高硅石灰石在水泥生产中的应用

宁夏赛马实业股份有限公司自备矿山中,有3000万t的高结晶硅石灰石因其对粉磨和煅烧的不利,影响一直没有得到利用。2003年新建2×2500t/d生产线时,该公司从粉磨设备选用,燃烧器选择,配料方案探索等多方面着手,在新线上实现了高硅石灰石的合理利用。     

气化炉锥底砖、激冷环与下降筒的损毁与解决对策

针对国产化大氮肥水煤浆气化炉中锥底砖、激冷环和下降筒使用过程中出现的问题,分析了损毁原因,分别从技术改进、工艺操作和设备管理等方面提出了相应的解决对策,可以不同程度地延长锥底砖、激冷环、下降筒的寿命。     

竖向荷载作用下斜桩承载特性数值分析

近年来,斜桩在桥梁、码头、海上钻井平台及大型输电线路塔架基础等工程中得到广泛应用,研究不同倾角斜桩的荷载传递及承载特性实用意义较大。基于ABAQUS软件,考虑桩土接触特性,模拟分析了不同倾角斜桩的承载特性。结果表明:桩身倾角不大于10°时,倾斜角对单桩的极限承载力影响不大,但会在桩身产生一定弯矩以及桩顶产生一定的水平位移;桩身轴力沿桩长方向的衰减速率随桩身倾角的增大而增大;斜桩桩身弯矩主要分布在桩顶下1/2桩长范围内,其最大值的位置不受桩身倾角以及桩顶竖向荷载的影响;斜桩桩身侧摩阻力沿桩长大致呈"S"型分布,其桩顶以下1/6桩长范围内侧摩阻力远远大于直桩。     

静压桩终压力及单桩竖向承载力的相关性

以苏南软土地区的静压桩施工实测资料为依据,着重分析了静压桩的终压力与单桩竖向承载力之间的相互关系,并按照静压桩的入土深度,提出两者之间的相关性估算方法,为静压桩的安全、合理施工提供参考。     

Integrated fertilizer requirements of groundnut-wheat cropping system

Investigations were carried out in a long term field experiment from 1976 to 1982, on a loamy sand soil to find out the fertilizer requirements of groundnut and wheat grown in fixed rotation. Application of 26 kgP/ha to wheat alone was found to be sufficient for both wheat and succeeding groundnut. Application of phosphorus to both wheat and groundnut did not result in extra beneficial effect over P application to wheat alone. However, application of 26 kg P/ha to groundnut alone was not sufficient for succeeding wheat. There was no response from K application (25 kg K/ha) in either of these two crops. Increasing the dose of N from 50–150 kg/ha to wheat significantly increased the grain yield of wheat but the pod yield of succeeding groundnut were markedly lowered. Response of wheat to 150 kg N/ha was more marked when P was also applied to wheat and response was less when P was applied to preceding groundnut alone. Zinc application at 6.25 kg/ha to wheat alone resulted in significant increase in grain yield of wheat and pod yield of succeeding groundnut.     

Comparing the revised NIOSH lifting equation to the psychophysical,biomechanical and physiological criteria used in its development

The purpose of this study was to perform a systematic and comprehensive comparison between the recommended weights of lift (RWL) from the revised NIOSH lifting equation, and the specific biomechanical, psychophysical and physiological criteria that were stated to be used in the equation's development. A composite acceptable load (CAL) table was developed for the 216 conditions presented in the female lifting table of Snook and Ciriello (1991). Each CAL value was calculated to correspond to the most conservative load of the three design criteria. The RWLs caused lumbar compression forces close to the biomechanical limit of 3400 N for lifts below knuckle height, but resulted in compression forces that are much lower at higher lifting heights. At moderate lifting frequencies, the average RWL would be acceptable to more than 95% of female workers according to the psychophysical criterion. At the highest frequencies, the RWL was found to be an average of 63% of the CAL values based on the integration of the psychophysical and physiological criteria. It is recommended that ergonomists acknowledge the very conservative nature of the revised NIOSH lifting equation when using it to evaluate occupational lifting tasks.     

物料在竖直管道中的流动和堵塞原因分析

介绍了竖直管道中气力输送物料过程各种不同参数的关系以及物料在管道中发生堵塞的原因，给出了预测堵塞发生的计算方法，为物料气力输送系统的设计提供了一些借鉴。     

DFRM2650磨系统调试

立磨系统的调试,是先空载调试,即先对各系统(如主减速机润滑站系统、磨辊加压站系统、磨辊润滑站系统……)进行调试正常后,才进行负荷调试。磨机负荷试运行阶段,主要探索使系统稳定运行的系统风量、磨机压差、入磨气体压力等工艺参数的控制。长沙河田白石水泥有限公司1200t/d生产线配套的DFRM2650立磨,经调试实现正常稳定运行的系统工艺参数为:系统风量大于120000m3/h,磨机压差6000～8500Pa,入磨气体压力615Pa左右,出磨气体温度5～8MPa。     

柔性标签弯曲及对RFID系统识读距离的影响研究

针对平面结构标签在使用过程中经常发生弯曲形变的问题,研究一种柔性标签发生圆弧形弯曲和垂直折叠形变时天线性能的变化以及对RFID系统识读距离的影响。介绍柔性标签天线的研究现状,分析影响RFID系统识读距离的关键因素,通过示意图阐述弯曲天线模型的建模方法,基于HFSS仿真分析阻抗、增益和辐射效率等的变化规律。通过实际测量验证了RFID系统识读距离的仿真结果及该方法的可行性。     

印刷哈萨克斯拉夫粘连字符的切分方法

哈萨克斯拉夫图像文本经过行切分和列切分后,存在水平方向接触和垂直方向重叠的粘连字符。为提高字符识别率,依据字符连通域的最小外接矩形切分开垂直方向重叠的粘连字符图像块;利用判决条件:字符宽度概率密度分布图、字符图像块垂直投影的波峰数目和字符图像块垂直投影波峰的对称性,分离初始粘连字符图像块中正确的单个字符图像块和实际接触的粘连字符图像块;在允许的字符宽度范围内,寻找粘连字符图像垂直投影图的极小值点,以切分实际接触的粘连字符。实验结果表明,该方法泛化能力较好且识别率有明显提高。