注水井投球调剖工艺的理论与实验研究

报道了本课题中5个方面的研究结果。①将注水在炮眼附近的流场看作大空间内细支管的向外射流，简化为二堆问题。数值求解注水的控制方程，得到了主管流速一定、支管流量比不同时的若干射流流场。指出了流场特点，表明此调剖方法是可行的。②给出了调剖球在注水中所受8种力的表达式，由力值量级比较认为，在实际条件下重力、惯性力、广义浮升力、附加质量力和粘性阻力是主要作用力，而Basset力、Magnus力和saffman力可忽略。③剖析了调剖球在注水管、井筒、油套环空流动和被炮眼吸附时的运动状态。④讨论并计算了调剖球在注水中的运动轨迹。给出了球直径、密度、炮眼流量比、球初始位置影响封堵的二维图示。⑤简速了在包含3个吸水层、总质量流量为5t／h的模拟实验装置上测得的各层堵球数、堵球概率和分流量与投球数的关系，给出了一个调剖球封堵底层炮眼的实测运动轨迹，验证了该条件下炮眼附近的流场。图20参9。     

高阻力支架的电液控制在近距离煤层的应用

本文针对西铭矿近距离赋存的9#煤层49407工作面顶板控制困难的情况,对工作面液压支架进行选型验算,并采用液压支架电液控制技术,经现场试用后不仅能够有效控制工作面顶板,还可以实现控制台远程监控,达到了工作面安全高效生产的目的,具有一定的经济技术效果,可以推广应用到本矿类似条件的9#煤层工作面生产当中。     

致密砂岩油藏压裂投产水平井产能分析

针对致密砂岩油藏压裂投产水平井生产过程中,储层渗流场复杂的问题,在前人工作的基础上,利用井筒与油藏耦合模型,对模型中的裂缝流动压降进行修正,同时综合考虑储层启动压力梯度和应力敏感对产能的影响,推导出适合致密砂岩油藏压裂水平井的产能方程。研究结果表明,致密砂岩储层的启动压力梯度和应力敏感对水平井的产能影响显著,同时计算结果显示,推导的产能方程预测结果准确,能够指导水平井的开发。     

应用运动控制模块PP41实现位置闭环控制

基于松下FP2-PLC和运动控制模块PP41,采用步进电机和编码器方式实现了位置的闭环控制,将三轴的轴向位置精度控制在0.5μm以内。使位置闭环系统能够在低成本下实现。     

Effects of Sn-doping on morphology and optical properties of CdTe polycrystalline films

Sn-doped CdTe polycrystalline films were successfully deposited on ITO glass substrates by close space sublimation. The effects of Sn-doping on the microstructure, surface morphology, and optical properties of polycrystalline films were studied using X-ray diffraction, scanning electron microscopy, and ultraviolet-visible spectrophotometry, respectively. The results show that the lower molar ratio of Sn and CdTe conduces to a strongly preferential orientation of (111) in films and a larger grain size, which indicates that the crystallinity of films can be improved by appropriate Sn-doping. As the molar ratio of Sn and CdTe increases, the preferential orientation of (111) in films becomes weaker, the grain size becomes smaller, and the crystal boundary becomes indistinct, which indicates that the crystallization growth of films is incomplete. However, as the Sn content increases, optical absorption becomes stronger in the visible region. In summary, a strongly preferential orientation of (111) in films and a larger grain size can be obtained by appropriate Sn-doping (molar ratio of Sn : CdTe = 0.06 : 1), while the film retains a relatively high optical absorption in the visible region. However, Sn-doping has no obvious influence on the energy gap of CdTe films.     

延时反馈闭环发射分集的上限性能分析

本文分析了仅反馈信道统计参数时闭环发射分集系统的误比特率性能,然后计算不同多普勒频移和反馈时延时,反馈信道状态信息时系统的误比特率性能,并根据信道参数预测的性能上界,指出在快衰落信道下,信道参数预测是一个值得研究的方向.     

近空间升华沉积CdTe薄膜的微结构和PL谱

用近空间升华法在CdS薄膜上沉积了CdTe薄膜.研究了在两种保护气氛下所沉积的多晶CdTe薄膜在后处理后的微结构、表面形貌及光致发光(PL)谱,并研究了CdTe表面和CdS/CdTe界面的PL谱的区别,根据薄膜的微结构对碲化镉在太阳电池中的应用进行了讨论.     

岳南煤业南翼回风大巷支护技术与实践

岳南煤业将南翼回风大巷地质条件与自然平衡拱理论结合,运用理论计算得出锚杆的主要支护参数,提出南翼回风大巷的支护设计方案,并设置监测点进行现场监测,结果表明顶底板移近量稳定在140 mm,两帮移近量稳定在150 mm,取得了较好的支护效果,实现了较好的技术和经济效益。     

Macrotexture influence on vibrational mechanisms of the tyre–road noise of an asphalt rubber pavement

The road surface is one of the most important factors that have influence on the current traffic noise. Usually, for dense surfaces, impacts of the tyre on the pavement generate vibrations which are the dominant mechanisms in the tyre–road noise. In this study, the effect of muffling these vibrations, by the incorporation of crumb rubber (CR) from wasted tyres into asphalt pavements, has been evaluated acoustically. Close proximity measurements have been carried out to register the sound emission generated in the contact zone between a reference tyre and an experimental asphalt pavement with CR. The analysis of the measurements indicates that the incorporation of CR as well as the air voids content has less influence than the macrotexture of the road surface on the acoustical behaviour of this experimental asphalt pavement.     

浅谈相邻建筑物地基沉降影响的处理

从新旧建筑物的强度、刚度、结构类型、地质情况、荷载大小等方面分析了相邻建筑物地基沉降的影响因素,列举了相邻建筑物沉降的有关数据,提出了不同类型结构的处理方法,以避免地基沉降造成的房屋损坏。