1,051 research outputs found

    Studies of Nanotube Channeling for Efficient Beam Scraping at Accelerators

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    While particle beam steering (and in particular, "scraping") in accelerators by bent channeling crystals is an established technique extensively tested at IHEP Protvino and other major high-energy labs, an interesting question is how one could improve channeling capabilities by applying modern nanotechnology. Theoretical research of nanotube channeling was in progress over recent years. In this work, we assess potential benefits from nanotube channeling for real accelerator systems. We report simulation studies of channeling in nanostructured material (carbon SWNT and MWNT) tested for possible serving as a primary scraper for the collimation systems of hadron colliders. The advantages of nanostructured material as a potential choice for a primary scraper in a high-energy accelerator such as LHC or the Tevatron are discussed in comparison to crystal lattices and amorphous material. We evaluate physical processes relevant to this application and reveal nanotechnology requirements.Comment: Presented at the Int. Conf. on Atomic Collisions with Solids (ICACS-21, Genova 4-9 July 2004

    Channeling of high-energy particles in a multi-wall nanotube

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    Channeling of high-energy particles in straight and bent multi-wall nanotubes (MWNT) has been studied in computer simulations and compared to the channeling properties of single-wall nanotubes (SWNT) and bent crystal lattices. It is demonstrated that MWNT can efficiently channel positively-charged high-energy particles trapped between the walls of MWNT. Bending dechanneling in MWNT has been computed as a function of the particle momentum to nanotube curvature radius ratio, pv/Rpv/R. It is found that a bent MWNT can steer a particle beam with bending capabilities similar to those of bent silicon crystal lattice and to those of best (i.e. the narrowest) SWNT. In view of channeling applications at particle accelerators, MWNT appear favored as compared to SWNT, because MWNT can be produced quite straight (and in aligned array), while SWNT is typically very curved, thus posing a severe problem for channeling applications. Therefore, we suggest that MWNT provide a better candidate for channeling than SWNT.Comment: 16 pages, 6 figures, to appear in Phys. Lett.

    Experimental Study of the Cloud Architecture Selection for Effective Big Data Processing

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    Big data dictate their requirements to the hardware and software. Simple migration to the cloud data processing, while solving the problem of increasing computational capabilities, however creates some issues: the need to ensure the safety, the need to control the quality during data transmission, the need to optimize requests. Computational cloud does not simply provide scalable resources but also requires network infrastructure, unknown routes and the number of user requests. In addition, during functioning situation can occur, in which you need to change the architecture of the application - part of the data needs to be placed in a private cloud, part in a public cloud, part stays on the client

    Objective and subjective factors of efficiency and performance of medical audit

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    The work is devoted to analysis factors affecting the effective operation of quality management systems in health care institutions. It is shown important role of quality of carrying out audits, internal and external, in elimination of various kinds of risks and discrepancies in activity of medical institutions. Two main factors were revealed which influencing the quality of audit: 1. Subjective or "human" factor, consisting in sufficient motivation of the top management and internal auditors of medical institutions. 2. Objective or technological factor, consisting in sufficient training of internal auditors, adequacy selected audit methodology, etc

    New paradigm of the medical audit: multidisciplinary or transdisciplinary approaches?

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    The study is devoted to formation a new paradigm in relation the essence of medical audit. Using the example of requirements international quality standards ISO 90001: 2015 and GCP, it is shown that disciplinary and multidisciplinary approaches are progressive steps in implementing the quality policy in medical services, but they are unable to overcome the fundamental drawback - fragmentation the system.Thus, the audit quality management system in health care institution, in accordance with the ISO 9001 standard, does not allow assessing the quality of procedures performed by medical personnel, the adequacy of diagnostic and therapeutic actions in relation to nosological units, the comparative efficiency and effectiveness methods of treatment and diagnostics used. In its turn, the clinical audit by GCP standard is not able to detect defects work of support services, various risks accompanying medical activities, reveal the degree of patient satisfaction with medical services and provide evidence of economic viability to partners. Economic audit, in turn, is not able to give an idea of competence level of management and medical personnel in medical institution.A more complete picture activity a medical institution can be obtained through a medical audit involving an interdisciplinary approach in which a new system-forming concept is formed on the basis of integration data from various disciplinary methods

    The first light of Mini-MegaTORTORA wide-field monitoring system

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    Here we describe the first light of the novel 9-channel wide-field optical monitoring system with sub-second temporal resolution, Mini-MegaTORTORA, which is being tested now at Special Astrophysical Observatory on Russian Caucasus. The system is able to observe the sky simultaneously in either wide (~900 square degrees) or narrow (~100 square degrees) fields of view, either in clear light or with any combination of color (Johnson B, V or R) polarimetric filters installed, with exposure times ranging from 100 ms to 100 s. The primary goal of the system is the detection of rapid -- with sub-second characteristic time-scales -- optical transients, but it may be also used for studying the variability of the sky objects on longer time scales.Comment: 9 pages, 9 figures, based on the talk presented on "Modern stellar astronomy-2014" (Rostov-on-Don
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