检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

预应力自平衡索桁架的非线性固有振动

中南大学学报（自然科学版） 2011年第4期42卷 1111-1116页

作者：杨立军叶柏龙喻爱南吴晓湖南文理学院土木建筑工程学院湖南常德415000 中南大学土木建筑学院湖南长沙410083

研究预应力自平衡索桁架的非线性固有振动。考虑温度变化及几何非线性影响,采用连续化理论导出点支式玻璃幕墙预应力自平衡索桁架支承体系非线性振动方程。通过Galerkin方法,将偏微分程转化为常微分方程,采用L-P法对常微分方程进行求解... 详细信息

研究预应力自平衡索桁架的非线性固有振动。考虑温度变化及几何非线性影响,采用连续化理论导出点支式玻璃幕墙预应力自平衡索桁架支承体系非线性振动方程。通过Galerkin方法,将偏微分程转化为常微分方程,采用L-P法对常微分方程进行求解。结合工程实例讨论分析温度变化、振幅、初始张力、矢高等因素对点支式玻璃幕墙预应力自平衡索桁架支承体系非线性振动的影响。算例结果表明:预应力自平衡索桁架支承体系固有频率随着温度的升高而减小,具有较强的非线性,其固有振动频率随着振幅发生变化,其非线性振动呈现"硬弹簧"特性,非线性振动频率高于线性振动频率。

关键词：预应力自平衡索桁架点支式玻璃幕墙非线性固有振动

De novo synthesis of atropisomeric benzofurans via Cu/SPDO complex catalyzed asymmetric formal [3 + 2] annulation

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期68卷 174-180页

作者： Fan-Xiao Meng Xing-yu Wang Ka Lu Ju-Song Yang Fu-Min Zhang ai-Jun Ma Bao Du Yong-Qiang Tu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University School of Chemistry and Chemical Engineering Shanghai Jiao Tong University School of Biotechnology and Health Sciences Wuyi University

Herein, the de novo synthesis of atropisomeric benzofurans through the Cu/spirocyclic-pyrrolidine-oxazoline(SPDO) complex catalyze asymmetric formal [3 + 2] cycloaddition between quinones and ynamides is explored, producing a range of structurally diverse axially chiral benzofurans in satisfactory yields with good to excellent enantioselectivities. Furthermore, density functional theory calculations were applied to explain the possible reaction mechanism.

关键词： benzofuran atropisomers novel de novo synthetic strategy asymmetric formal [3 + 2] cycladdition Cu/SPDO complex DFT calculations

Hypoxia-preconditioned bone marrow-derived mesenchymal stem cells protect neurons from cardiac arrest-induced pyroptosis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第4期20卷 1103-1123页

作者： Xiahong Tang nan Zheng Qingming Lin Yan You Zheng Gong Yangping Zhuang Jiali Wu yu Wang Hanlin Huang Jun Ke Feng Chen Shengli Clinical Medical College of Fujian Medical University Fujian Medical UniversityFuzhouFujian ProvinceChina Department of Emergency Fujian Provincial HospitalFuzhouFujian ProvinceChina Fujian Provincial Key Laboratory of Emergency Medicine FuzhouFujian ProvinceChina The Second Department of Intensive Care Unit Fujian Provincial Hospital South BranchFuzhouFujian ProvinceChina

Cardiac arrest can lead to severe neurological impairment as a result of inflammation,mitochondrial dysfunction,and post-cardiopulmonary resuscitation neurological *** preconditioning has been shown to improve migration and survival of bone marrow–derived mesenchymal stem cells and reduce pyroptosis after cardiac arrest,but the specific mechanisms by which hypoxia-preconditioned bone marrow–derived mesenchymal stem cells protect against brain injury after cardiac arrest are *** this end,we established an in vitro co-culture model of bone marrow–derived mesenchymal stem cells and oxygen–glucose deprived primary neurons and found that hypoxic preconditioning enhanced the protective effect of bone marrow stromal stem cells against neuronal pyroptosis,possibly through inhibition of the MAPK and nuclear factor κB ***,we transplanted hypoxia-preconditioned bone marrow–derived mesenchymal stem cells into the lateral ventricle after the return of spontaneous circulation in an 8-minute cardiac arrest rat model induced by *** results showed that hypoxia-preconditioned bone marrow–derived mesenchymal stem cells significantly reduced cardiac arrest–induced neuronal pyroptosis,oxidative stress,and mitochondrial damage,whereas knockdown of the liver isoform of phosphofructokinase in bone marrow–derived mesenchymal stem cells inhibited these *** conclude,hypoxia-preconditioned bone marrow–derived mesenchymal stem cells offer a promising therapeutic approach for neuronal injury following cardiac arrest,and their beneficial effects are potentially associated with increased expression of the liver isoform of phosphofructokinase following hypoxic preconditioning.

