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Development and prospects of molten steel deoxidation in steelmaking process

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 18-32页

作者： Zhongliang Wang Yanping bao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

In the long traditional process of steelmaking,excess oxygen is blown into the converter,and alloying elements are used for *** inevitably results in excessive deoxidation of products remaining within the steel liquid,affecting the cleanliness of the *** the increasing requirements for steel performance,reducing the oxygen content in the steel liquid and ensuring its high cleanliness is *** more than a hundred years of development,the total oxygen content in steel has been reduced from approximately 100×10^(-6)to approximately 10×10^(-6),and it can be controlled below 5×10^(-6)in some steel grades.A relatively stable and mature deoxidation technology has been formed,but further reducing the oxygen content in steel is no longer significant for improving steel *** research team developed a deoxidation technology for bearing steel by optimizing the entire conventional *** technology combines silicon–manganese predeoxidation,ladle furnace diffusion deoxidation,and vacuum final *** successfully conducted industrial experiments and produced interstitial-free steel with natural decarbonization ***-aluminum deoxidation was found to control the oxygen content in bearing steel to between 4×10^(-6) and 8×10^(-6),altering the type of inclusions,eliminating large particle Ds-type inclusions,improving the flowability of the steel liquid,and deriving a higher fatigue *** natural decarbonization predeoxidation of interstitial-free steel reduced aluminum consumption and production costs and significantly improved the quality of cast billets.

关键词： steel deoxidation deoxidizer metallurgical equipment bearing steel IF steel

基于“时间-空间-关系”三个维度的美丽城市建设研究

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生态经济 2025年第1期41卷 19-27页

作者：包存宽申沐曦李红丽复旦大学环境科学与工程系上海200438 复旦大学大气与海洋科学系上海200438

论文探讨了人与自然和谐共生美丽城市的时代内涵,即美丽城市是坚持以人民为中心的发展思想,兼具客观性与主观性,呈现绿色低碳、环境优美、生态宜居、安全健康、智慧高效等时代特征的,并从景观生态学及“存在的三元辩证”,构建了“时间... 详细信息

论文探讨了人与自然和谐共生美丽城市的时代内涵,即美丽城市是坚持以人民为中心的发展思想,兼具客观性与主观性,呈现绿色低碳、环境优美、生态宜居、安全健康、智慧高效等时代特征的,并从景观生态学及“存在的三元辩证”,构建了“时间—空间—关系”的三维分析框架,阐述了美丽城市建设的“全领域转型”“全方位提升”“全地域建设”以及“全社会行动”四大关键任务,最后提出了美丽城市建设的政策建议。

关键词：美丽中国美丽城市城市治理城市更新

Existence and Instability of Some Nontrivial Positive Steady States for the SKT Model with Double Cross Diffusion

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Acta Mathematicae Applicatae Sinica 2023年第3期39卷 623-637页

作者： Zhi-bao TANG School of Mathematical Sciences Capital Normal UniversityBeijing 100048China

This paper is concerned with the nonconstant positive steady states of the Shigesada-Kawasaki-Teramoto model for two competing species with double cross-diffusion *** applying the Lyapunov-Schmidt decomposition method,the higher order expansion and some detailed spectral analysis,we prove the existence,asymptotic behavior and spectral instability of non-trivial steady states in high-dimensional case when one of the two cross-diffusion coefficients is large enough.

关键词： double cross-diffusion existence asymptotic behavior spectral instability

Third-party relational governance and collaborative innovation performance:The role of IPR protection

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International Journal of Innovation Studies 2020年第1期4卷 1-15页

作者： Ou Bai Jiang Wei Xiaohua Yang Roger (rongxin) Chen School of Tourism and Health Zhejiang A&F UniversityHangzhou311300China School of Management University of San FranciscoSan Francisco94117USA School of Management Zhejiang UniversityHangzhou310058China Moral Culture Research Center Hunan Normal University410081China

The purpose of this study is to explore the impact of third-party relational governance on the performance of collaborative innovation in China. By integrating the relational view and innovation appropriation perspectives, this study analyses the effects of three mechanisms of third-party relational governancedco-reputation, interorganizational routines, and technological normsdon collaborative innovation performance. Additionally,this study investigates the moderating effects of the protection of intellectual Property Rights(IPR) on the relationship between third-party relational governance and collaborative innovation performance. Survey data of high-technology firms in China are used to empirically test the hypotheses. The results show that third-party relational governance has a positive effect on collaborative innovation performance and that IPR protection has different moderating effects. This study contributes to the relational governance literature by adding the perspective of third parties and analyzing three mechanisms of third-party relational governance in a single model. This study also contributes to the innovation appropriation literature by examining the role of IPR protection in governing collaborative innovation in China. Finally, this study offers suggestions on how Chinese firms should govern their collaborative innovation to remedy the limitations of a weak IPR legal institutional framework.

关键词： Third-party relational governance Collaborative innovation IPR protection Chinese high-technology industry

Unimodality of Independence Polynomials of the Cycle Cover Product of Graphs

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Acta Mathematica Sinica,English Series 2022年第5期38卷 858-868页

作者： bao Xuan ZHU School of Mathematics and Statistics Jiangsu Normal UniversityXuzhou 221116P.R.China

An independent set in a graph G is a set of pairwise non-adjacent *** ik(G)denote the number of independent sets of cardinality k in *** its generating function I(G;x)=∑^(α(G))^(k=0)ik(G)x^(k),is called the independence polynomial of G(Gutman and Harary,1983).In this paper,we introduce a new graph operation called the cycle cover product and formulate its independence *** also give a criterion for formulating the independence polynomial of a *** on the exact formulas,we prove some results on symmetry,unimodality,reality of zeros of independence polynomials of some *** applications,we give some new constructions for graphs having symmetric and unimodal independence polynomials.

