Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
An efficient numerical technique for the implementation of Preisach-derived models is presented. It is shown that, when efficiently implemented, all Preisach-derived models require only a few table lookups at each field value to compute the magnetization for both locally reversible and irreversible components. In part…
In vitro degradation of two lots of Biomer, a commercial poly(ether urethane urea), has been investigated in order to understand possible mechanisms for in vivo degradation. Two lots of Biomer, BSUA001 and BSP067, were used in the study. Lot BSUA001 contained a poly(diisopropylaminoethyl-methacrylate), an ultraviolet-…
The structure factor of one-dimensional two-letter substitutional systems with arbitrary bond-length ratios is studied. New types of diffraction spectra were found, with \ensuremath{\delta}-peak positions determined by rational multiples of the type m/${\mathit{n}}^{\mathit{l}}$, l=0,...,\ensuremath{\infty}, of (i) a…
Author: Floudas, G. et al.; Genre: Journal Article; Issued: 1993; Title: DENSITY-FLUCTUATIONS IN BISPHENOL-A POLYCARBONATE AND<br/> TETRAMETHYL-BISPHENOL-A POLYCARBONATE AS STUDIED BY X-RAY-DIFFRACTION
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of bisphenol A polycarbonate in the glassy and rubbery states as studied by neutron scattering and complementary techniquesG. Floudas, J. S. Higgins, G. Meier, F. Kremer, and E. W. FischerCite this: Macromolecules 1993, 26, 7, 1676–1682Publication Date (Print):March…
A method that uses the magnetization M and the magnetic flux density B instead of using M and the magnetic field intensity H in the Preisach model is proposed. The Preisach distribution function and the Everett function obtained from M-B curves are compared with those of the conventional method. The former functions a…
The current and potential distribution on a pipe must be considered if cathodic corrosion protection will be provided with anodes placed in close proximity to the pipe. Correct design of a cathodic protection (CP) system will depend strongly on the types of holidays assumed to exist in pipe coating. Two models for the…
Electrical conductivity of zirconia stabilized with scandia and yttria (Sc 2 O 3 +Y 2 O 3 = 8 mol%) has been measured by the complex impedance method in the temperature range 573 to 1173 K. With increasing Sc 2 O 3 concentration, electrical conductivity increases at temperatures above 640 K, but it decreases below thi…
The first structurally characterized triplet diradical, the title compound, has approximate D3 symmetry with “propeller blades” of quinoidally distorted six-membered rings twisted in the same direction (picture on the right). According to calculations the spin and charge distributions differ considerably from one anot…
The material dependence on the emission characterisitics of metal-deposited field emitters has been investigated in order to determine the cathode material suitable for vacuum microelectronics devices. It is shown that the relationships between the intercepts and the slopes of the experimental F-N plots give the appar…
An Escherichia coli mutant multienzyme complex of fatty acid oxidation, composed of two 41-kDa beta-subunits and two 79-kDa mutant alpha-subunits with the alpha/Gly116-->Phe substitution, has been overproduced and purified. The catalytic properties of 3-ketoacyl-coenzyme A (CoA) thiolase and L-3-hydroxyacyl-CoA dehydr…
X-ray data are reported for the nematic phase near the nematic (N)--smectic-${\mathit{A}}_{1}$(Sm-${\mathit{A}}_{1}$) transition in a binary mixture of pentylphenylcyanobenzoyloxy benzoate (${\mathrm{DB}}_{5}$CN)+cyanobenzoyloxypentylstilbene (${\mathrm{C}}_{5}$ stilbene). These data and x-ray data from four other N--…
Substructure evolution has been studied by transmission electron microscopy in cyclically deformed copper polycrystals during conventional strain control testing and ramp loading. In both cases, and very similar to the substructure evolution previously reported for copper single crystals, dislocation structures develo…
Abstract Dehalogenation polycondensation of 4,7-dibromobenzimidazole and 4,7-dibromo-2,1,3-benzothiadiazole with a zero-valent nickel complex afford poly(benzimidazole-4,7-diyl) and poly(2,1,3-benzothiadiazole-4,7-diyl), respectively. These polymers give rise to electrochemically active doping-undoping cycles in both…
Humidity response characteristics of BaTiO 3 doped with lanthanum were examined using complex impedance measurements. A sample with relative density of 71% showed a nearly log‐linear increase of conductivity with humidity at 118 Hz. The average capacitance of bulk changed little with humidity; however, the resistance…
This article reports on chemical reactions and the properties they generated in artificial bone materials termed "organoapatites." These materials are synthesized using methodology we reported in the previous article of this series. Two different processes were studied here for the transition from organoapatite partic…
FT-IR microspectroscopy is used to compare the polymer and liquid crystal droplet regions within polymer-dispersed liquid crystal (PDLC) films. Thermoplastic polymer matrix PDLCs contain a higher amount of liquid crystal within the polymer regions than do thermoset polymer matrix films. IR functional group images of a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDistributions of chain ends and junction points in ordered block copolymersA. M. Mayes, R. D. Johnson, T. P. Russell, S. D. Smith, S. K. Satija, and C. F. MajkrzakCite this: Macromolecules 1993, 26, 5, 1047–1052Publication Date (Print):March 1, 1993Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic properties of amorphous polymers. 2. Anomalous temperature dependence of the steady-state recoverable compliance in low-molecular-weight polymersK. L. Ngai, D. J. Plazek, and C. A. BeroCite this: Macromolecules 1993, 26, 5, 1065–1071Publication Date (Print):Marc…
Abstract Oxidation of pyrrole yields a charged polymer film with incorporated anions. During the following reduction electroneutrality can be maintained by expulsion of these anions or by incorporation of cations. The contribution of both processes to the overall charge transport is found to depend strongly on the for…