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Comparative Analysis of the Development of Agricultural listed Companies

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Asian Agricultural Research 2011年第2期3卷 141-144页

作者： QIN Zhi-gang,FU li-min,MA chen,li Dong-sheng School of Economics,Yangtze University,Jingzhou 434100,China

On the basis of industrial division of China's Securities Regulatory Commission,listed companies in the processing industry of agro-products and food production industry have also been incorporated into agricultural listed *** discrepancy of agricultural listed companies is *** main manifestations are small population quantity,slow development,weak growing capacity,relatively poor rationality and unbalanced regional *** internal causes of this kind of situation lie in the weak quality and inadequate developmental driving force of agricultural listed companies,while the external causes are the capital chasing and unbalanced political support of the ***,the key of quickening the development of agricultural listed companies is inner power and external ***,the political thoughts of the development of agricultural listed companies are proposed.

关键词： Agricultural listed companies Developmental situat

Engineering atomic Rb-N configurations to tune radical pathways for highly selective photocatalytic H2O2 synthesis coupled with biomass valorization

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Journal of Energy Chemistry 2025年第1期100卷 215-225页

作者： Jiaye li Shuang Pan Yihuang chen Qiong liu College of Chemistry and Materials Engineering Wenzhou University Guangdong Provincial Key Laboratory of Chemical Measurement and Emergency Test Technology (China) Institute of Analysis Guangdong Academy of Sciences (China National Analytical CenterGuangzhou)

Photocatalytic oxygen reduction for hydrogen peroxide （H2O2） synthesis presents a green and costeffective production ***,achieving highly selective H2O2synthesis remains challenging,necessitating precise control over free radical reaction pathways and minimizing undesirable oxidative ***,we report for the visible light-driven simultaneous co-photocatalytic reduction of O2to H2O2and oxidation of biomass using the atomic rubidium-nitride modified carbon nitride（CNRb）.The optimized CNRb catalyst demonstrates a record photoreduction rate of 8.01 mM h-1for H2O2generation and photooxidation rate of 3.75 mM h-1for furfuryl alcohol to furoic acid,achieving a remarkable solar-to-chemical conversion （SCC） efficiency of up to 2.27%.Experimental characterizations and DFT calculation disclosed that the introducing atomic Rb–N configurations allows for the high-selective generation of superoxide radicals while suppressing hydroxyl free radical *** is because the Rb–N serves as the new alternative site to perceive a stronger connection position for O2adsorption and reinforce the capability to extract protons,thereby triggering a high selective redox product *** study holds great potential in precisely regulating reactive radical processes at the atomic level,thereby paving the way for efficient synthesis of H2O2coupled with biomass valorization.

关键词： Atomic economy Radical pathway regulation Rubidium atom coordination Biomass valorization

Cortico-striatal gamma oscillations are modulated by dopamine D3 receptors in dyskinetic rats

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Neural Regeneration Research 2025年第4期20卷 1164-1177页

作者： Pengfei Wang Yuewei Bi min li Jiazhi chen Zhuyong Wang Huantao Wen ming Zhou minjie Luo Wangming Zhang Neurosurgery Center Department of Pediatric NeurosurgeryGuangdong Provincial Key Laboratory on Brain Function Repair and RegenerationZhujiang HospitalSouthern Medical UniversityGuangzhouGuangdong ProvinceChina

