检索结果-南通市图书馆

Finite-time path following control of a sailboat with actuator failure and unknown sideslip angle

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第9期24卷 749-761页

作者： yujin WU Kangjian shao Ning WANG Zhongchao DENG Science and Technology on Underwater Vehicle Laboratory Harbin Engineering UniversityHarbin 150001China School of Marine Engineering Dalian Maritime UniversityDalian 116026China

Suffering from actuator failure and complex sideslip angle,the motion control of a sailboat becomes *** this paper,an improved double finite-time observer-based line-of-sight guidance and finite-time control(IDFLOS-FC)scheme is presented for path following of *** salient features of the proposed IDFLOS-FC scheme are as follows:(1)Considering the problem of actuator failure,an actuator failure model is introduced into the dynamics model of a sailboat.(2)The time-varying sideslip angle of the sailboat is accurately observed by the double finite-time sideslip observers(DFSOs),which reduces the error in line-of-sight(LOS)guidance.(3)A radial basis function(RBF)neural network is used to fit the uncertainty of the model,and the upper bound of the sum of fault effects and external disturbances is estimated based on adaptive theory,so that the controller has accurate tracking and interference suppression.(4)According to the Lyapunov method,the system is finite-time ***,simulation was used to validate the effectiveness of the method.

关键词： Sailboat Sideslip angle Sideslip angle observer Finite-time control(FC) Path following

二甲双胍联合艾塞那肽对新发初诊2型糖尿病患者胰岛功能的影响

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

临床荟萃 2017年第11期32卷 965-968页

作者：周瑞凤仲爽郭英孙玉金邵珠香潍坊医学院山东潍坊261053 潍坊医学院附属医院内分泌科山东潍坊261053

目的探讨二甲双胍联合艾塞那肽对新发初诊2型糖尿病(T2DM)患者胰岛功能的影响。方法将120例新发初诊T2DM患者随机分成4组:饮食+运动治疗组30例(A组),二甲双胍治疗组30例(B组),艾塞那肽治疗组30例(C组),二甲双胍+艾塞那肽治疗组30例(D组... 详细信息

目的探讨二甲双胍联合艾塞那肽对新发初诊2型糖尿病(T2DM)患者胰岛功能的影响。方法将120例新发初诊T2DM患者随机分成4组:饮食+运动治疗组30例(A组),二甲双胍治疗组30例(B组),艾塞那肽治疗组30例(C组),二甲双胍+艾塞那肽治疗组30例(D组)。检测血糖、胰岛素、胰高血糖素(GC)、胰高血糖素样肽1(GLP-1)等指标,计算胰岛素分泌指数(HOMA-β)、胰岛素抵抗指数(HOMA-IR)。结果治疗后B、C、D组HOMA-IR下降、HOMA-β升高(P<0.05)。治疗后:与A组比较,C、D组HOMA-IR下降,HOMA-β升高(P<0.05);与B组比较,C、D组HOMA-IR下降,HOMA-β升高(P<0.05);与C组比较,D组HOMA-IR下降,HOMA-β升高(P<0.05)。结论二甲双胍联合艾塞那肽可改善新发初诊T2DM患者的胰岛功能,且作用效果优于两药物单用。

关键词：糖尿病,2型二甲双胍胰岛

The Consumption-Stimulating Effect of Public Rental Housing in China

在线全文

学校读者我要写书评

暂无评论

China & World Economy 2022年第1期30卷 106-135页

作者： Xiaokuai shao yujin Cao Yangchuan Teng Jidong Chen Liutang Gong International Business School Beijing Foreign Studies UniversityChina Institute of Economic Research China Academy of MacroeconomicsChina Business School Beijing Normal UniversityChina School of Public Policy and Management Tsinghua UniversityChina School of International Economics and Management Beijing Technology and Business Universityand Guanghua School of ManagementPeking UniversityChina

China's public rental policy creates opportunities for poor households to rent apartments at low rental *** addition to such an impact,we argue that public rental housing increases the purchasing power of the poor and therefore enhances the income elasticity of consumption,i.e.,the percentage of consumption increment due to a 1 percent increase in *** on a nationwide dataset from China,the Chinese Household Income Project 2018,we find that public rental housing significantly increases the marginal impact of household disposable income on ***,our analysis suggests that public rental apartments could increase the income elasticity of consumption demand by 18 percent among all rental households and by 24 percent among rental households with below-average *** also find that the effect of public rental housing on income elasticity of consumption is stronger for service consumption than for nonservice *** results suggest that a well designed public rental policy could not only promote consumption in favor of the service industry but also alleviate the undesirable consequences of the unbalanced consumption structure caused by income inequality.

