Pub Date : 2024-01-27DOI: 10.23960/jtaf.v12i1.2761
A. Rosadi, Posman Manurung, Yanti Yulianti, Roniyus Marjunus, Junaidi Junaidi
In this research, the design and realization of a control system for the height and speed of the motor has been designed and implemented. The system was made to adjust the mixer automatically based on Arduino. The working principle of this system was followed, firstly, the system is given an input of height in cm and the rotational speed in the form of rpm using a 4 × 4 keypad. Arduino used to adjust the ultrasonic sensor as an altitude reader and an optocoupler as a mixer rotary speed reader. The results of the calibration of the two sensors obtained data with a correlation coefficient are 0.991 and 0.970. The stability of the height system and the stirrer speed have good precision indicated by the coefficient of variations were 0.941% and 0.155%. The smaller the coefficient of variation, it is means the better the stability level of the tool. The system accuracy values for measuring the height and speed of the stirrer were 94.78% and 96.34%. So that the reading error of the two sensors are 5.22% and 3.66%. Thus the height control of system and the stirrer rotational speed have a fairly good quality.
{"title":"Desain dan Realisasi Sistem Kontrol Kecepatan dan Ketinggian Motor Menggunakan Sensor Optocoupler dan Sensor Ultrasonik Berbasis Arduino untuk Aplikasi Pengaduk Otomatis","authors":"A. Rosadi, Posman Manurung, Yanti Yulianti, Roniyus Marjunus, Junaidi Junaidi","doi":"10.23960/jtaf.v12i1.2761","DOIUrl":"https://doi.org/10.23960/jtaf.v12i1.2761","url":null,"abstract":"In this research, the design and realization of a control system for the height and speed of the motor has been designed and implemented. The system was made to adjust the mixer automatically based on Arduino. The working principle of this system was followed, firstly, the system is given an input of height in cm and the rotational speed in the form of rpm using a 4 × 4 keypad. Arduino used to adjust the ultrasonic sensor as an altitude reader and an optocoupler as a mixer rotary speed reader. The results of the calibration of the two sensors obtained data with a correlation coefficient are 0.991 and 0.970. The stability of the height system and the stirrer speed have good precision indicated by the coefficient of variations were 0.941% and 0.155%. The smaller the coefficient of variation, it is means the better the stability level of the tool. The system accuracy values for measuring the height and speed of the stirrer were 94.78% and 96.34%. So that the reading error of the two sensors are 5.22% and 3.66%. Thus the height control of system and the stirrer rotational speed have a fairly good quality.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"17 1-3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140492833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-27DOI: 10.23960/jtaf.v12i1.14201
Muhammad Anshory, Yusron Darojat, Yusuf Affandi
In this study, we explore the electronic structure of Janus Chromium Dichalcogenide monolayers CrXY (X ≠ Y = S, Se, Te) in the first Brillouin zone using Density Functional Theory. Due to the mirror symmetry break and strong SOC in the crystal structure of Janus Chromium Dichalcogenide monolayer, we discovered Rashba splitting at Γ points in the first Brillouin zone. We analyze this anisotropy of Rashba splitting using k∙p perturbation theory and group symmetry analysis. By giving the effect of external electric field, we manipulate the characteristics of Rashba splitting on the Janus Chromium Dichalcogenide monolayer. The manipulation of Rashba splitting by applying external electric field, shows that the Janus Chromium Dichalcogenide monolayers has the potential for spintronic devices.
{"title":"Electric Field Controlled Anisotropic Rashba Splitting in Janus Chromium Dichalcogenide Monolayers : A Computational Study based on Density Functional Theory","authors":"Muhammad Anshory, Yusron Darojat, Yusuf Affandi","doi":"10.23960/jtaf.v12i1.14201","DOIUrl":"https://doi.org/10.23960/jtaf.v12i1.14201","url":null,"abstract":"In this study, we explore the electronic structure of Janus Chromium Dichalcogenide monolayers CrXY (X ≠ Y = S, Se, Te) in the first Brillouin zone using Density Functional Theory. Due to the mirror symmetry break and strong SOC in the crystal structure of Janus Chromium Dichalcogenide monolayer, we discovered Rashba splitting at Γ points in the first Brillouin zone. We analyze this anisotropy of Rashba splitting using k∙p perturbation theory and group symmetry analysis. By giving the effect of external electric field, we manipulate the characteristics of Rashba splitting on the Janus Chromium Dichalcogenide monolayer. The manipulation of Rashba splitting by applying external electric field, shows that the Janus Chromium Dichalcogenide monolayers has the potential for spintronic devices.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"16 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140492217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-27DOI: 10.23960/jtaf.v12i1.14179
Yuly Ekayanti, Gando Sari, M. Irsal, Heri Kuswoyo
A contrast thorax CT scan is a CT scan procedure in the chest area (thorax) that uses a contrast agent to improve visualization of organs and structures in the chest. Lung tumors are the growth of abnormal lumps in lung tissue which can be benign or malignant. Awareness of the potential and increasing radiation dose in all CT scan examinations encourages radiographers to want and be able to minimize radiation exposure as the main goal in radiological examinations and also strive for radiation protection during examinations. CT scan radiation dose accounts for 70% of the total dose received from medical imaging. High or low doses of radiation received can increase the risk of cancer. The large dose of radiation received by a patient during a CT scan, therefore regulations are needed that will guarantee monitoring of the radiation dose received by the patient to ensure that the dose received is commensurate with medical purposes. The radiation dose to the patient needs to be optimized by applying the Diagnostic Reference Level (DRL) to optimize medical exposure protection for the patient. Dosage evaluation in clinical contrast chest CT scan examinations for lung tumors and the application of DRL in these examinations have never been carried out at RS X Jakarta. Objective: This study aims to determine the DRL value in clinical contrast thorax CT scan examination of lung tumors at RS CTDIvol and DLP values from clinical contrast Thorax CT Scan examination of lung tumors. The DRL value is calculated at Quartile 3 (75 percentile) using the descriptive frequency test and Wilcoxon test in the SPSS application, then compared with the latest IDRL value. Results: Quartile 3 value (75 percentile) from CTDIvol and DLP CT scan chest contrast clinical lung tumors, namely The CTDIvol value was 12.55 mGy and the DLP was 439 mGy.cm. Conclusion: The DRL value in the clinical contrast thorax CT scan for lung tumors at Hospital X Jakarta. is still below the recommended standard, which shows that the radiation output dose in this examination practice is within normal limits and is classified as safe.
