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Internet and social media have become an inseparable part of everyday life. In April 2022 in Indonesia there were 191.4 million active users of various social media platforms. 99.9 million of them are Instagram users. This situation is a new opportunity for business actors, especially Ryanza Bakery to market their products online. Online product marketing has many benefits including being able to increase sales significantly, expand marketing reach, and can cut marketing costs. This study aims to provide knowledge and optimization of the use of Search Engine Optimization (SEO) and Instagram Tags for Ryanza Bakery products marketing. The results show that SEO and Instagram Tags have a great opportunity to increase the business capacity and profits of Ryanza Bakery. [ABSTRACT FROM AUTHOR]

When the child has entered school age, working memory components can help children keep information or instructions in mind during classroom activities and then use them to solve problems. Therefore, stimulation of working memory development is something that needs to be given to children to be able to support the improvement of academic abilities at school more smoothly. This study aims to determine the effectiveness of using smart memory cards to improve working memory abilities in children aged 5-12 years. This research uses pre-experimental designs. The results showed that there was an increase in the score obtained by the subject after being given treatment using SMC media, and that the average posttest score for both visual spatial WM and verbal WM was higher than the average pretest score. [ABSTRACT FROM AUTHOR]

Periodontal disease, especially dental caries, is the most common disease that occurs in the oral cavity. Poor awareness of oral hygiene leads to tooth decay that usually ends with tooth extraction. Dental caries is caused by the accumulation of microbes, including bacteria in the oral cavity. The electronic nose is one of the methods that can be used for early detection of oral and dental diseases with gas array sensors. This article discusses the role of bacterial types and odor for the early detection accuracy of bacteria with gas array sensors. Study of e-nose application to detect the odor-based bacterial growth, taken from Pubmed, Web of Science, and Scopus. The results of article reviews from reputable international journals showed that the TGS Metal Oxide Sensor (MOS) was able to identify gases formed by bacteria with more than 95% accuracy. In its implementation, the PCA computational analysis method is proven to be able to distinguish gases produced by bacteria properly. E-nose, with various computational analysis methods, has shown to be able to identify gases emitted by various bacterial and odors with a reasonably high accuracy value, namely in the range 80-90%. [ABSTRACT FROM AUTHOR]

Corncob is an agricultural waste which has a potential to be utilized as a raw material for bio-oil. One of many processes to convert the agricultural waste (biomass) into bio-oil is pyrolysis. The pyrolysis process for this study was carried out using fixed bed pyrolysis reactor, performed under temperature of 500°C and 600°C with residence time of 4 seconds. The bio-oil was analyzed for its components content using Gas Chromatography-Mass Spectrometry (GCMS). The separation of phenolic compounds from bio-oil was done by a liquid-liquid extraction which carried out for 60 minutes using methanol 80% and chloroform as solvent at various extraction temperatures of 30°C, 40°C, 50°C, and stirring speeds of 200 rpm, 250 rpm, 300 rpm. Then, the extract phase and the raffinate phase were analyzed using Folin-Ciocalteu method. The aim of this study was to determine the effect of temperatures and stirring speeds of the liquid-liquid extraction to the distribution coefficient and the yield of phenolic compound. The result showed that the main component of bio-oil obtained is phenolic compounds. The highest distribution coefficient and the highest yield of phenolic compound were obtained at 50°C and 300 rpm. The highest yield was 66.31% and 58.9% obtained from pyrolysis process at 500°C and 600°C, respectively. Meanwhile, the highest distribution coefficient was 11.08 and 8.92 for pyrolysis at 500°C and 600°C. [ABSTRACT FROM AUTHOR]

In-situ ethyl biodiesel production from rice bran under subcritical water and ethanol with no catalyst was employed. This process is environmentally friendly and is very flexible in term of feedstock utilization since it can handle relatively high moisture and free fatty acids (FFAs) contents. In addition, the alcohol, i.e. bioethanol, is a nontoxic, biodegradable, and green raw material when produced from non-edible biomass residues, leading to a 100% renewable biodiesel. The fatty acid ethyl esters (FAEEs, ethyl biodiesel) are better than fatty acid methyl esters (FAMEs, methyl biodiesel) in terms of fuel properties, including cetane number, oxidation stability and cold flow properties. The influences of the operating variables such as reaction time (1 - 10 h), ethanol concentration (12.5 - 87.5%), and pressurizing gas (N2 and CO2) on the ethyl biodiesel yield and purity have been investigated systematically while the temperature and pressure were kept constant at 200 °C and 40 bar. The optimum results were obtained at 5 h reaction time and 75% ethanol concentration using CO2 as compressing gas. Ethyl biodiesel yield and purity of 58.78% and 61.35%, respectively, were obtained using rice bran with initial FFAs content of 37.64%. FFAs level was reduced to 14.22% with crude ethyl biodiesel recovery of 95.98%. Increasing the reaction time up to 10 h only increased the yield and purity by only about 3%. Under N2 atmosphere and at the same operating conditions (5h and 75% ethanol), ethyl biodiesel yield and purity decreased to 54.63% and 58.07%, respectively, while FFAs level was increased to 17.93% and crude ethyl biodiesel recovery decreased to 87.32%. [ABSTRACT FROM AUTHOR]