iosr-JMCE   Volume-20 ~ Issue-1 ~ Jan. – Feb. 2023

Abstract: The use of composites in various industries, particularly the aerospace sector, has experienced a significant growth due to their exceptional mechanical properties. Drilling woven composite components is a common operation in assembly, making it essential to choose the optimal process parameters and tool geometry to avoid drilling-induced damage, such as delamination. This study introduces a new mathematical model to predict the critical thrust force at which delamination begins. The model considers the impact of thermo-mechanical loads and the mixed-mode fracture that occurs in the delamination zone for unidirectional composites. The proposed model has.......

Keywords: Delamination, feed rate, drilling, critical thrust force, torque

[1]. DeGarmo, E.; Black, J.; Kohser, R. Materials and Processes in Manufacturing; Wiley: Hoboken, NJ, USA, 2003.
[2]. Faraz, A.; Biermann, D.; Weinert, K. Cutting edge rounding: An innovative tool wear criterion in drilling CFRP composite laminates. Int. J. Mach. Tools Manuf. 2009, 49, 1185–1196. [CrossRef]
[3]. Zitoune, R.; Crouzeix, L.; Collombet, F.; Tamine, T.; Grunevald, Y. Behaviour of composite plates with drilled and moulded hole under tensile load. Compos. Struct. 2011, 93, 2384–2391. [CrossRef]
[4]. Karata¸s, M.A.; Gökkaya, H. A review on machinability of carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP) composite materials. Def. Technol. 2018, 14, 318–326, Composite Materials in Defence Technology. [CrossRef]
[5]. Wang, H.; Zhang, H.; Goto, K.; Watanabe, I.; Kitazawa, H.; Kawai, M.; Mamiya, H.; Fujita, D. Thrust mapping reveals extrinsic toughening of brittle carbon fiber in polymer matrix. Sci. Technol. Adv. Mater. 2020, 21, 267–277. [CrossRef]

Abstract: Samarinda is a city that is in the developing stage and builds a city where development Samarinda positive look towards the city in the form of improved infrastructure facilities and infrastructure to enhance economic development, while the development of the city of Samarinda toward negative occurrence or minimize the reduction of open space and its ecological function as preparation of the land for housing, land clearing mines coal and others that decrease the water catchment areas causing flooding or inundation........

Keywords: Space Evidenced, Water Catchment Areas

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Abstract: Background: This paper seeks to put a light spot on the Global Navigation Satellite System (GNSS) features coming with smartphones and, by consequence, relate them to Geographic Information System (GIS) and Google Earth Engine (GEE). Materials and Methods: This is done through performing cadastre for a real dataset extending in area of about 400×260 m. The dataset consists of 6 tracks (about 130 m length for each) extending in East-West direction and 6 tracks (about 200 m length for each) extending in North-South direction. First, GNSS data for different tracks were collected utilizing SW Maps® smartphone application via moving along desired tracks at average speed of 1.5 m/sec. Results: Then.....

Key Word:GNSS; GPS; GIS; Google Earth Engine; Tracking Surveying; Routing Surveying; Smartphone Surveying.

[1]. M. Aldelgawy, M. A. Abo-Hashema and M. M. Radwan, "Integrating GPS and GIS Technologies to Enhance Pavement Management System Process: A Case Study," Advances in Transportation Studies, vol. 58, pp. 105-120, 2022.
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Abstract: This article presents information about facades, their thermal insulating role in buildings in Albania. The facade in construction is one of the necessary factors to ensure a longer life of the buildings and indoor thermal comfort. Facade systems are composed of different materials, which provide a protective effect during the life of the building. The article will focus on the characteristic materials used in Albania for the construction of facades and the main materials used from the year 2000 up to today. The article will be informative, statistical and comparative in order to draw conclusions.......

Key Word: facades, thermal insulation, ventilated facades, minimal energy, decorative.

