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MOFs fertilized transition-metallic single-atom electrocatalysts for highly-efficient oxygen reduction: Spreading the synthesis strategies and advanced identification

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Journal of Energy Chemistry 2022年第4期31卷 391-422页

作者： Kexin Song yu feng Wei Zhang Weitao Zheng State Key Laboratory of Automotive Simulation and Control School of Materials Science&EngineeringKey Laboratory of Automobile Materials MOEElectron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130012JilinChina

Metal-organic frameworks(MOFs) have been widely used in oxygen reduction reaction(ORR) of fuel cells and metal-air batteries, attributed to their unique structures and compositions. Recently, the preparation of transition-metallic single-atom electrocatalysts(TM-SACs) using MOFs as precursors or templates has made great progress. Herein, the development history of SACs prepared based on MOFs and their characterization are overviewed firstly, and then several strategies are summarized for preparing TM-SACs using MOFs and further modification. Finally, the challenges and opportunities confronted by TM-SACs are fully discussed. Consequently, our work can guide the realization of TM-SACs abundant with high activity, high loading and high stability.

关键词： Transition-metallic single-atom electrocatalysts(TM-SACs) Oxygen reduction reaction(ORR) Metal-organic frameworks(MOFs) Electron microscopy Spectroscopy

Symbolic transfer entropy-based premature signal analysis

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Chinese Physics B 2012年第1期21卷 535-538页

作者： Wang Jun yu Zheng-feng Image Processing and Image Communications Key Laboratory School of Geography and Biological InformationNanjing University of Posts&TelecommunicationsNanjing 210003China

In this paper, we use symbolic transfer entropy to study the coupling strength between premature signals. Numerical experiments show that three types of signal couplings are in the same direction. Among them, normal signal coupling is the strongest, followed by that of premature ventricular contractions, and that of atrial premature beats is the weakest. The T test shows that the entropies of the three signals are distinct. Symbolic transfer entropy requires less data, can distinguish the three types of signals and has very good computational efficiency.

关键词： premature signal symbolic transfer entropy signal coupling

Maintenance Therapy for NSCLC: Consensus and Controversy

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Chinese Journal of Cancer Research 2011年第4期23卷 254-258页

作者： Shun Lu Yong‐feng yu Shanghai Lung Cancer Center Chest Hospital Affiliated to Shanghai Jiao Tong University Shanghai 200030 China

Nowadays,advanced non-small cell lung cancer (NSCLC) is still an incurable ***,recent researches on maintenance therapy have led to considerable ***,pemetrexed and erlotinib have been approved for maintenance chemotherapy by both the *** and Drug Administration and European Medicines ***,there are not adequate data to support the maintenance therapy as the standard treatment for advanced NSCLC and there has been no conclusive predictor of who will get benefit from maintenance chemotherapy and what type of maintenance,continuation or switch,is *** article reviews the main studies on maintenance therapy of advanced NSCLC and discusses the results available to date.

关键词： Non-small cell lung cancer Maintenance therapy Pemetrexed Erlotinib

Characteristics of the reduction behavior of zinc ferrite and ammonia leaching after roasting

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International Journal of Minerals,Metallurgy and Materials 2020年第1期27卷 26-36页

作者： Chao Wang yu-feng Guo Shuai Wang feng Chen yu-jia Tan Fu-qiang Zheng Ling-zhi Yang School of Minerals Processing and Bioengineering Central South University

A novel method for recovering zinc from zinc ferrite by reduction roasting–ammonia leaching was studied in this paper. The reduction thermodynamic of zinc ferrite by CO was analyzed. The effects of roasting parameters on the phase transformation and conversion rate of zinc ferrite, and the leaching behavior of zinc from the reductive roasted samples by ammonia leaching, were experimentally investigated. The mineralogical phase compositions and chemical compositions of the samples were characterized by X-ray diffraction and chemical titration methods, respectively. The results showed that most of the zinc ferrite was transformed to zinc oxide and magnetite after weak reduction roasting. 86.43% of the zinc ferrite was transformed to zinc oxide under the optimum conditions: CO partial pressure of 25%, roasting temperature of 750°C, and roasting duration of 45 min. Finally, under the optimal leaching conditions, 78.12% of zinc was leached into the solution from the roasted zinc ferrite while all iron-bearing materials were kept in the leaching residue. The leaching conditions are listed as follows: leaching duration of 90 min,ammonia solution with 6 mol/L concentration, leaching temperature of 50°C, solid-to-liquid ratio of 40 g/L, and stirring speed of 200 r/min.

