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Strength and durability properties of concrete using incinerated biomedical waste ash
Kailash Narayan Katare,Nitin Kumar Samaiya,Yogesh IyerMurthy 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.2
Biomedical waste is a collection of medical waste from diverse sources that pose a major risk to human, plant, or animal life now or in the future. It cannot be processed or discarded off without proper processing. Biomedical waste is often burnt in incineration plants, yielding Incinerated Biomedical Waste Ash (IBMW) which is disposed off in landfills, which are not completely leak-proof. The impact of IBMW ash as cement replacement on the strength and permeability properties of concrete is discussed in this research. For comparison, a control concrete mix is created, as well as five concrete mixes with varying percentages of IBMW (2.5, 5.0, 7.5, 10 and 12.5%). Lime reactivity test suggests marginal pozzolanic activity of IBMW. The experimental study results suggest that including 7.5% IBMW as a partial cement replacement improves the compressive strength by 20%; improves the split tensile strength by 17% and flexural strength by 14% compared to control mix in 28 days. Compressive, split tensile and flexural strength tests is performed up to 90 days of age, and water absorption, sorptivity, and leachate analyses is performed up to 28 days of age. The Toxicity Characteristic Leaching Procedure (TCLP) test was also carried out and is discussed.
Dynamic balancing of planar mechanisms using genetic algorithm
Kailash Chaudhary,Himanshu Chaudhary 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10
This paper presents an optimization technique to dynamically balance the planar mechanisms in which the shaking forces and shakingmoments are minimized using the genetic algorithm (GA). A dynamically equivalent system of point-masses that represents each rigidlink of a mechanism is developed to represent link’s inertial properties. The shaking force and shaking moment are then expressed interms of the point-mass parameters which are taken as the design variables. These design variables are brought into the optimizationscheme to reduce the shaking force and shaking moment. This formulates the objective function which optimizes the mass distribution ofeach link. First, the problem is formulated as a single objective optimization problem for which the genetic algorithm produces betterresults as compared to the conventional optimization algorithm. The same problem is then formulated as a multi-objective optimizationproblem and multiple optimal solutions are created as a Pareto front by using the genetic algorithm. The masses and inertias of the optimizedlinks are computed from the optimized design variables. The effectiveness of the proposed methodology is shown by applying it toa standard problem of four-bar planar mechanism available in the literature.
Kailash Chand Kurdia,Ambuj Aggarwal,Cherring Tandup,Divya Dahiya,Subrata Podder,Arunanshu Behera 한국간담췌외과학회 2021 Annals of hepato-biliary-pancreatic surgery Vol.25 No.2
Extrahepatic portal venous obstruction (EHPVO) and temporomandibular joint (TMJ) ankylosisis are significant problems in Asian countries. Both EHPVO and bilateral TMJ ankylosis may have rare association due to protein C and S deficiency which may cause hypercoagulability as well as reduced fibrinolytic activity. Ankylosis arising in early childhood is associated with facial asymmetry, feeding difficulty and speech development alterations. It is also associated with great challenges of endoscopic management in extra hepatic portal vein obstruction (EHPVO) with variceal bleed as well as air way management during surgical management and post-operative recovery. Recently a case series had shown association of TMJ ankylosis with EHPVO due to protein C deficiency which might be an etiological factor for both EHPVO as well as TMJ ankylosis. This case report documents a case of 14 year young girl who had TMJ ankylosis due to ear infection and EHPVO with esophageal varices had multiple episodes of upper GI bleed with mild deficiency of protein C and S, successfully managed with proximal splenorenal shunt to prevent further episodes of upper GI bleed, as endoscopic management is not feasible due to TMJ ankylosis.
Structural Vibration Control for Broadband Noise Attenuation in Enclosures
Kailash Krishnaswamy,Rajesh Rajamani,Jong Jin Woo,Young Man Cho 대한기계학회 2005 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.19 No.7
This paper develops and evaluates several strategies for structural vibration control with the objective of attenuating broadband noise inside a rectangular enclosure. The strategies evaluated include model-independent collocated control, model-based feedback control and a new "modal-estimate" feedback strategy. Collocated control requires no knowledge of model parameters and enjoys the advantage of robustness. However, effective broadband noise attenuation with co located control requires a large number of sensor-actuator pairs. Model-based controllers, on the other hand, can be theoretically effective even with the use of a single actuator. However, they suffer from a lack of robustness and are unsuitable from a practical point of view for broadband structural vibration applications where the dynamic models are of large order and poorly known. A new control strategy is developed based on attenuating a few structural vibration modes that have the best coupling with the enclosure acoustics. Broadband attenuation of these important modes can be achieved using a single actuator, a limited number of accelerometers and limited knowledge of a few modal functions. Simulation results are presented to demonstrate the effectiveness of the developed strategy.