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A Computational Study on Iridium-Catalyzed Production of Acetic Acid from Ethanol and Water Solution

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Chinese Journal of Chemistry 2019年第9期37卷 883-886,I0002页

作者： Xin Yue Longfei Li Pengjie Li chenguang luo Min Pu Zuoyin Yang Ming Lei State Key Laboratory of Chemical Resource Engineering Institute of Computational ChemistryCollege of ChemistryBeijing University of Chemical TechnologyBeijing 100029China College of Pharmaceutical Science Hebei UniversityBaodingHebei 071002China

The mechanism for the production of acetic acid from ethanol and water mixture catalyzed by iridium catalyst has been theoretically *** cooperation of the iridium center and bpyO ligand is highlighted,which plays an important role in the catalytic *** hydrogen release from the iridium center is the rate-determining step,with an energy barrier of 22.5 kcal/*** electronic structure analysis suggests electron-donating substituents could decrease the energy barrier.

关键词： Iridium-Catalyzed Production Acetic Acid Ethanol Water Solution

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基于本体的古籍知识库建设初探

现代图书情报技术 2007年第4期 8-11页

作者：罗晨光山川王珊北京大学数学科学学院北京100871 北京大学信息管理系北京100871 湖南科技大学外国语学院湘潭411201

以古籍描述元数据著录规则为基础,提出一种基于本体语义的古籍知识库建设方案,给出知识库的结构框架,并以语义网为工具对方案作了简要的实现。

关键词：古籍知识库本体语义网

抽水蓄能机组励磁交流断路器稳定运行提升改造

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水电站机电技术 2024年第7期47卷 59-61页

作者：李振兴许鑫罗晨光国网新源河北丰宁抽水蓄能有限公司河北承德068350 国电南瑞科技股份有限公司电气控制分公司江苏南京210003

针对ABB公司生产的E3/H E MS2500系励磁交流断路器由于家族性缺陷,静触头烧熔导致抽水蓄能电站多台机组相继跳机的事件,详细介绍了此断路器的维护检查项目以及无线温度监视装置加装的应用过程,保证了断路器本体的安全可靠运行,可为行业... 详细信息

针对ABB公司生产的E3/H E MS2500系励磁交流断路器由于家族性缺陷,静触头烧熔导致抽水蓄能电站多台机组相继跳机的事件,详细介绍了此断路器的维护检查项目以及无线温度监视装置加装的应用过程,保证了断路器本体的安全可靠运行,可为行业内其它单位的类似设备问题提供参考。

关键词：励磁交流断路器静触头转子一点接地事故跳机无线测温

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Sparse Reconstruction and Damage Imaging Method Based on Uniform Sparse Sampling

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Acta Mechanica Solida Sinica 2020年第6期33卷 744-755页

作者： Pengfei Li Ying luo Kan Feng Yang Zhou chenguang Xu National Center for International Research on Structural Health Management of Critical Components Jiangsu UniversityZhenjiang 212013China

The full wavefield detection method based on guided waves can efficiently detect and locate damages relying on the collection of large amounts of wavefield *** acquisition process by scanning laser Doppler vibrometer(SLDV)is generally time-consuming,which is limited by Nyquist sampling *** reduce the acquisition time,full wavefield data can be reconstructed from a small number of random sampling point signals combining with compressed ***,the random sampling point signals need to be obtained by adding additional components to the SLDV system or offline *** the random sparse sampling is difficult to achieve via the SLDV system,a new uniform sparse sampling strategy is proposed in this *** using the uniform sparse sampling coordinates instead of the random spatial sampling point coordinates,sparse sampling can be applied to SLDV without adding additional components or offline *** simulation and experimental results show that the proposed strategy can reduce the measurement locations required for accurate signal recovery to less than 90%of the Nyquist sampling grid,and the damage location error is within the minimum half *** with the conventional jittered sampling strategy,the proposed sampling strategy can directly reduce the sampling time of the SLDV system by more than 90%without adding additional components and achieve the same accuracy of guided wavefield reconstruction and damage location as the jittered sampling *** research results can greatly improve the efficiency of damage detection technology based on wavefield analysis.

关键词： Scanning laser Doppler vibrometer Lamb waves Compressed sensing Wavefield sparse reconstruction Damage imaging

Disseminating Authorized Content via Data Analysis in Opportunistic Social Networks

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Big Data Mining and Analytics 2019年第1期2卷 12-24页

作者： chenguang Kong Guangchun luo Ling Tian Xiaojun Cao the Department of Computer Science Georgia State University the School of Computer Science and Engineering University of Electronic Science and Technology of China

Authorized content is a type of content that can be generated only by a certain Content Provider(CP).The content copies delivered to a user may bring rewards to the CP if the content is adopted by the user. The overall reward obtained by the CP depends on the user's degree of interest in the content and the user's role in disseminating the content copies. Thus, to maximize the reward, the content provider is motivated to disseminate the authorized content to the most interested users. In this paper, we study how to effectively disseminate the authorized content in Interest-centric Opportunistic Social Networks(IOSNs) such that the reward is *** first derive Social Connection Pattern(SCP) data to handle the challenging opportunistic connections in IOSNs and statistically analyze the interest distribution of the users contacted or connected. The SCP is used to predict the interests of possible contactors and connectors. Then, we propose our SCP-based Dissemination(SCPD)algorithm to calculate the optimum number of content copies to disseminate when two users meet. Our dataset based simulation shows that our SCPD algorithm is effective and efficient to disseminate the authorized content in IOSNs.

