检索结果-南通市图书馆

Chinese Journal of Chemistry 2014年第2期32卷 128-132页

作者： mingguang pan Min Xue Department of Chemistry Zhejiang UniversityHangzhouZhejiang 310027China

By the introduction of methoxycarbonyl-methoxy groups and hydroxyl groups into a pillar structure,a pillararene entirely with two types of functional groups was successfully prepared,which can form a stable 1∶1 compl... 详细信息

关键词： pillararenes functionalization bis(imidazolium) host-guest complexation self-assembly

Evidence for a Bulky Unit of a Pillar[5]arene Flipping in the Solid State

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 2014年第5期32卷 391-395页

作者： mingguang pan Min Xue Department of Chemistry Zhejiang UniversityHangzhouZhejiang 310027China

It is well known that pillar[5]arenes have two most stable conformations(pS and pR)in their crystal *** of the intramolecular H-bonding interactions,substituents,temperature,solvent and so on,the rotational behaviors of the phenolic units on pillararenes are also *** paper showed some other kinds of conforma-tions in the functionalized pillar[5]arenes and gave evidence for a bulky unit(1,4-methoxycarbonylmethoxybenzene unit)flipping in the solid *** presence of hydrogen bonding facilitated the intermolecular self-assembly in terms of energy-minimized packing in the ***,the main driving force for the flipping of this bulky unit might be both the intramolecular hydrogen bonding between the phenolic units on pillararenes and quadrupolar hy-drogen bonding between the host and *** paper helps us to have a better understanding on the conforma-tions of pillar[5]arenes.

关键词： pillararenes conformation hydrogen bonding hydroquinone 1,4-methoxycarbonylmethoxybenzene

Development of organic redox-active materials in aqueous flow batteries: Current strategies and future perspectives

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

SmartMat 2023年第4期4卷 85-104页

作者： mingguang pan Minhua Shao Zhong Jin State Key Laboratory of Coordination Chemistry MOE Key Laboratory of Mesoscopic ChemistryMOE Key Laboratory of High Performance Polymer Materials and TechnologyJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjingChina Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyHong KongChina

Aqueous redox flow batteries,by using redox-active molecules dissolved in nonflammable water solutions as electrolytes,are a promising technology for grid-scale energy *** redox-active materials offer a new opportunity for the construction of advanced flow batteries due to their advantages of potentially low cost,extensive structural diversity,tunable electrochemical properties,and high natural *** this review,we present the emergence and development of organic redox-active materials for aqueous organic redox flow batteries(AORFBs),in particular,molecular engineering concepts and strategies of organic redox-active *** typical design strategies based on organic redox species for high-capacity,high-stability,and high-voltage AORFBs are outlined and *** engineering of organic redox-active molecules for high aqueous solubility,high chemical/electrochemical stability,and multiple electron numbers as well as satisfactory redox potential gap between the redox pair is essential to realizing high-performance *** molecular engineering,the redoxtargeting strategy is an effective way to obtain high-capacity *** further discuss and analyze the redox reaction mechanisms of organic redox species based on a series of electrochemical and spectroscopic approaches,and succinctly summarize the capacity degradation mechanisms of ***,the current challenges,opportunities,and future directions of organic redox-active materials for AORFBs are presented in detail.

关键词： aqueous redox flow batteries grid energy storage molecular engineering strategies organic redox-active materials redox reaction mechanisms

A Solvent-Driven Molecular Spring

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

A Solvent-Driven Molecular Spring

偶氮苯基型离子液体溶液对空气中湿度的变色响应（英文）

全国第十六届大环化学暨第八届超分子化学学术讨论会

作者： Zibin Zhang mingguang pan Feihe Huang Department of Chemistry Zhejiang University

＜正＞A solvent-driven doubly threaded rotaxane dimer based on an amino-modified copillar[5]arene was prepared using bis（trifluoromethyl）phenyl isocyanate as *** mimic the unique spring-like function of biological systems,we prepared the molecular spring 3 and control compound 5（Scheme 1）.We can control the length of this molecule continuously just by changing the solvent polarity（Fig i）.

关键词： pillararenes molecular spring host-guest chemistry self-assembly

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

物理化学学报 2019年第6期35卷 624-629页

作者：潘明光赵永升曾小勤邹建新上海交通大学材料科学与工程学院轻合金精密成型国家工程研究中心金属基复合材料国家重点实验室上海200240 上海交通大学微纳电子学系上海200240

室温离子液体对空气湿度发生比色响应,在现有的文献中鲜有报道。本论文主要报道偶氮苯酚型离子液体溶液可自发地发生明显的颜色变化,这主要是由于偶氮苯酚阴离子与水分子形成氢键的缘故。该工作通过借助核磁共振技术、紫外-可见吸收光... 详细信息

