铁路通信信号的地位和作用

本文通过纵观我国铁路发展史和对铁路运输现状的分析,用事实说明了通信信号以其投资少、见效快、效益高、贡献大的特点,在以扩能与安全为中心的铁路运输发展和实现铁路现代化进程中,其地位与作用越来越突出,从而阐明了把以通信信号为主体的铁路信息技术作为重要技术领域来发展,是促进我国铁路现代化的一项重大决策.     

铁路运输模拟系统的现状与发展

回顾了铁路运输系统模拟的发展现状和发展趋势,简要分析并评述了几个国外常用的铁路仿真系统的特点、主要功能和应用领域,探讨了铁路模拟研究中常用的模糊集理论与多智能体技术.并从我国铁路运输的实践出发,分析了铁路模拟器的基本结构和一些关键技术及其在铁路运输研究中的应用,包括加强基础数据收集、注重专业知识与计算机技巧的集成、加强可持续模拟框架的论证、注意软件测试以及模拟系统在应用过程中的技术积累等问题.     

基于降低铁路运输成本的铁路物流优化管理

降低铁路运输成本,是提高铁路运输效益、促进铁路运输发展的重要途径。降低铁路运输成本,必须加强铁路物流管理,切实提高铁路企业物流管理水平。针对铁路物流管理部门遇到的这一难题,本文重点探讨了降低铁路物流成本的策略和方法。     

浅谈GSM-R铁路通信网络

本文结合GSM-R铁路通信网络的系统结构以及在铁路运输中的应用。简要介绍了GSM-R铁路通信网络在铁路运输中的重要作用和发展前景。     

大准铁路非正常行车组织分析

随着神华铁路现代化发展战略的实施,铁路运输管理体制发生了很大的变革,新设备、新工艺、新技术、新材料和现代化管理手段在铁路运输生产中得到了广泛的应用。特别是新一代列车调度指挥系统、调度集中设备和列车控制系统的运用,一种全新的行车组织模式呈现在铁路行车人员面前。     

高铁GSM-R在人员机具管理系统中的应用

目前,铁路已经成为人们日常交通出行的主要方式之一。伴随科学技术的不断进步与发展,越来越多的先进信息技术被应用于铁路运输中,铁路通信呈现出了越来越高的安全性,深受广大乘客们的青睐。其中,GSM-R作为一种先进的信息技术,能够为铁路运输管理提供可靠的无线数据支持,进而增强了铁路通信的灵敏性、有效性、安全性。该文首先阐述了GSM-R技术的概念以及功能,然后分析了GSM-R技术的优势,最后探讨了GSM-R在人员机具管理系统中的应用,希望该研究能够为相关领域人士提供一定的借鉴。     

试论铁路运输的标准化与信息化

在我国中长途运输中,铁路运输扮演着重要的角色,是非常重要的一种运输方式。社会经济的发展在一定程度上带动了铁路运输业的发展,同时对于铁路运输也提出了新的要求。当前,铁路运输体系还不够健全,存在着一定的问题,在一定程度上影响了铁路运输业长足稳定的发展。因此,想要推动铁路运输业朝着另一个层次发展,关键在于能够实现铁路运输的标准化和信息化,能够提高运输的综合能力。该文在对于铁路运输当前存在的问题进行简要分析的基础上,就铁路运输的标准化和信息化提出了建议。     

装卸工作在铁路运输中的定位分析

从装卸工作是铁路实现跨越式发展的基础、装卸工作是铁路运输生产的重要环节、铁路装卸是铁路运输主业的有力支撑3个方面论述了装卸工作在铁路运输工作中的重要作用。     

数字调度通信技术在铁路专用线通信网中的应用

数字专用调度通信系统作为铁路运输调度的主要技术手段，一直广泛应用于铁路调度，保证铁路运输的安全、正点，起着十分重要的作用。本问介绍了铁路专用通信系统的分类、组成、功能、特点和使用现状，论述了数字调度通信系统在宁东铁路公司铁路通信网中的应用。     

铁路管理体制改革的两个关键问题

在计划经济模式下形成的高度集中统一的管理体制 ,对我国铁路系统曾经发挥过一定的作用 ,但是随着我国逐渐由计划经济转向社会主义市场经济 ,铁路传统体制逐渐显现出与改革发展的不相适应。最突出的一点就是政企不分 ,铁路运输企业没有与政府主管部门脱钩 ,在我国国民经济管理体系中 ,铁道部是传统产业部门中仅有的几个至今还在直管企业的部门之一 ;其次是铁路运输领域的垄断经营尚未打破 ,尽管存在外部替代性竞争 ,但在铁路运输行业内部缺乏竞争。显然 ,铁路必须加快推进体制改革的步伐 ,尽快解决制约铁路发展的深层次体制性弊端和结构性矛…     

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。     

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.     

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.