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Improving nitrogen management for zero-tillage rice in China

The Crop Journal 2018年第4期6卷 406-412页

作者： Min Huang xuefeng zhou Yingbin Zou Southern Regional Collaborative Innovation Center for Grain and Oil Crops (CICGO) Hunan Agricultural University

Zero-tillage has become increasingly attractive in rice production in *** study was conducted to determine the feasibility of two possible improved N management practices with fewer N applications in zero-tillage rice:(1)two split applications of urea at75 kg N ha^(-1)at mid-tillering and 45 kg N ha^(-1)at panicle initiation(U_(120–2)),and(2)a single application of cross-linked polyacrylamide-coated urea(a slow-release fertilizer)at midtillering at a rate of 150 kg N ha^(-1)(PCU_(150–1)).Three field experiments were conducted to compare grain yield and N-use efficiency among several N treatments:a zero-N control(CK),U_(120–2),PCU_(150–1),a single application of urea at mid-tillering at a rate of 150 kg N ha^(-1)(U_(150–1)),and a commonly recommended N management practice for conventional tillage rice(three split applications of urea with 75 kg N ha^(-1)as basal,30 kg N ha^(-1)at mid-tillering,and 45 kg N ha^(-1)at panicle initiation)(U_(150–3)).Treatments with N application(U_(120–2),PCU_(150–1),U_(150–1),and U_(150–3))produced 1.08–3.16 t ha^(-1)higher grain yields than *** yields under both U_(120–2)and PCU_(150–1)were comparable to that in U_(150–3).Recovery efficiency of N(RE_N),agronomic N-use efficiency(AE_N)and partial factor productivity of applied N(PFP_N)were increased under U_(120–2)and were similar under PCU_(150–1)to those under U_(150–3).U_(150–1)showed lower grain yield,RE_N,AE_N,and PFP_Nthan U_(150–3).These results suggest that U_(150–3)can be replaced with U_(120–2)to achieve both an increase in N-use efficiency and a reduction in number of N applications and or by PCU_(150–1)to achieve a maximum reduction in number of N applications in zero-tillage rice production in China.

关键词： Grain yield N management N-use efficiency Rice Zero-tillage

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Solidification microstructure of M2 high speed steel by different casting technologies

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China Foundry 2011年第3期8卷 290-294页

作者： zhou xuefeng Fang Feng Jiang Jianjing Jiangsu Key Laboratory of Advanced Metallic Materials Southeast University Nanjing 211189 China

The present work investigated the solidification microstructure of AISI M2 high speed steel manufactured by different casting technologies, namely iron mould casting and continuous casting. The results revealed that the as-cast structure of the steel was composed of the iron matrix and the M2C eutectic carbide networks, which were greatly refined in the ingot made by continuous casting process, compared with that by the iron mould casting process. M2C eutectic carbides presented variation in their morphologies and growth characteristics in the ingots by both casting methods. In the ingot by iron mould casting, they have a plate-like morphology and grow anisotropically. However, in the ingot made by continuous casting, the carbides evolved into the fiber-like shape that exhibited little characteristics of anisotropic growth. It was noticed that the fiber-like M2C was much easier to decompose and spheroidize after heated, as a result, the carbides refined remarkably, compared with the case of plate-like carbides in the iron mould casting ingot.

关键词： high speed steel continuous casting iron mould casting eutectic carbide

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以夯实基础提升素养培育思维为导向构建中医基础理论课程多元化考核评价

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中国中医药现代远程教育 2025年第2期23卷 175-178页

作者：吴筱枫李霞周雪丰贵州中医药大学基础医学院贵州贵阳550025

作为中医学的一门传统基础课程,中医基础理论的学习效果影响着学生对后续课程的学习,在深化医学教育教学内容、课程体系和教学方法改革的背景下,为了契合培养医德高尚、医术精湛的中医学人才的要求,课程考核评价逐步转变为以学生为中心... 详细信息

作为中医学的一门传统基础课程,中医基础理论的学习效果影响着学生对后续课程的学习,在深化医学教育教学内容、课程体系和教学方法改革的背景下,为了契合培养医德高尚、医术精湛的中医学人才的要求,课程考核评价逐步转变为以学生为中心,动态的、多元化的综合性考核评价,构建以夯实基础、提升素养、培育思维为导向的综合性评价体系。评价体系由过程性评价和终结性考核评价构成。其中过程性评价又包括阶段性知识考核评价、综合素质考核评价和运用能力考核评价三方面;终结性考核评价主要以期末考试的方式进行。

