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

Abstract: Under the carbon peaking and carbon neutrality goal, the development of intelligent buildings will become a new solution for building energy conservation in the new era. The development of intelligent buildings will inevitably put forward new challenges to the training of building environment and energy engineering (BEEE) specialty. At present, many schools adopt the mode of large-category enrollment and professional diversion. In order to better adapt to the cultivation of innovative talents under the situation of large-category enrollment, attract excellent students to choose our specialty, and solve the contradiction between the traditional experimental teaching and talent training mode of BEEE specialty and the demand for new compound talents in the intelligent construction industry, this study proposes the conception of the experimental teaching system with the combination......

Keywords: Experimental teaching system; Combination of virtuality and reality; Building environment and energy engineering specialty; Large-category enrollment

[1]. Ministry of Education of the People's Republic of China(2012), Retrieved March 1, 2023, from http://www.moe.gov.cn/srcsite/A16/s3342/201203/t20120313_133322.html
[2]. Ministry of Education of the People's Republic of China(2018), Retrieved March 1, 2023, from http://www.moe.gov.cn/srcsite/A08/s7945/s7946/201806/t20180607_338713.html
[3]. Z.G. Zhang, Y.L. Chen, P.P. Rao, N. Li, J. Ni, Lab. Res. Explor., 38, 156-160(2019)[In Chinese]
[4]. Ministry of Education of the People's Republic of China(2021), Retrieved March 1, 2023, from http://www.moe.gov.cn/jyb_xwfb/s5147/202106/t20210607_536139.html
[5]. P. Dong, Z.Y. Guo, J. National Academy of Education Administration, 2, 61-67(2021) [In Chinese].

Abstract: Growing case of hearing loss has been reported due to global population ageing and over-uasge of hearing technology. However, only 14% of American adults with hearing loss use hearing aids. The high out-of-pocket costs for hearing aids constitute a major barrier to the wide spread usage of hearing aids. In this research, a macro-metamaterial-based hearing aid has been developed. Ring shaped meta-material-based sound amplifier has found to amplify input sound wave by 41.86 folds at 600 Hz. The current design can be easily translated to manufacture cost effective, 3D printable and battery-less hearing aids which would increase the prevalence of hearing aids among impoverished population with hearing loss.

Keywords: Intrathecal; Sound Amplification; Metamaterials; Engineering; Acoustic

[1]. WHO, Word Report on Hearing (2021).
[2]. Frank R Lin , E Jeffrey Metter, Richard J O'Brien, Susan M Resnick, Alan B Zonderman, Luigi Ferrucci(2021), Hearing loss and incident dementia,
[3]. Gurwinder, S., Raj, N., Anupma, M. (2015). A Review of Metamaterials and its Applications. IJETT, Volume 19, Number 6 Jan 2015.
[4]. Timothy, W. (2018). Design of Acoustic Metamaterials and Metasurfaces for Shock and Vibration Control. (SAND2018-4947PE). https://www.osti.gov/servlets/purl/1582187
[5]. Tianxi, J., Chong, L., Qingbo, H., Zhi-ke, P. (2021) Analysis of Stress and Strain in the Tetrachiral Metamaterial with Different Kinds of Unit Cell Connections. Procedia Structural Integrity, Volume 35, 2022, Pages 247-253

Abstract: Gas Turbine Compressor Package (GTCP) adalah turbin gas berfungsi sebagai penggerak kompresor sebagai beban dimana kompresor ini berfungsi untuk menaikkan tekanan gas sehingga gas tersebut mampu dialirkan menuju unit-unit penerimaan gas. Untuk mendapatkan hasil optimal dalam pengoperasian GTCP diperlukan analisis terhadap parameter-parameter yang berpengaruh didalam sistem GTCP, dimana dalam hal ini parameter yang berpengaruh tersebut adalah rasio kompresi pada kompresor. Pada penelitian ini digunakan analisis exergy untuk......

Keywords: GTCP; Exergy; Rasio Kompresi; Exergetic Sustainability Index; ESI; Environmental Effect Factor.

[1] X. Guo, B. Xu, Z. Ma, Y. Li, and D. Li, "Performance Analysis Based on Sustainability Exergy Indicators of High-Temperature Proton Exchange Membrane Fuel Cell," Int. J. Mol. Sci., vol. 23, no. 17, 2022.
[2] M. Zˇivić, A. Galović, and Z. Virag, "Detailed analysis of the effect of the turbine and compressor isentropic efficiency on the thermal and exergy efficiency of a Brayton cycle," Therm. Sci., vol. 18, no. 3, pp. 843–852, 2014.
[3] K. Seshadri, "Thermal design and optimization," Energy, vol. 21, no. 5, pp. 433–434, 1996.
[4] T. . Kotas, "kotas-the-exergy-method-of-thermal-plant-analysis_2.pdf." 1985.
[5] P. K. Nag, "Power plant engineering," Power plant Eng., 2005..

