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- 저자 : Alok Behera (검색결과 4 건)
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Alok Behera,Manjusha M. Thawre,Atul Ballal 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
The application of carbon fiber reinforced polymer (CFRP) Multidirectional (MD) laminates in aircraft structurehave motivated the manufacturers to tailor the mechanical strength in desired directions. The complex stress field owing tomultiple orientations with the loading direction increases the intricacy of failure analysis. Hence, the macroscopic andmicroscopic fracture behaviour of MD CFRP laminates under static loading needs to be explored further. In this study, fourdifferent MD CFRP laminates were fabricated using IMA/M21 prepregs by the autoclaving technique. Effect of fiberorientation on static strength i.e. tensile and compressive strength was studied. The strength decreased with the increase inorientation angle. Scanning electron micrographs revealed that irrespective of the lay-up sequence individual layers failedparallel to the fiber direction. Fiber breakage and delamination were the major failure modes in tensile specimens whilekinking, matrix failure, in-plane shear, stepped fracture, and fiber-matrix debonding were dominated in compressionspecimens. The theoretical and experimental data was in good agreement with the Weibull distribution model.
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Optimal vibration energy harvesting from nonprismatic piezolaminated beam
Alok R Biswal,Tarapada Roy,Rabindra K Behera 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.19 No.4
The present article encompasses a nonlinear finite element (FE) and genetic algorithm (GA) based optimal vibration energy harvesting from nonprismatic piezo-laminated cantilever beams. Three cases of cross section profiles (such as linear, parabolic and cubic) are modelled to analyse the geometric nonlinear effects on the output responses such as displacement, voltage, and power. The simultaneous effects of taper ratios (such as breadth and height taper) on the output power are also studied. The FE based nonlinear dynamic equation of motion has been solved by an implicit integration method (i.e., Newmark method in conjunction with the Newton-Raphson method). Besides this, a real coded GA based constrained optimization scheme has also been proposed to determine the best set of design variables for optimal harvesting of power within the safe limits of beam stress and PZT breakdown voltage.
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Sahoo Alok Kumar,Misra Satyajeet,Behera Bikram Kishore,Srinivasan Anand,Jena Sritam Swarup,Mohanty Manoj Kumar 대한마취통증의학회 2022 Korean Journal of Anesthesiology Vol.75 No.2
Background: Subanesthetic intravenous (IV) ketamine acts as an analgesic and has opioid-sparing effects, particularly for acute postoperative pain; however, its effectiveness in children is understudied. The primary aim of this study was to evaluate the non-inferiority of subanesthetic IV ketamine vs. caudal bupivacaine for postoperative analgesia in children undergoing infraumbilical surgery.Methods: Children aged < 6 years were enrolled in this single-blind study and randomized to receive either subanesthetic IV ketamine (0.3 mg/kg) or caudal 0.125% bupivacaine (1 ml/kg) along with general anesthesia. Postoperative pain was assessed using the FLACC scale at 30 minutes and 1, 2, 3, and 6 h post-operation. Intra- and postoperative opioid consumption, time to extubation, postoperative vomiting, agitation, sedation, and inflammatory markers were also assessed.Results: Altogether, 141 children completed the study (ketamine group: n = 71, caudal group: n = 70) The cumulative proportion of children without significant postoperative pain (FLACC score < 4) in the first 6 h post-surgery was 45.1% in the ketamine group vs. 72.9% in the caudal group (P < 0.001). More children in the ketamine group required an additional dose of intraoperative fentanyl (33.8% vs. 5.7%, P < 0.001) and postoperative tramadol (54.9% vs. 27.1%, P < 0.001). However, postoperative agitation, sedation, and other secondary outcomes were similar between the groups.Conclusions: Subanesthetic ketamine is inferior to caudal bupivacaine for postoperative analgesia in children aged < 6 years undergoing infra-umbilical surgeries; however, other postoperative outcomes are similar.
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Misra Satyajeet,Behera Bikram Kishore,Mitra Jayanta Kumar,Sahoo Alok Kumar,Jena Sritam Swarup,Srinivasan Anand 대한마취통증의학회 2021 Korean Journal of Anesthesiology Vol.74 No.2
Background: Dexmedetomidine, an alpha-2 agonist, has been used for attenuation of hemodynamic response to laryngoscopy but not through the nebulized route. We evaluated the effects of preoperative dexmedetomidine nebulization on the hemodynamic response to laryngoscopy and intubation and examined the intraoperative anesthetic-analgesic requirements and recovery outcomes. Methods: Overall, 120 ASA I & II adult patients (of either gender) undergoing elective surgeries and requiring tracheal intubation, were randomized to receive nebulized dexmedetomidine (1 µg/kg in 3–4 ml of 0.9% saline) or 0.9% saline (3–4 ml), 30 min before anesthesia induction. Heart rate and non-invasive systolic blood pressure were monitored for 10 min following laryngoscopy. Results: After laryngoscopy, linear mixed effect modelling showed significantly lower trend of increase in heart rate in the dexmedetomidine group versus saline (P = 0.012); however, there was no difference in the systolic blood pressure changes between the two groups (P= 0.904). Induction dose of propofol (P < 0.001), intraoperative fentanyl consumption (P = 0.007), and isoflurane requirements (P = 0.013) were significantly lower in the dexmedetomidine group. There was no difference in the 2-h incidence of postoperative nausea and vomiting (PONV) (P = 0.612) or sore-throat (P = 0.741).Conclusions: Nebulized dexmedetomidine at 1 µg/kg attenuated the increase in heart rate but not systolic blood pressure following laryngoscopy and reduced the intraoperative anesthetic and analgesic consumption. There was no effect on early PONV, sore-throat, or increase in incidence of adverse effects. Nebulized dexmedetomidine may represent a favorable alternative to the intravenous route in short duration surgeries.
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