检索结果-南通市图书馆

A one-step procedure for facile, selective synthesis of protected d-glucopyranosides with free 2-C hydroxyl group starting from peracetylated β-D-glucopyranose

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1996年第2期14卷 190-192页

作者： liu,Mei-zheng fan,Hong-Ni GUO,Zhong-Wu HUI,Yong-zhengNational Laboratory of Bio-Organic and Natural Product Chemistry,Shanghai Institute of Organic Chemistry,Chinese Academy of Sciences,Shanghai 200033,China National Laboratory of Bio‐Organic and Natural Product Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

An important field in carbohydrate chemistry is to look for regioselective re-actions of saccharides to simplify the chemical synthesis of oligosaccharides. Oneof such efforts nowadays is directed to the convenient pr... 详细信息

关键词： One-step reaction protected D-glucopyranosides with free 2-hydroxyl group

Phosphosilicate glass film for optical waveguide by sol-gel method

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2005年第2期1卷 121-123页

作者： SHEN Jian LI Ai-wu zheng Jie ZHANG Le-tian liu Guo-fan zheng Wei ZHANG Yu-shu National Integrated Optoelectronics Lab. Dept. of Electronics Eng. Jilin University Changchun 130012 China

In this paper, silica-on-silicon erbium-doped phosphosilicate glass film material was fabricated for optical waveguides by sol-gel method. Samples were characterized and analyzed. It is demonstrated that we have got well-distributed, good translucent, alterable thickness of film and glass state erbium-doped phosphosilicate films material for optical waveguides by sol-gel method.

关键词：磷硅酸盐玻璃薄膜光学波导生物材料

Rational modulation of fluorophosphate cathode by anionic groups to reduce the polarization behavior for fast-charging sodium-ion batteries

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 509-521页

作者： Xinyuan Wang fan Zhang Xingyu Zhou Qian Wang Changyu liu Yangyang liu Hui Wang Xiaojie liu Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials Science Northwest University

Na3V2（PO4）2O2F （VP） is recognized as a promising cathode material for sodium-ion batteries due to its stable structural framework and high specific *** functional theory （DFT） and finite element simulations show that incorporating SO42-into VP decreases its band gap,lowers the migration energy barrier,and ensures a uniform Na+concentration gradient and stress distribution during charge and discharge ***,the average Na+diffusion coefficient of Na3V2（PO4）1.95（SO4）0.05O2F（VPS-1） is roughly double that of VP,leading to enhanced rate capability (80 C,75.5 mAh g-1) and cycling stability (111.0 mAh g-1capacity after 1000 cycles at 10 C current density) for ***-1 exhibits outstanding fast-charging capabilities,achieving an 80%state of charge in just 8.1 *** assembled VPS-1//SbSn/NPC full cell demonstrated stable cycling over 200 cycles at a high 5 C current,maintaining an average coulombic efficiency of 95.35%.

关键词： Anionic group modulation Polarization behavior Fast-charging Sodium-ion battery Fluorophosphate Cathode

The role of axon guidance molecules in the pathogenesis of epilepsy

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5期20卷 1244-1257页

作者： zheng liu Chunhua Pan Hao Huang Department of Neurology Affiliated Hospital of Zunyi Medical UniversityZunyiGuizhou ProvinceChina

