正定型超曲面上Hamilton闭轨作用积分的估计

给出了R2n中正定型超曲面上Hamilton闭轨的周期与作用积分的下界估计.此类超曲面比星形超曲面更为广泛,因而我们的结果包含了凸超曲面和星形超曲面上现有的相关结论.     

五维空间中相贯形及其可见性问题

目前,在五维空间中超曲面与超曲面相交的投影图还没有进行可见性处理,本文对五维空间中超曲面与超曲面相贯及其相贯形可见性问题进行了深入研究和妥善处理,使其投影图清晰、直观、表达效果好.文中还具体地求解了超曲面与超曲面相贯形的投影,并用微计算机在 xy 绘图仪上绘出了五维空间超曲面与超曲面相贯的投影图.     

Mn(c)×R1中具有三个不同特征值的伪平行类空超曲面

研究了Lorentzian乘积空间M~n(c)×R_1中伪平行类空超曲面,得到超曲面是伪平行的充要条件,证明了伪平行超曲面与H-平行超曲面等价;具有三个不同特征值的伪平行类空超曲面是常角超曲面.     

Mn(c)×R1中具有三个不同特征值的伪平行类空超曲面

研究了Lorentzian乘积空间Mⁿ(c)×R₁中伪平行类空超曲面,得到超曲面是伪平行的充要条件,证明了伪平行超曲面与H-平行超曲面等价;具有三个不同特征值的伪平行类空超曲面是常角超曲面.     

常拟常曲率黎曼流形中具有常数量曲率的紧致超曲面

讨论常拟常曲率黎曼流形中具有常数量曲率的紧致超曲面.在超曲面和单位向量场ξ相切时,得到了关于这类超曲面的一个间隙定理.     

Minkowski空间中给定主曲率函数球型和双曲型旋转超曲面

给出了Minkowski空间En1 1中给定主曲率函数的球型和双曲型旋转超曲面的位置向量场,并通过计算超曲面的主曲率,证明了这类超曲面的存在性.     

R~5中的4阶Willmore旋转超曲面

文章考虑了欧氏空间中的高阶Willmore超曲面,给出欧氏空间R5中4阶Willmore旋转超曲面的微分方程,然后给出R5中一类4阶Willmore旋转超曲面的实例.     

局部对称空间中常平均曲率超曲面的拼挤定理

主要研究局部对称黎曼空间中具有常平均曲率的完备超曲面的拼挤问题.运用关于超曲面的全脐张量的Okumura型不等式及Omori-Yau极值原理,得到了一个关于超曲面的第二基本形式模长平方的拼挤定理.     

中心仿射度量的两类具有常截面曲率的闭凸超曲面

本文主要研究Minkowski空间的Laugwitz猜测.首先给出了参数化超曲面的中心仿射几何的直接描述，在此基础上刻画了Minkowski空间黎曼几何与其单位超球面的中心仿射几何的关系，将Laugwitz猜测等价描述为：闭凸超曲面的中心仿射几何截面曲率为常数必为椭球面的刚性问题.然后建立了超曲面中心仿射几何量与欧氏几何量的联系，由此说明欧氏空间凸超曲面n+1-仿射表面积正是该超曲面的中心仿射体积，进而运用关于仿射表面积的等周不等式及其取得等号的几何条件给出了Schneider定理的新证明.最后研究了Simon 3-形式模长的Laplace在常截面曲率条件下的表达式，应用极大值原理证明了具有常截面曲率且具有平行无迹Tchebychev算子的闭凸超曲面具有消失的Simon 3-形式，再根据结构方程证明了该超曲面为中心在原点的椭球面.     

R~n中具有3个不同主曲率的Laguerre等参超曲面

若超曲面的Laguerre形式为零且Laguerre第二基本形式的特征值(称为Laguerre主曲率)为常数,则称超曲面为Laguerre等参超曲面.对Rn中具有3个不同主曲率的Laguerre等参超曲面进行了研究,得到了相应的分类定理.     

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.     

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.     

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.     

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.