检索结果-南通市图书馆

The trajectory of rice from wild to domesticated:A new chapter in the study of origins of agriculture

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第9期67卷 3011-3012页

作者： Zhijun zhao Institute of Cultural Heritage Shandong UniversityQingdao 266237China

Rice(Oryza sativa)is one of the most important food crops in the world today,feeding more than one-third of the global *** domestication of rice has always been an international research topic(Gross and zhao,2014).When,where,and how rice was cultivated and eventually domesticated has been a hot issue in many research fields such as archaeology,biology,and agronomy(Fuller et al.,2009).

关键词： sativa Oryza crops

A DIRECT DISCONTINUOUS GALERKIN METHOD FOR TIME FRACTIONAL DIFFUSION EQUATIONS WITH FRACTIONAL DYNAMIC BOUNDARY CONDITIONS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2024年第1期42卷 156-177页

作者： Jingjun zhao Wenjiao zhao Yang Xu School of Mathematics Harbin Institute of TechnologyHarbin 150001China

This paper deals with the numerical approximation for the time fractional diffusion problem with fractional dynamic boundary *** well-posedness for the weak solutions is studied.A direct discontinuous Galerkin approach is used in spatial direction under the uniform meshes,together with a second-order Alikhanov scheme is utilized in temporal direction on the graded mesh,and then the fully discrete scheme is ***,the stability and the error estimate for the full scheme are analyzed in *** experiments are also given to illustrate the effectiveness of the proposed method.

关键词： Time fractional diffusion equation Numerical stability Convergence

A water-stable high-voltage P3-type cathode for sodium-ion batteries

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

Chinese Chemical Letters 2024年第9期35卷 507-513页

作者： Shengyu zhao Xuan Yu Yufeng zhao Institute for Sustainable Energy&College of Sciences Shanghai UniversityShanghai 200444China

The Na-deficient P3-type layered oxide cathode material usually experience complex in-plane Na^(+)/vacancy ordering rearrangement and undesirable P3-O3 phase transitions in the high-voltage region,leading to inferior cycling ***,they exhibit unsatisfactory stability when exposed to water for extended *** address these challenges,we propose a Cu/Ti co-doped P3-type cathode material(Na_(0.67)Ni_(0.3)Cu_(0.03)Mn_(0.6)Ti_(0.07)O_(2)),which effectively mitigates Na^(+)/vacancy ordering and suppresses P3-O3 phase transitions at high *** a result,the as-prepared sample exhibited outstanding cyclic performance,with 81.9%retention after 500 cycles within 2.5–4.15 V,and 75.7%retention after300 cycles within 2.5–4.25 ***,it demonstrates enhanced Na^(+)transport kinetics during desodiation/sodiation and reduced growth of charge transfer impedance(R_(ct))after various ***,the sample showed superb stability against water,exhibiting no discernible degradation in structure,morphology,or electrochemical *** co-doping strategy provides new insights for innovative and prospective cathode materials.

关键词： Sodium ion batteries P3-type materials Phase transition Na^(+)/vacancy ordering Water-stable cathode

民族地区高校学生情绪管理能力影响因素调查及研究

在线全文

学校读者我要写书评

暂无评论

包头医学院学报 2019年第5期35卷 87-89页

作者：赵昆赵石磊内蒙古科技大学包头医学院

目的:通过对大学生情绪管理能力影响因素的调查,充分了解大学生心理状态和需求,为改进学生管理方式及方法提供依据。方法:运用文献分析、分层整群抽样的方法,通过调查问卷等方式从包头市3所高校大学生的理智调控能力等5个维度出发,了解... 详细信息

目的:通过对大学生情绪管理能力影响因素的调查,充分了解大学生心理状态和需求,为改进学生管理方式及方法提供依据。方法:运用文献分析、分层整群抽样的方法,通过调查问卷等方式从包头市3所高校大学生的理智调控能力等5个维度出发,了解包头地区大学生情绪管理能力的现状。结果:通过数据分析发现,包头地区大学生的情绪管理能力因民族、左右利手、兴趣爱好、体育锻炼状况等几个方面的不同而存在差异。结论:依据对包头地区大学生情绪管理能力有关影响因素的调查,从学校、教师、学生个人等角度提出了培养大学生的情绪管理能力的一些可行措施和办法。

关键词：民族地区高校学生情绪管理能力调查研究

Resilient control of flexible hypersonic vehicles against unmatched distributed faults

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第5期37卷 60-70页

作者： Dong zhao Wenjing REN School of Artificial Intelligence Anhui UniversityHefei 230601China Key Laboratory of System Control and Information Processing Ministry of EducationShanghai Jiao Tong UniversityShanghai 200240China School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China

This paper studies a robust fault compensation and vibration suppression problem of flexible hypersonic *** controlled plant is represented by a cascade system composed of a nonlinear Ordinary Differential Equation(ODE)and an Euler-Bernoulli Beam Equation(EBBE),in which the vibration dynamics is coupled with the rigid dynamics and suffers from distributed faults.A state differential transformation is introduced to transfer distributed faults to an EBBE boundary and a longitudinal dynamics is refined by utilizing T-S fuzzy IF-THEN rules.A novel T-S fuzzy based fault-tolerant control algorithm is developed and related stability conditions are *** robust exponential stability and well-posedness are proved by using the modified l_(0)-semigroup based Lyapunov direct approach.A simulation study on the longitudinal dynamics of flexible hypersonic vehicles effectively verifies the validity of the developed theoretical results.

