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Construction of uniform CuO nanoshells and its application in high-voltage cathode materials

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Progress in Natural Science:materials International 2024年第4期34卷 747-752页

作者： Xian-Sen Tao Xianhong Li en-Wei Hou Zhongxuan ma Ke Yang Jianping ma Jingquan sha The Talent Culturing Plan for Leading Disciplines of shandong Province School of Chemistry Chemical Engineering and Materials Jining University Key Laboratory of Advanced Ceramics and machining Technology of ministry of Education Tianjin Key Laboratory of Composite and Functional Materials Tianjin University shandong Sacred Sun Power Sources Co. Ltd

CuO coating layers have attracted numerous attention due to its wide application in catalysis, batteries and other areas. However, the uncontrollable precipitation process of Cu2+has made it challenging to form uniform CuO nanoshells. In this study, uniform CuO nanoshells were prepared through a delicate design. Namely, the uniform Cu2+-poly（m-phenylenediamine）(Cu-PmPD) nanoshells were constructed firstly, and then the organic parts in the Cu-PmPD were removed while uniform CuO nanoshells formed in the controllable calcination *** this method to high-voltage cathode materials, the CuO was successfully coated on the LiNi0.5mn1.5O4,which greatly reduced the transition metal dissolution and improved the electrochemical performance in lithiumion batteries.

关键词： Nanoshells Copper oxide Lithium-ion batteries LiNi0·5mn1·5O4

Investigation of the inhomogeneous barrier height of an Au/Bi_4Ti_3O_(12)/n-Si structure through Gaussian distribution of barrier height

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Chinese Physics B 2012年第12期21卷 538-543页

作者： m.Gken m.Yildirim Department of Physics Faculty of Arts and SciencesDuzce University

A Au/Bi4Ti3O12/n-Si structure is fabricated in order to investigate its current voltage （IV） characteristics in a temperature range of 300 K-400 K. Obtained I-V data are evaluated by the thermionic emission （TE） theory. Zero-bias barrier height （Ф0） and ideality factor （n） calculated from I-V characteristics, are found to be temperature-dependent such that ФB0 increases with temperature increasing, whereas n decreases. The obtained temperature dependence of ФB0 and linearity in ФB0 versus the n plot, together with a lower barrier height and Richardson constant values obtained from the Richardson plot, indicate that the barrier height of the structure is inhomogeneous in nature. Therefore, I-V characteristics are explained on the basis of Caussian distribution of barrier height.

关键词： Bi4Ti3O12 I-V characterization temperature dependence Gaussian distribution

AGC1.5 Kinase Phosphorylates RopGEFs to Control Pollen Tube Growth

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molecular Plant 2018年第9期11卷 1198-1209页

作者： en Li Yong Cui Fu-Rong Ge Sen Chai Wei-Tong Zhang Qiang-Nan Feng Liwen Jiang sha Li Yan Zhang State Key Laboratory of Crop Biology College of Life Sciences Shandong Agricultural University Tai'an 271018 China School of Life Sciences Centre for Cell and Developmental Biology and State Key Laboratory of Agrobiotechnology The Chinese University of Hong Kong Shatin New Territories Hong Kong China

Double fertilization in angiosperms requires the targeted delivery of immotile sperm to the eggs through pollen tubes. The polarity of tip-growing pollen tubes is maintained through dynamic association of active Rho GTPases of plants （ROP-GTP） with the apical plasma membrane. Guanine nucleotide exchange factors for ROPs （RopGEFs） catalyze the activation of ROPs and thereby affect spatiotemporal ROP signaling. Whereas RopGEFs have been found to be phosphorylated proteins, the kinases responsible for their phos- phorylation in v/vo and biological consequences of RopGEF phosphorylation in pollen tube growth remain unclear. We report here that the Arabidopsis AGC1.5 subfamily of cytoplasmic kinases is critical for the restricted localization of ROP-GTP during pollen tube growth. Loss of AGCI.5 and AGC1.7 functions resulted in the mistargeting of active ROPs and defective events downstream of ROP signaling in pollen tubes. AGCI.5 interacts with RopGEFs via their catalytic PRONE domain and phosphorylates RopGEFs at a conserved Ser residue of PRONE domain. Loss of AGC1.5 and AGC1.7 functions resulted in the mistargeting of RopGEFs in pollen tubes, similar to the phenotype caused by the mutation that renders RopGEFs non-phosphorylatable by AGC1.5. Collectively, our results provide mechanistic insights into the spatiotem- poral activation of ROPs during the polar growth of pollen tubes.

