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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

Author-ID : 444489

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

Published : 24 Documents Claim Missing Document

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Analysis Optical Properties of Carbon Dots from Paper Flowers (Bougainvillea spectabilis) Ramlan, Nurul Mutmainnah; A'yun, Arini Qurrata; Putri, Radha Hartina; Fatimah, Siti; Isnaeni, .; Tahir, Dahlang
Omega: Jurnal Fisika dan Pendidikan Fisika Vol 4 No 2 (2018)
Publisher : Program Studi Pendidikan Fisika UHAMKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31758/OmegaJPhysPhysEduc.v4i2.30

Synthesized carbon dots (CDs) from paper flowers (Bougainvillea spectabilis) was performed by microwave assisted. CDs were characterized by ultraviolet visible light (UV-Vis), photoluminescence (PL) and time resolved luminescence (TRPL). PL data shows wavelength intensity of CDs paper flowers at 493 nm for 3.9 ns and 512 nm for 4.2 ns respectively for purple and white paper flowers that excited at 420 nm. The absorbance for CDs white paper flower at 262 nm and 350 nm, while CDs purple flower paper at 260 nm, 324 nm, and 530 nm. CDs from paper flower shows excellent optical properties. So, it is mean that method applied to this experiment effectively, cheap and eco-friendly for synthesis CDs from paper flower.

Evaluasi Tingkat Kebisingan Pada SMK Darussalam Makassar: (Evaluation of Noise Level at SMK Darussalam Makassar) Hamsi, Taufik; Rauf, Nurlaela; Tahir, Dahlang
Gravitasi Vol. 20 No. 1 (2021):
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/gravitasi.v20i1.15526

Penelitian mengenai tingkat kebisingan di SMK Darussalam Makassar menggunakan alat sound level meter. Tingkat kebisingan di ukur di 5 titik. Pada penelitian ini aspek yang dianalisis adalah tingkat polusi bising dan hubungannya dengan jumlah kendaraan yang melintas di depan sekolah. Secara umum kebisingan di SMK Darussalam Makassar berada pada level dapat di terima sampai tidak dapat di terima dengan nilai berkisar 54,6 dB â€“ 88,1 dB. Semakin kedalam letak titik pengukuran kebisingan di SMK Darussalam, maka semakin rendah pula tingkat kebisingan yang terjadi.

Radon (222Rn) Radioactivity Level at the BATAN Workplace using RAD7 Arsita sita; Dahlang Tahir; June Mellawati; R Pradana
Jurnal Ilmiah Aplikasi Isotop dan Radiasi Vol 16, No 2 (2020): Desember 2020
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jair.2020.16.2.6000

Measurement of Radon (222Rn) radioactivity level at BATAN office Jakarta has been done. Radon is a radioactive emitting alpha particle, very dangerous to the health because if it is inhaled, will be accumulated in the lungs and cause lung cancer. The purpose of the research was to determine the activity concentration of 222Rn in the workplace and to estimate the dose received by workers. The sampling method is purposive sampling, in several office rooms of the BATAN office (staff room, laboratory, and warehouse), measurement 222Rn using RAD7 continuously for 24 hours. Based on the activity concentration of 222Rn in the rooms, an estimate of the effective dose received by the workers while working indoors can be calculated. The results showed that exposure of 222Rn gas radiation in the workplace was relatively varied, radiation exposure in warehouses was 18.90-32.90 (25.90) Bq.m-3 higher than in laboratory 8.20-34.00 (22.43) Bq.m-3 and staff room 5.40-29.60 (16.68) Bq.m-3. The estimated effective dose received by workers in the warehouse is 0.1865 mSv.year-1, laboratory 0.1615 mSv.year-1, and in the staff rooms 0.1267 mSv.year-1, and this value still meets the quality standards of radiation exposure required by the Ministry of Health No. 7 of 2019 and is categorized as safe.

