矿井出水水源判别的综合方法

母杜柴登煤矿目前处于基建阶段,在回风巷道施工一个长距离钻孔。该钻孔涌水量一度达到220 m3/h,快速判别此出水来源,成为矿井急不可待的任务。文章通过对矿井先前采集以及该孔采集的水样进行详细的水质对比,并根据该孔简易放水试验水量衰减情况以及水压情况,综合判断出出水水源。     

Stabilizing CO2 concentrations with incomplete international cooperation

Many stabilization scenarios have examined the implications of stabilization on the assumption that all regions and all sectors of all of the world's economies undertake emissions mitigations wherever and whenever it is cheapest to do so. This idealized assumption is just one of many ways in which emissions mitigation actions could play out globally, but not necessarily the most likely. This paper explores the implications of generic policy regimes that lead to stabilization of CO₂ concentrations under conditions in which non-Annex I regions delay emissions reductions and in which carbon prices vary across participating regions. The resulting stabilization scenarios are contrasted with the idealized results. Delays in the date by which non-Annex I regions begin to reduce emissions raise the price of carbon in Annex I regions relative to the price of carbon in Annex I in an idealized regime for any given CO₂ concentration limit. This effect increases the longer the delay in non-Annex I accession, the lower the non-Annex I carbon prices relative to the Annex I prices, and the more stringent the stabilization level. The effect of delay is very pronounced when CO₂ concentrations are stabilized at 450 ppmv, however the effect is much less pronounced at 550 ppmv and above. For long delays in non-Annex I accession, 450 ppmv stabilization levels become infeasible.     

金昌热电厂空冷气象条件分析

空冷气象对比观测是空冷电厂勘测设计过程中提供客观反映空冷环境气象条件所必须的技术手段和方法。通过2008年4月1日至2009年3月31日金昌热电厂建设初期在厂址处建立的临时气象观测站资料,和临近气象站——金昌站的观测资料对比分析,通过相关的数学模型重建电厂厂址处近10a的气象资料,进行分析研究得出电力设计最终所需的各种气象参数和指标。     

基于DSP的小型化高精度频标比对系统研制

针对传统双混频时差法测频的局限性,提出了一种差拍数字化精密频率测量方法,基于正弦差拍技术、同步采样技术和数字信号处理技术设计实现了一种新型频标比对系统,可实现对5MHz、10MHz等频标信号的比对测量。实验结果证明,测量10MHz频标信号时系统本底噪声约为1×10^-12／s。系统拥有测量精度高,体积小以及成本低的特点,在时频测量领域具有良好的推广和应用价值。     

兰州地震台阵监测能力研究

利用兰州地震台阵与兰州地震台数字化近两年的资料,对地震震相特征和震级进行对比分析,结果发现：地震记录震相特征基本相同,台阵有压低干扰背景和突出地震波信号的功能,说明台阵对记录较微弱地震有优势;在震中距小于1 000 km的范围内,兰州台阵的监测能力较明显高于兰州台,而震中距大于1 000 km时,兰州地震台阵与兰州地震台的监测能力相当.     

URBAN LIVEABILITY: A COMMENTARY

The paper compares density patterns of the three largest Canadian metropolitan regions with those of a sample of 12 U.S. urban areas with comparable populations. It verifies if such patterns support claims of Canadian urban distinctiveness prevalent within this country's research literature. Findings indicate that regional differences among U.S. cities are as important as cross-national distinctions. Measures of centrality and overall density place observed Canadian metropolitan areas within the same category as older U.S. East Coast metropolitan areas. Inter-city comparisons of historically and geographically defined zones suggest a period of cross-national convergence before World War II, when the inner city was developed, followed by a period of divergence from the 1940s to the 1970s, when the inner suburb was built. The development of the outer suburb, which began in the early 1970s, marks a return to cross-national convergence. These results question the continued relevance of the literature on the distinctiveness of Canadian urbanization.     

Comparison of land cover maps using fuzzy agreement

A generic problem associated with different land cover maps that cover the same geographical area is the use of different legend categories. There may be disagreement in many areas when comparing different land cover products even though the legend shows the same or very similar land cover class. To capture the uncertainty associated with both differences in the legend and the difficulty in classification when comparing two land cover maps, expert knowledge and a fuzzy logic framework are used to map the fuzzy agreement. The methodology is illustrated by comparing the Global Land Cover 2000 data set and the MODIS global land cover product. Overall accuracy measures are calculated, and the spatial fuzzy agreement between the two land cover products is provided. This approach can be used to improve the overall confidence in a land cover product, since areas of severe disagreement can be highlighted, and areas can be identified that require further attention and possible re-mapping.     

A COGNITIVE SCALAR FOR THE PUBLIC TRANSPORT CONNECTION MATRIX

The degree to which people judge the change in transit service level as service connectivity changes is assumed to vary with total transfer waiting time. An experiment was devised to collect measures of cognized connectivity of intercity transit services in relation to transfer time, and cognitive scalar values were consequently derived. An inverse relationship was found between cognized service level and connectivity; cognized transit level decreased at a decreasing rate. An analysis of the bus-service network in the Israeli Galilee region suggests the appropriateness of cognitive scalars for measuring the internodal accessibility of public transport services.     

比选法与层次分析法在农安支线供水线路优选中的应用

为优选农安支线供水工程输水线路,依据输水线路布置原则,对拟定的东线、西线、东西组合线和河道线共4 条比选方案,采用比选法和层次分析法,从施工条件、运行管理、供水安全和投资费用等方面进行了线路优选分析计算,结论为西线方案最优。西线方案具有工程布置相对容易、运行管理方便、供水较为安全及投资费用低的优点。论文还对河道输水的弃选方案进行了初步讨论。     

岩浆作用成矿与找矿学术研讨会在西安召开 ——兼论对小岩体成矿禀赋条件的理解

"小岩体成大矿"是汤中立院士针对岩浆硫化物矿床提出的重要概念,已广为国内外学术界认可,经过多年的发展,这一理论在地质找矿实践中发挥着越来越大的作用。目前,这一成矿理论体系框架、成矿机理、成矿禀赋条件等还在不断完善和丰富中。近期汤中立院士对小岩体成矿禀赋概括为"小、广、大、高、浅(潜)"的5字特征。本文在学习理解小岩体成矿禀赋条件的基础上,对甘肃省部分小岩体成矿特征进行对比,以期在小岩体成矿理论指导下,部署勘查工作,实现地质找矿新突破。