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Societies and Academies

1935; Nature Portfolio; Volume: 135; Issue: 3421 Linguagem: Inglês

10.1038/135886b0

1476-4687

Advanced Theoretical and Applied Studies in Material Sciences and Geometry

PARIS Academy of Sciences, April 8 (C7.JB., 200, 1257–1372). PAUL LANGEVIN and JACQUES SOLOMON: The laws of the disengagement of electricity by torsion in piezo-electric substances. The general theory of piezo-electricity developed twenty-five years ago by W. Voigt is capable of predicting the phenomenon of strepho-electricity, recently described by Tawil and by Ny Tsi-Ze and Tsien Ling-Chao. The formulæ obtained from Voigt's theory, although differing from those suggested by Tawil and by Ny Tsi-Ze and Tsien Ling-Chao, are in good agreement with their experimental results. RICHARD FOSSE, PAUL EMILE THOMAS and PAUL DE GRAEVE: The action of hydrazine on the cyclic ureides (parabanic acid). GEORGES DARMOIS: The laws of probability with exhaustive estimation. P. VINCENSINI: Ribacour's transformation of Guichard surfaces. A new aspect of Eisenhart's transformation. SERGE ROSSINSKI: The deformation of surfaces with persistent conjugated network. ALFRED ROSENBLATT and STANIS-LAW TURSKI: The coefficients of series of univalent powers in the unit circle. SOLIM MANDELBROJT: A problem of Carleman. ANDRE MAGNIER: The limiting values of harmonic functions. HARALD BOHR: A general theorem of integration of a trigonometric polynomial. L. PONTRJAGIN: The Betti numbers of Lie groups. ELIE CARTAN: Remarks on the preceding communication. SILVIO MINETTI: The trend of a uniform function in the neighbourhood of an isolated essential singular point. ALEXANDRE DUFOUR: A suggestion for an experiment concerning classical kinematics and relativist kinematics. VICTOR VOLKOVISKI: Chains of vortices. CAIUS JACOB: Some properties of the general solution of a problem of H. Villat and R. Thiry. HENRI ABRAHAM: Free electrons in astrophysics. RENE COUDERC and JEAN DANTON: The discovery of a remarkable submarine plateau between Madeira and Portugal. L. GOLD-STEIN: The non-adiabatic character of the variations of nuclear charges. MLLE. MARIE ANTOINETTE BAUDOT: The properties of the (2co) space and their applications. JEAN J. TRILLAT and HANS MOTZ: The formation and structure of monomolecular or bimolecular layers of fatty substances on metallic surfaces. Spectrography with X-rays fails with very thin layers, but utilising electronic analysis of films deposited on a surface of gold, evidence of the structure can be obtained. The electronic analysis of metallic films, originally giving the diagram of the pure metal, shows the presence of fatty layers as impurities after keeping for several months. THEODORE IONESCU and CONSTANTLY MIHTJL: The propagation of electric waves in the earth's magnetic field. A development of the theory of the propagation of electric waves in the ionosphere, taking into account the action of the earth's magnetic field. It is claimed that this modified theory fully explains the experimental results without recourse to the hypothesis that the ionosphere is composed of several ionised layers. ROMOLO DEAGLIO: The interior unipolar conductivity of certain crystals. A. COTTON: Remarks on the preceding communication. The Indian Journal of Physics (March, 1935) contains an article by S. R. Khastgir and Das Gupta describing experiments leading to similar conclusions as those obtained by R. Deaglio. EDGAR PIERRE TAWIL: Considerations on the disengagement of electricity by the torsion of quartz and on the reciprocal phenomenon. The author maintains that strepho-electricity and piezo-electricity are distinct phenomena. GASTON DUPOUY: The experimental properties of paramagnetic substances. Fundamental characters: interpretation. GEORGES LIANDRAT: Concerning the Schottky effect in photo-elements with boundary layer. GEORGES ZIELINSKI: The polarisation of the 2540 A. and 2650 A. fluorescence bands of saturated mercury vapour. MLLE. YVETTE CATJCHOIS: Study of the L spectrum of mercury. ANDRE MICHEL and JACQUES BENARD: The formula of ferromagnetic chromium oxide. The formula CrO2 is attributed to the ferromagnetic oxide: it cannot be obtained pure. MLLE. SUZANNE VEIL: Electrical phenomena connected with diffusing salts meeting in gels. MLLE. NIUTA KLEIN: The variation of the coefficient of expansion of glass with annealing. MARCEL PRETTRE: The function of the surface in certain homogeneous reactions depending on a chain mechanism. Discussion of the causes of the differences observed in homogeneous gas reactions at high temperatures between uncovered walls (glass, silica) and walls covered with a layer of potassium chloride. G. CHAUDRON and R. DANDREs: Contribution to the study of the alloys formed by the aluminium-magnesium solid solution. PIERRE SUE: The physicochemical study of the neutralisation of aqueous solutions of the sodium niobates. LEON PALFRAY and ALFRED LEMAN: The chemical activity of the naphtholic hydrogens of 1, T.dihydroxy-naphthalene. The reactivity of the two hydroxyl groups is of the same order. HENRI LONGCHAMBON: The properties of the Ampandrandava sepiolite. AUGUSTE CHEVALIER, LEONCE JOLEAUD and GEORGES PETIT: The quaternary deposits of the old crater of Pedra de Lume (Sal Island, Cape Verde Archipelago). GEORGES SCHNEIDER: The leakages of hot mineral spring water from the Soufre spring at Aix-les-Bains. ROBERT PERRET: The Adrar des Asger (Sahara). ADOLPHE LEPAPE and GEORGES COLANGE: Apparatus for taking samples and the study of the composition of the air of the stratosphere. Louis EBLE: The annual variation of the terrestrial magnetic field. PAUL BERTRAND, RODOLPHE BOHM and PAUL CORSIN: Discovery of a flora in the Lydian of the Montagne Noire Carboniferous at Saint-Nazaire-de-Ladarez (Herault). M. MASCRE and MLLE. A. ROLLEN: The influence of the tensio-negatlvity on the structure of the plant cell. MLLE. PANCA EFTIMIU: The cell formations contained in the cytoplasm of Bucegia Romanica. V. GREGOIRE: The morphogenetic connexions between the leaf and the stem in the Dicotyledons. Louis HE DIN: Observations on the knots of the vine. BASILE LUYET and RUTH ERNST: The non-existence of the nuclear membrane. HENRI HERMANN, GEORGES MORIN and JOANNY VIAL: The persistence of anaphylactic shock in the dog after removal of the spinal cord. PIERRE NOGUES: The measurement of arterial pressure. J. ANDRE THOMAS: The persistence of the secreting function of the entoblasto-vitellogen cell in the course of its transformations in vitro. The vitellogen macrophage. PAUL WINTREBERT: A new theory of development: physiological epigenesis, or theory of chains of functions. EMILE PILLET: The orientation and pyro-electricity of crystals of ammonium magnesium phosphate in calculus concretions of the kidney and bladder. CHARLES DHER£ and MLLE. ANNE RAFFY: The fluorescence spectra of pheophorbides. PAUL CRISTOL, J. FOURCADE and R. SEIGNEURIN: The existence of a dissociation of urea in dilute solution. The view that urea undergoes dissociation on dilution is supported by measurements of the lowering of the freezing point, the irregularity of the conductivity curves and diminution of the pH. GEORGES SAND OR: The isoionic point of the proteins.