نتایج جستجو برای: underground transportation

تعداد نتایج: 71782  

2013
Alexey A. Dudarev Eugenia V. Dushkina Yuliya N. Sladkova Pavel R. Alloyarov Valery S. Chupakhin Vitaliy M. Dorofeyev Tatjana A. Kolesnikova Kirill B. Fridman Birgitta Evengard Lena M. Nilsson

BACKGROUND Poor state of water supply systems, shortage of water purification facilities and disinfection systems, low quality of drinking water generally in Russia and particularly in the regions of the Russian Arctic, Siberia and Far East have been defined in the literature. However, no standard protocol of water security assessment has been used in the majority of studies. STUDY DESIGN AND...

2009
Adel Ali Ahmed Norsheila Fisal

A Wireless Underground Sensor Network (WUSN) is a network of wireless sensor devices in which all sensor devices are deployed completely underground (network sinks or any devices specifically for relay between sensors and a sink may be aboveground). These networks can be utilized to monitor the underground environment, especially soil conditions and aboveground events, such as the presence of p...

2017
Xiaoqiong Qin Mengshi Yang Lu Zhang Tianliang Yang Mingsheng Liao

Since the Persistent Scatterer Synthetic Aperture Radar (SAR) Interferometry (PSI) technology allows the detection of ground subsidence with millimeter accuracy, it is becoming one of the most powerful and economical means for health diagnosis of major transportation infrastructures. However, structures of different types may suffer from various levels of localized subsidence due to the differe...

2007
David Levinson Feng Xie

This paper examines the nature of first mover advantages on spatiallydifferentiated surface transportation networks. The literature on first mover advantages identifies a number of sources that explain their existence. However whether those sources exist on spatial networks, and how they play out with true capital immobility have been unanswered questions. By examining empirical examples includ...

2010
Maite Peña

This paper deals with the design of timetables for complex railway systems. Rail transportation has become a rapid, clean and efficient way to transport passengers and freights. A good timetable design is crucial to ensure the quality of the services trying to improve the efficiency of the whole system. Only such a sustainable transportation system will be in accordance to the requirements of f...

2015
John A. Stoop

To accommodate future growth and economic development, various autonomous developments take place simultaneously in the Netherlands. On one hand, regional economical development focuses on spatial planning, characterized by concepts such as compact cities, transportation corridors and multifunctional use of limited space, including underground infrastructure. On the other hand, developments in ...

Journal: :CoRR 2015
Xin Tan Zhi Sun Ian F. Akyildiz

Wireless underground sensor networks (WUSNs) can enable many important applications such as intelligent agriculture, pipeline fault diagnosis, mine disaster rescue, concealed border patrol, crude oil exploration, among others. The key challenge to realize WUSNs is the wireless communication in underground environments. Most existing wireless communication systems utilize the dipole antenna to t...

2015
Sangmin Kim Jeonghyun Kim Jaehoon Jung Joon Heo

The cadastral system provides land ownership information by registering and representing land boundaries on a map. The current cadastral system in Korea, however, focuses mainly on the management of 2D land-surface boundaries. It is not yet possible to provide efficient or reliable land administration, as this 2D system cannot support or manage land information on 3D properties (including archi...

2013
Matthew Loxham Matthew J. Cooper Miriam E. Gerlofs-Nijland Flemming R. Cassee Donna E. Davies Martin R. Palmer Damon A. H. Teagle

Underground railway stations are known to have elevated particulate matter (PM) loads compared to ambient air. As these particles are derived from metal-rich sources and transition metals may pose a risk to health by virtue of their ability to catalyze generation of reactive oxygen species (ROS), their potential enrichment in underground environments is a source of concern. Compared to coarse (...

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