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Magnetic Coupling Induced Self-Assembly at Atomic Level

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Chinese Physics Letters 2019年第11期36卷 48-51页

作者： Weiyu Xie Yu Zhu Jianpeng wang Aihua Cheng zhigang wang Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012

Developing accurate self-assembly is the key for constructing functional materials from a bottom-up *** present, it is mainly hindered by building blocks and driving modes. We design a new self-assembly method based on the magnetic coupling between spin-polarized electrons. First-principles calculations show that spinpolarized electrons from different endohedral metallofullerene(EMF) superatoms can pair each other to ensure a one-dimensional extending morphology. Furthermore, without ligand passivation, the EMF superatoms maintain their electronic structures robustly in self-assembly owing to the core-shell structure and the atomic-like electron arrangement rule. Therefore, it should noted that the magnetic coupling of monomeric electron spin polarization can be an important driving mechanism for high-precision self-assembly. These results represent a new paradigm for self-assembly and offer fresh opportunities for functional material construction at the atomic level.

关键词： driving coupling Coupling

Properties and Characteristics of Certain Subclass of Close-to-Convex Harmonic Mappings

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Journal of Mathematical Research with Applications 2024年第5期44卷 648-658页

作者： Jiong SHI zhigang wang Xiaoyuan wang School of Mathematics and Statistics Changsha University of Science and Technology School of Mathematics and Statistics Hunan First Normal University School of Mathematics and Statistics Nanjing University of Science and Technology Graduate School of Information Sciences Tohoku University

In this paper, we study a subclass of close-to-convex harmonic mappings whose analytic parts are starlike mappings. We derive some properties and characteristics for this class, such as the bounds of Toeplitz determin... 详细信息

关键词： univalent harmonic mapping close-to-convex harmonic mapping Bohr radius Toeplitz determinant Hankel determinant

Brassinosteroids Mediate Endogenous Phytohormone Metabolism to Alleviate High Temperature Injury at Panicle Initiation Stage in Rice

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Rice science 2023年第1期30卷 70-86页

作者： CHEN Yanhua wang Yaliang CHEN Huizhe XIANG Jing ZHANG Yikai wang zhigang ZHU Defeng ZHANG Yuping National Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 310006China

High temperatures cause physiological and biochemical changes and significantly affect young panicle development of rice(Oryza sativa L.).Brassinosteroids play important roles in enhancing crop stress *** this study,we subjected rice cultivars Huanghuazhan(heat-resistant)and IR36(heat-sensitive)to high temperature(HT,40 oC)or normal temperature(NT,33 oC)for 7 d at the panicle initiation stage,in conjunction with application of 24-epibrassinolide[EBR,a synthetic brassinolide(BR)]or brassinazole(BRZ,a BR biosynthesis inhibitor)at the beginning of the *** exacerbated spikelet degeneration and inhibited young panicle growth,which were partially prevented by EBR application,while BRZ application aggravated the reduction in spikelet *** decreased the contents of BR,active cytokinins(aCTK),active gibberellins(aGA)and indole-3-acetic acid(IAA),but increased the content of abscisic acid(ABA)in young *** activities of key enzymes involved in sucrose hydrolysis,glycolysis and the tricarboxylic acid cycle in young panicles were decreased with the change of endogenous hormone levels under *** addition,the contents of H2O2 and malondialdehyde(MDA)were increased and the activities of antioxidant enzymes were decreased in young *** application of EBR induced the expression of phytohormone biosynthesis-related genes and down-regulated the expression of phytohormone catabolism-related genes to increase the contents of endogenous BR,aCTK,aGA and ABA,thus promoting the decomposition and utilization of sucrose in young panicles,enhancing the activities of superoxide dismutase,catalase and peroxidase,and reducing the accumulation of H2O2 and MDA in young panicles,whereas application of BRZ had the opposite physiological *** results showed that brassinosteroids mediate endogenous phytohormone metabolism to alleviate HT injury at the panicle initiation stage in rice.

