iosr-JMCE   Volume-20 ~ Issue-2 ~ Mar. – Apr. 2023

Abstract: Background: The construction industry in recent times has been characterised by time overrun which are mostly caused as a result of payment delay. The research work assessed the effect of payment delay on time performance in the construction industry with focus on the relationship between payment delay and time overrun. Materials and Methods: Data were source using case study data from 20 selected projects in Edo state with interview with key professionals on those projects. A total of 12 professionals were interviewed to identify the major causes of payment delay on the projects. Data were analysed using percentile and linear regression was used to show the relationship......

Keywords: Construction Projects; Payment Delay; performance; Time overrun and Time Performance

[1]. Aibinu, A.A and Odeyinka, H. A. (2006), Construction Delays and their Causative Factors in Nigeria, Journal of Construction Engineering and Management.1 (2).
[2]. Alaghbari, W. E., Kadir, M. R. A., Salim, A., & Ernawati, K. (2007). The significant factors causing delay of building construction projects in Malaysia. Engineering, Construction and Architectural Management, 14(2), 192-206.
[3]. Ansah, S.K. (2011). Causes and Effects of Delayed Payments by Clients on Construction Projects in Ghana. Journal of Construction Project Management and Innovation. 1(1): 27 - 45, ISSN 2223-7852.
[4]. Ayodele, E.O and Alabi O.M (2011). Abandonment of Construction Projects in Nigeria: Causes and Effects. Journal of Emerging Trends in Economics and Management Sciences (JETEMS) 2 (2): 142-145. (ISSN: 2141-7024)
[5]. Djokoto, V.K.T (2017). Factors that Influence Late Payments in Government New Build Infrastructure Projects in Gauteng Province, South Africa. An Unpublished Masters Research Thesis Submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg.

Abstract: A simplified framework is adopted to model damagedconfirmed composite structures during drilling, focusing on cutting. This study is divided into two parts. The first part consists of the experimental analysis of drilling applied to unidirectional laminates in carbon/epoxy, examining various angles between the direction of fibers and the tool cutting direction (cutting speed). The second part involves numerical modelling of orthogonal cutting in statics for fibers oriented at 30°,45°& 60°with respect to the tool's cutting direction. The experimental analysis shows that the angle between fiber orientation, cutting speed, and feed greatly influences chip formation and rupture modes. The numerical computation focuses on the fracture process, specifically the energy release rate, computed using.........

Key Word: Delamination, feed rate, drilling, critical thrust force, torque.

[1]. D.H. Wang et al.Orthogonal cutting mechanisms of Graphite/Epoxy, composite part II: multi directional laminateInt J Mach Tool Manufacturing. (1995)
[2]. W. König et al.Quality definition and assessment in drilling of fibre reinforced thermosetsAnnal CIRP(1989)
[3]. J.P. DavimStudy of drilling metal–matrix composites based on the taguchi techniquesJ Mater Process Technol(2003)
[4]. J.P. Davim et al.Drilling carbon fibre reinforced plastics manufactured by autoclave experimental and statistical studyMater Des(2003)
[5]. J.P. Davim et al.Study of delamination in drilling carbon fibre reinforced plastics (CFRP) using design experimentsCompos Struct(2003).

Abstract: Background: A novel missile guidance law that works effectively for highly maneuverable targets is the major requirement of defense technique. To meet this requirement multi-controller architecture for guidance of missiles has been developed in this paper. A fussy logic-based system is designed to choose the proper control law for suitable range and closing velocity. The proportional navigational law, ON-OFF controller and fuzzy proportional navigational law are selected for the design of guidance scheme. Materials and Methods: If the line-of-sight.........

Key Word: Guidance; control; fuzzy logic; missile.

