نتایج جستجو برای: quartz crystals
تعداد نتایج: 67066 فیلتر نتایج به سال:
Gravitation is parity symmetric or antisymmetric. Mass distribution parity divergence varies from χ = 0 (achiral) to χ = 1 (perfect). A parity Eötvös experiment contrasts chemically and macroscopically identical enantiomorphic space groups P3121 and P3221 α-quartz single crystal test masses. A parity calorimetry experiment contrasts P3121 and P3221 benzil single crystals enthalpies of fusion. ...
The efficiency of nonequilibrium electron trapping by capture centers in alkali halide crystals, quartz, and polymethyl-methacrylate exposed to an intense electron beam with a beam current density of about 20 A/cm 2 is studied. The trapped charge is estimated from the amount of irradiation-induced electrification of high-resistivity materials. It is shown that traps having captured thermalized ...
Narrow X-ray lines from helium-like argon emitted from a dedicated ECR source have been used to determine the response function of a Bragg crystal spectrometer equipped with large area spherically bent silicon (111) or quartz (101̄) crystals. The measured spectra are compared with simulated ones created by a ray-tracing code based on the expected theoretical crystal’s rocking curve and the geome...
Shape or habit of crystal is controlled by physicochemical conditions of crystallization, thus quantitative measurements of crystal shape can reveal aspects of crystallization environment. In this paper, based on statistical calculations, numerical modeling software and microscopic observations. various methods of quantitative measurement of the shape of crystal have used More than 3200 plagioc...
Quartz-type MOF (Me2NH2)2[Cd(NO2BDC)2] (SHF-81) exhibits anisotropic breathing behaviour as single crystals in response to multiple stimuli.
Quartz crystal microbalance (QCM) is a high sensitive chemical sensor which has found widespread spectrum of applications. There are several mechanisms that are related to fluctuation phenomena. Since the aim of our research is oriented to study the sensitivity and influence of different kind of noises on sensor resolution, we modified an existing method to measure the small frequency fluctuati...
Currently there are a few fields of application using quartz crystal microbalances (QCM). Because of environmental conditions and insufficient resolution of the microbalance, chemical sensing of volatile organic compounds in an open system was as yet not possible. In this study we present strategies on how to use 195 MHz fundamental quartz resonators for a mobile sensor platform to detect airbo...
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