检索结果-南通市图书馆

Metal surface wettability modification by nanosecond laser surface texturing:A review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biosurface and Biotribology 2022年第2期8卷 95-120页

作者： Zhifang Liu tong niu Yaxi Lei Yuanxin Luo Chongqing University of Technology ChongqingChina Chongqing University College of Mechanical and Vehicle EngineeringChongqingChina China Academy of Engineering Physics MianyangSichuanChina Chongqing University ChongqingChina Correspondence

Laser surface texturing(LST)is a non-contact manufacturing process for fabricating functional surfaces in a manner that improves the corresponding wettability,and is widely used in biomedicine and *** surface texturing is a facile approach that is compatible with various materials,can result in a hierarchical texture,and enables a high degree of surface wetting(i.e.,extreme wetting).In addition to surface structures,surface chemical modification is a primary factor in producing extreme wetting *** review discusses the effects of various surface textures and surface chemistries on *** laser parameters for the desired surface texture are based on the fundamental wettability and laser *** particular,bumps in the morphology are conducive to obtaining extreme *** surface chemical strategies result in extreme wetting by different *** paper makes a rigorous evaluation of the laser parameters and optimal surface chemical modifications by elucidating the relationships between the surface structure,surface chemical modification,and wettability,and in so doing,determines the final *** unresolved problems of LST are presented in the *** review provides guidance,development directions,and an integrated framework for LST,which will be useful for fabricating extreme wetting surfaces on various metals.

关键词： extreme wetting surface laser surface texturing nanosecond laser wettability

Review of Clustering Technology and Its Application in Coordinating Vehicle Subsystems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Automotive Innovation 2023年第1期6卷 89-115页

作者： Caizhi Zhang Weifeng Huang tong niu Zhitao Liu Guofa Li Dongpu Cao Chongqing Automotive Collaborative Innovation Centre The State Key Laboratory of Mechanical TransmissionsChongqing UniversityChongqing 400044China State Key Laboratory of Industrial Control Technology Institute of Cyber‑Systems and ControlZhejiang UniversityHangzhou 310027China School of Vehicle and Mobility Tsinghua UniversityBeijingChina

Clustering is an unsupervised learning technology,and it groups information(observations or datasets)according to similarity *** clustering algorithms is a hot topic in recent years,and this area develops rapidly with the increasing complexity of data and the volume of *** this paper,the concept of clustering is introduced,and the clustering technologies are analyzed from traditional and modern ***,this paper summarizes the principles,advantages,and disadvantages of 20 traditional clustering algorithms and 4 modern ***,the core elements of clustering are presented,such as similarity measures and evaluation *** that data processing is often applied in vehicle engineering,finally,some specific applications of clustering algorithms in vehicles are listed and the future development of clustering in the era of big data is *** purpose of this review is to make a comprehensive survey that helps readers learn various clustering algorithms and choose the appropriate methods to use,especially in vehicles.

关键词： Unsupervised learning Clustering Similarity measures Vehicle

Tightness and sweet spot formation in moldic-pore-type dolomite reservoirs: The middle Ordovician Majiagou Formation in the eastern Ordos Basin, central China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum 2019年第4期5卷 341-351页

作者： tong niu Kai Hu Di Xiao Xing Gao Juanping Chen Jian Cao MOE Key Laboratory of Surficial Geochemistry School of Earth Sciences and EngineeringNanjing UniversityNanjing210023China Research Institute of Petroleum Exploration and Development PetroChina Changqing Oilfield CompanyXi'an710018China

The diagenetic evolution of the moldic-pore-containing gypsum dolomites of the Middle Ordovician Majiagou Formation in the eastern Ordos Basin,central China,was studied by means of petrological,mineralogical,and geochemical analyses,to improve our understanding of heterogeneity in high-quality *** aim of the study was to elucidate the processes that resulted in reservoir tightness and the formation of sweet spots,to guide future *** show that the moldic-pore-containing gypsum dolomites are the most favorable reservoir in the study area,with a mean porosity of 4.96%and a mean permeability of 0.748 *** development and preservation of gypsum moldic pores were the main factors causing reservoir ***,moldic pore development was controlled by the sedimentary microfacies,whereas pore preservation was related to dissolution and filling during telogenetic *** were three main dissolution-filling stages that took place in three settings:penecontemporaneous,epigenetic,and *** processes controlled the formation of reservoir sweet ***-consolidated dolomite deposits were frequently exposed to the atmosphere in the penecontemporaneous environment under the influence of high-frequency sedimentary cycles,which led to the dissolution of evaporite minerals and consequent formation of gypsum moldic pores,accompanied by infilling by freshwater *** epigenesis,the porosity initially increased due to karstification,then significantly decreased because of calcite infilling resulting from long subaerial exposure(120 Myr),which contributed to reservoir ***,during burial the high-temperature and high-pressure conditions led to chemical compaction and continuous tightening of the reservoir,although some burial dissolution also took *** conclusion,the variable paleo-topography resulted in differences in the intensity of pore filling among the blocks in the study area,resulting in re

