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Optical control of magnetism in complex oxides: A new frontier

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Science China(Physics,Mechanics & Astronomy) 2019年第11期62卷 151-152页

作者： HangWen Guo jian shen Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

The manipulation of spin is a central concept in the field of spintronics. Among several methods, the light control of magnetism (or magneto-optics) has a unique versatility, since it can stimulate a wide range of interactions (1)The lightmagnetism interactions were first considered in the definition of the Faraday effect, in 1845;moreover.

关键词： A new frontier Optical control of magnetism in complex oxides

Rdh13 deficiency weakens carbon tetrachloride-induced liver injury by regulating Spotl4 and Cyp2e1 expression levels

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Frontiers of Medicine 2019年第1期13卷 104-111页

作者： Xiaofang Cui Benting Ma Yan Wang Yan Chen Chunling shen ying Kuang jian Fei Lungen Lu Zhugang Wang State Key Laboratory of Medical Genomics Research Center for Experimental MedicineRuijin Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200025China Shanghai Research Center for Model Organisms Shanghai 201203China Department of Gastroenterology Shanghai First People s HospitalShanghai Jiao Tong UniversityShanghai 200080China

Mitochondrion-localized retinol dehydrogenase 13 (Rdh13) is a short-chain dehydrogenase/reductase involved in vitamin A metabolism in both humans and mice. We previously generated Rdh13 knockout mice and showed that Rdh13 deficiency causes severe acute retinal light damage. In this study, considering that Rdh13 is highly expressed in mouse liver, we further evaluated the potential effect of Rdh13 on liver injury induced by carbon tetrachloride (CC14). Although Rdh13 deficiency showed no significant effect on liver histology and physiological functions under regular culture, the Rdh13^-/- mice displayed an attenuated response to CCl4-induced liver injury. Their livers also exhibited less histological changes and contained lower levels of liver-related metabolism enzymes compared with the livers of wild-type (WT) mice. Furthermore, the Rdhl3 1 mice had Rdh13 deficiency and thus their liver cells were protected from apoptosis, and the quantity of their proliferative cells became lower than that in WT after CC14 exposure. The ablation of Rdhl3 gene decreased the expression levels of thyroid hormone-inducible nuclear protein 14 (Spot14) and cytochrome P450 (Cyp2el) in the liver, especially after CC14 treatment for 48 h. These data suggested that the alleviated liver damage induced by CC14 in Rdh13^-/- mice was caused by Cyp2el enzymes, which promoted reductive CC14 metabolism by altering the status of thyroxine metabolism. This result further implicated Rdhl3 as a potential drug target in preventing chemically induced liver injury.

关键词： retinol dehydrogenase 13 carbon tetrachloride acute liver injury Cyp2el Spot14

Enantiomer-selective Living Polymerization of rac-Phenyl Isocyanide Using Chiral Palladium Catalyst

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Chinese Journal of Polymer Science 2018年第7期36卷 799-804页

作者： jian Huang Ling shen Hui Zou Na Liu Department of Polymer Science and Engineering School of Chemistry and Chemical Engineering Hefei University of Technology and Anhui Key Laboratory of Advanced Catalytic Materials and Reaction Engineering

We report the polymerization of phenyl isocyanides with the chiral palladium（II） initiating system. The resulting polymers with optically active properties were obtained by polymerization of the racemic isocyanide monomer （rac-1）, and enantiomerically unbalanced polymerization of the monomer was found, providing substantial evidence for the enantiomer-selective polymerization of rac- 1 mediated through chiral catalyst. A comparison between the enantiomerically pure monomers, 4-isocyanobenzoyl-L-alanine decyl ester （1 s） and 4-isocyanobenzoyl-D-alanine decyl ester （1 r）, revealed a drastic discrepancy in the reactivity ratio of their homopolymerizations. It turned out that the monomer reactivity ratio of ls was higher than that of lr with chiral ligands. The results clearly demonstrated the inclination for incorporation of the ls enantiomer during the polymerization process and thus resulted in the enantiomer-selective polymerization in this system. The effects of the catalyst chirality on the optically active properties of polymerization were investigated, and it was concluded that the formation of higher-ordered conformation with a handed helicity might be attributed to the chiral induction of chiral palladium（II） catalyst. Moreover, the polymers obtained through the enantiomer-selective polymerization of the enantiomerically pure monomer were with a significant improvement of the optical activity if the chirality of the monomer and the catalyst matched with each other.

关键词： Enantiomer-selective polymerization Kinetic resolution Chiral sulfinamide bisphosphine Polyisocyanides Living polymerization

Physical neural networks with self-learning capabilities

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Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 23-42页

作者： Weichao Yu Hangwen Guo jiang Xiao jian shen State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China Zhangjiang Fudan International Innovation Center Fudan UniversityShanghai 201210China Department of Physics Fudan UniversityShanghai 200433China Shanghai Research Center for Quantum Sciences Shanghai 201315China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

Physical neural networks are artificial neural networks that mimic synapses and neurons using physical systems or *** networks harness the distinctive characteristics of physical systems to carry out computations effectively,potentially surpassing the constraints of conventional digital neural networks.A recent advancement known as“physical self-learning”aims to achieve learning through intrinsic physical processes rather than relying on external *** article offers a comprehensive review of the progress made in implementing physical self-learning across various physical *** learning strategies that contribute to the realization of physical self-learning are *** challenges in understanding the fundamental mechanism of learning,this work highlights the progress towards constructing intelligent hardware from the ground up,incorporating embedded self-organizing and self-adaptive dynamics in physical systems.

