Cilt 13, Sayı 1 (2023)

An overview of the conventional synthesis of biomass-derived nanocomposites and applications to systems for energy and the environment

Sun, 01 Jan 2023 00:00:00 GMT

An overview of the conventional synthesis of biomass-derived nanocomposites and applications to systems for energy and the environment OYEKALE, Joseph Biomass-derived nanocomposites are very tiny carbonated solid materials synthesized by fusing metallic compounds with different types of plant-based materials, either in their raw forms or after processing into other substances such as biochar. This chapter aims to succinctly describe the principles often applied in the literature for the synthesis of biomass-derived nanocomposites. Furthermore, the most common applications of biomass-derived nanocomposites in the areas of sustainability of energy and the environment are summarized. The roles of bio-nanocomposites in the advancement of energy storage systems, supercapacitors, and hydrogen production through fuel cells are in focus for sustainable energy applications. For the environmental sustainability potential, emphasis is placed on the applications of the bio-based nanocomposites for environmental remediation and carbon-capture purposes by mitigating CO2 emission through CO2 sorption and sequestration.

Sentiment analysis in social networks of health institutions

Sun, 01 Jan 2023 00:00:00 GMT

Sentiment analysis in social networks of health institutions ÇONAK, Özge; ÖNDER, Emrah Twitter, a communication platform that creates a social impact; it conveys the messages of non-profit organizations to the masses and the emotions of the masses to non-profit organizations. This research; It aims to examine Twitter posts about health-related non-profit organizations, to determine the emotional states about these institutions on social media and to measure these feelings. Sentiment analysis about WHO, ILO, IOM, UNICEF, FAO, Red Cross, UNDP and UNHCR were carried out using the R program. The tweets used in sentiment analysis were collected by approval of Twitter API. During the study, a total of 310,341 tweets were collected in three periods, November 2019, May 2020 and October 2020. Tweets are classified according to 10 different emotions. One of the main findings of the study is that “positive”, “trust” and “anticipation” feelings are at the top of the tweets shared about these institutions under normal conditions and crisis conditions. Sentiment consistency was tested with Friedman test for each institution after emotional analysis was performed in all institutions (p<0.05). In all institutions except FAO, a significant relationship was found between the emotion medians of the feeling of “fear” according to the periods. However; according to the results of the sentiment analysis, an increase was observed in the “fear” feeling of the institutions during the pandemic period. This research; non-profit international organizations that make environment, health and sustainable development a principle; provides a conceptual framework for understanding when and why follower behavior originates. Thus, it can enable organizations to realize their missions, create meaningful support in times of crisis, increase benefit and awareness, facilitate decision-making, and increase communication and interaction

VIBRO-ACOUSTIC ASSESSMENT OF GRAIN GRINDING MACHINE FOR HEALTH RISK FACTORS ANALYSIS

Sun, 01 Jan 2023 00:00:00 GMT

VIBRO-ACOUSTIC ASSESSMENT OF GRAIN GRINDING MACHINE FOR HEALTH RISK FACTORS ANALYSIS AMİNE, Joel Daniel; AZODO, Adinife Patrick; OWHOR, Sampson Chisa Grinding machines is one of the outcomes of the agricultural sector work process mechanization aimed at reducing tedium and drudgery on the workers and improving overall productivity and production. However, the machinery drive component and mechanical energy are associated with noise and vibration, thereby inducing safety and health concerns for the operators. This study assessed and compared the vibro-acoustic characteristics caused by three different types of grinding machines; electric motor (3HP220V2800HD), diesel (R175A) and petrol (GX160) power drive engines used in grinding shops located in Wadata, Makurdi Local Government Area of Benue State in association with the risk factors to the work environment. The instrumentation design for the grinding machine operations vibro-acoustic characterization was a sound level meter (S844+), a vibrometer (VM-6360), a digital stopwatch (PC-396) and retractable measuring tape (B300-AG). The noise measurements were made at an average seating height of 1.5 m in the operator’s work position and the vibrations on the seat surface of the operator. The data obtained were analyzed for noise and vibration occupational risk exposure following the ISO 9612 for acoustics guidelines and ISO 2372 for mechanical vibration and shock. The average mean values for the noise level and vibrations were statistically highest when the diesel power drive engine, followed by the petrol engine, while the electric motor had the least vibro-acoustic effect. In addition, the analysis of the variance test showed that the result obtained for the vibration and noise levels for the three categories of power source drive had p-values less than 0.05, indicating that they are significantly different from zero at a confidence level of 95%. The findings of this study mandated that all operators of the machinery under investigation wear personal protective equipment (PPE).

PRODUCTION AND INVESTIGATION OF THE MECHANICAL PROPERTIES OF POLYPROPYLENE-BIOSILICA COMPOSITES

Sun, 01 Jan 2023 00:00:00 GMT

PRODUCTION AND INVESTIGATION OF THE MECHANICAL PROPERTIES OF POLYPROPYLENE-BIOSILICA COMPOSITES SUDİ, Solomon Daniel; MSHELIA, Richard Balthi Polypropylene (PP) as thermoplastic has found use in the production of a variety of items due to its low cost and ease of production. However, its usage is limited to inherent in its mechanical properties. Rice husk which is readily available and underutilize is considered a major source of biosilica (BS) after calcination. Therefore, the incorporation of biosilica into polypropylene resin as a composite will further reduce the cost and improve its properties. This research developed Polypropylenebiosilica composites with varying compositions of BS and their mechanical properties were determined using ASTM standard test methods. The results of the mechanical test showed a significant increase in Young’s modulus from131.08 MPa at 0wt% to 224.86 MPa at 20wt% and flexural modulus from 1055 MPa at 0wt% to 1936.36 MPa at 20wt%. However, a decrease in tensile strength from 30.61 MPa at 0wt% to 24.78 MPa at 5wt% and percent elongation from 24 at 0wt% to 12.4 at 5wt% was recorded. Also, a decrease in Impact strength from 0.26 J at 0 wt% to 0.225 J at 5wt% and hardness value from 23.46 HV to 22.00 HV was observed. It was deduced from the results that polypropylene-biosilica composite is suitable for applications where rigidity is required.