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| Houshyar, Ehsan; Mahmoodi-Eshkaftaki , Mahmood; Ghani, Askar; Arazo, Renato. |
| This paper introduces a cheap local Ricinus communis, which grows in Jahrom, a warm region of southwest Iran, as a renewable energy source. Biodiesel production was investigated by employing CaO and C:CaO as heterogeneous catalysts and KOH as a homogenous catalyst. Conventional and ultrasonic-assisted methods were used considering different methanol to oil molar ratios (4:1, 6:1 and 8:1) and different temperatures (40 ˚C, 50 ˚C and 60 ˚C). The optimized production condition was assessed by response surface methodology (RSM). The results showed that the most suitable catalyst was C:CaO with a methanol to oil molar ratio of 6:1 and temperature of 60 ˚C. Using carbon with CaO increased biodiesel yield by around 20% compared to CaO alone. In all conditions,... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 2024 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/8941 |
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| Houshyar, Ehsan. |
| Human power is the main resource in all production units like agriculture. Suitable working condition is essential to enhance job satisfaction and productivity of human resources. Stop watch time study was used in this study for the first time in Iran's horticulture sector in order to give correct estimation of laborers' productivity for pomegranate harvesting while mechanized harvester machines are limited. The pomegranate harvesting process was broken into its seven elements. The require time for doing each element was recorded and necessary allowances for each element was obtained from time study standards tables. Ten out of 37 gardens were randomly chosen and three laborers from each garden were testes with three replications. Level of job satisfaction... |
| Tipo: Info:eu-repo/semantics/article |
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| Ano: 2023 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5087 |
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