Studi Uji Kesesuaian Selisih Lapangan Kolimasi pada Pesawat Mammografi Analog dan Digital Fitriani Fitriani; Bualkar Abdullah; Dahlang Tahir
Jurnal Fisika FLUX Vol 16, No 2 (2019): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Study of collimation field difference suitability test on analog and digital mammography at leading hospital in Makassar from 2016-2018. This test was carried out by using four coins of the same size placed on the edge of the collimator lamp field, one different size coin was placed on the table edge of the chest wall section, and one coin was placed on the surface under the compression pedal to coincide with the edge of the chest wall. The results of the p value obtained for each measurement point, both for the difference of the light collimation field toward the X-ray beam and the difference of X-ray beam collimation field toward image receptor have the same value of 0.000 (p < 0.05). This value states that there are significant differences in the collimation field difference from 2016-2018. The results of collimation field difference suitability test on analog and digital mammography are still within the tolerance limits recommended by BAPETEN, for the difference of the light collimation field toward X-ray beam ≤ 1% SID and the difference of X-ray beam collimation field toward image receptor ≤ 2% SID. This shows that mammography is feasible and able to operate safely for patients and non-patients.

Pembuatan Prototipe Dye Sensitized Solar Cell (DSSC) Menggunakan Antosianin Dari Dye Bunga Kenikir (Cosmos Caudatus L.) dan Bunga Zinnia ( Zinnia Peruviana) Eunike Dwioknain; Hardianti Hardianti; Dahlang Tahir; Paulus Lobo Gareso
Jurnal Fisika FLUX Vol 16, No 1 (2019): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Prototype dye sensitized solar sel (DSSC) menggunakan antosianin dari bunga Kenikir (Cosmos Cudatus L.) dan bunga Zinnia (Zinnia Peruviana) untuk pertama kalinya telah di fabrikasi. Prototype DSSC dibuat dalam bentuk struktur sandwich, dengan menggunakan metode spin coating untuk deposisi lapisan TiO2., Kemudian dikarakterisasi menggunakan XRD yang menunjukkan Kristal TiO2 berada pada fase anatase, dengan ukuran Kristal sebesar 37,99 nm menggunakan persamaan Debye Scherrer dan 30,10 nm menggunakan metode UDM. Hasil spektrum UV-Vis dalam rentang 300 nm - 800 nm, memperlihatkan absorbansi masing-masing untuk dye bunga Zinnia, bunga Kenikir, dan dye campuran adalah 331 nm; 328 nm; 327 nm. Hasil FTIR menunjukkan adanya senyawa antosianin pada bahan dye yang ditunjukkan dengan adanya ikatan senyawa flavonol, karboksil dan hikdroksil. Keluaran yang di hasilkan dari prototype DSSC berupa arus dan tegangan yang kemudian di akumulasi untuk menghitung efisiensi DSSC. Efisiensi DSSC sebesar 0,0193 % pada dye bunga Zinnia dengan lama perendaman 66 jam. Efisiensi dari DSSC yang terbaik adalah dye dari bunga Zinnia bila dibandingkan dengan bunga Kenikir dan campuran dye dari bunga Kenikir dan bunga Zinnia.

Fabrikasi Bahan Penyerap Gelombang Elektromagnetik Berbasis CuC Hendri Hendri; Bualkar Abdullah; Dahlang Tahir
Jurnal Fisika FLUX Vol 15, No 2 (2018): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Fabrikasi bahan penyerap gelombang elektromagnetik berbasis CuC telah dilakukan. Tembaga Karbon (CuC) diolah dengan metode kompaksi/pemadatan, karakterisasi dilakukan dengan menggunakan XRD, FTIR dan VNA. Penyerap gelombang elektromagnetik (reflection loss (RL)) diperoleh pada rentang -17,73 dB hingga -24,94 dB. Nilai RL dipengaruhi oleh konsentrasi karbon aktif (AC). Spectrum RL terbaik diperoleh pada frekuensi 4 GHz – 5 GHz.

Sintesis Komposit ZnO/Ca3(PO4)2 menggunakan metode Sol-gel sebagai Material Fotokatalis Limbah Cair Industri (Metilen Biru) Nurul Fajri R Tang; Dahlang Tahir; Heryanto Heryanto
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 19, No 1 (2022): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

This study use composite ZnO/Ca3(PO4)2 material was synthesized by using the sol-gel method. Composite material ZnO/Ca3(PO4)2 is made from beef tailbone which is heated at a temperature of 300 for 10, 90, 120, and 240 minutes. Samples were characterized using X-ray diffraction ( XRD ), Fourier transforms infrared ( FTIR ) dan UV - Visible ( UV-Vis ). Quantitative analysis of XRD spectra showed the lowest crystal size with a diameter of 21.71 nm on heating for 90 m. The results of the FTIR spectrum show the vibration of the PO4 and ZnO bond at wavenumber 1039 cm-1 and 400-500 cm-1. The best percentage of degradation is indicated by small crystal size and high infrared absorption by O-H bonds. The degradation results reached 93.98% in just 5 minutes with an energy gap of 3.84 eV. Based on these results, the ZnO/Ca3(PO4)2 composite is one of the promising and potential catalyst materials to solve the problem of industrial waste pollution, especially methylene blue.

