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Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Papua Jalan Gunung Salju Amban, Manokwari 98314
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Jurnal Natural
Published by Universitas Papua
ISSN : 14121328     EISSN : 2746427X     DOI : -
Core Subject : Science, Education, Agriculture,
Agriculture, Biological Sciences & Forestry Chemistry Mathematics Physics
Jurnal Natural merupakan jurnal ilmu-ilmu matematika dan pengetahuan alam (basic science) untuk bidang: matematika, kimia, statistika, biologi, dan fisika termasuk ilmu terapan yang terkait seperti bioteknologi, kimia pangan, keanekaragaman hayati, dan lain-lain.
Arjuna Subject : Umum - Umum
Articles 160 Documents
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CATION EXCHANGES IN CLAY LOAM FROM BOGOR, WEST JAVA Ishak S. Erari
Jurnal Natural Vol. 6 No. 2 (2007): Jurnal Natural
Publisher : FMIPA Universitas Papua

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Abstract

Kapasitas tukar kation dan koefisien selektivitas merupakan parameter penting yang mempengaruhi distribusi kation antara fase larutan dan fase padatan, dan mobilitasnya di dalam tanah. Studi tentang pertukaran kation melalui koefisien selektivitas pada tanah clay loam Bogor, Jawa barat yang ditanami sawi (Brassica juncea) telah dilakukan. Kation-kation utama yang dipelajari adalah Ca, Mg, K dan Na. Kompleks adsorpsi di dalam tanah tersebut didominasi oleh Ca dan Mg. K dan Na sangat sedikit diadsorpsi. Koefisien selektivitas antara ion adalah KCa,Mg, KK,Ca, KNa,Ca, KK,Mg, KNa,Mg dan KNa,K adalah 0.67, 0.57, 0.37, 0.25, 0.32, dan 1.36. Koefisien selektivitas yang diperoleh didalam studi berada pada kisaran dari hasil studi lainnya. Didalam studi ini akan ditunjukkan penggunaan koefisien selektivitas untuk persiapan digunakan di dalam persamaan-persamaan transport kation.
EKSTRAK TANNIN DAUN BUAH HITAM (Haplolobus sp) SEBAGAI INHIBITOR ALAMI KOROSI BESI DALAM LARUTAN ASAM Lulu Amalia Rahman; Evelina Somar
Jurnal Natural Vol. 16 No. 1 (2020): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v16i1.78

Abstract

Ekstrak daun Haplolobus sp diperoleh dari sokhetasi daun yang telah dikeringkan dan diperkecil ukurannya, dengan pelarut aseton 80%. Ekstrak yang diperoleh kemudian diuapkan dan ditentukan kadar taninnya dengan metode permanganometri. Pengukuran laju korosi logam besi dilakukan dengan metode pengurangan massa. Medium korosi yang digunakan adalah , , , dan HCl masing-masing dengan konsenttrasi 1 molar. Lama perendaman sepuluh hari. Potensi tanin daun buah hitam sebagai inhibitor alami dalam laju reaksi korosi logam besi dilakukan dengan melapisi logam besi ukuran 2 cm x 2 cm x 0,3 cm , direndam 10 hari dalam medium korosi dan diukur laju korosinya. Cara yang sama diulangi dengan menggunakan cat antikarat. Dari hasil penelitian di peroleh kadar tanin dalam daun Buah Hitam (Haplolobus sp) sebesar 42,16%. Laju korosi logam besi tanpa pelapisan tanin tertinggi pada asam nitrat 13829.40 mpy dan terendah pada asam asetat 1646,36 mpy. Laju korosi logam besi yang dilapisi tanin tertinggi pada asam nitrat 13061.10 mpy, dan terendah pada asam asetat 1536,60 mpy. Laju korosi logam besi yang dilapisi cat antikorosi tertinggi pada asam nitrat 7573,24 mpy dan terendah pada asam asetat 1536,60 mpy. Efisiensi penghambatan tanin dan cat terhadap laju korosi logam besi dalam medium asam sulfat 1 M sebesar 25,64 % dan 41,03%, dalam medium asam fosfat sebesar 12,50% dan 16,67%, dalam medium asam asetat sebesar 6,67 dan 6,67%, Dalam medium asam nitrat sebesar 5,56 dan 45,24%, dalam medium asam klorida 5,56 dan 5,56%.
PERANAN GELOMBANG PANJANG TERHADAP SIRKULASI ARUS GLOBAL Fendry Yandi Samuel Mamengko
Jurnal Natural Vol. 6 No. 2 (2007): Jurnal Natural
Publisher : FMIPA Universitas Papua

