A Statistical Analysis on Tidal Triggering of Earthquakes in the Kashi-Wuqia Intersection Area in Xinjiang

A statistical analysis on earthquake activity in the Kashi-Wuqia intersection area triggered by earth tide is done by Schusters test and the Permutation test on daily and monthly scales. The north-south,east-west component of the tidal force and tidal body stress are chosen as the tidal curve in the daily scale. The results show that most of the earthquakes occurred near the maximum 0° of the three kinds of tidal curves,the predominant tidal phases of the earthquake are- 5. 86°,6. 60° and- 15. 52°,and the frequency of the earthquakes increases with the increase of the tide; with three kinds of tidal curves( the north-south,east-west component of the tidal force and tidal body stress),the p S of Schusters test for all the earthquakes is 10. 52%,2. 40% and 2. 06%,and the p P of the Permutation test is 10. 90%,2. 40% and 2. 06%,and the results of p S and p P based on the east-west component of the tidal force and tidal body stress are below the threshold of 0. 05 that tidal triggering of earthquakes. In the monthly scale,both the p S and p P are very low( close to 0),far below the threshold of 0. 05 of tidal triggering of earthquakes,and the predominant tidal phase for earthquake triggering is- 18. 95°,close to the maximum 0°( new moon and full moon) of the earth tide in monthly scale. Regarding the statistical test result of tidal triggering of earthquakes,a preliminary explanation is given as to why the trigger effect in the east-west direction is greater than that in north-south direction.

Hydrocarbon migration and accumulation along the fault intersection zone-a case study on the reef-flat systems of the No.1 slope break zone in the Tazhong area, Tarim Basin

Understanding hydrocarbon migration and accumulation mechanisms is one of the key scientif ic problems that should be solved for effective hydrocarbon exploration in the superimposed basins developed in northwest China. The northwest striking No.1 slope break zone, which is a representative of superimposed basins in the Tarim Basin, can be divided into five parts due to the intersection of the northeast strike-slip faults. Controlled by the tectonic framework, the types and properties of reservoirs and the hydrocarbon compositions can also be divided into five parts from east to west. Anomalies of all the parameters were found on the fault intersection zone and weakened up-dip along the structural ridge away from it. Thus, it can be inferred that the intersection zone is the hydrocarbon charging position. This new conclusion differs greatly from the traditional viewpoint, which believes that the hydrocarbon migrates and accumulates along the whole plane of the No.1 slope break zone. The viewpoint is further supported by the evidence from the theory of main pathway systems, obvious improvement of the reservoir quality （2-3 orders of magnitude at the intersection zone） and the formation mechanisms of the fault intersection zone. Differential hydrocarbon migration and entrapment exists in and around the strike- slip faults. This is controlled by the internal structure of faults. It is concluded that the more complicated the fault structure is, the more significant the effects will be. If there is a deformation band, it will hinder the cross fault migration due to the common feature of two to four orders of magnitude reduction in permeability. Otherwise, hydrocarbons tend to accumulate in the up-dip structure under the control of buoyancy. Further research on the internal fault structure should be emphasized.

Analysis of occupation time of vehicles at urban unsignalized intersections in non-lane-based mixed traffic conditions

In India, traffic flow on roads is highly mixed in nature with wide variations in the static and dynamic characteristics of vehicles. At unsignalized intersections, vehicles generally do not follow lane discipline and ignore the rules of priority. Drivers generally become more aggressive and tend to cross the uncontrolled intersections without considering the conflicting traffic. All these conditions cause a very complex traffic situation at unsignal- ized intersections which have a great impact on the capacity and performance of traffic intersections. A new method called additive conflict flow （ACF） method is suitable to determine the capacity of unsignalized inter- sections in non-lane-based mixed traffic conditions as prevailing in India. Occupation time is the key parameter for ACF method, which is defined as the time spent by a vehicle in the conflict area at the intersection. Data for this study were collected at two three-legged unsignalized intersections （one is uncontrolled and other one is semi- controlled） in Mangalore city, India using video-graphic technique during peak periods on three consecutive week days. The occupation time of vehicles at these intersections were studied and compared. The data on conflicting traffic volume and occupation time by each subject vehicle at the conflict area were extracted from the videos using image processing software. The subject vehicles were divided into three categories： two wheelers,cars, and auto-rickshaws. Mathematical relationships were developed to relate the occupation time of different cate- gories of vehicles with the conflicting flow of vehicles for various movements at both the intersections. It was found that occupation time increases with the increasing con- flicting traffic and observed to be higher at the uncontrolled intersection compared to the semicontrolled intersec- tion. The segregated turning movements and the presence of mini roundabout at the semicontrolled intersection reduces the conflicts of vehicular movements, which ulti- mately reduces the occupation time. The proposed methodology will be useful to determine the occupation time for various movements at unsignalized intersections. The models developed in the study can be used by practitioners and traffic engineers to estimate the capacity of unsignalized intersections in non-lane-based discipline and mixed traffic conditions.

