检索结果-南通市图书馆

Friction 2023年第7期11卷 1349-1358页

作者： Tianze HAO Huaping XIAO Shuhai liu yibo liu College of Mechanical and Transportation Engineering China University of Petroleum-BeijingBeijing 102249China

The core capabilities of soft grippers/soft robotic hands are grasping and *** present,most related research often improves the grasping and manipulation performance by structural *** soft grippers rely on compressive force and friction to achieve grasping,the influence of the surface microstructure is also *** types of fingerprint-inspired textures with relatively regular patterns were prepared on a silicone rubber surface via mold casting by imitating the three basic shapes of fingerprint patterns(i.e.,whorls,loops,and arches).Tribological experiments and tip pinch tests were performed using fingerprint-like silicone rubber films rubbing against glass in dry and lubricated conditions to examine their *** addition to the textured surface,a smooth silicone rubber surface was used as a *** results indicated that the coefficient of friction(COF)of the smooth surface was much higher than that of films with fingerprint-like textures in dry and water-lubricated *** surface with fingerprint-inspired textures achieved a higher COF in oil-lubricated *** the fingerprint-like films to the soft robotic fingers improved the tip pinch gripping performance of the soft robotic hand in lubricated *** study demonstrated that the surface texture design provided an effective method for regulating the grasping capability of humanoid robotic hands.

关键词： fingerprint-like patterns surface engineering soft hand tip pinch

Bubble behaviors of geldart B particle in a pseudo two-dimensional pressurized fluidized bed

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2023年第8期79卷 121-132页

作者： Xiaoli Zhu yibo liu Yuehuan Li Haigang Wang Zhenbo Wang College of New Energy China University of Petroleum(East China)Qingdao266580China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China

Pressurized fluidized beds have been developed in quite a few industrial applications because of intensified heat and mass transfer and chemical *** bubble behaviors under elevated pressure,strongly influencing the fluidization and reaction conversion of the whole system,are of great research *** this work,the bubble behaviors of Geldart B particle in a pseudo two-dimensional(2D)pressurized fluidized bed were experimentally studied based on digital image analysis *** effects of pressure and fluidization gas velocity on the general bubble behaviors(i.e.,size,shape and spatial distribution)and the dynamic characteristics,such as the time-evolution of voidage distribution and local flow regimes,were comprehensively *** show that increasing pressure re-duces the stability of bubbles and facilitates gas passing through the emulsion phase,resulting in the"smoother"fluidization state with smaller bubbles and declined bubble fraction and standard *** equivalent bubble diameter and bubble aspect ratio increase with the increasing gas velocity while decrease as pressure *** elevated pressure reduces bubbles extension in the vertical direction,prohibits the"short pass"of fluidization gas in large oblong bubbles/slugs and benefits the gas-solid *** flow regimes variation with gas velocity is affected by the elevated pressure,and demonstrates different features in different local positions of the bed.

关键词： Pressurized fluidizedbed Bubble behaviors Geldart Bparticle Local flowregimes Digital image analysis

Construction of Pd-doped RuO_(2) nanosheets for efficient and stable acidic water oxidation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Green Energy & Environment 2024年第6期9卷 937-948页

作者： yibo liu Xing Hu Chenxi liu Shan Zhu Kezhu Jiang Feng liu Shijian Zheng Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology College of Materials Science and EngineeringHebei University of TechnologyTianjin300401China Yunnan Precious Metals Lab Co. LTDKunming650100China

RuO_(2) has been considered a potential alternative to commercial IrO_(2) for the oxygen evolution reaction(OER)due to its superior intrinsic ***,its inherent structure dissolution in acidic environments restricts its commercial *** this study,we report a novel Pd-doped ruthenium oxide(Pd–RuO_(2))nanosheet catalyst that exhibits improved activity and stability through a synergistic effect of Pd modulation of Ru electronic structure and the two-dimensional *** catalyst exhibits excellent performance,achieving an overpotential of only 204 mVat a current density of 10 mA cm^(-2).Impressively,after undergoing 8000 cycles of cyclic voltammetry testing,the overpotential merely decreased by 5 *** PEM electrolyzer with Pd0.08Ru0.92O_(2) as an anode catalyst survived an almost 130 h operation at 200 mA cm^(-2).To elucidate the underlying mechanisms responsible for the enhanced stability,we conducted an X-ray photoelectron spectroscopy(XPS)analysis,which reveals that the electron transfer from Pd to Ru effectively circumvents the over-oxidation of Ru,thus playing a crucial role in enhancing the catalyst's ***,density functional theory(DFT)calculations provide compelling evidence that the introduction of Pd into RuO_(2) effectively modulates electron correlations and facilitates the electron transfer from Pd to Ru,thereby preventing the overoxidation of ***,the application of the two-dimensional structure effectively inhibited the aggregation and growth of nanoparticles,further bolstering the structural integrity of the catalyst.

