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PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL)

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Published by Universitas Negeri Jakarta

ISSN : 23021829 EISSN : 24769398 DOI : https://doi.org/10.21009/03

Core Subject : Science, Education, Engineering,

Electrical & Electronics Engineering Energy Physics Other

Focus and Scope: Physics education Physics Instrumentation and Computation Material Physics Medical Physics and Biophysics Physics of Earth and Space Physics Theory, Particle, and Nuclear Environmental Physics and Renewable Energy

Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)

Articles 976 Documents

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FISIKA TENTANG PENGARANGAN TEMPURUNG KELAPA DAN ASAP CAIR Dewanto Kamas Utomo; Dona Mustika; Lilik Hendrajaya
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

E Coconut is a plant that can be used in all parts of a case on husks, shells, water and meat. One of these is the utilization of briquettes and smoke liquid which is the result of the processing of coconut shells. The processing of briquettes and liquid smoke can be studied in physics that can then be used as teaching materials physics. Methods of analysis and observations regarding the processing of coconut shell is done in PT. Tropica Nuficera Industry Yogyakarta. In this case, it has analyzed some physics concepts in the processing briquettes and liquid smoke. Physics concepts are thermodynamics, heat transfer, force and pressure. Keywords: Coconut shell, briqutetes, liquid smoke, physics.

ANALISIS REDUKSI INTENSITAS CAHAYA PADA CONTACT LENSES DAN DAMPAKNYA BAGI PEMAKAI Bhekti Kumorowati; Mahardika Prasetya Aji; Sulhadi Sulhadi; Fuad Ardani Rahman
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

The analysis of light intensity reduction that pass the contact lenses and the identification of contact lensesâ€™ ability as the eyes protector are conducted by measuring light intensity reduction after penetrate contact lenses, then decide the focus of the topic that involved the lightâ€™s ability to penetrate contact lenses, investigation from the quantum physics point of view, and analysis of physical lenses as eyes protector. The negative impact of sunlight radiation is the damage of retina tissue in the eyes. The damage of this tissue is the consequence of the bigness of wavelength; it doesnâ€™t come from the light intensity. Thereby, the contact lenses that are not layered by anti UV canâ€™t be protector from the damage of eyes tissue. Those contact lenses play role as polarizer that is only able to reduce the light intensity. If the light intensity that is entering the eyes decreased, as a result, it will decrease dazzled effect which causes eyesight clearer. Power of light intensity reduction from contact lenses is in line with water-content seen based on the trend of attenuation coefficient quantity. Attenuation coefficient produced by contact lenses which has 38% of water content is 0,46 and 60% of light source produce by laser pointer is 0,56, fluorescent light source is 0,34 and 0,40, and sun light is 0,41 and 0,45. Recommendation in choosing water-content in contact lenses depends on the userâ€™s tears production. If the userâ€™s tears production is rather in a great quantity, it is recommended to use contact lenses with high water-content in order that the position of contact lenses is not easy to shift, although the power of light intensity reduction is rather small, vice versa. Keywords:Contact Lenses, Light Intensity, Wavelength, Photoelectron.

PENGARUH KEDALAMAN PADA OUTPUT FACTOR LAPANGAN KECIL DENGAN DETEKTOR THERMOLUMINESENSE DOSIMETER RODS DAN IONIZATION CHAMBER EXRADIN A16 Laras Ati Nur Fatimah; Andrian Dede Handika; Wahyu Edy Wibowo; Supriyanto Ardjo Prawiro
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Radiotherapy with modern technique is a new choice of accurate and precision radiation therapy. Modern radiotherapy done with the used of small field to shape the field that conform with the volume target. The use of small field related with the treatment planning system (TPS) that assure the treatment delivery correspond with the prescribe dose. Small field is a field with a size less than the lateral range of their charge particles. This condition enable to produce a perturbation of the dose. Commissioning is early procedure to provide machine data to calculate the dose in TPS. The important step is output factor measurement. Output factor important to make sure TPS calculate accurate dose. This research shows output factor measurement with thermoluminesense dosimeter (TLD) LiF an ionization chamber Exradin A16. Radiation field size was 10x10 cmÂ²; 4x4 cmÂ²; 2.4x2.4 cmÂ²; and 0.8x0.8 cmÂ² was used with the solid water phantom measurement. The result then compared with the calculation of TPS PinnacleÂ³. The result shows, the decrease of field size, the decreased of the dose output. The output factor measurement with Exradin A16 shows lower discrepancies than the TLD measurement. The result compared with the extrapolation data of the TPS. Keywords: output factor, small field, radiotherapy, Exradin A16, Thermoluminesense Dosimeter.

