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Design of Catamaran Electric-Powered Glass Bottom Boat as a Tourism Facility for Gili Noko Island
Get PDFGili Noko Island is one of the islands located in the Bawean archipelago, Gresik regency. The beauty of the beaches and underwater scenery on this island often captivates tourists but access to this island is quite limited. This research proposes the design of a tourist boat concept with a glass bottom route from Bawean to Gili Noko. In this research, there were several research design used those were the principal dimension, lines plan, general arrangement, construction calculation, stability analysis, ship motion analysis, and ship comfort. The selection of the engine is based on the calculated power required for the boat's resistance. The chosen engine is an electric propulsion system as a new environmentally friendly alternative. From the technical analysis, the boat's dimensions are found to be Loa: 11.83 m, B: 4.50 m, B1: 0.80 m, H: 1.50 m, T: 0.60 m, Cb: 0.611, and Vs: 7 knots. The engine power is 10.5 HP, and the battery capacity is 840 Ah. The construction calculation reveals that the boat weigths 4.8584 tons. The stability analysis complies with IMO standards, and the motion analysis and ship comfort meet the criteria set by Olson in 1987
Simulasi Numerik Penelusuran Aliran di Kanal Menggunakan Persamaan Saint-Venant
Get PDFPenelitian ini membahas perilaku debit di sepanjang kanal secara numerik menggunakan data debit yang tercatat di bagian hulu. Secara matematis perilaku debit di kanal dapat dilukiskan menggunakan persamaan Saint-Venant satu dimensi. Persamaan Saint-Venant merupakan sistem persamaan diferensial parsial non-linier dan secara umum belum ditemukan solusi analitiknya. Dalam penelitian ini model matematika tersebut disederhanakan dengan cara memodifikasi persamaan momentumnya. Persamaan Saint-Venant yang telah disederhanakan diselesaikan secara numerik menggunakan metode beda hingga eksplisit. Untuk memastikan bahwa model numerik yang dihasilkan dapat diimplementasikan, maka dilakukan uji validasi dengan model numerik yang dipilih dari literatur. Hasil simulasi menunjukkan bahwa input hidrograf dengan debit puncak 12 m3/detik mengalami peredaman debit sepanjang kanal. Pada lokasi x = 600 m dari hulu kanal, debit puncak menyusut menjadi 7,38 m3/detik
Pengembangan Desain Produk Keramik dengan Kombinasi Kayu Palet di Malang Jawa Timur
Get PDFProduk kerajinan keramik Dinoyo agar lebih variatif memerlukan sentuhan inovasi desain. Berdasarkan kondisi tersebut maka perlu dilakukan penelitian dan penggalian potensi industri kerajinan keramik Dinoyo untuk mempertahankan kelangsungan usahanya dan menghasilkan produk yang mengikuti perkembangan permintaan pasar. Salah satu strategi agar produk keramik Dinoyo memiliki keunikan adalah produk tersebut harus memiliki karakteristik, misalnya dengan mengkombinasikan (kombinasi) dengan material lain disekitarnya yang ramah lingkungan. Material yang akan dikembangkan dengan produk keramik Dinoyo pada penelitian ini adalah kayu pallet. Pemilihan kayu palet adalah kayu bekas dari kontainer sehingga pengembangan desain baru produk keramik di Dinoyo juga memperhatikan kelestarian alam. Metode penelitian yang digunakan adalah metode penelitian dan pengembangan. Penelitian ini akan melalui empat tahap pengembangan, yaitu 1) tahap pendefinisian, 2) tahap desain, 3) tahap pengembangan. Hasil penelitian pengembangan produk ini diharapkan dapat mendiversifikasi produk keramik Dinoyo sebagai kap lampu sebagai dekorasi interior. Mereka memiliki manfaat yang lebih komprehensif untuk keberlanjutan usaha kecil menengah dan lingkungan
Model Polinomial Sebagai Model untuk Melihat Hubungan Fungsional Antara Variable Respond dan Perlakuan
Get PDFThe use of waste as raw material for other products is a good thing to do, one of which is the use of fish skin waste which can be used as raw material for making gelatin which is one of the raw materials that is widely used for food products. In the process of making gelatin, it is affected by the concentration of malic acid when soaking the fish skin raw material and it is necessary to know what concentration of malic acid is right to obtain the desired quality. To see the effect of malic acid content on the acidity of the yield, analysis of variance was used and to see the functional relationship between the quality of the acidity of the marinade and the concentration of malic acid given, a polynomial model could be used. From the results of the analysis, it was found that there was an effect of the concentration of malic acid given on marinade, while the functional relationship obtained was a polynomial second-order model
Model Kolaboratif Penanggulangan Kemiskinan Ekstrem melalui Konsep Hexahelix di Provinsi Papua Barat Daya
Get PDFSouthwest Papua Province, part of Indonesia, faces significant developmental challenges, especially extreme poverty influenced by its adherence to customary law. With a poverty rate of 14.2 percent, this research employs problem-solving methods like qualitative and descriptive approaches. The study reveals a collaborative approach to combat extreme poverty in the region, involving various stakeholders and supported by additional contributors. This coalition includes regional authorities, academics, businesses, private individuals, media, communities, and traditional institutions. Further support comes from banks, NGOs, markets, local industries, and small-scale entrepreneurs. Each party has a distinct role: the government oversees, academics provide frameworks, businesses support, communities drive progress, media spreads information, and traditional institutions plan interventions. This multi-stakeholder strategy is crucial in addressing extreme poverty in Southwest Papua Province, harnessing diverse roles for sustainable change
Design of an Optical Rotation Value Measurement Tool Using an Arduino Device
