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All Journal POSITRON Jurnal Ilmiah Aplikasi Isotop Radiasi Journal of Mathematical and Fundamental Sciences Gravitasi Omega: Jurnal Fisika dan Pendidikan Fisika Jurnal Fisika FLUX Panrita Abdi - Jurnal Pengabdian pada Masyarakat Journal of Dentomaxillofacial Science Indonesian Journal of Chemistry Indonesian Physical Review Makara Journal of Science Jurnal Elektronika dan Telekomunikasi
Dahlang Tahir
Department Of Physics, Hasanuddin University, Makassar 90245
Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Education Energy Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mathematics Physics Other

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PELATIHAN PEMBUATAN PAPAN IKLAN DOT-MATRIKS BERBASIS MIKROKONTROLER DI SMKN 1 WAJO A. Arifin; Ida Laila; Muqoil Darussalam; Nurlindah Hamrun; Dahlang Tahir; Syamsir Dewang
Panrita Abdi - Jurnal Pengabdian pada Masyarakat Vol. 5 No. 3 (2021): Jurnal Panrita Abdi - Juli 2021
Publisher : LP2M Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/pa.v5i3.11254

Abstract

Technological development in the manufacture of microcontroller-based dot-matrix billboards carried out in the form of counseling and training for students at Wajo 1 State Vocational High School (SMK). The implementation of this training aims to increase the insight, knowledge, and skills of vocational school students, which are an educational level that must have different knowledge from the level of education in general. The method of implementing this activity includes site observation, preparation, counseling, and provision of materials related to physics and energy, entrepreneurship, optoelectronic technology, as well as the implementation of training on making Arduino microcontroller-based dot-matrix billboards and evaluating the training implementation. The result of this activity is an increase in the knowledge and insight of students in terms of making a series of dot-matrix billboards using electronic components, understanding program code, running the Arduino Integrated Development Environment (IDE) program, conducting simulations on circuits using the Arduino microcontroller and students have successfully demonstrated and run the running text panel that was created using an Android smartphone. --- Pengembangan teknologi dalam pembuatan papan iklan dot-matriks berbasis mikrokontroler yang dilakukan dalam bentuk penyuluhan dan pelatihan kepada siswa-siswi di Sekolah Menengah Kejuruan (SMK) Negeri 1 Wajo . Pelaksanaan pelatihan ini bertujuan untuk meningkatkan wawasan, pengetahuan dan keterampilan siswa-siswi SMK yang merupakan tingkat pendidikan yang harus memiliki pengetahuan yang berbeda dari tingkat pendidikan pada umumnya. Metode pelaksanaan kegiatan ini meliputi peninjauan lokasi, persiapan, penyuluhan dan pemberian materi terkait fisika dan energi, kewirausahaan, teknologi opto-elektronika, serta pelaksanaan pelatihan pembuatan papan iklan dot-matriks berbasis mikrokontroler arduino dan evaluasi pelaksanaan pelatihan. Hasil dari kegiatan ini adalah adanya peningkatkan pengetahuan serta wawasan siswa dalam hal pembuatan rangkaian papan iklan dot-matriks menggunakan komponen elektronika, memahami kode program, menjalankan program arduino Integrated Developement Environment (IDE), melakukan simulasi pada rangkaian menggunakan mikrokontroler arduino serta siswa telah berhasil mendemonstrasikan dan menjalankan panel running text yang telah dibuat dengan menggunakan smartphone android.  
Band Alignment and Optical Properties of (ZrO2)0.66(HfO2)0.34 Gate Dielectrics Thin Films on p-Si (100) Dahlang Tahir; Hee Jae Kang; Sven Tougaard
Journal of Mathematical and Fundamental Sciences Vol. 43 No. 3 (2011)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2011.43.3.5

