鞅差误差下简单线性EV回归模型最小二乘估计的相合性

研究了误差为鞅差序列条件下的线性EV(errors-in-variables)回归模型.利用最小二乘估计方法对模型中β和θ进行估计,证明了估计量的强相合性和均方相合性,从而推广了线性EV回归模型已有的相关结论.     

回归函数的变点分析

本文介绍了变点问题以及线性模型、半参数模型和非参数模型。在已有结论的启发下,给出了非参数模型中回归函数变点或不连续点的位置的估计量,证明了误差具有某种长程相依结构时,回归函数变点位置估计及其分布的大样本性质。在一定的条件下证明了估计量的收敛速度和极限分布。同时在误差具有不同相依结构下,对回归函数变点的位置进行模拟分析;也模拟分析了不同的核函数和带宽对变点估计的影响。     

函数型部分线性回归模型参数估计的注记

本文进一步研究了函数型部分线性回归模型中的参数估计问题,在模型中的随机误差项具有一定相关性的条件下,构造了模型中未知参数向量的估计量并且建立了估计量的渐近性质,如参数向量估计量的相合性及函数型参数估计量的收敛速度,并推广了现有文献中的相关结果,同时也构造了模型中误差协方差阵参数的估计量。     

基于改进进化策略的线性参数估计方法

针对线性回归模型,在最小二乘意义下,提出一种基于改进进化策略的线性参数估计方法并用仿真实例检验其有效性.该方法是将进化策略与最小二乘法相结合并且对算法中的变异算子作了相应改进.算法参数估计精度较高,收敛速度快,自适应性强,能有效处理线性回归参数估计问题.     

带有双误差项线性回归模型的鲁棒参数估计

一般的参数估计往往对分布的偏差很敏感,对于带有一个误差项的系统,鲁棒参数估计方法能较好地解决这一问题.这里基于极小极大方法,给出了带有两个误差项线性回归模型的鲁棒参数估计.     

线性等式约束下线性回归模型参数估计的局部影响评价

本文研究线性回归模型在线性等式约束下参数估计的局部影响评价问题，导出了线性等式约束下线性回归模型在各种扰动模式下参数估计的局部影响度量，通过实例分析，表明了本文方法的有效性。     

线性过程误差方差的相合估计

对于固定设计和线性过程误差下的非参数回归模型,为了估计误差方差,首先基于多项式样条方法给出了回归函数的估计,然后根据所得残差序列构造了误差方差的点估计,在没有混合相依的一般条件下证明了该估计的相合性.此外,还通过算例进行了数值模拟,结果显示,该估计方法可行,同时在误差方差估计的绝对误差意义下,自动选择结点的BIC准则优于AIC准则,基于BIC准则选择结点的样条方法还优于基于交错鉴定法选择带宽的局部线性方法.     

模糊线性回归模型的参数估计

对观测值为梯形模糊数的线性回归模型，通过一个适当的距离利用最小二乘法讨论参数估计的存在性。对于一元线性回归得到参数估计的解析表达式，对多元线性回归的参数估计转化为二次规划问题。文中例子说明了模型的适用性。     

φ混合误差下EV回归模型中估计量的渐近性质

考虑EV回归模型:yi=θ+xiβ+ei,ξi=xi+ui, i=1,2,…,n,n≥1.在φ混合误差下研究EV回归模型中最小二乘估计量的渐近性质,建立估计量的强相合性和矩相合性.所得结果推广了独立变量的相应结果.     

污染线性模型的相合估计

讨论二种类型的污染回归,一是（I）型污染回归模型,并不假定误差分布为正态,也不假定误差方差为已知,只假定误差有三阶矩,在此条件下证明了污染系数及回归系数的参数估计的紧相合性,二是提出一种新的污染回归模型（Ⅲ）,在只假定误差有二阶矩（并不假字有已知方差）的条件下,得到污染系数及回归系数的参数估计的相合性。     

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.