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哈茨木霉UN⁃2β⁃葡聚糖酶诱导及对水稻纹枯病的抑菌防病作用

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西南农业学报 2024年第1期37卷 119-127页

作者：杨春林席亚东胡强李洪浩四川省农业科学院成都610066 四川省乐山市植保植检站四川乐山614000 四川省农业科学院植物保护研究所成都610066 乐山师范学院竹类病虫防控与资源开发四川省重点实验室四川乐山614000

【目的】优化哈茨木霉UN⁃2菌株产β⁃葡聚糖酶的培养基组分及发酵参数,提高其产酶能力,研究β⁃葡聚糖酶粗酶液对水稻纹枯病病原菌的拮抗作用及田间防效,阐明哈茨木霉菌株UN⁃2在水稻纹枯病生物防治中的应用潜力。【方法】采用单因素试验... 详细信息

【目的】优化哈茨木霉UN⁃2菌株产β⁃葡聚糖酶的培养基组分及发酵参数,提高其产酶能力,研究β⁃葡聚糖酶粗酶液对水稻纹枯病病原菌的拮抗作用及田间防效,阐明哈茨木霉菌株UN⁃2在水稻纹枯病生物防治中的应用潜力。【方法】采用单因素试验考察不同碳源、氮源和金属离子对哈茨木霉菌株UN⁃2产β⁃葡聚糖酶的影响,利用正交试验确定木霉菌株产β⁃葡聚糖酶的最适温度、pH、接种量、瓶装量、摇床转速和发酵时间,优化哈茨木霉菌株UN⁃2产β⁃葡聚糖酶诱导发酵条件;通过体外拮抗试验和田间防效试验研究β⁃葡聚糖酶粗酶液对水稻纹枯病的抑菌防病作用。【结果】哈茨木霉菌株UN⁃2发酵产β⁃葡聚糖酶最佳碳源和氮源分别为麦麸和硫酸铵,金属离子Ca^(2+)和Mg^(2+)对木霉产β⁃葡聚糖酶活性具有明显的促进作用。哈茨木霉UN⁃2菌株以10.0 g/L麦麸、0.5 g/Lβ⁃葡聚糖、4.0 g/L硫酸铵、1.5 mmol/L Ca^(2+)、0.5 mmol/L Mg^(2+)为培养基,在温度32℃、起始pH 6.5、接种量8 mL(10^(6) cfu/mL)、瓶装量30 mL/250 mL、摇床转速160 r/min条件下发酵64 h获得β⁃葡聚糖酶活性最高。木霉菌株UN⁃2产β⁃葡聚糖酶粗酶液对立枯丝核菌和禾谷丝核菌的菌丝生长和菌核萌发具有明显的抑制作用,对由立枯丝核菌引起的水稻纹枯病的田间防效达70.45%,与5%井冈霉素处理相当,β⁃葡聚糖酶粗酶液处理可提高水稻结实率和稻粒充实度。【结论】哈茨木霉菌株UN⁃2在最优发酵条件下产酶活性达97.68 U/mL,β⁃葡聚糖酶粗酶液对水稻纹枯病具有较强的抑菌防病效果,并对水稻植株具有一定的促生作用。

关键词：哈茨木霉 β⁃葡聚糖酶诱导条件水稻纹枯病防效

Part-based on-road vehicle detection using hidden random field

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Science China(Information Sciences) 2011年第12期54卷 2542-2549页

作者： ZHANG XueTao 1 , HE YongJian 1,2 & WANG Fei 1 1 Institute of Artificial Intelligence and Robotics, xi’an Jiaotong University, xi’an 710049, China 2 xi’an Communication Institute, xi’an 710049, China Institute of Artificial Intelligence and Robotics Xi"an Jiaotong University xi"an Communication Institute

This paper addresses the problem of detecting on-road vehicles in still images captured by the on-board cameras. We model this as a labelling inference procedure and incorporate the part-based representation of the rear-ends of vehicle within a hidden random field based probabilistic model. Representing objects with parts inherently good for dealing with occlusions. In the proposed model, the part labels form a hidden layer in the graphical model. Our approaches can automatically find the latent parts without explicit indication during training. The experiment is performed on the database with real images with a promising result.

