Materials Literature
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Compounds of the type [Fe3(RCO2)6(OH)2]X,xH2O have been studied by magnetic and Mössbauer methods. All the compounds are high-spin and trinuclear in the solid state with the iron atoms in almost equivalent sites.
The Rogowski and Bruce electrode profiles were designed for use in free-field conditions. A new electrode profile is presented which has been designed to give a uniform field over as large a gap as possible while being used inside a discharge chamber. The departures from uniformity of the electric field have been calc…
The slip geometry in the body-centred cubic compound β′AuZn (CsCl type structure) was determined from two-surface optical microscopy studies of slip traces on single crystals. The slip surface is generally a non-crystallographic or high index {hk >0} plane in the zone of the slip direction ⟨001⟩ and is temperature, st…
Shrinkage isotherms of powder compacts of two soda‐lime glasses were measured in various partial pressures of water vapor. The rate of shrinkage increased with increasing partial pressure of water vapor. Shrinkage isotherms of porous glass of high silica content were also sensitive to the partial pressure of water vap…
Abstract The outline of a high‐pressure advice for gaseous hydrogen as a double piston‐cylinder system is given. Any contact between the gaseous volume and the pressure‐transmitting liquid is avoided. The electrical resistance of Pd and Pd–Au (50 wt%) foils was measured at (25 ± 0.1) °C up to 24000 at of gaseous hydro…
Large reversible photochromic changes were observed in SrTiO3double doped with Mo and either Fe or Ni. The photochromic absorption is induced by irradiation in the vicinity of 4000 Å and decays thermally in minutes or can be bleached to its original state by long wavelength radiation. A model is presented in which a c…
Abstract To obtain more useful information about the effect of the degree of stereoregularity on the motion of the polymer chain, the dielectric and dilatometric measurements were made for a series of stereoregular poly(methyl methacrylates) (PMMA). The α‐ and β‐absorptions were observed in each sample, of which the d…
Precise potential control and measurement have permitted the determination of the primary activation potential, E a , of an Fe‐24% Cr alloy in to within ± 0.5 mv and the determination of the kinetics of passivating film growth at this potential, as well as at other potentials. Small changes in potential give rise to l…
The effect of a series of ternary alloying additions on the galvanic behavior of Al‐Sn base alloys has been investigated. A group of soluble ternary elements including Bi, Zr, Mg, and Ag expands the aluminum lattice, stabilizes the Al‐Sn solid solution and either maintains or enhances the high galvanic currents observ…
Abstract A photoelectric method for the registration of the triboluminescence spectra is described. Using this method the triboluminescence spectra of LiF crystals at destruction in air, vacuum, and in an argon atmosphere are obtained. The experimental study of triboluminescence of some alkali halide crystals have bee…
The nature of freshly prepared and hydrothermally treated anodic alumina films has been studied by infra-red spectroscopy supported by electron microscopy. A comparison of the spectra obtained from freshly prepared specimens and those obtained after evacuation and deuterium exchange respectively, suggests that unseale…
Several parameters controlling the soiling of polyester/cotton fabrics have been assessed. Among those which were found to contribute were hydrophobicity of substrate, fabric construction, fabric finishes, type and concentration of detergents. Laboratory results showed that the body sebum is largely responsible for pi…
Objective estimation of the error (σFmeas) in each structure factor (Fmeas), by a procedure such as that outlined in Acta Cryst. (1964). 17, 1327, allows the indicator \cal uα = [Σ (Δ2Fmeas/σ2Fmeas) ÷ χ2m − n,α]1/2 to be evaluated, where ΔFmeas = |Fmeas| − |Fcalc|, χ2m − n,α is given by the χ2 distribution at the α-si…
The homogeneous thermal decomposition of acetic acid has been studied between 530 and 762° in a flow system. Below 600° dehydration is second-order: k= 109·52 exp(–39,300/RT) l. mole–1sec.–1, but the order falls and the Arrhenius plot curves upwards above this temperature. Above 700°, the process is first-order: k= 10…
Manufacturing processes and materials for engineers , Manufacturing processes and materials for engineers , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Studies in Pseudomonas putida of the inducible degradation of hydroxyproline to alpha-ketoglutarate have indicated that either of the two epimers, hydroxy-l-proline or allohydroxy-d-proline, acts as an inducer of all the pathway enzymes. In a mutant lacking the first enzyme of the sequence, hydroxyproline-2-epimerase,…
The electronic absorption spectra of a series of compounds having the general formula phthalo-cyanineiron(II)(L)2 have been measured in the range 12–35 kK. L represents a ligand at one of the axial positions. In general, the spectra consist of four major bands and several minor ones. The energies of the two bands of h…
The anodic dissolution of copper at current densities of 10–150 A/cm 2 has been studied in neutral and solutions. An experimental flow system has been built which allows electrochemical measurements of the dissolution process to be performed under denned hydrodynamic conditions typical for the technical electrochemica…
Abstract— The absorption and fluorescence emission spectra of lumiflavin have been studied in nonaqueous solvents of different polarity. The corrected emission spectra show apparent mirror symmetry to the longest wavelength absorption maximum. In view of high molar extinction coefficient of the longest wavelength maxi…
Abstract— The photochemical and chemical properties of the four dimers of thymine have been studied. The extinction coefficients, reversal cross‐sections and quantum yields for reversal are presented as a function of wavelength in the range 200–289 nm. At any wavelength, the dimers have different reversal cross‐sectio…