检索结果-南通市图书馆

Dynamic Sulfur-Rich Polymers from Elemental Sulfur and Epoxides

Chinese Journal of Polymer Science 2024年第10期42卷 1479-1487,I0010页

作者： Ke-Xiang chen chen-hui cui Zhen Li Ting Xu Hao-Qing Teng Zhi-Yuan He Yin-Zhou Guo Xiao-Qing Ming Zhi-Shen Ge Yan-Feng Zhang Tie-Jun Wang School of Chemistry Engineering Research Center of Energy Storage Materials and DevicesMinistry of EducationXi’an Jiaotong UniversityXi’an710049China State Key Lab for Strength and Vibration of Mechanical Structures Department of Engineering MechanicsXi’an Jiaotong UniversityXi’an710049China

Sulfur-containing dynamic polymers had attracted significant attention due to their unique chemical structures with high *** sulfur, an inexpensive industrial waste product, to synthesize dynamic polysulfide polymers through reverse vulcanization has been a notable approach. However, this method required high temperatures and resulted in the release of unpleasant oders. In this study, we presented a robust method for the preparation of sulfur-rich polymers with dynamic polysulfide bonds from elemental sulfur and inexpensive epoxide monomers via a one-pot strategy at the mild room temperature. Different types of polysulfide molecules and polymers were synthesized by reacting various epoxide compounds with sulfur, along with the investigation of their structures and dynamic behaviors. It was noteworthy that the obatined polymers prepared from m-(2,3-epoxypropoxy)-N,N-bis(2,3-epoxypropyl)aniline and elemental sulfur exhibit multiple dynamic behaviors, including polysulfide metathesis and polysulfide-thiol exchange, enabling their rapid stress relaxation, self-healing, reprocessing and degradable properties of the cross-linked polymer. More importantly, the hydroxyl groups at the side chains from epoxide ring opening exhibited potential transesterification. This work provided a facile strategy for designing dynamic sulfur-rich polymers via a mild synthesis route.

关键词： Elemental sulfur Sulfur-containing polymer Dynamic covalent bond Dynamic polymer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Millisecond dynamics of colloidal suspension studied by X-ray photon correlation spectroscopy at the Shanghai Synchrotron Radiation Facility

引用

Nuclear Science and Techniques 2024年第1期35卷 1-9页

作者： chen-hui cui Zi-Mu Zhou Lin-Feng Wei Song-Lin Li Feng Tian Xiu-Hong Li Zhi Guo Yi-hui Xu Huai-Dong Jiang Ren-Zhong Tai Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Center for Transformative Science ShanghaiTech UniversityShanghai 201210China

X-ray photon correlation spectroscopy(XPCS)has emerged as a powerful tool for probing the nanoscale dynamics of soft condensed matter and strongly correlated materials owing to its high spatial resolution and penetration *** technique requires high brilliance and beam coherence,which are not directly available at modern synchrotron beamlines in *** facilitate future XPCS experiments,we modified the optical setup of the newly commissioned BL10U1 USAXS beamline at the Shanghai Synchrotron Radiation Facility(SSRF).Subsequently,we performed XPCS measurements on silica suspensions in glycerol,which were opaque owing to their high *** were collected using a high frame rate area detector.A comprehensive analysis was performed,yielding correlation functions and several key dynamic *** the results were consistent with the theory of Brownian motion and demonstrated the feasibility of XPCS at ***,by carefully optimizing the setup and analyzing the algorithms,we achieved a time resolution of 2 ms,which enabled the characterization of millisecond dynamics in opaque systems.

关键词： XPCS SSRF Silica suspension Glycerol Brownian motion Millisecond dynamics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Robust Object Tracking under Appearance Change Conditions

引用

International Journal of Automation and computing 2010年第1期7卷 31-38页

作者： Qi-Cong Wang Yuan-Hao Gong chen-hui Yang cui-Hua Li Department of Computer Science, Xiamen University, Xiamen 361005, PRC Department of Computer Science Xiamen University Xiamen PRC

