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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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ANALISIS KADAR BIOETANOL HASIL FERMENTASI DARI NIRA NIPAH (Nypa fruticans wurmb) ASAL PAPUA Sefnat Sopater Runtuboi; Maria Ludya Pulung; Evelina Somar
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.v15i2.127

Abstract

This study aims to analyze the ethanol content in fermented palm juice.This research includes the preparation of raw materials, fermentation, distillation and distillation products analyzed by gas chromatography method. Fermentation is carried out for 2, 5, 7 days, the highest level of bioethanol produced is then selected for distillation. Levels the highest fermentation process is on the 5th day with a level of 18%. Got results the final distillation is 117 mL with a level of 94% of the initial volume of 4.2 L fermentation based on measurements using an alcoholmeter while the analysis by gas chromatography yielded 93.9% levels. The density of bioethanol is 0.8232 gr / mL. The results of the retention time measurement show the sample has a retention time which is almost the same as standard ethanol, namely 3,761 standard ethanol samples 3,764. From retention time data can be concluded that the sample is ethanol. Ethanol content in sample based on analysis by gas chromatography is 93.9%
EVALUASI HIDROLOGI DAERAH ALIRAN SUNGAI WOSI DALAM MENGHADAPI CURAH HUJAN EKSTRIM Khristian Enggar Pamuji; Hardianti Hardianti
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.v15i2.128

Abstract

Daerah Aliran Sungai Wosi merupakan DAS yang berada di Distrik Manokwari Barat, Kabupaten Manokwari, Papua Barat. Dalam dekade terakhir, DAS Wosi telah menjadi sumber bencana bagi sebagian penduduk yang tinggal di sekitar atau di daerah hilir sungai Wosi. Ketika curah hujan tinggi, Sungai Wosi tidak dapat menampung debit aliran air, sehingga bencana banjir tidak dapat dihindarkan. Penelitian ini bertujuan untuk mengetahui karakteristik DAS Wosi, menentukan kapasitas tampung maksimum sungai dan mengevaluasi peranan atau fungsi hidrologis DAS Wosi dalam mencegah banjir. Daerah penelitian berada di Daerah Aliran Sungai Wosi Kabupaten Manokwari. Penelitian ini dimulai dengan pengumpulan data serta analisis data primer dan data sekunder. Data yang dikumpulkan berupa data curah hujan Manowkari, dimensi sungai dan data spatial tutupan lahan di DAS Wosi. Data-data tersebut kemudian digunakan untuk mengetahui karakteristik hidrologi sungai, debit puncak aliran dan kapasitas tapung maksimum sungai. Hasil yang diperoleh menunjukan bahwa pada beberapa titik pengamatan, kapasitas tampung maksimum sungai lebih kecil dari debit puncak aliran permukaan. Debit puncak ini didominasi oleh aliran permukaan yang berasal dari daerah yang tertutup semak belukar/alang-alang. Meskipun tutupannya hanya 41 % dari total luasan DAS, namum semak belukar/alang-alang telah menyumbang 48 % dari total debit air yang masuk kedalam Sungai Wosi. Hasil evaluasi menunjukan bahwa fungsi hidrologis DAS Wosi sebagai penyangga kejadian puncak hujan dan pengendali banjir saat curah hujan lebat atau ekstrim kurang berfungsi dengan baik.
PERBANDINGAN ANTARA MODEL AUTOREGRESSIVE INTEGRATED MOVING AVERAGE (ARIMA) DAN MODEL FUNGSI TRANSFER PADA PERAMALAN CURAH HUJAN DI KABUPATEN MANOKWARI Esther Ria Matulessy
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.v15i2.138

