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All Journal Komunikasi Fisika Indonesia Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Jurnal Online Mahasiswa (JOM) Bidang Pertanian Spektra: Jurnal Fisika dan Aplikasinya APTEK
Rahmi Dewi
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mathematics Physics

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Uji Biofungisida Pelet Berbahan Dasar Pelepah Kelapa Sawit Yang Mengandung Isolat Trichoderma spp. Terhadap Jamur Ganoderma boninense Pat. Secara In Vitro Roy Ibrahim; Yetti Elfina; Rahmi Dewi
Jurnal Online Mahasiswa (JOM) Bidang Pertanian Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Pertanian

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Abstract

Basal stem rot (BSR) disease caused by Ganoderma spp.. The most of solution is using chemical pesticides and it was hazardous to environment and human health. The other way is using biological agent Trichoderma spp. in the form of biofungicide pellet. The aims of this research was to know the best influence of biofungicide pellet in controlling pathogen G. boninense of oil palm plant by in vitro. This research was done at Plant Pathology Laboratory of Agriculture Faculty and Nanotechnology Material Laboratory of Mathematics and Natural Science Faculty, University of Riau from May until July 2013. Experimental study was conducted using completly randomized design with 5 treatment and 4 replications. The treatment were application of biofungicide pellet is T0= Without isolate Trichoderma spp., T1= biofungicide pellet T. pseudokoningii, T2= biofungicide pellet T. koningii, T3= biofungicide pellet T. harzianum, T4= biofungicide pellet T. viride). Data obtained from the observations were statistically analyzed using analysis of variance, followed by Duncan's New Multiple Range Test (DNMRT). The result showed that biofungicide pellet containing isolate of Trichoderma spp. showing the different of patogen G. boninense by in vitro. Biofungicide pellet of T. harzianum has the higher result arround 58,84% and spores arround 16,47 x 106 than T. pseudokoningii, T. koningii and T. viride. Keyword: Palm Midrib, Isolat Trichoderma Spp, Mushrooms
THE DETERMINATION OF BARIUM STRONTIUM TITANATE THIN FILM BAND GAP ENERGY Ba0,15Sr0,85TiO3 USING ULTRAVIOLET-VISIBLE SPECTROSCOPY Rahmi Dewi; Krisman Krisman; Zulkarnaen Zulkarnaen; Rahmi Afrida Syahraini; TS Luqman Husein
Spektra: Jurnal Fisika dan Aplikasinya Vol 5 No 1 (2020): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 5 Issue 1, April 2020
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (453.693 KB) | DOI: 10.21009/SPEKTRA.051.02

Abstract

A thin layer of Barium Strontium Titanate Ba0.15Sr0.85TiO3 (BST) was developed on a glass substrate using a sol-gel method with annealing temperatures and spin coating process at 3500 rpm for 30 seconds. The annealing temperature varied from 600oC, 650oC, and 700oC. Characterization of optical properties was developed using UV-Vis spectroscopy to determine the energy bandgap. The values of the BST thin layer energy band at the annealing temperature were 3.55 eV, 3.32 eV, and 3.10 eV, respectively. The results indicate that the BST thin film was a semiconductor material.
INTERPRETASI AKUIFER DANGKAL DAN DALAM DENGAN MENGGUNAKAN METODE INVERS SMOOTHNESS-CONSTRAINT LEAST SQUARES DATA GEOLISTRIK KONFIGURASI SCHLUMBERGER DI PLTU TENAYAN RAYA Aji Susoso; M Juandi; Rahmi Dewi; Usman Malik
Aptek Jurnal Apliksai Teknologi (APTEK): Volume 11, No. 02, Juli 2019
Publisher : Fakultas Teknik Universitas Pasir Pengaraian

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (400.126 KB) | DOI: 10.30606/aptek.v11i2.56

Abstract

Research of The Interpretation of shallow and deep aquifer by using inversion methods Smoothness-Constraint Least Squares Geoelectric Data Configuration Schlumberger At Tenayan Raya electric steam power Plan has been successfully done and get result. The study was conducted with the aim to analyze and know the potential of shallow and deep aquifer reserve in the area of Tenayan Raya electric steam power Plan. One way to find out the groundwater resources is by exploring using the Schlumberger geoelectric configuration method. This geoelectric method is used to find out the condition of groundwater presence in the location of Tenayan Raya electric steam power Plan with more accurate result. The deep aquifer (water carrier) obtained with the schlumberger geolistrik and then modeled with the Smoothness-Constraint Least Squares Inversion Method which has a smaller error rate. Measurements are made on three (3) stretches in The location of Tenayan Raya electric steam power Plan. The results obtained on the measurement shows the amount of groundwater potential at the location of Tenayan Raya electric steam power Plan at a depth ranging from 17 to 130 m for shallow aquifer Ana 240 m upward for a deep aquifer. The amount of water reserve in the area of Tenayan Raya electric steam power Plan until the depth is 11.300.000 m3 for shallow aquifer Ana for deep aquifer in The Mount of 11.000.000 m3. Keywords : Aquifer, Inversion, Smoothness, Geoelectric, Schlumberger
Co-Authors Aji Susoso Defrianto Defrianto Fauzan ' Hafnida Hasni Harahap Handri Anjoko Krisman ' Krisman Krisman Krisman Krisman M Juandi Pipit Rahayu P Rahmad Efendi Rahmi Afrida Syahraini Roy Ibrahim Satri Siswanto Syahrol ' TS Luqman Husein Usman Malik Vira Marselly Yetti Elfina Zuhdi ' Zulkarnaen Zulkarnaen