A Note on Valve Formation and Homology in the Diatom Genus Cymbella
D. G. MANN; A Note on Valve Formation and Homology in the Diatom Genus Cymbella, Annals of Botany, Volume 47, Issue 2, 1 February 1981, Pages 267–269, https://d
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。
Elastic energy dissipation effects in α + β and β phase composition ranges of the palladium-hydrogen system
Elastic energy dissipation (internal friction) peaks, arising from both stress-induced, bulk lattice rearrangements of hydrogen interstitials (H (1) peak) and hydrogen dislocation interactions (H (2) peak), have been investigated over a wide range of the hydrogen content in alpha + beta and beta phase concentration ra…
Redox reactions of copper in zeolite A. Four crystal structures of vacuum-desolvated copper-exchanged zeolite A, Cu8-A
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox reactions of copper in zeolite A. Four crystal structures of vacuum-desolvated copper-exchanged zeolite A, Cu8-AHan Sik Lee and Karl SeffCite this: J. Phys. Chem. 1981, 85, 4, 397–405Publication Date (Print):February 1, 1981Publication History Published online1 May 200…
Theoretical π‐π* circular dichroic spectra of helical poly(glycine) and poly(L‐alanine) as functions of backbone torsion angles
Abstract Circular dichroic spectra and oscillator strengths of the π‐π transition near 190 nm are calculated for helical (Gly) 6 and (Ala) 6 at 30° intervals of the backbone torsion angles (ϕ,ψ) over the range ‐180° ≤ ϕ ≤ ‐60°, −60° ≤ ψ ≤ 180°, using the partially dispersive normal mode treatment of the dipole interac…
Crystal data for ferric molybdate: Fe2(MoO4)3
Indexed powder patterns of the monoclinic phase, stable at room temperature, and of the orthorhombic phase, stable for T > 786 K, are given. The cell dimensions are: a = 15.737 (8), b = 9.231 (5), c = 18.224 (9) Å, β = 125.46 (2)° at 295 K; a = 9.330 (3), b = 12.868 (5), c = 9.242 (3) Å at 818.6 K. Linear equations de…
Redox Potential Measurements in High Temperature Aqueous Systems
Redox potential measurements on platinum and Type 304 stainless steel in equilibrium ( or ) and nonequilibrium boric acid/lithium hydroxide solutions at 275°C are reported. For equilibrium systems containing hydrogen, good agreement was obtained between the measured potentials on platinum and calculated equilibrium po…
The sense of Jahn-Teller distortions in octahedral copper(II) and other transition-metal complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe sense of Jahn-Teller distortions in octahedral copper(II) and other transition-metal complexesMalcolm GerlochCite this: Inorg. Chem. 1981, 20, 2, 638–640Publication Date (Print):February 1, 1981Publication History Published online1 May 2002Published inissue 1 February 19…
Role of molybdenum in phosphorus-induced temper embrittlement of 12%Cr martensitic stainless steel
Molybdenum considerably reduced reversible temper embrittlement (RTE) of 12%Cr martensitic stainless steels by scavenging P in the matrix, which decreased P segregation to the grain boundaries. Contrary to the case of many low-alloy steels, Mo additions as large as 1 wt-% were still beneficial, due to the lower C cont…
Principal magnetic susceptibilities of MnO and their temperature dependence
The temperature dependence of the principal susceptibilities, ${\ensuremath{\chi}}_{\ensuremath{\parallel}}$ and ${\ensuremath{\chi}}_{\ensuremath{\perp}}$, of MnO are reported in the range of 4.2 to 300 K from the studies in a single crystal from which nonstoichiometries have been removed. A procedure combining selec…
A Controlled Composition Study of Calcium Carbonate Crystal Growth: The Influence of Scale Inhibitors
The precipitation of calcium carbonate is of considerable importance in a wide variety of scale forming situations since carbonate concentrations in the environment are usually quite appreciable. As a first-formed solid phase, calcium carbonate may induce the growth of other scale minerals on its surface. Since the so…
Electrical Conductivity Mechanism in Zinc and Copper Substituted Magnetite
