JOURNAL OF APPLIED SCIENCE (JAPPS)
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Published By Institut Teknologi Sains Bandung

2656-7334, 2656-7288

2021 ◽  
Vol 3 (2) ◽  
pp. 026-036
Author(s):  
Esterlita Hisamatsu

Seventh goal of the "Sustainable Development Goals (SDGs)" is clean and affordable energy to increase the proportion of renewable energy. However, power plants in Indonesia are still dominated by non renewable energy. Therefore, it is necessary to have renewable energy technologies such as photovoltaic that can be installed on-site in buildings as an alternative clean electricity supplier. Even though Indonesia has abundant sun energy, domestic photovoltaic development is relatively slow. This research aims to identify obstacles to the application of photovoltaic as an on-site electrical system in Indonesia by spreading questionnaire to experts and users. Each question in the questionnaire is related to the understanding of the three pillars of sustainability (environment, social, and economic) related to on-site photovoltaic. The results of the data will be tested using the one sample t-test method to identify the environmental barriers, social barriers, and economic barriers. The results of this study indicate that the constraints of photovoltaic as an on-site power plant are generally dominated by social and economic barriers. Meanwhile, environmental barriers are recessive.


2021 ◽  
Vol 3 (2) ◽  
pp. 037-047
Author(s):  
Jhon Viter Marpaung ◽  
Muhammad Fauzi ◽  
Desy Prastyani

The concept applied to the design of stool furniture this time carries the theme that will be used, namely Scandinavian. A product that will be designed through trend analysis, through the uniqueness of the design owned. The uniqueness is presented through a combination of foreign and traditional cultures, being a style inspiration for designers and becoming the first choice product for the community in its needs. Qualitative methods with an event approach that is carried out make a direct source for designers to conduct a renewable data research so as to gain knowledge about the style and concept of a broader design to be applied to a design design this time. Market segmentation or User is intended is an urban society that has a standardization of modern living, as well as the characteristics of users who have uniqueness in a work such as creative workers oriented in the field of art or creative. This product is intended for families who have a modern lifestyle, with the implementation of modern product styles making this design has a concept of styling organic design that is combined with the application of batak toba motifs as the preservation of cultural products to preserve cultural knowledge to make their own scandinavian-style products


2021 ◽  
Vol 3 (2) ◽  
pp. 015-025
Author(s):  
Cahyaning Kilang Permatasari

The location of tempe processing adjacent to the settlement causes problems. The resulting liquid waste makes people uncomfortable. This is presumably because the liquid waste has not been managed properly, because it is only dumped into the drainage channel. The majority of tempe industrial entrepreneurs are home industries who are not aware of creating a healthy environment by paying attention to liquid waste processing. There are many studies on technology for the tempe industrial wastewater problem, but each technology has advantages and disadvantages. It is necessary to have a system to choose the technology that suits the waste conditions. This research takes a case study in Karanganyar Regency. The Analytical Hierarchy Process (AHP) method is a method of determining priority scale that can accommodate all aspects. Furthermore, a sequence of criteria can be arranged as needed. The results of the analysis with AHP are: technology criteria 31.09%; environment 28.65%; economic 21.74% and social 18.53%. Environmental sub-criteria showed the results of the removal of ammonia 40.56%; treated water quality 30.74%; the amount of mud is 18.91% and the emission level is 9.80%. Technology sub-criteria are ease of operation 28.67%; land area requirement 28.56%; service life of 28.05% and the potential of technology in the midification of 14.72%. Economic sub-criteria with the results of operating costs 34.21%; installation cost 33.28%; maintenance costs 23.78% and HR costs 8.73%. Social sub-criteria with the results of the need for employment of 49.10%; readiness of human resources 19.33%; implementation of construction 16.74% and aesthetics 14.82%. The results of the AHP can be used as input for tempe entrepreneurs, the government and the community to improve the environmental quality of the tempe industrial wastewater. It is hoped that entrepreneurs will find it easier to determine the appropriate technology to treat the tempe industrial liquid waste.


