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Structure of autophagy-related protein Atg8 from the silkworm Bombyx mori

ACTA CRYSTALLOGRAPhiCA SECTION F-STRUCTURAL BIOLOGY COMMUNICATIONS 2010年第7期66卷 787-790页

作者： Hu, Chen Zhang, Xuan Teng, Yan-Bin Hu, Hai-Xi Li, Wei-Fang Univ Sci & Technol China Hefei Natl Lab Phys Sci Microscale Hefei Peoples R China Univ Sci & Technol China Sch Life Sci Hefei Peoples R China

Autophagy-related protein Atg8 is ubiquitous in all eukaryotes. It is involved in the Atg8-PE ubiquitin-like conjugation system, which is essential for autophagosome formation. The structures of Atg8 from different species are very similar and share a ubiquitin-fold domain at the C-terminus. In the 2.40 angstrom crystal structure of Atg8 from the silkworm Bombyx mori reported here, the ubiquitin fold at the C-terminus is preceded by two additional helices at the N-terminus.

关键词： Atg8 autophagy Bombyx mori

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Design and Application of Dynamic Control System for Secondary Cooling of Billet Continuous Casting

Design and Application of Dynamic Control System for Seconda...

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2nd IEEE International Conference on Advanced Computer Control

作者： Liu, Wenhong Xie, Zhi Northeastern Univ Key Lab Integrated Automat Proc Ind Minist Educ Shenyang Peoples R China Northeastern Univ Coll Informat Sci & Engn Shenyang Peoples R China

ISBN: (纸本)9781424458479

The continuous casting process is used for the solidification of molten steel into semi-finished shapes. The technology of secondary cooling is extremely important for output of the casting machine and quality of the strand. In the paper, a dynamic control system is presented, including solidification model in the secondary cooling, feedforward control based on continuous temperature measurement in tundish and feedback control based on surface temperature measurement. The mathematical model of solidification process is developed according to the principle of solidification, and the model is verified by measuring billet shell thickness through nail shooting and sulfur printing. Primary water distribution is calculated by solidification model according to procedure parameters. And it is adjusted by the other two control strategies on line. The control system has been applied on some caster and billet quality is obviously improved, indicating that the dynamic control system is better than the conventional open-loop system.

关键词： billet continuous casting secondary cooling water model billet quality

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Numerical and Experimental Investigation of high-efficiency Axial-flow Pump

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Chinese Journal of Mechanical Engineering 2010年第1期23卷 38-44页

作者： Shi Weidong ZHANGDesheng GUAN Xingfan LENG Hongfei Technology and Research Center of Fluid Machinery Engineering Jiangsu University Zhenjiang 212013 China

The experimental investigation of axial-flow pump has been rapidly developed to meet the needs of South-to-North Water Diversion Project of china. Owing to the boundary conditions of hub, blade tip clearance, much of the physical phenomena and laws involved in this complex flow field can＇t be fully determined. The flow characteristics of the high efficiency axial-flow pump have been simulated by RNG k-e turbulence model and SIMPLEC arithmetic based on FLUENT software. Numerical results indicate that the data from the prediction show agreement with the experimental results, static pressure on pressure side of blades increases slightly at circumferential direction with radius increasing, and keep almost constant at the same radial while increasing gradually from inlet to exit on the suction side along flow direction at design conditions. The static pressure, total pressure and velocity at inlet, impeller outlet and vane outlet were measured by a five-hole probe, and a contrastive experiment was done to investigate the influence of hub leakage. The experimental results show that inlet flow is almost axial and the prerotation is very small at various conditions. The meridional velocity and circulation distribution are almost identical at impeller outlet at design conditions due to steady flow and high efficiency. The residual circulation exits at downstream of the guide vane, and the circumferential velocity component increases linearly from hub to tip at small flow rate conditions. Hub leakage in adjustable blades results in the decrease of the meridional velocity and circulation at blade exit near hub. The results of numerical simulation and experiments supply important flow structure information for the high-efficiency axial-flow pump.

关键词： axial-flow pump flow field multi-conditions high efficiency probe hub leakage

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COMPACT AND WIDEBAND PIFA FOR DCS/PCS/UMTS/WLAN COMMUNICATION SYSTEM

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MICROWAVE AND OPTICAL techNOLOGY LETTERS 2010年第5期52卷 1097-1100页

作者： Pang, Jiang-Yi Xiao, Shao-Qiu Chen, Shi-Tao Wang, Bing-Zhong Univ Elect Sci & Technol China Inst Appl Phys Chengdu 610054 Peoples R China

In this article, a compact and wideband planar inverted-F antenna is introduced. The bandwidths for s11 < -10 dB are up to 790 MHs (a fractional bandwidth of 38.2%) with bending a part of metal radiator down and notching a rectangle slot. Measured results show that the designed antenna can meet the requirements of the DCS/PCS/UMTS/WLAN communication system. (C) 2010 Wiley Periodicals, Inc. Microwave Opt technol Lett 52: 1097-1100, 2010;Published online in Wiley InterScience (***). DOI 10.1002/mop.25138

关键词： compact and wideband antenna PIFA DCS/PCS/UMTS/WLAN communication system

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A study on building an experimental system of PVDF sensor for structural local monitoring on a bridge model

A study on building an experimental system of PVDF sensor fo...

