A COMPREHENSIVE STUDY OF MUD CRACKS AND OTHER SIMILAR STRUCTURES

In text-books of geology and in most papers dealing with geologicstructures, mud cracks seem to have been regarded as merely one kindof structures developed only in soft sediments, such as muds or clays. Itseems also that the studies of mud-crack structure have been mostly     

“Red Beds”of Hunan

INTRODUCTION The term"Red Beds"has never been used in a restricted sense,because it could include formations of different ages and sometimes theyare not distinctly red in color.The"Red Beds"of Hunan were first     

近100年来里海土库曼湾沉积条件和生态学变化

作为形成于特提斯和东部亚特提斯海盆上的世界最大的内陆咸水湖里海 ,多年来已引起研究工作者极大的兴趣。里海东南部的海湾是研究最差的海区 ,对它的研究进行得最不正规和最不系统。对这个海湾产生兴趣是因为没有河流注入的这些海湾最完整地反映了里海盆地的海平面升降机制。本文对土库曼湾的沉积条件进行了研究 ,并在原有方法的基础上利用古生态资料 ,试图确定近百年来底栖生物群落的变化。沉积层的测年是在里海—亚速海盆外来种群剖面分布基础上进行的 ,而它们的进入时间为已知。对深达０．４５ｍ的表层沉积物采用了肉眼和镜下研究 ,然后…     

Identification of genes expressed in juvenile Haliotis rufescens in response to different copper concentrations in the north of Chile under controlled conditions

This study reports molecular markers potentially associated with resistance or sensitivity to the impact of copper in juvenile red abalone, Haliotis rufescens, in the north of Chile under experimental conditions. Genomic analysis was made applying subtractive hybridization libraries (SSH) to identify genes up-and down regulated during cooper exposure in abalone over periods of 12 and 168 h exposed to 2.5 and 10 μg/L of Cu⁺². Results obtained from the SSH library revealed 368 different sequences regulated by copper, that correspond to eight major physiological functions. The validation of these sequences obtained by SSH as well as their expression kinetics were made by PCR in real time on 14 potential genes regulated by metal stress. This study provides information for the characterization of potential genomic markers that may be used in future environmental monitoring and to investigate new mechanisms of stress to copper in this commercially important marine species.     

意大利威尼斯泻湖的自然特性和水体循环

威尼斯泻湖位于意大利北部,亚得里亚海边,是意大利最大的泻湖,水面面积约550 km2,平均水深1.1 m.入湖的陆地流域1 877 km2,每年流入泻湖淡水约900 Mm3.泻湖通过3个潮流通道与海洋交换水体和能量;因此,它传统上被分成3个水下盆地,每1个水下盆地对应一个潮流通道,一个潮周期内大量海水流进流出,总量相当于泻湖总容量的三分之一(Ga(c)i (c)等,2004).淡水通过许多支流注入泻湖,携大量的营养物质,这些物质主要沉积在北部泻湖地区(Zonta等,2001).最重要的支流位于泻湖的北面,这个区域2001年曾接受了超过总量50%的沉积物.同样,在泻湖区,有一个巨大的工厂,是意大利最重要的工业区之一.这些工业区是意大利热量、淡水和营养的重要来源.     

WISE USE OF WETLAND FOR SUSTAINABLE LIVELIHOOD THROUGH PARTICIPATORY APPROACH： A CASE OF ADAPTING TO CLIMATE CHANGE

1INTRODUCTION Hydroponics(aGreekword,hydromeanswater andponos,labour),asoil-lessagriculture,isa termtobedescribedinseveralwaysinwhichplants cangrowwithoutsoil,byuseofaninertmedium whereplantcantakeupessentialnutrients,either fromwaterinwhichanutrientsolutionisaddedor fromorganicmaterialsthatexistsinthemedium.Thesemediacanbegravel,sand,peat,vermiculate,prelite,sawdustorotherplantmatters(organiccom ponents).Therefore,theprocessinwhichaquatic weedsaredumpedonwatertoconstructfloatingbed orart…     

亚平宁（意大利）中南部地震之间静态应力相互作用的证据

计算了发生在亚平宁山脉（意大利）的几个地震所导致的静态应力变化。与断层流动有关的静态应力运用Ｏｋａｄａ（１９９２）提供的公式计算。形成１９８０年伊尔波尼亚Ｍｓ＝６．９主震的３个子事件造成的静态应力变化表明,每个子事件都连续地被前面的子事件所触发。而且,这个复杂断层事件的余震与库仑应力增加的区域有很好的相关性。区域应力与主震产生的局部应力变化之间的相互作用导致了比预想的更宽些的余震分布,并且震源机制     

地震过程理论基础

1.1概述地震预报属于预报事件发生地点、强度和时间问题,实际上也是现代地球动力学问题。如果熟知了认识地球动力学过程物理本质的方法学,那么,预报问题是可以解决的。因为,处在一定关系和相互作用的不同规模构造不均匀性(单元的)的总体,决定着实际地质介质的状态。我们必须系统地研究其与地震活动的关系,首先,认清总体本质并识别能代表主体对象的(不是各部分的混合体而是系统的)普遍特性,此外,把系统(主体对象)分成亚系统(高级对象)必须由系统(主体对象)内部特性来决定。因此,物质成分(物质)、物体结构(构造)、运转(运动、演化、所有过程的…     

A Large Therizinosauroid （Dinosauria： Theropoda） from the Early Cretaceous of Northwestern China

We herein describe an associated partial postcranial skeleton of a theropod dinosaur discovered in the Lower Cretaceous Xinminpu Group of the Yujingzi Basin, in the Jiuquan area of Gausu Province, northwestern China. Features of its humerus, such as strongly expanded proximal and distal ends, a well developed medial tuberosity, distal condyles expressed on the humeral cranial surface, and a hypertrophied entepicondyle, definitively establish the therizinosauroid affinities of the specimen. It differs from other therizinosauroids in having a shallow, poorly demarcated glenoid fossa with a prominent rounded and striated tumescence on the dorsomedial surface of its scapular portion, and a pubis with a strongly concave cranial margin. It represents a new taxon, Suzhousaurus megatherioides gen. et sp. nov. Cladistic analysis recovers Suzhousaurus as the sister taxon of Nothronychus mckinleyi from the mid-Cretaceous of western North America; together, they are basal members of the Therizinosauroidea, more derived than the Early Cretaceous Falcarius and Beipiaosaurus but less derived than Alxasaurus and the Therizinosauridae. Along with ＂Nanshiungosaurus＂ bohlini from possibly coeval beds in the Mazongshan area of northern-most Gansu, Suzhousaurus represents one of the largest-known Early Cretaceous therizinosauroids, demonstrating that this clade attained considerable body size early in its evolutionary history.     

The Spectroscopic Orbit of the Planetary Companion Transiting HD 209458

Three new silicon-bearing radicals of astrophysical interest, SiCCH and the two nearly isoenergetic isomers SiCN and SiNC, were detected in a laboratory discharge in their X2Pi ground states by Fourier transform microwave and millimeter-wave absorption spectroscopy. Hyperfine structure was observed in the low rotational transitions of the (2)Pi(1/2) ladder, and well-resolved Lambda-doubling was observed in both fine-structure ladders. With the spectroscopic constants derived from the laboratory measurements, the spectra of all three can be calculated to an uncertainty of less than 0.1 km s(-1) in equivalent radial velocity over the entire range of interest to radio astronomers. SiCN, with a dipole moment of 2.9 D, is probably the most promising of the three for astronomical discovery.