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 41 for “"surface stress"”.
-
A theoretical analysis of the surface stress in mountainous regions
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1963.
-
Effect of Surface Stress on Micromechanical Cantilevers for Sensing Applications
Three models for surface stress loading effect on a micromechanical cantilever are proposed as concentrated moment acting at the free end (Model I), concentrated moment plus axial force acting at the free end (Model II), and uniformly distributed surface force acting along the microcantilever …
-
In situ investigation of electrochemical surface stress development in rechargeable batteries
… vs. lithium and sodium. There are two types of stress evolutions arising from lithiation/sodiation and delithiation/desodiation. Accommodating metal ion process makes compressive stress whereas stripping metal ion process makes tensile stress. These two types of stress evolution was measured by …
-
Changes in the near-surface stress in titanium caused by krypton ion-implantation
In this work, the effect of krypton implantation on the morphology of titanium samples is investigated through scanning electron microscopy (SEM). Rutherford backscattering spectrometry (RBS) was also used to determine the dose and depth of implanted krypton. The krypton profiile in titanium, and …
-
Investigation of electrochemical interfaces at the molecular level
… and electroplating are examined with in situ surface measurement techniques and density functional theory calculations. Experimental and computational studies presented herein will provide a fundamental understanding of the electrochemical systems examined and guide the field toward practical …
-
Nanoscale thermal transport for biological and physical applications
… through it. In this thesis, the effects of surface stress on the lattice thermal conductivity are presented for a silicon nanowire. Based on a continuum approach, a phonon dispersion relation is derived for a nanowire that is under surface stress and the phonon relaxation time is employed to …
-
MicroCantilever (MC) based nanomechanical sensor for detection of molecular interactions
… study are to investigate the mechanism governing surface stress generation associated with chemical or molecular binding on functionalized microcantilevers. Formation of affinity complexes on cantilever surfaces leads to charge redistribution, configurational change and steric hindrance between …
-
The impact of wave-modified wind stress in an ocean circulation model
… is the growing and dissipation of the surface wave field. Two numerical experiments are conducted for the South Atlantic: one with the new wave effect included and a control run (without any wave information) used as a reference for comparison. The forcing fields (including the …
-
The Design and analysis of a HA/PLA pedicle screw for spinal fusion
… estimate an optimum design which had the lowest surface stress in the screw. The obtained design was used for experimental testing to verify computational results and analyze practicality of clinical use. The optimal screw was shown to have a maximum surface stress of 81.83 MPa. The reaction in …
-
The stress and strain behavior of materials for energy storage and production
… materials, specifically silicon and tin, and the surface stress changes of platinum, palladium, and rhodium catalysts for the oxygen reduction reaction of fuel cells. In the first section, silicon microstructuring is utilized in order to design structures that can withstand the large volumetric …
-
COMPUTATIONS ON STATIC AND DYNAMIC MODELS OF SOLID SURFACES
Solid surfaces have been investigated by the lattice statics and molecular dynamics methods. Body centred and face centred cubic crystals at O K were studied by lattice statics- Bulk lattice spacings and potential energies were calculated and found to agree with the values obtained by other …
-
Ion implantation for figure correction of high-resolution x-ray telescope mirrors
… while achieving and maintaining the required surface figure accuracy. Ion implantation offers a potential solution for fabricating high-accuracy mirrors, by providing capability for fine figure correction of mirror substrates. Ion implantation causes local sub-surface stress that is a function …
-
A Novel Shape Memory Behavior of Single-crystalline Metal Nanowires
… lattice reorientation driven by the high surface-stress-induced internal stresses at the nanoscale. It exists over a wide range of temperature and is associated with response times on the order of nanoseconds, making the nanowires attractive functional components for a new generation of …
-
MICROMANIPULATOR-RESONATOR SYSTEM FOR SELECTIVE WEIGHING OF INDIVIDUAL MICROPARTICLES
… rely on attachment of target entities on their surface. The attachment causes either change in surface stress or resonance frequency of the cantilever, which is detected using various schemes that range from optical to piezoelectric. The majority of these sensors rely on probabilistic attachment …
-
On the Shape of the Free Surface of a Rubber-Like Material in Proximity to a Rigid Contactor
… pioneering work on the wrinkling of a free surface with residual stress and investigate the wrinkling of residually stressed solid films subjected to van der Waals or other types of interaction from a proximate contactor. We consider an incompressible rubber-like film of infinite depth, …
-
How much DNA is too much?
… determinants alleviating and exacerbating cell surface stress increase and decrease the limit to viable ploidy, respectively. I also identify gene expression changes characteristic of whole genome duplication, immediately as it occurs. In part because recapitulating physiologic effects implied …
-
Interrogating electrocatalytic mechanisms and developing nano-porous catalysts for energy conversion reactions: I. Oxygen evolution reaction, and II. Carbon dioxide reduction reaction
… basic electrolytes using in situ electrochemical surface stress measurements. Second, I developed a new electrolyte additive-controlled electrodeposition method for the preparation of porous films of Ni and NiFe catalysts with high OER activity. Third, I exploited the additive-controlled …
-
Fracture in polycrystalline diamond. Investigating cracking and toughness behaviour using a miniature double torsion technique
… by digital image correlation (DIC), a full field surface displacement measurement technique. The DIC experiments were performed in both 2D and 3D configurations. The DIC data was processed employing the JMAN routine – a numerical method for the calculation of the J-integral from the DIC measured …
-
Stress evolution during growth and atomic-scale surface structure effects in transition-metal thin films
… to the thickness, resulting in very high surface-to-volume ratios. For this reason, the surface characteristics of a film play an important role in the properties of the film as a whole. This research focused on the connections between the properties and the surface state of metallic thin …
Page 1 of 3