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Search Results: 1 - 10 of 62270 matches for " XU Bai-Qi "
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Relationship between landscape pattern and environmental factors in Jiaodong mountain region -The case of Qixia City in Shandong Province

SONG Ping,QI Wei,XU Bai-Qi,LI Zhe,LU Chao,ZHANG Sheng-Wu,
宋 萍
,齐 伟,徐柏琪,李 哲,路 超,张圣武

中国生态农业学报 , 2013,
Abstract: To determine the distribution characteristics of landscape patterns in mountain regions, the case of Qixia City was investigated and a geological database built for grid datum using the 2003/2010 land use/landscape pattern map, DEM map, soil map, etc. of Qixia City. These data were processed in ARCGIS and CANOCO environments on Windows 4.5 platform. CCA (canonical correlation analysis) ranking method was used in the study to comparatively analyze changes in landscape pattern and environmental factors in different years in Qixia City. The results showed that percent cumulative variances of landscape-environment relation were respectively 98.8% and 98.7% in 2003 and 2010, indicating a decreasing trend. However, correlation analysis between landscape and environment showed a higher coefficient for 2003 than for 2010. Meanwhile total eigen-values of the ordination axes were 0.572 and 0.808, respectively. Different environmental factors had different impacts on landscape pattern with time. There was little change in land use/landscape pattern between 2003 and 2010. In addition, the other six land use types were not obviously different, except for unused land. There were similar regularities in the relationship between landscape pattern and environmental factors for 2003 and 2010. The main factors with major impact on landscape were sunshine hours, slope gradient and altitude. Water surface and build-up land were in areas with higher sunshine hours, lower altitudes and gentler slopes. However, unused land and grassland were mainly in the other areas. Through land use/landscape pattern and environmental factor relationship, this paper determined land use/landscape pattern distribution characteristics in Qixia City. This study therefore provided theoretical basis for adjustments in agricultural land structure and in the general land use structure for optimized land use in the study area and beyond.
Damaging Effects of Nanosized TiO2 on Bel-7402 Human Liver Cancer Cell Under Photoinduce
纳米TiO2光诱导杀伤 Bel-7402人体肝癌细胞研究

XIA Chun-Hui,WANG Bai-Qi,WANG Yu,LIU Ya-Qin,XU Guang-You,WU Shan,

无机材料学报 , 2006,
Abstract: The damaging effects of nanosized TiO_2 on human Bel-7402 liver cancer cell were investigated by means of HE dye method and MTT colorimetric assay under condition of photoin- duce.The influences of nanosized TiO_2 content,and irradiation time on cancer inhibition were systematically studied,and the inhibition mechanism was primarily discussed.The results show that nanosized TiO_2 exhibits good inhibition effects under appropriate TiO_2 concentration,and the inhibition process obeys first order reaction rule approximately;In addition,activity oxygen produced by nanosized TiO_2 under illumination can react with organicmolecules in and out the cancer cell membrane,so that lead to damage cell structure,result into imbalance of Ca~(2+) in the cancer cell,and induce microtubule reassembly due to expression changes of microtubule-associated protein-2,which are responsible for the apoptotic and dead cancer cells.
$R$ Matrix for $U_{q}E_{7}$
Jin Bai-Qi,Ma Zhong-Qi
Physics , 1994,
Abstract: The quantum Clebsch-Gordan coefficients and the explicit form of the $\breve{R}_{q}$ matrix related with the minimal representation of the quantum enveloping algebra $U_{q}E_{7}$ are calculated in this paper.
$L^{\pm}$ Operators and Quantum Enveloping Algebras
Mi Xie,Bai-Qi Jin,Zhong-Qi Ma
Mathematics , 1995,
Abstract: The relations between $L^{\pm}$ operators and the generators in the quantum enveloping algebras are studied. The $L^{\pm}$ operators for $U_{q}A_{N}$ and $U_{q}G_{2}$ algebras are explicitly expressed by the generators as examples.