EKTRAKSI SILIKON DIOKSIDA DARI DAUN BAMBU Halimah Sa'diyah; Salamet Nurhimawan; Sigit Ahmad Fatoni; Irmansyah Irmansyah; Irzaman Irzaman
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Silika extract has got from bamboo leaf by leaching with HCl 7% p.a. After bamboo leaf was burned, the charcoal was heated in the furnace with annealing rates of 0.9 and 1 Â°C/minute. The first temperature was room temperature, then increased to 400 Â°C with 2 hours arrested time. And last increased to 950 Â°C with 1 hour arrested time. The resulting ash was leached with HCl 7% p.a and its pH was neutralisted by aquabides. Then, the neutral ash was heated in furnace at 1000 Â°C. The result of EDX analysis showed that silica samples have purity levels of 84.53% to 99.99%. FTIR result showed that silica samples have absorption bands at wave numbers of 1071 cm-1, 1060 cm-1 and 798 cm-1 which indicate the asymetric stretching vibration of Si-O from siloxane group. Keywords: silica, bamboo leaves, purity level, function group.

VERIFIKASI DOSIS DI INTERFACE MASSA PADA SIMULASI STEREOTACTIC BODY RADIOTHERAPY (SBRT) KANKER PARU DENGAN TEKNIK PENCITRAAN FAST CT Iin Hidayanti Wulansari; Yosi Sudarsi Asril; Laras Ati Nur Fatimah; Wahyu Edy Wibowo; Supriyanto A. Pawiro
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Lung cancer is one of the cancer disease that most causes death in developing country. Dose prediction for lung cancer is difficult at radiotherapy because interface region in which treatment planning system (TPS) cannot calculate dose accuratelly. This error prediction can affect to lung cancer outcome, especially on SBRT which use high dose on single fraction. CIRS phantom with mass in left lung is used to simulate lung cancer that move with amplitude 0 mm, 5 mm, 10 mm, and 20 mm. The objective of this work is to verify dose at interface mass on lung cancer simulation to determine discrepancy between TPS Pinnacle3 dose calculation and measured dose using Gafchromic Film Gafchromic EBT3. The result showed that for static phantom, dose at interface mass was consitent with TPS doses. But, for dinamic phantom dose at interface significantly lower than TPS dose. Keywords: Lung-tumor interface, lung cancer, SBRT.

SIMULASI AUDIT DOSIMETRI TREATMENT PLANNING SYSTEM FOTON SINAR-X 6 MV MULTICENTER RADIOTERAPI Suwandi Suwandi; Wahyu Edy Wibowo; Supriyanto Ardjo Pawiro
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

TPS is an important modality determining radiotherapy outcome. According to accident and incident international reporting database in radiotherapy, TPS related occurences are among the main sources of errors. TPS requires input beam data obtained through commissioning. The errors at this step results in systematic errors. The purpose of this study is to verify TPS dosimetric to determine the deviation between the dose calculated by TPS and measured dose in phantom representing the dose received tumor targets. This study using CIRS phantom 002LFC representing the human thorax and simulates the whole chain of external beam radiotherapy activities. The phantom was scanned using CT Scanner and eight test cases were planned on TPS, was tested in four centers of radiotherapy. The dose were measured using 0.6 cm3 ionization chambers. Measured and TPS calculated doses were compared. The results of this study showed that most of the deviation are within tolerance. The deviations out of the tolerance found in most of the test cases at center radiotherapy 2. Conclusions of this study is generally, the TPS used for radiotherapy treatment planning at the four centers are good in accuracy, except TPS at center 2, most of the deviation out of tolerance. Keywords: Dosimetric audit, TPS, point dose, deviation, tumor target.

VERIFIKASI DOSIMETRI TEKNIK STEREOTACTIC BODY RADIOTHERAPY (SBRT) METASTASIS TULANG: STUDI KASUS MENGGUNAKAN FANTOM HOMOGEN DAN INHOMOGEN Yosi Sudarsi Asril; Wahyu Edy Wibowo; Supriyanto A. Pawiro
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Cancer causes 13% of all cases the cause of death, and bone metastases is a common complication of cancer that occurs above 40% in oncology patients. Stereotactic Body Radiotherapy (SBRT) is one technique that can handle bone metastases because it can provide a high radiation dose to a small volume with a very tight margin. In the planning of radiotherapy for high-energy photons are often not suitable to estimating dose distribution in inhomogeneous material. Therefore, compared the dose results of two phantom that has a different density, the homogeneous phantom (CIRS Model 002 H9K) and inhomogeneous phantom (CIRS Model 002 LFC) using three dosimeter; microchamber Exradin A16, Gafchromic Film EBT3, and TLD LiF: Mg, Ti rods. The result from both phantom measurements prove that the gafchromic filn EBT3 is the best dosimeter in measuring dose in small field with descripansies dose 0,62% and 1,041% in homogeneous and inhomogeneous phantom. Mikrochamber Exradin A16 also showed the ability to get descripansies -0,51% and -2,61% in homogeneous and inhomogeneous phantom. While descripansies using the TLD LiF:Mg, Ti rods is -11,81% and -12,19% in homogeneous and inhomogeneous phantom. Keywords: Bone Metastasis, SBRT, Mikrochamber Exradin A16, Gafchromic Film EBT3, TLD LiF:Mg, Ti rods.

