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Gorlov Water Turbine Application in Ambon, Kepulauan Maluku; A Hypothetical Project
Get PDFAs energy demand increases, it must be balanced with sufficient energy sources to support the growth of Indonesia's electrification ratio. No exception with the development of energy demand and supply on Ambon, Maluku Islands. This study uses a Renewable Energy Power Plant, a water turbine that uses ocean currents from the flow path of an artificial canal plan in Ambon, Maluku Islands. The shape of the area is interesting things to make an artificial canal as a flow path for ocean currents from the different height at that location. Due to the height difference cannot be determined with certainty, in this study, the authors vary the height difference between the sea in the east and west, it's 1m to 5m. Current modelling uses a numerical approach using the Surface-Water Modeling System (SMS) 8.1 software simulation. Then the average current velocity in the canal in each height variation obtained. The experimental data from journal references are used in calculating the turbine torque for a full-scale afterwards adjusted to the current speed generated in each variation. The turbine with the greatest torque is selected, owned by the 4-blades Gorlov NACA0012 with 25% efficiency and 9.5m turbine diameter totalling 1 uni
Analysis of the Impact of COVID-19 Pandemic on Trade and Economy of the Coastal Communities of Kenjeran Village, Surabaya Using the Fault Tree Analysis (FTA) Method
Get PDFThe coastal area as a densely populated area with high socioeconomic activity is currently experiencing impacts in various sectors due to the COVID-19 virus outbreak. However, the efforts to minimize the impact of the pandemic are still general and have not taken consider the conditions of communities in coastal areas. This analysis aims to determine the factors that cause the coastal community of Kenjeran to experience a decline and a decrease in trade and economic activity and identify the probability during the COVID-19 pandemic. The method used in this analysis is Fault Tree Analysis (FTA). The result shows that the main factors causing the decline are decreased fish sales, decreased community income, decreased activity at sea, and decreased activity of traders in the market with the probability factor of 0.2494 or 24%. Mitigation recommendations for the coastal community of Kenjeran Beach are a collaboration between the fishers and the policy of cooperation between the trade office and the marine service to conduct clustering for fishers so that they can supply scarcity of marine fish and limited marine product, also monitoring the health protocols with the swab and rapid tests for traders by permanent health servic
Effect Analysis of Post Heating Temperature Variation on Metallography and Bending Test of GMAW ASTM A53 Steel Weld Joint
Get PDFASTM A53 steel is medium carbon steel with 0.3% carbon content and is often used for pipe manufacturing. The purpose of this study was to determine the effect of post heating temperature variation on bending and metallography test on weld joint of ASTM A53 steel using the GMAW process. The electrode used is ER-70S-6. Post heating temperature variations are 250oC, 300oC and 350oC. The bending test result showed that welding with 350oC postheating temperature produce the smallest open defect value. The microstructure result showed that welding with 350oC post heating temperature produce the smallest pearlite percentage in three areas observed
Penanganan Banjir Sub-DAS Posindo Kota Balikpapan dengan Optimalisasi Penyediaan Infrastruktur Hijau
Get PDFThe Posindo sub-basin, emptying into the Ampal river, is experiencing floods, yet the city government has regularly normalized and cleaned the river. Therefore, this problem cannot be handled conventionally and generically. The research was conducted to formulate optimal flood management scenarios through a green infrastructure approach as an alternative for sustainable flood management. Two analytical methods were used to overcome the research question: the Gumbel Type I distribution to calculate rainfall return periods and HEC-HMS and HEC-RAS modeling software to simulate hydrological and hydraulic conditions. Result analysis showed an overflow discharge above the embankment along the Posindo sub-basin secondary channel by 0.38 – 1.64 m3/s. Alternative’s simulation shows that providing green open space (GOS) is crucial for maintaining water balance in the study area. The combined management scenario by maintaining a minimum GOS of 10%, storage ponds establishment, and increasing the drainage capacity adequate to reduce the overflow height
CONTEXTUALISM IN ARCHITECTURE: THE DESIGN OF OFFICE BUILDING IN HERITAGE CONTEXT
