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双迭片压电振子的振动研究

振动与冲击 2010年第3期29卷 125-127,192页

作者：潘晓娟贺西平宋希阳陕西师范大学应用声学研究所西安710062

利用压电方程和小挠度弯振理论,推导了边界自由压电陶瓷双迭片薄板小挠度条件下弯曲振动位移的一般解及振型频率方程。由频率方程计算得到的各阶振型频率与用有限元方法计算的结果基本相符,并基本得到实验结果的验证。所得结论对边界自... 详细信息

利用压电方程和小挠度弯振理论,推导了边界自由压电陶瓷双迭片薄板小挠度条件下弯曲振动位移的一般解及振型频率方程。由频率方程计算得到的各阶振型频率与用有限元方法计算的结果基本相符,并基本得到实验结果的验证。所得结论对边界自由双迭片压电振子弯曲振动的设计提供了理论参考。

关键词：压电陶瓷双迭片频率方程

Staphylococcus aureus and biofilms:transmission, threats, and promising strategies in animal husbandry

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Journal of Animal Science and Biotechnology 2024年第4期15卷 1408-1423页

作者： Mengda song Qi Tang Yakun Ding Peng Tan Yucheng Zhang Tao Wang Chenlong Zhou Shenrui Xu Mengwei Lyu Yueyu Bai xi Ma State Key Laboratory of Animal Nutrition and Feeding College of Animal Science and TechnologyChina Agricultural UniversityBeijing 100193China Key Laboratory of Innovative Utilization of Local Cattle and Sheep Germplasm Resources(Co‑Construction by Ministry and Province) Ministry of Agriculture and Rural AffairsSchool of Agricultural SciencesZhengzhou UniversityZhengzhou 450001China

Staphylococcus aureus(S. aureus) is a common pathogenic bacterium in animal husbandry that can cause diseases such as mastitis, skin infections, arthritis, and other ailments. The formation of biofilms threatens and exacerbates S. aureus infection by allowing the bacteria to adhere to pathological areas and livestock product surfaces, thus triggering animal health crises and safety issues with livestock products. To solve this problem, in this review, we provide a brief overview of the harm caused by S. aureus and its biofilms on livestock and animal byproducts(meat and dairy products). We also describe the ways in which S. aureus spreads in animals and the threats it poses to the livestock industry. The processes and molecular mechanisms involved in biofilm formation are then explained. Finally, we discuss strategies for the removal and eradication of S. aureus and biofilms in animal husbandry, including the use of antimicrobial peptides, plant extracts, nanoparticles, phages, and antibodies. These strategies to reduce the spread of S. aureus in animal husbandry help maintain livestock health and improve productivity to ensure the ecologically sustainable development of animal husbandry and the safety of livestock products.

关键词： Animal husbandry Biofilm Mastitis Mitigation strategies Staphylococcus aureus

Probing structural and electronic properties of divalent metal Mg_(n+1) and SrMgn (n=2–12) clusters and their anions

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Chinese Physics B 2022年第1期31卷 465-471页

作者： song-Guo xi Qing-Yang Li Yan-Fei Hu Yu-Quan Yuan Ya-Ru Zhao Jun-Jie Yuan Meng-Chun Li Yu-Jie Yang School of Physics and Electronic Engineering Sichuan University of Science&EngineeringZigong 643000China Department of Applied Physics Chengdu University of TechnologyChengdu 610059China College of Physics&Optoelectronics Technology Baoji University of Arts and SciencesBaoji 721016China

Divalent metal clusters have received great attention due to the interesting size-induced nonmetal-to-metal transition and fascinating properties dependent on cluster size,shape,and *** this work,the combination of the CALYPSO code and density functional theory(DFT)optimization is employed to explore the structural properties of neutral and anionic Mg_(n+1) and SrMgn(n=2-12)*** results exhibit that as the atomic number of Mg increases,Sr atoms are more likely to replace Mg atoms located in the skeleton convex *** analyzing the binding energy,second-order energy difference and the charge transfer,it can be found the SrMg9 cluster with tower framework presents outstanding stability in a studied size ***,bonding characteristic analysis reveals that the stability of SrMg9 can be improved due to the strong s-p interaction among the atomic orbitals of Sr and Mg atoms.

关键词： SrMgn(n=2-12)clusters CALYPSO code density functional theory(DFT)optimization

Synthesis of substituted 2,3-Dihydrofurans via a Domino Michael/Hemiketalization Reaction

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Synthesis of substituted 2,3-Dihydrofurans via a Domino Mich...

