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。
The emission and excitation spectra of the Eu3+ luminescence and the energy transfer phenomena in single crystals of Gd1−xEuxAl3B4O12 (0<x?1) have been investigated using time-resolved site-selection techniques. In addition, the luminescence properties of single crystals and powders have been compared. The resu…
Enhancement of the Raman scattering and fluorescence emission on noble metals (Ag, Cu, and Au) is believed to be caused in part by large local fields at the incident wavelength on the surface of metallic microstructures, such as colloidal suspensions and surface roughness on electrodes and thin films. For metallic sph…
Potassium acid phthalate (COOKC 6 H 4 COOH) single crystals were grown from aqueous solutions. The cleavage surfaces were examined by multiple-beam interferometry. Solvent etching was used to delineate the dislocations, and their distribution and branching were investigated. The (001), (010) and (100) faces were subje…
The author considers a polycrystal composed of crystallites for which the response to a hydrostatic pressure is a pure dilatation. Cubic crystals have this property, but it might also be possessed by crystals of lower symmetry. It is proved that the polycrystal also has this property and, regardless of the distributio…
We report what we believe is the first experimental measurement of biaxiality in a cholesteric phase. This observation is made in a selectively deuterated nematic that was twisted by the addition of a chiral compound. A theoretically predicted biaxial order parameter (measured in terms of an asymmetry in the time-aver…
Abstract Radiochemical oxidation of Mn2(μ-AsPh2)2(CO)8 in Freon mixture glass gives its cation radical, ESR spectra of which are most consistent with the odd electron orbital with σ*MnMn character consisting mainly of Mn 3d and As 4p atomic orbitals.
Seven methods for the detection of thermal oxidation of the inner wall surface of high-density polyethylene (HDPE) pipes are presented. The methods presented include infrared spectroscopy, polarized light microscopy, differential scanning calorimetry, scanning electron microscopy, gloss measurements and uniaxial creep…
Abstract The X-ray photoelectron spectra (XPS) were measured in order to obtain the Nls and Cls core-orbital energies of ten ethylenediamine and 21 cyano complexes of transition metals. The difference between the Nls and Cls energies, ΔE, which was found to be hardly affected by the counter ion or by charging, was acc…
Cast (unoriented) PAN films show equilibrium swelling corresponding to about 250-wt% gain in 0.4-molal aqueous potasium triiodide solution. In this “first-stage” swollen state, the film is still rigid and the swelling produces almost no increase in dimensions of the sample. In creep experiments carried out while immer…
Research Papers The History of Tribology in America D. Dowson D. Dowson Institute of Tribology, Department of Mechanical Engineering, The University of Leeds, Leeds, LS2 9JT, England Search for other works by this author on: This Site PubMed Google Scholar Author and Article Information D. Dowson Institute of Tribolog…
The effects of controlled porosity on the dielectric breakdown of sintered MgAl 2 O 4 were measured using an acoustic emission technique. Results are compared to a statistical model relating dielectric strength to a random distribution of spherical pores and the probability of pores aligned in a vertical column. Data…
Abstract Deconvolution of X-ray excited Mg Is photoelectron and Auger (KL23L23) electron spectra of Mg-montmorillonite into the spectra of the exchangeable and non-exchangeable skeletal magnesium of the clay revealed considerable difference in the electronic state for magnesium of the two origins. The chemical state o…
Tensile strength of specimens of coated fabric which had a crack, a bias crack and a circular defect respectively was measured using a uniaxial and using a biaxial tensile tester. Then, uniaxial and biaxial tensile strength figures were compared, and strengths for the three types of defect condition were compared. Fur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures of the picoline N-oxide complexes M(4-CH3C5H4NO)6(ClO4)2 (M = copper,zinc) and EPR spectra of the pure and zinc-doped copper complexesJ. S. Wood, R. O. Day, C. P. Keijzers, E. De Boer, A. E. Yildirim, and A. A. K. KlaassenCite this: Inorg. Chem. 1981, 20,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProcess simulation of ammonia plantChandra P. P. Singh and Deoki N. SarafCite this: Ind. Eng. Chem. Process Des. Dev. 1981, 20, 3, 425–433Publication Date (Print):July 1, 1981Publication History Published online1 May 2002Published inissue 1 July 1981https://pubs.acs.org/doi/…
ABSTRACT The purpose of this study was to quantify nucleic acids in bone marrow and to determine if nucleic acid levels in mechanically deboned meat (MDM) which contains marrow are high enough to be nutritionally hazardous. Bone marrow from cervical and lumbar vertebrae, MDM and longissimus muscle samples were analyze…
Breakdown of the thin air-formed oxide film is the first step in the corrosion of steel exposed to aqueous chloride environments. We studied oxide-film breakdown by observing changes, with time, of appearance, weight loss, and corrosion potential while varying the three components of the system: environment, substrate…
Abstract Reduction of acetylene to ethylene is catalyzed by [Fe4S4(SPh)4]n-([4-Fe]n-, n = 3, 4) or [Mo2Fe6S9(SPh)8]m- ([Mo–Fe]m-, m = 4, 5) produced by controlled potential electrolysis of [4-Fe]2− or [Mo-Fe]3− in MeOH/THF and in H2O. The catalytic activity increases in the order [Mo–Fe]4− << [4-Fe]3− ≅…
Abstract Self‐trapped hole (STH) and self‐trapped exciton (STE) states which are formed in Y 3 Al 5 O 12 , Y 2 SiO 5 , and TR 2 Si 2 O 7 crystals under γ‐irradiation in the temperature interval of 77 to 200 K are investigated. The STH is shown to be molecular O , absorbing at 1.6 eV (for Y 3 Al 5 O 12 ) and at 1.65 eV…
Stress corrosion cracking investigations on U-bend samples of sensitized 304 austenitic stainless steel have been conducted in sulfurous acid solutions in the concentration range, 0.40 to 10% at ambient temperatures. Samples were found to fracture in solutions of more than 3% sulfurous acid. Chemical analysis of solut…