Dependence of the internal inductance on the radial distance between the primary and secondary X-point surfaces in the EAST tokamak

In view of their advantage in long-pulse high-performance operations, low internal inductance scenarios are being developed and tested for the EAST and other tokamaks. Dependence of the internal inductance on several main plasma configuration parameters are statistically analyzed. It is found that the internal inductance of the plasma is closely related to the radial distance dR_sep between the primary and secondary X-point surfaces on the outer mid-plane as well as the poloidal field of the last closed flux surface. Moreover,dR_sep is also related to the distribution of the fast electrons driven by the injected lower-hybrid waves, which is partially responsible for the observed relation betweendR_sep and the internal inductance. The results here should therefore be helpful as a guide for future experiments on internal inductance control and long-pulse operations of the EAST and other tokamaks, as well as for detailed theoretical study of the underlying physics.     

PRC板在工程应用中的干缩形变与改善措施

人造水泥复合板密实性高、抗渗透能力强、干缩值小，但用大幅面的人造水泥复合板预测装配式墙体结构，因干缩引起的墙缝仍不容忽视。本文分别研究了ＰＲＣ板的干缩规律，并给建筑设计和施工提出了改进意见。     

油罐外部腐蚀及防护技术

介绍了石油化工企业原油储罐和成品油储罐的外腐蚀情况和影响因素。外腐蚀主要包括罐顶、罐底板和外壁的腐蚀。根据有保温层和无保温层的具体情况,提出了适宜的防腐蚀措施。指出：在两种情况下,罐顶和罐壁的防护均应以涂料防护为主,但选择的涂层体系有所不同；罐底板的防护则应以电化学保护为主,并应根据具体情况分别选择牺牲阳极法和外加电流法。     

摩托车主轴五档齿轮点蚀磨损的改善

某型125男式跨骑车主轴五档齿轮的齿宽小（〈1mm,见图1）,因此齿轮上的单位负荷及应力非常大,这就导致齿轮更容易产生耐久点蚀磨损。经反复试验后,我们最终彻底解决了点蚀磨损问题,下面把相关的经验介绍给各位同行参考。     

Combined Langmuir-magnetic probe measurements of type-Ⅰ ELMy filaments in the EAST tokamak

Detailed investigations on the filamentary structures associated with the type-I edge-localized modes(ELMs) should be helpful for protecting the materials of a plasma-facing wall on a future large device.Related experiments have been carefully conducted in the Experimental Advanced Superconducting Tokamak(EAST) using combined Langmuir-magnetic probes.The experimental results indicate that the radially outward velocity of type-I ELMy filaments can be up to 1.7 kms~(-1) in the far scrape-off layer(SOL) region.It is remarkable that the electron temperature of these filaments is detected to be ~50eV,corresponding to a fraction of 1/6 to the temperature near the pedestal top,while the density ~3×10~(19)m~(-3) of these filaments could be approximate to the line-averaged density.In addition,associated magnetic fluctuations have been clearly observed at the same time,which show good agreement with the density perturbations.A localized current on the order of ~100kA could be estimated within the filaments.     

应用交流变频调速技术改造龙门刨床主拖动

目前,仍在使用的龙门刨床大都是20世纪60～70年代的产品,电气控制方式落后,器件严重老化,加工效率低、耗电高、故障频繁、维修难度大。为此,我们对B2010A龙门刨床主拖动进行了技术改造。 主拖动调速系统的负荷性质如图1所示。图中,F_m表示最大切削力,υ表示切削速度,P_(m1)表示最大切削     

脉冲燃烧装置综述

为了节能和环境保护,国际燃气界近年来又致力于脉冲燃烧的研究。脉冲燃烧具有燃烧强度大,传热系数高,NOx排放量小,能自动吸气及排气等优点,也有调节比小,噪音大等缺点。当前国际上研究较多的是Helmholtz型脉冲燃烧器,并已进入产品开发阶段。脉冲燃烧装置具有广阔的应用前景,我国应加强该项研究。     

Combined Langmuir-magnetic probe measurements of type-I ELMy filaments in the EAST tokamak

Detailed investigations on the filamentary structures associated with the type-I edge-localized modes (ELMs) should be helpful for protecting the materials of a plasma-facing wall on a future large device. Related experiments have been carefully conducted in the Experimental Advanced Superconducting Tokamak (EAST) using combined Langmuir-magnetic probes. The experimental results indicate that the radially outward velocity of type-I ELMy filaments can be up to 1.7 km s^-1 in the far scrape-off layer (SOL) region. It is remarkable that the electron temperature of these filaments is detected to be ～50 eV, corresponding to a fraction of 1/6 to the temperature near the pedestal top, while the density (~3×10 ¹⁹ m ^-3) of these filaments could be approximate to the line-averaged density. In addition, associated magnetic fluctuations have been clearly observed at the same time, which show good agreement with the density perturbations. A localized current on the order of ～100 kA could be estimated within the filaments.     

广西思荣地区碳酸锰矿找矿潜力初探

广西思荣矿区以往勘查工作仅对地表堆积型锰矿及近地表淋积型锰矿开展少量的普查,深部揭露很少,工作程度低,经综合分析地质特征及以往工作情况,认为该地区深部具有寻找碳酸锰矿的良好潜力。