检索结果-内蒙古大学图书馆

Behavior and mechanism of pre-oxidation improvement on fluidization in the fluidized reduction of titanomagnetite

International Journal of Minerals,Metallurgy and Materials 2024年第11期31卷 2458-2465页

作者： Haoyan Sun Ajala Adewole Adetoro Zhiqiang Wang Qingshan Zhu State Key Laboratory of Mesoscience and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China Data Science AI modeling CentreUniversity of HullHull HU67RXUK

The direct reduction process is an important development direction of low-carbon ironmaking and efficient comprehensive utilization of poly-metallic iron ore,such as ***,the defluidization of reduced iron particles with a high metallization degree at a high temperature will seriously affect the operation of fluidized bed *** the pre-oxidation enhancing reduction and the particle surface modification of titanomagnetite,the behavior and mechanism of pre-oxidation improvement on fluidization in the fluidized bed reduction of titanomagnetite are systematically studied in this ***-oxidation treatment of titanomagnetite can significantly lower the critical stable reduction fluidization gas velocity to 0.17 m/s,which is reduced by 56%compared to that of titanomagnetite reduction without pre-oxidation,while achieving a metallization degree of>90%,Corresponding to the different reduction fluidization behaviors,three pre-oxidation operation regions have been divided,taking oxidation degrees of 26%and 86%as the *** on the particle surface morphology evolution in the pre-oxidation-reduction process,the relationship between the surface morphology of pre-oxidized ore and the reduced iron with fluidization properties is *** improving method of pre-oxidation on the reduction fluidization provides a novel approach to prevent defluidization by particle surface modification,especially for the fluidized bed reduction of poly-metallic iron ore.

关键词： fluidization direct reduction pre-oxidation titanomagnetite iron whisker

来源：评论

学校读者我要写书评

暂无评论

Hollow Multishelled Structural Li-rich Cathode with AI Doping Enabling Capacity and Voltage Stabled Li-ion Batteries

引用

高等学校化学研究（英文版） 2023年第4期39卷 630-635页

作者： ZHAO Xiaolang YANG Mei WANG Jiangyan WANG Dan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China Qingdao University of Science and Technology College of Chemistry and Molecular EngineeringQingdao 266061P.R.China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049P.R.China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China Qingdao University of Science and Technology College of Chemistry and Molecular EngineeringQingdao 266061P.R.China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049P.R.China

Li-rich layered oxide cathode materials have drawn great attention due to their high specific capacity and relatively low ***,their implementation is hindered by capacity and discharge voltage decay as well as poor rate ***,by combining the concepts of geometrical and atomic structure design,hollow multishelled structural Li-rich cathode material doped with aluminum element(Li-rich HoMS-AI)is developed to solve the above ***-rich HoMS-AI is synthesized through a facile sequential templating approach with the shell number,element molar ratio and AI doping amount accurately *** can effectively buffer the stress/strain during cycling,as well as shorten the ion and electron diffusion path,while AI doping can inhibit the phase transition of the material and reduce the surface oxygen *** a result,it achieved a high specific capacity,stable voltage and capacity during cycling,exhibiting an initial discharge specific capacity up to 300.6 mA·h·g-1 at 0.1 C(1 C=300 mA/g)and maintaining 246.3 mA·h·g-1 after 100 cycles.

关键词： Li-rich layered oxide Hollow multishelled structure Aluminum doping Specific capacity Cycling stability

来源：评论

学校读者我要写书评

暂无评论

Tuning the atomic configuration environment of MnN_(4) sites by Co cooperation for efficient oxygen reduction

