iosr-Jm   Volume-17 ~ Issue-2 ~ Mar. – Apr. 2021

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Abstract: Oil-based lubricants with nanoparticle additives perform better in high-temperature applications compared to pure ones. High temperatures accelerate the decomposition of pure oil-based lubricants limiting their use. The use of nanoparticle enhanced lubricants (nanolubricants) is advantageous in maintaining a lower coefficient of friction, improving load-bearing capacity, and improving friction and wear resistance as opposed to pure lubricants. The current paper examines three different hybrid nanoparticle combinations......

Keywords: Hybrid nanofluids, Nanolubricants, Magnetohydrodynamic (MHD) flow.

[1] A. J. S. Egea, V. Martynenko, G. Abate, N. Deferrari, D. M. Krahmer, and L. N. L. de Lacalle, "Friction capabilities of graphite-based lubricants at room and over 1400 K temperatures," Int. J. Adv. Manuf. Technol., vol. 102, no. 5, pp. 1623–1633, 2019.
[2] H. Han, Z. Qian, F. Meng, and Z. Cui, "Tribological performances of graphite–MoS2 coating at various high temperatures:," Proc. Inst. Mech. Eng. Part J J. Eng. Tribol., vol. 233, no. 12, pp. 1888–1902, 2019.
[3] J. R. Lince, "Effective Application of Solid Lubricants in Spacecraft Mechanisms," Lubricants, vol. 8, no. 7, p. 74, 2020.
[4] A. Mohamed, S. Ali, T. A. Osman, and B. M. Kamel, "Development and manufacturing an automated lubrication machine test for nano grease," J. Mater. Res. Technol., vol. 9, no. 2, pp. 2054–2062, 2020.
[5] M. K. A. Ali, X. Hou, and M. A. A. Abdelkareem, "Anti-wear properties evaluation of frictional sliding interfaces in automobile engines lubricated by copper/graphene nanolubricants," Friction, vol. 8, no. 5, pp. 905–916, 2019.

Abstract: In this paper, we make an empirical analysis of the COVID-19 epidemic in Hong Kong based on the dynamic transmission rate model. First, through visual analysis, we find the three main stages of the development of the COVID-19 epidemic in Hong Kong. Furthermore, based on data driving, a suitable sliding window period is selected, and a three-parameter power function is used to perform nonlinear weighted fitting of the dynamic transmission rate. Finally, the inflection point of three rounds of the COVID-19 epidemic in Hong Kong and existing confirmed cases within 7 days after the date where selected data set ends are predicted. Experiments show that the empirical analysis results of this article are more accurate..

Keywords: COVID-19, Dynamic transmission rate, Nonlinear weighted fitting, Inflection point, Infectious diseases

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originating in Wuhan, China: a modelling study, Lancet, 2020, 395(10225): 689–697.
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Abstract: This paper aims to show the influence of infectious disease inpredator-preysystem. In the present work, a four Compartment mathematical eco-epidemiology modelis formulated which contain susceptible predator-prey, infected predator-prey populations are Considered and analyzed with the assumption that infected predators are not involved in predation.The positivity, boundedness,and existence ofthe solutionof the system are Studied.Equilibrium points of the model equations are identified. Local and Global Stability analysis has beenperformed. The basic reproduction number for infected prey and infected predator at disease free equilibrium point and respectively. Finaly,Numerical simulations are presentedto clarify results.

Keywords: Mathematical eco-epidemiology,prey-predatorsystem,Stability Analysis,Reproduction Number,Simulation .

[1] Raid Kamel Naji, Rasha Ali Hamodi, The dynamics of an ecological model with infectious disease, Global Journal of Engineering Science and Researches.Raji,3(8): August 2016 DOI: 10.5281/zenodo.61221
[2] Karrar Qahtan Khalaf, Azhar Abbas Majeed, and Raid Kamel Naji.The Local Bifurcation and the Hopf Bifurcation for EcoEpidemiological System with One Infectious Disease,Gen. Math. Notes, Vol. 31, No. 1, November 2015, pp. 18-41.Available free online at http://www.geman.in
[3] Raid Kamel Naji, Kawa Ahmed Hasan. The Dynamics of Prey-Predator Model With Disease In Prey,J. Math. Comput. Sci. 2 (2012), No. 4, 1052-1072,Available online at http://scik.org
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[5] Sachin Kumar and Harsha Kharbanda. Stability Analysis Of Prey-Predator Model With Infection, Migration and Vaccination In Prey,arXiv:1709.10319vl [math.DS], 29 Sep 2017.

Abstract: When Corona Virus emerged in Wuhan China in 2019, several Nations, including the very technologically advanced, nay, the world powers received the news with indifference, referring to it as 'China's affair'. But like the Nazis movement in Germany that snow-balled into the Second World War and its holocaust trademark, the virus soon gained International recognition as a pandemic that beat hollow the boastful capacity of the World Health Organization and all subscribing Nations. The poor handling of the scourge by most nations and the volume of casualty and fatality before the world purported to evolve vaccines against the virus show that the world today is as unprepared to contain certain emergencies as happened in the events leading to the Second World War. By doctrinal approach therefore, this paper deciphered why it took the world such intensive but rather late effort to find solution......

Key Words: Human Rights, Threat, Humanity, Management of Covid-19, and Unanswered Questions.

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