Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2020 ( 2 )

2019 ( 74 )

2018 ( 680 )

2017 ( 738 )

Custom range...

Search Results: 1 - 10 of 45931 matches for " TIAN Yao-hua "
All listed articles are free for downloading (OA Articles)
Page 1 /45931
Display every page Item


系统科学与数学 , 1985,
Abstract: 二阶拟线性椭圆型方程的非平凡解的存在性在文献1—3]中讨论过。本文目的是要讨论高阶情况。本文的椭圆型条件(F_3)要比3]的弱,且关于(PS)条件的证明也简化了。然后,我们建立了 Pohozaev 型恒等式,用来说明本文关于 F_u 的增长性的限制(见下面的(F_2))在一般情况下是必要的。设(?)是 R~n 中有光滑边界(?)的有界区域,E 表示 Sobolev 空间 W_0~(m,p)(?),我们考虑齐次 Dirichlet 问题
Correlational study of hypoxia-inducible factor-1 and pharmacoresistance of Sprague-Dawley rat temporal lobe epilepsy model kindled by coriaria lactone
Lei CHEN,Yao-hua LI,Tian-fang ZENG,Dong ZHOU
Medical Journal of Chinese People's Liberation Army , 2012,
Abstract: Objective  To investigate changes in the expression of hypoxia-inducible factor-1 (HIF-1) in different brain regions in a pharmacoresistance model of temporal lobe epilepsy, and explore its relation to the expression of drug resistance gene/protein multidrug-resistance-gene1(MDR1)/P-glycoprotein (Pgp). Methods  A kindling model of pharmacoresistant temporal lobe epilepsy was developed by injecting Sprague-Dawley (SD) rats with coriaria lactone (CL). Normal SD rats were injected with normal sodium (NS) served as control group. The expressions of HIF-1, MDR1/Pgp in brain tissues were detected by real-time fluorescence-based quantitative polymerase chain reaction (RQ-PCR), immunohistochemistry (IHC), Western blotting, respectively. Results  IHC showed that the expressions of HIF-1 in neurons and glial cells were higher in the hippocampus and temporal cortex than in other brain regions in kindled rats, and the regional distribution of HIF-1 was similar to that of Pgp. RQ-PCR and Western blotting showed that the expressions of HIF-1 in the hippocampus and temporal cortex were higher in kindled group than in control group (P < 0.05), and the expressions of MDR1/Pgp in gene and protein levels were consistent with the alterations of HIF-1 in both groups. Conclusion  HIF-1 expressions in hippocampus and temporal cortex in kindled rats are higher than those in control rats, and it corresponds to the regional distribution of Pgp. The correlation of HIF-1 and MDR1/Pgp expressions indicates that HIF-1 may be related to the drug resistance of refractory temporal lobe epilepsy.
Effects of nitrogen fertilization and planting density on Ageratina adenophora growth and its competitive traits

TIAN Yao-hua,FENG Yu-long,LIU Chao,

生态学杂志 , 2009,
Abstract: 紫茎泽兰(Ageratina adenophora)是我国西南热带亚热带地区危害最严重的外来入侵植物之一。本研究在野外设置不同氮肥供给水平和种植密度下的紫茎泽兰、拔毒散(Sida szechuensis)、伏生臂形草(Brachiaria decumbens)和非洲狗尾草(Setaria anceps)的单种和紫茎泽兰与其他3种植物混种的人工群落,从植被-土壤相互作用的角度分析紫茎泽兰的入侵机制。结果表明:单种时4种受试植物均表现了对氮营养的响应,随氮肥水平的升高,根冠比降低,比叶面积升高;通过比较总生物量增幅,氮响应能力非洲狗尾草>伏生臂形草>紫茎泽兰>拔毒散。混种时受试植物与紫茎泽兰的生物量比和株高也表明非洲狗尾草的竞争能力>伏生臂形草>紫茎泽兰>拔毒散;与拔毒散混种的紫茎泽兰以及与 紫茎泽兰混种的伏生臂形草和非洲狗尾草的种内竞争随种植密度的增大而增大,导致种间竞争能力下降,在高种植密度下对混种物种的抑制作用减弱。紫茎泽兰在氮响应能力、竞争能力和表型可塑性方面均强于本地种,可能与其入侵机制有关;牧草的氮响应能力和竞争能力强于紫茎泽兰,其中非洲狗尾草又强于伏生臂形草,可能更适宜于入侵地的替代控制。
Interval Scaling Algorithm and its Concept Lattice Construction from Extended Formal Context