Abstract

This study discusses the comparison of forecasting time series data between the Autoregressive Integrated Moving Average (ARIMA) method and the multi input transfer function model. ARIMA method is one of the most frequently used methods for forecasting time series data. Meanwhile, the transfer function model is a combination of the characteristics of multiple regression analysis with the characteristics of the ARIMA time series. Meanwhile, the multi input transfer function model is a transfer function model that has input variables of more than two time series. The application of these two methods is carried out on rainfall data from January 2012 to December 2017 in Manokwari Regency, West Papua Province. The input variables used are temperature, humidity, solar radiation, air pressure, and wind speed variables. The results showed the best ARIMA model was ARIMA (1,0,0) (2,0,0) 12 with an AIC value of 910.07, while for the best multi input transfer function model was ARIMA (1,1,0) AIC value of 898.24. Between the two methods, the best model used to forecast rainfall in Manokwari Regency, West Papua Province is the multi-input transfer function model (1,1,0).
MATRIKS BAKU UNTUK TRANSFORMASI LINIER PADA RUANG VEKTOR DIMENSI TIGA Khasnah Aris Friantika; Harina O. L. Monim; Rium Hilum
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.v15i2.140

Abstract

The linear transformation is a function relating the vector ke . If , then the transformation is called a linear operator. Several examples of linear operators have been introduced since SMA such as reflexive, rotation, compression and expansion and shear. Apart from being introduced in SMA, these linear operators were also introduced to the linear algebra course. Linear transformations studied at the university level include linear transformation in finite dimension vector spaces . The discussion includes how to determine the standard matrix for reflexive linear transformations, rotation, compression and expansion and given shear. Through the column vectors of reflexive, rotation, compression and expansion and shear, a standard matrix of 2x2 size is formed for the corresponding linear transformation. however, in this study, the authors studied linear transformations in dimensioned vector spaces . The results of this study are if known is a vector space with finite and the standard matrix for reflexivity, rotation, expansion, compression and shear is obtained. Each of these linear transformations is performed on x-axis, y-axis and z-axis on to get column vectors. The column vectors as a result of the linear transformation at form the standard matrix for the corresponding linear transformation in the vector space. The standard matrix for linear transformations in the vector space is obtained by determining reflexivity, rotation, expansion, compression and shear. The process of obtaining a standard matrix for linear transformation is carried out by rewriting the standard basis, determining the column vectors, and rearranging them as the standard matrix for each linear transformation in the vector space
PEMBUATAN SISTEM VAKUM OTOMATIS GAS H2S BERBAHAN TiO2-Ni/Al2O3 TERKONEKSI ARDUINO UNO PADA LABORATORIUM KIMIA Jacson Victor Morin; Darma Santi
Jurnal Natural Vol. 17 No. 1 (2021): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v17i1.141

Abstract

Research has been carried out on the H2S gas sensor made of TiO2-Ni/Al2O3 which is connected to an automatic vacuum. The results showed that the optimum conditions for the variation of Ni doping metal levels were 20 mg / gram TiO2. The semiconductor material synthesis method used the sol gel method with TTiP precursor which was made at pH 7. Coating of the sol gel solution on the Al2O3 substrate used a dip coater with a decrease speed of 1 cm / minute and was carried out 7 times of immersion. The characterization of synthetic results used UVVis, XRD, FTIR and SEM-EDX. The band gap value resulting from Ni doping is 2.75 eV from 3.2 eV, XRD identification shows that TiO2 is anataseic and detected at 2θ. FTIR data also supports XRD results with detection of TiO2, Ni-O, NiTiO3, Ti-O-Ni, and Ti-O-Ti groups. TiO2-Ni / Al2O3 sensor test results are very sensitive and selective to H2S gas. Arduino Uno sensor and microcontroller connectivity can change the unit of resistance into a unit of ppm concentration and can drive the exhaust (vacuum) automatically in the laboratory room or chemical storage space when there is H2S.
POTENSI KITOSAN DARI LIMBAH CANGKANG UDANG Penaeus monodon ASAL BINTUNI SEBAGAI BIOSORBEN LIMBAH ORGANIK DAN LOGAM BERAT PADA LIMBAH CAIR PLTD MANOKWARI Lancyfolia Rumaropen; Bertha Mangallo; Muhammad Fajar Islam
Jurnal Natural Vol. 17 No. 1 (2021): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v17i1.142

