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A Simplified Nonlinear Model of Vertical Vortex-Induced Force on Box Decks for Predicting Stable Amplitudes of Vortex-Induced Vibrations

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Engineering 2017年第6期3卷 854-862页

作者： Le-Dong Zhu xiao-liang meng Lin-Qing Du Ming-Chang Ding State Key Laboratory of Disaster Reduction in Civil Engineering & Department of Bridge Engineering College of Civil Engineering & Key Laboratory for Wind Resistance Technology of Bridges of Ministry of Transport Tongji University Shanghai 200092 China Shanghai Urban Construction Municipal Engineering (Croup) Co. Ltd. Shanghai 200065 China Tongji Architectural Design (Group) Co. Ltd. Shanghai 200092 China Highway Planning Survey Design and Research Institute Sichuan Provincial Transport Department Chengdu 610041 China

Wind-tunnel tests of a large-scale sectional model with synchronous measurements of force and vibration responses were carried out to investigate the nonlinear behaviors of vertical vortex-induced forces （VIFs） on three typical box decks （i.e., fully closed box, centrally slotted box, and semi-closed box）. The mechanisms of the onset, development, and self-limiting phenomenon of the vertical vortex-induced vibration （VlV） were also explored by analyzing the energy evolution of different vertical VIF components and their contributions to the vertical VIV responses. The results show that the nonlinear components of the vertical VIF often differ from deck to deck; the most important components of the vertical VIF, governing the stable amplitudes of the vertical VIV responses, are the linear and cubic components of velocity contained in the self-excited aerodynamic damping forces. The former provides a constant negative damping ratio to the vibration system and is thus the essential power driving the development of the VIV amplitude, while the latter provides a positive damping ratio proportional to the square of the vibration velocity and is actually the inherent factor making the VIV amplitude self-limiting. On these bases, a universal simplified nonlinear mathematical model of the vertical VIF on box decks of bridges is presented and verified in this paper; it can be used to predict the stable amplitudes of the vertical VIV of long-span bridges with satisfactory accuracy.

关键词： Box deck of bridge Vertical vortex-induced vibration Vertical vortex-induced force Simplified nonlinear model Wind-tunnel test Large-scale sectional model Synchronous measurement of force and vibration

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Analysis of the urinary peptidome associated with Helicobacter pylori infection

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World Journal of Gastroenterology 2011年第5期17卷 618-624页

作者： Di xiao Fan-liang meng Li-Hua He Yi-Xin Gu Jian-Zhong Zhang National Institute for Communicable Disease Controland Prevention Chinese Center for Disease Control and Pre-vention Beijing 102206 China

AIM： To investigate the relationship between urinary peptide changes and Helicobacter pylori （H. pylorl） infection using urinary peptidome profiling. METHODS： The study was performed in volunteers （n = 137） who gave informed consent. Urinary peptides were enriched by magnetic beads based weak cation exchange chromatography＇and spectrums acquired by matrix-assisted laser desorption/ionization time-of-flight （MALDI-TOF） mass spectrometry （MS）. ClinProTools bioinformatics software was used for statistical analysis and the recognition of peptide patterns. The marker peptides were identified by LTQ Obitrap XL tandem MS. RESULTS： Approximately 50 proteins or peptides which loaded onto the magnetic beads were detected by MAL-DI-TOF MS. By optimizing the parameters of the model, the Genetic Algorithm model had good recognition capability （97%） and positive predictive value （94%）. Based on the model, 2 markers with molecular masses of 6788 and 1912 Da were found that differentiated between H. pylori positive and negative volunteers. The m/z 1912 sequence was parsed as SKQFTSSTSYN- RGDSTF. The peptide was identified as isoform 1 of the fibrinogen a chain precursor, whose concentration in urine was markedly higher in H. pylori infected volunteers than in H. pylori non-infected ones. CONCLUSION： The appearance of urinary fibrinogen degradation products is caused by an active H. pyloriinduced process.

关键词： Urinary peptidome profiling MB-matrix-assisted laser desorption/ionization time-of-flight massspectrometry Helicobacter pylori Fibrinogen degrada-tion products

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Treatment and Outcome of Epileptogenic Temporal Cavernous Malformations

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Chinese Medical Journal 2015年第7期128卷 909-913页

作者： Yong-Zhi Shan xiao-Tong Fan liang meng Yang An Jian-Kun Xu Guo-Guang Zhao Department of Neurosurgery Xuanwu Hospital Capital Medical University Beijing 100053 China

