烷烃沸点和其分子结构图的关系

分析烷烃沸点和其结构的关系,导出求算烷烃沸点的经验公式lgT=0.1707lg(w+3△p-m)+2.2677式中,w,p为Wiener指数,m为ω—CH_3数。     

高阶摄动波动方程解的L^p—L^p′估计

研究了高阶摄动波动方程 ttu+ (-Δ) mu+V(x)u =0 ,u(x ,0 ) =0 , tu(x ,0 ) =f(x) ,x ∈Rn,n >3m ,解的Lp -Lp′ 估计 在摄动和始值 f(x)为紧支且V(x)充分小的假定下 ,得到了该问题解的Lp-Lp′ 估计 :‖u(· ,t)‖p′ ≤Ct-d‖f‖p,t >0 ,其中m >1,d =n/m (1/p- 1/p′) - 1,1/p+ 1/p′=1,m /(2n) <1/p- 1/2 相似文献   

一类含有调和数的同余式（英文）

该文目的是创建一系列含有调和数的同余式.当p3为一素数时,利用已有的组合恒等式和同余式,得到了如下的同余式:∑p-1k=1k~2H_k~2≡79/108p-4/9(mod p~2)和∑p-1k=1H_k~3≡23/18(mod p).同时也得到了∑(p-1)/2k=1H_k~2/k≡-8/3q_p~3(2)+1/6B(p-3)(mod p)和∑(p-1)/2k=1H_(2k)~2≡-1+1/2q_p~2(2)(mod p),这里Bn(n∈N)称为Bernoulli数,当pa时,q_p(a)=(a~(p-1)-1)/p称为Fermat商.     

高阶摄动波动方程解的Lp-Lp′估计（英文）

研究了高阶摄动波动方程ttu+(-Δ)mu+V(x)u=0,u(x,0)=0,tu(x,0)=f(x),x∈Rn,n>3m,解的Lp-Lp′估计.在摄动和始值f(x)为紧支且V(x)充分小的假定下,得到了该问题解的Lp-Lp′估计:‖u(*,t)‖p′≤Ct-d‖f‖p,t>0,其中 m>1,d=n/m(1/p-1/p′)-1,1/p+1/p′=1,m/(2n)<1/p-1/2相似文献   

从任意2n—1个整数中必可选出n个使其和为n之倍数

柯召、孙琦提出了如文题所述的猜测.单墫证明了这一猜测.本文的目的是用初等方法证明这一猜测.定理1.p 为素数,从任给2p-1个整数中必可选出 p 个使其和为 p 之倍数.证:任给2p-1个整数 a_1,a_2,…,a_2p-1.从中选出 p 个作和.共有 C_(2p-1)~p=C_(2p-1)~(p-1)个和:S_1=a_1+a_2+…+a_p,S_2=a_1+a_2+…+a_(p-)+a_(p+1)     

醛酮的沸点及其分子结构图

从分子醛、酮的分子结构入手，导出了醛、酮的沸点与其发子结构的关系：1gT=0.13241lg(W 2p 2n-2α-1.5ω）＋2.3729式中T为一元脂肪族醛、酮的沸点（K）；W为Wiener径为指数；p=P-P′，P，P′分别为醛、酮及其同碳原子数的直链醛、酮的极性指数；n等羰碳原子上的烷 基数减1；α等于碳原子上的烷基数减1；ω为ω碳原子上的取代基数。     

应用通项公式探索法数列之和

通项公式a_n=f(n)在特殊数列求和中有着很重要作用,利用它求某些特殊数列之和,往往事半功倍。 如:S_n=1+(1+2)+(1+2+3)+…+(1+2+3+…+n) a_n=1+2+3+…+n=(n(n+1))/2=n~2/2+n/2 相加得: S_n=1/2(1~2+2~2+3~2…+n~2)+1/2(1+2+3+…+n), 当然S′_n=1~2+2~2+…+n~2=1/6n(n+1)(2n+1) S_n=1/2·1/6n(n+1)(2n+1)+1/2·n(n+1)/2=1/12n(n+1)(2n+1+3)=1/12n(n+1)(2n+4)=1/6n(n+1)(n+2) 再如:S_n=1+1/(1+2)+1/(1+2+3)+…+1/(1+2+3+…+n)     

默森尼质数的判别法及其构造

得到默森尼 (Mersenne)数为质数的判别法和构造 ,当Mp=2 p- 1为合数时其因数的特征及其因数个数的估计。(1)Mp=2 p- 1为质数的充要条件是 Mp2kp + 1≡ 0　 (mod p)(2 )如果Mp=2 p- 1且Qi|Mp　i=1,2 ,……T那么 12     

关于丢番图方程x~3±27=py~2

利用初等方法得出了:p=3(3k+1)(3k+2)+1(k≡1,2(mod4))为奇素数时,丢番图方程x3+27=py2无正整数解;p=3k(k+1)+1≡1(mod8)(n≡k(mod 13))为奇素数时,丢番图方程x3-27=py2无正整数解.     

在RN上的拟线性椭圆型方程正解的存在性

研究了以下非线性Dirichlet问题在一定条件下的弱正解的存在性-div(|(△)u|p-2(△)u)+a(x)up-1=h(x)uq+up*-1,x∈RN,u≥0,u0,∫RN?a(x)*|u|pdx＜+∞.其中,aRN→R是连续非负函数,hRN→R是某类可积函数,2≤p＜N且p2≤N,0＜q＜(p2(p-1))/(N-p)-1,p*=(Np)/(N-p).从而在更弱的条件下将p=2或次临界指数的情形推广到P-Laplacian及临界指数的情形,同时推广了a(x)=0时的某些结果.     

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.