关键词：考核评价中医基础理论人才培养

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Chemistry,Biosynthesis,and Biological Activity of Halogenated Compounds Produced by Marine Microorganisms

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Chinese Journal of Chemistry 2022年第14期40卷 1729-1750,I0002页

作者： Jiamin Wang Xiaoyan Pang Chunmei Chen Chenghai Gao xuefeng zhou Yonghong Liu Xiaowei Luo CAS Key Laboratory of Tropical Marine Bio-resources and Ecology/Guangdong Key Laboratory of Marine Materia Medica South China Sea Institute of OceanologyChinese Academyof SciencesGuangzhouGuangdong 510301China Institute of Marine Drugs Guangxi University of Chinese MedicineNanningGuangxi 530200China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) GuangzhouGuangdong 511458China University of Chinese Academy of Sciences 19Yuquan RoadBejing 100049China

Natural products derived from marine microorganisms have been received great attention as a potential source of new compound entities for drug *** unique marine environment brings us a large group of halogen-containing natural products with abundant biological functionality and good ***,biosynthetically halogenated reactions are known as a significant strategy used to increase the pharmacological activities and pharmacokinetic properties of *** that a tremendous increase in the number of new halogenated compounds from marine microorganisms in the last five years,it is necessary to summarize these compounds with their diverse structures and promising *** this review,we have summarized the chemistry,biosynthesis(related halogenases),and biological activity of a total of 316 naturally halogenated compounds from marine microorganisms covering the period of 2015 to May *** reviewed chlorinated and brominated compounds with the ratio of 9:1 were predominantly originated from 36 genera of fungi(62%)and 9 bacterial strains(38%)with cytotoxic,antibacterial,and enzyme inhibitory activities,structural types of which are polyketides(38%),alkaloids(27%),phenols(11%),and *** review would provide a plenty variety of promising lead halogenated compounds for drug discovery and inspire the development of new pharmaceutical agents.

关键词： Marine microorganisms Natural products Halogenated compounds Biological activity Biosynthesis

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Enhancing reversibility of LiNi_(0.5)Mn_(1.5)O_(4)by regulating surface oxygen deficiency

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Carbon Energy 2023年第11期5卷 81-89页

作者： Dandan Wang Cong Gao xuefeng zhou Shang Peng Mingxue Tang Yonggang Wang Lujun Huang Wenge Yang Xiang Gao Center for High Pressure Science and Technology Advanced Research(HPSTAR) BeijingChina School of Materials Science and Engineering Harbin Institute of TechnologyHarbinChina

Oxygen deficiency has crucial effects on the crystal structure and electrochemical performance of spinel oxide lithium electrode materials such as LiNi_(0.5)Mn_(1.5)O_(4)(LNMO)*** particular,the oxygen stoichiometry on the crystal surface differs from that on the crystal interior in *** detection of local oxygen loss in LNMO and its correlation with the crystal structure and the cycling stability of LNMO remain *** this study,the effect of oxygen deficiency in LNMO controlled by sintering temperature on the surface crystal structure and electrochemical performance of LNMO is comprehensively *** high concentration of oxygen vacancies segregates at the surface regions of LNMO forming a thin rock‐salt and/or deficient spinel surface *** atomic‐level surface structure reconstruction was demonstrated by annular dark‐field and annular brightfield *** the synthesis of LNMO,the higher sintering temperature results in higher crystallinity but the higher oxygen deficiency in *** high crystallinity of LNMO would increase the thermal stability of LNMO cathodes while the high content of oxygen deficiency would decrease the surface structural stability of ***,the LNMO sintered at a medium temperature of 850°C achieved the best capacity *** results suggest a competitive function mechanism between oxygen stoichiometry and the crystallinity of LNMO on the cycling performance of LNMO.

