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。
Hexasubstituted tribenzocyclononene derivatives with R = -OC(O)C 6 H 4 C n H 2n+i and R = -OC(O)C 6 H 4 OC n H 2n+1 possess enantiotropic pyramidic mesophases. These mesophases exhibit an uncommon feature in that their optical anisotropy changes sign as function of temperature within the mesophase region. It is sugges…
A three-dimensional mathematical model was developed for calculating joule heat release, glass flow, and heat transfer in electric glass furnaces. The model developed here allows for multiple electrodes, multiphase firing, and for the feeding and withdrawal of molten glass. The model is fairly general with respect to…
The shear flow behaviour of the nematic liquid crystal 4-n-octyl-4'-cyano-biphenyl (8CB) was studied in a torsional shear flow apparatus. Experiments were performed near the smectic A-nematic phase transition, and they concentrated on the observation of the tumbling instability associated with a positive Leslie viscos…
Abstract Experimental measurements of the optical reflectance of solid adenine films have been obtained for photon energies extending from 1.8 to 80 eV. From these data we have established the complex index of refraction, the complex dielectric function, and the energy‐loss function Im(‐l/). Structure in the dielectri…
Abstract not Available.
Films of isotactic polypropylene (iPP) were quenched at different temperatures. Wide-angle x-ray diffractograms for these samples show the presence of the smectic form of iPP at low quenching temperatures and the appearance of mono-clinic form on increasing the thickness of the substrate and the quenching temperature.…
Properties of phosphosilicate glass (PSG) films deposited by the plasma chemical vapor deposition (CVD), low‐pressure CVD, and atmospheric CVD methods are compared. Stress behavior of plasma PSG films is almost the same as that of low‐pressure PSG films. The stress values change from compressive to tensile with increa…
Collagen was isolated from rat tail tendons and acetylated with 1-14C acetic anhydride. In situ adsorption of this collagen from a buffer solution (pH = 2.7) was measured at the interfaces to air, polyethylene and polyethylene grafted with poly(maleic acid), respectively. The kinetics of adsorption were recorded for a…
Following removal of most of the telopeptide regions with pepsin, bovine dermal collagen gelled more slowly to form fibrils with a weak banding pattern. The reduction in gelling rate reflected an increase in the length of the nucleation phase and a lower rate of turbidity increase during the growth phase; the activati…
Five chemical decontamination processes have been developed for nuclear reactor applications. One of these processes is the cerium decontamination process (CDP). This method uses a cerium acid reagent to rapidly decontaminate surfaces, obtaining decontamination factors in excess of 300 in 6 h on pressurized water reac…
Using ultrasonic methods at ambient temperatures, for niobium carbide we determined the monocrystalline elastic stiffnesses: C11, C12, and C44 in Voigt’s contracted notation. From these, we calculated the quasi-isotropic (polycrystalline) elastic constants and the elastic Debye characteristic temperature. Results deri…
Complex alkali-borosilicate glasses are being studied, and used, as media for radioactive waste encapsulation. The effects of radiation from α-decay processes on the physical properties of such glasses is of interest. The energy deposited in the glass by such decay processes can be simulated by ion implantation. We ha…
A review of previously published hypotheses concerning phylogenetic relationships in the diatom family Achnanthaceae is presented. Data for characters such as valve ultrastructure, chloroplast number and morphology, and sexual reproduction for the genera Cocconeis, Achnanthes and Rhoicosphenia and their purported bira…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of hydrophobic particles on the foaming of aqueous surfactant solutionsMichael P. AronsonCite this: Langmuir 1986, 2, 5, 653–659Publication Date (Print):September 1, 1986Publication History Published online1 May 2002Published inissue 1 September 1986https://pubs.ac…
Abstract Kinetics of K + adsorption were investigated on kaolinite, a Chester loam soil and vermiculite using static, stirred, and vortex batch techniques. The objective of this study was to elucidate the rate‐limiting steps for K + adsorption on the clay minerals and soil. We hypothesized that it is possible under la…
Abstract Expressive memory effect has been proven in the course of the annealing of the β‐modification of polypropylene (β‐PP). The character of the structural changes taking place in β‐PP during annealing strongly depends on the thermal history. In dependence on the thermal history βα or ββ‐recrystallization takes pl…
The irreversible photobleaching of amorphous Ge30S70 films is found to depend on the air pressure during exposure. This is most probably a result of photo-oxidation and/or hydrolysis of the layers. The appearance of a Ge-O-Ge vibrational band in the infrared transmission spectra of exposed layers clearly indicates the…
Movement in a centric diatom, Actinocyclus subtilis, is reported here for the first time. The movement is directional and strong circumstantial evidence from histochemistry and electron microscopy supports the proposal that motility is achieved by the production of mucopolysaccharides through the labiate processes.
This letter reports the first measurements of differential cross-sections (DCS) for one- and two-electron capture by highly charged ions at low keV energies. These measurements have been achieved using a new type of spectrometer with a design based on a two-dimensional position-sensitive detector. A comparison of the…
Abstract The dilation of low‐density polyethylene accompanied by the sorption of CO 2 was measured by microscopy under pressures up to 50 atm at temperatures from 25 to 55°C. The dilatometry measurement, which is also applied to the determination of the thermal expansion coefficient, is directly performed by a catheto…