Pembuatan Prototipe Dye Sensitized Solar Cell (DSSC) Menggunakan Dye Bunga Pacar Air (Impatiens Balsamina L.) dan Bunga Kertas (Bougenville Spectabilis) Hardianti Adam; Eunike Dwioknain; Dahlang Tahir; Paulus Lobo Gareso
Jurnal Fisika FLUX Vol 16, No 2 (2019): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Prototipe dye sensitezed solar cell (DSSC) yang menggunakan dye dari bunga pacar air (Impatiens Balsamina L.) dan bunga kertas (Bougenville Spectabilis) telah difabrikasi dengan struktur sandwich menggunakan pasta TiO2 yang dideposisi pada kaca ITO dengan metode spin coating. Ekstrak dye dimaserasi selama 24 jam dan digunakan untuk perendaman lapisan TiO2 selama 48 jam dan 66 jam. Bubuk dye dan bubuk TiO2 dikarakterisasi menggunakan FTIR, larutan dye menggunakan UV-Vis dan lapisan tipis TiO2 menggunakan XRD. Hasil karakterisasi UV-Vis dan FTIR menunjukkan adanya pigmen antosianin pada bunga pacar air dan pigmen betalain pada bunga kertas serta adanya gugus hidroksil dan karbonil pada hasil FTIR. Hasil karakterisasi XRD menunjukkan fase anatase pada lapisan tipis TiO2 dan ukuran butir 37,99 nm menggunakan persamaan Scherrer, 30,10 nm menggunakan williamson-Hall dengan metode UDM. DSSC yang dibuat mengahasilkan efesiensi tertinggi pada perendaman 66 jam yaitu pada bunga pacar air 0,0022% dan bunga kertas 0,0090%.

Heat Flow Transport Model by Gauss-Seidel Type Iteration Methods for Gas and Solid Materials Nurlaela Rauf; Heryanto Haeruddin; Roni Rahmat; Dahlang Tahir
Jurnal Fisika FLUX Vol 18, No 1 (2021): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Technological processes for modification of materials, deposition, and prevented fumes in the pyrolysis processes are used gases materials in the medium with vacuum pressure or atmospheric air pressure. Therefore, it is essential to understand heat flow transport for designing an eﬃcient reactor or find the substrate's excellent position in the reactor or furnace for growing materials. We evaluated the energy transfer phenomena in the form of temperature distribution and heat flow for various heating sources for the gases and solid materials by Gauss-Seidel equation. The thermal conductivity coefficient (k), number of heating sources, and position of heating sources show an essential parameter for transmitting the distribution of the heat. For high k value shows efficiently for heat transfer at low temperature due to the atom's position close each other. The heat also affects to the phonon and lattice vibration like a wave which successfully shows these phenomena in this study.

Sintesis Nanopartikel Zno/Al2(So4)3 Dengan Metode Mechanical Alloying Sebagai Katalis Limbah Cair Untuk Meningkatkan Ketersediaan Air Vika Sri Anti; Heryanto Heryanto; Dahlang Tahir
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 19, No 1 (2022): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

ZnO/Al2(SO4)3 synthesized by mechanical alloying method (1, 10, and 15 hours) was applied as methylene blue (MB) photodegradation. Fourier transform infrared (FTIR), X-Ray Diffraction (XRD), and Uv-Visible (Uv-Vis) were used to characterize the Physico-chemical properties of the composites. The results of XRD and FTIR characterization showed an average crystal size of 50.02 nm and the lowest transmittance value (%) at 10 hours milling, the degradation efficiency was much influenced by crystallinity speed, functional groups, and milling time. In this study, the optimal degradation based on the results of the Uv-Vis was shown by the sample ZnO/Al2(SO4)3 for 10 hours milling with a degradation percentage of 84.87%. Furthermore, it was found a ZnO/Al2(SO4)3 composite with a very short degradation time of 20 minutes. In order to reduce water pollution in environments, composite based on natural material is a promising solution due to their ability to break up pollutant radical compounds bonding.

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

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