排序方式： 共有34条查询结果，搜索用时 734 毫秒
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冀北榆树沟煤矿区褐煤地下气化地质条件分析 总被引：1，自引：0，他引：1
通过对冀北沽源县榆树沟煤矿白芈系青石砬组含煤地层地质条件进行分析,认为仵该矿区进行煤炭地下气化是可行的。研究区构造简单,为一轴向近东西向的舒缓向斜,主要煤层厚度大,最大平均厚度为24.31m。可采煤层顶板多为泥岩、炭质泥岩,尤其是煤系上覆的“三趾马红土”层,对气体有良好的圈闭作用。由于褐煤的灰分含量高,26％～49．03％,地下气化时对煤层顶板影响小,主要煤层埋藏浅200—300m,水文地质条件简单,根据诸多因素分析认为该矿区适合进行褐煤地下气化开采。 相似文献
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This paper systematically compares modeled rates of change provided by global integrated assessment models aiming for the 2 °C objective to historically observed rates of change. Such a comparison can provide insights into the difficulty of achieving such stringent climate stabilization scenarios. The analysis focuses specifically on the rates of change for technology expansion and diffusion, emissions and energy supply investments. The associated indicators vary in terms of system focus (technology-specific or energy system wide), temporal scale (timescale or lifetime), spatial scale (regional or global) and normalization (accounting for entire system growth or not). Although none of the indicators provide conclusive insights as to the achievability of scenarios, this study finds that indicators that look into absolute change remain within the range of historical growth frontiers for the next decade, but increase to unprecedented levels before mid-century. Indicators that take into account or normalize for overall system growth find future change to be broadly within historical ranges. This is particularly the case for monetary-based normalization metrics like GDP compared to energy-based normalization metrics like primary energy. By applying a diverse set of indicators alternative, complementary insights into how scenarios compare with historical observations are acquired but they do not provide further insights on the possibility of achieving rates of change that are beyond current day practice. 相似文献
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低纬子午环配备科学CCD的必要性和可行性 总被引：1，自引：1，他引：0
从基本天体测量学科的发展趋势和低纬子午环的课题目标出发，叙述了该仪器配备科学ＣＣＤ的必要性和对仪器性能的相应要求，并根据仪器的各种误差的测定方法和测定精度的分析，论述了该仪器配备科学ＣＣＤ后对天体位置作高精度绝对测定的可行性，文中还提出了对配备科学ＣＣＤ的总体要求。 相似文献
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为了改善传统岩性密度测井仪的缺陷,本文基于传统的双 源距探测器密度测井仪,提出在负源距范围内增加一个反散射探测器,构成新的三探测器密 度测井仪器. 利用Monte Carlo方法通用程序MCNP(3B),从光子与地层相互作用的机理出发 ,计算得到了反散射探测器、长源距探测器和短源距探测器的光子通量的能谱分布、光子通 量与源距的关系、光子通量与地层密度的关系、源距与探测深度的关系以及计数能窗等. 从 结果看,三探测器密度测井仪的长、短源距探测器对地层的响应关系与双源距密度测井仪的 长、短源距探测器一致,而反散射探测器对地层具有明确的响应关系,其响应关系与长、短 源距探测器近似相反,且其计数率很高. 因此,在负源距范围内增加第三个探测器是可行的 ,这将有利于提高密度测井的测量精度和垂向分辨率. 同时表明了Monte Carlo方法在核测 井仪器早期研制中的有效性,对仪器设计具有指导作用. 相似文献
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隔震技术是近几十年来地震工程最重要成果之一,是一种经济、可靠、有效的防震减灾技术,但在实际工程中应用率较低,主要原因是对其成熟有效性和经济性等不够了解。通过分析相应的规范、标准和隔震工程实例在破坏性地震中的表现来说明隔震技术的成熟性,通过对已建隔震建筑与传统建筑的对比,分析了隔震技术的经济性,结合隔震技术优点与乌鲁木齐地区特殊的地震构造环境和地震危险性,提出在乌鲁木齐地区进一步推广应用隔震技术的可行性和必要性。 相似文献
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The resistance factor for pile foundations in load and resistance factor design (LRFD) is traditionally calibrated considering target reliability index (βT) and statistics of load and resistance bias factors. However, the resistance bias factor is hard to quantify statistically. Consequently, the design obtained using the calibrated resistance factor can still miss βT if the variation in resistance bias factor has been underestimated. In this paper, we propose a new resistance factor calibration approach to address this dilemma by considering “feasibility robustness” of design in the calibration process. Herein, the feasibility robustness is defined as a probability that the βT requirement can still be satisfied even in the presence of uncertainty or variation in the computed bearing capacity. For illustration, LRFD approach for pile foundations commonly used in Shanghai, China is examined. Emphasis is placed on re-calibration of resistance factors at various feasibility robustness levels, with due consideration of the variation in the resistance bias factor. A case study is presented to illustrate the use of the re-calibrated resistance factors. The results show that the feasibility robustness is gained at the expense of cost efficiency; in other words, the two objectives are conflicting. To aid in the design decision-making, an optimal feasibility robustness level and corresponding resistance factors are suggested in the absence of a designer’s preference. 相似文献
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Patrick Christie David L. Fluharty Alan T. White Liza Eisma-Osorio William Jatulan 《Marine Policy》2007
This analysis documents the reasons for emerging interest in ecosystem-based fisheries management (EBFM) and relates this management model to others. It highlights the central challenges to EBFM in the tropical context and examines an ongoing project, Fisheries Improved for Sustainable Harvest (FISH), in the Philippines—likely the first EBFM project in the tropics. The Philippine legal and institutional context provides major governance challenges to EBFM, especially as management is scaled up. A monitoring framework with process and output criteria is applied to FISH to establish progress to date. Major institutional and governance challenges for EBFM will require monitoring, evaluation, and adaptation. 相似文献