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A NEW APPROACH TO THE PROBLEM OF GRAIN IMPINGEMENTIN MODELLING RECRYSTALLIZATION TEXTUREDEVELOPMENT

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Acta Metallurgica Sinica(English Letters) 1997年第4期10卷 342-348页

作者： L.Q Chen Z. Yingand Z.D. Liang(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, china)(department of Materials Science and Engineering, Northeastern university, Shenyang 110006, china) Inst of Metal Research Chinese Acad of Sciences Shenyang China

The recrpstallization texture evolution of an interstitial-free (IF) sheet steel dumngannealing is modellcd by Monte Carlo method. A new approach to the problem ofgraln impingement in modelling the development of recrystallization texture is fullydescri6ed, which is based on detailed site analysis and the introduction of proba6ilityvalue Pij for the tro nsition between dtherently oriented groins. As an illustmtive *** theory of orlented nucleation and two critical sizes of nuclei are selected to modelthe mechanism of recrystallization texture formation. The results simulated for severalrepresentative texture components are in agreement with the known experiments.

关键词： IF steel recrystallization texture modelling Monte Carlo method site analysis

Selective nickel-electrocatalyzed benzylic C-H oxygenation of functionalized alkyl arenes

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Chinese Chemical Letters 2024年第2期35卷 396-401页

作者： Shunyao tang Siyi Wang Dongmei Zhang Xinxing Zhang Guang Yang Yanwei Wang Youai Qiu State Key Laboratory of Elemento-Organic Chemistry Frontiers Science Center for New Organic MatterCollege of ChemistryNankai UniversityTianjin 300071China College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)Renewable Energy Conversion and Storage Center (RECAST)Frontiers Science Center for New Organic MatterNankai UniversityTianjin 300071China

Herein, a site-selective paired electrochemical C–H oxidation of functionalized alkyl arenes promoted by nickel catalyst is disclosed. A Ni(Ⅱ)-dioxygen species formed in situ efficiently enable the oxidation process under mild conditions with a broad substrate scope with excellent functional group compatibilities,such as free carboxylic acid, aldehyde, halogen(including aryl iodide), amide and amino acid. The use of the nickel catalyst in combination with water provides a safe, green and economical method for oxidation of a range of molecules varying in complexity and drug derivatives, demonstrating its potential application in organic synthesis and the pharmaceutical industry. Reaction outcomes and mechanistic studies revealed the key role of the in situ Ni(Ⅱ)-dioxygen species for the subsequent oxidation of C(sp^(3))–H bonds,and short-lived reactive intermediates(aryl radical cation) was rapidly captured by the combination of a bipolar ultramicroelectrode(BUME) with nano-electrospray ionization mass spectrometry.

关键词： Electrochemical C-H oxidation Functionalized alkyl arenes Paired nickel-electrocatalysis H_(2)O oxidation Ketones

Grain-filling strategies of wheat of contrasting grain sizes under various planting patterns and irrigation levels

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The Crop Journal 2024年第3期12卷 897-906页

作者： Zimeng Liang Jingyi Feng Jiayu Li Yangyang tang Tiankang He Vinay Nangia Yang Liu College of Agronomy Northwest A&F UniversityYangling 712100ShaanxiChina International Center for Agricultural Research in the Dry Areas Rabat 999055Morocco

In a study comparing grain filling and yield in a large-and a small-grain-size wheat cultivar under two planting patterns and two irrigation regimes,plastic-covered ridge and furrow planting with sprinkler irrigation increased grain filling and yield in both *** largest contributors to grain yield were an extended active grain-filling period in Shuangda 1 and an increased mean grain-filling rate in XN538.

