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I Made Arcana
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SINTESIS SELULOSA ASETAT DARI TANDAN KOSONG KELAPA SAWIT DAN SIFATNYA SEBAGAI MEMBRAN POLIMER ELEKTROLIT PADA BATERAI ION LITIUM Nurhadini Nurhadini; I Made Arcana
JURNAL KIMIA MULAWARMAN Vol 15 No 2 (2018)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v15i2.612

Abstract

Biodegradable polymer electrolyte utilization on lithium ion battery is increasingly considered to prevent any waste. This study was conducted to synthesis cellulose acetate from oil palm empty fruit bunch and its properties as polymer electrolyte membranes on lithium ion battery. This study was done by extracting cellulose from oil palm empty fruit bunch. That cellulose was acetylated become cellulose acetate and characterized its functional group. Further, polymer electrolyte was synthesized with composition 25/60/15(%b/b) (SAS/PEO/LiClO4). The properties of polymer electrolyte membranes were characterized by analysis thermal properties, ionic conductivity and mechanical properties. Based on functional group data, synthetic cellulose acetate had similar the main functional group with commercial cellulose acetate. Synthetic cellulose acetate contained 27% acetyl with 1,4 substitution degree. Analysis thermal properties showed that the decomposition of SAS/PEO/LiClO4 polymer electrolyte membranes was started above 260oC. The ionic conductivity 10,81 x 10-4 S/cm of these polymer electrolyte membranes was 10,81 x 10-4 S/cm. Analysis of mechanic properties were 0,05 MPa stress, 14,23 MPa elongation and 0,35 MPa Modulus Young. SAS/PEO/LiClO4 polymer electrolyte membranes had higher ionic conductivity than SAK/PEO/LiClO4 polymer electrolyte membranes. However, SAS/PEO/LiClO4 polymer electrolyte membranes had lower thermal and mechanic properties than SAK/PEO/LiClO4 polymer electrolyte membranes.
Structure and Properties of Polymers Prepared by Polymerization of 2,2-Dimethyl-1,3-Propandiol and ε-Caprolactone Monomer I Made Arcana; M. Hasan; Shinta Dewi Anggraini; Asti Ardhyo Febrianti; Aditya Ardana
Journal of Mathematical and Fundamental Sciences Vol. 41 No. 2 (2009)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2009.41.2.2

Abstract

Poly(ε-caprolactone) (PCL) is very attractive synthetic polymer due to its properties, such as a high permeability, the lack of toxicity, and also biodegradability. However, it has limited application because of low melting point (60 °C), high crystallinity, and brittleness. The aim of the experiments is designed to improve the properties of PCL by formation of their polymers with 2,2-dimethyl-1,3-propandiol monomers with various chain length as a raw material to prepare poly(urethane-ester). These polymers were synthesized by a ring-opening polymerization of 2,2-dimethyl-1,3-propandiol and ε-caprolactone monomers in various composition in the presence of 1-hydroxy-3-chloro-tetraisobuthyldistanoxane as a catalyst. Polymers were characterized by analysis of functional groups (FTIR), microstructure (1H and 13C NMR), viscosity, hydroxyl number, and also melting point of polymers (DSC). Based on the structure analysis indicate that polymerization of 2,2-dimethyl-1,3-propandiol and ε-caprolactone monomers produced polymers with various molecular weights, which depend on the ratio of ε-caprolactone / 2,2-dimethyl-1,3-propandiol used in polymerization. The reactivity of CL monomer decreases to the active site of polymers with longer chain size. The melting points of polymers increase with the increasing of ε-caprolactone composition used in polymerization, whereas hydroxyl number decreases.
Properties of Polymer Electrolyte Membranes Prepared by Blending Sulfonated Polystyrene with Lignosulfonate Siang Tandi Gonggo; Cynthia L. Radiman; Bunbun Bundjali; I Made Arcana
Journal of Mathematical and Fundamental Sciences Vol. 44 No. 3 (2012)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2012.44.3.8

