Ethylene vinyl alcohol resins for gas-barrier material
Proprietes, mise en œuvre, applications comme couche barriere dans les films, feuilles, bouteilles, tubes dans l'emballage
Materials Literature
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Les diatomées monoraphidées des îles Kerguelen
Aux îles Kerguelen, les monoraphidées sont représentées par les deux genres, Cocconeis et Achnanthes. 35 taxons ont été inventoriés, dont 2 nouveaux pour la science. La plupart des espèces et des variétés ont été examinées au microscope optique, au microscope électronique à balayage et au microscope électronique à tra…
Study of plasmon structure in XPS spectra of silver and gold
Measurements of the low-energy satellites of the core X-ray photoemission lines of silver and gold are presented. The results are compared with electron energy loss spectra and dielectric measurements. Interpretation of the results on the basis of plasmon excitation is given and compared with earlier interpretations.
Photochemistry and sensitized evolution of hydrogen from water using water-soluble cationic porphyrins. Tetrakis(trimethylaminophenyl)porphyrinatozinc and its free base
Photophysical properties (fluorescence spectra, lifetimes, triplet–triplet absorption spectra, triplet lifetimes and quantum yields) and redox potentials have been measured for the free-base, Zn2+ derivatives of a cationic water-soluble porphyrin, tetrakis(trimethyl-aminophenyl)porphyrin [TAPP(4+)]; the values are sim…
Solid-state properties of materials of the type Cs4MX6(where M = Sn or Pb and X = Cl or Br)
Two new compounds Cs4SnBr6 and Cs4SnCl6 have been prepared and the CsBr–SnBr2 phase diagram is described. Phases of the type Cs4Sn1 –nPbnBr6 –xClx(where n= 0–1, x= 0–6) have been examined by X-ray diffraction, electrical conductivity, Mössbauer spectral, and optical reflectance techniques. The electrical conductivity…
Conduction Processes in Polymers
The electrical conductivity of polymers must be understood in order to improve their performance as electrical insulators. At the present time, there is a need to produce materials with lower conductivity than is currently available without compromising the desirable mechanical properties in order to satisfy the conti…
Breeder reactors: A renewable energy source
Based on a cost analysis of uranium extracted from seawater, it is concluded that the world’s energy requirements for the next 5 billion years can be met by breeder reactors with no price increase due to fuel costs.(AIP)
Phosphorus and Potassium Fertilization of Irrigated Alfalfa on Calcareous Soils: II. Soil Phosphorus Solubility Relationships
Abstract Alfalfa ( Medicago sativa L.) was established at two field locations in Colorado in 1976 and triple superphosphate applied at rates of 25 and 50 kg P/ha annually or 75 kg/ha in a single application at seeding. The initial P applications were incorporated while subsequent applications were topdressed. Soil pro…
Ferrites for inductors and transformers
Ferrites for inductors and transformers , Ferrites for inductors and transformers , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Bubble structures in He+irradiated metals
Transmission electron microscopy is used to investigate the spatial arrangement of gas bubbles produced in the metals, Cu, Ni, Au, stainless steel and Ti irradiated with He+ at temperatures ∼ 300 K. For metals having a high degree of crystalline perfection within grains, a gas bubble superlattice is formed at high He…
Oxidation of Molten Al–Mg Alloys
The oxidation mechanism of molten Al–Mg alloys was studied by means of a thermal balance, X-ray diffraction and EPMA. Oxides produced in the Al–Mg (2–12%) alloys oxidized at 923 K to 1173 K for 10.8 ks (3 h) were MgO or/and MgAl2O4. MgO was produced in an early stage of oxidation, and its amount increased temporarily…
Low Viscous Compounds of Highly Nematic Character
Mixtures of broad nematic temperature ranges that permit acceptably short switching times of electro-optical displays at −40°C can be composed of compounds of relatively low polarity and high transition temperatures from the nematic to the isotropic state (T NI. Structures combining 1,4-phenylene and trans-1,4-cyclohe…
Semiconductor electrodes. 48. Photooxidation of halides and water on n-silicon protected with silicide layers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemiconductor electrodes. 48. Photooxidation of halides and water on n-silicon protected with silicide layersFu Ren F. Fan, R. Gerald Keil, and Allen J. BardCite this: J. Am. Chem. Soc. 1983, 105, 2, 220–224Publication Date (Print):January 1, 1983Publication History Publishe…
Study on Thermal Decomposition of MnO<SUB>2</SUB> and Mn<SUB>2</SUB>O<SUB>3</SUB> by Thermal Analysis
The present paper is concerned with the kinetics of thermal decomposition of manganese oxides and nonstoichiometric compounds formed in these reaction processes, studied by means of the thermal analyses (TG, DTA and DSC) and gas chromatography (GC).The decomposition of MnO2 to Mn2O3 proceeds at about 756 K, and the he…
Experimental studies of helium in metals
A short review is given of recent experimental studies of helium in metals, emphasizing fundamental He behavior at low temperatures (room temperature and below), low He concentrations (∼1 at.% He) and in the absence of radiation induced defects. Some of the main points are: (a) interstitial He is generally locally mob…
Photo-oxidation of metalloporphyrins in aqueous solution
Water-soluble, diamagnetic metalloporphyrins have been prepared which contain either zinc(II), palladium(II) or tin(IV) ions as the central metals and their photophysical properties have been measured in dilute aqueous solution. All the compounds undergo efficient intersystem crossing to form long-lived excited triple…
Engineering with polymers
This book should be of interest to undergraduates and postgraduates in materials engineering.
Examination of biodegradability of poly(ethylene carbonate) and poly(propylene carbonate) in the peritoneal cavity in rats.
The biodegradability of poly (ethylene carbonate) and poly (propylene carbonate), synthesized from carbon dioxide and alkylene epoxides, was investigated. The biodegradation of poly (ethylene carbonate) pellets in the peritoneal cavity in rats was observable 2 d after implantation and was nearly completed within 2 wee…
A spectroscopic investigation of cerium molybdenum oxides
A detailed X-ray photoelectron, i.r., and Raman spectral study has been made of Ce2(MoO4)3 and five novel cerium molybdenum oxides (α- and β-Ce2Mo4O15, β- and γ-Ce2Mo3O13, and Ce8Mo12O49), which are of particular interest as they are closely related to the cerium molybdenum oxide species which are expected to play an…
Creep of Zirconium Alloys in Nuclear Reactors
Description This book is aimed at the practicing engineer who is involved with the design, fabrication of operation of zirconium core components. The Metals Properties Council, as part of its continuing role of collecting, analyzing, and updating materials properties data, has arranged for the preparation of this book…