In recent years, the industry has shifted toward down-sizing and turbo-charging spark ignition (SI) engines in an effort to increase fuel conversion efficiency. However, this has given rise to a destructive phenomenon known as sporadic pre-ignition (SPI). At low cranking speeds and high loads, engines have been observed to knock violently for brief and infrequent intervals. If allowed to contin...

Synthesis of novel pyrazole-fused heterocycles, i.e., dihydro-1Hor 2H-oxepino[3,2c]pyrazoles (6 or 7) from 4-allyloxy-1H-pyrazoles (1) via combination of Claisen rearrangement and ring-closing metathesis (RCM) has been achieved. A suitable catalyst for the RCM of 5-allyl-4allyloxy-1H-pyrazoles (4) was proved to be the Grubbs second generation catalyst (Grubbs2nd) to give the predicted RCM produ...

A regional climate simulation over the Iberian Peninsula for the last millennium J. J. Gómez-Navarro, J. P. Montávez, S. Jerez, P. Jiménez-Guerrero, R. Lorente-Plazas, J. F. González-Rouco, and E. Zorita Departamento de Fı́sica, Universidad de Murcia, Murcia, Spain Departamento de Astrof́ısica y CC. de la Atmósfera, Universidad Complutense de Madrid, Madrid, Spain GKSS Research Centre, Geesthacht...

Corresponding Author: Hassana Mahfoud Faculty of Sciences and Techniques, Mechanical Engineering Laboratory, Sidi Mohammed Ben Abdellah University, B.P. 2202-Route d’Imouzzer-Fes, Morocco Email: [email protected] Abstract: Clinical engineering departments have to establish and continuously regulate a Medical Equipment Management Program (MEMP) to ensure a high reliability and safety o...

For bistatic forward-looking synthetic aperture radar (BFSAR), images are often blurred by uncompensated radar motion errors. To get refocused images, autofocus is a useful postprocessing technique. However, a severe drawback of the autofocus algorithms is that they are only capable of removing one-dimensional azimuth phase errors. In BFSAR, motion errors and approximations of imaging algorithm...

Reliability, availability, maintenance and safety (RAMS) analysis is essential in the evaluation of safety critical systems like nuclear power plants and the railway infrastructure. A widely used methodology within RAMS analysis are fault trees, representing failure propagations throughout a system. We present DFTCalc, a tool-set to conduct quantitative analysis on dynamic fault trees including...

This paper reports a modular robotic system currently in development for performing intra-operative 3-D ultrasound scans. The final goal is to be able to utilize ultrasound as a guidance and imaging modality for a variety of computer integrated surgery applications by overcoming the limits it’s handheld nature presents. The primary component of the system is a compact 3 DOF robot called the Tra...

This paper presents the Random-Cluster Model (RCM), a stochastic time-variant, frequency-selective, propagation-based MIMO channel model that is directly parametrised from measurements. Using a fully automated algorithm, multipath clusters are identified from measurement data without user intervention. The cluster parameters are then used to define the propagation environment in the RCM. In thi...

In this paper, we propose a new execution trace driven simulation technique, called the Resource Conflict Methodology (RCM), for modeling and simulating computer systems early in the design cycle. By using a simplified hardware element model which allows the user to easily add or delete hardware elements in the model, RCM allows the user to readily change the machine design being investigated a...

Global and regional climate models are deterministic physical models which provide predictions of,amongst other things, future temperatures under a range of climate change scenarios. Predictions are available on grids with cells ranging from XX to YY (GCM) and XX to YY (RCM). The way in which these models are fitted means that they are often good at predicting changes in the mean temperature, b...