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Exchange bias for ferromagnetic/antiferromagnetic bilayers with the uniaxial anisotropy being misaligned with the exchange anisotropy

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science china(Physics,Mechanics & Astronomy) 2009年第12期52卷 1885-1892页

作者： bai yuhao1 & yun guohong1,2.1 college of physical science and technology,{2. mongolia University,hohhot 01002.,china 2.Key Laboratory of Physics and Chemistry of Functional Materials,college of Physics and Electronic Information,{2. mongolia Normal University,hohhot 01002.,china 1. college of physical {2. and technology Inner Mongolia University Hohhot 010021 China 2. Key Laboratory of Physics and Chemistry of Functional Materials College of Physics and Electronic Information Inner Mongolia Normal University Hohhot 010022 China

Using the principle of minimal energy and S-W model,the exchange bias for ferromagnetic/antiferro-magnetic bilayers has been investigated when the uniaxial anisotropy is misaligned with the exchange anisotropy. According to the relation between the energy of the bilayer and the orientation of ferro-magnetic magnetization,it is found that the bilayer will be in the monostable state or bistable state when the external field is absent in the initial magnetization state. The monostable state or bistable state of the bilayer,which determines the angular dependence of exchange bias directly,is controlled by the competition between the exchange anisotropy and uniaxial anisotropy. When the applied field is parallel to the intrinsic easy axes and intrinsic hard axes,one of the switching fields of the hysteresis loop shows an abrupt change,while the other keep continuous by analyzing the magnetization reversal processes. Consequently,the exchange bias field and the coercivity will show a jump phenomenon. The numerical calculations indicate that both the magnitude and direction of the exchange anisotropy will significantly affect the angular dependence of exchange bias. The jump phenomenon of exchange bias is an intrinsic property of the bilayer,which is dependent on the interfacial exchange-coupling constant,the orientation of the exchange anisotropy,the thickness and uniaxial anisotropy constant of the ferromagnetic layer.

关键词： monostable state bistable state intrinstic easy axis intrinstic hard axis switching field

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Size effect of the elastic modulus of rectangular nanobeams:Surface elasticity effect

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Chinese Physics B 2013年第10期22卷 424-428页

作者：姚海燕云国宏范文亮 college of Ordos Inner Mongolia University inner mongolia Key Laboratory of Nano{2. and Nanotechnology college of physical {2. and technology Inner Mongolia University college of Physics and Electronic Information Inner Mongolia Normal University

The size-dependent elastic property of rectangular nanobeams （nanowires or nanoplates） induced by the surface elas- ticity effect is investigated by using a developed modified core-shell model. The effect of surface elasticity on the elastic modulus of nanobeams can be characterized by two surface related parameters, i.e., inhomogeneous degree constant and surface layer thickness. The analytical results show that the elastic modulus of the rectangular nanobeam exhibits a distinct size effect when its characteristic size reduces below 1 O0 nm. It is also found that the theoretical results calculated by a mod- ified core-shell model have more obvious advantages than those by other models （core-shell model and core-surface model） by comparing them with relevant experimental measurements and computational results, especially when the dimensions of nanostructures reduce to a few tens of nanometers.

关键词： size effects elastic modulus nanobeams surface elasticity

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Improved simulation of winter wheat yield in North china Plain by using PRYM-Wheat integrated dry matter distribution coefficient

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Journal of Integrative Agriculture 2024年第4期23卷 1381-1392页

作者： Xuan Li Shaowen Wang Yifan Chen Danwen Zhang Shanshan Yang Jingwen Wang Jiahua Zhang yun bai Sha Zhang Research Center for Remote Sensing and Digital Earth College of Computer Science and TechnologyQingdao UniversityQingdao266071China Center for Geospatial Information Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China School of Geographical sciences Hebei Normal UniversityShijiazhuang 050024China

