The mechanical properties of bivalve (Mollusca) shell structures
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Mechanism of epoxidation of olefins by covalent peroxides of molybdenum(VI)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of epoxidation of olefins by covalent peroxides of molybdenum(VI)K. B. Sharpless, J. M. Townsend, and D. R. WilliamsCite this: J. Am. Chem. Soc. 1972, 94, 1, 295–296Publication Date (Print):January 1, 1972Publication History Published online1 May 2002Published inis…
Stability of aqueous films on hydrophobic methylated silica
Experiments in which a small gas bubble was slowly advanced towards a polished silica plate under dilute aqueous solutions have shown that “thick” equilibrium films are formed not only on clean, hydrophilic, silica, but also on methylated, hydrophobic, silica. The latter films are metastable, collapsing when disturbed…
Dynamics of pH in Controlled Stirred Tank Reactor
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamics of pH in Controlled Stirred Tank ReactorT. J. McAvoy, E. Hsu, and S. LowenthalCite this: Ind. Eng. Chem. Process Des. Dev. 1972, 11, 1, 68–70Publication Date (Print):January 1, 1972Publication History Published online1 May 2002Published inissue 1 January 1972https:/…
Electrical conductivity by the bis(1,3-dithiole)-bis(1,3-dithiolium) system
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrical conductivity by the bis(1,3-dithiole)-bis(1,3-dithiolium) systemFred Wudl, Darold Wobschall, and Earl J. HufnagelCite this: J. Am. Chem. Soc. 1972, 94, 2, 670–672Publication Date (Print):January 1, 1972Publication History Published online1 May 2002Published inissu…
Grain Growth and Stress Relief in Thin Films
The effect of grain growth on stresses in films is discussed. Grain growth generally leads to stress relaxation when the film is under a compressive stress. When the initial grain size is below a critical value, grain growth can occur by normal boundary migration and generates a tensile stress in the plane of the film…
Multiple scattering theory in condensed materials
Second-order elliptic differential equations (such as the time-independent single particle Schrödinger equation) may be solved in a finite closed disjoint region of space independently of the rest of space. The solution in all space may then be determined by solving the equations in the exterior region together with b…
Non-singular disclinations of strength S = + 1 in nematics
It is shown that the energy of a screw disclination of strength + 1 [1] (2 π rotation of the director around the line) is reduced if the molecules are allowed to relax out of the plane perpendicular to the line. This solution has no singularity on the axis, r = 0. The calculation is done in the case of the anisotropic…
II. Photochemistry of azobenzene and its derivatives
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Double Layer Capacitance of Iron and Corrosion Inhibition with Polymethylene Diamines
The effect of α,ω‐polymethylenediamines NH 2 ‐ ( CH 2 ) n ‐ NH 2 ( n = 2 – 12 ) on the corrosion of iron in deaerated 6 N HCl at 25 ° was investigated by polarization measurements and colorimetric analysis of solution. The adsorption of these inhibitors at the metal/solution interface was monitored by measurement of t…
Electronic spectra, photochemistry, and autoxidation mechanism of the sulfite-bisulfite-pyrosulfite systems. SO2-, SO3-, SO4-, and SO5- radicals
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic spectra, photochemistry, and autoxidation mechanism of the sulfite-bisulfite-pyrosulfite systems. SO2-, SO3-, SO4-, and SO5- radicalsE. Hayon, A. Treinin, and J. WilfCite this: J. Am. Chem. Soc. 1972, 94, 1, 47–57Publication Date (Print):January 1, 1972Publication…
Penetration and energy-loss theory of electrons in solid targets
Starting from a simple atomic model giving the potential between electrons and atoms as V ( r ) = Ze 2 a s −1 / sr s with the empirical value s =fraction six-fifths, we combine the diffusion effect due to multiple collisions and the energy retardation in accordance with a modified Thomson-Whiddington law, with the sca…
Thermally assisted tunnelling and pseudointrinsic conduction: two mechanisms to explain the Meyer-Neldel rule
Two general explanations for the Meyer-Neldel rule are described. The required correlation between the activation energy and pre-exponential factor for conductivity is shown to result by considering (i) a rectifying layer at the electrode-solid interface which produces a field dependent potential barrier through which…
The radiation-induced increase of thermoluminescence sensitivity of the dosimetry phosphor LiF(TLD-100)
Thermoluminescence (TL) and optical absorption measurements on LiF(TLD-100) show that the radiation- induced increase of TL sensitivity of this phosphor occurs in the luminescence process. New data are presented on thermally stimulated exoelectron emission (TSEE), photoluminescence (PL) and radioluminescence (RL). The…
The radiation-induced increase of the 100 C thermoluminescence sensitivity of fired quartz
The 100 degrees C thermoluminescence (TL) sensitivity of fired quartz is increased greatly by beta irradiation and subsequent heating (eg by an order of magnitude following a 1 krad dose and heating to 500 degrees C). Its radioluminescence response increases similarly, implying that the increase of TL sensitivity aris…
The magnetostriction of nickel
Abstract The five magnetostriction constants h1 to h5 have been determined for nickel at 4.2, 77 and 300 K from independent measurements on two crystals. At 4.2 K, h3, h4 and h5 are all small compared with h1 and h2 and there is nothing to suggest that a five-constant equation inadequately represents the magnetostrict…
Optical Evidence for a Network of Cracklike Voids in Amorphous Germanium
The electrodynamic phenomenon of void resonance is used to interpret anomalous structure reported by Donovan and co-workers in the uv dielectric constants of evaporated amorphous germanium. The resulting void parameters are consistent with the existence of a connected network of microcracks perhaps 6 \AA{} in width, s…
Classical Transport in Disordered Media: Scaling and Effective-Medium Theories
Electrical conduction in resistor networks with all but a fraction $p$ of the resistors removed is studied as a paradigm of classical transport in disordered materials. A self-consistent effective-medium theory provides a quantitative description of the model, except in a small critical region, where the scaling law $…
A new concept on the shape memory effect in metals and alloys
The shape memory effect is investigated on many kinds of materials undergoing the martensite transformation. The present experiment proves that such metals and alloys as Co, Ti, Zr, CoNi, CuAl, FeNi and InTl exhibit the shape memory effect. From these results and considerations on the plastic deformation of materi…
Tracer diffusion in the chromium–nickel system
Self diffusion of Cr51 in pure chromium, Cr + 20 wt% Ni, Cr + 44 wt% Ni, and Cr + + 65 wt% Ni has been measured over the temperature ranges of 1000 to 1900, 1000 to 1525, and 900 to 1350 °C, respectively. Over the temperature range of 1000 to 1750 °C the Arrhenius plot for the self diffusion of Cr51 in pure Cr is line…