Materials Literature
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In order to be able to reduce the leakage of contaminant out of a fume cupboard it is first necessary to investigate the detailed fluid flow patterns inside and around the fume cupboard. Because of the difficulties and expense of performing these experiments, in this paper a computational fluid dynamics approach has b…
Abstract The practical application of high impact polystyrene (HIPS) depends on the resistance to aging in aggressive environments. The investigation of morphological, mechanical, and chemical properties was made on HIPS samples of various thickness. The property deterioration of HIPS caused by concentrated nitric aci…
The electrical failure of multilayer ceramic capacitors (MLC's) subjected to environmental screening testing (EST) environments is systematically studied in this work. Based on results obtained from comparative EST environments, it is shown that a thin water film can appear on the MLC surface as a result of water vapo…
Abstract We have studied mechanical and rheological behavior of poly(vinyl acetate) (PVAC) composites filled with calcite as a function of filler particle geometry, particle size distribution, and active surface area. Detailed morphological characteristic were investigated. Tensile properties of PVAC composites were e…
Concentrations of population and business activities result in high electricity demand in urban areas. This requires the construction of large-capacity underground substations. Oilless, nonflammable and nonexplosive equipment is recommended for underground substations. Therefore, several types of large-capacity gas-in…
We have carried out x-ray diffraction studies on the modulated phases of ${[\mathrm{N}{(\mathrm{C}{\mathrm{H}}_{3})}_{4}]}_{2}$Zn${\mathrm{Cl}}_{4}$ and ${[\mathrm{N}{(\mathrm{C}{\mathrm{H}}_{3})}_{4}]}_{2}$Fe${\mathrm{Cl}}_{4}$ under hydrostatic pressure. The geometrical similarities among the pressure-temperature ph…
Advanced sewing machines should be able to set up automatically, detect sewing faults, and self-adjust to required settings. In order to achieve this objective, a sewing machine has been instrumented with sensors, so that wave forms of needle penetration and withdrawal forces, presser-foot compression force, and sewin…
The behavior and some physical and thermal properties of a 30Li 2 O‐70SiO 2 base glass composition with addition of ZrSiO 4 in the as‐quenched state was investigated with the aid of X‐ray diffraction (XRD), differential thermal analysis (DTA), thermal expansion and microhardness measurements, as well as density measur…
During heat treatment of an industrially produced Al high-Mn alloy, small particles of the quasicrystalline icosahedral AlMnSi phase were precipitated, with a definite orientation relation to the Al matrix. Upon further annealing, the particles coarsen and transform, through intermediate stages into the cubic α-AlMnSi…
We have investigated the crystallinity of (BTO) thin films on (100)MgO and (100)STO substrates and the (YBCO) buffer on MgO. An ArF excimer laser with a fluence 1.4 to 3.6 per pulse was used of the preparation of BTO films at substrate temperatures in 500 to and oxygen pressures of to Torr. BTO thin films with (001) o…
The chemical and p ysical structures of archaeological mineralized plant fibers are studied using energy x-ray dispersive spectroscopy (EDS), scanning electron microscopy (SEM), and FTIR microspectrometry, and compared with two contemporary bast fibers. The outer surfaces of the fibers and the inner surfaces of the lu…
Other| April 01, 1996 Monoclinic-orthorhombic phase transition in the K 2 MgSi 5 O 12 leucite analog Simon A. T. Redfern; Simon A. T. Redfern University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom Search for other works by this author on: GSW Google Scholar C. Michael B. Henderson C. Michael…
A class of temperature-sensitive (ts) mutants of T4 lysozyme with reduced activity at 30 degrees C and no activity at 43 degrees C has been selected. These mutants, designated "tight" ts mutants, differ from most other T4 lysozyme mutants that are active at 43 degrees C, but only manifest their ts lesion by a reduced…
We report x-ray photoemission spectra of polystyrene (PS). XPS spectra were measured with the SSI, SSX-100 model, using monochromated Al Kα x-rays. We present the survey spectrum (binding energy range of 0–1100 eV) and a narrow spectrum of C 1s. The polymer is used as a reference to study the influence of PS surface m…
The flammability of a filled ethylene-propylene copolymer is discussed. A mineral filler with 40% of hydromagnesite and 60% of huntite by weight is used as a flame retardant additive. Some burning characteristics and mechanical properties have been studied in relation to the amount of incorporation. Flammability was m…
Abstract A theoretical study of the thermodynamic properties in the Einstein‐Debye approximation is made for solids with polyatomic basis. Analytical expressions are derived for the equation of state, isobaric specific heat ( C p ), and linear thermal expansion coefficient (α P ). The temperature dependences of C p an…
The thermal expansion coefficients along the a axis (αa) and c axis (αc) of barium hexaferrite were measured from room temperature to 850 °C. The thermal expansion of barium hexaferrite along the a axis and c axis was found to be linear as a function of temperature, indicating constant thermal expansion coefficients o…
Multiline upconversion luminescence ranging from 375 to 635 nm was studied in Yb:Tb:YSGG crystal, a possible candidate for a tunable upconversion laser material. This luminescence was attributed to the transitions starting from the 5D3 and 5D4 excited levels of Tb. Two sequential steps in the upconversion were determi…
I describe new phases of a chiral liquid crystal with nematic and hexatic order. I find a conical phase, similar to that of a cholesteric in an applied magnetic field for Frank elastic constants $K_2>K_3$. I discuss the role of fluctuations in the context of this phase and the possibility of satisfying the inequality…
The effect of externally added molybdate (MoO42–) on the repassivation and SCC behavior of type 304 (UNS S30400) stainless steel (SS) was investigated in 1 M hydrochloric acid (HCl) at open-circuit potential (OCP). With the addition of MoO42–, the time to failure initially decreased but then gradually increased. From…