Research on the Optimization Design of Intersections for Safe Operation of Large Trucks

When big trucks are running at urban road intersections,they are easy to interfere with other motor vehicles,and the turning big trucks are easy to have conflicts with non-motor vehicles and pedestrians,which will affect the safety of intersections.This paper first studied the intersection of trucks to the running trajectory,on this basis,through the establishment of mathematical model analysis of large truck steering conditions inside the wheel,and the influence of blind area to the driver.In the research of intersection safety design,the safety design is divided into three parts:Entrance road,internal operation and signal control.At the same time,the design method of the entrance road,the interior of the intersection and the signal control is given,which improves the safety of the truck driving at the intersection.Finally,the intersection of Jungong road and Zhoujiazui road in Yangpu district of Shanghai was selected as a case,and the optimal design of the intersection for large trucks was carried out through the investigation and analysis of actual data.The evaluation and analysis were carried out by using the multi-index matter-element model.The results show that the comprehensive safety correlation degree of the intersection is reduced to 0.42,and the safety level of is improved by one level.

幼童脑干形态学与增龄发育的数字化特征

背景:既往对脑干研究多集中于成人和胎儿,而对国人幼童脑干的增龄发育特征研究甚少。目的:观测健康幼童脑干发育特征,探究其增龄差异及其与性别间的相关性。方法:2019年1月至2022年4月对内蒙古医科大学附属医院174例2-6岁幼童颅颈部3.0T MRI图像行回顾性研究,测量脑干(含中脑、脑桥、延髓)正中矢状面径线、面积和角度。结果与结论:中脑、脑桥、延髓前后径在2-5岁组,中脑、脑桥、延髓纵径和面积在2-6岁组总体随增龄呈递增趋势,除延髓纵径外均呈正相关(r>0,P<0.05),在2-3岁组、4-5岁组期间处于快速生长发育阶段,这2个年龄组可作为幼童发育重点观测指标;脑桥前后径、纵径、面积和脑干总面积与年龄相关性较强,可作为其脑干发育重点观测指标。

机场终端区晴好天气容量评估方法的初步研究

在我国航空运输需求迅速增长,运营压力激增的背景下,采用适当的容量评估模型对于繁忙机场的理论容量研究和机场运行规划具有重要意义。以最大流最小割定理为基础,建立了进离场航段容量模型和交叉点容量模型,并选择西安咸阳机场进行仿真验证。研究结果表明,该模型能够高度准确地预测机场容量,其预测结果接近实际运行最大小时流量的105%~110%。表明该模型在终端区容量评估方面具有出色的精确性,特别适用于晴朗天气条件下的情况。这一研究为机场管理者提供了强大的决策工具,有助于更有效地满足不断增长的航空交通需求,确保机场运行的高效性和安全性。

深孔钻导向条与孔壁挤压作用对钻孔偏斜的影响分析

深孔加工应用领域广泛,作为评定深孔加工的重要指标,钻孔偏斜量的优劣直接决定深孔件加工质量。为了研究深孔加工过程中深孔刀具系统对孔轴线偏斜量的影响,综合考虑中弱刚度钻杆弯曲效应和导向条对孔壁接触挤压作用,基于直梁弯曲位移理论和弹塑性力学的曲面赫兹接触理论,建立导向副接触模型。通过导向副接触模型分析钻削深度对导向副接触区域的影响,试验证明,建立的理论模型所得结果与钻削试验结果基本一致。

城市核心区道路交叉口交通组织优化与评估

城市核心区道路交叉口畅通是城市路网系统高效运营的关键。本文选取新一线城市佛山顺德区核心区域的兴顺路与京珠线交叉口为研究对象。在对区域交通现状实地调查调查的基础上,采用饱和度评价、平均延误评价、最佳信号周期评价等研究方法,对兴顺路与京珠线交叉口的交通组织进行优化设计,从交叉口的渠化、信号配时等方面,提出了交叉口北进口处设置待转区和交叉口北进口处设置借道左转的2种方案,通过对方案进行评估和比较,最终确定交叉口北进口处设置借道左转的方案更优,以此为佛山市核心道路交叉口的交通优化提供参考和借鉴。

