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All Journal International Journal of Electrical and Computer Engineering Bulletin of Electrical Engineering and Informatics Jurnal Ilmiah Teknik Elektro Komputer dan Informatika (JITEKI) Jurnal Penelitian Pendidikan IPA (JPPIPA) Makara Journal of Technology
Retno Wigajatri Purnamaningsih
Universitas Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Journal : Makara Journal of Technology

 1 
Improved Optical Probe for Measuring Phytoplankton Suspension Concentrations Based on Optical Fluoresensce and Absorption Purnamaningsih, Retno Wigajatri; Prihantini, Nining Betawati
Makara Journal of Technology Vol. 16, No. 2
Publisher : UI Scholars Hub

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Abstract

This paper discusses the results of improved optical probe that works according to optical fluorescence and absorption phenomena for measuring the phytoplankton suspension concentrations. Measurements are made on the Scenedesmus sp. culture. The laboratory test has shown that range of concentration from 104 up to around 1 x 106 cells/mL; fluorescence intensity at λ = 685 nm; and logarithmic of transmission intensity at λ = 405 nm are proportional to the cell concentration linear with proportional constant γ = 4 × 10-5 and β = –2 × 10-7 mL/cell respectively.
Design of GaN-Based Low-Loss Y-Branch Power Splitter Purnamaningsih, Retno Wigajatri; Saraswati, Irma; Poespawati, Nji Raden; Dogheche, Elhadj
Makara Journal of Technology Vol. 18, No. 3
Publisher : UI Scholars Hub

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Abstract

We present a Y-branch power splitter design with a multimode section using GaN on Sapphire at telecommunication wavelength. The GaN sample optical properties were also investigated, resulting in a refractive index for the GaN layers nTE=2.289±0.001 and nTM=2.324±0.00. Optimization of the structure parameters for this structure was conducted accurately using BPM methods. The results demonstrated the possibility of realizing a GaN-based Y-branch power splitter for various applications.
Co-Authors Andrianto Handojo Dimitris Pavlidis, Dimitris Dini Andiani Dini Andiani, Dini Dini Marhaeni Elecevani Elhadj Dogeche, Elhadj Elhadj Dogheche Elhadj Dogheche Hendrik Kurniawan Irma Saraswati Junivan Sulistianto Luh Putu Ratna Sundari Nauval Franata NB Prihantini Nibras Yayienda Nji Raden Poespawati Nyi Raden Poespawati Nyi Raden Poespawati, Nyi Prihantini, Nining Betawati Rizqy Pratama Rahman Tomy Abuzairi