Abstract The electrical transport properties in polycrystalline ferrous zinc ferrites, Zn x Fe 3− x O 4 ( x = 0, 0.2, 0.4, 0.6) and ferrous zinc–copper ferrites, Zn x Cu 0.1 Fe 2.9‐ x O 4 ( x = 0, 0.1, 0.2, 0.3, 0.4), are studied by measuring the conductivity and the Seebeck coefficient. The conductivity is shown to a…
The examination of fresh or living plant material in an environmental scanning electron microscope
SUMMARY An environmental scanning electron microscope (ESEM) has been developed which allows the examination of specimens at pressures up to 6 kPa. This new technique has been applied to the examination of live and wet plant specimens. The results are compared with those obtained using similar material that has been d…
Molecular dynamics study of a single polymer chain in solution
We have carried out a computer simulation of the dynamics of a model polymer chain in solution. The polymer is represented by a nonamer linked through bonds which are constrained to be fixed (bead–rod model). All particles are assumed to interact via a Lennard-Jones potential and the simulations have been performed at…
The crystal structure of Benzoic Acid: a redetermination with X-rays at room temperature; a summary of neutron-diffraction work at temperatures down to 5 K
Abstract The crystal structure of benzoic acid, C 6 H 5 CO 2 H, has been redetermined by X-ray diffraction at room temperature. Extensive neutron-diffraction measurements have also been made: by single-crystal methods at room temperature and 130 K; and, at 130 K and 5 K, by powder-profile analysis on C 6 D 5 CO 2 H. T…
Excited-state absorption in the pump region of alexandrite
Excited-state absorption in alexandrite has been measured from 420 to 680 nm by using pulsed flash lamp pumping and a dye laser probe. The excited-state absorption cross section is generally of the same order of magnitude as the ground-state absorption cross section (10−19 cm2) and therefore may represent a large loss…
An overall and detailed kinetic study of the pyrolysis of propane
Abstract Overall and detailed kinetic descriptions of the pyrolysis of C 3 H 8 have been proposed as a result of a turbulent flow reactor investigation in the temperature range of 1110–1235 K and at atmospheric pressure. The overall reaction was described by a first‐order rate expression with an activation energy of 5…
EPR spectroscopic characterization ofGd3+in the monazite-type rare-earth orthophosphates: LaPO4, CePO4, PrPO4, NdPO4, SmPO4, and EuPO4
The mineral monazite, a mixed lanthanide orthophosphate $\mathrm{Ln}\mathrm{P}{\mathrm{O}}_{4}$, is considered as a perfect host for geologic disposal of actinides, rare earths, and possibly other elements formed during nuclear-reactor operation. Synthetic monazite-type orthophosphates of all the elements of the first…
Diesel Particulate Trap Regeneration Techniques
<div class="htmlview paragraph">Diesel engine particulates collected on a trap cause the exhaust back pressure to increase and adversely affect fuel economy and vehicle performance. Therefore, a trap must be periodically regenerated by oxidizing the collected particulates. Several techniques for regenerating a D…
Application of Electron Paramagnetic Resonance and Mössbauer Spectroscopy in the Investigation of Kaolinite-Group Minerals
Abstract Samples of nacrite, dickite, kaolinite, and halloysite were investigated using X-band electron paramagnetic resonance (EPR) and Mössbauer spectroscopy. Fe 3+ gave rise to EPR signals at g ≃ 4 which differed with the individual polytype. Only nacrite had no resonance in this region of the spectrum, but it had…
Divalent lanthanide chemistry. Preparation of some four- and six-coordinate bis[(trimethylsilyl)amido] complexes of europium(II). Crystal structure of bis[bis(trimethylsilyl)amido]bis(1,2-dimethoxyethane)europium(II)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDivalent lanthanide chemistry. Preparation of some four- and six-coordinate bis[(trimethylsilyl)amido] complexes of europium(II). Crystal structure of bis[bis(trimethylsilyl)amido]bis(1,2-dimethoxyethane)europium(II)T. Don Tilley, Allan Zalkin, Richard A. Andersen, and David…