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All Journal International Journal of Renewable Energy Development Jurnal Bahasa dan Sastra Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Jurnal Ilmiah Mahasiswa FEB Jurnal Fisika Unand Jurnal Riset Kimia GEA, Jurnal Pendidikan Geografi Indonesian Journal of Chemistry Akta Kimia Indonesia Eksakta : Berkala Ilmiah Bidang MIPA Molekul: Jurnal Ilmiah Kimia Reviu Akuntansi dan Bisnis Indonesia Jurasik (Jurnal Riset Sistem Informasi dan Teknik Informatika) SPRINTER: Jurnal Ilmu Olahraga Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Tarbiyah Wa Ta'lim: Jurnal Penelitian Pendidikan dan Pembelajaran Dirasatul Ibtidaiyah Proceeding of Undergraduate Conference on Literature, Linguistic, and Cultural Studies International Journal of Renewable Energy Development Jurnal Kimia Unand
Yulia Eka Putri, Yulia Eka
Jurusan Kimia, FMIPA, Universitas Andalas
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INFLUENCE GIVING RICE BRAN IMMERSION AT CHICKEN MANURE MEDIA ON THE ABUNDANCE Daphnia magna Putri, Yulia Eka; Pamukas, Niken Ayu; Hasibuan, Saberina
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

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Abstract

The research was conducted on 1-15 May 2015 in Environment QualityAquaculture Laboratory. The purpose of this research to know the influence ofrice bran immersion at chicken manure media on the abundance Daphnia magna.The method of research used experimental method with Completely RandomizedDesign (RAL) with five treatments and three replication. The treatments withgiving rice bran immersion at chicken manure media: rice bran control (0 ml/L),D1 (3 ml/L), D2 (5 ml/L), D3 (7 ml/L), D4 (9 ml/L). The result shown rice brangave the highest abundance population of Daphnia magna and best giving is 3ml/L rice bran immersion with top average abundance 569 ind/L.Key word: Daphnia magna, rice bran immersion, chicken manure, abundance
STUDI HANTARAN LISTRIK SENYAWA SRN+1TINO3N+1 (N = 1 DAN 2) FASA RUDDLESDEN-POPPER YANG DISINTESIS DENGAN METODE LELEHAN GARAM Putri, Yulia Eka; Yusri, Hamsal; -, Zulhadjri
Jurnal Riset Kimia Vol 8, No 2 (2015): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v8i2.237

Abstract

Srn+1TinO3n+1 (n = 1, 2,...n)Ruddlesden-Popper phase is a metal oxide compound with a layered structure consisting of SrTiO3 perovskite layers and strontium oxide (SrO) layers, thus this material has a potential as termoeletrik compounds that could be developed as an alternative material for renewable energy. In this study, we examine one of the 3 parameters of termoelectric properties, namely the electrical conductivity. Srn+1TinO3n+1 (n = 1 and 2)Ruddlesden-Popper phases were synthesized using molten salt method. The synthesis was carried out at 950 °C for 10 hours with a ratio of precursor and salt were 1: 0.5. Structural analysis by X-Ray Diffractometer (XRD) confirmed that all synthesized compounds formed Srn+1TinO3n+1 (n = 1, and 2) Ruddlesden-Popper phase with the characteristic peaks at 2q = 31o, 32o, and 46o. The morphology analysis by Scanning Electron Microscope (SEM) showed that the particles have plate-shaped with crystallites size were 20 nm. The electrical properties were measured using LCR meter with the highest electrical conductivity of 2.25x10-7 S / cm which showed the semiconductors behaviour.
POTRET KEHIDUPAN BUNDO KANDUANG DI MINANGKABAU DALAM NOVEL LIMPAPEH KARYA A.R. RIZAL Putri, Revitra Yulia Eka; Juita, Novia; Zulfadhli, Zulfadhli
Jurnal Bahasa dan Sastra Vol 5, No 2 (2018): SERI D
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/896110

