The investment circumstances and its classification appraisal of Changjiang river delta

This paper explains the meaning of investment circumstance, and analyses the overall feature of investment circumstances of the Changjiang River Delta zone and clears about its targets’ system. Then the authors use “polytarget comprehensive value evaluation rule” to make comprehensive classification appraisal of the investment circumstance of the five regions including Shanghai, Ning (Nanjing)-Zhen (Zhenjiang)-Yang(Yangzhou), Su(Suzhou)-Xi(Wuxi)-Chang(Changzhou)-Tong(Nantong), Hang(Hangzhou)-Jia(Jiaxing)-Hu(Huzhou), Ning(Ningbo)-Shao(Shaoxing)-Zhou(Zhoushan)etc., which have similar region feature and district join together due to the long-term development of society and economy among these regions.     

Re-Os (ICP-MS) dating of the massive sulfide ores from the Jinchuan Ni-Cu-PGE deposit

The Jinchuan Ni-Cu-PGE deposit is the largest nickel sulfide deposit in China and the third largest in the world[1]. It is also the largest platinum deposit in China and contains about 60% platinum reserve of China[2]. The Jinchuan intrusion covers only an area of 1.34 km2, but 47.8% of its volume is the orebody. That makes Jinchuan a typical “large ore deposit in a small intrusion”. A number of research works has been car-ried out towards the Jinchuan deposit. Different ore-forming mo…     

基于TM影像的抚州地区土地利用/覆盖动态监测及分析

以1988年和2000年遥感影像为数据源，在ERDAS IMAGINE遥感图像处理软件的支持下，获取了抚州地区两期土地利用／覆盖结果分类图。在此过程中确定了抚州地区土地利用／覆盖分类体系和遥感影像解译标志。通过计算机自动分类和分类后人工解译纠错相结合的图像分类提取方案，提高了图像分类提取的效率和精度。动态监测结果表明，从1988～2000年，面积减少的地类为耕地和林地，面积增加的地类为园地、居民点及工矿用地、水域和未利用土地，并对其变化结果进行了分析。     

Further Study on Geochemical Characteristics and Genesis of the Boninitic Rocks from Bikou Group, Northern Yangtze Plate

INTRODUCTIONCompositionally ,the term“boninite”refers to alarge variety of pri mary or near-pri mary ( Mg#=0 .60 -0 .85) magmas with a wide variation of CaO/Al2O3(most range from0 .55 to 0 .75) (Crawford etal .,1989) . With regard to its definition as recom-mended bythe I UGS (Deng et al .,1993) and Hickeyand Frey (1982) ,the classification of boninitic rocksis still a matter of petrological debate ( Qiu et al .,2004) .In general ,rock with some typical geochemi-cal features of bon…     

西藏冈底斯成矿带南缘喜马拉雅早期成矿作用——来自冲木达铜金矿床的Re-Os同位素年龄证据

采集冈底斯成矿带南部克鲁-冲木达铜金成矿亚带冲木达矽卡岩型铜金矿床的辉钼矿样品进行了Re-Os法精确同位素定年。该矿区辉钼矿的模式年龄介于37.63～41.19Ma之间,6件辉钼矿样品得到187Re-187Os等时线年龄为(40.3±5.6)Ma。该成矿年龄明显早于冈底斯成矿带中带和北带的驱龙、厅宫等斑岩铜矿床和甲马、知不拉、帮浦等矽卡岩型铜铅锌矿床的成矿年龄,而与冈底斯成矿带中广泛发育的碰撞期花岗质岩浆活动的年龄基本一致。据此认为,冲木达铜金矿床形成于喜马拉雅早期,与欧亚-印度大陆碰撞阶段的花岗质岩浆活动密切相关。     

瞬变电磁法在浑江盆地松树煤矿外围的应用

浑江煤田松树煤矿外围找煤项目主要是扩大煤炭储量,该区山高林密,地表条件差,地质构造复杂,侵入体多,形成高阻电性层。通过地面地质工作了解岩性变化规律,应用瞬变电磁法,工作便捷、观测精度高、不受高阻屏蔽。用其基础理论,进行数据处理。利用钻井电性地质资料对比,从已知到未知进行连续剖面解释,从定性、定量解释,确定火山岩的分布范围,划分煤系地层区段,提供建议孔位,从而完成地质任务,为后期工作提供物理信息。     

遗传算法优化的BP神经网络在地面温度多模式集成预报的应用研究

基于TIGGE资料集中的ECMWF、CMA和JMA的数值预报产品,利用加权集成、回归集成和消除偏差集成等线性集成方式与遗传算法优化的BP神经网络(GABP)集成,对我国大部开展地面2 m温度在24 h、48 h和72 h预报时效的多模式集成预报试验。通过对2013年1—6月的预报检验,结果表明:GABP集成预报效果有较大提升,均方误差明显小于各单一模式预报。GABP集成的误差分布在新疆和华北均方误差较大,但是在预报效果改进上GABP集成在西部地区相对单一模式的误差减小更加明显。在进行几种多模式集成方式时,GABP集成相比线性方法预报结果更加精准。对于天气过程个例的预报,GABP集成预报出预报量的变化趋势,预报效果优于单一模式和线性集成预报。无论是较长时间段还是短时间的天气过程,在改进预报效果上GABP集成都起到了最佳的作用。     

中部太平洋大眼金枪鱼种群遗传结构的初步研究

大眼金枪鱼是世界最重要的渔业资源之一,经济价值较高,捕捞压力的加大使中部太平洋大眼金枪鱼过度捕捞程度愈发严重。开展种群遗传结构研究将为大眼金枪鱼资源的可持续利用与开发提供科学依据。本文以取自中西太平洋和中东太平洋共182尾大眼金枪鱼个体为研究对象,分析研究其线粒体DNA控制区第一个高变区（the first hypervariable region,HVR-1）457bp的序列,共发现115个变异位点,定义了178种单倍型。序列多样性分析结果显示8个采样点核苷酸多样性在0.03074-0.04362间,单倍型多样性在各个采样点都较高,变动范围在0.996-1.000之间;分子方差分析显示99.97%的遗传变异性来自于种群内;群体间的高基因交流值Nm和低分化指数Fst揭示中东太平洋与中西太平洋群体间基因交流频繁,不存在显著的遗传分化。     

Trophic ecology of sharks in the mid-east Pacific ocean inferred from stable isotopes

As apex predators, sharks are of ecological and conservation importance in marine ecosystems. In this study, trophic positions of sharks were estimated using stable isotope ratios of carbon and nitrogen for five representative species caught by the Chinese longline fleet in the mid-east Pacific, i.e., the blue shark(Prionace glauca), the bigeye thresher shark(Alopias superciliosus), the silky shark(Carcharhinus falciformis), the scalloped hammerhead(Sphyrna lewini), and the oceanic whitetip shark(Carcharhinus longimanus). Of these species, oceanic whitetip shark has the lowest trophic level and mean δ15N value(3.9 and 14.93‰± 0.84‰), whereas bigeye thresher shark has the highest level/values(4.5 and 17.02‰± 1.21‰, respectively). The bigeye thresher shark has significantly higher δ15N value than other shark species, indicating its higher trophic position. The blue shark and oceanic whitetip shark has significantly higher δ13C values than bigeye thresher shark, silky shark and scalloped hammerhead, possibly due to different diets and/or living habitats. The stable isotope data and stomach content data are highly consistent, suggesting that stable isotope analysis supplements traditional feeding ecology study of sharks, and thus contributes to understanding their trophic linkage.