Manufacturing processes and materials for engineers
Manufacturing processes and materials for engineers , Manufacturing processes and materials for engineers , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
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Inducible Degradation of Hydroxyproline in Pseudomonas putida: Pathway Regulation and Hydroxyproline Uptake
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,…
Effect of axial ligands upon the electronic absorption spectrum of phthalocyanineiron(II)
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…
High Rate Anodic Dissolution of Copper
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…
STUDIES ON FLAVINS IN ORGANIC SOLVENTS — III. SPECTRAL BEHAVIOUR OF LUMIFLAVIN
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…
PROPERTIES OF THYMINE DIMERS
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…
Thermal energy scattering of alkali atoms from halogen atoms and molecules: the effect of curve crossing
A semi-classical theory for the effects of curve crossing on the thermal energy differential elastic scattering cross section for alkali-halide and alkali atom-halogen molecule systems is developed. It is shown how in the M-X case the cross section goes over from being determined by the ‘covalent’ potential curve to b…
The location of the inner hydrogen atoms of phthalocyanine: a neutron diffraction study
B. F. Hoskins, S. A. Mason and J. C. B. White, J. Chem. Soc. D, 1969, 554b DOI: 10.1039/C2969000554B
Representation of magnetisation curves over extensive range by rational-fraction approximations
The paper presents a simple mathematical expression which enables representation of all types of magnetisation curves over a very wide range. The equation given is ideally suited for problems which require use of the B/H curve many times, since calculations using it require only a few operations of the basic arithmeti…
An electron resonance study of some low-spin d 5 complexes of second- and third-row transition metals
The e.s.r. spectra of several low-spin d5 complexes of osmium, iridium, and ruthenium have been measured. The results are discussed in terms of ligand field theory and the stereochemistry of the complexes.
Electron-phonon interaction in the modified tight-binding approximation
The electron-phonon interaction matrix element is examined in a modified tight-binding approximation. It is found that the matrix element is proportional to the bandwidth and therefore very small for an extremely narrow band. Paradoxically, in the usual Bloch tight-binding approximation the same matrix element which i…
An Analytical Approach to Ferroresonance
Ferroresonance is defined in a way corresponding to the more general expression "jump resonance." An analytical method called the incremental describing-function method is applied to the problem of ferroresonance in power systems for a certain class of problems. In general, the method is applicable when the conditions…
Electron attachment and compound formation in flames. Part 1.—Electron affinity of BO 2 and heats of formation of alkali metal metaborates
Addition of boron to atmospheric-pressure fuel-rich H2+ N2+ O2 flames seeded with alkali metals results in reductions in concentrations of free alkali metal atoms and in formation of negative boron-containing ions. The following enthalpy changes and equilibrium constants are inferred: Li + HBO2⇌ LiBO2+ H ΔH°0=–21 ± 20…
Dynamics of Displacive-Type Ferroelectrics –Soft Modes–
Dynamical behaviors of the soft mode in displacive-type ferroelectrics such as SrTiO 3 and BaTiO 3 are studied theoretically. (1) It is pointed out from the irreversible thermodynamical view point that the critical slowing-down appears directly through frequency, and not directly through damping as in order-disorder p…
Structural and Electrical Properties of Solid Polymeric Carbon Disulphide
Abstract It is known that liquid CS 2 when subjected to high pressure forms a stable solid polymer. Our studies revealed the existence of two distinct forms designated here A and B. Chemical evidence suggests that type A has the composition CS 2 and contains no free sulphur, while type B does contain free sulphur and…
Thermal Expansion of Sputtered Silicon Nitride Films
Abstract not Available.
Dispersion Relations for Phonons in KCl at 80 and 300°K
Abstract Phonon dispersion relations in KCl at 80°K have been determined using inelastic neutron scattering. The measurements have been performed mainly in the symmetry directions [100], [110], and [111], but also at some other points in the reciprocal space. More than one third of the phonons in all branches were als…
Calotropis‐Glykoside, vermutliche Teilstruktur.. Glykoside und Aglykone, 321. Mitteilung
Abstract Reduction of uscharidin ( 19 ) with NaBH 4 gave a crystalline product C 29 H 42 O 9 which we formulate as β‐tetrahydro‐uscharidin ( 12 ), it was characterised as a crystalline tri‐O‐acetyl‐derivative 14 . The same compound 12 was obtained from calactin ( 18 ) and calotropin ( 18A ), thus confirming earlier re…
Thermal Cycling and Surface Reconstruction in Aluminum Thin Films
The appearance of “annealing hillocks” on heat treated aluminum films has been previously reported. Thin films of Al, deposited on passivated wafers, were annealed for various lengths of time in the temperature range 200°–500°C. The effects of grain size, alloying and surface passivation on hillock formation, were stu…
F Band Absorption in Alkali Halides as a Function of Temperature
Abstract Measurements have been made of the F centre optical absorption function for all twenty alkali halides at seven temperatures between ≈ 5 and 300 °K. The measurements have been fitted with a shape function consisting either of an unsymmetrical Gaussian band or, for the halides of cesium, of three symmetrical Ga…