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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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PENERAPAN HUKUM KIRCHOFF PADA RANGKAIAN EKUIVALEN UNTUK MEMPEROLEH PERSAMAAN TELEGRAF Maria D. L. Rumlus; Tri Widjajanti; Rium Hilum
Jurnal Natural Vol. 16 No. 2 (2020): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v16i2.110

Abstract

Telegraph is a machine for sending and receiving messages remotely. Telegraph according to Zauderer can be modeled or expressed in mathematical language, namely the telegraph equation. Kirchoff I's Law deals with currents and Kirchoff II's Law is the basis for analyzing all electrical circuits. The purpose of this research is to apply Kirchoff's Law to obtain the telegraphic equation. The stages in research include: determining the equivalent circuits, making assumptions, applying Kirchoff's Laws I and II to the equivalent circuits, and forming telegraphic equations. The results of this study are to obtain a telegraphic equation which is a partial differential equation with general forms
KAJIAN TENTANG VARIASI KONSENTRASI NaCl DENGAN KETERSEDIAAN ENERGI LISTRIK PADA SEL VOLTA Cu-Zn Tria Winarsih; Ishak Semuel Erari; Abdul Muis Muslimin
Jurnal Natural Vol. 16 No. 2 (2020): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v16i2.111

Abstract

Kajian Tentang Variasi Konsentrasi NaCl Dengan Ketersediaan Energi Listrik Pada Sel Volta Cu-Zn bertujuan untuk menganalisa hubungan antara jumlah sel volta Cu-Zn terhadap besar arus listrik dan tegangan listrik, perubahan arus listrik, tegangan listrik dan daya listrik terhadap waktu, jumlah akumulasi energi pada sel volta Cu-Zn terhadap beberapa konsentrasi NaCl (0,001M; 0,01M; 0,1M; 1M; 10M). Hasil penelitian ini diketahui semakin tinggi konsentrasi NaCl maka tegangan yang dihasilkan semakin kecil sebaliknya jika konsentrasi NaCl tinggi maka arus listrik yang dihasilkan semakin meningkat. Pada penelitian ini konsentrasi NaCl yang paling baik adalah dengan konsentrasi 1 M dibandingkan dengan konsentrasi NaCl lainnya.
STUDI FITOREMEDIASI LOGAM TIMBAL (Pb) DAN KADMIUM (Cd) OLEH TANAMAN KAYAMBANG (Salvinia molesta) Jacson Victor Morin; Darma Santi
Jurnal Natural Vol. 16 No. 2 (2020): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v16i2.112

Abstract

Study phytoremediation of lead (Pb) and cadmium (Cd) by kayambang plants (Salvinia molesta) has been studied. This study assessed the ability of plants to absorb Pb and Cd which is influenced by the addition of various metal and NPK fertilizer on the medium containing the test solution. Samples of plants were interacted with NPK fertilizer, Pb and Cd. The variations of NPK 1 mg/L, I,5 mg/L, 2,5 mg/L and 10 mg/L and the variations of Pb (100 mg/L, 400 mg/L and 800 mg/L) and cadmium (50 mg/L, 100 mg/L and 200 mg/L). Optimum pH for growing the Kayambang plants (Salvinia molesta) is a range pH of 6-7. Observations were made every 7 days until the day of 35th, by measuring levels of Cd and Pb after the interaction of plants (roots, non-roots and growing media). The results showed that the Pb and Cd accumulation are higher at the root compared to non-root (stem and leaf). Effect of NPK fertilizer is very evident in the heavy plant where increasing levels of NPK fertilizer plant, the more heavy weight. The average value of FT in kayambang plants (Salvinia molesta)>1, then the plant can be used as a phytoremediator agent. The highest value FT of Pb is 11.22 and shown on condition [NPK] 10 mg/L, [Pb] 100 mg/L at day of 21th and for highest value FT of Cd is 9.57 and shown on condition [NPK] 10 mg/L, [Cd] 100 mg/L and day of 35th
STUDI KUANTITAS DAN KUALITAS MATA AIR KOBARI JAYA SEBAGAI SUMBER AIR BAKU DI KABUPATEN SUPIORI PROVINSI PAPUA Jacson Victor Morin; Darma Santi
Jurnal Natural Vol. 16 No. 2 (2020): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v16i2.113

