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Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran
Published by Universitas Negeri Semarang
ISSN : 02165631     EISSN : 25276964     DOI : https://doi.org/10.15294/rekayasa
Core Subject : Engineering,
Engineering
REKAYASA journal publishes exciting articles from all fields of research and Engineering Science. The journals primary focus is on research practice and engineering processes utilizing biomass or factory waste. The engineering journal is an open-access peer-reviewed journal that publishes articles from all areas of Engineering and Science research.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 10 Documents
 1 
Search results for , issue "Vol 18, No 2 (2020): December 2020" : 10 Documents clear
Extract Of Nuts As A Natural-Nitrogen Source In The Making Of Cane Nata Febriani, Anggun Safitri; Paramita, Octavianti
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 2 (2020): December 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i2.24009

Abstract

Natural nitrogen sources derived from the extracts of green beans, soybeans, and peanuts used for making sugarcane juice have been studied. Organoleptic quality for nata was analyzed by indicators of color, texture, aroma, and taste. The level of community preference for sugarcane juice on sugarcane juice is observed in the community. The data analysis method used single classification Variance Analysis for selection using descriptive analysis, fiber content using proximate analysis, and protein content using the Kjeldahl method. The single classification variant analysis results show significant differences in the aspects of color and texture. The results of the community preference test were selected nata using ZA protein. The amounts of fiber and protein in the sugarcane juice and green bean extract samples were 0.79% and 24.319%, respectively, as best results. Other sugarcane juice's fiber and protein content is lowest than 0.68% and 5.359%, respectively. The best quality organoleptic qualities were samples with fertilization using ZA and green beans. The observation results showed that the sugar cane juice with green bean extract was more acceptable to the community and had better nutritional content.
Water Content and Proximates in The "Gedong Kendal" Coffee Variety after Processed by Roasting Machine Kriswanto, Kriswanto; Wiratama, Bayu; Wulansarie, Ria
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 2 (2020): December 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i2.27545

Abstract

One of the coffee producers in Indonesia, namely Gedong Koffee Patean, still uses conventional roasting with uncontrolled temperature, resulting in uneven color and content. The variants of coffee beans available are Kopi Rakyat, Kopi Lanang, Robusta Fermentasi, Robusta Fermentasi 1, Excelsa Natural Dry, Robusta Natural Dry with different characteristics. The Godeng Kendal coffee association was given a roasting machine for roasting coffee bean products and analyzed for water, carbohydrate, protein and fat content The quality of coffee is affected by the roasting process with a 5 kg roasting machine which can be set to 200 for 25 minutes. The quality of coffee after roasting then has an average moisture content of 10.5%. Furthermore, the chemical properties of each variant were tested to obtain carbohydrate, protein, and fat content at the Laboratory of Biology. Analysis of carbohydrates using the Luff Schoorl method, protein using the kidney test, and fat using a soxhlet extractor. The test results show that the highest carbohydrate content is found in Robusta Fermentasi, which is 14.4%, the highest protein content is from Kopi Lanang, which is 26.6%. The lowest fat content is in natural dry coffee, with a fat content of 4.3%.
COMMUNITY EMPOWERMENT TO PURIFY USED COOKING OIL FROM ACTIVE CARBON BANANA PEELS IN PAKINTELAN VILLAGE Gustaman, Fulia Aji; Putri, Radenrara Dewi Artanti; Rengga, Wara Dyah Pita; Damarjati, Haris; Sukma, Irawan
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 2 (2020): December 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i2.26560

