Topic
Shields
About: Shields is a research topic. Over the lifetime, 1456 publications have been published within this topic receiving 10896 citations.
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TL;DR: In this paper, a nonstationary hydroelectroelasticity problem is solved to determine the pressure in the ambient medium when a spherical thin-walled piezoelectric transducer with a shield either inside or outside is excited with an electric pulse.
Abstract: A problem of nonstationary hydroelectroelasticity is solved to determine the pressure in the ambient medium when a spherical thin-walled piezoelectric transducer with a shield either inside or outside is excited with an electric pulse
10 citations
TL;DR: Structural dynamic analyses including the trajectory simulation on a CubeSat sized system has shown that the autorotation and deployment form a closed loop which reliably leads to an equilibrium of deployment, while the heat shield is near fully deployed at altitudes higher than 30 km with tolerable spin rate.
10 citations
TL;DR: In this article , the authors give an overview of the state-of-the-art polymer composites reinforced with different fillers studied for their use as effective radiation shields, highlighting the different approaches adopted, choice of polymer/fillers, shielding effectiveness in terms of either linear and/or mass attenuation coefficients, for those who venture into radiation research and development.
Abstract: Abstract Use of X-rays and γ-rays have become inevitable in medical sectors like radiology, interventional cardiology and diagnostic imaging, radiation physics laboratories, nuclear reactors and accelerator facilities. As radiation exposures above permitted levels pose potential risk to personnel working in close proximity to these facilities, protective measures aimed at reducing the exposure for safeguarding against harmful effects of ionizing radiations are essential. Traditionally, lead and lead based materials have been used as efficient radiation shielding materials owing to the high atomic number and high density of lead. Presently, use of lead is discouraged due to its heavy weight, toxicity and long-term effects on the environment. Consequently, the last two decades have seen research on light weight and cost-effective polymer composites with appropriate additives, having good workability, high specific strength, thermo-chemical stability and radiation shielding efficacy, gaining momentum. This article gives an overview of the state-of-the-art polymer composites reinforced with different fillers studied for their use as effective radiation shields. Here, we summarize the recent advancement and current trends in polymer composites-based radiation shields highlighting the different approaches adopted, choice of polymer/fillers, shielding effectiveness in terms of either linear and/or mass attenuation coefficients, for those who venture into radiation research and development.
10 citations
01 Dec 1986-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this paper, the operation of TPC-type photon detectors with optical shields between the sense wires has been investigated in magnetic fields up to 1.4 T. The results show that MWPCs with printed circuit board shields can be operated without loss of efficiency even at high magnetic fields.
Abstract: The operation of TPC-type photon detectors with optical shields between the sense wires has been investigated in magnetic fields up to 1.4 T. The field was applied perpendicularly to the drift direction. Three types of MWPCs with different optical shield designs were tested. Ethane and iso-butane were used as drift gases. TMAE vapour was added to obtain photon sensitivity. The results show that MWPCs with printed circuit board shields can be operated without loss of efficiency even at high magnetic fields. The MWPC with tubular cathode shows losses already at low fields.
10 citations
01 Jan 2010
TL;DR: In this article, the intercomparison of six kinds of artificially ventilated thermometer screens/shields and four kinds of naturally ventilated screens/helms was performed in Tsukuba from 1 August 2009 to 30 April 2010.
Abstract: In recent years, many types of screens/shields for temperature measurement equipment have been designed. In conjunction with such developments, WMO and National Meteorological Services have organized intercomparisons of a range of screens/shields to clarify their characteristics in the interests of ensuring the quality of temperature observation data. RIC-Tsukuba performed a characteristic investigation involving the intercomparison of six kinds of artificially ventilated thermometer screens/shields and four kinds of naturally ventilated thermometer screens/shields in Tsukuba from 1 August 2009 to 30 April 2010. With the artificially ventilated screens/shields, some differences were seen in the influence of global solar radiation from the variety of structures used, while the horizontal artificially ventilated screen/shield type was affected by rain as raindrops remained on it. With the naturally ventilated screens/shields, a maximum difference of +3.4°C was seen from the influence of global solar radiation, and some such screens/shields were affected by rain, as raindrops remained on plates or entered between them depending on their structure. From these evaluation results for various screen/shield types, RIC-Tsukuba drew up a comparative table and radar charts classified in terms of rank for the effects of various meteorological elements.
10 citations