一带时滞的退化奇异抛物型方程的熄灭

本文考虑了一带时滞的退化奇异抛物型方程的熄灭问题.通过使用正则化方法和上下解技巧,我们得到了该问题存在唯一古典解的结论.并且对q≥0,通过寻找一个特殊的上解和利用特殊特征值问题的第一特征值及其对应的特征函数性质,获得了上述问题解的整体存在和熄灭的充分条件.与此同时,我们还获得了q≥0时解的熄灭时间T和临界长度a*的简单估计.     

一类退化的时滞抛物型方程组的解的熄灭

文章讨论了一类含时滞的退化抛物型方程组的解的熄灭问题,通过运用正则化方法和上下解的技巧,得到了解的存在性并且证明了存在唯一的一个临界长a*，使得当a<a*时,方程组的解全局存在;当a>a*时,方程组的解熄灭.文章还给出了临界长a*的估计值.     

一类具局部化源的快扩散方程解的熄灭

研究一类具局部化源的快扩散方程解的熄灭性质. 通过分析非线性扩散项和非线性源项对解熄灭的影响并借助一些特殊构造的上下解, 得到了该问题解的临界熄灭指标. 结果表明: 当源项指标适当大时, 该问题的解对于适当小的初值在有限时刻熄灭; 当源项指标适当小时, 其最大解不熄灭.     

一端铰支一端固支弹塑性杆的动力屈曲

本文考虑了应力波效应，对弹塑性直杆在轴向阶跃载荷作用下的动力屈曲问题进行了研究，当动力特征参数-1/4α1^4≤λ〈0时，由动力屈曲控制方程非平凡解条件给出会两个参数（屈曲临界载荷和收界长度）的屈曲判据。用matlab求解包含这两个参数的超越方程，给出这一问题的一种数值解，得到了屈曲临界载荷与临界长度的关系，并分析了强化模量对屈曲的影响。     

二维Landau－Lifshitz静态方程组

本文讨论了下述边值问题我们证明了当时，上述问题的极小解存在．当ｎ＝２，ｕ０＝（０，０，１）且当λ≤０时，ｕ＝ｕ０是唯一正则解；当０＜λ≤λ１时，除了ｕ＝ｕ０。是唯一的能量极小解外，还存在一个非常数的解；当λ＞λ１时，ｕ＝ｕ０是一个非极小解，并至少存在两个非常数解．     

电子论运动方程的一个严格解

严格求解了由Moniz和Sharp导出的非相对论经典电子方程．结果表明当电子半径大于一个临界长度时，方程的解表现出良好的性质，不会出现奔离和预加速的现象．这个特定的长度也是对经典电动力学适用范围的一个粗略估计．     

组合幂强化弹塑性-超弹性球体中的空穴生成

研究了组合幂强化弹塑性-超弹性球体在简单加载作用下空穴的生成问题．这里存在一个临界载荷，当外加载荷小于这个临界值时，不管载荷为何值，问题总有一个响应于均匀变形的平凡解；当载荷超过其临界值时，除了平凡解之外，球体内部还有一个空穴突然生成，因此问题有一个分叉解．得到了空穴半径与外加载荷之间的精确关系；数值结果表明，幂强化弹塑性材料参数对空穴生成有明显的影响．     

杆柱在水平井眼中的正弦屈曲

本文通过建立和求解杆（管）柱在水平井眼中的正弦屈曲方程，进一步分析了不同边界条件下，杆柱临界失稳载荷因子β０与杆柱长度因子α０之间的关系．杆柱在水平井眼中的稳定性取决于载荷因子β、长度因子α０及端部的约束条件．当β＜１时，柱杆不会发生失稳．当α０＜３，临界失稳载荷因子β０对边界约束条件较为敏感；当α０＞５时，β０对端部的约束条件不敏感．     

Feller算子下的空间分数阶扩散方程定解问题

讨论了用分数阶Feller算子替换扩散方程中对空间变量二阶偏导数后得到的空间分数阶扩散方程定解问题的求解问题，给出一个求解该类问题的公式．利用该公式及Fourier变换得到问题的解，并当α→2，即θ→0时，问题的解与整数阶扩散方程的解一致．     

带梯度项的热点火模型的数学分析

对带梯度项的热点火模型，应用上下解方法及爆破与熄灭、死核等问题的关系，得到了与不带梯度项时的模型相似的结果．     

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.