盾构机自动导向系统坐标解算及实现效果分析     

黄小斌  方杰  崔福义 《测绘信息与工程》2010,35(6):32-33

分析了日本演算工房盾构机自动导向系统,提出其坐标解算原理,并进行了实现效果分析。  相似文献   

舟山海洋微塑料污染源头治理机制建设初探          下载免费PDF全文

季扬沁  尤仲杰  何力 《海洋开发与管理》2019,36(11):75-81

海洋微塑料污染2004年才被英国科学家发现并提出,至今已经成为世界最受关注的生态环境问题之一。课题组认为公众是海洋微塑料污染的最主要源头。因此课题组立足舟山海域微塑料污染情况,包括塑料垃圾(资源)处理等情况,基于对公众认知的调查问卷,尝试描述以公众为核心、联合各行为主体的海洋微塑料污染源头治理机制,同时提出机制建立条件、困境与未来。此外,课题组关注社区、公益组织和市场的相应行为,力求在未来更为关注政府行为。  相似文献   

高光谱图像滚动引导递归滤波与地物分类     

崔宾阁  吴亚男  钟勇  钟利伟  路燕 《遥感学报》2019,23(3):431-442

高光谱图像类内光谱变化较大,"同物异谱"现象普遍存在。利用原始地物光谱特征进行分类精度较低而且分类结果图中存在"椒盐现象"。为了获得好的分类结果,必须充分利用高光谱图像的光谱信息和空间信息,减少类内的光谱变化,并扩大类别间的光谱差异。为此,提出一种滚动引导递归滤波的高光谱图像光谱—空间分类方法。首先,利用主成分分析对高光谱图像进行降维;然后,利用高斯滤波对输入图像进行模糊化,消除图像中的噪声和小尺度结构;接下来,将模糊化后的图像作为引导图像,对输入图像进行边缘保持递归滤波,输出结果作为新的引导图像,重复迭代这个过程直至大尺度边缘被恢复;最后,利用提取的特征波段和支持向量机对高光谱图像进行分类。在两个真实高光谱数据集上进行了分类实验,结果表明本文方法的分类精度优于其他的高光谱图像分类方法。在训练样本极少的情况下,本文方法也能获得较高的分类精度。  相似文献   

To tax,or not to tax: preferences for climate policy attributes     

Runar Brannlund  Lars Persson 《Climate Policy》2013,13(6):704-721

Many countries around the world respond to global warming and its consequences with various policy instruments. In the economic literature, policy instruments have typically been analysed with respect to efficiency, but little effort has been expended to understand public preferences for these instruments. In an internet-based choice experiment to address this shortcoming, Swedes were asked to choose between two alternative hypothetical policy instruments, each of which reduces CO₂ emissions by the same amount. The hypothetical policy instruments were characterized by a number of specific attributes. By varying the levels of each of the attributes, respondents indirectly reveal their preferences for these attributes. Half of the respondents are faced with choices labelled ‘tax’ and ‘other’, and the other half are faced with unlabelled choices (hypothetical instruments). The results show that Swedes tend to dislike the term ‘tax’ and show a preference for instruments with a positive effect on environment-friendly technology and climate awareness. A progressive-like cost distribution is preferred to a regressive cost distribution, and the private cost is negatively related to the choice of policy.  相似文献   

基于WebGIS的突发事件网络舆情可视化设计与实现     

李杰  赵阳 《测绘信息与工程》2014,(4):38-41

从地理学角度分析网络舆情,将网络舆情映射到地理空间,借助GIS地理可视化及空间分析技术来分析和挖掘网络舆情的时空特性。设计了基于RIA模式架构的分布式突发事件网络舆情WebGIS平台,实现了基于事件的网络舆情时空可视化、专题图制作、空间分析和预测预警等功能,为突发事件应急处置、知识发现提供决策支持。  相似文献   

基于互联网公交调度管理系统的设计与实现     

李飞  孙轩  马春红 《测绘软科学研究》2014,(2):69-73

随着国民经济的发展和城市化进程的推进,城市交通问题日益凸显。在当今数字城市和智慧城市建设的浪潮下,通过互联网和现代IT技术实现城市公交系统的高效管理,提高公共交通的运营效率和社会服务水平,符合现代化大城市发展的必然要求。从设计与实现角度,本文对基于互联网的公交调度管理系统的组成与功能进行了详细介绍。  相似文献   