关键词： rice high temperature panicle initiation stage phytohormone metabolism physiological and biochemical indices

A local geopotential model for implementation of underwater passive navigation

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Progress in Natural Science:Materials International 2008年第9期18卷 1139-1145页

作者： zhigang wang , Shaofeng Bian Department of Navigation, Naval University of Engineering, Wuhan 430033, China Department of Navigation Naval University of Engineering Wuhan 430033 China

A main aspect of underwater passive navigation is how to identify the vehicle location on an existing gravity map, and several match-ing algorithms as ICCP and SITAN are the most prevalent methods that many scholars are *** this paper, a novel algorithm that is difierent from matching algorithms for passive navigation is *** algorithm implements underwater passive navigation by directly estimating the inertial errors through Kalman filter algorithm, and the key part of this implementation is a Fourier series-based local geopotential ***, the principle of local geopotential model based on Fourier series is introduced in this paper, thus the discrete gravity anomalies data can be expressed analytically with respect to geographic coordinates to establish the observation equation required in the application of Kalman ***, the indicated gravity anomalies can be gotten by substituting the inertial posi-tions to existing gravity anomalies ***, the classical extended Kalman filter is introduced with the difierences between measured gravity and indicated gravity used as observations to optimally estimate the errors of the inertial navigation system (INS).This naviga-tion algorithm is tested on simulated data with encouraging *** this algorithm is developed for underwater navigation using gravity data, it is equally applicable to other domains, for example vehicle navigation on magnetic or terrain data.

关键词： Passive navigation Fourier series Local geopotential model Extended Kalman filter Inertial navigation system

PbGIF1 promoting cell-proliferation in pear fruit is transcriptionally activated by Pb RR1

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Horticultural Plant Journal 2024年第3期10卷 689-697页

作者： Huibin wang Guangya Sha Rui Gao Jianwen Pang Rui Zhai Chengquan Yang zhigang wang Lingfei Xu College of Horticulture Northwest A&F UniversityYanglingShaanxi 712100China College of Life Science Hebei Agricultural UniversityBaodingHebei 071000China

As a cell proliferation regulator involved in wide biological processes in plants,GRF-INTERACTING FACTOR(GIF)controls different tissues ***,whether GIF participates in fruit development remains *** to transcriptome data,we identified PbGIF1was highly expressed during fruit development in cytokinins induced parthenocarpy *** the present study,the biofunction of PbGIF1 was initially *** of PbGIF1 promoted fruit size of transgenic *** size of flesh fruit was not affected by cell expansion but the cell proliferation was promoted by overexpressing Pb *** accelerated cell proliferation process was also observed in PbGIF1-overexpressed transgenic pear fruit *** transcriptional regulation of cytokinins on PbGIF1 was further confirmed by exogenous CPPU treatments in pear *** investigate the underlying mechanism,the cytokinins-responded factor,PbRR1,was further focused *** results of Yeast-one-hybrid assay suggested that PbRR1 can bind to the promoter sequence of *** transcriptional activation of PbRR1 on PbGIF1 was also confirmed by Dual-Luciferase *** together,the results showed that cytokinins control pear fruit development via the transcriptional activation of PbGIF1 by PbRR1.

关键词： PbGIF1 Cell proliferation Pear Fruit development Cytokinins PbRR1

Photochemical alteration of biogenic particles in wastewater effluents

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Chinese Science Bulletin 2014年第28期59卷 3659-3668页

作者： Xiaofang Yang Zengquan Li Fangang Meng zhigang wang Li Sun SYSU-HKUST Research Center for Innovative Environmental Technology (SHRCIET) School of Environmental Science and Engineering Sun Yat-sen University Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Department of Atmospheric Science School of Environmental Science and Engineering Sun Yat-sen University

Biogenic particles discharged by wastewater treatment plants play important roles in receiving water because of the large specific surface area and good mobility of the particles. In this study, the changes induced in biogenic particles by natural sunlight were investigated to understand the phototransformation of the particles in the receiving waters. The results showed that photoexposure resulted in significant decreases in the sizes of the biogenic particles but that photoexposure did not impact the zeta potentials. In addition, the photodissolution of biogenic particulate organic matter(POM) led to the generation of biogenic dissolved organic matter(DOM). Characterization using excitation–emission matrix(EEM) spectroscopy showed that photoexposure changed both the shapes and the intensities of the EEM spectra of the biogenic POM; the regions of the T1 and T2 peaks were susceptible to photoexposure. Modeling by parallel factor analysis(PARAFAC) decomposed the EEMs of the biogenic POM into four valid components, i.e., terrestrial or microbial humic-like substances, tryptophan-like proteins, tyrosinelike proteins and hydrophobic proteins. The humic-like substances in the biogenic POM from the effluents were subject to lower decreases(17.0 % and 11.6 %).Throughout the entire incubation time, the PARAFAC components in the biogenic DOM were dominated by elimination mechanisms rather than by production through photodissolution of the biogenic POM.

