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Performance Study of Copper-Bearing High Strength Ship-Hull Steel

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Journal of Iron and Steel Research International 2011年第S1期18卷 422-426页

作者： LUO Xiao-bing,YANG cai-fu,SU Hang,CHAI Feng (Central Iron and Steel Research Institute,Institute for Structural Materials,Beijing 100081,China) Cent Iron & Steel Res Inst Inst Struct Mat Beijing 100081 Peoples R China

The variation in microstructures and the mechanical properties of a Copper-bearing high strength ship-hull steel at different aging temperature was *** peak strength was obtained at the aging temperature of 450 ℃,which was attribute to the plentiful Cu precipitates and a bit of Nb(C,N).In the over-aged condition,both the partial recovery of matrix and the coarsening of Cu particles (10-60 nm) caused the loss of the yield strength (YS) and the improvement of *** increase of the ultimate tensile strength (UTS) at aging temperature above 660℃ due to the formation of alloy-rich island structure transformed from the austenite phase upon cooling,and complied with the mixture *** copper-bearing ship steel can exhibit an excellent combination of high strength and toughness while aging at 660 ℃ for 2 hours (UTS-818 MPa,YS-745 MPa,Akv-161 J at-40℃).

关键词： copper-bearing aging HSLA ship-hull steel

Structure　of　Activity　Sites　in　Perovskite－type　Complexs　Oxides　LaMnO_3＋λ　for　Total　Oxidation　of　Methane

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Chinese Chemical Letters 1996年第10期7卷 960-961页

作者： Zi Yi ZHONG Jian GONG Qi Jie YAN Xian cai fu(Department of Chemistry, Hunan Normal University, Changsha, 410081)(Department of Chemistry, Nanjing University, Nanjing, 210093) Department of Chemistry Hunan Normal University Changsha 410081 Department of Chemistry Nanjing University Nanjing 210093

Nanometer oxide LaMnO3+λ and its counterparts with large particle size were comparatively studied for total oxidation of methane. XPS, TPR and nonstoichiometric oxygen (λ)analysis results identify that the nanometer chide contains more high valence cations, to which the adjacent lattice oxygen are responsible for total oxidation of methane at low temperature.

关键词： Activity Sites Structure Perovskite Complexs type

In-situ synthesis of quantum dots in the nucleus of live cells

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National Science Review 2024年第3期11卷 172-182页

作者： Yusi Hu Zhi-Gang Wang Haohao fu Chuanzheng Zhou Wensheng cai Xueguang Shao Shu-Lin Liu Dai-Wen Pang State Key Laboratory of Medicinal Chemical Biology Frontiers Science Centre for New Organic MatterTianjin Key Laboratory of Biosensing and Molecular Recognition Research Centre for Analytical Sciences College of Chemistry School of Medicine and Frontiers Science Centre for Cell Responses Nankai University Haihe Laboratory of Sustainable Chemical Transformations

The cell nucleus is the main site for the storage and replication of genetic material, and the synthesis of substances in the nucleus is rhythmic, regular and strictly regulated by physiological processes. However,whether exogenous substances, such as nanoparticles, can be synthesized in situ in the nucleus of live cells has not been reported. Here, we have achieved in-situ synthesis of CdSxSe1-xquantum dots（QDs） in the nucleus by regulation of the glutathione（GSH） metabolic pathway. High enrichment of GSH in the nucleus can be accomplished by the addition of GSH with the help of the Bcl-2 protein. Then, high-valence Se is reduced to low-valence Se by glutathione-reductase-catalyzed GSH, and interacts with the Cd precursor formed through Cd and thiol-rich proteins, eventually generating QDs in the nucleus. Our work contributes to a new understanding of the syntheses of substances in the cell nucleus and will pave the way for the development of advanced ‘supercells’.

