钢筋混凝土基础拆除爆破实践

卅亩地选矿厂1#球磨机传动基础产生了裂缝,拆除爆破中通过试爆调整炸药量与布孔参数,使用药与布孔问题趋于合理,并采取一定的技术措施解决了裂缝爆破漏气问题,同时还对特殊情况下的震害传播问题作了探讨。     

变电站屏蔽电缆端口的雷电感应电压计算方法

变电站内屏蔽电缆容易受到雷电干扰,严重时会造成端接设备损坏,有必要开展电缆端口的雷电感应电压计算研究。基于电磁骚扰的耦合路径分析,提出了依次求解电缆屏蔽层响应和电缆内部响应的耦合分析步骤。对于电缆屏蔽层响应,指出了基于地电位差的传导耦合分析方法和基于空间磁场的感应耦合方法的不足,提出了基于电磁散射理论的更一般的分析方法;对于电缆端口响应,提出了基于转移阻抗和转移导纳的分布激励源的传输线计算方法。通过典型算例,计算了屏蔽电缆单端接地和双端接地时端口雷电感应电压,计算结果表明电缆屏蔽双端接地比单端接地具有更好地雷电屏蔽效果。     

姬塬油田长6油藏富集规律研究

鄂尔多斯盆地延长组沉积时为一大型内陆淡水湖盆,长6沉积时湖盆开始收缩,物源供给充足、砂体发育,是中生界主要的储集体之一.随着姬塬油田近年来快速高效建产,长6油藏目前已成为主力建产层位,具有良好的开发前景,是实现储量良性接替的重要资源基础.     

利用随机模型建模分析特高压交流输电线路的无线电干扰特性（英文）

For developing ultra-high voltage(UHV) AC power transmission systems,it is important to precisely estimate and to limit the radio interference(RI) level of power lines.Based on the stochastic characteristics in amplitude and repetition rate of induced corona current,by using the probability theory and mathematical statistics,we establish a stochastic model for the wide-sense stationary random process of corona discharges.Then combining the stochastic model with model-propagation-analysis method,the RI levels under three-phase UHV AC transmission lines are calculated.The results of the calculation based on stochastic model method and International Council on Large Electric Systems(CIGRE) excitation function are compared with that based on semi-empirical method and some other excitation functions.The stochastic model based on different excitation functions is also adopted to simulate the RI levels under finite test lines with two opened terminations.The results indicate that with the same average maximum gradient on conductor surface and the same conductor type,the number of corona discharge per unit length is one of the main reasons that causes the difference between different excitation functions.It is also concluded that for a long test line,the effect of standing wave on RI field strength is negligible in the middle of the line,but obvious near both terminations: for a 10-km line,the maximum difference in RI field strength is 2.78 dB,between the peak value of the standing wave near the ends and the steady value near the middle of the line.     

特高压输电线路无源干扰研究进展（英文）

Reradiation interference(RRI) from ultra high voltage(UHV) power lines has become a hotspot for researches in electromagnetic(EM) interference between UHV power grids and adjacent radio stations.The mechanism of RRI,numerical simulations,methods of protecting distance calculation,and resonance characteristics of RRI are reviewed in this paper using results of works reported by IEEE and Chinese publications.We conclude in this review that RRI at short and medium wavelengths can be simulated using method of moment(MoM) and two commonly used models,the wire model and the surface model,which have different applicable conditions.We indicate that the accurate simulation of RRI at higher frequencies using uniform geometrical theory of diffraction is still beyond our capability because it requires studies of the relative simulation methods.We also suggest that further researches of the mechanism of RRI and the prediction of resonance frequencies above 1.7 MHz are necessary for dealing with the interference between the existing power lines and radio stations because resonance frequencies proposed by IEEE are less than 1.7 MHz.     

直流输电线路对地磁场Z分量观测干扰的校正

为减小直流输电线路对地磁场观测的干扰,采用数学计算的方法精确求解了线路对地磁Z分量的干扰水平。以观测点为原点建立了地磁仪器观测点坐标系,推导了观测点坐标系各坐标轴在地心坐标系中的单位矢量表达式。根据空间矢量点积的定义,得到了空间电流磁场矢量投影到地磁Z分量方向的求解公式。利用推导的公式和直流线路电流磁场三维计算模型,最终求得直流线路对地磁Z分量观测的干扰水平。由此,开发了"直流线路对地磁观测干扰校正系统",并开展了地磁台站和野外联合地磁观测干扰实验。结果表明,直流线路和地磁观测台站距离不超过10km时,提出的数学模型和计算方法误差不超过5%。     

特高压交流试验示范工程GIS隔离开关带电操作试验

为验证我国特高压交流试验示范工程金属封闭开关设备(gas insulated switchgear,GIS)中隔离开关带电操作的安全性,在长治、南阳和荆门变电站对所有特高压GIS隔离开关进行了带电操作试验。在前期特高压GIS和复合型气体绝缘金属封闭开关设备(hypid gas insulated switchgear,HGIS)中特快速瞬态过电压(very fast transi-ent overvoltage,VFTO)实测研究基础上,开展现场典型运行方式下隔离开关带电操作,监测产生的VFTO和暂态壳体电位(transient enclosure voltage,TEV)。试验初步得出了特高压变电站实际VFTO和TEV水平及分布,结果表明:特高压GIS隔离开关的带电操作是安全的,但应注意产生的TEV对二次设备的影响,阻尼电阻能够有效抑制VFTO和TEV。带电操作试验的开展为今后特高压GIS隔离开关的带电操作提供了依据。     

4-氯-2-氰基-5-(4-甲基苯基)咪唑的合成研究

以对甲基苯乙酮为起始原料,经二氧化硒氧化制得4-甲基苯基乙二醛,在水与甲醇的混合溶剂中,与盐酸羟胺、乙二醛水溶液环化反应得4-羟基-5-(4-甲基苯基)-2-肟基次甲基咪唑-3-氧,再以N,N-二甲基甲酰胺为溶剂,与二氯亚砜反应脱水氯化得标题化合物,总收率69.0%。     

硅熔体弯曲液面附加压强计算及齿状坩埚参数设计

提出了具有齿状结构的坩埚设计方案,通过计算硅熔体弯曲液面的附加压强得出相应的计算模型。结果表明,此模型计算出采用良好涂层的齿状坩埚所需的齿状夹角较小,该特性使设计并制造齿状坩埚存在一定的技术难度。最后由该计算结果进一步解释了硅液溢流的现象和原因。     

麻婆豆腐菜用调味料生产工艺

采用固态、固液结合态方法生产麻婆豆腐菜用调料 ,对麻婆豆腐复合调料的工艺进行了研究。