检索结果-南通市图书馆

Dynamics and control of variable geometry truss manipulator

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2017年第2期38卷 243-262页

作者： Xiaofeng LIU Qishuai wang haiquan LI Guoping CAI Department of Engineering Mechanics State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai 200240 China

Variable geometry truss manipulator （VGTM） has potential to work in the future space applications, of which a dynamic model is important to dynamic analysis and control of the system. In this paper, an approach is presented to model the dynamic equations of a VGTM by independent variables, which consists of two double-octahedral truss units and a 3-revolute-prismatic-spherical （3-RPS） parallel manipulator. In this ap- proach, the kinematic recursive relations of two adjacent bodies and geometric constrains are used to deduce the kinematic equations of the VGTM, and Jourdain＇s velocity varia- tion principle is adopted to establish the dynamic equations of the system. The validity of the proposed dynamic model is verified by comparison of numerical simulations with the software ADAMS. Besides, an active controller for trajectory tracking of the system is designed by the computed torque method. The effectiveness of the controller is numer- ically proved.

关键词： variable geometry truss manipulator (VGTM) double-octahedral truss unit,3-revolute-prismatic-spherical (3-RPS) parallel manipulator dynamic modeling activecontrol

Sintering behaviour and microwave dielectric properties of MgO-2B_(2)O_(3)--xwt%BaCu(B_(2)O_(5))-ywt%H_(3)BO_(3) ceramics

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2021年第6期10卷 1282-1290页

作者： haiquan wang Shixuan LI Kangguo wang Xiuli CHEN Huanfu ZHOU Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi Key Laboratory of Nonferrous Materials and New Processing TechnologyMinistry of EducationSchool of Materials Science and EngineeringGuilin University of TechnologyGuilin 541004China

This study investigates the bulk density,sintering behaviour,and microwave dielectric properties of the MgO-2B_(2)O_(3) series ceramics synthesised by solid-state *** to the X-ray diffraction and microstructural analyses,the as-prepared MgO-2B_(2)O_(3) ceramics possess a single-phase structure with a rod-like *** effects of different quantities of H_(3)BO_(3) and BaCu(B_(2)O5)(BCB)on the bulk density,sintering behaviour,and microwave dielectric properties of the MgO-2B_(2)O_(3) ceramics were ***,the optimal sintering temperature was obtained by adding 30 wt%H_(3)BO_(3) and 8 wt%*** also reduced the sintering temperature to 825°***,the addition of 40 wt%H_(3)BO_(3) and 4 wt%BCB increased the quality factor,permittivity,and temperature coefficient of resonance frequency of MgO-2B_(2)O_(3) to 44,306 GHz(at 15 GHz),5.1,and-32 ppm/℃,*** properties make MgO-2B_(2)O_(3) a viable low-temperature co-fired ceramic with broad applications in microwave dielectrics.

关键词： low-temperature co-fired ceramics(LTCC) sintering temperature MgO-2B_(2)O_(3) H_(3)BO_(3) microwave dielectrics temperature coefficient of resonance frequency

Developments and challenges on enhancement of photocatalytic CO_(2)reduction through photocatalysis

在线全文

学校读者我要写书评

暂无评论

Carbon Resources Conversion 2024年第3期7卷 106-120页

作者： haiquan wang Qingjie Guo Hongyan Zhang Cheng Zuo College of Chemistry&Chemical and Environmental Engineering Weifang UniversityWeifangPeople’s Republic of China State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuanPeople’s Republic of China

The conversion of CO_(2)into high-value fuels and chemicals has garnered research interest *** conversion and utilization of CO_(2)has become one of the most urgent tasks for *** this context,using solar energy to convert CO_(2)into high-value fuels such as CH4 and CH_(3)OH has extremely high potential application ***,the research progress and results of applying various photocatalysts in photocatalytic CO_(2)reduction with various novel catalysts were ***,strategies for improving photocatalytic performance were ***,improving the catalytic mechanism of catalysts and designing novel highactivity,high-stability catalysts through comprehensive exploration of the reaction mechanism were suggested to meet the future requirements of industrial production.

