在欧几里得(Euclid)平面上建立对偶原则的一种方法

本文主要就欧氏平面的特征,介绍一种在欧氏平面上建立对偶原则的方法。首先,在欧氏平面上,建立不过原点的直线M;x_0x+y_0y—1=0与点M(x_0,y_0)(?)(0,0)之间的对偶对应。然后根据这种对应阐明初等几何中仅与度量性质有关而本身并无联系的两个命题能够对偶地联系起来。     

混合相交体的对偶仿射均质积分不等式

Lutwark提出对偶仿射均质积分的概念,拓宽了经典的对偶混合体积理论.混合相交体一直是凸几何经典理论的研究对象,这里结合Holder积分不等式和Minkowski 积分不等式建立了对偶仿射均质积分关于混合相交体的对偶Minkowski不等式和对偶Brunn-Minkowski不等式.     

关于(F)型空间的一个几何性质

设M为E中闭集,假如于任何x_0M,恒有y_0∈M,使ρ(x_0,y_0)=ρ(x_0,M),此处则称M具有性质A.例如平面上的任何闭集都具有性貭A.本文的目的就是讨论这个几何性质在抽象空间中的情况.     

在三维Euclid空间建立广义对偶原则的一种方法

本文是文「１」的推广，给出了在三维欧氏空间上建立对偶原则的一种方法，道德将空间中具有广义极坐标的点Ｍ（ｐ，α，β，γ）与不过原点的平面ｍ ｘｃｏｓα＋ｙｃｏｓβ＋ｚｃｏｓγ－ｐ＝ｐ建立对偶对应。     

二次曲线的奇点及过奇点的切线

在平面上,任给二次曲线Γ:F(x,y)≡a_(11)x~2+2a_(12)xy+a_(22)y~2+2a_(12)x+2a_(23)y+a_(33)=0 (1)和一点 M_0(x_0,y_0),则过 M_0的直线 l 的方程可写为x=x_0+Xt,y=y_0+Yt.X:Y 是 l 的方向,-∞相似文献   

二元函数高阶Cauchy中值定理“中间点”的渐近性

研究二元函数高阶Cauchy中值定理"中间点"(x_0+θΔx,y_0+θΔy),当点B(x_0+Δx,y_0+Δy)沿BA连线趋向于点A(x_0,y_0)时的渐近性态,利用比较函数概念,在一定条件下建立了二元函数高阶Cauchy中值定理"中间点"(x_0+θΔx,y_0+θΔy)的几个渐近估计式.     

边故障增广立方体中两条无故障点不交路

文中研究了增广立方体两条点不交路问题,用归纳假设法证明了结论:当n≥3时,令增广立方体A_n中的边故障集|F|_2n-6,设x_0,x_1,y_0,y_1是A_n中任意4个顶点,则在A_n-F中有两条点不交路P_0和P_1,使得V(P_0)∪V(P_1)=V(A_n),其中P_0连接x_0和y_0,P_1连接x_1和y_1.     

欧氏平面、仿射平面和射影平面的比较

本文通过对欧氏平面、仿射平面和射影平面进行比较，同时也对在这三种平面上相应地建立的平面欧氏几何学、平面仿射几何学及平面射影几何进行比较。从而进一步认清了三种平面的内在联系及平面射影几何学，平面仿射几何学对平面欧氏几何学的指导意义。     

边故障3元n立方体中的一对二点不交路覆盖①

针对边故障Q■中一对二点不交路覆盖的问题,利用归纳假设法得到结论:当n≥2,边故障■时,在Q■中任取3个顶点x_0,y_1,y_2,则在Q■-F中有两条内部不交路P_1,P_2,使得V(P_1)∪V(P_2)=V(Q■),这里P_1连接x_0和y_1,P_2连接x_0和y_2,而且边故障■为最优上界.     

混合Cauchy-四次函数方程的Ulam稳定性

给出混合Cauchy-四次函数方程f(x_1+x_2,2y_1+y_2)+f(x_1+x_2,2y_1-y_2)=4f(x_1,y_1+y_2)+4f(x_1,y_1-y_2)+24f(x_1,y_1)-6f(x_1,y_2)+4f(x_2,y1+y_2)+4f(x_2,y_1-y_2)+24f(x_2,y_1)-6f(x_2,y_2)的定义,并得到其一般解,同时,在Banach空间及Non-Archimedean赋范空间上讨论了它的Ulam稳定性。     

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.