关键词： vehicle detection hidden random field part-based model

High-throughput deformation potential and electrical transport calculations

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npj Computational Materials 2023年第1期9卷 378-385页

作者： Yeqing Jin xiangdong Wang Mingjia Yao Di Qiu David J.Singh Jinyang xi Jiong Yang Lili xi Materials Genome Institute Shanghai UniversityShanghai 200444China School of Physics and Electronic Science East China Normal UniversityShanghai 200241China Zhejiang Laboratory HangzhouZhejiang 311100China Department of Physics and Astronomy University of MissouriColumbiaMO 65211USA

The deformation potential plays an important role in electrical transport properties, but in the context of high-throughputsearches requires a consistent and readily computable reference level. Here, we design a high-throughput method forcalculating the deformation potential for semiconductors in the MatHub-3d database. The deformation potential is obtainedfrom the volume-dependent band edge (valence band maximum and conduction band minimum) variations with respect tothe reference level. In order to adapt the calculation of reference level to a high-throughput manner, the average value of thefirst valence electron energy band associated with each compound is used as the reference level. Deformation potentials for11,993 materials are calculated using the above-mentioned method. By considering the calculated deformation potentials,electronic structures, and bulk moduli, 9957 compounds with converged electrical transport properties are obtained. 332promising p-type thermoelectric materials, and 321 n-type entries are then proposed. Among them, 156 compounds arescreened to having both potentially good n- and p-type thermoelectric transport properties. The band structures and chemicalbonding information for several typical compounds are further presented to reveal favorable band and bonding features forthermoelectrics.

关键词： deformation potential transport

The non-abelian Hodge correspondence on some non-K?hler manifolds

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Science China Mathematics 2023年第11期66卷 2545-2588页

作者： Changpeng Pan Chuanjing Zhang xi Zhang School of Mathematics and Statistics Nanjing University of Science and TechnologyNanjing 210094China School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026China

The non-abelian Hodge correspondence was established by Corlette(1988),Donaldson(1987),Hit chin(1987)and Simpson(1988,1992).It states that on a compact Kahler manifold(X,ω),there is a one-to-one correspondence between the moduli space of semi-simple flat complex vector bundles and the moduli space of poly-stable Higgs bundles with vanishing Chern *** this paper,we extend this correspondence to the projectively flat bundles over some non-Kahler manifold ***,we prove an existence theorem of Poisson metrics on simple projectively flat bundles over compact Hermitian *** its application,we obtain a vanishing theorem of characteristic classes of projectively flat ***,on compact Hermitian manifolds which satisfy Gauduchon and astheno-K?hler conditions,we combine the continuity method and the heat flow method to prove that every semi-stable Higgs bundle withΔ(E,?E)·[ωn-2]=0 must be an extension of stable Higgs *** the above results,over some compact non-Kahler manifolds(M,ω),we establish an equivalence of categories between the category of semi-stable(poly-stable)Higgs bundles(E,?E,φ)withΔ(E,?E)·[ωn-2]=0 and the category of(semi-simple)projectively flat bundles(E,D)with(-1)(1/2)FD=α■IdE for some real(1,1)-formα.

关键词： projectively flat bundle Higgs bundle non-Kahler the Hermitian-Yang-Mills flow e-regularity theorem

Properties for Solutions of Nonlinear Functional Difference Equations

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Chinese Quarterly Journal of Mathematics 2005年第3期20卷 258-264页

作者： DUANMU Lian-xi Department of Mathematics Jining Normal Technical College Jining 272125 China

In this paper, some sufficient and necessary conditions are established for the oscillatory of solutions for nonlinear functional difference equations, which extend and improve some corresponding results obtained and ... 详细信息

关键词： functional difference equation oscillation increasing operator fixed point theorem

Light-Driven Dinitrogen Activation with Transition Metal Complexes:Mechanisms and Applications

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Chinese Journal of Chemistry 2023年第18期41卷 2400-2407页

作者： Xuan-Xuan Zhao Junnian Wei Zhenfeng xi Bejing National Laboratory for Molecular Sciences Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of EducationCollege of Chemistryand Molecular EngineeringPeking UniversityBeijing 100871China

Comprehensive Summary,The Haber-Bosch process,which is used for ammonia(NH3)synthesis,requires vast amounts of energy,accounting for approximately 1%—2%of the world's annual energy ***,researchers in both industry and academia are interested in developing sustainable and environmentally friendly methods for synthesizing nitrogenous compounds at ambient conditions using renewable energy sources such as visible *** several examples of thermal activation of dinitrogen molecules have been demonstrated using various transition metals and ligand frameworks,the use of light to weaken or split the strong N—N bond has been less *** article presents an overview of molecular complexes capable of dinitrogen photocleavage and provides mechanistic insights into the photoactivation process through experimental and theoretical *** believe this review will provide readers with an in-depth understanding of the current state-of-the-art and future research perspectives,particularly in the use of visible light for dinitrogen activation and transformation.

