. A residual out-of-plane compressive strain was observed in the 1200A Nb film after complete deuterium evolution. This observation can be explained by irreversible interstitial dislocation loop formation.
-
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 …
-
The Electrical and Mechanical Study of the Flexible Organic Light Emitting Diodes
… when the OLED layers were applied with a tensile strain and compressive strain. It is observed that the compressive strain caused less damage than the tensile strain during the bending. It is also observed that a 4 µm thick buffer layer does protect the OLED device in terms of EL brightness while …
-
Mechanisms and Reaction Paths for Surface Roughening and Epitaxial Breakdown During Molecular Beam Epitaxy: Fundamental Limits
Fully-strained Ge1-xSnx layers were grown on Ge(001) to probe the role of incorporated Sn concentrations (C Sn = 1 x 1018 cm-3 to 6.1 at%) on surface roughening pathways leading to EB during LT-MBE (155°C) of compressively strained films. Sn mediates surface morphological evolution through two …
-
Low temperature heterogeneous integration of germanium on silicon
… process flow for Ge on Si epitaxy. Investigating strain in our low-temperature Ge led to a discovery of a residual compressive strain at extended temperature regimes compared to prior work. Based on this residual compressive strain, a model is proposed for misfit dislocation nucleation in Ge-on-Si …
-
Three-dimensional (3D) electronics by compressive buckling process
A compressive force from releasing a pre-stretched elastomer substrate such as PDMS, Ecoflex, and Dragon Skin induces a 2D precursor to realize a sophisticated 3D electronic structure of a resistor, capacitor and transistor. Conventional microfabrication methods create 3D electronic components, and …
-
The effect of Niobium on the defect chemistry and corrosion kinetics of tetragonal ZrO₂ : a density functional theory study
… concentration. The effect of applied external compressive strain on the energetics and stress of different types of defects, and formation energy is quantified as a function of strain. It is observed that the more positively charged the defect, the formation energy increases less as compressive …
-
In-Situ Measurement of Resin Shrinkage for Aerospace Components
… the help of DIC to measure the displacement and strains during the curing process. We utilize this method for a comparative analysis of resin shrinkage in two common aerospace epoxies, Epoxy 105 and EPON 862. An average compressive strain of 0.00896 was observed for Epoxy 105 and 0.01042 for EPON …
-
Microdamage accumulation in bovine trabecular bone
… bone damaged in uniaxial compression and compressive fatigue, and relationships between microdamage parameters and changes in mechanical properties (maximum compressive strain, modulus reduction) were quantified.
-
Comparison of a Dynamic Ankle Orthosis to a Walking Boot for Preserving Ankle Joint Motion and Reducing Tibial Bone Load and Strain
… offloading effects of the DAO on distal tibia strain. The objective of study 1 was to determine the effects of the DAO and walking boot on tibial compressive force and ankle motion during treadmill walking. Twenty healthy young adults walked on a split-belt instrumented treadmill at 1.0 m/s in …
-
The Constitutive Behavior of Thick Thermal Barrier Coatings
… coatings will be subjected to thermomechanical compressive strain cycles that correspond to the on/off cycle of the engine. The focus of this study was to assess the deformation behavior of a plasma-sprayed ZrO-25wt%CeO2-2.5wt%Y2O3 coating material and to determine the critical features that …
-
Computer modelling of the development of the trabecular architecture in the human pelvis
… structure is purported to align to the principal strain trajectories induced during bipedal locomotion. Ontogenetic studies of the juvenile pelvis have observed that trabecular bone growth becomes progressively ordered from an initial randomised patterning. This has lead to theories linking the …
-
A Novel Process for GeSi Thin Film Synthesis
A unique process of fabricating a strained layer GexSi1-x on insulator is demonstrated. Such strained heterostructures are useful in the fabrication of high-mobility transistors. This technique incorporates well-established silicon processing technology e.g., ion implantation and thermal oxidation. …
-
Quantum capacitance in scaled down III-V FETs
… quantum confinement and biaxial compressive strain. This should help to achieve a relatively high electron concentration in future 10 nm high-k dielectric Ill-V MOSFETs. Our study provides a number of suggestions for capacitance scaling in future Ill-V MOSFETs.
-
Nonlinear Lumped-Parameter Model of the Lumbar Intervertebral Disc: A Study on Viscoelastic Deformation and Three-Dimensional Modeling of the Spine
… behavior of the SNS model was simulated by a strain-dependent elastic modulus on the standard linear solid (SLS) model. The SNS model was able to predict the dynamic modulus of the IVD for frequencies of 0.01, 0.1, and 1 Hz. Furthermore, the model was able to quantitatively predict the load …
-
Thermomechanical Modeling of Oxidation Effects in Porous Ultra-High Temperature Ceramics
… tool was used to perform two -dimensional plane strain simulations on unoxidized hexagonal representative volume elements (RVEs) with macroporosity volume fractions of 10%, 40% and 70% to establish a baseline for the response due to geometric effects. Compressive strains of up to 30% were applied …
-
Growth and optimization of quantum dots-in-a-well infrared photodetectors
… 1.2 V and 77 K. In the standard QDIP the average compressive strain in the DWELL is about 1.35% and, therefore, more number of DWELLs cannot be grown without introducing defects or dislocations. Ideally, more number of DWELLs mean more absorption, which translates to increased quantum efficiency …
-
Deformation induced molecular behavior of Cis 1,4-polyisoprene and its nanocomposites monitored by solid-state NMR
… of polyisoprene chains as a function of compressive strain. These are the first experiments to use magic angle spinning nuclear magnetic resonance techniques in situ with compression measurements to identify changes in the chain environment during compressive strain. For the polyisoprene …
-
Poroelastic Finite Element Analysis of a Heterogeneous Articular Cartilage Explant Under Dynamic Compression in ABAQUS
… the tissue response to low amplitude (± 2% strain), low</p> <p>frequency (0.1 Hz) dynamic unconfined compression (UCC). A strong correlation</p> <p>has been made between the relative fluid velocity and stimulation of</p> <p>glycosaminoglycan synthesis. A contour plot of the model shows the …
Page 1 of 4