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。
Wet adhesion of paint film on Zn-Ni alloy electroplated steel sheet is significantly affected by the metal ion balance in phosphate solution. Variation of the Ni++ ratio in phosphate solution changes the Ni content of phosphate film formed. As the Ni content of phosphate film increases, the wet adhesion of paint film…
Single crystals of optical quality of l -glutamic acid chloride, bromide and iodide with dimensions up to 80 × 30 × 20 mm have been grown from aqueous solutions by controlled lowering of temperature from 315 to 300 K. The isotypic crystals possess quite similar physical properties. Strong anisotropic effects are found…
A theoretical interpretation is made of the magnetic susceptibilities of the dinuclear rare-earth complexes of phthalocyanine [RE2(pc)(dpm)4][where RE = Sm3+–Yb3+ and Y3+, pc = phthalocyaninato(2-) and dpm = 2,2,6,6-tetramethylheptane-3,5-dionato(1-)] measured from 77 to 300 K. The tendencies of the magnetic moments t…
Abstract The diffraction pattern of any material contains structural and chemical property information that can be extracted using radial distribution function analysis. This article provides an introduction to the technique and presents several examples highlighting various ways in which it can be used. It begins wit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT13C-nmr Studies of CedranolidesP. Joseph-Nathan, A. Gutiérrez, J. D. Hernández, L. U. Román, and R. L. SantillanCite this: J. Nat. Prod. 1986, 49, 1, 79–89Publication Date (Print):January 1, 1986Publication History Published online1 July 2004Published inissue 1 January 1986h…
Materials deform faster under stress in the presence of irradiation by a process known as irradiation creep. This phenomenon is important to reactor design and has been the subject of a large number of experimental and theoretical investigations. This purpose of this work is to review the recent experimental results t…
The adsorption of nitrogen over an alumina-supported cobalt catalyst has been studied by means of infrared spectroscopy. An infrared band due to dinitrogen species adsorbed over the catalyst appears at 2214 cm–1 at 93 K. The band shifts to lower frequency by ca. 20 cm–1 in the presence of strongly adsorbed hydrogen, w…
The impurity diffusion coefficient of tin in γ-iron has been determined by the serial sectioning method with the radioactive tracer 113Sn in the temperature range between 1197 and 1653 K. The temperature dependence of the diffusion coefficient shows the linear Arrhenius relationship, expressed byD=(0.845−0.119+0.141)×…
Temperature dependence of electrical conductivity has been studied for hot pressed AlN ceramic having different volume percentage of porosity (0.2 to 15 %) in the temperature range (500 K to 950 K). It has been observed that electrical conductivity decreases by two orders of magnitude as the volume percentage of poros…
For a nematic solution of polydisperse rigid rods the osmotic pressure is proved to be independent of the length distribution and proportional simply to the total number density. This rule holds in the gaussian approximation to the Onsager theory. Its accuracy is demonstrated for bidisperse systems.
SummaryThe surface roughening of commercial purity aluminium for lithographic printing plates is commonly carried out by A. C. etching in dilute acids to produce a fairly uniform distribution of small pits. The uniformity of the etching process is affected by metal structure and composition.Techniques developed to sho…
Some principles of protection afforded by clothing in fire situations are reviewed briefly. Several examples of measurements of heat protective properties are given. The materials covered are single layers of fabrics appropriate for work uniforms, the same type of fabric combined with four popular underwear fabrics, a…
The kinetics of hydration of α-CaSO4·0.5H2O has been studied by calorimetry, analysis of the liquid phase, measurement of the combined water, and electron microscopic observations. Hemihydrate particles dissolve immediately after mixing with water and subsequently form hydrated layers on their surfaces by intrusion of…
The equilibrium constants associated with the inclusion compounds of n-butanol and n-pentanol with α-cyclodextrin in aqueous solutions have been measured using the head-space analysis technique involving gas chromatography. These data confirm that a 1:1 inclusion complex is formed. The kinetics associated with the for…
The dependence of ΔKth on crack size and geometry, and Vickers hardness Hv under stress ratio R=-1 was studied. The effects of crack size and geometry are unified with a geometrical parameter √(area) which is the square root of the area occupied by projecting defects or cracks onto the plane normal to the maximum tens…
Abstract The band structure in the high‐symmetry points of the TIGaSe 2 , Brillouin zone is calculated by the pseudopotential method. The top of the valence band is found to be located at the Γ point. The bottom of the conduction band is located at the line Γ–Y and the additional extremum of this band – at the point Γ…
The ASTM oxygen index, a standard atmospheric pressure test for comparing the flammability of plastics, has been used in combination with other tests to evaluate the suitability of nonmetals for use in oxygen service. In 1983, this test was extended to allow measurements at pressures to 2 MPa (300 psig). This paper de…
Surface-enhanced Raman scattering (SERS) of 3,5-pyridinedicarboxylate on colloidal gold in aqueous media and of the azo dye, dabsyl(N-4-dimethylaminoazobenzene-4′-sulphonyl) aspartate (DABS-ASP), on colloidal gold in ethanol was observed. Enhanced Raman spectra and excitation profiles over wavelengths 457.9–676.4 nm w…
Pulse radiolytic oxidation of zinc tetrakis(hydroxyphenyl)porphyrins in neutral solution results in formation of the π-radical cations which decay via disproportionation over a few ms. In alkaline solution, the hydroxy groups are dissociated and for the ortho and meta isomers the rate of disproportionation is reduced…
SUMMARY The wear algorithm described In this paper has the capability to predict the shapes into which rail vehicle wheels and rails wear in tangent track use. Results of the algorithm applied to a freight car model show that the wheel profiles wear into shapes that are nearly identical for four different wear model f…