关键词： CO_(2)photoreduction Photocatalyst Charge separation CO_(2)conversion technology

Research progress of MOF-based materials in the photocatalytic CO_(2)reduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Carbon Resources Conversion 2024年第1期7卷 103-121页

作者： Qian Su Qingjie Guo haiquan wang Meifang Liu Cheng Zuo College of Chemistry&Chemical and Environmental Engineering Weifang UniversityWeifangPeople’s Republic of China State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering College of Chemistry and Chemical EngineeringNingxia UniversityYinchuanPeople’s Republic of China

Photocatalytic technology could utilize solar energy to reduce CO_(2)into high-value-added fossil fuels,providing promising solutions for global energy and environmental ***-organic frameworks(MOFs)are a class of crystalline porous solids with high porosity and flexible ***-based photocatalysts have excellent CO_(2)capture ability,photochemical and structural characteristics and have shown infinite development potential in CO_(2)***,in practical large-scale applications,MOF-based photocatalysts still have some urgent problems to be solved,such as high composite rate of photogenerated carriers,limited response range to visible spectrum,poor photocatalytic activity and weak reduction *** paper introduces series of MOF-based photocatalysts,including pure MOF materials,compounds,and derivatives,were reviewed based on recent *** was placed on the modification strategy of photocatalysts,the photocatalytic reaction’s key physical and chemical parameters,and the mechanism of synergistic improvement of chemical fuel *** and most importantly,the future development trends and prospects of MOF-based catalysts for photocatalytic CO_(2)reduction were discussed.

关键词： Photocatalysis Metal-organic frameworks Rational design CO_(2)reduction

The characterization of protein lactylation in relation to cardiac metabolic reprogramming in neonatal mouse hearts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2024年第7期51卷 735-748页

作者： Tongyu Zhang Yingxi Zhu Xiaochen wang Danyang Chong haiquan wang Dandan Bu Mengfei Zhao Lei Fang Chaojun Li Ministry of Education Key Laboratory of Model Animals for Disease Study Model Animal Research CenterMedical School of Nanjing UniversityNational Resource Center for Mutant MiceNanjingJiangsu 210093China State Key Laboratory of Reproductive Medicine and Offspring Health China International Joint Research Center on Environment and Human HealthCenter for Global HealthSchool of Public HealthGusu SchoolNanjing Medical UniversityNanjingJiangsu 211166China

In mammals,the neonatal heart can regenerate upon injury within a short time after birth,while adults lose this *** reprogramming has been demonstrated to be critical for cardiomyocyte proliferation in the neonatal ***,we reveal that cardiac metabolic reprogramming could be regulated by altering global protein *** performing 4D label-free proteomics and lysine lactylation(Kla)omics analyses in mouse hearts at postnatal days 1,5,and 7,2297 Kla sites from 980 proteins are identified,among which 1262 Kla sites from 409 proteins are *** clustering analysis reveals that the proteins with altered Kla sites are mainly involved in metabolic *** expression and Kla levels of proteins in glycolysis show a positive correlation while a negative correlation in fatty acid ***,we verify the Kla levels of several differentially modified proteins,including ACAT1,ACADL,ACADVL,PFKM,PKM,and ***,our study reports a comprehensive Kla map in the neonatal mouse heart,which will help to understand the regulatory network of metabolic reprogramming and cardiac regeneration.

关键词： Lactylation Metabolicrep rogramming Postnatal heart regeneration Cell proliferation

Investigation of Fe-Ni-B and Fe-Cr-B Ultrafine Amorphous Alloy Powders Prepared by Chemical Reduction

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 1996年第1期3卷 19-23页

作者： Gang Bangwei Tan Zhaosheng Yi Ge wang haiquan Liu Zhihui wang Jianwen Cao Meng International Center for Material Physics Academic Sinica Department of Applied Physics Hunan University

Ultrafine amorphous alloy powders of spherical shape with diameters from 10 to 50nm for Fe-Ni-B and Fe-Cr-B were prepared by chemical reduction. The amorphous structure of two powders was identified by X-ray diffraction. The B concentrations for the two alloy systems did not change dramatically, as the preparation condition changed. An oxide film covered up the powders. The maximum magnetization decreased as increasing the content of Ni or Cr.