关键词： tip growth phosphorylation AGC kinase polarity pollen tube

On the Proper Holomorphic mappings between Equidimensional Hartogs Domains over Hermitian Symmetric manifolds

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Acta mathematica Sinica,english Series 2024年第5期40卷 1215-1228页

作者： en Chao BI School of mathematics and Statistics Qingdao UniversityQingdao 266071P.R.China

In this paper,we study a family of Hartogs domains fibred over Hermitian symmetric manifolds being a unit ball in C^(m).The aim of the present study is to establish the rigidity results about proper holomorphic mappings between two equidimensional Hartogs domains over Hermitian symmetric *** particular,we can fully determine its biholomorphic equivalence and automorphism group.

关键词： Proper holomorphic mapping Hartogs domains Hermitian symmetric manifolds

On the Variation of a metric and Its Application

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Acta mathematica Sinica,english Series 2010年第10期26卷 2003-2014页

作者： Fa en WU Department of mathematics School of Science Beijing Jiaotong University Beijing 100044 P. R. China

Some of the variation formulas of a metric were derived in the literatures by using the local coordinates system, In this paper, We give the first and the second variation formulas of the Riemannian curvature tensor, Ricci curvature tensor and scalar curvature of a metric by using the moving frame method. We establish a relation between the variation of the volume of a metric and that of a submanifold. We find that the latter is a consequence of the former. Finally we give an application of these formulas to the variations of heat invariants. We prove that a conformally flat metric g is a critical point of the third heat invariant functional for a compact 4-dimensional manifold m, then （m, g） is either scalar flat or a space form.

关键词： Riemannian functional variation of a metric volume variation space form heat invariant

Effects of Heat Treatment and Thermal Cycling on martensitic Transformation Behavior of Ni_(59)Al_(11)mn_(30) High Temperature shape memory Alloy

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材料热处理学报 2004年第5期25卷 147-151页

作者： HeZhi-rong ZhouJing-en shaanxiUniversityofTechnology Hanzhong723003China Xi＇anJiaotongUniversity Xi＇an710049China

A reversible martensitic transformation (mT) takes place during cooling and heating in the solution quenched and the solution quenched plus aged Ni59AlHmn30 alloy The mT temperature increases with increasing solution temperature. The excellent mT characteristics can be obtained from a process of lOOCTC solution quenched plus 400 °C aged. Follow this process, the mT start temperature (ms) and the reverse mT finish temperature (Af) are 469*C and 548"C, respectively. The martensitic stabilization effect in the solution quenched and aged Ni59Alnmn3o alloy is observed as an increase in the Af temperature of the first reverse mT during thermal cycles. This stabilization effect vanishes from the second thermal cycle. Thermal cycling can enhance the stability of the reversible mT. The microstructure of the quenched NisgAlnmnjo alloy consists of martensite (m) and gamma phase. The volume fraction of gamma phase is about 40%. The substructure of m and gamma phase is twins and dislocations, respectively. The hardness of m is higher than that of gamma phase. After aging treatment the basic phases of alloy do not change, but the hardness of the phases increases.

