地震频谱衰减属性在松辽盆地南部深层火山岩气藏预测中的应用

松辽盆地南部深层火山岩气藏具有岩性复杂、非均质性强的特点。受地震资料分辨率和信噪比的限制,采用地震振幅属性和地震相分析等技术手段预测含气性的效果较差。地震频谱衰减属性可以反映地层的吸收性质、岩相和含气性,利用含气层段对地震波高频能量吸收强的特点,可以较好地预测含气层段。采用最大熵谱算法计算储层的谱率,预测低谱率部分可能含气;同时,采用该算法计算储层上、下一定时窗内地层频谱的比值,获得频谱衰减剖面,预测高频衰减强烈层段为含气层。这2种预测方法相互结合可以有效降低含气预测的多解性。实际应用也证明用地震频谱衰减属性预测含气性是行之有效的。     

The development of FtsZ inhibitors as potential antibacterial agents

The emergence and prevalence of bacterial resistance has resulted in a clear demand for novel antibacterial drugs. As a tubulin homologue, FtsZ is an essential cell-division protein in prokaryotic organisms and is showing increasing promise as a target for antibacterial drug discovery. This review describes the role of FtsZ in bacterial cytokinesis and various FtsZ inhibitors, with particular focus on their discovery, antibacterial activities, mechanisms of action, synthetic methods, and representative analogues.     

Strongly visible-light responsive plasmonic shaped AgX:Ag (X = Cl, Br) nanoparticles for reduction of CO(2) to methanol

Plasmonic shaped AgX:Ag (X = Cl, Br) nanoparticles have been synthesized by a facile and versatile glycerol-mediated solution route. The as-prepared AgX:Ag nanoparticles exhibit regular shapes, i.e., cube-tetrapod-like AgCl:Ag nanoparticles and AgBr:Ag nanoplates. Compared with the pristine AgX, AgX:Ag nanocomposites display stronger absorption in the visible region due to the surface plasmon resonance of silver nanoparticles. The calculation of bandgaps and band positions indicates the as-achieved AgX:Ag nanoparticles can be used as a class of potential photocatalyst for the reduction of CO(2). For example, reduction of CO(2) under visible light irradiation with the assistance of the anisotropic AgX:Ag nanoparticles yields as much as 100 μmol methanol in the products. Furthermore, the AgX:Ag nanoparticles can maintain its structure and activity after 3 runs of reactions. Therefore, the present route opens an avenue to acquire plasmonic photocatalysts for conversion of CO(2) into useful organic compounds.     

基于数学形态学和模糊聚类的旋转机械故障诊断

提出了一种数学形态学与GG (Gath-Geva)模糊聚类相结合的旋转机械故障诊断方法,通过对滚动轴承信号的多尺度形态运算得到信号的形态谱,定量反映了信号在不同尺度下的形态变化特征.为进一步对滚动轴承信号进行故障识别,提取出基于形态学操作的分形维数和描述不同信号形态特征的指标即形态谱墒,并把这2个参数作为GG聚类的故障特征向量,进行聚类分析,同时对GG聚类与FCM(fuzzy center means)聚类和GK (Gustafaon-Kessel)聚类进行了比较.实验证明了基于数学形态学与GG聚类相结合的机械故障诊断方法的有效性,且证明了GG聚类更适合对不同形状、大小和密度的空间故障数据模糊聚类,聚类效果更好.     

小型风光互补反渗透海水淡化装置研制

介绍了风光互补供电海水淡化装置原理和研制的离网风光互补反渗透海水淡化装置,运行结果表明,该淡化装置吨水能耗约4.8 kWh/m3,适于偏远海岛、船舶、电力供应缺乏的场所,为3～5人的小集体提供生活淡水,具有较强应用推广前景,经济、环境和社会效益明显。     

基于航拍序列图像的输电线弧垂测量方法

弧垂是输电线路运行的一个重要参数,直接关系到电网运行的安全性和可靠性.提出了一种基于直升机巡检时采集的航拍序列图像进行弧垂测量的新方法.选取输电线路上的隔离棒作为识别目标,采用归一化互相关图像匹配算法,结合基于小波的金字塔分层搜索策略,测量出隔离棒中心在序列图像上的像素坐标;然后基于立体视觉技术对隔离棒中心的三维空间坐标进行测量;最后通过最小二乘非线性回归算法,计算出输电线的实际弧垂.实验结果表明该方法可以提高弧垂测量的效率,并且适合在复杂地理条件下应用.     

继电保护装置与通信设备2 Mbit/s光接口互联技术

目前在电网运行中复用继电保护装置与通信光传输设备间以2 Mbit/s电口互连,存在着连接复杂、光电转换设备缺少统一的接口标准、光电转换设备不能网管监控等问题。因此,提出了适用于保护装置和通信设备的2 Mbit/s光接口方式及其技术标准,并完成了相关测试工作。结果显示,复用继电保护装置与通信光传输设备之间采用统一标准的2 Mbit/s光接口直连通信是可行的,但其可靠性和稳定性尚待进一步验证。     

Drilling characteristics of SiCp/Al composites with electroplated diamond drills

SiCp/Al composites are extensively used in aerospace, automotive, and civil applications, and the machining characteristic of SiCp/Al composites is an issue of great economic impact. This paper presents an experimental investigation of the drilling characteristics during machining of SiCp/Al composites with electroplated diamond drills; the drilling characteristics were evaluated in terms of drilling forces, tool wear, surface roughness, and entrance edge quality. Due to the very different machining properties between the SiC particles and Al alloy matrix, in a broader sense, the edge defect is defined as an undesirable effect generated at the edge of a workpiece after the machining process. The results demonstrate that with the increase of the drilling speed, both the thrust force and torques have no significant increase, while the surface roughness increased quickly. In addition, it is found that the formation of the entrance edge defects was associated with the varying of the drilling force and the electroplated diamond drills were subjected to an extremely rapid flank wear. The primary wear mechanism includes abrasive and adhesive wear of the flank face.     

基于ABAQUS的钛合金铣削力的模拟分析

为了研究钛合金在铣削过程中切削力随着切削参数的变化规律,建立了三维斜角切削有限元模型。通过对材料本构模型,刀—屑接触摩擦模型和切屑分离准则等关键环节建模,采用通用有限元求解器ABAQUS/Ex-plicit对钛合金Ti6Al4V的斜角切削过程进行了模拟,获得了切削速度v、切削深度ap和每齿进给量fz对切削力的变化趋势及影响程度。模拟结果表明:切削力随着切削深度ap和每齿进给量fz的增大而增大,而随着切削速度增大切削力波动很小。切削深度对切削力的影响最大,进给量次之,切削速度对切削力的影响最小。该模型可以为切削参数的合理选择提供参考。