共查询到20条相似文献，搜索用时 31 毫秒
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天津市建设管理委员会 《中国勘察设计》2004,(12):22-23
经过近几年的努力，天津建筑业整体水平取得了长足进步，已经成为天津经济发展的支柱产业。2003全市实现建筑业总产值510亿元，同比2002年增长25％；实现建筑业增加值120亿元，同比增长24％，占全国市场生产总值比重5．1％，第一次超过房地产贡献率。预计2004年实现建筑业总产值640亿元，建筑业增加值150亿元，为我市国民经济持续高速增长做出了积极的贡献。归纳我市加快建筑业改革与发展主要做法有五方面： 相似文献
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在对长期积累的生产数据进行分析总结的基础上,本文从机组运行方式、设备配置、技术改造等角度,论述了降低汽机发电热耗,提高燃烧效率,降低厂用电率的一些常规方法,并就各种具体技术、方法对提高机组经济水平的影响程度进行分析和比较。认为,通过综合应用当前比较成熟的多项技术,开展扎实有效的节能工作,国产机组的平均经济水平应该能够达到：200MW机组的供电煤耗为353g/kwh,电泵运行厂用电率为7.5%;300MW机组的供电煤耗为340g/kwh,在汽泵运行工况下,厂用电率在5%以下;600MW机组的供电煤耗达到310g/kwh的水平。 相似文献
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做好传统地质、建好绿水青山——在中国地质学会第十二次全国会员代表大会上的讲话 总被引：1，自引：0，他引：1
正各位代表,同志们:下午好!在刚刚结束的全体理事大会上,大家选举我担任中国地质学会第40届理事会理事长,我感到非常荣幸,也深感责任重大。在此,我代表新当选的第40届理事会对大家的信任表示衷心的感谢!我将认真履行理事长的职责,和全体常务理事一道,在中国科协和国土资源部的领导下,在历届理事会工作的基础上,团结带领全体理事,认真学习宣传贯彻党的十九大精神,以习近平新时代中国特色社会主义思想为指 相似文献
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本不想写什么了，可是《国务院关于加强地质工作的决定》的发布，我为之一振，因为《决定》为地质工作的发展指明了方向，给地质工作带来了又一个春天!国务院这一重大决策，是我国地质工作历史进程中具有咀程碑意义的大事，是推进新时期地质工作发展的纲领性文件。此前小久，国务院还发布了指导我国科技发展的纲领性文件——《国家中长期科学和技术发展规划纲要》。 相似文献
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Water and gas samples from research wells in hydrothermal areas of Yellowstone National Park, U.S.A., have been mass spectrometrically analyzed for their rare gas contents and isotopic composition. In agreement with previous findings, the rare gases have been found to originate from infiltrating run-off water, saturated with air at 10 to 20°C. The atmospheric rare gas retention values found for the water varied between 3 and 87 per cent. The fine structure of the Ar, Kr and Xe abundance pattern in the water reveals fraotionational enrichment of the heavier gases due to partial outgassing of the waters. Radiogenic He and Ar have been detected. No positive evidence for magmatic water contribution has been found. Nevertheless, additions of magmatic waters free of rare gas can not be excluded, but if present the proportion is significantly less than 13 to 36 per cent. 相似文献
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沉积记录研究的现代过程视角 总被引：1，自引：1，他引：0
沉积记录是揭示地球演化的主要数据来源之一,地层学提供了宏观大尺度沉积记录的分析方法,而沉积学则提高了沉积记录的时空分辨率。但上述方法主要是针对沉积体系特征和现象信息的,而有关沉积体系过程和机制信息的提取还较为薄弱。通过评述现代过程在沉积记录研究中的定位,提出了新的科学问题。研究结果表明,基于现代过程研究的勘测性模拟是一种值得追求的方法。经典数值模拟依赖于未知变量与方程个数相同的控制方程,用实测数据作为验证材料,而勘测性模拟是控制方程加工作假说构成的体系,其模型输出指示了过程—产物关系。因此,通过现代沉积体系模拟及其与钻孔资料的对比,可以获取沉积记录所含的过程和机制信息。勘测性模拟也是地球久远时代沉积记录的潜在分析工具。 相似文献
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Judit Timár 《Geoforum》2004,35(5):533-538
The paper assesses the inequalities of the production of geographical knowledge mainly against the backdrop of the East-West relations, which still dominate Hungarian practice. However, it also offers examples of Anglo-American hegemony making itself felt more acutely; or of Hungarian geographers, at the receiving end of these dimensions of hegemony, producing hegemony in a different system of relations. Investigating the political economic power relations underlying this hegemony and the social agents involved in `hegemony-producing' helps establish potential strategies of putting an end to the inequalities of academic knowledge production. Some possibilities of these strategies are outlined. 相似文献
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More Space for running waters: Negotiating institutional change in the Swiss flood protection system
Marc Zaugg 《GeoJournal》2002,58(4):275-284
Resulting in part from massive floods in the 1970s, 1980s and 1990s, the institutional framework structuring flood protection in Switzerland has undergone considerable changes. This can be described as a `change in philosophy' – a term meant to express the change from a primarily technologically oriented `expert system' to one committed to the concept of sustainability. Sustainability, though, calls for the coordination of many expectations. Therefore, flood protection projects are today often negotiated against the backdrop of conflicting interests and are usually associated with a substantial change of the existing rules regarding the use and protection of a stretch of running water and its spatial environment. Nowadays, different actors from diverse social and state levels are participating in these conflicts about territoriality and scale. This article illustrates such a negotiation process using the example of a specific flood protection project on the River Thur in Eastern Switzerland. 相似文献
