The Raman spectra of Co3O4
The Raman spectra of single-crystal Co 3 O 4 have been measured at 312 K. Five Raman-active modes were found and identified at 194, 482, 522, 618 and 691 cm -1 .
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。
Loss of Antioxidants from High-Density Polyethylene
The loss of the antioxidants BHA and BHT from HDPE film was measured experimentally and analyzed theoretically. The volatilization of the antioxidant from the polymer surface was found to be the controlling parameter for mass transfer. Diffusion coefficients of the antioxidants evaluated from the experimental data and…
Two components of an extracellular protein aggregate of Clostridium thermocellum together degrade crystalline cellulose
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo components of an extracellular protein aggregate of Clostridium thermocellum together degrade crystalline celluloseJ. H. David Wu, William H. Orme-Johnson, and Arnold L. DemainCite this: Biochemistry 1988, 27, 5, 1703–1709Publication Date (Print):March 8, 1988Publication…
An investigation of the contribution made by the carboxylate group of an active site histidine-aspartate couple to binding and catalysis in lactate dehydrogenase
The influence of aspartate-168 on the proton-donating and -accepting properties of histidine-195 (the active site acid/base catalyst in lactate dehydrogenase) was evaluated by use of site-directed mutagenesis to change the residue to asparagine and to alanine. Despite the fact that asparagine could form a hydrogen bon…
Benthic Diatoms From Laguna Figueroa, Baja California
RESUMENDurante el verano de 1984 se colectaron siete muestras de sedimentos y lama sobrenadante de tres zonas, para analizar las asociaciones de diatomeas bentónicas en la Laguna Figueroa, BC, Mtico.Se identificaron un total de 67 taxa entre especiesy variedades.Se utilizó un tamaño de muestra de 300 individuos, los v…
Studies on Organomercury(II) Complexes of Isoniacinamide
Organomercury(II) complexes involving isoniacinamide(I) of the type. RHgCl(L)(II) [R = phenyl, o-, p-hydroxyphenyl ( o-, p-HOC 6 H 4 ) , p-acetoxyphenyl (p-AcOC 6 H 4 ), 2-furyl (2-C 4 H 3 O); L = isoniacinamide] have been synthesized and characterized. Conductance measurements indicate that the complexes are non-elec…
Quaternization of regenerated cellulose under homogeneous reaction conditions
Abstract The optimal reaction conditions of the homogeneous quaternization of regenerated cellulose with 3‐chloro‐2‐hydroxypropyltrimethylammonium chloride in solutions of benzyltriethylammonium hydroxide are established. Content of 6% of regenerated cellulose with the DP 320 in 1.8 M solution of BTEA‐OH at the molar…
Effects of Thermal Cycling on the Mechanical and Physical Properties of a Space Qualified Epoxy Adhesive
Structural adhesives used for space applications must be able to survive large tempera ture fluctuations while maintaining their mechanical strength. This paper describes a series of experiments performed to document property degradation of Hysol Corps EA 956 epoxy due to temperature extremes experienced in the orbita…
Measurement of spontaneous polarisation by field reversal
The measurement of spontaneous polarisation in ferroelectric smectic-C liquid crystals is discussed. The method employed is that of field reversal and a new approach is described for the background current to be subtracted electronically from the current during switching to derive the component due to the polarisation…
High-Temperature Polarization Behavior of Carbon Steel in Alkaline Sulfide Solution
The high-temperature (to 150 C) electrochemical polarization behavior of steel in highly alkaline sulfide solutions containing 2.5 molal (m) NaOH + 0.5 m Na2S is described. Anodic polarization and cyclic voltammetry were used. The behavior has been interpreted with reference to calculated thermodynamic electrode poten…
Directions of the Electronic Transition Moments in Dioxido-p-terphenyl
The directions of the absorption, fluorescence and phosphorescence transition moments of dioxido-p-terphenyl are determined from measurements of the absorption and emission anisotropies as functions of the dichroic ratio in stretched PVA films.
Modeling the behavior of oriented permanent magnet material using current doublet theory
A method is presented for modeling two-dimensional dipoles, quadrupoles, and other higher multipoles built using oriented permanent-magnet materials such as samarium cobalt. The technique uses a complex current doublet to model the magnetized material. This technique can be used in conjunction with an infinitely perme…
Dielectric study of the phase transition in phenanthrene
Dielectric and pyroelectric behaviour of phenanthrene single crystals between 20 and 90°C have been investigated. Sharp peaks of ε have been observed during first heating of the samples. The pyroelectric charge in b-direction has been detected without a biasing field. The most probable explanation of all data availabl…
Mathematical and experimental foundations of linear polycondensation modeling. 1. Modeling and simulation of linear, irreversible polycondensation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMathematical and experimental foundations of linear polycondensation modeling. 1. Modeling and simulation of linear, irreversible polycondensationM. R. N. Costa and J. VillermauxCite this: Ind. Eng. Chem. Res. 1988, 27, 3, 421–429Publication Date (Print):March 1, 1988Publica…
Summary Abstract: Scanning tunneling microscopy investigation of 2H-MoS2: A layered semiconducting transition-metal dichalcogenide
Scanning tunneling microscopy (STM) has been enormously \nsuccessful in solving several important problems in the geometric and electronic structure of homogeneous metallic and semiconducting surfaces. A central question which remains to be answered with respect to the study of \ncompound surfaces, however, is…
Magnetic and mechanical properties of ZrO/sub 2/ doped NiZn ferrites
The magnetic and mechanical properties of zirconia-added NiZn ferrite were studied. It was found that the addition of small amounts of ZrO/sub 2/ improves their magnetic properties to a great extent. Magnetic losses at 10 MHz decreased by a factor of two with no significant change in permeability whereas the flexural…
A contribution to the study of the catalytic action of clays on the polymerization of styrene: II. Reaction mechanism
Abstract The study of 13 C NMR spectra of polystyrene thermally obtained on clays shows that thermal polymerization of styrene on these minerals proceeds by two parallel reaction mechanisms: the radical mechanism due to the thermal effect, and the cationic mechanism in which the initiatory cation H + is provided by th…
Behavior of high-performance alloys in sulfuric acid
Sulfuric acid is an important reactant and by-product in the mining and metal extraction industries. Corrosion in sulfuric acid is dependent on both the concentration of the acid and the type of impurities present in the acid. The behavior of a variety of stainless steels and Ni-bse alloys is examined as a function of…
A dynamic hysteresis model
The static hysteresis model which is based on Frohlich equations is extended to simulate the dynamic B-H behavior including hysteresis. In order to describe the dynamic model, the following conditions are required: the magnetizing curve, the relationship between H/sub c/ with H/sub m/ (or B/sub m/) and B/sub r/ with B…
Elevated temperature behavior of sintered Nd-Fe-B type magnets
The effects of elevated temperature air exposure at 75 degrees , 100 degrees , 125 degrees , and 150 degrees C on the performance of sintered Nd-Fe-B type permanent magnets was investigated. The observations include a comparison of the initial and final demagnetization curves after long-term aging in excess of 5000 h,…