The accurate simulation of regional-scale winter wheat yield is important for national food security and the balance of grain supply and demand in ***,most remote sensing process models use the“biomass×harvest index(HI)”method to simulate regional-scale winter wheat ***,spatiotemporal differences in HI contribute to inaccuracies in yield simulation at the regional ***-series dry matter partition coefficients(Fr)can dynamically reflect the dry matter partition of winter *** this study,Fr equations were fitted for each organ of winter wheat using site-scale *** equations were then coupled into a process-based and remote sensingdriven crop yield model for wheat(PRYM-Wheat)to improve the regional simulation of winter wheat yield over the North china Plain(NCP).The improved PRYM-Wheat model integrated with the fitted Fr equations(PRYM-Wheat-Fr)was validated using data obtained from provincial yearbooks.A 3-year(2.00-2.02.averaged validation showed that PRYM-Wheat-Fr had a higher coefficient of determination(R^(2.=0.55)and lower root mean square error(RMSE=0.94 t ha^(-1))than PRYM-Wheat with a stable HI(abbreviated as PRYM-Wheat-HI),which had R^(2. and RMSE values of 0.30 and 1.62.t ha^(-1),*** PRYM-Wheat-Fr model also performed better than PRYM-Wheat-HI for simulating yield in verification years(2.13-2.15).In conclusion,the PRYM-Wheat-Fr model exhibited a better accuracy than the original PRYM-Wheat model,making it a useful tool for the simulation of regional winter wheat yield.

关键词： dry matter partition remote sensing model winter wheat yield North china Plain

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Diabetes mellitus in patients with type 1 autoimmune pancreatitis at diagnosis and after corticosteroid therapy

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Hepatobiliary & Pancreatic Diseases International 2024年第4期23卷 393-398页

作者： Mei-Zi Li Tao Guo yun-Lu Feng Sheng-Yu Zhang Xiao-Yin bai Xi Wu Kai Xu Ai-Ming Yang Department of Gastroenterology State Key Laboratory of Complex Severe and Rare DiseasesPeking Union Medical College HospitalPeking Union Medical College and Chinese Academy of Medical SciencesBeijing 100730China Department of Radiology Peking Union Medical College HospitalPeking Union Medical College and Chinese Academy of Medical SciencesBeijing 100730China

Background:A high prevalence of diabetes mellitus(DM)coexisting with autoimmune pancreatitis(AIP)is ***,evidence on the circumstances under which corticosteroid therapy(CST)for AIP improves or worsens DM is *** study aimed to demonstrate and identify predictors of DM control under the influence of ***:Patients diagnosed with type 1 AIP were enrolled from a prospectively maintained cohort and were classified into three groups according to the chronology in which AIP and DM were diagnosed:pre-existing DM(pDM),concurrent DM(cDM),and non-DM(nDM).The responses of DM to CST were assessed when corticosteroid was ceased or tapered to a maintenance dose and classified as‘improvement’and‘non-improvement’(including‘no change’and‘exacerbation’).Results:Among 101 patients with type 1 AIP,52.51.5%)patients were complicated with DM at the time of AIP diagnosis,with 36 patients in the cDM group and 16 patients in the pDM *** incidences of diffuse pancreatic swelling(72.2.)and pancreatic body/tail involvement(91.7%)were significantly higher in the cDM group than in both the pDM and nDM *** the 52.patients with DM,CST was administered in 48 *** logistic analysis identified that elevated serum gamma-glutamyl transferase(GGT)level at AIP diagnosis[odds ratio(OR)=0.032.95%confidence interval(CI):0.003-0.412.P=0.008]and pancreatic atrophy after CST(OR=0.02.,95%CI:0.003-0.2.5,P=0.003)were negatively associated with DM control ***:Patients with diffuse pancreatic swelling and pancreatic body/tail involvement in pancreatitis tended to be complicated with cDM at AIP *** exerted a beneficial effect on the clinical course of DM in nearly half of the AIP patients complicated with DM at diagnosis,particularly in those without elevated serum GGT levels at diagnosis and who did not experience pancreatic atrophy after CST.

