Sustainable Engineering and Innovation (SEI - E-Journal)
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Effect of differently treated recycled concrete aggregates on Marshall properties and cost-benefit of asphalt mixtures
Full text linkMarshall properties are one of the major requirements for designing hot asphalt mixtures. These properties need to be evaluated to make sure that asphalt pavement performs well over its service life. The evaluation of the Marshall properties of asphalt mixtures containing coarse recycled concrete aggregates (RCA) was the study's main target. RCA properties differ from virgin aggregate in the presence of cement mortar. To improve RCA properties, two methods were adopted. The first, termed pre-soak treatment, consisted of soaking RCA in acetic acid for 24 hours at a concentration of 0.1 M. The second one, termed mechanical treatment, involved placing RCA inside the Los Angeles machine with balls and running it for 500 cycles. RCA was incorporated into asphalt mixtures at percentages 20, 40, 60, 80, and 100% of coarse virgin aggregate. The results of the study showed that replacing virgin aggregate with RCA led to economic feasibility. Despite the amount of asphalt binder increasing as coarse RCA content increased, the characteristics of HMA were not significantly altered except for Marshall stability. The maximum increase in Marshall stability happened in the mixture containing 60% untreated RCA; it was 14.78% greater than the control mixture
Preliminary reactor design for gold nanoparticle production by the Turkevich method on an industrial scale
Full text linkThis study aims to design and analyze the design of a batch-type reactor to optimize the production of gold nanoparticles on an industrial scale. The method used in the design of this reactor is the computational analysis of the reactor calculations, including stirring and mass balance as initial calculations using the Microsoft Excel application manually. The calculation results show that the designed reactor specifications have a reactor volume of 21.7335 ft3, cylinder height of 13.4612 in, a height of solution in the cylinder of 8.9046 in, vessel diameter of 73.2984 in, design pressure of 9.9978 psig, impeller length of 9.1840 in, shaft length of 10.5418 in, with stirring power 62.5228 Hp. Reactor design analysis is an important stage in the design of production processes on an industrial scale, where the specification results from the designed reactor can be used not only to adjust the reactor to the product but also to be used as a reference for production costs. The results of computational analysis and calculations performed on the reactor design in this study can be used as a reference and can be applied in the design of reactor performance analysis as a learning media, including operating mechanisms in the production process
A review of enhanced image techniques using chaos encryption
Full text linkSecured multimedia data has grown in importance over the last few decades to safeguard multimedia content from unwanted users. Generally speaking, a number of methods have been employed to hide important visual data from eavesdroppers, one of which is chaotic encryption. This review article will examine chaotic encryption methods currently in use, highlighting their benefits and drawbacks in terms of their applicability for picture security
Li-Fi technology-based long-range FSO data transmit system evaluation
Full text linkVisible light is used by a technology known as Light Fidelity to establish wireless internet connections very quickly. This article offers line-of-sight communication between the transmitter and receiver using LED technology. Li-Fi technology is a method that transmits data using LED light, which is faster and more efficient than Wi-Fi. Since it is practically ubiquitous, light can be used for communication as well. A cutting-edge technology called optical communication includes a subset called Li-Fi. By sending out visible light, the Li-Fi device enables wireless intranet communication. An in-depth study and analysis of Li-Fi, a novel technology that transmits data at high speeds over a wide spectrum by using light as a medium of transmission
Evaluation of the thermal performance of housing envelopes as passive cooling systems
Full text linkOver the years, climate change has generated an increase in the average temperature of the planet, which has led to greater consumption of electrical energy for the use of air conditioning systems. Insulating envelope materials are considered a viable passive solution as they offer internal air conditioning, cooling, and/or heating of buildings that lead to thermal comfort with reduced energy consumption. This article compares the application of different insulating materials in an existing single-family home located in a hot-dry climate. To this end, the procedural methodology has been applied by carrying out a bibliographic review of different involutes currently used in the construction of the buildings and 14 models are proposed that will be simulated under the same input variables of the base model and meteorological data of the city of Bucaramanga validated from a meteorological station located on site. The results of the simulations show that all 14 models show a decrease in temperature with reference to the "base model"; This difference can be explained by the presence of the selected materials that slightly change the thermal properties of the wall. Finally, this research allowed us to determine that the occupants of the simulated spaces in the base model are inside the thermal comfort range by 61.96%, which represents 5,438 hours of the modeled year, having 38.03% of hours of discomfort in the measured time. This study can be useful for the selection of envelopes and different buildings with passive cooling requirements
Enhancing BYOD mobile device security in a hybrid environment