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Estimation of Pearson’s correlation coefficient between two time series, in the evaluation of the influences of one time-dependent variable on another, is an often used statistical method in climate sciences. Data properties common to climate time series, namely non-normal distributional shape, serial correlation, and small data sizes, call for advanced, robust methods to estimate accurate confidence intervals to support the correlation point estimate. Bootstrap confidence intervals are estimated in the Fortran 90 program PearsonT (Mudelsee, Math Geol 35(6):651–665, 2003), where the main intention is to obtain accurate confidence intervals for correlation coefficients between two time series by taking the serial dependence of the data-generating process into account. However, Monte Carlo experiments show that the coverage accuracy of the confidence intervals for smaller data sizes can be substantially improved. In the present paper, the existing program is adapted into a new version, called PearsonT3, by calibrating the confidence interval to increase the coverage accuracy. Calibration is a bootstrap resampling technique that performs a second bootstrap loop (it resamples from the bootstrap resamples). It offers, like the non-calibrated bootstrap confidence intervals, robustness against the data distribution. Pairwise moving block bootstrap resampling is used to preserve the serial dependence of both time series. The calibration is applied to standard error-based bootstrap Student’s $t$ confidence intervals. The performance of the calibrated confidence interval is examined with Monte Carlo simulations and compared with the performance of confidence intervals without calibration. The coverage accuracy is evidently better for the calibrated confidence intervals where the coverage error is acceptably small already (i.e., within a few percentage points) for data sizes as small as 20. 相似文献
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Cox Robin S. Hill Tiffany T. Plush Tamara Heykoop Cheryl Tremblay Crystal 《Natural Hazards》2019,96(1):213-224
Fire has become one of the main disturbances in terrestrial ecosystems worldwide. It is known that elevation influences the occurrence of fire events; however, this variable has been poorly studied, although it is of particularly relevance to the Mexican topography. The objective of this research was to analyze the altitudinal distribution of forest fires in Mexico over a period of 11 years. Elevation gradients were defined based on a Digital Elevation Model and the main ecoregions of the country: (1) shrubland and tropical forests (0–1000 masl), (2) grasslands (1001–2000 masl) and (3) temperate forests (>?2000 masl). Each ecoregion was divided into Climate Research Units and the number of fires per unit was quantified. The G Getis–Ord statistic was applied in order to define the spatial patterns presented by the fire events. A relationship between the occurrence of fires and the El Niño Southern Oscillation phenomenon was also determined through a Pearson correlation. The results showed that the occurrence of fire events presented variability along elevation gradients, with elevation a determining factor in their occurrence. Gradient 3, with the highest elevation, had the greatest number of fires and also presented the largest area of fire event clustering. These results contribute to the knowledge of the spatial distribution of forest fires in Mexico and are of value to appropriate decision-making for effective fire management.
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