Abstract: The demand for electricity in developing countries such as India is constantly growing, driven by the needs of the industrial sector. Steam power plants play a critical role in meeting this demand, but their efficiency can be improved through the use of cogeneration. Cogeneration, also known as combined heat and power (CHP), involves the simultaneous production of electricity and useful heat, which can be used for various purposes such as heating and cooling. This study focused on a sugar mill with a 16 MW cogeneration unit to investigate the performance of the steam turbine through steam turbine extraction cogeneration method. The researchers conducted experiments at different stages of the process, taking into account various parameters such as steam flow, pressure, temperature, and flow rate......

Keywords: Cogeneration; CHP; mass flowrate; Specific enthalpy; Heat to Power ratio.

[1] M. J. B. Kabeyi and O. A. Olanrewaju, "Cogeneration potential of an operating diesel engine power plant," Energy Rep., vol. 8, pp. 744–754, Dec. 2022, doi: 10.1016/j.egyr.2022.10.447.
[2] S. C. Kamate and P. B. Gangavati, "Exergy analysis of cogeneration power plants in sugar industries," Appl. Therm. Eng., vol. 29, no. 5, pp. 1187–1194, Apr. 2009, doi: 10.1016/j.applthermaleng.2008.06.016.
[3] A. Ensinas, S. A. Nebra, M. Lozano, and L. Serra, "Analysis of cogeneration systems in sugar cane factories – Alternatives of steam and combined cycle power plants," Jul. 2006.
[4] G. V. Pradeep Varma and T. Srinivas, "Design and analysis of a cogeneration plant using heat recovery of a cement factory," Case Stud. Therm. Eng., vol. 5, pp. 24–31, Mar. 2015, doi: 10.1016/j.csite.2014.12.002.
[5] A. S. Karakurt, "Performance Analysis of a Steam Turbine Power Plant at Part Load Conditions," J. Therm. Eng., vol. 3, no. 2, pp. 1121–1121, Apr. 2017, doi: 10.18186/thermal.298611.

Abstract: Polymethyl methacrylate(PMMA) is a polymer which is widely used in dental and biomedical applications owing to its biocompatibility and ease of manipulation. The fabrication requirements for biomedical applications make the processing difficult by conventional machining. Laser micro drilling is a thermal-based non-traditional machining process which removes material by ablation and finds its usage mainly in the aerospace, automobile, biomedical applications etc. In this work, Laser micro drilling on PMMA is performed using spot diameter, feed rate and sheet thickness as the process parameters. The hole characteristics, Heat Affected Zone (HAZ) and.....

Keywords: PMMA, Laser micro-drilling, Circularity, Heat Affected Zone(HAZ), Regression Analysis, Teaching Learning Based Optimization( TLBO)

[1]. A. Ralls, P. Kumar, M. Misra, and P. L. Menezes, "Material Design and Surface Engineering for Bio-implants," JOM, vol. 72, no. 2, pp. 684–696, Feb. 2020, doi: 10.1007/s11837-019-03687-2.
[2]. O. S. Manoukian et al., "Biomaterials for Tissue Engineering and Regenerative Medicine," in Encyclopedia of Biomedical Engineering, R. Narayan, Ed. Oxford: Elsevier, 2019, pp. 462–482. doi: 10.1016/B978-0-12-801238-3.64098-9.
[3]. M. S. Zafar, "Prosthodontic Applications of Polymethyl Methacrylate (PMMA): An Update," Polymers, vol. 12, no. 10, p. 2299, Oct. 2020, doi: 10.3390/polym12102299.
[4]. R. Q. Frazer, R. T. Byron, P. B. Osborne, and K. P. West, "PMMA: an essential material in medicine and dentistry," J. Long. Term Eff. Med. Implants, vol. 15, no. 6, pp. 629–639, 2005, doi: 10.1615/jlongtermeffmedimplants.v15.i6.60.
[5]. D. Axinte, Y. Guo, Z. Liao, A. J. Shih, R. M'Saoubi, and N. Sugita, "Machining of biocompatible materials — Recent advances," CIRP Ann., vol. 68, no. 2, pp. 629–652, 2019, doi: 10.1016/j.cirp.2019.05.003.

Abstract: Among industrial wastes, tyre rubber waste is one of the hazardous wastes which are being generated and accumulated on a very large scale worldwide every year. In this research, an experimental investigation was carried out to study the effect of using waste tyre rubber as fine aggregate on concrete which was evaluated through mechanical properties. A total of 12 different concrete castings were conducted in this study by replacing fine aggregate of sand particles with fine rubbers with different ratios of 0%, 10%, 20%, 30%,40%, and 50%. Dolomite was used as coarse aggregate and silica fume with a constant content equal to (12.5%) of the weight of cement.....

