浙江沿海中合新世古气候,古环境初步分析

首次通过对浙江象山爵溪镇下沙、大岙和岱山大长涂岛小沙河３个中全新世海滩岩剖面进行以动物群分析为基础，应用δ＾１８Ｏ和＾１４Ｃ等手段相结合的综合研究，初步分析了浙江沿海中全新世的古气候、古环境。     

激光象山爵溪镇下沙中全新世海滩岩中热带贝类初步研究

本文本文报道了浙江象山县爵溪镇下沙中全新世海滩岩中的部分热带贝类，计有８属９种。这一动物群的现生物均生活于热带海域的潮间带及潮下带，研究结果表明该区海滩岩是迄今发现的拥大量热带生物的最北面的海滩岩，进一步证实了海滩岩是热带海洋的产物。以及浙江浙江沿海地区中全新世的时的气候与现代气候有很大差别，这对古气候变迁的研究具有重要意义。     

浙江象山爵溪镇下沙中全新世海滩岩中热带贝类初步研究

本文报道了浙江省象山县爵溪镇下沙中全新世海滩岩中的部分热带贝类，计有８属９种。这一动物群的现生种均生活于热带海域的潮间带及潮下带。研究结果表明该区海滩岩是迄今发现的拥有大量热带生物的最北面的海滩岩，进一步证实了海滩岩是热带海洋的产物，以及浙江沿海地区中全新世时的气候与现代气候有很大差别，这对古气候变迁的研究具有重要意义。     

全新世大暖期气候环境特征及其机制的再认识

综合论述了全新世大暖期环境的主要特征：降水量增加，气温上升，植被带北移西迁；肯定了大暖期中存在的低温干旱事件，大暖期也不是持续稳定的温暖湿润期．根据太阳“C丰度与中国西部祁连山敦德冰芯δ^18O、德国南部Ammersee深海平原δ^18O的对比，显示全新世气候的变化可能同太阳活动有密切关系；用REDFIT35对大气剩余^14C与EIK湖泊沉积记录作频率对比分析显示，试图证明在9～3ka B．P．期间气候变化存在千年尺度周期波动的可能性．     

浙江中全新世古气候古环境变化与河姆渡古人类

初步讨论了浙江东部中全新世古气候古环境变化及其对河姆渡古人类发展的影响,研究结果表明,中全新世大暖期是促使河姆渡古人类定居、发展和稻作农业在本区出现发展的重要条件,古气候古环境不同变化阶段与河姆渡古人类的发展阶段可以相互对比,而当时近于热带的古气候古环境变化,包括其导致的自然灾害的加强,对河发渡古人类的生产,生活面貌的变化和发展有深刻影响,特别是缓慢降温后紧接着急剧升温的变化过程是引起人类发展面貌     

甘肃天水全新世黄土粒度、磁化率特征及其古气候意义

结合光释光测年和文化遗迹的断代技术,在系统测试甘肃天水师家崖黄土-古土壤剖面的磁化率和粒度基础上,分析天水黄土-古土壤的沉积学特征和成壤演化特征,揭示天水地区全新世以来的气候变化规律.结果表明:师家崖剖面是典型的风成堆积的黄土剖面,全新世剖面中粒度组成主要以粗粉砂(16～63μm)和细粉砂(2～16μm)为主,平均质量分数分别为54.9%、20.3%,其次为黏粒和砂粒;粒度参数显示,粒度组成较均一,分选性较好,峰态呈中等,偏度属正偏型.黏粒、细粉砂、黏粒/粗粉砂和磁化率在古土壤层出现高值,在黄土层为低值;而粗粉砂变化趋势相反.天水地区全新世时期气候变化可以分为3个阶段:全新世早期(11 500～8 500 aBP)气候温凉;全新世中期(8 500～3 100 aBP),气候总体上温暖湿润,但并不持续稳定,其中7 000～6 000 aBP出现气候波动;全新世晚期(3 100 aBP以来),气候又进入一个相对温凉少雨的时期.     

海南岛西北部晚更新世海滩岩地球化学特征及其古环境意义

对海南岛西北部儋州市排浦地区晚更新世海滩岩的岩石学、地球化学特征进行了研究，结果表明：海滩岩主量元素与上部陆壳(UCC)的平均含量比较，显著富集MgO和CaO，略富集MnO，其他均亏损，其中Na2O亏损最大。6件海滩岩REE总体呈微弱的右倾轻稀土富集型曲线，轻、重稀土分异不强，以Eu弱负异常，Ce弱负异常及La弱正异常为特征；从早到晚，Al2O3 /MgO 比值变小和陆源碎屑组分SiO2、Al2O3、Na2O、K2O、TiO2等含量逐渐下降共同反映陆源的化学风化减弱，气候越来越干旱。古盐度Z值、Sr/Ba、Rb/K、V/Cr、V/(V+Ni)和稀土元素判别研究区为弱氧化-氧化的海陆交互环境，古地理格局为半封闭边缘海。 根据δ18O计算出的晚更新世古水温平均温度为28.22℃，与前人用浮游有孔虫壳体 Mg/Ca比值计算出的古海水温度相吻合，显示为热带海洋环境，海滩岩具有记录古环境的意义。     