关键词： ultrafine powder amorphous alloy structure magnetic property chemical reduction

同方期刊数据库

Te-doped Fe_(3)O_(4) flower enabling low overpotential cycling of Li-CO_(2) batteries at high current density

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2024年第3期43卷 25-32页

作者： Huyi Yu Renshu Huang Qian Liu Xingfa Chen Tianqi Yu haiquan wang Xincheng Liang Shibin Yin Guangxi Key Laboratory of Electrochemical Energy Materials School of Chemistry and Chemical EngineeringGuangxi University100 Daxue RoadNanning530004China

Li-CO_(2)batteries(LCBs)suffer from high overpotentials caused by sluggish CO_(2)reaction *** work designs a Te-doped Fe_(3)O_(4)(Te-Fe_(3)O_(4))flower-like microsphere catalyst to lower the overpotential and improve the reversibility of *** results reveal that Te doping modifies the electronic structure of Fe_(3)O_(4)and reduces the *** stable Te-O bond between Te and C_(2)O^(2-)_(4)could effectively inhibit the dispro-portionation reaction of the latter,enabling the Te-Fe_(3)O_(4)cathodes to exhibit a remarkable capacity(9485 mAh g^(-1))and a long cycling life(155 cycles)with an overpotential of 1.21 V and an energy efficiency of about 80%at a high current density(2000 mA g^(-1)).Through the interaction between Te and Li_(2)C_(2)O_(4)to inhibit the dispro-portionation reaction,this work successfully achieves long-term cycling of LCBs with low overpotential at high current density.

关键词： Li-CO_(2)batteries Catalyst Tellurium Li_(2)C_(2)O_(4) Large current density

An improved bearing fault detection strategy based on artificial bee colony algorithm

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 2022年第4期7卷 570-581页

作者： haiquan wang Wenxuan Yue Shengjun Wen Xiaobin Xu Hans-Dietrich Haasis Menghao Su Ping liu Shanshan Zhang Panpan Du Zhongyuan Petersburg Aviation College Zhongyuan University of TechnologyZhengzhouChina Faculty of Electrical and Engineering Zhongyuan University of TechnologyZhengzhouChina School of Automation Hangzhou Dianzi UniversityHangzhouChina Maritime Business and Logistics University of BremenBremenGermany

The operating state of bearing affects the performance of rotating machinery;thus,how to accurately extract features from the original vibration signals and recognise the faulty parts as early as possible is very *** this study,the one‐dimensional ternary model which has been proved to be an effective statistical method in feature selection is introduced and shapelet transformation is proposed to calculate the parameter of one‐dimensional ternary model that is usually selected by trial and *** XGBoost is used to recognise the faults from the obtained features,and artificial bee colony algorithm(ABC)is introduced to optimise the parameters of ***,for improving the performance of intelligent algorithm,an improved strategy where the evolution is guided by the probability that the optimal solution appears in certain solution space is *** experimental results based on the failure vibration signal samples show that the average accuracy of fault signal recognition can reach 97%,which is much higher than the ones corresponding to traditional extraction *** with the help of improved ABC algorithm,the performance of XGBoost classifier could be optimised;the accuracy could be improved from 97.02%to 98.60%compared with the traditional classification strategy.

关键词： fault diagnosis feature extraction improved artificial bee colony algorithm improved one-dimensional ternary pattern method shapelet transformation

The gate to metabolic crossroads

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2021年第15期66卷 1488-1490,M0003页

作者： haiquan wang Chaojun Li Ministry of Education Key Laboratory of Model Animal for Disease Study Model Animal Research Center of the Medical SchoolNanjing UniversityNanjing 210093China

Glycerol is a simple polyhydroxy-three-carbon compound that is highly hydrophilic and is considered a central intermediate metabolite for cellular *** is found at the crossroads among several metabolic pathways,such as glycolysis and gluconeogenesis(for carbohydrates),lipogenesis,lipolysis,and glyceroneogenesis(for lipids),pentose-phosphate pathway(for nucleic acids),amino acid synthesis,and even energy generation by oxidative phosphorylation[1](Fig.1).

关键词： acids) oxidative synthesis