关键词： electrochemical performance LiNi_(0.5)Mn_(1.5)O_(4) lithium‐ion battery oxygen vacancies surface reconstruction

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Revealing the dominant factor of domain boundary resistance on bulk conductivity in lanthanum lithium titanates

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Journal of Energy Chemistry 2022年第10期31卷 354-359,I0009页

作者： xuefeng zhou Cong Gao Dandan Wang Shang Peng Lujun Huang Wenge Yang Wen-Hua Zhang Xiang Gao Sichuan Research Center of New Materials Institute of Chemical MaterialsChina Academy of Engineering PhysicsChengdu 610200SichuanChina Center for High Pressure Science and Technology Advanced Research Beijing 100094China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina School of Materials and Energy Yunnan UniversityKunming 650500YunnanChina

Perovskite-type lithium lanthanum titanates(LLTO)display a high bulk ionic conductivity and are considered a promising electrolyte for building up to advanced solid-state Li-ion *** LLTO crystals contain a high concentration of intrinsically formed 90ο-rotated domain boundaries(DBs)serving as barriers to bulk Li-ion ***,the mechanism of how the DB concentration and DB resistance can compete with each other to determine the bulk conductivity of LLTO is still *** we report a comprehensive study of LLTO compounds,aimed to unravel the mechanism and hence explore new path(s)for further improving the conductivity of this *** results show that both the sintering temperature and chemical composition can affect significantly the domain structures in *** is found that a decrease in the DB concentration is always accompanied by increased DB resistance due to the increased lattice mismatch at DBs,and vice *** unifying the electrochemical impedance spectroscopy and transmission electron microscopy analysis,it is clearly shown that the high DB resistance,instead of DB concentration,acts as the dominant factor governing the bulk conductivity of *** results thus renew the conventional understanding of the bulk Li-ion conduction in LLTO and shed light on developing novel LLTO electrolyte materials with improved ionic conductivity.

关键词： Solid electrolyte La_(2)/_(3-x)Li_(3x)TiO_(3) Conductivity Domain Domain boundary

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Structural Properties and Energy Analysis of Zr_(x)Cu_(90-x)Al_(10)Ternary Metallic Glasses

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Journal of Harbin Institute of Technology(New Series) 2023年第1期30卷 85-92页

作者： Jingfeng Zhao Xiangxu Xie Feng Chen Kailong Di xuefeng zhou School of Materials Engineering Changshu Institute of TechnologyChangshu 215500JiangsuChina

Classical molecular dynamics(MD)were conducted to study the structure and energy distribution of Zr_(x)Cu_(90-x)Al_(10)(x=20,30,40,50,60,70)ternary *** the Zr composition is 30%,the glass transition temperature reaches the maximum value and the Zr_(30)Cu_(60)Al_(10)owns high glass forming ability(GFA).Analysis of the short⁃range structure shows that there are more low⁃energy Zr⁃centered polyhedron with high coordination number(CN)and Cu and Al⁃centered coordination polyhedron with CN=12 in Zr_(30)Cu_(60_Al_(10)*** the medium⁃range structure is concerned,Zr_(30)Cu_(60_Al_(10)alloy has the largest number of coordination polyhedron connection sharing three atoms and connection in this way presenting the lowest *** low⁃energy and stable short and medium⁃range structures contribute to the high GFA of Zr_(30)Cu_(60_Al_(10).

关键词： molecular dynamics simulations GFA short⁃range structure medium⁃range structure

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Cooling Rate Dependence of Structural Order and Energy Landscape in Zr_(55)Cu_(35)Al_(10) Glass

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Journal of Harbin Institute of Technology(New Series) 2022年第5期29卷 78-85页

作者： Jingfeng Zhao Xiangxu Xie Feng Chen Kailong Di xuefeng zhou School of Materials Engineering Changshu Institute of TechnologyChangshu 215500JiangsuChina

Classical molecular dynamics simulation has been widely used to study the rapid cooling process of preparing amorphous ***,the simulated cooling rate is several orders of magnitude higher than the experimental cooling *** this paper,Zr_(55)Cu_(35)Al_(10)alloy was taken as an *** is found that adding isothermal annealing at a temperature slightly lower than Tand prolonging isothermal annealing time could effectively reduce the cooling *** glassy sample prepared in this way demonstrates significant energetic stability and well-developed short-range and medium-range order.

