By mean of a graphical method developed in our Laboratory, we studied linearity of response of the MS 7 mass spectrometer for impurity determinations over a concentration range of 1 to 1000 ppm (parts per million of atoms). This method consist in transfor...
National Technical Information Service (NTIS)
'energie par : Au zero de temperature absolue, on suppose que : qui correspond au cas ou le spectre d'6nergie temperature abso- lue T est non nulle, et ou p(w) correspond au spectre de Planck. Dans ce dernier cas, 1 mesures spectrales au lieu de densites, et mettre en evidence le role joue par les 2 nappes du cone d
E-print Network
The density of neutrons in a standard pile was determined between the zero-energy and the cut-off energy of 1 mm thick cadmium unit using a gold detector. Its absolute activity was measured using a 4 pi beta counter calibrated for 4 pi beta, gamma coincid...
La mont�e en puissance des lasers solides est fondamentalement limit�e par des probl�mes thermiques, qui d�coulent de la transformation d'une partie de l'�nergie de pompe en chaleur. Nous pr�sentons ici une m�thode simple pour mesurer directement la temp�rature absolue � la surface d'un cristal, lorsqu'il est pomp� longitudinalement ...
NASA Astrophysics Data System (ADS)
plans for the post-launch calibration campaign are presented. INTRODUCTION ... bias errcns affect NSCAT performance: absolu(e bias and beam-to-beam bias. ... COMPASS simulation.2 In order to meet the aggressive NSCAT ...
NASA Website
Le P�le de METROLOGIE de SOLEIL a pour objet de cr�er sur le synchrotron SOLEIL, une plateforme constitu�e : - une ligne de lumi�re utilisant le rayonnement synchrotron (m�trologie dite � la longueur d'onde) - d'un laboratoire de m�trologie associ� (m�trologie dite ll classique gg ) Ces deux types de M�trologie sont l'une et l'autre indispensables pour soutenir l'activit� de ...
This paper deals with the diffraction of a plane electromagnetic wave by metallic gratings. Some calculations have already been achieved on an UNIVAC 1110 computer in both ultraviolet and visible regions.
There are several processes involved in ion beam mixing: ballistic processes, chemical driving forces and radiation enhanced diffusion. Experiments usually performed on bilayers irradiated with heavy elements and characterized by Rutherford backscattering...
By radioactivation analysis, we measured quantitatively for the first time the elementary transformation of coral in vivo. Some natural coral was implanted after having been sterilized in ovine jaws. Every month, biopsies were extracted in order to get a ...
The crystal and molecular structure of para-toluidine was solved by X-ray and neutron diffraction counter techniques. The molecules are arranged in the form of infinite chains in the crystal, each molecule being linked to two neighbours by hydrogen bonds....
Photoelectron diffraction at low and high kinetic energies was used to study the cristalline structures of clean single crystal surfaces. W(110) was studied at low electron kinetic energies (
Since the inception of the activated sludge process, operating problems have been associated with the growth of excessive numbers of filamentous organisms in the sludge. Since separation of the activated sludge from the effluent by sedimentation is absolu...
�tudes pr�c�- dentes faites l'une sur un monocristal aux rayons X et l'autre par diffraction neutronique modele d'oscillateur anharmonique. On pourrait v6rifier par une simple experience. Avez-vous fait un dia- gramme a tr�s basse temperature ? Dr LOOPSTRA. - Non. Dr. HOLTZBERG. - Avez-vous fait des mesures de
Inorganic chemical composition of coral implanted in vivo is studied by neutron activation. Ca, P, Sr and Mg are determined for various implantation time (1 to 24 weeks), after a latent period of one week calcium content of coral increase up to 6 weeks to...
The influence of conductive materials (such as carbon composite materials) in the propagation of electromagnetic perturbations into aircraft is studied. The method of moments (in frequency domain) is used to calculate the current distribution on a three d...
L-761 Synchrotron X-ray diffraction study of the room temperature incommensurate phase in graphite-bromine- bromine en second stade � temp�rature ambiante. Le compos� graphite-brome a �t� pr�par� � partir d- perature incommensurate phase in stage-2 graphite-bromine prepared with single crystal graphite in bromine
A new method to investigate the diffraction of an electromagnetic wave by an infinite cylinder of arbitrary cross section, made with a dielectric or conductor material, is given. This method leads to a Fredholm integral equation. Some computation has already been achieved on the UNIVAC 1106 computer, they are in good agreement with the conservation of energy.