关键词： Flexible hypersonic vehicles ODE-EBBE cascade Robust exponential stability Unmatched distributed fault compensation Vibration suppression

在线全文

学校读者我要写书评

暂无评论

包头地区高校学生情绪管理能力调查研究

包头医学院学报 2019年第8期35卷 88-89,108页

作者：赵昆赵石磊内蒙古科技大学包头医学院

目的:通过开展大学生情绪管理能力调查和研究,了解大学生心理状态和需求,了解当代大学生情绪及情绪管理能力的现状。方法:采用调查问卷的方式从包头市三所高校在校学生的理智调控能力等5个维度出发,了解包头地区高校学生情绪管理能力的... 详细信息

目的:通过开展大学生情绪管理能力调查和研究,了解大学生心理状态和需求,了解当代大学生情绪及情绪管理能力的现状。方法:采用调查问卷的方式从包头市三所高校在校学生的理智调控能力等5个维度出发,了解包头地区高校学生情绪管理能力的现状。结果:包头地区高校学生的情绪管理能力因不同性别、不同学校、不同专业等几个方面存在差异。结论:大学生心理较不成熟,自我情绪调控和自我行为约束能力较弱,且受多种因素影响。学校和老师应通过多种途径积极引导,帮助他们提高情绪管理能力。

关键词：包头市高校学生情绪管理能力调查研究

H-and J-aggregation of conjugated small molecules in organic solar cells

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第6期93卷 174-192,I0005页

作者： Qiaoqiao zhao Feng He State Key Laboratory of Biobased Material and Green Papermaking Qilu University of TechnologyShandong Academy of SciencesJinan 250353ShangdongChina Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and TechnologyShenzhen 518055GuangdongChina Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and TechnologyShenzhen 518055GuangdongChina

As H-and J-aggregation receive more and more attention in the research of organic solar cells(OSCs),especially in small molecular systems,deep understanding of aggregation behavior is needed to guide the design of conjugated small molecular structure and the fabrication process of OSC *** this end,this review is ***,the review firstly introduced the basic information about H-and J-aggregation of conjugated small molecules in ***,the characteristics of H-and J-aggregation and the methods to identify them were ***,it reviewed the research progress of H-and J-aggregation of conjugated small molecules in OSCs,including the factors influencing H-and J-aggregation in thin film and the effects of H-and J-aggregation on OPV performance.

关键词： H-aggregation J-aggregation Organic solar cells Small molecules Efficiency Stability

A novel Bayesian-based INS/GNSS integrated positioning method with both adaptability and robustness in urban environments

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第6期37卷 205-218页

作者： Zhe YANG Hongbo zhao School of Electronics and Information Engineering Beihang UniversityBeijing 100191China

Achieving higher accuracy positioning results in urban environments at a lower cost has been an important pursuit in areas such as autonomous driving and intelligent *** Inertial Navigation System and Global Navigation Satellite System(INS/GNSS)integrated navigation systems have been an important means of fulfilling the above quest due to the complementary error characteristics between INS and *** complex urban driving environment requires the system sufficiently adaptive to keep up with the time-varying measurement noise and sufficiently robust to cope with measurement outliers and prior ***,many efforts lack a balance between adaptability and *** this paper,a novel positioning method with both adaptability and robustness is proposed by coupling the Mahalanobis distance method,the Variational Bayesian method and the student’s t-distribution in one process(M-VBt method).This method is robust against non-Gaussian noise and priori uncertainties,plus adaptive against measurement noise uncertainty and time-varying *** field test results show that the M-VBt method(especially the Mahalanobis distance part)has significantly improved the system performance in the complex urban driving environment.

关键词： Urban environments Mahalanobis distance Adaptability Robustness Integrated navigation

pyIFPNI:A package for querying and downloading plant fossil data from the IFPNI

在线全文

学校读者我要写书评

暂无评论

Plant Diversity 2024年第2期46卷 280-282页

作者： Bailong zhao State Key Laboratory of Plant Diversity and Specialty Crops Institute of BotanyChinese Academy of SciencesBeijing100093China University of Chinese Academy of Sciences Beijing100049China

The International Fossil Plant Names Index(IFPNI,2014-onwards)not only serves as an online gateway to the fossil plant name registry for the global scientific community,but also serves as a comprehensive and dynamic archive of fossil plants(Doweld,2016,2022).Since its establishment in 2014,the IFPNI has accumulated more than 80,000 entries of fossil plant names,along with information on over 10,000 documents and over 6000 paleobotanists,all supported by exhaustive data,demonstrating the scope of the IFPNI's work(IFPNI,2014-onwards).

关键词： plant fossil