We propose a robust visual tracking framework based on particle filter to deal with the object appearance changes due to varying illumination, pose variantions, and occlusions. We mainly improve the observation model and re-sampling process in a particle filter. We use on-line updating appearance model, affine transformation, and M-estimation to construct an adaptive observation model. On-line updating appearance model can adapt to the changes of illumination partially. Affine transformation-based similarity measurement is introduced to tackle pose variantions, and M-estimation is used to handle the occluded object in computing observation likelihood. To take advantage of the most recent observation and produce a suboptimal Gaussian proposal distribution, we incorporate Kalman filter into a particle filter to enhance the performance of the resampling process. To estimate the posterior probability density properly with lower computational complexity, we only employ a single Kalman filter to propagate Gaussian distribution. Experimental results have demonstrated the effectiveness and robustness of the proposed algorithm by tracking visual objects in the recorded video sequences.

关键词： Visual tracking particle filter observation model Kalman filter expectation-maximization (EM) algorithm

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Strong,Removable,and Photoluminescent Hyperbranched Polyamide-amine Hot Melt Adhesive

引用

Chinese Journal of Polymer Science 2021年第10期39卷 1319-1327,I0008页

作者： Si-Jia Zhang Xing-Xing chen chen-hui cui Li Ma Qian-Yun Zhong Kai-Xiang Shen Jing Yu Zhen Li You-Shen Wu Qiang Zhang Yi-Long cheng Ling He Yan-Feng Zhang School of Chemistry and Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and State Key Lab for Strength and Vibration of Mechanical Structures Xi'an Jiaotong UniversityXi'an 710049China

The development of adhesive technology is gaining increasing attention in machinery,electronics,aviation,and other ***,traditional adhesives are difficult to be peeled and removed after cross-linking and curing due to the limited solubility in common solvents,which causes pollution and damage to the surface of the *** this work,we synthesized random hyperbranched polyamide-amine hot melt adhesives through Michael addition of 1,8-octanediamine and N,N’-methylene diacrylamide(ODA-RHP HMA).Owing to the presence of various polar groups,ODA-RHP HMA exhibited robust lap shear strength to different substrates,including glass(6.6 MPa),ceramics(10.3 MPa),steel(11.5 MPa),and aluminum(11.8 MPa).Due to the hydrogen bonds in ODA-RHP,the HMA demonstrated intrinsic self-healing ability,which can be used repeatedly when being subjected to cyclic heating and *** ODA-RHP HMA can be swollen or dissolved in ethanol,the adhesives can be easily removed through *** addition,ODA-RHP exhibited aggregation-induced luminescence due to the tertiary amine structure in the molecular structure of ODA-RHP,which can be used in the field of cultural relics restoration.

关键词： Hot melt adhesive Polyamide-amine Reusability Cultural relics restoration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Deguelin inhibits expression of IκBα protein in Raji and U937 cells

引用

Acta Pharmacologica Sinica 2006年第4期27卷 485-490页

作者： Wei-hua chen Yan chen~2 Guo-hui cui Department of Hematology,Union Hospital.Tongji Medical College,Huazhong University of Science and Technology,Wuhan 430022,China Department of Hematology Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022 China

Aim:To determine whether deguelin can regulate the expression of nuclear factorkappa B(NF-κB)binding protein(IκBα)in U937 human leukemia cells and Rajihuman B lymphoma ***:The localization of IκBα protein was investi-gated by using an immunofluorescence *** expression of IκBα and NF-κB/p65 proteins in Raji and U937 cells were investigated by using Western *** was detected through annexin V/PI double-labeled ***:IκBα localized in the cytoplasm in untreated and deguelin-treated *** with tumor necrosis factor α(TNF-α)or deguelin plus TNF-α for 15 min,there was a substantial reduction in the amount of IκBα *** expressionof IκBα was downregulated by deguelin in Raji and U937 *** inducedapoptosis in U937 ***:Deguelin inhibited the expression of IκBαprotein in U937 and Raji *** anti-proliferative activity of deguelin is relatedto the signal pathway of NF-κB.

