iosr-JMCE   Volume-18 ~ Issue-1 ~ Jan. – Feb. 2021

Abstract: The depletion of the world's fossil oil reserves and the increasing energy demand, demand to look for other energy sources. Generating electrical energy using renewable energy such as energy: water, wind, solar, and battery charging systems. It can also convert mechanical energy to electrical energy, known as synchronous generators. The purpose of this study was to determine the effect of the variable rotor-stator motor distance, and the angle between the rotor magnets on rotation and power. A set of permanent magnet generator modules for measuring the speed and torque generated by the permanent magnet generator. The rotor-stator is made of magnets that are placed on the resin. The rotor-stator magnet motor gab is set.....

Key words: Gab, attack angle, Rotor-stator, generator magnet permanent.

[1]. M. Grover, B. Lohith Kumar, and I. Ramalla, "The Free Energy Generator," Int. J. Sci. Res. Publ., vol. 4, no. 1, pp. 2250–3153, 2014.
[2]. S. H. Susilo, Z. Jannah, L. D. Mustofa, and Y. Effendhi, "Design of permanent magnet motor," IOP Conf. Ser. Mater. Sci. Eng., vol. 732, no. 1, 2020, doi: 10.1088/1757-899X/732/1/012090.
[3]. S. H. Susilo and Z. Jannah, "Effect of Electrodes, Electric Currents, And Nacho3 Concentration Against Hho Pressure Generator," vol. 10, no. 4, pp. 1–3, 2020.
[4]. W.-Z. Fei, "Permanent magnet synchronous machines with fractional slot and concentrated winding configurations," no. January 2011.
[5]. N. T. Yi, "Investigation on the Free Energy Magnet Motors," Thesis, no. May 2011.

Abstract: Steel structures are considered the most common structures in the world. In these structures, joints play an essential role in evaluating performance and seismic behavior. Therefore, achieving optimal design criteria that have the ability to use the maximum capacity of connections, has always been considered. In this research, numerical studies have been performed to evaluate the seismic performance of bolted beam-to-column joints with endplates and also the effect of stiffeners on the seismic performance of connections. In this regard, by considering 3 main parameters (column stiffener, endplate stiffener, and bolt diameter), 8 models of beam-to-column bolted connections have been....

Keywords: Joints, Stiffness, Endplate, Bolts, Stiffeners, Seismic performance, Beam-to-column connection

[1]. G.W. Owens, B. Cheal, Structural Steelwork Connections, Butterworth-Heinemann, 1989.
[2]. N.S. Trahair, M. Bradford, D. Nethercot, L. Gardner, The Behaviour and Design of Steel Structures to EC3, CRC Press, 2007.
[3]. X.C. Liu, F.Y. Cui, Z.Q. Jiang, et al., Tension-bend-shear capacity of bolted-flange connection for square steel tube column, Eng. Struct. 201 (2019) 439–460.
[4]. X.C. Liu, X.J. Zhou, A.L. Zhang, et al., Design and compilation of specifications for a modular-prefabricated high-rise steel frame structure with diagonal braces. Part I: Integral structural design, Struct. Des. Tall Spec. 27 (2) (2018) 1–20e1415.
[5]. X.C. Liu, X.N. He, A.L. Zhang, et al., Design and specification compilation of a modular-prefabricated high-rise steel frame structure with diagonal braces part II: Elastic-plastic time-history analysis and joint design, Struct. Des. Tall Spec. 27 (2) (2018) 1–18e1414.

Abstract: Safety climate has been described as a surface manifestation of safety culture. However, past studies on safety culture and safety climate have not conducted an in-depth exploration of the link between safety climate and safety culture. Hence, this study explored the relationships between safety climate and safety culture on construction sites. A questionnaire survey of professionals employed by construction contractors in the south-western states of Nigeria was conducted. The data analysis was conducted using mean score, t-test and Pearson correlation test.The study found that safety culture is highly and positively correlated with safety climate; and that poor safety culture will contribute to unhealthy safety climate on the construction sites. The study concluded that as the safety culture practices increase, the overall safety climate on the construction site is enhanced.

KEYWORDS: safety climate, safety culture, construction sites, construction safety

[1]. Advisory Committee on the Safety of Nuclear Installation (ACSNI) (1993). Organizing for Safety. Third report of the Human Factors study group of the Advisory Committee on Safety in the Nuclear Industry. Health and Safety Commission. HMSO. London.
[2]. Andi (2008). Construction Worker Perception towards Safety Culture. Civil Engineering Dimension, 19(1) March, 1-6.
[3]. Ayangade, J. A. (2001). An Evaluation of Safety Practices in Selected Construction Sites in Nigeria. Unpublished M.Sc. Thesis, Department of Building, Obafemi Awolowo University, Ile Ife, Nigeria.
[4]. Biggs, S. E., Banks, T. D., Darvey J. D. and Freeman, J. E. (2013). Safety Leader's Perception of Safety Culture in a Large Australasian Construction Organization. Journal of Safety Science, 52, 3-12.
[5]. Brown, R. L. and Holmes, H. (1986). The Use of a Factor-Analytic Procedure for Assessing the Validity of an Employee Safety Climate Model. Accident Analysis and Prevention, 18(6), 455-470.