{"title":"Evaluasi Nilai Diagnostic Reference Level (DRL) pada pemeriksaan CT Scan Thorax Kontras klinis tumor paru di RS X Jakarta","authors":"Yuly Ekayanti, Gando Sari, M. Irsal, Heri Kuswoyo","doi":"10.23960/jtaf.v12i1.14179","DOIUrl":"https://doi.org/10.23960/jtaf.v12i1.14179","url":null,"abstract":"A contrast thorax CT scan is a CT scan procedure in the chest area (thorax) that uses a contrast agent to improve visualization of organs and structures in the chest. Lung tumors are the growth of abnormal lumps in lung tissue which can be benign or malignant. Awareness of the potential and increasing radiation dose in all CT scan examinations encourages radiographers to want and be able to minimize radiation exposure as the main goal in radiological examinations and also strive for radiation protection during examinations. CT scan radiation dose accounts for 70% of the total dose received from medical imaging. High or low doses of radiation received can increase the risk of cancer. The large dose of radiation received by a patient during a CT scan, therefore regulations are needed that will guarantee monitoring of the radiation dose received by the patient to ensure that the dose received is commensurate with medical purposes. The radiation dose to the patient needs to be optimized by applying the Diagnostic Reference Level (DRL) to optimize medical exposure protection for the patient. Dosage evaluation in clinical contrast chest CT scan examinations for lung tumors and the application of DRL in these examinations have never been carried out at RS X Jakarta. Objective: This study aims to determine the DRL value in clinical contrast thorax CT scan examination of lung tumors at RS CTDIvol and DLP values from clinical contrast Thorax CT Scan examination of lung tumors. The DRL value is calculated at Quartile 3 (75 percentile) using the descriptive frequency test and Wilcoxon test in the SPSS application, then compared with the latest IDRL value. Results: Quartile 3 value (75 percentile) from CTDIvol and DLP CT scan chest contrast clinical lung tumors, namely The CTDIvol value was 12.55 mGy and the DLP was 439 mGy.cm. Conclusion: The DRL value in the clinical contrast thorax CT scan for lung tumors at Hospital X Jakarta. is still below the recommended standard, which shows that the radiation output dose in this examination practice is within normal limits and is classified as safe.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"8 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140492514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fixer solution is a chemical substance in the form of a concentrated liquid that is used to wash radiographic films. The Fixer Solution functions to dissolve the silver halide layer on unexposed radiographic films. This research aims to design a waste fixer solution processing device using the electrolysis method and to regulate the voltage to the optimal point to produce a large electrolysis rate. Design an electrolysis device using stainless steel electrodes with a trapezoidal cathode with parallel sides of the cathode with lengths of 170 mm, 145 mm and a cathode height of 155 mm. The anode is rectangular with a length of 30 mm and a height of 169 mm. The method for making tools goes through several stages, namely making tool designs, testing tools, and testing waste fixer solution. The fixer waste used comes from Betesdha Wonosari Hospital. In this research, each test used 5 liters of fixer waste at each voltage which was regulated for 3 hours. The higher the mass voltage produced, the higher the electrolysis rate will be. However, the higher the voltage, the faster the sulfidation process will be. In the design of this fixer waste management tool, it can work optimally at a voltage of 4 V with a speed of 4.87 g/hour.
