简单半序约束下,估计位置参数的一个非参方法

对k个总体,本文讨论其位置参数被简单半序约束时的估计问题。把单个总体位置参数的H-L估计应用到多个总体的情况,定义了加权保序H-L估计,给出算法及性质。并且用Monte-Carlo方法模拟比较k=2时,L1保序回归与加权保序H-L估计产生的似然函数的大小。     

NA 样本下非对称损失函数截尾参数的经验Bayes检验

研究了负相关(NA)样本下具有非对称损失函数单边截尾参数的经验Bayes检验.其损失函数为L(θ,θ0 )=k1 (θ-θ0 )2I(θ＜θ0 ) [k1 (θ- θ0 )2 k2 (θ- θ0 )] I(θ≥θ0 ),ki≥0,i = 1,2.应用概率密度函数的核估计来构造检验函数,得到了它的收敛速率具有渐近最优性. 并发现对所提出的EB检验,在某些条件下,具有渐近最优性的收敛速率,能够任意接近于1.     

一般损失下K近邻予测后验风险的估计

设(X_1,θ_1),…,(X_2,θ_2),(X,θ)是iid,(d+1)维随机向量,_n~(k)是θ的基于训练样本Z~n={(X_1,θ_1),…,(X_n,θ_n)}及当前样本X的K-NN予测,而L_n~(k)=E{L(θ,_n~(k))|Z~n}是在一般损失函数L下当Z~n给定时的条件风险。该文给出了L_n~(K)的一个估计_n~(k),并证明了,如果θ有界,X无原子且L连续时,有P{|_n~(k)-R~(k)|≥ε}=O(e~(-bn),其中b∈(0,∞)不依赖于n,R~(k)是某一常数.     

关于一些Hermite-Fejer算子逼近度的注记

本文研究以Jacobi多项式的J_n(x)=sin(2n+1)/2θ/sinθ/2(x=cosθ,0≤θ≤π)的零点为基点的Hermite-Fejer插值过程H_(2n-1)(f,x).对于Lipα(0<α<1)类中函数,改进了[1]的结果:得到了H_(2n-1)(f,x)逼近有界变差函数的阶估计. 设函数f(x)∈C〔-1,1〕,x=cosθ(0≤θ≤π),J_n(x)是n阶Jacobi多项式,x_k=x_k~(n)=cosθk=cos(2kπ)/(2n+1)(k=1,2,…,n)是J_n(x)的零点,以{x_1,x_2,…,x_n}为基点的Hermite-Fejer插值算子是(见文〔1〕(4))     

优比简单半序约束下的最大似然估计

优比在列联表中是一个很重要的概念,其在序约束下的估计问题有着较强的现实意义.该文讨论了k张2×2表优比简单半序约束下期望频数的最大似然估计问题,给出了求最大似然估计的一种迭代算法,并证明了此算法的收敛性.     

指数型分布族中矩估计的序贯置信区间

在矩估计的基础上,对于给定精度(2d)及置信系数(α),建立了对参数(θ)函数g(θ)的一个序贯置信区间估计的步骤和方法.并讨论了在一定条件下,当d→0时,估计的渐近相合性、渐近有效性及有界的最优费用差(EN(d)?n(d))等渐近性质.     

锥序约束下两个指数总体均值的估计

讨论样本容量相等时 ,在锥序约束 a1λ1≤λ2 ≤a2 λ1条件下 ,两个指数总体均值 λi( i=1 ,2 )的估计量 .证明约束极大似然估计 λi 具有比经典极大似然估计 Xi 更小的均方误差 ,并且讨论 λi 对 Xi的功效 e( λi,Xi) ,i=1 ,2 .     

序约束下最大似然估计的迭代算法

本文讨论了 k2× 2表相对风险简单半序约束下期望频数的最大似然估计问题 ,给出了求最大似然估计的一种迭代算法 ,并证明了此算法的收敛性     

判断k-可序哈密顿-连通图的新条件

具有n个顶点的图G(n≥3)是k-可序哈密顿-连通的(k是整数,且2≤k≤n),如果对于G中每一个具有k个不同顶点的可序集合S={v1v2,…,vk},都存在G中的哈密顿路P包含S且不改变其中元素的次序.本文证明了:对于具有n个顶点的图G,u、v是G中任意两个不相邻的顶点,且d(u)+d(v)≥n+1.如果G是「k+1/2﹁-连通的k-可序图,k是整数且2≤k≤n/12,则G是k-可序哈密顿-连通图.     

一类离散分布参数的渐近最优经验Bayes估计

本文考虑一类离散指数分布族参数的多项式在平方损失下的经验Bayes(EB)估计.给定θ当前样本X的条件分布有P_θ(X=x)=p(x|θ)=h(x)β(θ)θ~x,x=0,1……的形状,此处h(x)>0,θ∈Ω={θ:θ>0,h(x)θ~x<∞}假定i)θ的先验分布族G∈,={G:dG<∞}.ii)存在有限常数A 使h~2(x)≤Ah(x-1)h(x 1),对x=1,2,……成立.则θ的k 阶多项式Q_h(θ)=(?)的“自然”BE 估计(定义见(8)式)是渐近最优(a,0)的.     

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.     

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.     

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。     

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to