引用

Journal of Energy Chemistry 2023年第7期82卷 547-559,I0012页

作者： Jing Wang Haihong Zhong Jun Yang Huiyu Li Pinggui Tang Yongjun Feng Dianqing Li State Key Laboratory of Chemical Resource Engineering Beijing Engineering Center for Hierarchical CatalystsCollege of ChemistryBeijing University of Chemical TechnologyBeijing 100029China College of Science Hainan UniversityHaikou 570228HainanChina State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Carbon-based N-coordinated Mn(Mn-N_(x)/C)single-atom electrocatalysts are considered as one of the most desirable non-precious oxygen reduction reaction(ORR)candidates due to their insignificant Fenton reactivity,high abundance,and intriguing electrocatalytic ***,current MnN_(x)/C single-atom electrocatalysts suffer from high overpotentials because of their low intrinsic activity and unsatisfactory chemical ***,through an in-situ polymerization-assisted pyrolysis,the Co as a second metal is introduced into the Mn-N_(x)/C system to construct Co,Mn-N_(x)dual-metallic sites,which atomically disperse in N-doped 1D carbon nanorods,denoted as Co,Mn-N/CNR and *** electron microscopy and X-ray absorption spectroscopy(XAS)techniques,we verify the uniform dispersion of CoN4and MnN4atomic sites and confirm the effect of Co doping on the MnN_(4) electronic *** functional theory(DFT)calculations further elucidate that the energy barrier of ratedetermining step(^(*)OH desorption)decreases over the 2 N-bridged MnCoN_(6) moieties related to the pure MnN_(4).This work provides an effective strategy to modulate the local coordination environment and electronic structure of MnN_(4) active sites for improving their ORR activity and stability.

关键词： Dual-atom sites Oxygen reduction reaction M-Nx/C catalysts Coordination environment Electronic structure Synergistic effect

来源：评论

学校读者我要写书评

暂无评论

Reinforcement learning for optimal tracking of large-scale systems with multitime scales

引用

Science China(Information Sciences) 2023年第7期66卷 5-29页

作者： Jinna LI Hao NIE Tianyou CHAI Frank L.LEWIS School of Information and Control Engineering Liaoning Petrochemical University State Key Laboratory of Synthetical Automation for Process Industries Northeastern University UTA Research Institute University of Texas at Arlington

This paper aims to solve an optimal tracking control(OTC) problem of large-scale systems with multitime scales and coupled subsystems using singular perturbation(SP) theory and reinforcement learning(RL) techniques. A considerable contribution of this paper is the development of a data-driven SP-based RL method for the OTC of unknown large-scale systems with multitime scales. To achieve this, a multitime scale tracking problem was decomposed into a linear quadratic tracker problem for slow subsystems and a dynamical game problem for fast subsystems using the SP theory. Then, the distributed composite feedback controllers were found using a distributed off-policy integral RL algorithm that uses only measured data from the system in real time. Thus, the operational index can follow its prescribed target value via an approximately optimal approach. Theoretical analysis and proof are presented to demonstrate that the sum of the performances of reduced-order subsystems is approximately equal to the performance of the original large-scale system. Finally, numerical and practical examples are provided to validate the effectiveness of the proposed method.

关键词： reinforcement learning singular perturbation multitime scales data-driven control

来源：评论

学校读者我要写书评

暂无评论

Machine learning-based solubility prediction and methodology evaluation of active pharmaceutical ingredients in industrial crystallization

引用

Frontiers of Chemical Science and engineering 2022年第4期16卷 523-535页

作者： Yiming Ma Zhenguo Gao Peng Shi Mingyang Chen Songgu Wu Chao Yang Jing-Kang Wang Jingcai Cheng Junbo Gong School of Chemical Engineering and Technology State Key Laboratory of Chemical EngineeringTianjin UniversityTianjin 300072China The Co-Innovation Center of Chemistry and Chemical Engineering of Tianjin Tianjin 300072China Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

Solubility has been widely regarded as a fundamental property of small molecule drugs and drug candidates,as it has a profound impact on the crystallization *** prediction,as an alternative to experiments which can reduce waste and improve crystallization process efficiency,has attracted increasing ***,there are still many urgent challenges thus *** we used seven descriptors based on understanding dissolution behavior to establish two solubility prediction models by machine learning *** solubility data of 120 active pharmaceutical ingredients(APIs)in ethanol were considered in the prediction models,which were constructed by random decision forests and artificial neural network with optimized data structure and model ***,a comparison with traditional prediction methods including the modified solubility equation and the quantitative structure-property relationships model was carried *** highest accuracy shown by the testing set proves that the ML models have the best solubility prediction *** linear regression and stepwise regression were used to further investigate the critical factor in determining solubility *** results revealed that the API properties and the solute-solvent interaction both provide a nonnegligible contribution to the solubility value.