Abstract

(ZrO2)0.66(HfO2)0.34 dielectric films on p-Si (100) were grown by atomic layer deposition method, for which the conduction band offsets, valence band offsets and band gaps were obtained by using X-ray photoelectron spectroscopy and reflection electron energy loss spectroscopy. The band gap, valence and conduction band offset values for (ZrO2)0.66(HfO2)0.34 dielectric thin film, grown on Si substrate were about 5.34, 2.35 and 1.87 eV respectively. This band alignment was similar to that of ZrO2. In addition, the dielectric function (k, ω), index of refraction n and the extinction coefficient k for the (ZrO2)0.66(HfO2)0.34 thin films were obtained from a quantitative analysis of REELS data by comparison to detailed dielectric response model calculations using the QUEELS-ε (k,ω)-REELS software package. These optical properties are similar with ZrO2 dielectric thin films.
Effect of Chlorine Plasma Treatment on Electronic Properties of GIZO Thin Film Grown on SiO2/Si Substrate Dahlang Tahir; Suhk Kun Oh; Hee Jae Kang; Sung Heo; Jae Gwan Chung; Jae Cheol Lee
Journal of Mathematical and Fundamental Sciences Vol. 45 No. 3 (2013)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2013.45.3.1

Abstract

The effect of chlorine plasma treatment on electronic properties of GIZO grown on SiO2/Si by RF magnetron sputtering was investigated using X-ray photoelectron spectroscopy (XPS), reflection electron energy loss spectroscopy (REELS), and secondary ion mass spectroscopy (SIMS). SIMS depth profiles indicated that the concentration of InO and ZnO on the surface was decreased after Cl2 plasma treatment. REELS data showed that the band gap increased from 3.4 to 3.7 eV. XPS showed that Ind5/2 and Zn2p3/2 shifted to the higher binding energies by 0.5 eV and 0.3 eV, respectively. These phenomena were caused by oxygen deficiency and hydrocarbon contamination reduction as indicated by Cl atom bonding with In and Zn cations that are present on the surface after Cl2 plasma treatment.
Physical characteristics test (water content and viscosity) of extraction sodium alginate brown algae (phaeophyta) species padina sp. as basic material for production dental impression material Nurlindah Hamrun; Bahruddin Thalib; Dahlang Tahir; Syaharuddin Kasim; Ahmad F. Nugraha
Journal of Dentomaxillofacial Science Vol. 3 No. 2 (2018): (Available online: 1 August 2018)
Publisher : DiscoverSys Inc.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15562/jdmfs.v3i2.625

Abstract

Objective: This research aims to explore the potential of brown algae species padina sp. as a dental impression material by examining the physical characteristics of the sodium alginate extraction of brown algae species padina sp.Material and Methods: This research is a quasi-experimental with one-shot case study design. Samples are brown algae species padina sp. from Punaga and Puntondo beach in South Sulawesi. Brown algae species padina sp. is extracted to obtain sodium alginate and further tested for physical characteristics including viscosity test and water content.Results: The extraction of brown algae species padina sp. resulted in 250 grams (25%) of brown powdered sodium alginate that smelled fishy. Physical characteristic tests revealed the water content of sodium alginate species from brown algae padina sp. was 8%. This result is acceptable for sodium alginate water content as set by the Food Chemical Codex that requires less than 15% water content. The measurement of the viscosity obtained is 13.33 cps.Conclusion: These results indicate that the species of brown algae padina sp. has the potential to be one of the basic materials of dental impression material.
Assisted Surface-state Recombination of Orange-peel Carbon Nanodots in Various Matrices Fatimah, Siti; Isnaeni, Isnaeni; Tahir, Dahlang
Makara Journal of Science Vol. 22, No. 1
Publisher : UI Scholars Hub

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

Abstract

The contentious origin of the luminescence of carbon nanodots (CDs) has attracted considerable attention. In this work, we synthesized CDs from orange peel by using a microwave-assisted technique. We investigated the optical properties of the synthesized CDs. Moreover, we studied the effect of matrix addition on the optical properties of CDs. We found that matrix addition significantly influences the absorbance and photoluminescence of CDs. Shifts in absorbance peak intensity and emission peak wavelength indicated that the bonding of matrix molecules on the surfaces of the CDs has changed the structures of CDs. This finding is supported by the extended half-life of CDs after matrix addition. Our results will expand researchon the use of CDs as phosphorescent materials.
Studi Quality Control (QC) Pesawat Fluoroscopy (Angiografi) di PT. Siloam Internasional Hospital Makassar menggunakan Multimeter RaySafe (X2) dan Black Piranha RTI Aswad Aswad; Bualkar Abdullah; Dahlang Tahir
POSITRON Vol 8, No 2 (2018): November Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (927.751 KB) | DOI: 10.26418/positron.v8i2.24752

