Materials Literature
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The Weibull distribution for the strength of a long fiber is reviewed, with emphasis on its derivation via extreme-value theory. It is shown that a corresponding Weibull distribution, but with different scale and shape parameters, is appropriate for the lower tail distribution of a bundle of parallel fibers under gene…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure-property relationships of polyacetylene/polybutadiene blendsMichael F. Rubner, Sukant K. Tripathy, J. Georger Jr., and P. CholewaCite this: Macromolecules 1983, 16, 6, 870–875Publication Date (Print):June 1, 1983Publication History Published online1 May 2002Publish…
Smaller, more charge-intensive electrodes are needed for "safe" stimulation of the nervous system. In this paper we review critical concepts and the state of the art in electrodes. Control of charge density and charge balance are essential to avoid tissue electrolysis. Chemical criteria for "safe" stimulation are revi…
The antiferromagnetic phases of MnO, NiO, and the solid solutions ${\mathrm{Mn}}_{x}{\mathrm{Ni}}_{1\ensuremath{-}x}\mathrm{O}$ ($x=0.24, 0.48, 0.77$) have been examined by high-resolution powder neutron diffraction. The solid solutions have random cation distributions, and N\'eel temperature and mean cation-moment me…
The paper focuses on the derivation of the constitutive law for a material containing flat, planar microcracks. The damage law is derived from the dissipation potential in conjunction with the orthogonality principle. The dissipation potential is shown to exist in the space of conjugate thermodynamic forces related to…
Large single crystals of black phosphorus have been grown under high pressure, and by using the crystals, the Hall measurements have been done in a range from 4.2 K to 550 K. All the undoped samples have exhibited p -type conduction, while we have succeeded in obtaining n -type crystals by doping Te impurity. The effe…
Polyacetylene/polysiloxane interface states have been investigated using metal-insulator-semiconductor (MIS) diodes. The 1-mm2 MIS diodes (Al/polysiloxane/polyacetylene) have been fabricated by use of a conventional photolithographic technique. The I-V and C-V measurements were used to explore the polyacetylene/polysi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of dopant on the physicochemical and electrical properties of organic conducting polymersG. Tourillon and F. GarnierCite this: J. Phys. Chem. 1983, 87, 13, 2289–2292Publication Date (Print):June 1, 1983Publication History Published online1 May 2002Published inissue 1…
Indium tin oxide (ITO) films have been prepared by the magnetron sputtering technique from a target of a mixture of In2O3 and SnO2 in the proportion 9:1 by weight. By optimizing the deposition conditions it has been possible to produce highly transparent (transmission ∼90%) and conducting (resistivity ∼10−5 Ω cm) ITO…
A detailed study of the polarization and depolarization behavior of 7:65:35 and 8:65:35 lead lathanum zirconate titanate transparent ceramics under dc bias and constant heating rates has been carried out. The dielectric permittivity exhibits a new anomaly near 0 °C in freshly thermally depoled samples which is associa…
Abstract A preparative method has been established for obtaining chitosan products which have a desired degree of deacetylation of up to virtually 100%. Effective deacetylation was attained by intermitently washing the intermediate product in water two or more times during the alkali treatment. The weight average mole…
Optical-absorption, -emission, and -excitation spectra are presented for ${\mathrm{Er}}^{3+}$ ions in fluorozirconate glass. Measured oscillator strengths of the transitions between $J$ manifolds at 300 and 15 K are compared with calculated electric and magnetic dipole oscillator strengths. Radiative rates for five lu…
A permanent human cell line, EA . hy 926, has been established that expresses at least one highly differentiated function of vascular endothelium, factor VIII-related antigen. This line was derived by fusing human umbilical vein endothelial cells with the permanent human cell line A549. Hybrid cells that survived in s…
Abstract Am aufgezeichneten Beispiel wird unter Verwendung eines bifunktionellen Si1an‐Grenzflächenaktiven Stoffes durch sukzessive Chemisorption und chemische Aktivierung der Aufbau mehrschichtiger Filme wie (III) und (V) aus einschichtigen demonstriert.
The thermal conductivity, lambda , and the specific heat capacity at constant pressure, c p , have been measured for solid sodium chlorate (NaClO 3 ) in the temperature range 100-300K. Differential scanning calorimetry (DSC) was used to measure c p at atmospheric pressure, whilst the transient hot-wire method was used…
This paper reports the results of an x-ray diffuse scattering study of the melting transition of monolayer xenon on the surface of single crystals of exfoliated graphite. It is found that the two-dimensional xenon solid melts into an orientationally ordered liquid (or hexatic) phase. The temperature dependence of the…
The dependence of the dielectric constant on the electric field of PZT ceramics can be well explained by the mechanism of domain wall motion. The mobility of the domain wall is increased by the A-site vacancies, due to the reduction of local stress in the domains which undergo domain switching. But O-site vacancies an…
PZT ceramics with various impurities were prepared by the powder metallurgy method, in the temperature range 1150-1350 degrees C. The electrical resistivity of each composition has been studied. Explanations based on the distribution model were given. Within the solubility limit, the impurities can produce A-site vaca…
The influence of impurities on piezoelectric parameters such as the radial coupling factor k r and mechanical quality factor Q m have been measured. A mechanism of internal friction is proposed. The effects of the interaction of 90 degrees domain walls with defects introduced by impurities are explained. A-site vacanc…
The authors have examined the magnetic structures of the antiferromagnetic layered compounds Co 1/3 NbS 2 and Co 1/3 TaS 2 using single-crystal neutron photographic and counting methods. The magnetic structure of Co 1/3 NbS 2 has been determined in detail, and has an orthohexagonal unit cell, containing two Co atoms,…