南方单基站CORS在校园平面控制网中的应用

为深入了解中国南方单基站CORS系统的工作原理与测量精度,解决测绘及相关专业学生及科研工程项目采用该系统进行外业测量数据采集的问题,在校园测量实习基地,使用南方单基站CORS系统,设计两种不同的作业方案,与静态GPS数据处理的结果进行比对分析。精度统计表明:中国南方单基站CORS系统进行平面点位测量达到了校园控制的精度要求。为后续利用该系统进行校园实习基地平面控制网改造及科研项目外业测量做了有益的尝试和技术准备,具有一定的实用价值和参考意义。     

南方单基站CORS在校内控制测量中的应用

连续运行卫星定位系统(CORS)与传统的GPS定位相比,具有操作简单、成本低、精度高、实时性强、覆盖率广等优点,特别是CORS内网络RTK测量功能的实现,极大地提高了测量工作效率.利用南方CORS系统,获取了校园建设和实习控制点的坐标,并且通过GPS静态定位结果和RTK测量结果对比分析,发现南方单基站CORS获取的平面坐标精度达到了校园控制测量的要求,可为后续学校的操场建设和校内实习测量以及科研项目的外业数据采集提供有力的技术支持.     

CORS系统加密控制点在地铁GPS控制网测量中的应用

连续运行参考站系统(CORS)是一个或若干个固定的、连续运行的GNSS参考站,它将尖端科技领域的卫星定位技术和地理信息技术、通信技术、先进的软件开发技术有机地结合在一起,为用户提供全新、透明、可视、实时的测量服务。目前,在我国许多省、市都已经建立了CORS站,其被广泛地应用在多个领域。在城市地铁的修建过程中,市区原有平面控制点往往无法满足地铁GPS控制网布设的要求。文章以杭州地铁某标段作为实验对象,采用CORS系统加密平面控制点,同时分析加密控制点与既有控制点之间的兼容性,然后利用加密控制点进行二维约束平差,论证将CORS系统加密的控制点用于地铁控制网起算点的可行性。     

CORS 系统在农村集体土地所用权确权中的应用

随着全球卫星定位系统GPS技术的飞速发展和应用普及,它在测绘领域中的作用越来越重要。一种新的GPS技术,利用多基站网络RTK技术建立的连续运行卫星定位服务综合系统CORS已成为GPS应用发展的新趋势。为使CORS系统的先进测量手段在农村集体土地确权登记发证项目中得到充分应用,通过实验结合不同规范要求。总结了CORS在界址点测量中的应用,分析了测量精度,并提出了CORS测量的优势。结果表明,使用CORS进行农村集体土地所有权界址点测量可以满足精度要求,并能明显提高工作效率。     

GPS测量在桥梁控制网测设中的应用

GPS相对定位技术已经在测绘、交通、城建、国土资源管理等各个领域得到了广泛的应用。它的平面相对定位精度已经完全能够满足工程的需要。结合GPS定位测的各种优点,将GPS相对定位技术引入桥梁控制网的测量和基础放样,无论对GPS技术本身的发展还是对桥梁测量控制都具有极为重要的意义。主要就GPS技术在桥梁测量控制的应用进行了论述。从GPS基本原理出发,论述了控制网的布设、特别对桥梁控制网设计、选点、布设以及精度分析做了详细的论述。并结合张肃项目大桥GPS控制网控制测量和基础放样的实例,对GPS在桥梁测量控制中的应用进行了分析,得到了GPS相对定位技术完全能够应用于桥梁平面控制网和GPS RTK技术满足桥梁基础放样精度要求的结论。     

GPS控制网设计在水利工程控制测量中的应用分析

在水利工程的建设过程中,工程测量是最重要的工作形式之一,其测量技术方法的选择非常重要。随着测量技术的不断发展,传统的测量技术已经不能够满足水利工程的建设需要,取而代之的是GPS测量技术。在GPS的测量过程中,GPS控制网的设计形态对于提高水利工程测量的精度和质量具有重要的影响。主要介绍了GPS控制网设计的基本原理以及水利工程GPS控制网设计的基本内容,重点分析了GPS控制网设计的网形特点,探讨了其在水利工程测量中的优缺点,希望对相关工作者有所指导和帮助。     

GPS在控制测量中的研究与应用

从网形设计原则、勘测选点要求、建立GPS控制网、GPS控制网施测、GPS施测精度控制等方面,阐述了GPS在控制测量中研究与应用.     

苏州三维GNSS CORS高程精度检测与分析

SZ-GNSS CORS是苏州市重要城市基础设施,其中的高程基准是其重要研究内容。通过选取苏州GNSS控制网中的检测点,对这些检测点分别进行精密水准测量、静态GPS观测和GPS RTK观测,对观测数据进行处理和对比分析。结果表明,SZ-GNSS CORS的精化大地水准面模型效果良好,在一般情况下用GPS水准可以替代普通传统水准测量,能够满足苏州城市建设和信息化建设对高程基准的需求。     

GPS定位在房产测量中的应用

结合房产测量的特点和房产平面控制网的精度要求 ,分析了 GPS定位用于房产测量的可行性 ,认为 GPS测量能满足最高等级房产控制网的要求 ,并提出适宜采用的 GPS房产控制网的布设形式。从房产测量的实际要求出发 ,讨论了各种GPS测量作业模式对房产测量的适用性 ,着重介绍 RTK测量的特点 ,指明该技术在房产测量中的应用前景。最后总结了房产测量采用 GPS技术的的优越性。     

GPS地籍控制网的建立

本文研究的是GPS在地籍控制网中的应用。在地籍控制测量中,GPS技术的运用已比较成熟。针对地籍测量的要求,从经济、精度、时间方面探讨了GPS地籍控制测量的技术问题,提出了切实可行的技术方案。GPS是地籍测绘中的重要技术手段之一。本文讲述了建立GPS地籍控制网的基本步骤。     

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.     

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.     

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.     

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.     

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.     

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that