关键词： classical molecular dynamics simulation cooling rate isothermal annealing energetic stability short-range order medium-range order

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Comparison of cellular responses across multiple passage numbers in Ba/F3-BCR-ABL cells induced by silver nanoparticles

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Science China(Life Sciences) 2012年第10期55卷 898-905页

作者： GUO DaWei ZHANG XiuYan HUANG ZhiHai zhou xuefeng ZHU LingYing ZHAO Yun GU Ning liangsu Key Laboratory for Biomaterials and Devices State Key Laboratory of BioelectronicsSchool of Biological Science&Medical EngineeringSoutheast UniversityNanjing 210096China Suzhou Key Laboratory of Biomedical Materials and Technology Research Institute of Southeast University in SuzhouSuzhou 215123China Cyrus Tang Hematology Center Jiangsu Institute o[HematologyFirst Affiliated HospitalSooehow UniversitySuzhou 215123China

With the rapid development of nanotechnology and increasingly broad bio-application of engineered nanomaterials, their bio- hazards have become a serious public concern. It is believed that the chemical nature, particle size, morphology, and surface chemistry of nanomaterials are key parameters that influence their toxicity. Although cultured ceils have been widely used to evaluate nanomaterial toxicity, it remains unclear whether the passage of these cells affects the evaluation results. In the pre- sent study, Ba/F3 cells transfected with the BCR-ABL gene were subcultured to study the effect of passage number on cell sta- bility and their cellular responses upon exposure to nanomaterials. The results demonstrated that proliferation, cellular senes- cence, BCR-ABL gene expression, cell cycle and apoptosis were stable across multiple passages. Senescence and BCR-ABL gene expression of cells from different passage cells were unchanged when treated with silver nanoparticles （AgNPs）. In addi- tion, the cells at multiple passage numbers were all arrested in the G2/M phase and apoptosis was induced by the AgNPs. These nanoparticles could enter cells via endocytosis and localize in the cndosomes, which were also not influenced by passage number. These data suggest that short-term passage would not affect cultured cell stability and toxicity assessment using these cells would be consistent when maintained appropriately.

关键词： silver nanoparticles (AgNPs) cellular response cell passage stability uptake

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Binding Se into nitrogen-doped porous carbon nanosheets for high-performance potassium storage

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InfoMat 2021年第4期3卷 421-431页

作者： Huijuan Huang Xiao Luo Yu Yao xuefeng zhou Yu Jiang ChunliGuo Jiaqin Liu Xiaojun Wu Yan Yu Hefei National Laboratory for Physical Sciences at the Microscale Department of Materials Science and EngineeringCAS Key Laboratory of Materials for Energy ConversionUniversity of Science and Technology of ChinaHefeiChina College of Environmental Science and Engineering Taiyuan University of TechnologyTaiyuanChina Institute of Industry&Equipment Technology Key Laboratory of Advanced Functional Materials&Devices of Anhui ProvinceHefei University of TechnologyHefeiChina Dalian National Laboratory for Clean Energy(DNL) Chinese Academy of Sciences(CAS)DalianChina

Selenium cathode has been demonstrated as a promising candidate of cathode material for low-cost and high-energy density potassium ion batteries(PIBs).Nevertheless,their applica tions are prevented by poor electrochemical perfor-mance due to the shuttle effect of high-order polyselenides,the sluggish diffu-sion of bigger K+,and the huge volumetric expansion during *** this work,we design a multifunctional Se host(N-HCNS)by grafting ZIF-8 derived microporous carbon onto the surface of N-doped porous carbon *** obtained N-HCNS carbon matrix integrates conductivity,captivity,and immobility abilities,which inhibits the polyselenides shuttle,improves the Se utilization,and buffers the volume change during *** 3D hollow car-bon skeleton enhances the infiltration of *** an cathode for PIBs,the Se@N-HCNS electrode delivers an unprecedented life-span(260 mAh g1 at 1.0 Ag-1 after 2000 cycles)and exhibits a remarkable rate capacity(339 mAh g at 5.0 Ag-l).Density functional theory(DFT)calculation reveals the effective adsorption of K2Se with pyridine and pyrrole nitrogen dop-ing in carbon *** unique synergetic design of electrode not only gives insight into the reaction mechanism but also highly emphasi zes the potential capabilities of N doped carbon in K-Se batteries.

关键词： nitrogen-doped carbon potassium-selenium batteries(K-Se batteries) selenium cathodes

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