首页 | 官方网站   微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 140 毫秒
1.
中国蝗虫的新属和新种:(直翅目:蝗总科)   总被引:1,自引:0,他引:1  
在我国西北和西南地区,采得蝗虫1新属4新种,即新疆蝗属,新属Xin jiangacris gen.nov.,红胫新疆蝗,新种X.rufitivis sp. nov.,黑翅牧草蝗,新种Omocestus nigripenmus sp. nov.,宁夏蛛蝗,新种Aervopedellus nangxiaensis sp. nov.及武陵山金色蝗,新种Chrysacris wulingshanensis sp.nov.  相似文献   

2.
广西蚱亚科一新属二新种记述(直翅目:蚱科)   总被引:8,自引:0,他引:8       下载免费PDF全文
记述采自广西蚱亚科一新属二新种,即突顶蚱属,新属Exothotettix gen.nov.广西突顶蚱,新种Exathotettix guangxiensis sp. nov.及突缘尖顶蚱,新种Tertdorus prominemarginis sp.nov.  相似文献   

3.
中国自由生活海洋线虫研究进展   总被引:1,自引:0,他引:1  
综述了海洋自由生活线虫研究的意义和我国海域自由生活线虫的研究现状和研究进展,分别报道了我国四大海区自由生活线虫的丰度和多样性情况,列出了各海区所发表的新种名录.目前,我国海域共鉴定报道了自由生活海洋线虫260余种,隶属于118属,36科,4目,其中包括3个新属和76个新种.  相似文献   

4.
本文材料系2004年7月至2006年7月在台湾海峡南部上升流区水域采集的.通过377份软水母亚纲样品分析,报道了一个四管水母新属新种Tetracannoides jingzhii gen.et sp.nov.和3个新种:多管十盘水母,新种Staurodiscus multicanalis n.sp.;漂浮十盘水母,新种Staurodiscus neustona n.sp.;薇八拟杯水母,新种Octophialucium huangweiae n.sp..对新属新种的形态特征均进行详细描绘,为今后海洋调查及编写水螅水母动物志提供参考.  相似文献   

5.
安徽北部上寒武统凤山组的牙形刺及其地层   总被引:1,自引:0,他引:1  
上寒武统含牙形刺地层广泛分布于中国许多省份,安徽省是其中之一,根据三叶虫和牙形刺化石组合,作者修改了前人对上寒武统地层的划分方案,建立了三个牙形刺组合带,并可与三个三叶虫化石带进行对比.(见表Ⅱ、Ⅲ) 本文描述了三个新属:原端牙形刺属(Prodistacodus gen.nov),原始齿牙形刺属(prodentatudus gen,nov.),三角形牙形刺属(Triangtdatudus gen.nov.);十个新种:四方黑尔兹牙形刺(Hertzina quadrata sp.nov.),风山箭牙形刺(Oistodus fengshanensis sp.nov.),环纹原牙形刺(proconodontus anulatus sp.nov.),长形原牙形刺(proconodontus longiformis sp.nov.),有齿原始齿牙形刺(prodentatudus dentatus sp.nov.),翼状原奥尼昂塔牙形刺(Prooncotodus alatus sp.nov.),钩状原奥尼昂塔牙形刺(Prooneotodus hamatus sp.nov.),舌状原镞牙形刺prosagittodontus lingulatus sp.nov.),安徽三角形牙形刺(Triangulatudus anhuiensis sp nov.),浅沟韦斯特牙形刺(Westeryaardodina incilis sp.nov.);及一新亚种:锯齿诺契匹克原牙形刺(proconodontus notchpeakensis serratus subsp.nov).  相似文献   

6.
2003年1月在南黄海鲤鱼潮下带22个站位采集了沉积物样品,对自由生活海洋线虫的种类组成和多样性进行了分析研究.不同站位海洋线虫的丰度从每10平方厘米505条到1272条不等(平均831±247ind·10cm^-2).共鉴定出海洋线虫223种或分类实体,隶属于145属,32科,4目,其中建立了3个新属,发现并描述了19个新种.种类最多的是15094站,有82种;最少的是9794站,只有26种.8794站的优势度最高,多样性最低;而7674站和10894站的多样性最高.主要优势种是Dorylaimopsis rabalaisi,Terschellingia longicaudata,Sphaerolaimus balticus,Metalinhomoeus longiseta,Quadricoma scanica,Prochromadorella sp.,Paramonohystera riemanni,Marylynnia sp.1,Vasostoma spiratum,Halalaimus spp,Pierrickia sp.1和Promonhystera faber等.群落的多样性与沉积物粒度有关,Pearson相关性分析表明,多样性指数(H’)与沉积物含砂量呈极显著正相关,与粉砂粘土含量和中值粒径呈极显著负相关;种丰度指数(d)与沉积物含砂量呈显著正相关,与粉砂粘土含量和中值粒径呈显著负相关.  相似文献   

7.
本文材料系2004年7月至2006年7月在台湾海峡南部上升流区水域采集的.通过377份软水母亚纲样品分析,报道了一个四管水母新属新种Tetracannoides jingzhii gen.et sp.nov.和3个新种:多管十盘水母,新种Staurodiscus multicanalis n.sp.;漂浮十盘水母,新种Staurodiscus neustona n.sp.;薇八拟杯水母,新种Octophialucium huangweiae n.sp..对新属新种的形态特征均进行详细描绘,为今后海洋调查及编写水螅水母动物志提供参考.  相似文献   

8.
本文描述了来自安徽寿县八公山刘老碑组的弯曲大型疑源类(Cyphomegacritar-chs)化石,共两个属,三个种。它们是:Stenocyphus subtilis gen.et sp.nov.,Eurycyphus Jycotropus gen.et sp.nov.,E.altilis gen.et sp.nov.。弯曲大型疑源类一词由笔者首次提出,产于晚前寒武纪地层而为分类位置未定的宏观化石。首先明确这类化石的形态术语,并对这三个新种用数学模拟方法给予定量描述。从而说明弯曲大型疑源类(除去个别的和后期变形的标本以外)都具有抛物线形态,符合抛物线标准方程y~2=2px。其次给出S.subtilis gen.et sp.nov.,E.lycotropus gen.etsp.nov.,E.altilis gen.et sp.nov.三个新种典型抛物线标准方程。它们分别是:y~2=0.25x,y~2=1.50x,y~2=5,80x。同时,可以看出化石的弯曲程度与p值的变化成反比。p值愈大,臂端间距愈大,化石的弯曲度愈小;p值愈小,臂端间距愈小,化石的弯曲度愈大。  相似文献   

9.
本文描述了产自中国云南省盘菌目Pezizales新属——假地耳属Otideopsis Liu et Cao gen.nov。和新种——云南假地耳O.Yunnanensis Liu et Cao sp.nov.,并对其在盘菌目中的系统地位作了论述。  相似文献   

10.
描记采于云南省南盘江水系野鲮亚科-新属新种.新属下唇有5个圆珠状结构呈一串念珠状与中国产野鲮亚科20余个属均不同,命名五珠鲮属Fivepearlus gen.nov..新种命名云南五珠鲮Fivepearlus yunnanensis sp.nov..  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…  相似文献   

14.
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。  相似文献   

15.
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.  相似文献   

16.
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。  相似文献   

17.
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.  相似文献   

18.
19.
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  相似文献   

20.
Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司    京ICP备09084417号-23

京公网安备 11010802026262号