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Search Results: 1 - 10 of 403869 matches for " <br>周旭华 "
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STUDY ON UPPER LAYER GEOSTROPHIC CIRCULATION IN CHINA MARGINAL SEA BY USE OF DATA OF SATELLITE GRAVITY AND SATELLITE ALTIMETRY
联合卫星重力和卫星测高数据研究中国近海上层地转流

Zhou Xuhua,Wang Hubiao,Zhan Jingang,<br>,王虎彪,詹金刚
大地测量与地球动力学 , 2008,
Abstract: The multi-year mean upper layer geostrophic circulation in China coastal waters and the seasonal circulation in south China sea are studied by using the sea level anomaly based on satellite altimetry technique associated with the stable sea surface topography from the satellite gravity data.The research results show the clear Kuroshio effects on the circulation in China coastal waters,and the circulation in South China Sea is predominated by seasonal variation,in winter the whole circulation appears to be cyclone consisted of two sub-basin cyclonic gyres in the south and north respectively,in summer the circulation is whole anti-cyclonic.Through the comparison of the calculated geostrophic circulation with the satellite tracking surface drifting buoy,it is found that the calculated result is in good agreement with surface observation.
PATTERN RECOGNITION BASED ON WAVELET MOMENT INVARIANTS
基于小波矩不变量的模式识别方法

XU Xu-Dong,ZHOU Yuan-Hua,<br>徐,
红外与毫米波学报 , 2000,
Abstract: 为了得到一组局产最优的特征组,提出一种结合分散度和顺序前进法(SFS)的特征选择方法。实验结果表明小液矩不变量比Zernike矩不变量有更好的识别效果,尤其对于形体相似的物体,效果更明显。
Microwave Response of Electrode Transmission Line of GaAlAs/GaAs Quantum Wells Traveling-Wave Optical Modulator
GaAlAs/GaAs量子阱行波Mach-Zehnder光调制器电极传输线的微波响应

Zhou Jianying,Li Xihua,Zhou Xiaoping,Chen Kejian,Zhao Xu,Wang Minghua,<br>剑英,李锡,小平,陈克坚,,王明
半导体学报 , 2003,
Abstract: 研制了利用直线法设计的基于Ga As衬底上的Mach- Zehnder行波光调制器.波导层使用了场诱折射率改变量较大的非对称多量子阱结构,采用脊型波导,并湿法刻蚀出台面以消除波导区以外的载流子引起的损耗.调制器电极微波特性测试结果表明频率响应在2 .5~2 0 GHz没有明显的起伏,但在低频段响应下降很快,另外微波损耗较大,讨论了其原因和改进方法.
THE PROCESSING OF AMBIGUOUS PHRASES IN REFERENTIAL DISCOURSE CONTEXT IN CHINESE
话语参照语境条件下汉语歧义短语的加工

Zhang Yaxu,Shu Hua,Zhang Houcan,Zhou Xiaolin,<br>张亚,,张厚粲,晓林
心理学报 , 2002,
Abstract: In Chinese language, there are some phrases, which are orderly composed of one verb (VP), one noun (N1), one auxiliary, and another noun (N2). They are temporarily ambiguous between modifier-noun construction (MNC) and narrative-object structure (NOS). Some of them are balanced between MNC and NOS (named Balanced Phrases). The others bias towards either MNC (named MNC-biased Phrases) or NOS (named NOS-biased Phrases). Both balanced and NOS-biased phrases were used to investigate the mechanisms underlying the effect of referential discourse context on the parsing of these ambiguous phrases. Twenty undergraduate students participated in Experiment 1, they were asked to read short passages word-by-word as quickly as possible, without sacrificing their comprehension of each passage. Another sixteen undergraduate students participated in Experiment 2, where their eye movements were recorded when they read the same passages. It was found that the referential discourse context, in both experiments, had its influenced on the parsing of the ambiguous phrases even at the very beginning of these phrases. These results indicate that the specific mechanism that drives the contextual influence may not be attributable solely to referential presuppositions. In other words, informational or conceptual expectations can be, at least partly, responsible for the referential contextual effects observed. In addition, very early influence of discourse context was found in Experiment 2, which was not predicted by garden-path models that suppose initial parsing decision is context-independent.
LONG-TERM COMPARATIVE STUDY OF THE HYDROLOGICAL CHARACTERISTICS OF FORESTS IN DIFFERENT SUCCESSIONAL STAGES IN THE DINGHUSHAN BIOSPHERE RESERVE, GUANGDONG PROVINCE, CHINA
鼎湖山地带性植被及其不同演替阶段水文学过程长期对比研究