Current treatments for epilepsy can only manage the symptoms of the condition but cannot alter the initial onset or halt the progression of the disease. Consequently, it is crucial to identify drugs that can target novel cellular and molecular mechanisms and mechanisms of action. Increasing evidence suggests that axon guidance molecules play a role in the structural and functional modifications of neural networks and that the dysregulation of these molecules is associated with epilepsy susceptibility. In this review, we discuss the essential role of axon guidance molecules in neuronal activity in patients with epilepsy as well as the impact of these molecules on synaptic plasticity and brain tissue remodeling. Furthermore, we examine the relationship between axon guidance molecules and neuroinflammation, as well as the structural changes in specific brain regions that contribute to the development of epilepsy. Ample evidence indicates that axon guidance molecules, including semaphorins and ephrins, play a fundamental role in guiding axon growth and the establishment of synaptic connections. Deviations in their expression or function can disrupt neuronal connections, ultimately leading to epileptic seizures. The remodeling of neural networks is a significant characteristic of epilepsy, with axon guidance molecules playing a role in the dynamic reorganization of neural circuits. This, in turn, affects synapse formation and elimination. Dysregulation of these molecules can upset the delicate balance between excitation and inhibition within a neural network, thereby increasing the risk of overexcitation and the development of epilepsy. Inflammatory signals can regulate the expression and function of axon guidance molecules, thus influencing axonal growth, axon orientation, and synaptic plasticity. The dysregulation of neuroinflammation can intensify neuronal dysfunction and contribute to the occurrence of epilepsy. This review delves into the mechanisms associated with

关键词： axon guidance drug-resistant epilepsy epilepsy nerve regeneration nervous system diseases neural pathways neuroinflammatory diseases neuronal plasticity neurons synaptic remodeling

Mechanism by which Rab5 promotes regeneration and functional recovery of zebrafish Mauthner axons

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第6期20卷 1816-1824页

作者： Jiantao Cui Yueru Shen zheng Song Dinggang fan Bing Hu Center for Advanced Interdisciplinary Science and Biomedicine of IHM Division of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui ProvinceChina

Rab5 is a GTPase protein that is involved in intracellular membrane trafficking. It functions by binding to various effector proteins and regulating cellular responses, including the formation of transport vesicles and their fusion with the cellular membrane. Rab5 has been reported to play an important role in the development of the zebrafish embryo;however, its role in axonal regeneration in the central nervous system remains unclear. In this study, we established a zebrafish Mauthner cell model of axonal injury using single-cell electroporation and two-photon axotomy techniques. We found that overexpression of Rab5 in single Mauthner cells promoted marked axonal regeneration and increased the number of intra-axonal transport vesicles. In contrast, treatment of zebrafish larvae with the Rab kinase inhibitor CID-1067700markedly inhibited axonal regeneration in Mauthner cells. We also found that Rab5 activated phosphatidylinositol 3-kinase(PI3K) during axonal repair of Mauthner cells and promoted the recovery of zebrafish locomotor function. Additionally, rapamycin, an inhibitor of the mechanistic target of rapamycin downstream of PI3K, markedly hindered axonal regeneration. These findings suggest that Rab5 promotes the axonal regeneration of injured zebrafish Mauthner cells by activating the PI3K signaling pathway.

关键词： axonal regeneration Mauthner cell nerve regeneration Rab5 zebrafish

拟蒙特卡罗粒子滤波改进算法及其在雷达目标跟踪中的应用

在线全文

学校读者我要写书评

暂无评论

应用科学学报 2012年第6期30卷 607-612页

作者：陈志敏薄煜明吴盘龙刘正凡南京理工大学自动化学院南京210094

拟蒙特卡罗粒子滤波算法(quasi-Monte-Carlo particle filter,QMC-PF)精度不高,运算复杂度大,难以满足雷达机动目标跟踪精确性和实时性需求.为此,提出一种基于BP神经网络的新型拟蒙特卡罗粒子滤波算法.该算法将大权重粒子通过QMC分裂采... 详细信息

拟蒙特卡罗粒子滤波算法(quasi-Monte-Carlo particle filter,QMC-PF)精度不高,运算复杂度大,难以满足雷达机动目标跟踪精确性和实时性需求.为此,提出一种基于BP神经网络的新型拟蒙特卡罗粒子滤波算法.该算法将大权重粒子通过QMC分裂采样产生低差异性的子代粒子,以此来替代低权重粒子,保证了样本的有效性和多样性;同时利用BP神经网络计算子代粒子的权重,提高了滤波的精度和速度;最后在不同的模型中进行仿真.实验结果表明,与QMC-PF相比,所提出的算法提高了精度和运算速度,适用于雷达机动目标的跟踪.

