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Digitale Medien

Two new carnivores from an unusual late Tertiary forest biota in eastern North America (2004)

Wallace, Steven C. ; Wang, Xiaoming

[s.l.] : Macmillian Magazines Ltd.

Nature 431 (2004), S. 556-559

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] Late Cenozoic terrestrial fossil records of North America are biased by a predominance of mid-latitude deposits, mostly in the western half of the continent. Consequently, the biological history of eastern North America, including the eastern deciduous forest, remains largely hidden. ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/nature02819

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Hybrid Model for Early Onset Prediction of Driver Fatigue with Observable Cues (2014)

Mingheng Zhang, Gang Longhui, Zhe Wang, Xiaoming Xu, Baozhen Yao, and Liping Zhou

Hindawi

In: Mathematical Problems in Engineering

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Publikationsdatum: 2014-07-14

Beschreibung: This paper presents a hybrid model for early onset prediction of driver fatigue, which is the major reason of severe traffic accidents. The proposed method divides the prediction problem into three stages, that is, SVM-based model for predicting the early onset driver fatigue state, GA-based model for optimizing the parameters in the SVM, and PCA-based model for reducing the dimensionality of the complex features datasets. The model and algorithm are illustrated with driving experiment data and comparison results also show that the hybrid method can generally provide a better performance for driver fatigue state prediction.

Print ISSN: 1024-123X

Digitale ISSN: 1563-5147

Thema: Mathematik , Technik allgemein

Publiziert von Hindawi

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A Study on Preventing Spontaneous Combustion of Residual Coal in a Coal Mine Goaf (2015)

Yongjun Wang, Xiaoming Zhang, Yuichi Sugai, and Kyuro Sasaki

Hindawi

In: Journal of Geological Research

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Publikationsdatum: 2015-04-01

Beschreibung: The effectiveness of grouting scheme has been simulated to prevent the coal spontaneous combustion at a goaf in Haizi Colliery, China. The colliery has been operated for long period over 27 years and has a complex ventilation network including airflow leakages which could possibly lead to the spontaneous combustion of coal at goafs. Firstly, the mine ventilation simulator MIVENA was used to analyze the mine ventilation network airflows to control airflows in and out of working faces and goafs. As the second approach, numerical simulations were carried by the simulator FLUENT in order to predict spontaneous combustion of residual coal with leakage flow in the #3205 goaf. It was cleared that the goaf can be divided into three zones based on oxygen concentration in the goaf area. Finally, the numerical simulation results show that the slurry grouting method is able to be an effective and economical method by reducing porosity in the goaf area to prevent spontaneous combustion of residual coal.

Print ISSN: 1687-8833

Digitale ISSN: 1687-8841

Thema: Geologie und Paläontologie

Publiziert von Hindawi

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