检索结果-南通市图书馆

Supramolecular Macrocycle Regulated Single-Atom MoS2@Co Catalysts for Enhanced Oxygen Evolution Reaction

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第5期7卷 287-295页

作者： Shuai Cao Wenzhuo Wu Chaozhong liu Leqian Song Qun Xu Huacheng Zhang Yanli Zhao School of Chemical Engineering and Technology Xi’an Jiaotong University Henan Institute of Advanced Technology Zhengzhou University Department of Materials Science and Engineering Zhengzhou University School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University

The development of active water oxidation catalysts for water splitting has stimulated considerable interest. Herein, the design and building of single atom Co sites using a supramolecular tailoring strategy are reported, that is,the introduction of pillar[4]arene[1]quinone （P4A1Q） permits mononuclear Co species stereoelectronically assembled on MoS2matrix to construct an atomically dispersed MoS2@Co catalyst with modulated local electronic structure, definite chemical environment and enhanced oxygen evolution reaction performance. Theoretical calculations indicate that immsobilized single-Co sites exhibit an optimized adsorption capability of oxygencontaining intermediates, endowing the catalyst an excellent electrocatalytic oxygen evolution reaction activity, with a low overpotential of 370 mV at10 mA cm-2and a small Tafel slope of 90 mV dec-1. The extendable potential of this strategy to other electrocatalysts such as MoS2@Ni and MoS2@Zn, and other applications such as the hydrogen evolution reaction was also demonstrated. This study affords new insights into the rational design of single metal atom systems with enhanced electrocatalytic performance.

关键词： electrocatalysis oxygen evolution reaction pillararenequinone single atoms transition-metal dichalcogenides

Distributed Secondary Control Based on Dynamic Diffusion Algorithm for Current Sharing and Average Voltage Regulation in DC Microgrids

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 597-607页

作者： Dawei Liao Fei Gao Daniel J.Rogers Wentao Huang Dong liu Houjun Tang Department of Electrical Engineering Shanghai Jiao Tong UniversityShanghaiChina Department of Engineering Science University of OxfordOxford OX12JDU.K. IEEE

This paper introduces a distributed secondary control scheme for achieving current sharing and average voltage regulation objectives in a DC *** proposed scheme employs a dynamic diffusion algorithm(DDA)instead of the consensus algorithm to enable distributed communication among *** help understand DDA,the relation of DDA and other diffusion algorithms is discussed in detail and its superiority is shown by comparison with diffusion and consensus ***,considering the discrete nature and different sampling time of the digital controller and communication network,a z-domain model of the entire DC microgrid is *** influence of communication and secondary control parameters on the system stability is *** on the established model,the tolerable communication rates are ***-time simulations conducted on the OPAL-RT platform validate the effectiveness of the proposed scheme,showcasing its advantages in terms of convergence speed and stability.

关键词： Cooperative control DC microgrid diffusion algorithm discrete-time modeling distributed secondary control

Constructing Ce-Mn/Al_(2)O_(3)with different active components for low temperature catalytic degradation of chlorobenzene in soil

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第10期42卷 1873-1881页

作者： Tianyu Sun Mutao Xu Xuelu Meng Tiantian liu Qijie Jin Chengzhang Zhu Haitao Xu School of Environmental Science and Engineering Nanjing Tech UniversityNanjing210009China College of Materials Science and Engineering Nanjing Tech UniversityNanjing20009Chin

Soil remediation containing numerous organic contaminants is of great significance to ecological ***,the synergetic effects of Ce-Mn/Al_(2)O_(3)with different active components on catalytic thermal desorption of chlorobenzene in soil were *** optimized Ce-Mn/Al_(2)O_(3)drastically enhance the desorption efficiency of chlorobenzene,and the corresponding conversion reaches 100%within 1 h at a low temperature of 120℃.The superior performance is ascribed to the formation of Ce-Mn solid solution during the calcination process,resulting in a certain lattice change to the generation of abundant oxygen vacancies and acidic *** with the analysis of in-situ diffuse reflectance infrared spectroscopy and gas chromatography-mass spectrometry,the final products of chlorobenzene are decomposed into CO_(2),H_(2)O,Cl_(2)and *** work sheds light on the rational design of highly-active catalysts for practical applications of sustainable soil remediation.

