Tetrasolventoberyllium(II): high-pressure evidence for a sterically controlled solvent-exchange mechanism crossover
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Disaccharide conformational flexibility. I. An adiabatic potential energy map for sucrose
Constrained conformational energy minimizations have been used to calculate an adiabatic (phi, psi) potential energy surface for the disaccharide sucrose. The inclusion of molecular flexibility in the conformational energy analysis of this disaccharide was found to have a significant effect upon the allowed conformati…
High‐temperature migration of antioxidants from polyolefins
Migration rates of radiolabelled antioxidants, Irganox-1010 (I-1010) and Irganox-1076 (I-1076), were measured from low- and high-density polyethylenes (LDPE, HDPE) and polypropylene (PP) at temperatures up to 135 degrees C. Water, 8 and 95 per cent aqueous ethanol and corn oil were employed as food simulating liquids…
Effect of Structure of Photoresponsive Molecules on Photochemical Phase Transition of Liquid Crystals I. Synthesis and Thermotropic Properties of Photochromic Azobenzene Derivatives
Seventeen azobenzene derivatives were synthesized and their thermotropic properties were examined. They are classified into three groups. In the first group, 4-cyanobiphenyl moieties are attached t...
Intermediate layers for the deposition of polycrystalline diamond films
Thin films of BN, hard carbon, a-C:H, and SiC have been deposited onto ZnS or (100)-silicon as precursors to the growth of polycrystalline diamond films. These layers must protect the substrate from chemical attack at the deposition temperatures used in microwave plasma chemical vapor deposition (CVD) and also promote…
A study of modified polyimide surfaces as related to adhesion
Surfaces of fully imidized pyromellitic, dianhydride–oxydianiline (PMDA-ODA) based polyimide films have been studied after argon ion-beam bombardment or treatment with either oxygen or nitrogen plasmas. The treated surfaces were characterized by x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM…
Picosecond relaxation of strongly coupled porphyrin dimers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPicosecond relaxation of strongly coupled porphyrin dimersOsman. Bilsel, Juan. Rodriguez, and Dewey. HoltenCite this: J. Phys. Chem. 1990, 94, 9, 3508–3512Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May 1990https://pu…
Vacuum ultraviolet radiation/atomic oxygen synergism in materials reactivity
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Relationship between ThMn12 and Th2Ni17 structure types in the YFe11−xTix alloy series
A series of YFe11−xTix alloys with x=0.10, 0.25, 0.40, 0.50, 0.70, 1.00, 1.25, 1.50, and 2.00 have been investigated using x-ray diffraction, thermomagnetic analysis, the singular point detection technique, and 57Fe Mössbauer spectroscopy. A pure ThMn12 -type phase was observed when 0.7≤x≤1.25. It has Curie temperatur…
Creep Behavior of a SiC‐Whisker‐Reinforced Alumina
Creep tests in four‐point flexure loading configuration in air employing applied stresses of 37 to 300 MPa at temperatures of 1200°, 1300°, and 1400°C were performed on 20‐vol%‐SiC‐whisker‐reinforced alumina and unreinforced single‐phase polycrystalline alumina. The creep rate of polycrystalline alumina was significan…
Ordering Behavior of Lead Magnesium Niobate Ceramics with A‐Site Substitution
The ordering behavior of lanthanum‐modified lead magnesium niobate ceramics was investigated over a wide range of lanthanum content (from 0 to 50 at.%). The ordering of magnesium and niobium ions in the B site was examined by X‐ray diffraction, and the superlattice reflection was associated with the A(B′ 1/2 B″ 1/2 )O…
Theory of homopolymer-block copolymer blends. The search for a universal compatibilizer
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of homopolymer-block copolymer blends. The search for a universal compatibilizerT. A. Vilgis and J. NoolandiCite this: Macromolecules 1990, 23, 11, 2941–2947Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May 1990h…
Morphology of plastic/rubber blends
Abstract Blends of polypropylene (PP) and ethylene‐propylene rubber (EPR) and blends of polystyrene (PS) and styrene‐butadiene rubber (SBR) were prepared in a laboratory‐scale internal mixer at various blend compositions and rotor rates. Blend morphology was studied by means of electron microscopy. For each blend pair…
Formalism for quantitative surface analysis by electron spectroscopy
A new, simple formalism for quantitative surface analysis by electron spectroscopy is found. The formalism takes into account the in-depth concentration profile and consists in three algorithms. The simplest of the algorithms is reasonably accurate for spectra from most in-depth profiles. For narrow depth profiles cen…
Acid shock proteins of Escherichia coli
Synthesis of total cellular proteins of Escherichia coli was studied after transfer of cultures from pH 6.9 to pH 4.3. Proteins induced by such an external pH shift down were identified by mono- and bi-dimensional electrophoresis. 30 to 45 min after an acid shift, a group of at least sixteen polypeptides was markedly…
Mechanisms of quadratic electro-optic modulation of dye-doped polymer systems
We present the experimental and theoretical considerations needed to determine the mechanisms of quadratic electro-optic modulation in dye-doped polymer systems. The modulation is observed in thin dye-doped polymer films and the quadratic Kerr coefficient is determined by using a modified Mach–Zehnder interferometric…
The use of Sayre's equation with solvent flattening and histogram matching for phase extension and refinement of protein structures
A new method for phase refinement and extension, which combines Sayre's equation with solvent flattening and histogram matching, has been developed. Equations which express electron-density constraints are solved using discrete Fourier transforms to give a new approximation to the electron density. The formulation of…
The first ambient pressure organic superconductor containing oxygen in the donor molecule, .beta.m-(BEDO-TTF)3Cu2(NCS)3, Tc = 1.06 K
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe first ambient pressure organic superconductor containing oxygen in the donor molecule, .beta.m-(BEDO-TTF)3Cu2(NCS)3, Tc = 1.06 KMark A. Beno, Hau H. Wang, Aravinda M. Kini, K. Douglas Carlson, Urs Geiser, W. K. Kwok, James E. Thompson, Jack M. Williams, Jingqing Ren, and…
Morphology and mechanical properties of thermoplastic composites containing a thermotropic liquid crystalline polymer
Abstract Blends of two thermotropic liquid crystalline polymers (TLCPs), with brittle and ductile matrix materials were both injection molded and spun into fibers, in order to investigate the mechanism of in ‐ situ mechanical reinforcement. In the injection molded samples, the TLCP was only moderately elongated into f…
Magnetic properties of FeAlMnC steels
A series of high yielding strength (90–180 ksi) and high-elongation (30%–45%) FeAlMnC steels have been made. The magnetic, microstructural, and thermal expansion properties of these steels have been studied. Basically, their magnetic transitions on cooling can be classified into three groups according to their microst…