检索结果-南通市图书馆

Journal of Energy Chemistry 2024年第6期93卷 16-23,I0002页

作者： Yihong Tong Ruicheng Cao Guanghui xu Yifeng Xia hongyuan xu Hong Jin Hui xu Xi’an Jiaotong University Suzhou Academy Suzhou 215123JiangsuChina Nano Science and Technology Institute University of Science and Technology of ChinaSuzhou 215123JiangsuChina

Free-standing silicon anodes with high proportion of active materials have aroused great attention;however,the mechanical stability and electrochemical performance are severely ***,to resolve the appeal issues,a free-standing anode with a"corrugated paper"shape on micro-scale and a topological crosslinking network on the submicron and nano-scale is ***,an integrated three-dimensional electrode structure is constructed based on robust carbon nanotubes network with firmly anchored SiNPs via forming interlocking *** which,the hierarchical interlocking structure is achieved by directional induction of the binder,which ensures well integration during cycling so that significantly enhances mechanical stability as well as electronic and ionic conductivity of *** from it,this anode exhibits outsta nding performance under harsh service conditions including high Si loading,ultrahigh areal capacity(33.2 mA h cm^(-2)),and high/low temperatures(-15-60℃),which significantly extends its practical ***,the optimization mechanism of this electrode is explored to verify the crack-healing and structure-integration maintaining along cycling via a unique self-stabilization ***,from both the fundamental and engineering views,this strategy offers a promising path to produce high-performance free-standing electrodes for flexible device applications especially facing volume effect challenges.

关键词： Topological network Self-stabilization Flexibility Free-standing Silicon anode

Experimental Study of the Pressure Fluctuations in a Pump Turbine at Large Partial Flow Conditions

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2012年第6期25卷 1205-1209页

作者： RAN Hongjuan LUO Xianwu ZHU Lei ZHANG Yao WANG Xin xu hongyuan State Key Laboratory of Hydroscience & Engineering Tsinghua University Beijing 100084 China Laboratory of Hydraulic Machine Swiss Federal Institute of Technology Zurich Lausanne Switzerland

Frequent shifts of output and operating mode require a pump turbine with excellent stability. Current researches show that large partial flow conditions in pump mode experience positive-slope phenomena with a large head drop. The pressure fluctuation at the positive slope is crucial to the pump turbine unit safety. The operating instabilities at large partial flow conditions for a pump turbine are analyzed. The hydraulic performance of a model pump turbine is tested with the pressure fluctuations measured at unstable operating points near a positive slope in the performance curve. The hydraulic performance tests show that there are two separated positive-slope regions for the pump turbine, with the flow discharge for the first positive slope from 0.85 to 0.91 times that at the maximum efficiency point. The amplitudes of the pressure fluctuations at these unstable large partial flow conditions near the first positive slope are much larger than those at stable operating condtions. A dominant frequency is measured at 0.2 times the impeller rotational frequency in the flow passage near the impeller exit, which is believed to be induced by the rotating stall in the flow passage of the wicket gates. The test results also show hysteresis with pressure fluctuations when the pump turbine is operated near the first positive slope. The hysteresis creates different pressure fluctuations for those operation points even though their flow rates and heads are similar respectively. The pressure fluctuation characteristics at large partial flow conditions obtained by the present study will be helpful for the safe operation of pumped storage units.

关键词： positive slope pressure fluctuation rotating stall pump turbine

A miniature pump with a fluid dynamic bearing

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2012年第3期55卷 795-801页

作者： LUO XianWu JI Bin ZHUANG BaoTang ZHU Lei LU Li xu hongyuan State Key Laboratory of Hydro Science and Engineering Tsinghua UniversityBeijing 100084China Beijing Institute of Control Engineering Beijing 100190China China Institute of Water Resources and Hydropower Research Beijing 100038China

This paper describes the development of a miniature pump having an impeller with an exit diameter of 24 mm supported with the motor rotor by a fluid dynamic beating. Tests verify that the miniature pump is stable and quiet for rotational speeds larger than 4000 rain-1. The three-dimensional turbulent flow in the entire pump flow passage and the laminar flow in the fluid dynamic bearing were then simulated numerically. The average pump performance was well predicted by the simulations. Both the tests and the simulations show that there is no obvious Reynolds effect for the miniature pump within the tested range of rotational speeds. The numerical results also show that the beating capacity of the fluid dynamic bearing increases with the pump rotor rotational speed and the eccentricity ratio of the journal to the bushing. This pump is very compact, so it is a prom- ising device for surgical use.

关键词： miniature pump fluid dynamic bearing hydraulic performance experiment numerical simulation

THE CULTURE HISTORY AND BREEDING STRATEGY OF POPLAR IN ITALY

在线全文

学校读者我要写书评

暂无评论

Journal of Northeast Forestry University 1992年第2期3卷 95-100页

作者： xu hongyuan Research Institute of Forestry ,Chinese Academy of Forestry 1. Research Institute of Forestry Chinese Academy of Forestry China

INTRODUCTION In Italy,they have done many bcnefi-cial works in the high yield plantation--the culture and the breeding of ***,in our country,introduced manygood clones such as I—214,I—72 and I—*** the clones were t... 详细信息

关键词： THE CULTURE HISTORY AND BREEDING STRATEGY OF POPLAR IN ITALY

Strengthen Political Mutual Trust,Deepen Comprehensive Cooperation and Enhance People-to-People Mutual Understanding:A Sidelight on the 16th Beijing-Tokyo Forumattended by Vice President Liu Hongcai

在线全文

学校读者我要写书评

暂无评论

International Understanding 2020年第3期 7-10页

作者： Li Chen 无 xu hongyuan 不详 Chinese Association for International Understanding

From November 30th to December 1st,the 16th Beijing-Tokyo Forumwas held via video for the first *** theme of the forum was“The Role of China and Japan in the International Order in Post-COVID Era”.