Background： The aim of this study is to explore the treatment and outcome ofepileptogenic temporal lobe cavernous malformations （CMs）. Methods： We analyzed retrospectively the profiles of 52 patients diagnosed as temporal lobe CMs associated with epilepsy. Among the 52 cases, 11 underwent a direct resection of CM along with the adjacent zone of hemosiderin rim without electrocorticogram （ECoG） monitoring while the other 41 cases had operations under the guidance of ECoG. Forty-six patients were treated by lesionectomy ＋ hemosiderin rim while the other six were treated by lesionectomy ＋ hemosiderin rim along with extended epileptogenic zone resection. The locations of lesions, the duration of illness, the manifestation, the excision ranges and the outcomes of postoperative follow-up were analyzed, respectively. Results： All of the 52 patients were treated by microsurgery. There was no neurological deficit through the long-term follow-up. Outcomes of seizure control are as follows： 42 patients （80.8%） belong to Engel Class I, 5 patients （9.6%） belong to Engel Class II, 3 patients （5.8%） belong to Engel Class Ill and 2 patients （3.8%） belong to Engel Class IV. Conclusion： Patients with epilepsy caused by temporal CMs should be treated as early as possible. Resection of the lesion and the surrounding hemosiderin zone is necessary. Moreover, an extended excision of epileptogenic cortex or cerebral lobes is needed to achieve a better prognosis if the ECoG indicates the existence of an extra epilepsy onset origin outside the lesion itself.

关键词： Cavernous Mallbrmation Electrocorticogram Epilepsy Surgery Temporal Lobe

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美国顶级高校智库的信息服务调查

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图书馆论坛 2017年第8期37卷 143-150页

作者：梁宵萌北京大学信息管理系

文章通过网站调研方式,从网络信息组织、信息公开、移动信息服务三个角度调查美国25家顶级高校智库的信息服务情况,总结出美国顶级高校智库的四大信息服务启示:依托图书馆资源开展信息服务;信息成果类型多元化;信息传播渠道社会媒体化;... 详细信息

文章通过网站调研方式,从网络信息组织、信息公开、移动信息服务三个角度调查美国25家顶级高校智库的信息服务情况,总结出美国顶级高校智库的四大信息服务启示:依托图书馆资源开展信息服务;信息成果类型多元化;信息传播渠道社会媒体化;信息服务订制化。

关键词：美国高校智库信息服务网络信息组织移动信息服务社会媒体订制

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脉冲电化学氧化降解亚甲基蓝

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中国环境科学 2018年第5期38卷 1767-1773页

作者：雷佳妮李晓良袁孟孟徐浩延卫西安交通大学环境科学与工程系陕西西安710049

为改善传统电化学氧化的缺陷,将脉冲式供电引入到电化学氧化中,利用Ti/Pb O_2-PVDF电极,对亚甲基蓝(MB)模拟染料废水进行电化学氧化降解处理,分析初始浓度、脉冲电压、脉冲频率、占空比和Na Cl浓度等因素对降解效果的影响.结果表明,当M... 详细信息

为改善传统电化学氧化的缺陷,将脉冲式供电引入到电化学氧化中,利用Ti/Pb O_2-PVDF电极,对亚甲基蓝(MB)模拟染料废水进行电化学氧化降解处理,分析初始浓度、脉冲电压、脉冲频率、占空比和Na Cl浓度等因素对降解效果的影响.结果表明,当MB初始浓度为100mg/L,脉冲电压为5.5V,脉冲频率为1500Hz,占空比为50%,Na Cl浓度为0.01mol/L时,降解效果最好.在相同条件下,比较脉冲与直流两种供电模式下的电化学氧化效果.结果表明脉冲模式下,90min内MB脱色率、COD去除率及电流效率分别为100%、94.5%和60.1%,均高于直流模式;脉冲模式下能耗为0.013k Wh/g COD,远小于直流模式的0.107k Wh/g COD.上述结果表明脉冲供电模式相比于直流供电模式具有明显优势.

关键词：染料废水二氧化铅电化学氧化脉冲供电模式亚甲基蓝

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Joint Probabilistic Scheduling and Resource Allocation for Wireless Networked Control Systems

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IEEE/CAA Journal of Automatica Sinica 2025年第1期 258-260页

作者： meng Zheng Lei Zhang Wei liang IEEE the State Key Laboratory of Robotics and the Key Laboratory of Networked Control Systems Shenyang Institute of Automation Chinese Academy of Sciences the University of Chinese Academy of Sciences

Dear Editor,This letter presents a joint probabilistic scheduling and resource allocation method(PSRA) for 5G-based wireless networked control systems(WNCSs). As a control-aware optimization method, PSRA minimizes the linear quadratic Gaussian(LQG) control cost of WNCSs by optimizing the activation probability of subsystems, the number of uplink repetitions, and the durations of uplink and downlink phases. Simulation results show that PSRA achieves smaller LQG control costs than existing works.

