论辊压磨的技术经济效果

年产１７～２０万吨或大于２０万吨水泥的工厂，辊压磨用于粉磨水泥或原料是经济合理的。但用于１０万吨及其以下的水泥厂，技术经济方案比较表明，是不经济的，用于粉磨矿渣水泥或粉煤灰水泥，会降低它的经济性，并应使矿渣和粉煤灰直接喂入磨机而不喂入辊压磨。     

基于神经网络的智能控制在水泥生料配料中的运用

本文根据水泥生料配料的工艺要求，将一种神经网络的控制系统运用于生料配料，对于难以建立数学模型的控制系统提供了有效的方法。     

定向井水泥环力学完整性研究

国内外针对定向井水泥环力学完整性失效分析的研究比较少,通过待定系数法建立了定向井在非均匀地应力下的套管-水泥环-地层应力分布模型,并通过调研国内外关于水泥环理想完整性失效的几种形式,结合对应的失效准则,提出了定向井水泥环力学完整性失效分析的研究思路.不同于井壁稳定问题,水泥环位于套管和地层岩石之间,其所受既有正应力又有剪应力,其剪切塑性破坏和拉伸破坏分析必须在主应力空间下进行,研究结果对于分析定向井水泥环固井设计具有一定的指导意义.     

An analysis of interplanetary sources of geomagnetic storm during November 7–8, 1998

We analyzed the properties of the solar wind appeared during November 7–8, 1998. Results show that the spaceship ACE spotted a shock （hereinafter referred to as the first shock） at 07:33 UT, November 7. The sheath appeared from the first shock to 22:00 UT November 7. A magnetic cloud-like （MCL） was observed during the period from 22:00 UT November 7 to 11:50 UT, November 8. Another shock was observed at 04:19 UT, November 8 （the second shock）. It is apparent that the second shock has entered the rear part of the MCL （MCL₂）, though the former part of the MCL （MCL₁） was not affected by the second shock. The main phase of the geomagnetic storm is split into three steps for the convenience of SYM-H index analysis. Step 1 covers the period from the sudden storm commence （SSC） at 08:15 UT, November 7 to the moment of 22:44 UT, November 7. Step 2 starts from 22:44 UT, November 7 and ends at 04:51 UT, November 8. The last step runs from 04:51 UT, November 8 to 06:21 UT, November 8. Step 2 has played a key role in the main development phase of the geomagnetic storm. Analysis of the solar wind properties associated with the main phase shows that the three steps in the main phase have sheath, MCL₁, and MCL₂ as their respective interplanetary source. Specifically, the sheath is covered by the solar wind data from 07:33 UT to 22:00 UT, November 7, MCL1 by the solar wind data from 22:00 UT, November 7 to 04:19 UT November 8, and MCL₂ by the solar wind data from 04:19 UT to 05:57 UT, November 8. MCL₁ had a strong and long lasting so UTh directed magnetic field, allowing it to play a key role in the development of the main phase. MCL₂ made a much smaller contribution to the main development phase, compared with MCL₁.     

提高水泥混凝土路面平整度的工艺措施

水泥砼路面平整度的好坏直接影响路面的使用质量和行车的舒适性,因此提高其平整度问题便成为施工控制关注的重点,文章论述了影响水泥砼路面平整度的因素及提高路面平整度的施工工艺。     

注浆水泥代用材料在丁集矿井巷道充填加固中研究与应用

丁集煤矿煤层埋藏深,巷道地压大,显现快。为提高巷道的抗压性,巷道进行注水泥浆作为充填和加固材料,效果显著,但成本大。为降低成本,合理选用材料,使用多种材料进行试验。试验证明,黄石粉与水泥配比代替纯水泥作为注浆加固、充填材料,效果显著,工程费用降低。     

CO2埋存井注入过程中水泥环应力完整性研究

CO2埋存井固井水泥环完整性直接涉及到CO2能否安全、长期有效的进行地质埋存,因此对埋存井水泥环完整性的分析是很有必要的。提出了CO2埋存井水泥环动态应力完整性模型,并分析了温降、地层孔隙压力的变化对水泥环应力完整性的影响。结果表明:温降和孔隙压力的增大均能对水泥环产生轴向诱导拉应力,温降和孔隙压力单独作用时,不足以使水泥环受拉而发生破坏。两者同时作用时,当温降和孔隙压力增加到一定值就会使水泥环发生轴向断裂。产生水平裂纹,所以为了保证水泥环完整性不发生破坏,在注入CO2时,要正确的处理好CO2的注入温度与注入速度的关系。