关键词： solubility prediction machine learning artificial neural network random decision forests

来源：评论

学校读者我要写书评

暂无评论

Facile and effective synthesis strategy for terbium-doped hydroxyapatite toward photoelectric devices and flexible functional fibers

引用

Rare Metals 2024年第4期43卷 1713-1723页

作者： Xiao-Dong Zhang Kun Nie Zi-Yao Hu Ran-Ran Zhou Xiu-Qiang Duan Wu-Bin Dai Song-Song Nie Song-Jun Yao Luo-Xin Wang Le-Fu Mei Hua Wang Yi-Yi Yao Xiao-Xue Ma Hubei Key Laboratory for New Textile Materials and Applications and State Key Laboratory of New Textile Materials and Advanced Processing Technology School of Materials Science and EngineeringWuhan Textile UniversityWuhan430200China Key Laboratory of Testing and Tracing of Rare Earth Products for State Market Regulation Jiangxi University of Science and TechnologyGanzhou341000China Hubei Key Laboratory of Plasma Chemistry and Advanced Materials and Key Laboratory of Green Chemical Engineering Process of Ministry of Education Wuhan Institute of TechnologyWuhan430205China

As a material with good biocompatibility,hydroxyapatite(HAP)can have optical properties after doping with various rare earth *** a biocompatible fluorescent material,doped HAP could have broad applications in biological probes,drug delivery,optoelectronic materials,fluorescence anti-counterfeiting,and other *** this paper,we put forward the preparation of HAP doped with terbium(Ⅲ)ions(Tb^(3+))by hydrothermal *** controlling the Tb^(3+)doping content in reaction and the reaction time,the changes in HAP's structure,morphology,and luminescence properties under different conditions were *** the doping amount of Tb^(3+)reached an optimal value,the dipole-quadrupole would occur and the concentration would be *** control experiment showed that the optimal Tb3+content was 7.5×10^(-5)mol,which showed the best fluorescence ***,a non-luminous material,was rarely used in the field of fluorescent anti-counterfeiting and photoelectric *** proposed to prepare a luminescent aramid/polyphenylene sulfide(ACFs/PPS)fiber paper and a new light-emitting diode(LED)using the Tb-doped HAP *** composite sample exhibited an excellent stability and fluorescence performance,which also demonstrated a possibility of HAP applications in anticounterfeiting and *** introduction of Tb3+dopant HAP was done to give HAP optical properties and broaden the application range of HAP.

关键词： Hydroxyapatite Rare earth luminescence Photoelectric device Aramid Polyphenylene sulfide fiber paper Luminescent fiber

来源：评论

学校读者我要写书评

暂无评论

Mild photothermal therapy for cancer cell modulation:A transformative approach to regulate cancer cell phenotype and enhance therapeutic outcomes

引用

Journal of Pharmaceutical Analysis 2024年第12期14卷 1728-1731页

作者： Jinyuan Liu Steve Smith Congzhou Wang Nanoscience and Biomedical Engineering South Dakota School of Mines and TechnologyRapid CitySD57701USA State Key Laboratory of Biopharmaceutical Preparation and Delivery Institute of Process EngineeringChinese Academy of SciencesBeijing100190China

*** in cancer metastasis and chemoresistance Cancer metastasis is contingent on the epithelial-mesenchymal transition(EMT)of cancer *** EMT,epithelial cancer cells transform into a mesenchymal phenotype,which endows cancer cells with enhanced migratory and invasive abilities,promoting their dissemination throughout the *** also contributes significantly to chemoresistance,allowing cancer cells to survive and metastasize even after chemotherapy[1].