关键词： Type 1 autoimmune pancreatitis Diabetes mellitus Corticosteroid therapy Predictive factor Pancreatic atrophy

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Design of 10 MeV electron linear accelerator for space environment simulation

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NUCLEAR science AND TECHNIQUES 2024年第10期35卷 1-14页

作者： Zhang, Shu Meng, Cai Zhou, Zu-Sheng He, Xiang Zhang, Jing-Ru Iqbal, Munawar Zhang, Zhan-Dong bai, Bo-Wen Chi, yun-Long Chinese Acad Sci Inst High Energy Phys Beijing 100049 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Harbin Inst Technol Inst Special Environm Phys Sci Shenzhen 518055 Peoples R China

A compact 10 MeV S-band irradiation electron linear accelerator (linac) was developed to simulate electronic radiation in outer space and perform electron irradiation effect tests on spacecraft materials and devices. According to the requirements of space environment simulation, the electron beam energy can be adjusted in the range from 3.5 to 10 MeV, and the average current can be adjusted in the range from 0.1 to 1 mA. The linac should be capable of providing beam irradiation over a large area of 1 m2.documentclass[12.t]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${\hbox {m}2.$$\end{document} with a uniformity greater than 90% and a scanning rate of 100 Hz. A novel method was applied to achieve such a high beam scanning rate by combining a kicker and a scanning magnet. Based on this requirement, a design for the 10 MeV linac is proposed with an RF power pulse repetition rate of 500 Hz; it includes a thermal cathode electron gun, a bunching-accelerating section, and a scanning transport line. The detailed physical design and dynamic simulation results of the proposed 10 MeV electron linac are presented in this paper.

关键词： Electron linac Accelerating structure Beam scanning Beam homogenization Irradiation linac

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A novel semi-dominant allele of the transmembrane NAC transcription factor ZmNTL2.reduces the size of multiple maize organs

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The Crop Journal 2024年第3期12卷 676-687页

作者： Chuan Li yun bai Yuwei Hou Siyu Wang Yue Xin Tao Yu Jing Wang Xiaowei Liu Hongyang Yi Chao Xia Hai Lan Moju Cao State Key Laboratory of Crop Gene Exploration and Utilization in Southwest china Maize Research InstituteSichuan Agricultural UniversityChengdu 611130SichuanChina Jilin Engineering Research Center for Crop Biotechnology Breeding College of Plant ScienceJilin UniversityChangchun 130012JilinChina

Maize plant architecture influences planting density and,in turn,grain *** of the plant architecture-related traits can be described as organ *** describe a miniature maize mutant,Tiny plant 4(Tip4),which exhibits reduced size of multiple organs and exhibits a semi-dominant monofactorial inheritance *** cloning confirmed that a 4-bp deletion in the NAC TF with transmembrane motif 1-Like(NTL)gene ZmNTL2.denoted as ZmNTL2.(Δ),confers the Tip4 ***-PCR showed that ZmNTL2.was expressed in all tested ***2.functions as a transcriptional activator and is located in both the nucleus and *** mutation does not affect the mRNA abundance of ZmNTL2.locus,but it does result in the loss of transmembrane domain and confines the ZmNTL2.(Δ)protein to the *** out ZmNTL2.has no effect on maize organ size development,indicating that the 4-bp deletion might be a gain-of-function mutation in organ size *** transcriptome sequencing with cytokinin and auxin content determination suggests that the decreased organ size may be possibly mediated by changes in hormone homeostasis.

