“库尔斯克”号核潜艇救捞中的放射性测量

失事核动力船舶救捞过程中,放射性测量对于控制事故恶化、保障救援人员辐射安全极其重要。本文根据有关资料,对"库尔斯克"号核潜艇救捞过程中所采取的放射性测量措施进行了总结,提出了失事核动力船舶救捞过程中有关的放射性测量需求和关键技术,为失事核动力船舶救捞中使用的放射性测量设备和技术的研究提供参考。     

基于网络的核电站PSA数据库管理系统设计研究

核电站PSA数据库管理系统是进行核电站安全评估的手段之一.按照数据库规范设计法,设计了基于网络的核电站PSA数据库管理系统NDMS,NDMS能为PSA提供方便而充分的数据.根据核电站实际情况,NDMS采用了网络化设计,并设计了用户管理机制及智能编码规则管理机制.目前NDMS已作为PSA分析软件RiskA的数据库平台得到了较好的应用.     

核动力船舶应急准备与响应关键技术研究

根据核动力船舶的设计和运行特点,以国内外相关导则和标准为技术依据,对核动力船舶应急准备与响应需解决的关键技术开展研究,提出划分核动力船舶的应急状态等级、确定与各应急状态等级相匹配的应急响应区域、对各应急响应区域内的人员实施相应防护行动的思路和方法。     

核电工程数据库的开发与ORACLE系统的选择

根据核电工程数据库的开发需求及ＯＲＡＣＬＥ数据库管理系统的特性，提出了选购ＯＲＡＣＬＥ系统的一些看法。     

欺骗压制组合式干扰机原理研究

主要介绍的是一种电子干扰技术在电子对抗中的有源干扰应用,在军事上已广泛应用.按照其工作性能有欺骗式干扰机和压制式干扰机.欺骗式干扰机能不断发射类似雷达的回波信号,对雷达产生欺骗干扰;压制式干扰机针对雷达的工作频带施放强度大于雷达回波的干扰信号,使雷达回波信号被干扰淹没.前者能量利用率较高,但在有些环境,欺骗干扰能力弱;...     

核电厂企业内容管理信息系统建设

数据已逐渐成为企业可持续发展、提高决策水平和创新能力的战略性资源;企业数据量快速膨胀,并呈现出来源多样化和类型复杂化的特点,传统关系数据库管理系统（RDBMS）处理的结构化数据仅占数据信息总量的15%,而全球85%的信息是非结构化的。如何管理这些非结构化信息,成为传统结构化数据管理的一大难题,而企业内容管理系统恰好是解决这一问题的有效方式。文章通过分析国内部分核电企业内容管理系统现状,提出了企业内容管理系统选型方面的建议,从实际应用出发探讨了核电厂企业内容管理系统的建设。     

最新资料介绍和出版预告

核工业北京地质研究院科技信息中心信息翻译部根据核工业发展形势,结合铀矿地贝工作需要,与有关单位和人员合作,收集大量信息,经选择翻译,编辑出版如下最新资料,供参考。 (1)《航天雷达技术应用研究及其进展》该书汇集了当前世界上航天雷达领域的最新资料,文章具有扎实的理论基础计有明显应用效果。全书以航天雷达技术的应用研究为主,内容涉及一系列当前遥感领域的前沿课题,其中包括:全球数学地形填图、海底地形特征对比、地震震后变形的研究、地质学和植物学研究、海潮间区的地形制图应用、热带雨林覆盖下的地质填图、三维数据的图样复合提取以及成像雷达     

用雷达和地震法探查砂金

地面探测雷达和地震探测是两项互为补充的高分辨率技术,它们可用来填制基■地形图和土壤地层图。现在的雷达设备在粗粒土壤中的探测效果最好。它的穿透深度达30 m,填制的地层层位图空间分辨率大于0.5 m。地震折射法的空间分辨率虽然明显低于雷达法,但它的穿透能力在导电环境中,如在粘土和粉砂土中,却能达到很高。地震反射技术与雷达法相似,但现在的地震仪器和震源只能达到有限的空间分辨率,并且在反射层深度不到20—30 m的地区,不能使用地震反射法。用地震折射法和地面探测雷达法一起能在许多情况下极好地确定出基岩深度。本文讨论了雷达法和地震法在砂金探查中的用途。介绍了野外测量方法、设备及所获得的数据,用两个实例说明了雷达、钻探和地震数据的对比结果。第三个实例表明简单的数据处理可以如何增强野外数据来提取更多的有关土壤层的详细资料。     

