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Numerical simulation of Marangoni effect induced by species transfer across iron droplet–molten slag interface

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Journal of Iron and Steel Research International 2023年第6期30卷 1109-1116页

作者： ming-ming li Zhen-qiang Wu lin li Zong-shu Zou Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgical Engineering Liaoning Institute of Science and TechnologyBenxi 117004LiaoningChina

A mathematical model accounting for unsteady mass transfer across interface of a stationary iron droplet immersed into molten slag was established through the volume of fluid coupled with level set *** Marangoni effect induced by mass transfer was reproduced successfully,and the hydrodynamic instability phenomena at the interface,such as the Marangoni convection flow,the evolution of the interfacial tension during the mass transfer,and the influence of Marangoni effect on the mass transfer rate,were *** results show that the Marangoni convection flow develops quickly and behaves as an ordered structure in the forms of four pairs of the convection cell at the edge of the droplet once the oxygen transfer across the interface *** average convection flow velocity along the interface is high,even more than 0.025 m/s,depending on the droplet diameter,which facilitates the mass *** Marangoni convection flow of the large droplet develops more easily than that of the small droplet,and the larger the droplet diameter is,the higher the convection flow velocity and the mass transfer rate ***,it is shown that the droplet diameter influences the impacting region of the Marangoni convection flow and its duration period.

关键词： Interfacial mass transfer Interfacial tension Marangoni effect Droplet Numerical simulation

Study on transient aerodynamic characteristics of parachute opening process

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Acta Mechanica Sinica 2007年第6期23卷 627-633页

作者： li Yu Xiao ming College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

In the research of parachute, canopy inflation process modeling is one of the most complicated tasks. As canopy often experiences the largest deformations and loa-dings during a very short time, it is of great difficulty for theoretical analysis and experimental measurements. In this paper, aerodynamic equations and structural dynamics equations were developed for describing parachute opening process, and an iterative coupling solving strategy incorpo- rating the above equations was proposed for a small-scale, flexible and flat-circular parachute. Then, analyses were carried out for canopy geometry, time-dependent pressure difference between the inside and outside of the canopy, transient vortex around the canopy and the flow field in the radial plane as a sequence in opening process. The mechanism of the canopy shape development was explained from perspective of transient flow fields during the inflation process. Experiments of the parachute opening process were conducted in a wind tunnel, in which instantaneous shape of the canopy was measured by high velocity camera and the opening loading was measured by dynamometer balance. The theoretical predictions were found in good agreement with the experimental results, validating the proposed approach. This numerical method can improve the situation of strong dependence of parachute research on wind tunnel tests, and is of significance to the understanding of the mechanics of parachute inflation process.

关键词： Parachute Opening process Numerical simulation Flow field characteristics Aerodynamics Structural dynamics

Emodin and baicalein inhibit pancreatic stromal derived factor-1 expression in rats with acute pancreatitis

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Hepatobiliary & Pancreatic Diseases International 2009年第2期8卷 201-208页

作者： li, Zong-Fang Xia, Xian-ming Huang, Chen Zhang, Shu Zhang, Jian Zhang, ai-Jun Xi An Jiao Tong Univ Sch Med Affiliated Hosp 2 Dept Surg Xian 710004 Peoples R China Xi An Jiao Tong Univ Minist Educ Key Lab Environm & Genes Related Dis Xian 710004 Peoples R China Wannan Med Coll Yijishan Hosp Dept Surg Wuhu 241001 Peoples R China

BACKGROUND: Stromal derived factor-1 (SDF-1) is an efficacious leukocyte chemoattractant, which can attract lymphocytes and mononuclear cells from bloodstream into the site of inflammation. Emodin., an anthraquinone derivative from Radix et Rhizoma Rhei, and baicalein, a flavone from Scutellaria baicalensis Georgi, both have been reported to possess anti-inflammatory activities. The expression pattern of SDF-1 in experimental acute pancreatitis (AP) and the effect of emodin or baicalein on that are not well defined. The present study aimed to investigate the effects of emodin and baicalein on pancreatic myeloperoxidase (MPO) activity (reflecting leukocyte sequestration) and cytokine production, as well as tissue SDF-1 expression in the setting of AP. METHODS: A :rat model of AP was induced by administration (of 5% sodium taurocholate through the biliopancreatic duct. The level of tumor necrosis factor-a (TNF-alpha), interleukin-6 (IL-6) and MPO in the pancreas, and serum amylase were tested by immunohistochemistry, EliSA and chromatometry. The expressions of SDF-1 alpha and SDF-1 beta were detected by real-time PCR, Western blotting, and immunohistochemistry. RESULT: Combination of emodin and baicalein significantly reduced pancreatic TNIP-alpha, IL-6 and MPO, and also inhibited pancreatic SDF-1 expression. CONCLUSIONS: The inhibition of SDF-1 expression by emodin and baicalein might contribute, in part at least, to the amelioration of pancreatic inflammation. The present study also shows benefits of simultaneous treatment of AP.

