178 research outputs found
Experimental He-pressure broadening for the R(10) and P(2) lines in the ν 3 band of 13CO 2, and experimental pressure shifts for R(10) measured at several temperatures between 300 K and 100 K
No full textInternational audienceHelium broadening coefficients for the R(10) and the P(2) lines in the ν 3 band of 13CO 2 have been measured over a large range of temperature (70 K-300 K). Helium pressure shifts for the R(10) line at several temperatures between 100 K and 300 K have also been determined. These measurements were obtained with a cold Herriott cell, using the collisional cooling technique to reach the lowest temperatures. They provide an extended dataset for the temperature dependence of widths and shifts. This dataset was compared to theoretical He-broadening coefficients combining quantum scattering calculations and the latest potential energy surface for the system He-CO 2 from Korona et al. [T. Korona, R. Moszynski, F. Thibault, J.-M. Maunay, B. Bussery-Honvault, J. Boissoles, P.E.S. Wormer, J. Chem. Phys. 115 (2001) 3074-3084]
Second dielectric virial coefficient of helium gas: quantum-statistical calculations from an ab initio interaction-induced polarizability
Get PDFTransformacja systemowa bylej NRD - oczekiwania a rzeczywistosc. Oceny procesu w literaturze niemieckiej
No full textIn this paper an attempt is made to outline the views on the transformation of the former GDR formulated in the German scientific literature. Due to the limited scope of the paper and the magnitude and complexity of the phenomena, discussion is limited to the most important and most controversial - according to the author - aspects around which discussions were held between leading economists from academia and politicians. The study starts with a brief introduction regarding the merits of the transformation of the economic order of the former GDR. Further outlines early assessments of the economic condition of Eastern Germany and ideas on eventual reunification of the country. Then, following, if possible, the chronological order, an overview is provided of the most important assessment about elements of a new order, such as the monetary union and the deregulation of prices, changes in the ownership structure, the creation of the institutional framework and the situation on the labor market and financial transfers. The main scientific method applied is analysis of literature, evaluation of official documents and historical analysis
Temperature Dependence of CsI:Tl Scintillation Pulse Shapes from -183°C to +90°C Measured with a SiPM Readout
No full textA custom designed cryostat was constructed to
measure the response of a CsI:Tl scintillator in temperature
range from -183°C up to +90°C. The light readout was realized
using a SiPM developed by FBK in near ultraviolet high density
(NUV-HD) technology. The crystal and the SiPM were installed
on separated copper frames. The crystal was cooled down by
liquid nitrogen, while the SiPM was kept at temperature close to
room temperature. A separation of 1 mm was kept between the
crystal and the photodetector to ensure thermal isolation. The
temperature of the crystal could be varied by heaters on the
scintillator frame and was continuously monitored using a coil
shaped resistance thermometer. The CsI:Tl scintillation decay
profiles were recorded in the entire temperature range provided
by the cryostat
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Argonne National Laboratory Reports
No full textA semi-empirical relation for the thermal conductivity of helium-argon gas mixtures is suggested. The analyses used in support of the proposed conductivity relations are based on low-temperature (T < 800 degrees C) thermal conductivity data for helium, argon and helium-argon mixtures. The report is a compilation of available data and theories, and does not contain any new experimental results. With the approach presented here, one should be able to predict thermal conductivities of helium-argon mixtures to within 5% of their true values for temperatures up to 1200 K. The recommended equations are best estimates and should be treated as such. A definite need exists for experimental data to verify or modify the recommendation
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