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Advanced Engineering Science

Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-22-09-2022-326

Abstract : In recent decades, high strength concrete (HSC) has been widely used in concrete structures, especially in elements subject to severe compressive stress, such as centrally loaded columns. The present work aims to experimentally study the performance of (HSC) rectangular reinforced concrete (RC) columns with symmetrical and asymmetrical reinforcements under eccentric load, and compare them with similar cases of normal-strength concrete (NSC) columns. The main studied parameters are, compressive strength of concrete, distribution of longitudinal reinforcement and eccentricity of load. The effect of these parameters on the column ultimate load, mid-height displacement, and column cracking patterns are presented. All columns have the same longitudinal and transverse reinforcement ratios, as well as the same column section dimensions. According to the findings, increasing the concrete compressive strength resulted in significant gains in column load capacity with a reduction in the mid-height displacements at peak load. For column with high concrete strength and higher eccentricity, the failure load of the column, with asymmetrical reinforcement was appreciably raised compared with the case of symmetrical reinforcement. The increase in concrete strength caused the failure load of the column to grow more for columns with asymmetrical reinforcement and higher eccentricity..
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Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-16-09-2022-319

Abstract : The provision of inexpensive renewable power generation systems is a good alternative in supplying electricity in various regions. This study examines the financial feasibility of a design with variations in discharge and head for a micro hydropower plant (MHP) in an off-grid management area in villages in Jember Regency. The development of these 4 cases uses 2 MHP locations that are simulated with turbine variations, then their feasibility and sensitivity are analyzed to get the optimal design. By changing the turbine to be more efficient, the percentage increase in NPV and IRR in cases 1 and 2 is greater than in cases 3 and 4, with an increase in NPV of 15.18%, IRR by 8.12%. On the other hand, the percentage increase in BCR in cases 1 and 2 was slightly smaller than in cases 3 and 4 with a value of 4.32%. These results can be used as a reference in determining the location of the MHP and turbine type preferences..
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Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-15-09-2022-317

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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Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-14-09-2022-315

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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Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-05-09-2022-307

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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