Abstract: Analysis of cobalt contributions to the Faraday rotation spectra in the series of (YCa)3(FeCoGe)5O12 garnet films enabled us to distinguish between single contributions of Co2+ and Co3 ions in tetrahedral sites. It appeared that even the high counterdopes of calcium do not suppress the occurrence of tetrahedral Co2+ ions, although their concentration is greatly reduced in comparison with the original samples not containing any Ca. Noteworthy is also a rather high content of tetrahedral Co3+ in the samples not containing calcium even in cases when Ge content exceeds that of Co ions.

Abstract: Mesures des energies de liaison des electrons des niveaux de cœur et des energies cinetiques des electrons Auger du palladium depose sur des supports de carbone amorphe

Abstract: Calcul de la contribution a l'anisotropie non cubique due a la distribution preferentielle des ions Fe 3+ . Examen particulier des couches minces de grenats contenant des ions Bi 3+ . Etude de quatre mecanismes differents pouvant expliquer les importantes anisotropies non cubiques de ces systemes. La modification de la decomposition en champ nul de Fe 3+ au second ordre induite par Bi 3+ est responsable de cette anisotropie

Abstract: On discute de la contribution de l'interaction spin-orbite a l'amortissement de Landau-Lifshitz-Gilbert en termes de modele de liaisons fortes de Brooks et de l'approximation de Born pour un desordre diagonal de site

Abstract: Article de synthese considerant la theorie vibronique de la ferroelectricite et ses recents developpements

Abstract: Transient absorption of a long lifetime (≧ 20 s) of YAG: Nd is typical of pure material. It is the main reason of thermal deformation of the laser rods accompanied with power decreases at higher CW input. It may be prevented by an admixture of Fe, Ti or Cr. Using a small admixture (≦ 10−3 wt.%) of Ti or Cr the energy transfer among Nd ions and the gain coefficient may be increased. Cr in a higher concentration absorbs the pumping light and serves as earlier described coactivator (sensitizer) only. Fe impurity fully prevents any increase of the gain of YAG: Nd containing Ti or Cr and causes slow but irreversible degradation of the active parameters. Ce favourably modifies properties of YAG: Nd, Cr. YAG: Nd, Cr, Ce free of iron impurity is advisable active material for powerfull CW lasers.

Abstract: The main results of the present paper can be summarized as follows: a) By choosing suitable PbO-B2O3-Bi2O4 melts combined with appropriategrowth conditions it is possible to reduce significantly the content of lead atoms in garnet films leading to the incorporation of approx. 0·1 Pb per one Bi atom (y/x≈ ≈ 0·1). b) Account of the interference of the respective YL γ2,3, BiM α1 and PbM α1, PbM β1 X-ray lines in the EPMA method enables sufficiently exact determinations of Bi and Pb contents in garnet films. c) Determination of Bi contents in thin garnet films (1–2 μm) is made possible by measuring the FR near 500 nm. The magnitude of the minumum of the specific Faraday coefficient determines the Bi content and it has been shown that this value is not influenced by the presence of Pb ions.

Abstract: Evaluation des parametres d'etat supraconducteur c. a d. la force de couplage electron-phonon, le pseudopotentiel de Coulomb, la temperature de transition, l'exposant d'effet isotopique et la force d'interaction effective en employant une forme lineaire du pseudopotentiel electron-ion, proposee recemment par Sharma et Kachhawa

Abstract: We have presented a numerical solution of the electron Boltzmann equation in the two-terms approximation with given cross sections. The computations were performed for the electron gas in the dry air and a comparison with calculations in pure oxygen and nitrogen was made. Within the range of 2×10−17 −4×10−15 Vcm2 of the parameterE/N the mean kinetic energy of electrons, drift velocity, characteristic energy and transverse diffusion coefficient were calculated and compared with the available experimental data. Greater deviations of the electron swarm parameters from their experimental values were found in the dry air than in pure oxygen or nitrogen. We have been unable to identify the cause of these discrepancies, which exceed a likely error incurred by the use of the two-terms approximation [17]. For instance, in the present calculations the maximum deflection of the computedD T /μ from the experimental one in the case of dry air is about two times greater than in pure oxygen or nitrogen.

Abstract: In a short review on SI-GaAs it is not possible to exhaust all problems related to this important material. We have reviewed the present stage of knowledge about the main defects in SI-GaAs which are responsible for semi-insulating properties of this material and we pointed out some problems concerning the determination of carrier densities and mobilities in SI-GaAs in the dark and at low electric fields. Special problems arise when this material is investigated under illumination or at high electric fields due to the generation of nonequilibrium carriers and various trapping and recombination processes.

