Garuda - Garba Rujukan Digital

Sintesis Kopoliester dari Îµ- Kaprolakton dan 2,2-dimetil-1,3-Propandiol: Prepolimer Alternatif untuk Sintesis Poliester Berat Molekul Tinggi M. Hasan; S.I. Rahayu; I Made Arcana; Cynthia Linaya Radiman
Jurnal Matematika & Sains Vol 10, No 4 (2005)
Publisher : Institut Teknologi Bandung

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

Copolyesters from Îµ- caprolactone and 2,2-dimethyl-1,3-propanediol have been synthesized by using distannoxane as catalyst. The influence of monomer compositions on viscosity, melting point and structure of polyesters was studied. The results showed that the increase of Îµ- caprolactone content in copolymer increased the melting point and viscosity of polyester. This was supported by the decrease of hydroxyl number of polyester when the Îµ- caprolactone monomers in the copolymers increased.

Synthesis of Copolymers by Ring-Opening Copolymerization of Î´-Valerolactone and 2,2-Dimethyl-1,3-Propandiol Monomers and Their Characterization I Made Arcana; Bunbun Bundjali; M Hasan; Helen Mariani; Shinta Dewi Anggraini
Jurnal Matematika & Sains Vol 13, No 1 (2008)
Publisher : Institut Teknologi Bandung

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

Copolymers of Î´-valerolactone and 2,2-dimethyl-1,3-propandiol monomers P(VL-co-DP) as raw materials in synthesisof poly(urethane-ester) were prepared by a ring-opening polymerization of 2,2-dimethyl-1,3-propandiol and Î´-valerolactone monomers in various composition using 1-hydroxy-3-chloro-tetraisobuthyldistanoxane as a catalyst.Characterizations of polymers were carried out by analysis of functional groups, microstructure, viscosity, hydroxylnumber, and also thermal properties of copolymers. The copolymers of 2,2-dimethyl-1,3-propandiol and Î´-valerolactonemonomers have a triblock chain structure, that is P(VL-block-DP-block-VL) with various chain lengths, which dependon VL/DP ratio used in copolymerization. The increase of Î´-valerolactone composition used in polymerization leads toan increase of molecular weight and melting point as well as a decrease of hydroxyl number of copolymers.

Mahoni wood (Swietenia macrophylla King) contains holoseloluse and lignin. This research has been conducted to using lignin from mahoni wood for made polyurethane Isolate lignin is product isolation mahoni degradation with method increasing 4 gram isolate lignin into 150 ml ethylene glycol content 25 gram solution NaOH. The result of degradation used to synthesis polyurethane, then content of LT-PEG with methylen 4.4 difenil diisocyanaate (MDI) become polyurethane. To identified isolate ligni Mohammad WIJAYA; I Made ARCANA
Jurnal Ilmu dan Teknologi Hasil Hutan Vol. 2 No. 2 (2009): Jurnal Ilmu Teknologi Hasil Hutan
Publisher : Departemen Hasil Hutan, IPB

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

Mahoni wood (Swietenia macrophylla King) contains holoseloluse and lignin. This research has been conducted to using lignin from mahoni wood for made polyurethane Isolate lignin is product isolation mahoni degradation with method increasing 4 gram isolate lignin into 150 ml ethylene glycol content 25 gram solution NaOH. The result of degradation used to synthesis polyurethane, then content of LT-PEG with methylen 4.4 difenil diisocyanaate (MDI) become polyurethane. To identified isolate lignin and product degradation lignin has been conducted to characterized with UV and FTIR method. The result shows that the specified spectra at maximum wavelength at 280 nm and 248 nm. While result from FTIR spectra shows that spevtra at wavenumber 1296 cm-1 and 1249 cm-1 is shows of propile guaiasil group. The function group propel siringile. While lignin from kind at siirngile, while the spectra at 1354 cm-1. The result synthesis polyurethane to characterized by the mechanical properties analysis with Tensile tester machine. It is therefore mechanical properties shows that Tensile strength and Young modulus bigger wuth enhancing lignin of content into polyurethane but percentage elongation increase. Keywords : Mahoni wood, isolate lignin, degradation lignin, polyurethane

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. 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

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

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

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

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

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.

Pengaruh Faktor Sosial Demografi terhadap Kemiskinan Anak di Indonesia Tahun 2021 : Elza Robasa; I Made Arcana
Seminar Nasional Official Statistics Vol 2022 No 1 (2022): Seminar Nasional Official Statistics 2022
Publisher : Politeknik Statistika STIS

Child poverty is a state when children experience a lot of loss of their basic rights, such as adequate food, housing, health, safe drinking water. Proper sanitation facilities, information, education, and access to services. Fulfillment of children’s basic rights during their growth and development needs to be considered in order to become a quality future generations of the nation. The quality of children whose basic rights are not fulfilled has potential to create poor individuals and trapped in a cycle of poverty. The purpose of this study is to find out the general description of child poverty in multidimensional manner using Multiple Overlapping Deprivation Analysis (MODA) and identify socio-demographic factors that affect child poverty in Indonesia in 2021 by applying a binary logistic regression model. The results showed that the percentage of multidimensional child poverty in Indonesia in 2021 was 49.5 percent. In addition, child’s age, child’s gender, age of household head, gender of household head, working status of household head, education of household head, parenting status, number of household members significantly affect the multidimensional poverty of children in Indonesia. The tendency of children in the age group 0-4 years to experience deprivation on children's rights in a multidimensional manner was 3.5 times compared to children in the age group 5-17 years.

Title

Found 10 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 10 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 10 Documents
Search