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All Journal Jurnal Riset dan Kajian Pendidikan Fisika Jurnal Matematika & Sains JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI Social, Humanities, and Educational Studies (SHEs): Conference Series Budapest International Research and Critics Institute-Journal (BIRCI-Journal): Humanities and Social Sciences
Harjana Harjana
Jurusan Fisika FMIPA Universitas Sebelas Maret (UNS)
Religion Arts Humanities Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Languange, Linguistic, Communication & Media Mathematics Physics Social Sciences

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Electrical Characteristics and Annealing Effect on Al/n-GaSb Schottky Diode Doped Using DMTe Ari Handono Ramelan; Harjana Harjana; Pepen Arifin; Ewa Goldys
Jurnal Matematika & Sains Vol 15, No 3 (2010)
Publisher : Institut Teknologi Bandung

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

Abstract

The electrical properties of Al/n-GaSb Schottky diodes, doped with 1.4 × 1018 cm−3 (tellurium) were examined.  C-V (capacitance-voltage) measurements at 300 K show barrier heights of 0.63 eV, compared to 0.59 eV determined from room temperature I-V (current-voltage)  measurements. The voltage and frequency dependence on the capacitance is due to the ideality factor of the Schottky barrier and due to a high series resistance.  At low frequency the measured capacitance is dominated by the depletion capacitance of the Al/n-GaSb Schottky diode which is bias-dependent and frequency-dependent. The diode shows a strong temperature dependence of ideality factor from approximately 3.6 at room temperature to as high as 6.7 at 140 K.  There may be a small portion of the device nonideality attributable to generation-recombination currents due to deep levels in GaSb. The barrier height decreased from 0.57 eV to 0.35 eV for the sample annealed at 300oC for 1 minute.
Profil Pembelajaran Suhu dan Kalor di SMA Se-Kabupaten Keerom Budiarti, Indah Slamet; Suparmi, Suparmi; Cari, Cari; Sarwanto, Sarwanto; Harjana, Harjana
Jurnal Riset dan Kajian Pendidikan Fisika Vol 4, No 1 (2017): April 2017
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (407.341 KB) | DOI: 10.12928/jrkpf.v4i1.6466

Abstract

Pembelajaran melibatkan tiga aspek yaitu kognitif, psikomotor, dan afektif. Penelitiaan ini bertujuan untuk mendeskripsikan pembelajaran suhu dan kalor di SMA se-Kabupaten Keerom. Penelitian ini merupakan penelitian deskriptif . Sampel diambil menggunakan teknik purposive random sampling, yang terdiri dari tiga SMA di Kabupaten Keerom. Data diperoleh melalui pengamatan di kelas dan wawancara secara mendalam pada guru yang mengajar pada materi suhu dan kalor. Berdasarkan data dan analisis, hasil penelitian ini menunjukan bahwa pembelajaran suhu dan kalor di SMA se kabupaten Keerom belum sesuai dengan hakekat pembelajaran sains dimana tidak semua guru menerapkan model pembelajaran berbasis pada siswa. Hanya satu SMA yang menggunakan model pembelajaran yang berbasis pada siswa yaitu menggunakan model pembelajaran kooperatif dengan metode demostrasi, walaupun masih terdapat kelemahan pada proses pembelajarannya yaitu hanya beberapa siswa yang aktif dalam pembelajaran. Learning involves three aspects: cognitive, psychomotor, and affective. This research aims to describe the learning of the subject: temperature and heat in the Keerom regency high school. This research is a descriptive research. The sample was taken using purposive random sampling technique, which consisted of three High Schools in Keerom Regency. Data were obtained through in-class observation and in-depth interviews on teachers who taught on temperature and heat subject. Based on the data and analysis, the results of this study shows that learning temperature and heat in high school in Keerom regency is not in accordance with the nature of science learning where not all teachers apply learning models based on students. Only one high school using a learning model based on students is using cooperative learning model with demonstration method, although there is still a weakness in the learning process that is only some students who are active in learning.
Development of Three-Tier Diagnostics Instruments on Students Misconception Test in Fluid Concept Irwansyah, Irwansyah; Sukarmin, Sukarmin; Harjana, Harjana
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 7, No 2 (2018): Jurnal Ilmiah pendidikan Fisika Al-Biruni
Publisher : UIN Raden Intan Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (374.148 KB) | DOI: 10.24042/jipfalbiruni.v7i2.2703