Unjust and unsustainable: A case study of the Açu port industrial complex     

《Marine Policy》2014

Given their potential for social and ecosystem disruption along with job creation and economic stimulus, the proliferation of extremely large-scale investment projects worldwide has created a dilemma for policymakers and public authorities. Although one method of balancing the varied interests of stakeholders is to require that development projects be sustainable, the definition of this concept has become muddled and few practical frameworks for its implementation have emerged. One strategy that does exist, however, is the just sustainability framework. The present study sought to assess the just sustainability of the Açu industrial seaport megaproject in Rio de Janeiro State, Brazil through the application of a questionnaire among 60 active marine artisan fishers of a nearby community. The results indicate that the megaproject was not sustainable. Furthermore, the results of the just sustainability indicators triangulated both with the study's primary fisher ethnographic data and with peer-reviewed scientific assessments of similar projects, thus confirming the potential value of the just sustainability framework for assessment and policy formulation.  相似文献   

Spatial spillover and the factors influencing public service supply in Sichuan province,China   总被引：2，自引：0，他引：2  

Xue-qian Song  Wei Deng  Ying Liu 《山地科学学报》2014,11(5):1356-1371

This article examines the spatial characteristics of public service supply and the factors influencing such supply in cities of Sichuan Province, China using spatial-autocorrelation and spatial econometric models with statistical data in 2012. The results demonstrate that expenditures on different types of public services present different spatial autocorrelation patterns. Although the spatial differences in basic public service expenditures are relatively small, a clear fan-shaped spillover to the east can be seen in Chengdu City. Chengdu also shows high clustering of advanced public service expenditures, being a typical core-periphery pattern. Post-earthquake reconstruction expenditures are clustered in the ＂5.12 Wenchuan earthquake＂ region and spill over toward cities to the east. The efficiency of public services in the mountainous areas in western Sichuan is low and exhibits a pattern of low-low spatial autocorrelation. The efficiency of public service supply is affected by economic, social, political and geographical factors. Based on the results of this analysis, we recommend a supply strategy that incorporates different types of public services and a specialized public service supply strategy for mountainous areas. Overall public service efficiency should be enhanced by focusing on narrowing the gap in farmers＇ income among regions and accelerating urbanization. Decision-makers should consider moresupportive policies with regard to providing basic public services in mountainous areas to ensure an equalized supply of basic public services. To enhance the efficiency of advanced public service supply, additional growth pole should be encouraged and incentivized; however, investments are required to drive the development of the peripheral regions through regional economic integration. Both software and hardware types of infrastructure are required to supply services efficiently during post-disaster reconstruction.  相似文献   

山东省地层古生物工作研究新进展          下载免费PDF全文

于学峰  杜圣贤  张增奇  刘书才  宋香锁  张尚坤  张义江  杨斌 《山东国土资源》2014,30(3):24-30

地层古生物研究工作对促进基础地质发展,指导矿产勘查等具有十分重要的意义。近年来山东省地质科学研究院通过对全省地层古生物化石研究,在生物地层、年代地层方面取得了重要进展;通过开展全国古生物化石保护工程规划研究、山东省重要古生物化石保护规划研究、胶莱盆地白垩纪脊椎动物化石保护、开发方案与规划研究等,为古生物化石保护、开发规划及其编制提供了科学依据;通过对济南、临沭、诸城、莱阳、临朐、莒南等地质公园古生物化石的调查研究,为地质公园的科学定位、科学研究、科学普及以及地学旅游发展提供了重要的科学指导,对推动社会经济可持续发展起到了支撑作用;通过开展地层古生物研究,为相关的地质找矿工作提供了基础理论依据;通过以上工作,为山东省培养了一批地层古生物人才,建立了一支技术过硬、力量雄厚、结构合理的专家团队。  相似文献   

Obtaining public support for North-South climate funding: Evidence from conjoint experiments in donor countries     

《Global Environmental Change》2014

The adoption of the Warsaw mechanism on loss and damage has again highlighted the North-South divide in those parts of UNFCCC negotiations dealing with international climate finance. Current estimates put required funding from rich countries at 50–100 billion Euros per year to induce non-Annex I countries to take on greenhouse gas limitation commitments and to assist highly vulnerable countries. Results from survey-embedded conjoint experiments can help policy-makers anticipate opportunities and pitfalls in designing large-scale climate funding schemes. We implemented such experiments in the United States and Germany to better understand what institutional design characteristics are likely to garner more public support for climate funding among citizens in key developed countries. We find that climate funding receives more public support if it flows to efficient governments, funding decisions are made jointly by donor and recipient countries, funding is used both for mitigation and adaptation, and other donor countries contribute a large share. Contrary to what one might expect, climate change damage levels, income, and emissions in/of potential recipient countries have no significant effect on public support. These findings suggest that finance mechanisms that focus purely on compensating developing countries, without contributing to the global public good of mitigation, will find it hard to garner public support.  相似文献