关键词： Organ size c-ray mutagenesis Membrane-bound NAC TF Hormone homeostasis Maize

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平面波展开法计算二维磁振子晶体带结构

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物理学报 2011年第7期60卷 700-703页

作者：曹永军云国宏那日苏内蒙古大学物理科学与技术学院呼和浩特010020 内蒙古自治区功能材料物理与化学重点实验室和内蒙古师范大学物理与电子信息学院呼和浩特010022

磁振子晶体是光子晶体或声子晶体在磁性材料领域内的替代品,是近来的一个研究热点.本文提出了磁振子晶体领域内的一种平面波展开法,其较传统的平面波展开法能节约一半以上的计算时间.采用此方法,数值计算了由Fe/EuO二种铁磁材料构成的... 详细信息

磁振子晶体是光子晶体或声子晶体在磁性材料领域内的替代品,是近来的一个研究热点.本文提出了磁振子晶体领域内的一种平面波展开法,其较传统的平面波展开法能节约一半以上的计算时间.采用此方法,数值计算了由Fe/EuO二种铁磁材料构成的二维磁振子晶体带结构.数值计算结果表明,在一定的体积填充率下,有自旋波带隙的出现;影响磁振子晶体带隙结构形成的主要因素是有效场中的交换作用场,其他作用场的影响相对很小.

关键词：磁振子晶体带隙平面波展开法

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TiO_2.assisted photo-catalysis degradation process of dye chemicals

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Journal of Environmental sciences 2001年第1期13卷 64-68页

作者： LI Fang\|bai 1,2., GU Guo\|bang\+2. HUANG Guo\|feng\+1, GU yun\|li\+2. WAN Hong\|fu\+1 (1.Guangdong Institute of Eco\|Environment and Soil {2.,Guangzhou 510650, china. E\|mail: fbli@*** 2.college of Chemical Engineering, South Technolog Guangdong Institute of Eco-Environment and Soil science College of Chemical Engineering South China Technology University Guangzhou China. fbli@***

The photo-catalytic degradation pathway and degradation products of methylene blue, rhodamine B, methyl orange, and malachite green in aqueous TiO2.suspension irradiated by high pressure mercury lamp by means of UV-visible absorption spectra and ion chromatography were investigated. The photo-catalysis degradation of dye solutions with charges was greatly effected by pH value owing to the electrostatic model. The photo-degradation rate of dyes anion increased with the decrease of pH value, in contrast, the photo-degradation rate of dyes cation increased with the increase of pH value. And the absorption peaks diminished with a blue shift. After illuminated for 30 minutes, a part of dye chemicals were completely mineralized and transferred into inorganic species including chloride ion, ammonium ion, nitrate ion, sulfate ion. And the addition of 100 mmol/L H2.2.promoted the formation of inorganic species. In this study, the quantity of ammonium ion was much more than that of nitrate ion. That indicated the formation of nitrate is from ammonium. The purification rate of COD in four kinds of dye solution was 71.7%-88.7%. The decrease of COD of dyes solution implies the feasibility of the environmental application of photo-catalyzed process.

关键词： Chromatography Irradiation Mercury vapor lamps pH effects Photocatalysis Spectrum analysis Titanium oxides

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Surface reconstruction and structural transformation of twodimensional Ni-Fe MOFs for oxygen evolution in seawater media

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Nano Research 2024年第4期17卷 2429-2437页

作者： Liyuan Xiao Xue bai Jingyi Han Tianmi Tang Siyu Chen Hui Qi Changmin Hou Fuquan bai Zhenlu Wang Jingqi Guan Institute of physical Chemistry College of ChemistryJilin UniversityChangchun 130021China The Second Hospital of Jilin University Changchun 130021China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China Laboratory of Theoretical and Computational Chemistry Institute of Theoretical ChemistryCollege of ChemistryChangchun 130023China