Abstract

Conditions The people of the Pakintelan area in village locations have a livelihood of selling cat rice, meatballs, and selling fried food. The repeated use of used cooking oil for frying is damaging human health to cause cancer. The availability of banana peel waste can be found at fried food sellers. This activity aims to increase the cooking oil user community's understanding and purify cooking oil by adsorption of activated carbon, and it can be reused. Increase public knowledge that banana peels can activate charcoal as a cooking oil purifier in the adsorber column. The method used is the socialization and education of conservation on the manufacture of activated carbon and the adsorption of cooking oil with a specific acid number. The results are by SNI and can be reused. Checking the results of purification and evaluation is carried out. Understanding the population using new cooking oil at week 4 reaches 83% of the samples tested. Cooking oil that is used at least five times is adsorbed with an acid number of 0.6. Products can benefit people's health, reduce cooking oil spending and increase knowledge and skills in purifying used cooking oil.
The Processing of Industrial Tofu Dreg Waste into Animal Feed in Sumurrejo Village, Semarang Kusumaningtyas, Ratna Dewi; Hartanto, Dhoni; Prasetiawan, Haniif; Triwibowo, Bayu; Maksiola, Masni; Kusuma, Andre Dianata Hogi; Fidyawati, F; Mezaki, Naufal Mudrik; Mutaqin, Afrizal Mai; Loveyanto, Rendy Okta
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 2 (2020): December 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i2.27278

Abstract

Tofu is famous as a favorite, healthy, nutritious and cheap food in Indonesia. The tofu industry has been growing rapidly in this country in the form of household scale businesses or MSME (Micro, Small and Medium Enterprises). Among the tofu MSME centers in Semarang is the one in Sumurrejo Village, Gunungpati District. Sumurrejo village has various business potentials that are capable of driving the community’s economy, especially the entrepreneurship of tofu and tempeh MSMEs, as well as dairy and beef cattle farming. The MSMEs in this area are growing rapidly and able to improve the economy of the local community. In spite of this positive impact, the existence of tofu industry also has a negative effect since its waste causes environmental pollution problems. One of them is tofu dreg waste which can cause pollution to the environment due to its bad smell, organic matters content, and putrefaction potential. One effort to overcome this problem is to process the tofu dreg waste into animal feed. Tofu waste has high nutritions which consist of 8.66% protein, 3.79% fat, 51.63% water and 1.21% ash. Therefore, in order to resolve the environmental problems caused by the disposal of tofu waste and the problem of the high price of commercial animal feed, it is necessary to conduct community service activities to increase the added value of tofu waste by processing it into animal feed through fermentation process. Tofu pulp fodder produced in this activity was also tested on chickens. Chickens that were feed with tofu waste shown a better weight gain than those given regular fodder (pur). Training on tofu waste processing into fodder was very useful for the community within the area of the tofu industry in Sumurrejo Village because it could overcome the environmental problems caused by tofu dreg waste and could provide cheap, nutritious, safe animal feed and support the livestock growth. Community service activities were conducted by providing knowledge and skills through lecturing, practice and skills training, as well as monitoring activities.
Air Quality Monitoring System in Semarang City Based on IoT Mashuri, Agus Alwi; Zulfa, Nely
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 2 (2020): December 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i2.27804

Abstract

Air is one of the most important elements of life for living things in the world. For humans, the air is an element that is very concerned because it is related to health. In the city of Semarang, the Air Pollution Standard Index (ISPU) at the KLHK station (Ministry of Life and Environment) Semarang City recorded a PM 10 of 7 while the air quality in Jakarta was monitored by the Air Quality Index (AQI) of 67 with parameters in the form of very small pollutant particles with a diameter less than 2.5 micrometres (PM 2.5). The Indonesian government has made efforts to reduce the air pollution index, such as reducing the number of vehicles with odd-even systems, users of environmentally friendly transportation modes such as BRT and Trans Central Java and clearing green lands in the middle of the city. The purpose of this research is how we make a tool that can determine the quality of the air around us and can be carried (portable) anywhere easily. Following the 4.0 industrial revolution that everything has been integrated with the Internet of Things (IoT) technology where the community can find out the air condition in real-time. In this research, later using the prototype method as a test. The main components are sensors consisting of MQ-6 (CO2 and smoke), MQ-7 (CO, LPG, CH4), MQ135 (Butane, AirQuality), and DHT-11 (Humidity, temperature) From the research that has been done where the air quality in urban areas has a low air quality index by measuring using a prototype consisting of a gas sensor and Arduino microntroller, which has been made to produce an average CO2 of 25 ppm, CO 2330 which has exceeded the threshold, while NH3 1.23 and C4H10 1120 are still below the threshold. These values are influenced by pollutants generated by transportation such as motorbikes, cars, and land transportation.
The Processing of Industrial Tofu Dreg Waste into Animal Feed in Sumurrejo Village, Semarang Kusumaningtyas, Ratna Dewi; Hartanto, Dhoni; Prasetiawan, Haniif; Triwibowo, Bayu; Maksiola, Masni; Kusuma, Andre Dianata Hogi; Fidyawati, F; Mezaki, Naufal Mudrik; Mutaqin, Afrizal Mai; Loveyanto, Rendy Okta
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 2 (2020): December 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i2.27278