关键词： Oxygen evolution reaction Pd-doped ruthenium oxide Two-dimensional structure Electron transfer Stability

Osteogenic peptides in collagen hydrolysates:Stimulate differentiation of MC3T3-E1 cells viaβ1 integrin-FAK-ERK1/2 signaling pathway and Smad1 protein

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Food Bioscience 2022年第3期47卷 1368-1377页

作者： yibo liu Shiming Li Hui liu Bo Li College of Food Science and Nutritional Engineering China Agricultural UniversityBeijing100083China

Our previous study demonstrated that orally administration of collagen hydrolysates from silver carp skin(SCH)could increase bone remodeling in chronologically aged ***,the active compounds and molecular mechanism were still *** this study,SCH showed strong activity in promoting osteogenic differentiation of MC3T3-E1 cells and the active components in it were separated by ultrafiltration and YMC ODS-A C18 *** then,a series of peptides containing potential osteogenic sequences were identified by LC-MS/MS and two novel peptides,GARGDKGETGEAGE(GE-14)and TGPRGPVGPA(TA-10),were synthesized for further *** results indicated that peptides GE-14 and TA-10 could promote the differentiation and mineralization of MC3T3-E1 cells by positively regulatingβ1 integrin-FAK-ERK1/2 and Smad1 pathway,which might be due to the RGD or GPR sequences in *** findings suggest that SCH has the potential to be developed as an effective diet supplement to prevent osteoporosis.

关键词： Silver carp skin Collagen hydrolysates Osteogenic activity MC3T3-E1 β1 integrin

Blade Segment with a 3D Lattice of Diamond Grits Fabricated via an Additive Manufacturing Process

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 Journal of Mechanical Engineering 2020年第5期33卷 185-196页

作者： Bin Chen Peng Chen Yongjun Huang Xiangxi Xu yibo liu Shuangxi Wang Intelligent Manufacturing Key Laboratory of Education Department of ChinaCollege of EngineeringShantou UniversityShantou 515063China Shantou Yuexi Machinery Equipment Co.Ltd Shantou 515000China Advanced Technology&Materials Co. LtdBeijing 100081China

Diamond tools with orderly arrangements of diamond grits have drawn considerable attention in the machining field owing to their outstanding advantages of high sharpness and long service *** diamond super tool,as well as the manufacturing equipment,has been unavailable to Chinese enterprises for a long time due to *** this paper,a diamond blade segment with a 3D lattice of diamond grits was additively manufactured using a new type of cold pressing equipment(AME100).The equipment,designed with a rotary working platform and 16 molding stations,can be used to additively manufacture segments with diamond grits arranged in an orderly fashion,layer by layer;under this additive manufacturing process,at least 216000 pcs of diamond green segments with five orderly arranged grit layers can be produced per *** microstructure of the segment was observed via SEM and the diamond blade fabricated using these segments was compared to other commercial cutting *** experimental results showed that the 3D lattice of diamond grits was formed in the green *** filling rate of diamond grits in the lattice could be guaranteed to be above 95%;this is much higher than the 90%filling rate of the automatic array system(ARIX).When used to cut stone,the cutting amount of the blade with segments made by AME100 is two times that of ordinary tools,with the same diamond *** used to dry cut reinforced concrete,its cutting speed is 10%faster than that of *** wet cutting conditions,its service life is twice that of *** applying the machine vision online inspection system and a special needle jig with a negative pressure system,this study developed a piece of additive manufacturing equipment for efficiently fabricating blade segments with a 3D lattice of diamond grits.

