隧道环境的统计物理信道特征参数提取与计算

针对隧道无线信道视距和非视距传输环境下的车对车(V2V)通信系统,提出了一种隧道空间物理信道模型,其移动发射机和移动接收机均处于移动状态,无限数量的散射体随机分布在隧道壁上.从隧道空间物理信道模型开始引入了一种随机参考模型,考虑电磁信号的单点散射传播路径,推导出三维空间域信道特征参数,即空-时-频互相关函数、二维时频互相关函数、时间自相关函数和频率相关函数.此外,根据参考模型设计出一种高效的顺式和(SOC)信道仿真模型,其时间自相关和频率相关函数都和参考模型相符合.在信道模型的基础上,分析了V2V系统中天线数量和信噪比与信道容量的关系.     

一种基于时间相关属性的双时态改进模型

提出了一种改进的双时态关系模型，并给出了模型之上的插入、修改等相关操作. 该模型对时间相关属性和非相关属性明确地加以区分，满足了数据分析工作中时间相关属性针对性的需要，同时，可以加快一般情况下时态数据库的插入和修改的速度，并定义了类似于对象标号的主题标号属性“hostNo”，在一定程度上减少了查询中连接操作出现的频度，提高了效率.     

16,17,18,19,20,21,23O入射全反应截面的系统学研究

文章在前期工作liang et al[1] Ap＜4的轻复杂粒子入射的基础上,对16,17,18,19,20,21,23O入射与各种靶核发生反应的全反应截面进行系统学研究,通过考虑能量相关和原子核质量数相关,获取了一套100 MeV/核子以下不同能量入射的核-核反应全反应截面计算模型.所得模型计算结果不仅与氧入射全反应截面实验数据相符合,同时不改变原来Ap＜4的全反应截面模型的计算结果.     

基于RVM的卫星蓄电池性能退化建模

由于工作环境的特殊性,传统的基于物理退化的建模方法无法建立精确的卫星蓄电池性能退化模型.因此,在卫星蓄电池失效物理分析的基础上,提出了一种基于相关向量机回归的建模方法.介绍了相关向量机的基本原理,详细推导了相关向量机回归建模过程,并结合卫星蓄电池测试数据,进行了实例建模.结果显示,模型具有良好的准确性和稀疏性.     

数字散斑相关方法的全场优化表述

从图像运动估计中的基本假设——灰度不变假设出发,用优化方法建立了基于整幅图像匹配的数字散斑相关方法(也称为数字图像相关方法)求解模型,即全场优化求解模型.从建立的全场求解模型出发可引申出常用的两类数字散斑相关方法的求解思路,即基于离散的子区匹配的数字散斑相关方法求解模型和基于有限元的数字散斑相关方法求解模型.从模型建立及求解分析中可知,位移表征模式是数字散斑相关方法求解模型的关键,不同的位移表征模式可构成不同的数字散斑相关方法求解方法.     

交互式图像检索中的相关反馈技术研究进展

相关反馈是近年来交互式图像检索领域研究的重要方向.首先提出了基于相关反馈的图像检索系统框架,并在此基础上从机器学习的角度分析了相关反馈学习的算法模型、样本获取、分布密度估计,及其在其特定应用背景下的困难和挑战.进而对图像相关反馈技术的研究现状进行调查总结,从聚类和分类两个方面对各种相关反馈算法在基于内容的图像检索中的应用进行了较为深入地研究和比较.最后对相关反馈技术发展趋势进行了展望,指出了该技术与图像语义抽取、用户模型建立以及软计算技术之间存在的密切关系.     

相关产业多目标投入产出分析及计算机支持

本文结合东风集团拟在武汉市建设30万辆小轿车总装基地,从而影响地区相关产业发展这一背景,给出了一个相关产业的多目标投入产出线性规划模型.从市政府的角度,设置了市财政收入、税收和职工工资总数最大,市外调入尽可能小这样两个目标,选用多目标优化的ε-约束法作为求解这一模型的运筹形式.对7个相关产业进行了分析,同时开发了基于这一模型的计算机决策支持系统.     

一种时序数据局部相关对象聚类算法

针对高维时序数据中局部相关模式的聚类问题,建立了一种基于相关子模式的spCluster模型,讨论了该模型与平均平方残值的关系.并以此模型为基础,提出了适用于时序数据的确定性双聚类算法sp-TSC,该算法首先利用spCluster模型将局部相关的数据对象符号化,然后将字符序列插入到泛化后缀树中,利用后缀树的性质避免了穷举局部相关子模式的各种组合,有效减小了搜索空间,从而可以在数据矩阵尺寸的线性时间内发现全部最大δ-spCluster.理论分析和实验表明,该算法是高效可行的.     

结构损伤识别中部分相关噪声模型

详细地讨论了噪声的来源和产生的物理机制,分析了经典不相关噪声模型的物理意义和适用范围,将测试噪声分为与信号大小无关的测试系统基础噪声和与测试信号幅值和相位有关的环境噪声两部分,提出与结构试验实际环境符合的部分相关噪声模型.计算比较了部分相关噪声模型和传统噪声模型下仿真测试信号的信噪比和方差比,并比较了其对结构振型的识别精度和损伤识别定位的影响.结果表明,所提出的部分相关噪声模型较为符合工程测试实际,而传统噪声模型未能有效模拟系统和环境噪声.     

Mobile-to-Mobile地面通信信道统计模型分析

介绍了一种适用于分析城市和郊区移动对移动地面通信信道的统计模型.在分析该模型的基础上,对接收信号包络和相位的概率分布、空时相关函数和复包络的功率谱密度进行了研究.     

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.     

A computer generator for randomly layered structures

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

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。     

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.