A neutron tomograph at the IR-8 reactor of the National Research Centre Kurchatov Institute

A transmission neutron tomograph developed by the National Research Centre Kurchatov Institute is described. The tomograph is located at the monochromatic neutron beam of the fifth horizontal channel of the IR-8 research reactor. The neutron wavelength is 1.56 Å, the beam cross section is 50 × 40 mm², the field of view of the CCD-based detector system is 93 × 62 mm², and the spatial resolution at the sample position is ～400 μm. The internal structure of samples having different origin has been investigated.     

模具CAD国家工程研究中心

模具ＣＡＤ国家工程研究中心（以下简称“中心”）经国家计委批准,于１９９５年３月在“上海模具技术研究所”基础上建立,是专门从事模具ＣＡＤ领域内高水平科研和成果转化的研究开发机构,依托上海交通大学。该中心负责人中国工程院院士阮雪榆教授是国际知名的塑性加工和模具专家、国家级有突出贡献的专家。该中心有教工１５０人,其中获高级职称２１位,中级职称３０位,是国家批准的硕士、博士培养点和博士后流动站。该中心有一支高素质的软件人才队伍,其中青年博士９名,硕士３２名,并有在读博士生４０余名,来自全国１４个院校,２…     

High-Intensity Neutron Fields at the Center of the Metallic Core of Fast Reactors as the Primary Standard Neutron Fields

It is proposed to use high-intensity neutron fields with an average neutron energy of 0.7–1.5 MeV at the center of the metallic core of fast reactors as the primary standard neutron fields along with the known standard fields of fission neutrons with average energies of 1.93 and 2.13 MeV, respectively, from ²³⁵U and ²⁵²Cf nuclei, which are used in the world practice of taking neutron measurements. It is also proposed to create standard fields of nuclear fission neutrons with an average energy of 2 MeV by the bombardment of ²³⁵U converters with a beam of fast monoenergetic neutrons with energies of 2.5 and 14 MeV and 50-MeV protons.     

Neutron analysis of the ITER vertical neutron camera

The neutron fields in the collimators of a new design for the vertical neutron camera (VNC) of the ITER have been calculated for a standard isotropic bulk DT neutron source. The neutron and gamma-ray spectra and flux densities at the neutron detector sites have been calculated. The signal-to-background ratio of VNC detectors (²³⁸U-based fission chambers and diamond detectors) has been estimated. The signal-to-background ratios versus the threshold energy were calculated for the diamond detectors operating in the threshold counter mode. The effect of background Γ-ray radiation on the performance of the diamond detectors in the VNC environment has been estimated. The radiation heating of the VNC structural components has been calculated. The serviceability of the VNC with the proposed design has been demonstrated.     

The new cold neutron chopper spectrometer at the Spallation Neutron Source: design and performance

The design and performance of the new cold neutron chopper spectrometer (CNCS) at the Spallation Neutron Source in Oak Ridge are described. CNCS is a direct-geometry inelastic time-of-flight spectrometer, designed essentially to cover the same energy and momentum transfer ranges as IN5 at ILL, LET at ISIS, DCS at NIST, TOFTOF at FRM-II, AMATERAS at J-PARC, PHAROS at LANSCE, and NEAT at HZB, at similar energy resolution. Measured values of key figures such as neutron flux at sample position and energy resolution are compared between measurements and ray tracing Monte Carlo simulations, and good agreement (better than 20% of absolute numbers) has been achieved. The instrument performs very well in the cold and thermal neutron energy ranges, and promises to become a workhorse for the neutron scattering community for quasielastic and inelastic scattering experiments.     

传感器工程化研究与国家工程研究中心

介绍了开展传感器工程化研究的必要性和工程化研究的内容，同时介绍了传感器国家工程研究中心的一些情况，揭示了在市场经济发展形式下，传感器行业向高层次发展的途径     

Interferometric measurement of length scales at the National Bureau of Standards

The interferometric comparator for calibrating graduated length scales at the National Bureau of Standards is described. Its origins and early development are traced, and recent modernization and automation are detailed. A measurement assurance program is used to evaluate precision, accuracy and long term performance     

智能型阀门电动装置相关标准规定的分析与研究

介绍了国内外智能型电动装置的生产流通现状及主要智能型电装的技术指示情况,分析了我国智能型电装国家标准规定的主要内容,并陈述了制订该标准的体会。     

Status of ion sources at National Institute of Radiological Sciences

The National Institute of Radiological Sciences (NIRS) maintains various ion accelerators in order to study the effects of radiation of the human body and medical uses of radiation. Two electrostatic tandem accelerators and three cyclotrons delivered by commercial companies have offered various life science tools; these include proton-induced x-ray emission analysis (PIXE), micro beam irradiation, neutron exposure, and radioisotope tracers and probes. A duoplasmatron, a multicusp ion source, a penning ion source (PIG), and an electron cyclotron resonance ion source (ECRIS) are in operation for these purposes. The Heavy-Ion Medical Accelerator in Chiba (HIMAC) is an accelerator complex for heavy-ion radiotherapy, fully developed by NIRS. HIMAC is utilized not only for daily treatment with the carbon beam but also for fundamental experiments. Several ECRISs and a PIG at HIMAC satisfy various research and clinical requirements.     

