Optimasi Biaya dan Waktu Jalur Angkutan Kota (Angkot) Malang dengan Metode Ant Colony Berbasis Perangkat Android

Kota Malang memiliki beberapa sebutan seperti Kota Pendidikan dan Kota Wisata. Disebut sebagai Kota wisata karena  terdapat  peninggalan-peninggalan  bersejarah  yang  masih  terjaga  sehingga  banyak  wisatawan dalam maupun Luar Negeri dan disebut sebagai Kota Pendidikan karena terdapat banyak perguruan tinggi aktif di Kota Malang  dan  beberapa  diantaranya  menduduki  peringkat  terbaik  di  Indonesia.  Tidak  sedikit  wisatawan  dan mahasiswa  baru  ingin  berkeliling  Kota  Malang,  bagi  mereka  yang  baru  pertama  kali  berkunjung  ke  Malang membutuhkan  informasi  tentang  angkutan-angkutan  apa  saja  yang  harus  dinaiki  serta  jalur mana yang akan dilewati. Pada penelitian ini dikembangkan sebuah aplikasi dengan menggunakan metode ant colony atau koloni semut,  yaitu  sebuah  metode  yang  meniru  perilaku  semut  dalam  mencari  sumber  makanan dan kembali ke sarangnya dengan secara alami mampu menemukan rute terpendek. Semut yang melewati rute terpendek akan meninggalkan aroma pheromone yang lebih tajam dan aroma tersebut akan diikuti oleh semut-semut yang lain menuju  makanan.Hasil  dari  penelitian  ini  adalah  metode  ant  colony  dapat  diterapkan  dalam  aplikasi  ini  yaitu untuk  mencari  rute  angkutan  kota  Malang  dengan  perhitungan  pada  waktu  tempuh  dan  biaya  yang  harus dikeluarkan  oleh  penumpang.  Hasil  pendapat  responden  menunjukkan  80%  menyatakan  bermanfaat  dan  80% menyatakan mudah digunakan

Variasi Komunitas Plankton dan Parameter Oseanografi di Daerah Penangkapan Ikan Pelagis di Perairan Malang Selatan, Jawa Timur

The South Malang water is a potential area as a fishing ground. The existence of various species of small pelagic fishes such as planktivores fishes are directly influenced by the growth of phytoplankton and zooplankton. Phytoplankton has an important role as the basis of the food chain in aquatic ecosystems, whereas zooplankton is its predator. The growth of phytoplankton and zooplankton is influenced by oceanography factors. This study aims to determine the variation of the plankton community and its relationship with oceanographic parameters, as well as the spatial distribution of plankton in the fishing ground at South Malang water. The purposive sampling method with zigzag technique at 10 sampling sites was used in data collection in this research. Sedwicgk rafter counting cells were used in plankton counting methods. The plankton samples were taken horizontally and vertically at depths of 1 and 15 m with a 20 μm planktonnet, while in situ oceanographic parameters were measured using aqua quality sensor AAQ type 1183 C. The results showed that phytoplankton abundance was 49.764 cells / m3, dominated by the genus Chaetoceros (Bacillariophyceae), and zooplankton abundance of 894 ind / m3, dominated by the genus Nauplius (Copepoda). The diversity index and uniformity index of phytoplankton and zooplankton could be categorized as the middle as 1.77-1.85 and 1.70-1.77; 0.58-0.59 and 0.77-0.79, respectively, while the dominance index was included in the low category that was 0.27-0.28 and 0.24-0,27, respectively. Principal Component Analysis (PCA) analysis showed that the most important major oceanographic parameters for plankton community variation were turbidity, chlorophyll-a, dissolved oxygen and phosphate. T test results show that the spatial distribution of phytoplankton abundance and zooplankton at depth of 1 m and 15 m are significantly different. This study provides important information on the plankton abundance and oceanography factors affected at fishing ground of South Malang water

Radioaktivitas Iodium-125 Pada Uji Produksi Menggunakan Target Xenon-124 Diperkaya