船舶汽轮机优化设计

船舶汽轮机是船舶动力装置中关键设备之一,且随着汽轮机大功率的发展趋势,其重量体积进一步增加,这给设备的设计安装带来困难,并严重影响船舶的机动性。因此,有必要在汽轮机设计中,应用优化技术寻找设计参数的最优组合,以减小汽轮机的重量或体积。建立船舶汽轮机设计计算数学模型,对其重量受冷凝器压力、高低压缸功率比和低压缸末级径高比影响的敏感性进行分析。以船舶汽轮机重量最小为目标函数,在满足一定的结构及性能约束条件下,利用混合粒子群算法对其进行优化设计。研究结果显示,采用优化方案后,汽轮机重量减小了3.13%。最后对优化结果进行了分析,指明了汽轮机优化设计的方向。     

核电厂放射性固体废物管理系统的研究与开发

目前我国在运核电厂和其他所有堆型（CPR1000、EPR和AP1000）的在建核电厂均缺少一套统一的放射性固体废物管理系统,缺乏对放射性固体废物从产生到最终处置的全周期跟踪管理。根据核电厂的放射性废物管理需求,研制了一套适合于各核电机型的核电厂放射性固体废物管理系统,对废物源项、处理、暂存、运输、处置全过程进行跟踪,使放射性废物管理安全、可控;研发了废物管理跟踪单和数据库,分析了废物管理工艺流程的逻辑关系,根据废树脂、浓缩液、废滤芯、检修废物等处理工艺分别设计了核素计算模型,可推算指定时刻的放射性水平,实现放射性废物数据的深度分析、应用以及对放射性废物安全管理的全过程追踪。研究成果已经在国内部分核电厂使用,有助于提高核电厂的放射性废物管理水平,具有较大的安全和社会意义。同时,该系统记录的数据有助于核电厂实现辐射防护优化设计和放射性废物最小化管理。     

用于托卡马克低混杂波电流驱动的多结波导阵天线

多结波导阵天线是为在中国科学院等离子体物理研究所的ＨＴ－６Ｂ、核工业西南物理研究院的ＨＬ－１和ＨＬ－１Ｍ托卡马克（Ｔｏｋａｍａｋ）装置上进行低混杂波电流驱动（ＬＨＣＤ）实验用的，已取得了一系列有价值的物理数据。文章着重介绍这类天线的物理和结构特性以及制造中的技术难点，并简要介绍用１×８和２×１２路多结阵天线分别在ＨＴ－６Ｂ、ＨＬ－１Ｍ托卡马克上进行的ＬＨＣＤ的实验结果。     

成像雷达技术在铀矿勘查中的应用

综合评述了成像雷达技术的发展历史、技术优势及其在地质构造、岩性识别等地学应用领域的研究现状,指出成像雷达技术作为当前遥感对地观测前沿技术之一,在新时期铀矿地质勘查中发展前景广阔。     

Experimental and numerical studies on the receiving gain enhancement modulated by a sub-wavelength plasma layer

A novel technique based on sub-wavelength plasma structure effects on enhancement of RF communication signals on a receiving antenna is carried out in this paper in laboratory experiments and analyzed by corresponding numerical simulations. Considerable intensification on receiving signal gain up to～10 dB in comparison with that without the plasma modulation is observed experimentally in～1 GHz RF band, with an effective enhancement bandwidth of～340 MHz and the fractional bandwidth of～34％. Then, the optimal modulation parameters of plasma are further studied by a numerical simulation. It is shown that the number density, the layer thickness, and the collision frequency of the plasma, as well as the relative distance between the plasma layer and antenna synergistically affect the modulation. Compared to the metallic antenna with the same overall dimension, the modulated antenna covered by the subwavelength plasma structure features higher receiving efficiency and lower radar cross section in the studied RF band. The mechanism of the reception enhancement is further revealed by analyzing characteristics of electromagnetic scattering and electric field distribution in the subwavelength plasma layer. The results then exhibit scientific significance and application potential of sub-wavelength plasma modulation on compact receiving antennas with higher performance and better feature of radar stealth.     

