Abstract : This research investigates the effect of the fatty acids of coconut oil and palm on the performance of the flame in the combustions. This is significant as a reserve of the fossil fuels used in environmentally friendly vegetable oils. The two vegetable oils tested were coconut and palm. This experimental study observed the combustion characteristics by igniting a droplet of vegetable oils in type k thermocouple. The burning characteristics of the droplets were identified from the flame and temperature images, using the high-speed camera of 120 fps. The results showed that palm oil fuel experienced an increase in the value of flame temperature, flame height, ignition delay, and evolution of burning droplets compared to coconut oil. The maximum flame temperature value was 734 °C, the flame height was 43.04 mm, and 8150 milliseconds were at ignition delay time. This happens because of vegetable oils. The properties of fatty acids affect the combustion characteristics as a manufacturer of the heat energy. Industrial furnaces require high temperatures, vegetable oils have high unsaturated fatty acids, very suitable for stabilizing the combustion speed..
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Abstract : Bawang dayak (Eleutherine palmifolia(L) Merr) is a local plant of Kalimantan (Indonesia) which is traditionally a spice and medicinal plant. The infusa of the bulb is exceptionally rich in phenolic and flavonoid as a phytochemicals compound. As a natural product, it has an excellent potential candidate to be the source of phenolic compounds for kefir manufactured into functional food products. The physicochemical, microbiological, and sensory quality was determined for kefir drink supplemented with bawang dayak (Eleutherine palmifolia(L) Merr) infusa at different concentrations (0, 1, 2, and 3%). Based on the study's results, kefir drink supplementation with bawang dayak (Eleutherine palmifolia(L) Merr) infusa maintained the nutritional, microbiological, and sensory quality of kefir drinks. A functional characterization exceptionally increases the phenolic compounds and DPPH scavenging activity of the kefir drink. The phenolic content of kefir drink is 90.21-113.22 mg GAE/g). Furthermore, DPPH scavenging activity was 46.46-49.91%. The antioxidant activity of bawang dayak (Eleutherine palmifolia(L) Merr) infusa showed its specific nutritional value and therefore had the potential as a source of natural antioxidants..
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Abstract : A good ability to hear is one of the important senses of a human being. Loss of hearing has various effects to the life of a person. A hearing-impaired person will have less social communication, fewer educational and job opportunities. Also, he faces emotive problems caused by a reduction in self-confidence. So, a need of designing an optimal hearing aid is very much necessary to solve the problem of hearing loss. In this paper a design of optimal ten sub band Finite Impulse Response filter bank is designed for the hearing aid. Hamming window is preferred to design the FIR filter than other windowing techniques owing to its relatively sharp main lobe width and also the first few lobes have good attenuation. The filter bank is designed with variable bandwidths by changing the center frequency and bandwidth. So instead of using a fixed bandwidth design, the filter bank bandwidths can be altered according to the audiogram of hearing-impaired person. This leads to design of a highly qualitative design compared to fixed bandwidth designs with high audiogram matching and less matching error..
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Abstract : The emission of H2S gas is one of the main reasons for workers' death. The study area is a network of the Al-Hur area in Karbala city-Iraq. To assess the emission quantity of hydrogen sulfide, TOXCHEM program software was adopted to simulate three different diameters 630 mm, 315 mm and 1000 mm, the length of these pipes was 1000 m for each diameter. The methodology was built by collecting samples for the selected pipe diameters and the other necessary data to be included in the proposed model for a whole year. This model was calibrated within spring, and the model was validated for the other seasons. Model results are very close to the actual case by applying a statistical method, where the magnitudes of (R2) and RMSE close to 1.0 and 0.0 respectively. In addition, sensitivity analysis was studied with different levels of discharge, pH, temperature, slope, and roughness coefficient. Overall results showed that all emissions in these networks give us a high warning particularly, in summer. The study contributed to knowing the fatal rate and emission of hydrogen sulfide gas in the networks by using a TOXCHEM model. Another conclusion is to reduce hydrogen sulfide emissions in sewer networks by raising the value of pH..
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Abstract : The impact of COVID-19 has affected many sectors across the world. One such sector that was affected was schools and educational institutes. Many schools and educational were closed and students were attending the online classes through the various initiatives taken by the institutes like online classes, radio programs etc., This paper helps the education institutes to conduct the online examination system for students from anywhere using available resources at present and in future..
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