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All Journal Katalogis AGRISAINS Jurnal Pendidikan Matematika dan IPA Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Indonesian Journal of Early Childhood Education Studies Jurnal Kinerja Kependidikan (JKK)
Nirwana, Nirwana
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Agriculture, Biological Sciences & Forestry Chemistry Education Engineering Law, Crime, Criminology & Criminal Justice Mathematics Physics Social Sciences Other

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Pengaruh Komposisi Katalis H-Zeolit Dan Kecepatan Pengadukan Terhadap Karakteristik Isopropil Oleat Ardiana, Amalia; Nirwana, Nirwana; HS, Irdoni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Crude palm oil uses to term downstream industries in indonesia still at low, because of that we need to develop in downstream products. In addition, one of them which developed is fatty acid alkyl ester. Downstream products that included in fatty acid alkyl ester is plastisizer. Plastisizer is additive substance that added into polymer to increase flexibility and workability with esterification process. esterification is process between carboxiclic acid and alcohol to form ester and water as byproduct. In this research, plastisizer synthesized by esterification of oleic acid and isopropanol with activated natural zeolit as catalyst. This process was doing with variation of stirrer speed (175, 200 and 225 rpm) and composition of catalyst (12.5, 15 and 17.5%) also as fixed variable is temperature of reaction at 75 - 80°C, the reaction time of 6 hours and molar ratio of 1:9 oleic acid based. From esterification analysis result we can look that strirrer speed  and composition of catalyst influenced rate of reaction to reach the equlibrium. The best operating condition in this reasearch has got at 17.5% composition of catalyst and 200 rpm of stirrer speed that produce 59.27% conversion. Product that has been produced is methyl ethyl ester, oleic acid, Methyl Ester, Dihidroxypropyl Ester and Isopropyl Ester. Characteriztion of plastisizer that has produced from this research is viscosity at (200 C ) is 4,360 – 5,882 mPa.s and specific gravity  (200 C) is 0,785 – 0,844.  Keywords: Esterification, H-Zeolit , Isopropanol, Oleic Acid, Plasticizer
The Effect of Gadget Toward Early Childhood Speaking Ability Nirwana, Nirwana; Mappapoleonro, A Musda; Chairunnisa, Chairunnisa
Indonesian Journal of Early Childhood Education Studies Vol 7 No 2 (2018): November 2018
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijeces.v7i2.28548

Abstract

This study examines the effect of gadget toward early childhood speaking ability especially those in the age range of 3-4 years. The 3-4 years old children generally have enthusiasm in speaking, their curiosity tend to be greater, such as telling something that happened around them to the closest person. However, the presence of gadget in this digital era has negative influences on their speaking ability. The majority of children in Indonesia spend time playing gadget. The study seeks to explain the use of gadget toward early childhood speaking ability. The methodological approach taken in this study is literature review by connecting this study with existing literature and previous researches which have limited investigations. The result obtained in this study indicates that the use of gadget can delay the children speaking ability, especially children aged 3-4 years.
Co-Authors A.A. Ketut Agung Cahyawan W Adelia, Ismi Ardiana, Amalia Chairunnisa Chairunnisa Hasan, Asmira Irdoni HS Irdoni Irdoni Jatikta Yuni Harti, Jatikta Yuni M Farid M. Farid, M. Mappapoleonro, A Musda Mayub, Afrizal Mayub, Aprizal Padang Hamid Pembeu, Merlin Pratiwi, Revika Julia Sabahannur, St Sri Wulan, Sri Tarsono Zainal Zainal