Abstract

The purposes of this study to describe the description of the life of bundo kanduang in Minangkabau in Limpapeh's novel by A.R. Rizal is seen from the properties, duties and responsibilities, as well as the role of the bundo kanduang in Limpapeh's novel by A.R. Rizal. This research type is qualitative research by using descriptive method. Based on the results of research and discussion can be concluded that a bundo kanduang must be a role model in life so it must have some properties, such as true, clever, articulate, and has the nature of shame. Furthermore, in the life of a bundo kanduang must perform duties and obligations, such as manuruik alua nan luruih, manampuah nan pasa, mamaliharo harato jo pusako, and mamaliharo child and nephew. Then in his life, a bundo kanduang has two roles: the role of domestic (in the family) and the public role (according to the profession and position).Keywords: bundo kanduang, Minangkabau, Limpapeh
Sintesis Codoped-Sr2TiO4 Fasa Ruddlesden-Popper dengan Metoda Lelehan Garam dan Sifat Hantaran Listriknya Mulia, Elan; Sabrina, Ayu; Aprianti, Dila Kartika; Andriani, Nova; Zulhadjri, Zulhadjri; Putri, Yulia Eka
Jurnal Riset Kimia Vol 11, No 2 (2020): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v11i2.358

Abstract

In this research, undoped-Sr2TiO4 and codoped-Sr2TiO4 Ruddlesden-Popper (RP) phase compounds have been synthesized with mole variations of Sr:Ti and dopants. Double substitution with Sm3+ for Sr2+ sites and Nb5+ for Ti4+ sites forming Sr2-xSmxTi1-yNbyO4 (x = 0.0125; 0.025; 0.05; 0.1 and y = 0.0125) aimed to increase the number of electrons carrier, so that the electrical conductivity enhanced. The XRD patterns showed that the highest purity of prepared Sr2TiO4 RP phase sample was obtained at the mole ratio of Sr:Ti of 2:1 with specific peaks at 2θ: 31.35°, 46.73°, and 57.33°. Then, this mole ratio was used to prepare the codoped-samples, and the XRD patterns showed the Sr1.95Sm0.05Ti0.9875Nb0.0125O4 sample has the highest purity. SEM images showed that the undoped-Sr2TiO4 and codoped-Sr2TiO4 samples have a plate-like particles with micrometer size. The electrical conductivity of Sr1.95Sm0.05Ti0.9875Nb0.0125O4 sample was measured to be a 17-fold increase compared to that of undoped-Sr2TiO4 sample. 
Production of Starch-Based Bioplastic from Durio zibethinus Murr Seed Using Glycerol as Plasticizer Jannah, Nanda Raudhatil; Jamarun, Novesar; Putri, Yulia Eka
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.398

Abstract

Bioplastics are bio-based plastics from natural resources, made to replace conventional plastics. The utilization of biopolymers in bioplastics provide a faster degradation compared to petroleum-based plastics. Starch-based bioplastic from mixing Durio zibethinus Murr starch and glycerol as plasticizer have been conducted. In this research, the concentration of glycerol has been varied to study the effect on starch-based bioplastics mechanical properties. The tensile strength for Durio zibethinus Murr starch-based bioplastic with 20% glycerol was 50.28 MPa with 13.3% elongation. The functional group found on the Fourier transform infrared spectroscopy (FTIR) spectra indicated the presence of O-H stretch, C-H stretch, C=O stretch, and C-O stretch which stated the formation of bioplastic. The image results gained from scanning electron microscope (SEM) showed that the morphology surface of bioplastic was less homogenous and rough. The soil burial test for biodegradability showed Durio zibethinus Murr starch-based bioplastic achieved 38.9% weight loss in a 5-day observation.
PENGARUH MANAJEMEN LABA SEBELUM INITIAL PUBLIC OFFERINGS (IPO) TERHADAP KINERJA KEUANGAN PERUSAHAAN (Studi Empiris pada Perusahaan yang Terdaftar di Bursa Efek Indonesia) Yulia Anindhyta Eka Putri
Jurnal Ilmiah Mahasiswa FEB Vol 5, No 2: Semester Genap 2016/2017
Publisher : Fakultas Ekonomi dan Bisnis Universitas Brawijaya

