DIATOMS OF OREGON CAVES NATIONAL MONUMENT, OREGON
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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。
The crystal structure of 6 Ca2SiO4·1 Ca3(PO4)2
Abstract Single crystals of the composition 6 Ca 2 SiO 4 · 1 Ca 3 (PO 4 ) 2 have been grown by the Verneuil-method. The crystals represent a structure derivative of α′ -Ca 2 SiO 4 . Due to twinning of the crystals a structure determination was possible only on the basis of the weak superlattice reflections [ Pnm 2 1 ;…
Topochemically controlled hydrogen reduction of scheelite-related rare-earth metal molybdates
Scheelite-related α-Ln2Mo3O12(Ln = La, Pr, Nd, Sm, Gd, Tb, or Dy) oxides are reduced by hydrogen at 780–870 K yielding molybdenum (IV) oxides of formula Ln2Mo3O9. The latter crystallize in a tetragonal scheelite (ABO4) type structure where one third of the A sites and a quarter of the anion sites are vacant: Ln2/3(□ca…
Study of the valence-electronic structure of UF4, ThF4, UCl4 and ThCl4 in the gas phase and in the solid state
The valence-electronic structure of the actinide halides UF4, ThF4, UCl4 and ThCl4 has been studied by photoelectron spectroscopy in the gas phase using He II radiation and in the solid state using Al Kα radiation. These investigations show that both in the solid state and in the gas phase the electronic structures of…
Interaction of alcohols with evaporated metal films. Part 1.—Adsorption and decomposition of methanol on metal films of nickel, palladium and aluminium
The interaction of methanol with clean and oxidized films of Ni, Pd and Al has been investigated in the temperature range 223–450 K. Dissociative adsorption of methanol on the clean films occurred even at 223 K. A substantial fraction of the adsorption on oxidized Al film at 223 K was reversible. Further extensive ads…
Air Effects on the External SGEMP Response of a Cylinder
Effects of air on the external SGEMP response of a cylinder in the x-ray deposition region (50 to 100 km) are examined. The gross external response of a missile is modeled using an object exposed to a variety of x-ray and air environments. Responses are computed using a macroparticle treatment for both primary and sec…
Vapor pressures of bromine-quaternary ammonium salt complexes for zinc-bromine battery applications
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVapor pressures of bromine-quaternary ammonium salt complexes for zinc-bromine battery applicationsSatya N. BajpaiCite this: J. Chem. Eng. Data 1981, 26, 1, 2–4Publication Date (Print):January 1, 1981Publication History Published online1 May 2002Published inissue 1 January 1…
Archaeothermometry of kaolinitic clays
5 argiles kaolinitiques du Westerwald ont été cuites à différentes températures entre 500 - 1200°C. Les changements minéralogiques ne sont pas très utiles pour des questions d'archéothermométrie dans l'intervalle 600 - 1000°C, sauf si une illite 2 M est présente, dont certains rapports permettent une estimation de la…
New furoxan chemistry. 1. Synthesis of diacylfuroxans by reaction of ethynyl acetates with nitrosyl fluoride nitrosonium tetrafluoroborate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew furoxan chemistry. 1. Synthesis of diacylfuroxans by reaction of ethynyl acetates with nitrosyl fluoride nitrosonium tetrafluoroborateDavid R. Brittelli and George A. Boswell Jr.Cite this: J. Org. Chem. 1981, 46, 2, 312–315Publication Date (Print):January 1, 1981Publicat…
A method of density determination for gravity correction.
A Bouguer anomaly value B is evaluated from a measured gravity value gobs through the formula B=gobs-+FC-BC+TC, (1) where is the normal gravity value, FC the free air reduction, BC the Bouguer correction and TC the terrain correction. The evaluation of (1) requires knowledges of station height h and terrain density 0…
Mixed Cross-Link Systems in Elastomers
Rubbers are long-chain molecules which are plastic in nature in the raw or unvulcanized state. Vulcanization is an irreversible process by which the predominantly plastic rubber is converted to predominantly elastic and a three-dimensional network structure through the anchoring between two polymer chains. Chemically,…
Dissociation energies of the molecules CrPO2(g) and CrO(g) by high-temperature mass spectrometry
The gaseous molecule CrPO2 has been investigated in the course of a high-temperature mass-spectrometric Knudsen-cell study of the vapours over an europium–chromium–phosphorus–oxygen system. From the enthalpy of the equilibrium reaction CrPO2(g)= CrO(g)+PO(g) and appropriate ancillary data, the atomization energy of th…
Precipitation Behavior of σ Phase in a Duplex Phase Stainless Steel
Precipitation of σ phase in an Fe-25Cr-7Ni-3Mo alloy with a duplex structure of α and γ phases, has been studied systematically by means of optical microscopy, X-ray diffraction, hardness measurement, tensile test, SEM observation and dilatometric measurement. The results obtained in this study are as follows: (1) TTT…
Superconductivity of NbSe3
We report measurements of the resistive superconducting transitions of NbSe3 as a function of magnetic field for sufficient pressures to destroy the lower CDW. These indicate that NbSe3 is a bulk anisotropic superconductor with a total Meissner effect. The critical field anisotropies are well described by an effective…
Use of electrochemical methods to determine chemical-diffusion coefficients in alloys: application to ‘LiAI’
The use of electrochemical techniques to measure chemical-diffusion coefficients in solid alloys is reviewed. The theoretical basis and experimental aspects of four different approaches are discussed in detail: the potentiostatic, galvanostatic, potentiometric, and steady- state ac methods. As an example, all four of…
Infrared spectra of natural zeolites of the stilbite group
The infrared absorption spectra of natural zeolites of the 7th structural group: heulandite, clinoptilolite, brewsterite, and stilbite were measured. The spectra were taken in the wavenumber region 200—4000 cm by the KBr technique (1 :40). The number and symmetry of individual vibrations were ascertained by theoretica…
2—THE MOISTURE-VAPOUR PERMEABILITY OF TEXTILE FABRICS
The current ‘dish’ techniques for measuring the moisture-vapour permeability of textile fabrics are slow and tedious. A new approach, based on the measurement of the relative-humidity gradient in a closed linear system, is described. This Resistance Tube provides results that are equivalent to those of the dish techni…
The efficiency of photoluminescence of thin epitaxial semiconductors
General theoretical expressions appropriate to calculating the internal and external quantum efficiency of photoluminescence (PL) are derived for a semiconductor of thickness d and bounded by two surfaces with different surface-recombination velocities. The external efficiency expected from thin and thick layers is co…
Perfluoro effects in 15N nuclear magnetic resonance spectroscopy. Part 1. Aryl and N-heteroaryl azides
15 N N.m.r. spectroscopic results are reported for a range of covalent azides RNαNβNγ(where R is perfluoroaryl, perfluoro- or chlorofluoro-pyridyl or -pyrimidinyl, or trimethylsilyl), and compared with literature values for related azides. The Nα and Nγ chemical shifts vary over a range of 80–100 p.p.m., and correlate…
Giant Raman scattering of light by molecules adsorbed on the surface of a metal
Рффект гигантского комбинационного рассеяния света молекулами, адсорбированными РЅР° поверхности металла, Емельянов Р’.Р