河北曲阳晚古生代植物群及古地理研究

在河北省曲阳石炭一二叠纪地层中发现古植物化石29属62种,包括真蕨纲和种子蕨纲、楔叶纲、石松纲、瓢叶纲、苏铁纲、种子化石、科达纲、银杏纲.此古植物群华夏植物群的特点明显,纵向上可划分成5个古植物组合;演化具有阶段性,组合的变化与古地理6个演化阶段相适应.     

陕西店头矿区延安组植物组合及其时代归属

本文详细论述了陕西黄陵县店头矿区延安组植物群面貌及组合特征;根据古植物化石在纵向上的分布,将延安组植物群划分五个植物组合;在考虑该组植物群特征的同时,结合延安组沉积古地理特征,岩性特征将延安组第1段地层划入早侏罗世,其余4段地层划归中侏罗世。     

广州地区前华夏植物群研究

广州地区晚泥盆世至早石炭世植物群计 2 3属 4 1种,以真蕨纲和种子蕨纲为主,石松纲居次,另外还有少量楔叶纲、科达纲及种子化石.按地层分布当前植物群可分为沙水岗组植物组合、龙江组植物组合及测水组植物组合.分析该植物群的组成特征,其性质属前华夏植物群     

广州西北郊上泥盆统植物化石

本文所描述的植物化石是分别在广州西北郊龙尾岗、大沙村、沙水岗和牛岗等处发现的。早在1930年哈安姆曾对这一地区的地质进行初步调查,并认为这一地区的地层的地质时代为二叠纪。笔者在1958年把这些地层改属于中石炭世。其后,各部门的地质队亦继续在这一地区进行调查研究,并分别提出泥盆纪、泥盆石炭纪和早石炭世等地质时代。由于均未发现化石,上述的各种地质时代仅是推论而已。直到1962年,这一地区的地层所含的化石才被中山大学地质地理系的学生发现。这一地区所产的植物化石相当丰富。但动物化石则较少,而且保存不完全,在地层时代的鉴定上不起什么作用。本文描述的植物化石有下列属种: Leptophloeum rhombicum Dawson Cyclostigma kiltorkense Haughton Sublepidodendron mirabile(Nathorst) ef. Sublepidodendron mirabile(Nathorst) Lepidodendron sp. nov. Lepidostrobus sp. nov. Lepidophyllum sp. Sphenopteris sp. 在这些植物化石中,Leptophloeum rhombicum和Cyclostigma kiltorkense是晚泥盆世的标准化石。Sublepidodendron mirabile的时代由早泥盆世到晚石炭世。它们是我国晚泥盆世陆相地层最常见的植物化石。因此含这些植物化石的地层可以和中国其他地区含同样化石的地层相比较。现在成问题的是沙水岗和牛岗等地质剖面。这些剖面含Lepidodendron, Lepidostrobus,Lepidophyllum和Sphenopteris。如果单从植物化石来考虑,这些剖面的地质时代应属于早石炭世。但有两种情况值得注意:(1)和龙尾岗和大沙村的剖面一样,它们的岩性亦以红色岩层为主;(2)从地理位置上看,它们的层位和产Leptophloeum rhombicum的龙尾岗的孰高孰低不易判断。因此现将沙水岗和牛岗等剖面暂定为泥盆石炭纪。     

内蒙古东部霍林河煤田晚侏罗世—早白垩世植物及含煤地层初步研究

本文报道了我国内蒙古东部霍林河煤田植物化石及其生物地层的初步研究,概要的介绍了目前确定的34属62种大植物化石及部分孢粉。淡水瓣鳃类等化石.根据植物群的组成特征及同相关植物化石群的对比,认为霍林河植物群及其产出地层的时代为晚侏罗世—早白垩世.通过植物群组合性质研究,提出晚侏罗世—早白垩世时期霍林河地层可能曾地处北半球或暖温带.     

江西南部崇义组植物群的时代与讨论

江西南部崇义组植物群的发现,为研究我国这一时代植物群提供了新的资料。本文在总结江西南部崇义组植物群研究成果的基础上,从植物群的面貌、鱼化石群的特性、上下层位关系、岩相古地理及与邻区类似植物群的对比等诸方面,讨论了祟义组植物群的时代,认为它属于晚期法门期代表我国独具特征的晚泥盆世末期的植物群.对江苏五通群植物群的时代问题也提出了新的认识.最后,对文中所提到的圆痕木属的一新种作了描述。     

江西南部祟义组植物群的时代与讨论

江西南部崇义组植物群的发现,为研究我国这一时代植物群提供了新的资料。本文在总结江西南部崇义组植物群研究成果盼基础上,从植物群的面貌、鱼化石群的特性、上下层位关系、岩相古地理及与邻区类似植物群的对比等诸方面,讨论了崇义组植物群的时代,认为它属于晚期法门期,代表我国独具特征的晚泥盆世末期的植物群。对江苏五通群植物群的时代问题也提出了新的认识。最后,对文中所提到的圆痕木属的一新种作了描述。     

塔里木盆地北缘陆相二叠系中的植物化石

新疆塔里木盆地北缘二叠纪陆相地层中的植物化石丰富，共现２８属４８种，本文对其中的８属９种作了详细的描述了讨论，当前材料不仅大大丰富了塔北二叠纪植物群的内容，对塔北二叠纪地层的划分与对比具有重要作用，而且为塔北二叠纪植物地理区系和古板块位置的研究提供了新论证。     

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。     

和政动物群见证青藏高原的隆起

和政动物群是指我国甘肃省和政地区发现的新生代古生物化石所代表的动物群。和政县位于兰州市南偏西约100千米处,行政上属于甘肃省临夏回族自治州。在地质学和古生物学上常常把发现在同一地方、同一时代的各种古生物化石组合统称为一个动物群,并经常以发现地或其代表动物命名。比如,著名的热河动物群就是发现于辽宁西部及华北地区白垩纪早期的一个古动物群,其中包括中华龙鸟等带羽毛的恐龙、孔子鸟等中生代鸟类以及哺乳动物和两栖动物等。后来,科学家在该地区的相同地层中还发现了大量植物化石,包括被人们称为第一朵花的"辽宁古果"等被子植物化石,于是科学家将热河动物群更名为热河生物群,即包括动物群和植物群的生物群。另外,三叠纪晚期的关岭生物群和中新世的山旺动物群等也是如此命名的。     

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.     

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.     

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~