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Simulation of gas-solid flow in sinter vertical cooling furnace

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Journal of Iron and Steel Research International 2023年第11期30卷 2133-2142页

作者： Teng-fei Qi Hai-feng Li Jun-jie Sun Guo-jun chen Yong-jie Zhang School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina Key Laboratory for Ecological Metallurgy of Multi-Metallic Mineral(Ministry of Education) Northeastern UniversityShenyang110819LiaoningChina Technology Center Shanghai Meishan Iron and Steel Co.Ltd.Nanjing210039JiangsuChina Central Research Institute Baosteel Co.Ltd.Shanghai201900China

The velocity distribution of sinter and gas in vertical cooling furnace(VCF)has an important influence on gas-solid heat *** on the slot model of single hopper in the VCF of Meishan Iron and Steel Co.,Ltd.,the velocity and particle size distribution of sinter and the velocity and pressure distribution of gas were studied using a computational fluid dynamics-discrete element method model to obtain the gas-solid flow rule in the *** results showed that the velocity of sinter near the wall and the edge of vent cowl was lower than that in the rest of the same ***,the rectangular section of the vertical cooling furnace can be divided into a quasi-static zone,a plug flow zone and a convergent flow zone according to the flow velocity of the *** average particle size and the void fraction of sinter bed were distributed in"W"and"V"shape along the width direction,*** distribution of gas velocity in the furnace cavity was uneven,and the high-velocity area gradually changed from the center to the edge of the furnace cavity with the rise of *** the ratio of edge to center gas flow from 2.7∶1 to 0.7∶1 could improve the gas velocity,but could not change the gas velocity *** gas velocity distribution was more affected by the average particle size distribution of the sinter *** was suggested that measures need be taken to adjust it to improve the gas velocity distribution in the VCF.

关键词： Sinter Vertical cooling furnace Average particle size Void fraction Velocity distribution Gas distribution mode

土壤中铬价态转化的影响因素与作用机制研究进展

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岩矿测试 2025年第1期44卷 35-50页

作者：陈俊茹沈亚婷刘菲国家地质实验测试中心北京100037 中国地质大学(北京) 北京100083 自然资源部生态地球化学重点实验室北京100037

土壤中铬(Cr)污染是全球性环境问题,六价铬Cr(Ⅵ)因其高毒性及致癌性而成为关注焦点。土壤中的Cr主要以Cr(Ⅲ)和Cr(Ⅵ)的形式存在,两者之间的转化受到诸如土壤pH值、氧化还原电位(Eh)、天然氧化还原剂、有机质和微生物的影响。随着工农... 详细信息

土壤中铬(Cr)污染是全球性环境问题,六价铬Cr(Ⅵ)因其高毒性及致癌性而成为关注焦点。土壤中的Cr主要以Cr(Ⅲ)和Cr(Ⅵ)的形式存在,两者之间的转化受到诸如土壤pH值、氧化还原电位(Eh)、天然氧化还原剂、有机质和微生物的影响。随着工农业活动的增多,土壤中的Cr浓度不断增加,并通过植物吸收进入食物链等多种途径,对生态系统和人体健康构成威胁。本文对Cr在全球范围内的污染现状及来源、土壤中Cr的不同价态及其毒性特征进行了评述,并分析了pH、Eh对土壤中Cr的具体存在形态与价态的影响,及天然氧化还原剂、有机质等因素利用自身化学性质充当电子供体或受体的角色对土壤中Cr价态进行转化的氧化还原机理,以及不同影响因素之间的相互作用关系,从而可以全面理解土壤中Cr价态转化的行为机制。此外,在对Cr价态影响因素深入了解的基础上,总结了以生物炭和纳米材料为代表的先进修复技术方法,这些材料和方法由于能够将Cr(Ⅵ)有效地还原为毒性较小的Cr(Ⅲ),从而降低生态环境风险,因而是一类具有巨大潜在应用价值的修复材料和修复方法,但大规模应用的可行性及其修复效果仍需要进一步验证。

关键词： Cr污染 Cr价态天然氧化还原剂有机质修复技术

Experimental study on effects of air injection on cavitation pressure pulsation and vibration in a centrifugal pump with inducer

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Journal of Hydrodynamics 2023年第6期35卷 1168-1178页

作者： Yan-hong Mao Hou-lin Liu Yong Wang jie chen fei Liu Research Center of Fluid Machinery Engineering and Technology Jiangsu UniversityZhenjiang212013China Suzhou Vocational Institute of Industrial Technology Suzhou215104China

