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利用WebSocket技术实现B/S端与CAD的即时通信

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信息与电脑 2024年第3期36卷 30-33页

作者：唐群张星刚桂林理工大学南宁分校广西崇左532100 广东南方测绘科技股份有限公司南宁分公司广西南宁530000

为了解决工作人员在网络地理信息系统(WebGIS)上无法直接使用计算机辅助设计(ComputerAided Design,CAD)读取和编辑矢量数据的问题,文章提出利用WebSocket技术实现浏览器/服务器(Browser/Server,B/S)端与CAD的即时通信,并通过开源的NTS... 详细信息

为了解决工作人员在网络地理信息系统(WebGIS)上无法直接使用计算机辅助设计(ComputerAided Design,CAD)读取和编辑矢量数据的问题,文章提出利用WebSocket技术实现浏览器/服务器(Browser/Server,B/S)端与CAD的即时通信,并通过开源的NTS库和熟知文本(Well-Known Text,WKT)语言,快速、直观地实现图形数据与CAD的在线编辑。应用实践表明,文章提出的方法可以高效解决WebGIS平台与CAD的连接,从而提高了工作效率。

关键词： WebGIS CAD WebSocket 即时通信

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圆电流在非均匀磁场中所受的安培力

物理通报 2024年第3期 18-20页

作者：詹琼张兴刚贵州大学物理学院贵州贵阳550025

给出了计算圆电流在非均匀磁场中所受的安培力的两种方法:换元积分法和复变函数法,对教师在教学中处理有关的积分问题以及培养学生的计算能力有一定指导意义.

关键词：圆电流磁场安培力

淬火工艺对28MnCrMoRE油井管钢显微组织及硬度的影响

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金属热处理 2024年第8期49卷 160-165页

作者：孙昭琦李涛韩强张行刚白岩松高志敏内蒙古科技大学材料与冶金学院内蒙古包头014010 内蒙古包钢钢联股份有限公司内蒙古包头014010

以28MnCrMoRE钢油井管钢为研究对象,探究淬火工艺对深井油井管显微组织及硬度的影响。采用金相显微镜对淬火后原奥氏体晶粒进行观察,通过Image-ProPlus软件对原始奥氏体晶粒度进行统计;利用扫描电镜对淬火后的微观组织进行了观察及分析... 详细信息

以28MnCrMoRE钢油井管钢为研究对象,探究淬火工艺对深井油井管显微组织及硬度的影响。采用金相显微镜对淬火后原奥氏体晶粒进行观察,通过Image-ProPlus软件对原始奥氏体晶粒度进行统计;利用扫描电镜对淬火后的微观组织进行了观察及分析;利用洛氏硬度计进行硬度测试。结果表明,28MnCrMoRE钢分别经870、900、930℃保温30 min水淬后,原始奥氏体晶粒平均尺寸随淬火温度上升由8.21μm增大到12.67μm。当淬火温度为900℃,试验钢在保温90 min时原始奥氏体晶粒发生明显的异常长大;保温30 min时,原始奥氏体晶粒相对细小均匀且尺寸符合正态分布。28MnCrMoRE钢淬火组织为马氏体+贝氏体+残留奥氏体。随着淬火温度的升高或保温时间的延长,马氏体含量逐渐减少,组织有一定的粗化,试验钢的硬度先上升后下降,最大值为53.02 HRC。

关键词： 28MnCrMoRE钢油井管淬火工艺显微组织硬度

Bioinspired Scraper-File Type Frequency-Doubling Ultrasonic Exciter

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Journal of Bionic Engineering 2024年第4期21卷 1801-1816页

作者： Wenshuai Wu Mingshuo zhang Zeming Li Guang Yao xinggang Jiang Deyuan zhang School of Mechanical Engineering and Automation Beihang UniversityBeijing100191China Institute of Bionic and Micro-Nano Systems Beihang UniversityBeijing100191China Guangdong Provincial Key Laboratory of Minimally Invasive Surgical Instruments and Manufacturing Technology Guangdong University of TechnologyGuangzhou510006China

In the natural world,leaf-cutting ants cause vibrations through their mutual scraping of file-scraper *** this study,we designed a Biomimetic Ultrasonic Exciter(BUE)that imitates leaf-cutting *** operating characteristics of the BUE were studied through experimental testing and finite element *** results showed that the BUE could generate stable ultrasonic vibrations,and that the excitation frequency only needed to be half the Output Frequency(OF).This frequency-doubling phenomenon was conducive to achieving BUE *** further explore the phenomenon of frequency-doubling vibration output,this study designed scrapers of five different sizes,conducted excitation and first-order natural frequency measurement tests,and the corresponding finite element *** was found that each scraper could operate in frequency-doubling mode,but the operating frequency and natural mode frequencies did not correspond with one *** further explicate experimental and simulation results,a two-degrees-of-freedom vibration model was *** was evident that the contact relationship between the dentate disc and scraper introduced strong nonlinear factors into the system,accounting for the frequency-doubling phenomenon and the difference between the BUE’s operating and mode *** BUE could be expected to facilitate the production of high-power micro-ultrasonic generators and has potential application value in the fields of mechanical processing,industrial production,and medical health.

