Desorption and subsequent rehydrogenation of Mg(BH4)2 with and without 5 mol % TiF3 and ScCl3 have been investigated. Temperature programmed desorption (TPD) experiments revealed a significant increase in the rate of desorption as well as the weight percentage of hydrogen released with additives upon heating to 300 °C. Stable Mg(BxHy)n intermediates were formed at 300 °C, whereas MgB2 was the m...

AODV routing protocol is intended for use by mobile nodes in adhoc wireless networks. Even though it performs well in static and low-mobility environments, the performance degrades rapidly with increasing mobility. Our primary concern is to enhance the performance of AODV by reducing the volume of the control packets like RREQ and RREP during the route discovery process effectively due to the n...

We propose a new framework for the experimental study of periodic, quasiperiodic and recurrent dynamical systems. These behaviors express themselves as topological features which we detect using persistent cohomology. The resulting 1-cocycles yield circle-valued coordinates associated to the recurrent behavior. We demonstrate how to use these coordinates to perform fundamental tasks like period...

Excessive voltage drops in power and ground (P&G) buses of CMOS VLSI circuits can severely degrade both design reliability and performance. Maximum current estimates are needed in the circuit to accurately determine the impact of these problems. In [1], a pattern-independent, linear time algorithm (iMax) is described that is very e ective in estimating the maximum current waveforms at various c...

The purpose of this paper is to provide insight into how rural teachers were empowered to become co-creators of innovative practices in their classrooms. The co-creation was operationalised as a merging of teachers existing knowledge of their subject, context and new knowledge of using mobile tablets towards enhancing their teaching practices in the Eastern Cape Province of South Africa over a ...

This paper presents two algorithms for mutual exclusion on optical bus architectures including the folded one-dimensional bus, the one-dimensional array with pipeleined buses (1D APPB), and the twodimensional array with pipelined buses (2D APPB). The rst algorithm guarantees mutual exclusion, while the second guarantees both mutual exclusion and fairness. Both algorithms exploit the predictabil...

A special case of optical aperture synthesis, homothetic mapping, is the topic of this paper. It allows for a wide field of view for interferometric instruments, interesting for astrometric measurments of wide objects. This paper describes a testbed constructed and tested in TNO-TPD in Delft (the Netherlands). This testbed is intended as a tool to investigate the ins and outs of homothetic mapp...

An architectural design for high speed residential data access using the traditional IEEE 802.3 medium access protocol over the existing CATV network is proposed. The described architecture is attractive in using the existing infrastructure combined with the exisiting access scheme in the residential area and thus it is cost effective and well suited for home internet access. However, the tradi...

The identiication of sensitizable paths and the determination of path delays play key roles in many delay fault testing schemes. In this paper we examine a range of gate delay models with respect to their impact on identifying both sensitizable paths and maximum circuit delays in com-binational logic circuits. We provide recommendations on the \minimum acceptable" model for identifying critical...

In the deep sub micrometer CMOS process technology, the interconnect resistance, length, and interwire capacitance are increasing significantly, which contribute to large on-chip interconnect propagation delay. Data transmitted over interconnect determine the propagation delay and the delay is very significant when adjacent wires are transitioning in opposite directions (i.e., crosstalk transit...