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All Journal Linguistica Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Yohana Siregar
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Arts Humanities Engineering Languange, Linguistic, Communication & Media

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Pre-Treatment Jerami Padi Menggunakan Proses Organosolv Dengan Variasi Konsentrasi Pelarut (CH3OH) Dan Waktu Pemasakan Siregar, Yohana; Yenie, Elvi; Daud, Syarfi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Rice straw is one of  agricultural waste products which has not to be used in huge area. Rice straw is usually used for some purposes, such as roofs and fodder. Biomass or rice straw is composed of three main components, namely cellulose (34.2%), hemicellulose (24.5%) and lignin (23.4%). Delignification aims to separate lignin from other compounds contained in the biomass by using an organic solvent which is methanol.  Due to this solvent is easier to obtain, more friendly to enviroment, and the solvent could be recovered back. Lignin contained in rice straw could potentially be used as a source of alternative materials in various industries, the one is adhesive industry. The aims of this research are to study the effect of the concentration of solvent and cooking time to the achieve the lignin. The study was conducted with a cooking time of  60; 120; and 180 minutes, the concentration of methanol 65; 75; 85; and 95 % w/w. The process steps in this research include size reduction by using mixing, cooking (delignification) using methanol, then washing and filtering stages. In this research, the lignin yield best at 13.6 % which was obtained at cooking time of 120 minutes with 65 % methanol concentration and the lignin content of 20.5 % w/w. Lignin was analyzed functional groups with the Fourier Transform Infra Red spectroscopy (FTIR ) .  Keywords: Cooking, Delignification, Fourier Transform Infra Red spectroscopy (FTIR), Lignin, Organosolv, Rice Straw
POLITENESS STRATEGIES USED BY TOBA BATAK SELLERS IN SAMOSIR Yohana Siregar; Rahmah Rahmah
LINGUISTICA Vol 3, No 4 (2014)
Publisher : State University of Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jalu.v3i4.1810

Abstract

ABSTRACT   This study deals with politeness strategies used by toba batak sellers in Samosir. The objectives of this study were (1) to describe the types of  politeness strategies were used by Toba Batak sellers in Samosir, (2) to investigate the type of politeness strategy was mostly used describe the reasons, (3) to describethe roles of politeness to Toba Batak society, and (4) to describe the implication of politeness strategies. The data of this study were the language of conversation between Toba Batak sellers and their buyers. This study applied descriptive quantitative method. The findings show that there are four types of Politeness Strategies used by Toba Batak Sellers in Samosir, namely: Bald on record4 utterances (2.53%), Off record17 utterances (10.75%), Positivepoliteness 129 utterances (81.64%) and Negativepoliteness 8 utterances (5.06%). Positivepoliteness is the most dominant type of Politeness Strategies used by Toba Batak sellers in Samosir. Keyword        :Politeness Strategies, Toba Batak Sellers, Samosir.
Co-Authors Elvi Yenie, Elvi Maemonah, Maemonah Syarfi Daud