Materials Literature
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Becker and Mott have provided different formulae for the thermal activation energy of a process that occurs under stress. As the applied stress tends towards the critical stress, Becker's formula requires the smaller activation energy. We argue that, while the Mott formula represents the energy required for the system…
The first polarized low-temperature absorption and luminescence spectra of manganese-doped crystals of BaSO(4) containing essentially MnO(4)(2)(-) are reported. By using a flux composed of NaCl, KCl, and CsCl we were able to grow BaSO(4):Mn(6+) crystals below 620 degrees C. This prevents the simultaneous presence of M…
The values for Young's modulus of porous single-crystal Ni in the [100] and [111] directions are computed using the embedded-atom method (EAM). Both pore volume fraction and pore size (defined by ratio S/R of the flaw size to pore radius) are varied. A reduction in Young's modulus with increasing pore volume fraction…
Abstract A high molecular weight, linear aromatic poly(ether ketone ether ketone ketone) (PEKEKK) has been synthesized by electrophilic Friedel‐Crafts acylation condensation of 1,4‐diphenoxybenzophenone with terephthaloyl chloride. The syntheses were performed as precipitation polycondensations, and the polyketones we…
Director fluctuations in nematic liquid crystals are readily analyzed in terms of the normal modes of the director field. In this paper, we examine the dynamics of fluctuations in the radial director field of a spherical nematic droplet in terms of its normal modes. We find independent twist-bend and splay-bend modes…
A magnetic field sensor based on the dependence of the magnetostrictive delay line (MDL) response on its biasing magnetic field is presented in this paper. Such a sensor can be formed in an integrated array measuring the distribution of field along the MDL axis. Experimental results are reported for amorphous FeSiB wi…
A bisphthalonitrile monomer containing bismaleimide groups was synthesized using 4,4′-bismaleimidodiphenylmethane and 4-aminophenoxyphthalonitrile. The structure of the monomer was confirmed by elemental analysis and IR spectroscopy. With this monomer, a phthalocyanine resin containing bismaleimide groups was obtained…
Photocorrosion of n-GaAs and passivation by Na 2 S have been studied in a working photoelectrochemical cell as a function of crystal face orientation. Time-resolved photoluminescence studies of the (100), (110), and (111)B faces of n-GaAs show that Na 2 S provides a similar degree of corrosion protection to the (100)…
Various high-density DRAM and FRAM technologies currently under investigation utilize high-dielectric constant materials requiring noble metal or refractory metal oxide electrodes. In this paper we describe a study of platinum patterning by reactive ion etching (RIE). Platinum films were etched in a rf diode parallel…
Other| April 01, 1997 Natural kalsilite, KAlSiO2, and P31c symmetry; crystal structure and twinning Daniela Cellai; Daniela Cellai Dipartimento di Scienze della Terra, Florence, Italy Search for other works by this author on: GSW Google Scholar Paola Bonazzi; Paola Bonazzi Search for other works by this author on: GSW…
This paper describes the electrochemical characterization of electrode-confined siloxane polymers that contain both naphthoquinone (NQ) and benzylviologen (BV 2+ ) subunits. These “homopolymers,” abbreviated (NQ-BV 3+ ) n and (NQ-BV-BV 5+ ) n, are derived from monomers, 2-chloro-3-[[2-{dimethyl[[[[ N ‘-[[4-(trimethoxy…
Diaminopimelate (DAP) is used by bacteria for the synthesis of lysine. In many species of bacteria, including mycobacteria, DAP is also used for peptidoglycan biosynthesis. In this report we describe the cloning of the dapB gene encoding dihydrodipicolinate reductase (DHPR), which catalyzes a key branch point reaction…
A density functional investigation of methyltrioxo−rhenium and its lower homologue methyltrioxo−technetium studying the influence of relativistic effects on the reactivity of the two metal centers is presented. In order to quantify the Lewis acidity of the central metal atom, the adduct formation with NH 3 as a probe…
The effects of several oxoacid salts (sulfate, molybdate, phosphate, and nitrate) on pitting behavior of type 304 (UNS S30400) stainless steel (SS) were examined to characterize their performance in high-temperature chloride solutions through measurement of pitting temperatures (Tp) and potentials (Ep). Measurement of…
This paper presents a control law for shape memory alloy (SMA) wire actuators. Unlike most laws reported in the literature, this control law includes both a feedback and an open-loop part. The open-loop part takes into account the stress - strain - temperature behaviour of SMA wires, as well as the dynamics of the hea…
β-Sitosterol, β-amyrin, 4-hydroxyacetophenone, 3,4-dihydroxyacetophenone, sitosteryl 3- O -β- d -glucopyranoside, cynandione A, and cynanonesides A ( 3 ) and B ( 4 ) were isolated from the roots of Cynanchum taiwanianum . The latter two compounds are new acetophenone glucosides, and their structures were elucidated on…
Systematic parameter studies were implemented to investigate the basic characteristics [plutonium and minor actinide (MA)-burning rate, burnup reactivity loss, Doppler coefficient, sodium void reactivity, maximum linear heat rate, etc.] of plutonium and MA-burning fast reactors and also to clarify the feasibility of s…
We present a new theoretical framework for a statistical mechanical and thermodynamic description of any general inhomogeneous system (not necessarily polymeric) in the presence of surfaces. The framework is an extension of a lattice theory recently developed for a homogeneous system and requires approximating the ori…
The corrosion behavior of ceria/titania coated 304 stainless steel (304 SS) was studied by anodic polarization measurements in 0.05 N NaCl. Coatings were prepared by sol‐gel methods, were approximately 0.5 μm thick and bonded well to the substrate. The as‐received stainless steel suffers sensitization at the coating c…
Temperature-induced variations of light refraction and dielectric permittivity in single-crystal Sr1−x BaxTiO3 (x=0.02, 0.05, 0.07, and 0.14), Sr1−x CaxTiO3 (x=0.014), and in nominally pure strontium titanate have been studied within the 17–300 K temperature range. The spontaneous polar contribution to the refractive…