Cavitation commonly induces performance deterioration and system vibration in many engineering *** paper aims to investigate the effects of air injection on cavitation evolution,pressure pulsation and vibration in a centrifugal pump with *** this paper,the high-speed camera is used to capture the gas flow pattern and cavitation evolution process in the *** impacts of air injection on the inlet pressure pulsation and vibration are also *** results show that the cavitation development in the inducer undergoes four patterns:incipient cavitation,sheet cavitation,cloud cavitation and super *** the development of cavitation,the main frequency of the pressure pulsation shifts to lower frequencies,and the amplitude of the vibration *** addition,air injection promotes the incipient cavitation but delays the cavitation development.A small amount of air can effectively decrease amplitudes of pressure pulsation and *** as the air content increases,the fluctuations and amplitudes of pressure pulsation and vibration increase.

关键词： Air injection cavitation control inducer vibration pressure pulsation

Rational Design of Organelle-Targeted Fluorescent Probes:Insights from Artificial Intelligence

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Research 2023年第3期2023卷 769-779页

作者： jie Dong jie Qian Kunqian Yu Shuai Huang Xiang cheng fei chen Hualiang Jiang Wenbin Zeng Xiangya School of Pharmaceutical Sciences Central South UniversityChangsha 410083P.R.China National Engineering Research Center of Rice and Byproduct Deep Processing School of Food Science and EngineeringCentral South University of Forestry and TechnologyChangsha 410004P.R.China State Key Laboratory of Drug Research Drug Discovery and Design CenterShanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203P.R.China

Monitoring the physiological changes of organelles is essential for understanding the local biological information of cells and for improving the diagnosis and therapy of ***,fluorescent probes are considered as the most powerful tools for imaging and have been widely applied in biomedical ***,the expected targeting effects of these probes are often inconsistent with the real *** design of fluorescent probes mainly depends on the empirical knowledge of researchers,which was inhibited by limited chemical space and low ***,we proposed a novel multilevel framework for the prediction of organelle-targeted fluorescent probes by employing advanced artificial intelligence *** this way,not only the targeting mechanism could be interpreted beyond intuitions but also a quick evaluation method could be established for the rational ***,the targeting and imaging powers of the optimized and synthesized probes based on this methodology were verified by quantitative calculation and experiments.

关键词： inhibited diagnosis Probe

Super minimal surfaces in hyper quadric Q2

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Frontiers of Mathematics in China 2020年第5期15卷 1035-1046页

作者： Jun WANG jie fei School of Mathematics Sciences and Institute of Mathematics Nanjing Normal UniversityNanjing 210023China Department of Pure Mathematics School of ScienceXi'an Jiaotong-Liverpool UniversitySuzhou 215123China

We study a superminimal surface M immersed into a hyperquadric Q2 in several cases classified by two global defined functions TX and TY,which were introduced by *** and *** to study a minimal immersion f:M→*** case both TX and TY are not identically zero,it is proved that fis superminimal if and only if f is totally real or io f:M→CP3 is also minimal,where i:Q2→CP^3 is the standard inclusion *** the rest case that TX=0 or TY=0,the minimal immersion f is automatically *** a consequence,all the superminimal two-spheres in Q2 are completely described.

关键词： Hyperquadric superminimal surface totally real holomorphic

LVIS支架辅助栓塞治疗颅内后循环动脉瘤的疗效

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中国临床神经外科杂志 2019年第7期24卷 406-409页

作者：韦成聪谢昌纪周志宇陈杰飞广西壮族自治区民族医院神经外科

目的探讨LVIS支架辅助栓塞治疗颅内后循环动脉瘤的安全性及有效性。方法回顾性分析2015年9月至2018年5月采用LVIS支架辅助栓塞治疗的39例(40个动脉瘤)颅内后循环动脉瘤的临床资料。采用单支架27例(单支架组),双支架12例(双支架组)。结果... 详细信息