Abstract

The purpose of this research is to study the potency of chitosan synthesis of shrimp shells from Bintuni as a biosorbent of organic compound and heavy metal compound. The main procedure of chitosan synthesis is completed by insulating chitin from shrimp shells and then chitin is deacetilated to transform chitin to be chitosan. The wastewater were characterized to know the concentration of Total Organic Carbon (TOC), fat oil, and Zinc metal and studied the adsorption of each compound at 0,1; 0,5; 1; 2g dosage chitosan. Adsorption study result showed that chitosan can adsorb the fuel oil and Zinc metal which contained in wastewater. However, it was not adsorb the TOC compound. The yield of chitosan is 46,88%. Increasing the chitosan by up to 2 g resulted in the creasing of the adsorption effectiveness up to 99,09% for the fuel oil and 69,28% for Zinc. The maximum chitosan adsorption capacity accomplished at 0,1gram chitosan in 100 mL wastewater.
IDENTIFIKASI KAWASAN NILAI KONSERVASI TINGGI 4 (NKT 4) DI DAERAH ALIRAN SUNGAI WAFOR, KABUPATEN SUPIORI, PROVINSI PAPUA Khristian Enggar Pamuji
Jurnal Natural Vol. 17 No. 1 (2021): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v17i1.143

Abstract

Salah satu atribut dalan NKT adalah Kawasan yang memberikan jasa ekosistem dasar pada situasi yang kritis atau sangat penting. Suatu wilayah dapat dipertimbangkan sebagai NKT 4 jika berperan dalam melindungi atau menyediakan jasa ekosistem mendasar dalam situasi penting, termasuk perlindungan daerah tangkapan air dan kontrol erosi pada tanah rentan dan lereng. Saat ini telah dilakukan penilaian keberadaan NKT 4 Daerah Aliran Sungai (DAS) Wafor yang berada di Distrik Supiori Timur, Kabupaten Supiori, Provinsi Papua. Sungai-sungai di DAS Wafor dimanfaatkan oleh masyarakat lokal sebagai sumber air bersih. Sungai Wafor memiliki rasio relief rata-rata antara 0.04, namum dibeberapa tempat terutama bagian hulu, kemiringan lereng mencapai 30%-40%. Faktor bentuk (Form factor/ Rf) DAS Wafor memiliki nilai 0.62 atau bentuk DAS relatif membulat dan rasio elongasi sebesar 0.71. Daerah aliran sungai yang membulat, debit puncak datangnya lama, begitu juga penurunannya, sehingga dapat efektif dalam mengendalikan banjir.DAS Wafor memiliki kerapatan drainase (Dd) 1,03 km/km2, artinya setiap 1 km2 area DAS terpadat panjang total sungai 1,03 km. Kerapatan drainase ini termasuk kategori sedang. Hal ini tentunya akan sangat membantu dalam menghalangi penyebaran titik-titik api jika terjadi kebakaran hutan. Sedimentasi di Sungai Wafor termasuk kategori rendah atau < 50 mg/L. Dengan alur sungai rata-rata tidak lebih dari 20 km, maka dapat disimpulkan bahwa DAS tersebut bekerja efektif dalam mengendalikan erosi.
VARIASI KUAT MEDAN MAGNET DAN DAYA LISTRIK INPUT TERHADAP KARAKTERISTIK MOTOR LISTRIK DC DUA KUTUB Karim karim; Ishak Semuel Erari; Abdul Muis Muslimin
Jurnal Natural Vol. 17 No. 1 (2021): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v17i1.144

