نتایج جستجو برای: guard rail

تعداد نتایج: 17006  

2008
Benjamin J. Blalock Phillip E. Allen Gabriel A. Rincon-Mora

This paper addresses the difficulty of designing 1-V capable analog circuits in standard digital complementary metal–oxide–semiconductor (CMOS) technology. Design techniques for facilitating 1-V operation are discussed and 1-V analog building block circuits are presented. Most of these circuits use the bulk-driving technique to circumvent the metal– oxide–semiconductor field-effect transistor t...

2012
G. M. Mir N. A. Shah

Guard channels improve the probability of successful handoffs by reserving a number of channels exclusively for handoffs. This concept has the risk of underutilization of radio spectrum due to the fact that fewer channels are granted to originating calls even if these guard channels are not always used, when originating calls are starving for the want of channels. The penalty is the reduction o...

Journal: :Nature Reviews Immunology 2002

2001
S W Kirkpatrick M Schroeder J W Simons

In recent years there has been an increased effort to investigate and improve the crashworthiness of passenger rail vehicles in the United States. The structural crashworthiness requirements for new rail vehicles are changing to include specifications for crash energy management and crush zones rather than primarily specifications of vehicle and component strengths. In addition, the structural ...

Journal: :Bioinformatics 2017
Abhinav Nellore Leonardo Collado-Torres Andrew E. Jaffe José Alquicira-Hernández Christopher Wilks Jacob Pritt James Morton Jeffrey T. Leek Ben Langmead

Motivation RNA sequencing (RNA-seq) experiments now span hundreds to thousands of samples. Current spliced alignment software is designed to analyze each sample separately. Consequently, no information is gained from analyzing multiple samples together, and it requires extra work to obtain analysis products that incorporate data from across samples. Results We describe Rail-RNA, a cloud-enabl...

2014
Parag Chatterjee Asoke Nath

The demand for safe, fast, and reliable rail services continues to be the reason for concern in all the countries across the globe. Lack of operational efficiency and reliability, safety and security issues, and aging railway systems and practices are haunting various countries to bring about a change in their existing rail infrastructure. The global rail industry struggles to meet the increasi...

ژورنال: Journal of Railway Research 2021
GEBRE, ABRHAM , KASSA, ELIAS, NTAKIYEMUNGU , MATHIEU,

There are several factors causing fastening systems to deteriorate faster than the designed life. The high repetitive loads from a moving train being one of the main factors, track irregularities, design and installation defects of track components, non-uniform rail support stiffness, unevenness in the rail seat deterioration are some of the factors causing fastenings systems to deteriorate fas...

2017
Rubel Biswas Ahmed Khan Samiul Islam Jia Uddin

In this paper, we have designed a machine visionbased method to identify the defected or missed or grounded rail anchors/fasteners that attach each line with the sleepers. Rail line inspection system is executed manually, especially in third world countries, like Bangladesh. This manual inspection is lengthy, laborious and subjective. To detect and classify the damaged or missed or grounded rai...

2013
Albert Wijeweera Michael Charles

Considerable yet largely unexpected growth in passenger rail demand has occurred recently in Australian capital cities. This article uses historical data, together with modern time series methods, to examine empirically the factors that might have contributed to growth in passenger rail demand in Melbourne, Australia, and to gain greater insight into the relationships between the various explan...

Journal: :Environmental science & technology 2005
Joule A Bergerson Lester B Lave

We examine the life cycle costs, environmental discharges, and deaths of moving coal via rail, coal gas via pipeline, and electricity via wire from the Powder River Basin (PRB) in Wyoming to Texas. Which method has least social cost depends on how much additional investment in rail line, transmission, or pipeline infrastructure is required, as well as how much and how far energy is transported....

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