Get PDFThe discussion starts with a question regarding why most of office buildings use the international style as their building expression. The first initial investigation is carried out by studying several precedents adapted from the rationalist and modern movement era. International style has architectural characteristics such as a simple form, pure structure, simple geometry, glass wall facade, and form follows function. This style mostly shows a lack of identity that does not respond to the local value and expression. The architectural buildings become placeless and do not represent the place with specific environmental responses and identity (contextual architecture). Additionally, an office building should be able to respond to the users’ activities and their identity/characters. This paper is based on the process of design project from design thinking, design research, and design process to conceptual design proposal. Design thinking is started by asking the question “what if” the new building design proposal reverses the international style’s facts through literature studies. The goals are to create the latest concepts that express their own character and image to portray both the users' characters and the location, which is human and environmentally friendly, using contextual analysis. Next, the design process includes explaining and arguing the process from proposing the design concept to building transformation. Some methods are used to determine the ‘big idea’ and design criteria and parameters, including the first principle, domain-to-domain transfer, and responding to site. The design proposal expresses the building heritage and its atmosphere, users’ characteristics, and has low energy efficiency. The design results highlight the aspect of "value of site" and “character of the building user” are essential to create the building image and identity
Kajian Preferensi Pengguna Park And Ride Terminal Intermoda Joyoboyo Pada Tatanan Normal Baru
Get PDFPark and Ride merupakan sistem parkir yang menggunakan fasilitas ruang parkir dengan memarkirkan kendaraan pribadi, setelah itu beralih ke moda transportasi umum. Tujuan Park and Ride Terminal Intermoda Joyoboyo diperuntukkan memudahkan masyarakat untuk beralih dari transportasi pribadi ke transportasi umum, sehingga penggunaan transportasi pribadi dan kemacetan bisa dikurangi. Pada awal pembukaan Park and Ride Terminal Intermoda Joyoboyo di bulan Desember tahun 2019 mecapai penggunaan sebesar 1416 kendaraan roda 4 dan 727 kendaraan roda 2. Metode analisis yang digunakan dalam penelitian ini adalah deskriptif dengan pendekatan kuantitatif, analisis Conjoint dan Crosstab. Berdasarkan hasil analisis Conjoint menunjukkan bahwa preferensi yang diharapkan pengguna Park and Ride Terminal Intermoda Joyoboyo adalah biaya progresif, kemudahan ditingkatkan, kenyamanan ditingkatkan, keamanan ditingkatkan, menerapkan seluruh protokol kesehatan, mengurangi daya tampung moda transportasi dan pembayaran tunai. Adapun tingkat kepentingan atribut menurut preferensi pengguna secara berurutan adalah Biaya (42.878%), Kenyamanan (18.171%), Sistem Pembayaran (10.168%), Kemudahan (10.139%), Protokol kesehatan (7.473%), Keamanan (5.678%) dan Daya Tampung (5.493%). Kombinasi pilihan atribut Park and Ride Terminal Intermoda Joyoboyo memiliki keterkaitan signifikan dengan karakteristik sosio-ekonomi pengguna serta pola perjalanannya
Development of Chobmons Prototype: Cholesterol and Blood Sugar Level Monitoring System Based on Internet of Things (IoT) using Blynk Application
Get PDFIn the era of the industrial revolution 4.0, we need remote technology and products that d not created new medical waste piles. An unhealthy lifestyle can cause many diseases, either degenerative diseases, namely over rate cholesterol and blood sugar level. High cholesterol and blood sugar levels are causes of major influence on atherosclerosis, stroke, micro-vascular, and cardiovascular complications. We offer a non-invasive cholesterol and blood sugar monitoring device based on red LED and infrared light absorption using the Nellcor DS-100A sensor. This technology can help reduce cumulative medical waste and help health workers to monitor patients remotely. This study used ten random samples to calibrate cholesterol and blood sugar levels. The coefficient of determination values were 0.9580 and 0.9581, respectively, which gave excellent values so that the study is continued by collecting data. Data retrieval use 20 random sample data to measure cholesterol and blood sugar levels, the average accuracy prototype is 90.26% and 91.16%, respectively. It shows great potential in determining estimation value at cholesterol and blood sugar levels. The monitoring system can show the data on the LCD display in Blynk Application with the average time required of 1.07 s
