浅谈GPS RTK技术在工程测量中的应用

阐述了GPS的构成,介绍了GPS RTK的定位原理及其两种测量模式,分析了GPS系统在工程测量中的应用,指出GPS RTK系统在工程测量应用中有精度高、速度快等特点,旨在推广GPS RTK技术在工程测量中的应用。     

GPS在南水北调隧道控制测量中的应用

近年来随着我国基础设施建设的飞速发展,建设大跨度桥梁与隧道贯通工程也发展很快。采用GPS静态相对定位技术建立桥梁与隧道施工控制网,既能满足工程精度要求,又能提高工效、满足工程进度要求。因此GPS定位技术在桥梁与隧道控制测量中已获得广泛的应用。本文主要介绍了GPS在南水北调隧道控制测量中控制网的布设、施测以及平差和精度统计。     

GPS全球定位系统在公路中线放样中的应用

简要介绍了GPS全球定位系统的组成及RTK定位技术的原理,结合具体工程项目,系统介绍了利用GPS系统进行公路中线放样的方法,并进行了误差分析及精度评定,经实际验证,RTK测量成果质量可信.     

CORS系统在地形测量方面的应用及数据结果分析

结合工程应用,简要论述了GPS基准站网监测系绕(CORS)技术在地形测量中的应用方法,比较了两种动态定位技术测量的不同,提出了如何加强精度、提高工作效率的应对措施,并对数据结果进行分析.     

GPS RTK技术在工程测量中的应用

本文从理论方面较深层次叙述了GPSRTK测量系统的定位原理,对GPS RTK定位的关键技术——坐标参数的求解进行了重点介绍。同时,论文联系生产实际列举了二个RTK测量实例探讨了GPS RTK测量技术在工程中的应用,并根据平差学理论及相关规程、规范对测量精度进行了一定的比较和分析,总结得出RTK测量的误差特性和一些有益的结论和体会。     

GPS RTK技术在地籍测量中的应用

介绍了GPS RTK技术的精度指标和GPS RTK技术的系统配置,通过GPS RTK在地籍测量中的应用,阐述了内外业实际操作的方法和优点,积累地籍测量经验以提高测量精度,推广GPS RTK技术在工程中的应用.     

GPS测量技术在工程测量中的具体应用

GPS测量技术普遍应用于工程测量领域中,测量结果精度高。该系统具有全天候、高精度、定位速度快、布点灵活的优点,形成了在工程测量领域中的GPS测量技术,较好地弥补了传统常规工程测量的不足,极大地促进了工程质量的提高。论文分析了GPS测量技术的工作原理和优势,并介绍了其在工程测量中的应用。     

GPS在房产平面控制测量中的应用初探

本文从房产测绘出发,重点介绍GPS测量技术在房产平面控制测量中的应用实验过程,论述了采用GPS定位技术建立房产测量平面控制网的原则、方法、精度可靠性及技术可行性.     

GPS在水利工程测量中的应用

针对GPS技术已经广泛应用于我国工程测量技术领域的现状,本论文主要对GPS工程测量技术要点进行了分析研究,首先简单分析了GPS工程测量的特点,在此基础上重点探讨了GPS工程测量的技术要点,从测量精度、误差处理技术方面探讨了GPS工程测量技术的应用要点,对于进一步提高GPS的工程测量技术水平和应用水平具有一定借鉴意义。     

网络RTK技术在山区工程测量中的应用

网络RTK技术的出现,弥补了GPS实时差分定位RTK技术的缺点,它能获取实时、高效、满足工程测量精度的控制点三维坐标。山区工程测量的难点是控制点布设和测量,解决方法之一就是采用网络RTK技术。本文通过一宗山区高压走廊竣工验收测量实例及数据的精度统计分析,凸显网络RTK技术在山区工程测量中的优势。     

浅析高速公路工程招投标中的最低评标价法

结合目前高速公路施工项目招投标活动的实际情况,阐述了最低评标价法的概念,归纳了其优点及存在问题,对完善最低评标价法提出几点策略,以期促进招标投标市场更加规范有序。     

Place-Making in Megaprojects in Melbourne

This article analyses state-led place-making practices in Melbourne. The two levels of government that influence planning in Melbourne make much of the city as ‘culturally vibrant’ and ‘creative’, and have incorporated creative city-inspired place-making principles into many layers of the planning system. An examination of the development of two mixed-use megaprojects in central Melbourne reveals however that ideals of culturally engaging public places, and indeed of creative landscapes for middle-class consumption, wither in the face of more basic imperatives for economic development. In these case studies the ‘creative city’, no matter how the idea is interpreted, has little traction either as a set of inclusive place-making principles or as a gentrification strategy. The article concludes that the creative city-inspired place-making objectives in the planning system at both state and local levels are ambiguous in their overall intents and completely unsupported by statutory controls. Such place-making objectives as are realised are the compromised results of the interplay of uncoordinated decisions, delivered at the pleasure of the developer.     

