检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

BCC点阵结构优化及防撞应用

机械科学与技术 2024年第6期43卷 1078-1083页

作者：邹云钊何易周尹硕辉湘潭大学机械工程学院湖南湘潭411105

为研究优化后的BCC点阵结构在海上风力发电机单桩基础碰撞中的应用,设计了一种防撞装置模型。基于Workbench分析平台,对BCC点阵结构的单胞尺寸进行多目标优化,并将优化前后的仿真结果进行对比,验证了优化尺寸的可靠性;利用渐进均匀化理... 详细信息

为研究优化后的BCC点阵结构在海上风力发电机单桩基础碰撞中的应用,设计了一种防撞装置模型。基于Workbench分析平台,对BCC点阵结构的单胞尺寸进行多目标优化,并将优化前后的仿真结果进行对比,验证了优化尺寸的可靠性;利用渐进均匀化理论,建立BCC点阵结构等效模型,对比分析海上风力发电机单桩基础防撞装置模型在碰撞中的仿真性能。研究表明,该防撞装置不仅具有缓冲性,还能有效减少单桩基础遭遇碰撞后的损伤程度。

关键词： BCC点阵结构多目标优化等效模型单桩基础防撞装置数值仿真

Functional conservation and divergence of miR156 and miR529 during rice development

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2023年第3期11卷 692-703页

作者： Yan Li yizhou he Tian Qin Xuelian Guo Kun Xu Chunxue Xu Wenya Yuan State Key Laboratory of Biocatalysis and Enzyme Engineering Hubei Collaborative Innovation Center for Green Transformation of Bio-ResourcesSchool of Life SciencesHubei UniversityWuhan 430062HubeiChina Oil Crops Research Institute of Chinese Academy of Agricultural Sciences Wuhan 430062HubeiChina Wuhan City Vocational College Wuhan 430064HubeiChina

MicroRNAs(miRNAs)are important regulatory elements involved in the regulation of various plant developmental and physiological processes by blocking the expression of target ***156 and miR529 are two combinatorial regulators,which cooperatively target the SQUAMOSA PROMOTER BINDING-LIKE(SPL)family ***,there has been no report about the functional conservation and divergence of miR156 and miR529 during plant development to *** this study,the biological function and relationship of miR156,miR529 and their target Os SPL14 in rice were *** of miR156e or miR529a(miR156e-OE and miR529a-OE)increased the grain size and tiller number but decreased the plant height and panicle length,while an opposite phenotype was observed for their target mimicry(miR156-MIMIC and miR529a-MIMIC)transgenic ***-loop RT-PCR results revealed ubiquitous expression of miR156 in roots,axillary buds and leaves,while miR529 was preferentially expressed in the ***,Os SPL14 could be preferentially and precisely cleaved by miR529a in young panicle but by miR156 in vegetative *** plants generated by the target immune strategy exhibited obvious growth defects upon the blocking of miR156 and/or miR529 function in rice,confirming that both miR156 and miR529 play important roles in controlling rice growth and ***,the miR156/miR529-Os SPL14 module negatively controlled grain size by regulating the genes associated with grain size and cell cycling,and controlled plant height through a more complicated *** together,our results demonstrate that miR156 and miR529 respectively function dominantly in the vegetative stage and reproductive stage to control rice growth and development by regulating the accumulation of Os *** findings facilitate a better understanding of the functional conservation and divergence of miR156 and miR529 family in the miRNA combinatorial regulatory network of plants.

关键词： MiRNA OsSPL14 Tiller number Grain size Oryza sativa

Flat Zn deposition at battery anode via an ultrathin robust interlayer

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 8104-8111页

作者： yizhou Wang Jianyu Chen Zibo Chen Qian he Zhengnan Tian Jin Zhao Yanwen Ma Husam N.Alshareef Materials Science and Engineering King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia State Key Laboratory of Organic Electronics and Information Displays(KLOEID)and Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts and TelecommunicationsNanjing 210023China Suzhou Vocational Institute of Industrial Technology Suzhou 215104China

Rechargeable aqueous zinc(Zn)ion batteries(AZIBs)using low-cost and safe Zn metal anodes are considered promising candidates for future grid-scale energy storage systems,but the Zn dendrite problem severely hinders the further prospects of *** Zn depositing behaviors toward horizontal alignment is highly effective and thus has received huge ***,such a strategy is usually based on previous substrate engineering,which requires complex preparation or expensive ***,it is essential to develop a novel solution that can realize horizontally aligned Zn flake deposition via easy operation and low ***,we report an ultrathin and robust Kevlar membrane as the interlayer to mechanically suppress Zn dendrite *** to the randomly distributed flaky dendrites in the control group,the deposited Zn sheets would grow into parallel alignment with the existence of such *** the dendrites are effectively suppressed,Zn||Cu asymmetric,Zn||Zn symmetric,and Zn||MnO_(2)full batteries using Kevlar interlayer deliver significantly improved cycling ***,the Zn||MnO_(2)pouch cell using a Kevlar interlayer delivers stable cycling performance and shows stable operation during multi-angle *** believe this work provides a new possibility for regulating Zn deposition from a crystallographic perspective.