关键词：粒子滤波拟蒙特卡罗神经网络目标跟踪闪烁噪声

在线全文

学校读者我要写书评

暂无评论

高速集成电路电源网络的电容参数提取

上海交通大学学报 2004年第5期38卷 747-750页

作者：刘烨李征帆上海交通大学电子工程系上海200030

提出一种基于矩量法的加速计算均匀介质中高速集成电路电源网络分布电容参数的方法.利用电源网络中电源线与地线交替分布且具有一定周期性的特点,引入周期单元,通过在适当的位置添加电壁和磁壁,可以显著减小求解空间.单元的格林函数解... 详细信息

提出一种基于矩量法的加速计算均匀介质中高速集成电路电源网络分布电容参数的方法.利用电源网络中电源线与地线交替分布且具有一定周期性的特点,引入周期单元,通过在适当的位置添加电壁和磁壁,可以显著减小求解空间.单元的格林函数解具有无穷级数的形式,收敛缓慢,采用Pade逼近对其进行加速.计算结果表明,该方法有效提高了电源网络电容参数的提取效率,且具有较高的精度.

关键词：高速数字集成电路电源网络分布电容参数提取

Multi boron-doping effects in hard carbon toward enhanced sodium ion storage

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 730-738页

作者： Peng zheng Wang Zhou Ying Mo Biao zheng Miaomiao Han Qin Zhong Wenwen Yang Peng Gao Lezhi Yang Jilei liu College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Greater Bay Area Institute for Innovation Hunan University Changsha Research Institute of Mining & Metallurgy Co. LTD.

Hard carbon （HC） has been considered as promising anode material for sodium-ion batteries （SIBs）.The optimization of hard carbon’s microstructure and solid electrolyte interface （SEI） property are demonstrated effective in enhancing the Na+storage capability,however,a one-step regulation strategy to achieve simultaneous multi-scale structures optimization is highly ***,we have systematically investigated the effects of boron doping on hard carbon’s microstructure and interface chemistry.A variety of structure characterizations show that appropriate amount of boron doping can increase the size of closed pores via rearrangement of carbon layers with improved graphitization degree,which provides more Na+storage ***-situ Fourier transform infrared spectroscopy/electrochemical impedance spectroscopy （FTIR/EIS） and X-ray photoelectron spectroscopy （XPS） analysis demonstrate the presence of more BC3and less B–C–O structures that result in enhanced ion diffusion kinetics and the formation of inorganic rich and robust SEI,which leads to facilitated charge transfer and excellent rate *** a result,the hard carbon anode with optimized boron doping content exhibits enhanced rate and cycling *** general,this work unravels the critical role of boron doping in optimizing the pore structure,interface chemistry and diffusion kinetics of hard carbon,which enables rational design of sodium-ion battery anode with enhanced Na+storage performance.

关键词： X ray photoelectron spectroscopy

不确定切换时滞非线性系统状态切换的指数稳定性

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

控制与决策 2014年第12期29卷 2247-2252页

作者：刘正凡蔡晨晓段文勇邹云南京理工大学自动化学院南京210094

利用状态依赖控制策略对切换信号进行设计,使得一类参数不确定时滞非线性切换系统指数稳定且具有一定的H∞抗干扰性能.利用Lyapunov-Krasovskii(LK)函数方法,以线性矩阵不等式组的方式,给出了稳定切换律存在的充分条件,并且该系统是指... 详细信息

利用状态依赖控制策略对切换信号进行设计,使得一类参数不确定时滞非线性切换系统指数稳定且具有一定的H∞抗干扰性能.利用Lyapunov-Krasovskii(LK)函数方法,以线性矩阵不等式组的方式,给出了稳定切换律存在的充分条件,并且该系统是指数稳定的.通过引入自由矩阵并结合积分不等式技巧,得到了保守性较低的稳定性条件.仿真算例表明了所提出方法的有效性和较低的保守性.

关键词：指数稳定非线性切换系统不确定时变时滞切换信号