关键词： Dolomite Tight carbonate rock Gypsum moldic pores Dissolution Middle Ordovician Majiagou Formation Ordos Basin

Preparation of AlN film grown on sputter-deposited and annealed AlN buffer layer via HVPE

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第3期30卷 430-435页

作者： Di-Di Li Jing-Jing Chen Xu-Jun Su Jun Huang Mu-tong niu Jin-tong Xu Ke Xu Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of SciencesSuzhou 215123China Suzhou Nanowin Science and Technology Co. Ltd.Suzhou 215123China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Key Laboratory of Infrared Imaging Materials and Detectors Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China

AlN films grown on sputter-deposited and annealed AlN buffer layer by high temperature hydride vapor phase epitaxy(HVPE)have been fabricated and structurally *** crystalline quality and surface morphology of as-grown AlN films with various V/III ratios were studied and *** XRD results showed that the crystalline quality of the AlN film could be optimized when the growth V/III ratio was *** the same time,the full width at half-maximum(FWHM)values of(0002)-and(10¯12)-plane were 64 arcsec and 648 arcsec,*** revealed by AFM,the AlN films grown with higher V/III ratios of 150 and 300 exhibited apparent hillock-like surface structure due to the low density of screw threading dislocation(TD).The defects microstructure and strain field around the HVPE-AlN/sputtered-AlN/sapphire interfaces have been investigated by transmission electron microscopy(TEM)technique combined with geometric phase analysis(GPA).It was found that the screw TDs within AlN films intend to turn into loops or half-loops after originating from the AlN/sapphire interface,while the edge ones would bend first and then reacted with others within a region of 400 nm above the ***,part of the edge TDs propagated to the surface *** GPA analysis indicated that the voids extending from sapphire to HVPE-AlN layer were beneficial to relax the interfacial strain of the best quality AlN film grown with a V/III ratio of 150.

关键词： hydride vapor phase epitaxy(HVPE) AlN threading dislocation(TD) sputter-deposition

Study of degradation of fuel cell stack based on the collected high-dimensional data and clustering algorithms calculations

在线全文

学校读者我要写书评

暂无评论

Energy and AI 2022年第4期10卷 29-40页

作者： tong niu Weifeng Huang Caizhi Zhang Tao Zeng Jiawei Chen Yu Li Yang Liu College of mechanical and vehicle engineering The State Key Laboratory of Mechanical TransmissionsChongqing Automotive Collaborative Innovation CentreChongqing UniversityChongqing 400044China School of Electrical Engineering Chongqing UniversityChongqing 400044China Propulsion Research Institute of Chongqing Changan New Energy Vehicle Technology Co. LtdChongqingChina School of Automation Chongqing UniversityChongqing 400044China Institute of Sustainable Energy/College of Sciences Shanghai universityShanghai 200444China Sichuan Energy Internet Research Institute Tsinghua UniversityChengduSichuan 610213China Shaoxing Institute of Technology Shanghai UniversityShaoxingZhejiang 312000China

Accurate perception of the performance degradation of fuel cell is very important to detect its health ***,inconsistent operating conditions of fuel cell vehicles in the test result in errors in the *** order to obtain a more credible degradation rate,this study proposes a novel method to classify the experimental data collected under different working conditions into similar operating conditions by using dimensionality reduction and clustering ***,the experimental data collected from fuel cell vehicles belong to high-dimensional *** projecting high-dimensional data into three-dimensional feature vector space via principal component analysis(PCA).The dimension-reduced three-dimensional feature vectors are input into the clustering algorithm,such as K-means and density-based noise application spatial clustering(DBSCAN).According to the clustering results,the fuel cell voltage data with similar operating conditions can be ***,the selected voltage data can be used to precisely represent the true performance degradation of an on-board fuel cell *** results show that the voltage using the K-means algorithm declines the fastest,followed by the DBSCAN algorithm, finally the original data, which indicates that the performance of the fuel cell actually declines faste. Early intervention can prolong its life to the greatest extent.

关键词： Fuel cell vehicle Principal component analysis Clustering algorithms Degradation of fuel cell

Influence comparison of N2 and NH3 nitrogen sources on AlN films grown by halide vapor phase epitaxy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第7期29卷 428-432页

作者： Jing-Jing Chen Jun Huang Xu-Jun Su Mu-tong niu Ke Xu Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of SciencesSuzhou 215123China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Suzhou Nanowin Science and Technology Co. Ltd.Suzhou 215123China

A comparison of the nitrogen sources(N2 and NH3)influence on AlN films grown by high-temperature halide vapor phase epitaxy(HVPE)is *** x-ray rocking curves(XRCs)indicate that the full width at half maximum(FWHM)of(0002)plane for AlN films using N2 as nitrogen source is generally smaller than that using *** microscope and atomic force microscope(AFM)results show that it is presently still more difficult to control the crack and surface morphology of AlN films with thicknesses of 5-10µm using N2 as the nitrogen source compared to that using *** with one-step growth,two-step growth strategy has been proved more effective in stress control and reducing the density of threading dislocations for AlN epilayers using N2 as the nitrogen *** investigations reveal that using N2 as nitrogen source in HVPE growth of AlN is immature at present,but exhibits great potential.