关键词： Ce-Mn/Al_(2)O_(3) Soil Thermal desorption Low temperature Degradation pathway Rare earths

CFD-PBM coupled modeling of the liquid-liquid dispersion characteristics and structure optimization for Kenics static mixer

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第6期70卷 173-188页

作者： Junhai Deng Shilin Lan Juchang Wu Shenghua Du Weidong liu Luchang Han Yefeng Zhou National&Local United Engineering Research Centre for Chemical Process Simulation and Intensification Chemical Process Simulation and Optimization Engineering Research Center of Ministry of EducationXiangtan UniversityXiangtan 411105China Hunan Haili Chemical Industry Company Limited Changsha 410000China

Kenics static mixers(KSM)are extensively used in industrial mixing-reaction processes by virtue of high mixing efficiency,low power homogenization and easy continuous *** liquid droplet size and its distribution and thus revealing the dispersion characteristics are of great significance for structural optimization and process intensification in the *** this work,a computational fluid dynamics-population balance model(CFD-PBM)coupled method is employed to systematically investigate the effects of operating conditions and structural parameters of KSM on droplet size and its distribution,to further reveal the liquid-liquid dispersion *** indicate that higher Reynolds numbers or higher dispersed phase volume fractions increase energy dissipation,reducing Sauter mean diameter(SMD)of dispersed phase droplets and with a shift in droplet size distribution(DSD)towards smaller *** aspect ratios,greater blade twist and assembly angles amplify shear rate,leading to smaller droplet size and a narrower DSD in the smaller *** degree of impact exerted by the aspect ratio is notably ***,mixing elements with different spin enhance shear and stretching *** to the same spin,SMD becomes 3.7-5.8 times smaller in the smaller size range with a significantly narrower *** into account the pressure drop and efficiency in a comprehensive manner,optimized structural parameters for the mixing element encompass an aspect ratio of 1-1.5,a blade twist angle of 180°,an assembly angle of 90°,and interlaced assembly of adjacent elements with different *** work provides vital theoretical underpinning and future reference for enhancing KSM performance.

关键词： CFD Population balance Liquid-liquid dispersion Kenics static mixer

Microphase Separation of Semiflexible Ring Diblock Copolymers

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第2期42卷 267-276,I0011页

作者： Dan-Yan Qin Sheng-Da Zhao Zhi-Xin liu Jing Zhang Xing-Hua Zhang School of Physical Science and Engineering Beijing Jiaotong UniversityBeijing100044China

Aiming at the difficult problem of solving the conformation statistics of complex polymers, this study presents a novel and concise conformation statistics theoretical approach based on Monte Carlo and Neural Network method. This method offers a new research idea for investigating the conformation statistics of complex polymers, characterized by its simplicity and practicality. It can be applied to more complex topological structure, more higher degree of freedom polymer systems with higher dimensions, theory research on dynamic self-consistent field theory and polymer field theory, as well as the analysis of scattering experimental data. The conformation statistics of complex polymers determine the structure and response properties of the system. Using the new method proposed in this study, taking the semiflexible ring diblock copolymer as an example, Monte Carlo simulation is used to sample this ring conformation to construct the dataset of polymer. The structure factor describing conformation statistics are expressed as continuous functions of structure parameters by neural network supervised learning. This is the innovation of this work. As an application, the structure factors represented by neural networks were introduced into the random phase approximation theory to study the microphase separation of semiflexible ring diblock copolymers. The influence of the ring's topological properties on the phase transition behavior was pointed out.

关键词： Ring copolymer Diblock copolymers Semiflexible The order-disorder transition

Monocular 3D gaze estimation using feature discretization and attention mechanism

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2023年第5期19卷 301-306页

作者： SHA tong SUN Jinglin PUN Siohang liu yu School of Microelectronics Tianjin UniversityTianjin 300072China Institute of Microelectronics University of MacaoMacao 999078China

Gaze estimation has become an important field of image and information *** gaze from full-face images using convolutional neural network(CNN) has achieved fine ***,estimating gaze from eye images is very challenging due to the less information contained in eye images than in full-face images,and it’s still vital since eye-image-based methods have wider *** this paper,we propose the discretization-gaze network(DGaze-Net) to optimize monocular three-dimensional(3D) gaze estimation accuracy by feature discretization and attention *** gaze predictor of DGaze-Net is optimized based on feature *** discretizing the gaze angle into K bins,a classification constraint is added to the gaze *** the gaze predictor,the gaze angle is pre-applied with a binned classification before regressing with the real gaze angle to improve gaze estimation *** addition,the attention mechanism is applied to the backbone to enhance the ability to extract eye features related to *** proposed method is validated on three gaze datasets and achieves encouraging gaze estimation accuracy.

关键词： estimation mechanism discretization

在线全文

学校读者我要写书评

暂无评论

中国医患纠纷关注度时空差异特征及影响因素

中国管理科学 2024年第8期32卷 322-334页

作者：刘举胜邱志萍于长锐上海政法学院经济管理学院上海201701 上海财经大学信息管理与工程学院广东东莞523106 上海金融智能工程技术研究中心上海200433 东莞理工学院经济与管理学院上海200433 上海财经大学城市与区域科学学院上海200433

基于2011—2019年省级医患纠纷百度指数,本文采用Dagum基尼系数、核密度估计和空间自相关刻画医患纠纷关注度的时空差异特征,并借助面板数据模型OLS估计方法和Oaxaca-Blinder分解法实证研究医患纠纷关注度演化的驱动因素及差异来源。结... 详细信息

