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中国小机场支线航空的空间格局与服务水平 被引量:7
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作者 廖家仪 戴特奇 《热带地理》 2017年第2期238-245,共8页
系统梳理了国内外支线航空的概念,总结出支线航程<800 km的判断标准,采集了2014年旅客吞吐量<10万人次的机场的航线数据,分析了这些小机场的支线航空发展的总体水平和空间分布特征。结果发现:小机场的支线发展总体水平不高,只有41... 系统梳理了国内外支线航空的概念,总结出支线航程<800 km的判断标准,采集了2014年旅客吞吐量<10万人次的机场的航线数据,分析了这些小机场的支线航空发展的总体水平和空间分布特征。结果发现:小机场的支线发展总体水平不高,只有41%的航线符合支线定义,主要分布在中国西部地区;支线的运营效率要优于非支线,前者的平均起降频次是后者的2.3倍,且满足每天≥1班频次的航线中支线航线占了53.1%,且估算表明平均上座率支线比非支线高近10%。 展开更多
关键词 支线航空 小机场 航线结构 运营效率
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小机场发展、交叉补贴与差异化收费研究 被引量:2
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作者 高泰帜 张瑾玮 庞东亮 《中国物价》 2020年第4期84-87,共4页
本文从国际民航组织对小机场可持续发展的讨论出发,厘清了机场网络和小机场的有关概念,梳理了全球特别是我国机场网络和小机场的发展现状,深入分析了政府补贴和交叉补贴对小机场可持续发展的影响,并在此基础上分析了差异化收费机制情况... 本文从国际民航组织对小机场可持续发展的讨论出发,厘清了机场网络和小机场的有关概念,梳理了全球特别是我国机场网络和小机场的发展现状,深入分析了政府补贴和交叉补贴对小机场可持续发展的影响,并在此基础上分析了差异化收费机制情况下,机场网络中交叉补贴的可行性。考虑到世界各国包括我国部分地方政府财力情况,本文讨论的机场网络中的交叉补贴就会成为提升小机场保障能力的一种选择。 展开更多
关键词 小机场 机场网络 交叉补贴 差异化收费
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TONE MODELING BASED ON HIDDEN CONDITIONAL RANDOM FIELDS AND DISCRIMINATIVE MODEL WEIGHT TRAINING 被引量:1
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作者 黄浩 朱杰 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2008年第1期43-50,共8页
The use of hidden conditional random fields (HCRFs) for tone modeling is explored. The tone recognition performance is improved using HCRFs by taking advantage of intra-syllable dynamic, inter-syllable dynamic and d... The use of hidden conditional random fields (HCRFs) for tone modeling is explored. The tone recognition performance is improved using HCRFs by taking advantage of intra-syllable dynamic, inter-syllable dynamic and duration features. When the tone model is integrated into continuous speech recognition, the discriminative model weight training (DMWT) is proposed. Acoustic and tone scores are scaled by model weights discriminatively trained by the minimum phone error (MPE) criterion. Two schemes of weight training are evaluated and a smoothing technique is used to make training robust to overtraining problem. Experiments show that the accuracies of tone recognition and large vocabulary continuous speech recognition (LVCSR) can be improved by the HCRFs based tone model. Compared with the global weight scheme, continuous speech recognition can be improved by the discriminative trained weight combinations. 展开更多
关键词 speech recognition MODELS hidden conditional random fields minimum phone error
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Present Tectonic Stress Field in the Capital Region of China Inverted from Focal Mechanisms of Small and Strong Earthquakes 被引量:1
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作者 Huang Jichao Wan Yongge 《Earthquake Research in China》 CSCD 2015年第4期485-497,共13页
A dense seismic network was installed in the capital region of China in recent years,which makes it possible to resolve the focal mechanisms of small earthquakes. We gathered large earthquake focal mechanisms from the... A dense seismic network was installed in the capital region of China in recent years,which makes it possible to resolve the focal mechanisms of small earthquakes. We gathered large earthquake focal mechanisms from the last fifty years and moderate or small earthquake focal mechanisms from between 2002 and 2004,and calculated the present tectonic stress field of the capital region by the grid search method, which weighs different sized earthquakes and can improve the accuracy of the stress field inversion. The analysis of inversion results of different sub-regions shows that the azinuth of the maximum principal compressive stress axis is NE43°- 86° in the Beijing-Zhangjiakou-Datong area,NE38°-86° in the Tangshan area,and NE79°- 81° in the Xingtai area. Inversion results of this paper are similar to previous results,which proves the correctness of the approach. As revealed by the results,the stress field of the capital region is characterized by overall consistency and sub-regional differences. This study provides reference for earthquake mechanism explanation and geodynamics research. 展开更多
关键词 Focal mechanism Grid search Tectonic stress field The capital region of China
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Study on Performance and Flow Field of an Undershot Cross-Flow Water Turbine Comprising Different Number of Blades 被引量:1
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作者 Yasuyuki Nishi Kentaro Hatano Terumi Inagaki 《Journal of Thermal Science》 SCIE EI CAS CSCD 2017年第5期413-430,共18页
Recently, small hydroelectric generators have gained attention as a further development in water turbine technology for ultra low head drops in open channels. The authors have evaluated the application of cross-flow w... Recently, small hydroelectric generators have gained attention as a further development in water turbine technology for ultra low head drops in open channels. The authors have evaluated the application of cross-flow water turbines in open channels as an undershot type after removing the casings and guide vanes to substantially simplify these water turbines. However, because undershot cross-flow water turbines are designed on the basis of cross-flow water turbine runners used in typical pipelines, it remains unclear whether the number of blades has an effect on the performance or flow fields. Thus, in this research, experiments and numerical analyses are employed to study the performance and flow fields of undershot cross-flow water turbines with varying number of blades. The findings show that the turbine output and torque are lower, the fluctuation is significantly higher, and the turbine efficiency is higher for runners with 8 blades as opposed to those with 24 blades. 展开更多
关键词 Water Turbine Cross-Flow Turbine Free Surface PERFORMANCE Flow Field Number of Blades
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Minimal Length Effects on Schwinger Mechanism
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作者 木本荣 王鹏 杨海棠 《Communications in Theoretical Physics》 SCIE CAS CSCD 2015年第6期715-720,共6页
In this paper, we investigate effects of the minimal length on the Schwinger mechanism using the quantum field theory (QFT) incorporating the minimal length. We first study the Schwinger mechanism for scalar fields ... In this paper, we investigate effects of the minimal length on the Schwinger mechanism using the quantum field theory (QFT) incorporating the minimal length. We first study the Schwinger mechanism for scalar fields in both usual QFT and the deformed QFT. The same calculations are then performed in the case of Dirac particles. Finally, we discuss how our results imply for the corrections to the Unruh temperature and the Hawking temperature due to the minimal length. 展开更多
关键词 minimal length Schwinger mechanism quantum gravity
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