Abstract

Tofu is famous as a favorite, healthy, nutritious and cheap food in Indonesia. The tofu industry has been growing rapidly in this country in the form of household scale businesses or MSME (Micro, Small and Medium Enterprises). Among the tofu MSME centers in Semarang is the one in Sumurrejo Village, Gunungpati District. Sumurrejo village has various business potentials that are capable of driving the community’s economy, especially the entrepreneurship of tofu and tempeh MSMEs, as well as dairy and beef cattle farming. The MSMEs in this area are growing rapidly and able to improve the economy of the local community. In spite of this positive impact, the existence of tofu industry also has a negative effect since its waste causes environmental pollution problems. One of them is tofu dreg waste which can cause pollution to the environment due to its bad smell, organic matters content, and putrefaction potential. One effort to overcome this problem is to process the tofu dreg waste into animal feed. Tofu waste has high nutritions which consist of 8.66% protein, 3.79% fat, 51.63% water and 1.21% ash. Therefore, in order to resolve the environmental problems caused by the disposal of tofu waste and the problem of the high price of commercial animal feed, it is necessary to conduct community service activities to increase the added value of tofu waste by processing it into animal feed through fermentation process. Tofu pulp fodder produced in this activity was also tested on chickens. Chickens that were feed with tofu waste shown a better weight gain than those given regular fodder (pur). Training on tofu waste processing into fodder was very useful for the community within the area of the tofu industry in Sumurrejo Village because it could overcome the environmental problems caused by tofu dreg waste and could provide cheap, nutritious, safe animal feed and support the livestock growth. Community service activities were conducted by providing knowledge and skills through lecturing, practice and skills training, as well as monitoring activities.
Air Quality Monitoring System in Semarang City Based on IoT Mashuri, Agus Alwi; Zulfa, Nely
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 2 (2020): December 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i2.27804

Abstract

Air is one of the most important elements of life for living things in the world. For humans, the air is an element that is very concerned because it is related to health. In the city of Semarang, the Air Pollution Standard Index (ISPU) at the KLHK station (Ministry of Life and Environment) Semarang City recorded a PM 10 of 7 while the air quality in Jakarta was monitored by the Air Quality Index (AQI) of 67 with parameters in the form of very small pollutant particles with a diameter less than 2.5 micrometres (PM 2.5). The Indonesian government has made efforts to reduce the air pollution index, such as reducing the number of vehicles with odd-even systems, users of environmentally friendly transportation modes such as BRT and Trans Central Java and clearing green lands in the middle of the city. The purpose of this research is how we make a tool that can determine the quality of the air around us and can be carried (portable) anywhere easily. Following the 4.0 industrial revolution that everything has been integrated with the Internet of Things (IoT) technology where the community can find out the air condition in real-time. In this research, later using the prototype method as a test. The main components are sensors consisting of MQ-6 (CO2 and smoke), MQ-7 (CO, LPG, CH4), MQ135 (Butane, AirQuality), and DHT-11 (Humidity, temperature) From the research that has been done where the air quality in urban areas has a low air quality index by measuring using a prototype consisting of a gas sensor and Arduino microntroller, which has been made to produce an average CO2 of 25 ppm, CO 2330 which has exceeded the threshold, while NH3 1.23 and C4H10 1120 are still below the threshold. These values are influenced by pollutants generated by transportation such as motorbikes, cars, and land transportation.
Extract Of Nuts As A Natural-Nitrogen Source In The Making Of Cane Nata Febriani, Anggun Safitri; Paramita, Octavianti
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 2 (2020): December 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i2.24009

