Thermal Design and Performance of the Electrical Distribution Feed Box of the LHC prototype cell

The Electrical Distribution Feed Box (DFBS) is a 4.5 K saturated liquid helium cryostat constructed for the Large Hadron Collider (LHC) Prototype Cell (String 2). The thermal design of the DFBS is presented, with emphasis on the modelling of the cooling of the current lead chimneys via the helium bath boil-off gas and on the design of the lambda plate. The expected performance is compared to measurements done during the first operation phase of the LHC prototype cell

Study on Ecosystem Status and its Evolution in Jiulongjiang River Estuary

随着社会经济的发展和自然环境的变化，我国的河口生态系统面临着日益严重的压力和一系列生态灾害频发的风险，迫切需要对河口生态系统开展评价，从科学的角度分析生态系统过去、现状、成因、发展趋势，以指导生态系统管理工作。因此，研究河口生态系统状态及其演变具有重要的理论和实际应用价值。 目前，我国对河口生态系统状态的研究和评价的开展尚在探索阶段，还未形成制度化的评价机制、指标体系及评价方法，虽然有少量与河口生态系统相关的研究成果，但长时间序列的河口生态系统评价少之又少。本文构建了河口生态系统PSR模型评价指标体系，并以中国特有的五年经济社会发展规划时间为划分评价时间单元，建立了长期的河口生态系统状态演变...According to the development of community economy and the changes of natural environment, the estuarine ecosystem in China are faced with growing pressure and a series of risks of environment disaster. It is necessary to assessment on the estuarine ecosystem, to analyze the past, current status, cause and ecolution trends by scientific angles, in order to guide ecosystem management. Therefore, res...学位：理学硕士院系专业：海洋与环境学院海洋学系_海岸带综合管理学号：2242007115083

Study of the Stabilization to the Nanometer Level of Mechanical Vibrations of the CLIC Main Beam

Original publication available at http://www.jacow.org/International audienceTo reach the design luminosity of CLIC, the movements of the quadrupoles should be limited to the nanometre level in order to limit the beam size and emittance growth. Below 1 Hz, the movements of the main beam quadrupoles will be corrected by a beambased feedback. But above 1 Hz, the quadrupoles should be mechanically stabilized. A collaboration effort is ongoing between several institutes to study the feasibility of the "nanostabilization" of the CLIC quadrupoles. The study described in this paper covers the characterization of independent measuring techniques including optical methods to detect nanometre sized displacements and analyze the vibrations. Actuators and feedback algorithms for sub-nanometre movements of magnets with a mass of more than 400 kg are being developed and tested. Input is given to the design of the quadrupole magnets, the supports and alignment system in order to limit the amplification of the vibration sources at resonant frequencies. A full scale mock-up integrating all these features is presently under design. Finally, a series of experiments in accelerator environments should demonstrate the feasibility of the nanometre stabilization

Superconducting Magnets for a Final Focus Upgrade of ATF2

Original publication available at http://www.jacow.org/International audienceThe Accelerator Test Facility 2 (ATF2) at KEK is a scaled version of the final focus (FF) design proposed for a future linear collider (LC). A primary ATF2 goal is to experimentally verify the FF technology needed to obtain very small, stable beam spots at an LC interaction point [1]. Initially the ATF2 FF is made using conventional (warm) quadrupole and sextupole magnets. We intend to upgrade the ATF2 FF by replacing conventional magnets with new superconducting ones that use the same technology proposed for the International Linear Collider (ILC) baseline FF magnets [2]. With this upgrade we can investigate smaller interaction point beta-functions and study superconducting magnet vibration stability in an accelerator environment. Our ATF2 magnet cryostat design incorporates features to facilitate monitoring of the cold mass movement via interferometric techniques. The status and future plans for the ATF2 superconducting magnet upgrade are reported here

Внедрение и принцип работы системы сейсмического мониторинга горного массива для работы в условиях ООО "Шахта "Усковская"

The status of the Silicon Microvertex Detector (SMD) and its installation into the LEP-L3 experiment are presented, highlighting novel features and sophisticated techniques. Preliminary results based on 1993 data are given and compared with Monte Carlo predictions, to understand the detector performances and its tracking capabilities

The ATLAS TRT electronics

The ATLAS inner detector consists of three sub-systems: the pixel detector spanning the radius range 4cm-20cm, the semiconductor tracker at radii from 30 to 52 cm, and the transition radiation tracker (TRT), tracking from 56 to 107 cm. The TRT provides a combination of continuous tracking with many projective measurements based on individual drift tubes (or straws) and of electron identification based on transition radiation from fibres or foils interleaved between the straws themselves. This paper describes the on and off detector electronics for the TRT as well as the TRT portion of the data acquisition (DAQ) system

The ATLAS Transition Radiation Tracker (TRT) proportional drift tube: design and performance

A straw proportional counter is the basic element of the ATLAS Transition Radiation Tracker (TRT). Its detailed properties as well as the main properties of a few TRT operating gas mixtures are described. Particular attention is paid to straw tube performance in high radiation conditions and to its operational stability

Исследование структуры и механических свойств изделий, выращенных электродуговым послойным выращиванием

В процессе исследования проводились: литературный обзор по исследуемой тематике, проектирование, разработка и изготовление конструкции 3d-принтера, определение методов и методик исследований, исследование структуры металлических изделий, напечатанных на 3D-принтере, исследование механических свойства металлических изделий, напечатанных на 3D-принтере, произведен анализ вредных и опасных производственных факторов в лаборатории, расчет себестоимости изготовления.During the study, they conducted: a literary review on the subject, design, design and manufacture of the 3d-printer design, the identification of methods and methods of research, the study of the structure of metal products printed on a 3D-printer, the study of the mechanical properties of metal products printed on a 3D-printer, the analysis of harmful and dangerous production factors in the laboratory, the calculation of the cost of manufacture

Формирование стратегий аудирования иноязычной речи обучающихся неязыкового вуза

В статье рассматриваются стратегии восприятия и понимания иноязычной речи на слух, владение которыми позволяет обучающимся неязыкового вуза планировать, анализировать и оценивать собственную учебно-познавательную деятельность, направленную на достижение поставленной цели, что способствует повышению мотивации и вовлеченности в процесс обучения иностранному языку