CORRELATION BETWEEN VISUAL CHARACTERS AND SENSE OF PLACE IN KAMPUNG PELANGI SEMARANG

Kampung Pelangi Semarang is in Randusari Village, South Semarang District, Semarang City. Kampung Pelangi, formerly known as Kampung Wonosari, was a slum village, through the Semarang City Government program it has become a thematic tourist village, as an effort to improve the arrangement and increase the economic potential of Kampung Pelangi. After experiencing a change in visual character, the actions of the residents show a change in the sense of place of Kampung Pelangi. This action is reflected in changes in the sense of pride, ownership, identity, positive aspirations, and commitment of residents to Kampung Pelangi. The purpose of this study was to determine the relationship between visual characters and the sense of place in Kampung Pelangi. This research method is quantitative. Data collection using a questionnaire. The research sample is 100 residents of Pelangi village aged 25-60 years. The data analysis method used is correlation inferential statistical analysis using the IBM SPSS Statistics 26 for windows program. The results of this study found that the relationship between visual characters and the sense of place in Kampung Pelangi was positive, so that the more visual characters increased, the sense of place in Kampung Pelangi also increased

Assessment of Solar Panel Array Utilization Applied to a Fishing Vessel 20 GT

Fishermen heavily depend on fossil fuels, around 95.4%, with no apparent decrease. Rising fuel costs and declining fossil fuel supplies challenge the fishing industry. The International Maritime Organization notes that ships using fossil fuels consume 277 million tons of fuel, contributing 2.5% to global emissions (961 million tons of CO2). TReducing reliance on fossil fuels and adopting alternative sources such as solar energy is suggested to address energy issues in Indonesia; solar energy, with an intensity of 0.6 to 0.7 kW/m2, is considered promising. This study uses an experimental design methodology to evaluate the installation of solar panels on a 20 GT fishing vessel at Muara Angke Port, Jakarta. Primary data, including ship size, was collected from the field. The economic focus is on the payback period, calculated through interviews with the crew. Exhaust gas emissions were calculated using factors established by the Ministry of Transportation. The results indicate that replacing CFL lamps with LED can save energy, specifically around 5 kW on this vessel. The feasibility of installing 14 solar panels is shown, costing over 20 years of Rp. 65,100,000. The payback period is estimated at three years, and the long-term analysis of Photovoltaic Solar Panels (PLTS) over additional engine investment. Cumulative emissions from the engine in one year are 155,007 tons, making PLTS environmentally beneficial without emissions

Pra Desain Pabrik Bio Pellet dari Ampas Tebu (Bagasse) dengan Proses Torrefaction

Sebagai salah satu bentuk energi terbarukan, bioenergi memiliki prospek besar untuk dikembangkan. Ketersediaan bahan baku yang melimpah di indonesia menjadi salah satu alasan pemanfaatan energi yang bersumber dari bioenergi. Biomassa dapat langsung digunakan sebagai bahan bakar atau melalui proses pembuatan pellet untuk menghasilkan energi sekunder yaitu tenaga listrik. Potensi pasar dari usaha pellet semakin meningkat, apalagi dengan adanya program co-firing dari pemerintah untuk mencampur bio pellet dengan bahan bakar fosil memberikan peluang didirikannya pabrik bio pellet untuk memenuhi kebutuhan bahan bakar. Bio pellet merupakan salah satu bahan bakar biomasa yang memiliki kesergaman bentuk,  ukuran, densitas, dan kandungan energi. Ampas tebu (bagasse) dapat dimanfaatkan sebagai bahan baku pembuatan bio pellet karena jumlahnya yang melimpah dan belum termanfaatkan dengan baik. Pada produksi bio pellet dari ampas tebu (bagasse) ini, dipilih metode torrefaction dimana terdapat tiga tahap pada pembuatan pellet yaitu tahap pre-treatment, tahap torrefaction yaitu konversi biomasa menjadi karbon, dan tahap pelletizing yaitu mengubah torrified biomass menjasi bentuk pellet. Pabrik ini direncanakan beroperasi 330 hari/tahun, 24 jam/hari dengan kapasitas 60.000 ton/tahun dan membutuhkan bahan baku ampas tebu (bagasse) sebanyak 130.842 ton/tahun. Produk yang dihasilkan mempunyai yield 47%. Internal rate of return dari pabrik ini sebesar 14,49% dengan Payout time selama 7,5 tahun dan Break even point sebesar 26%

