http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/767 Volume 11, Number 2, December 2023 Wed, 22 Apr 2026 09:37:30 GMT 2026-04-22T09:37:30Z http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/891 Antibacterial/Antiviral Face Masks: Processing,Characteristics, Challenges, and Sustainability Hoque, Md Enamul; Sarker, Mirajul Alam; Arif, Kiswa; Ali, M. Azam; El-Bialy, Tarek The facemask has become a part of our daily life after the emergence of SAR-CoV-2, commonly known as the novel coronavirus 2019 or, COVID-19 all over the world. On a day-to-day basis, previously the face mask has been used to filter airborne particles entering the body and affecting the respiratory system, especially by individuals in pollution-prone areas. But as the pathogens having severe acute respiratory disease-causing abilities emerge with the potential to create a pandemic, the necessity of virus/bacteria killing ability along with the filtration efficiency of the face mask has come into account. Existing ordinary face masks have filtration capacity only. Sometimesit cannot restrict particles and pathogens of nano or even micro-scale. Moreover, when it is disposed ofafter use, it can be a potential source of pathogen transmission. Therefore, the developmentof antiviral/antibacterial face masks is the need of the hour. This article focuses on the advancement of face mask processing methods, existing and promising antibacterial/antiviral agents, socio-economic sustainability, and challenges in achieving the goal of a green environment. Besides, various characteristics of the face mask like swelling and degradation properties, morphologies (SEM, FESEM), mechanical strength, antioxidant property, and antimicrobial activityare also revealed. Lastly, some future perspectives and directives are accordingly discussed with the hope that the grim of any future pandemic should not shroud us and make the world stalled again. Fri, 01 Dec 2023 00:00:00 GMT http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/891 2023-12-01T00:00:00Z http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/890 Terracotta in Architecture: Overview on Historical and Contemporary Practice in Bangladesh Abu Salaque, Syed Although Terracotta is one of the oldest in almost all sub-continents and was spread out across the whole world now-a-days it has been a common, traditional, and indigenous object in Bangladesh for everyday life. Inspired by the religion or rituals, terracotta art has evolved in many ways in Bengal over time. From Babylon walls to high-performancerain screens, terracotta claddings have proven repeatedlyto be technologically superior and aesthetically rich. Realizing the evolution of terracotta prepares architects to add new, creative chapters to a superior history. Through an extensive inventory of recent examples, project case studies and architectural details, this study provides a foundation for understanding the nature of the material and the opportunities it offers in the urban life. The objective of the paper is to know the evolution of terracotta as a historic, artistic and cultural materials and shapes of objects with aesthetical andtechnical aspects that plays an important role for place making in both exteriorandinterior of architectural design and building practice. The paper explores the evolution of terracotta in Bangladeshand prepares architects and builders to make new, creative uses of the timeless material. Validating the examples of expressive possibilities, this preciousstudy can be aninspiration for students and professionals alike who are interested increating sustainable spaces by using visual and cultural components. Fri, 01 Dec 2023 00:00:00 GMT http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/890 2023-12-01T00:00:00Z http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/889 Development of Space-Borne Antenna Reflector via 3D Printing Kori, Jaya; Patnaik, Sampurna; Chattopadhyaya, Somnath; Chatternjee, Sayan The growing necessity of large aperture-based structures for many aerospace applications emphasizes the need to deploy large antenna structures in space. The space antennas should be light in weight and have low stowage volume, with efficient membrane packaging. The concept of additive manufacturing has been introduced to reduce weight as well as cost. In this paper, a comparative study has been done to analyze the advancement made in reducingweight with adequate strength. Based on the study, the main objectives are to develop a 3D-printed spherical reflector model with high specific strength and to assess the consistency of the model's shape. For determining the specific strength, tensile testing is performed on four different infill densities (20%, 40%, 60%, and 80%) with a grid infill pattern. It was observed that the specimen with 80% infill density has the highest tensile strength, 36.56 MPa, which is 23.51% more than 20% infill. However,the specimen with 20% infill density has the highest specific strength of 19.323 GPa/kg among the four specimens, which is approximately 64.64% higher than the 100% infill density. As a result of the testing, the spherical reflector model is 3D printed with 20% infill density, and it was found that the model achieves its shape stability and shape consistency with adequate specific strength. Fri, 01 Dec 2023 00:00:00 GMT http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/889 2023-12-01T00:00:00Z http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/888 Physical, Mechanical, and Durability Properties of Concrete with Class F Fly Ash Islam, Md Jahidul; Ahmed, Tasnia; Salehin, Md Riadus; Sadman Sakib, Mohammad; Shariar, Md Shakil; Hossain, Monowar Concrete is one of the most used manufactured materialsin the world. Fly ash (FA) is a byproduct produced from pulverized coal combustion in power generation. A total of 0.08 million tons of class F fly ash is produced from a coal-based power plant yearly in Barapukuria, Bangladesh, whose disposal is of a great issue. Therefore, this study aimsto explore the possibility of using class F FA in concrete construction as a supplementary cementitious material. In this study, two different water-to-cement ratios (0.4 and 0.5), each with five cement replacement levels numerically, 0%, 10%, 20%, 30%, and 40% with FAare used. Various tests are performed on cylinder and beam specimens to assess physical, mechanical, and durability properties, such as workability, density, compressive strength (CS), splitting tensile strength (STS), flexural strength (FS), chloride ion penetrability (CIP), and shrinkage. Analyzing the results, it is reported that workability increases and density decreases with the increasingFA replacement. Mechanical properties mostly decrease with increasing FA content. However, the strength gained with age is higher for concrete with FA compared to the control concrete. The CIP reduces with FA replacement, especially at 56 days of age. Shrinkage value reduces 82% at 40% replacement FA replacement and w/c ratio 0.4. However, at 10% FA replacement and concrete age of 56 days, mechanical strength loss is infinitesimal or even better compared to the control concrete. Thus, a low replacement percentage of FA with a high curing period is a suitable concrete cement alternative. Fri, 01 Dec 2023 00:00:00 GMT http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/888 2023-12-01T00:00:00Z