Telah dilakukan uji produksi 125I menggunakan target xenondiperkaya dengan pengayaan 124Xe sebesar 82,4%. Target diiradiasi neutron di kamar iradiasidi posisi S1 pada reaktor G.A. Siwabessy. Setelah iradiasi selama 24 jam, gas xenon teriradiasidiluruhkan di dalam botol peluruhan selama 7 hari. Radioisotop 125I yang terbentuk di dalambotol peluruhan dilarutkan menggunakan NaOH 0,005N sebanyak 3 kali. Dari uji produksi ke-1sampai dengan ke-8 diperoleh radioaktivitas total 125I sebesar 9541, 9801, 11239, 9458, 3293,3735, 4693 dan 2744 mCi. Penurunan radioaktivitas total 125I disebabkan oleh penurunanjumlah gas target. Radioaktivitas 125I hasil pelarutan pertama bergantung pada volume larutanNaOH yang digunakan. Persentase rerata radioaktivitas 125I pada pelarutan pertama sebesar65,1%, 71,5% dan 82,6% dari radioaktivitas total untuk pelarutan menggunakan larutan NaOHdengan volume 3, 4 dan 5 mL. Konsentrasi radioaktivitas maksimum yang berhasil diproduksisebesar 3410 mCi/mL dari hasil pelarutan pertama dari uji produksi pertama

Foreshock–mainshock–aftershock sequence analysis of the 14 January 2021 (Mw 6.2) Mamuju–Majene (West Sulawesi, Indonesia) earthquake

AbstractWe present here an analysis of the destructive Mw 6.2 earthquake sequence that took place on 14 January 2021 in Mamuju–Majene, West Sulawesi, Indonesia. Our relocated foreshocks, mainshock, and aftershocks and their focal mechanisms show that they occurred on two different fault planes, in which the foreshock perturbed the stress state of a nearby fault segment, causing the fault plane to subsequently rupture. The mainshock had relatively few aftershocks, an observation that is likely related to the kinematics of the fault rupture, which is relatively small in size and of short duration, thus indicating a high stress-drop earthquake rupture. The Coulomb stress change shows that areas to the northwest and southeast of the mainshock have increased stress, consistent with the observation that most aftershocks are in the northwest.</jats:p

Ekstrak Metanolik Biji Duwet (Syzygum Cumini L. (Skeels) untuk Penghambatan Kerusakan Oksidatif pada Emulsi Minyak Wijen [Methanolic Extract Of Java Plum (Syzygium Cumini L. (Skeels) Seed To Inhibit Oxidative Damages In Sesame Seed Oil Emulsion]

Methanolic extract of Java Plum (Syzygium cumini) seed (MEJS) have strong antioxidant activity by radical scavenging antioxidant-2,2 diphenyl-1-picrylhydrazyl (RSA-DPPH) assay, ferric ion reducing antioxidant power (FRAP), also strong in the inhibition of lipid oxidation in the linoleic acid emulsion system assay, but moderate on striped catfish (Pangasius hypothalamus) oil-in-water emulsions. Antioxidant activity of MEJS is relatively stable on thermal heating by oven until 130 oC/10 minutes, gamma ray's irradiation up to 12.5 KGy and suitable application on pH 6-9 acidity. MEJS is potential as a natural antioxidant in food system. However, must be carried out further assay the effectiveness of its use in commercial edible oil. The purpose of this research was to analyzed the effect of the addition of MEJS 200-1000 ppm against inhibition of lipid oxidation in an emulsion system. Research methods consisted of sesame seed oil extraction and analyzes of its a fatty acid profile, MEJS applied on sesame seed oil emulsion system to inhibit of lipid oxidation during 3 weeks storage. Assay variables were RSA-DPPH, the peroxide value (PoV), TBARs value and the free fatty acids (FFA) values changes. The result showed that 35.85% Sesame seed oil yield consisted of 11.62% saturated fatty acids, 6.23 % mono unsaturated fatty acids and 85.95% poly unsaturated fatty acids. Applied of MEJS (200-1000 ppm) could increase of DPPH• radical scavenging stronger than both BHT 200 ppm and the control (sesame seed oil bulky), but didn't correlative impact with inhibition autoxidation on it. Applied MEJS &gt; 800 ppm comparable with BHT 200 ppm. MEJS as a natural antioxidant is not appropriate to apply for the oil in water of emulsion system