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Search Results: 1 - 10 of 160349 matches for " LI Xiao-Jie "
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Equation of state of a solid based on thermal expandability
热膨胀型固体物态方程

Li Xiao-Jie,
李晓杰

物理学报 , 2002,
Abstract: 根据晶体热振动的非谐振效应,推导出了一种热膨胀形式的固体物态方程.与常用的Gr櫣neisen物态方程相比,该热膨胀物态方程在理论上说明了极高压下等熵线族趋近于冷压线的事实,并可很好地连接固体高压与常压性质.介绍了该物态方程的理论,定义了新的热力学函数,并对如何采用冲击Hugoniot方程拟合热膨胀形式的固体物态方程进行了介绍
A STUDY ON GEOGRAPHICAL VARIATION OF SEED AND GERMINATION BEHAVIOR OF PINUS ARMANDII
华山松种子及其发芽习性的地理变异研究

Li Xiao-jie,
李晓洁
,徐化成

植物生态学报 , 1991,
Abstract: 研究了自然分布区内6个不同种源华山松种子,发现存在显著的地理变异,并与植被地带有密切关联。温带草原地带(循化)和西部亚热带常绿阔叶林地带(会东)华山松林种子大而重,休眠性弱或不休眠;暖温带落叶阔叶林地带(蓝田)和东部亚热带常绿阔叶林地带(宜昌、江油)华山松林种子较小较轻,休眠性较强。在含油率及脂肪酸与氨基酸组成上亦存在随植被带不同而变异的情况。不论休眠深浅,冷层积(0—5℃)20天均可促进发芽。种子发芽的温度要求也因种源而异。
Inequality Condition for Grating Lobes of Planar Phased Array
Chang-Hong Liang;Long Li;Xiao-Jie Dang
PIER B , 2008, DOI: 10.2528/PIERB07121901
Abstract: This paper presents a general inequality for the grating lobes of the planar phased array, whether rectangular lattice or triangular lattice. And for the planar phased array with grating lobes, the maximum scanning angle is given.
On the Binding Energy Parameter $λ$ of Common Envelope Evolution
Xiao-Jie Xu,Xiang-Dong Li
Physics , 2010, DOI: 10.1088/0004-637X/716/1/114
Abstract: The binding energy parameter $\lambda$ plays an important role in common envelope (CE) evolution. Previous works have already pointed out that $\lambda$ varies throughout the stellar evolution, though it has been adopted as a constant in most of the population synthesis calculations. We have systematically calculated the binding energy parameter $\lambda$ for both Population I and Population II stars of masses $1-20 M_{\sun}$, taking into account the contribution from the internal energy of stellar matter. We present fitting formulae for $\lambda$ that can be incorporated into future population synthesis investigations. We also briefly discuss the possible applications of the results in binary evolutions.
Wind-Driven Evolution of White Dwarf Binaries to Type Ia Supernovae
Iminhaji Ablimit,Xiao-Jie Xu,Xiang-Dong Li
Physics , 2013, DOI: 10.1088/0004-637X/780/1/80
Abstract: In the single degenerate scenario for the progenitors of type Ia supernovae (SNe Ia), a white dwarf rapidly accretes hydrogen- or helium-rich material from its companion star, and appears as a supersoft X-ray source. This picture has been challenged by the properties of the supersoft X-ray sources with very low-mass companions and the observations of several nearby SNe Ia. It has been pointed out that, the X-ray radiation or the wind from the accreting white dwarf can excite wind or strip mass from the companion star, thus significantly influence the mass transfer processes. In this paper we perform detailed calculations of the wind-driven evolution of white dwarf binaries. We present the parameter space for the possible SN Ia progenitors, and for the surviving companions after the SNe. The results show that the ex-companion stars of SNe Ia have characteristics more compatible with the observations, compared to those in the traditional single degenerate scenario.
A Preliminary Population Viability Analysis of Cabot''''s Tragopan (Tragopan caboti)
黄腹角雉人工种群生存力初步分析

