Materials Literature
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Article Observations on the Diatom Genus Donkinia Ralfs in Pritchard II. Frustular Studies and Intraspecific Variation was published on January 1, 1983 in the journal Botanica Marina (volume 26, issue 12).
Reactions photosensibilisees par Ru(bpy) 3 2+ du benzyl-1 dihydro-1,4 nicotinamide avec divers composes carbonyles aromatiques conduisant a des composes d'addition 1:1 de structure nicotinamide substitue en 4. Rendements moderes. Reduction nulle ou faible en alcools correspondants. Avec la carbonyle-2,2'-bis pyridine…
Four families of diatoms, well represented in the ice microflora of Manitounuk Sound, Hudson Bay, are treated. The Entomoneidaceae (Entomoneis, 6 taxa; Plagiotropis, 2 taxa) and the Nitzschiaceae (Nitzschia, 12 taxa) have more representatives than the Cymbellaceae (Amphora, 1 taxon) and the Gomphonemataceae (Gomphonem…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental observation of the tellurium(IV) bonding and lone-pair density in dimethyltellurium dichloride by x-ray diffraction techniquesRonald F. Ziolo and Jan M. TroupCite this: J. Am. Chem. Soc. 1983, 105, 2, 229–235Publication Date (Print):January 1, 1983Publication Hi…
Proprietes, mise en œuvre, applications comme couche barriere dans les films, feuilles, bouteilles, tubes dans l'emballage
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…
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.
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…
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…
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…
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)
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 , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
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…
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…
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…
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…
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…
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…
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…