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Search Results: 1 - 10 of 25616 matches for " Zhidan Dong "
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Contrasting Drought Tolerance in Two Apple Cultivars Associated with Difference in Leaf Morphology and Anatomy  [PDF]
Tuanhui Bai, Zhanying Li, Chunhui Song, Shangwei Song, Jian Jiao, Yuchen Liu, Zhidan Dong, Xianbo Zheng
American Journal of Plant Sciences (AJPS) , 2019, DOI: 10.4236/ajps.2019.105051
Abstract: Apple is one of the most important fruit trees in temperate zones, and is cultivated widely throughout the world. Drought stress affects the normal growth of apple tree, and further affects fruit yield and quality. The present study examined the effects of drought on photosynthesis and water use efficiency (WUE) of two apple cultivars (Honeycrisp and Yanfu 3) that differ in drought tolerance. The results showed that the photosynthetic rate decreased in response to drought stress for both cultivars, with significant differences in intensity. Values for net photosynthetic rate (Pn) in stressed Yanfu 3 remained significantly lower than in the controls, while, for Honeycrisp, only a slight drop in photosynthesis. Similarly, stomatal conductance (Gs), intercellular CO2 concentration (Ci), transpiration rate (Tr) were markedly reduced in Yanfu 3 under drought stress. However, Honeycrisp showed only minor changes. Under drought stress, the contents of Chl a, Chl b and Chl t in Yanfu 3 were all decreased significantly compared with the control. However, little difference in Honeycrisp was noted between stressed plants and controls. Values for WUE in stressed Yanfu 3 remained higher than in the controls from day 3 until the end of the experiment, while no significant difference was observed in Honeycrisp. Furthermore, Honeycrisp also exhibited superior physiological traits, as indicated by its anatomical and morphological characteristics. Therefore, we conclude that the superior drought tolerance of Honeycrisp was due to its anatomical and morphological characteristics, which possibly contributed to the maintenance of higher photosynthetic capacity than Yanfu 3.
40Ar-39Ar geochronology of Cenozoic Linzizong volcanic rocks from Linzhou Basin, Tibet, China, and their geological implications
Su Zhou,Xuanxue Mo,Guochen Dong,Zhidan Zhao,Ruizhao Qiu,Tieying Guo,Liangliang Wang
Chinese Science Bulletin , 2004, DOI: 10.1007/BF03184291
Abstract: Whole-rock and mineral separate Ar-Ar dating was carried out for the Linzizong volcanic rocks at Linzhou Basin in Tibet to constrain the time span of volcanism and the corresponding stratigraphic sequence. Sampling was based on detailed geologic mapping and stratigraphic sequence of Dianzhong, Nianbo, Pana Formations, systematically from the bottom to near the top. The results indicate that the Linzizong volcanic rocks erupted from Paleocene to middle of Eocene (64.43· 43.93 Ma). Among them, the Pana Formation formed from ca. 48.73 to 43.9 Ma, the Nianbo Formation around 54 Ma and the Dianzhong Formation from 64.4 to 60.6 Ma. In combination with evidence from the geochemical characteristics of the volcanic rocks, and from stratigraphy in southern Tibet, it is postulated that the age of the lowest member in the Dianzhong Formation of the Linzizong volcanic rock, which overlies unconformably the Late Cretaceous Shexing Formation, likely corresponds to the inception of the collision between Indian and Asian continents in southern Tibet.
Equitable chromatic threshold of complete multipartite graphs
Zhidan Yan,Wei Wang
Mathematics , 2012,
Abstract: A proper vertex coloring of a graph is equitable if the sizes of color classes differ by at most one. The equitable chromatic number of a graph $G$, denoted by $\chi_=(G)$, is the minimum $k$ such that $G$ is equitably $k$-colorable. The equitable chromatic threshold of a graph $G$, denoted by $\chi_=^*(G)$, is the minimum $t$ such that $G$ is equitably $k$-colorable for $k\ge t$. We develop a formula and a linear-time algorithm which compute the equitable chromatic threshold of an arbitrary complete multipartite graph.
Equitable coloring of Kronecker products of complete multipartite graphs and complete graphs
Zhidan Yan,Wei Wang
Mathematics , 2012,
Abstract: A proper vertex coloring of a graph is equitable if the sizes of color classes differ by at most 1. The equitable chromatic number of a graph $G$, denoted by $\chi_=(G)$, is the minimum $k$ such that $G$ is equitably $k$-colorable. The equitable chromatic threshold of a graph $G$, denoted by $\chi_=^*(G)$, is the minimum $t$ such that $G$ is equitably $k$-colorable for $k \ge t$. In this paper, we give the exact values of $\chi_=(K_{m_1,..., m_r} \times K_n)$ and $\chi_=^*(K_{m_1,..., m_r} \times K_n)$ for $\sum_{i = 1}^r m_i \leq n$.
Equitable chromatic threshold of Kronecker products of complete graphs
Zhidan Yan,Wei Wang
Mathematics , 2012,
Abstract: A proper vertex coloring of a graph is equitable if the sizes of color classes differ by at most 1. The equitable chromatic threshold of a graph $G$, denoted by $\chi_=^*(G)$, is the minimum $k$ such that $G$ is equitably $k^\prime$-colorable for all $k^\prime \ge k$. Let $G\times H$ denote the direct product of graphs $G$ and $H$. For $n\ge m\ge 2$ we prove that $\chi_=^*(K_{m} \times K_n)$ equals $\lceil\frac{mn}{m+1}\rceil$ if $n\equiv 2,...,m (\textup{mod} m+1)$, and equals $m\lceil\frac{n}{s^\star}\rceil$ if $n\equiv 0,1 (\textup{mod} m+1)$, where $s^\star$ is the minimum positive integer such that $s^\star \nmid n$ and $s^\star\ge m+2.$
Numerical calculation of the Riemann zeta function at odd integer arguments: A direct formula method
Qiang Luo,Zhidan Wang
Mathematics , 2014, DOI: 10.1007/s40096-015-0146-9
Abstract: In this article, we introduce a recurrence formula which only involves two adjacent values of the Riemann zeta function at integer arguments. Based on the formula, an algorithm to evaluate $\zeta$-values(i.e. the values of Riemann zeta function) at odd-integers from the two nearest $\zeta$-values at even-integers is posed and proved. The behavior of the error bound is $O(10^{-n})$ approximately where $n$ is the argument. Our method is especially powerful for the calculation of Riemann zeta function at large argument, while for smaller ones it can also reach spectacular accuracies such as more than ten decimal places.
Connectivity of Kronecker products by K2
Wei Wang,Zhidan Yan
Mathematics , 2011,
Abstract: Let $\kappa(G)$ be the connectivity of $G$. The Kronecker product $G_1\times G_2$ of graphs $G_1$ and $G_2$ has vertex set $V(G_1\times G_2)=V(G_1)\times V(G_2)$ and edge set $E(G_1\times G_2)=\{(u_1,v_1)(u_2,v_2):u_1u_2\in E(G_1),v_1v_2\in E(G_2)\}$. In this paper, we prove that $\kappa(G\times K_2)=\textup{min}\{2\kappa(G), \textup{min}\{|X|+2|Y|\}\}$, where the second minimum is taken over all disjoint sets $X,Y\subseteq V(G)$ satisfying (1)$G-(X\cup Y)$ has a bipartite component $C$, and (2) $G[V(C)\cup \{x\}]$ is also bipartite for each $x\in X$.
On the edge connectivity of direct products with dense graphs
Wei Wang,Zhidan Yan
Mathematics , 2011,
Abstract: Let $\kappa'(G)$ be the edge connectivity of $G$ and $G\times H$ the direct product of $G$ and $H$. Let $H$ be an arbitrary dense graph with minimal degree $\delta(H)>|H|/2$. We prove that for any graph $G$, $\kappa'(G\times H)=\textup{min}\{2\kappa'(G)e(H),\delta(G)\delta(H)\}$, where $e(H)$ denotes the number of edges in $H$. In addition, the structure of minimum edge cuts is described. As an application, we present a necessary and sufficient condition for $G\times K_n(n\ge3)$ to be super edge connected.
Characteristics and pressure-temperature conditions of Nimu metamorphic rocks, Tibet
西藏尼木变质岩特征及变质温压条件

