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General investigation on weldmatching in strength

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China Welding 1995年第2期4卷 98-106页

作者： zhang yufeng Hou Lixing and Wang Lijun(Tianjin University, Tianjin)

Inl this investigation the different tests were carried out on the butt joints of several kinds of steels to study the effects of weldmatching on the fracture initiation under statie and dynamic loading, on the fracture propagating arresting properties, on the fatigue behavior and finally on the residual stress distribution, The testing results show that overmatching of metal increases the possibility of having a general yieleding and may help to enlarge the tolerate of weld defects for crack initiation under dynamic or static loading. In the propagating and arresting cases the beneficial effct of overmatching of weld metal was found .However non significant effect of the weldmatch mg on the propagation thresholds △Kth and da'dN was found.

关键词： Weldmatching. cracking. fatigue behaviour. residual stress

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改进YOLOv5-S的交通标志检测算法

计算机工程与应用 2024年第5期60卷 200-209页

作者：刘海斌张友兵周奎张宇丰吕圣湖北汽车工业学院汽车工程师学院Sharing-X移动服务技术平台联合实验室湖北十堰442000

在自动驾驶领域,现有的交通标志检测方法在检测复杂背景中的标志时存在着漏检或误检的问题,降低了智能汽车的可靠性。对此,提出了一种改进YOLOv5-S的实时交通标志检测算法。在特征提取网络中融合坐标注意力机制,通过构建目标的长范围依... 详细信息

在自动驾驶领域,现有的交通标志检测方法在检测复杂背景中的标志时存在着漏检或误检的问题,降低了智能汽车的可靠性。对此,提出了一种改进YOLOv5-S的实时交通标志检测算法。在特征提取网络中融合坐标注意力机制,通过构建目标的长范围依赖来捕获物体的位置感知,使得算法聚焦于重点的特征区域;引入Focal-EIoU损失函数来取代CIoU,使其更关注高质量的分类样本,提高对难分类样本的学习能力,减少漏检或者误检的问题;在网络中融合轻量级卷积技术GSConv,降低模型的计算量。增加新的小目标检测层,通过更丰富的特征信息提高小尺寸标志的检测效果。实验结果表明,改进方法的mAP@0.5和mAP@0.5:0.95分别为88.1%和68.5%,检测速度达到了83 FPS,能够满足实时可靠的检测需求。

关键词：交通标志检测 YOLOv5 坐标注意机制 Focal-EIoU GSConv

Grid-Based Path Planner Using Multivariant Optimization Algorithm

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Journal of Harbin Institute of Technology(New Series) 2015年第5期22卷 89-96页

作者： Baolei Li Danjv Lv Xinling Shi Zhenzhou An yufeng zhang Jianhua Chen School of Information Science and Engineering Yunnan University Oil Equipment Intelligent Control Engineering Laboratory of Henan Provice Physics & Electronic Engineering CollegeNanyang Normal University School of Information Technology and Engineering Yuxi Normal University

To solve the shortest path planning problems on grid-based map efficiently,a novel heuristic path planning approach based on an intelligent swarm optimization method called Multivariant Optimization Algorithm( MOA) and a modified indirect encoding scheme are proposed. In MOA,the solution space is iteratively searched through global exploration and local exploitation by intelligent searching individuals,who are named as atoms. MOA is employed to locate the shortest path through iterations of global path planning and local path refinements in the proposed path planning approach. In each iteration,a group of global atoms are employed to perform the global path planning aiming at finding some candidate paths rapidly and then a group of local atoms are allotted to each candidate path for refinement. Further,the traditional indirect encoding scheme is modified to reduce the possibility of constructing an infeasible path from an array. Comparative experiments against two other frequently use intelligent optimization approaches: Genetic Algorithm( GA) and Particle Swarm Optimization( PSO) are conducted on benchmark test problems of varying complexity to evaluate the performance of MOA. The results demonstrate that MOA outperforms GA and PSO in terms of optimality indicated by the length of the located path.

关键词： multivariant optimization algorithm shortest path planning heuristic search grid map optimality of algorithm

CD301b^(+) macrophage: the new booster for activating bone regeneration in periodontitis treatment

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International Journal of Oral Science 2023年第2期15卷 266-277页

作者： Can Wang Qin Zhao Chen Chen Jiaojiao Li Jing zhang Shuyuan Qu Hua Tang Hao Zeng yufeng zhang The State Key Laboratory Breeding Base of Basic Science of Stomatology(Hubei-MOST)&Key Laboratory of Oral Biomedicine Ministry of EducationSchool&Hospital of StomatologyWuhan UniversityWuhanChina Institute of Infection and Immunity Science and Technology Innovation CenterShandong First Medical University&Shandong Academy of Medical SciencesPR China Medical Research Institute School of MedicineWuhan UniversityWuhanChina Taikang Center for Life and Medical Sciences Wuhan UniversityWuhanChina

Periodontal bone regeneration is a major challenge in the treatment of *** the main obstacle is the difficulty of restoring the regenerative vitality of periodontal osteoblast lineages suppressed by inflammation,via conventional ***301b^(+)macrophages were recently identified as a subpopulation that is characteristic of a regenerative environment,but their role in periodontal bone repair has not been reported.

