Materials Literature
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Abstract Thermal polymerization of acrylamide was studied by differential scanning calorimetry. Latent heat of fusion Δ H f and enthalpy of polymerization Δ H p values were found to be 36 and −18.0 kcal mol −1 , respectively. The overall activation energy E for the polymerization was calculated to be 19 k cal mol −1 u…
Experimental and theoretical work on the transverse ballistic impact of Kevlar and nylon fabrics is presented in two parts. Part I is an experimental investigation into (a) the relation between the multi-layer and single layer impact; (b) the effect of fabric finishes; and (c) the effect of weave. A simple model of im…
Abstract 13C NMR spectra of chitin oligomers in aqueous solution were analyzed for a reference of assignment of solid state 13C NMR spectra of chitin and N-acyl chitosans, and also of 13C chemical shift data in aqueous solution.
The Manual presents a methodology for integrating projectile impact damage tolerance into aircraft structural design. The information is presented in three sections: (1) Description of Projectile Threats; (2) Analysis Methods for Predicting Structural Response to Projectile Impact; and (3) Design Guidelines for Impact…
A spherical Fabry Perot interferometer is used to determine the refractive index of argon to a few hundred bars, with a better accuracy than those obtained in preceding experiments.The first and second refractivity virial coefficients have been determined. Measurements have been made for eight wavelengths in the visib…
Alumina and silica powders were sintered at 1250° to 1460°C in the presence of liquid phases containing CaO, A1 2 O 3 , and SiO 2 . The data were analyzed using the equation D = K log t +C and the Arrhenius equation. The activation energy for sintering decreases with increasing amounts of liquid phase.
Abstract Preparations have been made of acid‐soluble collagens whose telopeptides have suffered different levels of proteolytic attack. The collagens with more intact telopeptides form fibrils more rapidly than those with degraded telopeptides. In addition, we have shown that a high molecular weight aggregate rich in…
A method has been developed that can be used to describe the volume of space occupied by a given molecule with a known conformational structure as it rotates about a defined axis. The packing requirements of these volumes of revolution have been utilized in the prediction of phase formation, particularly of the B and…
Pyroelectric-piezoelecric glass ceramics of polar materials like Li2Si2O5, Ba2TiGe2O8, Ba2TiSi2O8, and Various compositions in the systems Li2O-B2O3, Li2O-SiO2-ZnO, Li2O-SiO2-B2O3 have been prepared by oriented recrystallization of the glasses under a strong temperature gradient, providing a simple inexpensive process…
Abstract The materials problems of capacitor ceramics are discussed with emphasis on recent advances in scientific understanding of means of achieving higher dielectric constants, better voltage stability, use of cheaper electrode materials (Ag or Ag-rich Ag-Pd alloys) and lower sintering temperatures(for energy savin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDodecamolybdotetrakis(organoarsonates) and the structure of a neutral zwitterionic heteropoly complexK. M. Barkigia, L. M. Rajkovic-Blazer, M. T. Pope, and C. O. QuicksallCite this: Inorg. Chem. 1981, 20, 10, 3318–3323Publication Date (Print):October 1, 1981Publication Histo…
Four-spin exchange interactions in fcc spin lattice are investigated for the purpose of understanding anomalous magnetic properties of NiS 2 with pyrite structure. It is shown that a phase transition is possible from the ordered phase with the first-kind spin ordering to the other ordered phase in which the second-kin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of decacarbonylmanganesetechnetium and decacarbonyltechnetiumrheniumGary D. Michels and Harry J. SvecCite this: Inorg. Chem. 1981, 20, 10, 3445–3447Publication Date (Print):October 1, 1981Publication History Published online1 May 2002Published inissue 1 Octo…
Sinterable cubic aluminum oxy nitride (ALON) has been prepared by carbon reduction of aluminum oxide inflowing nitrogen. Three different sources of Al 2 O 3 (A1 2 O 3 from clay, commercial A1 2 O 3 , and A1 2 O 3 derived from AlCl 3 .6H 2 O) and two different sources of carbon (carbon black and starch) were used. Pres…
BaTiO3 has been sintered at 1000-1100°C for periods from 1/6 to 2 hours with 10-20 wt% glass of 74mole% Bi2O3 - 26% B2O3 composition. The resulting composites, consisting of BaTiO3 grains surrounded by a glass, show ϵRT=1300-1500 and ϵmax=2500. The Curie temperature is nearly unaffected by the amount of the glass cont…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic, crystallographic, and hydrogen-storage characteristics of Zr1-xTixMn2 hydridesH. Fujii, F. Pourarian, V. K. Sinha, and W. E. WallaceCite this: J. Phys. Chem. 1981, 85, 21, 3112–3116Publication Date (Print):October 1, 1981Publication History Published online1 May 20…
SUMMARY The atomic number dependence of electron backscattering can be used as the basis of a microanalysis technique. The operating procedures and condition for quantitative measurements of specimen atomic number are outlined and an expression relating the accuracy of composition to the atomic number sensitivity has…
Potentiostatically controlled slow strain rate tensile tests were conducted on AISI 1018 mild steel in hot (92°C) caustic solutions of and in a chemically inert cell. Reduction of area was used as a measure of susceptibility to stress corrosion cracking (SCC). The presence of sulfide ions raised the active‐passive tra…
Polarization microscope studies on single crystal samples of pb(Fe1/2 Nb 1/2)o3 [PFN] have been made. Thin platelets (<60μ) show large, homogeneous ferroelectric domains and optical characterization shows PFN is trigonal at room temperature and optically negative. Birefringence measurements between 4.2k and 400k revea…
Nuclear grade production tubing of Alloy 600 was evaluated for stress corrosion cracking (SCC) susceptibility in high purity water at 365, 345, 325, and 290 C. Reverse tube U-bend specimens provided crack initiation data and constant extension rate tests were employed to determine the crack velocities experienced in t…