Get PDFMalus' law asserts that the square of the cosine of the angle formed between two polarizers is directly proportional to the intensity of light after passing through them. In this study, we demonstrate this law using a straightforward configuration. Our method of measuring the polarizer's rotational angle while keeping the other polarizer stationary is innovative. It involves manually attaching a multi-turn potentiometer to one of the polarizers. The Arduino board is connected to the potentiometer and light sensor that is used to detect the intensity of transmitted light, allowing for the measurement of light intensity as a function of rotational angle. Additionally, we think that the configuration as it is now can be helpful in physics laboratory classes. It can also be demonstrated by using it during lecture
Anchor Analysis of the FPSO Spread Mooring System During Offloading
Get PDFFPSO (Floating Production Storage and Offloading) is a moving floating structure to accommodate petroleum exploration results with a frequently used mooring system, namely spread mooring. To make it easier for the FPSO ship to not be able to rotate or even move when loading and unloading due to environmental influences, a spread mooring mooring system is needed with analysis of the mooring stress and anchor lifting force that occurs on the FPSO ship. To determine the anchor lifting power and tension on the mooring, the RAO formula is needed using the Jonswap method, which will give RAO results in response to environmental influences. In this case, the Jonswap method is used to determine matters related to the RAO response to environmental factors by analyzing the FPSO ship model from Maxsurf software, then continuing the analysis using Ansys software. From the RAO response we get the mooring tension and anchor lifting power to the influence of environmental forces. The results of the mooring spread analysis obtained the highest stress value of 6.141 x 105 N, with an anchor lifting force of 4.717 x 103 N
Pembuatan dan Karakterisasi Briket Bio-Coal Berbahan Campuran Limbah Batubara dan Biomassa Rumput Melalui Proses Karbonisasi
Get PDFPenelitian ini bertujuan membuat Briket Bio-coal berbahan campuran limbah batubara dan biomassa rumput melalui proses karbonisasi beserta karakterisasinya. Briket Bio-coal dibuat dengan Limbah Batubara Sisa Preparasi (LBSP), Limbah Batubara Sisa Uji Proximate (LBSU), Sisa Pemotongan Rumput (SPR) yang dikarbonisasi, dan menggunakan perekat Tepung Tapioka (TT). Berdasarkan hasil analisa didapatkan semakin banyak komposisi limbah batubara maka akan menghasilkan nilai kalori yang tinggi. Kondisi optimum didapatkan pada sampel dengan komposisi 60LBSP:30SPR:10TT dengan nilai kalori 5311 cal/gr, kadar air 3,13%, kadar abu 16,78%, kadar volatil matter 42,53%, kadar fix karbon 37,55% dan nilai densitas 0,90 gr/cm3, serta 60LBSU:30SPR:10TT dengan nilai kalori 4844 cal/gr, kadar air 5,32%, kadar abu 19,05%, kadar volatil matter 36,78%, kadar fix karbon 38,85% dan nilai densitas 0,97 gr/cm3
Exploring the Impact of Trust, Perceived Utility, Ease of Use Perception, and Social Influence on E-Payment Adoption
Get PDFConsumer behavior shifts from cash to digital transactions due to innovations in payment system digitization, primarily through electronic payments like mobile banking and electronic wallets. In Indonesia, Shopee Pay emerged as a prominent non-bank QRIS provider in 2021, with the Quick Response Code Indonesia Standard (QRIS) mandated for all payment service providers. QRIS usage potential is high in East Java, particularly in Surabaya, where Generation Z constitutes the dominant user group for digital payments. To understand the factors influencing Generation Z's e-payment adoption, a study investigated the impact of payment mediums (Shopee Pay and mobile banking) on key variables: trust, perceived usefulness, perceived ease of use, social influence, intention to use, and actual usage of e-payment. Using Structural Equation Modeling (SEM) and Multi-Group Analysis (MGA) on 390 data points, the study revealed that trust, perceived usefulness, perceived ease of use, and social influence significantly influence intention to use, subsequently affecting actual e-payment usage. Furthermore, the study found that the effect of payment media on the relationship between trust and intention to use is notable only in mobile banking, whereas social influence's impact on intention to use is significant exclusively for Shopee Pay, as indicated by MGA results
Determining the Deposition Rate of Semiconducting Intrinsic Layer Prepared by Nanospray Method
Get PDFAmorphous carbon (a-C) film provides potential ability as an i-type layer in semiconductor material for photovoltaic purposes due to its tunable properties. Here, we investigate how to get the deposition rate estimation of the thickness and homogenous surface of a-C film as an i-type in solar cell applications. The a-C was prepared from palmyra liquid sugar using nebulizer as a nanospray method. The thick palmyra liquid sugar was carbonized at 250◦C for 2.5 hours then continued at 300◦C for 2 hours to obtain high-carbon charcoal. The thickness was examined using a SEM cross section, and the amorphous phase was measured using XRD. The amorphous characteristic of a-C is confirmed by broad peaks in XRD patterns. The thickness of a-C films was found to be thinner than in a previous study that used a similar materials and methods but different equipment in the deposition process. The average thickness of a-C films is in the range of 200 to 450 nm, followed by an increase in the deposition time of 5 to 25 s. By these value, the deposition rate estimation was obtained using extrapolation linier method from the SEM result around 11.62 nm/s. This result can be used as a reference to make various thicknesses for the i-layer in order to find the maximum thickness that gives high efficiency to amorphous carbon film