Abstract

A study on the quantity and quality of the Kobari Jaya spring in Supiori Regency has been conducted. Research on the quality test of Kobari Jaya springs has never been conducted. This study uses descriptive methods and laboratory tests and uses a comparative method of test results against the quality standard value based on PERMENKES No. 492 Tahun 2010 tentang Persyaratan Air Minum. The test results show that the average meets quality standards. The instruments used to test water samples include AAS and UVVis spectrophotometer. Several parameters such as pH, COD, BOD, DO, Phosphate, Fecal Coliform and Total Coliform exceed the predetermined quality standard values. The cause of this high parameter occurs naturally. The test results concluded that the Kobari Jaya spring is very suitable to be used as a source of raw water supply in the Kobari Jaya area in particular and the Supiori area in general
UJI AKTIVITAS ANTIBAKTERI DAN SKRINING FITOKIMIA EKSTRAK HEKSANA, ETIL ASETAT DAN METANOL TUMBUHAN SURUHAN (Peperomia pellucida L. Kunth) Restianti Restianti; Bimo Budi Santoso; Maria Ludya Pulung
Jurnal Natural Vol. 16 No. 2 (2020): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v16i2.114

Abstract

Antibacterial activity test and screening of phytochemical of extract hexane, ethyl acetate and methanol have been carried out. The extraction of the P.pellucida plants was carried out by the maceration method in stages based on the polarity of the solvent. Analysis of chemical compounds done with phytochemical screening test. Based on the identification of chemical compounds by phytochemical screening, hexane and ethyl acetate extract has been detected only in the presence of flavonoid compounds with moderate categories. Methanol extract contains high-grade alkaloids and moderate flavonoid and tannin compounds. Antibacterial test using disffusion methods suggest that ethyl acetate and methanol extract have categorically strong antibacterial activity againts the S. aureus of 14 mm and 16 mm respectively. Hexane extract and acetate ethyl have a strong inhibition to E. coli of 11 mm and 12 mm respectively. Methanol extract has a weak inhibition to bacteria E. coli and a hexane extract has a weak inhibition to bacteria S. aureus.
AKTIVITAS ANTIBAKTERI DAN KOMPONEN KIMIA EKSTRAK HEKSAN, ETIL ASETAT DAN ETANOL BATANG BROTOWALI (Tinospora crispa Linn) ASAL MANOKWARI Bimo Budi Santoso; Argina Argina; Alfhons D. Sirampun
Jurnal Natural Vol. 16 No. 2 (2020): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v16i2.115

Abstract

Antibacterial activity test and chemical component analysis of hexane, ethyl acetate and ethanol extract of Brotowali stem from Manokwari Regency against B. subtillis and E. coli have been carried out. The extraction of the T. crispa stems was carried out by the maceration method in stages based on the polarity of the solvent. Chemical component analysis was performed using GC-MS and phytochemical tests. Based on the identification of chemical compounds by phytochemical screening, it shows the presence of flavonoids in the hexane extract, while in the ethyl acetate and ethanol extracts there are alkaloids, flavonoids, saponins, and tannins. The results of the chemical component analysis of hexane, ethyl acetate and ethanol extracts with GC-MS showed that the hexane extract contained 55 chemical components with 11 main components, ethyl acetate extract consisted of 39 components with 8 main components and ethanol extract there were 57 components with 8 main components. The results of the antibacterial activity test using the well method showed that the hexane and ethyl acetate extracts showed better antibacterial activity than the ethanol extract against the two types of tested bacteria, namely E. coli and B. subtillis. The antibacterial activity of hexane and ethyl acetate extracts against E. coli was 11.00 and 14.00 mm, respectively and against B. subtillis were 7.00 and 7.50 mm, respectively.
PENERAPAN ANALISIS REGRESI DATA PANEL PADA INDEKS PEMBANGUNAN MANUSIA DI PROVINSI PAPUA BARAT Desti Setya Ningsih; Esther Ria Matulessy; Dariani Matualage
Jurnal Natural Vol. 16 No. 2 (2020): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v16i2.118

Abstract

Panel Data Regression Analysis is a combination of time series data and cross section data. The purpose of this study is to determine the best model for panel data regression analysis on HDI in West Papua Province and to determine the HDI model in West Papua Province. The data used in this study are West Papua data in the 2019 Publication Figures and 2019 Publication Human Development Index data. In the process of determining the best model, estimating model parameters with 3 approaches namely CEM, FEM and REM, then testing model selection, classical assumption test, model equation checking and finally model interpretation. The results of this study indicate that the best regression model is FEM with individual effects and time effects with a good model of 91% which means that HDI in West Papua Province is explained by GRDP, RLS, JPM and UHH. The equation model is as follows: Based on the equations that have been obtained, the variables that have a significant effect on HDI in West Papua Province are RLS and UHH.
KARAKTERISASI ABU KAYU MERBAU (Intsia, spp.): PENGARUH TEMPERATUR DAN LAMA KALSINASI Darma Santi; Jacson Victor Morin
Jurnal Natural Vol. 15 No. 1 (2019): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v15i1.120