关键词： Zn metal anodes Zn dendrites aqueous Zn ion batteries dendrite suppression (002)crystal plane

Random access preamble design based on time pre-compensation for LTE-satellite system

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

The Journal of China Universities of Posts and Telecommunications 2015年第3期22卷 64-73页

作者： he yizhou Cui Gaofeng Li Pengxu Chang Ruijun Wang Weidong Beijing University of Posts and Telecommunications Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory

Because of the integration of long term evolution （LTE） technology and mobile satellite communication systems, uplink access technology for LTE-based geo-stationary earth orbit （GEO） satellite has become a popular research topic for satellite system. In order to solve the problem of unreasonable design for physical random access channel （PRACH） signal structure and reduce the effect of time uncertainty, this paper proposes a novel random access preamble based on time pre-compensation （TPC） for LTE-Satellite （LTE-S） system. In this scheme, by applying the method of non-linear least squares, the user terminal （UT） can use and based on the transmission delay the receiving power to estimate the communication round trip delay （RTD） of the beam center and the satellite, RTD can be compensated before transmission. Therefore, the preamble length and duration can be reduced without related to the maximum of RTD. In order to verify the performance of the scheme, the MATLAB is used to build a test system. The simulation results show that the proposed preamble satisfies the requirements of LTE-S system, and the better performance than previous researches is obtained.

关键词： mobile satellite communication long term evolution (LTE)-Satellite random access pre-compensation

Timing Advanced Estimation Algorithm of Low Complexity Based on DFT Spectrum Analysis for Satellite System

在线全文

学校读者我要写书评

暂无评论

China Communications 2015年第4期12卷 140-150页

作者： he yizhou CUI Gaofeng LI Pengxu CHANG Ruijun WANG Weidong Key Laboratory of Universal Wireless Communications Ministry of EducationBeijingChinaSchool of electronic engineeringBeijing University of Posts and Telecommunications

In satellite mobile communication system, relative movement of the satellite and the terminal will cause a large Doppler offset. Timing advanced estimation with Zadoff-Chu sequence is sensitive to the frequency offset. When the frequency offset is larger than one times subcarrier spacing, the value of peak cannot be detected at the receiving end. To suppress the larger Doppler frequency shift, this paper proposes a novel timing advanced estimation scheme(TAE-MCD) for satellite communication system. In this algorithm, t r a n s m i t t e d s i g n a l i s d i v i d e d i n t o Z C sequence and its conjugate sequence. Using multiplication and DFT operation to find the estimated peak at the receiving end, and make subtraction with the obtained sequences at last. The scheme can not only inhibit the adverse effects of large Doppler frequency shift in timing estimation effectively, but also reduce the computational complexity at the receiving end and improve the work efficiency of the hardware. Simulations results show that TAEMCD outperform the existing timing advanced estimation methods, on the condition of no additional time and frequency resource are needed.

关键词：估计算法定时估计卫星系统 DFT 频谱分析低复杂度卫星移动通信系统多普勒频移

Cobalt-catalyzed reductive alkynylation to construct C(sp)-C(sp^(3))and C(sp)-C(sp^(2))bonds

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第7期35卷 253-258页

作者： Lei Wan yizhou Tong Xi Lu Yao Fu hefei National Research Center for Physical Sciences at the Microscale iChEMCAS Key Laboratory of Urban Pollutant ConversionAnhui Province Key Laboratory of Biomass Clean EnergyUniversity of Science and Technology of ChinaHefei 230026China Key Laboratory of Precision and Intelligent Chemistry School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China

Transition-metal-catalyzed cross-electrophile coupling has emerged as a reliable method for constructing carbon–carbon ***,we report a general method,cobalt-catalyzed reductive alkynylation,to construct C(sp)-C(sp^(3))and C(sp)-C(sp^(2))*** presented reaction has a broad substrate scope,enabling the efficient cross-electrophile coupling between alkynyl bromides with alkyl halides and aryl or alkenyl(pseudo)*** presented reaction is conducted under mild conditions,tolerating many functional groups,thus suitable for the modification and synthesis of biologically active molecules.