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Conference on Sensors and Smart Structures technologies for Civil, Mechanical, and Aerospace Systems 2010

作者： Yu, Yan Wang, Yang An, Yonghui Ou, Jinping Dalian Univ Technol Sch Elect Sci & Technol Dalian 116024 Peoples R China Harbin Inst Technol Sch Civil Engn Harbin 150090 Peoples R China Dalian Univ Technol Sch Civil Engn Dalian 116024 Peoples R China

ISBN: (纸本)9780819480620

Smart material structure originated from aerospace area has been a research hotspot in the application of civil engineering, shipping, and so on. For structural health monitoring of civil engineering, the research about high-performance sensing unit of smart material structure is very important, and this will possibly push further the development of health monitoring and diagnosis technique. As one of the piezoelectric materials belonging to smart materials, PVDF(Polyvinylidene Fluoride) film is widely concerned for its property advantages of low cost, good mechanical ability, high sensibility, resistance of corrosion. In this paper, for the validation of using PVDF for sensing unit for structural local monitoring of civil engineering, an experimental system of PVDF sensor for structural local monitoring on a bridge model is built. Based on the operating mechanism of PVDF, its measure circuit and characteristics(quasi-static and dynamic strain responding) are introduced. A bridge model is designed, and experiments have also been done for structural local health monitoring using PVDF. The experimental results show that, PVDF can finish impact response monitoring and damage detection of a bridge model, and the developed experimental system with simple and easy implement can be used for practical monitoring engineering.

关键词： PVDF smart material structural local monitoring bridge model experimental system

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Advances in estimation methods of vegetation water content based on optical remote sensing techniques

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Science china(technological Sciences) 2010年第5期53卷 1159-1167页

作者： ZHANG JiaHua1,XU Yun1,YAO FengMei2,WANG PeiJuan1,GUO WenJuan1,LI Li1 & YANG LiMin3 1 Chinese Academy of Meteorological Sciences,Beijing 100081,china 2 Graduated University of Chinese Academy of Sciences,Beijing 100049,china 3 USGS/EROS Data Center,South Dakota 57198,USA 1. Chinese Academy of Meteorological Sciences Beijing 100081 China2. Graduated University of Chinese Academy of Sciences Beijing 100049 China3. USGS/EROS Data Center South Dakota 57198 USA

Quantitative estimation of vegetation water content(VWC) using optical remote sensing techniques is helpful in forest fire as-sessment,agricultural drought monitoring and crop yield *** paper reviews the research advances of VWC retrieval using spectral reflectance,spectral water index and radiative transfer model(RTM) *** also evaluates the reli-ability of VWC estimation using spectral water index from the observation data and the *** on two main definitions of VWC-the fuel moisture content(FMC) and the equivalent water thickness(EWT),the retrieval accuracies of FMC and EWT using vegetation water indices are ***,the measured information and the dataset are used to estimate VWC,the results show there are significant correlations among three kinds of vegetation water indices(i.e.,WSI,NDⅡ,NDWI1640,WI/NDVI) and canopy FMC of winter wheat(n=45).Finally,the future development directions of VWC detection based on optical remote sensing techniques are also summarized.

关键词： optical remote sensing vegetation water content estimation method water index FMC EWT radiative transfer model

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CeO_2-supported vanadium oxide catalysts for soot oxidation:the roles of molecular structure and nanometer effect

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Journal of Rare Earths 2010年第2期28卷 198-204页

作者：刘坚赵震徐春明段爱军姜桂元 State Key Laboratory of Heavy Oil Processing China University of Petroleum

The nanometer CeO2 powder was prepared by the method of microwave-assisted heating hydrolysis,and the nanometer CeO2-supported or ordinary CeO2-supported vanadia catalysts with different vanadium loadings(atomic ratios:100V/Ce=0.1,1,4,10,and 20) were prepared by an incipient-wetness impregnation *** techniques(XRD,FT-IR,Raman and UV-Vis DRS) were utilized to characterize the structures of VOx/CeO2 *** results showed that the structures of CeO2-supported vanadium oxide catalysts de...

