Abstract Keteguhan Village is an area that has the highly potential to flood disaster, such as the flash flood incident that occurred on March 30, 2020. Floodprone mapping is needed to map flood prone potentials in SKeteguhan Village with the aim of increasing the alertness and readiness of the Keteguhan Village’s community in dealing that disaster. The used method includes processing the parameters of rainfall, land cover, slope, soil type, land height and land cover, then carried out by a weighted overlay process to form new data in the form of a flood prone potential map. The obtained results are that there are 3 potential areas, namely the lowlands along the river area of Umbul Kunci Street, the river area in the nearest neighborhood of Keteguhan Village and Mushollah Nurul Jannah on Laksamana R.E. Martadinata Street. Based on the area of vulnerability level in Keteguhan Village, the safe category has an area of up to 137,451 Ha with a percentage of 44.6%, the non-prone category has an area of up to 95,5116 Ha with a percentage of 30.01%, the vulnerable category has an area of up to 62.4922 Ha with a percentage of 20.27% and the very vulnerable category has area up to 15.7767 Ha with a percentage of 5.12%.
Rebound Hammer Test result of old repaired masonry wall using premixed mortar additive in tidal flooding prone area AIP Conference Proceedings 1977, 040012 (2018 Abstract. The damage of bone tissue may cause malfunction of human load-bearing system. To date, hydroxyapatite (HA) is one of the most potential materials to repair bone damages and to restore the load-bearing function. It has been produced from both synthetic chemical and natural resources, including limestone. In this paper, the properties of hydroxyapatite made of CaCO 3 from limestone was investigated in a function of sintering time, i.e., 2, 3 and 4 hours, and temperature, i.e., 600, 800 and 1000 C. The preparation of HA included crushing, meshing, grinding and sintering. HA powder was then characterized using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscopy (EDS). The hardness of compacted hydroxyapatite powder was also characterized using microVickers testing machine. SEM micrograph shows the agglomeration of particle increase in line with sintering temperature. The highest hardness was obtained for hydroxiapatite sample sintered at the highest temperature and for the longest time, while EDS result indicates the highest ratio of calcium and phosphor was 2.33. The percentage of calcium in the observed local HA decreased as the sintering time increased. A comparison of XRD result between the commercially imported and the local HA powder produced in this study shows a similarity pattern, which indicates the potential replacement of the imported HA by our local limestone resources.
Pondok Pesantren Darussalam, Natar di Kabupaten Lampung Selatan merupakan salah satu sentra penghasil jamur tiram putih. Sentra jamur di pondok pesantren tersebut bertujuan untuk menjadi salah satu sumber pemasukan guru Yayasan dan juga dapat menjadisarana belajar langsung bagi para siswa. Kegiatan Pengabdian kepada Masyarakat ini bertujuan untuk memberikan sosialisasi dan bimbingan teknis untuk peningkatan nilai tambah hasil budi daya jamur tiram putih yang berfokus pada implementasi mesin pengering spinner untuk hasil panen jamur. Selalin itu juga bertujuan untuk menjelakan berbagai teknik penyimpanan dan pengawetan hasil panen jamur tiram agar dapat memiliki umur yang lebih panjang. Teknologi pendukung produk paska panen jamur yang diimplementasikan adalah berupa alat pengering spinner (alat pengering putar). Berdasarkan hasil kuesioner dan bimbinban teknis yang telah dilaksanakan, secara umum peningkatan dalam aspek pemahaman peserta berkenaan teknik pengawetan jamur paska panen dan juga pemahaman dan kemampuan peserta dalam pengoperasian ipteks mesin pengering spinner bagi jamur tiram putih sebesar lebih dari 2 (dua) kali lipat atau 200%, dimana darirerata nilai pre-test 35,72 menjadi 87,30.
Welding is a method of joining metals by utilizing local heat to form a metallurgical bond between the metals. The most common welding is electric welding, including the Shielded Metal Arch Welding (SMAW). This type of welding uses a filler wire or electrode. To reduce weld cracks and cooling rates in the weld metal and heat affected zone (HAZ) area, it is necessary to carry out a pre-heating process. Pre-heating is the application of heat to the material to be welded using oxyacetylene welding or a gas torch. This study aims to determine the appropriate pre-heating distance for the welding process of AISI 1045 steel, classified as a type of medium carbon steel widely used in shafts, gears, and piston connecting rods in motor vehicles. The parameters used in this study were the pre-heating distances of 1.5cm, 3cm, and 4.5cm that were preheated at a temperature of 150°C, using LB-52U type electrodes with a diameter of 2mm.
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