系统科学与数学 , 1993,
Abstract: In this paper,the estimates and tests of the change point in a linear regression model arediscussed with Wilcoxon rank sum statistic when observations are large enough.Furthermore,the testing procedure on line is presented.Besides,a method for testing the change point is pro-posed with different observations before and after the change point.
Vertex Operator of $U_q(\widehat{B_l})$ for Level One
Bai-Qi Jin,Shan-You Zhou
Mathematics , 1995,
Abstract: In this paper,we give the explicit formulae of vertex operators of ${U_q}(\widehat{B}_l)$ for level-one as operators on the Fock space. Meanwhile, we point out that the free field realization (by one fermionic field and $l$ bosonic fields) of highest weight module with highest weight $\Lambda_l$ has two irreducible modules.
Analysis of chaotic properties and nonlinear prediction of ionospheric total electron content over 120°E magnetism equator

KE Xuan,WAN Wei-Xing,NING Bai-Qi,

地球物理学报 , 2006,
Abstract: 本文利用120°E磁赤道上空电离层TEC1996~2004年的观测数据讨论电离层TEC参量的混沌特性,并探讨利用混沌理论对电离层参量进行预报的可能性.实际计算表明,在指定经纬度的TEC时序数据中存在混沌特性,其关联维数为3.6092,李雅普诺夫指数为0.3369.采用混沌"加权一阶局域法"进行预测较为成功.对预测误差分析表明,预测点在1~144之间误差相对较小,标准差约为7.6438 TECU,相关系数约为0.9172.
A comparison and analysis of the S4 index,C/N and ROTI over Sanya

XIONG Bo,WAN Wei-Xing,NING Bai-Qi,YUAN Hong,LI Guo-Zhu,

地球物理学报 , 2007,
Abstract: Using the data received by GPS scintillation/TEC receiver at Sanya station in Hainan province during August,2004-July,2005,we made some comparison and analyses of the S_4(the amplitude scintillation index),C/N(Carrier to Noise) and ROTI(the standard deviation of the change rate of TEC).We also analyzed the scintillation on 7 November 2004 in detail.From the comparison and analysis,we concluded as follows:(1) the scintillation strength of one year has a semiyearly periods,the maximum scintillation strength of one year appears in spring and autumn;(2) the S_4 and C/N have a good negative correlation;(3) ROTI can be regarded as an indicator of the present of scintillation causing small-scale ionospheric irregularities.
GPS observations of TID events generated by the moving solar terminator

WANG Min,DING Feng,WAN Wei-Xing,NING Bai-Qi,CHEN Yi-Ding,

地球物理学报 , 2009,
Abstract: 本文选取由国际GPS服务中心(IGS)提供的北美中纬度地区GPS网TEC观测数据,通过多通道最大熵频谱分析方法研究了2005年(太阳活动低年)地磁活动平静期间日出和日落时由于日夜交替线的移动而激发的中尺度电离层扰动(MSTID),并统计分析其季节变化特性.结果表明:(1)日出或日落期间,在中纬度地区经常观测到由日夜交替线移动激发的中尺度电离层扰动.扰动主要沿日夜交替线运动方向传播,平均持续时间约2~3 h;振幅在0.2~0.8 TECU之间,水平波长,水平相速度和周期分别为300±150 km,150±80 m/s和25±15 min;(2)由日夜交替线移动激发的中尺度电离层扰动在春秋分出现率较少;在夏季,扰动在黄昏时出现率达最大值,在日出后少量出现;而冬季则日出后的扰动效应更为明显.分析表明,在中纬地区,这种扰动出现率随季节的变化与不同季节的日出日落时刻太阳EUV辐射通量变化过程的快慢,以及电离层中离子损失过程快慢有关.
Risk Analysis of Portfolio by Copula-GARCH
基于Copula2GARCH 的投资组合风险分析

WU Zhen-xiang,CHEN Min,YE Wu-yi,MIAO Bai-qi,
,陈 敏,叶五一,缪柏其

系统工程理论与实践 , 2006,
Abstract: Copula can describe the dependency structure of multi dimension random variable.In this paper,Copula and the forecast function of GARCH model are well combined,and a Copula Garch model is built for risk analysis of portfolio investment.By this model,empirical portfolio risk analysis is made in Chinese stock market.At last,the mini risk portfolio is given.
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