Abstract

Penelitian tentang variasi medan magnet dan daya listrik input terhadap karakteristik motor listrik DC bertujuan untuk mengetahui pengaruh kuat medan magnet dan pengaruh besar daya listrik input terhadap RPM, efisiensi, dan torsi motor listrik DC serta mengetahui pengaruh kuat medan magnet permanen terhadap daya listrik input. Penelitian ini merupakan penelitian eksperimen, yang dimulai dengan pembuatan alat, pengambilan data, kemudian pengolahan data. Dalam pengambilan data, data yang diukur adalah tegangan listrik input, tegangan listrik output, arus listrik input, arus listrik output dan RPM. Hasil dari pengolahan data diperoleh bahwa setiap penambahan jumlah magnet akan menyebabkan RPM meningkat, daya listrik menurun, torsi menurun, dan efisiensi yang paling tertinggi 80.564% pada jumlah satu magnet. Sedangkan setiap penambahan daya listrik input menyebabkan RPM meningkat, torsi meningkat, dan efisiensi tertinggi pada tegangan listrik power supply 12 Volt yaitu 83.366%.
PERANCANGAN ALAT TIMBANGAN DIGITAL BERBASIS ARDUINO LEONARDO MENGGUNAKAN SENSOR LOAD CELL Abdul Muis Muslimin; Titin Lestari
Jurnal Natural Vol. 17 No. 1 (2021): Jurnal Natural
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v17i1.145

Abstract

Kemajuan teknologi membawa perubahan pada peralatan-peralatan yang dahulu bekerja secara analog, mulai dikembangkan dengan teknik digital dan bahkan yang bekerja secara manual sekarang mulai banyak dikembangkan secara otomatis, seperti halnya alat timbang digital. Timbangan digital merupakan alat ukur untuk mengukur massa benda atau zat dengan tampilan digital. Penelitian ini dibuat dengan tujuan menghasilkan sebuah alat timbangan digital berbasis board Arduino Leonardo. Arduino Leonardo telah terintegrasi dengan mikrokontroler Atmega32u4, menggunakan load cell sebagai sensor beban dengan tampilan nilai beban menggunakan LCD jenis 16 x 2 sehingga hasil pengukuran dapat lebih mudah dibaca dan memiliki ketelitian yang lebih baik dibanding timbangan analog. Pengujian alat dilakukan dengan membandingkan antara timbangan yang dibuat dengan timbangan standar. Peralatan yang dibuat mendekati tingkat akurasi peralatan standar (Kern PCB 1000-2), dimana selisih rata-rata adalah 0,66 gram.
MODEL SIR (SUSCEPTIBLE, INFECTED, REMOVED) PENYEBARAN COVID-19 DI PROVINSI PAPUA BARAT: MODEL SIR (SUSCEPTIBLE, INFECTED, REMOVED) PENYEBARAN COVID-19 DI PROVINSI PAPUA BARAT Triono Wahyu Diamtoro; Tri Widjajanti Widjajanti; Dariani Matualage
Jurnal Natural Vol. 17 No. 2 (2021): JURNAL NATURAL
Publisher : FMIPA Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30862/jn.v17i2.146

Abstract

Coronavirus Disease 2019 (COVID-19) is an infectious disease that has been declared a global pandemic by the World Health Organization (WHO). Indonesia is one of the countries affected by this disease and has spread to all provinces including West Papua Province. The purpose of writing this article is to determine a model for the spread of COVID-19 in West Papua, to analyze the point of equilibrium and stability and to determine the basic reproduction number R_0 model. The model used is the SIR epidemiological model and to analyze the equilibrium point and data collection, the author used the Mapple 13 application. The result of this study are a mathematical model based on the assumptions of the spread of COVID-19 in West Papua namely:dS/dt=-βSI/N.dI/dt=βSI/N-αI.dR/dt=αI.The equilibrium obtained based on the equilibrium analysis is the non-endemic equilibrium point, namely E=(S_0,I_0,R_0 )=(N,0,0)which is categorized as stabil neutral. The basic reproduction number (R_0 ) obtained based on the SIR COVID-19 model in West Papua isR_0=β/αwith R_0=1,2. Because the value of R_0>1 means that the spread of COVID-19 in West Papua will increase to become an epidemic. Keywords: SIR, COVID-19, Equilibrium Point, Basic Reproduction Number.

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