关键词： acute pancreatitis stromal derived factor-1 myeloperoxidase traditional Chinese medicine

Curing Behaviors and Thermal Properties of Dimer Fatty Acid （DFA） Modified Multifunctional Epoxy Resin

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Journal of Donghua University(English Edition) 2013年第6期30卷 525-529页

作者： Yu, ming-ming Sun, Jin-liang Ren, Mu-Su li, ai-Jun Bai, Rui-Cheng Hu, He-Feng Research Center for Composite Materials Shanghai University Shanghai 200072 China Department of Polymer Materials Shanghai University Shanghai 201800 China

In order to improve the toughness of the cured aromatic tetrafunctional epoxy resins, a dlmer rarboxylic acid named dlmer fatty acid （DFA） was used to modify an aromatic tetrafunctional epoxy, N, N, N＇, N＇-tetraglycidyl-2,2-bis [ 4-（ 4-aminophcuoxy ） phenyl ] propane （TGBAPP）. The curing behaviors of DFA- TGBAPP/MNA （ methyl nadic anhydride） systems were studied by differential scanning calorimetry （DSC） method. And the thermal properties of the cured epoxy resin were investigated with the thermo-gravimetric analysis （TGA） and dynamic mechanical analysis （DMA）. Besides, the toughness was characterized with the impact strength tested by charpy impact testing. The results indicated that the modification would improve the curing reactions, and the curing temperatures were decreased with the increasing content of DFA. The thermal properties were not influenced obviously, and the toughness could be improved when the epoxy resin was modified with DFA.

关键词： curing behavior thermal property N, N, N', N'- telraglycidyl-2, 2-bis [ 4-( 4-aminophenoxy ) phenyl ] propane (TGBAPP) dimer fatty acid ( DFA) toughen

Detour and return-Chenfu Wu’s interdisciplinary research journey

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Protein & Cell 2012年第7期3卷 481-482页

作者： ming li Beijing Institutes of life Science Chinese Academy of SciencesBeijing 100101China

Chenfu ***(胡经甫)is best known as the founder of modern entomotaxonomy of China,and famous for his monumental work-Catalogus Insectorum Sinensium(Cata-logue of Chinese insects).However,his contribution to biol-ogy in China is beyond *** few know that Chenfu Wu also held an *** and had been practic-ing medicine for years,and this experience led to his later interdisciplinary work on medical entomology.

关键词： return taxonomy beyond

Magnetic reconnection acceleration of astrophysical jets for different jet geometries

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Research in Astronomy and Astrophysics 2015年第4期15卷 475-482页

作者： A-ming Chen li-ming Rui College of Physical Science and Technology Central China Normal University

The acceleration mechanisms of relativistic jets are of great importance for understanding various astrophysical phenomena such as gamma-ray bursts, active galactic nuclei and microquasars. One of the most popular scenarios is that the jets are initially Poynting-flux dominated and succumb to magnetohydrodynamic instability leading to magnetic reconnections. We suggest that the reconnection timescale and efficiency could strongly depend on the geometry of the jet, which determines the length scale on which the orientations of the field lines change. In contrast to a usually- assumed conical jet, the acceleration of a collimated jet can be found to be more rapid and efficient （i.e. a much more highly saturated Lorentz factor can be reached） while the jets with lateral expansion show the opposite behavior. The shape of the jet could be formed due to the lateral squeezing on the jet by the stellar envelope of a collapsing massive star or the interaction of the jet with stellar winds.

关键词： gamma rays: bursts -- galaxies: jets -- MHD -- instabilities

A successful international cooperation with a bumpy start

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Protein & Cell 2011年第9期2卷 696-698页

作者： ming li Beijing Institutes of life Science Chinese Academy of SciencesBeijing 100101China

Science has no *** saying could not be more accurate in the case of infectious disease *** is publicly known that infectious diseases can travel,not only through infected people,animals or insects,but also by commercial *** the era of globalization,it is not possible to fight infectious diseases in one nation without worrying about what is happening elsewhere in the *** and re-emerging infectious diseases such as the outbreak of SARS in 2003 are likely to panic the Asian society at any time.

关键词： diseases likely travel

Zan Ding: founder of medical psychology in China

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Protein & Cell 2012年第1期3卷 8-9页

作者： ming li Beijing Institutes of life Science Chinese Academy of SciencesBeijing 100101China

Professor Zan Ding(1910–1968)(Fig.1)is a distinguished psychologist,the founder of medical psychology in China,and one of the important founders of the Chinese Academy of Sciences in practice,even though his name is known to few of *** in Nantong,Jiangsu Province,Zan Ding went to the National Central University(NCU)(now the Southeast University)in Nanjing to study psychology.

关键词： founder Southeast Nanjing

Establishment of a PCR Method for the Identification of Mink-Derived Components in Common Edible Meats

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Journal of Analysis and Testing 2022年第1期6卷 51-57页

作者： Jia-Mu Niu lin Cui Jin-Xia ai Guang-Xin Yuan li-Yuan Sun li-Jun Gao ming-Cheng li Department of Science and Technology Beihua UniversityJilin 132013China School of Technology Medicine Beihua UniversityJilin 132013China College of Pharmacy Beihua UniversityJilin 132013China

In this study,we established a DNA extraction method of meats and a PCR method for the detection of mink-derived compo-nents in common edible *** DNA of meats was extracted by a developed mink-derived component detection method and salting-out method,the specific primers of Cyt-b were designed,and the mink-derived components in common edible meats were identified by *** results showed that the concentration and purity of mink meat DNA extracted by the two methods could meet the requirements of *** mink meat DNA extracted by the developed mink DNA detection method had a high purity and *** mink-derived DNA in common edible meats could be *** specificity of mink meat DNA primer was proved to be good by repeated *** developed mink DNA detection method has the advantages of rapid detection and simple operation,which can be used for the identification of meat products in market and provide an experimental basis for the quality control of meat products.

关键词： Mink Cyt-b Molecular biology Identification of authenticity