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Abstract: This paper aims to investigate the potential use of Hydrofluoroolefin (HFO) blended with Hydro fluorocarbons (HFC) as a less GWP refrigerant in a water chiller system. An experimental setup of water chiller with a capacity of 1TR was used to evaluate the effect of Evaporator temperature with R1234yf/R134a blend of 60/40% ratio. The evaluation was based on several characteristics such as the condenser temperature, evaporator temperature, work done by the compressor, coefficient of performance (COP), and Refrigerant flow rate. The Test results showed that the blend's evaporator temperature is adequate when compared to R134a, R410a. While the Blend's low GWP of 574 was better than R134a and R410a. The study concludes that the use of HFO blend with HFC group refrigerant can be a promising solution to achieve low GWP refrigerants in the field of refrigeration systems.

Key Word: HFO, HFC, R1234yf, COP, ODP, GWP, BLEND

[1]. Juan J.G. Pabon , Ali Khosravi , J.M. Belman-Flores , Luiz Machado , Remi Revellin , Applications of refrigerant R1234yf in heating, air conditioning and refrigeration systems: A decade of researches, International Journal of Refrigeration (2020).
[2]. C. Aprea, A. Greco, A.Maiorino, An experimental investigation of the energetic performances of HFO1234yf and its binary mixtures with HFC134a in a household refrigerator, International journal of refrigeration76, pp:109-117, 2017.
[3]. Ali Khalid Shaker Al-Sayyab, Joaquln Navarro-Esbrl, Angel Barrag an-Cervera, Sarah Kim, Adrian Mota-Babiloni , Comprehensive experimental evaluation of R1234yf-based low GWP working fluids for refrigeration and heat pumps, Energy Conversion and Management 258,115378, 2022.
[4]. Gaurav and R. Kumar, Computational energy and exergy analysis of R134a, R1234yf, R1234ze and their mixtures in vapour compression system, Ain Shams Engineering Journal.
[5]. Zhaohua Li, Kun Liang, Hanying Jiang, Experimental study of R1234yf as a drop-in replacement for R134a in an oil free refrigeration system, Applied Thermal Engineering 153 646–654, 2019

Abstract: This experimental study investigates the use of an integrated downdraft gasifier for heating and power applications, using segregated dry municipal solid waste (SDMSW) and biomass blends. The study aims to evaluate the gasification performance and to develop an efficient gas-cleaning system to achieve tar-free producer gas. Background: The proper management of solid waste has become a critical concern in modern times due to its significant impact on the environment and human health. Segregated Dry Municipal Solid Waste (SDMSW) is a type of solid waste that has potential as a renewable energy resource, but its management and disposal have been a challenge for municipalities. The integration of SDMSW with biomass in a downdraft gasifier has been suggested as a viable solution........

Keywords: Downdraft gasifier, Co-gasification, producer gas, mechanical filtration, Syngas

[1]. Naga Sarada Somanchi, Ravi Gugulothu, Sri Lalitha Swathi Sagi, Thotakura Ashish Kumar, and Koneru Vijaya, "Experimental study of solar water distillation using epsom salt as phase change material", Proceedings of 4th International Conference on Hydrology and watershed management with a focal theme on Ecosystem Resilience-Rural and Urban Water Requirements on 29th October to 01st November, 2014, pp: 470-474.
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Abstract: The provision of quality and refined disease diagnosis in remote and underserved areas has been one of the greatest challenges because most of the time healthcare infrastructure is minimal or none. Artificial intelligence (AI) has brought revolutionary changes in terms of scalable and real-time diagnostic systems that can fill vital healthcare gaps. This paper will examine how the AI-driven diagnostic platforms to be created could be implemented in low-resource environments and help identify diseases in real time. By combining recent developments in telemedicine, machine learning, as well as mobile health (mHealth), we assess how such platforms work, what is their diagnostic quality, and whether they can be successfully deployed in the field........

Keywords: Artificial Intelligence (AI), AI-enabled diagnostics, Disease detection, Real-time diagnosis, Remote healthcare.

[1]. Arshad, M. F., Burrai, G. P., Varcasia, A., Sini, M. F., Ahmed, F., Lai, G., … Parpaglia, M. L. P. (2024, April 1). The groundbreaking impact of digitalization and artificial intelligence in sheep farming. Research in Veterinary Science. Elsevier B.V. https://doi.org/10.1016/j.rvsc.2024.105197
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