关键词： vanadium oxide catalyst CeO2 nanometer soot combustion rare earths

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Diversity of bile salt hydrolase activities in different lactobacilli toward human bile salts

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ANNALS OF MICROBIOLOGY 2010年第1期60卷 81-88页

作者： Jiang, Jinkang Hang, Xiaomin Zhang, Min Liu, Xianglong Li, Daotang Yang, Hong Shanghai Jiao Tong Univ Sch Life Sci & Biotechnol MOE Key Lab Microbial Metab Shanghai 200240 Peoples R China Shanghai Jiao Da Onlly Co Ltd Inst Biomed Shanghai 200233 Peoples R China

This study was conducted to evaluate the diversity of bile salt hydrolase (BSH) activities in eight species of lactobacilli. BSH activities were quantified based on the amount of taurine or glycine liberated from six main human bile sodium salts [glycocholic, glycodeoxycholic, glycochenodeoxycholic, taurocholic (TC), taurochenodeoxycholic, taurodeoxycholic] and a mixture of bile salts that resembled human bile. The eight species differed in their BSH activities. Specifically, Lactobacillus helveticus, Lactobacillus fermentum and Lactobacillus gallinarum had the ability to deconjugate taurine-conjugated bile salts, but not glycine-conjugated bile salts, which suggested that microbial BSHs recognize bile salts on both the cholate steroid nucleus and the amino acid moiety. Of the eight species evaluated, Lactobacillus acidophilus strains exhibited the highest specific BSH activity toward human bile salts, with the exception of TC. In addition, the L. acidophilus specific BSH activity toward glycine-conjugated bile salts was ten times higher than that toward taurine-conjugated bile salts. Moreover, the specific BSH activity of Lactobacillus plantarum did not vary significantly toward different bile salts, and Lactobacillus gasseri Am1 exhibited higher specific BSH activity toward TC than other lactobacilli. A comparison of bsh genes indicated that the LA-bshA, LA-bshB, LG-bsh and LP-bsh1 genes that encode the BSH enzymes are highly homologous (higher than 45%), while the LP-bsh2, LP-bsh3 and LP-bsh4 genes, which might not encode BSH enzymes, had lower similarity (lower than 26.3%).

关键词： Lactobacillus Bile salt hydrolase Human bile salts Secondary bile acid

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Spreading and direction of Gaussian-Schell model beam through a non-Kolmogorov turbulence

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OPTICS LETTERS 2010年第5期35卷 715-717页

作者： Wu, Guohua Guo, Hong Yu, Song Luo, Bin Beijing Univ Posts & Telecommun Sch Elect Engn Beijing 100876 Peoples R China Peking Univ CREAM Grp State Key Lab Adv Opt Commun Syst & Networks Beijing 100871 Peoples R China Peking Univ Inst Quantum Elect Sch Elect Engn & Comp Sci Beijing 100871 Peoples R China Beijing Univ Posts & Telecommun Minist Educ Key Lab Informat Photon & Opt Commun Beijing 100876 Peoples R China

We show that the far-field beam spreading and direction of partially coherent Gaussian-Schell model (GSM) beams are independent on the spatial coherence of the source through non-Kolmogorov atmospheric turbulence, which has potential applications in long-distance free-space optical communication. The effects of spatial coherence, exponent value alpha, and inner scale and outer scale of atmospheric turbulence on beam spreading are studied in details. The GSM beam has greater spreading for smaller inner scale or bigger outer scale through non-Kolmogorov turbulent atmosphere. (C) 2010 Optical Society of America

关键词： Atmospheric turbulence Coherence Free space optics Laser communications Power spectra Turbulence

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Significantly improved dehydrogenation of LiBH₄ destabilized by TiF₃

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ENERGY & ENVIRONMENTAL SCIENCE 2010年第4期3卷 465-470页

作者： Guo, Y. H. Yu, X. B. Gao, L. Xia, G. L. Guo, Z. P. Liu, H. K. Fudan Univ Dept Mat Sci Shanghai 200433 Peoples R China Univ Wollongong Inst Superconducting & Elect Mat Wollongong NSW 2522 Australia

The hydrogen storage properties of LiBH4 ball milled with TiF3 were investigated. It was found that the LiBH4-TiF3 mixture exhibited significantly improved dehydrogenation properties. For example, the LiBH4-TiF3 (mole ratio: 3 : 1) sample started to release hydrogen at around 100 degrees C, and the hydrogen desorption capacity reached 5.0 wt% at 250 degrees C. Furthermore, the dehydrogenated product can be partially rehydrogenated at 100 atm H-2 and 350 degrees C. X-Ray diffraction (XRD), infrared (IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) characterizations revealed that the decreased dehydrogenation conditions in the LiBH4-TiF3 system resulted from an exothermic reaction of 3LiBH(4) + TiF3 -> 3LiF + TiB2 + B + 6H(2), which improved both its thermodynamics and kinetics. As the above reaction is exothermic, the reverse reaction is not feasible, further investigations indicated that the rehydrogenation may be due to the formation of another borohydride.

关键词： Borohydrides hydrogen storage performance DEHYDROGENATORS Thermodynamics X-ray diffraction EXotHERMIC REACTIONS X-Ray Photoelectron Spectroscopy Hydrogen

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