关于三维单位球面S~3中曲面的BⅢ－等距

本文讨论了三维单位球面Ｓ３中曲面的ＢⅢ－等距变形，并给出了ＢⅢ－曲面的分类及其几何性质。     

基于X-样条的真实感曲面生成方法

X－样条具有局部控制性，每个控制顶点带有可修控曲线形状的参数，既能逼近控制顶点，又能插值控制顶点（由参数的正负控制）。其参数的选取具有直观性，造型灵活修控方便。从X－样条入手，介绍了X－样条曲面的算法原理，以及以Visual C 6.0为工具，实现基于X－样条的曲面造系统的消隐处理方法及其表面光照的处理过程，并给出了应用实例。     

关于Ⅱ——等距的一个定理

本文首先讨论曲面的位似，然后给出Ⅱ－等距成为Ⅰ－等距的一个充要条件。     

两三角域上Be^—zier曲面片在PPG^n变换下的保凸对接

曲面满足一定光滑性条件的保凸对接在曲面设计、几何造型中有广泛的应用。作者在文中给出了２个曲面片在ＰＰＧ＾ｎ变换下保凸并用Ｂｅ＾－ｚｉｅｒ点表示的条件。     

三维deSitter与anti－deSitter空间中极大与极小抛物旋转曲面及整体稳定性

本文讨论三维ｄｅＳｉｔｔｅｒ与ａｎｔｉ－ｄｅＳｉｔｔｅｒ空间中极大与极小抛物型旋转曲面，给出了完全的分类并证明了类空曲面是整体稳定的。     

水火弯板成形后板表面形状的数学模型

给出了水火弯板成形后板下表面的曲面方程的基本形式．水火弯板的变形场可由成形后板的表面形状及平面内变形全面描述．对于帆形板火焰成形的变形，大量计算结果表明，各种加工条件下板成形后的表面形状是相似的，即曲面可以用同一种曲面方程描述．通过对计算结果的回归分析，得到了此曲面方程的具体形式，并比较了计算和拟合结果．准确性满足工程要求．     

带约束的曲面放缩变形及一个新的目标函数

对解决带约束的曲面放缩变形的fix-and-stretch法提出了一个新的目标函数。该目标函数在导矢叉乘积分的意义下保证了新旧曲面对应的法向变化尽可能小，从而保证了两个曲面的形状和曲率分布尽可能接近。另还对新方法和基于能量模型的方法进行了比较。     

关于H—变形曲面的Gauss映射

本文应用陈省身等人给出的关于H-变形曲面的一些有趣的事实,深入研究了有关H-变形曲面Gouss映射的性质,并应用所得结果证明了H-变形曲面一个有趣的几何特征。     

自由曲面纯组合表示法

分析处理三维空间离散数据Ｐｉ＝｛ｘｉ，ｙｉ，ｚｉ｝形成自由曲面的方法，发现所有方法都公仅与顶点，边，面和它们之间的邻接关系有关，本文给出依于图到Ｚ＾３邻接关系映射有关的自由曲面表示方法－纯组合法，方法的本质是利用数学组合逼近的结果，推出自由曲面许多性质，部分给出实现算法。     

基于物理模型的参数化曲面展开

提出一种基于物理模型的参数化曲面展开方法。对被展曲面进行三角化并将其映射到一个初始二维片上，初始平面映射与已三角化的被展曲面具有相同的拓扑结构；利用已建立起所一个基于物理可变形模型来将三维曲面展开为二维片，在展开的过程中，曲面展开的局部精度很容易控制；然后，采用插值函数及彩色能量颁图来表示弹性变形能量分布，从分布图中找出曲面展开的剪开线，从而能有效解决ＣＡＤ－ＣＡＭ中的曲面展开问题。     

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.