81 research outputs found
Development of ASTRI high-temperature solar receivers
No full textThree high-temperature solar receiver design concepts are being evaluated as part of the Australian Solar Thermal Research Initiative (ASTRI): a flux-optimised sodium receiver, a falling particle receiver, and an expanding-vortex particle receiver. Preliminary results from performance modelling of each concept are presented. For the falling particle receiver, it is shown how particle size and flow rate have a significant influence on absorptance. For the vortex receiver, methods to reduce particle deposition on the window and increase particle residence time are discussed. For the sodium receiver, the methodology for geometry optimisation is discussed, as well as practical constraints relating to containment material
Antioxidant Activity and Bioactive Compounds of Ethyl Acetate Fractions from Syzygium cumini Wood Stem
Get PDFSyzygium cumini is one of the endemic plants in Indonesia that has the potential to be developed. The fruit was known to have potential as a diabetes drug. However, very few studies to determine the medicinal potential and identification of compounds of Syzygium cumini wood stem has never been studied before. Therefore, this study aimed to determine the antioxidant activity and content of compounds in Syzygium cumini wood stem ethyl acetate fraction. The crude ethanol extract was prepared from the wood stem powder of Syzygium cumini in ethanol using maceration. Furthermore, it was carried out by the liquid-liquid fractionation process using solvents of different polarity. Antioxidant activity of the crude extract, hexane fraction, and ethyl acetate fraction was determined by spectrophotometric methods using 1,1-diphenyl-2-picrylhydrazyl (DPPH). Analysis of bioactive compounds by using Thin Layer Chromatography (TLC). Identification of compounds functional groups was carried out to support the results of TLC analysis by using Fourier-transform infrared (FTIR). Ethyl acetate fraction showed the highest antioxidant activity (IC50 13,62 µg/mL), followed by ethanol extract (IC50 19,64 µg/mL) and hexane fraction (IC50 61,25 µg/mL). The antioxidant activity of the acetate fraction was lower than that of ascorbic acid with an IC50 value of 2,85 µg/mL. However, this fraction has very strong antioxidant activity. The TLC analysis results showed that the sample was thought to contain an alkaloid, phenolic, flavonoid, and terpenoid. The assumption on agreement with FTIR analysis which showed functional groups were C-H, O-H, N-H, C=O, and C=C aromatics as constituents of these compounds
THE SYNTHESIS OF GLYCEROL CARBONATE FROM BIODIESEL BYPRODUCT GLYCEROL AND UREA OVER AMBERLYST 36
Get PDFThe increasing use of biodiesel as renewable fuels leads to the increasing of glycerol amount as a byproduct of biodiesel production. One of the glycerol derivative products that is environmentally friendly and renewable is glycerol carbonate. Glycerol carbonate is commonly used as a raw material for polymers, surfactants, emulsifiers, lubricants, paints, also used in the cosmetics and pharmaceutical industries. In this study, the research was carried out by using a batch reactor with a three-neck flask equipped with reverse cooling, thermometers, mercury stirrer, and heating mantle with the conditions of the reaction temperature around 373 – 413 K, mole ratio of reactants of urea: glycerol were 1:0,5, 1:1, 1:1,5, 1:2 and 1:4 and the concentration of catalyst were 1%, 2%, 3%, 4% and 5% respectively. Reaction was done for four hours. The results showed that the formation of glycerol carbonate from glycerol and urea using a catalyst Amberlyst 36 is affected by the catalyst concentration, reaction temperature and the ratio of reactants used. The highest glycerol conversion was obtained at 55.07% at a temperature of 393 K with mole ratio of urea and glycerol 1:0,5 and the percentage of catalyst 3% of the amount of glycerol
The Opportunities of Using Malay Apple (Syzygium malaccense (L). Merr. & Perry) Wood Stem Extract as Halal and Thayyib Antidiabetic Drugs
Get PDFThe use of existing antidiabetic drugs generally causes dangerous side effects, while the use of insulin has a problem with the halal status of the ingredients. Treatment with halal and thayyib medicinal ingredients is needed by Muslims, so it is necessary to find antidiabetic drugs that are halal and thayyib. The use of natural materials such as malay apple can be a solution for halal medicine. The study on antihyperglycemic activity of extracts of malay apple stem wood have been done. Invivo studies were carried out on animal experiments in male swiss webster mice using the glucose tolerance method. The experimental results showed a decrease in blood glucose levels after feeding with extract of malay apple stem wood at doses of 100 mg/Kgbw, 200 mg/Kgbw and 400 mg/Kgbw, which were significantly different compared to the control group (p <0.05), but effective doses shown at a dose of 100 mg/Kgbw. Measurement of moisture and ash content, levels of heavy metal and microbial contamination, showed that the simplicia of malay apple stem wood is safe. The results of this study indicate that malay apple wood extract is a material that is very likely to be used as antidiabetic drugs that are halal and thayyib
Does the Workplace Environment Impact on Employee Performance?
No full textAbstract: This study aims to determine the effect of employees' Environmentally-Friendly, work environment, employee performance, and job satisfaction. The research was carried out during the 2021 Covid-19 pandemic. The research subject was 65 employees who worked at the Bali Design and Business Institute. Inferential evaluation on this examination makes use of the SEM PLS model and is processed with Smart PLS version 3.2.8 to evaluate the research model. The results showed, based on the results of the direct and indirect effects tests, it can be concluded that by testing the direct effects, all the proposed hypotheses can be retained, that is to say that there is a positive influence between respect for the environment of employees on employee performance and job Satisfaction.
Keywords: Work Environment, Employee Performance, Job Satisfaction.
Title: Does the Workplace Environment Impact on Employee Performance?
Author: Ni Kadek Suryani, Ni Komang Prasiani, Putu Astri Lestari
International Journal of Management and Commerce Innovations
ISSN 2348-7585 (Online)
Vol. 10, Issue 1, April 2022 - September 2022
Page No: 241-254
Research Publish Journals
Website: www.researchpublish.com
Published Date: 07-June-2022
DOI: https://doi.org/10.5281/zenodo.6619418
Paper Download Link (Source)
https://www.researchpublish.com/papers/does-the-workplace-environment-impact-on-employee-performanceInternational Journal of Management and Commerce Innovations, ISSN 2348-7585 (Online), Research Publish Journals, Website: www.researchpublish.co
Becoming a Culturally Relevant Feminist Teacher: an Autoethnography of an Exchange Student
Get PDFThis thesis recounts the journey of an exchange student at a public university in Central Illinois on becoming a feminist teacher. By reflecting on her experiences as a Master’s student in the United States and high school teacher in Indonesia, the author unpacks her journey on becoming a feminist teacher. The author argues for the need of a feminist lens to understand the White supremacist heteropatriarchal capitalist system that is also infused in United States educational system. Finally, this research contends for a culturally relevant feminism as viable in her home institution in North Sumatra, Indonesia
Virtual vs. Standard Strike: An Experiment
Get PDFIn this paper we compare - in the laboratory - stoppage and virtual strike. Our experiment confirms that higher wages offered by an employer lead to considerably more costly effort provision. The number of strikes, the level of efforts and average total payoffs are higher under virtual strike than under standard strike. However, when standard strike is associated with reciprocal externalities, it induces higher effort levels, higher payoffs and an extremely reduced number of strikes than virtual strike. It is unclear whether this behavior re?ects reciprocity or other forms of social preferences. However our results might explain why standard strikes rather than virtual ones are generally adopted by workers.virtual strike, cooperation, reciprocity, fairness, experiments
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