关键词： Leaf-cutting ants Power ultrasound Nonlinear vibration Ultrasonic scalpel Micro vibrator

Ti_(3)C_(2)T_(x) MXene/carbon composites for advanced supercapacitors:Synthesis,progress,and perspectives

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Carbon Energy 2024年第2期6卷 113-142页

作者： Yanqing Cai xinggang Chen Ying Xu Yalin zhang Huijun Liu Hongjuan zhang Jing Tang College of Materials Science and Engineering North China University of Science and TechnologyTangshanChina Hebei Iron and Steel Laboratory North China University of Science and TechnologyTangshanChina Songshan Lake Materials Laboratory DongguanChina Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghaiChina State Key Laboratory of Petroleum Molecular and Process Engineering(SKLPMPE) Sinopec Research Institute of Petroleum Processing Co.Ltd.BeijingChina Institute of Eco-Chongming ShanghaiChina

MXenes are a family of two-dimensional(2D)layered transition metal carbides/nitrides that show promising potential for energy storage applications due to their high-specific surface areas,excellent electron conductivity,good hydrophilicity,and tunable *** various types of MXenes,Ti_(3)C_(2)T_(x) is the most widely studied for use in capacitive energy storage applications,especially in supercapacitors(SCs).However,the stacking and oxidation of MXene sheets inevitably lead to a significant loss of electrochemically active *** overcome such challenges,carbon materials are frequently incorporated into MXenes to enhance their electrochemical *** review introduces the common strategies used for synthesizing Ti_(3)C_(2)T_(x),followed by a comprehensive overview of recent developments in Ti_(3)C_(2)T_(x)/carbon composites as electrode materials for ***_(3)C_(2)T_(x)/carbon composites are categorized based on the dimensions of carbons,including 0D carbon dots,1D carbon nanotubes and fibers,2D graphene,and 3D carbon materials(activated carbon,polymer-derived carbon,etc.).Finally,this review also provides a perspective on developing novel MXenes/carbon composites as electrodes for application in SCs.

关键词： electrochemical performance MXene/carbon composites supercapacitors

Predicted Climate Change will Increase Landslide Risk in Hanjiang River Basin,China

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Journal of Earth Science 2024年第4期35卷 1334-1354页

作者： xinggang Tang Lingjian Wang Huiyong Wang Yingdan Yuan Dou Huang Jinchi zhang Co-Innovation Center for Sustainable Forestry in Southern China Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological RestorationNanjing Forestry UniversityNanjing210037China Jiangsu Key Laboratory of Crop Genetics and Physiology College of Horticulture and Plant ProtectionYangzhou UniversityYangzhou225009China College of Forestry Nanjing Forestry UniversityNanjing210037China

Landslides are widespread geomorphological phenomena with complex mechanisms that have caused extensive causalities and property damage *** scale and frequency of landslides are presently increasing owing to the warming effects of climate change,which further increases the associated safety *** this study,the relationship between historical landslides and environmental variables in the Hanjiang River Basin was determined and an optimized model was used to constrain the relative contribution of variables and best spatial response *** optimal MaxEnt model was used to predict the current distribution of landslides and influence of future rainfall changes on the landslide *** results indicate that environmental variables in the study area statistically correlate with landslide events over the past 20 *** MaxEnt model evaluation was applied to landslide hazards in the Hanjiang River Basin based on current climate change *** results indicate that 25.9%of the study area is classified as a high-risk *** main environmental variables that affect the distribution of landslides include altitude,slope,normalized difference vegetation index,annual precipitation,distance from rivers,and distance from roads,with a cumulative contribution rate of approximately 90%.The annual rainfall in the Hanjiang River Basin will continue to increase under future climate warming *** rainfall will further increase the extent of high-and medium-risk areas in the basin,especially when following the RCP8.5 climate prediction,which is expected to increase the high-risk area by 10.7%by ***,high landslide risk areas in the basin will migrate to high-altitude areas in the future,which poses new challenges for the prevention and control of landslide *** study demonstrates the usefulness of the MaxEnt model as a tool for landslide susceptibility prediction in the Hanjiang River Basin caused by global warming and yi

