Showing papers by "Conservatoire national des arts et métiers published in 1983"
TL;DR: In this paper, the UV absorbance, corrected fluorescence spectra, quantum yields and lifetimes of 4-bromomethyl-6,7-dimethoxycoumarin derivatives of carboxylic acids as well as of a few fatty esters are presented.
87 citations
TL;DR: In this paper, the authors discuss the difficulties of identifying, relating and foreseeing explanatory variables; assessing degrees of uncertainty; and making the best use of consultants in forecasting, in which forecasts are generated in the light of scenarios.
35 citations
TL;DR: In this paper, the separationt des aminoacides N-benzyles is effectuesoit sur lacide soit sur l'ester, controlees par RMN( 1 H, 13 C, 31 P) and lorsque c'est possible par CPG.
22 citations
TL;DR: In this paper, the authors examined the behaviour of a profit-maximizing firm which forecasts a recession and which has at its disposal to regulate its level of equipment and their level of employment, three control variables (investment, recruitment, firing) being held constant.
10 citations
01 May 1983
TL;DR: In this article, a method for separating the relative contribution of the dye and the matrix in the total attenuation of light is proposed for fluorescent solar concentrators using liquid solutions of organic dyes.
Abstract: Various aspects of fluorescent solar concentrators using liquid solutions of organic dyes are considered. No significant difference in efficiency is observed between various collector geometries. The origins of light losses are carefully examined. A method is proposed for separating the relative contribution of the dye and the matrix in the total attenuation of light. Special attention is paid to light losses by imperfect multiple reflections and by reabsorption of fluorescence photons. Attenuation lengths in collectors using a thin layer of concentrated solution are significantly longer.
9 citations
TL;DR: In this paper, the distribution of captured electrons in the 60 keV O 6+ + H 2 → O 5+∗ (nl) + collision is studied by detection of the subsequent far UV radiation.
8 citations
TL;DR: In this article, the authors reviewed the use of sealed cells to determine the triple points, melting or freezing points of the International Practical Temperature Scale of 1968 (IPTS-68).
5 citations
TL;DR: In this paper, the radiative Auger emission intensity in K X-rays from neon was measured following electron bombardment by 1 to 2 keV electrons and the measured relative intensities of this process were in good agreement with calculations of Dyall using correlated final-state wavefunctions.
5 citations
01 Aug 1983
TL;DR: In this paper, the sensitivity and time constant of a thermophile made of semiconducting thin thermoelements with a radial symmetry and operating in a vacuum was calculated using a simple model.
Abstract: Using a simple model, sensitivity and time constant of a thermophile made of semiconducting thin thermoelements with a radial symmetry and operating in a vacuum, have been calculated. The radiation flux, collected by a metal disc covered with a thick layer of gold black, flows to the heat reservoir at constant temperature T 0 surrounding the receiver by conduction and thermal radiation. A flux sensitivity S Φ =68.5 V W −1 and a time constant τ=0.76 s have been obtained, in good agreement with experiments A l'aide d'un modele simple, on calcule de facon approchee la sensibilite et la constante de temps de thermopiles a elements semi conducteurs en films minces deposes sur un substrat isolant mince, selon une disposition radiale. Le recepteur est un disque metallique central, couvert de noir d'or. Le flux rayonne est plus important que le flux qui s'ecoule par conduction. La convection est negligee, l'ensemble etant sous vide. Les resultats donnes par le calcul sont en tres bon accord avec les resultats experimentaux. On obtient, pour la sensibilite au flux S Φ =68,5 V W −1 , et pour la constante de temps τ=0,76 s
4 citations
TL;DR: In this article, les matrices de transfert, de raideur dynamique ou de souplesse dynamique, des tiges rectilignes vibrant en traction-compression, ou en torsion peuvent etre symetriques par rapport a la deuxieme diagonale.
3 citations
TL;DR: In this article, the authors studied the kinetics of hydrolysis of D- and L-histidine methyl esters in the presence of crosslinked hydrophilic polymeric supports bearing Lhistidine moieties complexed with Ni2+ salt.
Abstract: The kinetics of hydrolysis of D- and L-histidine methyl ester were studied in the presence of crosslinked hydrophilic polymeric supports bearing L-histidine moieties complexed with Ni2+ salt. The selectivity of hydrolysis (kD/kL ratio) rises with the increase of the hydrophilic character (content of monomeric units of 2-hydroxyethyl methacrylate) of the resin. It varies with the ratio ester / catalytic moiety, the best result being obtained when the latter is close to 1. The selectivity depends on the temperature and an inversion of this selectivity is observed at 31°C. The optimization of all the parameters studied allowed to reach the same enantioselectivity and comparable rates of hydrolysis as observed in a model reaction carried out under homogeneous conditions.
TL;DR: In this paper, the authors consider the case of a firm which only develops through self-financing and combines labour and equipment to obtain a production sold on the market in exchange of random proceeds.