EAST ion cyclotron resonance heating system for long pulse operation

Radio frequency (RF) power in the ion cyclotron range of frequencies (ICRF) is one of the primary auxiliary heating techniques for Experimental Advanced Superconducting Tokamak (EAST). The ICRF system for EAST has been developed to support long-pulse high-β advanced tokamak fusion physics experiments. The ICRF system is capable of delivering 12 MW 1000-s RF power to the plasma through two antennas. The phasing between current straps of the antennas can be adjusted to optimize the RF power spectrum. The main technical features of the ICRF system are described. Each of the 8 ICRF transmitters has been successfully tested to 1.5 MW for a wide range of frequency (25–70 MHz) on a dummy load. Part of the ICRF system was in operation during the EAST 2012 spring experimental campaign and a maximum power of 800 kW (at 27 MHz) lasting for 30 s has been coupled for long pulse H mode operation.     

潜艇天线对核电磁脉冲的响应计算

核电磁脉冲通过天线耦合到潜艇的通讯、导航等电子系统中,会对电子系统产生冲击甚至物理损害。针对潜艇天线所处的不同状态,分析了天线对核电磁脉冲的响应,计算了天线中的感应电流强度和天线收集的能量数值,为防护措施的开展提供了依据。     

Simulations of first-orbit losses of neutral beam injection(NBI) fast ions on EAST

Simulations of first-orbit losses of neutral beam injection(NBI) fast ions in the EAST tokamak have been studied in detail by using the orbit-following code GYCAVA and the NBI code TGCO. Beam ion losses with the wall boundary are smaller than those with the last closed flux surface boundary. In contrast to heat loads on the wall without radio frequency wave(RFW)antennas, heat loads on the wall with RFW antennas are distributed more locally near the RFW antennas. The direction of the toroidal magnetic field dramatically affects the final positions of lost fast ions, which is related to the magnetic drift. The numerical results on heat loads of beam ions corresponding to different toroidal magnetic fields are qualitatively consistent with the experimental results. Beam ion losses increase with the beam energy for the co-current NBIs and the counter-perpendicular NBI. We have studied the behavior of fast ions produced by a small section neutral beam(beamlet) by using the numerical tool NBIT. The distributions of the loss fraction of beamlet fast ions peaked near the edge of the beam section for the counter-current NBIs, and they are related to the injection angle. This indicates that the first-orbit losses can be reduced by changing the shape of beam cross section.     

压缩感知理论在超宽带系统的应用前景分析

超宽带( Ultra - Wideband,UWB)在无线通信、雷达探测与成像、无线传感网络等领域具有广阔的应用前景.由于UWB脉冲信号的频带宽、时间宽度窄,高速采样已成为制约UWB无线系统快速发展的一个重要的技术瓶颈.压缩感知(Compressive Sensing or Compressed Sensing,CS)...     

Analysis of dynamic matching networks for the ICRF system at ASDEX Upgrade

The ICRF (Ion Cyclotron Range of Frequencies) system, used to heat the plasma of ASDEX Upgrade, consists of RF generators, 3 dB hybrids, coaxial transmission lines, matching networks and inductive loop antennas. The maximum power achievable by the generator strongly depends on the amplitude and phase of the reflection coefficient. Hence, matching of the antenna input impedance to the generator output impedance is essential for the ICRF heating system. The coupling between the ICRF antennas and the plasma is subject to relatively fast variations (few ms). The changes are caused by the modification of plasma edge conditions, such as L–H mode transitions, gas puffing or ELMs (Edge Localized Modes). These variations change the impedance of the ICRF antennas. For optimal operation of the ICRF system, a continuous, and fast matching is therefore preferable. A MATLAB^® based simulation tool has been developed to analyse matching networks for the ICRF system at ASDEX Upgrade. The program is highly flexible, and can solve the matching calculations for different conditions and configurations of the system. The results are presented in a Smith chart.     

Performance of the Scattering Matrix Arc Detection System on the JET ITER-like ICRF antenna

Ion Cyclotron Radio Frequency (ICRF) antennas operating under high voltage to couple high power to fusion plasmas are at risk of electrical arcing. The standard Voltage Standing Wave Ratio (VSWR) system does not protect low impedance areas, which are used in antennas to achieve load tolerance to variations in plasma loading during Edge Localised Modes (ELMs). The Scattering Matrix Arc Detection System (SMAD) was designed to create additional protection for these areas, and 4 complete systems were implemented and tested on the ITER-like antenna (ILA) on JET. This paper describes the performance under relevant experimental conditions of load tolerance and/or high voltage and electrical arcing causing generator trip events.