Analisis Transportasi Pengangkutan Sampah Kota Samarinda (Studi Kasus: Kecamatan Samarinda Ulu)

Berdasarkan data DLH Kota Samarinda tahun 2019, persentase terangkutnya sampah memiliki nilai sebesar 70,93%. Secara umum target bidang pengangkutan sampah menurut RPJMD Kota Samarinda tahun 2016-2021 sebesar 90%. Tujuan pada penelitian ini yaitu mengoptimalkan sistem pengangkutan sampah sehingga nilai persentase dalam bidang terangkutnya sampah meningkat. Dalam penelitian ini terdiri beberapa prosedur yaitu mengetahui kebutuhan transportasi pengangkutan sampah saat ini hingga 5 tahun kedepan sesuai dengan volume sampah yang dihasilkan, sistem pengangkutan dan pola pengumpulan sampah. Berdasarkan analisis didapatkan hasil pola pengumpulan berupa pola individual tidak langsung dan sistem pengangkutan yang paling sesuai yaitu berupa sistem HCS dengan kemampuan ritasi 6,05 perhari dan sistem SCS dengan kemampuan ritasi 2,45 perhari untuk waktu kerja 8 jam perhari.  Pada tahun 2022 dibutuhkan sebanyak 3 unit kendaraan dump truck dan 7 unit kendaraan armroll truck. Sedangkan pada tahun 2027 dibutuhkan sebanyak 3 unit kendaraan dump truck dan 8 unit kendaraan armroll truck kapasitas 8 m³

Studi Kinetika Adsorpsi : Pemanfaatan Limbah Biji Pepaya (Carica papaya L.) sebagai Adsorben Ion Logam Cd(II) dan Pb(II) Pada Limbah Dengan Metode Batch

Currently, papaya seed waste (Carica papaya L.) is very abundant and easy to obtain because papaya is included in the fruit group whose harvest season is throughout the year. Papaya seeds are also included in a sustainable energy source. This research aims to study the adsorption kinetics of papaya seed adsorbents on Cd(II) and Pb(II) metal ions in laboratory waste. Several innovations were made including variations in adsorbent mass, contact time and pH. Optimum absorption efficiency of Cd(II) metal occurs with an adsorbent weight of 4 grams, equilibrium time of 90 minutes and pH 7. Papaya seed adsorbent is able to absorb Cd(II) metal ions up to 0.138 mg/g with a maximum absorption of 103.66%. Whereas for Pb(II) metal occurs at the optimum condition of adsorbent weight of 1 gram, equilibrium time of 60 minutes and pH 6. These conditions are able to adsorb up to 1.037 mg/g with absorption efficiency reaching 91.31%. The results of processing the kinetic data showed that the adsorption kinetics of Cd(II) followed the Pseudo Second Order model with an initial absorption rate of 0.1710 mg/g min. Whereas for metal Pb(II) follows the Elovich model with an initial adsorption rate of 0.045 mg/g min and a covered surface area of 2.8993 (g/mg). The implementation of waste was able to adsorb 0.122 mg/g of Cd(II) metal ions with 79.42% absorption and 0.993 mg/g of Pb(II) metal ions with 99.60% absorption

Influence of adding a convex lens as a solar concentrator on the performance of solar cooker with an octagonal panel

Currently, the two most popular renewable energy is solar power and wind power. However, solar power can be harvested almost in every region for a whole year during the day because Indonesia is located at the equator with average daily radiation of 4,8 kWh/m2. One way to use solar power is used in a solar cooker. The octagonal solar cooker is combine of box type solar cooker and panel type solar cooker. The box part is made of a zincalume with a half-cylinder shape as a reflector from the octagonal reflector to the cooking tray. An addition of convex lens put under the cooking tray. In each cooking tray, 500 mL of water was placed, and the sun's radiation heated the water. Performance of solar cooker tested at 09.00 in the morning for two and half hour or 180 minute . The results show that adding four convex lenses improved the solar cooker's performance, allowing the highest temperature to rise to 86 °C and increasing efficiency to 15.9%. In comparison to an addition, only one convex lens raises the temperature to 84,3 °C with a 15.4% efficiency, while the temperature without the lens rises to 70 °C with an 11.4% efficiency

Optimizing Ocean Energy Harvesting: The Significance of Natural Frequency in Piezoelectric Generator Device Electrical Output

