Materials Literature
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With increasingly diversified demands on the mechanical properties of polymeric fibers, the question of whether properties can be varied independently or are related has become imperative. This report is concerned with the relation between tensile modulus and stress relaxation. The modulus-elongation curve of various…
Surface-Enhanced Raman Scattering (SERS) on HNO 3 -roughened copper foils has been used to follow the air oxidation of copper at room temperature and to study the surface reactions with azole compounds. It has been found that azoles react with metallic copper as well as copper oxides. SERS and IR studies show that the…
We developed models for the dynamic expansion of cylindrical cavities from zero initial radii for compressible, elastic-plastic, rate-independent materials with powerlaw strain-hardening. Results from cavity-expansion models were used to derive perforation models to predict residual velocities and ballistic limits for…
The electrochemical potentiodynamic reactivation (EPR) technique has been used to measure the degree of sensitization in type 304 (UNS(1) S30400) stainless steel with 0.052% C. In the first part of the work, the dependence of EPR results on testing temperature is quantified, thus permitting the conversion of field tes…
The effective nonlinearity parameter B/A of water containing a three-dimensional ensemble of randomly distributed uniform-sized trapped cylindrical bubbles was measured. The experimental results indicate that the dramatic enhancement of the effective nonlinear parameter B/A is due to the nonlinear resonance oscillatio…
Abstract Discrepancies between clay mineral and organic indicators of very low-grade metamorphism have been observed from the Southern Uplands of Scotland. In the Southern Belt, I-S expandability ranges from 18–5% and chitinozoan reflectance from 0·8–2·1% R 0 mean; a clear correlation exists between I-S expandability…
We examine how dopant profile and anodization conditions affect the formation of buried porous silicon layers in n − /n + /n − doped wafers. Wafers with peak n + donor concentration ≤10 18 /cm 3 exhibit stray dendritic pores propagating from the n + layer into the n − layers. Depending on the anodization conditions th…
Highly irradiated fuel rods and control rods are used in the Power Burst Facility Severe Fuel Damage (SFD) Test 1-4 to simulate conditions expected during a high-temperature, severe fuel damage accident in a pressurized water reactor. The objective of the test is to provide data on fuel and control rod behavior, hydro…
Injuries to ligaments in the knee are common in sports and other physical activities. Some clinical methods are available for qualitatively evaluating the degree of ligament injury and healing. It is, however, desirable to objectively assess the healing of ligaments and to predicate optimal treatment on quantitative m…
Pyroelectric properties of a bismuth layer-structured ferroelectric (BLSF) family are studied on ordinarily fired (OF) (nonoriented) and grain-oriented ceramics for pyrosensor materials. The pyroelectric figure of merit, Fv and FD , are evaluated from the measured values of the pyroelectric coefficient, p, the dielect…
Ferroelastic phase transitions and phase transitions involving coupling between the driving order parameter and elastic degrees of freedom (i.e. co-elastic phase transitions) follow empirically a Landau-type mean field behaviour over large temperature intervals. At temperatures close to the transition point the upper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of poly(ethylene oxide) crystallization from solution: temperature and molecular weight dependenceNi Ding and Eric J. AmisCite this: Macromolecules 1991, 24, 13, 3906–3914Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Published in…
Small-angle neutron scattering has been performed on lysozyme solutions at different concentrations, both at the Intense Spallation Impulsed Source (ISIS), Rutherford-Appleton Laboratory) and at Orph\'ee (Laboratoire Leon Brillouin). The results show that, in addition to the large-scale structural properties revealed…
Reflection electron microscopy (REM) has been applied to image the surface structures of polished natural diamond (001) faces before and after frictional sliding. Friction tracks produced by a diamond stylus sliding at a nominal contact pressure of a few GPa can be clearly seen in REM images of the surface. The contac…
Abstract De-intercalation of DMSO from well-crystallised kaolinites induced disorder. SEM, XRD and low-temperature IR were used to probe changes in morphology, layer stacking, and the environment of OH groups, respectively. The degree and type of disorder depended on the starting material and on the method of removing…
We have studied the optical properties of GaAs partially amorphized by As+-ion implantation. The model used is based on the two-phase mixture Bruggeman effective-medium approximation in which the partially amorphized layer is assumed as a physical mixture of fully amorphous GaAs and crystalline GaAs. The dielectric fu…
Abstract Surface‐enhanced Raman scattering (SERS) of α‐toluenethiol adsorbed on a silver surface has been investigated. The controversial vibrational assignment of the molecule was refined by comparing the SERS spectra with the ordinary Raman spectra of α‐toluenethiol, α‐toluenethiolate, benzyl chloride and their deut…
Abstract The crystal orientation of solid‐state biaxially drawn solution‐crystallized ultra‐high‐molecular weight polyethylene (UHMW‐PE) film has been revealed from flat‐plate wide‐angle x‐ray scattering (WAXS) patterns and interpreted in terms of crystal plasticity. A slightly drawn film (λ ≤ 3 × 3) possesses only a…
The Cahn-Hilliard theory of phase separation by spinodal decomposition has been extended to include hydrodynamics caused by surface tension. Numerical solutions for phase separation in binary polymer mixtures in two spatial dimension are presented. The surface tension influences the growth rate of the average domain s…
Pipe diffusion along a dissociated edge dislocation in copper is investigated by molecular dynamics simulation. The formation energies of a vacancy and an interstitial in the cores and the fault ribbon are calculated by quasi-dynamics relaxation at 0 K. The diffusion rates of these defects are calculated at high tempe…