Hydrocarbons in surface layer bottom sediments from the North Dvina Riverand the southern part of the Dvina Bay, White Sea

Analysis of molecular composition of alkanes in bottom sediments of the southern part of Dvina Bay (White Sea) in October 2001 revealed the following main peculiarities of hydrocarbon behavior in the estuary: dominating of high molecular C23-C45 compounds and irregular distribution of hydrocarbons in bottom sediments as a result of high sedimentation rate and active hydrodynamics in the studied area.

El discurso sobre la victimización de la mujer afgana como estrategia y justificación para la permanencia de las tropas estadounidenses en Afganistán (2001-2013)

La presente investigación pretende demostrar que la principal estrategia estadounidense para justificar su intervención y permanencia en territorio afgano ha sido el discurso. Donde se pueden identificar dos etapas a lo largo de esta última década. Inicialmente para explicar su incursión en Afganistán se utilizó el discurso de la seguridad y la guerra contra el terrorismo, años después frente al agotamiento y la critica tanto interna como internacional, el tema de la situación de la mujer en Afganistán cobra mayor importancia y con ello a través de los diferentes pronunciamientos y la exposición de casos específicos los diferentes gobiernos intentan cohesionar la opinión internacional y nacional frente a la necesidad de permanecer con sus tropas en el territorio.

Democracy and participation in Singapore : a case study

A typical characteristic of the ongoing practice of democracy in Singapore has been described by some scholars as 'illiberal democracy'. Noting that Singapore 's brand of democracy operates within a 'dominant, one-party system', other scholars cushioned such a democratic practice by their reference to 'semi-democracy', 'controlled democracy, 'guided democracy, and 'communitarian democracy'. However, despite the demonstration that there are many restrictions in the type of democracy that exists in Singapore, the benefits are numerous. Singapore is the only country in the world to have transformed itself from a developing country to a developed country in less than only forty years. But its slower move towards a culture ofparticipation must move as quickly as globalization does if it is to remain in relevant and legitimate democracy. If the younger generation understands that they should have the right to a voice before the government acknowledges it, the transition could be more tumultuous than necessary.

Organically templated linear and layered cadmium sulfates

By reacting cadmium salts with H2SO4 in the presence of organic amines or directly with amine sulfates under hydrothermal conditions, it has been possible to prepare three linear cadmium sulfates of linarite topology, with the compositions [H3N(CH2)(2)NH3](2)[CdCl2(SO4)][SO4].H2O, I, [HN(CH2)(6)NH][CdBr2(SO4)], II, [HN(CH2)(6)NH][CdCl2-(SO4)], III. A layered cadmium sulfate of composition [H3N(CH2)(3)NH3][Cd-2(H2O)(2)(SO4)(3)], IV, has also been obtained. These sulfates are the first examples of a family of organically templated metal sulfates with interesting structural features. In the linarite chains, the CdX4O2 (X = Cl, Br) octahedron shares two trans-edges to form an [Mphi(4)] (phi = anionic ligand) chain decorated by the SO4 tetrahedron that adopts a staggered arrangement on either side of the chain. IV is constructed by the fusion of four-membered ring ladders involving edge sharing between the sulfate tetrahedron and metal octahedron. IV appears to be the first member of a family of organically templated metal sulfates containing an octahedral-tetrahedral 2D net wherein the sulfate tetrahedron is connected at all four corners.

多煤层开采时岩层垮落过程的数值模拟

运用自行开发的岩层破断过程分析 (SFPA2D)系统模拟了多煤层开采时岩层的垮落过程。数值模拟结果表明 ,虽然上部煤柱的存在改变了上覆岩层结构 ,但岩层的垮落仍具有明显的周期性 ,地表的水平移动和垂直下沉仍具有明显的对称性 ;当垮落带高度达到上部煤柱后 ,可能出现大面积的垮落 ,产生较大的次生来压现象 ,从而影响下部长壁工作面的安全。通过和相似材料模拟以及理论分析结果的对比 ,本次数值模拟基本上反映了多煤层开采时采动岩体的动态发展过程 ,SFPA2D系统可以作为模拟采动覆岩破坏过程的一种新方法

用于海洋监测的小水线面双体船设计的构想及分析

本文简要介绍了小水线面双体船设计特点 ,列举了一种应用于海洋监测的小水线面双体船的构想 ,对其兴波阻力小的特点进行了一些分析 ,给出两个水下部分的相互干扰作用的结果

油气田开发动态监测的新手段——数值试井分析

<正>动态预测是由反问题的求解并结合数值模拟技术,研究地层压力与采出井、注入井生产动态的相互关系,根据油气井的产量变化预测地层压力场变化,由注入井压力预测采油井压力,为进行油气田开发方案编制提供必备的基础数据,是油气田经济合理开发的必要保障。试井技术作为动态预测的主要手段是从20世纪30年代提出,发展到现在已经有近70年