室温离子液体对空气湿度发生比色响应,在现有的文献中鲜有报道。本论文主要报道偶氮苯酚型离子液体溶液可自发地发生明显的颜色变化,这主要是由于偶氮苯酚阴离子与水分子形成氢键的缘故。该工作通过借助核磁共振技术、紫外-可见吸收光谱、实验结果及理论计算对其中的机理进行了深入的分析。具体地说,由紫外-可见吸收光谱可知,随着时间的推移,离子液体溶液在455 nm左右的吸收峰强度逐渐降低,同时在343 nm左右的吸收峰强度逐渐增强,并伴有由橙红色向浅黄色的颜色转变。这一自响应的现象也可以从核磁共振光谱中观测到。当溶液放置时间足够长时,偶氮苯酚阴离子的氢谱出峰全部向低场发生位移,且在高场处没有新峰产生。所以,很容易将刺激源锁定在空气中的气体比如弱酸性的二氧化碳以及湿度上。由此,我们向溶液中通入二氧化碳气体,溶液可从橙红色变为浅橙红色,但却不能进一步变为浅黄色,从而排除了二氧化碳的可能性。反之,我们却发现,向溶液(乙腈作溶剂)中逐渐加入少量的水,在474nm的吸收峰强度逐渐减弱,且在347 nm处的吸收峰强度逐渐增强,并伴随由橙红色向浅黄色的颜色变化,这与氯仿、四氯化碳溶液自发过程中产生的颜色变化几乎一致。并且,将两只装有离子液体溶液的比色皿分别放置在相对湿度为28%和100%的条件下,发现在较低的相对湿度下,溶液需要比在高湿度下长得多的时间实现整个的颜色转变,这表明湿度是引起溶液发生自发颜色变化最可能的刺激源。由高斯09软件计算(在B3LYP/6-31++G(p,d)水平)可知,偶氮苯酚阴离子的氧原子和水分子的氢原子之间的距离为0.174nm,相应的键角为171.12°;同时,偶氮苯酚阴离子中的氧原子与水发生作用后,氧原子的ADCH电荷由原来的-0.52变为-0.62。进一步地,由约化密度梯度分析可知,在-0.04 a.u.左右出现尖头可归属于O···H―O氢键。所有以上数据表明,空气中湿度是通过以与离子液体的阴离子形成氢键的方式,诱使离子液体溶液对其发生响应并伴随着肉眼可见的颜色变化。据我们所知,这是首次发现离子液体溶液可以对空气中湿度发生变色响应。我们希望这个工作可以加深对一些貌似反常现象背后科学道理的理解。

关键词：刺激响应湿度比色变化氢键离子液体溶液

维普期刊数据库

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

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 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

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

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

免疫原理驱动的入侵检测系统框架

计算机工程与应用 2003年第10期39卷 141-143页

作者：刘礼加欧阳明光潘峰张勇汪为农上海交通大学计算机科学与工程系上海200030

将人体免疫原理应用于计算机安全领域是安全技术研究的一次新的尝试。免疫系统捍卫着人体的生存,正如入侵检测系统(IDS,IntrusionDetectionSystem)保护计算机系统免受攻击的摧毁。当前大多数IDS系统仅采用基于特征的检测以减少误报,然... 详细信息

将人体免疫原理应用于计算机安全领域是安全技术研究的一次新的尝试。免疫系统捍卫着人体的生存,正如入侵检测系统(IDS,IntrusionDetectionSystem)保护计算机系统免受攻击的摧毁。当前大多数IDS系统仅采用基于特征的检测以减少误报,然而这会造成不可忍受的漏报问题。论文将免疫原理引入入侵检测领域,试图为当前入侵检测领域普遍存在的误报、漏报问题提出一种解决方案,并提出一种分布式、轻量级和自组织的入侵检测系统框架。

关键词：免疫原理入侵检测系统计算机网络网络安全计算机安全

维普期刊数据库

Co-production of hydrogen, oxygen, and electricity via an integrated solar-driven system with decoupled water electrolyzer and Na-Zn ion battery

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 621-627页

作者： Fei Lv Longjie Liu Jiazhe Wu Pengfei Wang Lixia pan Dengwei Jing Yubin Chen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Combining water electrolysis and rechargeable battery technologies into a single system holds great promise for the co-production of hydrogen （H2） and ***,the design and development of such systems is still in its ***,an integrated hydrogen-oxygen （O2）-electricity co-production system featuring a bipolar membrane-assisted decoupled electrolyzer and a Na-Zn ion battery was established with sodium nickelhexacyanoferrate （NaNiHCF） and Zn2+/Zn as dual redox *** decoupled electrolyzer enables to produce H2and O2in different time and space with almost 100%Faradaic efficiency at 100 mA ***,the charged NaNiHCF and Zn electrodes after the electrolysis processes formed a Na-Zn ion battery,which can generate electricity with an average cell voltage of 1.75 V at 10 m A *** connecting Si photovoltaics with the modular electrochemical device,a well-matched solar driven system was built to convert the intermittent solar energy into hydrogen and electric energy with a solar to hydrogen-electricity efficiency of 16.7%,demonstrating the flexible storage and conversion of renewables.

关键词： Hydrogen Electricity Decoupled water electrolyzer Na-Zn ion battery Solar energy

Sky location of massive black hole binaries in the foreground of Galactic white dwarf binaries

在线全文

同方期刊数据库

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 97-108页

作者： pan Guo Hong-Bo Jin Cong-Feng Qiao Yue-Liang Wu The International Centre for Theoretical Physics Asia-Pacific University of Chinese Academy of Sciences The School of Physical Sciences University of Chinese Academy of Sciences Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University National Astronomical Observatories Chinese Academy of Sciences Institute of Theoretical Physics Chinese Academy of Sciences

For space-based gravitational wave （GW） detection,the main noise source for massive black hole binaries （MBHBs） is attributed to approximately 10～7double white dwarf binaries in the *** a GW source,the amplitude of the detector response,recorded by a space-based gravitational wave detector,exhibits a modulation effect with a year period when observing the source from various orbital *** the adverse conditions mentioned above,where there is a strong foreground noise and annual modulation in the signals,we employed the wavelet transform and the strong-amplitude relevant orbital position search methods,which allows the weak MBHB sources to achieve higher locating *** detail,for two MBHB sources of lower intensity,the precision of luminosity distance,represented by the ratio ?DL/DLat the 95%confidence level,is enhanced by factors of ～*** angular resolutions,denoted by??s,are enhanced by a factor of ～*** improvements increase the number of detectable GW sources,facilitate multi-messenger follow-up observations and provide constraints on the cosmological constant.

关键词： space-based gravitational wave detection gravitational waves massive black hole binaries