Design of a ferrite rod antenna for harvesting energy from medium wave broadcast signals

Radio frequency (RF) energy harvesting is an emerging technology that has the potential to eliminate the need for batteries and reduce maintenance costs of sensing applications. The antenna is one of the critical components that determines its performance and while antenna design has been well researched for the purpose of communication, the design for RF energy harvesting applications has not been widely addressed. The authors present an optimised design for such an antenna for harvesting energy from medium wave broadcast transmissions. They derive and use a model for computing the optimal antenna configuration given application requirements on output voltage and power, material costs and physical dimensions. Design requirements for powering autonomous smart meters have been considered. The proposed approach was used to obtain the antenna configuration that is able to deliver 1 mW of power to 1 kΩ load at a distance of up to 9 km, sufficient to replace batteries on low-power sensing applications. Measurements using a prototype device have been used to verify the authors simulations

Synthesis of amino acid derivatives of neamine and 2-Deoxystreptamine to be used as mutasynthons

6‘-N derivatives of neamine with alanine, phenylalanine and lysine were synthesized either using an active esters method in one step under controlled conditions, or using a mixed anhydride method after blocking every functional group of neamine and leaving the 6’-amino group free to react. Similarly N.N- diamino acid and monoamino acid derivatives of 2-deoxystrept-amine were synthesized. © 1991, Taylor & Francis Group, LLC. All rights reserved

Total synthesis of 4-(d-alanylamino)-2-amino-2,3,4-trideoxy-dl-threo-pentose (3-deoxy-dl-prumycin)

3-Deoxy-dl-prumycin (1) was synthesized from 2-furanmethanol (2-furfuryl alcohol, 2) in eleven steps in 15% total yield. Michael addition of azide anion to 2,3-dideoxy-dl-pent-2-enopyranos-4-ulose (3) and reduction in situ of the adduct afforded the key intermediates 5 and 6. Introduction of a second azido group with inversion of configuration at C-4 afforded intermediates 14 and 17, both of which had a threo configuration in regard to C-2 and C-4. Coupling with d-alanine and total deprotection yielded the title compound 1. © 1991

Resolution of 2, 3-Dideoxy-Dl-2-Enopyranos-4-Uloses via chromatographic separation of their diastereomeric O-Tert-Butyloxycarbonyl-L-Alanyl esters. A convenient synthesis of L- and D-Aculose 1.

A simple and effective procedure for the resolution of 2, 3-dideoxy-DL-2-enopyranos-4- uloses is presented. This procedure is based on column chromatographic separation of their diastereomeric 0-(N-rm-butyloxycarbonyl)-L-alanyl esters, followed by mild acidic cleavage of the ester function. L-Aculosc, 2, 3, 6-tridcoxy-L-glycero-hcx-2-cnopyranos-4-ulosc, is also prepared in satisfactory yield. © 1991, Taylor & Francis Group, LLC. All rights reserved

Multiprocessor interrupting and synchronizing concepts in the parallel SIMULA machine and their representation by Petri-Nets

Large-scale discrete time simulation is an application area which demands high speed processing. This specific application area requires the design of new machine architectures which are feasible as a result of the current technological advances. These machine architectures can be implemented by multiprocessor structures so as to provide high performance by exploiting parallelism which characterizes many dynamic simulation models. SIMULA 67 is a powerful general purpose programming language which includes features for advanced and complex software simulation products. The process structure of SIMULA allows for the definition of concurrent tasks which can be executed in parallel by a multiprocessor configuration. Such configurations support a high degree of synchronization and interrupt mechanisms to control the evolution of parallel processes. This paper elaborates the synchronizing and interrupting concepts incorporated in the design of a parallel SIMULA machine and represents these concepts by their corresponding Petri-Net equivalents. © 1985

The use of the Strecker reaction for the synthesis of sympathomimetic amine analogues and their cis-Pt(II) complexes

New amines, designed to satisfy the necessary structural requirements in order to be sympathomimetic, have been prepared via the Strecker reaction and subsequent hydrogenation of several carbonyl compounds [1,2]. We have also synthesized the cis-Pt(II) complexes of the above sympathomimetic amine analogues and tested their anti-tumor properties. Furthermore, the new amines show anti-bacterial activity, in contrast with their biological analogues and the starting materials which were inactive. © 1987