As a four-electron transfer reaction,oxygen evolution reaction(OER)is limited by large overpotential and slow ***,we in-situ synthesized two-dimensional(2.)Ni-Fe metal-organic framework nanosheets on nickel foam(NixFe-TPA/NF,TPA=terephthalic acid)for oxygen evolution in alkaline and alkaline seawater *** 1 M KOH,Ni3Fe-TPA/NF shows a low overpotential(η10)of 189 mV at 10 mA·cm^(-2. and an ultra-low overpotential of only 2.0 mV at 500 mA·cm^(-2..In alkaline seawater,Ni3Fe-TPA/NF still provides impressive OER performance,with anη10 of 2.5 ***-situ Raman characterization results show that the phase transition occurs during the OER,and Ni3FeOOH with more oxygen vacancies is in-situ formed,reducing the OER energy *** functional theory(DFT)reveals that the synergy between Ni and Fe reduces the energy barrier and accelerates the rate-determining *** addition,the ultra-thin 2. sheet structure and the close combination of Ni3FeOOH and highly conductive NF support ensure the high catalytic OER ***,the surface reconstruction and structural modification strategy can be used to design and prepare high-performance OER electrocatalysts for energy-related applications.

关键词： density functional theory(DFT)calculation Ni3FeOOH oxygen evolution reaction seawater electrolysis surface reconstruction

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Theoretical studies on Ru(fppz)_2.CO)L (L=N-heterocyclic ligand):Electronic structure,absorption,phosphorescence,and solvatochromism

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science china Chemistry 2008年第12期51卷 1211-1220页

作者： LIU Tao1, ZHOU Xin1, bai FuQuan1, ZHANG JianPo1, XIA BaoHui1,2. PAN QingJiang3 & ZHANG HongXing1 1 State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 13002., china 2.{2. of Chemistry, Jilin University, Changchun 13002., china 3 Laboratory of physical Chemistry, School of Chemistry and Materials science, Heilongjiang University, Harbin 150080, china State Key Laboratory of Theoretical and Computational Chemistry Institute of Theoretical Chemistry Jilin University Changchun 130023 China college of Chemistry Jilin University Changchun 130023 China Laboratory of physical Chemistry School of Chemistry and Materials Science Heilongjiang University Harbin 150080 China

A series of ruthenium(II) complexes Ru(fppz)2.CO)L [fppz = 3-trifluoromethyl-5(2.pyridyl)pyrazole; L = pyridine (1), 4-dimethylaminopyridine (2., 4-cyanopyridine (3)] were designed and investigated theo-retically to explore their electronic structures, absorption, and emissions as well as the solvatochrom-ism. The singlet ground state and triplet excited state geometries were fully optimized at the B3LYP/LANL2.Z and CIS/LANL2.Z level, respectively. The HOMO of 1-3 is composed of dyz(Ru) atom and π(fppz). The LUMO of 1 and 2.is dominantly contributed by π*(fppz) orbital, but that of 3 is con-tributed by π*(L). Absorption and phosphorescence in vacuo, C6H12. and CH3CN media were calculated using the TD-DFT level of theory with the PCM model based on the optimized ground and excited state geometries, respectively. The lowest-lying absorption of 1 and 2.at 387 and 391 nm is attributed to {[dyz(Ru) + π(fppz)] → [π*(fppz)]} transition, but that of 3 at 479 nm is assigned to {[dyz(Ru) + π(fppz)] → [π*(L)]} transition. The phosphorescence of 1 and 2.at 436 and 438 nm originates from 3{[dyz(Ru) + π(fppz)] [π*(fppz)]} excited state, while that of 3 at 606 nm is from 3{[dyz(Ru) + π(fppz)] [π*(L)]} excited state. The calculation results showed that the absorption and emission transition character can be changed from MLCT/ILCT to MLCT/LLCT transition by altering the substituent on the L ligand. The phosphorescence of 1 and 2.does not have solvatochromism, but that of 3 at 606 nm (vacuo), 584 nm (C6H12., and 541 nm (CH3CN) is strongly dependent on the solvent polarity, so introducing elec-tron-withdrawing group on ligand L will induce remarkable solvatochromism.

关键词： ruthenium complex DFT phosphorescence solvatochromism

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