关键词： Independence polynomials unimodality log-concavity real zeros symmetry cycle cover product of graphs

Global Regularity of Solutions for a One-dimensional Nuclear Fluid with Non-monotone Pressure

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Acta Mathematicae Applicatae Sinica 2019年第4期35卷 798-811页

作者： bao-wei FENG Department of Economic Mathematics Southwestern University of Finance and Economics

We consider a one-dimensional continuous thermal model of nuclear matter, which is described by a compressible Navier-Stokes-Poission system with a non-monotone equation of state owing to the effective Skyrme nuclear interaction between particles. We prove the global existence of solutions in H^4 space for a free boundary value problem with a possible destabilizing influence of the pressure which is not always positive,provided a sufficient thermal dissipation is present and first obtain the existence of classical solutions.

关键词： global existence compressible fluid non-monotone fluid

Construction of pyrene-based hydrogen-bonded organic frameworks as photocatalysts for photooxidation of styrene in water

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Chinese Chemical Letters 2024年第10期35卷 394-398页

作者： rongxin Zhu Shengsheng Yu Xuanzong Yang Ruyu Zhu Hui Liu Kaikai Niu Lingbao Xing School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255000China

Using hydrogen-bonded organic frameworks(HOFs)as photosensitizers to perform photocatalytic oxidation reactions under green and mild conditions is still a challenge for the application of HOFs *** study presents a novel approach that exploits HOFs to enhance the efficiency of photocatalytic oxidation for achieving visible light catalytic oxidation of styrene and its derivatives in the aqueous *** using 1,3,6,8-tetrakis(p-benzoic acid)pyrene(H_(4)TBAPy)as the monomer,a pyrene-based hydrogen-bonded organic framework(PFC-1)with a microporous structure was successfully *** with monomer H_(4)TBAPy,due to the exciton effect and the interlayer confinement of HOFs,the singlet oxygen(1O_(2))production efficiency is significantly improved,which has great potential in photocatalytic oxidation ***,the practicality of PFC-1 as a photocatalyst was studied,and the photocatalytic oxidation of styrene and its derivatives in aqueous solution was achieved under visible light with high catalytic efficiency,indicating that PFC-1 has significant potential to promote photocatalytic oxidation reactions under mild *** utilization of HOFs as photosensitizers in this straightforward approach enables the attainment of green photocatalytic oxidation,hence expanding the potential applications of HOFs materials within the realm of photocatalysis.

关键词： Pyrene Hydrogen-bonded organicframeworks Singlet oxygen Photocatalysis Styrene

Development of an integrated process for the production of high-purityγ-aminobutyric acid from fermentation broth

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Chinese Journal of Chemical Engineering 2022年第10期50卷 361-368页

作者： Zhaofeng Zhang Juanjuan Ding Min Wu Bochao Liu Huiwen Song Shengping You Wei Qi rongxin Su Zhimin He Chemical Engineering Research Center School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China State Key Laboratory of Chemical Engineering Tianjin UniversityTianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China Tianjin Key Laboratory of Membrane Science and Desalination Technology Tianjin UniversityTianjin 300072China Henan Julong Biological Engineering Co. LtdChina

γ-Aminobutyric acid(GABA),a natural non-protein amino acid,plays an irreplaceable role in regulating the life activities of ***,the separation and purification of food-grade GABA from fermentation broth is still a great *** research utilized monosodium glutamate as a substrate for the production of high-purity GABA via an integrated process incorporating fermentation,purification,and ***,147 g·L^(-1) GABA with a yield of 99.8%was achieved through fed-batch fermentation by Lactobacillus brevis ***,three integrated purification methods by ethanol precipitation were compared,and crude GABA with a purity of 89,85%was obtained by the optimized ***,GABA crystals with a purity of 98.69%and a yield of 60%were further obtained through a designed crystallization ***,the GABA industrial production process model was established by Superproper Designer V10 software,and material balance and economic analysis were carried *** used in the process was recovered with a recovery of 98.79%through Aspen simulated extractive *** the fixed investment(equipment purchase and installation costs)for an annual production of 80 t GABA will be about 833000 USD;the total annual production cost(raw material cost and utility cost)will be about 641000 *** annual sale of GABA may be at the range of 2400000-4000000 USD and the payback period will be about 1-2 *** integrated process provides a potential way for the industrial-scale production of food-grade GABA.

关键词： Fermentation Desalination Precipitation Crystallization Superproper DesignerV10 Aspen

Memristive cyclic three-neuron-based neural network with chaos and global coexisting attractors

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Science China(Technological Sciences) 2022年第11期65卷 2582-2592页

作者： bao Han CHEN ZhuGuan CAI JianMing XU Quan bao BoCheng School of Microelectronics and Control Engineering Changzhou UniversityChangzhou 213164China

It has been documented that a cyclic three-neuron-based neural network with resistive synaptic weights cannot exhibit *** this end,a memristive cyclic three-neuron-based neural network is presented using a memristive weight to substitute a resistive *** memristive cyclic neural network always has five equilibrium points within the parameters of interest,and their stability analysis shows that they are one index-2 saddle-focus,two index-1 saddle-foci,and two stable node-foci,*** analyses are performed for the memristive cyclic neural network by several numerical simulation *** results demonstrate that the memristor synapse-based neural network with the simplest cyclic connection can not only exhibit chaos,but also present global coexisting attractors composed of stable points and unstable periodic or chaotic orbits under different initial ***,with the designed implementation circuit,Multisim circuit simulations and hardware experiments are executed to validate the numerical simulations.

关键词： memristive weight cyclic neural network chaos coexisting attractors hardware experiment