Abstract

Natural nitrogen sources derived from the extracts of green beans, soybeans, and peanuts used for making sugarcane juice have been studied. Organoleptic quality for nata was analyzed by indicators of color, texture, aroma, and taste. The level of community preference for sugarcane juice on sugarcane juice is observed in the community. The data analysis method used single classification Variance Analysis for selection using descriptive analysis, fiber content using proximate analysis, and protein content using the Kjeldahl method. The single classification variant analysis results show significant differences in the aspects of color and texture. The results of the community preference test were selected nata using ZA protein. The amounts of fiber and protein in the sugarcane juice and green bean extract samples were 0.79% and 24.319%, respectively, as best results. Other sugarcane juice's fiber and protein content is lowest than 0.68% and 5.359%, respectively. The best quality organoleptic qualities were samples with fertilization using ZA and green beans. The observation results showed that the sugar cane juice with green bean extract was more acceptable to the community and had better nutritional content.
Water Content and Proximates in The "Gedong Kendal" Coffee Variety after Processed by Roasting Machine Kriswanto, Kriswanto; Wiratama, Bayu; Wulansarie, Ria
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 2 (2020): December 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i2.27545

Abstract

One of the coffee producers in Indonesia, namely Gedong Koffee Patean, still uses conventional roasting with uncontrolled temperature, resulting in uneven color and content. The variants of coffee beans available are Kopi Rakyat, Kopi Lanang, Robusta Fermentasi, Robusta Fermentasi 1, Excelsa Natural Dry, Robusta Natural Dry with different characteristics. The Godeng Kendal coffee association was given a roasting machine for roasting coffee bean products and analyzed for water, carbohydrate, protein and fat content The quality of coffee is affected by the roasting process with a 5 kg roasting machine which can be set to 200 for 25 minutes. The quality of coffee after roasting then has an average moisture content of 10.5%. Furthermore, the chemical properties of each variant were tested to obtain carbohydrate, protein, and fat content at the Laboratory of Biology. Analysis of carbohydrates using the Luff Schoorl method, protein using the kidney test, and fat using a soxhlet extractor. The test results show that the highest carbohydrate content is found in Robusta Fermentasi, which is 14.4%, the highest protein content is from Kopi Lanang, which is 26.6%. The lowest fat content is in natural dry coffee, with a fat content of 4.3%.
COMMUNITY EMPOWERMENT TO PURIFY USED COOKING OIL FROM ACTIVE CARBON BANANA PEELS IN PAKINTELAN VILLAGE Gustaman, Fulia Aji; Putri, Radenrara Dewi Artanti; Rengga, Wara Dyah Pita; Damarjati, Haris; Sukma, Irawan
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 18, No 2 (2020): December 2020
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v18i2.26560

Abstract

Conditions The people of the Pakintelan area in village locations have a livelihood of selling cat rice, meatballs, and selling fried food. The repeated use of used cooking oil for frying is damaging human health to cause cancer. The availability of banana peel waste can be found at fried food sellers. This activity aims to increase the cooking oil user community's understanding and purify cooking oil by adsorption of activated carbon, and it can be reused. Increase public knowledge that banana peels can activate charcoal as a cooking oil purifier in the adsorber column. The method used is the socialization and education of conservation on the manufacture of activated carbon and the adsorption of cooking oil with a specific acid number. The results are by SNI and can be reused. Checking the results of purification and evaluation is carried out. Understanding the population using new cooking oil at week 4 reaches 83% of the samples tested. Cooking oil that is used at least five times is adsorbed with an acid number of 0.6. Products can benefit people's health, reduce cooking oil spending and increase knowledge and skills in purifying used cooking oil.

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