C波段微型光源研究

应用二氧化碳激光熔融法加工掺铒光纤顶端,依靠表面张力在光纤顶端形成球形度较高的掺铒微球腔。室温下测量熔融法制备的尺寸为21μm的掺铒微球,通过精确调节掺铒微球的位置使980nm的泵浦光照到合适的位置,得到了铒离子能级跃迁单一模式的荧光谱线,中心波长在1.55μm左右,证明了微腔的选频作用。通过进一步分析谱线计算出微球的Q值在108量级,实验测得自由频谱宽度与理论计算的结果基本一致。     

Analysis of factors of top coal caving in fully mechanized sublevel caving face in soft coal and control

According to the analysis of the mechanism of top coal caving, the caving condition was pointed out, and many factors of caving were also determined. Then the relationship between factors and caving was studied. Based on the above research, one effective method by using field monitoring was brought forward to determine the controlling factor. Then some related key technologies were provided, such as keeping the integrality of the top-coal, raising the horizontal resistance of supports and decreasing the real end-face distance etc.. At last one application of this method was presented, and it was proved to be an effective method.     

Study on destructions and reinforcement measures of mined constructions

Ground movement and deformation caused by underground mining would destroy the constructions located within subsidence area. Constructions would suffer different destructions with different location. The effect of ground deformation caused by underground mining to constructions was analyzed. Analyzed the destructive types of constructions in different ground movement and deformation. Taking a two-storey building for example, the walls were reinforced by computation before mining. To protect the construction the reinforcement measures to the construction before mining were studied.     

Analysis on relation between safety input and accidents

The number of safety input directly determines the level of safety, and there exists dialectical and unified relations between safety input and accidents. Based on the field investigation and reliable data, this paper deeply studied the dialectical relationship between safety input and accidents, and acquired the conclusions. The security situation of the coal enterprises was related to the security input rate, being effected little by the security input scale, and build the relationship model between safety input and accidents on this basis, that is the accident model.     

Study on rock burst of fully mechanized sublevel caving mining in deep mine

The theoretical analysis, numerical simulation and field observation were used to study distribution characters of abutment pressure of fully mechanized sublevel caving face in deep mine, fully mechanized sublevel caving and pressure relief in entries along goaf to the influence of rock burst. The results show that： （1） With the increasing of mining depth, the abutment pressure zone is larger, its peak point is transferred to the front of face, the danger area occurring rock burst in the two fully mechanized sublevel caving entries is larger, and its position is far from the face; （2） There is larger failure area in the upper coal in front of the fully mechanized caving face, and strata possibly occurring rock burst transferred to the upwards or far from faces because of the main roof＇s buffer effect to the dynamic pressure burst, then possibility and strength reduced; （3） The position occurring rock burst is stress concentration zones （abutment pressure along the goaf and residual tectonic stress） and zones with geological structure; （4） Strenuous activities of roof is the inducing factor occurring rock burst.     

漆酶对微生物溶煤作用的研究

为进一步探讨漆酶在煤炭微生物溶解过程中的作用,考察了溶煤菌种在溶解褐煤过程中漆酶的表达量,以及另外两株产漆酶菌的漆酶表达量与溶煤效果的关系.结果表明:溶煤过程中三株溶煤菌种均未检测到明显的漆酶表达,而两株产漆酶菌尽管具有较高的漆酶表达量,却未表现出明显的溶煤活性,即漆酶在微生物溶煤过程中不起关键作用.     

松辽盆地三肇凹陷姚家组震积岩岩心识别

通过岩心观察和描述,结合地质背景研究,在松辽盆地三肇凹陷白垩系姚家组一段识别出震积岩。震积岩主要识别标志有液化砂岩脉、地层破裂构造、震裂缝和微断层、层内褶皱、泄水脉和层理变形、自碎角砾构造及不协调岩块等,并通过对震积标志特征和成因机制的研究,建立了震积岩垂向序列。震积岩的发现对三肇凹陷姚家组油气勘探的意义在于:地震活动可以降低储层孔渗参数、增加油气运移通道;地震引起的断裂可以使三角洲前缘水下分流河道和河口坝砂岩体形成良好的岩性圈闭;地震引起的三角洲前缘滑塌可以使浊积岩发育,为形成岩性油藏创造条件。     

一种基于Web Service的虚拟化目录服务

给出了一种虚拟化目录服务结构,利用轻量级目录访问协议构建分布式目录服务,形成一体化的逻辑视图,通过访问控制策略在保持信息节点自治性的同时提供安全保障。文中基于Web Service封装目录服务,提供目录查询和管理的API,实现了跨平台和松耦合的资源访问方式。     

基于AT89S52单片机的电机控制系统设计

介绍一种以AT89S52单片机为控制核心的电机控制系统。用AT89S52单片机、液晶显示器、可逆永磁电机、继电器、LED、按键等完成系统的硬件设计;以Keil μ Vision 3为软件开发环境完成系统的程序设计。经实际运行,该系统实现了在按键的操作下对时间进行设定,控制电机的启动、正反向转动、停止,状态指示灯正确显示工作状态,LCD显示时间。     

基于Pro/E的仿真技术研究与应用

研究了仿真技术,介绍了Pro/E软件,利用Pro/E对挖掘机执行机构进行了结构设计和三维建模,并利用Pro/E的Pro/Mechanism和Pro/Mechanic模块对所建模型进行了仿真;结果表明,仿真效果良好,并认为利用Pro/E完全能够对不很复杂的机构,进行有效的仿真和设计.