中国进出口贸易碳转移排放测算方法分析与评价     

方修琦  王媛  魏本勇  王文琴 《地球科学进展》2011,26(10):1101-1108

目前中国的碳转移排放测算方法有很多,虽然方法不尽相同,但总的结论和计算出的变化趋势类似。造成碳转移量测算结果产生较大差异的原因主要有两方面,一是碳排放强度的测算模型不同,二是对于中国加工贸易转移碳排放的认识不同。测算避免转移排放量时,如果不考虑加工贸易的影响,在某些年份（如2002年）甚至会得到＂中国是碳转移的净进口国...  相似文献   

2010年中国非开挖行业调查     

颜纯文 《岩土钻凿工程》2011,(2):1-3,10

本文分析了中国地质学会非开挖技术专业委员会对2010年我国非开挖行业的调查和统计,主要是水平定向钻机的销售情况和非开挖管道修复与更换方法在管道工程施工中的应用情况,最后总结了2010年我国非开挖行业发展的几个特点。  相似文献   

基于物质流分析的区域循环经济评价指标体系构建——以陕西省榆林市为例   总被引：1，自引：0，他引：1  

徐福军  马俊杰 《地下水》2011,(1):158-159,167

以物流分析为基础,兼顾循环经济的3R原则,利用循环经济发展中涉及的物质流分析指标,以及物质流指标与人、经济、单位投入、产出等外延领域的结合衍生指标构建循环经济评价指标体系,并对各指标作了解释,对数据来源途径做了分析.  相似文献   

Environmental zonation across the Australian arid region based on long-term vegetation dynamics     

E.F. Lawley  M.M. LewisB. Ostendorf 《Journal of Arid Environments》2011,75(6):576-585

Zonation of landscapes is generally based on broad scale biophysical data, field surveys, imagery and expert knowledge. Such zonation represents a static view of the environment and does not reflect dynamics and function. Arid environments are however often highly dynamic, and spatial and temporal patterns may be expressed over long periods of time. These dynamics need to be understood for management. Our aim is to understand the dynamics and functional response of vegetation in the Australian arid zone, and use this to inform and potentially improve the currently employed stratification. Principal component analysis of 25 years of satellite imagery identified underlying factors influencing patterns of arid vegetation growth, and regions of similar long-term response. Dominant factors of variation were identified as the spatial distribution of total vegetation growth, seasonality of growth, magnitude of seasonal variability in growth, and regularity of variation in growth. Additional variation resulted from episodic vegetation growth of limited spatial extent and duration. Classes expressing these functional components were compared with the existing biogeographical regions, revealing agreement in some instances, and in other cases adding information previously not available. The study demonstrates a new approach to Australian landscape zonation that has potential for much wider application.  相似文献   

桂林自动站与人工站相对湿度观测对比分析   总被引：1，自引：0，他引：1  

赵丽英  许嘉玲 《气象研究与应用》2011,32(3):84-85

利用桂林站2004～2005年两年平行观测期间资料进行了差异分析,分析了引起差异的原因。分析结果表明：湿度的缺测率与年粗差率均在允许值范围,个别月份的粗差率〉2％、一致率〈80％、对比差值超出-2％,这将在一定程度上影响气候序列的均一性。  相似文献   

Notes邮件系统管理维护及典型故障分析     

蓝设华  邱奕炜  唐雷 《气象研究与应用》2011,32(3):111-112

从LotusDomino服务器系统的监控、维护、服务器系统重要文件的备份操作及系统优化等方面介绍了Domino服务器的管理维护方法：分析了Domino服务器和notes客户端的典型故障,给出了具体的故障解决思路及方法。  相似文献   

主应力轴旋转情况下土的各向异性研究进展          下载免费PDF全文

董志华  高彦斌 《地震工程学报》2011,33(Z1)

从理论和实验两个方面对国内外主应力轴旋转情况下土的各向异性研究进行了对比和总结,并提出了一些研究建议。指出:在理论方面,应对屈服面方程采用应力分量表示的模型在三维空间里进行屈服面性状的描述,并考虑不同加载方向下屈服面的变化特性以及旋转硬化的问题;而实验方面,则应多以粘性土为研究对象,结合理论进行对加载方向变化时土体屈服面变化特性的实验研究以及旋转硬化规律的实验验证。  相似文献   

A Methodology for Clustering Lakes in Alberta on the basis of Water Quality Parameters     

Tahir Ali Akbar  Quazi K. Hassan  Gopal Achari 《洁净——土壤、空气、水》2011,39(10):916-924

In this study, a methodology for clustering 18 lakes in Alberta, Canada using the data of 19 water quality parameters for a period of 11 years (1988–2002) is presented. The methods consist of (i) principal component analysis (PCA) to determine the dominant water quality parameters, (ii) cluster analysis techniques to develop the characteristics of the clusters, and (iii) pattern‐match lakes to determine the appropriate cluster for each of the lakes. The PCA revealed that three principal components (PCs) were able to explain ～88% of the variability and the dominant water quality parameters were total dissolved solids, total phosphorus, and chlorophyll‐a. We obtained five clusters for the period 1994–1997 by using the dominant parameters with water quality deteriorating as the cluster number increased from 1 to 5. Upon matching cluster patterns with the entire dataset, it was observed that some of the lakes belonged to the same cluster all the time (e.g., cluster 1 for lakes Elkwater, Gregg, and Jarvis; cluster 3 for Sturgeon; cluster 4 for Moonshine; and cluster 5 for Saskatoon), while others changed with time. This methodology could be applied in other regions of the world to identify the most suitable source waters and prioritize their management. It could be helpful to analyze the natural controlling processes, pollution types, impact of seasonal changes and overall quality of source waters. This methodology could be used for monitoring water bodies in a cost effective and efficient way by sampling only less number of dominant parameters instead of using a large set of parameters.  相似文献   

3维GIS技术进展     

朱庆 《测绘软科学研究》2011,9(2):25-27,33

从基本概念、应用需求和技术动态等方面就3维GIS技术的发展与演进进行了简要评述,强调了专业化与大众化两种应用对3维GIS提出的不同挑战。  相似文献   

《内蒙古气象》来稿中常见问题分析     

任晓萌 《内蒙古气象》2011,(6):104-105,118

针对目前科技论文写作出现的问题,选取了《内蒙古气象》2010年第6期到2011年第5期共121篇论文,主要采用记录和统计手段对来稿出现的常见问题进行了分析。分析结果显示,论文写作存在的问题主要集中在论文撰写格式和规范化程度、叙述的合理性、推理的逻辑性、写作的条理性和表达的准确性等方面。  相似文献