关键词： consumption elasticity of consumption income inequality public rental housing

Neoarchean Magmatic Events in the Western Songnen Massif,Central Asian Orogenic Belt:Timing and Tectonic Significance

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2023年第2期97卷 436-448页

作者： WU Xinwei LIU Zhenghong LIU Yongjiang ZHANG Chao shao Jun ZHANG Chao ZHANG yujin GUO Wei LIU Baoshan ZHANG Guangyu Shenyang Center of China Geological Survey Shenyang 110034China Key Laboratory of Deep Mineral Resources Exploration and Evaluation Department of Natural Resource of Liaoning ProvinceShenyang 110034China College of Earth Sciences Jilin UniversityChangchun 130061China Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Laboratory of Submarine Geosciences and Prospecting TechniquesMOE and College of Marine GeosciencesOcean University of ChinaQingdaoShandong 266100China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao Shandong 266100China School of Resources and Environmental Engineering Shandong University of TechnologyZiboShandong 255049China

Whether a Neoarchean basement existing in the Songnen massif is currently *** of Archean magmatism from the Songnen Massif is helpful to resolve this ***,we report newly discovered Neoarchean Shanquan pluton in the Western Songnen *** Neoarchean Shanquan pluton are mainly composed of granites that are exposed near the town of Shanquan in Heilongjiang ***-ICP-MS zircon U-Pb dating reveals that the sample 2015TW1 has an upper intercept age of 2801±69 Ma and a weighted mean age of 2708±18 Ma,while samples LJ27QY1 and LJ27QY2 have upper intercept ages of 2677±57 Ma and 2653±18 Ma,and weighted mean ages of 2649±10 Ma and 2653±15 Ma,*** indicates that these granites were formed at~2.7 *** of the~2.7 Ga zircons have older TDM2 ages of 2762–3326 Ma with positiveεHf(t)values ranging from 0 to 6.4,while a few of the zircons have negativeεHf(t)values ranging from-8.1 to-11.5 and older TDM2 ages varying from 3158 to 3264 *** zircon Hf isotopes indicate that Paleo-Mesoarchean crusts might once existed in the Songnen Massif,and the studied Neoarchean magmas were principally derived from partial melting of these Paleo-Mesoarchean ancient *** on the geochronological spectrum of magmatic and detrital zircons,the Songnen,Erguna,Jiamusi,Bureya massifs may have a common basement prior to the Neoproterozoic and may even be linked with the Triam Craton.

关键词： tectonic attribute Neoarchean magmatism Precambrian basement Longjiang area Songnen Massif

An all-metallic nanovesicle for hydrogen oxidation

在线全文

学校读者我要写书评

暂无评论

National Science Review 2024年第6期11卷 233-242页

作者： Juntao Zhang Lujie Jin Hao Sun Xiaozhi Liu yujin Ji Youyong Li Wei Liu Dong Su Xuerui Liu Zhongbin Zhuang Zhiwei Hu Qi shao Xiaoqing Huang State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Xiamen University Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Key Laboratory for Special Functional Materials of Ministry of Education National &Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology School of Materials Science and EngineeringCollaborative Innovation Center of Nano Functional Materials and Applications Henan University Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials& Devices Soochow University State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences State Key Lab of Organic-Inorganic Composites Beijing University of Chemical Technology Max Planck Institute for Chemical Physics of Solids College of Chemistry and Chemical Engineering and Materials Science Soochow University

