Development of lightweight core sandwich based bioresin for ship structure application needs more attention. Bioresin from vegetable oils constitutes single, easily available, low cost, and biodegradable materials. In this research, the vinyl ester bioresin based Vinyl Ester-Coconut Oil (VE-CO) and Vinyl Esters-Soybean Oil (VE-SbO) containing 4 wt% vegetable oils are developed. The influence of vegetable oil addition in bioresin is characterized by visual observation and physical testing, including FTIR, density, hardness, and tensile test based on Lloyds Register standard. Visual testing shows that VE without vegetable oil is more transparent compared with VE with vegetable oil. The density test shows that adding vegetable oil decrease the apparent density. Vibration pattern indicates the presence of O-H, C-H, C=O, C=C, and C-O-C, which demonstrate the ability to bind, which leads to the potential formation of a polymer blend and elongation increase. Moreover, hardness decreases due to the absence of chemical bonds that occur between vinyl esters and vegetable oils. The addition of vegetable oil to vinyl ester bioresin reduces tensile strength and increases the elongation at break. So, density and tensile strength criteria meet Lloyd’s Register Standard while the other criteria are not fulfilled.
Abstract.This research studied the inhibition of corrosion by bawang dayak leaves extract (EleutherineamericanaMerr.) on API 5L steel in brine water environment (3.5% NaCl). The inhibitor was extracted using maceration process from bawang dayak leaves that was cultivated in Paser District, East Kalimantan. The test of antioxidant activity showed that bawang dayak leaves extract is a very powerful antioxidant with IC 50 value of 27.30204. The results from FTIR test show the presence of electronegative atoms and double bonds of the alkenes groups that provide the potential of the extract as a corrosion inhibitor. Efficiency of inhibition reached up to 93.158% for the addition of inhibitor with 300 ppm concentration and 20 days of immersion time. This inhibitory behavior is also supported by polarization measurements where the lowest corrosion rate of 0.00128 mm/year is obtained at the same concentration and immersion time.
Vegetable oil is biodegradable, non-toxic, environmentally friendly, and renewable so that it becomes an alternative to replace mineral oil and chemicals. This research will develop a bioresin which is a mixture of epoxy with natural polymer such as palm oil. The homogenization method uses a hot plate so that the mixing reaches miscible materials. The results of bioresin testing with variations in the composition of palm oil showed that the optimal composition variation was E-MS (10%) because it had a low tensile strength value of 53.111Mpa. While the highest elongation value is 14.04767%, and has a low hardness value of 86.3 on the shore D scale. The highest density value is 1.25254(g/cm3). Judging from the standard L'loyd Register and BKI (Indonesian Classification Agency) that the values of all tensile strength test results meet the standards and all variations in the composition of the test results and elongation values meet the minimum criteria.
Lube oil cooler serves to lower the temperature of the lub eoil in the gas turbine lubrication system. The problem that often occurs is the oil exit temperature is still high. This causes process failure in the lubrication system because the working temperature exceeds the allowable temperature. This failure is caused by non-uniformity flow distribution of the lube oil cooler. Therefore, further studies are needed to improve the uniformity of flow distribution. To increase the uniformity of flow, modification of the shape of the inlet header and variations of the lubricating oil capacity on the performance of the lubricating oil cooler were carried out. The research method used is numerical simulation with ANSYS FLUENT software. The simulation is carried out in 3 dimensions with a turbulence model in the form of k-ε RNG using a pressure based solution solver. Making geometry and design specifications using GAMBIT software. Geometric data is the dimensions of the lubricating oil cooling system and data from previous studies. The simulation is carried out in the form of a base line header with a modification of the inlet header, namely a multi-step blocker with variations of the Reynolds Number of 3088, 5146, and 7616. Based on the results of numerical simulations that have been carried out, the lowest Non-uniformity flow rate is at Re = 3088 sebesar, Ф = 0.01594, Exit Temperature 76.620 oC, and Pressure Drop 639.265 N/m2.
