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地铁高清视频监控系统存储扩容方案研究

现代信息科技 2024年第13期8卷 167-170,175页

作者：龚建生许丽金刘东付一鸣武汉地铁运营有限公司湖北武汉430000

武汉轨道交通线网部分线路设计和开通年限较长,无法满足《防恐法》公共区域及重点部位视频监控图像信息保存期限不少于90天的要求。研究立足于城市轨道交通运营实际,提出一种基于ONVIF协议的辅码流异地备份存储方案,实现了对既有高清视... 详细信息

武汉轨道交通线网部分线路设计和开通年限较长,无法满足《防恐法》公共区域及重点部位视频监控图像信息保存期限不少于90天的要求。研究立足于城市轨道交通运营实际,提出一种基于ONVIF协议的辅码流异地备份存储方案,实现了对既有高清视频监控系统的存储扩容。该方案已应用于武汉轨道交通某三线换乘站,相比本地存储扩容方案具有实施简单、对运营影响小、改造成本低的优势,对城市轨道交通高清视频监控系统存储90天扩容改造具有一定的指导意义。

关键词：视频监控 ONVIF协议异地备份存储扩容城市轨道交通

Preparation of Photo-responsive DNA Supramolecular Hydrogels and Their Application as UV Radiometers

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Chemical Research in Chinese Universities 2023年第1期39卷 115-120页

作者： DING Yuqiao LI Yujie YANG Bo PAN Yufan CHENG Jiafeng MENG Siwen LIU Dongsheng xu lijin DONG Yuanchen Department of Chemistry Renmin University of ChinaBeijing100872P.R.China Engineering Research Center of Advanced Rare Earth Materials Ministry of EducationDepartment of ChemistryTsinghua UniversityBeijing100084P.R.China CAS Key Laboratory of Colloid Interface and Chemical ThermodynamicsBeijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing100190P.R.China University of Chinese Academy of Sciences Beijing100049P.R.China

Ultraviolet light(UV)is an essential component of ambient light,but high dose UV would damage genome *** semiconductors and soft materials have been employed to detect the UV,the complex process and the instrumental requirement have limited the application in daily *** this study,taking advantage of sequence designability,a series of hydrogels with different gel-sol transition rates was constructed under the same UV intensity by introducing competing hybridization to tune the stability of the molecular *** estimating the transition time between each system under UV light irradiation,the intensity of UV could be roughly estimated,which provided a convenient method for the visual detection of UV.

关键词： Photo-responsive DNA hydrogel Azobenzene Gel-sol transition UV detection

Reinforcing DNA Supramolecular Hydrogel with Polymeric Multiple-Unit Linker

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CCS Chemistry 2023年第2期5卷 434-444页

作者： Yujie Li Yuqiao Ding Bo Yang Tianyang Cao Jiangfei xu Yuanchen Dong Quan Chen lijin xu Dongsheng Liu Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology Department of ChemistryTsinghua UniversityBeijing 100084 Department of Chemistry Renmin University of ChinaBeijing 100872 Key Laboratory of Organic Optoelectronics and Molecular Engineering Department of ChemistryTsinghua UniversityBeijing 100084 CAS Key Laboratory of Colloid Interface and Chemical ThermodynamicsBeijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190 State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022

While supramolecular hydrogels have received growing interest due to their unique dynamic features,their relatively weak mechanical properties have largely limited their biomedical *** this study,we propose and demonstrate a strategy to reinforce the mechanical properties of supramolecular hydrogel by introducing polymeric multiple-unit linker(PMUL),which incorporates multiple supramolecular units into a polymeric backbone to crosslink supramolecular *** demonstrated that PMUL can effectively improve the kinetic stability of supramolecular crosslinkers through multiple-unit interaction in a DNA supramolecular hydrogel model system,thus leading to higher mechanical ***,the dynamic features of the supramolecular hydrogels have been well preserved,including shear-thinning,self-healing properties,and reversible thermal *** strategy offers a simple but effective way for mechanical reinforcement of supramolecular hydrogels to construct novel biomaterials.

关键词： mechanical reinforcement supramolecular hydrogels DNA polymericmultiple-unit linkers thermorheological behavior

DNA-based supramolecular hydrogels:From construction strategies to biomedical applications

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Chinese Chemical Letters 2023年第12期34卷 76-86页

作者： Ping Chen Chenhong Yu Jie Chen lijin xu Huajie Liu jiangsu Engineering Laboratory for Environmental Functional Materials Jiangsu Key Lab for Chemistry of Low-Dimensional MaterialsSchool of Chemistry and Chemical EngineeringHuaiyin Normal UniversityHuaian 223300China School of Chemical Science and Engineering Shanghai Research Institute for Intelligent Autonomous SystemsKey Laboratory of Advanced Civil Engineering Materials of Ministry of EducationTongji UniversityShanghai 200092China Department of Chemistry Renmin University of ChinaBeijing 100872China

DNA-based supramolecular hydrogels are important and promising biomaterials for various applications due to their inherent biocompatibility and tunable physicochemical *** three-dimensional supramolecular matrix of DNA formed by non-covalently dynamic cross-linking provides exceptional adaptability,self-healing,injectable and responsive properties for *** addition,DNA hydrogels are also ideal bio-scaffold materials owing to their tissue-like mechanics and intrinsic biological ***,DNA can assemble into supramolecular networks by pure complementary base pairing;it can also be combined with other building blocks to construct hybrid *** review focuses on the development and construction strategies of DNA *** and synthesis methods,diverse responsiveness and biomedical applications are ***,the challenges and prospects of DNA-based supramolecular hydrogels are discussed.