This study explores the significance of the natural frequency parameter in enhancing the electrical performance of a piezoelectric generator device, mainly when deployed in ocean energy harvesting. While natural energy harvesting aims to establish affordable and sustainable renewable energy sources, piezoelectric devices capitalize on the inherent piezoelectric effect derived from natural movements. Despite the abundance of constant natural movements in the Earth's environment, the application of piezoelectric devices in ocean energy remains relatively understudied. The experimental setup involves a cantilever-designed piezoelectric device made from polyvinylidene fluoride (PVDF). The study investigates the relationships between vibration frequency, initial distance, and electrical output. Findings indicate that higher setup parameters may lead to increased electrical output, but the relationship is not linear. Notably, the resonance between the vibration frequency and the device's natural frequency emerges as a critical factor in optimizing electrical performance. Detailed experimentation, visualized through figures and graphs, demonstrates the nuanced interplay of setup parameters and electrical output. The study emphasizes that the initial distance, while important, does not singularly determine the device's electrical performance. It challenges conventional beliefs by showcasing that piezoelectric devices can operate efficiently in tight spaces. Furthermore, the study delves into the non-linear relationship between vibration frequency and electrical output. Examining natural and resonant frequencies reveals that resonance occurs most prominently at the device's natural frequency, emphasizing the importance of precise tuning for optimal performance. The findings offer valuable insights for the strategic deployment of piezoelectric technology in ocean energy harvesting, paving the way for more efficient and effective devices in real-world condition

Effectiveness of Adding Different Types of Vitamin C in Improving the Quality of Artemia salina sp.

Artemia is a natural food that contains pigments (canthaxanthin), protein, vitamin C and some essential fatty acids for the growth of fish and shrimp. Artemia contains vitamin C, but it is still suspected that additional vitamin C is needed for larval development, gonad maturity and gamete quality. The purpose of this study was to analyze the effectiveness of vitamin C (ascorbic acid) absorption in the enrichment of Artemia sp. The stocking density of Artemia cysts was 2 g per 2 liters of water with a dose of Vitamin C of 100 mg/liter. The hatching process produced Hatching Percentage (HP) of 54.22% and 53.69%. The method used was laboratory experiment, analyzing Vitamin C absorption using UV-Vis Spectrophotometry method at 450-750 nm wavelength followed by BNT test. UV-Vis spectrophotometer method to determine the level of vitamin C absorbed during the artemia immersion process. Vitamin C absorption concentration after soaking process for 6 hours obtained an average of 0.8640 ppm and 0.8642 ppm. The results of the BNT test showed results with a value of 0.05, so the second type of Vitamin C applied to Artemia was not significantly different

Numerical Study of Reducer Modification with Adjuster Opening Variations on Turbine Lube Oil Pipe

The success criteria of the power plant are represented by EAF (Equivalent Availability Factor) value. In 2021, one of the causes of the Forced Outage (FO) at Adipala Steam Power Plant was the failure of the main lube oil turbine pipe. The sudden contraction of the reducer resulted in the previous failure. Modifications were made to the reducer using a conical shape to reduce the number of welding processes and minimize the probability of failure. Therefore, a study on reducer modification needs to be carried out to study the impact of changing the shape of the reducer and changing the opening check valve on process parameters and flow in the main lube oil turbine pipe. The modification of the reducer was the main focus in this study. This research aims to analyze the pressure of turbine lube oil in the existing adjuster and the modified adjuster, using the Computational Fluid Dynamics technique with check valve adjuster variations (distance between the tip of the check valve and the inner wall of the reducer). The inlet boundary condition was defined by a pressure inlet of 285803.4 Pa. Outlet boundary condition was set by a mass flow of 65.72 kg/s. The curve surface was set as wall boundary conditions with a stationary wall, no-slip, and standard roughness model. The oil pressure in the modified adjuster increased compared to the oil pressure in the existing adjuster. The pressure on the oil flow was required to distribute oil to the turbine bearings. With the small increase in pressure after the modification, the turbine lube oil transfer improved. The pressure drop (ΔP) value that occurred in the conical-shaped modified adjuster was smaller than the pressure drop (ΔP) in the existing adjuster. This is because the resistance on the modified adjuster was less than the existing adjuster. The flow streamlines that formed backflow and vortex on the conical modified adjuster were less compared to the existing adjuster due to fewer obstacles in the conical modified adjuster