Materials Literature
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Optical absorption bands of electrochemically-colored films of amorphous WO 3 , MoO 3 and Mo c W 1- c O 3 were investigated. The peak photon energy of the bands depends not only on the amount of injected charges but also on the Mo content. In the WO 3 films, the absorption band originates from the intervalence trasfer…
Neidium affine is allogamous and exhibits a form of physiological anisogamy in which the behaviour but not the morphology of the two gametes produced by each gametangium differ: one gamete is active, the other passive. The active gamete moves across to the other gametangium via a narrow fusion canal to effect fertiliz…
ABSTRACT Mitosis and valve morphogenesis in the pennate diatom Achnanthes coarctata (Bréb. in W. Sm.) Grun. are described. After cytokinesis, both daughter nuclei and their microtubule centers (MCs) are found near one side of the cell. Each new tubular silica deposition vesicle (SDV) arises centrally, forming a single…
Abstract The effect of various metal salts as nucleating additives for poly(ethylene terephthalate) (PET) has been investigated. In the case of sodium benzoate and probably for all other effective nucleating additives, the nucleation process can be divided into a “heterogeneous particle nucleation” performed by the un…
Recent literature concerning the dissolution of iron oxide and removal of iron oxide from metal surfaces is reviewed. Studies of electrochemical phenomena and reaction kinetics are discussed. Rate expressions based on this work are critically examined, and mechanisms for the dissolution of free iron oxide and iron oxi…
In order to guarantee the desired invariance properties of bond indices, we show the importance of expliciting the tensor character of the matrices concerned, so as to deal with a contraction in the tensor sense between a covariant index and a contravariant one. A straightforward definition of oxidation numbers is pro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlloy cluster beams: nickel/chromium and nickel/aluminumE. A. Rohlfing, D. M. Cox, R. Petkovic-Luton, and A. KaldorCite this: J. Phys. Chem. 1984, 88, 25, 6227–6231Publication Date (Print):December 1, 1984Publication History Published online1 May 2002Published inissue 1 Dece…
Abstract To understand and predict the effects of a thermal pulse induced by a radioactive waste repository on clinoptilolite-bearing rocks, the lattice parameters of 6 natural and 3 cation-exchanged (Ca, K, Na) clinoptilolites were studied as a function of temperature. The samples were examined at room temperature, u…
Crevice corrosion studies were conducted on AISI 304, AISI 316L, and UHB 904L stainless steels using Teflon/metal crevices exposed to aqueous solutions of 1M NaCl and 1M NaCl + 0.01 M Na2S2O3. Tests were conducted at 22 C, except for some additional tests at 55 C on the more crevice resistant 904L. Crevice potentials…
We present a study on single-chain relaxation of linear polymers covering the full concentration range from dilute solution to the melt. Assuming incomplete screening of the hydrodynamic interaction between different segments of a chain, we introduce a phenomenological theory of chain dynamics in semidilute and concen…
The proton spin-relaxation times ${T}_{1}$ and ${T}_{2}$ in the continuous, nonstoichiometric, single-phase hydrides $\mathrm{Zr}{\mathrm{V}}_{2}{\mathrm{H}}_{x}$ and $\mathrm{Hf}{\mathrm{V}}_{2}{\mathrm{H}}_{x}$ ($0.25\ensuremath{\le}x\ensuremath{\le}4.2$) were measured in the temperature range $100 \mathrm{K}\ensure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIron(III)-catalyzed oxygenation of catechols. Structure of (nitrilotriacetato)(3,5-di-tert-butylcatecholato)ferrate(III) dianionL. S. White, P. V. Nilsson, L. H. Pignolet, and L. Que Jr.Cite this: J. Am. Chem. Soc. 1984, 106, 26, 8312–8313Publication Date (Print):December 1,…
Abstract The elastic backscattering probability P e of electrons is proportional to the product of the inelastic mean free path (IMFP), effective backscattering cross section (σ eff ), and atomic density ( N ). Thus, experimental evaluation of P e , e.g. from the elastic peak intensity measurements, enables the determ…
For genetic parameters herd lives of 587,013 Holstein cows recorded in Dairy Herd Improvement were analyzed by paternal half-sister analysis and Cox regression models. Length of life was duration in days between birth and failure or censoring. Failure was defined in two ways; first was death or sale for beef as determ…
XANES (X-ray absorption near-edge structure) spectra of divalent lead compounds have been studied at both the Pb LIII and LI edges using synchrotron x rays from CHESS (Cornell High Energy Synchrotron Source). The combined LIII and LI near-edge spectral features strongly support a sp3d2 hybridization scheme in covalent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn experimental study of hypervalent molecular clusters by neutralized ion beam spectroscopy: ammonium-ammonia (NH4(NH3)n) and deuterated ammonium-ammonia (ND4(ND3)n)Gregory I. Gellene and Richard F. PorterCite this: J. Phys. Chem. 1984, 88, 26, 6680–6684Publication Date (Pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTime-resolved light scattering studies on the kinetics of phase separation and phase dissolution of polymer blends. 2. Phase separation of ternary mixtures of polymer A, polymer B, and solventTakeji Hashimoto, Kouji Sasaki, and Hiromichi KawaiCite this: Macromolecules 1984,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature dependence of neutron scattering behavior and resultant thermodynamics of mixing of poly(2,6-dimethyl-1,4-phenylene oxide) in polystyreneAnn Maconnachie, Roger P. Kambour, Dwain M. White, Shamsedin Rostami, and David J. WalshCite this: Macromolecules 1984, 17, 12…
Diatoms are present within the Eocene to Holocene sediments recovered during Deep Sea Drilling Project (DSDP) Leg 81. A late Cenozoic, North Atlantic diatom zonation is developed as a result of the occurrence of common wellpreserved diatoms within middle Miocene to Holocene sediments. This high-latitude diatom zonatio…
The conductivity of the linear-chain molecular-metal phthalocyanatonickel(II)iodide [Ni(pc)I] remains metallic down to \ensuremath{\sim}30 K, goes through a weak maximum, and then levels off to a high asymptotic ($T\ensuremath{\rightarrow}0$) value that varies from \textonehalf{} to 2 times the value at room temperatu…