En commen�ant par l'�tude par diffraction neutronique de la structure des liquides mol�culaires puis de l'hydratation des ions en solution, ce cours montrera comment les principes pr�sent�s lors des cours pr�c�dents peuvent �tre appliqu�s � des syst�mes aqueux. Des exemples tir�s de la litt�rature seront ...
The connection between local and global stability properties of free shear flows was investigated. For 2-D inviscid jets, absolute instability was found for ratios of jet to ambient density below 0.9. Low wake heating (density) eliminates all local absolu...
Microwave measurements of scattering by a helix made from an acrylic rod are reported. All measurement results on extinction (0 = 0 deg) and angular scattering (10 deg less than or equal to theta (10 deg) less than or equal to 170 deg) are given in absolu...
.3.2 Wurtzite (Ga,Mn)N............................................................................49 3.4 X structure wurtzite de ces �chantillons a �t� confirm�e par des mesures de diffraction des rayons X. La forte the nitrogen-rich regime (growth regime in excess of nitrogen) [2]. Under optimal conditions, pure wurtzite Ga1
We suppose here that the incident wave-vector k is not perpendicular to the grating grooves. The method we propose leads to two integral equations very similar to those encountered in the classical case where k is perpendicular to the grooves. Some computation has already been achieved on the UNIVAC 1108 computer, they are in good agreement with the conservation of energy.
-plated with cyclohexane A. Razafitianamaharavo (1), P. Convert (2), J. P. Coulomb (3), B. Croset (4) and N. Dupont) pr�-recouverte d'une monocouche de cyclohexane a �t� �tudi� par diffraction de neutrons et de rayons X K provoque la compression de la couche de cyclohexane pr�-adsorb� jusqu'� son �tat le plus dense
Radial distribution functions have been calculated from x-ray diffraction data by means of digital computer programs for Co-alpha (h.c.p.) annnd Co-beta (f.c.c.) near the allotropic transformation temperature. These functions provide values of lattice par...
Two approaches of the dynamical theory of diffraction (EWALD's and ANTHIER's) are recalled briefly. In the light of these theories, one then considers what information concerning the dislocations existing in a crystal can be obtained by X-Ray as well as e...
An X-ray diffraction method for characterizing austenitic steels after quenching was studied in order to determine its precision and sensitivity. A theoretical discussion of the method and its applications for industrial use is followed by descriptions of...
Neutron activation analysis and use of radioactive tracers, completed by X-ray diffraction, allowed us to quantitatively study the transformations in a biomaterial (coral) implanted 'in vivo'. Before its implantation, the biomaterial is sterilized. Steril...
The average particle size of platinum black samples was determined by X-ray diffraction, adsorption (BET), and electron microscopic techniques. Stacking faults, twinning, locked-in strain, and stored energy were obtained by the Warren-Averbach method. Par...
Proteins with both peptidylprolyl isomerase (PPIase) and chaperone activities play a crucial role in protein folding in the periplasm of Gram-negative bacteria. Few such proteins have been structurally characterized and to date only the crystal structure of SurA from Escherichia coli has been reported. Par27, the prototype of a new group of parvulins, has recently been ...
PubMed Central
Une �tude structurale par diffraction des rayons X des compos�s YCo{4.x}NixB est pr�sent�e. Elle met en valeur l'apparition d'une surstructure cristallographique d�s lors que la teneur en nickel est non nulle. Les mesures effectu�es avant et apr�s recuit indiquent que le traitement thermique joue un r�le essentiel sur la microstructure ...
After a thermomechanical loading, it resides within a polycrystalline material an heterogeneous elastic strain field resulting from accommodation of the plastic and/or thermal local deformations. X-rays or neutrons diffraction makes it possible to quantify the average strain and their fluctuations within the diffracting volume (displacement and broadening ...
La miniaturisation de modules Peltier passe par la recherche de techniques de synth�se appropri�es pour l��laboration de film minces d�alliages de mat�riaux thermo�lectriques. Les proc�d�s de synth�se couramment rencontr�s sont bas�s sur diff�rents principes pr�sentant de nombreux inconv�nients techniques. Une technique plus simple ...
