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Synthesis of TP3 FragmentviaOne Pot Strategy and Its Immune Regulatory Activity

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Chemical Research in Chinese Universities 2005年第5期21卷 566-568页

作者： wang li-feng CHEN Jie SHAN Hui-jie li Wei Laboratory of Research on Biological Macromolecules College of Life Science Jilin University Changchun 130021 P. R. China

We have modified the previously described one-pot peptide synthesis method. The modified method has been successfully applied to the synthesis of TP3. Furthermore, the immune regulatory activity of TP3 has been characterized. The results show that the modified one-pot method can be used to synthesize the biological active peptide with the advantages of low cost and high productivity. Moreover, TP3 has a higher immune regulatory activity than TP5.

关键词： TP3 One-pot synthesis strategy Activity assay Immune regulatory activity

Simulation of Kelvin-Helmholtz Instability with Flux-Corrected Transport Method

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Communications in Theoretical Physics 2009年第5期51卷 909-913页

作者： wang li-feng YE Wen-Hua FAN Zheng-feng li Ying-Jun China University of Mining and Technology （Beijing） Beijing 100083 China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics P.O. Box 8009-12 Beijing 100088 China Department of Physics Zhejiang University Hangzhou 310028 China Center for Applied Physics and Technology Peking University Beijing 100871 China

The sixth-order accurate phase error flux-corrected transport numerical algorithm is introduced, and used to simulate Kelvin-Helmholtz instability. linear growth rates of the simulation agree with the linear theories of Kelvin Helmholtz instability. It indicates the validity and accuracy of this simulation method. The method also has good capturing ability of the instability interface deformation.

关键词： Kelvin Helmholtz instability flux-corrected transport algorithm numerical simulation

Incompressible Magnetohydrodynamic Kelvin-Helmholtz Instability with Continuous Profiles

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Chinese Physics Letters 2014年第3期31卷 23-26页

作者： ZHAO Kai-Ge wang li-feng YE Wen-Hua WU Jun-feng li Ying-Jun State Key Laboratory for Ceomechanics and Deep Underground Engineering China University of Mining and Technology Beijing 100083 Institute of Applied Physics and Computational Mathematics Beijing 100094 HEDPS Center for Applied Physics and Technology Peking University Beijing 100871 Department of Physic Zhejiang University Hangzhou 310027

Effects of a continuous magnetic field in the direction of streaming on the incompressible Kelvin–Helmholtz instability （KHI） are investigated by solving the linear ideal magnetohydrodynamic equations. It is found that the frequency of the KHI is not influenced by the magnetic field. The magnetic field strength effect decreases the linear growth of the KHI, while the magnetic field gradient scale length effect increases its linear growth. The KHI can even be completely suppressed when the magnetic field is strong enough. The linear growth rate approaches a maximum when the magnetic field gradient scale length is large enough.

关键词： MAGNETIC fields RESEARCH MAGNETOHYDRODYNAMICS MAGNETIC confinement MAGNETISM PHYSICS research

Evaluation of drought tolerance in ZmVPP1-overexpressing transgenic inbred maize lines and their hybrids

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Journal of Integrative Agriculture 2020年第9期19卷 2177-2187页

作者： JIA Teng-jiao li Jing-jing wang li-feng CAO Yan-yong MA Juan wang Hao ZHANG Deng-feng li Hui-yong Institute of Cereal Crop Henan Academy of Agricultural SciencesZhengzhou 450002P.R.China Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100089P.R.China

The vacuolar proton-pumping pyrophosphatase gene(VPP)is often used to enhance plant drought tolerance via genetic *** this study,the drought tolerance of four transgenic inbred maize lines overexpressing ZmVPP1(PH4CV-T,PH6WC-T,Chang7-2-T,and Zheng58-T)and their transgenic hybrids was evaluated at various *** normal and drought conditions,the height and fresh weight were greater for the four transgenic inbred maize lines than for the wild-type(WT)controls at the germination and seedling ***,the transgenic plants exhibited enhanced photosynthetic efficiency at the seedling *** irrigated and non-irrigated fields,the four transgenic lines grew normally,but with increased ear weight and yield compared with the WT ***,the ear weight and yield of the transgenic hybrids resulting from the PH4CV-T×PH6WC-W and Chang7-2-T×Zheng58-W crosses increased in the non-irrigated *** results demonstrated that the growth and drought tolerance of four transgenic inbred maize lines with improved photosynthesis were enhanced by the overexpression of ***,the Chang7-2 and PH4CV transgenic lines may be useful for future genetic improvements of maize hybrids to increase drought tolerance.