关键词： Hanjiang River Basin climate change environmental factor landslide susceptibility assessment MaxEnt model

BT135VRE页岩气开发专用套管性能研究

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石油管材与仪器 2024年第4期10卷 13-17,I0002页

作者：倪鑫张行刚石晓霞米永峰余泽金詹飞周继峰内蒙古包钢钢联股份有限公司内蒙古包头014010 内蒙古包钢钢管有限公司内蒙古包头014010

与常规油气开采相比,页岩气开采多为大斜度和水平井,完井射孔多达20段以上,同时套管在井下还要受到反复的拉、压、挤等交变载荷,下井深、井下温度高,工况条件苛刻。针对以上问题,设计并开发了BT135VRE高钢级页岩气开采专用套管,同时对... 详细信息

与常规油气开采相比,页岩气开采多为大斜度和水平井,完井射孔多达20段以上,同时套管在井下还要受到反复的拉、压、挤等交变载荷,下井深、井下温度高,工况条件苛刻。针对以上问题,设计并开发了BT135VRE高钢级页岩气开采专用套管,同时对其理化性能、组织、热稳定性、常温抗挤毁性能、高温抗挤毁性能进行了研究。结果表明,在900℃淬火+670℃回火的热处理工艺下,BT135VRE屈服强度≥965 MPa,0℃横向冲击吸收功≥100 J,高强度下匹配高的韧性,同时材料在高温下还具有良好的热稳定性和高温抗挤毁性能,满足复杂工况条件下页岩气开采需求。

关键词： BT135VRE 高温抗挤毁高强高韧页岩气套管

Weakly supervised point cloud segmentation via deep morphological semantic information embedding

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CAAI Transactions on Intelligence Technology 2024年第3期9卷 695-708页

作者： Wenhao Xue Yang Yang Lei Li Zhongling Huang xinggang Wang Junwei Han Dingwen zhang School of Automation Northwestern Polytechnical UniversityXi'anChina Institute of Mechanical and Electrical Engineering BeijingChina School of Electronic Information and Communications Huazhong University of Science and TechnologyWuhanChina

Segmenting the semantic regions of point clouds is a crucial step for intelligent agents to understand 3D *** supervised point cloud segmentation is highly desirable because entirely labelling point clouds is highly time-consuming and *** the low-costing labelling of 3D point clouds,the scene-level label is one of the most effortless label ***,due to the limitation of classifier discriminative capability and the orderless and structurless nature of the point cloud data,existing scene-level method is hard to transfer the semantic information,which usually leads to the under-activated or over-activated *** this end,a local semantic embedding network is introduced to learn local structural patterns and semantic ***,the proposed network contains graph convolution-based dilation and erosion embedding modules to implement‘inside-out’and‘outside-in’semantic information dissemination ***,the proposed weakly supervised learning framework could achieve the mutual propagation of semantic information in the foreground and *** experiments on the widely used ScanNet benchmark demonstrate the superior capacity of the proposed approach when compared to the current alternatives and baseline models.

关键词： artificial intelligence computer vision deep learning

High-efficiency ultrasonic assisted drilling of CFRP/Ti stacks under non-separation type and dry conditions

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第4期25卷 275-291页

作者： Enze YING Zehua ZHOU Daxi GENG Zhenyu SHAO Zhefei SUN Yihang LIU Lianxing LIU xinggang JIANG Deyuan zhang School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Beijing Chenjing Electronics Company Limited Beijing 100015China Aerospace Times Feihong Technology Company Limited Beijing 100094China

In this study,to address the low efficiency for conventional ultrasonic-assisted drlling(UAD)of carbon fiber-reinforced plastic and titanium alloy(CFRP/Ti)stacks,feasibility experiments of non-separation UAD,in which continuous cutting between the tool and the workpiece occurs at a high feed rate,are carried *** experimental results indicate that,compared to conventional separation UAD,the non-separation UAD effectively reduces the cutting forces by 24.2%and 1.9%for CFRP stage and 22.1%and 2.6%for the Ti stage at the feed rates of 50 and 70μm/r,***,the non-separation UAD significantly improves hole quality,including higher hole diameter accuracy,lower hole surface roughness,and less hole *** addition,the non-separation UAD can decrease adhesive tool *** study demonstrates that,compared to conventional drilling(CD),the non-separation UAD can effectively improve drilling quality and tool life while maintaining high efficiency.

关键词： Carbon fiber-reinforced plastic and titanium alloy(CFRP/Ti)stacks Ultrasonic-assisted drlling(UAD) Cutting force Surface integrity Tool wear