关键词： bone marrow–derived mesenchymal stem cells cardiac arrest cardiac resuscitation hypoxic preconditioning liver isoform of phosphofructokinase mitochondria neuroinflammation oxidative stress pyroptosis reactive oxygen species

Day-ahead Electricity Price Prediction Method Based on Similar Day Screening and Combined Deep Learning Modeling

在线全文

学校读者我要写书评

暂无评论

Dianwang Jishu/Power System Technology 2025年第1期49卷 242-251页

作者： ai, yu Jia, Yanbing Han, Xiaoqing Shanxi Key Laboratory of Power System Operation and Control Taiyuan University of Technology Shanxi Province Taiyuan 030024 China Key Laboratory of Cleaner Intelligent Control on Coal & Electricity Taiyuan University of Technology Ministry of Education Shanxi Province Taiyuan 030024 China

Accurate day-ahead electricity price prediction is the basis for market operation and policy planning, while market disclosure information is essential for electricity price prediction. This paper proposes a combined CNN-GRU deep-learning electricity price prediction model introducing the Self-attention mechanism. Firstly, for the trading process of the Shanxi electricity spot market and the formation mechanism of electricity price before the day, it is proposed to adopt the maximum mutual information coefficient method to extract features from the market disclosed information data such as boundary conditions before the day, to determine the key influencing factors of electricity price and its weight coefficients;and then based on the weighted grey correlation of the history of similar day screening method to generate the historical dataset of electricity price prediction, and to excavate the internal change rule of electricity price and its features;Finally, the CNN-GRU model introducing Self-attention mechanism is used to get the predicted electricity price based on the historical data set. The effectiveness and accuracy of the prediction method proposed in this paper are verified through examples. © 2025 Power System Technology Press. All rights reserved.

关键词：

Primary culture of basolateral amygdala neurons of newborn rat

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Primary culture of basolateral amygdala neurons of newborn r...

Recent progress on photoactive nonprecious transition-metal complexes

中国神经科学学会第四次会员代表大会暨第七届全国学术会议

作者： Xin-Qiu LIU,Zhi-Hua yu,ai-Hua QIAN,nan MA,He-Zuo LV,Ying LI,Pei-Hua LU Department of Neurobiology,Shanghai Jiaotong University School of Medicine,280 South Chong-Qing Road,Shanghai 200025,PR China

＜正＞The basolateral amygdala is a brain region with critical roles in emotional control and fear *** understand the basolateral amygdala physiology and pathology,it is important to study its synaptic transmission and ***,technical difficulties exist in dissecting basolateral amygdala *** overcome this problem,we have developed a novel dissection procedure in which we can gain the basolateral amygdala ***,we describe a reliable method to prepare primary cultures of P0 rat basolateral amygdala *** of cultures can take as little as 2 *** can be maintained for as long as 2 *** neurons survived better and showed healthy ***, the present study suggest that primary culture of the basolateral amygdala neurons is a powerful tool to study neuronal synaptic transmission and modulation.