Full text linkResearch on enhancing Bring Your Own Device (BYOD) security in hybrid environments is critically relevant and important to protect data and ensure customer and organizational trust through the development of strong security policies. The study aims to develop and implement effective strategies and interventions that will help ensure that corporate data and resources are protected when employees use personal mobile devices in an environment where both on-premises and cloud-based resources are present. The methods used include analytical, deduction, modeling, statistical, and synthesis methods. This research identified specific vulnerabilities of potential threats to BYOD mobile devices in a hybrid environment and developed security strategies that include recommendations for creating a security policy and using a mobile device management system. The research led to the development of specific technical solutions, such as recommendations for mobile device configuration. This included educating employees and managers about security rules and the importance of adhering to security policies, and updated lists of current BYOD security threats and challenges given the changing threat environment. The practical value of the work lies in providing practical relevance to organizations by providing robust protection of sensitive data and resources, increasing employee comfort and confidence in the security of personal devices, easing IT departments’ tasks of device management and threat detection, and increasing customer and partner confidence in a security-layer organization
A comprehensive review on IoT based smart cities
Full text linkA smart city uses information and communication technology to improve the utility, share knowledge with the public, and provide a strong sense of community support and local government assistance. Shrewd urban communities are those that make use of brilliant ideas and information as the required resources to address the maintainability issues that urban communities face. Many metropolitan areas are currently becoming more intelligent, utilizing information and innovation to advance transportation, energy consumption, wellness, and air quality, as well as to spur economic growth. A great city's main objective is to streamline municipal operations, promote economic development, and address resident happiness through clever developments and data analysis. We intended to spend a great amount of time reading up on several shrewd urban groups in this post. As a result, some of the key boundaries that can bebuilt include clever management, clever energy, clever building, clever flexibility, clever structure, clever invention, clever medical care, and clever residence. Urban areas collect and analyze information using IoT devices such as connected sensors, lighting, and meters. The foundation, public usage, and administrations, to name just a few, are all progressively developed in urban areas using this knowledge. Smart urban communities focus on improving the lives of their residents in such fundamental areas as strategy effectiveness, reducing waste and everyday problems, improving friendly and financial quality, and enhancing the social consideration of their residents
An inset-fed rectangular microstrip patch antenna with multiple slits for sub 6GHz – 5G applications
Full text linkThis paper presents an inset feed Rectangular Microstrip Patch Antenna with Multiple slits for sub 6 GHz - 5G Applications. This antenna is proposed with the development, design, running simulations and finally a conclusion of the analysis. The antenna in this paper is implemented using a technique called “inset-feed” and multiple slits. The dielectric used as a substrate is FR-4. The proposed antenna is useful for a sub 6 GHz 5G band, which comes under the 5G band of frequency. The proposed and designed antenna gives the input match of -10.74 dB, and 5.99 dB gain at the design frequency of 5.045 GHz. These outputs are usable for the 5G applications. The antenna is simulated and developed in a radio technology design software Sonnet
The growing use and impact of artificial intelligence technologies in the tourism industry
Full text linkThe research relevance is determined by the increasing role of artificial intelligence in the tourism business, which was demonstrated during the outbreak of the COVID-19 pandemic in Bali, resulting in a decline in the number of tourists visiting the island. The research aims to investigate the real-life experience of applying artificial intelligence systems in the tourism industry to address the challenges of developing the tourism industry in Bali, Indonesia. The basis of the methodological approach is a combination of theoretical methods of analysis and synthesis of the collected information covering the practical experience of the application of artificial intelligence systems in the tourism industry, as well as a survey of customers of travel agencies that have used such systems in trips to Bali. The research results show that artificial intelligence can significantly help the tourism business in Bali, as the number of tourists visiting the island dropped by 40% during the pandemic, resulting in a reduction in the number of tourism staff. The practical application of systems based on artificial intelligence opens up a wide range of business opportunities, as it allows for optimizing the activities of tourism firms and providing customers with high-quality services with highly technical equipment. The use of neural network mathematical models of tourist firms’ activity based on AI, allows them to achieve high speed of data processing, which allows tourist firms numerous competitive advantages and significantly improves the quality of their services. The practical significance of the results of this scientific research lies in the possibility of their application in the organization of the activities of enterprises in the sphere of tourism business, built on the use of digital technologies and systems based on artificial intelligence
Generative AI: Challenges to higher education
Full text linkGenerative Artificial Intelligence has rapidly expanded its footprint of use in educational institutions. It has been embraced by students, faculty, and staff alike. The technology is capable of carrying out a sustained sequence of interactive dialogs and creating reasonably meaningful text. Not surprisingly it seems to be routinely used by faculty to generate questions and assignments, by students to submit assignments and aid in self-learning, and administration to create manuals, memoranda, and policy documents. With its potential to lead to significant social innovation, tethering on the verge of becoming a disruptive technology, it seems most unlikely that it will fade away without being fully enfolded into almost all aspects of academic and pedagogical activity. While it is early to predict the exact place of this technology in education, we present thoughts to aid deliberations and give a brief review of the opportunities and challenges