Abstract: Cracks occur as an unavoidable consequence of unequal concrete tensile electricity, the tensile strength of the metal in the concrete construction elements, and the concrete channels used for irrigation purposes. But, for those reasons, it is very rare to use it to explain a cracking incident on a concrete floor, so we had to evaluate the optimal cracks and the degree of reception. The advent of cracks in concrete and reinforced concrete structures is a sign of defects, but certain types of cracks do not have a bad impact on the ability of the paintings from the perspective of fair requirements. There are various and varied causes of........

Keywords: Irrigation purposes , Concrete ,Defects, Cracks

[1]. Rabczuk, T., Zi, G., Bordas, S., & Nguyen-Xuan, H. (2008). A geometrically non-linear three-dimensional cohesive crack method for reinforced concrete structures. Engineering Fracture Mechanics, 75(16), 4740-4758.
[2]. Dai, J. G., Akira, Y., Wittmann, F. H., Yokota, H., & Zhang, P. (2010). Water repellent surface impregnation for extension of the service life of reinforced concrete structures in marine environments: the role of cracks. Cement and Concrete Composites, 32(2), 101-109.
[3]. Rabczuk, T., & Belytschko, T. (2006). Application of particle methods to static fracture of reinforced concrete structures. International Journal of Fracture, 137(1-4), 19-49.
[4]. Mackechnie, J. R., & Alexander, M. G. (2001). Repair principles for corrosion-damaged reinforced concrete structures. Research monograph, 5.
[5]. Bažant, Z. P., & Gambarova, P. (1980). Rough cracks in reinforced concrete. Journal of the Structural Division, 106(4), 819-842..

Abstract: Nowadays most of the concrete applications utilize 15 to 20% of copper slag generated and remaining material is dumped as a waste. To reduce the accumulation of copper slag and to provide an alternative material for sand and cement approach has been done to investigate the use of copper slag in concrete for the partial replacement of sand and cement. In this paper M30 grade concrete is used to determine various mechanical properties of concrete. The focus is on consists of substituting cement partially by lime stone powder and sand partially by copper slag in concrete. For cement replacement, four test groups including control mixture were constituted with replacement of 0% (control specimen), 10%, 15% lime stone powder with cement in each series sand replacement, and six test groups (including control mixture) were constituted with replacement of 0% (control specimen), 20%, 40%, 60%, 80% and 100% copper slag with sand in each series.........

Keywords: Copper Slag, Compressive Strength, Split Tensile Strength, Flexural Strength.

[1]. C.Dhanalaxmi , Dr.K.Nirmalkumar studied on, Study on the Properties of Concrete Incorporated With Various Mineral Admixtures – Limestone Powder and Marble Powder (Review Paper), International Journal of Innovative Research in Science, Engineering and Technology (An ISO 3297: 2007 Certified Organization) Vol. 4, Issue 1, January 2015.
[2]. A.Jayaraman, V.Senthil kumar , Dr.G.Anusha , M.Saravanan ,studied on Optimization of Partially Replacement of Natural Sand & Ordinary Portland cement By M-Sand and Lime stone powder ,International general of engineering science & technology , ISSN: 2277-9655, March, 2014.
[3]. Tanveer Asif Zerdi ,investigated on,Performance of Limestone Powder on Strength Properties as Partial Replacement of Fine Aggregate in Concrete Mix,INDIAN JOURNAL OF APPLIED RESEARCH, Volume : 6 | Issue : 5 | May 2016 | ISSN - 2249-555X | IF : 3.919 | IC Value : 74.50.
[4]. Olesia Mikhailova, Grigory Yakovlev , Irina Maeva , Sergey Senkov, studied on ,Effect of Dolomite Limestone Powder on The Compressive Strength of Concrete ,Procedia Engineering 57 ( 2013 ) 775 – 780 ,11th International Conference on Modern Building Materials, Structures and Techniques, MBMST 2013.
[5]. CHEN Lun-jian, HE Jun, CHAO Jun-qi, QIN Ben-dong, studied on, Swelling and breaking characteristics of limestone under high temperature, Mining Science and Technology, 19 (2009) 0503–0507.