Materials Literature
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Most biological fluids are supersaturated with calcium salts. A mechanism controlling crystal growth is therefore necessary to prevent excessive precipitation and development of a lithiasis. In pancreatic juice, calcite precipitation is prevented by lithostathine, a glycoprotein that inhibits calcite crystal growth. W…
Ricki Lewis; Unraveling the weave of spider silk: One of nature's wondrous chemical structures is being dissected so that it can be used in human inventions, Bi
The reflection flat-sample asymmetric geometry is an attractive set-up for powder diffraction measurements, as compared to either conventional Debye–Scherrer or symmetric Bragg–Brentano geometries. Combined with grazing- or fixed-incidence-angle X-rays, it is suitable for surface-structure or thin-film texture analysi…
This paper describes an extension into three dimensions of an existing two-dimensional technique for simulating brittle solid fracture. The fracture occurs on a simulated solid created by "gluing" together space-filling polyhedral elements with compliant interelement joints. Such a material can be shown to have well-d…
Abstract Na2[(Hamp)2Mo5O15]·6H2O (where amp is adenosine-5′-monophosphate) has been crystallized by acidifying a solution containing Na2MoO4·2H2O and adenosine-5′-monophosphoric acid (AMP = H2amp) to pH 3—4. A single-crystal X-ray structural analysis of a colorless crystal of Na2[(Hamp)2Mo5O15]·6H2O [space group P3121…
Abstract To study runaway behavior in autoclave low‐density polyethylene (LDPE) reactors, a kinetic model for a perfectly stirred tank reactor is presented. The kinetic model not only includes the standard initiation, propagation, and termination reactions for polymerization, but it also has free radical reactions tha…
A rapid fixation/dehydration method of plant specimens for scanning electron microscopy is presented. Prior to critical‐point drying (CPD) the specimens are immersed in pure methanol. Methanol incubation instantly fixes the elastically extended cell walls. Owing to this instant fixation, shrinking of the specimens is…
Other| October 01, 1996 Synthesis, characterization, and energetics of solid solution along the dolomite-ankerite join, and implications for the stability of ordered CaFe(CO 3 ) 2 L. Chai; L. Chai Princeton University, Department of Geological and Geophysical Sciences, Princeton, NJ, United States Search for other wor…
The electrical performance of outdoor insulation degrades severely during combinations of factors that include surface contamination (C), ice (I), fog (F) and an ambient temperature that rises through 0 C (T{sub 0{degree}}). Failures at operating voltage on 115-kV, 230-kV and 500-kV systems occur with increasing proba…
The antiferroelectric (AFE)-ferroelectric (FE) phase transformation under dc bias and hydrostatic pressure conditions in tin-modified lead zirconate titanate ceramics [Pb(Zr,Sn,Ti)O3, i.e., PZST] was investigated. The shifting of transformation temperature under these conditions and an electric field induced lattice s…
Atomic force microscope examinations of the free surface and of microtome cuts of a cholesteric oligomer are reported. The obtained images lead to a model of the structure of cholesteric focal conic domains that appear spontaneously at the free surface. These domains develop in order to fulfill the boundary condition…
Abstract The influence of lactide configuration on the chain microstructure of lactide/ε‐caprolactone copolymer was investigated. The copolymerization was carried out in the presence of Al(acac) 3 , AlEt 3 and ZnEt 2 as initiators. The chain microstructure analysis of the copolymers was performed by means of 13 C NMR…
A modified electrochemical noise (EN) technique (electrochemical emission spectroscopy [EES]) was developed for nondestructive, real-time corrosion rate measurements. Unlike conventional corrosion-rate measuring techniques that use external signals, this technique uses signals generated by the corroding system. It can…
Carbon single-wall nanotubes (SWNTs) are essentially elongated pores of molecular dimensions and are capable of adsorbing hydrogen at relatively high temperatures and low pressures. This behavior is unique to these materials and indicates that SWNTs are the ideal building block for constructing safe, efficient, and hi…
Abstract Since the first reports on the combination of liquid crystalline polymers in block (1985) and graft (1986) copolymers with amorphous and semi‐crystalline polymers, the scientific interest has been focused on understanding how the size and type of the mesophase displayed by the liquid crystalline part(s) affec…
In a multidimensional domain, the slow motion behavior of internal layer solutions with spherical interfaces, referred to as bubble solutions, is analyzed for the nonlocal Allen–Cahn equation with mass conservation. This problem represents the simplest model for the phase separation of a binary mixture in the presence…
We have confirmed the theory of Ishibashi and Orihara for the frequency dependence of coercive fields in ferroelectric thin films.SrBi2NbTaO9, SrBi2Ta2O9, and PbZr1-x Ti x O3 (PZT) data from DeVilbis et al. reveal a power-law dependence of form Ec (f) = Bfd/α , where d is the dimensionality of domains (ca. unity in un…
A numerical investigation is presented of axisymmetric, static and elongating, viscous Newtonian liquid bridges confined between identical circular disks. The time-dependent interface shapes and applied forces on the end plates, which separate at a constant prescribed velocity, are calculated as functions of the capil…
Abstract In the 12 km 2 catchment area of Syv creek, Denmark, moderate to high concentrations of nitrate (NO 3 − ) occurred in the upper part of the oxidized zone (oxic-I), but dropped within the lower suboxic part (oxic-II), to below the detection limit in the unoxidized zone. Structural Fe 2+ in the clay minerals ma…
A variant of the powerful thin-film needle design technique, which was first described by Tikhonravov and his co-workers, is described. In this method thin layers are introduced at optimum positions within the refractive-index profile of a given multilayer system. In the original method the optimum locations for the l…