Abstract

Tujuan dari penelitian ini adalah melakukan uji quality control (QC) pada pesawat fluoroscopy (angiografi) di PT. Siloam Internasional Hospital Makassar, pengukuran didasarkan pada protokol QC yang dikembangkan oleh Radiological Council Western Australia. Pengukuran yang dilakukan meliputi akurasi tegangan tabung (kVp), waktu fluoroskopik maksimum, dan uji kualitas berkas/half value layer (HVL), linearitas keluaran (mGy/mAs), laju dosis permukaan II, dan kualitas citra. Hasil penelitian menunjukkan bahwa pengujian generator dan tabung pesawat sinar-x masih dalam batas toleransi yaitu 1,4%. Nilai maksimum laju dosis pasien tipikal 14,3 mGy/min, dan laju dosis serap reseptor citra sebesar 67,8 mGy/min untuk pengukuran menggunakan 20 cm phantom polymethyl methacrylate (PMMA) yang dioperasikan pada mode dosis normal dan dosis tinggi.
Sintesis dan Karakterisasi Fotoluminisens Carbon Dots Berbahan Dasar Organik dan Limbah Organik Siti Fatimah; Isnaeni Isnaeni; Dahlang Tahir
POSITRON Vol 7, No 2 (2017)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (890.218 KB) | DOI: 10.26418/positron.v7i2.22660

Abstract

Bahan dan limbah organik dapat disintesis menjadi CDs dengan metode green synthesis berbasis microwave assisted. Bahan organik yang digunakan adalah sawi, kentang, biji jagung dan limbah jagung (kulit dan tongkol jagung). Karakterisasi fotoluminisens (PL) digunakan untuk menunjukkan sifat optik CDs. Hasil karakterisasi PL dari CDs berbahan dasar bahan dan limbah organik menunjukkan panjang gelombang yang relatif sama yaitu 500 nm. Perbedaan CDs bahan dan limbah organik yaitu pada intensitas pendaran CDs. CDs biji jagung memiliki intensitas pendaran yang tinggi dibandingkan CDs yang berasal dari bahan organik lainya yaitu 42 a.u.. Sedangkan untuk limbah jagung memiliki panjang gelombang dan intensitas yang relatif sama. Besarnya energi gap yang dihasilkan dari CDs dari bahan organik berada disekitaran 2,46 eV, dimana berada pada rentang energi gap CDs. Hal ini menunjukkan bahwa bahan dan limbah organik dapat disintesis menjadi CDs dengan efektif, efisien, ekonomis dan ramah lingkungan.
Effect of Sintering Temperature on the Microstructure Behavior of Gelcasted Porous Ceramics Using Cassava Starch as Pore Template Suriati Eka Putri; Diana Eka Pratiwi; Rachmat Triandi Tjahjanto; Nita Magfirah Ilyas; Dahlang Tahir; Abd Rahman; Heryanto Heryanto
Indonesian Journal of Chemistry Vol 23, No 5 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.78875

Abstract

The gelcasting technique was employed to fabricate porous ceramics utilizing kaolinite clay as the base material with a combination of 20 wt.% cassava starch. The utilization of cassava starch as a pore-template material is a sustainable and eco-friendly approach. The dry mixture compacted pellets underwent calcination for 2 h at three distinct sintering temperatures, namely 900, 1000, and 1100 °C. The present study investigated the impact of sintering temperatures on various ceramic properties, including but not limited to porosity, hardness, crystallinity, lattice strain, and morphology. Furthermore, an increase in sintering temperature led to a reduction in crystallinity of the ceramic material from 81.71 to 78.06%, while the lattice strain increased, as determined by the full width at half maximum peak diffraction calculation. The study determined that the pore size remained microporous (21 Å) across all temperature treatments. Ultimately, a porous ceramic material was fabricated, exhibiting a porosity of 39.44% by volume and a desirable hardness of 94 HB. The optimal sintering temperature for this material was found to be 900 °C. The anticipated application of the porous ceramic, which has taken on a pellet shape, is as a catalyst support for wastewater filtration in the future.
BAND ALIGNMENT OF ULTRATHIN GIZO/SiO2/Si HETEROSTRUCTURE DETERMINED BY ELECTRON SPECTROSCOPY Tahir, Dahlang; Ilyas, Sri Dewi Astuty; Kang, Hee Jae
Makara Journal of Science Vol. 15, No. 2
Publisher : UI Scholars Hub