关键词： Plastic-covered ridge and furrow cultivation Sprinkler irrigation Wheat Grain size Grain filling

Cloning and characterization of 37 kDa laminin receptor precursor in pearl oyster,Pinctada fucata

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Progress in Natural Science:Materials International 2008年第2期18卷 233-238页

作者： Yaopeng Fu a,Liping Xie a,b,,Rongqing Zhang a,b,a Institute of Marine Biotechnology,department of Biological Sciences and Biotechnology,Tsinghua university,Beijing 100084,china b Protein Science Laboratory of the Ministry of Education,Tsinghua university,Beijing 100084,china Institute of Marine Biotechnology Department of Biological Sciences and Biotechnology Tsinghua University Beijing 100084 China Protein Science Laboratory of the Ministry of Education Tsinghua University Beijing 100084 China

A 1063 bp cDNA clone encoding a putative 37 kDa laminin receptor precursor (37 kDa LRP) is isolated from the mantle tissue of pearl oyster,Pinctada fucata. The amino acid sequence predicted from the cDNA sequence is 301 residues long,with a calculated molec-ular mass of 33.5 kDa. RT-PCR analysis shows that 37 kDa LRP mRNA is especially highly expressed in the mantle while widely expressed in several tissues. In situ hybridization analysis reveals that 37 kDa LRP is expressed in the outer epithelial cells of the mantle edge,suggesting its involvement in cell proliferation and secretion in P. fucata. The identification and characterization of 37 kDa LRP in the pearl oyster will help us to further understand the signal transduction in the processes of mantle epithelial cell proliferation and tissue formation.

关键词： 37 kDa laminin receptor precursor Mantle epithelial cell Pearl oyster

Hopf bifurcation of nonlinear incidence rates SIR epidemiological models with stage structure

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Communications in Nonlinear Science and Numerical Simulation 2001年第4期6卷 205-209页

作者： Zhonghua LU, Xianning LIU and Lansun CHEN Institute of mathematics, Academy of mathematics and System Sciences, Chinese Academy of Sciences, Beijing 100080, china e-mail: lschen@*** Xi'an Statistic College, Xi'an 710061, china e-mail: lzh Institute of mathematics Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China Xi'an Statistic College Xi'an 710061 China department of mathematics Southwest China Normal University Chongging 400715 China

A nonlinear incidence rates SIR epidemiological model with stage structure is considered. Different to bilinear incidence rates models, there exist two positive equilibria and whether or not the disease will eventuall... 详细信息

关键词： Hopf bifurcation SIR epidemiological model. disease-free equilibrium endemic equilibrium

Conservation laws of some soliton equations with self-consistent sources

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Journal of Shanghai university(English Edition) 2011年第3期15卷 157-165页

作者：李琪张大军陈登远 department of mathematics College of Sciences Shanghai University department of mathematics East China Institute of Technology

Infinitely many conservation laws for some （1＋1）-dimension soliton hierarchy with self-consistent sources are constructed from their corresponding Lax pairs directly. Three examples are given. Besides, infinitely many conservation laws for Kadomtsev-Petviashvili （KP） hierarchy with self-consistent sources are obtained from the pseudo-differential operator and the Lax pair.

关键词： Ablowitz-Kaup-Newell-Segur (AKNS) hierarchy with self-consistent sources Kaup-Newell (KN) hierarchy with self-consistent sources Ablowitz-Ladik (AL) hierarchy with self-consistent sources Kadomtsev-Petviashvili (KP) hierarchy with self-consistent sources conservation laws

Regioselective aminohalogenation of β-nitrostyrenes using NCS and NBS as nitrogen/halogen sources

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Science china Chemistry 2010年第1期53卷 140-146页

作者： ZHI SanJun1,2,SUN Hao2,LIN Chen2,ZHANG GuangQian2,LI GuiGen4 & PAN Yi2,3 1 department of Chemistry,Huaiyin Normal university,Huai’an 221003,china 2 School of Chemistry and Chemical Engineering,Nanjing university,Nanjing 210093,china 3 State Key Lab of Coordination Chemistry,Nanjing university,Nanjing 210093,china 4 department of Chemistry and Biochemistry,Texas Tech university,Lubbock,Texas 79409-1061,USA 1. department of Chemistry Huaiyin Normal University Huai’an 221003 China2. School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China4. Department of Chemistry and Biochemistry Texas Tech University Lubbock Texas 79409-1061 USA3. State Key Lab of Coordination Chemistry Nanjing University Nanjing 210093 China

Aminohalogenation reaction of β-nitrostyrenes with N-halosuccinimides(N-chloro and N-bromosuccinimides) has been successfully conducted by using nickel acetate as a catalyst in the presence of potassium carbonate and succinimide as *** reaction was easily performed at room temperature under nitrogen gas protection to give dihalorinaed haloamino products in good to excellent yields(60%-98%).The structure has been confirmed by X-ray crystal structure analysis.

