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Effect of Growth Temperature and Mn Incorporation on GaN:Mn Thin Films Grown by Plasma-Assisted MOCVD Budi Mulyanti; A. Subagio; F. S. Arsyad; P. Arifin; M. Barmawi; Irzaman Irzaman; Z. Jamal; U. Hashim
Journal of Mathematical and Fundamental Sciences Vol. 40 No. 2 (2008)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2008.40.2.1

Abstract

In this paper, the growth of GaN:Mn thin films by plasma-assisted metalorganic chemical vapor deposition (PAMOCVD) method is reported. The method used in this study, utilizes a microwave cavity as a cracking cell to produce nitrogen radicals, which in turn reduce the growth temperature. Trimethylgallium (TMGa), nitrogen (N2) and cyclopentadienyl manganese tricarbonyl (CpMnT) were used as a source of Ga, N and Mn, respectively, while hydrogen gas was used as a carrier gas for both TMGa and CpMnT. The effect of growth temperature and Mn incorporation on structural properties and surface morphology of GaN:Mn films are presented. The growth of GaN:Mn thin films were conducted at varied growth temperature in range of 625 oC to 700 oC and the Mn/Ga molar fraction in the range of 0.2 to 0.5. Energy dispersive of X-ray (EDX) and X-ray diffraction (XRD) methods were used to analyze atomic composition and crystal structure of the grown films, respectively. The surface morphology was then characterized using both atomic force microscopy (AFM) and scanning electron microscopy (SEM) images. A systematic XRD analysis reveal that maximum Mn incorporation that still produces single phase GaN:Mn (0002) is 6.4 % and 3.2 % for the film grown at 650 oC and 700 oC, respectively. The lattice constant and full width at half maximum (FWHM) of the single phase films depend on the Mn concentration. The decrease in lattice constant accompanied by the increase in FWHM is due to incorporation of substitutional Mn on the Ga sub-lattice. The maximum values of doped Mn atoms incorporated in the wurtzite structure of GaN:Mn as substitutional atoms on Ga sub-lattice are 2.0 % and 2.5 % at 650 oC and 700 oC, respectively. AFM and SEM images show that the film grown at lower growth temperature and Mn concentration has a better surface than that of film grown at higher growth temperature and Mn concentration.
PENGARUH VARIASI FREKUENSI, BEBAN DAN TEGANGAN TERHADAP GELOMBANG KOTAK PADA DESAIN SENSOR KAPASITANSI Erna Rusliana Muhamad Saleh; Irzaman Irzaman; Zulaeha Ma’bud
Prosiding Semnastek PROSIDING SEMNASTEK 2014
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Tujuan  penelitian  ini  adalah  melihat  pengaruh  variasi  frekuensi,  beban  dan  tegangan  terhadapoutput  gelombang  kotak  yang  dihasilkan  pada  rangkaian  sensor  kapasitansi  .  Pada  penelitian  inibeban R3 dan R5 dimodelkan seri dengan variasi yang berbeda 10 dan 56 Kohm,  tegangan diubahubah dari 0, 5 dan 10 Volt, dan frekuensi input bervariasi 1 Hz dan 50 Hz. Hasil terbaik diperolehsaat beban 56 Kohm, frekuensi  50 Hz dan tegangan 0 volt dan 5 volt.  Sedangkan pada beban 10Kohm, frekuensi 50 Hz dan tegangan 10 volt, output yang dihasilkan adalah gelombang sin bukangelombang kotak.
Analisis Teknis dan Ekonomis Penerapan Lampu Penerangan Jalan Umum Panel Surya di Kota Sukabumi Dion Sanaha; Irzaman Irzaman; Sri Mulatsih
Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Vol. 10 No. 1 (2020): Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan
Publisher : Graduate School Bogor Agricultural University (SPs IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jpsl.10.1.77-88