LIU Yao-hua,ZHOU Wen,LIU Zong-tian,

计算机科学 , 2009,
Abstract: The existing concept lattice model is unable to process data which contains not only fuzzy information but also scalar and Boolean information.The extended formal context includes many kinds of information such as scalar,fuzzy,Boolean,and interval.Therefore,how to build concept lattice from extended formal context,is a meaningful study.An interval scaling algorithm is proposed here to deal with the extended formal context and a corresponding concept lattice construction method is produced.In the end of this...
Influence of Growth Light Intensity on Photosynthetic Characteristics in Six Varieties of Hevea brasiliensis Seedlings

TIAN Yao-hua,YUAN Hui-fang,LONG Yun-feng,WEI Li-ping,

热带亚热带植物学报 , 2012,
Abstract: Abstract: Six Hevea brasiliensis varieties seedlings adapted for 1 year were grown under different light intensity, such as 100%, 50%, 25% and 5% natural light, the response characteristics of leaf photosynthetic system to light intensity and CO2 concentration were studied. The results showed that six H. brasiliensis varieties showed strong adaptability to different light environments. Under different light intensities, the maximum photosynthetic rate (Pmax), light compensation point (LCP), dark respiration rate (Rd), triose phosphate utilization rate (TPU), maximum carboxylation rate (Vcmax ) and maximum electron transport rate (Jmax) and chlorophyll content (Chl) showed significant differences (P<0.05), and did not light saturation point (LSP) and AQY (apparent quantum efficiency). Under the same light intensity, leaf maximum photosynthetic rate (Pmax), dark respiration rate (Rd), triose phosphate utilization rate (TPU), the largest electron transfer rate (Jmax) and chlorophyll content (Chl) among six varieties had significant difference (P<0.05), and did not light compensation point (LCP), maximum carboxylation rate (Vcmax) and apparent quantum efficiency (AQY). Comprehensive comparison of parameters in six H. brasiliensis varieties, RRIM600, Yunyan77-4 and PR107 are fit for planting environment with relative light intensity of 100%-50%, while Yunyan77-2, GT1 and Reyan523 are suitable for that of 50%-25%.
General Switch-and-Stay Combing for Space Diversity over Rayleigh Fading Channels
Yawgeng A. Chau,Yao-Hua Chen
International Journal of Antennas and Propagation , 2012, DOI: 10.1155/2012/717494
Abstract: Three multibranch switch-and-stay combining (MSSC) schemes are analyzed for Rayleigh fading channels, where different decision statistics for antenna switching (i.e., switch statistic) are used. Let and denote the fading factor and the received baseband signal of a diversity branch, respectively. In contrast to the traditional MSSC that uses the faded signal-to-noise ratio (SNR) of diversity branches as the corresponding switch statistic, to enhance the receiver performance, ||, ||, and a new linear combination of a and || are used as switch statistics of the three MSSC schemes, respectively. For performance evaluation, the bit error rate (BER) of BPSK is derived for the three MSSC schemes over both independent-and-identical distributed (i.i.d.) and independent-and-nonidentical distributed (i.n.d.) Rayleigh fading channels. To pursue optimal performance, the locally optimal switch threshold (ST) of each MSSC scheme is obtained for general i.n.d. fading channels. In addition, the locally optimal ST becomes the globally optimal ST for i.i.d. channels. Numerical results based on the analysis and simulations are presented. In contrast to the MSSC over i.i.d. fading channels, we will show that the performance of MSSC schemes can be improved by increasing the number of branches, if i.n.d. channels are considered.