关键词： aminohalogenation vicinal haloamines β-nitrostyrenes NBS NCS

An Experimental Study on Homoharringtonine Liposome and Glaucoma Filtration Surgery

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眼科学报 1999年第1期15卷 51-54,50页

作者： Dawei Peng, Kerning Yu, Shujun Zeng, Yongping Li Jianxian Lin, Yuping Wu, Wenbing ZhouZhongshan Ophthalmic Center , Sun Yat-sen university of Medical Sciences , guangzhou 510060 , china department of Pharmacology, Sun Yat-sen university of Medical Sciences , guangzhou 510089, china Zhongshan Ophthalmic Center Sun Yat-sen University of Medical Sciences Guangzhou 510060 China

Purpose: To observe the inhibitory action of homoharringtonine liposome during the healing process of wounds in the filtering sitesMethods: posterior sclerectomies were performed in 14 rabbits. Postoperatively one eye of each rabbit received subconjunctival injections of HH liposome and fellow eye received saline injection in a randomized masked ***; Fourteen days after operation the IOP of experimental eyes reduced significantly (P < 0.01) as compared with the controlled eyes, and the number of remaining filtering blebs increased noticeably (P< 0.05). Pathohistological examination revealed that the number of fibroblasts per square micron in the filtering sites and the thickness of the scars in the center of the filtering sites of the experimental eyes were less than those of the controlled eyes. No serious ocular toxic and side effects were *** : This experiment suggests that homoharringtonine liposome can markedly inhibit the scar formation of filtering sites after glaucoma

关键词：滤光手术青光眼脂质体

Impact of High Sodium Diet on Neovascularization and Osseointegration around Titanium Implant:An in Vivo and in Vitro Study

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Biomedical and Environmental Sciences 2024年第7期37卷 739-753页

作者： Keyuan Xu Xiaoting tang Yun Xiang Yiding Shen Zhennan Deng Pingping Ma Xinkun Shen department of Orthopaedics The Third Affiliated Hospital of Wenzhou Medical University(Ruian People’s Hospital)Wenzhou 325016ZhejiangChina School and Hospital of Stomatology Wenzhou Medical UniversityWenzhou 325027ZhejiangChina

Objective A high sodium(HS)diet is believed to affect bone metabolism *** its impact on osseointegration of titanium(Ti)implants holds significant implications for postoperative dietary management of implanted *** This investigation probed the impact of sodium ions(Na^(+))on neovascularization and osteogenesis around Ti implants in vivo,utilizing micro-computed tomography,hematoxylin and eosin staining,and immunohistochemical ***,in vitro experiments assessed the effects of varied Na^(+)concentrations and exposure durations on human umbilical vein endothelial cells(HUVECs)and MC3T3-E1 *** In vivo,increased dietary sodium(0.8%-6.0%)led to a substantial decline in CD34 positive HUVECs and new bone formation around Ti implants,alongside an increase in inflammatory *** vitro,an increase in Na^(+)concentration(140-150 mmol/L)adversely affected the proliferation,angiogenesis,and migration of HUVECs,especially with prolonged *** MC3T3-E1 cells initially exhibited less susceptibility to high Na^(+)concentrations compared to HUVECs during short-term exposure,prolonged exposure to a HS environment progressively diminished their proliferation,differentiation,and osteogenic *** These findings suggest that HS diet had a negative effect on the early osseointegration of Ti implants by interfering with the process of postoperative vascularized bone regeneration.

关键词： High-sodium Implants Vascularization Osseointegration