Abstract

Abstract. Public Street Light (PSL) with Solar Cell Power has good prospects to be developed in the equator. PSL design must provide reliable service. The aims of this research are to know how the design of PSL with Solar Cell Power can provide a reliable service of The PSL. Besides that, monitoring of the performance of PSL is expected to be carried out centrally, this is to facilitate employees in observing the performance of the lights, also to anticipate damage PSL components. The design of PSL are expected to meet these expectations. This PSL designed can provide data on the performance of the main components of the PSL with Solar Cell Power, namely: Solar Cell, Batteries and LEDs. Economic analysis is taken into account of the design of this PSL. Net Present Value (NPV) are used in analyzing the Smart Design of PSL, which is by adding up all cash flow and investment costs.
Sifat Optik Lithium Tantalat (Litao3) Diatas Substrat Silikon (100) Tipe-P Bervariasi Suhu Agus Ismangil; Irmansyah Irmansyah; Irzaman Irzaman
KOMPUTASI Vol 14, No 1 (2017): Komputasi: Jurnal Ilmiah Ilmu Komputer dan Matematika
Publisher : Ilmu Komputer, FMIPA, Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (162.587 KB) | DOI: 10.33751/komputasi.v14i1.263

Abstract

Lithium tantalit, yang memiliki rumus kimia LiTaO3, film tipis telah tumbuh pada tipe-p Si substrat (100) dengan menggunakan deposisi larutan kimia dan teknik spin coating pada kecepatan 3000 rpm selama 30 detik. film tipis LiTaO3 dibuat konsentrasi 2,5 juta dan pada suhu anil 550 C, 600 C, 650 C, 700 C, 750 C, dan 800 C. Ini film tipis yang ditandai dengan menggunakan spektroskopi laut optik dan LCR meter. Hasil penelitian menunjukkan bahwa serapan puncak tertinggi film LiTaO3 adalah pada suhu 800 C dengan panjang gelombang di atas 800 nm. Hal ini menunjukkan bahwa film LiTaO3 adalah bahan semikonduktor.
INTERNET OF THINGS: AUTOMATIC PLANT WATERING SYSTEM USING ANDROID Ridwan Siskandar; Muhammad A Fadhil; Billi Rifa Kusumah; Irmansyah Irmansyah; Irzaman Irzaman
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 9, No 4 (2020): Desember 2020
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v9i4.297-310

Abstract

Internet of Things (IoT) is a system that connects devices directly or indirectly to the internet. The device can work with remote control. One application of the IoT system on the watering system is able to provide an approach to the ease in the process of growth and development of plants. The research carried out was applied to an IoT-based smart plant watering device. The tool is supported with a soil moisture measuring sensor that acts as a benchmark to determine the condition of soil moisture and automatic control of the process of watering plants. The process of watering plants is scheduled in the morning and evening. Information, as long as the device is run will be displayed on the LCD and screen of an Android-based smartphone application. The data can be a comparison value to determine the suitability of soil moisture data in plants. The volume of water supplied in the watering process also affects the level of soil moisture. IoT-based smart plant sprinklers can automate watering by measuring the percentage of soil moisture as a benchmark for providing water during the watering process. Remote watering control can also be done on this tool by using a WiFi signal to the same access point that is connected to the smartphone client and microcontroller. Keyword: agriculture, automatic sprinklers, engineering, IoT
PENERAPAN REKAYASA MESIN SORTIR SEBAGAI PENENTU KEMATANGAN BUAH JERUK DAN TOMAT MERAH BERBASIS IMAGE PROCESSING Ridwan Siskandar; Noer A Indrawan; Billi Rifa Kusumah; Sesar Husen Santosa; Irmansyah Irmansyah; Irzaman Irzaman
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 9, No 3 (2020): September 2020
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v9i3.222-236

Abstract

The embedded systems in the industrial, especially image processing, is increasingly leading to the study of production automation systems such as fruit sorting. Post-harvest sorting system implemented by the industry is manual, so it’s not effective. The solution was to conduct research aimed at modifying post-harvest sorting tools by engineering tomato and orange sorting machines based on their color. The method uses image processing. It’s the most efficient alternative in terms of cost and complexity of hardware design, does not require many sensors, but produces an accurate output. The camera is placed on the mechanical sorting machine system, taking images to determine the sorting execution after the fruit color type are recognized. The results of the research were carried out through several tests, namely: light intensity, color image data, and organoleptics. Light intensity test showed that the position of the tool had a value of 0.78% of the outside light disturbance. Color image shows the range of ripeness values (R/G) for raw tomatoes 0<=1.04; half ripe tomatoes 1.04<=1.39; ripe tomatoes 1.39<=3.59; raw orange 0<=0.92; undercooked oranges 0.92<=0.98; and ripe oranges 0.98<=1.66. Organoleptic test from five observers had the same results as the reading on the fruit sorting tool. Keywords : engineering, fruit maturity, oranges, sorting machines, tomatoes
Structural and Electrical Properties of Silica Materials from Rice Husks Casnan; Purnawan; Erliza Noor; Hartrisari Hardjomidjojo; Irzaman; Eti Rohaeti; Aditya Kurniawan
ASEAN Journal on Science and Technology for Development Vol. 38 No. 2 (2021): Repurpose & Redefine
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.697

