DX centers in AlxGa1-xAs bulk alloy,AlAs/GaAs ordered,and disordered superlattices

Properties of theDX centers in Al_0.5Ga_0.5As bulk alloy (b-AL), (AlAs)₂ (GaSa)₂ ordered superlattice (o-SL) and (AlAs) _m (GaAs) _n disordered superlattice (d-SL) (m = 1, 2, 3,n = 1, 2, 3) with the same macroscopic composition were measured and compared. By deconvolution of deep level transient spectroscopy (DLTS) spectrum due to theDX center, we have found a decrease in the number of separate peaks in DLTS spectrum in an intentionally atomic ordered arrangement. Visiting Scholar of the Japan Society for the Promotion of Science. On leave from Department of Electrical Engineering, San Jose State University, San Jose, California 95192-0084, USA.     

Three-dimensional stability analysis of the dam foundation at Baise

It is usually difficult to determine the actual safety factors of rock masses in an ordinary two-dimensional stability analysis if the safety factors of the different cross sections in the rock mass vary significantly. In addition to the actual slope, arch dam abutment, and the actual foundation of a high building, another example is that the different cross sections of the foundation in the monolith of a gravity dam vary significantly, just like the condition at the overflow dam in the Baise project. A three-dimensional stability analysis method based on the upper-bound theorem was employed to solve this problem. The parameters used in the analysis were obtained from geomechanics tests, as well as continuity simulations of the randomly distributed joints. Two failure patterns against sliding are analyzed. One pattern is the foundation slide along deep-seated planes which were determined by calculations. The other pattern is the foundation slide along the planes across the bottom of the high steps in the foundation pit. The results indicate that a special overflow dam monolith can be considered to be safe in case of considering the three dimensional effect. However, a key wall with a depth of 5m must be constructed at the upper side of this monolith in order to ensure the safety of the foundation. Translated from Chinese Journal of Rock Mechanics and Engineering, 2006, 25(3): 533–538 [译自: 岩土力学与工程学报]     

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本文介绍了陕北气区陕35井第一次下光油管(即不带封隔器)酸化的施工情况,并结合该地区的地层压力特征分析了光油管酸化施工的可行性及应用限度。     

临海抛石回填地质条件下的深基坑围护技术

临海抛石回填和海沙冲填复杂地层，具有高透水性的特点，尤其受潮汐影响地下水位变幅明显。青岛奥运会国际帆船中心地下车库工程，采用放坡开挖，坡面挂网喷射混凝土保护，高压旋喷注浆穿透抛石层形成止水帷幕等技术措施．有效地解决了4．5m高潮汐落差情况下的基坑止水问题。     

滤失控制与变粘酸深穿透酸压工艺技术的应用

酸滤失是制约酸蚀缝长延伸的重要因素之一,滤失控制是深穿透酸压工艺成功与否的关键所在。概述了酸滤失的特征及其控制技术的发展过程,着重介绍了90年代末引进国内投入现场应用的变粘酸技术。国内外实践表明变粘酸比目前普遍使用的胶凝酸体系液体效率更高,增产效果更理想,该技术的引进和国产化必将促进国内油气田深穿透酸压工艺技术水平跃上一个新台阶。     

深基坑管井降水理论的实际应用

本文从工程实际出发,诠释了泰斯公式在具体工程上的应用条件和环境,并运用了工程实际,收到了较好的效果。     

有机硅丙烯酸酯增深剂的制备及应用

由乙烯基三乙氧基硅烷与KH-550、丙烯酸酯类单体在阴/非离子表面活性剂存在下，通过乳液聚合制得带蓝光的半透明有机硅丙烯酸酯乳液．该乳液粘度小，有机硅质量分数15％，总固体质量分数30％，该增深剂既可单独使用，也可与氨基硅油乳液复配，经蓝色16电力纺、黑色03双绉等真丝产品增深，其增深度可达15％，但亲水性有所下降．     

浅议超深孔钻孔灌注桩施工工艺

结合工程实例，浅议超深孔厚砂层钻孔灌注桩施工工艺。根据地层特点及设计要求，选用、优化钻头结构和钻进参数。．     

金属矿山深热矿井空气温度的灰色预测

金属矿山深热矿井气温的预测计算是一个难题，本文探讨了应用灰色系统预测理论来解决这一难题的新途径，并通过实例验证了该方法的可行性和有效性。     

Accurate measurement of capture cross sections in deep level transient spectroscopy: Application to EL2 in GaAs

A rigorous formulation of capacitance changes during trap filling processes is presented and used to accurately determine the electron capture cross section of EL2 in GaAs at a particular temperature, 377K, in this case. The value, σ_n (377K) = 2.7 × 10⁻¹⁶ cm², is compared with that predicted from the emission dependence.