Prevention of rockburst by guide holes based on numerical simulations

We studied variations in the stress field around guide holes drilled during tunnel excavation to understand the mechanical mechanism by which these holes help prevent rockburst. The study used elasto-plastic analysis of a circular chamber under non-axisymmetrical loads. The results showed that the unloading of in-situ stresses, and the forming of a secondary stress field, leads to a severe change in the stress field around the guide holes. This causes the formation of an X-shaped area of plastic deformation, which prevents the rockburst. Adopting a sub-model finite dement technique, we analyzed the factors that influence the distribution of the plastic area, such as the guide hole distribution and the in-situ stress state. The calculations showed that higher initial stresses result in greater adjustment to the stress field. When the stress concentration is greater the size of the plastic area surrounding the guide hole is larger. A multi-row distribution of the guide holes shaped like a quincunX can increase the interconnectivity of the plastic areas and allow the plastic area to extend from the tunnel wall deep into the surrounding rock. An optimized design was put forward based on the distribution of the plastic area around guide holes and the factors that influence it.     

Relation between structural evolution of the Longmenshan orogenic zone and sedimentation of its foreland basin

In order to determine the area for oil and gas exploration in China's north Sichuan basin, we have divided the time during which the Longmenshan foreland basin was formed into five periods, based on the sedimentary response relationship of the fore-land basin to structural evolution: 1) a late Triassic Noric period; 2) an early-Middle Jurassic period; 3) a late Jurassic to early Cre-taceous period; 4) a late Cretaceous to Paleogene-Neogene period and 5) the Quaternary period. As well, we analyzed the sedimen-tary environment and lithologic features of every basin-forming period. The results show that there are several favorable source-reservoir-cap assemblages in our study area, making it a major region for future oil and gas exploration in China's northern Sichuan basin.     

周期阵列压痕奇异应力场与开裂（PartⅡ：压痕开裂临界载荷）

周期阵列压痕方法是研究微观摩擦学的工具之一。由于周期阵列刚性压头压在半平面弹性体的表面时,会产生周期的Ⅰ型奇异压应力场,该奇异应力场的应力集中达到一定程度时,即达到临界条件时,该奇异应力场所在的边界将开裂。压痕边界的开裂问题是一个新型的断裂力学问题,通过边界移动的能量释放率的分析给出了压痕边界开裂能量释放率数学表征,并给出边界开裂的临界载荷和临界开裂角。     

复合掺杂Nd（III）和Zn（II）非晶态Ni（OH）2电极活性材料的制备及其表征

以NiSO4、ZnSO4和Nd（NO3）3为原料,采用共沉淀快速冷冻法制备出了复合掺杂稀土Nd（III）和Zn（II）的非晶态氢氧化镍粉体材料。测试发现：样品材料微结构无序性强,结晶水含量较高。将样品材料制备成镍电极并组装成MH—Ni电池,在80mA／g恒电流充电5．5h、40mA／g恒电流放电、终止电压为1．0V的充放电制度下,复合掺杂6％Nd（III）和6％Zn（II）样品材料电池的放电平台为1．2624V,放电比容量为343．12mAh／g,远高于目前应用的B-Ni（OH）2电极活性材料的放电比容量。     

基于图像的静脉输液无液检测的新方法

针对国内外为实现静脉输液无液自动检测而采用的各种传感器技术存在的各种问题,提出基于图像的静脉输液无液检测的新方法.通过CCD摄像机采集输液器液位图像,数字化后输入计算机,由计算机软件进行图像处理和分析,得到输液器是否无液的信息.该方法的研究,实现了将数字图像处理技术融合到静脉输液无液检测应用中,丰富了图像处理内容的同时为静脉输液无液检测提供了新思路.     

青岛财富中心超限高层Pushover分析

青岛财富大厦是一座复杂的超限高层建筑.设计除利用SATWE程序及ETABS和ANSYS有限元分析程序进行弹性和弹塑性计算分析外,还对结构进行了静力弹塑性分析（Pushover Analysis）.研究表明：静力弹塑性分析方法在超限高层结构设计中,由于受高振型的影响,虽然理论上会存在一定的误差,但是通过Pushover分析可以从宏观上发现结构在罕遇地震作用下的破坏机制,从而对可能存在的薄弱部位进行有针对性的加强,提高结构可靠度.     

旋流板塔煤浆法烟气脱硫研究

煤浆法烟气脱硫是以煤浆洗涤含二氧化硫的烟气,二氧化硫溶于浆液形成亚硫酸,煤中黄铁矿与亚硫酸、氧气发生反应,亚硫酸被氧化为硫酸,从而实现烟气脱硫.反应过程中,煤中的黄铁矿硫也被转化为硫酸而浸出,反应产生的Fe3＋/Fe2＋又对脱硫反应起到了催化剂的作用.以旋流板塔为吸收设备,研究了煤浆法烟气脱硫过程中浆液温度、液气比、空塔气速及浆液固液比等操作参数对脱硫率的影响规律.试验表明,在其他条件不变的情况下,适当提高液气比、空塔气速及浆液固液比均有利于提高脱硫效果.随着烟气脱硫过程的进行,脱硫浆液中的总铁含量不断增加,说明煤中黄铁矿被不断浸出,故此法在脱除烟气中的二氧化硫的同时也降低了煤中黄铁矿硫含量.     

联合约束无线传感器网络连通支配集算法

针对无线传感器网络连通支配集构建问题,基于(α,β)-tree定义了具有传输时延约束的连通支配树CDTT问题,并提出CDT算法构建有限总功率消耗的CDT-tree,同时符合传输时延约束要求。给出的分布式CDS算法分为两个阶段执行,首先基于单位圆图构建MIS,然后在双权值无向图上使用MST和SPT实现CDT算法,同时满足联合约束要求,具有O(n2)的时间和消息复杂度。理论分析和仿真结果表明提出的算法能正确地解决CDTT问题,构建联合约束的CDS。