SUN Kai,ZHOU Su,ZHAO ZhiDan,ZHANG LinLin,LIU Dong,
孙凯
,周肃,赵志丹,张琳琳,刘栋

岩石学报 , 2011,
Abstract: The Nimu metamorphic rocks are mainly composed of garnet biotite gneiss and biotite-plagioclase hornblende hornfels, which are exposed on the north side of Yarlung suture zone, southern Tibet. Our studies show that the rocks have metamorphosed to hornblende hornfels facies-pyroxene hornfels facies; garnet porphyroblasts with growth zonation, amphiboles are calcic amphiboles, most of the biotites are ferrobiotites and siderophyllites, most of the feldspars are oligoclases and andesine, with a small amount of...
Geochemistry and Origin of the Miocene Sailipu ultrapotassic rocks in western Lhasa block, Tibetan Plateau
青藏高原拉萨地块西部中新世赛利普超钾质岩石的地球化学与岩石成因

SUN ChenGuang,ZHAO ZhiDan,MO XuanXue,ZHU DiCheng,DONG GuoChen,ZHOU Su,DONG Xin,XIE GuoGang,
孙晨光
,赵志丹,莫宣学,朱弟成,董国臣,周肃,董昕,谢国刚

岩石学报 , 2007,
Abstract: 西藏拉萨地块西部赛利普中新世碰撞后超钾质火山岩由中国地质调查局地质填图首次发现,露头呈残丘状集中分布于中新世赛利普盆地,为一套含地幔包体的粗面岩,SiO_2含量中等(55.36%~6.70%),高K_2O含量(6.70%~7.50%)和K_2O/Na_2O比值(3.34~4.93)。岩石高MgO(6.4%~7.95%)、Cr(174×10~(-6)~421×10~(-6))、Ni(268×10~(-6)~337×10~(-6))和Mg~#(68~72),岩石为地幔部分熔融的原始岩浆。岩石高度富集大离子亲石元素(LILE)和轻稀土元素(LREE)、具有明显的Nb、Ta、Ti的负异常、富集放射性成因Sr、Pb及Nd同位素(~(87)Sr/~(86)Sr=0.727327~0.727803,~(206)Pb/~(204)Pb=18.705~18.779,~(207)Pb/~(204)Pb=15.731~15.761,~(208)Pb/~(204)Pb=39.775~39.919,~(143)Nd/~(144)Nd=0.511848~0.511861)、较低的ε_(Nd)值(≈15)和古老的Nd模式年龄(t_(DM)=2.2~2.4 Ga),这些地球化学特征揭示出赛利普的岩浆源区为富集地幔(EMⅡ)。将赛利普与拉萨地块西部其他地点和青藏高原北部的北羌塘和西昆仑地区出露的超钾质岩石进行综合对比表明,赛利普超钾质岩石可能为尖晶石相含金云母橄榄岩及少量石榴石相含金云母橄榄岩地幔的低度部分熔融的产物。拉萨地块超钾质岩石的形成可能与印度大陆岩石圈俯冲,或是俯冲的印度大陆地壳前缘撕裂和分段俯冲有关。
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