Pathogens in septage in Vietnam

Septage is widely acknowledged as a major source of infectious pathogens while disposal of septage, and the operation and maintenance of septic tanks, is not regulated in many developing countries. Twenty untreated septage and septage sludge samples were taken from Can Tho City, Vietnam to examine their pathogen content, and indicator micro-organisms. Escherichia coli and Enterococcus spp. were detected in all samples, regardless of sludge storage time. Phages were detected in 80% of samples. Salmonella spp. were detected in 70% of the untreated septage and 60% of septage sludge samples. Concentrations of phages and bacteria tested in septage sludge after many years of tank storage were much higher than the expected levels. Helminth ova were present in 95% of untreated septage samples with an average of 450 ova l^− 1, and were detected in all septage sludge samples with an average of 16,000 ova l^− 1. Twelve varieties of helminth ova were identified. More helminth ova varieties in higher concentrations were found in septage than those reported from stool samples. The varieties' frequency ranged from 10% to 50% and Ascaris lumbricoides predominated. Results show that pathogens and indicator micro-organisms, especially helminth ova, accumulate in sludge. Thus helminth ova should be considered when septage sludge is treated and used for agriculture. Proper health protection measures must be applied for people handling septage.     

新时期广东城市化的新特点

新时期广东城市化出现以下特点:知识源导向、城市由单体向群体化发展、产业集群推动、政府主导自上而下的集约化发展、城镇化向城市化转变、由重“数量”发展向重“质量”发展的转变。     

谈城市历史保护规划的误区

由于缺乏起码的历史文化知识,忽视历史文化遗产的保护,错误的决策导致了建设性的破坏,要加强城市保护的教育,培养合格人才。     

浅谈我国工程项目建设成本控制存在的问题

结合目前我国施工企业工程项目成本管理现状,对工程项目成本管理过程中存在的问题进行了较详细的分析,并提出了一些解决问题的办法,以做好项目成本控制工作,进而增强企业经济实力。     

浅谈建筑施工临时用电安全

针对由于建筑施工临时用电安全管理的不完善和不规范操作而导致大量工伤事故频频发生的问题,为消除用电安全隐患,对建筑施工临时用电安全管理进行了归纳和分析,并提出了整改意见,以确保现场人员及电气设备的安全运行。     

Perchlorate exposure in lactating women in an urban community in New Jersey

Perchlorate is most widely known as a solid oxidant for missile and rocket propulsion systems although it is also present as a trace contaminant in some fertilizers. It has been detected in drinking water, fruits, and vegetables throughout New Jersey and most of the United States. At sufficiently high doses, perchlorate interferes with the uptake of iodine into the thyroid and may interfere with the development of the skeletal system and the central nervous system of infants. Therefore, it is important to quantify perchlorate in breast milk to understand potential perchlorate exposure in infants. In this study we measured perchlorate in breast milk, urine, and drinking water collected from 106 lactating mothers from Central New Jersey. Each subject was asked to provide three sets of samples over a 3-month period. The average ± SD perchlorate level in drinking water, breast milk, and urine was 0.168 ± 0.132 ng/mL (n = 253), 6.80 ± 8.76 ng/mL (n = 276), and 3.19 ± 3.64 ng/mL (3.51 ± 6.79 μg/g creatinine) (n = 273), respectively. Urinary perchlorate levels were lower than reference range values for women of reproductive age (5.16 ± 11.33 μg/g creatinine, p = 0.03), likely because of perchlorate secretion in breast milk. Drinking water perchlorate levels were ≤ 1.05 ng/mL and were not positively correlated with either breast milk or urine perchlorate levels. These findings together suggest that drinking water was not the most important perchlorate exposure source for these women. Creatinine-adjusted urine perchlorate levels were strongly correlated with breast milk perchlorate levels (r = 0.626, p = < 0.0005). Breast milk perchlorate levels in this study are consistent with widespread perchlorate exposure in lactating women and thus infants. This suggests that breast milk may be a source of exposure to perchlorate in infants.     

安康市工程施工企业未来几年人才需求调查

为了不断提高工程类专业的办学质量,对安康市区主要施工企业或项目经理部未来几年人才需求状况进行了调查,同时提出相关建议,以期培养更多的该类专业人才,满足施工企业需求。