关键词： deguelin IkBα nuclear factor kappa B tumor necrosis factor-α apoptosis Raji cells U937 cells

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

CaH2-promoted activity of Ni-carbonate interface for CO2 methanation

引用

Journal of Energy Chemistry 2025年第1期100卷 522-532页

作者： Jin-Peng Wang Guo-cui Mao hui-Lin Jiang Bao-Xia Dong Yun-Lei Teng School of Chemistry and Chemical Engineering Yangzhou University

Transition metal-carbonate interfaces often act as active sites in heterogeneous catalytic *** interface between transition metal and metal carbonate exhibits a dynamic equilibrium during the CO2hydrogenation reaction,involving surface carbonate hydrogenation and ***,there have been few reports on engineering the activity of the interface between transition metal and alkaline earth metal carbonate for catalytic *** work demonstrated that the incorporation of CaH2in Ni/CaCO3enhances the CO2methanation activity of the *** CO2conversion for Ni/CaH2-CaCO3reached 68.5%at 400°C,which was much higher than that of the Ni/CaCO3（31.6%） and Ni/CaH2-CaO （42.4%） ***,the Ni/CaH2-CaCO3catalysts remained stable during the stability test for 24 h at 400°C and 8 *** research revealed that CaH2played a crucial role in promoting the activity of the Ni-carbonate interface for ***2could modify the electronic structure of Ni and tune the structural properties of CaCO3to generate medium basic sites （OH groups）,which are favorable for the activation of H2and ***-situ Fourier transform infrared spectroscopy （FTIR） analysis combined with density functional theory calculations demonstrated that CO2activation occurs at the hydroxyl group （OH） on the CaH2-modified Ni-carbonate surface,leading to the formation of CO3H****,our study has confirmed that CO2methanation over the Ni/CaH2-CaCO3catalysts proceeds via the formate pathway.

关键词： CO 2 methanation Metal hydride Ni catalysts Carbonate Metal-carbonate interface

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Investigation on the Photoelectric Properties of Polyoxovanadates

Investigation on the Photoelectric Properties of Polyoxovana...

引用

中国化学会第七届全国多酸化学学术研讨会

作者： Jia-Peng Cao Feng-cui Shen Xi-Ming Luo chen-hui cui Ning-Fang Li Ya-Qian Lan Yan Xu College of Chemical Engineering State Key Laboratory of Materials-Oriented Chemical EngineeringNanjing Tech University Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials Jiangsu Key Laboratory of New Power Batteries School of Chemistry and Materials Science Nanjing Normal University

Triazole,similar as imidazole,makes a prominent contribution to proton conductivity of porous *** investigate the effect of triazole-based ligands in polyoxovanadates (POVs) on proton conduction,we designed and synthesized two decavanadate-based POVs,[Zn(CHN)(HO)](VO)·14HO (1) and[Zn(CHN)(HO)](VO)·8HO (2) constructed by the ligands 3-amino-1,2,4-triazole and 1H-1,2,4-triazole,respectively,via the aqueous solution evaporation ***,compound 1 obtained superior proton conductivity of 1.24×10 S cm under 60℃and 98%RH,which is much higher than that of compound ***,due to the contribution of the conjugate property of the ligands,we also tried its research of two-photon responses and achieved satisfactory *** further investigate the third-order nonlinear optical (NLO) properties of POVs,two isolated polyoxovanadogermanates,[Cd(CHN)]{[Cd(CHN)][GeVO(OH)](HO)}·7HO (3)and{[Cd(CHN)][Cd(CHN)(HO)]}{[Cd(CHN)][Cd(CHN)]GeVO(OH)(HO)}·4HO (4),have been hydro-/solvothermally synthesized and structurally ***,it is the first time to investigate the nonlinear optical (NLO) properties of vanadium-based heteropolyacids and obtain strong two photon *** results of open aperture Z-scan based on the two compounds manifest that they are the highest value among the reported polyoxovanadates and may be a decent potential NLO *** the same time,the electrochemical and electrocatalytic properties of compounds 3 were also measured in detail.

