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Slags containing transition metal(chromium and vanadium)oxides——Conversion from ticking bombs to valuable resources:Collaborative studies between KTH and USTB

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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 750-757页

作者： Seshadri Seetharaman lijun wang Haijuan wang Royal Institute of Technology(KTH) Stockholm 10044Sweden Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

As the steel industry expands worldwide,slag dumps with transition metals(especially chromium and vanadium)are becoming more common,posing a serious environmental *** the properties of slags containing transition metal oxides,as well as how to use the slags to recover and recycle metal values,is *** this end,the University of Science and Technology Beijing(USTB)and Royal Institute of Technology(KTH)have been collaborating on slags containing transition metals for *** research was carried out from a fundamental viewpoint to get a better understanding of the structure of these slags and their properties,as well as industrial *** research focused on the three“R”s,***,recovery,and *** present paper attempts to highlight some of the important achievements in these joint studies.

关键词： transition metals vanadium chromium recovery collaborative study

The Determination on Weight Hierarchies of q-Ary Linear Codes of Dimension 5 in Class IV

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Journal of Systems Science & Complexity 2016年第1期29卷 243-258页

作者： wang lijun CHEN Wende School of Mathematics and Statistics South-Central University for Nationalities Laboratory of Systems and Control and Information Security Center Institute of Systems ScienceChinese Academy of Science

The weight hierarchy of a linear[n;k;q]code C over GF(q) is the sequence(d_1,d_2,…,d_k)where d_r is the smallest support of any r-dimensional subcode of C. "Determining all possible weight hierarchies of general linear codes" is a basic theoretical issue and has important scientific significance in communication ***,it is impossible for g-ary linear codes of dimension k when q and k are slightly larger,then a reasonable formulation of the problem is modified as: "Determine almost all weight hierarchies of general g-ary linear codes of dimension k".In this paper,based on the finite projective geometry method,the authors study g-ary linear codes of dimension 5 in class IV,and find new necessary conditions of their weight hierarchies,and classify their weight hierarchies into6 *** authors also develop and improve the method of the subspace set,thus determine almost all weight hierarchies of 5-dimensional linear codes in class *** opens the way to determine the weight hierarchies of the rest two of 5-dimensional codes(classes III and VI),and break through the ***,the new necessary conditions show that original necessary conditions of the weight hierarchies of k-dimensional codes were not enough(not most tight nor best),so,it is important to excogitate further new necessary conditions for attacking and solving the fc-dimensional problem.

关键词： Difference sequence q-ary linear code of dimension 5 weight hierarchy

Application of Dual-blade Stator to Low-speed Ratio Performance Improvement of Torque Converters

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Chinese Journal of Mechanical Engineering 2016年第2期29卷 293-300页

作者： WU Guangqiang wang lijun Automotive School Tongji University Institute of Industrial Science the University of Tokyo

With application of the lock-up clutch in the torque converter（TC）, fuel economy is not much determined by its high-speed ratio transmission efficiency. As a benefit, more researches are focused on its low-speed ratio performance so as to improve vehicle gradeability and launching acceleration performance. According to the results of computational fluid dynamics（CFD） analysis, hydrodynamic loss inside the stator cascade accounts for 42% of the total energy loss at stalling speed ratio. It is found that upstream flow with large impingement angle results in boundary layer separation at the leading edge, which aggregates hydrodynamic loss and decreases circular flow rate dramatically at low-speed ratio. In this paper, a dual-blade stator is proposed to suppress the boundary layer separation, which is parameterized by using the non-uniform rational B spline（NURBS） method. The mean camber line and blade profile curve are expressed by a three control points quadratic open NURBS and a cubic closed one respectively. The key design parameters included the slot width and suction side shape of the primary blade are analyzed. The most effective slot width is found to be between 4% and 8% chord length, and the boundary layer separation can be suppressed completely by decreasing distribution of momentum moment at the primary blade and adding it to the leading edge of the secondary blade. As a result, circular flow rate and impeller torque capacity is increased by 17.9% and 9.6% respectively at stalling speed ratio, meanwhile, low-speed ratio efficiency is also improved. Maximum efficiency at high-speed ratio decreases by 0.5%, which can be ignored as the work of lock-up clutch. This research focuses on using the dual-blade stator to optimize low-speed ratio performance of the TC, which is benefit to vehicle power performance.

