二项式系数幂和序列在模p下的周期性

目的探讨二项式系数的幂和序列an(r,s)=∑nk=0nkrn+kks在modp下的同余性质。方法同余理论。结果①akp+t(r,s)≡ak(r,s)·at(r,s)(modp);②当2|(r+s)时,akp-t(r,s)≡ak-1(r,s)at-1(s,r)(modp)。结论为研究序列an(r,s)的多项式递推公式提供了有力工具。     

图的某些[r,s,t]-染色的色数

证明了(1)若图G是二部图,则当r≥s(χ’(G)-1)+2时,χr,s,1(G)=χr,0,0(G);(2)若图G是非二部图,则当r≥sχ’(G)/χ(G)-s+1且r不是s的倍数时,χr,s,1(G)=χr,0,0(G);(3)当Δ(G)≥2,χ’(G)=Δ(G),且s≥2r,r≥2t时,χr,s,t(G)=χ0,s,0(G);(4)当χ’(G)=Δ(G)+1且s-t≥r≥t时,χr,s,t(G)=χ0,s,0(G)。     

伪Fibonacci数列及其推广

探讨了由非齐次线性递推关系gn+2=gn+1+gn+Atn,n≥0,A≠0且t≠0所定义的数列{gn}的一些基本性质;利用Elmore技巧和{gn}的指数生成函数推广了{gn},得到一个新的序列Gn(x),并证明了Gn(x)满足线性递推关系Gn+2=Gn+1+Gn+Atnext;最后,利用广义三角函数和新定义的序列{Qn(x)}再次扩展了序列{Gn(x)},给出并证明了它所满足的递推关系.     

Fibonacci数列与递推关系

定义1 给定一个数的序列 H_0,H_1,…,H_n,…若存在整数 n_0,使当 n≥n_0 时,可以用等号(或大于号、小于号)将 H_n 与其前面的某些项 H_n(0≤i相似文献   

线性递推序列的幂

本文对a1,…,am∈c,am≠0和满足递推关系un=a1un-1 … a mun-m, n≥m,的序列{un}∞n=0给出递推关系ukn=b1uk/n-1 … bmuk/m-m, n≥m的系数b1,…bm的递推公式,其中k∈z,m=[m k-1/k].     

用有限局部环Z/2kZ上m阶斜对称矩阵构作的卡氏验证码

设R=Z/ 2kZ(k＞1),Wm(R)(m=2v 2≥4)是R上所有m阶斜对称矩阵构成的集合,WmA(R,Hr1r2)={A∈Wm(R)|PAP'=Hr1r2}是Wm(R)中一切与Hr1r2合同的斜对称矩阵构成的集合,令F=∪0≤r1＜r2≤k-1WmA(R,Hr1r2),其中Hr1r2=Dr1(◎)Δr2,Dr1=02-r1I(v)-2-r1I(v)0,Δr2=2-k-12-r2-2-r20-,v≥1,0≤r1＜r2≤k-1.利用F中矩阵构作一个Cartesian验证码,计算其全部参数.     

三阶非线性差分方程的振动性

利用分析方法研究了三阶非线性差分方程Δ[bnΔ(anΔxn)]+qnf(xσ(n))=0,n≥n0的振动性,并举例说明.     

一类二阶非线性时滞差分方程的振动性

利用分析技巧,结合Riccati变换,研究了方程Δ[(xn+anxn-τ)kΔ(xn+anxn-τ)k]+bnf(xn-σ)=0,n≥n0在系数an,bn满足不同条件下的振动性,并举例说明.     

二阶非线性差分方程的振动性定理

给出了二阶非线性时滞差分方程Δ(anΔyn) pnΔyn qn 1f(yn 1)=0,n=0,1,2,…和Δ(anΔyn) pnΔyn qn 1f(yσ(n 1))=0,n=0,1,2,…的振动性的新的判定准则,补充了某些已有振动准则.     

用转化思想解题例说

用“转化”思想解题，可以化繁为简，化难为易。把“转化”思想融合于平时的教学，经常性地引导学生用“转化’思想解决问题，可以大大提高学生分析问题和解决问题的能力。下面例说几种常见的‘“转化”问题。一、陌生问题熟悉化：例1已知数列｛an｝中，a1=5，当n≥2时，an=2a_(n-1)＋3，求an。分析：这是一个给定数列递推关系，求数列的通项公式的题目。我们可以从“陌生问题熟悉化”的角度，由递推公式的结构特征，‘“转化”为等差等比关系求解。解法1：显然an一Zan．．；＋3总可转化为an＋r一2（a；。－－l＋r）的形式，即an一Zan』＿…     

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.