中国化学会全国第十二届有机合成化学学术研讨会

作者： Liu,Meng-Meng Hua,Yuan-Zhao song,xi-xi Wang,Min-Can Chang,Jun-Biao College of Chemistry and Molecular Engineering Zhengzhou University

2,3-Dihydrofurans are important functionalized building blocks of natural and unnatural products because of their various biological activities,1] sush as aflatoxin B1 and clerodin.2]Thus,the synthesis of this kind of compounds has been long-standing challenge in organic chemistry,and considerable effort has been devoted to developing efficient and selective synthetic methods to access substituted 2,3-Dihydrofurans.3] Herein,we report a ordinary and efficient method through the Michael/Hemiketalization reaction of β,γ-Unsaturated Ketoesters and α-Hydroxyacetophenone for the synthesis of substituted 2,3-Dihydrofurans.

关键词： Biological activities Michael/Hemiketalization reaction 2,3-Dihydrofurans

A Direct Catalytic Asymmetric Michael/Hemiketalization Reaction ofβ,γ-Unsaturated α-Ketoamides with α-Hydroxyacetophenone

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A Direct Catalytic Asymmetric Michael/Hemiketalization React...

手性中国2014学术研讨会

作者： Yuan-Zhao Hua De-Zhi Kong xi-xi song Min-Can Wang Jun-Biao Chang College of Chemistry and Molecular Engineering Zhengzhou University

＜正＞The catalytic asymmetric Michael reaction is one of the most important carbon-carbon bond formation ***,β,γ-unsaturated a-ketoamides as a new class of Michael acceptors were less studied than the corresponding ester and phosphonate.[1]And the direct catalytic asymmetric Michael reaction ofα-hydroxyacetophenone as donors to β,γ-unsaturated a-ketoamides has not been *** this end,we report our dinuclear Zinc Catalyst 1 prepared in situ,which controls the addition of

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Direct Catalytic Asymmetric Michael/hemiketalization Reaction of β,γ-Unsaturated α-Ketoesters with α-Hydroxyacetophenone

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Direct Catalytic Asymmetric Michael/hemiketalization Reactio...

手性中国2014学术研讨会

作者： Meng-Meng Liu Pei-Jin Huang Yuan-Zhao Hua xi-xi song Min-Can Wang College of Chemistry and Molecular Engineering Zhengzhou University

The catalytic asymmetric Michael reaction ofβ,γ-unsaturated a-ketoesters is a powerful and versatile carbon-carbon bond-forming process in organic synthesis.[1]In 2013,we reported a Michael/hemiketalization reaction of a-hydroxyacetophenone toβ,γ-unsaturated a-ketoesters with excellent enantioselectivities catalyzed by our dinuclear Zinc catalyst L.[2]What’s more,this catalyst was more effective than Trost’s dinuclear zinc catalysts in asymmetric alternating copolymerization of carbon

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共生节点联盟下中小企业路径选择研究

物流技术 2012年第12期31卷 37-40页

作者：宋茜茜北京物资学院北京101149

在供应链协同理论的相关研究基础上,把共生理论引入到中小企业供应链协同分析中。中小企业在整个供应链协同过程中存在一定的劣势与复杂性。通过共生理论对中小企业供应链协同路径选择的动因及方式分析,提出形成"共生节点联盟"的中小企... 详细信息

在供应链协同理论的相关研究基础上,把共生理论引入到中小企业供应链协同分析中。中小企业在整个供应链协同过程中存在一定的劣势与复杂性。通过共生理论对中小企业供应链协同路径选择的动因及方式分析,提出形成"共生节点联盟"的中小企业供应链协同路径方式,并通过对"共生节点联盟"利益分配的分析,完善中小企业供应链协同的路径选择研究。

关键词：供应链协同共生节点联盟中小企业路径选择

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生猪散养模式的利弊分析与趋势预测

中国畜牧杂志 2007年第18期43卷 17-20页

作者：宋连喜辽宁农业职业技术学院辽宁营口115009

当前,我国生猪饲养模式仍以农户散养为主,养猪业依然是中国农民收入的一个重要来源。本文详细分析了我国生猪散养的优势与存在的问题,并对其发展趋势进行了预测,以独特的视角阐述了当前农户散养生猪的合理性与必要性。

关键词：生猪散养模式优势问题发展趋势

Spatial Signature Estimation in Cumulant Domain and Application to Smart Antenna System

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Spatial Signature Estimation in Cumulant Domain and Applicat...

第七届国际信号处理会议

作者： WeiminJIA Minli YAO Jianshe song (xi’an Research Institute of High Technology Hongqing Baqiao xi’an Shaanxi 710025 China)

In this paper, we propose a subspace-based spatial signature estimation algorithm of cochannel multiuser signals by exploiting cumulant, and apply it to multiuser signal copy in uplink SDMA (space-div

关键词： smart antenna system SDMA spatial signature