Strength Analysis of Towing Hook Support Structure on TB. Khatulistiwa 01
Get PDFTowing hook is one of the important components of a tugboat. Its function is to tow various types of ships, namely containers, tanker ships, and even barges. This activity affects the components to undergo failure and crack, especially the support structure of the hook. Earlier research has analyzed various types of stress characteristics, namely fatigue crack, maximum stress, and maximum factor of safety aimed both at the support structure and the whole profile of the tug. The research aim is to determine the value of stress in the support structure and the safety factor brought by tensile load transferred from the towing hook. The analysis is done using finite element method in Altair Hyper Works 2019. Structural strength of the towing hook support structure is analyzed in 2 loading conditions, namely lightweight barge and full load barge. Two different approaches are used for comparison. The first approach is using barge resistance, and the second is by utilizing maximum tug horse-power to speed ratio. Maximum stress acquired in both loading conditions and both approaches is 118.64 MPa; 121.80 MPa; 230.90 MPa; 329.86 MPa respectively. The safety factor is measured using 2 criteria, BKI permissible stress criterion and BKI Material Strength criterion. Results of safety factors based on BKI permissible stress are 1.644; 1.601; 0.845; and 0.591. According to BKI Material Strength, the safety factors on both loading conditions are 3.371; 3.284; 1.732; and 1.212
BALI AGA VILLAGES DOCUMENTATION IN BANGLI REGENCY AS ARCHITECTURAL CONSERVATION AND CULTURAL HERITAGE
Get PDFThe Island of Bali is not only rich in natural conditions and landscapes but also has unique socio-cultural and architectural characteristics. This makes the island of Bali a tourism and research destination, especially the indigenous villages that are called Bali Aga. There are approximately twenty-five villages spread and lies on in the four areas of the Bangli Regency. These Bali Agavillages are unique for implementing the original Balinese traditions. Mostly the Bali Aga villages take place in the fringe ofmountains, hilly areas, and along the shores of Lake Batur. The observations on the architecture of the houses found that there arefew traditional buildings called sakaroras still extant. This cannot be separated from technological and communication developments that affect people's lives. The study aims to explore the existence of the indigenous villages in the Bangli Regency,mainly to document the architecture of traditional houses that still exist. Observations were carried out to obtain primary data regarding the architectural conditions of the sakaroras. Interviews were conducted with the village leader to get information aboutthe history, the village’s needs, and the sakaroras house condition. This study found that most sakaroras houses have been turned into a modern house style. This research implies that it is essential to document the existence of the sakaroras place, which tends to change as evidence of cultural heritage and the identity of traditional Balinese architecture. Public awareness to maintaincultural heritage needs to be encouraged through programs to foster the importance of preserving traditional houses
Synthesis of Au50Ag50 Alloy Nanoparticles From Metal Ions and Colloidal Nanoparticles Through Photochemical Reduction Methods Using Femtosecond Laser
Get PDFNanoparticles synthesized through photochemical reduction using femtosecond involve reducing agent that reduces metal ions into nanoparticles. We synthesized Au50Ag50 from metal ions and colloidal nanoparticles in four different conditions: (i) gold metal ions and silver metal ion, (ii) colloidal gold nanoparticles (AuNPs) and silver nanoparticles (AgNPs), (iii) gold metal ions and colloidal silver nanoparticles (AgNPs), and (iv) colloidal gold nanoparticles (AuNPs) and silver metal ions. Gold and metal ions were obtained from dilution of gold and silver metal salts. While gold and silver nanoparticles were obtained from gold and metal ions added into a quartz cuvette and irradiated by femtosecond laser in 10 minutes irradiation time. In the synthesis, every condition respectively mixed in 3 ml solution into a 10x10x45 mm quartz cuvette and irradiated by femtosecond laser in 5-, 10- and 15- minutes irradiation time. The result showed that Au50Ag50 alloy nanoparticles were successfully synthesized in four different conditions, and the LSPR (Localized Surface Plasmon Resonance) in 15 minutes irradiation time was observed at 454.51, 458.74, 459.60, and 457.29 nm in the condition (i), (ii), (iii), and (iv), respectively