环渤中地区新近系控藏模式与高丰度油藏勘探实践

环渤中地区新构造运动强烈,新近系是主要的含油层系.新近系勘探早期集中于凸起区和陡坡带,而斜坡带和凹陷区由于缺乏油气运移条件的系统性研究导致其勘探成效较差.基于前人研究和钻井资料,从分析环渤中地区新近系油气运移路径出发,通过建立"汇聚脊-断层-圈闭(脊-断-圈)"三元控藏模式,明确了受潜山风化壳汇聚脊控制的深层油气的汇聚...     

0-3/1-3混合连通型铁电陶瓷-铁电聚合物的热释电性

推导出了0-3/1-3混合连通型铁电陶瓷-铁电聚合物的热释电系数表达式, 并详细讨论了陶瓷体积分数 v₂和陶瓷颗粒粒径与膜厚比(G/t)分别对复合材料的热释电系数p_c及p_c/ε_c(ε_c为复合材料的介电常数)的影响。结果表明: 当G/t≥0.5时, 不同陶瓷体积分数复合材料的热释电系数p_c均趋向于某个定值, 说明此时G/t对热释电系数的影响可忽略不计; 另外当陶瓷体积分数为0.1时, 随着G/t的增大, p_c /ε_c出现一个极大值, 且当G/t=0.9时, p_c /ε_c比纯PZT陶瓷的大8倍, 表明此条件为最佳工艺条件。而且, 在低陶瓷体积分数和低G/t比时, 理论曲线与实验数据符合较好。      

基于USB接口和DSP的飞机防滑刹车测试系统设计

提出了以DSP为控制核心,采用USB通信设计的飞机防滑刹车测试系统。分析了飞机防滑刹车测试系统的组成,并介绍了测试系统主要硬件电路设计和系统上下位机软件设计。     

An improved form of smoothed particle hydrodynamics method for crack propagation simulation applied in rock mechanics

The simulation of crack propagation processes in rock engineering has been not only a research hot spot among scholars but also a challenge. Based on this background, a new numerical method named improved kernel of smoothed particle hydrodynamics(IKSPH) has been put forward. By improving the kernel function in the traditional smoothed particle hydrodynamics(SPH) method, the brittle fracture characteristics of the base particles are realized. The particle domain searching method(PDSM) has also been put forward to generate the arbitrary complex fissure networks. Three numerical examples are analyzed to validate the efficiency of IKSPH and PDSM, which can correctly reveal the morphology of wing crack and the laws of crack coalescence compared with previous experimental and numerical studies.Finally, a rock slope model with complex joints is numerically simulated and the progressive failure processes are exhibited, which indicates that the IKSPH method can be well applied to rock mechanics engineering. The research results showed that IKSPH method reduces the programming difficulties and avoids the traditional grid distortion, which can provide some references for the application of IKSPH to rock mechanics engineering and the understanding of rock fracture mechanisms.     

Molecular Cytogenetic Characterization of Novel 1RS.1BL Translocation and Complex Chromosome Translocation Lines with Stripe Rust Resistance

Rye is the most important source for the genetic improvement of wheat. In this study, two stable wheat-rye primary 1RS.1BL translocation lines, RT855-13 and RT855-14, were selected and identified by acid polyacrylamide gel electrophoresis (A-PAGE), co-dominant PCR, and multi-color fluorescence in situ hybridization (MC-FISH) from the progeny of the crossing of the wheat cultivar Mianyang11 and a Chinese rye Weining. When more than two independent, simple reciprocal translocations are involved in a carrier, they are defined as complex chromosome translocations (CCT). The MC-FISH results also indicated that CCT occurred in RT855-13; namely that, besides 1RS.1BL translocation chromosomes, there are other two pairs of balanced reciprocal translocations. It was demonstrated that the interchange between a distal segment of 4B and long arm of 3D occurred in the RT855-13. The novel translocation chromosomes in wheat were recorded as 3DS.4BS^DS and 3DL-4BS^PS.4BL. Reports about CCT as a genetic resource in plant breeding programs are scarce. Both lines expressed high resistance to Puccinia striiformis f. sp. tritici, which are prevalent in China and are virulent on Yr9, and the CCT line RT855-13 retained better resistance as adult plants compared with RT855-14 in the field. Both lines, especially the CCT line RT855-13, exhibited better agronomic traits than their wheat parent, Mianyang11, indicating that both translocation lines could potentially be used for wheat improvement. The results also indicated that the position effects of CCT can lead to beneficial variations in agronomic and resistant traits, making them a valuable genetic resource to wheat breeding programs.     

新型GPS-RTK打桩船定位系统在苏通大桥建设中的应用

苏通大桥南主塔墩第一期基桩钢护筒采用大型打桩船插打施工,利用GPS-RTK卫星定位系统进行打桩船的导航定位。该文说明了GPS-RTK打桩船导航定位系统的原理及构成;简述了打桩船导航定位的作业过程;通过对已插打完成的钢护筒平面位置及垂直度统计,分析了此方法的施工质量。     

基于FIFO的并条机高速数据采集系统设计

如何在很高的出条速度下准确而实时地对棉条厚度信息进行采集,是高速并条机研究中的一大难点.本文提出了一种基于FIFO的并条机高速数据采集系统,描述了系统硬件和软件的设计与实现.对数据采集的特点进行了分析,介绍了FIFO存储器的使用方法,采用定长和定时两种不同的采样触发方式保证了系统的采样精度,并对采集系统的精度进行了检验.目前该系统已应用于某棉纺机械厂新型高速并条机,满足了数据实时采集和高速存储的要求.     

基于线阵CCD的晶圆缺口检测装置

针对采用激光二极管和接收器检测晶圆缺口时存在的一次检测成功率低、检测时间长和机械结构复杂等缺点,为了缩短单片晶圆检测时间,提高晶圆搬运机的效率,本文提出了一种基于线阵CCD的检测方法.通过实验对比证明,该方法与基于激光二极管的检测方法相比,能够缩短一半以上的检测时间,消除了采用激光二极管进行检测时,因晶圆中心和真空吸盘中心存在偏差而引起的检测失败,一次检测成功率达95%以上,同时该方法只需要一个旋转吸盘,简化了机械结构.     

渗流与应力耦合作用对边坡稳定性影响的数值模拟研究

研究渗流与应力耦合作用对裂隙边坡稳定性的影响具有重要的工程指导意义。对呈现裂隙边坡特征的金堆城钼矿北帮边坡分别在不考虑地下水渗流以及考虑渗流与应力共同作用两种情况下进行的有限元数值模拟研究表明:渗流与应力耦合对边坡稳定性具有直接的削弱作用。     

引入注意力机制的JDE多目标跟踪方法

多目标跟踪是计算机视觉领域的一个重要研究内容。JDE(joint detection and embedding)多目标跟踪算法推理速度和精度较高,但是当目标重叠或尺度较小时,该算法的跟踪效果较差。针对以上问题,提出了Attention-JDE,该模型结合了注意力机制、多尺度融合等思想,利用特征金字塔（feature pyramid）和空间金字塔池化（spatial pyramid pooling）提升模型对于小尺度目标的检测和跟踪能力,结合空间域注意力机制和通道域注意力机制改进模型在目标发生重叠时的跟踪效果。此外,还引入了Mish激活函数有效地降低跟踪时的ID切换次数。在MOT16数据集进行验证,结果表明,与原JDE方法以及其他主流方法相比,Attention-JDE具有更高的跟踪精度（MOTA）,同时速度能够达到19.5 FPS,实时性较高。