关键词： glutathione live cell nucleus quantum dot intracellular synthesis

Catalytic anode surface enabling in situ polymerization of gel polymer electrolyte for stable Li metal batteries

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Nano Research 2024年第6期17卷 5216-5223页

作者： Guocheng Li Kang Liang Yuanjian Li Xiangrui Duan Lin fu Zhao cai Zhaofu Zhang Jiangnan Dai Yongming Sun Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China The Institute of Technological Sciences Wuhan UniversityWuhan 430074China Faculty of Materials Science and Chemistry China University of Geoscience(Wuhan)Wuhan 430074China

Employing quasi-solid-state gel polymer electrolyte(GPE)instead of the liquid counterpart has been regarded as a promising strategy for improving the electrochemical performance of Li metal ***,the poor and uneven interfacial contact between Li metal anode and GPE could cause large interfacial resistance and electrochemical Li stripping/plating inhomogeneity,deteriorating the electrochemical ***,we proposed that the functional component of composite anode could work as the catalyst to promote the in situ polymerization reaction,and we experimentally realized the integration of polymerized-dioxolane electrolyte and Li/Li_(22)Sn_(5)/LiF composite electrode with low interfacial resistance and good stability by in situ catalyzation ***,the reaction kinetics and stability of metallic Li anode were significantly *** a demonstration,symmetric cell using such a GPE-Li/Li_(22)Sn_(5)/LiF integration achieved stable cycling beyond 250 cycles with small potential hysteresis of 25 mV at 1 mA·cm^(−2)and 1 mAh·cm^(−2),far outperforming the counterpart regular GPE on pure *** with LiNi0.5Co0.3Mn0.2O2,the full cell with the GPE-Li/Li_(22)Sn_(5)/LiF integration maintained 85.7%of the original capacity after 100 cycles at 0.5 C(1 C=200 mA·g^(−1)).Our research provides a promising strategy for reducing the resistance between GPE and Li metal anode,and realizes Li metal batteries with enhance electrochemical performance.

关键词： catalyzation polymerization interface resistance interfacial stability Li metal batteries electrochemical performance

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双重不确定性系统的跟踪与辨识

系统工程理论与实践 2012年第4期32卷 839-846页

作者：钱富才李江赵平西安理工大学自动化与信息工程学院西安710048 西安交通大学机械制造系统工程国家重点实验室西安710054

对于具有未知参数的高斯白噪声随机线性系统,提出了一个有效的自适应控制策略.控制器一方面能够控制系统朝着期望的目标运行,另一方面又能对未知参数进行辨识.对于给定的效用函数,能够在跟踪与辨识间获得最佳平衡.仿真结果表明了该方法... 详细信息

对于具有未知参数的高斯白噪声随机线性系统,提出了一个有效的自适应控制策略.控制器一方面能够控制系统朝着期望的目标运行,另一方面又能对未知参数进行辨识.对于给定的效用函数,能够在跟踪与辨识间获得最佳平衡.仿真结果表明了该方法的有效性.

关键词：不确定性系统鲁棒控制自适应控制

ent-Kaurane diterpenoids from the plant Wedelia trilobata

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Natural Products and Bioprospecting 2013年第3期3卷 107-111页

作者： Bing-Ji Ma Chun-Nan Wen Yuan Gao fu-cai Ren Fei Wang Ji-Kai Liu Agronomy College of Henan Agricultural University Zhengzhou 450002China BioBioPha Co. Ltd.Kunming 650201China State Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China

Four new ent-kaurane diterpenoids,namely,3α-tigloyloxypterokaurene L_(3)(1),ent-17-hydroxy-kaura-9(11),15-dien-19-oic acid(2),and wedelobatins A(3)and B(4),together with 11 known ent-kaurane diterpenoids(5-15),were isolated from the ethanol extract of Wedelia *** the structures of 1-15 were elucidated on the basis of spectroscopic studies.

关键词： ent-kaurane diterpenoids Wedelia trilobata phytochemical investigation

New role and molecular mechanism of Gadd45a in hepatic fibrosis

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World Journal of Gastroenterology 2016年第9期22卷 2779-2788页

作者： Liang Hong Qing-Feng Sun Ting-Yan Xu Yang-He Wu Hui Zhang Rong-Quan fu fu-Jing cai Qing-Qing Zhou Ke Zhou Qing-Wei Du Dong Zhang Shuang Xu Ji-Guang Ding Department of Infectious Diseases the Third Affiliated Hospital to Wenzhou Medical University Department of Infectious Diseases The First Peoples Hospital of Xiaoshan Disrict Department of Infectious Diseases Tianjin Baodi Hospital

