Feasibility study on optical vortex generation at Shanghai deep ultraviolet free-electron laser

Coherent light with orbital angular momentum （OAM） is of great interest. Recently, OAM light generation by coupling a relativistic electron beam with a Gaussian mode laser pulse at the high harmonics of a helical undulator has been demonstrated experimentally. In this paper, the possibility of delivering coherent OAM light at the 3rd harmonic of the Gaussian mode seed laser is discussed for the Shanghai deep ultraviolet free- electron laser （SDUV-FEL）. Considerations are given on the experiment setup, the expected performance and the possible measurement method.     

某水泥熟料线工程深层平板静载荷试验研究

针对某水泥熟料线工程进行的深层平板静载荷试验研究，与室内试验对比，阐明了静载荷试验的必要性，避免了因地勘部门提供的承载力偏低而造成工程的浪费。     

逆筑法在软土质地区进行深基坑开挖的应用

扬州六圩污水处理厂二期工程建设于地势平坦的河漫滩地,土层分布复杂,因污水处理工艺需要,需建设深度达9.05 m的粗格栅间和进水泵房。经方案比选,最终确定采用逆筑法进行泵房深基坑的开挖。详细介绍了逆筑法在这一特定土质条件及较小平面范围内实施较深基坑开挖的成功案例,并通过比较排桩及逆筑拱墙两种不同的支护形式,分析了逆筑法在支护工程中独特的优势。     

钻孔灌注桩和深层搅拌桩组合的应用

结合钻孔灌注桩和深层搅拌桩组合在具体工程中应用的实例，重点阐述了深基坑支护方案设计、施工方案制定及现场应急和监测措施，通过基坑支护方案的有效实施，从而达到了预期的效果。     

浅谈潮州供水枢纽工程深厚软基河床截流应用技术

广东省潮州供水枢纽西溪截流集"深厚软基河床、水流条件复杂、大流量、高落差、大流速"于一体,综合截流难度在国内外比较罕见,西溪截流的成功,丰富了我国大江大河截流的理论与实践.工程在截流实践中为达到保砂、透水、护底、防冲目的而采取的护底结构,应用效果良好,值得在其他类似工程的截流实践中进一步推广.     

Determination of dissolved natural thorium and uranium in Horonobe and Mizunami Underground Research Laboratory groundwater and its thermodynamic analysis

At two underground research laboratories situated at Horonobe and Mizunami, Japan, trace amounts of natural thorium and uranium dissolved in deep groundwater were investigated with the help of chemical pre-concentration method. The groundwater was sampled from underground boreholes under the geochemical condition of no atmospheric exposure, and the colloid contribution was checked by in situ two size-fractionated ultrafiltration systems. A rough decrease by half in the concentration after in situ filtration suggested the presence of natural colloids and suspended matter that were carriers of a portion of the elements. The Th and U concentrations in groundwater after 10 kDa filtration was evaluated as dissolved species, and was identified thermodynamically using existing hydrogeological and geochemical data, such as the mineral components in the groundwater at a given pH, ionic strength, concentration of co-existing ions, redox potential, and a hypothetical solubility-limiting solid phase. The crystalline solid phase of tetravalent thorium and uranium dioxides made the solubility very low compared with that of the amorphous phase.     

VENTEC深孔钻系统在C620上的成功应用

论述了英国哈镘公司(HAMMOND)生产的HD3000型VENTEC深孔钻系统在C620上的成功应用经验,对VENTEC深孔钻系统的构成、工作原理、在车床上的安装以及系统在使用过程中易产生的各类故障等问题进行了分析总结和详细论述。     

Prozessmodell zum Einbringen von Eigenspannungen durch Festwalzen

Defects in axles lead to a significant reduction of lifetime. Deep rolling provides a simple way to prevent crack growth emanating from defects or at least to slow down the crack growth rate, provided the flaw size does not exceed the size of the zone affected by the compressive residual stresses. In this work, a simple process model is presented for estimating the penetration depth of compressive residual stresses from deep rolling.     

2012年全球上游油气并购市场分析及展望

受多起大型并购交易推动,2012年全球上游油气并购交易金额超过2500亿美元,创历史最高水平,但交易数量不增反降。美国和加拿大是全球交易价格最高的地区,非洲和中亚俄罗斯地区交易价格相对较低。北美和中亚俄罗斯地区是全球上游资产并购最活跃的地区,亚太、东非和西非的交易活动也明显活跃。交易方式主要是现金收购或股权和资产置换类交易。2012年全球上游油气并购规模大,页岩油取代页岩气成为交易最活跃的非常规资产,东非和西非因连续获得海上重大发现而逐渐成为交易热点地区,亚洲国家石油公司成为油气并购市场最大买家,国际大石油公司继续剥离边际和成熟资产,将收购重点放在页岩油和深水领域。展望2013年,大型公司并购和以非常规资产为主的资产交易将推动市场成交金额维持在较高水平,可能会有更多的非石油资本进入油气行业,亚洲石油公司还将继续进行大型并购。非常规资产仍然是市场的热点,但因气价因素影响,页岩气资产可能降温,页岩油资产交易活跃的趋势将延续。东非、西非地区在全球油气并购市场中的地位将有所上升。     

孙村煤矿矿井废弃物处理及综合利用

为降低孙村煤矿开采对环境的污染,充分利用地热,采用水源热泵机组取代传统的燃煤锅炉,满足了冬季立井井口、生产车间和办公室的采暖要求;矿井废水经净水器、石英砂过滤器、活性炭过滤器、反渗透设备处理后,矿井水质达到国家Ⅰ类饮水标准;采用仰斜似膏体充填开采技术,将水泥、粉煤灰、煤矸石加水配制成质量分数72%～75%的胶结充填料浆,在采场进行充填,整个充填系统的充填能力达到100～120m3/h,提高了煤炭资源采出率,减少了地面矸石山。以上措施不仅显著改善了地面环境,而且实现了能源的再利用。