Natural Science: Journal of Science and Technology 2020-09-19T06:46:26+00:00 F Fahri Open Journal Systems <p><strong>Natural Sciences: Jurnal of Science and Technology</strong> [eISSN : 2541-1969 | pISSN : 2338-0950] is an open access journal from Tadulako University, Indonesia. Any paper reporting scientifically accurate and valuable research, which adheres to accepted ethical publishing standards, will be considered for publication. Natural Sciences: Journal of Science and Technology accepts papers in the fields of Mathematics, Statistics, Physics, Biology, Chemistry and Pharmacy. Our growing team of dedicated section editors, handle your paper and manage the publication process end-to-end, giving your research the editorial support it deserves.</p> <p><strong>Natural Sciences: Journal of Science and Technology</strong> <span class="fontstyle0">officially published three times a year. But, starting on January 1, 2021 Journal of Science and Technology will be published twice a year</span> <br style="font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"><br></p> Diversity of Hymenoptera Insect in Cowpea (Vigna sinensis L.) Agricultural Area at Martapura District, Banjar Regency, South Kalimantan 2020-09-19T06:46:26+00:00 Manap Trianto Fajri Marisa <p>Hymenoptera is one Order of insect which helpful for plant pollination, produces honey and wax, also can eliminate pests, one of which is in cowpea plants. This study aims to determine the diversity of Hymenoptera insects in cowpea (<em>Vigna sinensis</em> L.) agricultural area at Martapura District, Banjar Regency, South Kalimantan. Hymenoptera insect collection is carried out in the villages of Bincau, Labuan Tabu and Indra Sari with two kinds of methods, namely swep net during the day and light trap at night. The results showed that the cowpea agricultural area in Labuan Tabu village had the highest diversity value with a value of H '= 2.58, while the lowest value of H' was 2.28 in Indra Sari Village.</p> 2020-08-31T00:00:00+00:00 Copyright (c) 2020 Natural Science: Journal of Science and Technology Spline Regression Analysis to Modelling The Open Unemployment Rate in Sulawesi 2020-09-19T06:46:26+00:00 Selvia Anggun Wahyuni R Ratnawati I Indriyani Mohammad Fajri <p>Unemployment is a very complex problem because it affects and is influenced by several factors that interact with each other following a pattern that is not always easy to understand. If unemployment is not immediately addressed, it can cause social vulnerability and potentially lead to poverty. This research will use the spline regression method in modeling the 2018 Sulawesi open unemployment rate. The results obtained are the best spline model obtained from the optimum knots point with a combination of knots 3,3,1,1,3,3. This model has the minimum GCV value 1,97 with R<sup>2</sup> 77,67%. All variables significantly influence the open unemployment rate.</p> 2020-08-31T08:03:03+00:00 Copyright (c) 2020 Natural Science: Journal of Science and Technology Exploration of Terresterial Fern (Pteridophyta) in Mt. Rore Kautimbu Area Lore Lindu National Park 2020-09-19T06:46:26+00:00 Zainudin Zainudin Ramadanil Ramadanil <p>The study entitled "Exploration of Terrestrial Ferns in Mountain of Rore Katimbu, Lore Lindu National Park" has been carried out from March to September 2019. This study was aimed to describe the species of terrestrial ferns in Mountain of Rore Kautimbu, Lore Lindu National Park. The method was used botanical exploration methods. The results showed that there were 19 species consisted of 13 families of terrestrial ferns. Mostly, ferns were distributed in the tropics and subtropics area. Species that only distributed naturally in Sulawesi dan Maluku was <em>Alsophila celebica</em> (Blume) Mett.</p> 2020-08-31T07:58:17+00:00 Copyright (c) 2020 Natural Science: Journal of Science and Technology Formation and Characterization of mini-emulsion P3HT PCBM Nanoparticles 2020-09-19T06:46:26+00:00 Darmawati Darwis <p>This report presents the synthesis of nanoparticulate suspensions of P3HT:PCBM&nbsp; for organic photovoltaic active layer through&nbsp; a mini-emulsion process with the used of sodium dodecyl sulphate (SDS) as the surfactant. A series of characterization for the nanoparticles using Dynamic Light Scattering (DLS), Ultraviolet–visible spectroscopy, (UV-VIS), Photolumination (PL), Transmission, Electron Microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) also demonstrated. The&nbsp; P3HT/PCBM nanoparticle performances are comparable to P3HT/PCBM solution in chloroform and met the requirement for use in organic Photovoltaic fabrication</p> 2020-08-31T00:00:00+00:00 Copyright (c) 2020 Natural Science: Journal of Science and Technology The Invasive of Freshwater Prawn Macrobrachium lanchesteri (De Man, 1911) from Watershed in Palangkaraya University, Kalimantan, Indonesia 2020-09-19T06:46:26+00:00 Anita Maulina Angelina Inocencia Ebrry Dwi Putra Inriyati Satriani Linda Lusiana <p>Freshwater prawn species <em>Macrobrachium lanchesteri </em>(De Man, 1911) in Kalimantan for the first time was reported to be found only in East Kalimantan and there have been no reports of this species being found in Central Kalimantan. This study aims to reveal the presence of invasive freshwater prawn and habitat characteristics found in the watershed of Palangka Raya University. This study was conducted in October–November 2019 covering five stations. Specimens were collected using a purposive sampling method. Environmental parameter measurements were made including types of substrate, water velocity, tree cover, water depth as well as width. The identification of specimens from the watershed of Palangka Raya University based on morphological characteristics shown that the species very similar to the alien freshwater prawn, <em>M. lanchesteri.</em> Based on the results of research, this report has revealed the presence of this invasive species in Central Kalimantan, Indonesia.</p> 2020-08-31T16:12:24+00:00 Copyright (c) 2020 Natural Science: Journal of Science and Technology