关于超越亚纯函数f(z)的微分多项式φ(z)f~2(z)f’(z)—1的零点

本文证明,其中,f(z)为超越亚纯函数,ψ(z)为非零亚纯函数,使得T(r,ψ)=S(r,f),其中,S(r,f)表示O{T(r,f)}(r→+∞),至多除去一个线性测度有限的r集。     

亚纯函数f(z)的微分多项式φψ(z)f(z)P(f)(z)的值分布

设k∈N,f(z)为复平面上的超越亚纯函数,φ(z)、ak-1(z),…,a0(z)为f(z)的小函数,且φ(z)≠0.置P(f)(z)=f(k)(z) ak-1(z),k-1((z) … a1(z)f'(z) a0f(z),且P(f)(z)不恒为常数.当k≤4时,满足Nk)(r,1/f)=S(r,f);k≥5时,满足N4)(r,1/f)=S(r,f),则T(r,f)＜20-N(r,1/φfP-1) S(r,f).     

亚纯函数f（z）的微分多项式φ（z）f（z）P（f）（z）的值分布

设k∈N，f（z）为复平面上的超越亚纯函数，φ（z）、ak-1（z），…，a0（z）为f（z）的小函数，且φ（z）≠0．置P（f）（z）=f^（k）（z）＋ak-1（z），f^（k-1）（z）＋…＋a1（z）f（z）＋a0，（z），且P（f）（z）不恒为常数．当k≤4时，满足Nr）（r，1/f）=S（r，f）；k≥5，满足N4）（r，1/f）=S（r，f），则T（r，f）〈20N^-（r，1/φfP-1）＋s（r，f）．     

亚纯函数涉及其一个微分单项式各IM分担一个值的一个唯一性

复平面上两个亚纯函数f(z)与g(z),若IM分担{∞},它们的一个导数IM分担1,则或者f(z)≡g(z),或者满足代数方程R(f,g)≡0,其中R(ω1,ω2)=ω1n(ω-1)m-ω1n(ω2-1)m.     

Falkner-Skan方程的某些新结果

著名的Falkner-Skan边界层方程f″′(η)+f″(η)f′(η)+λ[1一(f′)2(η)]=0,η∈(0,∞)及边界条件,(0)=f(0)=0,f′(∞)=1,0＜f′(η)＜1,η∈(0,∞)是流体力学领域最重要的方程之一.利用它的等价积分方程获得剪应力f″(η)新的估计.并改进了某些最近结果.     

运用ITS基因分析大鹏半岛海域石珊瑚系统发育关系

通过ITS基因特异扩增测序,对大鹏半岛海域46种石珊瑚ITS基因片段序列进行了比较分析。结果表明,该片段序列长度在674~806碱基对(bp)之间,A、T含量在40%~55.5%之间,大部分物种的序列碱基A、T含量小于G、C含量。46种造礁珊瑚的平均遗传距离为0.261。采用邻位连接(NJ)和最小进化(ME)法分别构建15种复合型珊瑚的5.8S r DNA系统发育树和28种坚实型珊瑚的ITS2系统发育树,结果显示15种复合型珊瑚的5.8S r RNA序列系统进化聚类结果较符合传统形态学分类结果,而28种坚实型珊瑚的ITS2序列系统进化聚类结果与传统形态学存在较大的差异,提示石珊瑚表型的变异性可能对传统分类存在影响。     

赣西北地区P波S波随频率衰减关系研究

利用2009-01—2013-05月发生在赣西北地区的233次M L≥1.0地震数字波形资料,采用尾波归一化方法计算了阳新台、九江台、修水台、高安台、宜春台的P波S波的衰减,结果显示,除修水台最佳流逝时间约为60 s外,其他四个台站的最佳流逝时间为30 s左右;九江-瑞昌震区内平均P波和S波的Q值分别为:Q P(f)=(15.97±1.87)f(1.66±0.06)和Q S(f)=(25.27±1.90)f(1.15±0.04)。     

边界层理论中混合对流方程的积分形式

通过引入一个独立的变量t和一个未知的函数w(t),给出了关于f(η)的三阶非线性边值问题f(")(η) (1 λ)f(η)f"(η) 2λ[1-f'(η)]f'(η)=0,0≤η＜ ∞.f(0)=0,f'(0)=β,f'( ∞)=1,的奇异积分形式,并得出上面方程凸解和凹解的不存在结果.     

与fL(f)相关的正规定则

设F是区域D内的一亚纯函数族,k是任一正整数,M为一正数,对于F中的每个函数f,只有至少t级零点,当1≤k≤4时,t=k 1,当k≥5时,t=k.置L(f)(z)=f(k)(z) ak-1(z)f(k-1)(z) … a1(z)f'(z) a0(z)f(z) b(z),a(z)≠0,a0(z),a1(z),…,ak-1(z),b(z)为D内的全纯函数,则有(i)若f(z)L(f)(z)=a(z)(=)|L(f)(z)|＜M,z∈D,则F在D内正规.(ii)若f(z)L(f)(z)=n(z)(=)|f(z)|＞M,z∈D,则F在D内正规.     

涉及微分多项式及例外函数的正规定则

设φ(z)≠0为区域D(c)C上的亚纯函数,a0(z),a1(z),…ak-1(z)为区域D上的全纯函数,k∈N.F为区域D上一族亚纯函数.对于任意的f(z)∈F,所有零点之级≥k 1,极点之级≥2.并且L(f)(z)=,k((z) ak-1(z)f(k-1)(z) …a1(z)f'(z) a0(z)f(z)≠φ(z),z∈D则F在D上正规.     

Preliminary study on plasma membrane fluidity of Psychrophilic Yeast Rhodotorula sp.NJ298 in low temperature

The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature.     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprehensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose     

JOURNAL OF OCEAN UNIVERSITY OF CHINA

<正>Copyright Submfnion of a roanusatpt inks:that the work described has not been published before(exoept In the form of an abstrW or as part of a published lecture,review,or thesis);that it is not under consideration for publication elsewhere that its publication has been approved by ail     

Information for Authors

<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo-     

Hydraulics and Hydrology in Mountain Areas

<正>The 35th IAHR World Congress was held in Chengdu,China from September 8 to September 132013.The title of the conference was:"The Wise Finds Pleasure in Water:Meandering through Water Science and Engineering".During the congress,1239 papers were presented in 139sessions for oral presentations and 7 sessions for poster presentations.After the Congress,a Committee was appointed to select some of the best papers presented at the Congress for publication,after a     

Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument

As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m.     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area.     

Foreword

正Rapid changes of Arctic sea ice cover have been in the focus of the international climate research community in recent years.Quite a few of nations have completed a large number of related surveys and research projects in the Arctic Ocean.Up to now,China has performed six research cruises to the Arctic Ocean resulting in a significant volume of research output.Improved knowledge on the atmospheree-sea ice-ocean interactions in the Arctic is a