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

Abstract

Amorphous GaInZnO (GIZO) thin films are grown on SiO2/Si substrate by the RF magnetron sputtering method. By the combination of measured band gaps from reflection energy loss spectroscopy (REELS) spectra and valence band from X-ray photo-electron spectroscopy (XPS) spectra, we have demonstrated the energy band alignment of GIZO thin films. The band gap values are 3.2 eV, 3.2 eV, 3.4eV and 3.6eV for the concentration ratios of Ga: In: Zn in GIZO thin films are 1:1:1, 2:2:1, 3:2:1 and 4:2:1, respectively. These are attributed to the larger band gap energy of Ga2O3 compared with In2O3 and ZnO. The valence band offsets (ΔEv) decrease from 2.18 to 1.68 eV with increasing amount of Ga in GIZO thin films for GIZO1 to GIZO4, respectively. These experimental values of band gap and valence band offset will provide the further understanding in the fundamental properties of GIZO/SiO2/Si heterostructure, which will be useful in the design, modeling and analysis of the performance devices applications
THE EFFECT OF ADDITIONAL IRON SAND ON THE CRYSTAL SIZE AND STRAIN OF ZnO Lorna, Lorna; Mutmainna, Inayatul; Tahir, Dahlang; Gareso, Paulus L
Indonesian Physical Review Vol. 5 No. 3 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i3.178

Abstract

This study observed the effect of the addition of iron (Fe) doping on the characteristics of Zinc Oxide (ZnO) nanoparticles.Zn(1-x)Fe(x) with various concentration of x = 0, 2, 4, 6, 8, and 10% was prepared by coprecipitation method using Sodium Hydroxide and Hydrogen Chloride. The effect of adding Fe doping on ZnO was characterized using X-ray Diffraction (XRD) to determine the crystal structure, size, and strain. The analysis result confirmed the absence of additional impurity peaks in the ZnO nanoparticles. Fe doping affects the Zn lattice structure. X-ray diffraction (XRD) study confirms the crystalline Hexagonal structure. Crystal size analysis using Debye Scherrer, UDM, and Halder-Wagner method obtained varying crystal sizes with variations in the concentration of Fe ranging from 19.89-44.72 nm. The crystal size and strain obtained from the Debye Scherrer method are smaller
Co-Authors A'yun, Arini Qurrata A. Arifin Abd Rahman Abdullah, Bualkar Ahmad F. Nugraha Ali Umar Dani Arsita sita Aswad Aswad Bahruddin Thalib Bayu Aditya Nugraha Chairil Anwar Chairil Anwar Destalina, Destalina Diana Eka Pratiwi Erlyta Septa Rosa Erlyta Septa Rosa Eunike Dwioknain Eunike Dwioknain Fitriani Fitriani Gareso, Paulus L Gareso, Paulus Lobo Hamsi, Taufik Hardianti Adam Hardianti Hardianti Hee Jae Kang Hee Jae Kang Hee Jae Kang Hee Jae Kang Hendri Hendri Heryanto Haeruddin Heryanto Heryanto Heryanto Heryanto Ida Laila Ilyas, Sri Dewi Astuty Inayatul Mutmainna, Inayatul Isnaeni Isnaeni Isnaeni Isnaeni Isnaeni Isnaeni Isnaeni Jae Cheol Lee Jae Gwan Chung Jojo Hidayat Jojo Hidayat Jojo Hidayat June Mellawati Lorna, Lorna Mujtahid, Fitriah Muqoil Darussalam Natalita Maulani Nursam Nita Magfirah Ilyas Nugraha, Bayu Aditya Nurlaela Rauf Nurlindah Hamrun Nursam, Natalita Maulani Nurul Fajri R Tang Putri, Radha Hartina R Pradana Rachmat Triandi Tjahjanto Ramlan, Nurul Mutmainnah Roni Rahmat Shobih Shobih Shobih Shobih Shobih Shobih Siti Fatimah Siti Fatimah Siti Fatimah Sri Dewi Astuty Ilyas Suhk Kun Oh Sung Heo Suriati Eka Putri Sven Tougaard Syaharuddin Kasim Syamsir Dewang Syamsul Arifin Vika Sri Anti Zaky Mubarak Zaky Mubarak, Zaky