关键词： inbred maize lines drought stress ZmVPP1 photosynthesis

Design of an Indirect-Drive Pulse Shape for ~1.6 MJ Inertial Confinement Fusion Ignition Capsules

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Chinese Physics Letters 2014年第4期31卷 89-92页

作者： wang li-feng WU Jun-feng YE Wen-Hua FAN Zheng-feng HE Xian-Tu Institute of Applied Physics and Computational Mathematics Beijing 100094 HEDPS Center for Applied Physics and Technology Peking Universir~y Beijing 100871

We present a design of indirect-drive pulse shape for inertial confinement fusion ignition capsules using laser energy 1.6 MJ with a moderate gain （~10） on the Shenguang 1V laser facility. The trade-off fuel compression （pressure） for resistance to the hydrodynamic instability （HI） in the recent high-foot （HF） implosion campaign [Dittrieh T t et al Phys. Rev. Lett. 112 （2014）055002] is recovered. The proposed design modifies the ＂main＂ pulse shape, which features a decompression-recompression step for the fuel shell resulting in higher areal density than that of the ＂simple＂ HF design, and thereby approaches the conditions required for ignition avoiding at the expense of more laser energy while holding the HI under control.

关键词： INERTIAL confinement fusion HYDRODYNAMICS DEUTERIUM TRITIUM SHOCK waves

On the Second Harmonic Generation through Bell-Plesset Effects in Cylindrical Geometry

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Chinese Physics Letters 2014年第4期31卷 85-88页

作者： GUO Hong-Yu YU Xiao-Jin wang li-feng YE Wen-Hua WU Jun-feng li Ying-Jun State Key Laboratory for Geomeehanics and Deep Underground Engineering China University of Mining and Technology Beijing 100083 Institute of Applied Physics and Computational Mathematics Beijing 100094 HEDPS Center for Applied Physics and Technology Peking University Beijing 100871 Department of Physics Zhejiang University Hangzhou 310027

Generation of the second harmonic initiated by Bell-Plesset effects in a cylindrical geometry is studied analytically. For an initial single-mode velocity perturSation, the second-order mode-coupling formula is obtained by expanding the perturbation displacement and velocity potential up to the second-order accuracy. It is found that the initially symmetric interface evolves into a significant bubble-spike asymmetric pattern. The second-order solutions clearly show that the amplitude of the spike grows faster than that of the buSble. The temporal evolutions of the amplitudes of the 5ubSie and spike are dependent on the interface velocity Vo. The larger interface velocity leads to the smaller amplitude of the perturbation at an arbitrary interface position in a cylindrically convergent geometry.

关键词： INERTIAL confinement fusion PERTURBATION (Mathematics) SUPERNOVAE LAPLACE'S equation STOCHASTIC convergence

Drought-induced responses of organic osmolytes and proline metabolism during pre-flowering stage in leaves of peanut (Arachis hypogaea L.)