基于车辆行驶特征的左弯待转区精细化研究

针对左弯待转区存在许多施划不合理的情况,为研究合理的施划方法,首先借助Tracker运动软件提取车辆轨迹坐标和车速,然后分析左转车辆的行驶特征,拟合出典型转弯半径和典型车速,经验证拟合结果处在规范合理区间。根据拟合结果对交叉口左弯待转区进行优化,根据优化前后对比证明优化后的轨迹更合理。

信号控制交叉口直行待行区对通行能力的影响研究

有关道路交叉口直行待行区对通行能力影响的研究不够完善和全面,在实际应用中存在诸多问题。分析直行待行区设置的目的和条件,基于直行待行区停止线前移的特性,考虑启动波对启动损失时间的影响,完善了损失时间和清空时间的计算方式。在停车线法计算通行能力的基础上进行修正,构建了直行待行区交叉口进口道的通行能力模型,量化直行待行区对通行效率的影响。基于实例交叉口视频识别数据,通过轨迹平滑化和缺失轨迹补齐方法获得完整车辆轨迹,并获取交通参数的实际数值,保证了模型结果的实际意义。最后运用仿真软件对通行能力模型结果进行验证,与类似模型进行对比。结果表明:构建的通行能力模型模拟真实情况的准确性较高;由于直行待行区对通行过短对通行能力的优化效果较弱,建议在条件允许的情况下尽量将直行待行区设置到最大长度。

基于交比图像量测技术检测建筑物表面损伤面积的方法

文章提出了基于交比图像量测技术检测建筑物表面损伤面积的方法,针对建筑物外表面损伤部分检测困难,几何信息难以提取的问题,文章将基于交比的单幅图像量测技术应用至含有丰富三维空间平行线的建筑物图像量测中。首先,对图像进行畸变的矫正;再利用建筑物结构中的垂直水平等几何关系,找到消失点,结合已知长度的参考线段以及消失点、消失线构建交比,框选出待测区域,多次嵌套后实现对框选区域边长的量测;再通过数字图像处理技术,对目标区域进行透视变换还原成矩形,并实现二值化、形态学滤波等处理;最后在计算出框选区域实际面积后,统计出框选区域总像素点个数以及损伤区域像素点个数,找到比例关系,计算得到损伤区域面积。

视觉联合交集下施工危险区域侵入行为动态感知方法

为解决行为险态识别脱离场景信息的问题,基于视觉联合交集,提出一种施工危险区域侵入行为动态感知方法。该方法以YOLOX模型为基础算法,引入轻量级Transformer,采用Mosaic数据增强方式,通过设计候选框联合交集(iou)将危险区域与工人行为状态关联,结合场景信息对工人行为险态进行理解。以临边作业为实验场景,在工人行为状态与危险区域位置关系精准识别的基础上,实现施工危险区域侵入行为的动态监控,改进后的YOLOX模型在每秒处理图像帧数降低1.33的情况下平均精度提高3.01%。实地测试结果表明:检测类别识别的平均精度均高于91.5%,iou准确率均为100%,可为施工场景内工人行为险态的实时感知提供参考,具有实效性与可推广性。

基于三角形面积的海空重力交叉点搜索法

目前海空重力测量中测线网交叉点搜索的计算方法存在精度不高和操作复杂等缺点,可以通过改善交叉点搜索方法使得海空重力测量数据处理过程进一步优化。新提出一种基于三角形面积原理实现交叉点搜索的方法,并通过仿真数据和实测数据验证此方法的简洁性和有效性。计算结果表明,利用新提出的交叉点搜索法求解的测线网内符合精度要比主副测线斜率法提升0.02 mGal左右,计算速度要比行列式法快。本文的研究对于进一步优化海空重力测量中交叉点搜索方法具有一定的借鉴意义。

正反向结合灰自助滤波法在滚动轴承性能可靠性评估中的应用

基于正反向结合灰自助滤波法提取出有效的轴承性能退化信息,从而精准地计算轴承运行过程中的性能可靠度。分别运用正向灰自助滤波法和反向灰自助滤波法对采集到的滚动轴承振动加速度数据进行降噪,并将其进行融合得到新的数据序列;基于概率密度函数交集法,将滤波前后数据序列的概率密度函数交集面积作为定量评定滤波效果的新指标;选定性能阈值,计算各个数据序列的变异个数、变异概率和性能可靠度,定量分析轴承运行过程中的性能变异程度。两个案例均表明正反向结合灰自助滤波法的效果最好,将其用于评估滚动轴承的性能退化过程是可行的。