关键词：热处理马氏体转变形状记忆合金热循环 Ni59Al11mn30

Firm-level Strategic Competition and Peer Effects in Corporate Investment among Chinese Firms

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Journal of Systems Science and Systems engineering 2022年第6期31卷 753-774页

作者： Jianing Li Yu-en Lin School of Business Administration Northeastern UniversityShenyangLiaoning110000China Center for Quantitative Economics Jilin UniversityChangchunjilin130015China

This study investigates the influence of strategic competition on peer effects in corporate investment by using a sample of 28,522 observations of Chinese listed companies from 2008 to *** study develops a linear-in means model and uses an instrumental variables approach,and uses the competitive strategy measure(CSm)and Lerner index as proxies of competitive strategies and competitive positions to capture the firm-level *** empirical results demonstrate that when firms compete as strategic substitutes and when firms are in higher competitive positions,the peer effects in corporate investment are significant and *** addition,in circumstances of high information asymmetry,firms competing as strategic substitutes and firms in high competitive positions rely more on information related to investment from peer ***,industry policies and barriers do not significantly influence peer effects in *** study offers new empirical evidence regarding peer effects in corporate investment in China.

关键词： Corporate investment peer effects competitive strategy competitive position

modeling and Predicting of News Popularity in Social media Sources

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Computers, materials & Continua 2019年第7期61卷 69-80页

作者： Kemal Akyol BahaŞen Faculty of engineering and Architecture Kastamonu University37100KastamonuTurkey Faculty of engineering Yıldırım Beyazıt University06500AnkaraTurkey

The popularity of news,which conveys newsworthy events which occur during day to people,is substantially important for the spectator or *** interact with news website and share news links or their *** study uses supervised learning based machine learning techniques in order to predict news popularity in social media *** techniques consist of basically two phrases:a)the training data is sent as input to the classifier algorithm,b)the performance of prelearned algorithm is tested on the testing *** so,a knowledge discovery from the data is *** this context,firstly,twelve datasets from a set of data are obtained within the frame of four categories:Economic,microsoft,Obama and ***,news popularity prediction in social network services is carried out by utilizing Gradient Boosted Trees,multi-Layer Perceptron and Random Forest learning *** prediction performances of all algorithms are examined by considering mean Absolute Error,Root mean Squared Error and the R-squared evaluation *** results show that most of the models designed by using these algorithms are proved to be applicable for this ***,a comprehensive study for the news prediction is presented,using different techniques,drawing conclusions about the performances of algorithms in this study.

关键词： News popularity sentiment scores social network services Gradient Boosted machines multi-Layer Perceptron Random Forest

Application of an ice-ocean coupled model to Bohai Sea ice simulation

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Journal of Oceanology and Limnology 2021年第1期39卷 1-13页

作者： Bin JIA Xue’en CHen College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China

The HAmSOm(Hamburg Shelf Ocean model),a high-resolution regional ice-ocean coupled model,was applied to investigate the seasonal evolution of Bohai Sea ice for winter 2015/*** was initialized with monthly climatological temperature and salinity data from WOA13 and driven by hourly meteorological data obtained from the NCEP above the sea surface and tides at the open *** ice model used here is a modifi ed Hibler-type dynamic-thermodynamic sea ice model based upon viscous-plastic *** ice extent,concentration,area,thickness,length of ice season as well as the distance between the top of Liaodong Bay(North China)and the outer ice edge line were simulated and compared with the observed *** types of modeling experiments were carried out to investigate the eff ects of wind,tide,and both wind and tide on Bohai Sea *** results show that wind,as both a dynamic and a thermodynamic factor,has a signifi cant impact on the ice thickness,ice area,and ice-freezing and ice breakup dates as well as the ice velocity,while tides are a dynamic factor that infl uences only the ice *** the severe ice period,the wind speed intensity increased by 25%,the average ice thickness thickened by approximately 4.0 cm in Liaodong Bay,approximately 2.1 cm in Bohai Bay and approximately 2.5 cm in Laizhou Bay,and the total ice coverage area and total ice actual area increased by about 2×104 km 2 and 1.4×104 km 2,*** the tidal amplitude intensity increased by 25%,the average ice velocity increased by approximately 0.1 m/s.

关键词： Bohai Sea ice ice-ocean coupled model eff ects of wind and tides