电动汽车产业化到底是标准问题还是技术问题

与近来充电还是换电的争论相对应的,是中国电动车推广几乎处于停滞的状态。一位国内电动车专家曾经直言,现在电动车的推广主要卡在了标准上。     

Construction and testing of the instrument for neutron holographic study at the Budapest Research Reactor

Neutron scattering device dedicated to neutron holography experiments is described. The device is operating at a constant wavelength prepared by a double focusing monochromator. It is equipped by highly efficient shielding, proper collimator, Eulerian cradle, monitor detector, gamma-ray, and neutron detectors as well. Relevant software serves as control for the measurement and data collection. The harmonized application of the components enumerated above makes our device extremely efficient and unparalleled. Two atomic resolution neutron holographic experiments carried out illustrate the efficiency and power of the instrument.     

高校实验中心的建设与实践

针对普通高校资金相对投入不足、师资力量薄弱、学生基础较差、信息交流不够的特点．提出了分层教学、资源共享、过程管理的改革设想,探索出针对普通高校特点的实验教学的改革方案,为普通高校基础课程实验中心的改革提供借鉴和参考。     

对电力机车采用国际或国家标准垫圈的探讨

提高机车装备质量,必须提高标准化水平;在用GB/T93弹簧垫圈替换CS垫圈的问题上,进行充分研究,为全面实现HXD2B型电力机车紧固件国产化摸索经验;为了推动企业的现代化管理,降低制造成本,在引进技术的消化吸收中必须推动采用国际标准和国家标准。     

基于风险的设计制造技术在国家技术标准中的应用

GB150《压力容器》（2011修订版,以下简称“新版GB150”）已于2011年11月发布,将于2012年3月起替代GB150--1998正式实施,“新版GB150”与2009午12月实施的《固定式压力容器安全技术监察规程》协调一致,适应近十年来国内外压力容器安全管理理念与技术进步,吸纳了一些成熟的科研成果,确保压力容器的本质安全并提高经济性,其中以风险评估为基础控制失效发生的可能性和后果的设计制造技术就是“新版GB150”的一个重要特点。受标准编制组委托,本文结合近十年国家科研项目成果与应用实践,就标准中的相关条款做一简要说明。     

我所中心实验室适应科研发展的几点措施

本文介绍了我所中心实验室适应科研发展的几点措施:管理与监督;面向一线,服务科研;承担部分科研课题;开放实验室.     

Development and experimental study of the neutron beam at the synchrocyclotron of the Petersburg Nuclear Physics Institute for radiation tests of electronic components

A neutron beam with an energy spectrum resembling that of atmospheric neutron radiation has been developed at the 1000-MeV synchrocyclotron of the Petersburg Nuclear Physics Institute. The beam is intended for testing the radiation resistance of electronics and meets the requirements of the JEDEC international standard. The only test facility in which the neutron spectrum is close to the standard in the energy range of 0.1–750 MeV has been developed at the Los Alamos National Laboratory on the basis the LAMPF linear proton accelerator and used by aviation and space companies of the United States, Europe, and Asia to test their electronic equipment. In contrast to the test facilities in Los Alamos and Uppsala (Sweden), the method of neutron production on an internal accelerator target is used by the Petersburg Nuclear Physics Institute. The development of the neutron beam and the test facility extends considerably the experimental potential of radiation research and can act as a basis for establishing a unique center for radiation tests of aviation and space electronic equipment in compliance with the requirements of international standards.     

Virtual characterization of the time-of-flight neutron reflectometer of the China Spallation Neutron Source

A general virtual experiment for the time-of-flight neutron reflectometer is introduced to simulate the experimental data collection and processing, including instrument simulation, sample modeling, detector simulation, and data reduction. The process mimics the experimental data processing and reduction routines. The reduced data agree well with the theoretical calculation, confirming the reliability of the data reduction algorithms. The methodology and algorithms developed in this study pave the way for the future development of data processing and data reduction software for the time-of-flight neutron reflectometer of China Spallation Neutron Source.     

Development and application of setup for ac magnetic field in neutron scattering experiments

We report on a new setup developed for neutron scattering experiments in periodically alternating magnetic fields at the sample position. The assembly consisting of rf generator, amplifier, wide band transformer, and resonance circuit. It allows to generate homogeneous ac magnetic fields over a volume of a few cm(3) and variable within a wide range of amplitudes and frequencies. The applicability of the device is exemplified by ac polarized neutron reflectometry (PNR): a new method established to probe remagnetization kinetics in soft ferromagnetic films. Test experiments with iron films demonstrate that the ac field within the accessible range of frequencies and amplitudes produces a dramatic effect on the PNR signal. This shows that the relevant ac field parameters generated by the device match well with the scales involved in the remagnetization processes. Other possible applications of the rf unit are briefly discussed.