Abstract

A polymer electrolyte membrane widely used in PEMFCs and DMFCs is a perfluorosulfonated membrane (the Nafion membrane). This perfluorosulfonated membrane material exhibits good chemical stability and proton conductivity, but it is very expensive and difficult to recycle. There is a high methanol crossover in DMFCs that causes a decrease in efficiency and performance of the fuel cell, so that a polymer electrolyte membrane with a low methanol crossover is needed as a substitute for the Nafion membrane. One of the materials that can be used as a polymer electrolyte membrane is the polyblends from sulfonated polystyrene-lignosulfonate (SPS-LS). Such polyblends were prepared by casting a polymer solution and characterized as polyelectrolyte membrane for DMFCs. The SPS was prepared by sulfonation of polystyrene with acetyl sulfate as the sulfonating agent. The membranes of the SPS-LS were characterized by analysis of functional groups, mechanical properties and methanol permeability. The maximum mechanical properties of the SPS-LS membrane were observed at an LS ratio of 7.5%. However, the methanol permeability of the membrane increased with the increase of the LS ratio in the SPS-LS membranes. The properties of the membranes, especially their mechanical properties and methanol permeability, were close to that of Nafion® 117 membrane, so SPS-LS membranes have high potential for use as polymer electrolyte membrane for direct methanol fuel cells.
Poly(urethane) synthesized from 9-ethoxy-1,10-octadecanediol obtained by modification of palm oil oleic acid Bunbun Bundjali; Muhammad Masykuri; Fitri Widya Hartanti; I Made Arcana
Journal of Mathematical and Fundamental Sciences Vol. 50 No. 1 (2018)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2018.50.1.2

Abstract

Poly(urethane) (PU) as a prepolymer was prepared by polymerization of the diol compound (9-ethoxy-1,10-octadecanediol) and 4,4-methylen-bis phenyl isocyanate (MDI) under nitrogen atmosphere at 85 °C. The 9-ethoxy-1,10-octadecanediol was obtained by several reaction steps, i.e. epoxydation of oleic acid obtained from palm oil, ring-opening of oleic acid epoxide, and reduction of oleic acid ester. All compounds obtained in this work were characterized by chemical structure analysis (FTIR and 1H NMR), supported by analysis of iodine value, acid value, and hydroxyl value determined by titration methods and thermal analysis, especially for poly(urethane). The 9-ethoxy-1,10-octadecanediol as the diol compound for preparation of poly(urethane) was analyzed by FTIR, supported by hydroxyl numbers determined by titration. Poly(urethane-urea) (PUU) was obtained by addition of ethylene diamine as chain extender to poly(urethane). The thermal stability of poly(urethane-urea) is higher than that of poly(urethane). The addition of ethylene diamine as chain extender in poly(urethane) can improve the intrinsic viscosity of polymer to form poly(urethane-urea). These results are supported by chemical structure analysis.
Structure and Thermal Property of Poly(R,S)-B-Hydroxybutyrate Synthesized by Aluminoxane Catalyst. I Made Arcana
Journal of Mathematical and Fundamental Sciences Vol. 32 No. 1 (2000)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstract. Poly(R,S)-B-hydroxybutyrate (PHB) was synthesized by ring-opening polymerization of racemic (R,S)-B-butyrolactone using tetraisobutyldialuminoxane (TIBAO) as catalyst. In previous studies, some factors or polymerization conditions such as polymerization suhue, polymerization time, nature of solvent, catalyst concentration, and modification of the catalyst system by water addition were varied to obtain optimal polymerization-results based on yield and molecular weight of polymers obtained. This study was emphasized on characterization of polymer by 13C NMR spectroscopy and Differential Scanning Calorimetry (DSC) to obtain informations about chemical structure and thermal properties of polymer obtained using tetraisobutyldialuminoxane catalyst. These analyses showed that tetraisobutyldialuminoxane catalyst produced partially stereoregular polymer depending on the quantity of water added to TIBAO catalyst. Extraction of polymer with acetyl-acetone (AcAc) or acetone separated the polymer into a soluble atactic fraction with amorphous structure and an insoluble isotactic fraction with crystalline structure. Addition of a certain quantity of water to the catalyst and treatment of polymer by solvent extraction have resulted in an increase in stereoregularity and crystallinity of polymer.
PENERAPAN CHAID DENGAN PENDEKATAN SMOTE PADA KEMATIAN BALITA DI KAWASAN TIMUR INDONESIA TAHUN 2017 Isti Samrotul Hidayati; I Made Arcana
Seminar Nasional Official Statistics Vol 2019 No 1 (2019): Seminar Nasional Official Statistics 2019
Publisher : Politeknik Statistika STIS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (384.973 KB) | DOI: 10.34123/semnasoffstat.v2019i1.97