关键词： self-learning physical neural networks neuromorphic computing physical learning

Triplet excitation dynamics of β-carotene studied in three solvents by ns flash photolysis spectroscopy

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Chinese Chemical Letters 2017年第1期28卷 83-88页

作者： ying Jia ying Shi Peng Wang jian-Ping Zhang Department of Chemistry Renmin University of China Beijing 100872 China

Upon anthracene-sensitizing, triplet excitation dynamics of β-carotene（β-Car） were studied in nhexane, in methanol, and in acetonitrile, respectively, by ns flash photolysis spectroscopy. In n-hexane,only the bleaching of the ground state absorption（GSB） and the excitation triplet（^3Car＊） absorption were observed, and there were no cationic species detected. In both methanol and acetonitrile, similar excitation dynamics were observed, i.e.,^3Car＊ having a similar lifetime to that in n-hexane, and the immediate generation of the cation dehydrodimer（^#[Car]2^＋） upon excitation following transformation into the radical cation Car＊^＋, since Car＊^＋ has much longer lifetime in acetonitrile than in methanol. The results prove that both solvent and carotenoid structure determine the triplet excitation mechanism.

关键词： β-Carotene Triplet excitation dynamics Solvent effect ns Flash photolysis

A new flavonoid from Selaginella tamariscina

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Chinese Chemical Letters 2009年第5期20卷 595-597页

作者： jian Feng Liu Kang Ping Xu De jian jiang Fu Shuang Li jian shen ying Jun Zhou Ping sheng Xu Bin Tan Gui Shan Tan School of Pharmaceutical Sciences Central South University Changsha Hunan 410013 China Xiangya Hospital of Central South University Changsha Hunan 410008 China Xiangnan University Chenzhou Itunan 423000 China

6-（2-Hydroxy-5-acetylphenyl）-apigenin （1）, a new flavonoid with a phenyl substituent, was first isolated from Selaginella tamariscina. Its structure was elucidated on the basis of 1D and 2D NMR as well as ESI-HR-M... 详细信息

关键词： Selaginella tamariscina Flavonoids 6-(2-Hydroxy-5-acetylphenyl)-apigenin

Synthesis of Dialkyl-substituted Terminal Olefin

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Chinese Chemical Letters 2005年第9期16卷 1213-1216页

作者： shen Yong REN Bao jian shen Qiao Xia GUO State Key Laboratory of Heavy Oil Processing The Key Laboratory of Catalysis of CNPC andFaculty of Chemical Science and Engineering China University of Petroleum Beijing 102249

Dialkyl-substituted terminal olefins were synthesized from the coupling reaction of a-olefins which were catalyzed by zirconocene dichloride/methylalumoxane （MAO） catalyst system under mild condition. High yield was gained and no other oligmer was detected. It was found that the ratio of AI/Zr is responsible for the selectivity of product.

关键词： Zirconocene dichloride methylalumoxane dialkyl-substituted terminal olefin coupling reaction

Synthesis of novel aromatic polyimides containing bulky side chain for vertical alignment liquid crystals

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Chinese Chemical Letters 2008年第3期19卷 359-362页

作者： jian Wang ying Han Wang State Key Laboratory of Polymer Materials Engineering of China College of Polymer Science and Engineering Sichuan University Chengdu 610065 China

In this study, a novel 4-（4-octyloxybenzoyloxy）biphenyl-3′,5′-diaminobenzoate and polyimides based on it were synthesized. The polyimide with mesogenic unit side chain exhibited excellent vertical alignment for nematic liquid crystal （LC）. The pretilt angles of LCs above 89° were kept after the rubbing process with 220 mm rubbing strength. The polyimide films as the alignment layer were baked at 120℃ for 12 h, the vertical alignment of LCs was still uniform and stable. Meanwhile, the UV-vis spectra of the noyel polyimide films showed the high transparency in a visible wave length.

关键词： Polyimide Liquid crystal Vertical alignment

Size-effect on Ni electrocatalyst:The case of electrochemical benzyl alcohol oxidation

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Nano Research 2023年第1期16卷 202-208页

作者： jian Zhong Yongli shen Pei Zhu Shuang Yao Changhua An Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringTianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory of Advanced Functional Porous Materials Institute for New Energy Materials&Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China

The nanoparticles(NPs)of Ni with different sizes endows its distinctive physical and chemical properties,which represents a typical strategy for the development of high-performance ***,the size effect of metallic Ni-NPs on electrocatalytic performance remains ***,the Ni-NPs with different sizes supported on nitrogen doped carbon(NC)has been synthesized by controlling the pyrolysis temperature,leading to the synthesis of Ni@NC-500(8.3 nm),Ni@NC-280(1.9 nm)and Ni@NC-200(1.0 nm).The electrooxidation of benzyl alcohol(BA)over these nanocatalysts shows the yield of benzoic acid was 99%,82%,55%on Ni@NC-280,Ni@NC-200 and Ni@NC-500,*** experimental and theoretical simulation demonstrate that the difference in the adsorption strength of reactant molecules by Ni-NPs is responsible for their different performance,where the Ni@NC-280 exhibits an optimal adsorption configuration between Ni@NC-280 electrode and *** work provides a new angle for designing and synthesizing efficient electrocatalysts,which may be extended to the exploration of various promising electrocatalytic systems.

关键词： size effect electro-oxidation Ni nanoparticles benzyl alcohol