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Molecular understanding of cation effects on double layers and their significance to CO-CO dimerization

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National Science Review 2023年第9期10卷 125-135页

作者： jia-bo Le Ao Chen Yongbo Kuang Jun Cheng Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences State Key Laboratory of Physical Chemistry of Solid Surfaces iChEM College of Chemistry and Chemical EngineeringXiamen University Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM)

Cation effects have been shown in numerous experiments to play a significant role in electro *** understand these effects at the molecular level,we systematically investigate the structures and capacitances of electric double layers with a variety of cations as counter charges at Pt(111)-COad/water interfaces with ab initio molecular *** is encouraging to find that the computed Helmholtz capacitances for different cations are in quantitative agreement with experiments,and that the trend of cation effects on capacitances shows clear correlation with the structures of interface cations of differing sizes and hydration *** importantly,we demonstrate the Helmholtz capacitance as the key descriptor for measuring the activity of CO-CO dimerization,the rate-determining step for C2+formation in electroreduction of CO and *** work provides atomistic insights into cation effects on electric double layers and electrocatalysis that are crucial for optimizing electrode and electrolyte materials.

关键词： cation effect electrocatalysis electric double layer CO-CO dimerization ab initio molecular dynamics

A highly efficient La-modified ZnAl-LDO catalyst and its performance in the synthesis of dimethyl carbonate from methyl carbamate and methanol

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Chinese Journal of Chemical Engineering 2023年第9期61卷 9-23页

作者： Mingxue Yin bo jia Kuiyi You bo Jin Yangqiang Huang Xiao Luo Zhiwu Liang College of Chemistry and Chemical Engineering the Engineering Research Center of Advanced CatalysisMinistry of EducationHunan UniversityChangsha 410082China College of Chemical Engineering Xiangtan UniversityXiangtan 411105China

In this paper,the highly efficient ZnAlLa layered double oxide(ZnAlLa-LDO)catalyst was evaluated and used in methyl carbamate(MC)alcoholysis synthesis of dimethyl *** optimal conditions,the MC conversion was 33.5% and the dimethyl carbonate(DMC)selectivity was up to 92,4% at 443 K and in 9 *** prepared catalysts were well characterized to investigate the effect on the catalytic performance and reaction catalysis *** experimental results show that the addition of La adjusted the structure and chemical properties of ZnAl composite oxide and that the synergistic effect among Zn,Al and La play a key role in adjusting the acid-base properties and stability of the catalyst,which definitely improved the DMC selectivity and catalytic *** on the proposed reaction mechanism,two kinetic models of the catalytic reaction were established and modified:LangmuirHinshelwood and power-rate law kinetic *** good agreement between kinetic models and experimental data showed that the power-rate law kinetic model based on the elementary reactions is a suitable model for providing a theoretical *** pre-exponential factor and activation energy of the main reaction are 5.77×10^(7)and 77.60 kJ·mol^(-1),respectively.

关键词： Methanol Urea alcoholysis Dimethyl carbonate Kinetic model

Thermal conductivity behavior of SPS consolidated AlN/Al composites for thermal management applications

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Rare Metals 2011年第2期30卷 189-194页

作者： DUN bo jia Xian jia Chengchang CHU Ke School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China General Research Institute for Nonferrous Metals Beijing 100088 China

A1N/A1 composites are a potentially new kind of thermal management material for electronic packaging and heat sink applications. The spark plasma sintering （SPS） technique was used for the first time to prepare the A1N/A1 composites, and attention was focused on the effects of sintefing parameters on the relative density, microstructure and, in particular, thermal conductivity behavior of the composites. The results showed that the relative density and thermal conductivity of the composites increased with increasing sintering temperature and pressure. The composites sintered at 1550℃ for 5 min under 70 MPa showed the maximum relative density and thermal conductivity, corresponding to 99% and 97.5 W.m-1.K-1, respectively. However, the thermal conductivity of present A1N/A1 composites is still far below the theoretical value. Possible reasons for this deviation were discussed.

