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The Superlinear Convergence Analysis of a Nonmonotone BFGS Algorithm on Convex Objective Functions

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Acta Mathematica Sinica,English Series 2008年第1期24卷 35-42页

作者： Gong Lin YUAN zeng xin WEI School of Science East China University of Science and Technology Shanghai 200237 P. R. China College of Mathematics and Information Science Guangxi University Nanning 530004 P. R. China

We prove the superlinear convergence of a nonmonotone BFGS algorithm on convex objective functions under suitable conditions.

关键词： BFGS method superlinear convergence nonmonotone linesearch

Management of pesticide residues in China

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Journal of Integrative Agriculture 2015年第11期14卷 2319-2327页

作者： chen zeng-long DONG Feng-shou XU Jun LIU xin-gang ZHENG Yong-quan Institute of Plant Protection Chinese Academy of Agricultural Sciences

This paper reviewed management of pesticide residues in China including laws and regulations, the supervision system, the standard system, and the quality and safety of agricultural products. The process of establishment and internationalization of standards for pesticide residues were also discussed. Results indicate that the progress of the management of pesticide residues has been steadily made in China. However, the following aspects which refer to updates to regulations, supervising efficiency, standard system, risk assessment, international cooperation and communication, should be further improved. China should draw lessons from international experience, and then establish its own management system, which focuses on pesticides controls by strictly following relevant laws and technical standards to ensure the quality and safety of agricultural products.

关键词： pesticide residue standard system supervision system development trend

Continuous high-temperature rapid nanomanufacturing of electrocatalysts

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Nano Research 2025年第1期18卷 225-235页

作者： Xiaoyang Wang Ziyi Luo Baihua Cui Ziqi Fu Yanchang Liu Weidi Liu Jia Ding Jianrong zeng Yanan chenWenbin Hu School of Materials Science and Engineering Tianjin UniversityTianjin 300350China Australian Institute for Bioengineering and Nanotechnology The University of QueenslandSt.LuciaBrisbane 4072Australia Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

Encapsulating metal nanoparticles in carbon shells(Metal@C)to enhance catalytic activity and stability has been certified ***,most existing methods for preparing Metal@C are complex,time-consuming,and lack of *** this study,a novel method that couples the high-temperature shock(HTS)with ultrasonic spray pyrolysis is reported,which can realize facile and scalable production of various Metal@C through the pyrolysis of glucose and metal chloride *** proposed HTS ultrasonic spray pyrolysis offers several advantages,including compact size,short reaction time(~120 ms),and uniform *** the Ni@C-40 nanocomposite as an example,the ultrasmall Ni nanoparticles(~10 nm)with thin carbon protective shells(~2 nm)are uniformly dispersed in the carbon matrix and applied for oxygen evolution reaction(OER)in alkaline *** Ni@C-40 optimized by tuning the thickness of carbon shell exhibits significantly enhanced OER activity with low overpotential of 242 mV at 10 mA·cm^(-2) and stability,which is attributed to the optimized interactions between Ni nanoparticles and carbon *** method also shows promise for continuous pyrolysis synthesis of various extreme materials at ultra-high temperatures using alternative electric heating materials.

关键词： ultrasonic spray pyrolysis high-temperature shock carbon shell oxygen evolution reaction Metal@C nanocomposite

Mesenchymal stem cells for repairing glaucomatous optic nerve

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International Journal of Ophthalmology(English edition) 2024年第4期17卷 748-760页

作者： Bai-Yu Hu Mei xin Ming chen Ping Yu Liu-Zhi zeng Eye School of chengdu University of TCM Chengdu 610000Sichuan ProvinceChina Department of Ophthalmology Chengdu First People’s HospitalChengdu 610095Sichuan ProvinceChina

Glaucoma is a common and complex neurodegenerative disease characterized by progressive loss of retinal ganglion cells(RGCs)and ***,there is no effective method to address the cause of RGCs ***,studies on neuroprotective strategies for optic neuropathy have increased in recent *** replacement and neuroprotection are major strategies for treating glaucoma and optic *** medicine research into the repair of optic nerve damage using stem cells has Received considerable *** cells possess the potential for multidirectional differentiation abilities and are capable of producing RGCfriendly microenvironments through paracrine *** article reviews a thorough researches of recent advances and approaches in stem cell repair of optic nerve injury,raising the controversies and unresolved issues surrounding the future of stem cells.

关键词： stem cell glaucoma retinal ganglion cell optic nerve axon regeneration

Tissue factor expression and methylation regulation in differentiation of embryonic stem cells into trophoblast

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Asian Pacific Journal of Tropical Medicine 2014年第7期7卷 557-561页

作者： Lin-xin Liu Hui zeng En-Yi Liu Fang-Ping chen Department of Hematology Xiangya Hospital of Central South University

Objective:To explore tissue factor(TF)expression and methylation regulation in differentiation of human embryonic stem cells(hESCs)into ***:Differentiation of hESCs into trophoblast was induced by bone morphogenetic protein 4(BMP4).Expression of gene,protein of TF and DNA methylation at different time points during induction process was detected by RTPCT,Western blot,flow cytometry and MSP-PCR ***:The expression of mRNA,protein level of TF could be detected during directional differentiation of hESCs to trophoblast cells,semi methylation-semi non methylation expression appeared at TF DNA promoter region,and it showed decreased methylation level and increased non methylation level with formation of trophoblast cell and increased expression of ***:It shows that during differentiation of hESCs into trophoblast,the differential expression of TF is related with DNA methylation level,and it is changed with the methylation or non methylated *** provids new platform to furtherly explore the regulation mechanisms of specific expression of tissue factor in the process of the embryonic stem cell development.

