二阶半线性微分各分方程的奇摄运边值问题

本文研究微分积分方程奇摄动边值问题εｄ＾２ｙ／ｄｔ＾２＝ｇ（ｔ，ｙ，ｊ，ε），ｙ（０，ε）＝ｙ（１，ε）＝０，０〈ε《１，其中Ｊ＝ψ（ｔ，ε）＋∫＾α０Ｋ（ｔ，ｓｙ（ｓ，ε），ε）ｄｓ，ａ＝１或ｔ。首先利用边界层函数法构造了这个问题解关于√ε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。     

某类双参数非线性系统初值问题的双重边界层现象

研究奇摄动双参数非线性系统初值问题εｙ＂＝Ｆ（ｔ,ｙ,／μｙ＇）,ｙ（０,ε,μ）＝Ａ（ε,μ）,ｙ＇（０,ε,μ）＝Ｂ（ε,μ）当ε＝０（μ＾ｋ）,ｋ≥３时的双重边界层现象,通过引进不同量级的伸长变量,得到解的一致有效的渐近展形式。     

Banach空间微分方程初值问题弱解的一个存在性定理

在弱耗散型条件ｌｉｍ／ｈ→０＾－１／ｈ［｜ψ（ｘ－ｙ＋ｈ（ｆ（ｔ，ｘ）－ｆ（ｔ，ｙ）））｜－ψ（ｘ－ｙ）｜］≤ｇ（ｔ，｜ψ（ｘ－ｙ）｜）下给出了Ｂａｎａｃｈ空间常微分方程初值问题弱解的一个存在性定理。     

定常奇异摄动系统的概周期解

本文考虑定常的奇异摄动系统（１．１）ｄｘ／ｄｔ＝ｆ（ｘ，ｙ，ε），εｄｙ／ｄｔ＝ｇ（ｘ，ｙ，ε）及其退化 系统（１．２）ｄｘ／ｄｔ＝ｆ（ｘ，ｙ，０），０＝ｇ（ｘ，ｙ，０）．假设系统（１．２）有一个非常数的概周期解（１．３） ｘ＝ｕ（ｔ），ｕ＝Ｖ（ｔ）．当系统（１．２）关于（１．３）的第一变分方程系恰具有一个广义零特征指 数时，我们在适当的条件下证明了对充分小的ε，系统（１．１）有唯一的概周期解ｘ＝ｘ（ｔ，ε）， ｙ＝ｙ（ｔ，ε）使得当ε→ｏ时，对一切ｔ有｜｜ｘ（ｔ，ε）－ｕ（ｔ）｜｜＋｜｜ｙ（ｔ，ε）－ｖ（ｔ）｜｜→０。 在证明中，我们首先推广了法坐标变换，进而建立指数型二分法，然后把问题化为非定常系统的 相应问题，从而利用Ｋ．Ｗ．Ｃｈａｎｇ［５］的结果加以解决．     

一个变系数热方程的初值问题的局部解的不存在性

本文在空间Ｃ（「ε０,Ｔ」,Ｌ＾ｐ）∩Ｃ＾１（ε０,Ｔ「,Ｌ＾内考虑边值问题 ｛δｕ／δｔ－１／ｔ＾αｕ＝│ｕ│＾ｒ－１ｕ ｔ〉ε０〉０ （１） ｌｉｍｕ ｔ ↓ε０（ｔ,ｘ）＝ψ（ｘ） ｘ∈Ｒ＾ｎ（２）其中γ〉１,ｐ≥１,ε０是一个固定的正数。在Ｌ＾ｐ内ψ（ｘ）≥０且不恒为零,α〉０,我们给出了问题（１）（２）有正解的一个必要条件,并研究了正解的不存在性。     

一类非线性ROBIN问题解的边界层现象

本文讨论了非线性Ｒｏｂｉｎ问题εｙ″＝ｆ（ｔ,ｙ,ｙ′）,ａ〈ｔ〈ｂ,ｙ（ａ,ε）－ｐ１ｙ′（ａ,ε）＝Ａ,ｙ（ｂ,ε）＋ｐ２ｙ′（ｂ,ε）＝Ｂ在ｆｙ′ｙ′≠０的情形下解的边界层现象。     

含两参数的三阶半线性常微分方程边值问题的奇摄动(Ⅰ)

研究含两参数的三阶半线性常微分方程奇摄动边值问题εｙ＋ μｆ（ｘ）ｙ″＋ ｇ（ｘ）ｙ′＝ ｈ（ｘ,ｙ,ε,μ）,ｙ（０） ＝ Ａ（ε,μ） , ｙ′（０） ＝ Ｂ（ε,μ）, ｙ′（１） ＝ Ｃ（ε,μ） ．采用两阶段展开的方法,对（ε／ μ２） →０ （μ→０）的情况构造出形式渐近解,并利用微分不等式理论,证明了解的存在惟一性,同时给出余项的一致有效的估计．     

一类奇摄动三阶时滞微分方程边值问题

在本文中,我们利用微分不等式理论研究下列奇摄动三阶ＲＦＤＥ：εｙ′″（ｔ）＝ｆ（ｔ,ｙ（ｔ）,ｙ（ｔ－τ）,ｙ′（ｔ－τ）,ｙ″（ｔ）,ε）,ｔ∈（０,１）ｙ（ｔ）＝θ（ｔ）,ｔ∈［－τ,０］,ｙ′（０）＝θ′（０）,ｙ′（１）＝Ａ｛的边值问题,证明了解的存在性,并给出了解的有效估计式．     

一类变系数半线性热方程初值问题解的blow—up问题

本文讨论了初值问题｛δｕ／δｔ－１／ｔΔｕ＝ｕ＾ｒ ｔ〉ε０〉０ ｘ≤Ｒ＾ｎ（０．１） ｕ（ε０，ｘ）＝（ｘ） ｘ∈Ｒ＾ｎ（０．２）其中γ≥１，ψ（ｘ）连续有界，且ψ（ｘ）≥０但不恒为零。我们证明了当１／γ－１≥ｎ／２时，初值问题（０．１）（０．２）的非负解必在有限时间ｂｌｏｗ－ｕｐ。即问题（０．１）（０．２）在１／γ－１≥ｎ／２时没有非负的整体解。     

二阶非线性抛物型偏微分方程初边值问题的奇摄动

本文讨论一类二阶非线性抛物型偏微分方程初边值问题的奇摄动解法，设Ｌεｕ＝δｕ／δｔ－〔εΣ↑ｎ↓ｉｊ＝１δｉｊ（ｘ，ｔ）δ＾２ｕ／δｘｉδｘｊ＋Σ↑ｎ↓ｉ＝１ｂｉ（ｘ，ｔ）δｕ／δｘｉ＋Ｃ（ｘ，ｔ，ｕ）〕＝０ ｕ（ｘ，ｔ，ε）│ｔ＝０＝ｕ（ｘ，０，ｔ）＝μ（ｘ，ε），ｘ∈Ｂ↑－ ｕ（ｘ，ｔ，ε）│ｓ＝ｈ（ｘ，ｔ，ε）│ｓ（ｘ，ｔ）∈Ｓ其中ε〉０是小参数，给出了上述问题的解的渐近展开式。利用比较定理     

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。     

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.     

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.