关键词： metallic matrix composites aluminum nitride spark plasma sintering density thermal conductivity

Static Recrystallization Kinetics Model After Hot Deformation of Low-Alloy Steel Q345B

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Journal of Iron and Steel Research International 2010年第8期17卷 61-66页

作者： MA bo PENG Yan jia Bin LIU Yun-fei State Key Laboratory of Metastable Materials Science and Technology Engineering Research Center of Rolling Equipmentand Complete Technology of Ministry of EducationYanshan UniversityQinhuangdao 066004HebeiChina

The static recrystallization behavior of low-alloy steel Q345B during double-pass hot compression deformation tests was investigated in the temperature range of 900-1000 ℃,the true strain range of 0.15-0.25 and the interpass time range of 0.5-50 s on Gleeble-3500 thermo-simulation *** results show that static recrystallization during the interpass time is *** the deformation temperature and strain increase,softening caused by static recrystallization is *** to the analysis and calculation of thermo-simulation data,the static recrystallization activation energy was obtained and static recrystallization kinetics model was ***,the error analysis of static recrystallization kinetics model proved that the model had good ***,this model provides a theoretical basis for static recrystallization（SRX）and will contribute to the development of multipass hot rolling process,in order to control the rolling process more accurately.

关键词： Gleeble-3500 low-alloy steel static recrystallization activation energy kinetics model

Excessive Intake of Gardenia Pigments Requires Vigilance against Accumulation Risk

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Chinese Journal of Integrative Medicine 2022年第6期28卷 545-546页

作者： HE Ting-ting XIAO Xiao-he WANG jia-bo Senior Department of Hepatology the Fifth Medical Center of Chinese PLA General HospitalBeijing100039China School of Traditional Chinese Medicine Capital Medical UniversityBeijing100069China

Gardenia pigments are widely used as additives in food and consequently people suffer from daily overexposure to these pigments,especially in case they consume dietary supplements that use derivatives of Gardenia *** have observed a very unusual adverse reaction clinically,due to herbal and dietary supplement consumption,characterized by bluegreen pigmentation around the eyes(i.e.a distinctive"gardenia blue"facial appearance).

关键词： unusual consequently herbal

Electrochemical oxidation of Rhodamine B with cerium and sodium dodecyl benzene sulfonate co-modified Ti/Pb0_(2)electrodes:Preparation,characterization,optimization,application

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Chinese Journal of Chemical Engineering 2021年第4期34卷 191-202页

作者： Zhen Wei Xuanqi Kang Shangyuan Xu Xiaokang Zhou bo jia Qing Feng Xi'an TaiJin Industrial Electrochemical Technology CO. LtdXi'an 710016China Key Laboratory of Porous Metal Materials Shaanxi Institute for Materials EngineeringNorthwest Institute for Non-ferrous Metal ResearchXi'an 710016China

Regulation of the electronic structure and interface property becomes a major strategy in the preparation of *** paper reports the synthesis of cerium(Ce)and sodium dodecyl benzene sulfonate(SDBS)comodified Ti/Pbo_(2)electrodes(Ti/Pbo2CeSDBS).Ce and SDBS could greatly change the electronic structure and interface property of ***/Pbo_(2)CeSDBS exhibited excellent electrocatalytic activity and stability in Rhodamine B(RhB)electrocatalytic oxidation *** improved electrocatalytic activity associates with the synergistic effect of electronic and interface *** the electrochemical degradation of RhB,the removal efficiencies of RhB and COD are about 0.880 and 0.694 respectively after the electrolysis of 220 min with Ti/Pbo_(2)Ce4SDBS40,which are higher than the contrast Ti/Pbo_(2)*** the meantime,the accelerated lifetime of Ti/Pbo_(2)Ce4SDBS40 is more than 6.2 times than that of Ti/Pbo_(2).