[1]. SiourisGM, Missile Guidance and Control Systems. Springer-Verlag, New York, 2004
[2]. YanushevskyR. Modern Missile Guidance, 2nd ed. Taylor & Francis Grou, 2019
[3]. ZaikangQ, DefuL. Design of Guidance and Control Systems for Tactical Missiles. CRC Press, 2020
[4]. BeheraL, KumarS, KumarP, RanjithP, NairR, DuttaS. Intelligent Control of Robotic Systems. CRC Press, 2020
[5]. HassanL, SadatiSH, KarimiJ. An Optimal Fuzzy Logic Guidance Law using Particle Swarm Optimization. Int. Journ. of Computer Appl. 2013; 69 (3)

Abstract: According to the development trend, many high-rise buildings will be built. Along with it is the need for an escape solution when there is a problem for people living and working in it. Therefore, the new rescue system is a combination of lifting baskets and ladders installed outside the building, helping to rescue adults, children and the elderly at the same time. The structure of the lifting basket is set out to ensure that when storing and transporting, the basket is removed and stowed. When installing for rescue use, the lift basket are assembled quickly.The basket structure ensures safety, the stress does not exceed the allowable value and can meet the requirements of the load and relevant standards. However, the method of calculating the basket for the rescue system has not been published many studies.Therefore, this paper will study the calculation method, applied to evaluate the basket of the rescue system that we have just proposed..

Key Word: basket and ladders, effective load, rescue system, strength assessment

[1]. Waymon,B. R, .(2001). Emergency rescue system. United States Patent US4,386,680A.
[2]. Franz, J.G,.(1984). Rescue system on high-rise buildings. United States Patent US4,433,752A.
[3]. Julien, T,.(2013). Tower rescue emergency module. United States Patent US20130206505A1.
[4]. Julian, E. R, Peter, T. M.N. Personal height rescue apparatus. United States Patent US9,427,607 B2.

Abstract: This paper seeks to determine a comparative study between Hydrofluoroolefin (HFO) and Hydro fluorocarbons (HFC) by considering three different refrigerants R1234yf/R134a in a mass proportion of 60/40%, R134a, R410a. The performance of the system is evaluated in a water chiller of 1TR capacity, to achieve a low GWP refrigerant as the HFC group refrigerants are possessing high GWP of R134a (1430), R410a (2088). The experimental set up was built up with suitable requirements considering the compressor compatibility and insulated with polymer foam inside the evaporator. The comparisions are made considering the R134a and R410a as a base, to find alternative....

Key Word: HFO, R1234yf, COP, VCRS, GWP, ODP, BLEND.

[1]. J.M. Belman-Flores, J.M. Barroso-Maldonado, A.P. Rodríguez-Muñoz, G. Camacho-Vázquez, Enhancements in domestic refrigeration, approaching a sustainable refrigerator – A review, Renewable and Sustainable Energy Reviews 51, pp: 955–968 , (2015).
[2]. Zhaohua Li, Kun Liang, Hanying Jiang, Experimental study of R1234yf as a drop-in replacement for R134a in an oilfree refrigeration system, Applied Thermal Engineering 153 646–654, (2019).
[3]. M.MadhuNayak, B.Hadya, Md.Azizuddin, A Comparative Study of Performance of HFC Group Refrigerants and HFO Refrigerants, Gradiva review journal, volume 8 issue 4 2022 , page no: 165 , Issn no : 0363-8057.
[4]. A. Saibhargav, K.Srinivasa Reddy, V.Mukesh Reddy, Performance Analysis of Vapour Compression Refrigeration System Using HC Refrigerant Mixtures for Water Chiller, International Journal of Innovative Technology and Exploring Engineering (IJITEE) ISSN: 2278-3075, Volume-8 Issue-9, July 2019.
[5]. Boda Hadya, A. M. K. Prasad, Suresh Akella. Performance Assessment of HFC Group Refrigerants in Window Air Conditioning System. International Journal of Mechanical Engineering and Applications. Vol. 3, No. 5, pp. 81-85, 2015.

Abstract: The Bayer Process for the production of alumina from Bauxite ore is characterized by low energy efficiency and it results in the production of significant amounts of dust-like, high alkalinity bauxite residues known as red mud. Currently red mud is produced almost at equal mass ratio to metallurgical alumina and is disposed into sealed or unsealed artificial impoundments (landfills), leading to important environmental issues. It comprises of oxides of iron, titanium, aluminium and silica along with some other minor constituents. Presence of Alumina and Iron oxide in red mud compensates the deficiency of the same components in limestone which is the primary.......