Abstract

This study aimed to analyze the structural and electrical properties of silica from rice husks recovered by the process of ashing on a medium-scale furnace with a capacity of 15 kg. Rice husks were burned at a heating rate of 1.5°C/min to a temperature of 900°C, where the temperature was retained for 1 hour each at 400°C and 900°C. The methodology of this research was conducted through the process of ashing, extraction of silica, and characterization of its structural electrical properties. The silica extracted from rice husk ash had a relatively low water content by the low absorption intensity of the group –OH at 3610 cm-1. The silica was dominated more by the siloxane group (Si-O-Si) compared with the silanol group (Si-OH). Based on XRD analysis, the silica structure was confirmed as tetragonal. The silica also had a decreased resistance, impedance, and inductance as the frequency increased. These results indicate that the obstacles contained in silica content decrease with an increase in frequency. The decreasing of dielectric constants was caused by the frequency affecting the capacitance; i.e., increased frequency caused more waves to be transmitted each second. The electric current was turned before the capacitor plate was fully charged, which caused quick charge drainage in the capacitor plate and therefore reduced the ability of a material to store the electric charge.
STUDI KONDUKTIVITAS ELEKTROLIT POLIMER KITOSAN/PVA+KOH R.Putri -; A.Maddu -; Irzaman -
Sistem Informasi Vol 1 No 2 (2011): Jurnal Photon
Publisher : LPPM Universitas Muhammadiyah Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jp.v1i2.108

Abstract

The blend-based polymer electrolyte consisting of chitosan and polyvinyl alcohol (PVA) as host polymers and potassium hydroxide (KOH) as the complexing salt was studied. Polymerelectrolyte were obtained by the casting technique. An attempt was also made to investigate the effect of TiO2 concentration in the chitosan/PVA+KOH polymer electrolyte. The best ionic conductivity values of 1,105 x 10-2 S cm-1 at room temperature were obtained for the sample containing 35%wt of KOH and 1,210 x 10-2 S cm-1 for the sample containing 50% wt TiO2. The polymer electrolyte with good ionic conductivity properties were characterized by thermal analysis (DSC). The glass transition temperature about 75.30 °C for the optimum Chitosan/PVA+KOH
KARAKTERISASI ELEKTROLIT POLIMER OPTIMUM KITOSAN/PVA+KOH R.Putri -; A.Maddu -; Irzaman -
Sistem Informasi Vol 1 No 2 (2011): Jurnal Photon
Publisher : LPPM Universitas Muhammadiyah Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37859/jp.v1i2.115

Abstract

The blend-based polymer electrolyte comprising of chitosan and polyvinyl alcohol (PVA) as host polymers and potassium hydroxide (KOH) 35% wt as the complexing salt was studied. Polymer electrolyte were obtained by the casting technique. FTIR, XRD, SEM and EDX studies have been made to investigate the structural, complexation in film morphology of the polymer electrolyte.
ETHOGRAM PERILAKU ALAMI INDIVIDU TIKUS SAWAH (Rattus argentiventer Robinson and Kloss, 1916) DALAM LABORATORIUM Agus Wahyana Anggara; Dedy Duryadi Solihin; Wasmen Manalu; Irzaman Irzaman
ZOO INDONESIA Vol 24, No 2 (2015): Desember 2015
Publisher : Masyarakat Zoologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52508/zi.v24i2.739

