射频负离子源关键参数测量系统研制

强流离子源是大功率中性束注入系统的关键部件之一,为了实现中性束注入系统的稳态运行,需要开展射频负离子源的实验研究。射频负离子源的负离子引出电流、引出总电流和引出电子流等关键参数的测量是射频离子源实验理论分析的基础,本系统通过信号调理隔离传输实现射频负离子源关键参数的测量。实验结果表明,系统测量采集数据精准可靠,运行稳定。     

Thermal analysis of EAST neutral beam injectors for long-pulse beam operation

Two sets of neutral beam injectors(NBI-1 and NBI-2) have been mounted on the EAST tokamak since 2014. NBI-1 and NBI-2 are co-direction and counter-direction, respectively. As with indepth physics and engineering study of EAST, the ability of long pulse beam injection should be required in the NBI system. For NBIs, the most important and difficult thing that should be overcome is heat removal capacity of heat loaded components for long-pulse beam extraction. In this article, the thermal state of the components of EAST NBI is investigated using water flow calorimetry and thermocouple temperatures. Results show that(1) operation parameters have an obvious influence on the heat deposited on the inner components of the beamline,(2) a suitable operation parameter can decrease the heat loading effectively and obtain longer beam pulse length, and(3) under the cooling water pressure of 0.25 MPa, the predicted maximum beam pulse length will be up to 260 s with 50 keV beam energy by a duty factor of 0.5. The results present that, in this regard, the EAST NBI-1 system has the ability of long-pulse beam injection.     

Using Adaptive Discrete-Time Gas Supply Control for Long Pulse Arc Discharge of Ion Source on NBI

A control model of gas supply system is introduced for ion source and an adaptive discrete-time control algorithm to regulate the hydrogen injection. A real-time feedback control system （RFCS） is designed to control the gas supply for ion source based on the control model and the discrete-time control algorithm. The experimental results have proved that RFCS could regulate the gas supply smoothly, suppress the arc＇s abrupt over-current at the end of the ion source discharging, prolong the discharge pulse and stabilize the ion concentration. With RFCS, the ion source for neutral beam injection has reached its longest pulse with a length of 4.5 seconds in a stable status.     

基于先验动态形状约束的视频目标提取

准确的目标提取是视频监视和视觉合成系统中的基础和关键步骤。然而背景和目标的复杂性通常导致目标难以从背景区分。针对此问题,本文提出了一种针对单摄像机的视频图像的目标提取新算法。首先在马尔可夫随机场的框架下将先验形状约束定义为从分割结果到先验形状之间轮廓变换的距离,并结合目标的检测似然度的信息统一为势函数,再用Graph Cut获取分割的全局最优解;为了反映形变的时空相关性,进而提出基于先验知识的动态形状的概念,用主成分分析将形状映射到低维度的潜变量子空间,并对潜变量变化趋势的建立自回归模型,通过模型预测指导分割过程;同时模型参数和系统状态利用分割结果在线更新。试验表明,该算法能够适应目标的外形变化,并能在目标被部分遮挡或难以从背景区分的情况下准确提取,鲁棒性较好,能够为机器视觉应用提供中级视觉的信息。     

两种超滤膜污染化学清洗方法比较

某电厂在高参数长周期运行后超滤系统膜组件存在严重的生物污损和铁污染,确定采用碱洗法和酸洗法两种方案清洗滤膜。经两种方案超滤膜化学清洗方案比较发现,酸洗法效果显著,碱洗法效果不明显。经酸洗后,单套超滤膜系统压差降至15～20kPa,产水流量达到100～122t/h。     

直流锅炉氢氟酸化学清洗

本文介绍了运行直流锅炉采用氢氟酸半闭半循环化学清洗方法的工艺特点、控制方法等,详细叙述了化学清洗过程,通过清洗效果比较,说明了半闭半循环化学清洗方法的优势,炎同类型锅炉进行氢氟酸化学清洗提供了经验借鉴。     

R&D progress of high power ion source on EAST-NBI

The neutral beam injector(NBI) system was designed and developed mainly for the plasma heating on the Experimental Advanced Superconducting Tokamak(EAST). The high power ion source is the key part of the NBI. A hot cathode ion source was used on the EAST-NBI. The ion source was conditioned on the ion source test bed with hydrogen gas and achieved the designed parameters. The deuterium gas was used when it moved to the EAST-NBI. The main performance of the ion source on EAST is presented in this paper. The highest beam power of 4.5 MW in NBI-1 and 2.75 MW in NBI-2 was achieved. The total neutral beam power is about 4.5 MW. The long pulse beam of 100 s is injected into the EAST plasma too.     

直流锅炉氢氟酸化学清洗

本文介绍了运行直流锅炉采用氢氟酸半闭半循环化学清洗方法的工艺特点、控制方法等,详细叙述了化学清洗过程,通过清洗效果比较,说明了半闭半循环化学清洗方法的优势,炎同类型锅炉进行氢氟酸化学清洗提供了经验借鉴。     

房屋建筑防渗漏施工技术要点

随着社会的不断进步,建筑物的标准也在不断的提高。渗漏问题长期以来一直影响着建筑物正常使用和建筑行业的发展。目前解决建筑物渗漏已成为工程技术人员研究的重要课题,是当前建筑工程施工中的主要管理措施。本文通过当前建筑工程施工中的防渗透技术的施工要点进行分析,提出其相应的控制手段和防治措施,为广大施工人员提供借鉴依据。     

110 kV电缆线路护层接地方式及护层保护的一些措施

近年来,随着城市改造建设的加速、随着电网网架结构的改善,城区110 kV电缆线路大量投入运行.110 kV电缆线路以其设计寿命长、受外界自然条件影响小、日常维护工作量相对较小、不影响城市景观等优点得到了肯定.但是, 110 kv电缆线路为单芯电缆,必需考虑限制其护层感应电压,其接地方式若在设计、生产、安装、运行维护的任何一个环节出现问题,过电压均会导致电缆外护层击穿,从而形成环流、发生腐蚀,最终影响电缆线路的载流量及运行寿命.常见的110 kV电缆护层接地方式及护层保护的一些措施进行分析.