Synthesis and Crystal Structure of a Novel Two-dimensional Layered Polymer [Zn(μ-O_2CCH=CHCO_2)(C_3H_4N_2)(H_2O)]_n

The title complex [Zn(-O2CCH=CHCO2)(C3H4N2)(H2O)]n was prepared by the reaction of zinc carbonate with maleic acid and imidazole in an aqueous-alcohol solution at 333 K, and its crystal structure has been solved by single-crystal X-ray diffraction. The complex crystallizes in the monoclinic system, space group Pc with a = 5.3858(7), b = 22.685(3), c = 7.6782(1) ? = 92.261(2)o, V = 937.4(2) 3, Z = 1, C14H16N4O10Zn2, Mr = 531.05, Dc = 1.882 g/cm3, = 2.623 mm1, F(000) = 532, the final R = 0.0372 and wR = 0.0930 for 1926 observed reflections with I>2s(I). The central zinc atom is five-coordinated in a distorted square pyramidal environment to three oxygen atoms of two different maleate ligands, a nitrogen atom of the imi- dazole ligand and an oxygen atom of water. In the complex two carboxylate groups of the maleate ligands have two coordination modes. One acts as a bidentate chelate ligand and the other a monoatomic monodentate ligand to bridge two zinc centers. As a result, 1-D infinite polymeric chains are formed, which are linked together by pairs of OH…O hydrogen bonds between the coordination water OH groups and carboxylate oxygen atoms to construct a 2-D layered polymer, and the layer structure is stabilized by p-p stacking of the imidozel ligands.

2-D Modeling and Calculations of Stratospheric Ozone and Influences of Convection, Diffusion, and Time

An engineering system approach of 2-D cylindrical model of transient mass balance calculations of ozone and other concerned chemicals along with fourteen photolysis, ozone-generating and ozone-depleting chemical reaction equations was developed, validated, and used for studying the ozone concentrations, distribution and peak of the layer, ozone depletion and total ozone abundance in the stratosphere. The calculated ozone concentrations and profile at both the Equator and a 60˚N location were found to follow closely with the measured data. The calculated average ozone concentration was within 1% of the measured average, and the deviation of ozone profiles was within 14%. The monthly evolution of stratospheric ozone concentrations and distribution above the Equator was studied with results discussed in details. The influences of slow air movement in both altitudinal and radial directions on ozone concentrations and profile in the stratosphere were explored and discussed. Parametric studies of the influences of gas diffusivities of ozone DO3 and active atomic oxygen DO on ozone concentrations and distributions were also studied and delineated. Having both influences through physical diffusion and chemical reactions, the diffusivity (and diffusion) of atomic oxygen DO was found to be more sensitive and important than that of ozone DO3 on ozone concentrations and distribution. The 2-D ozone model present in this paper for stratospheric ozone and its layer and depletion is shown to be robust, convenient, efficient, and executable for analyzing the complex ozone phenomena in the stratosphere. .

冀东油田南堡2号构造古潜山成藏条件及模式

老堡南1井在奥陶系古潜山喜获高产油流,掀起南堡凹陷古潜山油气勘探的高潮。在对南堡2号构造潜山油气成藏条件研究基础上,分析了潜山油气成藏的主控因素,建立了成藏模式。结果表明,南堡2号构造潜山油气成藏条件十分有利,良好的油气供给、长期继承性发育的断层和储集空间的发育是潜山油气富集的关键因素。潜山油气成藏模式具有多样性:潜山顶部风化壳油气藏以新生古储新盖和多向供烃为特点;潜山内幕油气藏具有新生古储古盖和单向供烃的特点;与烃源岩隔断层侧向相邻的潜山底部风化壳具有新生古储古盖和单向供烃的成藏模式。断层和不整合在潜山油气藏形成过程中起重要控制作用。古潜山风化壳型和内幕型油气藏勘探潜力巨大,是今后南堡2号构造潜山油气勘探的重要方向。

2.5-D DC Resistivity Modeling Considering Flexibility and Accuracy

We highlighted the flexibility of using unstructured mesh together with the local refinement by a resistivity model with complicated topography. The effect of topography is emphasized. Based on this, we calculated a specific class of layered models and found that the accuracy is not always satisfactory by utilizing the standard approach. As an improvement, we employed the layered earth as the reference model to calculate the wavenumbers. The comparison demonstrates that the accuracy is considerably improved by using this enhanced approach.