Long-term levodopa administration can lead to the development of levodopa-induced *** oscillations are a widely recognized hallmark of abnormal neural electrical activity in levodopa-induced ***,studies have reported increased oscillation power in cases of levodopa-induced ***,little is known about how the other electrophysiological parameters of gamma oscillations are altered in levodopa-induced ***,the role of the dopamine D3 receptor,which is implicated in levodopa-induced dyskinesia,in movement disorder-related changes in neural oscillations is *** found that the cortico-striatal functional connectivity of beta oscillations was enhanced in a model of Parkinson’s ***,levodopa application enhanced cortical gamma oscillations in cortico-striatal projections and cortical gamma aperiodic components,as well as bidirectional primary motor cortex(M1)↔dorsolateral striatum gamma *** of PD128907(a selective dopamine D3 receptor agonist)induced dyskinesia and excessive gamma oscillations with a bidirectional M1↔dorsolateral striatum ***,administration of PG01037(a selective dopamine D3 receptor antagonist)attenuated dyskinesia,suppressed gamma oscillations and cortical gamma aperiodic components,and decreased gamma causality in the M1→dorsolateral striatum *** findings suggest that the dopamine D3 receptor plays a role in dyskinesia-related oscillatory activity,and that it has potential as a therapeutic target for levodopa-induced dyskinesia.

关键词： aperiodic components dopamine D3 receptor dorsolateral striatum functional connectivity gamma oscillations levodopa-induced-dyskinesia local field potentials neuromodulation Parkinson’s disease primary motor cortex

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石蜡改性制人造蜂蜡

石油化工 2002年第4期31卷 283-285页

作者：杨基和李肖陈敏江苏石油化工学院化工系江苏常州213016

以固体石蜡为基本原料 ,加入一定量微晶蜡 ,在氧化剂作用下进行物理和化学改性 ,改性后的人造蜂蜡理化性能符合天然蜂蜡指标。实验室筛选及合成了催化剂 ,摸索了最佳操作条件 ,考察了反应热效应。关键是采用了酸性相转移溶剂和强氧化剂 ... 详细信息

以固体石蜡为基本原料 ,加入一定量微晶蜡 ,在氧化剂作用下进行物理和化学改性 ,改性后的人造蜂蜡理化性能符合天然蜂蜡指标。实验室筛选及合成了催化剂 ,摸索了最佳操作条件 ,考察了反应热效应。关键是采用了酸性相转移溶剂和强氧化剂 ,使产品酸值、皂化值大幅度提高 ,反应周期大大缩短。为工业化连续生产及反应器设计奠定了基础。

关键词：石蜡改性制备人造峰蜡

Cyano migration-mediated radical-polar crossover cyclopropanation

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Science China Chemistry 2025年第01期 241-248页

作者： Ziqiang Wang Yasu chen Jie li chen Zhu Key Laboratory of Organic Synthesis of Jiangsu Province College of Chemistry Chemical Engineering and Materials ScienceSoochow University Frontiers Science Center for Transformative Molecules Zhangjiang Institute for Advanced Study and Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Shanghai Jiao Tong University

We report a novel cyano migration-mediated radical-polar crossover process, whereby both the sulfonylcyanation of aliphatic alkenes and the formation of cyclopropanes are concurrently achieved. This transformation yields a diverse array of multisubstituted cyclopropanes under mild photocatalytic conditions. Mechanistic studies elucidate that the reaction proceeds via intramolecular nucleophilic substitution, leading to the formation of the cyclopropane derivatives.

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Targeting cholesterol trafficking to mitigate axonal degeneration in hereditary spastic paraplegia

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Neural Regeneration Research 2025年第5期20卷 1397-1398页

作者： Zhenyu chen Xue-Jun li Department of Biomedical Sciences University of Illinois College of Medicine RockfordRockfordILUSA Department of Bioengineering University of Illinois at ChicagoChicagoILUSA

Axonal degeneration underlies many debilitating diseases including hereditary spastic paraplegia(HSP),a genetically and clinically diverse group of disorders characterized by spasticity and weakness of the lower *** is one significant cause of chronic neurodisability due to the lack of effective treatments and a wide range of onset ages from early childhood to 70 years.