关键词： cell culture the basolateral amygdala neurons

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期68卷 46-95页

作者： Zhong-Liang Gong Hong-Jie Zhang Yan Cheng Jianxun Liu yuhan ai Yaqin Li Zhihui Feng Qiong Zhang Shaolong Gong Yong Chen Chang-Jiang Yao yuan-yuan Zhu Liang-Jin Xu yu-Wu Zhong CAS Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences State Key Laboratory of Structural Cemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences School of Chemistry and Chemical Engineering Anhui Key Laboratory of Advanced Catalytic Materials and Reaction EngineeringHefei University of Technology State Key Laboratory of Explosion Science and Safety Protection School of Mechatronical Engineering Beijing Institute of Technology College of Chemistry and Molecular Sciences Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Wuhan University School of Chemistry and Chemical Engineering Anhui University Key Laboratory of Photochemical Conversion and Optoelectronic Materials & CAS-HKU Joint Laboratory on New Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences

Photoactive complexes of nonprecious transition metals, mainly including those in the first-row and partially the second-row of the Periodic table of elements, have received increasing attention in view of their low cost and long-term sustainability. They are recognized as promising alternatives to noble transition metal complex congeners that have been extensively studied in optoelectronic devices, artificial photosynthesis, photocatalysis, biodiagnostics, and therapeutics, etc. This review is devoted to a comprehensive summary on the classical and recent advances on photoactive nonprecious transition metal complexes, including photoactive Zr, V, Cr, Mo, and W complexes, Mn complexes and hybrids, Fe, Co, Ni, and Cu complexes, and Zn and Cd complexes and hybrids. A particular focus is given on the molecular design, modulation of photophysical and photochemical properties, and applications of the representative and lately-developed nonprecious metal complexes. In addition, a perspective on the future development in this field is provided at the end of this review.

关键词： photoactive metal complexes earth-abundant metals nonprecious metal complexes luminescence photochemistry

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

考虑温度变化的单层索网幕墙结构固有振动

河南科技大学学报（自然科学版） 2010年第6期31卷 58-61页

作者：杨立军吴晓叶柏龙喻爱南湖南文理学院土木建筑工程学院湖南常德415000 中南大学土木建筑学院湖南长沙410083

为研究单层索网幕墙结构固有振动特性,考虑温度变化及几何非线性影响,采用连续化理论导出了单层索网幕墙结构非线性振动方程。利用Galerkin方法及L-P法求出了单层索网幕墙结构固有振动的近似解,并讨论分析了温度的改变量、振幅、初始拉... 详细信息

为研究单层索网幕墙结构固有振动特性,考虑温度变化及几何非线性影响,采用连续化理论导出了单层索网幕墙结构非线性振动方程。利用Galerkin方法及L-P法求出了单层索网幕墙结构固有振动的近似解,并讨论分析了温度的改变量、振幅、初始拉力对单层索网幕墙结构固有振动的影响。算例表明:随着温度的降低,振幅、初始拉力的增大,单层索网幕墙结构振动频率将变大。

关键词：单层索网点支式玻璃幕墙固有振动温度变化振动频率

在线全文

学校读者我要写书评

暂无评论

硅酮结构胶使用方法的探讨

山西建筑 2006年第8期32卷 1-2页

作者：叶柏龙陈宾喻爱南中南大学土木建筑学院

结合幕墙施工的工作经验,介绍了幕墙基材的表面清洁工作的几个施工要点,阐述了经常忽视的几个用胶误区,并阐明了在用胶过程中需要注意的问题,保证硅酮结构密封胶的作用。

关键词：清洁材料密封胶固化时间

Silk damping in scalar-induced gravitational waves: a novel probe for new physics

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 79-85页

作者： Yan-Heng yu Sai Wang Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences

Silk damping is well known in the study of cosmic microwave background（CMB） and accounts for suppression of the angular power spectrum of CMB on large angular multipoles. In this article, we study the effect of Silk damping on the scalar-induced gravitational waves（SIGWs）. Resulting from the dissipation of cosmic fluid, the Silk damping notably suppresses the energydensity spectrum of SIGWs on scales comparable to a diffusion scale at the decoupling time of weakly-interacting particles. The effect offers a novel observable for probing the underlying particle interaction, especially for those mediated by heavy gauge bosons beyond the standard model of particles. We anticipate that pulsar timing arrays are sensitive to gauge bosons with mass ～10～3-10～4 GeV, while space-and ground-based interferometers to those with mass ～10～7-1012GeV, leading to essential complements to on-going and future experiments of high-energy physics.

关键词： scalar-induced gravitational waves Silk damping new physics