Abstract

Characterization of merbau wood ash (Intsia, spp.) due to the influence of temperature and time of calcination has been studied. The variations in calcination temperature were 500 ᴼC (as M500) and 600 ᴼC (as M600), while the variations in the duration of calcination were 1, 2, and 3 hours, noted as M1, M2, and M3, respectively. Characterization was carried out using X-ray diffraction (XRD) and spectroscopic analysis using FT-IR. XRD results identified the presence of CaCO3 species (rhombohedral structure) and K2Si4O9 species with a hexagonal structure on M500. The M600 species identified Si (cubic structure), SiO2 (cubic structure), K2Si4O9 (hexagonal structure), and CaCO3 (rhombohedral structure). In general, the calcination temperature increases the crystallinity of several compounds contained in merbau wood ash. The length of time calcination reduces the absorption peak due to the decomposition and adsorption reactions of the presence of water molecules bound to the ash material of merbau wood (Intsia, spp).
PERANCANGAN DAN KARAKTERISASI ANTENA MONOPOLE SEBAGAI PEMANCAR DAN PENERIMA GELOMBANG WIFI FREKUENSI 2,4 GHZ Kezia Noviani Anou
Jurnal Natural Vol. 15 No. 1 (2019): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v15i1.122

Abstract

Desain dan karakterisasi antena monopole sebagai pemancar dan penerima gelombang wifi dengan frekuensi 2,4 GHz pada pipa besi telah dilakukan. Metode pengambilan data pada penelitian ini dilakukan secara langsung. Jenis antena yang didisain adalah 2 antena monopole 1/4λ yang dibuat dari kawat tembaga dengan ketebalan wire 2.25 mm dan keliling wire 0.004 mm. Antena monopole 1/4λ ini memiliki panjang gelombang sebesar 12,5 cm dan panjang wire 3,125 cm. Karakterisasi parameter antena monopole menggunakan Network Analyzer. Pengujian antena monopole menunjukkan nilai impedansinya adalah Z = 41,4 + j10,8 Ω. Nilai return loss sebesar -10.35 dB pada frekuensi 348 MHz dan lebar bandwidth yang dihasilkan sebesar 3,48 GHz-1,58 GHz = 1,9 GHz dengan frekuensi pusat di 2,4 GHz. Nilai VSWR adalah sebesar 1,358 dB. Nilai VSWR umumnya memiliki nilai 1 ≤ VSWR ≤ 2 dimana dalam keadaan ideal, VSWR bernilai 1. Artinya, impedansi saluran transmisi (port) dengan antena memiliki nilai yang sama sehingga sinyal dapat sepenuhnya ditransmisikan melalui saluran (pipa besi) menuju antena penerima.
PENGARUH PEMANFAATAN LIMBAH CAIR PABRIK KELAPA SAWIT TERHADAP SIFAT KIMIA DAN FISIKA TANAH PADA LAHAN PERKEBUNAN KELAPA SAWIT MILIK PT.PMP KABUPATEN MAYBRAT Aprilia Regita Sari; Markus Heryanto Langsa; Alfhons Daniel Sirampun
Jurnal Natural Vol. 15 No. 2 (2019): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v15i2.125

Abstract

Palm oil mill effluent (POME) is the most abundant waste produced from palm oil mills. POME waste products from palm oil mills can pollute the surrounding environment. The main objective of this study was to determine the use of POME on soil fertility and increase the growth of oil palm plants and minimize negative impacts on the environment. The results of the research obtained are a combination of primary data (results of analysis carried out in oil palm plantations owned by PT PMP, Maybrat Regency before the POME application) and secondary data (results of analysis carried out at Angsana Estate oil palm plantations, South Kalimantan after POME application). The results obtained indicate that generally after the application of POME to the land will increase the value of the bulk density and decrease the value of soil porosity and soil permeability. There was a decrease in the percentage of soil porosity in the application area (LA, 28.75% and Flatbed, 23.47%) compared to without application (LK, 36.83%) in the soil depth up to 30 cm. On soils with a deeper depth (30-60 cm) the percent of land subsidence is almost the same as at a depth of 30 cm. Conversely, the addition of POME in the land application (LA) had an impact on the increase in bulk density (1.81 g / cm3) and soil permeability (4.16 cm / hour) compared without POME (LK) (1.48 g / cm3 and 4.08 cm / hour) for soil samples to a depth of 30 cm. The POME application increases the availability of organic matter (C-organic and nitrogen) in the surface soils. The highest P-available values ​​are seen at a depth of 0-20 cm and 20-40 cm in the flatbed. Also, POME on oil palm land tends to increase nutrient content in oil palm leaves compared to control land (without POME).

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