Yazar "Erol, A." seçeneğine göre listele

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  • Küçük Resim Yok
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    The Effect of Sintering Heating on Mechanical Properties of Brick Clays [Tuğla Killerinde Sinterleme Sıcaklığının Mekanik Özelliklere Etkisi]
    (2002) Demir, I.; Orhan, Mehmet; Erol, A.; Dorum, Atila
    Sintering process occupies 60-70% of total production costs during the manufacturing of bricks. In this work, specimens were produced at various temperatures in electrical furnace and physical properties such as plasticity, shrinkage, loss of ignition, density and porosity, water absorption and mechanical properties such as freezing resistance, compressive strength, and other mechanical tests were investigated. Specimens were fired at 800°C did not meet standard mechanical properties. On the other hand, specimens were fired at 900°C shoved higher compressive strength and other specimens also met the standard mechanical requirements. As a result, mechanical properties were found to be greatly affected by the firing temperature of brick.
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    Remifentanil-sevoflurane-nitrous Oxide Anaesthesia: the Effects of Propofol or Thiopentone on Early Cognitive Function and Recovery in Moderate Aged and Elderly Women [remifentanil-sevofluran-azotprotoksit Anestezisinde Propofol ve Tiyopenton'un Orta ve ileri Yaştaki Kadinlarda Derlenmeye ve Erken Kognitif Fonksiyonlara Etkisi]
    (2002) Öztin, Öğün Cemile; Topal, Ali; Duman, Ateş; Erol, A.; Ökeşli, Selmin
    In this study, we investigated the cognitive functions and recovery following thiopentone or propofol induction before remifentanil and sevoflurane-nitrous oxide anaesthesia, in patients undergoing total abdominal hysterectomy operations. In 67 ASA I-III class women (age:40-76), anaesthesia was induced with 1,5 mg/kg propofol in Group PR (n=31), and 5 mg/kg thiopentone in Group TR (n=36). Mivacurium was used for muscle relaxation. Anaesthesia was maintained with 0.25 ?/kg/h remifentanil, and a mixture of 0.5 MAC sevoflurane-nitrous oxide: oxygen (60:40). Heart rate (HR.), mean arterial pressure (MAP), respiratory rate (RR) and SpO2 were recorded. Mini-mental test (MMT), postanaesthesia Aldrete scoring (PAS) pain scores using visual analog scale (VAS) with the changing times of sedation scores using 4 point sedation scale were recorded simultaneousely. In group PR HR and MAP decreased after induction. In both groups MMT scores were lower than their preopertive values and MMT scores were decreased in group TR when compared to group PR postoperatively. (Preoperatively 23.1±3.7 vs 23.3±4.9, postoperatively 17.1±5.7 vs 14.0±6.0) (p<0.05). MMT application time was longer than Group PR. (p<O.05). In group TR, PAS scores were more decreased (Group TR: 7.2±1.3 and 9.0±0.9; Group PR: 8.3±1.3 and 9.6±0.5) (p<0.05). VAS scores were higher in Group TR. The incidence of postoperative nausea-vomiting was lower in Group PR (p<0.05). Thiopentone used for induction before nitrousoxide-remifentanil-sevoflurane anaesthesia considerably prolonged the return of early cognitive functions and recovery time in middle-advanced aged women when compared with propofol.