关键词： Embryonic stem cells Trophoblast cell Tissue factor Methylation

Z-scheme systems of ASi_(2)N_4(A=Mo or W)for photocatalytic water splitting and nanogenerators

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Tungsten 2022年第1期4卷 52-59页

作者： Jian zeng Liang Xu xin Luo Tong chen Shuai-Hao Tang xin Huang Ling-Ling Wang Energy Materials Computing Center School of Energy and Mechanical EngineeringJiangxi University of Science and TechnologyNanchang 330013China Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education School of Physics and ElectronicsHunan UniversityChangsha 410082China Department of Applied Physics School of ScienceEast China Jiaotong UniversityNanchang 330013China

Z-scheme heterojunction catalysts have received great attention due to their efficient ability to separate electrons and ***,using the first-principles calculations,we designed a series of promising two-dimensional(2D)/2D Z-scheme systems with interlayer inequivalent,including MoSi_(2)N_(4)/MoSi_(2)N_(4),WSi_(2)N_(4)/WSi_(2)N_(4) and MoSi_(2)N_(4)/WSi_(2)N_(4).Molecular dynamics simulation and phonon dispersion show that they have sufficient environmental *** inequivalent structure between the layers caused the directional formation of built-in potentials,driving the transfer of net charge between layers,which greatly enhanced their catalytic *** smaller band gap and enhanced light absorption performance further revealed their perfect catalytic ***,all they met the redox potential requirements of water splitting in a range of pH 0-7,demonstrate they are very remarkable photocatalysts for H_(2)*** interestingly,they also have good sliding ferroelectricity,and the opposite built-in potential can be obtained by sliding between layers,which is very promising for future *** works may provide new insights into energy conversion devices.

关键词： Tungsten MoSi_(2)N_4 WSi_(2)N_4 Z-scheme systems Water splitting Nanogenerators First-principles calculations

POTENTIAL-pH DIAGRAMS OF Al-H_2O SYSTEM

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中国有色金属学会会刊：英文版 1997年第2期7卷 35-38页

作者： zeng, Wenming chen, Nianyi Chinese Acad of Sciences Shanghai China

ＰＯＴＥＮＴＩＡＬｐＨＤＩＡＧＲＡＭＳＯＦＡｌＨ２ＯＳＹＳＴＥＭ①ＺｅｎｇＷｅｎｍｉｎｇ，ＣｈｅｎＮｉａｎｙｉＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＭｅｔａｌｕｒｇｙ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃ... 详细信息

ＰＯＴＥＮＴＩＡＬｐＨＤＩＡＧＲＡＭＳＯＦＡｌＨ２ＯＳＹＳＴＥＭ①ＺｅｎｇＷｅｎｍｉｎｇ，ＣｈｅｎＮｉａｎｙｉＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＭｅｔａｌｕｒｇｙ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ，Ｓｈａｎｇｈａｉ２０００５０...

关键词： Al H 2O system potential pH diagram thermodynamics

THERMODYNAMICS OF THERMAL DECOMPOSITION OF ALUMINUM HYDROXIDE

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中国有色金属学会会刊：英文版 1997年第3期7卷 133-135页

作者： zeng, WM chen, NY chen, QY CHINESE ACAD SCI SHANGHAI INST METSHANGHAI 200050PEOPLES R CHINA CENT S UNIV TECHNOL DEPT CHEMCHANGSHA 410083PEOPLES R CHINA

ＴＨＥＲＭＯＤＹＮＡＭＩＣＳＯＦＴＨＥＲＭＡＬＤＥＣＯＭＰＯＳＩＴＩＯＮＯＦＡＬＵＭＩＮＵＭＨＹＤＲＯＸＩＤＥ①ＺｅｎｇＷｅｎｍｉｎｇ，ＣｈｅｎＮｉａｎｙｉＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＭｅｔａｌｕｒｇｙ，Ｃ... 详细信息

ＴＨＥＲＭＯＤＹＮＡＭＩＣＳＯＦＴＨＥＲＭＡＬＤＥＣＯＭＰＯＳＩＴＩＯＮＯＦＡＬＵＭＩＮＵＭＨＹＤＲＯＸＩＤＥ①ＺｅｎｇＷｅｎｍｉｎｇ，ＣｈｅｎＮｉａｎｙｉＳｈａｎｇｈａｉＩｎｓｔｉｔｕｔｅｏｆＭｅｔａｌｕｒｇｙ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃ...

关键词： Al(OH) 3 thermal decomposition thermodynamics

Thiourea Based Conjugated Polymer Fluorescent Chemosensor for Cu^＋ and Its Use for the Detection of Hydrogen Peroxide and Glucose

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Chinese Journal of Polymer Science 2016年第3期34卷 324-331页

作者： Xiu-li chen Wei-feng zeng Xiao-dong Yang xin-wei Lu 瞿金清刘瑞源 School of Chemistry and Chemical Engineering South China University of Technology School of Pharmaceutical Sciences Southern Medical University

A novel conjugated polymer, poly（1）, containing thiourea moieties in main chain is synthesized via Suzuki coupling reaction. The addition of cuprous ion quenches the fluorescence of poly（1）, whereas the fluorescence changes slightly upon addition of other metal ions, exhibiting the fluorescent almost turn-off sensing ability towards Cu~＋. When hydrogen peroxide was added to the solution containing poly（1） and Cu~＋, Cu~＋ was oxidized into Cu^（2＋）, resulting in the fluorescence recovery. The H_2O_2 released from glucose oxidation by glucose oxidase（GOD） also recovered the fluorescence of poly（1）/Cu~＋ solution. The results indicated that the poly（1）/Cu~＋ solution could serve as a sensing platform for hydrogen peroxide and glucose.

关键词： Conjugated polymer Thiourea Cuprous ion Hydrogen peroxide Glucose