Materials Literature
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Thrombospondin (TSP) is a trace protein in plasma but is released in high concentrations from alpha-granules of activated platelets during hemostasis. It binds to the platelet membrane and becomes incorporated into fibrin clots. A variety of approaches were taken to learn the effects of TSP on fibrin polymerization an…
Recent reports have claimed that the simple Rapini-Papoular form for the anchoring energy of nematic liquid crystals is not correct for large distortions. We show that, taking into account the dielectric energy associated with the flexoelectric effect, a reanalysis of the data is consistent with the Rapini-Papoular fo…
A simple two‐dimensional packing model, consisting of arrays of circular particles, was used to calculate the free energy changes associated with the filling of pores of different coordinations with liquid. The calculations were used to determine the equilibrium distributions of a liquid in different packing arrangeme…
Abstract not Available.
Recently the Py solvent scale has been introduced and a large body of data has been generated using fluorescence measurements. Numerous problems exist in the correct determination of these values, including instrumental and chemical artifacts. Among the instrumental problems associated with correct Py assignments are…
A model of irradiation embrittlement is described for predicting the 41-J Charpy V-notch temperature shifts (ΔT) as a function of metallurgical variables and neutron exposure conditions. This forecasting procedure combines semi-empirical physical models with statistical analyses of test and power reactor data, and cal…
The time dependence of the complex dielectric constant ε of ferroelectric ceramics is well known as aging which is ascribed by most authors to a modification of the 90°-domain walls. Measurement of aging of Fe-doped PZT ceramic (rhombohedral) and Cr-doped BT ceramic (tetragonal), show that aging in these ceramics can…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActinide thermodynamic predictions. 3. Thermodynamics of compounds and aquo-ions of the 2+, 3+, and 4+ oxidation states and standard electrode potentials at 298.15 KSteven G. Bratsch and J. J. LagowskiCite this: J. Phys. Chem. 1986, 90, 2, 307–312Publication Date (Print):Jan…
Two chemical bleached pulps were treated with a crude enzyme mixture in the presence of HgCI2, (1 mM). Such treatment inhibited endo-cellulases. Xylans were- thus subjected to selective in-situ hydrolysis. The enzyme-treated pulps car. be compared to slightly beaten pulps. The modified fibers show external fibrillatio…
Abstract Experimental measurements have been conducted of Knudsen diffusion through a model porous medium fabricated by the pelleting of monodisperse silica spheres. Tortuosity factors for this random‐assemblage‐of‐spheres porous solid are calculated and compared with values obtained from both theory and measurements…
Pepsin-solubilized bovine corium collagen was purified, reconstituted, and treated with various levels of glutaraldehyde. Treatment of suspensions of fibrillar collagen with low concentrations of glutaraldehyde appeared to have little effect on the gross morphology of fibrils, as judged by electron microscopy, but did…
Saturation effects in transformers and shunt reactors can produce harmonics in power systems. Their magnitude can sometimes be found with an electromagnetic transients program, by going from an approximate linear ac steady-state solution directly into a transient simulation in which the nonlinear effects are included.…
A new analytical function is proposed for absorption correction. It is expressed by surface harmonics with polar angles that specify the primary and secondary beam directions. This function has an advantage over Fourier expansion because it is rotationally invariant. Two empirical, methods are used to determine the ex…
Description Emphasizes toughness as related to damage tolerance of advanced composites. Discusses the problems researchers face in characterizing and analyzing the complex failure mechanisms associated with stress concentration and delaminations. Contains several papers on multi-dimensionally reinforced materials in t…
A Wien Filter electron spectrometer has been successfully combined with a dedicated scanning transmission electron microscope (STEM) to obtain an energy resolution of 140 meV with a specimen collection semiangle of 25 mR at 100 keV. A cold-field emission electron source is used to produce a 0.35–10-nm-size electron be…
We show explicitly that, in a realistic model of diffusion-controlled dendritic solidification, Ivantsov's continuous family of steady-state needle crystals is destroyed by the addition of surface tension. Our starting point is the exact integro-differential equation for the one-sided model, in two dimensions, in a mo…
Abstract Commercial high density polyethylene and polyamide‐6 (PA) resins were melt blended in the Brabender Plasticorder twin‐screw extruder. The blends containing zero to 30 wt percent of polyamide‐6 were examined in dynamic and steady state shear at 150, 200, and 250°C. The Theological test results are discussed in…
Electron-energy-loss spectra of all core-level absorption edges of MgO microcrystals were recorded in the transmission mode using 60-keV electrons. The low-noise signal attained at a resolution of 0.5 eV reveals details of fine structure in the near-edge region. The spectra obtained were analyzed by the application of…
The ability of 21 nonencapsulated and 15 encapsulated coagulase-negative staphylococci (CNS) to adhere to xylene in xylene-water emulsions and to fluorinated poly(ethylenepropylene) (FEP) films revealed remarkable differences. Nonencapsulated CNS strains adhered well to FEP, whereas their adherence to xylene ranged wi…
A new actuator of a joint mechanism is proposed, composed of two TiNi alloy wires. First, the static and dynamic properties of the TiNi alloy wire that were not known are analyzed. Then the mathemati cal model of the actuator is induced. Next, the control sys tems of the actuator are synthesized by pulse width modu la…