ABSTRACT
This review article focuses on the aluminum-based metal matrix composites (Al-based MMCs). Studies or investigations of their mechanical and tribological properties performed by researchers worldwide in the past are presented in detail. The processing techniques and applications for Al-based MMCs are also documented here. A brief background on the composite materials, their constituents, and their classification, as well as the different matrix materials and particulates used in Al-based MMCs, can be found in this review. Then, an overview of dual-particle-size reinforced composites, heat treatment of Al alloys, and temper designations used in heat treatment are also included. In addition, the factors influencing the mechanical and wear properties of Al-based MMCs are discussed. The primary objective is that both present and future researchers and investigators will be assisted by the comprehensive knowledge compiled in this article to further explore and work towards the betterment of society in general.
ABSTRACT
Our objective was to determine the trends of providing intraoperative analgesia for day-care surgery among the various anaesthesiologists at our university hospital. All patients having surgical procedures under general anaesthesia in the Surgical Day Care Unit (SDC) of the Hospital were included. The study was done over two months and 142 patients were enrolled during the study period. Of these 45% received pethidine for intraoperative analgesia, 24% pethidine and ketorolac, 6% pethidine and paracetamol suppositories, 18% received fentanyl, 2% tramadol and 5% received other analgesic combinations. Of the 22% patients who received pethidine intraoperatively needed rescue analgesia in recovery room, while 12% of those receiving a combination of pethidine and ketorolac needed rescue analgesia. Pethidine was found to be the most commonly used analgesic agent while a combination of pethidine and ketorolac was found to provide a superior quality of analgesia with a lesser need of additional analgesia.