Keywords: Aggregate Replacement; Compressive Strength; Flexural Strength; Rubberized Concrete; Splitting Tensile; Tyres.

[1]. Elshazly, F. A. (2020). Rubberized concrete properties and its structural engineering applications--an overview. The Egyptian International Journal of Engineering Sciences and Technology, 30, 1--11.
[2]. Pham, T. M.-L. (2022). Effect of rubber aggregate size on static and dynamic compressive properties of rubberized concrete. Structural Concrete, 23, 2510--2522.
[3]. Geso, M. a. (2007). Strength development and chloride penetration in rubberized concretes with and without silica fume. Materials and Structures, 40, 953--964.
[4]. Siddika, A. a. (2019). Properties and utilizations of waste tire rubber in concrete: A review. Construction and Building Materials, 224, 711--731.
[5]. Wang, J. (2020). Experimental and Numerical Investigation of Fiber-Reinforced Rubberized Concrete and Rubberized Self-Consolidating Concrete. Michigan Technological University.

Abstract: Assemblies of various elements that are often arranged in repeating patterns are used to create metamaterials. Their distinctive characteristics result from their substantial geometry and organization. Rather than the chemistry of the material, the geometry of the microstructure creates the novel properties of metamaterials. Metamaterials can be used in elastic wave filtering and vibration protection. Metamaterials have a wide range of uses since elastic waves are frequently encountered in a multitude of fields, including surface acoustic wave devices, seismology, and civil engineering. As a result, seismic metamaterials have become more prevalent over the past ten years. Typically, the frequency.....

Keywords: Frequency band gap, seismic metamaterials, vibration, waves.

[1]. M. G. el Sherbiny and L. Placidi, "Discrete and continuous aspects of some metamaterial elastic structures with band gaps," Archive of Applied Mechanics, vol. 88, no. 10, pp. 1725–1742, Oct. 2018, doi: 10.1007/s00419-018-1399-1.
[2]. L. Placidi, M. G. el Sherbiny, and P. Baragatti, "EXPERIMENTAL INVESTIGATION FOR THE EXISTENCE OF FREQUENCY BAND GAP IN A MICROSTRUCTURE MODEL," Mathematics and Mechanics of Complex Systems, vol. 9, no. 4, pp. 413–421, 2021, doi: 10.2140/memocs.2021.9.413.
[3]. A. Colombi, D. Colquitt, P. Roux, S. Guenneau, and R. v. Craster, "A seismic metamaterial: The resonant metawedge," Sci Rep, vol. 6, Jun. 2016, doi: 10.1038/srep27717.
[4]. X. Pu, A. Palermo, Z. Cheng, Z. Shi, and A. Marzani, "Seismic metasurfaces on porous layered media: Surface resonators and fluid-solid interaction effects on the propagation of Rayleigh waves," Int J Eng Sci, vol. 154, Sep. 2020, doi: 10.1016/j.ijengsci.2020.103347.
[5]. W. Liu, G. H. Yoon, B. Yi, Y. Yang, and Y. Chen, "Ultra-wide band gap metasurfaces for controlling seismic surface waves," Extreme.

Abstract: Strain-Hardening Cementitious Composites (SHCC) are distinct from normal mortar (NM) in that it has the ability to control crack width and exhibits ductile tensile strain-hardening behavior. The effectiveness of NM and SHCC as a strengthening jacket for concrete beams with shear deficiencies was assessed in the current study. Nine simply supported concrete beams are prepared; three of them were control specimens without web reinforcement in the studied region, whereas the others were either SHCC jackets or NM jackets. The key parameters comprised of the shear span-to-depth ratios (a/d = 1.50, 2.25, and 3.00), as well as SHCC or NM as the matrix of the strengthening....

Keywords: Shear-deficient beams; Strengthening; Strain-hardening cementitious composites (SHCC); Normal mortar (NM); Jacketing; Cracking behaviour, Energy absorption.

[1]. Triantafillou TC. Shear strengthening of reinforced concrete beams using epoxy-bonded FRP composites. ACI structural journal. 1998 Mar 1;95:107-15.
[2]. Khalifa A, Gold WJ, Nanni A, MI AA. Contribution of externally bonded FRP to shear capacity of RC flexural members. Journal of composites for construction. 1998 Nov;2(4):195-202.
[3]. Bousselham A, Chaallal O. Behavior of reinforced concrete T-beams strengthened in shear with carbon fiber-reinforced polymer-an experimental study. ACI structural Journal. 2006 May 1;103(3):339.
[4]. Chen JF, Teng JG. Shear capacity of fiber-reinforced polymer-strengthened reinforced concrete beams: Fiber reinforced polymer rupture. Journal of Structural Engineering. 2003 May;129(5):615-25.
[5]. Chen JF, Teng JG. Shear capacity of FRP-strengthened RC beams: FRP debonding. Construction and Building Materials. 2003 Feb 1;17(1):27-41.