关键词： epithelial mesenchymal transition mesenchymal phenotypewhich cancer cells mild photothermal therapy chemoresistance cancer metastasis

来源：评论

学校读者我要写书评

暂无评论

Reasonable Designing of Free-standing MnO_(2)/Graphene Composite Membrane for Lithium-ion Storage

引用

Chemical Research in Chinese Universities 2024年第3期40卷 508-512页

作者： SHI Junye YU Chenxi ZOU Zewei ZHENG Shumin ZHANG Xing WANG Bao Institute of Refrigeration and Cryogenics Shanghai Jiao Tong University Shanghai 200433P.R.China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China Key Laboratory of Biopharmaceutical Preparation and Delivery Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China CAS Key Laboratory of Molecular Nanostucture and Nanotechnology Institute of ChemistryChinese Academy of SciencesBeijing 100190P.R.China

Free-standing membranes show extraordinary promise in energy storage applications,however are usually limited by low capacity and poor rate ***,we assembled a series of free-standing MnO_(2)/GO composite membranes with ZIF67 particles embedded between two-dimensional(2D)*** particle size of ZIF67 can be adjusted to achieve tunable interlayer *** lithium storage performance of the as-obtained membranes with different interlayer spaces was systematically *** MnO_(2)/GO composite membrane embedded with ZIF67 particles with an average diameter of 30 nm(denoted as MnO_(2)/nZIF67/GO)delivers a good long cycling performance,and it retains a capacity of 340.7 mA·h·g^(−1) after 400 cycles at 0.05 A/*** MnO_(2)/GO composite membrane embedded with ZIF67 particles with an average diameter of 500 nm(denoted as MnO_(2)/mZIF67/GO)exhibits good rate *** of the size of the ZIF67 particles,the performance of the membrane containing ZIF67 is significantly better than that of the membrane without ZIF67,indicating that the ZIF67 particles can enhance the lithium storage performance of the assembled *** work provides a method to fabricate a free-standing membrane for lithium storage with tunable electrochemical performance.

关键词： Lithium-ion battery Membrane Free-standing ZIF67

来源：评论

学校读者我要写书评

暂无评论

Synthesis Chemistry & Performance Enhancement of Critical Inorganic Functional Materials

引用

Chemical Research in Chinese Universities 2024年第3期40卷 343-345页

作者： WANG Dan YU Ranbo State Key Laboratory of Biochemical Engineering Key Laboratory of Biopharmaceutical Preparation and DeliveryInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science&Technology BeijingBeijing 100083P.R.China

The development of human economy and society relies on the advancement of materials,and the research of advanced materials continuously drives industrial changes,giving rise to a new wave of global scientific and technological *** plays a significant role in the field of materials research and industry,however,the increasing prominence of key strategic materials being controlled by external forces has become a bottleneck issue that hinders national economic and social development as well as national security.

关键词： hinder continuously forces

来源：评论

学校读者我要写书评

暂无评论

Exploring multiple phases and first-order phase transitions in Kármán Vortex Street

引用

Science China(Physics,Mechanics & Astronomy) 2024年第11期67卷 47-54页

作者： Xu Li Xing Xiang Tingting Xue Limin Wang Xiaosong Chen School of Systems Science and Institute of Nonequilibrium Systems Beijing Normal UniversityBeijing 100875China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy ofSciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

Kármán Vortex Street, a fascinating phenomenon of fluid dynamics, has intrigued the scientific community for a long time. Many researchers have dedicated their efforts to unraveling the essence of this intriguing flow pattern. Here, we apply the lattice Boltzmann method with curved boundary conditions to simulate flows around a circular cylinder and study the emergence of Kármán Vortex Street using the eigen microstate approach, which can identify phase transition and its order-parameter. At low Reynolds number, there is only one dominant eigen microstate W_(1) of laminar flow. At Re_(c)^(1)= 53.6, there is a phase transition with the emergence of an eigen microstate pair W^(2,3) of pressure and velocity fields. Further at Re_(c)^(2)= 56, there is another phase transition with the emergence of two eigen microstate pairs W^(4,5) and W^(6,7). Using the renormalization group theory of eigen microstate,both phase transitions are determined to be first-order. The two-dimensional energy spectrum of eigen microstate for W^(1), W^(2,3) after Re_(c)^(1), W^(4-7) after Re_(c)^(2) exhibit-5/3 power-law behavior of Kolnogorov's K41 theory. These results reveal the complexity and provide an analysis of the Kármán Vortex Street from the perspective of phase transitions.

关键词： Kármán Vortex Street first-order phase transition eigen microstate approach renormalization group theory of eigen microstate

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：