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Abstract

The global surface current system forms a large scala current circulation pattern known as gyra, which occurs in the Pasific, Hindia, and Atlantic oceans. At the nothern equator, the gyra circulation is counterclockwise, while it is anti counterclockwise at the southern equator. The trade wind crossing the Equatorial ocean causes a different slope and influences the slope form. The response of the sea level slope can be only described by the sea level pertubation concept that the disturbance moves as pulse wave which travel alongside equatorial ocean. The effects of the Rossby and Kelvin waves propagation on the ocean circulation depend on the lattitude. At the middle and high lattitudes, the Rossby wave experiences the change of the surface wind stress which has more influence in the ocean near western boundaries than that in the near eastern boundaries. At low lattitude, the Rossby and Kelvin waves propagations is located at the equatorial wave guide. Along the equatorial wave guide, the Kelvin wave propagates easterly. This wave is then split into 2 directions as the wave moves towards the eastern boundary. The first direction goes to the northern equator. The other moves towards the southern equator, which eventually becomes the coastal Kelvin wave. A part of the Kelvin wave is reflected to produce the equatorial Rossby wave. Because of the equator plays important roles as wave guides, the low lattitude ocean responds more to the variability of the wind flow than that at the high lattitude.
EVALUATION OF THE GROUNDWATER DISCHARGE FROM THE YARRAGADEE FORMATION INTO THE BLACKWOOD RIVER, BLACKWOOD PLATEAU, WESTERN AUSTRALIA USING WATER BALANCE ANALYSIS Baina Afkril
Jurnal Natural Vol. 6 No. 2 (2007): Jurnal Natural
Publisher : FMIPA Universitas Papua

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Abstract

Area studi terletak di bagian tenggara Dataran Tinggi Blackwood, Australia Barat mencakup 71 km2. Akifer Yarragadee di daerah studi utamanya tersusun oleh batu pasir yang mengandung lapisan-lapisan batu lempung dan liat. Akifer ini merupakan akifer tak-tertekan karena muncul dipermukaan sepanjang alur Sungai Blackwood pada daerah hilir di Nannup dan merupakan sumber airtanah yang keluar ke sungai. Sungai Blackwood mengalir melintasi Dataran Tinggi Blackwood. Selama musim kering, aliran permukaan ke dalam Sungai Blackwood dapat diabaikan, namun aliran dasar dari airtanah menjadi sumber utama bagi aliran sungai. Neraca air pada daerah studi dilakukan dengan menggunakan analisa jaring-aliran dan kesetimbangan air guna mengevaluasi masukan airtanah dari akifer Yarragadee ke dalam Sungai Blackwood. Mayoritas sel-sel jaring-aliran adalah sel-sel keluaran dan kebanyakan aliran airtanah masuk ke dalam Sungai Blackwood di daerah studi. Curah hujan rata-rata tahunan area studi sekitar 6.7 x 107 m3 a-1. Sekitar 9 % dari total curah hujan rata-rata tahunan ini masuk ke dalam tanah sebagai sumber bagi air tanah dan 91 % hilang melalui proses evapotranspirasi. Volume total airtanah yang masuk ke dalam Sungai Blackwood antara stasiun Darradup dan Layman Flat yang dihitung menggunakan analisis jarring-aliran dan kesetimbangan air sekitar 8.1 GL a-1.
PERTUMBUHAN LINGKARAN POHON JATI PADA DUA SISTEM KULTUR BERBEDA DI JAWA TIMUR Iriwi Louisa S. Sinon
Jurnal Natural Vol. 6 No. 2 (2007): Jurnal Natural
Publisher : FMIPA Universitas Papua