GUI Xiao-jie,XIANG Zuo-fu,LI Li,
桂小杰

动物学研究 , 2007,
Abstract: 黄腹角雉(Tragopan caboti)为我国特有珍稀雉类。目前,其野生种群仅分布于湖南东南部、浙江南部和西南部、江西、福建、广东北部和广西东北部,估计数量约为4000只。湖南省雉类繁殖基地自1997年通过对执法检查中获得的黄腹角雉个体进行收容、救护以及驯养繁殖工作以来,该人工种群已经成功繁殖4年,至2004年年底种群数量为131只。本文利用8年的驯养繁殖过程中获得的种群生态学参数,借助漩涡模型(Vortex9.51)对该种群100年内的动态进行了模拟。结果显示,按照过去8年的生存情况,该种群在100年灭绝的概率为97%。成年雌性的高死亡率和频繁的灾害是影响种群长期存活的两个关键因素。如果成年雌性的死亡率降低到饲养后3年(2002—2004年)时的水平,种群的灭绝概率降低至5%,如果同时控制灾害的发生,其灭绝概率降至0。增加环境容纳量没有降低种群的灭绝概率和增加其增长速度,但增加环境容纳量对100年后的种群数量和基因杂合度有明显的影响。在降低成年雌性死亡率和杜绝灾害发生的情况下,可以考虑对种群进行收获(用作向野外放养),每次收获的数量应该控制在5只成年雄性和5只成年雌,开始收获时间为种群连续繁殖10年以后。降低成年雌性的死亡率、杜绝食物中毒和火灾等灾害的发生以及增加环境容纳量是该人工饲养种群长期存活和发展壮大的重要管理手段。
Overexpression of a Cotton Gene That Encodes a Putative Transcription Factor of AP2/EREBP Family in Arabidopsis Affects Growth and Development of Transgenic Plants
Ying Zhou, Hui Xia, Xiao-Jie Li, Rong Hu, Yun Chen, Xue-Bao Li
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0078635
Abstract: In the study, a gene encoding a putative ethylene response factor of AP2/EREBP family was isolated from cotton (Gossypium hirsutum) and designated as GhERF12. Sequence alignment showed that GhERF12 protein contains a central AP2/ERF domain (58 amino acids) with two functional conserved amino acid residues (ala14 and asp19). Transactivation assay indicated that GhERF12 displayed strong transcription activation activity in yeast cells, suggesting that this protein may be a transcriptional activator in cotton. Quantitative RT-PCR analysis showed that GhERF12 expression in cotton was induced by ACC and IAA. Overexpression of GhERF12 in Arabidopsis affected seedling growth and development. The GhERF12 transgenic plants grew slowly, and displayed a dwarf phenotype. The mean bolting time of the transgenic plants was delayed for about 10 days, compared with that of wild type. Further study revealed that some ethylene-related and auxin-related genes were dramatically up-regulated in the transgenic plants, compared with those of wild type. Collectively, we speculated that GhERF12, as a transcription factor, may be involved in regulation of plant growth and development by activating the constitutive ethylene response likely related to auxin biosynthesis and/or signaling.
Isolation, Synthesis and Structures of Cytotoxic Ginsenoside Derivatives
Jun Lei,Xiang Li,Xiao-jie Gong,Yi-nan Zheng
Molecules , 2007, DOI: 10.3390/12092140
Abstract: Four known ginsenosides: ginsenoside-Rb1 (1), Rb3 (2), Rd (3) and Re (4) were isolated from the methanolic extract of the traditional Chinese medicine Panax ginseng C. A. Meyer. Further enzyme reactions and chemical modifications led us to obtain ginsenoside-M1 (5) and synthesize three novel mono-esters of ginsenoside-M1, ginsenoside-DM1 (6), PM1 (7) and SM1 (8) 30 - 50% of yield via a facile and green synthetic strategy. The structures were elucidated on the basis of extensive 1D- and 2DNMR, as well as high resolution ESI-TOF mass spectroscopic analyses. The isolated and synthetic compounds were tested in an anti-tumor bioassay, and compounds 5-8 showed considerable cytotoxicity (SRB) against several human cancer cell lines (breast cancer MCF-7, skin melanoma SK-MEL-2 and human ovarian carcinoma B16), but moderate effects on lung carcinoma COR-L23. The other ginsenosides showed no effects.
Prisoner's Dilemma Game on Two Types of Positively Correlated Networks

LIU Yong-Kui,LI Zhi,CHEN Xiao-Jie,WANG Long,

中国物理快报 , 2009,
Abstract: We study the effects of degree correlations on the evolution of cooperation in the prisoner's dilemma game with individuals located on two types of positively correlated networks. It is shown that the positive degree correlation can either promote or inhibit the emergence of cooperation depending on network configurations. Furthermore, we investigate the probability to cooperate as a function of connectivity degree, and find that high-degree individuals generally have a higher tendency to cooperate. Finally, it is found that small-degree individuals usually change their strategymore frequently, and such change is shown to be unfavourable to cooperation for both kinds of networks.
Evolutionary prisoner''s dilemma game on highly clustered community networks

Liu Yong-Kui,Li Zhi,Chen Xiao-Jie,Wang Long,

中国物理 B , 2009,
Abstract: This paper studies the evolutionary prisoner's dilemma game on a highly clustered community network in which the clustering coefficient and the community size can be tuned. It finds that the clustering coefficient in such a degree-homogeneous network inhibits the emergence of cooperation for the entire range of the payoff parameter. Moreover, it finds that the community size can also have a marked influence on the evolution of cooperation, with a larger community size leading to not only a lower cooperation level but also a smaller threshold of the payoff parameter above which cooperators become extinct.
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