关键词： opportunistic social networks content dissemination interest centric data analytics

Review of protection and fault handling for a flexible DC grid

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Protection and Control of Modern Power Systems 2020年第1期5卷 138-152页

作者： Jinghan He Keao Chen Meng Li Yiping luo chenguang Liang Yin Xu Beijing Jiaotong University Beijing 100044China

With the development of power electronics technology,the flexible DC grid will play a significant role in promoting the transformation and reformation of the power *** is immune to commutation failure and has high flexibility in power control and renewable energy grid ***,the protection and fault handling technology for a flexible DC grid is a big challenge because of the limited overcurrent capability of the *** paper summarizes the development of the flexible DC grid,and analyzes the fault characteristics in ***,the applicability,advantages and disadvantages of the existing protection principle,fault isolation and recovery schemes are ***,the key problems and development trend of the future flexible DC grid are pointed out and forecasted respectively.

关键词： Flexible DC power grid Fault analysis Protection Fault isolation Reclose

Influence of minor boron on the microstructures of a second generation Nibased single crystal superalloy

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Progress in Natural Science:Materials International 2018年第4期28卷 483-488页

作者： Yunsong Zhao chenguang Liu Yuanyuan Guo Yanfei Liu Jian Zhang Yushi luo Dingzhong Tang Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

Boron is added into single crystal superalloys as a micro-alloying element to strengthen low angle grain ***,systematic investigations on the effect of boron on microstructures of single crystal superalloys are limitedly *** effect of boron on as-cast and heat-treated microstructures was investigated in two experimental Ni-based single crystal superalloys containing 3 wt% *** current results indicated that the volume fraction of（γ+γ′）eutectic and M3B2borides was evidently increased,while the number of micropores was evidently decreased with the addition of 0.02 wt% ***（γ+γ′）eutectic could not be dissolved completely due to the lower incipient melting temperature caused by the formation of ***,the M3B2borides were found to be enriched with indispensable strengthening elements Cr,Mo,W and Re,and this may lower the strengthening effect and cause stress concentration during high temperature creep.

关键词： Minor boron Single crystal superalloys M3B2borides Creep properties

Microfluidic fabrication of water-in-water droplets encapsulated in hydrogel microfibers

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Chinese Chemical Letters 2019年第2期30卷 457-460页

作者： chenguang Liu Wenchen Zheng Ruoxiao Xie Yupeng Liu Zhe Liang Guoan luo Mingyu Ding Qionglin Liang Key Laboratory of Chemical Biology (Ministry of Education) Beijing Key Laboratory of Microanalytical Methods ξ Instrumentation Department of Chemistry Tsinghua University State Key Laboratory of Quality Research in Chinese Medicine Macao Institute for Applied Research in Medicine and Health Macao University of Science and Technology

Aqueous microdroplets are of significant interest in biological fields, while the employment of water-inoil (w/o) emulsion and lack of spatial control precluded its widespread application. Herein a novel microfluidic approach is developed to generate water-in-water (w/w) microdroplets embedded in hydrogel microfibers. Aqueous two phase system (ATPS) is applied to generate w/w droplets, and alginate is introduced to continuous phase to form microfibers, which offers spatial restriction and manipulation possibility to droplets. The size and pattern of aqueous droplets can be precisely controlled, and immobilization within hydrogel fiber facilitates easy manipulation and observation. The microdroplets surrounded by hydrophilic environment can act as a cell-cell interaction model, and their potential for biological and environmental applications are demonstrated by long-term culture of encapsulated cells and water remediation of Bacillus subtilis.

关键词： Microfluidics Water-in-water droplets Droplet fibers Intercellular communication Water remediation

Plasmonically engineered light-matter interactions in Aunanoparticle/MoS_(2) heterostructures for artificial optoelectronic synapse

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Nano Research 2022年第4期15卷 3539-3547页

作者： Zhuoran luo Yunfei Xie Ziwei Li Yajuan Wang Lihui Li Ziyu luo chenguang Zhu Xin Yang Ming Huang Jianhua Huang Delang Liang Xiaoli Zhu Dong Li Anlian Pan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province College of Materials Science and EngineeringHunan UniversityChangsha 410082China State Key Laboratory of Artificial Microstructure&Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100084China

Optoelectronic synaptic elements are emerging functional devices for the vigorous development of advanced neuromorphic computing technology in the post-Moore ***,optoelectronic devices based on transition metal dichalcogenides(TMDs)are limited to their poor mobilities and weak light-matter interactions,which still hardly exhibit superior device performances in the application of artificial ***,we demonstrate the successful fabrication of Au nanoparticle-coupled MoS_(2)heterostructures via chemical vapor deposition(CVD),where the light absorption of MoS_(2)is greatly enhanced and engineered by plasmonic *** electrons are excited from Au nanoparticles,and then injected into MoS_(2)semiconductors under the light *** plasmonically-engineered photo-gating effect at the metal-semiconductor junction is demonstrated to create optoelectronic devices with excellent synaptic behaviors,especially in ultra-sensitive excitatory postsynaptic current(EPSC,9.6×10^(-3)nA@3.4 nW·cm^(-2)),ultralow energy consumption(34.7 pJ),long-state retention time(>1,000 s),and tunable synaptic plasticity *** material system of Au-nanoparticles coupled TMDs presents unique advantages for building artificial synapses,which may lead the future development of neuromorphic electronics in optical information sensing and learning.

关键词： synapse optoelectronic device surface plasmon photo-gating MoS_(2)