关键词： torque converter dual-blade stator boundary layer separation non-uniform rational B spline

GmACP expression is decreased in Gm NORK knockdown transgenic soybean roots

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The Crop Journal 2016年第6期4卷 509-516页

作者： lijun wang Lingwei Deng College of Life Science Yangtze University Heilongjiang Academy of Agricultural Sciences

NORK and soybean acyl carrier protein(ACP) both play important roles in ***,the relationship between Nod factor signaling and fatty acid(FA) biosynthesis during symbiotic development is *** this study,an RNAi plasmid of Gm NORK was constructed and transformed into soybean roots by Agrobacterium rhizogene-mediated hairy-root *** nodule number decreased substantially in Gm NORK knockdown soybean transgenic *** investigate the relationship between Gm ACP and Nod factor signaling,we measured Gm ACP expression levels in Gm NORK RNAi soybean transgenic roots and found that rhizobia inoculation led to substantially reduced Gm ACP ***,FA biosynthesis was affected by Nod factor signaling during nodule development in soybean,a finding that provides valuable information that improves our understanding of the functions of Gm NORK and Gm ACP in symbiotic signaling and nodule development.

关键词： NORK ACP Soybean Nodule Rhizobium

DNA-based nanosystems to generate reactive oxygen species for nanomedicine

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Chinese Chemical Letters 2024年第11期35卷 25-34页

作者： Zhongyu wang lijun wang Huaixin Zhao Frontiers Science Center for Synthetic Biology Key Laboratory of Systems Bioengineering(MOE)Institute of Biomolecular and Biomedical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China

Reactive oxygen species(ROS)are essential in various pathological and physiological *** nanosystems that generate ROS in a controlled manner is of great interest for *** nanotechnology offers a promising approach to constructing programmable ROS-generating *** incorporating photosensitizers or metal ions,DNA nanostructures can be designed to produce ROS in a spatially and temporally desired ***-based ROS-generating nanosystems hold great potential in intracellular homeostasis regulation,drug release,and cancer *** review summarizes recent advances in developing DNA-based ROS-generating nanosystems,highlights their emerging biomedical applications,and discusses the opportunities and challenges for further *** nanotechnology provides a versatile toolkit to construct biocompatible ROS-generating platforms for next-generation nanomedicines.

关键词： DNA nanotechnology Photodynamic therapy Chemodynamic therapy Reactive oxygen species Nanomedicine

Experimental Investigation of Metal Oxide Enhancing Thermal Physical Properties of Nylon 1010 Composites

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工程热物理学报 2013年第5期34卷 899-904页

作者： HAN Dongtai YANG Yong wang lijun School of Electric Power Engineering China University of Mining and Technology

By using Differential Scanning Caborimetry（DSC）,Thermogravimetric（TG） thermal analysis etc,we determined thermal physical properties,such as the heat conduction performance, specific heat capacity,heat stability and etc,of different metal oxide/Nylon 1010 *** results show that after added ZnO,CuO,Fe3O4 in PAlOlO matrix,the thermal conductivity of composites linear increases with the increasing of the quality score of metal *** using ZnO as thermal conductive filler and the particle diameter ranges 35 to 40μm,heat conduction performance of the modified composites is the *** thermal conductivity of ZnO/PA1010 composites linear increases with the temperature *** heat capacity of Nylon 1010 and all kinds of metal oxide/Nylon 1010 increases gradually with the temperature *** the same temperature,heat capacity of the modified composites reduces gradually with the content of metal oxide *** glass transition temperature of Nylon 1010 is about 47℃or so,and adding metal oxide can improve the thermal stability of composites.