基于局部信息的手写汉字笔画提取

现有计算机在指导手写汉字练习与测试中,指导依据大都基于全局特征,缺少基于更细粒度特征。提出一种基于局部信息的手写汉字笔画提取方法,为手写汉字评价与指导等任务提供数据支持。首先提取出汉字骨架并对骨架中的毛刺与断裂等问题进行优化;然后使用PBOD算法提取汉字交叉区域后,对交叉区域进行合并删除,消除笔画形变,通过局部信息计算笔画段的组合系数,根据组合系数提取笔画;最后根据获取到的笔画数与算法迭代次数,动态调整组合系数阈值,保证在正确连接笔画段的前提下提取到更可能多的笔画。将该方法在手写汉字数据集上进行实验,其准确率、召回率与F1值分别达到了95.91%、95.71%与95.81%,可用于后续的手写汉字评判与指导等任务。

车路协同环境下交叉口区域生态驾驶策略研究

为改善车辆通行交叉口区域的燃油消耗和污染物排放,在车路协同环境下研究车辆通行交叉口区域的生态驾驶策略。利用VT-Micro模型构建车辆百公里燃油消耗量和CO_(2)排放量计算模型,提出车辆匀速策略以及通行交叉口区域的加、减速策略。根据不同的信号灯相位及剩余时长分别建立生态驾驶策略,并在Matlab中进行仿真验证。仿真结果表明,所建立的生态驾驶策略节能减排效果显著,其中针对信号灯相位为绿灯的生态驾驶策略可降低16.82%~38.26%的油耗,减少5.57%~43.18%的CO_(2)排放量;信号灯相位为红灯的生态驾驶策略可以降低31.46%~43.29%的油耗,减少15.19%~54.64%的CO_(2)排放量。

基于灰度图的空基双站交会定位区模型

确定和分析交会定位区是电子对抗侦察行动的一项重要工作。构建起双站交会定位区模型;设计一种确定区域轮廓的算法,实现定位区域的灰度图表示;仿真分析最佳站距的影响因素,提出确定最大内接矩形的方法,以及分析偏航角对侦察效率的影响。通过仿真证明建模方法的合理性,为电子对抗直升机侦察部署提供参考。

基于ArcGIS模型构建器的国土调查数据质量检查

为了快速找出问题数据,提升国土调查数据精度,保证国土调查成果具有现实意义,提出基于ArcGIS模型构建器的国土调查数据质量检查方法。依据国土调查数据质检要求,在ArcGIS平台框架下,利用ArcGIS模型构建器建立国土调查数据质量检查模型,将本次国土调查地类图斑数据及历年耕地图层数据作为模型的输入变量,将国土调查的问题图斑作为模型的输出变量,整个模型的运行过程包括本次国土调查地类图斑数据的筛选、不同地类的提取以及净面积运算、历年耕地图层的融合以及数据相交等环节,ArcGIS模型构建器将这些环节组建成一个工作流,使多步骤的国土调查数据质检操作,可以在ArcGIS平台下达的同一指令下完成。实验证明:利用该方法能够准确检查出国土调查数据中出现的问题,所提数据相交方法,可以使整个国土图斑得到较好的整合,方便后续工作的开展。

城市新区市政道路交叉口设计要点分析

在社会经济高速发展的新时代背景下,城市新区面临着繁重的交通压力,而市政道路的交叉口是造成城市交通拥堵的主要通道.在工程设计环节,如若没有充分掌握市政道路的整体布局,则会导致交通组织混乱,增加城市交通拥堵率,给城市新区的交通发展带来严重的负面影响.对此,本文针对城市新区市政道路交叉口的设计原则进行了分析,并对交叉口设计要点展开探讨,以供参考.

提前右转组织方式及其影响分析

以可插车间隙理论和概率论为基础,建立了固定与可变交织区长度的提前右转组织方式下右转机动车通行能力计算模型与延长交织区所能够增加的通行能力的计算模型,提出了提前右转组织方式的适用条件。以平均延误为指标,对比分析了两种组织方式下右转机动车的运行效果,基于Webster信号配时方法,对实行提前右转方式的交叉口内直行和左转车流的通行能力进行了分析。分析结果表明:采用提前右转组织方式后交叉口直行和左转通行能力增加;在右转机动车提前右转能够满足通行能力时,提前右转可减小冲突区的面积,否则,可以通过延长交织区长度来增加通行能力,以减少右转车的平均延误。