关键词： DNA hydrogels Supramolecular hydrogels Self-assembly DNA nanotechnology Biomedical applications

Density of excess modes below the first phonon mode in four-dimensional glasses

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Chinese Physics B 2024年第7期33卷 483-489页

作者：王利近胥鼎张世允 School of Physics and Optoelectronic Engineering Anhui UniversityHefei 230601China Department of Physics University of Science and Technology of ChinaHefei 230026China

Glasses are known to possess low-frequency excess modes beyond the Debye *** decades,it has been assumed that evolution of low-frequency density of excess modes D(ω) with frequency ω follows a power-law scaling:D(ω)~ω~γ.However,it remains debated on the value of γ at low frequencies below the first phonon-like mode in finitesize *** simulation studies reported γ=4 at low frequencies in two-(2D),three-(3D),and four-dimensional(4D)glasses,whereas recent observations in 2D and 3D glasses suggested γ=3.5 in a lower-frequency *** is uncertain whether the low-frequency scaling of D(ω)~ω^(3.5) could be generalized to 4D ***,we conduct numerical simulation studies of excess modes at frequencies below the first phonon-like mode in 4D model *** is found that the system size dependence of D(ω) below the first phonon-like mode varies with spatial dimensions:D(ω) increases in2D glasses but decreases in 3D and 4D glasses as the system size ***,we demonstrate that the ω^(3.5)scaling,rather than the ω~4 scaling,works in the lowest-frequency regime accessed in 4D glasses,regardless of interaction potentials and system sizes ***,our findings in 4D glasses,combined with previous results in 2D and 3D glasses,suggest a common low-frequency scaling of D(ω)~ ω^3.5) below the first phonon-like mode across different spatial dimensions,which would inspire further theoretical studies.

关键词： vibrational density of states excess modes four-dimensional glasses scaling computer simulation

Nanowear of a Zr Based Bulk Metallic Glass/Nanocrystalline Alloy

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材料热处理学报 2004年第5B期25卷 1195-1198页

作者： LIANGSong HEJian-ying CHUWu-yang lijin-xu SUNDong-bai QIAOLi-jie DepartmentofMaterialsPhysicsandChemistry UniversityofScienceandTechnologyBejingBeijing100083P.R.China DepartmentofMaterialsPhysicsandChemistry UniversityofScienceandTechnologyBeijingBeijing100083P.R.China／／BeijingEngineering-ResearchCenterforSurfaceNano-TechnologyBeijing100083P.R.China

The hardness, elastic modulus, nano-scratch resistance and wear depth for a bulk metallic glass of and its partial crystallization alloys have been measured by using nanoindentation method. The results showed that partial crystallization did not influence the reduced elastic modulus but increased the hardness, and then increased the scratch coefficient. The scratch coefficient increased linearly with increasing the hardness H but decreases when W>6.2GPa. Partial crystallization decreased evidently the wear depth, and when the load was large the wear depth decreased with increasing the hardness.

关键词：微晶合金锆金属玻璃部分结晶毫微磨损

SF5-Containing Heterocycles Synthesis: One-pot C-H Activated Cyclization from SF5-Anilines

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SF5-Containing Heterocycles Synthesis: One-pot C-H Activated...

SF5-Containing Heterocycles Synthesis:One-pot C-H Activated Cyclization from SF5-Anilines

中国化学会第九届全国有机化学学术会议

作者： xueling Mi Jing Chen lijin xu College of Chemistry Beijing Normal University Department of Chemistry Renmin University of China

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SF5-Containing Heterocycles Synthesis:One-pot C-H Activated ...

风景区建筑设计探析——以平潭限山岛旅游配套设施设计为例

中国化学会第30届学术年会-第四十五分会：物理有机

作者： xueling Mi Jing Chen lijin xu College of Chemistry Beijing Normal University Department of Chemistry Renmin University of China

Due to its unique structural and chemo/physical properties such as high lipophilicity,strong electron-withdrawing effect and steric bulkness,pentafluorosulfanyl(SF)moiety has beenregarded as a new generation of fluorine substituent and SF5-containing compounds have received increasing attention in material sciences as well as in medicinal *** having been prepared almost half a century ago,synthetic chemistry with organic sulfur pentafluorides has been remained largely underdeveloped due to the difficulties in accessing SF5-containing building

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福建建筑 2023年第5期 86-90页

作者：徐丽瑾福建省建筑设计研究院有限公司福建福州350001

随着人民生活水平的提高和疫情的结束,国内旅游业近几年来高速发展,景区配套设施建设要求也在不断提高。景区建筑设计如何在承载重要的旅游配套功能基础上,同时与风貌协调,进一步为风景增色,提高游者对于风景区的总体印象,是摆在每个设... 详细信息

随着人民生活水平的提高和疫情的结束,国内旅游业近几年来高速发展,景区配套设施建设要求也在不断提高。景区建筑设计如何在承载重要的旅游配套功能基础上,同时与风貌协调,进一步为风景增色,提高游者对于风景区的总体印象,是摆在每个设计者面前的课题。文章基于一个海岛旅游配套项目的设计过程,借用“第三自然”概念,从三个维度讨论建筑与自然景观的关系,以期探寻一条风景区建筑设计的路径。

关键词：风景区建筑第三自然 “网红”打卡点