Abstract: Des structures MIM constituees d'une couche d'α-phtalocyanine sans metal entre deux electrodes d'or sont etudiees sous vide. Quand la lumiere est faiblement absorbee, l'effet photovoltaique resulte entierement du volume, avec un rendement quantique de 1,3%. Quand la lumiere est fortement absorbee, le signe du photocourant suppose la conduction par trous injectes. Des pieges de porteurs distribues non uniformement dans l'espace en concentration elevee sur l'electrode opposee au support agissent sur le champ interne et donc sur la tension en circuit ouvert

Abstract: The general theory of the electromagnetic reflection at an interface between an isotropic ambient and an anisotropic medium developed in sections 2 and 3 was applied to the case of orthorhombic magnetic crystals (section 4). Assuming the magnetization parallel to thec-orthorhombic axis and, at the same time, to the plane of the interface, we have given the solutions for the following special cases: The description includes the magnetooptical longitudinal and transversal Kerr effects. For the other orientations of the orthorhombic axes (and magnetization) the analysis leads to much more complicated expressions. The only exception is the polar case (thec-axis and magnetization oriented normal to the interface) which although included in the theory of sections 2 and 3 as a special case was treated separately [1]. The present analysis was motivated by the recent research in orthoferrites. It extends the previous works summarized in [5] to low symmetry crystals. It allows us among other things to study the effect of induced anisotropies on the magnetooptical properties in a given material. The formulae were obtained with no restrictions on the relative magnitudes of the permittivity tensor elements. Note that even for the cubic magnetic crystals only approximate expressions were available so far [5]. The present analysis allows us to apply the assumptions on tensor elements to the exact end formulae and thus to obtain justified approximate expressions.

Abstract: This paper has explored the influence of an oxygen addition on the dielectric strength of the SF6 by numerically solving the Boltzmann equation with given cross section data. The linear variation of the dielectric strength with a mole fraction of oxygen was obtained. Similar calculations were performed for SF6 + air for which only approximative estimates had existed in the literature. To check the results and for other practical reasons the method of the Boltzmann equation was applied to the SF6 + He and SF6 + N2 mixtures, the dielectric strength of which had already been explored by other authors. In comparison with other mixtures currently studied the SF6 + O2 mixture reveals rather poor dielectric properties. In spite of the fact that the oxygen is an attaching gas, its addition to SF6 and its mixtures spoils the dielectric strength. This numerical analysis exactly qualified this behaviour and it is in agreement with the few available experiments.

Abstract: On propose une modification de la methode de spectroscopie du potentiel d'apparition des electrons Auger. Spectres de l'acier inoxydable et du chrome

Abstract: The conclusions obtained on the basis of experimental results are as follows: 1. The current of free electrons is an important part of the total discharge current in the outer layer of negative corona in air at atmospheric pressure. This conclusion is interesting from the viewpoint of the most part of the known negative corona applications. 2. The primary quenching of the Trichel pulse in air is not the result of negative ion formation, which supports presumptions of the new theory of negative corona formed at present.

Abstract: Calcul du deplacement des couches et de l'orientation des molecules de la phase SmC* pour ces defauts

Abstract: Perhaps once, if all the books except the!Philos.Trans, had been d e s t r o y e d , the f o u n d a t i o n s of p h y s i c s would have remained unshaken / 1 / . Nowadays, b o o k s f o ~ m a c o n s i d e r a b l e f r a c t i o n of the r e s e a r c h and educ a t i o n a l l i t e r a t u r e and one can ask about t h e i r c u r r e n t r i s i b i l i t y . 01d I S I s t u d i e s / 2 , 3 / i n c l u d e d some 30 m o s t c f t e d p h y s i c s books, a few o t h e r s a re i n the l i s t o f eminent p r ~ ~ r y a u t h o r s / 4 / and among c i t a t i o n c l a s s i c s i n phys i c s / 5 / . 0 t he r sou rces p rov ided t h e backbone of the p r e s e n t r e p o r t : b i b l i o g r a p h i e s / 6 8 / , monographs / 9 1 7 / , s o l e n t o m e t r i o s t u d i e s / 1 8 2 1 / , Dutch h i g h l i E h t s / 2 2 / , c o n s u l t a n t s " adv ice / 2 3 / , and ma i n l y , ever r e p e a t e d browsing th rough p r i n t e d volumes of the Science C i t a t i o n Index~ 1965-1983.

Abstract: In this paper further possibilities of extending of the stochastic theory of crystal growth as well as possibilities of solving the basic equations are presented. The building of kinetic processes on the solidification front in the stochastic model gives us the possibility of studying the influence of kinetic processes in connection with temperature distribution during crystal growth.

Abstract: Etude de la thermostatique de materiaux dont l'energie libre et les contraintes a l'equilibre dependent des gradients de deformation. Dans ce cadre on etudie les materiaux de grade r a variables internes

Abstract: The developed version of the augmented plane wave method yields eigenvalues and eigenfunctions with higher accuracy than the standard LAPW, preserving its computational efficiency.