Materials Literature
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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…
Dynamic FT-IR spectra in the amide I region were measured for silk fibroin cast films. Phase analyses of the dynamic spectra were carried out in order to separate them into several components which are due to the secondary structures of fibroin. These observations showed that peak positions of the amide I bands were i…
Five active site residues, Thr11, Glu12, Lys15, Lys37, and Ser41, implicated by the protein crystal structure studies of Escherichia coli DTBS, were mutated to determine their function in catalysis and substrate binding. Nine mutant enzymes, T11V, E12A, E12D, K15Q, K37L, K37Q, K37R, S41A, and S41C, were overproduced i…
By combining vibrational spectra and ab initio calculations, we obtained a consistent description of the IR and nonresonant Raman spectra, including intensities, of four thiophene based polymers—undoped and heavily doped poly(thiophene) (PTh), undoped poly(thieno[3,4-b]benzene) (PITN), and poly(thieno[3,4-b]pyrazine)…
Density functional calculations are used to investigate the non-ferroelectric end-points of the KTN and PZT alloy systems and to address the errors in the local approximation for KNbO3. In PbZrO3, substantial hybridization is found between O 2p and Zr 4d states and between O 2p and Pb s and p states. A strong Γ point…
The reduction of rhodium(III) porphyrins in polar aprotic solvents is a two-electron irreversible reaction yielding directly the Rh(I) complex. The cause of this irreversibility is not the metal−metal dimerization of the initially formed Rh(II) complex as believed earlier but rather deligation which generates a second…
The compound ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Sr}}_{\mathrm{x}}$${\mathrm{MnO}}_{3}$ undergoes structural and magnetic phase transitions as a function of temperature and pressure. The temperature at which the structural phase transition from a high-temperature rhombohedral phase to a low-t…