Abstract

Perilaku merupakan respons senso-motorik makhluk hidup terhadap beragam stimulus dan fluktuasi kondisi lingkungan. Pengamatan terhadap perilaku alami tikus sawah telah dilakukan pada kondisi laboratorium. Tikus sawah tersebut ditangkap dari lapangan. Penelitian bertujuan untuk mengungkapkan dan mendeskripsikan perilaku alami tikus sawah. Semua aktivitas tikus percobaan dipantau kamera CCTV dan dilakukan pengamatan saksama untuk membuat ethogram. Hasil pengamatan menunjukkan bahwa aktivitas normal tikus sawah sepanjang periode aktifnya pada malam hari meliputi perilaku keluar-masuk lubang sarang, mengendus, mengawasi, menjelajah, makan dan minum, merawat diri, istirahat, dan menggali tanah. Sebagian besar aktivitas dilakukan pada pukul 17:30-22:00 WIB sehingga dapat dinyatakan bahwa periode tersebut merupakan waktu puncak aktivitas tikus sawah. Hasil percobaan diharapkan dapat menjadi standar perilaku alami tikus sawah untuk dibandingkan dengan respons tikus uji ketika dipaparkan kembali vokalisasi alaminya. Vokalisasi yang memberikan perbedaan respon perilaku tikus dianggap sebagai suara
Co-Authors -, A.Maddu -, R.Putri . Irmansyah . Masitoh . Mursyidah . Sucipto A M Fauzi A Maddu A. Ardian A. Maddu A. Subagio A. Subagio A.D. Husin A.Maddu - Abdul Djamil Husin Abdurahman Abdurrahman Abu Sonip Abu Sonip Ade Irma Ade Kurniawan Ade Kurniawan Ade Kurniawan Ade Kurniawan Ade Kurniawan Ade Kurniawan Adi, Langit Cahya Aditya Kurniawan Adnan Prasetyo Alamsyah Adrian Fadhillah Agnes Tiara Vinanda Agus Ismangil Agus Wahyana Anggara Agus Wahyana Anggara Agus Wahyana Anggara, Agus Wahyana Ahmad Khairul Reza Ahmad Yani Akhiruddin Akhiruddin Akhiruddin Maddu Aldi Destia Lesmana Alfi Afriliani Alif Musthafa Thariq Aljon Albertus Manotar Simbolon, Aljon Albertus Manotar Aminullah Aminullah Aminullah Aminullah Ana Fitriana Ana Fitriana Angga Khalifah Tsauqi Angga Khalifah Tsauqi Anis Munir Rukyati Anissa Tsalsabila Annisa Tsalsabila Antomi Saregar Ardian Arif Ari Firia Ari Setiawan ARI SETIAWAN Astri Wahyuningtyas Azka Zakiyyatuddin B. Sastri Baba Barus Bambang H. Trisasongko Bambang H. Trisasongko Bambang Herawan Bambang Herawan, Bambang Billi Rifa Kusumah Boedi Tjahjono Budi Harsono Budi Mulyanti Casnan, Casnan D Puspita Dea Amelia Saputri Demijati Demijati Dendy Handy Saputra Dendy Handy Saputra Dendy Handy Saputra Dendy Handy Saputra Desna Desna Deti Anggraeni Ekawati Dion Sanaha Dwi Lestariningsih Dwiky Agung Adi Nugroho Dyah R Panuju Dyah R. Panuju Dyah R. Panuju E. Ridwan E. Supriyanto Edy Sarwono Ella Rahmadani Endah Kinarya Palupi Erawan Kurniadi Erfiani Erfiani Erliza Hambali Erliza Noor Erna Rusliana Muhamad Saleh Erni Apriliana Erni Aprilina Erni Aprilina Eti Rohaeti Eti Roharti Eva Musyafaah Evvy Kartini F Nawafi F. Huriawati F. S. Arsyad Fadhilah Chandra Fajrul Kamil Ramadhan Fanny Amalia Farida Huriawati, Farida Firmansyah Firmansyah Fitrah Hadi Firdaus Fitrah Hadi Firdaus Fitrah Hadi Firdaus Fitrah Hadi Firdaus, Fitrah Hadi Fitri Melinda Gagat Mughni Pradipta Gagat Mughni Pradipta Gagat Mughni Pradipta Gagat Mughni Pradipta H Syafutra H. Darmasetiawan H. Darmasetiawan H. Darmasetiawan H. DarmasetiawanArifin