关键词： Cobalt-catalysis Cross-electrophile coupling Carbon-carbon bond formation Reductive alkynylation Alkyne synthesis

基于共词分析的我国住院病案首页研究热点探析

在线全文

学校读者我要写书评

暂无评论

中国病案 2024年第6期25卷 61-64页

作者：牟海燕罗建李国静邓川燕全华艳周艾婧黄露何易洲莫春梅四川大学华西医院病案科四川省成都市610041

目的探析我国近10年住院病案首页领域研究热点,为相关研究提供参考。方法在中国知网中检索2013年7月1日-2023年6月30日住院病案首页相关文献,将筛选出文献导入BICOMB中统计发表时间、期刊和第一作者分布。基于共词分析法使用SPSS 20.... 详细信息

目的探析我国近10年住院病案首页领域研究热点,为相关研究提供参考。方法在中国知网中检索2013年7月1日-2023年6月30日住院病案首页相关文献,将筛选出文献导入BICOMB中统计发表时间、期刊和第一作者分布。基于共词分析法使用SPSS 20.0对经预处理之后的前48个高频关键词形成的相异矩阵进行聚类分析,得到病案首页研究热点。结果共检索得到有效文献1317篇。近10年我国住院病案首页相关文献整体呈上升趋势,载文最多的期刊为《中国病案》,刊载了该领域28%的文献,发文最多的第一作者为首都医科大学宣武医院的黄昊。词频前10位的关键词包括DRGs、质量控制、缺陷、质量、对策等,研究热点包括:住院病案首页与公立医院绩效考核的关系、住院病案首页质量现状研究、疾病ICD编码探讨、住院病案首页数据分析与利用、DRG在医疗服务中的应用、运用PDCA等方法提升住院病案首页质量等6个领域。结论住院病案首页在我国关注度较高,论文量、载文期刊和作者数量众多。研究热点广泛、探讨内容丰富,不仅局限于住院病案首页质量、ICD编码等住院病案首页直接相关主题,而且还扩大到了绩效考核、DRGs等领域。

关键词：住院病案首页共词分析研究热点

Distributed Robust Optimal Dispatch of Regional Integrated Energy Systems Based on ADMM Algorithm with Adaptive Step Size

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 852-862页

作者： Zhoujun Ma yizhou Zhou Yuping Zheng Li Yang Zhinong Wei the College of Energy and Electrical Engineering Hohai UniversityNanjing 211100China State Grid Jiangsu Electric Power Co. Ltd.Nanjing 210019China State Key Laboratory ofSmart Grid Protection and Control NARI Group CorporationNanjing 211106China

This paper proposes a distributed robust optimal dispatch model to enhance information security and interaction among the operators in the regional integrated energy system(RIES).Our model regards the distribution network and each energy hub(EH)as independent operators and employs robust optimization to improve operational security caused by wind and photovoltaic(PV)power output uncertainties,with only deterministic information exchanged across *** paper also adopts the alternating direction method of multipliers(ADMM)algorithm to facilitate secure information interaction among multiple RIES operators,maximizing the benefit for each ***,the traditional ADMM algorithm with fixed step size is modified to be adaptive,addressing issues of redundant interactions caused by suboptimal initial step size settings.A case study validates the effectiveness of the proposed model,demonstrating the superiority of the ADMM algorithm with adaptive step size and the economic benefits of the distributed robust optimal dispatch model over the distributed stochastic optimal dispatch model.

关键词： Regional integrated energy system(RIES) distributed optimization robust optimization operation security energy hub(EH)

From atomistic modeling to materials design:computation-driven material development in lithium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第1期67卷 276-290页

作者： Xiangrong Li Xiang Chen Qiang Bai Yifei Mo yizhou Zhu Research Center for Industries of the Future and School of Engineering Westlake UniversityHangzhou 310030China Department of Chemical Engineering Tsinghua UniversityBeijing 100084China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Department of Materials Science and Engineering University of MarylandCollege Park 20742United States

As an advanced energy storage system,lithium-ion batteries play an essential role in modern *** their ubiquitous success,there is a great demand for continuous improvements of the battery performance,including higher energy density,lower safety risk,longer cycling life,and lower *** performance improvement requires the design and development of novel electrode and electrolyte materials that exhibit desirable properties and satisfy strict *** modeling can provide a unique perspective to fundamentally understand and rationally design battery *** this paper,we review a few recent successful examples of computation-driven discovery and design in electrode and electrolyte ***,we highlight how atomistic modeling can reveal the underlying mechanisms,predict the important properties,and guide the design and engineering of electrode and electrolyte *** have a conclusion with a discussion of the unique capability of atomistic modeling in battery material development and provide a perspective on future challenges and directions for computation-driven battery material developments.

关键词： materials design computation modeling batteries electrolyte electrode