关键词： Diamond blade segment Additive manufacturing 3D lattice of diamond grits Cold pressing equipment Machine vision inspection

Mechanisms Influencing Learning Gains Under Information Security: Structural Equation Modeling with Mediating Effect

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2023年第6期36卷 3447-3468页

作者： Teng Zong Fengsi Wang Xin Wei yibo liu National University of Defense Technology Wuhan430000China Information Engineering University Zhengzhou450000China Henan University Zhengzhou450000China

With the expanding enrollments in higher education,the quality of col-lege education and the learning gains of students have attracted much *** is important to study the influencing factors and mechanisms of individual stu-dents’acquisition of learning gains to improve the quality of talent cultivation in ***,in the context of information security,the original data of learning situation surveys in various universities involve the security of educa-tional evaluation data and daily privacy of teachers and *** protect the original data,data feature mining and correlation analyses were performed at the model *** study selected 12,181 pieces of data from X University,which participated in the Chinese College Student Survey(CCSS)from 2018 to 2021.A confirmatory factor analysis was conducted and a structural equation modeling was conducted using AMOS *** hypothesis testing,this study explored the mechanisms that influence learning gains from the per-spectives of student involvement,teacher involvement,and school *** results indicated that the quality of student involvement has an important mediat-ing effect on learning gains and that a supportive campus environment has the greatest influence on learning *** positive emotional communica-tions between teachers and students is a more direct and effective method than improving the teaching level to improve the quality of student *** study discusses the implications of these results on the research and practice of connotative development in higher education.

关键词： Structural equation model mediating effect chinese college student survey learning gains

All-nanofiber self-powered PTFE/PA66 device for real-time breathing monitor by scalable solution blow spinning technology

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2022年第9期15卷 8458-8464页

作者： Pan Li yibo liu Han Zhang Zhiping Hu Luna Jia Dongkui liu Lu Yu Bo Li Youwei Yao School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Institute of Materials Research Tsinghua Shenzhen International Graduate SchoolShenzhen 518055China

All-nanofiber self-powered device was fabricated using simple,low-cost,safe,and scalable solution blow spinning(SBS)technology for real-time respiratory monitor and timely identification of respiratory obstruction ***(PTFE)and polyamide-66(PA66)nanofibers were selected as triboelectric pairs,owing to strong ability to gain electrons of PTFE and supply electrons of ***(ethylene oxide)(PEO)was added to regulate spinning solution viscosity and prepare PTFE/PEO nanofibers,and the morphology and diameter distribution of nanofibers were *** nanofiber film was obtained after the decomposition of PEO in PTFE/PEO nanofiber and melt flow of PTFE pellets in a limited region,and possessed a tensile strength of 1.05 MPa and elongation at a break of 288.58%.Later,PTFE/PA66 all-nanofiber self-powered device was constructed containing PA66 nanofibers,and Au deposition film was used as electrodes by magnetron *** as-obtained device showed robust electrical performance with an open circuit voltage of~110 V at a loading force of 10 N,a short-circuit current of~5 uA at a loading force of 10 N and a frequency of 4 Hz,a maximum power density of 562 mW·m^(–2),and a current of 3.1 uA at a loading resistance of 30 MΩ.Based on the triboelectric mechanism,the device possessed stable response and effective sensibility for stimuli,was used to monitor human breathing conditions,prevent suffocation,and distinguish slow,normal,and fast breathing,with an output voltage of~0.08 V perceived in one normal respiratory circle.

关键词： polytetrafluoroethylene(PTFE) nanofibers triboelectric flexible electronics

Changes of net primary productivity in China during recent 11 years detected using an ecological model driven by MODIS data

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2013年第1期7卷 112-127页

作者： yibo liu Weimin JU Honglin HE Shaoqiang WANG Rui SUN Yuandong ZHANG Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology Nanjing University Nanjing 210093 China International Institute for Earth System Science Nanjing University Nanjing 210093 China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China State Key Laboratory of Remote Sensing Science Jointly Sponsored by Beijing Normal University and Institute of Remote Sensing Applications of Chinese Academy of Sciences Beijing 100875 China Key Laboratory of Forest Ecology and Environment State Forestry Administration Institute of Forest Ecology Environment and Protection Chinese Academy of Forestry Beijing 100091 China