目的探讨LVIS支架辅助栓塞治疗颅内后循环动脉瘤的安全性及有效性。方法回顾性分析2015年9月至2018年5月采用LVIS支架辅助栓塞治疗的39例(40个动脉瘤)颅内后循环动脉瘤的临床资料。采用单支架27例(单支架组),双支架12例(双支架组)。结果 39例共使用LVIS支架51枚,其中40枚支架释放时一次性完全打开,10枚释放支架后采用导管导丝按摩技术后完全打开,1枚支架打开不完全。单支架组和双支架组围手术期并发症发生率(0%vs. 11.1%)无统计学差异(P>0.05)。术后即刻造影显示:单支架组和双支架组有效栓塞率(92.6%vs. 91.7%)无统计学差异(P>0.05)。术后6个月DSA复查:单支架组和双支架组动脉瘤完全闭塞率(77.7%vs. 75.0%)及复发率(7.4%vs. 8.3%)均无统计学差异(P>0.05)。术后6个月改良Rankin量表评分0分19例,1分15例,2分2例,3分3例。结论 LVIS支架辅助栓塞治疗颅内后循环颅内动脉瘤效果满意,短期影像学随访显示双支架辅助栓塞结果并不优于单支架组。

关键词：颅内动脉瘤后循环 LVIS支架预后

Inexact proximal gradient algorithm with random reshuffling for nonsmooth optimization

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Science China(Information Sciences) 2025年第1期 219-237页

作者： Xia JIANG Yanyan FANG Xianlin ZENG Jian SUN jie chen National Key Lab of Autonomous Intelligent Unmanned Systems School of AutomationBeijing Institute of Technology Beijing Institute of Technology Chongqing Innovation Center School of Electronic and Information Engineering Tongji University

Proximal gradient algorithms are popularly implemented to achieve convex optimization with nonsmooth regularization. Obtaining the exact solution of the proximal operator for nonsmooth regularization is challenging because errors exist in the computation of the gradient; consequently, the design and application of inexact proximal gradient algorithms have attracted considerable attention from researchers. This paper proposes computationally efficient basic and inexact proximal gradient descent algorithms with random reshuffling. The proposed stochastic algorithms take randomly reshuffled data to perform successive gradient descents and implement only one proximal operator after all data pass through. We prove the convergence results of the proposed proximal gradient algorithms under the sampling-without-replacement reshuffling *** computational errors exist in gradients and proximal operations, the proposed inexact proximal gradient algorithms can converge to an optimal solution neighborhood. Finally, we apply the proposed algorithms to compressed sensing and compare their efficiency with some popular algorithms.

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Multiple recurrent neurofibromas in the abdominal wall:A case report

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World Journal of Clinical Cases 2020年第18期8卷 4223-4227页

作者： Xue-fei Zhao Ying-Mo Shen jie chen Department of Hernia and Abdominal Wall Surgery Beijing Chaoyang HospitalCapital Medical UniversityBeijing 100020China

BACKGROUND Neurofibroma can be a clinical manifestation of neurofibromatosis,which is a benign neurogenic tumor that occurs *** in the abdomen usually appear in the retroperitoneal *** on neurofibromas in the abdominal wall are rare,and multiple recurrent neurofibromas in this area have not yet been *** SUMMARY This is a case of a 73-year-old man who suffered from multiple recurrent neurofibromas in the abdominal wall for 16 years and received 13 surgical *** We need to pay due attention to its treatment,and primary surgery should be designed thoroughly.

关键词： Neurofibroma Abdominal wall surgery Multiple Recurrent Case report

Improved Photovoltaic Performance from High Quality Perovskite Thin Film Grown with the Assistance of PC71BM

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Chinese Journal of Polymer Science 2017年第2期35卷 309-316页

作者： jie-huan chen shi-da yang wen-qing liu wei-fei fu 陈红征 Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of Education State Key Laboratory of Silicon Materials Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

The strategy of sequentially spin-coating a perovskite film from the perovskite precursor and an electron transporting layer of [6,6]-phenyl-C71-butyric acid methyl ester （PC71BM） is developed to simplify the fabrication procedure of perovskite solar cells. X-ray diffraction and scanning electron microscopy indicate that PCTIBM film on perovskite layer can retard the evaporation of dimethyl sulfoxide （DMSO） efficiently, thus prolonging the transformation of intermediate phase to perovskite crystals, leading to a high quality perovskite thin film. The solar cells with the structure of indium tin oxides （ITO）/poly（3,4-ethylenedioxythiophene）：poly（styrenesulfonate）（PEDOT：PSS）/CH3NH3PbI3/PC71BM/bathocuproine （BCP）/Ag made from this simplified method exhibit a higher efficiency （12.68%） than those from the conventional one-step method （9.49%）.

关键词： Perovskite solar cells Simplified preparation process Crystallization