منابع مشابه
Still evolving (after all these years).
[1] Humans are willful creatures. No other species on this planet has gained so much mastery over its own fate. We have neutralized countless threats that once killed us in the millions: we have learned to protect ourselves from the elements and predators in the wild; we have developed cures and treatments for many deadly diseases; we have transformed the small gardens of our agrarian ancestors...
متن کاملAre electronic cardiac devices still evolving?
OBJECTIVES The goal of this paper is to review some important issues occurring during the past year in Implantable devices. METHODS First cardiac implantable device was proposed to maintain an adequate heart rate, either because the heart's natural pacemaker is not fast enough, or there is a block in the heart's electrical conduction system. During the last forty years, pacemakers have evolve...
متن کاملTotal hip arthroplasty: a still evolving technique☆
It has been advocated that total hip arthroplasty (THA) is probably the most successful surgical intervention performed in Medicine. In the 1960s, Sir John Charnley not only introduced, but also modified and improved the technique of cemented arthroplasties. The concepts on biological fixation established by Pillar and Galante served as the foundation for the development of uncemented implants ...
متن کاملHm - OPTIMAL CONTROLLER DISCRETIZATION
A redesign method for discretizing a continuous-time controller is proposed. The resulting hybrid control system, for example with continuous-time plant and discrete-time controller, is stable, and performance including the system's inter-sampling behaviour can be optimized by approximating some chosen reference transfer function of the continuous-time control system. In order to obtain a tract...
متن کاملThirty Years of VCOT Publication and Still Evolving.
This final issue of Veterinary and Comparative Orthopaedics and Traumatology for 2017 represents anothermilestone,with thirty years of uninterrupted publication of the Journal. In the first twenty years we published four issues a year, then six issues a year in the recent ten years. That’s a total of 140 issues, or roughly 1,500 papers published over the life of the journal. Starting out in 198...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1990
ISSN: 0252-9211
DOI: 10.1017/s0252921100069013