2021 ◽  
Vol 3 (2) ◽  
pp. 057-068
Author(s):  
Asep Irwan

Muara Angke Wildlife Reserve (MAWR) is the smallest natural reserve area in Indonesia with a wetland ecosystem type, dominated by open swamp and mangroves, and greatly influenced by freshwater from the Angke River. Although small, this region plays an important role in protecting biodiversity, especially for mangrove ecosystems in Jakarta. However, this area has suffered severe degradation because of river pollution and decreasing salinity so that rehabilitation efforts carried out to maintain the presence of mangrove ecosystems. We asses the hydro oceanographic aspects, i.e. tidal conditions, sedimentation and bathymetry by conducting field survey and modeling. Based on the results, there is 0.35 m increase in the water level compare to previous period. The value of Formzhal 2.47 is obtained which indicates the mixed tide prevailing diurnal type, mainly because of the influence of the river, although sometimes their mixed tides with very different heights and periods. The tidal mounts in Muara Angke based on the Admiralty method are 0.94 meters. Then, from the results of the sediment test, it was found the type of mud sediment with a value of TSS between 23 mg/l - 74 mg/l. The result of this study is that the sustainability of the mangrove ecosystem in Muara Angke Wildlife Reserve depends on these three aspects. There needs to be mitigation efforts to reduce sedimentation and overcome freshwater immersion from rivers so that mangrove rehabilitation in this region can be successful.


2021 ◽  
Vol 3 (2) ◽  
pp. 048-056
Author(s):  
Lia Laila

Steam is a utility that have an essential function in palm oil production. Steam is mainly used in steam turbine to move the generator to produce electricity. Steam also has a lot of other functions such as heating cold oil in storage tank, heating coil in kernel drying, etc. Steam is produced in a machine called boiler. Boiler require a treated feed water as an input. To maintain boiler performance and lifetime, one need to control the TDS (Total Dissolved Solid) in boiler feed water in a range of 2100 2500 ppm. TDS is a parameter that shows the solid concentration which dissolved in the water. TDS has to be checked every hour to maintain its concentration controlled. In a practical use, TDS monitoring is a simple process but take a lot of time to proceed. Water from the sampling pipe collected in a bottle then cooled until room temperature. TDS from cooled boiler water then measured with a device called TDS meter. To control TDS value in the standard condition, the measurement time need to be reduced. Therefore, a faster method to measure TDS in boiler water is needed. An easier and faster measurement using a system which consisted of sensor, microcontroller, LCD display is one of the idea to reduce unneccessary measuring time. The development and experiment of this TDS monitoring device is situated in Nagasakti Palm Oil Mill, Riau Province, Indonesia.


2021 ◽  
Vol 3 (1) ◽  
pp. 020-032
Author(s):  
Annisa Annisa ◽  
Leonardus Bambang Budi Prasetyo

The enormous number of Cawang-Cikarang toll road private vehicles users have caused congestion in Jakarta. To reduce congestion in Jakarta, suburban areas, such as Cikarang, commuters shall utilize Park and Ride (P&R) facilities than use private vehicle to Jakarta. This study is important to give the commuters information of P&R in Cikarang, so they can make an option of their trip. P&R facility has a main function as a hub to change from private vehicle to public transportation. Observation as well as questionnaire were used to reveal findings for this study, the data results are analyzed with descriptive statistics. This study revealed that users of P&R facilities from Cikarang are generally commuters who have offices in urban areas and reside in suburban areas. The problem that occurs in Cikarang is that parking facilities in transit locations (stations / terminals / stops) have not been utilized optimally. This study aims to analyze the actual state and user satisfaction of P&R facility in Cikarang. The six locations include: (1) Cikarang Station; (2) Metland Telaga Murni Station; (3) Lemahabang Station; (4) Cikarang Terminal; (5) Capitol Stop; and (6) AO Citywalk Lippo Cikarang Bus Stop. The results showed that the majority of respondents (N=231) were satisfied (m=3.78; SD=0.99, p


2021 ◽  
Vol 3 (1) ◽  
pp. 059-063
Author(s):  
Aini Hariyani Nasution ◽  
Rini Octavia Nasution ◽  
Desy Marlyn Situmorang ◽  
Andrie Harmaji

Hydroxyapatite has been widely used as bone graft materials in periodontics. However, hydroxyapatite is still considered costly, and many of them are imported. Hydroxyapatite manufacturers from natural sources could be an affordable alternative for periodontal regeneration therapy. Pugilina cochlidium and Babylonia spirata, L are the natural sources with high calcium carbonate. The two clamshells are easily found in Indonesia but their usage is still limited as hydroxyapatite materials. This study aims to synthesize the hydroxyapatite with sol-gel method from Pugilina cochlidium and Babylonia spirata, L as bone graft materials candidates.


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