关键词：生物颗粒废水排放光化学有机物质污水处理厂聚甲醛蛋白质比表面积

Thermodynamic properties of San Carlos olivine at high temperature and high pressure

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Acta Geochimica 2018年第2期37卷 171-179页

作者： Chang Su Yonggang Liu Wei Song Dawei Fan zhigang wang Hongfeng Tang Key Laboratory of High-Temperature and High-Pressure Study of the Earth's Interior Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China University of Chinese Academy of Sciences Beijing 100049China National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid Physics Chinese Academy of Engineering Physics Mianyang 621900 China

In this study, the thermal expansion and heat capacity of San Carlos olivine under high temperature and high pressure are reported. Combining accurate sound velocity data under different P–T conditions with density and heat capacity data at ambient pressure, the density,adiabatic bulk modulus, shear modulus, and most importantly, thermal expansion and heat capacity, of San Carlos are extracted to 14 GPa by a numerical procedure using classic thermodynamic relationships. These data are in agreement with published findings. To estimate the temperature gradient in the upper mantle, we also report the fitting equations of thermal expansion and heat capacity of San Carlos olivine as a function of both temperature and pressure to the P–T condition of the 410 km discontinuity,which provide the thermodynamic properties with increasing depth in the Earth's interior.

关键词： San Carlos olivine Thermodynamic property Thermal expansion Heat capacity Temperature gradient

Superatomic-based chirality:Asymmetric structures constructed by superatoms

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Aggregate 2024年第4期5卷 220-225页

作者： Famin Yu Rui Li Xinrui Yang Yulei Shi zhigang wang Institute of Atomic and Molecular Physics Jilin UniversityChangchunChina Key Laboratory of Material Simulation Methods and Software of Ministry of Education College of PhysicsJilin UniversityChangchunChina Department of Physics Capital Normal UniversityBeijingChina

Chirality is one of the fundamental properties of molecules traditionally con-structed from ***,we report for theﬁrst time the successful construction of asymmetric chiral structures utilizing highly symmetric endohedral metallo-fullerene superatoms based on their own bonding ***ﬁcally,stable mirror-symmetric sinister and rectus structures are obtained by selecting a super-atom capable of forming four chemical bonds as the chiral *** analysis shows that the chiral vibration frequency of superatomic assemblies can be as low as a few wavenumbers,which greatly expands the range of chiral spectra com-pared to atom-based *** term this type of chirality based on superatoms as“superatomic-based chirality”.It is anticipated that this work will signiﬁcantly expand the variety of chiral structures at the atomic level.

关键词： assembly atomic level chirality superatom

Do Nutrition and Health Affect Migrant Workers' Incomes?Some Evidence from Beijing,China

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China & World Economy 2010年第5期18卷 105-124页

作者： Shi Zheng zhigang wang Holly wang Shunfeng Song School of Business Renmin University of China Beijing China School of Agricultural Economics and Rural Development Renmin University of China Beijing China Department of Agricultural Economics Purdue University West Lafayette USA Department of Economics University of Nevada Reno USA

Migrant workers have become a major element of the labor force in Chinese cities, making important contributions to the economy while forming a socially disadvantaged group. Existing research on the relationship between the level of nutrition and health and income in China mainly focuses on farmers living in rural areas. Based on a Mincer equation and using a survey in Beijing, this paper examines the relationship between migrant workers＂ nutrition and health levels and their monthly incomes. We find that the nutrition intake and the body mass index have positive effects on income while duration of illness and daily working hours have negative effects. These conclusions imply that the Chinese Government should put more emphasis on improving migrant workers＇ well-being, including offering educational programs on nutrition and health, and enhancing medical insurance and the old-age insurance system.

关键词： health migrant workers monthly income nutrition