天津蓟县晚更新世象化石分布与地貌特征

描述和对比了天津蓟县晚更新世地层发现的纳玛象、诺氏象第二门齿及第三臼齿化石,由于4处化石发现地均在天津蓟县，相互之间距离很近，且都在山前丘陵和平原区内，故具有一定的地域特点，小范围内发现古菱齿象属的2个种，在北方具有一定代表性，说明在晚更新世温暖期中，蓟县由于特殊地貌所形成的森林茂盛、淡水充沛、气候温和的特点，更适合象及其他如鹿、牛、羊等大型哺乳动物的生长和繁殖．     

淮河古象化石

1972年冬,在安徽省怀远县茨淮新河工地,发现了一具长8米、高4米多的体形巨大的象化石.从化石的骨缝和骨骺的愈合、门齿的"年轮"和臼齿磨蚀等情况来推算,它的年龄约在60岁以上,是一头老年公象.根据它的臼齿情况来看,是窄形臼齿,齿板19个,齿脊频率48,齿脊是长条形,中部扩大,形成菱形图案.同时,根据头骨、骨架等特征的研究,它属于诺氏古象的一个亚种.定名为"淮河古菱齿象"(简称淮河古象).     

世界最完整的板齿象(续)

身世篇几乎所有人都知道,如今地球上生活着两种象——非洲象和亚洲象.这两种象来自不同的近祖,亚洲象的祖先是曾经生活于南亚的一种真象,而非洲象起源于一种古菱齿象.一般认为,生活在五百万年前的脊棱齿象是这两类象的祖先.早在几百万年前,象类曾经是一个极其繁盛的家族.其中有脊棱齿象的祖先——具有丘形结构臼     

论淮河过渡性生物区、性状接引原则及自然史工程

本文论述了安微巢县等地第四纪沉积中哺乳动物化石群同属淮河过渡区中的古菱齿象——披毛犀动物群。根据性状接引原则的论点,淮河过渡区这一生物地理分异具重要演化、生物迁移和古生态意义。自然史工程的主要内容指在漫长地质年代中相邻生物区及过渡生物区中亲近种的长期接触导致了新种(或新亚种)的产生。对生物系统分类有重要意义。     

科技期刊亮点

中国发现豕脊齿象属头骨化石象类化石历来引人注目, 但大部分的发现都是一些零碎的牙齿, 完整的头骨少之又少。最近,中国科学院古脊椎动物与古人类研究所的王世骐和邓涛报道了发现于     

广东茂名盆地始新世哺乳动物化石的发现

记述了发现于广东茂名盆地始新世油柑窝组的一种哺乳动物化石——杨氏路南兽(相似种)Lunania cf. L. youngiChow,这是该区首次发现哺乳动物化石,对该区古近纪地层划分与对比以及进一步研究我国南方古近纪哺乳动物群的分布与演化具有重要意义。     

文化播报

正我国首次发现2.9亿年前史前巨鲨近日,来自中科院古脊椎动物与古人类研究所等单位的研究人员在山西阳泉地区首次发现2.9亿年前史前巨鲨——瓣齿鲨。该发现刷新了瓣齿鲨属在全世界的化石分布纪录,对研究我国华北地区二叠纪乌拉尔世时期海洋生物多样性与分析指示古环境有重要意义。同时,     

末次间冰期赵店动物群的地层时代探讨

报道了在山西襄汾赵店采砂场,黄土下部砂层中发现了哺乳动物群化石,并对化石出土层位的时代和古环境进行了分析.在赵店的动物群化石中除最后鬣狗和虎外,基本上与丁村动物群相同,出土层位也与丁村组相似.从化石出土层位上覆黄土古土壤序列分析,化石层与S1古土壤发育时代相当,其时代上限为距今7.5万年,当属末次间冰期,气候相对温暖湿润.     

山东临朐中新世山旺湖古环境初探

本文以孢粉分析资料为基础,运用孢粉植物群的古生态环境分析方法初步探讨了山东临朐山旺中新世山旺湖的演变历史,并对当时的古植被类型、古气候条件、古地理面貌作了简要的分析。这是运用孢粉分析资料对古环境进行研究的一个初步尝试,将为研究某一段带的地质发育历史及史前时代考古提供一个新的研究途径。 文中所列孢粉化石科属中有不少为首次发现,特别是水生菱属植物的花粉化石不但首次在山旺组地层中发现,而保存极为精美,这就进一步丰富了山东临朐中新世山旺植物群的内容,并为探讨古环境提供了新资料。 文内附图版四个(其中图版Ⅳ为扫描电子显微镜拍照),附图两张。     

甘肃宝积山盆地晚三叠世2种有节类茎干3D形态恢复

在甘肃省宝积山盆地上三叠统南营儿组采集到了2种有节类化石,似木贼属短齿似木贼和新芦木属霍尔新芦木,以此2种化石为材料,利用多幅图像3D恢复的方法来重建有节类化石茎干的3D形态.在多幅图像3D恢复的基础上,利用Matlab图像处理语言来实现短齿似木贼和霍尔新芦木3D模型图的提取处理.结果能很好地重建研究区当前化石的3D形态,对古植物学形态研究及其与计算机3D恢复技术的交叉应用具有一定的参考意义.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

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.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to