International Journals of Multidisciplinary
Research Academy (IJMRA)

Abstract:
Proportional-Derivative-Integral control has been a dominant strategy used in industry to control temperature and other processes. However, their use in simple appliances such as electric kettle has not been widespread. With the increasing concern for energy and convenience, attention is being focused on how to develop simple and cost efficient controllers that will reduce energy waste. In this study, a mathematical model of an electric kettle is developed using the lumped parameter model. The characteristics transfer function of the system was obtained using the open-response characteristics. A PID controller was then designed for the process while MATLAB Simulink model was developed. The model was then simulated. The results show increase in overshoot from 5%−12.5%, rise time 230−300 seconds, settling time 720−750 seconds and zero steady-state error between 50 oC−80 oC.
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Abstract:
Complexes of Pt(II) and Ru(II)1 ions made from a Schiff base ligand derived from 2- hydroxy-1-naphthaldehyde and 4-amino-3-mercepto-5-propyl-1,2,4-triazole were synthesized. Characterization was done on the basis of some physicochemical parameters; infrared and uv-visible spectroscopic studies. The ligand acted as a bidentate molecule coordinating through NS heteroatoms to Pt(II) ion and as a tridentate coordinating through NSO donor atoms to Ru(II) ion. The experimental data obtained were in affirmation with many documented literatures that revealed the complexes to exist as square planar and octahedral geometrical configurations for Pt(II) and Ru(II)ions respectively. The synthesized chelates were screened against some species of bacteria such as Staphylococcus aureus, Streptococcus pyrogones, and fungi such as Candida albican and Aspergillus Niger using the disc diffusion method and broth agar method. The metal complexes showed better potency as antimicrobial agents than the free ligand and even when compared to the standard, they fair better and therefore, can serve as effective drugs against these pathogens
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Abstract:
By weakening the correlation between variables,the general multivariate linear regression model is improved.Based on the improved multivariate linear regression analysis, a regression model of civil aviation passenger volume is2154 established.And the regression model of civil aviation passenger volume gives the influence of different influencing factors on civil aviation passenger volume, and forecasts the passenger volume of civil aviation.The improved general multivariate linear regression model can weaken the influence of multicollinearity regression model and can got more reasonable results for economic structural analysis.
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Abstract:
Entrepreneurship and job creation development has become a great concern to mathematics educators in view of the unprecedented increase in unemployment in Nigeria. The basic problem in mathematics education is how to make students apply mathematical knowledge and skills in future outside the classroom context. Mathematics education provides a solid foundation for everyday life in individual by developing the ability of precision, logical, abstract thinking and ability to be accurate in solving real life problems. Entrepreneurship and job creation encourages self employment or self-reliance which depends highly on the proper acquisition of knowledge and skills in mathematics education. Entrepreneurs have the passion among other traits that enhance their business because the business creates jobs for them and they believe that their business success is their personal success. The paper discusses on the meaning of entrepreneurship, entrepreneurship development in Nigeria, mathematics education and entrepreneurship development, and factors that enhance entrepreneurship and job creation in Nigeria. If the individual has mathematics skills and knowledge, he can take decision on his own, consultant and could be able to solve problems hence he can stay on his own as an entrepreneur. He can be an employee of mathematics educators.
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Abstract:
This paper investigates the effect of activity-based method on SSII students’ academic achievement in computer science in secondary schools in Enugu urban of Enugu state. Activity-based method is a teaching/learning method in which both teachers and students are engaged in the learning processes. Activity based method provides students with a wide range of opportunities to gain not only subject knowledge effectively but also general, technical and academic skills by interacting with different learning activities and technologies.
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Abstract:
Let G be a graph with vertex set V (G) and edge set E (G). The Harmonic polynomial is defined as H(G,x) = 2 𝑥 𝑑 𝑢 + 𝑑 𝑣 −1 𝑢 𝑣 ∈𝐸 ( 𝐺 ) , where d(v) is the degree of vertex v in G. In this paper degree, inverse degree and Revan vertex degree based Harmonic polynomials for 2, 2, 3-trimethyl pentane, carbon nanocone C5[2] and carbon nanotube TUAC6 are investigated.
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Abstract:
Mobile applications serve in many different areas such as communication, education, entertainment, etc. The purpose of this study is to examine the effects of utilitarian and hedonic motives on the use of mobile applications by graduates and students in the preference of mobile application, the perceived usefulness and perceived ease of use for mobile applications. In this study, firstly the studies researching the effects of hedonic and utilitarian motives on the product / service preference were examined and then the effects of these motives on the application preferences of users within the scope of mobile application marketing were investigated. It is evaluated that this study will be a reference work that can benefit system development decisions with detailed information about consumers' mobile application preferences with a distinction between students and graduates.
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Abstract:
In this paper, Ig-normal spaces, Ig*- normal spaces, Ig-regular spaces and mildly Ig-normal spaces are introduced. Characterizations and properties of such new notions are studied. Some preservation theorems for these normal spaces are obtained.
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Abstract:
Biological observations revealed that administration of carbontetrachloride to hyperthyroidic rats helped the rats in acquiring weight. Whereas, carbontetrachloride administration to hypothyroidic rats resulted into a non significant increase in body weight. Liver-body weight relationship also changed in hyper and hypothyroidic rats. It decreased in hyperthyroidic and carbontetrachloride treated rats but increased in hypothyroidic and carbontetrachloride treated rats.
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Abstract:
Water is an crucial part of our lives. It's preposterous for anybody to get by for a really long time length without water. Water cleanliness is moreover essential as spoiled water can climb to various difficulties among living animals. Consequently, various techniques are used to oversee water. In some cases, the sensible little standard substance headway is used to channel the water. This progress ought to be environment particularly coordinated. This technique has been used to empower the water considered various streams besides.
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