Net primary productivity （NPP） is an important component of the terrestrial carbon cycle. Accurately mapping the spatial-temporal variations of NPP in China is crucial for global carbon cycling study. In this study the process-based Boreal Ecosystem Productivity Simulator （BEPS） was employed to study the changes of NPP in China＇s ecosystems for the period from 2000 to 2010. The BEPS model was first validated using gross primary productivity （GPP） measured at typical flux sites and forest NPP measured at different regions. Then it was driven with leaf area index （LAI） inversed from the Moderate Resolution Imaging Spectroradiometer （MODIS） reflec- tance and land cover products and meteorological data interpolated from observations at753 national basic meteorological stations to simulate NPP at daily time steps and a spatial resolution of 500m from January 1, 2000 to December 31, 2010. Validations show that BEPS is able to capture the seasonal variations of tower-based GPP and the spatial variability of forest NPP in different regions of China. Estimated national total of annual NPP varied from 2.63 to 2.84Pg ***-1, averaging 2.74Pg ***-1 during the study period. Simulated terrestrial NPP shows spatial patterns decreasing from the east to the west and from the south to the north, in association with land cover types and climate. South-west China makes the largest contribution to the national total of NPP while NPP in the North-west account for only 3.97% of the national total. During the recent 11 years, the temporal changes of NPP were heterogamous. NPP increased in 63.8% of China＇s landmass, mainly in areas north of the Yangtze River and decreased in most areas of southern China, owing to the low temperature freezing in early 2008 and the severe drought in late 2009.

关键词： temporal and spatial variations NPP remotesensing MODIS data BEPS model

DeepOCL:A deep neural network for Object Constraint Language generation from unrestricted nature language

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2024年第1期9卷 250-263页

作者： Yilong Yang yibo liu Tianshu Bao Weiru Wang Nan Niu Yongfeng Yin School of Software Beihang UniversityBeijingChina College of Computer Science and Technology Guizhou UniversityGuiyangGuizhouChina Faculty of Information Technology Beijing University of TechnologyBeijingChina Department of Electrical Engineering and Computer Sciences University of CincinnatiCincinnatiOhioUSA

Object Constraint Language(OCL)is one kind of lightweight formal specification,which is widely used for software verification and validation in NASA and Object Management Group *** OCL provides a simple expressive syntax,it is hard for the developers to write correctly due to lacking knowledge of the mathematical foundations of the first-order logic,which is approximately half accurate at the first stage of devel-opment.A deep neural network named DeepOCL is proposed,which takes the unre-stricted natural language as inputs and automatically outputs the best-scored OCL candidates without requiring a domain conceptual model that is compulsively required in existing rule-based generation *** demonstrate the validity of our proposed approach,ablation experiments were conducted on a new sentence-aligned dataset named *** experiments show that the proposed DeepOCL can achieve state of the art for OCL statement generation,scored 74.30 on BLEU,and greatly outperformed experienced developers by 35.19%.The proposed approach is the first deep learning approach to generate the OCL expression from the natural *** can be further developed as a CASE tool for the software industry.

关键词： deep learning OCL software engineering

Synthesis, spectroscopic, and electrochemical properties of two dyads consisted of tetrathiafulvalene and carbazole

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2009年第2期3卷 192-195页

作者： Guoqiao LAI yibo liu Meijiang LI Yongjia SHEN Key Lab of Organosilicon Chemistry and Material Technology of Ministry of Education Hangzhou Normal UniversityHangzhou 310012China Laboratory for Advanced Materials and Institute of Fine Chemicals East China University of Science&TechnologyShanghai 200237China

Two donor-σ-acceptor molecules containing tetrathiafulvalene(TTF)and carbazole moieties were synthesized bythe reactionof 9-(4-bromo-butyl)-carbazole(1)with 2,6-bis(hexylthio)-3-(2-cyanoethylthio)-7-(methylthio)-tetrathiafulvalene(2)or2,6-bis(2-cyanoethylthio)-3,7-bis(methylthio)tetrathiafulvalene(3)in the presence of CsOH·H_(2)O,*** structures of the molecules were characterized by 1 H NMR,13 C NMR,MS,and elemental *** showed negligible intramolecu-lar charge-transfer interaction in their ground states as indicated by their UV-Vis spectroscopics and cyclic voltammetry *** with carbazole,their fluorescence was strongly quenched,which implied that a photo induced electron transfer(PET)interaction between TTF and carbazole moieties occurred.

关键词： donor-σ-acceptor molecule intramolecular charge transfer interaction photo induced electron transfer tetrathiafulvalene carbazole