关键词： metal oxide PA1010 heat-conducting property heat capacity thermal stability

Decomposition process of zircon sand concentrate with CaO-NaOH

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Rare Metals 2012年第4期31卷 410-414页

作者： Zhang, Jiandong wang, lijun Jiang, Dongmin Division of Mineral Resources Metallurgy & MaterialsGeneral Research Institute for Nonferrous MetalsBeijing 100088China Zhejiang Zr-Valley Science & Technology Co.Ltd Zhejiang 313220China

The decomposition process for zircon sand concentrate using mixed base of sodium hydroxide partly replaced by calcium oxide was *** is found that the decomposition rate of zircon gradually increased with the increase of the reaction temperature and *** decomposition rate is over 97% with the conditions that CaO/zircon molar ratio is 0.25 ～ 0.75 at 800 ℃ for 1 *** the decomposition rate decreased when the molar ratio was more than ***,thermogravimetry-differential thermal analysis(TG-DTA) and X-ray diffraction(XRD) were used to study the reaction mechanism of zircon decomposition process with *** results showed that Na_2O,which was generated by the reaction of CaO and Na_4SiO_4,increased the decomposition rate of zircon owing to its spread to the surface of zircon and played a role in decomposition process.

关键词： zircon decomposition calcium oxide sodium hydroxide TG-DTA

Effect of V and V-N Microalloying on Deformation-Induced Ferrite Transformation in Low Carbon Steels

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Journal of Materials Science & Technology 2006年第2期22卷 159-163页

作者： Kai wang lijun wang Wenfang CUI Chunming LIU School of Materials and Metallurgy Northeastern University Shenyang 110004 China

Deformation-induced ferrite transformation （DIFT） has been proved to be an effective approach to refine ferrite grains. This paper shows that the ferrite grains can further be refined through combination of DIFT and V or V-N microalloying. Vanadium dissolved in γ matrix restrains DIFT. During deformation, vanadium carbonitrides rapidly precipitate due to strain-induced precipitation, which causes decrease in vanadium dissolved in matrix and indirectly accelerates DIFT. Under heavy deformation, deformation induced ferrite （DIF） grains in V microalloyed steel were finer than those in V free steel. The more V added to steel, the finer DIF grains obtained. Moreover, the addition of N to V microalloyed steels can remarkably accelerate precipitation of V, and then promote DIFT. However, DIF grains in V-N microalloyed steel easily coarsen.

关键词： Deformation induced ferrite transformation Strain induced precipitation V microalloyed steel V-N microalloyed steel Thermomechanical simulation

Interaction of two in-line bubbles of equal size rising in viscous liquid

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Chinese Journal of Chemical Engineering 2020年第1期28卷 54-62页

作者： Zhen Tian Xi Li Youwei Cheng lijun wang College of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310027China

The interaction of bubbles is the key to understand gas–liquid bubbling flow. Two-dimensional axis-symmetry computational fluid dynamics simulations on the interactive bubbles were performed with VOF method,which was validated by experimental work. It is testified that several different bubble interactive behaviors could be acquired under different conditions. Firstly, for large bubbles(d: 4, 6, 8, 10 mm), the trailing bubble rising velocity and aspect ratio have negative correlations with liquid viscosity and surface tension. The influences of viscosity and surface tension on leading bubble are negligible. Secondly, for smaller bubbles(d: 1, 2 mm), the results are complicated. The two bubbles tend to move together due to the attractive force by the wake and the potential repulsive force. Especially for high viscous or high surface tension liquid, the bubble pairs undergo several times acceleration and deceleration. In addition, bubble deformation plays an important role during bubble interaction which cannot be neglected.

关键词： Bubble column reactor Computational fluid dynamics Bubble interaction Bubble rise velocity Volume-of-fluid method Bubble aspect ratio