关键词： Polyoxovanadates Proton Conductivity Third-order NLO Properties Electrochemical and Electrocatalytic Properties

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

Asymmetric Transfer Hydrogenation of Prochiral Ketones in Aqueous Media with New Water-Soluble Chiral Vicinal Diamine as Ligand

引用

有机化学 2003年第Z1期23卷 63-63页

作者： ZHU Jin MA Ya-Ping LIU hui chen Li cui Xin DENG Jin-Gen Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province and Union Laboratory of Asymmetric Synthesis Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu 610041 Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province and Union Laboratory of Asymmetric Synthesis Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu 610041 Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province and Union Laboratory of Asymmetric Synthesis Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu 610041 Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province and Union Laboratory of Asymmetric Synthesis Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu 610041 Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province and Union Laboratory of Asymmetric Synthesis Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu 610041 Key Laboratory of Asymmetric Synthesis and Chirotechnology of Sichuan Province and Union Laboratory of Asymmetric Synthesis Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu 610041

　　As a consequence of the increasing demand for atom economy and environmental friendly methods, the water soluble ligands and their metal complexes are of great interest in catalytic synthesis because of simpler product sepa ration and the possibility of recycling. [1] Unique reactivity and selectivity are often observed in aqueous reactions. [2]Recently, we have developed a new water-soluble chiral vicinal diamine and synthesized its mono-N-tosylated derivative for the first time. The application of its mono-N-tosylated derivative in catalytic asymmetric transfer hydrogenation of prochiral ketones was examined in aqueous media. High activity (up to ＞ 99 % conv. ) and good enatioselectivity ( up to 98% ee ) were achieved for most of prochiral aromatic ketones in organic solvent free system. [3]……

关键词： Aqueous Media Prochiral Ketones transfer hydrogenation environmental friendly solvent free system catalytic synthesis prochiral ketones aromatic ketones metal complexes water soluble aqueous media atom economy

来源：

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

基于演化博弈的旅游市场监管机制研究

引用

系统工程学报 2016年第5期31卷 618-624,709页

作者：周辉陈淑凌崔亚梅江苏大学管理学院江苏镇江212013

针对旅游市场存在的严重宰客现象,探讨如何健全旅游市场监管机制问题.通过构建"旅游企业-游客-政府"三者之间的演化博弈模型,分析了影响各博弈主体策略选择与演化的因素,经模型求解确立各方行为策略趋于稳定状态的条件.研究表明,任何一... 详细信息

针对旅游市场存在的严重宰客现象,探讨如何健全旅游市场监管机制问题.通过构建"旅游企业-游客-政府"三者之间的演化博弈模型,分析了影响各博弈主体策略选择与演化的因素,经模型求解确立各方行为策略趋于稳定状态的条件.研究表明,任何一方主体行为的演化趋势都与其他两方的策略选择密切相关;降低游客举报投诉成本、加大宰客旅游企业的处罚力度,同时降低政府监管成本、增加政府监管收益、提高政府成功查处宰客旅游企业的概率,是有效构建旅游市场监管机制的关键.

关键词：旅游宰客演化博弈演化稳定策略三方参与主体

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Vector meson's spin alignments in high energy reactions

引用

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 5-20页

作者： Jin-hui chen Zuo-Tang Liang Yu-Gang Ma Xin-Li Sheng Qun Wang Key Laboratory of Nuclear Physics and Ion-beam Application (MoE) Institute of Modern PhysicsFudan University Institute of Frontier and Interdisciplinary Science Key Laboratory of Particle Physics and Particle Irradiation (MOE)Shandong University INFN-Firenze Department of Modern Physics University of Science and Technology of China School of Mechanics and Physics Anhui University of Science and Technology

The global spin alignment of vector mesons has been observed by the STAR collaboration at the Relativistic Heavy Ion Collider （RHIC） at Brookhaven National Laboratory （BNL）.It provides a unique opportunity to probe the correlation between the polarized quark and antiquark in the strongly coupled quark-gluon plasma （sQGP） produced in relativistic heavy ion collisions,opening a new window to explore the properties of s *** addition,spin alignments of vector mesons have also been observed in other high-energy particle collisions such as e+e-annihilations at high energies where hadron production is dominated by quark fragmentation *** results obtained are quite different from those obtained in heavy ion collisions where quark coalescence/combination mechanism dominates suggesting strong dependence on hadronization *** comprehensive studies in different hadronization processes are *** this article,we present a brief review of theoretical and experimental advances in the study of vector meson’s spin alignments in a variety of high-energy particle collisions,with emphasis on hadronization mechanisms.

关键词： vector meson spin alignment global polarization relativistic heavy ion collisions fragmentation

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：