Vesicle, a microscopic unit that encloses a volume with an ultrathin wall, is ubiquitous in ***, it remains a huge challenge to create its inorganic metal-based artificial counterparts. Here,inspired by the formation of biological vesicles, we proposed a novel biomimetic strategy of curling the ultrathin nanosheets into nanovesicles, which was driven by the interfacial strain. Trapped by the interfacial strain between the initially formed substrate Rh layer and subsequently formed RhRu overlayer, the nanosheet begins to deform in order to release a certain amount of strain. Density functional theory（DFT）calculations reveal that the Ru atoms make the curling of nanosheets more favorable in thermodynamics applications. Owing to the unique vesicular structure, the RhRu nanovesicles/C displays excellent hydrogen oxidation reaction（HOR） activity and stability, which has been proven by both experiments and DFT calculations. Specifically, the HOR mass activity of RhRu nanovesicles/C are 7.52 A mg（Rh+Ru）-1at an overpotential of 50 m V at the rotating disk electrode（RDE） level; this is 24.19 times that of commercial Pt/C(0.31 m A mgPt-1). Moreover, the hydroxide exchange membrane fuel cell（HEMFC） with RhRu nanovesicles/C displays a peak power density of 1.62 W cm-2in the H2-O2condition, much better than that of commercial Pt/C(1.18 W cm-2). This work creates a new biomimetic strategy to synthesize inorganic nanomaterials, paving a pathway for designing catalytic reactors.

关键词： biomimetic synthesis nanovesicle interfacial strain hydrogen oxidation reaction

Core@shell structured Au@Sn O2 nanoparticles with improved N2 adsorption/activation and electrical conductivity for efficient N2 fixation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2020年第5期65卷 350-358页

作者： Pengtang Wang yujin Ji Qi shao Youyong Li Xiaoqing Huang College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China

The design of electrocatalysts with enhanced adsorption and activation of nitrogen(N2)is critical for boosting the electrochemical N2reduction(ENR).Herein,we developed an efficient strategy to facilitate N2 adsorption and activation for N2 electroreduction into ammonia(NH3)by vacancy engineering of core@shell structured Au@Sn O2 nanoparticles(NPs).We found that the ultrathin amorphous SnO2 shell with enriched oxygen vacancies was conducive to adsorb N2as well as promoted the N2 activation,meanwhile the metallic Au core ensured the good electrical conductivity for accelerating electrons transport during the electrochemical N2 reduction reaction,synergistically boosting the N2 electroreduction *** confirmed by the15N-labeling and controlled experiments,the core@shell Au@amorphous SnO2 NPs with abundant oxygen vacancies show the best performance for N2 electroreduction with the NH3 yield rate of 21.9 lg h-1mg-1catand faradaic efficiency of 15.2%at-10.2 VRHE,which surpass the Au@crystalline SnO2 NPs,individual Au NPs and all reported Au-based catalysts for ENR.

关键词： Core@shell Electroreduction Nitrogen fixation Vacancy engineering Amorphous

30ZrC_P/W复合材料的高温压缩变形流变应力行为

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2005年第3期34卷 385-388页

作者：张太全王玉金周玉宋桂明雷廷权邵颖峰哈尔滨工业大学黑龙江哈尔滨150001

在Gleeble-1500D热模拟实验机上对30ZrCp/W复合材料进行高温压缩实验,变形温度和应变速率分别为800℃～1 200℃和10-3 s-1～1 s-1,研究其高温压缩变形的流变应力行为.研究表明:随变形温度升高,复合材料的流变应力下降,在10-3s-1和1 200... 详细信息

在Gleeble-1500D热模拟实验机上对30ZrCp/W复合材料进行高温压缩实验,变形温度和应变速率分别为800℃～1 200℃和10-3 s-1～1 s-1,研究其高温压缩变形的流变应力行为.研究表明:随变形温度升高,复合材料的流变应力下降,在10-3s-1和1 200℃下,抗压强度为948.7 MPa.在800℃下发生伪塑性变形,未达到预设变形量,真应力-真应变曲线上表现出的塑性为伪塑性,其是由微裂纹的萌生-钝化引起的.随变形温度升高,复合材料发生动态回复再结晶.随应变速率升高,真应力-真应变曲线形状从'锯齿'型向'平滑'型转变.复合材料对应变速率不敏感,随应变速率升高,复合材料的流变应力略有升高.在800℃和1 s-1下,复合材料的抗压强度为1 176.9 MPa.用Arrhenius方程描述复合材料在1 000℃～1 200℃的热变形行为,变形激活能为811.4 kJ/mol.