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Journal of Integrative Agriculture 2017年第10期16卷 2197-2205页

作者： ZHANG Ming wang li-feng ZHANG Kun liU feng-zhen WAN Yong-shan Key Laboratory of Crop Ecophysiology and Farming System Ministry of Agriculture/College of Agronomy Shandong Agricultural University Tai'an 271018 P.R. China

Peanut （Arachis hypogaea L.）, an improtant oil crop, usually encounters drought stress in the process of growth and development, especially at pre-flowering stage. In order to gain insight into the drought tolerance potentials based on osmolyte accumulation and metabolism of proline aspects of peanut, pot experiments were conducted with a split-plot design in Tai＇an, Shangdong Province, China in 2013 and 2014. Pre-flowering drought （PFD） stress and optinum irrigation （control, CK） were served as the main plots and the two peanut cultivars Shanhua 11 and Hua 17 served as sub-plots. Shanhua 11 was drought-tolerant cultivar and Hua 17 was drought-sensitive. The content of soluble sugars, soluble protein, free proline and other free amino acids, the activities of enzymes involved in proline metabolism, and malondialdehyde （MDA） content and ion leakage were all investigated in the two cultivars at pre-flowering stage. Results showed that PFD stress significantly increased the levels of soluble protein, free proline and free amino acid, and increased Al-pyrroline-5-car- boxylate synthetase （P-5-CS, EC 2.***.2.11） activity in the leaves of drought-tolerant and drought-sensitive cultivars. The activity of proline dehydrogenase （proDH）（EC 1.***.99.8） decreased under PFD stress in both cultivars. The leaves of the tolerant cultivar maintained higher increments of osmolyte levels, lower increments of MDA content and ion leakage, as well as a higher increased proportion of P-5-CS activity and higher inhibited proportion of proDH activity under water stress compared with the drought-sensitive cultivar. The study suggests that proline accumulation in peanut leaves under PFD can be explained by the higher enhanced activities of P-5-CS and higher inhibition of proDH. The results will provide useful information for genetic improvement of peanut under drought tolerance.

关键词： drought stress peanut (Arachis hypogaea L.) △1-pyrroline-5-carboxylate synthetase (P-5-CS) 5-ornithinetransaminase (OAT) proline dehydrogenase (proDH)

Repair approach for DMC images based on hierarchical location using edge curve

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Science in China(Series F) 2009年第1期52卷 23-31页

作者： PAN Jun wang Mi li DeRen feng TianTian State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University Wuhan 430079China

The color composite digital mapping camera （DMC） images are produced by the post-processing software of Z/I imaging. But the failure of radiometric correction in post-processing leads to residual radiometric differences between CCD images, which then affect the quality of the images in further applications. This paper, via analyzing the characters and causes of such a phenomenon, proposes a repair approach based on hierarchical location using edge curve. The approach employs a hierarchical strategy to locate the transition area and seam-line automatically and then repair the image through the global reconstruction between CCD images and the local reconstruction in the transition area. Experiments indicate that the approach proposed by this paper is feasible and can improve the quality of images effectively.

关键词： digital mapping camera (DMC) images post-processing mosaicking image repair

Microstructure and properties characteristic during interrupted multi-step aging in Al-Cu-Mg-Ag-Zr alloy

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Rare Metals 2011年第4期30卷 419-423页

作者： ZHUBaohong XIONG Baiqing ZHANG Yong＇an ZHANG Jianbo wang feng li Zhihui State Key Laboratory of Nonferrous Metals and Processes General Research Institute for Nonferrous Metals Beijing 100088 China

The effects of interrupted multi-step aging on the microstructure and properties of A1-Cu-Mg-Ag-Zr alloy were studied by tensile, hardness, electrical conductivity tests and transmission electron microscopy （TEM）. Interrupted multi-step aging delayed the peak aging time compared to one-step aging and kept the same levels of hardness, electrical conductivity, ultimate tensile strength （UTS）, yield strength （YS） and elongation as those of the T6 temper alloy while increased the fracture toughness notably. Ω phase and a little θ＇ phase precipitated and grew simultaneously in the process of one-step aging at 160℃. During the second-step aging at 65℃ of interrupted multi-step aging, no TEM characteristic of Ω precipitates could be found. During the third step of interrupted multi-step aging, Ω began to dominate the microstructure like what happened in the process of one-step aging. The difference of properties between the T6 temper and the interrupted multi-step aged alloys might be related to the different precipitation sequences in the process of the two heat treatment technologies.

关键词： aluminum copper alloys heat treatment microstructure fracture toughness aging