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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS Agrotekma: Jurnal Agroteknologi dan Ilmu Pertanian JET (Journal of English Teaching) Adi Buana
Kurniawan, Yohanes
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Agriculture, Biological Sciences & Forestry Astronomy Education Energy Materials Science & Nanotechnology Physics

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Karakterisasi Muatan Nanopartikel Silika (SiO2) dengan Metode Elektroforesis Santoso, Purwoko Haryadi; Kurniawan, Yohanes; Pamungkas, Havid Noor; Suparno, Suparno
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 11, No 1 (2021): IJAP Volume 11 ISSUE 01 YEAR 2021
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v11i1.48326

Abstract

Electrophoresis is one of the experimental methods employed in this study to characterize unique properties of charges of silica nanoparticles (SiO2) by observing their electrophoretic phenomena while they are situated in the electric field. This study is aimed to measure one of the SiO2 properties, namely the charge, using electrophoresis method through the variation of electric fields. The charge dependencies of SiO2 was probed towards five times variation of electric fields 1000, 1250, 1500, 1750, and 2000 V/m in 20 mL of aquades. The displacement of SiO2 could be observed through the light microscope with 160x magnification which the recorded observations then were analyzed by timeline-based software to measure the displacement time of particles during the observation. The results revealed that silica nanoparticles have the kind of positive charges in the colloidal solution. It is caused the magnitude of SiO2 charges is ranged constantly despite the variational effect of electric field in the environment. Light microscope has been optimized in this study to measure the velocity of SiO2 that tends to increase with respect to the magnifying electric fields given in the experiment.
Aplikasi Beberapa Jenis Dan Dosis Mikroorganisme Lokal Limbah Tomat Dan Sayuran Dalam Meningkatkan Pertumbuhan Dan Hasil Tanaman Cabai (Capsicum Annum L.) Panjaitan, Fany Juliarti; Lele, Onesimus Ke; Taopan, Rizki Adiputra; Kurniawan, Yohanes
Agrotekma: Jurnal Agroteknologi dan Ilmu Pertanian Vol 5, No 1 (2020): Agrotekma: Jurnal Agroteknologi dan Ilmu Pertanian, Desember
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/agr.v5i1.4479

Abstract

Go organic in 2010 is a program launched by the government to produce organic agricultural products. The organic red chili plant is one of the products of the go organic program in 2010 which has high economic value, so it is necessary to increase the red chili plant the productivity. The use of local microorganisms can be used as an alternative in producing organic chili products. This study aims to determine the effect of type and dose of the best local microorganism on the growth and yield of chili. The study used a factorial randomized block design consisting of two factors. The first factor was local microorganisms (P) type consisting of 3 levels: P1(vegetables), P2(tomatoes), and P3(vegetables and tomatoes), the second factor was local microorganisms (D) dose consisting of 5 levels: D0: 0 cc/L of water, D1: 25 cc/L, D2: 50 cc/L, D3: 75 cc/L, D4: 100 cc/L. The results showed that P3D1 is the best treatment in increasing plant height, flowers number and accelerating 80% flowering age. Treatment of MOL P1 type and 25 cc/L dose is the best treatment in increasing the chili plants diameter. P3D4 is the best treatment in increasing the chilies wet weight per plant.
Reciprocal Technique to Improve the Novice Learners’ Speaking Proficiency Utama, Yoga Alif Kurnia; Kurniawan, Yohanes
JET ADI BUANA Vol 3 No 1 (2018)
Publisher : English Education Department, Faculty of Teacher Training and Education, Universitas PGRI Adi Buana Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36456/jet.v3.n1.2018.1545

Abstract

Speaking proficiency becomes a priority in leaning foreign language. However, preliminary observation done showed that speaking skill was not the objective in most English classes. It was also found that the students were passive. By applying Research and Development design of Pimsleur‟s reciprocal technique, this study aims to improve the novice learners‟ speaking proficiency. After applying design of Pimsleur‟s reciprocal technique, there are some results. Based on the analysis, it can be concluded that the Indonesian adaptation of Pimsleur‟s method is an appropriate media to teach transactional conversation to low level students. The results show that the simple real situations based audio content is suitable and useful to the students‟ need. The principles used also ease the students to acquire, store, recall, practice, and communicate in English, as the target language, correctly. And the participants give positive responses to the use of the Indonesian adaptation of Pimsleur‟s method
Co-Authors Havid Noor Pamungkas, Havid Noor Onesimus Ke Lele Panjaitan, Fany Juliarti Purwoko Haryadi Santoso Rizki Adiputra Taopan Suparno Suparno Yoga Alif Kurnia Utama, Yoga Alif Kurnia