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891.
我国西南地区夏季降水异常与太平洋海温季节演变的关系   总被引:2,自引:0,他引:2  
根据太平洋(10°S-50°N,120°E-80°W)286个网格点1951-1986年逐月平均海温资料和同期西南地区34个站月平均降水资料1),利用交叉相关场EOF分解考察我国西南地区夏季降水与太平洋海温遥相关的结构;然后通过聚类对西南地区夏季降水分成两种基本型,分别对两种降水型对应的各季海温进行距平和复自然正交(CEOF)的合成分析。结果表明:太平洋中高纬地区和赤道东太平洋海温与我国西南四川、贵州等地存在明显的季节变化遥相关;两种降水型对应的海温异常分布,无论是距平结构还是振荡传播,均有明显的两类相反特征。  相似文献   
892.
INTRODUCTIONWith the development of economy and the exploitation of coastal resources, the coastal en-vironment of the northern part of China was seriously damaged, especially in the Jiaozhou Bay.More attention was paid to this phenomenon. Five comprehensive investigations on theecological dynamics of the Jiaozhou Bay were carried out from March to November of 1995. Theaim is to study the annual variation characteristics of the ecosystem dynamics of the Jiaozhou Bay.Yu Guangyao et al.…  相似文献   
893.
皱纹盘鲍经诱导后血淋巴中一些因子变化的研究   总被引:41,自引:2,他引:41  
于1995年11月在山东荣城大鱼岛鲍养养殖厂采集皱纹盘鲍,以大肠杆菌,弧菌为诱导物,将鲍分为三组分别进行注射,在注射后的5,18,32,50h分别取鲍血淋巴,测定其抗菌,溶菌,酚氧化酶和超氧化物歧化酶活力,并研究注射组各项活力的变化规律。实验结果表明,适当的刺激可增加皱纹盘鲍的抗病能力。  相似文献   
894.
N-MORB-type metabasites are discovered in the Guoganjianian area, central Qiangtang, Tibet, which are mainly metagabbro with cumulate structure and metabasalt. The rocks are distributed nearly from west to east unconformably underlying the Wanghuling Group of upper Triassic. On the basis of geo- chemical analysis, we find that the content of SiO2 is 43.03%―53.42%, and TiO2 1%―2.67%, Al2O3 16.75%―21.52%, CaO 7.03%―11.13%, K2O 0.05%―0.38%; the REE pattern is slight depletion or flat, and the trace spider diagram is like that of N-MORB, so we consider that the metabasite was formed under the setting of mid-ocean ridge or adult back-arc basin, and it is the fragment of Paleo-Tethys ophiolite.  相似文献   
895.
A modified version of the NCAR/RegCM2 has been developed at the National Climate Center (NCC), China Meteorological Administration, through a series of sensitivity experiments and multi-year simulations and hindcasts, with a special emphasis on the adequate choice of physical parameterization schemes suitable for the East Asian monsoon climate. This regional climate model is nested with the NCC/IAP (Institute of Atmospheric Physics) T63 coupled GCM to make an experimental seasonal prediction for China and East Asia. The four-year (2001 to 2004) prediction results are encouraging. This paper is the first part of a two-part paper, and it mainly describes the sensitivity study of the physical process paraxneterization represented in the model. The systematic errors produced by the different physical parameterization schemes such as the land surface processes, convective precipitation, cloud-radiation transfer process, boundary layer process and large-scale terrain features have been identified based on multi-year and extreme flooding event simulations. A number of comparative experiments has shown that the mass flux scheme (MFS) and Betts-Miller scheme (BM) for convective precipitation, the LPMI (land surface process model I) and LPMII (land surface process model Ⅱ) for the land surface process, the CCM3 radiation transfer scheme for cloud-radiation transfer processes, the TKE (turbulent kinetic energy) scheme for the boundary layer processes and the topography treatment schemes for the Tibetan Plateau are suitable for simulations and prediction of the East Asia monsoon climate in rainy seasons. Based on the above sensitivity study, a modified version of the RegCM2 (RegCM_NCC) has been set up for climate simulations and seasonal predictions.  相似文献   
896.
As located in the junction of three tectonic plates (the Eurasian plate, the Indian plate and the west Pacific plate), the China continent shows complex regional metallogenic features due to tectonic evolution of “micro-plates, polycycle tectonic movements”. Well developed superimposed metailogenic systems have constituted one of the regional metallogenic features in China. Through the study on superimposed metailogenic system of the middle and lower reaches of the Yangtze River and of the Yuebei basin (northern Guangdong Province), the authors put forward some basic combination pattern of sedimentary-magmatic superimposed metailogenic system and summarize its forming conditions (controlling factors).  相似文献   
897.
We present spectroscopic CCD observations of R Canis Majoris obtained in 1993. A total of 19 plates for Hα line were secured and reduced with the IRAF for radial velocities. A new radial velocity curve has been analyzed with collected light curves by the method of the Wilson and Devinney Differential Correction. The solution set including mass ratio q = 0.17 is determined as a unique solution by cross checking simultaneous adjustment of radial velocity and light curves, mass-luminosity relation, and distance. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
898.
地图数字化数据的平差处理   总被引:4,自引:0,他引:4  
地图数字化是获取 GIS空间数据的主要手段之一。针对地图数字化过程中对直角型和直线型地物的数据采集误差的平差处理 ,建立了条件方程 ,并讨论了衡量地图数字化质量的精度标准  相似文献   
899.
中国三条高温高压变质带及其地质意义   总被引:3,自引:1,他引:2  
翟明国 《岩石学报》1998,14(4):419-429
高温高压变质岩是指高温(热)榴辉岩-高压麻粒岩-石榴角闪岩的变质序列。其形成的大地构造环境为陆-陆碰撞或陆-弧碰撞带,而不形成于与洋壳有关的汇聚性板块边缘。中国境内有三条典型的高温高压变质带,它们是桑干-承德变质带,大别山-苏鲁变质带和南迦巴瓦变质带。变质时代分别是2500Ma,210~240Ma和17~14Ma。大别山-苏鲁变质带是中生代陆-陆碰撞带根部变质杂岩,代表了华北与扬子两个陆块拼合的界限。年轻的南迦巴瓦变质带是陆-弧碰撞带变质岩系,高压麻粒岩除了在冈第斯岩浆弧的根部以透镜体出露外,主要代表了被掀斜抬升的印度陆块的基底下地壳岩石。桑干-承德变质带是华北克拉通内的高压麻粒岩-榴辉岩转换相的变质带,表明在晚太古代已有与显生宙相似的形成高压变质带的大地构造机制。  相似文献   
900.
The historical earthquake data is one of the important foundations for seismic monitoring, earthquake fore-cast and seismic safety evaluation. However, the recognition of earthquake is limited by the scientific and techno-logical level. Therefore, the earthquake can only be described using perfect earthquake catalogue after the seismo-graph is invented. Before this time, the earthquake parameters were determined according to the earthquake disas-ter on the surface and the written records in history, and the earthquake level was measured using earthquake in-tensity.  相似文献   
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