一类退化椭圆算子的Harnack不等式

研究了形式如下的一类由H(o)rmander向量场构成的退化椭圆方程∑m i,j=1 X* i(aij(x)Xju+diu)+∑m i=1biXiu+eu=f-∑m i=1Xifi,在方程的低阶项的系数属于退化Morrey空间的假定下,利用加权的Sobolev不等式、退化Morrey空间的加权的嵌入引理和经典的Moser迭代方法,证明了方程的弱解是局部有界的,得到了方程的非负弱解的Harnack不等式,从而得到了方程弱解的H(o)lder连续性.欧氏宅间退化椭圆方程的一些结果被推广到H(o)rmander向量场的情形.     

关于丢番图方程(γΣi=1)αiχi=n的非负解的研究

运用初等方法给出了若qi=(a1,...,ai-1,ai+1,...,ar)(i=1,2,...,r)中至少有一个大于1,则当n=(γΣi=1)αiqi-(γПi=1)qi-(γΣi=1)αi时,丢番图方程(γΣi=1)=n无非负解.     

线性函数方程解的渐近性质

本文研究了线性函数方程 f(x)=sum from n=1 to l a_if(a_ix) h(x) 以及齐次函数方程 f(x)=sum from i=1 to l a_if(a_ix) 解的渐近性质,其中|a_1|<1,i=1、2,…,l。     

具正负系数的多滞量中立型差分方程的振动性

讨论了具正负系数的多滞量中立型差分方程Δ[x(n)-m∑l=1Rl(n)x(n-rl)] w∑i=1Pi(n)x(n-τi)-k∑j=1Qj(n)x(n-σj)=0的振动性.其中:w≥k;Rl,Pi,Qj∈([n0,∞),R );rl,τi,σj都是非负整数,并且关于l,i,j都是单调减的,τi≥σi.在新的条件下得到了该方程振动的充分条件.     

关于方程■

柯召和孙琦在文〔1〕中研究了方程又l XKn ,=1他们给出了这个方程的一些解,并且证明了 定理方程 Kx; n Xi=22 i=1若有X‘>1(i=1,…,K)的整数解,则至少存在一个i(l了i若K) K子皆除尽n Xi j=1 j勺i 我们在这里将改进这一结果,而得到 定理。方程 K xZ n X.=Z i=l使X:的每一个素因(1) XKfl若有X:>1(i=1,…,K)的整数解,则最多只有一个i。(1、,i。/K),使X;。有与i=1i今i。素的因子、:。>1。 为了证明这个定理,需要引用A.Schin:。1的一个引理(见文〔2〕): 引理。若正整数a,,aZ,b:,b,,b,,满足方程 a,a,a,二b,b!b Zb,和条件(a,,b,b,)二(aZ,…     

一类非线性多时滞中立型差分方程的振动性

讨论了非线性多时滞中立型差分方程　　　　Δ(x(n) - p(n)x(n-τ) ) +q(n) ∏mi =1(x(n -σi) ) αisgnx(n-σi) =0的振动性 .其中 :p(n) ≥ 0 ,q(n)≥ 0且不恒等于 0 ;τ ,σi是非负整数 ,i=1,2 ,… ,m ;αi >0 ,∑mi=1αi=1;Δ是前差分算子 ,Δx(n) =x(n+1) -x(n) .采用离散的Riccati变换和某些函数变换 ,利用反证法 ,得出了此方程所有解的若干振动准则 .     

一类中立型差分方程非振动解的存在和渐近性

讨论了非线性多时滞中立型差分方程　　　　Δ(x(n) - p(n)x(n-τ) ) +q(n) ∏mi =1(x(n -σi) ) αisgnx(n-σi) =0的非振动性 .其中 :p(n) ≥ 0 ,q(n)≥ 0且不恒等于 0 ;τ ,σi 是非负整数 ,i=1,2 ,… ,m ;αi >0 ,∑mi =1αi =1;Δ是前差分算子 ,Δx(n) =x(n+1) -x(n) .利用序列及映射的构造得出了方程最终正解的存在条件 ,并且引用以指数形式趋于 0的定义讨论了非振动解的渐近性态 .     

H矩阵和高矩阵的广义逆类

A.Ben-Israel 和 T.N.E.Greville 在他们的著作中,把满足数字矩阵方程AXA=A(1)XAX=X(2)(AX)~*=AX(3)(XA)~*=XA(4)AX=XA(A、X 为方阵)(5)中的方程(i)、(j),…,(l)的矩阵 X 称为 A 的{i,j,…l}逆,记为 A~(i,j,…,l),{i,j,…,l}     

Diophantus方程Σni=0(x+i)2=y2的正整数解(Ⅰ)

探讨Diophantus方程Σni=0(x+i)2=y2在n≤50下的正整数解问题,得到了以下结果:Diophantus方程Σni=0(x+i)2=y2在n≤50下有正整数解的充要条件为n∈{1,10,22,23,25,32,46,48,49}.     

具有连续变量的非线性时滞偏差分方程的振动准则

研究具有连续变量的非线性时滞偏差分方程[αA(x-r,y) bA(x,y-h) cA(x,y)]^k-[kA(x,y)]^k ∑i=1^uPi(x,y)A^k(x σi,y τi)=0获得了方程的一些振动准则。     

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.     

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.     

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.