关键词： Tokyo Deep Beijing

Standing Together in Unity with Everlasting Friendship:Chinese NGOs Saw a Fruitful and Eventful 2020 in Cambodia

在线全文

学校读者我要写书评

暂无评论

International Understanding 2020年第3期 29-32页

作者： Zhang Jiahuan xu hongyuan 无不详 Cambodia Office of the China Foundation for Peace and Development

Cambodia,a country of“steel-clad brotherhood”by many Chinese people,has always attracted the attention of China.A 14-year-old Cambodian boy speaking 16 languages went on the list of most searched topics of Microblog.

关键词： has Together Unity

Conversation Builds the Bridge of Global Friendship:A Sidelight on the 1st China-Cambodia Friendship Chinese Speech Contest

在线全文

学校读者我要写书评

暂无评论

International Understanding 2020年第3期 25-28页

作者： Wang Lei xu hongyuan 无不详 China Foundation for Peace and Development

On November 27th,2020,Angkor Secondary School in Siem Reapwas filled with laughters and relaxed conversations when the 1st China-Cambodia Friendship Chinese Speech Contest was held.

关键词： filled relaxed Friendship

Friend in Need:Chinese NGOs Helped Myanmar Tackle COVID-19 with Anti-pandemic Donation

在线全文

学校读者我要写书评

暂无评论

International Understanding 2020年第3期 33-35页

作者： Wen Desheng xu hongyuan 无不详 China Foundation for Peace and Development in Myanmar

In recent years,more and more Chinese NGOs and International NGOs have been to Myanmar to carry out more diversified *** its founding,CFPD has always considered Myanmar as an important partner of exchange and cooperat... 详细信息

关键词： carry partner has

Development of Integrity Culture in Chinese Urban Community:Theoretical Logic and Practice Approach

在线全文

学校读者我要写书评

暂无评论

Development of Integrity Culture in Chinese Urban Community:...

KRAS mutation-induced EndMT of brain arteriovenous malformation is mediated through the TGF-β/BMP-SMAD4 pathway

第四届人文科学、管理和教育技术国际学术会议

作者： hongyuan xu Liansheng Yang School of Marxism Dalian University of Technology

Integrity is the baseline for behaviors,and it is also the basic condition for social *** the development of integrity is the practical need of *** integrity culture is the most important part of the development of *** the development of integrity culture has great theoretical and practical significance for promoting the integrity virtue and social *** development of integrity culture relies on the carrier of the urban community,which has the dual characteristics of morality and culture,exerts the value function of morality,and forms a positive interaction with community *** the process of the development of honest culture in urban communities,there are some practical problems,such as blind spots in macro mechanism guarantee,medium development content becoming formalistic,and classification of micro target groups not being precise,etc.,and the system needs to be optimized from the macro,medium and micro levels.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2023年第3期8卷 197-206,I0006-I0027页

作者： hongyuan xu Ran Huo Hao Li Yuming Jiao Jiancong Weng Jie Wang Zihan Yan Junze Zhang Shaozhi Zhao Qiheng He Yingfan Sun Shuo Wang Yong Cao Department of Neurosurgery Beijing Tiantan HospitalCapital medical universityBeijingChina China National Clinical Research Center for Neurological Diseases BeijingChina Beijing Neurosurgical Institute Capital Medical UniversityBeijingChina

Objective Somatic KRAS mutations have been identified in the majority of brain arteriovenous malformations(bAVMs),and subsequent in vivo experiments have confirmed that KRAS mutation in endothelial cells(ECs)causes AVMs in mouse and zebrafish *** previous study demonstrated that the KRASG12D mutant independently induced the endothelial-mesenchymal transition(EndMT),which was reversed by treatment with the lipid-lowering drug ***,the underlying mechanisms of action were *** We used human umbilical vein ECs(HUVECs)overexpressing the KRASG12D mutant for Western blotting,quantitative real-time PCR,and immunofluorescence and wound healing assays to evaluate the EndMT and determine the activation of downstream *** of SMAD4 by RNA interference was performed to explore the role of SMAD4 in regulating the *** ECs expressing the KRASG12D mutant were obtained to verify the SMAD4 ***,we performed a coimmunoprecipitation assay to probe the mechanism by which lovastatin affects *** HUVECs infected with KRASG12D adenovirus underwent the *** growth factor beta(TGF-β)and bone morphogenetic protein(BMP)signalling pathways were activated in the KRASG12D-mutant HUVECs and ECs in bAVM *** down SMAD4 expression in both KRASG12D-mutant HUVECs and ECs in bAVM tissues inhibited the *** attenuated the EndMT by downregulating p-SMAD2/3,p-SMAD1/5 and acetylated SMAD4 expression in KRASG12D-mutant *** Our findings suggest that the KRASG12D mutant induces the EndMT by activating the ERK-TGF-β/BMP-SMAD4 signalling pathway and that lovastatin inhibits the EndMT by suppressing TGF-β/BMP pathway activation and SMAD4 acetylation.

关键词： KRAS SMAD4 inhibited