Materials Literature
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The crystal structure of the complex between ribonuclease A and d(ApTpApApG) has been solved by xray crystallography using the molecular replacement method. The model includes, besides the enzyme, the d(ApTpApA) 5'-segment (A'T2ASA4) and 68 solvent molecules. The R-factor for the strongest 87p of the measured data tha…
We propose a new model for the brittle-to-ductile transition based on the Kosterlitz-Thouless concept of dislocation screening. In this model, thermal fluctuations assisted by the applied stress drive the spontaneous generation of dislocations and the instability occurs well below the melting temperature. In the limit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRheological and Microstructural Transitions in Colloidal CrystalsL. B. Chen, M. K. Chow, B. J. Ackerson, and C. F. ZukoskiCite this: Langmuir 1994, 10, 8, 2817–2829Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August…
For the burning of plutonium derived from nuclear warheads, once-through type oxide fuels have been studied by considering their proliferation resistance and environmental safety as well as their technological backgrounds of fuel fabrication and reactors.From phase relations of ceramic materials and their chemical pro…
We present a continuum theory of frustration-limited clusters in one-component glass-forming liquids that accounts, in part, for the recently reported [Fischer et al., J. Non-Cryst. Solids, 131–133, 134 (1991)], and quite unexpected, presence in simple glass-forming liquids of stable clusters at low temperatures (T) a…
It is shown that strongly reducing the range of the attractions of a simple fluid will transform its phase diagram from the usual type, with a fluid-fluid critical point and a fluid-fluid-solid triple point, into its fluid-solid mirror image, with a solid-solid critical point and a solid-solid-fluid triple point. This…
A general purpose multiline, mean‐normalized‐intensity (MNI) method, derived from a procedure proposed in the literature, was applied to puase‐composition analysis of powders containing α‐ and β‐silicon nitride and small amounts of free silicon. Results obtained using peak and integrated intensities to derive the MNI…
Abstract A high-pressure modification of tungsten dioxide (hp-WO 2 ) was synthesized at 80 kbar and 1120 K. The structure was determined from X-ray powder diffraction data: hp-WO2, M = 215.85, space group Pnma, a = 9.7164(3) Å, b = 8.4380(3) Å, c = 4.7564(2) Å, Z = 12, D x = 11.03 g cm −3 , R wp = 0.12 and R B = 0.078…
The synthesis and characterization of a highly processable thermosetting polyimide system based on 22'-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride or bisphenol A dianhydride (BPA-DA) endcapped with 4-phenylethynylphthalic anhydride is described. The system afforded oligomers that were readily melt processab…
X-ray crystallography has allowed to identify new solid solutions with the formulae LiPb1–xMxPO4, NaBa1–yM′yPO4 and NaPb1–zSrzPO4. When M = Sr, Ba, × varies between 0.0 and 0.4 in the vicinity of LiPbPO4 and between 0.8 and 1.0 close to LiMPO4 while for M″=Sr, 0.2 ≤y≤0.8 and M″=Pb, 0.0 ≤y≤ 1.0. The third system corres…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic and Activation Parameters for a (Porphyrinato)cobalt-Alkyl Bond HomolysisBradford B. Wayland, Alexei A. Gridnev, Steven D. Ittel, and Michael FrydCite this: Inorg. Chem. 1994, 33, 17, 3830–3833Publication Date (Print):August 1, 1994Publication History Published…
Structural refinements of Sn-rich and Sn-poor colusite from the Lorano marble quarry, Italy, revealed that the crystals are isometric and belong to space group P43n. For Sn-rich colusite, CuS. and (As,Sn)S. tetrahedra are connected through comer sharing in a sphalerite structure with the composition CU26Sn2As,S32' and…
A detailed numerical investigation of anomalies in lossy metallic lamellar gratings is presented in a large interval of a wavelength-to-period λ/d ratio. A substantial increase in absorption (a decrease in the total diffracted energy) is observed. If λ/d is small enough (within the homogenized limit), the absorption c…
Abstract : In July 1980, the Department of Defense Explosives Safety Board (DDESB) Explosive Safety Standard DOD 6055.9-STD became linked with or referenced to the 1966 Kingery Hemispherical TNT Surface Burst airblast compilation. In 1984, a revised Kingery compilation was released. The 1984 Kingery paper presented th…
X‐ray photoelectron spectroscopy was used to study a lead‐based relaxor dielectric ceramic to identify the grain‐boundary phase most likely to be responsible for the insulation degradation of relaxor dielectric ceramics under humid loading conditions. The grain‐boundary phase consisted mainly of lead and oxygen. The b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDevelopment of Novel Functionalized Aryl Cyanate Ester Oligomers. 1. Synthesis and Thermal Characterization of the MonomersAdam Chaplin, Ian Hamerton, Brendan J. Howlin, and John M. BartonCite this: Macromolecules 1994, 27, 18, 4927–4935Publication Date (Print):August 1, 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocrosslinking of Poly(4-hydroxystyrene) via Electrophilic Aromatic Substitution: Use of Polyfunctional Benzylic Alcohols in the Design of Chemically Amplified Resist Materials with Tunable SensitivitiesS. Ming Lee, Jean M. J. Frechet, and C. Grant WillsonCite this: Macro…
The penetration of cathodic protection potentials under disbonded pipeline coatings has been studied. A physical model based on laboratory data has been developed. In neutral-pH, low-conductivity trapped water, effective protection potentials were found to penetrate less than 10 cm (4 in.) into a simulated disbondment…
The low energy X-ray response of Ge detectors with amorphous Ge entrance contacts has been evaluated. The spectral background due to near contact incomplete charge collection was found to consist of two components: a low level component which is insensitive to applied voltage and a high level step-like component which…
A multi-layer a-Si:H based thermal neutron detector was designed, fabricated and simulated by Monte Carlo method. The detector consists of two a-Si:H pin detectors prepared by plasma enhanced chemical vapor deposition (PECVD) and interfaced with coated layers of Gd, as a thermal neutron converter. Simulation results i…