多孔介质内自然对流传热传质研究

该文研究了含内热源圆柱形多孔介质内不均匀温度分布产生的浮力效应引起的自然对流。给出了以流函数表示的无量纲基本方程,用控制容积法对方程离散并进行了数值计算,得到了多孔介质内的流场、温度场和浓度场,讨论了瑞利数Ｒａ和刘易斯数Ｌｅ对多孔介质传热传质的影响。     

竖直圆柱空间多孔介质中非牛顿流体自然对流

建立了封闭圆柱空间多孔介质中非牛顿流体自然对流的数学模型，通过理分析和数值计算，获得了在不同达西－瑞利数Ｒａ和不同流变指数ｎ下，非牛顿流体的流变特性，Ｎｕ随Ｒａ和ｎ的变化规律，以及Ｒａ和ｎ对流场和温度场的影响。     

多孔介质中热对流二次分岔的数值分析

目的 进行了多孔介质中热对流二次分岔的数值分析。方法 采用了扩展方程方法,此方法无需求解原动力学方程和辅助参数。结果 得到了长度比为１￣√２矩形区域内多孔介质中热对流二次分岔点的Ｒａｙｌｅｉｇｈ数及相应的流场和温度场分布。结论 所给方法对确定二次分岔点是有效的。     

矩形封闭空间内非饱和多孔介质自然对流的近似分析解

从合湿多孔封闭腔内流体流动与传热特征出发，提出了一种线性近似假设法，并用该法对矩形封闭腔内含湿多孔介质的自然对流行为进行了近似分析求解，得到了其温度分布、速度分布与传热数表达式．该近似解在形状比Ａ＞３及当量瑞利数Ｒａ＃＝１０～２５０的范围内具有较好的准确性     

多孔介质振荡流格子-Boltzmann模拟

为研究多孔介质内振荡流流动特性,该文将格子-Boltzmann方法对多孔介质内的振荡流过程进行了数值研究.采用四参数方法构造了多孔介质结构模型,对多孔介质内的振荡流过程的模拟结果表明;多孔介质振荡流的最大压差随最大Renoylds数的增加而迅速增加,在Renoylds数小于100的范围内,最大阻力系数与最大Renoylds数呈反比例关系,与文献报道的实验结果一致;在孔隙率小于0.85范围内,压差与流速之间的相位差变化较小,孔隙率继续增加时,相位差随孔隙率的增加而线性降低.     

圆筒型管式加热炉中加装多孔介质强化辐射传热的研究

根据多孔介质的对流－辐射能量转换效应，在圆筒型管式加热炉中加装多孔介质后，使炉内温度显著升高，排烟温度明显降低．在内径为４００ｍｍ的模型炉实验中，有多孔介质时的炉温比无多孔介质时的炉温升高约５０～１００℃，有多孔介质时的炉子热效率比无多孔介质时炉子热效率提高约１０个百分点．实验结果与理论计算符合得较好．     

牛顿流体在充满多孔介质圆管内的结构流特征

引入研究多孔介质流体流动的体积平均方法和体均原理,采用Darcy阻力经验公式和Forch-heimer修正,得到了多孔介质内流体流动的Brinkman-Forchheimer广义Darcy定律.提出了牛顿流体在充满多孔介质管道内的结构流概念,并通过边界层动量积分计算证实了流核的存在,获得了流核流速和流核半径的计算结果;分析了Darcy数和惯性参数对速度剖面的影响程度.     

与Rayleigh商矩阵有关的一些问题

研究与Ｒａｙｌｅｉｇｈ商矩阵有关的两个基本问题，其一，Ｒａｙｌｅｉｇｈ商矩阵特征值的扰性质，其二，Ｒａｙｌｅｉｇｈ商方程组的扰动理论，最后讨论本文主要结果与Ｂｏｔｔ－Ｄｕｆｆｉｎ系统及Ｌａｎｃｚｏｓ算法的联系。     

多孔介质平板通道发展传热的强迫对流及其热应力分析

基于Darcy模型,考虑固相和流相相互作用的粘性耗散和流体流动方向的热传导效应,研究了半无限长多孔介质平板通道局部热平衡的热发展强迫对流及其热应力问题,给出了多孔介质温度、局部Nusselt数Nu和热应力等的Fourier级数解,并考察了多孔介质温度、应力分布等的特征.同时研究了Peclet数和Brinkman数对它们的影响.     

从郎之万方程出发建立多孔介质微观模型

岩土类多孔介质宏观物理力学性质是岩土工程界关注的焦点,其关键是岩土类多孔介质本身的复杂的微观结构。综述了当前多孔介质建模的研究现状,简要分析了各种模型建立方法的优势和劣势。针对多孔介质建模的复杂性,从随机动力学相分离过程的朗之万方程出发,将多孔介质的形成过程看作是固相粒子和孔隙相粒子相互作用演化的结果,建立了构造随机多孔介质的微观生长模型。通过不断向空间播撒固相粒子和孔隙相粒子控制多孔介质的演化过程,同时计算了不同参数条件下演化过程中多孔介质孔隙率、欧拉数以及分形维数的变化趋势。由于考虑了固体相和空隙相粒子之间的相互作用力,本模型生成的多孔介质与自然界真实的多孔介质更为接近,存在连通和不连通的孔隙结构,孔道迂回曲折。通过与真实样品的微观结构的比对,验证了本模型的实用性,可行性。     

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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.     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.