轮古西地区奥陶系碳酸盐岩古岩溶储层碳、氧同位素地球化学特征

中—下奥陶统鹰山组碳酸盐岩古岩溶储层是塔里木盆地轮古西地区的主要油气产层 .为了弄清储层的成因类型、储层古岩溶过程中的流体性质和古水文条件 ,为预测和评价此类储层提供有关的地球化学信息 ,讨论了储层形成过程中记录的碳、氧稳定同位素特征 .结果表明 :轮古西地区奥陶系鹰山组碳酸盐岩古岩溶储层中的δ13C和δ18O值的变化范围较大 ,δ13C值为 -0 .70‰～ -6.5 0‰ ,平均值 -1 .76‰ ;δ18O值为 -3 .75‰～ -1 7.1 0‰ ,平均值 -9.42‰ .碳酸盐岩基质、冲积岩和方解石胶结物的δ13C和δ18O分布具有一定的差异 .三类样品的δ18O值均具有明显偏负特征 ,表明在碳酸盐岩成岩过程中受到大气成因的淡水影响 ,反映了当时的风化壳岩溶成岩环境 .冲积岩样品的δ13C值的偏负程度较高 ,其物源可能来自石炭—二叠系地层     

南京江北地区全新世环境演变的沉积学研究

通过区域地貌调查及对南京浦镇林峰桥剖面沉积物进行粒度、地球化学和稳定碳同位素等环境替代指标的分析研究 ,结果表明 :本区在 140 0 0aBP左右先后经历了沼泽扩张期 ,此后气候变干 ,沼泽开始退缩 ,直至消失 ,在经过了长时间的沉积间断后又经历一次洪水泛滥期 .经过新仙女木期(10 2 0 0～ 10 80 0aBP)的寒冷期后进入了全新世的增温期 .后又经历多次冷暖波动 ,在 756 2± 90aBP～ 380 0aBP全新世最适宜期增温事件后 ,受 14～ 19世纪小冰期气候的影响 ,气候又开始向冷干转变 .同时在研究中还发现 ,古洪水多发生在气候转型期 ,因此笔者提出古洪水的发生可能与全球气候变迁历史中的突变事件有某种必然的联系 .     

河南洛阳寺河南剖面中全新世以来的孢粉分析及环境变化

对河南洛阳寺河南剖面进行的高分辨率的孢粉分析表明,该地区中全新世以来的孢粉组合以草本植物占绝对优势。其中以蒿属(Artemisia)最为丰富,其次为禾本科(Gramineae)和藜科(Chinopodiaceae)。乔木花粉含量较少,以松属(Pinus)为主。根据孢粉组合的变化,将剖面划分为5个孢粉组合带。早期(7235—7380aBP)气候较为寒冷干燥,缺少乔木花粉。随着全新世大暖期的到来,在Ⅱ孢粉带上乔木花粉大量出现,种类丰富。尤其5625-6120aBP期间出现了很多喜暖树种,是中全新世以来气候最好的时期。在4580—5625aBP期间,乔木花粉急剧减少,表明气候发生恶化。随着气候的逐渐好转,乔木花粉在Ⅳ孢粉带(3090-4580aBP)上重新出现,但喜暖树种较少。3090aBP以后出现较多的禾本科花粉,可能和该地区人类活动的增强相关。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

Features of Women''s language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

英文诗歌中的喻类修辞

为了有助于提高英文爱好者的个人情操、文化素养和学习兴趣,以及专业人员对英语学习和研究进行多途径的探索,本文通过一些精选诗歌的引证和分析,着重论述了喻类修辞法在英文诗歌中的运用其及效果。     

Man Is Unable to Change the Miserable Life——Analysis of the Arrangement of Four Characters in The Glass Menagerie

Tennessee Williams is considered as one of the most important American playwrights since World War II.The Glass Menagerie is his first successful drama,which describes a tragic situation of family and means to say that Man is unable to change the miserable life,no matter whatever means he try,This essay focuses on the analysis of the arrangement of the four main characters:Laura.Amanda,Jim and Tom to reveal the theme.Laura is fragile.Amanda is brave.Jim is vital.Tom is sensible.And all of them develop and try the different means to struggle against life,but fail tragically.With the evidence,the paper comes to conclusion naturally that Man is unable to change the miserable life,and he dooms to fail.     

Characterization of root-nodulating bacteria on Retama raetam in arid Tunisian soils

The aim of this study is to investigate the diversity of Retama raetam root-nodule bacteria isolated from arid regions of Tunisia. Twelve isolates, chosen as representative for different 16S rRNA gene patterns, were characterized by 16S rRNA gene sequencing and phenotypic analysis. Isolates were assigned to Sinorhizobium, Rhizobium and Agrobacterium. Symbiotic properties of Sinorhizobium and Rhizobium isolates showed a large diversity in their capacity to infect their host plant and fix atmospheric nitrogen. Strain RK 22 identified as Rhizobium was the most effective isolate.     

An Affordable Accurate Evaluation of the Binding Conformations Predicted by Molecular Docking Studies in Bio-System

正Recently,docking has been widely used to predict the binding-modes of protein-inhibitors,when the crystal complexes structure was absent.Most docking algorithms are able to generate a large number of probable conformations,it,however,is difficult to effectively evaluate these docking poses and identify the most reasonable bindingmode.In the present study,on the basis of the crystallographic data of human 3-hydroxy-3-methylglutaryl coenzyme