Sir,?I should like to hear the opinion of some of your readers about the value of disinfectants. Are they any good at all, or might we not just as well pour our money down the drain? Of course, I think that steam disinfection is very useful, but are any of the other ways of disinfecting any good to prevent the spread of disease, or are they only " eye-wash "? I enclose a stamped addressed envel...

in today's economy of knowledge and globalization, innovation as the ability to apply new knowledge to improve the production process and create new goods and services has been recognized as an undeniable efficiency. a dynamic economy is in need of efficient human capital which includes elites, professionals and entrepreneurs to come up with innovative and competitive ideas. brain drain in some...

in some climates, massive buildings made of stone, masonry, concrete, earth and … can be utilized as one of the simplest and most effective ways of reducing building heating and cooling loads. very often such savings could be achieved in the design stage of the building and with a relatively low-cost. such declines in building envelope heat losses combined with optimized material configuration ...

Sand envelopes have often been used in conjunction with conventional subsurface pipes to improve the drainage of soils in the sugar industry. The expense and effort required to implement these are only justified if this practice results in significantly improved drainage, and it was therefore important to establish whether a sand envelope is effective in all soils. Four observation trials were ...

This paper presents behavioral modeling of an envelope tracking (ET) power amplifier (PA) excited by an slewrate limited envelope. In order to relax the slew-rate requirements of current efficient envelope amplifiers (EA), we can drive the ET PA with a slower version of the signal’s envelope. However, the resulting amplified signal suffers from nonlinear distortion due to the time-variant gain ...