关键词： 30ZrCp/W复合材料高温压缩流变应力抗压强度变形激活能

含多类型电源的电力系统光热发电效益评估方法

在线全文

学校读者我要写书评

暂无评论

电力工程技术 2022年第1期41卷 213-218页

作者：傅旭王进军张雨津孙沛李富春邵成成中国电力工程顾问集团西北电力设计院有限公司陕西西安710075 西安交通大学电气工程学院陕西西安710049

光热发电(CSP)在电力系统中发挥的效益与CSP的运行方式、储热时长等密切相关,合理评估CSP效益对CSP的发展具有重要影响。文中提出一种全面评估CSP容量效益、电量效益的等值年费用法,并计及了机组启停、储能电源跨日调节。对含有CSP的系... 详细信息

光热发电(CSP)在电力系统中发挥的效益与CSP的运行方式、储热时长等密切相关,合理评估CSP效益对CSP的发展具有重要影响。文中提出一种全面评估CSP容量效益、电量效益的等值年费用法,并计及了机组启停、储能电源跨日调节。对含有CSP的系统进行8760 h生产仿真模拟,比较CSP投运前后系统火电装机需求和煤耗的变化,评估CSP的容量效益和电量效益,进而评估CSP的国民经济性。对西北地区实际电网进行仿真,仿真结果验证了所提方法的有效性。研究结果表明:CSP的国民经济效益与CSP的投资、调峰方式、储热时长和新能源发电规模相关。相较于以光热发电量最大为目标的CSP不参与调峰运行,CSP参与调峰运行时其国民经济性更优。

关键词：光热发电(CSP) 新能源发电容量效益电量效益新能源弃电率煤耗

在线全文

学校读者我要写书评

暂无评论

鲢鱼与金线鱼混合鱼糜的凝胶特性

食品科学 2016年第5期37卷 17-22页

作者：余永名仪淑敏徐永霞邵俊花励建荣李钰金季广仁渤海大学食品科学与工程学院辽宁省食品安全重点实验室生鲜农产品贮藏加工及安全控制技术国家地方联合工程研究中心辽宁锦州121013 泰祥集团荣成泰祥食品股份有限公司山东荣成264300 锦州笔架山食品有限公司辽宁锦州121000

为研究鲢鱼与金线鱼混合鱼糜的凝胶特性,本实验对混合鱼糜凝胶的凝胶强度、持水性、蒸煮损失、白度值、横向弛豫时间、微观结构和肌原纤维蛋白进行分析。结果表明:混合鱼糜的白度值较纯金线鱼鱼糜显著提高(P<0.05),且鲢鱼鱼糜与金线鱼... 详细信息

为研究鲢鱼与金线鱼混合鱼糜的凝胶特性,本实验对混合鱼糜凝胶的凝胶强度、持水性、蒸煮损失、白度值、横向弛豫时间、微观结构和肌原纤维蛋白进行分析。结果表明:混合鱼糜的白度值较纯金线鱼鱼糜显著提高(P<0.05),且鲢鱼鱼糜与金线鱼鱼糜质量比5∶1混合后的凝胶白度值高于纯鲢鱼鱼糜;此配比下的混合鱼糜凝胶性能最好,其中凝胶破断力、凹陷距离、凝胶强度和持水性较鲢鱼鱼糜分别提高了18.33%、27.29%、51.01%和5.65%,较金线鱼鱼糜分别提高了5.84%、19.50%、26.49%和3.45%;该配比下的混合鱼糜凝胶的蒸煮损失较鲢鱼鱼糜和金线鱼鱼糜分别降低了15.88%和7.48%。低场核磁共振分析显示鲢鱼鱼糜与金线鱼鱼糜质量比5∶1混合后的鱼糜凝胶的横向弛豫时间T_(22)比鲢鱼鱼糜凝胶T_(22)缩短了10.34 ms。通过扫描电镜观察发现鲢鱼鱼糜与金线鱼鱼糜质量比5∶1混合时可形成高度均匀、致密的空间凝胶网络结构。肌原纤维蛋白凝胶电泳图显示该配比下肌球蛋白重链(myosin heavy china,MHC)发生交联,大分子聚集体形成,进入凝胶中MHC更少,条带更细窄。

关键词：鲢鱼金线鱼混合鱼糜凝胶特性微观结构横向弛豫时间