关键词： degeneration diseases hereditary

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消隙齿轮降低柴油机怠速噪声的应用研究

农业工程学报 2017年第1期33卷 63-69页

作者：李民陈烨龙庞建武杜慧勇徐斌河南科技大学车辆与交通工程学院洛阳471003 广西玉柴机器股份有限公司玉林537005

柴油机噪声影响着农业机械操作者的身心健康,该文为了解决某型柴油机在怠速工况下的异响噪声问题,采用仿真与试验相结合的方法进行研究。首先,通过声强和声压测试确定了噪声的主要产生部位;然后,基于Hypermesh和Abaqus软件建立了曲轴及... 详细信息

柴油机噪声影响着农业机械操作者的身心健康,该文为了解决某型柴油机在怠速工况下的异响噪声问题,采用仿真与试验相结合的方法进行研究。首先,通过声强和声压测试确定了噪声的主要产生部位;然后,基于Hypermesh和Abaqus软件建立了曲轴及整机零部件的有限元模型,并通过模态试验验证了有限元模型的准确性,基于Excite软件建立了配气正时传动系统和整机的多体动力学模型,发动机整机振动计算时考虑了缸内燃气压力、正时系统及配气机构全阀系激励和活塞敲击激励。多体动力学仿真结果表明:齿轮的反向敲击出现时,齿轮工作面的接触力消失,进排气齿轮在背隙侧发生接触产生冲击力,进而造成发动机在怠速时产生"哒哒"的异响噪声;整机振动仿真结果表明:使用消隙齿轮可以消除进/排气凸轮轴齿轮的反向敲击,在1 000~2 500 Hz范围内,使得齿轮室盖和缸盖罩的振动速度级降低了7 d B左右。最后在半消声室的发动机台架上,对有无消隙齿轮的柴油机进行了振动加速度、噪声和声品质的对比试验,试验表明:怠速工况下,使用消隙齿轮后,前端发出的"哒哒"异响噪声消失,齿轮室盖振动降幅很大,前端1 m噪声声压级降低了5~9 d B(A),声品质也有了明显改善。因此,当内燃机其它齿轮传动部位出现齿轮反向敲击声时,可考虑使用消隙齿轮予以解决。

关键词：柴油机振动齿轮怠速工况消隙齿轮噪声

Synthesis and Structure of a Binuclear Copper（Ⅰ） Complex [Cu2（dppm）2（i-C9H7N）Br2]（C9H7N）(C10H8)CH3CN

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Synthesis and Structure of a Binuclear Copper（Ⅰ） Complex ...

Scheme of Cooperative Spectrum Sensing Based on Adaptive Decision Fusion Algorithm

中国化学会第五届全国结构化学学术会议

作者： li-li,Zhou li-min,chen liang Yang Qiong-hua Jin (Department of Chemistry,Capital Normal University,Beijing,100037,P.R.China.

＜正＞It has been pointed out and confirmed that the four-electron-donor diphosphine ligand, bis（diphenylphosphino）methane（dppm）,is a very efficient bridging bidentate ligand,and generally speaking,complexes consi...

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Journal of Electronic Science and Technology 2012年第1期10卷 42-46页

作者： Xing-Xiong Xu,li-min Wu,and Wei chen,the Department of Communication and Information System,Air Force Radar Academy,Wuhan 430019,China The Department of Communication and Information System Air Force Radar AcademyWuhan 430019 China

Spectrum sensing is one of the core technologies for cognitive radios （CR）, where reliable detection of the signals of primary users （PUs） is precondition for implementing the CR systems. A cooperative spectrum sensing scheme based on an adaptive decision fusion algorithm for spectrum sensing in CR is proposed in this paper. This scheme can estimate the PU prior probability and the miss detection and false alarm probabilities of various secondary users （SU）, and make the local decision with the Chair-Varshney rule so that the decisions fusion can be done for the global decision. Simulation results show that the false alarm and miss detection probabilities resulted from the proposed algorithm are significantly lower than those of the single SU, and the performance of the scheme outperforms that of the cooperative detection by using the conventional decision fusion algorithms.

关键词： Cognitive radio Chair-Varshney rule,decision fusion energy detection spectrum sensing.