Abstract

Metode Chi-squared Automatic Interaction Detection (CHAID) merupakan metode segmentasi berdasarkan hubungan variabel respon dan penjelas menggunakan uji chi-square, yang dalam penerapannya perlu memperhatikan keseimbangan data untuk meminimalkan kesalahan dalam klasifikasi. Salah satu pendekatan yang dapat digunakan pada data yang tidak seimbang adalah metode Synthetic Minority Over-sampling Technique (SMOTE). Dalam penelitian ini, metode CHAID dengan pendekatan SMOTE diterapkan pada Angka Kematian Balita (AKBa) di Kawasan Timur Indonesia (KTI). Tujuannya adalah untuk mengetahui variabel-variabel yang mencirikan kematian balita berdasarkan metode analisis CHAID yang diterapkan dan membandingkannya dengan pendekatan SMOTE. Hasil perbandingan menunjukkan bahwa pendekatan SMOTE lebih baik digunakan dengan nilai sensitivitas sebesar 48,3% dan nilai presisi sebesar 75,9%. Variabel yang signifikan mencirikan kematian balita di KTI adalah berat badan saat lahir, jenis kelahiran, status bekerja ibu dan kekayaan rumah tangga, dengan karakteristik utama adalah balita yang memiliki berat badan lahir rendah dan terlahir kembar.
PEMBENTUKAN INDEKS MUTU PENDIDIKAN (IMP) DI INDONESIA TAHUN 2018 DAN FAKTOR YANG MEMENGARUHINYA Fenny Afifatul Awwaliyah; I Made Arcana
Seminar Nasional Official Statistics Vol 2020 No 1 (2020): Seminar Nasional Official Statistics 2020
Publisher : Politeknik Statistika STIS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (405.654 KB) | DOI: 10.34123/semnasoffstat.v2020i1.358

Abstract

Mutu pendidikan merupakan salah satu aspek yang dipertimbangkan dalam meningkatkan kualitas sumber daya manusia suatu bangsa. Mekanisme penilaian mutu pendidikan di Indonesia, khususnya pendidikan dasar dan menengah, dilakukan oleh BAN-S/M melalui proses akreditasi. Namun, realisasi penilaian yang dilakukan masih belum mencakup semua sekolah yang ada, sehingga belum dapat menggambarkan mutu pendidikan pada tingkat wilayah. Oleh karena itu, penyusunan Indeks Mutu Pendidikan (IMP) perlu dilakukan sebagai alat ukur terhadap mutu pendidikan pada setiap jenjang pendidikan maupun pada tingkat wilayah (34 provinsi di Indonesia) berdasarkan kerangka teori Kemendikbud dengan menerapkan metode rata-rata geometrik. Mutu pendidikan yang digambarkan dengan IMP berkorelasi negatif dengan ketimpangan gender yang diukur menggunakan Indeks ketimpangan Gender (IKG) dan berkorelasi positif dengan pembangunan manusia yang diukur menggunakan Indeks Pembangunan Manusia (IPM). Mutu pendidikan di Indonesia berdasarkan nilai IMP berada pada kategori sedang dengan nilai terendah untuk dimensi prasarana. Selain itu, hasil analisis regresi logistik ordinal memperlihatkan bahwa faktor sosial ekonomi yang memengaruhi IMP dengan tingkat signifikansi 10 persen, adalah persentase penduduk miskin, persentase rumah tangga dengan kepemilikan tanah/lahan, rata-rata persentase pengeluaran ruta untuk bukan makanan, persentase KRT yang memiliki ijazah minimal SMA, dan nilai IKG.
DETERMINAN PERILAKU REMAJA MEROKOK SETIAP HARI DI INDONESIA Charvia Ismi Zahrani; I Made Arcana
Seminar Nasional Official Statistics Vol 2020 No 1 (2020): Seminar Nasional Official Statistics 2020
Publisher : Politeknik Statistika STIS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (327.721 KB) | DOI: 10.34123/semnasoffstat.v2020i1.412