[1]. Balasubramaniam.S, Vasantha Kumar.R, 2008,"Waste Into Wealth" TMS (the minerals, metals and materials society).
[2]. Chuan-shengWu1, Dong-yan Liu, 2012,"Mineral Phase and Physical Properties of RedMud Calcined at Different Temperatures" Journal of Nanomaterials, Article ID 628592, pp 1-6
[3]. Daniel Véras Ribeiro, João António Labrincha, Marcio Raymundo Morelli, 2010 "Potential Use of Natural Red Mud as Pozzolan for Portland Cement
[4]. Daniel versa Ribeiro, Marcio Raymundo morelli,2011, "Cementitious Activity of Calcined Red Mud", International Journal of Pavement Engineering & Asphalt Technology, Vol. 12, pp 40-49.
[5]. Esin Günay, Ehat Giray Arslan, Yasemin Kılıç, Naci Yılmaz, Mustafa Kara, Müzeyyen Marsoğlu, 2002, "The Utilization of Waste Red Mud for Colouring of City Furnitures" pp.29-34

Abstract: By combining finite element modelling and artificial neural network, this paper proposes a novel approach using ANN for single stage prediction of severity and location of damage in structures. The study utilizes FEM for simulating crack type damage of varying severity at various critically stressed locations of the structure. Various modal response data such as vibration frequencies, mode-shapes and frequency response functions, corresponding to the considered damage scenarios are synthetically generated from the FE model and used for training the Artificial Neural Network model........

Key Word: Vibration-based damage detection; k-fold cross-validation; frequency response function; mode shape curvatures; artificial neural networks; machine learning.

[1]. Abdeljaber, O. Avci, O. Kiranyaz, S. Gabbouj, M. and Inman, D.J. Real-time vibration-based structural damage detection using one-dimensional convolutional neural networks, Journal of Sound and Vibration, 2017; 388: 154–170.
[2]. Almustafa, M.K. and Nehdi, M.L. Machine learning model for predicting structural response of RC slabs exposed to blast loading, Engineering Structures, 2020; 221:Article 111109
[3]. Cao, M. Radzieński, M. Xu, W. and Ostachowicz, W. Identification of multiple damage in beams based on robust curvature mode shapes, Mechanical Systems and Signal Processing, 2014;46(2): 468–80.
[4]. Farrar, C.R. Doebling, S.W. and Nix, D.A. Vibration–based structural damage identification, Philosophical Transactions of the Royal Society of London Series A: Mathematical, Physical and Engineering Sciences,2001; 359(1778): 131–49.
[5]. Huang, H. and Burton, H.V. Classification of in-plane failure modes for reinforced concrete frames with infills using machine learning, Journal of Building Engineering,2019; 25: Article100767.

Abstract: A comparative performance analysis is being carried out on a four cylinders, four stroke spark ignition engine having displacement volume 1086 cc. The CNG port injection (CNG-PI) system and CNG sequential injection (CNG-SI) were run on single engine. The engine was modified in such a way that engine run on both to run on both CNG-PI and CNG-SI system alternately with common CNG tank and other engine loading and measurement system. The engine was equipped with electrical dynamometer having rheostat type loading. The operating parameters can be obtained on computer screen by loading the computer with engine through switch box. The engine was run over the speed range of 900 rpm to 3000 rpm with incremental speed of 300 rpm.......

Keywords: Compressed Natural Gas (CNG), CNG-PI system, CNG-SI system

[1]. Semin, R. A. B. (2008). A technical review of compressed natural gas as an alternative fuel for internal combustion engines. Am. J. Eng. Appl. Sci, 1(4), 302-311. [2]. Kalam, M. A., Masjuki, H. H., Mahlia, T. M. I., Fuad, M. A., Halim, K., Ishak, A.. & Shahrir, A. (2009). Experimental test of a new compressed natural gas engine with direct injection. [3]. Patel, R., & Brahmbhatt, P. (2018). Performance characteristics comparison of CNG port and CNG direct injection in spark ignition engine. European Journal of Sustainable Development Research, 2(2), 26. [4]. Aziz, A. R. A., & Shahzad, R. (2010). Combustion analysis of a CNG direct injection spark ignition engine. International Journal of Automotive and Mechanical Engineering, 2, 157-170. [5]. Amiruddin, H., Mahmood, W. M. F. W., Abdullah, S., Mansor, M. R., & Abdollah, M. F. (2017). Experimental Investigation of Performance and Emissions of a Stratified Charge CNG Direct Injection Engine with Turbocharger. In MATEC Web of Conferences (Vol. 124, p. 07004). EDP Sciences.