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。
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of catalysts on the kinetics of reduction of barite by carbonSatish B. Jagtap, Anita R. Pande, and Ashok N. GokarnCite this: Ind. Eng. Chem. Res. 1990, 29, 5, 795–799Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCytotoxic hydroperoxylepidozenes from the actinia Anthopleura pacifica UchidaGuo Chi Zheng, Akio Ichikawa, Midori O. Ishitsuka, Takenori Kusumi, Hiroshi Yamamoto, and Hiroshi KakisawaCite this: J. Org. Chem. 1990, 55, 11, 3677–3679Publication Date (Print):May 1, 1990Publicat…
X-ray photoelectron spectroscopy (XPS) and high resolution electron energy loss spectroscopy (HREELS) have been used to study the adsorption of polyimide precursor molecules on Ni(110). PMDA (1,2,4,5-benzenetetracarboxylic anhydride) and m-PDA (1,3-phenylenediamine) were vapor deposited in vacuo at substrate temperatu…
Abstract The 1 H-NMR results show that the majority of the isoprene units of butyl rubber are incorporated in 1,4 addition. Approximately 6% of the isoprene units undergo 1,2 enchainment. Based on our study of blends of polyisoprene with polyisobutylene, 1 H-NMR provides an excellent method for determining isoprene un…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn investigation of the morphology of amorphous/semicrystalline nylon blends using small-angle x-ray scatteringMark E. Myers, Andrew M. Wims, Thomas S. Ellis, and John BarnesCite this: Macromolecules 1990, 23, 10, 2807–2814Publication Date (Print):May 1, 1990Publication Hist…
Abstract The adaptation of the Iosipescu test as a method for determination of the stress and strain to failure and the shear modulus of adhesives under uniform shear conditions is described. The design and performance of a number of special purpose instruments and jigs to facilitate sample preparation, bond line thic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet oxygen formation in a solid organic polymer upon irradiation of the oxygen-polymer charge-transfer bandPeter R. Ogilby, Marianne Kristiansen, and Roger L. CloughCite this: Macromolecules 1990, 23, 10, 2698–2704Publication Date (Print):May 1, 1990Publication History P…
Chemisorption of polar organic compounds on iron in containing SH − was discussed on the basis of the hard and soft acids and bases principle (HSAB principle). According to the Frumkin isotherm, surface coverages of the compounds and SH − were determined from the double layer capacitances obtained by impedance measure…
Reduction of [OsVI(P)(O)2] (P = porphyrin dianion) with PPh3, ascorbic acid, or N2H4·H2O in the presence of ROH and RSH yielded [OsIV(P)(OR)2] and [OsIV(P)(SR)2], respectively. [OsIV(OEP)Br2] (H2OEP = octaethylporphyrin) was prepared from [OsVI(OEP)(O)2] and Br2. The dialkoxyosmium(IV) and dibromoosmium(IV) porphyrin…
The coercivity Hci of melt-spun Sm-Fe-Ti alloys can be increased to above 4.0 kA/cm by the addition of Zr and Co. Co-substitutions also enhance the remanence Jr and suppress the formation of α-Fe, both of which result in a high-energy product, (BH)max, of up to 56 kJ/m3, the highest value reported so far for 1:12-type…
Amorphous Sm(Fe11Ti) ribbons were prepared by melt spinning. After heat treatment, very fine grains (≊50 nm) of the ThMn12-structure phase were obtained with no signs of a separate intergranular phase. Each grain appears to be a single domain. The maximum room-temperature coercivity is 0.56 T, rising to 1.20 T at 11 K…
Nd15.4Fe77.8B6.8 magnets of various degrees of crystal alignment have been prepared by the conventional powder metallurgy technique. The alignment of these magnets have been determined by x-ray diffraction and fitting the standard deviation of a Gaussian distribution for the relative intensity versus the angle between…
The magnetic behavior of Mn(SCN${)}_{2}$(${\mathrm{CH}}_{3}$OH${)}_{2}$ in single-crystal form has been studied, and the crystal structure has also been determined. The system is monoclinic, C2/c, Z=4 with a=14.467(5) \AA{}, b=5.927(2) \AA{}, c=10.979(3) \AA{}, and \ensuremath{\beta}=93.19(3)\ifmmode^\circ\else\textde…
Abstract For three series of bimodal networks, the stress-relaxation rates and the tearing energies were shown to exhibit maxima at about the same concentrations of short chains as those at which the tensile strengths, reported earlier, also exhibit maxima. These findings clearly show that the reinforcement produced b…
The influence of heat treatments on the intergranular attack (IGA) and intergranular stress corrosion cracking (IGSCC) resistance of Inconel(1) 690 (UNS(2) N06690) were studied. The chromium profiles adjacent to the grain boundary were predicted by thermodynamic and kinetic modeling and benchmarked with experimental r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymers of carbonic acid. 3. Thermotropic polycarbonates derived from 4,4'-dihydroxybiphenyl and various diphenolsHans R. Kricheldorf and Dirk LuebbersCite this: Macromolecules 1990, 23, 10, 2656–2662Publication Date (Print):May 1, 1990Publication History Published online1…
Terfenol (Tb0.3Dy0.7Fe1.9) and related materials have proven useful as electromechanical transducers. As with other transducers, these materials exhibit hysteresis, which must be included in any model of the transducer. Preisach theory is one of the available models that includes the effects of hysteresis. The theory…
Magnetic properties of melt-spun Co80Zr20−xBx microcrystalline alloys (0≤x≤8) depend crucially on the quench rate.The optimized values of Hc =2.68 kOe and (BH)max =2.10 MG Oe were obtained for Co80Zr16B4 melt-spun with the substrate surface velocity of 48 m/s. A new crystalline phase of Co5Zr was observed.
Rylene sind anellierte Arene , die formal durch Verknüpfung aller peri ‐Positionen von Naphthalin entstehen. Als Modelle für „Polyrylen”︁ 1 , R = H, wurden mehrere lösliche Oligorylene synthetisiert. Bei ihrer Charakterisierung fallen vor allem die geringe HOMO/LUMO‐Energiedifferenz des Quaterrylens 2 , R = t Bu, n =…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic and geometric structures of several states of diatomic scandium nitrideKathryn L. Kunze and James F. HarrisonCite this: J. Am. Chem. Soc. 1990, 112, 10, 3812–3825Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1…