ZHOU Chuan-Yan,ZHOU Guo-Yi,YAN Jun-hua,WANG Xu,<br>传艳,国逸,闫俊,
植物生态学报 , 2005,
Abstract: 分析鼎湖山3种植被类型生态系统水文的长期连续观测资料,采用时空互代的方法,得到如下一些结果:1)鼎湖山自然保护区东沟集水区产水量达到降水量的66.5%,日径流量高峰的出现相对降水的发生滞后1 d左右.2)地下水位平均稳定在2.22 m,最低为2.84m,最高为1.14 m.1999、2000、2001、2002和2003年地下水位平均值分别为2.38,2.27,2.08,2.13和2.11m.鼎湖山东沟集水区每日地下水位与前16 d每一天的降水量相关.3)随着时间推移3种不同的植物群落中土壤含水量都有减少的趋势.季风林(p<0.01)和混交林(P<0.05)的土壤含水量减少趋势具有统计上的显著性,松林除外.4)鼎湖山3个处于不同演替阶段的植物群落其穿透水量与大气降水皆呈线性相关,它们的R2值随演替的进展而减小.穿透水占大气降水的比例也随演替进展而减少,松林、混交林和季风林分别为83.4%、68.3%和59.9%.松林、混交林和季风林的树干茎流占大气降水的比例分别为1.9%、6.5%和8.3%.树干茎流和胸径的关系受控于整个群落整体的影响而不仅仅是某个单一物种,并且群落的郁闭程度和结构是影响降水在林内再次分配的关键因素.季风林2月大气降水28.7 mm林冠截流率为83.3%,而在大气降水为297.8 mm的6月林冠截留率仅为18.9%,并且随着植物群落的演替,从松林、混交林到季风林的过程中林冠截留逐渐增大.
利用GPS连续观测进行中国沿海验潮站地壳垂直形变分析
Analysis of the Vertical Deformation of China Coastal Tide Stations Using GPS Continuous Observations

, 兴华, 张化疑, 王朝阳, 唐秋<br>ZHOU Dongxu, ZHOU Xinghua, ZHANG Huayi, WANG Zhaoyang, TANG Qiuhua
- , 2016, DOI: 10.13203/j.whugis20140714
Abstract: 利用中国沿海GNSS(Global Navigation Satellite System)业务化观测系统2009~2013年的GPS连续观测数据,在统一基准下分析了中国沿海22个长期验潮站的地壳垂直形变。分析结果表明,各验潮站高程时间序列的周期变化与潮汐变化具有较高的关联性;22个验潮站的地壳垂直形变趋势既具有小区域一致性,又存在显著的海区差异;研究验潮站地壳垂直形变,可以有效消除验潮站地壳形变对区域海平面变化的影响,实现海平面变化量的准确提取
ENGINEERING PROPERTIES OF SURROUNDING ROCKS OF MOGAO GROTTOES AT DUNHUANG
敦煌莫高窟洞窟围岩的工程特性

