一阶非线性时滞中立型差分方程的振动准则

考虑一阶非线性时滞中立型差分方程△（yn-pnyn-p) qnПi=1^m|yn-σi|^αisgnyn-σi=0.n=0,1,2,…得到了方程所有解振动的充要条件及比较定理,取掉了前人工作中的限制条件PN kt≤1,k≥0．     

二阶拟线性时滞差分方程解的振动性与渐近性

研究了二阶线性时滞差分方程△(rn(△xn)^σ) f(n，x(h1(n))，x(h2(n))，…，x(hm(n))=0，n∈N(n0)，（E）其中m≥1，N（n0)={n0，n0 1，n0 2，…}的解的振动性与渐近性．给出了方程(E)的所有解振动与非振动的一些充要条件．     

隐格式组产生迭代序列逼近Lipschitz映像族公共不动点

设K是Banach空间E中非空闭凸集．{Ti}i-1^N是K中具公共不动点集F=∩i-1^NF（Ti）的Lipschitz映像族，其中F（Ti）=（x∈KiTix=x}，{αn}n-1^∞}，{βn}n-1^∞包含[0，1]是实数列，且∑n=1∞（1-αn）〈＋∞，（1-αn）L^2〈1，这里L是{Ti}i=1^N的公共Lipschitz系数．对任意x0∈K，{xn}n-1^∞由文中隐格式组（2）和（3）产生，则（i）{xn}在K中收敛；（ii）{xn}收敛于{Ti）i=1^N公共不动点的充分必要条件是lim d（xn,F）=0．对于（2），如聚βn=0。隐格式组变为xn=αnxn-1＋（1-αn）Tm^2xn,如果βn=1，隐格式组变为Xu与Or1的形式xn=αnxn-1＋（1-αn）Tnxn，对于（3），如果βn=1，隐格式组变为显格式xn=αnxn-1＋（1-αn）Tnxn-1．对于这三种特殊迭代格式，结论（i）（ii）自然成立．     

高阶中立型差分方程非振动解的存在性

得到了下列高阶中立型差分方程的一个非振动性理论,△[rn（△^m-1（xn＋αxn-τ））α]＋α]＋f（n,xn-σ1,xn-σ2,…,xn-σn）=0,n∈N,其中α为正奇数的商,m,u为大于等于2的整数,rn〉0,其中n∈N,α∈R,τ,σ1,σ2都为大于等于0的整数以及f∈C（[n0,∞]×R×R×…×R,R）。     

一类带调和势Schroedinger方程组解的爆破

研究了一类带调和势Schroedinger方程组的初值问题{iФt r△Ф m|x|^2Ф|ψ|^2=a（j 1)|Ф|^j-1|ψ|^k 1Ф,iψt q△ψ n|x|^2ψ|Ф|^2=b(k 1)|ψ|^k-1|Ф|^j 1ψ，Ф（0,x)=Ф0(x),ψ（0,x)=Ф0(x),得出了该初值问题的解在有限时间内的爆破．     

R^N中带冲突非线性项的拟线性椭圆方程的多解性

考虑R^N中含正参数μ的拟线性椭圆方程-div(|↓△u|^p-2↓△u) |u|^p-2u=q(x)|u|^α-2u-μr(x)|u|^β-2u,u∈W^1,p(R^N),其中P：1＜p＜α＜β＜p^*,q∈L^∞（R^N)∩L^β/β-α（R^N),q(x)＞0,r∈L∞(R^N),r(x)≥d＞o。证明了当μ充分大时该方程无非零解,而当μ充分小时该方程有足够多的分别具有正能量与负能量的解。     

一种用小波求信号突变点的三个参数的方法

信号的奇异性和不规则的结构经常带有大量重要的信息，采用db2小波求突变点的位置和3个参数κ，σ，α，对f(t)=1-|0．5-t|^1.1进行了数值计算。     

二阶非线性差分方程的振动性与渐近性质

借助于不动点定理，研究了非线性差分方程△(rng(△xn)) f(n,xn)=0 的渐近性质与振动性质，给出了当∑n=n0^∞g^-1(1/rn)=∞时上述方 程存在非振动解的充要条件，同时还给出了该方程振动的充要条件。     

低维空间中带调和势的非线性Schrodinger方程

研究一维和二维空间中带调和势的非线性Schrodinger方程iψt 1/2△-1/2|x|^2ψ α|ψ|^2ψ b|ψ|^4ψ=0,ψ(0,x)=ψ0,t≥，x∈R^n，α、b为常数。针对非线性项互为排斥的情况，应用Tsutsumi和Zhang(Adv.Math.Sci.Appl.1998,8(2):691-713.)的有关方法，讨论了上述Cauchy问题在一定条件下解的不稳定性质。     

一类时滞差分方程的振动性

研究了一类时滞差分方程xn＋1^2=xn/（1＋αxn-k）的振动性,其中α为正参数,k是正整数,初始条件x-k,…,x0为正数。指出了（k＋1）^k＋）（√1＋4α-1）/（√1＋4α＋1）〉（k/2）^k为该方程振动的充要条件。     

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.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…