关键词： zinc ferrite reduction roasting ammonia leaching zinc extraction zinc-bearing waste

Comparison study on hot state modification of converter slag by adding Al_(2)O_(3) or SiO_(2)

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Journal of Iron and Steel Research International 2024年第11期31卷 2684-2692页

作者： yu-feng Tian Guang-qiang Li Yong-qian Li yu Liu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan 430081HubeiChina China Baowu Steel Group Corporation Limited Shanghai201900China

The value-added utilization of converter steel slag is crucial, with China’s annual production having reached 100 million tons. The utilization of converter slag in the construction materials sector is limited as it undergoes volume expansion during the aging process, mainly caused by the hydration reaction of free calcium oxide present in the slag. The influence of alumina addition on the mineral transformation of typical industrial converter slag was investigated. Different quantities of alumina were introduced into the slag, and the original and modified slags were remelted under argon atmosphere, followed by quenching. The experimental results were compared with thermodynamic simulation calculations for further analysis. As the alumina content increases, it reacts with the free calcium oxide in slag, leading to the formation of low-melting-point calcium aluminoferrite. Additionally, alumina addition effectively reduces slag viscosity. Finally, an assessment of the energy consumption for alumina-modified and silica-modified converter slags was presented.

关键词： Converter slag Free calcium oxide Alumina addition Viscosity Energy consumption

A Type of New Loop Algebra and a Generalized Tu Formula

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Communications in Theoretical Physics 2009年第1期51卷 39-46页

作者： GUO Fu-Kui ZHANG yu-feng Information School Shandong University of Science and Technology Qingdao 266510 China

A new Lie algebra, which is far different form the known An-1, is established, for which the corresponding loop algebra is given. From this, two isospectral problems are revealed, whose compatibility condition reads a kind of zero curvature equation, which permits Lax integrable hierarchies of soliton equations. To aim at generating Hamiltonian structures of such soliton-equation hierarchies, a beautiful Killing-Cartan form, a generalized trace functional of matrices, is given, for which a generalized Tu formula （GTF） is obtained, while the trace identity proposed by Tu Guizhang [J. Math. Phys. 30 （1989） 330] is a special case of the GTF. The computing formula on the constant γ to be determined appearing in the GTF is worked out, which ensures the exact and simple computation on it. Finally, we take two examples to reveal the applications of the theory presented in the article. In details, the first example reveals a new Liouville-integrable hierarchy of soliton equations along with two potential functions and Hamiltonian structure. To obtain the second integrable hierarchy of soliton equations, a higher-dimensional loop algebra is first constructed. Thus, the second example shows another new Liouville integrable hierarchy with 5-potential component functions and bi- Hamiltonian structure. The approach presented in the paper may be extensively used to generate other new integrable soliton-equation hierarchies with multi-Hamiltonian structures.

关键词： Lie algebra loop algebra Tu formula Hamiltonian structure

Algebraic Properties of Toeplitz and Small Hankel Operators on the Harmonic Bergman Space

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Acta Mathematica Sinica,English Series 2014年第8期30卷 1395-1406页

作者： Hong Yan GUAN yu feng LU School of Mathematical Sciences Dalian University of Technology School of Mathematics and Systems Science Shenyang Normal University

In this paper,we discuss some algebraic properties of Toeplitz operators and small Hankel operators with radial and quasihomogeneous symbols on the harmonic Bergman space of the unit disk in the complex plane *** solve the product problem of quasihomogeneous Toeplitz operator and quasihomogeneous small Hankel ***,we characterize the commutativity of quasihomogeneous Toeplitz operator and quasihomogeneous small Hankel operator.

关键词： Toeplitz operator small Hankel operator quasihomogeneous symbols harmonic Bergman space Mellin transform

Commuting Dual Toeplitz Operators on the Polydisk

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Acta Mathematica Sinica,English Series 2007年第5期23卷 857-868页

作者： yu feng LU Shu Xia SHANG Department of Applied Mathematics Dalian University of Technology Dalian 116024 P. R. China

On the polydisk, the commutativity of dual Toeplitz operators is studied. We obtain characterizations of commuting dual Toeplitz operators, essentially commuting dual Toeplitz operators and essentially semi-commuting ... 详细信息

关键词： dual Toeplitz operators polydisk Bergman space commute maximal ideal space

Pion Cloud Effects on △-N Mass Splitting from Quark Models

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Communications in Theoretical Physics 2002年第8期38卷 189-194页

作者： DONG yu-Bing feng Qing-Guo Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918-4 Beijing 100039 China Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918-4 Beijing 100039 China

Pion cloud effects on △-N mass splitting are studied based on quark models. Pseudo-scalar pion-quarkcoupling is discussed in the relativistic and nonrelativistic frameworks. We separately calculate the pion cloud effects bythe one-pion exchange potential and by another method which is consistent with the baryon chiral perturbation *** able discrepancy in the mass splitting between the two methods is shown.

关键词： quark models, coupling constants, pion cloud, △-N mass splitting