Abstract

Prevalensi remaja yang merokok terus mengalami kenaikan pada beberapa tahun terakhir. Lebih dari separuh remaja yang merokok merupakan perokok setiap hari. Kebiasaan merokok yang dimulai sejak remaja akan meningkatkan ketergantungan pada masa tua. Hal ini sangat mengkhawatirkan mengingat dampak negatif dari merokok dapat menyebabkan berbagai macam penyakit hingga kematian. Risiko ini akan meningkat apabila perilaku merokok dilakukan setiap hari. Penelitian ini bertujuan untuk mengetahui karakteristik sosial demografi yang memengaruhi perilaku remaja merokok setiap hari di Indonesia beserta kecenderungannya. Analisis deskriptif dan analisis regresi logistik biner dilakukan pada data remaja berusia 15-24 tahun yang merokok yang bersumber dari data Riskesdas 2018. Hasil penelitian menunjukkan bahwa jenis kelamin, status wilayah tempat tinggal, status perkawinan, tingkat pendidikan, status bekerja, dan usia pertama merokok memiliki pengaruh signifikan terhadap perilaku merokok setiap hari. Kecenderungan terbesar untuk berperilaku merokok setiap hari ditunjukkan oleh remaja laki-laki, remaja berstatus bekerja, dan remaja yang merokok pertama kali pada usia di bawah 18 tahun.
TINGKAT RISIKO PUTUS SEKOLAH PADA REMAJA DI PROVINSI PAPUA TAHUN 2018 Rintan Auliyah Rahma; I Made Arcana
Seminar Nasional Official Statistics Vol 2020 No 1 (2020): Seminar Nasional Official Statistics 2020
Publisher : Politeknik Statistika STIS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (182.997 KB) | DOI: 10.34123/semnasoffstat.v2020i1.468

Abstract

The compulsory education program has been implemented since 1994. However, the mean years of schooling of youth in Papua Province is still below the national figure and is the lowest mean years of schooling in Indonesia. Meanwhile, the rate of continuing to high school in Papua Province is also the lowest order and has a gap that is quite far compared to West Papua Province. Youth should be or have completed 12 years of compulsory education. However, the low rate of continuing to high school indicates that there are youth who have dropped out of school. The incidence of dropping out of school will encourage youth to enter the job market early. By using survival analysis, this study aims to determine the socio-demographic background of youth who have dropped out of school. Youth who come from poor households status have the highest risk of dropping out of school. Youth with household heads who work in informal sector and unemployment household heads have a higher risks to not complete education, than household heads who work in formal sector.
Risiko Kematian Pasien Covid-19 dan Faktor yang Memengaruhinya Margareth Dwiyanti Simatupang; I Made Arcana
Seminar Nasional Official Statistics Vol 2021 No 1 (2021): Seminar Nasional Official Statistics 2021
Publisher : Politeknik Statistika STIS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (394.161 KB) | DOI: 10.34123/semnasoffstat.v2021i1.1085

Abstract

The number of cases of Coronavirus disease 2019 (Covid-19) in Indonesia has increased, which the percentage of increasing the number of cases in Sumatra is relatively higher than cases at national level. The rapid spreading of Covid-19 has affected to increasing the number of people being infected and died of Covid-19. This study aims to determine the characteristics of survival status of Covid-19 patients and factors affecting their death risk. The research was conducted at H. Adam Malik Hospital, as a referral hospital for Covid-19 patients, and an educational hospital. The research data was obtained from recording of the medical condition of Covid-19 patients in the period of March-October 2020. The statistical method used for data analysis was survival model, particularly the proportional hazard model applying the exponential distribution. The analysis results showed that Covid-19 patients with higher death risk occurred to male patients, having symptoms of dyspnea, comorbidities, and high severity.
Co-Authors Aditya Ardana Asti Ardhyo Febrianti Budiman Anwar Bunbun Bundjali Charvia Ismi Zahrani Cynthia L. Radiman Cynthia Linaya Radiman Deana Wahyuningrum Elza Robasa Fajar, Adroit T. N. Fenny Afifatul Awwaliyah Fitri Widya Hartanti Helen Mariani Ismunandar Isti Samrotul Hidayati K. Nagesh Kadja, Grandprix T. M. M Hasan M. Hasan M. Hasan Mardiana, St Margareth Dwiyanti Simatupang Mohammad WIJAYA Muhammad - Muhammad Masykuri Ndruru, Sun Theo Constan Lotebulo Nurhadini Nurhadini Ramakrisnan Rama Rintan Auliyah Rahma S. F. Nanda, Arxhel S.I. Rahayu Shinta Dewi Anggraini Shinta Dewi Anggraini Siang Tandi Gonggo Sun Theo Constan Lotebulo Ndruru Sun Theo Constan Lotebulo Ndruru