Formation of amino acids by the photochemical method using various carbon-containing substances in presence of nickel as catalyst

Summary In the course of artificial irradiation of sterile aqueous solutions of various organic compounds with a 1000-W electric lamp for 1200 hours in presence of nickel chloride as catalyst, various amino acids, whose nature depends on the nature of the carbon-containing substances, are formed in the solution.     

Combined free and forced convection effects on the magnetohydrodynamic flow through a porous channel

The combined effect of free and forced convection on the flow of an electrically conducting liquid between two horizontal parallel porous walls has been studied. There is a transverse magnetic field at the walls. The equations of motion and energy have been solved by a small perturbation method. The flow phenomenon has been characterized by the non-dimensional numbers like R (cross-flow Reynolds number), K (Brinkman number), G (Grashof number), M (magnetic number) and the effects of these numbers on the velocity and temperature fields, induced magnetic field, electric field and shearing stress at the walls have been studied.     

Atom-atom interaction model and internal vibrational exciton splittings in organic charge-transfer complexes: Factor group splittings of naphthalene vibrations in several crystalline complexes

Factor group splittings of naphthalene vibrations are experimentally investigated for naphthalene: 2SbCl₃ (C₁₀H₈ - 2SbCl₃), naphthalene: octafluoronaphthalene (C₁₀H₈ : C₁₀F₈), naphthalene: TCNB, and naphthalene: TNB crystalline complexes by Raman spectroscopy and using the isotopically mixed crystal technique. It is found that only 386 cm^?1 mode of C₁₀H₈ shows factor group splittings in the first two complexes. The splitting increases from 5 cm^?1 in pure C₁₀H₈ crystal to 5.5cm^?1 in C₁₀H₈ : 2SbCl₃ but decreases to 1cm^?1 in the C₁₀H₈ : C₁₀F₈ complex. Also as SbCl₃ is successively replaced by SbBr₃ in the complex C₁₀H₈ : 2SbCl₃, the factor group splitting of 386 cm^?1 C₁₀H₈ mode decreases and the mean of the factor group frequencies goes through a minimum near 0.5 mole fraction of SbBr₃. A theoretical calculation using atom-atom potential model and considering only naphthalene-naphthalene interactions predicts that the factor group splitting on 386 cm^?1 band should increase from pure C₁₀H₈ crystal to the C₁₀H₈ :2SbCl₃ crystalline complex and decrease in C₁₀H₈ : C₁₀F₈. However, the calculation also predicts a similar trend for 943 cm^?1 band of naphthalene which shows a factor group splitting of 5 cm^?1 in pure C₁₀H₈ but none in the C₁₀H₈ : 2SbCl₃ complex. Furthermore, the atom-atom interaction model does not explain the effect of SbBr₃ substitution on the factor group splitting. The importance of electrostatic multipole interactions in explaining the behavior of factor group splitting is discussed.     

Axisymmetric shrink fit problems of the elastic cylinder of finite length

The general case of the axisymmetric shrink fit problems of a solid elastic cylinder whose ends are free from tractions is formulated in terms of the Fredholm integral equation of the second kind. This is accomplished by the use of Papkovich-Fadle eigenfunction and the calculus of residues. Indentation by three types of sleeve is considered; (i) Edge Sleeve, (ii) Symmetrical central Sleeve and, (iii) Two identical edge sleeves. For each case, numerical results of effective resistance and contact pressure are reported for various values of the Poisson's ratio, radius of the cylinder and the sleeve width.

---

Zusammenfassung Der allgemeingültige Fall achsensymmetrischer Schrumpf-Anpassungs probleme eines elastischen Festzylinders dessen Enden zugkraftfrei sind wird in der Form der zweiten Integral-gleichung von Fredholm ausgedrückt. Dies wird durch die Anwendung der Papkovich-Fadle Eigenfunktion und der Residuenrechung erreicht. Drei Arten von Manteleinkerbungen werden untersucht: (i) einseitige Endeinkerbung, (ii) symmetrische Zentraleinkerbung, (iii) zweiseitige Endeinkerbung. Für jeden Testfall werden die Zahlenergbnisse des effektiven Winderstandes und des Berührungsdruckes für verschieden Werter der Poisson Ratio, des Zylinderradius und der Mantelkerbweite berichtet.

---

---

The present results were obtained in the course of research supported by NSF Grand GK-25604.     

A Kerr effect study of microwave behaviour of partially magnetised ferrites

Magneto-microwave Kerr effect has been experimentally studied on three ferrite samples in the Polder-Smit loss region. Experimental data have been compared with the theoretical values which were calculated on the basis that the real part of the permeability tensor element μ′ is given by Green and Sandy's expressions (IEEE Trans. Microwave Theory Tech. MTT-22, 641 (1974)). This has a term given by Schlomann for μ′₀, the permeability for the demagnetised state. No agreement is found between theoretical and experimental values hence the above expression for ν′₀ has been substituted by another one given by Sandy (Raytheon Tech. Memor. T-815 (1969)) which involves the average demagnetisation factor N. It is found that there is a good agreement between the theory and the experiment provided N is assumed to depend linearly on the magnetisation of the sample.     

Pfropfung von Acryls?ure auf Methyleellulose

Ohne Zusammenfassung     

Magneto-microwave Kerr effect in high conductivity Mn-Zn ferrites

Magneto-microwave Kerr effect has been studied both theoretically and experimentally on two samples of high conductivity Mn-Zn ferrites for one of which ($\text{λ4πM}{}_{\mathrm{s}}\text{ω}$) was greater and for another less than unity. The experimental measurements have been made with the help of a microwave interferometer. The technique is useful for determination of effective FMR linewidth in samples of larger dimensions. It is found that Rado's theory is unable to interpret these results for any of the samples, while Green and Sandy's phenomenological theory is able to do so for the sample to which it is applicable, viz. the one with $\text{λ4πM}{}_{\mathrm{s}}\text{ω}\text{< 1}$.     

Investigation of secondary flow on an infinite yawed cylinder with 15 per cent. Thick Joukowski profile as section

This paper contains a theoretical investigation of the secondary flow in the laminar incompressible boundary layer on an infinite yawed cylinder with chordwise section as Joukowski profile of 15 per cent. thickness at zero incidence and with homogeneous suction, the suction mass flow coefficient being equal to 0·2085. The secondary flow profiles are obtained at different points of the wing section and for various angles of sweepback. It is found that in favourable pressure gradients and at pressure minimum, the secondary flow profiles have negative values. In regions of adverse pressure gradients after the pressure minimum the secondary flow changes sign from negative to positive values and have points of inflexion. The change of sign starts from the surface and extends to the edge of the boundary layer downstream. At some points in adverse pressure gradients the secondary flow profiles have double points of inflexion and values of both signs simultaneously. It is also found that an adverse pressure gradient produces more powerful secondary flow than a favourable pressure gradient of the same strength.     

Phase transition in potassium lithium sulphate

Phase transition and lattice parameter variation with temperature of potassium lithium sulphate have been studied. Precision lattice parameters have been determined at various temperatures, ranging 30°C to 400°C. The diffraction pattern obtained above 435°C differs from that taken at room temperature suggesting a structural change, contrary to the reports of Fischmeister and others. Presented at the Symposium on Crystallography and Crystal Physics, Osmania University, Hyderabad, December 1977.