正交异性板三维高阶渐近分析的圣维南原理表述和应力边界条件

提出正交异性板的三维高阶渐近分析,其内部区域各阶渐近解为各级精度的二维板理论解,首项与著名的Kirchhoff板理论一致;而其边界层解则分解为半无限板条的平面应变和扭转变形解,因而也缩减为二维边值问题的分析。由Laplace变换方法对边界层半无限板条的分析建立了指数型衰减解的应力边界数据应满足的充分必要条件,此即圣维南原理在板渐近理论研究中的列式或表述。由此导出高阶板理论的应力边界条件,首项时与Kirchhoff板理论缩减的力边界条件一致。     

弹性板振动数学理论导论

本书是弹性板二维理论数学方面的经典导论，书中根据弹性三维理论振动方程的乘方级数展开，系统推导了各向异性弹性板的二维理论。从振动角度对二维问题的唯一性进行了检验。通过比较波的色散关系验证了二维方程准确性，二维理论与三维理论的预测一致，书中主要讨论了高频率的动力学问题，该理论在结构工程的传统应用中也非常有效，也为声波装置提供了理论基础。     

带人工粘性的二维可压欧拉方程强稀疏波的渐近稳定性

本文研究了一个带人工粘性的二维可压欧拉方程的解收敛于一维稀疏波的渐近行为.如果初值适当接近一个常数并且它们在x=±!的渐近值被选择,那么解收敛于一维稀疏波.由于不要求稀疏波的小强度,因此作者给出了二维可压欧拉方程强稀疏波的非线性稳定.证明方法利用了一维稀疏波的稳定性结果和L2能量方法.     

具有极点型奇点的二阶线性方程与广义解

给出二阶线性方程二阶极点邻域的级数形式解.传统观念认为适合方程的收敛级数才是方程的解.在这种观念的支配下,一些简单情形求得的发散级数形式上使方程成为恒等式,被称为解的渐近展开.发散级数适合方程并非个别现象.这个事实促使我们改变观念,承认使方程成为恒等式的发散级数是方程的(广义).     

二维空间中半线性波方程整体解的渐近性

研究二维空间中半线性波方程初值问题utt-△u=εf(u,ε), t＞0, x∈R2,u(0,x,ε)=u0(x,ε), x∈R2,ut(0,x,ε)=u1(x,ε), x∈R2,整体解的渐近理论.在古典空间C2中讨论了解的适定性及形式近似解关于时间T=∞时的合理性,并用这些结果描述了形式整体解的合理性.同时给出了该渐近理论的一个应用,在二维空间中分析了一个特殊的波方程.     

一类电报方程解的双扰动研究

运用非线性电报方程解的渐近理论,讨论了具有初边值条件的电报方程utt-uxx＋u＋εu2=0解的适定性和时间无穷大时其渐近近似解的合理性,同时使用偏微分方程双扰动方法,研究了在O（ε）近似条件下解的渐近性质.     

对空间曲面取矩的三维边坡稳定性分析方法研究

三维边坡稳定分析解析解的推导是岩土工程领域的难点.基于空间一点应力分析,进行了空间曲面上一点的应力分析,得出了曲面上一点的法向应力、剪应力与应力分量、曲面一阶偏导数的关系;建立了曲面至边坡表面土柱上力的微分平衡方程、力的平衡方程、力矩平衡方程.和库仑屈服条件一起,构成了边坡稳定问题普遍适用的基本方程组;采用与二维问题的简化Bishop法类似假定,得出了一种三维边坡稳定性分析的计算方法.算例表明本文方法计算结果是合理的,对下一步的推导和应用具有指导意义.     

二阶半线性微分积分方程的奇摄动边值问题

本文研究微分积分方程奇摄动边值问题（t，y，J，ε）;y（0，ε）=y（1，ε）=0；0＜ε《1；其中J=（t，ε）＋（t，s，y（s，ε），ε）ds，α=1或t。首先利用边界层函数法构造了这个问题解关于的形成渐近展开，然后证明该问题解的局部存在唯一性以及所构造渐近级数的一致有效性。     

Boltzmann方程渐近解的熵

1976年,Krook与Wu在微分横截面积σ与相对速度g的负3次幂成正比的情况下,得到了三维非线性Boltzmann方程的渐近解。不久前,我们把这种渐近解由三维推广到任意维数d。本文是上文的继续,我们求出了d维渐近解的熵,并研究了它的性质。     

四边简支厚板的三维弹性分析

将三维矩形板的位移变量按双三角级数展开 ,导出位移形式的平衡方程 ,以 3个位移分量及其一阶导数为状态变量 ,建立状态方程 .考虑四边简支边界条件 ,得到了四边简支正交各向异性三维矩形板的精确解 .由给出的均布载荷下的不同厚跨比及不同长宽比的矩形板计算结果可知 ,与已有的理论解以及有限元计算结果非常吻合 ,且级数收敛速度很快     

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.     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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。     

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.