Materials Literature
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Leakage currents in new and degraded (typically at twice rated voltage, 125°C) ZSU and X7R types Of multilayer ceramic (MLC) capacitors show both ohmic and space charge limited current behavior. The near 3/2 power voltage characteristic (la V3/2) of new devices can be attributed to electron emission from electrode poi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNegative activation energies and curved Arrhenius plots. 3. Hydroxyl + nitric acid and hydroxyl + peroxynitric acidJohn J. Lamb, Michael Mozurkewich, and Sidney W. BensonCite this: J. Phys. Chem. 1984, 88, 25, 6441–6448Publication Date (Print):December 1, 1984Publication His…
Fibroin is normally composed of one H chain (350 kd) and one L chain (25 kd) which are connected by disulfide bond(s). However, the small amount of fibroin secreted into the lumen of the posterior silk gland of the Nd(2) (naked pupa) mutant does not contain L chain, although L chain mRNA is present and L chain is synt…
Abstract A self‐seeding technique, coupled with isothermal crystallization, was used to prepare isotactic polypropylene specimens of varying spherulite size, but of constant crystallinity and lamellar thickness. The latter quantities were also varied by changing the isothermal crystallization temperature. The electric…
The bidirectional hydrogenase from Clostridium pasteurianum W5 is an iron-sulfur protein containing approximately 12 Fe atoms and 12 labile sulfides. We have studied oxidized samples of the enzyme with Mössbauer and electron nuclear double resonance (ENDOR) spectroscopy to elucidate the nature of the center that gives…
A root-finding algorithm for the solution of the eigenvalue equation linked with the theoretical study of lossy lamellar gratings is outlined. The computation time seems to be shorter than required when using a method proposed by Botten et al. (1981). The agreement is found to be excellent.
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The a.c. conductivity of binary V2O5-P2O5 glasses containing 40, 50, 60 and 70mol% V2O5 has been measured at temperatures between 100 and 423 K, and for frequencies up to 100 MHz. The results are interpreted in terms of Long's polaron hopping model. The polaron parameters calculated from the above model appear reasona…
Abstract It is proposed that titanium‐derived coupling agents react with free protons at the inorganic interface to form organic monomolecular layers on the inorganic surface, which causes inorganic/organic phase compatibilization resulting in new composite property, catalysis, adhesion, and rheology performance stand…
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…