Wang Xudong,Zhang Mingquan,Zhang Huyuan,Zeng Zhengzhong,Yao Zeng,Zhou Zhonghua,<br>王,张明泉,张虎元,曾正中,姚增,
岩石力学与工程学报 , 2000,
Abstract: The cave strata at Mogao grottoes are divided into four engineering geological groups and their physical and mechanical properties are tested. The feature of structure surface of surrounding rocks of the caves are also investigated and tested with elastic wave. The result indicates that the cave strata are of the engineering properties so that the strata could be dug by hand work and their stability kept by themselves.
OPTIMAL DESIGN OF ORBITAL ALTITUDE IN SATELLITE-TO-SATELLITE TRACKING MODEL
卫-卫跟踪测量模式中轨道高度的优化选取

Zheng Wei,Xu Houze,Zhong Min,Yun Meijuan,Zhou Xuhua,Peng Bibo,<br>郑伟,许厚泽,钟敏,员美娟,,彭碧波
大地测量与地球动力学 , 2009,
Abstract: The GRACE Earth's gravitational field complete up to degree and order 120 is recovered based on different orbital altitude according to the improved energy conservation principle.The simulative results show: Firstly,with the decrease of orbital altitude per 100 km,atmospheric drag will increase 10 times approximately,and the unstable work environment of satellite platform will influence the measuring accuracy of GRACE key payloads.Secondly,the high-frequency signals of Earth's gravitational field will be at...
PROGRESS AND PRESENT STATUS OF RESEARCH ON EARTH''S GRAVITATIONAL FIELD MODELS
地球重力场模型研究进展和现状

Zheng Wei,Xu Houze,Zhong Min,Yun Meijuan,Peng Bibo,Zhou Xuhua,<br>郑伟,许厚泽,钟敏,员美娟,彭碧波,
大地测量与地球动力学 , 2010,
Abstract: 首先回顾自1966年以来国内外基于传统重力测量技术建立的地球重力场模型。其次,介绍国际基于CHAMP实测数据建立的全球重力场模型。在重力场长波部分, EIGEN-CHAMP03S和EIGEN-3P模型符合较好;在中长波部分,EIGEN-1S、EIGEN-2、EIGEN-3P和EIGEN-CHAMP03S模型的符合性趋于一致。最后,介绍国内外已公布的GRACE卫星重力模型。由于GGM02S和WHIGG-GEGM01S模型采用的卫星观测值数量近似相等,因此二者精度符合较好;由于采用CHAMP、GRACE、卫星测高和地面重力的联合观测数据,EIGEN-CG01C、EIGEN-CG03C、EIGEN-GL04S1和EIGEN-5C模型精度均分别高于EIGEN-GRACE01S、EIGEN-GRACE02S、GGM01S、GGM02S、WHIGG-GEGM01S等GRACE-only模型。
DEMONSTRATED STUDY ON INFLUENCES OF INTERSATELLITE RANGE ON ACCURACY OF GRACE EARTH''S GRAVITATIONAL FIELD
星间距离影响GRACE地球重力场精度研究

Zheng Wei,Xu Houze,Zhong Min,Yun Meijuan,Zhou Xuhua,<br>郑伟,许厚泽,钟敏,员美娟,
大地测量与地球动力学 , 2011,
Abstract: 利用改进的能量守恒法,基于不同星间距离反演了120阶GRACE地球重力场。模拟结果表明:第一,基于相同的GRACE核心载荷精度指标反演长波(L≤20阶)地球重力场时,随着星间距离逐渐增大(110 ~ 330 km),累计大地水准面的精度依次提高。在20阶处,基于110 km星间距离反演精度为0.052 cm,基于220 km和330 km星间距离反演精度分别提高了1.156倍和1.209倍。第二,当反演中波(100≤L≤120阶)地球重力场时,在120阶处,基于110 km星间距离反演精度为13.052 cm,基于220 km和330 km星间距离反演精度分别降低了1.327倍和1.970倍。第三,星间距离设计为220±50 km可有效抑制由于星间距离选取不当而导致的长波和中波地球重力场精度的降低。
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