H. Hardhienata H. Sutanto H. Syafutra H. Syafutra Hadjomidjojo, Hartrisari Halimah Sa'diyah Hanedi Darmasetiawan Hannif Izzatul Islam Hannif Izzatul Islam Hannif Izzatul Islam Hannif Izzatul Islam Hari Wijayanto Hari Wijayanto Hartrisari Hadjomidjojo Hartrisari Hardjomidjojo Heriyanto Safutra Heriyanto Syafutra Herlan Darmawan Herlan Darmawan Hermawan Prasetya dan Taufik Djatna Hilal Fauzi Ramadhan Husin Alatas Imam Suyanto Indriyati Rahmi Setyani Ira Ukhtianingsih Ira Ukhtiningsih Ira Ukhtiningsih, Ira Irlian Nurmaniah Irlian Nurmaniah Irlian Nurmaniah Irlian Nurmaniah, Irlian Irmansyah . Irmansyah Irmansyah Irmansyah Irmansyah Irmansyah Irmansyah Irwan Meilano Irwan Meilano Ismangil, Agus Ivander Manuel Jajang Juansah Jenie, Renan Prasta Johan Iskandar Johan Iskandar Johansah Liman Kamelia Fikriah Khafit Pratama Hendratno Khusnul Yakin Koharudin Koharudin L. Nady La Isa Leni Ariyanti Lulu Lutfiah Lusia Anita Boru Sagala Lusia Anita Br. Sagala Lusia Anita Br. Sagala M. Barmawi M. Barmawi M. Barmawi M. Budiman M. Budiman M. Hikam M. Hikam M. Hikam M. Hikam M. N. Indro M.A. Idris Mahmud A. Raimadoya Mahmud A. Raimadoya Maria Evita Maria Evita Maya Risanti Maya Risanti Maya Risanti Maya Risanti, Maya Mersi Kurniati Meutia Awani Mitra Djamal Mitra Djamal Mochamad Iqbal Moh Yasin Mohammad Yasin Muhamad Syazali, Muhamad Muhamad Yani, Muhamad Muhammad A Fadhil Muhammad Ahyad Muhammad Fikri Fakhrurozi Muhammad Hikam Muhammad Hikam Muhammad Khalid Murtezha Hadijaya N. G. Pamungkas Nada Huwaidah Nadia Septiani Naufal Muharram Nurdin Nazopatul Patonah Har Nida Nabilah Nida Nabilah Nida Nabilah Nida Nabilah Nina Siti Aminah Nina Siti Aminah Noer A Indrawan Nora Idiawati Novitri Novitri P. Arifin P. Arifin P. Arifin P. Arifin P. Arifin P. Perdinan P. W. K. Anggraini Palupi, Endah Kinarya Purnawan Purnawan Putra, Heriansyah Putri Tarigan R Erviansyah R. D. Puspita R. Erviansyah R. Erviansyah R. Putri R.Putri - Raden Silfia Epriyanti Rahmad Junaidi, Rahmad Ratih Dwi Septiani Retna Apsari Retno Dwi Jayanti Retno Dwi Kartika Sari Riani Eka Fitri Ridwan Siskandar Rizki Nurhikmah Rohul Rizki Mubaroq Hartman Royyan Faizin S. Taking S.N. Jusoh Salahuddin Perdana Salamet Nur Himawan Sarah Aribah Miftahulfallah Sarah Nabilah Sejahtera Sejahtera Sensius Seno Sesar Husen Santosa Shelvie Nidya Neiman Sidikrubadi Sidikrubadi Sigit Ahmad Fatoni Sinta Puspita Apriliani Siregar, Rahmat Nawi Siswadi Siswadi Siti Aisyah Sofyan Sa'id Atsaurry Sofyan Sa'id Atsaurry Sofyan Said Sofyan Said Atsaurri Sri Mulatsih Stefiana Sondary Az Zahrah Sukirno Sukirno Sumarjono Effendy Supandi Supandi Suryanto, Wiwit Susi Susilawati T. Sumardi Talitha Alya Syaharani Tantan Taopik Ramlan Tantan Taopik Ramlan, Tantan Taopik Tantan Taopik Rohman TARUNI SRI PRAWAST MIEN KAOMINI ANY ARYANI DEDY DURYADI SOLIHIN Teguh Yogaraksa Tetinia Gulo Titin Yuliana Touwil Umrih Tun Tedja I U. Hashim Umam, Rofiqul Umi Trimukti Venas Miftah Hasan Wahyu Srigutomo Wahyu Srigutomo Wahyudi Wahyudi Wahyudi Wahyudi Wahyudianto, Benny Wasmen Manalu Widya Rahma Witri Desmulyani Yulia Christina Yulia Sani Yulia Sani Yulia Sani, Yulia Z. Jamal Z. Jamal Zahra Syahira Zulaeha Ma’bud