关键词： period inflammation treatment

Comparison of three flocculants for heavy cyanobacterial bloom mitigation and subsequent environmental impact

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Journal of Oceanology and Limnology 2022年第5期40卷 1764-1773页

作者： Kaixuan LIU Lei JIANG Jinsheng YANG Shuzhan MA Kaining CHEN yufeng zhang Xiaoli SHI Department of Environmental Science and Engineering Nanjing Tech UniversityNanjing 211816China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Jiangsu Collaborative Innovation Center of Regional Modern Agriculture&Environmental Protection Huaiyin Normal UniversityHuaiyin 223001China

Cyanobacteria can accumulate as a heavy biomass on the leeward side of large eutrophic lakes,posing a potential threat to public *** mitigating capacity of three flocculants and their potential impacts on the major environmental features of water and sediments was *** indicate that polyaluminum chloride(PAC)and ferric chloride(FeCl)are efficient flocculants that can rapidly mitigate cyanobacterial blooms with chlorophyll-a concentrations higher tnan 1500 ug/L within 15 *** comparison,cationic starch with chitosan could only treat cyanobacterial blooms in chlorophyll-a concentrations of less than 200μg/*** addition of FeClcaused a decline in the pH value,while dissolved oxygen in the water column dropped to 2 mg/L during cationic starch with chitosan treatment for a high cyanobacterial biomass ***,a combination of flocculants and oxygenators should be considered when treating high-concentration cyanobacterial blooms for emergency ***,the cell lysis of cyanobacteria caused by cationic starch with chitosan can result in an increase in total dissolved phosphorus and total dissolved ***,the high accumlation of nutrients in sediments after the settling of cyanobacteria can cause high internal phosphorus *** increase in the total organic carbon of the sediments can threaten lake restoration achieved by planting submerged macrophytes.

关键词： cyanobacterial bloom emergency control flocculants lake restoration

Rapid bioluminescence assay for monitoring rat CES1 activity and its alteration by traditional Chinese medicines

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Journal of Pharmaceutical Analysis 2020年第3期10卷 253-262页

作者： Jun zhang Dandan Wang Liwei Zou Min Xiao yufeng zhang Ziwei Li Ling Yang Guangbo Ge Zhong Zuo School of Pharmacy Faculty of MedicineThe Chinese University of Hong KongHong KongChina Institute of Interdisciplinary Medicine Shanghai University of Traditional Chinese MedicineShanghai201203China

In traditional Chinese medicine herbs(TCM),including Radix Salviae Miltiorrhizae(Danshen),Radix Puerariae Lobatae(Gegen),Radix Angelicae Sinensis(Danggui),and Rhizoma Chuanxiong(Chuanxiong)are widely used for the prevention and treatment of cardiovascular diseases and also often co-administered with Western drugs as a part of integrative medicine *** 1(CES1)plays a pivotal role in the metabolisms of pro-drugs,Since(S)-2-(2-(6-dimethylamino)-benzothiazole)-4,5-dihydrothiazole-4-carboxylate(NLMe)has recently been identified by us as a selective CES1 bioluminescent sensor,we developed a rapid method using this substrate for the direct measurement of CES1 activity in *** bioluminescence assay was applied to determine CES1 activity in rat tissues after a two-week oral administration of each of the four herbs noted *** results demonstrated the presence of CES1 enzyme in rat blood and all tested tissues with much higher enzyme activity in the blood,liver,kidney and heart than that in the small intestine,spleen,lung,pancreas,brain and *** addition,the four herbs showed tissue-specific effects on rat CES1 *** on the CES1 biodistribution and its changes after treatment in rats,the possibility that Danshen,Gegen and Danggui might alter CES1 activities in human blood and kidney should be *** summary,a selective and sensitive bioluminescence assay was developed to rapidly evaluate CES1 activity and the effects of orally administered TCMs in rats.

