Results 1 - 10 of 517
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[en] The results of experimental studies of positron generation near the threshold carried out in 2018 at the ILC MSU femtosecond laser complex and the LUE-8 linear electron accelerator of the Institute for Nuclear Research of the Russian Academy of Sciences are presented. The measurements were carried out using three different detection methods: using a MEDIPIX detector; phosphor films and video cameras; as well as scintillation arrays and silicon photomultipliers.
[en] A vessel air gap monitoring system for use on shipping lanes, and harbours to protect bridges and other structures is reported. The system utilizes two video cameras to monitor a transect of the waterway downstream from a bridge and image processing to automatically detect vessels and measure the highest point of the superstructure. The system has been successfully trialed on the Loop 602 bridge across the Houston Ship Channel.
[en] An early intrusion detection and video assessment, well in advance of a perimeter penetration, give personnel critical information and extra time to effectively respond to varied threats. Concealing small numbers of video verified portable intrusion sensor/transmitters observing critical remote assets and distance approaches to facilities immediately gives advanced warning of threats without traditional false alarm problems. By adding image assessment, reliable intrusion detection in environmentally sensitive areas, during temporary construction, along waterfronts, where wildlife are present, and in very remote areas in now practical with portable intrusion sensors. The paper discusses how to effectively integrate radio transmission, sensing, and video into low power systems for early verified detection in nuclear facilities
[en] An economic approach for the preliminary assessment of 2–10 µm sized (PM10) airborne particle levels in urban areas is described. It uses existing urban closed-circuit television (CCTV) surveillance camera networks in combination with particle accumulating units and chromatic quantification of polychromatic light scattered by the captured particles. Methods for accommodating extraneous light effects are discussed and test results obtained from real urban sites are presented to illustrate the potential of the approach
[en] Super fast auroral waves, propagating equatorward with speeds of up to 1,200 km/s over distances exceeding 1,400 km, have been observed at Sanae (L = 4) Antarctica by an all sky low light level TV systems. Such speeds greatly exceed those previously reported for fast auroral waves, or of any other auroral form, hence the description superfast. The altitude and speed of the waves have been determined using a novel technique that requires only one point of observation. Baseline triangulation from multiple ground based observations can be avoided because the earth is not flat. 2 refs., 4 figs
[en] A set-up, based on a CCD camera, to localize fluorescent inclusions in diffusing media was developed. This set-up allows one to acquire a huge dataset along two axes. This aspect is fundamental to performing a tomographic reconstruction in order to quantify the fluorescence amplitude in each voxel of the sample. Firstly, a simple analytical approach to recover the position of a single inclusion, embedded in a turbid medium, was developed. Then, we implemented a reconstruction algorithm to recover the position of one and two inclusions and to estimate their relative concentrations. Finally, we studied the dependence of reconstructed data on the number of injection points of excitation light and the number of detection points of fluorescence emission
[en] This paper introduces the newest research production on patient positioning method in accurate radiotherapy brought by Accurate Radiotherapy Treating System (ARTS) research team of Institute of Plasma Physics of Chinese Academy of Sciences, such as the positioning system based on binocular vision, the position-measuring system based on contour matching and the breath gate controlling system for positioning. Their basic principle, the application occasion and the prospects are briefly depicted. (authors)
[en] The applications of the digital video image to the investigation of physical phenomena have increased enormously in recent years. The advances in computer technology and image recognition techniques allow the analysis of more complex problems. In this work, we study the movement of a damped coupled oscillation system. The motion is considered as a linear combination of two normal modes, i.e. the symmetric and antisymmetric modes. The image of the experiment is recorded with a video camera and analysed by means of software developed in our laboratory. The results show a very good agreement with the theory