EMF on Rails

This is an electronic version of the paper presented at the 7th International Conference on Software Paradigm Trends, ICSOFT 2012, held in Rome.In this paper we propose leveraging existing frameworks for automated web application development, in the style of Ruby on Rails, Grails and Spring Roo, for their use within a Model-Driven Engineering process. Our approach automates the construction of domain-specific generators for web applications in particular domains. These generators are able to synthesize web applications using Spring Roo, starting from annotated models. In this way, designers of web applications do not need to be proficient in web automation frameworks, but they can benefit from the use of domain-specific, intuitive models. We illustrate our approach by generating an application to edit Eclipse Modelling Framework (EMF) models through the web.This work was supported by a grant provided by CONACyT and Tecnol´ogico de Monterrey, Mexico City Campus. This research is part of the project ”Dynamic Probabilistic Graphical Models and their Applications”, number 95185, funded by CONACyT and the European Union through FONCICyT. This work is also supported by the Spanish Ministry of Economy and Competitivity (TIN2011-24139) and the R&D programme of the Madrid Region (S2009/TIC-1650)

Assessment and comparison of total RF-EMF exposure in femtocell and macrocell base station scenarios

The indoor coverage of a mobile service can be drastically improved by deployment of an indoor femtocell base station (FBS). However, the impact of its proximity on the total exposure of the human body to radio-frequency (RF) electromagnetic fields (EMFs) is unknown. Using a framework designed for the combination of near-field and far-field exposure, the authors assessed and compared the RF-EMF exposure of a mobile-phone (MP) user that is either connected to an FBS or a conventional macrocell base station while in an office environment. It is found that, in average macrocell coverage and MP use-time conditions and for Universal Mobile Telecommunications System technology, the total exposure can be reduced by a factor of 20-40 by using an FBS, mostly due to the significant decrease in the output power of the MP. In general, the framework presented in this study can be used for any exposure scenario, featuring any number of technologies, base stations and/or access points, users and duration

ANALYSIS OF ELECTROMAGNETIC LAUNCHER DESIGN AND MODELING

This thesis derives working expressions from electromagnetic physical laws to gain a deeper understanding of the nature of railguns. The expressions are refined for ease of use and then compared to electromagnetic simulators that solve complex equations that arise from different rail geometry. Further simplifications lead to an expression for the final velocity of the projectile and showcase the importance of the system resistance to projectile flux gain ratio. A Simulink simulation then incorporates the resulting non-linear differential equations and approximates the projectile velocity over time based on physical dimensions and material properties. Some equations derived can be found in literature regarding the subject but often lack explanation. This work is intended to provide a thorough derivation of all the relative constituent relations between the critical characteristics of the gun such as the strength of the forces acting on the rail and projectile, rail current, and initial velocity of the projectile. This makes it easier to identify what influences acceleration of the projectile, how much bracing each rail needs, how much initial velocity to give the projectile, etc. Design options discussed besides the standard design include the augmented rail system, a magnetic shell design, and a “wrap around” design. The tradeoffs encountered in each design are discussed in length. Due to the lack of a sufficient power source during testing the projectile was unable to travel down the length of the rails due to metal binding, insufficient pulse duration, and too much circuit resistance. It was found that using copper tungsten for the rails ensures that the rails can withstand the arcing inflicted by the kilo-Ampere current along the rails very well compared to other materials. Also, the copper in the tungsten alloy ensures high conductivity while the tungsten provides structural integrity to the rails during arcing between them and the projectile. Frequency response of conductive projectiles is characterized and improvements such as laminated projectiles are suggested as solutions to mitigate eddy currents induced in the projectile and improve performance

16. Faraday\u27s Law

Lecture slides 16 for Elementary Physics II (PHY 204), taught by Gerhard Müller at the University of Rhode Island. Some of the slides contain figures from the textbook, Paul A. Tipler and Gene Mosca. Physics for Scientists and Engineers, 5th/6th editions. The copyright to these figures is owned by W.H. Freeman. We acknowledge permission from W.H. Freeman to use them on this course web page. The textbook figures are not to be used or copied for any purpose outside this class without direct permission from W.H. Freeman

16. Faraday\u27s law. Motional EMF. Lenz\u27s rule

Lecture slides 16 for Elementary Physics II (PHY 204), taught by Gerhard Müller and Robert Coyne at the University of Rhode Island. Some of the slides contain figures from the textbook, Paul A. Tipler and Gene Mosca. Physics for Scientists and Engineers, 5th/6th editions. The copyright to these figures is owned by W.H. Freeman. We acknowledge permission from W.H. Freeman to use them on this course web page

E3. Themes from slides 12-16 (most) and slides 18-19 (some)

Exam slides 3 for Elementary Physics II (PHY 204), taught by Gerhard Müller and Robert Coyne at the University of Rhode Island. Some of the slides contain figures from the textbook, Paul A. Tipler and Gene Mosca. Physics for Scientists and Engineers, 5th/6th editions. The copyright to these figures is owned by W.H. Freeman. We acknowledge permission from W.H. Freeman to use them on this course web page

E3. Previous Unit Exams 3

Exam slides 3 for Elementary Physics II (PHY 204), taught by Gerhard Müller at the University of Rhode Island. Some of the slides contain figures from the textbook, Paul A. Tipler and Gene Mosca. Physics for Scientists and Engineers, 5th/6th editions. The copyright to these figures is owned by W.H. Freeman. We acknowledge permission from W.H. Freeman to use them on this course web page. The textbook figures are not to be used or copied for any purpose outside this class without direct permission from W.H. Freeman