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Abstract

Study dendrochronology or tree-ring dating is defined as the study of chronological sequence of annual growth rings in trees. Teak (Tectona grandis) is one of various tree species that has been identified for the use of tree-ring studies in tropical regions. Teak is found to be suitable for dendrochronology as it is long-lived and develops defined annual growth rings. In Java, teak cans growth naturally or intensively in plantation. The two silviculture conditions will give different sensitivity on climate effect. Therefore, the effect of silviculturer will on natural teak and plantation teak in Saradan, Madiun, and East Java. As a part of the study, ten core samples from natural- growth teak were measured. The samples of growth rings is spanned from 1832 – 2004. Using the COFECHA program, the correlation of the samples (r) was found to be 0.44 point, which is satisfactory to the standard used in dendrochronology. Thus, from this study it can be concluded that natural teak could still be used in dendrochronology, although the sensitivity are not as high as plantation teak.
KAJIAN POTENSI ENERGI ANGIN KABUPATEN KAIMANA PROVINSI PAPUA BARAT Elias K. Bawan
Jurnal Natural Vol. 6 No. 2 (2007): Jurnal Natural
Publisher : FMIPA Universitas Papua

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Abstract

The human needs for electrics energy, especially in Kaimana regency is increasing together with city development and increasing of the resident. The electric energy supply from diesel power plant in PT. PLN (Persero) is very limited, electrical distinguishing and electrical black out are frequently happened. The potential of renewable energy like wind power is very potential to be developed as electrical energy source. Result of the study shows that the average of wind speed is 4.68 metres/second and it can be classified in third class energy. The potential of wind power in Kaimana regency is 267.7 Watt for diameter 2m and 415.60 Watt for diameter 3m.
GEOMETRI JALAN ANGKUT TAMBANG PADA KP PT. INDONESIA TIMUR RAYA NABIRE – PAPUA Jance M. Supit
Jurnal Natural Vol. 6 No. 2 (2007): Jurnal Natural
Publisher : FMIPA Universitas Papua

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Abstract

Haul road is an important infrastructure that functions as places connector in mining area. In as much, it is necessary to make haul road geometry plan that suitable to the equipments and mining location. The study of mining haul road conducted in 200 Ha of PT. Indonesia Timur Raya mining area. The study methods are by observation on road site and calculation to decide the haul road geometry, including road wide and slope. The equipment that will be used is wheel loader XCMG ZL50G, from the calculation base on the wheel loader specifications, the minimum haul road wide is 10.5 meters for straight road and 28 meter in curve road.
MISTERI BURUNG BERACUN (Pitohui dicrous) DARI PEGUNUNGAN ARFAK, MANOKWARI. Amon A. Rumbino; Amson D. Flassy; Hans S. Ihalauw
Jurnal Natural Vol. 6 No. 1 (2007): Jurnal Natural
Publisher : FMIPA Universitas Papua

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Abstract

An observation was carried out to reveal the mystery of the poison bird Pitohui dichrous from the Arfak Mountains. According to the Arfak tribe, the poison came from plants (Amorphalus galbra and Alocasia flabellifera) and not from the beetle such as in PNG. Therefore, a furthur study was needed to reveal the poison of Pitohui dicrous from the Arfak mountains
ANCAMAN DAN KEPUNAHAN BURUNG MAMBRUK POLOS Goura cristata DI BAGIAN TIMUR KEPALA BURUNG (VOGELKOP) IRIAN JAYA BARAT Agustinus Kilmaskossu
Jurnal Natural Vol. 6 No. 1 (2007): Jurnal Natural
Publisher : FMIPA Universitas Papua

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Abstract

The three species of “mambruk” (crowned pidgeons) are endemic to New Guinea (Irian Jaya and the Papua Nugini). The species are listed in CITES as vulnerable. In Indonesia the species are protected by law, but in the field they are still being hunted. There fore, the threat and extinction of the species was observed on five location in the Birds Head Region of Papua. The observation indicated thet there was only are location was the estuary of Warmiseru and Suandei Lagoon where the spesies were relativety observed.
KOMPOSISI JENIS DAN KELIMPAHAN IKAN DI PERAIRAN TELUK DORERI, MANOKWARI Maria Massora
Jurnal Natural Vol. 6 No. 1 (2007): Jurnal Natural
Publisher : FMIPA Universitas Papua

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Abstract

A study was done to search the composition and abundance of fish species in the waters of the Doreri Gulf the District of Manokwari, from September - October 2005. The fish catchments wash about 143 specimens consist of 49 species included in 23 families. The species of fish with a high abundance index consists of Nemipterus celebicus, Upeneus sundaicus, and Upeneus sulphureus. Those fishes have a high economic value in the market of Manokwari.

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