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Abstract

Penelitian ini dilakukan untuk menguji pengaruh manajemen laba sebelum IPO terhadap kinerja keuangan perusahaan setelah IPO. Objek penelitian ini adalah perusahaan yang melakukan IPO di Bursa Efek Indonesia (BEI) periode tahun 2011 sampai dengan tahun 2015, dengan syarat bukan termasuk dalam jenis perusahaan yang bergerak di bidang industri properti, real estate, keuangan dan jasa keuangan. Penentuan sampel pada penelitian ini menggunakan metode purposive sampling dan mendapatkan sampel penelitian sebanyak 41 perusahaan. Metode Jones Modifikasian dipilih sebagai proksi perhitungan tingkat akrual diskresioner dalam praktik manajemen laba. Pengujian dalam penelitian ini dilakukan dengan menggunakan teknik analisis regresi sederhana.  Hasil penelitian menemukan bahwa manajemen laba yang dilakukan perusahaan sebelum IPO berpengaruh negatif terhadap kinerja keuangan perusahaan setelah IPO.Kata kunci : IPO, manajemen laba, kinerja keuangan
SrTiO3 Nanokubus: Sintesis, Kontrol Morfologi dan Sifat Termoelektrik (Tinjauan) Yulia Eka Putri; Ratesha Najela; Nova Andriani; Diana Vanda Wellia
Akta Kimia Indonesia Vol 6, No 1 (2021)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25493736.v6i1.9167

Abstract

Thermoelectrics (TE), enabling the conversion of heat energy into electricity directly, provide the opportunity as alternative energy for conventional power generator with high efficiency. To date, bulk SrTiO3 nanocubes is the most promising oxide-based TE materials candidate. The nanoarchitecture of 3-dimensional SrTiO3 nanocubes (3D-STO) is the main target in realizing high performance TE materials with high ZT value comparable to commercially available telluride-based compound. The proper synthesis method is needed to form SrTiO3 with uniform nano-sized cubic particles. Liquid synthesis technique namely hydrothermal and solvothermal, succeeded in forming 20 nm of SrTiO3 nanocubes with high crystallinity and homogeneous morphology
Morphology-Controlled Synthesis Of SrTiO3 Nanocube By Capping Agent-Assisted Solvothermal Method Yulia Eka Putri; Alvionita Alvionita; Rini Rahma Yanti; Diana Vanda Wellia
Molekul Vol 11, No 1 (2016)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (295.473 KB) | DOI: 10.20884/1.jm.2016.11.1.191

Abstract

The synthesis of SrTiO3 nanocubes have been carried out by solvothermal process using cetyl trimethyl ammonium bromide (CTAB) as capping agent to control the particles morphology. The condition of the synthesis was obtained at 160 ºC for 24 hours with molar ratio of SrTiO3 and capping agent was 1 : 1. The X-ray diffraction (XRD) pattern shows that SrTiO3 adopts a perovskite structure with a higher intensity of 110 at 2q:32.33º and the crystallite size calculated from FWHM was found to be 41 nm. Fourier transform infrared (FTIR) spectrum shows a shift in particular absorption band attributed the interaction between SrTiO3 particles surface and the head group of CTAB molecules. Transmission electron microscopy (TEM) image shows the cubic-like particles of SrTiO3, this indicatesthat CTAB successfully functions as capping agent on the synthesis of SrTiO3.
Fabrication of Superhydrophobic Film on the Surface of Indonesian Bamboo Timber by TiO2 Deposition and Using Octadecyltrichlorosilane as a Surface Modifier Agent Diana Vanda Wellia; Wulandari Wulandari; Arifah Mustaqimah; Nurul Pratiwi; Yulia Eka Putri
Indonesian Journal of Chemistry Vol 20, No 4 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (699.075 KB) | DOI: 10.22146/ijc.46740