ABSTRAKKabupaten Banyuwangi merupakan kabupaten terluas di Provinsi Jawa Timur yang terletak di ujung Pulau Jawa. Sektor perikanan memiliki potensi untuk terus dikembangkan dalam rangka mewujudkan ketahanan pangan dan sebagai sumber protein yang sangat dibutuhkan oleh manusia. Kelompok Budidaya Ikan Susukan Lestari di bawah binaan Desa Tambong, telah berhasil melahirkan suatu terobosan untuk memberikan nilai tambah bagi desa dengan menghadirkan lokasi wisata edukasi yang bergerak dibidang perikanan dan pertanian. Namun, kualitas air yang digunakan masih sangat rendah, khususnya tingkat kekeruhan yang menjadi permasalahan dalam perkembangan usaha ini. Pada kegiatan ini dilakukan pendampingan untuk penerapan water treatment atau pengolahan air sebelum dialirkan ke kolam budidaya. Kegiatan ini dilaksanakan di Lokasi Wisata Edukasi Perikanan dan Pertanian Desa Tambong, Kecamatan Kabat, Kabupaten Banyuwangi. Alat yang digunakan berupa mesin pompa untuk memompa air dari sungai menuju wadah filter. Wadah Filter yang digunakan tiga buah dengan kapasitas 350 liter. Selanjunya bahan filter yang digunakan adalah batu zeolite, ijuk, pasir silika, dakron, japmat (penyaring mekanis), arang aktif dan kaporit. Hasil pengukuran menunjukkan bahwa perlakuan filter memberikan pengaruh terhadap perubahan kadar nitrat, pH dan total plankton. Sedangkan perubahan kekeruhan dapat diamati langsung secara fisik dan memberikan pengaruh yang sangat berbeda. Kata kunci: desa Tambong; wisata edukasi; pengelolaan air; kekeruhan ABSTRACTBanyuwangi Regency is the largest district in East Java Province which is located at the tip of Java Island. The fisheries sector has the potential to continue to be developed to realize food security and as a source of protein that is needed by humans. The Susukan Lestari Fish Cultivation Group under the guidance of Tambong Village has succeeded in creating a breakthrough to provide added value to the village by presenting educational tourism sites engaged in fisheries and agriculture. However, the quality of the water used is still very low, especially the level of turbidity which is a problem in the development of this business. This activity is carried out by assisting with the application of water treatment or water treatment before it is channeled into the cultivation pond. This activity was carried out at the Tambong Village Fisheries and Agriculture Educational Tourism Site, Kabat District, Banyuwangi Regency. The tool used is a pumping machine to pump water from the river to the filter container. Filter containers used 3 (three) pieces with a capacity of 350 liters. Furthermore, the filter materials used are zeolite stone, palm fiber, silica sand, darkon, japmat, activated charcoal, and chlorine. The measurement results showed that the filter treatment affected changes in nitrate levels, pH, and total plankton. Meanwhile, changes in turbidity can be observed directly physically and have very different effects. Keywords: tambong village; educational tourism; water treatment; turbidity.
Olivine single phase of LiFePO4 was successfully synthesized by solid-state reaction (SSR) method through the formation of Fe2P2O7 from precursors of Li2CO3, F2O3, NH4H2PO4, and LiF as materials doping. Variations at temperatures of calcination 670 0C, 700 0C and 750 0C with doped 0.1F. TGA-DSC test results show that the LFP sample undergoes decomposition in the temperature range 0-600 0C. The olivine phase formed at temperatures of more than 650 0C and the oxidation process on the LiFePO4/C sample was completed, and the sample mass was constant. The olivine phase formed was determined by comparing the 2𝜃 value obtained through characterization with the ICDD LFP (01-081-1173), and accordingly with experiment. The increase of the temperature results from a dominant LFP phase with a larger grain size. The effect of increasing the calcination temperature at 0.1F has resulted in an enlargement of the particle size.
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