PENGEMBANGAN ALAT BANTU PEMODELAN TERAPI LENGAN PASCA STROKE DENGAN MEMANFAATKAN SINYAL ELECTROENCEPHALOGRAPHY (EEG) MENGGUNAKAN EMOTIV Ester Fatmawati; Prawito Prawito; Sastra Kusuma Wijaya
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Design modeling has been done post-stroke therapy arm by utilizing command brain signals generated by Electroencephalography (EEG). EEG signals provides a lot of information, one of which is motor information. Every body moving describe the unique form of brain signals. In conditions paralysis, motor information on the EEG signals will still be found when someone tries to move his limbs. The basic concepts of this study are the EEG signal acquisition using the Emotiv EPOC +, controling signal using a device in which NImyRIO and servo motor driving a therapeutic tool. The result of the recording electrode (F3) of Emotiv EPOC shows that differences in the amplitude of the EEG signal in the frequency of 22 Hz when the right arms and left arms trying to move. Differences characteristic EEG signal are used for the motion controller information servomotor. The amplitude of the signal is electric voltage. It is converted into a pulse width to adjust the angle of swivel arm therapeutic tool. Keywords: Electroenchephalography, Emotiv EPOC+, NImyRIO and Frecuency.

PENGARUH PERUBAHAN INTENSITAS CAHAYA AKIBAT GERHANA MATAHARI SEBAGIAN TERHADAP GERAK DAUN Bauhinia purpurea Muhammad Najib Alyasyfi; Dwi Gusrianti; Robby Salam; Rizky Kurniawan; Fahmi Juliansyah; Muhamad Gina Nugraha
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Solar eclipse is an event which occurs when sunlight travelling to earth was blocked by the Moon, causing the intensity of sunlight who reach the earth decreased. A change of intensity could affect the behaviour of certain plants, like Bauhinia purpurea. When it receives light, Bauhinia purpureaâ€™s leaves will opened up, when it receives no light, it will closed. The researchâ€™s objective is to learn the behaviour of Bauhinia purpurea during the eclipse. The observation was done in Bandung at the coordinate 107o35â€™24â€ E 6o51â€™36â€ S, May 9th 2016 when the partial solar eclipse occurs, started at 06:20:37 WIB until 08:32:37 WIB. The leaves movements was recorded with pocket camera, then analyzed with Tracker to obtain the width of leaves gap. The sunlight intensity was obtained by using Stellarium. The results shows that sunlight intensity when the solar eclipse started (0,002%/1384,044328 watt/m2) until it reached the maximum partial solar eclipse (85,9%/194,6032101 watt/m2) cause the leaves to closed up until 4,1 mm wide. While from the maximum until the eclipse is over (1384,044328 watt/m2), caused it to opened up until 5,0 mm wide. This results shows that the movement of Bauhinia purpureaâ€™s leaves was affected by the partial solar eclipse. Keywords: Eclipse, Intensity, Bauhinia purpurea.

PENGARUH KUAT ARUS LISTRIK DC PADA SELENOID TERHADAP KECEPATAN LINEAR SEL BIOLOGIS Nuri Nuri; Mahardika Prasetya Aji; Sulhadi Sulhadi
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Sel biologis merupakan kumpulan partikel yang bermuatan listrik. Jika sel biologis didekatkan dengan muatan listrik yang mengalir maka akan terpengaruh akibat adanya medan listrik dari muatan pada kabel penghantar. Hal ini dipicu adanya gaya interaksi antara muatan dalam inti sel dengan awan elektron yang menyelubunginya, terhadap medan listrik luar yang berasal dari aliran muatan kawat selenoid. Dalam kajian ini ditinjau secara mikroskopis pengaruh muatan listrik yang mengalir pada selenoid terhadap sel darah. Penelitian dilakukan pada setetes darah yang ditempatkan pada preparat microscop, di depan pereparat dipasang sebuah selenoida 1000lilitan dengan panjang 5cm, tegangan DC konstan 12volt dengan nilai kuat arus diubah-ubah. Dengan perbesaran 1000kali untuk memudahkan pengamatan, dibantu dengan camera digital yang terkoneksi langsung dengan laptop. Hasil yang didapatkan adalah dalam keadaan tanpa arus listrik sel darah diam, pada saat arus menaglir 0,05A-0,38A dihasilkan kecepatan dengan rentang nilai antara 11,11pixel/sekon hingga 28,57pixel/sekon. Kesipuanya perubahan kuat arus pada selenoid berkorelasi positif terhadap kecepatan sel darah. Kata kunci : Arus Dc, sel biologi, kecepatan linear, selenoid, dan sel darah.

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Dewi Muliyati

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