نتایج جستجو برای: cryogenic equipment
تعداد نتایج: 84088 فیلتر نتایج به سال:
Abstract A high liquid krypton purity level is essential for the NA62 calorimeter at CERN to ensure long lifetimes of ionization electrons in detector. small time projection chamber (TPC) system was developed enable measurement oxygen equivalent ppb level. This paper describes dedicated cryogenic setup and procedures required operate monitor system, while guaranteeing condensation 119 K without...
Significant advances in the developmcmt of HEMT technology have resulted in high performance cryogenic, 1.,NAs whose noise temperatures arc within an order of magnitude of the quantum noise limit (hv/k). Key to the identification of optimum HEMT structures at cryogenic {temperatures is the clevelopmcnt of on-wafer noise and device parameter extraction techniques.
We have applied laser calorimetry to the measurement of optical absorption in monocrystalline sapphire at cryogenic temperatures. Sapphire is a promising candidate for the mirror substrates of the Large-scale Cryogenic Gravitational wave Telescope. The optical absorption coefficients of different sapphire samples at a wavelength of 1.064 μm at 5K were found to average 90 ppm/cm.
According to WHO, at any one time, around 50 per cent of medical equipment in lowand middle-income countries cannot be used because of lack of maintenance or spare parts.1 We have found that unwillingness or inability to repair equipment and put it back in use is also a major cause. New equipment is made available by different international non-government organisations (INGOs) competing with on...
Differential frost heave, alongwith the associated cryogenic disturbance that accompanies it, is an almost universal feature of arctic landscapes that potentially influences the fate of the soil carbon (C) stored in arctic soils. In this study, we quantify how gross ecosystem photosynthesis (GEP), soil respiration (Re) and the resulting net ecosystem exchange (NEE) vary in a patterned ground sy...
The cryogenic system for the KSTAR superconducting magnets has been commissioned. It consists of a cold box, distribution boxes (DB) and cryogenic transfer lines. The cold box and DB #1 provide 600 g/s of supercritical helium to cool the superconducting (SC) magnets, their SC bus-lines, and the magnet support structures. It also provides 17.5 g/s of liquid helium to the current leads and suppli...
Since ALMA instrument will have low noise receivers with very large instantaneous bandwidth, gain stability should be carefully specified to avoid limiting the sensitivity of the total system. This memorandum reviews the methods for the characterization of gain stability in the time and frequency domain and presents examples of experimental setups used for its measurement in the case of cryogen...
Microelectronic packaging plays an important role in cryogenic engineering; in particular, a solder joint as interconnection, which offers a mechanical, thermal and electrical support, undergoes much larger and harsher thermal changes during its service compared with conventional customer electronic products. The impact of thermo-mechanical properties of such solder joints under cryogenic servi...
Since the introduction 10 years ago of the dissolution method, Dynamic Nuclear Polarization (DNP) became a widely applied and powerful technique to enhance nuclear magnetic resonance (NMR) signals of low naturally abundant, insensitive nuclear spins for analytical chemistry and biomedical research. The aim of DNP is to obtain a very high degree of polarization on the nuclei of interest in cryog...
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