Shape-selective alkane hydroxylation
A series of sterically hindered manganese porphyrins have been used to catalyse shape-selective alkane hydroxylation, Increasing the production of primary alcohols.
Materials Literature
文献浏览
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。
Effect of Defect Size and Notch Root Radius on Fracture Strength of Engineering Ceramics
各種の微小欠陥を付加したSi3N4とSiCの強度試験を行うとともに, 他の実験結果も併せて整理し, 欠陥寸法, 切欠き半径と強度の関係を求めた. その結果, 実際の機械部品で対象とするような100μm程度以下の微小な欠陥では, 破壊靱性値KICを一定とする線形破壊力学による評価結果は非安全側を与え, この傾向は結晶粒径の大きい材料ほど大であることが明らかとなった. 表面加工傷, 空孔, 人工欠陥等の各種の欠陥についての実験結果は, その形状効果を補正した等価き裂長さを用いることによって, 欠陥寸法と強度の関係は同一に取り扱うことができた. また, 各種セラミックスについての強度試験結果を, 等価き裂長さと平均結晶粒径の比ae/dと…
Ternary transition metal chalcogenides with framework structures and the characterization of their bonding by magnetic properties
Abstract
Design, Construction, and Use of Minnesota Woman, A Thermally Instrumented Mannequin
An adult female thermally instrumented mannequin was designed and constructed for apparel flammability research at the University of Minnesota. Forty-four chromel-alumel thermocouples (0.13 mm diameter) were encased in Pyrex, with measuring junctions exposed, and installed to measure surface temperatures during garmen…
Design and syntheses of macrocyclic hosts containing convergent hydroxy groups
The synthesis of three macrocyclic hosts containing convergent hydroxy groups is described; the cyclisation step is performed by using a ‘covalent template’ with boron.
Die Kristallstrukturen von NdAlGe2O7und NdGaGe2O7*
NdAlGe 2 O 7 and NdGaGe 2 O 7 crystallize in space group P 2 1 / c with a = 7.204(1), [7.208(1)] Å; b = 6.519(1), [6.603(1)] Å; c = 12.700(1), [12.823(1)] Å; β = 117.4(2)°, [117.4(2)°] and Z = 4. The structures have been determined from single crystal X-ray data. The final R -values are 0.0638 and 0.0231. In both stru…
The «integral rubber» concept ― an approach to an ideal tire tread rubber
On montre la relation entre les proprietes elastomeriques importantes et les domaines definis de temperature du facteur de perte mecanique. On en tire une relation de temperature ideale avec les proprietes viscoelastiques de caoutchoucs pour bandes de roulement. On prepare des polydienes a structure variee en presence…
Electrically conducting transition metal complexes of tetrathio-oxalate
Oligomeric complexes of tetrathio-oxalate with NiII, CuII, and PdII have been synthesized to yield materials having high electrical conductivities of up to 20 S cm–1.
Electrochemical Investigation of Hydrogen Storage in Metal Hydrides
A new technique has been developed to study and control hydrogen storage in solid metal hydrides. The formation of metal hydrides and their thermodynamic and kinetic properties have been investigated by electrochemical methods employing a low temperature molten salt galvanic cell of the type The choice of the electrol…
Optical properties of anisotropic periodic helical structures
An optical model is considered describing a wide class of optically anisotropic media such as chiral smectic liquid crystals and, in the limiting cases, cholesteric liquid crystals and anisotropic homogeneous media. It describes a structure having a periodicity along a given axis generated by a uniform rotation of the…
Studies on singlet oxygen in aqueous solution. Part 2. Water-soluble square-planar nickel complexes as quenchers
Three water-soluble square-planar nickel complexes have been investigated as quenchers of 1O2 in aqueous solution, using anthracene-9,10-bis(ethanesulphonate) as a trap. Disodium [NN′-ethylenebis(5-sulphosalicylideneiminato)] nickelate(II) and its propylene analogue are efficient quenchers, with kQ= 1.6 × 109 and 1.3…
Nearly Perfect Shape Memory Effect in Fe–Ni–C Alloys
Fig. 2 (a) Surface relief of martensite induced by bending at 77K in 25% ausformed specimen of Fe-3 1Ni-0.4C. (b) Identical area to (a) after heating to 550K .
The Chemistry of Platinum in the +3 Oxidation State
Abstract Platinum(III) is no longer an uncommon oxidation state. Numerous binuclear platinum(III) complexes have been prepared and structurally characterized over the past eight years. These include sulfate‐bridged dimers of D 4 h symmetry, [Pt 2 (SO 4 ) 4 L 2 ] 2− , L = H 2 O, DMSO; phosphate‐bridged complexes [Pt 2…
Microencapsulation and Controlled Release of Insulin from Polylactic Acid Microcapsules
Insulin has been encapsulated in biodegradable polylactic acid microcapsules and non-biodegradable ethylcellulose microcapsules by using an emulsification-solvent evaporation process. Gelatin and polyvinylalcohol were used as protective colloids. The concentrations and types of protective colloids affecting the microm…
Mechanisms of epoxidation during ozonation of carbon-carbon double bonds
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanisms of epoxidation during ozonation of carbon-carbon double bondsPhilip S. Bailey, Hank H. Hwang, and Chin Yun ChiangCite this: J. Org. Chem. 1985, 50, 2, 231–234Publication Date (Print):January 1, 1985Publication History Published online1 May 2002Published inissue 1…
Polymer degradation & stabilisation
The study of polymer degradation and stabilisation is of considerable practical importance as the industrial uses of polymeric materials continue to expand. In this book, the authors lucidly relate technological phenomena to the chemistry and physics of degradation and stabilisation processes. Degradation embraces a v…
Effects of Radiation on Materials: Twelfth International Symposium
Description Two volumes present recent research on radiation damage to structural materials in both fission and fusion environments. Seventy papers discuss: irradiation creep of structural metals; microstructural development; neutron-induced swelling; charge particle irradiation; theory of swelling; mechanical propert…
Cooperative phenomena in crystals containing off-center ions—dipole glass and ferroelectricity
Кооперативные явления РІ кристаллах СЃ нецентральными ионами — дипольное стекло Рё сегнетоэлектричество, Вугмейстер Р‘.Р•., Глинчук Рњ.Р”.
Effect of Impurity and Carrier Concentrations on Electrical Resistivity and Thermal Conductivity of Sic Ceramics Containing BeO
Silicon carbide ceramics with BeO as an additive exhibit unusually high electrical resistivity and thermal conductivity compared to conventional SiC ceramics. Studies concerning the effects of carrier concentration in the SiC grains on electrical properties and thermal conductivity are described. The low carrier conce…
Techniques of radiation dosimetry
Preface RADIATION ROUND-UP: Introductory Aspects of Radiation Basic Concepts of Radiation Physics and Dosimetric Units IONIZATION METHODS: Ionization Chamber Dosimetry Semiconductor-Junction Dosimetry Ion Implantation Dosimetry THERMAL METHODS: Thermoluminescence Dosimetry Thermally Stimulated Conductivity (TSC) Dosim…