Abstract

The tropical bamboo has been widely used in modern society as a potential material for various applications. It is well known that bamboo has low durability due to its hydrophilic properties. To overcome this problem, the superhydrophobic surface on Indonesian bamboo timber had been successfully fabricated via hydrothermal deposition of an anatase TiO2 and solution immersion of octadecyltrichlorosilane (ODTS), which exhibited a maximum water contact angle (WCA) of 155°. The as-fabricated superhydrophobic bamboo timber not only showed high mechanical resistance against the abrasion of SiC sandpaper but had also been proven to possess high chemical stability after immersion in acidic and basic aqueous solutions. Moreover, the superhydrophobic bamboo timber also demonstrated excellent self-cleaning and flame-resistance properties, in comparison to pure bamboo timber. It is believed that the strategy offered in this study can increase the utilization of bamboo timber for various purposes, especially as a self-cleaning material.
Synthesis of Graphene Oxide Enriched Natural Kaolinite Clay and Its Application For Biodiesel Production Syukri Syukri; Fadhil Ferdian; Yetria Rilda; Yulia Eka Putri; Mai Efdi; Upita Septiani
International Journal of Renewable Energy Development Vol 10, No 2 (2021): May 2021
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2021.32915

Abstract

A heterogeneous catalyst is one type of catalyst which is very effective for biodiesel production; thus, in this study, a novel heterogeneous bifunctional catalyst was prepared by kaolinite clay obtained from Padang of West Sumatera and impregnated with graphene oxide and potassium hydroxide (KOH) for the simultaneous esterification and transesterification reactions of palm oil into biodiesel. For comparison, two other catalysts were also prepared. The first catalyst was the same clay which was heated at 450ºC for 4 hours, and the second catalyst was the same clay which was impregnated with potassium hydroxide (KOH) only. The three catalysts were characterized using X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), and Fourier Transform Infra-Red (FTIR). XRF analysis showed that the clay sample’s main composition consisted of 54% silica, 35% alumina, and 7% hematite. The XRD analysis results showed that the most dominant crystal composition was quartz, kaolinite, and hematite. The analysis results using FTIR showed a change in intensity and shift in wave numbers indicating a cation exchange. The catalytic activity test was carried out with a ratio of oil and methanol 1:6, catalyst amount 5%, 60ºC reaction temperature, and 4 hours of reaction time.The results showed that the catalytic activity of clays impregnated with graphene oxide and potassium hydroxide was better with a yield of 58% compared to clays without impregnation and other clays that were only impregnated with KOH under the yields of 0.8% and 0.4%, respectively
Co-Authors Admi Admi Alvionita Alvionita AMINUDIN, RIZKI Amir, Firmanul Qadri Amsah Hendri Doni Andriani, Nova Aprianti, Dila Kartika Ardawi Sumarno Arifah Mustaqimah Astri Ayu Irawan Cholisa, Keyshe Nur Emil Salim Fadhil Ferdian Famella Azhara Firmanul Qadri Amir Frisca Aulanny Geliz Luh Titisari Harahap, Asriana Ilham Maulana Saud, Ilham Maulana Irfan Zinat Achmad Linusia Marsih Lulu Amellia Musyaffa Mai Efdi Mai Efdi Matlal Fajri Alif Melvi Muharmi Mesy Rino Nindia Muhammad Alfi Muldarisnur, Mulda Mulia, Elan Niken Ayu Pamukas Nindia, Mesy Rino Nova Andriani Novesar Jamarun Novia Juita Novita, Marlia Nursyaidah, Nursyaidah Nurul Pratiwi Rahmayeni Rahmayeni Ratesha Najela Rini Rahma Yanti Ruslan Abdul Gani Saberina Hasibuan Sabrina, Ayu Safitri, Adek Salindeho, Arnetta Ayu Carolina Salmiati Salmiati, Salmiati Salsabilla, Annisya Shelvira Edelwita Simbolon, Ali Mustopa Yakub Siregar, Fitri Rayani Sri Mulya Syafrizayanti Syafrizayanti Syukri - Syukri Syukri Tio Putra Wendari Upita Septiani utami, Anggun dwi Utami, Geby Riyanti Wellia, Diana Vanda Wulandari Wulandari Yeni Stiadi Yetria Rilda Yuliani, Putri Yundari, Yundari Yusri, Hamsal Zulfadhli Zulfadhli Zulhadjri Zulhadjri