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Smart Cellulose‑Based Janus Fabrics with Switchable Liquid Transportation for Personal Moisture and Thermal Management

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Nano-Micro Letters 2025年第1期17卷 333-347页

作者： Jianfeng Xi Yanling Lou Liucheng meng Chao Deng Youlu Chu Zhaoyang Xu Huining xiao Weibing Wu Jiangsu Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsJiangsu Provincial Key Lab of Sustainable Pulp and Paper Technology and Biomass MaterialsNanjing Forestry UniversityNanjing 210037People’s Republic of China College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037People’s Republic of China Department of Chemical Engineering University of New BrunswickFrederictonNB E3B 5A3Canada Macromolecular Chemistry and Bavarian Polymer Institute University of BayreuthBayreuth 95440Germany

The Janus fabrics designed for personal moisture/thermal regulation have garnered significant attention for their potential to enhance human ***,the development of smart and dynamic fabrics capable of managing personal moisture/thermal comfort in response to changing external environments remains a ***,a smart cellulose-based Janus fabric was designed to dynamically manage personal moisture/*** cotton fabric was grafted with N-isopropylacrylamide to construct a temperature-stimulated transport ***,hydrophobic ethyl cellulose and hydrophilic cellulose nanofiber were sprayed on the bottom and top sides of the fabric to obtain wettability *** fabric exhibits anti-gravity directional liquid transportation from hydrophobic side to hydrophilic side,and can dynamically and continuously control the transportation time in a wide range of 3–66 s as the temperature increases from 10 to 40℃.This smart fabric can quickly dissipate heat at high temperatures,while at low temperatures,it can slow down the heat dissipation rate and prevent the human from becoming too *** addition,the fabric has UV shielding and photodynamic antibacterial properties through depositing graphitic carbon nitride nanosheets on the hydrophilic *** smart fabric offers an innovative approach to maximizing personal comfort in environments with significant temperature variations.

关键词： Directional water transport Cotton fabric Anti-gravity directional liquid transportation Janus wettability

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Innovative dual-mode device integrating capacitive desalination and solar vapor generation for high-efficiency seawater desalination

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Journal of Energy Chemistry 2025年第1期100卷 171-179页

作者： Jiacheng Wang Zhaoyu Chen Ruduan Yuan Jiaxin Luo Ben Zhang Keju Ji meng Li Juanxiu xiao Kuan Sun National Innovation Center for Industry-Education Integration of Energy Storage Technology MOE Key Laboratory of Low-grade Energy Utilization Technologies and SystemsCollege of Energy & Power Engineering Chongqing University Xuefeng Mountain Energy Equipment Safety National Observation and Research Station CQU-NUS Renewable Energy Materials & Devices Joint Laboratory Chongqing University Southwest Technology and Engineering Research Institute Jiangsu Provincial Key Laboratory of Bionic Functional Materials College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics State Key Laboratory of Marine Resources Utilization in South China Sea Collaborative Innovation Center of Marine Science and Technology School of Marine Science and Engineering Hainan University

Solar-driven interface evaporation with high solar-to-steam conversion efficiency has shown great potential in seawater ***,due to the influence of latent heat and condensation efficiency,the water yield from solar-driven interface evaporation remains insufficient,posing a significant challenge that requires *** this work,we designed a dual-mode high-flux seawater desalination device that combines solar-driven interface evaporation and capacitive *** utilizing coupled desalination materials exhibiting both photothermal conversion and capacitance activity,the device demonstrated photothermal evaporation rates of 1.41 and 0.97 kg m-2h-1for condensate water yield under one-sun ***,the device exhibited a salt adsorption capacity of up to48 mg g-1and a salt adsorption rate of 2.1 mg *** addition,the salt adsorption capacity increased by approximately 32% under one-sun ***,photo-enhanced capacitive desalination performance was explored through numerical simulations and theoretical *** calculations and characterizations confirmed that the defect energy levels formed by the introduction of sulfur vacancies can effectively widen the light absorption range,improve photothermal conversion performance,and stimulate more photoelectrons to participate in capacitive ***,the electron distribution state of molybdenum disulfide with sulfur vacancies and surface defect sites contributes to ion/electron transport at the solid-liquid *** work provides a novel pathway for integrating solar vapor generation with other low-energy desalination technologies.

关键词： Desalination

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我国科研人员对图书馆开展出版服务的认知及需求调查

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图书馆论坛 2017年第4期37卷 23-31页

作者：刘兹恒苗美娟梁宵萌北京大学信息管理系

文章利用问卷形式调研我国科研人员对学术图书馆出版服务的认知及需求情况。调查发现:我国科研人员对图书馆出版服务的认识不足,但需求明显;学科及内部因素是影响科研人员选择图书馆出版的重要因素;科研人员对出版类型和出版服务需求多... 详细信息

文章利用问卷形式调研我国科研人员对学术图书馆出版服务的认知及需求情况。调查发现:我国科研人员对图书馆出版服务的认识不足,但需求明显;学科及内部因素是影响科研人员选择图书馆出版的重要因素;科研人员对出版类型和出版服务需求多样,各有侧重;科研人员在服务收费上存在较为明显的差异。文章认为学术图书馆参与出版服务有其必要性、重要性和有利条件,学术图书馆应将自身定位为辅助传统学术出版,着眼于学术作品的公开传播、共享及永久保存,主动提供学术出版服务。

关键词：图书馆出版服务科研人员

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

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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

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