The LUMINEU project aims at developing a pilot double β decay experiment using scintillating bolometers based on ZnMoO 4 crystals enriched in 100 Mo. In the next months regular deliveries of large-mass ZnMoO 4 crystals are expected from the Nikolaev Institute of Inorganic Chemistry (Novosibirsk, Russia). It is therefore crucial for the LUMINEU program to test systematically and in real time these samples in terms of bolometric properties, light yield and internal radioactive contamination. In this paper we describe an aboveground cryogenic facility based on a dilution refrigerator coupled to a pulse-tube cooler capable performing these measurements. A 23.8 g ZnMoO 4 crystal was fully characterised in this setup. We show also that macro-bolometers can be operated with high signalto-noise ratio in liquid-free dilution refrigerators.
We present the results of electric contact resistance measurements at low temperatures on copper-to-copper bolted joints. Our accurate and systematic data display a rather small dispersion, and may be a useful tool for cryogenic applications like pulse-tubes, dilution refrigerators and nuclear refrigerators.
Corrosion inhibition effect of Sesbania sesban extract (SSE) on the carbon steel in 1M HCl solution was investigated by potentiodynamic polarization and weight loss techniques. The corrosion rate of carbon steel was decreased in the presence of SSE. The corrosion inhibition efficiency was found to increase with SSE concentration to attain 91.08% with 2.00 g/l at 25 . The polarization studies showed that SSE acts as mixed type inhibitor. The effect of temperature, acid concentration and immersion time on the corrosion rate of carbon steel in HCl solution in the absences and presence of SSE was also studied. Values of corrosion inhibition efficiency calculated from weight loss technique were in good agreement with those obtained from potentiodynamic polarization test. The results showed that the adsorption of the extract on the carbon steel surface obeys Langmuir isotherm. The activation parameters, apparent activation energy (E a , the enthalpy of activation (ΔH a ) and entropy of activation (ΔS a ) for the corrosion of carbon steel in 1M HCl in the absence and presence of SSE were calculated and discussed.
The improvement of Basrah asphalt cement that used in hot mix pavement can be achieved by using four influencing variables, which are the value of temperature needed for mixing, time of mixing, the amount of wasted car tire rubber (WCR) and the amount of wasted truck tire rubber (WTR). The main virtue of this study is to know the affecting of classifying the CRM sources, and how that will enhance the properties of tire rubber modified asphalt binder. The improvement is estimated through using the ranges (150-180 o C) of temperature, (20-60) minute of mixing time, (10-20) gm of WCR and (0-4) gm of WTR.The using of two different types of waste tires had shown clearly the affecting on the results of responses studied. The effect of independent variables was studied by using Box-Wilson technique of experimental design. Moreover, the regression coefficients for responses models equation and the optimum conditions were estimated by using STATISTICA software.The results had shown that the optimum values of the independent variables to submit the Journal of Environment and Ecology 28 best responses of penetration test and softening point test was at temperature (180 o C), mixing time (60 minute), WCR (20 gm), and WTR (4gm) and then found new mathematical models to estimate these responses at any values of independent variables. The Marshall stability result of the modified asphalt mixes was higher than of the unmodified asphalt mixes.
Abstract:The selection study for a sanitary landfill site at Basra city (south of Iraq) indicated to choose Al-Barjesia region at chwabedian area which belong to Al-Zubair directorate, using global positioning system (GPS). The measured latitude and longitude axes of this area are 30° 25.4′ north and 47° 29′ west. It is located at a distance of about 25 km straight line from the city center. The calculated elevation range of the chwabedian site was obtained to be 5-10 m above sea level, while the depth of plutonic water in the landfill site is range from 15-25 m. The measured permeability for this site was about 0.75-0.84 mm 3 /min. The evaluation of soil components percentage in the suggested site was listed in table 1, as examined by the international constructional laboratory, at Basra/Iraq. A primarily modern design for chwabedian sanitary landfill was projected and sketched in figure 3.
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