AIM: To investigate the role of Gadd45a in hepatic fibrosis and the transforming growth factor (TGF)-beta/ Smad signaling pathway. METHODS: Wild-type male BALB/c mice were treated with CCl4 to induce a model of chronic liver injury. Hepatic stellate cells (HSCs) were isolated from the liver of BALB/c mice and were treated with small interfering RNAs (siRNAs) targeting Gadd45a or the pcDNA3.1-Gadd45a recombinant plasmid. Cellular alpha-smooth muscle actin (alpha-SMA), beta-actin, type I collagen, phospho-Smad2, phospho-Smad3, Smad2, Smad3, and Smad4 were detected by Western blots. The mRNA levels of alpha-SMA, beta-actin, and type I collagen were determined by quantitative real-time (qRT)-PCR analyses. Reactive oxygen species production was monitored by flow cytometry using 2,7-dichlorodihydrofluorescein diacetate. Gadd45a, Gadd45b, anti-Gadd45g, type I collagen, and SMA local expression in liver tissue were measured by histologic and immunohistochemical analyses. RESULTS: Significant downregulation of Gadd45a, but not Gadd45b or Gadd45g, accompanied by activation of the TGF-beta/Smad signaling pathways was detected in fibrotic liver tissues of mice and isolated HSCs with chronic liver injury induced by CCl4 treatment. Overexpression of Gadd45a reduced the expression of extracellular matrix proteins and alpha-SMA in HSCs, whereas transient knockdown of Gadd45a with siRNA reversed this process. Gadd45a inhibited the activity of a plasminogen activator inhibitor-1 promoter construct and (CAGA)(9) MLP-Luc, an artificial Smad3/4-specific reporter, as well as reduced the phosphorylation and nuclear translocation of Smad3. Gadd45a showed protective effects by scavenging reactive oxygen species and upregulating antioxidant enzymes. CONCLUSION: Gadd45a may counteract hepatic fibrosis by regulating the activation of HSCs via the inhibition of TGF-beta/Smad signaling.

关键词： Antioxidant Gadd45a Hepatic fibrosis Hepatic stellate cells Transforming growth factor-beta/Smad signaling

Experimental simulation of the Unruh effect on an NMR quantum simulator

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Science China(Physics,Mechanics & Astronomy) 2016年第3期59卷 48-55页

作者： Fang Zhou Jin Hong Wei Chen Xing Rong Hui Zhou Ming Jun Shi Qi Zhang Chen Yong Ju Yi fu cai Shun Long Luo Xin Hua Peng Jiang Feng Du Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics University of Science and Technology of China High Magnetic Field Laboratory Chinese Academy of Sciences Academy of Mathematics and Systems Science Chinese Academy of Sciences

The Unruh effect is one of the most fundamental manifestations of the fact that the particle content of a field theory is observer dependent. However, there has been so far no experimental verification of this effect, as the associated temperatures lie far below any observable threshold. Recently, physical phenomena, which are of great experimental challenge, have been investigated by quantum simulations in various fields. Here we perform a proof-of-principle simulation of the evolution of ferrnionic modes under the Unruh effect with a nuclear magnetic resonance （NMR） quantum simulator. By the quantum simulator, we experimentally demonstrate the behavior of Unruh temperature with acceleration, and we fiarther investigate the quantum correlations quantified by quantum discord between two fermionic modes as seen by two relatively accelerated observers. It is shown that the quantum correlations can be created by the Unrtfia effect from the classically correlated states. Our work may provide a promising way to explore the quantum physics of accelerated systems.

关键词： quantum simulation Unruh effect quantum correlations

Hierarchical self-assembly of a collagen mimetic peptide （PKG）n（POG）2n（DOG）n via electrostatic interactions

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Frontiers of Computer Science 2011年第3期5卷 293-300页

作者： Ying SHI Song WANG Xiu-Mei WANG Qiang cai fu-Zhai CUI Heng-De LI Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

A new type of collagen mimetic peptide, （PKG）n（POG）2n（DOG）n, with charged-domain ends had been designed and successfully prepared in this work, which self-assembled into collagen-like triple helices homotrimers. The collagen-like homo- trimers underwent higher level of self-assembly via static electrical interaction between positive and negative domains. Transmission electron microscope （TEM） examinations showed three typical morphologies of homotrimer assembly, which were defined as film, bicontinuous and fibril morphology in this paper. The film was formed in the initial stage and gradually transformed to bicontinuous or fibril morphology to improve stability of the assemblies or decrease surface energy. furthermore, mechanism of assembly process was proposed based on TEM observations and theoretical analyses of packing equation.

关键词： collagen mimetic peptide assembly morphology