断陷盆地多样性潜山成因及成藏研究——以济阳坳陷为例

以区域动力系统为背景 ,以构造的时空演化为主线 ,以断陷盆地为单元 ,提出了潜山的成因及结构分类方案 ,研究了断陷盆地潜山成因的动力学机制 ,揭示了潜山类型的多样性、分带性及时空展布规律。探讨了潜山内幕层状储层形成机理 ,提出了内幕层状油气成藏理论新概念 。

渤海湾盆地黄骅坳陷港北多层系潜山结构特征与成藏模式

渤海湾盆地黄骅坳陷港北潜山于中、古生界取得勘探突破,开启多层系潜山油气勘探新领域。由于多层系潜山复杂的多元结构特征及成藏地质条件,导致对其结构特征、地层展布以及成藏特征等认识不清。根据地震、测井、录井、试油及测试等资料,对港北潜山的结构特征与成藏模式进行研究。结果表明受控于多期次构造、沉积演化及港西断裂翘倾作用,港北潜山横向上呈“东西成排、南北分段”的构造格局,纵向上呈多层系叠置的“屋脊状”三元结构特征,由下古生界、上古生界和中生界3套地层组成,分别以奥陶系碳酸盐岩、二叠系碎屑岩和侏罗系火山岩为主要储层,这些优质储层与内幕隔层组合形成多层系潜山;港北多层系潜山具有良好的油气成藏地质条件,发育2套烃源岩、3套储集层、8套储盖组合,受控于输导体系构建的2类源储配置及2期油气充注,形成“晚期双源混注、断储复合输导、源储配置控藏、多层系差异聚集”的潜山成藏模式;多层系潜山广泛发育于渤海湾盆地中、古生界,且勘探潜力大,是今后潜山勘探的重要目标。

高韧性三元层状陶瓷:从MAX相到MAB相

三元层状化合物MAX相和新近引起人们注意的MAB相以其兼具陶瓷和金属的共同特性成为结构陶瓷领域20余年的研究热点,而高损伤容限和高断裂韧度是其区别于传统陶瓷的本质特征。本文简要回顾了MAX相的整体发展脉络和MAB相的最新研究进展,重点分析了纳米层状结构对宏观力学行为的影响及其内在机制。基于第一性原理计算结果建立的键刚度模型在实现对化学键强度的定量表征基础上,更重要的是阐明了"足够"弱的层间结合是三元层状陶瓷表现出非凡力学性能的根本原因。而Fe_(2)AlB_(2)在室温附近所出现的磁热效应(MCE)则显示了MAB相化合物在功能领域的良好应用前景。经过20余年的持续研究,MAX相化合物的结构和性能逐渐变得清晰,目前针对具体场景的应用研究在世界各地蓬勃开展起来。然而,目前对MAB相化合物的认识还很有限。因此,合成和表征现有已知MAB相化合物的结构、力学性能、物理性能以及基于应用背景的使役行为是现阶段的重要任务。其中,基于密度泛函理论(DFT)的第一性原理数值模拟可扮演重要角色,正如其在理解MAX相化合物的非凡性能和发现新型化合物时所起的重要作用一样。

具有埋层的大功率集成器件二维简化模型分析

对具有埋层结构的集成大功率器件提出了导通电阻自限制二维模型。在假定条件成立时,推导出器件二维模型导通电阻自限制公式,得出了具有埋层结构的集成大功率器件结构其比导通电阻是随着面积不断增大的结论。通过实验,证实了该结论预测趋势的正确性。该结论对类似集成化大功率器件结构设计具有一定的指导作用。

层状地基土双自由度集总参数模型的参数识别

在土-结构的动力相互作用简化分析中,常采用双自由度集中参数模型简化土层。这种模型适合各向同性的单一土层,而实际工程场地的地基土多是各向异性的成层土层。为了将这一模型应用于此类土层,本文根据实际地震动记录,提出了一种变阻尼最小二乘反分析方法,可用来识别模型中的各个参数值。文中提出的方法具有适用范围广、计算精度较高的优点,并已通过编制FORTRAN程序加以实施和应用。

渤海深层变质岩潜山油藏裂缝主控因素及预测

渤中13-2大型潜山地区是渤海海域发现的首个亿吨级深层变质岩潜山油藏。通过已钻井的岩心、薄片、测试、测井等资料,从构造演化、成岩作用、古地貌特征等方面,阐述了研究区潜山储集空间类型、裂缝发育主控因素及分布规律,为研究区的高效开发奠定基础。研究结果表明:(1)多期次构造运动是导致裂缝形成的主控因素,风化淋滤和裂缝充填是造成储层纵向差异的主要原因。(2)利用结构张量场与绕射波耦合属性可以有效指导研究区储层平面预测,根据最大似然属性体能够较好地预测潜山裂缝走向。(3)平面上靠近大断层附近裂缝发育较好,纵向上风化带裂缝好于内幕带裂缝,渤中13-2地区主力层段风化带储层可划分为4类,Ⅰ类储层最好,主要位于构造高部位;Ⅱ类储层次之,主要位于构造腰部;Ⅲ类储层较差,主要位于距离断层较近区域的构造翼部;Ⅳ类储层最差,主要位于距离大断层较远处。