关键词： Traditional Chinese medicines Carboxylesterase 1(CES1) NLMe Bioluminescence assay Biomatrice in rats

Antibacterial effects of platelet-rich fibrin produced by horizontal centrifugation

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International Journal of Oral Science 2020年第4期12卷 309-316页

作者： Mengge Feng Yulan Wang Peng zhang Qin Zhao Shimin Yu Kailun Shen Richard J.Miron yufeng zhang State Key Laboratory Breeding Base of Basic Science of Stomatology(Hubei-MOST)and Key Laboratory of Oral Biomedicine Ministry of EducationSchool and Hospital of StomatologyWuhan UniversityWuhanChina Department of Periodontology School of Dental MedicineUniversity of BernBernSwitzerland Medical Research Institute School of MedicineWuhan UniversityWuhanChina

Platelet-rich fibrin(PRF)has been widely used owing to its ability to stimulate tissue *** date,few studies have described the antibacterial properties of ***,PRF prepared by horizontal centrifugation(H-PRF)was shown to contain more immune cells than leukocyte-and platelet-rich fibrin(L-PRF).This study aimed to compare the antimicrobial effects of PRFs against Staphylococcus aureus and Escherichia coli in vitro and to determine whether the antibacterial effects correlated with the number of immune *** samples were obtained from eight healthy donors to prepare L-PRF and *** sizes and weights of L-PRF and H-PRF were first evaluated,and their antibacterial effects against *** and *** were then tested in vitro using the inhibition ring and plate-counting test ***-cytometric analysis of the cell components of L-PRF and H-PRF was also *** significant differences in size or weight were observed between the L-PRF and H-PRF *** H-PRF group contained more leukocytes than the L-PRF *** both PRFs had notable antimicrobial activity against *** and ***,H-PRF demonstrated a significantly better antibacterial effect than ***,the antimicrobial ability of the PRF solid was less efficient than that of wet *** conclusion,H-PRF exhibited better antibacterial activity than L-PRF,which might have been attributed to having more immune cells.

关键词： fibrin Blood Platelet

Effect of radial heat conduction on effective thermal conductivity of carbon nanotube bundles

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Science China(Technological Sciences) 2018年第12期61卷 1959-1966页

作者： WANG JianLi SONG YaMei zhang yufeng HU YuHan YIN Hang GU YunFeng XIA Re CHEN YunFei Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments Southeast University College of Electronic and Mechanical Engineering Nanjing Forestry University Key Laboratory of Hydraulic Machinery Transients (Wuhan University) Ministry of Education

The effect of the radial heat conduction on the effective thermal conductivity of carbon nanotube(CNT) bundles is studied by the nonequilibrium molecular dynamics(NEMD) method. The hexagonal CNT bundle consists of seven(10, 10) single-walled carbon nanotubes(SWCNTs). The radial heat conduction is induced by creating the vacancy defects in some segments of the constituent CNTs. Combined with the temperature differences and the inter-tube thermal resistances at the different segments,the radial heat flow in the CNT bundle is calculated. The maximum percentage of the radial heat flow is less than 7% with the presence of four defective CNTs, while the resultant decrement of the effective thermal conductivity of the bundle is about 18%.The present results indicate that the radial heat flow can significantly diminish the axial heat conduction in the CNT bundles,which probably explains the smaller effective thermal conductivity in the CNT assemblies compared to that of the individual CNTs.

关键词： axial thermal conductivity carbon nanotube bundle inter-tube thermal resistance radial heat flow

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尿毒症患者血液透析整体护理的研究

智慧健康 2024年第13期10卷 155-158页

作者：刘会文张玉凤谭艳黄光墉深圳市宝安区福永人民医院广东深圳518000

目的研究整体护理运用于尿毒症患者血液透析中的价值。方法选取2020年12月—2021年12月本院接收的50例尿毒症血液透析患者,以随机排列法划分成A组和B组,每组25例。其中,A组实施常规护理,B组开展整体护理,比较各组护理前后的抑郁、焦虑... 详细信息

目的研究整体护理运用于尿毒症患者血液透析中的价值。方法选取2020年12月—2021年12月本院接收的50例尿毒症血液透析患者,以随机排列法划分成A组和B组,每组25例。其中,A组实施常规护理,B组开展整体护理,比较各组护理前后的抑郁、焦虑自评量表(SDS、SAS)、磷(P)、尿素氮(BUN)、肌酐(Scr)、β2-微球蛋白(β2-MC)、生活质量(SF-36)及并发症情况,比较两组护理结果。结果护理前,两组的SAS、SDS对比,差异无统计学意义(P>0.05);护理后,B组评分均低于A组,差异有统计学意义(P0.05);护理后,B组各指标均较A组降低,差异有统计学意义(P0.05);护理后,两组的各项SF-36评分均高于护理前,且B组较A组更高,差异有统计学意义(P<0.05)。B组并发症发生率低于A组,差异有统计学意义(P<0.05)。结论整体护理的效果更为理想,能够清除患者负面情绪,增强血液净化的作用,减少并发症,促进生活质量提升,值得推广。

关键词：整体护理尿毒症血液透析肾功能衰竭综合征