关键词： aluminum nitride halide vapor phase epitaxy surface structure nitrogen source

在线全文

学校读者我要写书评

暂无评论

再制造公差设计优化模型及其应用

计算机集成制造系统 2011年第2期17卷 232-238页

作者：牛同训山东工业职业学院机电工程系山东淄博256414 东南大学机械工程学院江苏南京211189

为降低再制造产品的成本,保证和提高产品质量,将公差设计方法引入再制造工程。在深入分析再制造公差设计特点和公差分配原则的基础上,提出了一个再制造公差设计的优化数学模型。该模型以统计公差原理为基础,以再制造总成本最低为目标,... 详细信息

为降低再制造产品的成本,保证和提高产品质量,将公差设计方法引入再制造工程。在深入分析再制造公差设计特点和公差分配原则的基础上,提出了一个再制造公差设计的优化数学模型。该模型以统计公差原理为基础,以再制造总成本最低为目标,综合考虑了保证和提高产品性能、表面工程技术、过程能力指数等制约因素,在质量成本中的田口质量损失成本的基础上增加了质量保证成本。结合某企业ZQDR-410型牵引电动机的再制造案例,对传统再制造方案和所提方案进行了比较,证明了该公差设计优化模型的有效性和实用性。

关键词：再制造公差设计优化模型过程能力指数电机

Lack of association between apolipoprotein C3 gene polymorphisms and risk of nonalcoholic fatty liver disease in a Chinese Han population

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第13期20卷 ing3655-3662页

作者： tong-Hong niu Man Jiang Yong-Ning Xin Xiang-Jun Jiang Zhong-Hua Lin Shi-Ying Xuan Medical College of Qingdao University Department of Gastroenterology Qingdao Municipal Hospital

AIM: To investigate the association between two polymorphisms of apolipoprotein C3 (APOC3) and risk of nonalcoholic fatty liver disease (NAFLD) in a Chinese Han population.

关键词： Polymorphism Single nucleotide Nonalcoholic fatty liver disease Apolipoprotein C3 Insulin resistance Oxidative stress

Transcriptome analysis suggests broad jejunal alterations in Linghu’s obesity-diarrhea syndrome:A pilot study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第21期30卷 2777-2792页

作者： Xiao-tong niu Xiang-Yao Wang Yan Wang Ke Han Nan Ru Jing-Yuan Xiang En-Qiang Linghu Medical School of Chinese PLA Chinese PLA General HospitalBeijing 100853China Department of Gastroenterology The First Medical Center of Chinese PLA General HospitalBeijing 100853China School of Medicine Nankai UniversityTianjin 300071China

BACKGROUND Obesity is associated with a significantly increased risk for chronic diarrhea,which has been proposed as Linghu’s obesity-diarrhea syndrome(ODS);however,its molecular mechanisms are largely *** To reveal the transcriptomic changes in the jejunum involved in *** In a cohort of 6 ODS patients(JOD group),6 obese people without diarrhea(JO group),and 6 healthy controls(JC group),high-throughput sequencing and bioinformatics analyses were performed to identify jejunal mucosal mRNA expression alterations and dysfunctional biological *** another cohort of 16 ODS patients(SOD group),16 obese people without diarrhea(SO group),and 16 healthy controls(SC group),serum diamine oxidase(DAO)and D-lactate(DLA)concentrations were detected to assess changes in intestinal barrier *** The gene expression profiles of jejunal mucosa in the JO and JC groups were similar,with only 1 differentially expressed gene(DEG).The gene expression profile of the JOD group was significantly changed,with 411 DEGs compared with the JO group and 211 DEGs compared with the JC group,129 of which *** enrichment analysis of these DEGs showed that the biological processes such as digestion,absorption,and transport of nutrients(especially lipids)tended to be up-regulated in the JOD group,while the biological processes such as rRNA processing,mitochondrial translation,antimicrobial humoral response,DNA replication,and DNA repair tended to be down-regulated in the JOD *** DEGs(CDT1,NHP2,EXOSC5,EPN3,NME1,REG3A,PLA2G2A,and PRSS2)may play a key regulatory role in the pathological process of ODS,and their expression levels were significantly decreased in ODS patients(P<0.001).In the second cohort,compared with healthy controls,the levels of serum intestinal barrier function markers(DAO and D-LA)were significantly increased in all obese individuals(P<0.01),but were higher in the SOD group than in the SO group(P<0.001).CONCLUSION Compared with health

关键词： Obesity Chronic diarrhea Jejunum Transcriptome Intestinal barrier