Abstract

The purpose of this research was to know the validity and reliability of instrument three-tier diagnosis to identify the students’ misconception in fluid concept. The stages of development research that used in this research were (1) The first research and collecting information, (2) planning and designing of development (3) validity and product evaluation. The instrument of the test was tested on 98 students of 3 schools. The instrument has been developed and categorized effectively because it has a valid category with the Aiken validity index value> from table V (0.75) and the reliability of the instrument has a value of 0.96 with a high category. The instrument of three-tier test that developed was able to identify the students comprehension in students concept and students misconception. There are 27,58% students comprehend the concept, 45,29% students did not comprehend the concept, 24,74% students showed that misconception and 2,36% students experienced errors
Drought Risk Reduction Efforts in The Village of Krendowahono Gondangrejo Karanganyar Using Geolistric Surveys Sorja Koesuma; Budi Legowo; Darsono Darsono; Iwan Yahya; Harjana Harjana
Social, Humanities, and Educational Studies (SHEs): Conference Series Vol 3, No 1 (2020): Social, Humanities, and Educational Studies (SHEs): Conference Series
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (334.828 KB) | DOI: 10.20961/shes.v3i1.45014

Abstract

Krendowahono, Gondangrejo, Karanganyar regency is located in the north of Surakarta city which is in 2019 the most affected area of drought. During August 2019 to November 2019, the village needs 2 to 5 water tanks dropping per day with a capacity of 5000 liters per tank. With such drought conditions, the villages government should provide clean water for their citizens. The method used for determining groundwater aquifers is the Geoelectric Method. This method works by injecting an electric current into the ground surface, then measuring the potential difference. Based on the obtained resistivity value, it can be interpreted at what depth there are groundwater aquifers. At the geoelectric survey location in Krendowahono village, it was found that the groundwater aquifer might be in layer 5 at a depth of 92.3 meters below, but the groundwater potential at this layer was not huge enough. Potential aquifers are likely to be from a depth of 92.3 meters to 110-120 meters. 
Analysis of Critical Thinking Skills of Senior High School Department of Mipa on Biological Materials with Environmental Socio-Scientific Issues (ESSI) Alpahmi Aji Satria; Sulistyo Saputro; Sutarno Sutarno; Harjana Harjana
Budapest International Research and Critics Institute-Journal (BIRCI-Journal) Vol 5, No 3 (2022): Budapest International Research and Critics Institute August
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birci.v5i3.6723

Abstract

This study aims to describe the critical thinking skills of students of class X MIPA SMA Negeri 1 Tiga Dihaji, SMA Negeri 1 Buay Sandang Aji, and SMA Negeri 2 Muaradua. This type of research is descriptive research with a qualitative approach. This research was carried out in class X Mathematics and Natural Sciences (N=124) students by working on the Essay test instrument for critical thinking skills on Environmental Socio-Scientific Issues (ESSI)-based biology material. The results showed that students' critical thinking skills were still very lacking, namely in the interpretation aspect 44.95% with very poor criteria, analysis aspect 40.12% with very poor criteria, 49.79% evaluation with very poor criteria, and 40.72% inference aspect with very poor criteria.
Co-Authors Alpahmi Aji Satria Ari Handono Ramelan Budi Legowo Budi Legowo Budiarti, Indah Slamet Cari, Cari Darsono Darsono Darsono Darsono Ewa Goldys Holyness Nurdin Singadimedja Irwansyah Irwansyah Iwan Yahya Iwan Yahya Koesuma, Sorja Pepen Arifin Sarwanto, Sarwanto Sorja Koesuma Sukarmin Sulistyo Saputro Suparmi, Suparmi