基于2011—2019年省级医患纠纷百度指数,本文采用Dagum基尼系数、核密度估计和空间自相关刻画医患纠纷关注度的时空差异特征,并借助面板数据模型OLS估计方法和Oaxaca-Blinder分解法实证研究医患纠纷关注度演化的驱动因素及差异来源。结果表明:我国医患纠纷关注度整体有所上升,在空间上呈现自东向西递减且愈加明显的非均衡格局;省际差异是关注与非均衡的主要来源,其中东-西部差异最大,东北-中部最小;关注度存在显著的空间关联性特征,形成以长三角及闽鲁豫为高-高型关注度“俱乐部”;居民文化素养、病患负担、社会治理水平、信息化、经济发展水平和媒体报道次数均显著提升医患纠纷关注度,而地理距离产生显著抑制影响。上述结论在剔除极端样本和空间计量分析等稳健性检验后仍成立。此外,社会治理水平和病患负担是导致关注度地区差异与关注度水平差异的主要来源。本研究为正确引导与管理医患纠纷舆情传播提供政策启示。

关键词：医患纠纷关注度时空差异特征影响因素 Oaxaca-Blinder分解

Effect of Chinese Medicine in Patients with COVID-19: A Multi-center Retrospective Cohort Study

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2024年第11期30卷 974-983页

作者： ZHAO Guo-zhen YAN Shi-yan LI Bo GUO yu-hong SONG Shuang HU Ya-hui GUO Shi-qi HU Jing DU yuan LU Hai-tian YE Hao-ran REN Zhi-ying ZHU Ling-fei XU Xiao-long SU Rui liu Qing-quan Beijing Hospital of Traditional Chinese Medicine Capital Medical University Beijing Institute of Traditional Chinese Medicine School of Clinical Medicine Beijing University of Chinese Medicine School of Acupuncture-Moxibustion and Tuina Beijing University of Chinese Medicine College of Integrated Chinese Medicine Tianjin University of Traditional Chinese Medicine

Objective: To evaluate the effectiveness and safety of Chinese medicine(CM) in the treatment of coronavirus disease 2019(COVID-19) in China. Methods: A multi-center retrospective cohort study was carried out, with cumulative CM treatment period of 3 days during hospitalization as exposure. Data came from consecutive inpatients from December 19, 2019 to May 16, 2020 in 4 medical centers in Wuhan, China. After data extraction, verification and cleaning, confounding factors were adjusted by inverse probability of treatment weighting(IPTW), and the Cox proportional hazards regression model was used for statistical analysis. Results:A total of 2,272 COVID-19 patients were included. There were 1,684 patients in the CM group and 588 patients in the control group. Compared with the control group, the hazard ratio(HR) for the deterioration rate in the CM group was 0.52 [95% confidence interval(CI): 0.41 to 0.64, P<0.001]. The results were consistent across patients of varying severity at admission, and the robustness of the results were confirmed by 3 sensitivity analyses. In addition, the HR for all-cause mortality in the CM group was 0.29(95% CI: 0.19 to 0.44, P<0.001).Regarding of safety, the proportion of patients with abnormal liver function or renal function in the CM group was smaller. Conclusion: This real-world study indicates that the combination of a full-course CM therapy on the basic conventional treatment, may safely reduce the deterioration rate and all-cause mortality of COVID-19patients. This result can provide the new evidence to support the current treatment of COVID-19. Additional prospective clinical trial is needed to evaluate the efficacy and safety of specific CM interventions.(Registration No. ChiCTR2200062917)

关键词： Chinese medicine all-cause mortality cohort study coronavirus disease 2019 deterioration rate

Rapid surface texturing to achieve robust superhydrophobicity,controllable droplet impact,and anti-frosting performances

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Friction 2024年第2期12卷 291-304页

作者： Qingwen DAI Lei CHEN Jiabao PAN Liping SHI Dameng liu Wei HUANG Xiaolei WANG College of Mechanical and Electrical Engineering Nanjing University of Aeronautics&AstronauticsNanjing 210016China State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China School of Mechanical Engineering Anhui Polytechnic UniversityWuhu 241000China School of Mechanical Engineering Anhui University of TechnologyMa’anshan 243032China

Robust superhydrophobic surfaces with excellent capacities of repelling water and anti-frosting are of importance for many mechanical *** this work,wear-resistant superhydrophobic surfaces were fabricated by curing a mixture of polyurethane acrylate(PUA)coating and 1H,1H,2H,2H-Perfluorodecyltrichlorosilane(HFTCS)on titanium alloy(TC4)surfaces decorated with micropillars pattern,thus,composite functional surfaces with PUA coating in the valleys around the micropillars pattern of TC4 were *** contact angle on fabricated surfaces could reach 167°.Influences of the geometric parameters of micropillars pattern on the apparent contact angle were investigated,and the corresponding wear-resistant property was *** impact and anti-frosting performances on the prepared surfaces were *** optimized design of surface texture with robust superhydrophobicity,controllable droplet impact,and anti-frosting performances was *** design principle is of promising prospects for fabricating superhydrophobic surfaces in traditional mechanical systems.

关键词： surface texture robust superhydrophobic wear-resistant droplet impact anti-frosting