关键词： Photochemistry N_(2)reduction Dinitrogen complexes Photoactivation Dinitrogen transformation Photoredox catalysis

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零能耗集装箱建筑技术研究

上海建设科技 2024年第1期 18-23页

作者：袁龙飞潘曦杨磊上海建工五建集团有限公司上海200333 上海建工集团股份有限公司上海200080

针对集装箱建筑居住舒适性差、能耗需求高的特点,结合既有研究成果,对零能耗建筑理念在集装箱建筑中应用时涉及的主被动关键技术,即外围护结构保温性能、建筑气密性、热桥处理等被动式技术和可再生能源与智能控制系统组成的能源调控主... 详细信息

针对集装箱建筑居住舒适性差、能耗需求高的特点,结合既有研究成果,对零能耗建筑理念在集装箱建筑中应用时涉及的主被动关键技术,即外围护结构保温性能、建筑气密性、热桥处理等被动式技术和可再生能源与智能控制系统组成的能源调控主动式技术进行了总结分析。以集装箱建筑为样板,对现阶段零能耗建筑发展过程中存在的问题进行了展望。

关键词：零能耗建筑集装箱全生命周期评估外围护热桥气密性可再生能源

基于自适应阈值的北斗三频周跳探测与修复方法

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科学技术与工程 2024年第3期24卷 1110-1117页

作者：王凯锋孙永荣付希禹吴玲南京航空航天大学导航研究中心南京211106

针对单频多普勒积分法中周跳检测量噪声大,且动态环境下固定阈值不能反映实际周跳检测量噪声的问题,设计了北斗三频多普勒积分组合法,基于滑动窗口和高度角信息构建了自适应阈值模型;联合无几何相位法对北斗三频数据进行周跳探测,以解... 详细信息

针对单频多普勒积分法中周跳检测量噪声大,且动态环境下固定阈值不能反映实际周跳检测量噪声的问题,设计了北斗三频多普勒积分组合法,基于滑动窗口和高度角信息构建了自适应阈值模型;联合无几何相位法对北斗三频数据进行周跳探测,以解决三频多普勒积分组合法存在不敏感周跳的问题;采用空间搜索法对周跳组合进行解算,并遵循最小1-范数原则,对北斗三频周跳进行检验修复。实验结果表明:在动态环境下,自适应阈值降低了中、低仰角卫星的周跳误探次数,该方法可探测出包括1周在内的所有周跳组合并正确修复。

关键词：周跳自适应阈值北斗三频多普勒积分无几何相位动态环境

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地震作用下网架结构失效模式的判定方法

工程抗震与加固改造 2024年第3期46卷 64-71页

作者：乐风江陈崧杨富儒方希兵赵文新疆大学建筑工程学院新疆乌鲁木齐830047 新疆建筑结构与抗震重点实验室新疆乌鲁木齐830047 甘肃电通电力工程设计咨询有限公司甘肃兰州730050 武汉理工大学土木工程与建筑学院湖北武汉430070

利用增量动力分析方法,采用多段梁单元对无缺陷网架、考虑节点几何缺陷网架、杆件几何缺陷网架以及综合考虑节点和杆件几何缺陷的网架整体结构在地震作用下的响应进行了研究。对比表明:综合考虑节点和杆件几何缺陷会加速网架结构的失效... 详细信息

利用增量动力分析方法,采用多段梁单元对无缺陷网架、考虑节点几何缺陷网架、杆件几何缺陷网架以及综合考虑节点和杆件几何缺陷的网架整体结构在地震作用下的响应进行了研究。对比表明:综合考虑节点和杆件几何缺陷会加速网架结构的失效进程,施加几何缺陷没有改变网架在同一地震激励下的失效模式。从结构响应的角度,根据网架结构特征点加速度位移曲线、位移时程曲线以及网架塑性杆件比例,提出了地震作用下判别网架结构失效模式的具体标准:若网架跨中位移时程曲线发生明显跳跃,网架塑性杆件占比较小且小于一定限值,可判定网架发生动力稳定失效。若网架跨中位移时程曲线无明显跳跃但逐渐发散,且网架塑性杆件占比较高并大于一定限值,可判定网架发生强度型失效。

关键词：网架结构杆件失稳失效模式几何缺陷动力失稳