关键词： Ti/Pbo_(2)electrodes Electrocatalytic oxidation

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微生物菌群调控人畜共患结核病的研究进展

动物医学进展 2025年第1期46卷 91-96页

作者：许霄峰张广智鑫婷叶建新张建伟贾丽钱佳豪温贺飞吴慧光蒋卉丁家波中国农业科学院北京畜牧兽医研究所北京100097 农业农村部动物生物安全风险预警及防控重点实验室(北方) 北京100193 扬州大学兽医学院江苏扬州225009 北京市畜牧总站北京100193 河北农业大学动物医学院河北保定071000 河北省遵化市农业农村局河北唐山064200

目前,人畜共患结核病(zTB)仍是世界上最重要的细菌传染性疫病之一,严重威胁人和动物健康以及公共卫生安全。机体数量庞大的微生物菌群积极参与着机体的发育、免疫调控、代谢等。研究发现微生物菌群和zTB的发生、发展、治疗、疫苗免疫具... 详细信息

目前,人畜共患结核病(zTB)仍是世界上最重要的细菌传染性疫病之一,严重威胁人和动物健康以及公共卫生安全。机体数量庞大的微生物菌群积极参与着机体的发育、免疫调控、代谢等。研究发现微生物菌群和zTB的发生、发展、治疗、疫苗免疫具有紧密的相关性,现已成为诸多领域中的研究热点。菌群对zTB进程的调控可通过诸多途径直接或间接地进行,如菌群稳态、代谢物及对免疫的调控等。基于此,论文综述了目前微生物菌群与zTB相关研究的最新进展,重点讨论了肠道菌群和肺部菌群与zTB的关联及调节机制,分析了肠-肺轴相互作用、菌群代谢产物对zTB的影响,探讨了通过调节宿主的菌群组成和功能对预防和辅助治疗结核病的潜在价值,旨在为zTB防控提供理论基础和借鉴。

关键词：人畜共患结核病肠道微生物菌群肠-肺轴益生菌

Electromagnetic Analysis and Optimization of High-speed Maglev Linear Synchronous Motor Based on Field-circuit Coupling

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CES Transactions on Electrical Machines and Systems 2022年第2期6卷 118-123页

作者： Junci Cao Xiaoqing Deng Dong Li bo jia Department of School of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044China Shandong Power Equipment Co. LtdJinan 250022China

High speed maglev train has become a new non-contact transportation mode mainly studied in recent years because of its non-sticking and high speed ***,the finite element model of the long stator linear synchronous motor(LSM)is established based on the structure of the test *** calculation,it is compared with the experimental data and *** this basis,a field-circuit coupling model based on inverter circuit is established,and the influence of carrier wave ratio change on the output characteristics of LSM is calculated and ***,the filter circuit is introduced into the field-circuit coupling model,and the influence of the filter circuit on the output characteristics of the LSM is compared and analyzed.

关键词： High-speed maglev Linear synchronous motor Finite element method Carrier wave ratio Filter circuit

Looper-Tension Sliding Mode Control for Hot Strip Finishing Mills

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Journal of Iron and Steel Research International 2012年第1期19卷 23-30页

作者： ZHONG Zhao-zhun WANG Jing-cheng ZHANG jian-min LI jia-bo Department of Automation Key Laboratory of System Control and Information Processing of Ministry of Education Shanghai Jiaotong University Shanghai 200240 China Baosteel Research Institute Baoshan Iron and Steel Co Ltd Shanghai 201900 China

An innovative sliding mode controller for looper and tension control in hot strip finishing mills was developed based on approximately linearized model. Firstly, a fictitious controller of the reduced order subsystem was designed according to desired dynamics, by which, the angle and tension loops were decoupled on the sliding manifold. Then, a sliding mode controller was used to validate finite time convergence of the state vector to the manifold which guaranteed the stability and performances of the overall system. This solution was considered owing to its well- known robustness and simplicity characteristics concerning disturbances and unmodelled dynamics. Simulation results showed the effectiveness of the proposed controller compared with conventional ones.

关键词： sliding mode control looper control tension control hot strip finishing mill