系统科学与数学 , 1986,
Abstract: For the bounded random variable the exponential rate of convergence of the condi-tional mean absolute error is obtained when the kernel estimate of the nonparametric re-gression function is applied.
Entropy exchange and entanglement in the multi-photon J-C model of a moving atom

Hu Yao-Hua,

物理学报 , 2012,
Abstract: Considering a moving two-level atom interacting with a single-mode thermal field through multi-photon process, in this paper we study the entropy exchange between the atom and the field by using quantum partial entropy and entanglement measured by using Concurrence, and investigate the effects of the initial atomic state, the atomic motion, the mean photon number and the transition photon number on entropy and entanglement. The results show that the entropy exchange and the entanglement exhibit the periodic evolution due to atomic motion, and entropy exchange occurs. The entanglement between the atom and the field is strengthened as the transition photon number increases. When the partial entropy exchange between atom and field is zero, the entanglement is also zero.
Effects of Shading on the Photosynthetic Characteristics and Chlorophyll Fluorescence Parameters of Carallia garciniaefolia

,WEI Li-ping,SUN Xiao-long,YUAN Hui-fang,TIAN Yao-hua

- , 2018, DOI: 10.13718/j.cnki.xdzk.2018.03.010
Abstract: 为研究大叶竹节树对弱光的适应性,通过盆栽实验,分析了不同程度(0%,25%,50%,75%)遮阴条件下大叶竹节树幼苗光合特性和荧光参数的变化.结果表明,随着遮阴程度增加,叶片净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、水分利用效率(WUE)和光合有效辐射(PAR)随之减小,而胞间CO2浓度(Ci)随之增大,说明非气孔制限因素是大叶竹节树光合速率下降的主要原因.各遮阴条件下叶片总叶绿素(a+b)、叶绿素a和叶绿素b质量比均显著高于全光照,且随遮阴程度的增加叶绿素质量比逐渐上升,而叶绿素a/b值则随着遮阴程度的增强而下降.叶绿素荧光参数PSⅡ原初光能转化效率(Fv/Fm)和潜在活性(Fv/Fo)的日变化呈单谷曲线;各遮阴条件下Fv/FmFv/Fo值均高于全光照,且与遮阴程度正相关,说明大叶竹节树是一种耐荫性很强的植物.在遮阴条件下,光补偿点、光饱和点、净光合速率、暗呼吸速率和叶绿素a/b值降低,而叶绿素a和b质量比、光能利用率、Fv/Fm以及Fv/Fo值提高,从而增强弱光条件下的生长能力.
To study the adaptability of Carallia garciniaefolia to low light conditions, the effects of different shading treatments (25%, 50% and 75% shading) on the photosynthetic characteristics and chlorophyll fluorescence of C. garciniaefolia seedlings were studied in a pot experiment. The results showed that net photosynthetic rate (Pn), stomatal conductivity (Gs), transpiration rate (Tr), water use efficiency (WUE) and photosynthetic active radiation (PAR) of the plant decreased, while its stomatal CO2 concentration (Ci) increased significantly with increasing shading, suggesting that non-stomatal limitation is the main cause of the reduction in photosynthesis rate of C. garciniaefolia. The contents of total chlorophyll (a+b), chlorophyll a and chlorophyll b in the leaves of the plants grown under different shading conditions were all significantly higher than under full day light, and increased with increasing shading, while chlorophyll a/b decreased. Fv/Fm and Fv/Fo in the shading treatments were
Quantum correlations between two non-interacting atoms under the influence of a thermal environment

Hu Yao-Hua,Wang Jun-Qiang,

中国物理 B , 2012,
Abstract: By considering a double Jaynes-Cummings model, we investigate the dynamics of quantum correlations, such as the quantum discord and the entanglement, for two atoms in their respective noisy environments, and study the effect of the purity and the cavity temperature on the quantum correlations. The results show that the entanglement suffers sudden death and revival, however the quantum discord can still reveal the quantum correlations between the two atoms in the region where the entanglement is zero. Moreover, when the temperature of each cavity is high the entanglement dies out in a short time, but the quantum discord still survives for quite a long time. It means that the quantum discord is more resistant to environmental disturbance than the entanglement at higher temperatures.
Page 1 /45931
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.