{"title":"Optimasi Pemisahan Perak dari Limbah Fixer melalui Variasi Tegangan","authors":"Efita Pratiwi Adi, H. Hartono, Zaroh Irayani, Adilla Luthfia, Ade Mulawarman","doi":"10.23960/jtaf.v12i1.14182","DOIUrl":"https://doi.org/10.23960/jtaf.v12i1.14182","url":null,"abstract":"Fixer solution is a chemical substance in the form of a concentrated liquid that is used to wash radiographic films. The Fixer Solution functions to dissolve the silver halide layer on unexposed radiographic films. This research aims to design a waste fixer solution processing device using the electrolysis method and to regulate the voltage to the optimal point to produce a large electrolysis rate. Design an electrolysis device using stainless steel electrodes with a trapezoidal cathode with parallel sides of the cathode with lengths of 170 mm, 145 mm and a cathode height of 155 mm. The anode is rectangular with a length of 30 mm and a height of 169 mm. The method for making tools goes through several stages, namely making tool designs, testing tools, and testing waste fixer solution. The fixer waste used comes from Betesdha Wonosari Hospital. In this research, each test used 5 liters of fixer waste at each voltage which was regulated for 3 hours. The higher the mass voltage produced, the higher the electrolysis rate will be. However, the higher the voltage, the faster the sulfidation process will be. In the design of this fixer waste management tool, it can work optimally at a voltage of 4 V with a speed of 4.87 g/hour.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"135 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140492619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-27DOI: 10.23960/jtaf.v12i1.14197
Imam Tri harsoyo, M. Ulin Nuha ABA, Bayu Wahyudi, Dennis Aji Firmansyach
Hotplate magnetic stirrer merupakan peralatan laboratorium yang digunakan untuk membuat suatu larutan menjadi homogen dengan memanaskan cairan dan mengaduknya menggunakan batang pengaduk magnet. Pelat pemanas pada pengaduk menjaga larutan pada suhu konstan sambil dilakukan pengadukan sehingga mampu mempercepat proses pencampuran. Gelas beaker yang berisi larutan yang akan diaduk dan berisi batang magnet diletakkan diatas plate. Perancangan prototipe magnetic stirrer dengan dilengkapi pemanas beserta pengatur waktu dan kecepatan melalui LCD Nextion bertujuan untuk mempermudah pekerjaan seorang laboran dalam proses homogenisasi suatu larutan, dengan menggunakan batang magnet sebagai pengaduk. Berdasarkan data hasil pengujian alat yang telah dilakukan, hasil yang didapat dari pengujian yaitu dinyatakan bahwa alat dapat bekerja pada putaran 500 Rpm hingga 5000 Rpm dengan persentase error 1,4 – 5,6 %, tingkat error suhu yang disetting sebesar 0,3 – 0,8%, dan selisih waktu terhadap waktu setting adalah 0,42’. Persentase error (kesalahan) untuk pengukuran waktu, suhu dan kecepatan tidak melewati batas normal (masih dibawah 10%) sesuai yang dipersyaratkan oleh dinas kesehatan.
{"title":"Hotplate Magnetic Stirrer Dilengkapi Pengatur Waktu, Suhu dan Kecepatan Melalui LCD Nextion","authors":"Imam Tri harsoyo, M. Ulin Nuha ABA, Bayu Wahyudi, Dennis Aji Firmansyach","doi":"10.23960/jtaf.v12i1.14197","DOIUrl":"https://doi.org/10.23960/jtaf.v12i1.14197","url":null,"abstract":"Hotplate magnetic stirrer merupakan peralatan laboratorium yang digunakan untuk membuat suatu larutan menjadi homogen dengan memanaskan cairan dan mengaduknya menggunakan batang pengaduk magnet. Pelat pemanas pada pengaduk menjaga larutan pada suhu konstan sambil dilakukan pengadukan sehingga mampu mempercepat proses pencampuran. Gelas beaker yang berisi larutan yang akan diaduk dan berisi batang magnet diletakkan diatas plate. Perancangan prototipe magnetic stirrer dengan dilengkapi pemanas beserta pengatur waktu dan kecepatan melalui LCD Nextion bertujuan untuk mempermudah pekerjaan seorang laboran dalam proses homogenisasi suatu larutan, dengan menggunakan batang magnet sebagai pengaduk. Berdasarkan data hasil pengujian alat yang telah dilakukan, hasil yang didapat dari pengujian yaitu dinyatakan bahwa alat dapat bekerja pada putaran 500 Rpm hingga 5000 Rpm dengan persentase error 1,4 – 5,6 %, tingkat error suhu yang disetting sebesar 0,3 – 0,8%, dan selisih waktu terhadap waktu setting adalah 0,42’. Persentase error (kesalahan) untuk pengukuran waktu, suhu dan kecepatan tidak melewati batas normal (masih dibawah 10%) sesuai yang dipersyaratkan oleh dinas kesehatan.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"47 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140492868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-27DOI: 10.23960/jtaf.v12i1.14202
sri wahyu suciayti
Nano-ZnO biosynthesis has been carried out using Chaya leaves with the addition of 0.7M NaOH. The aim is to determine the results of nano-ZnO synthesis regarding the formation of functional groups, phase structure, morphology, band gap energy, and its potential as an antibacterial. The synthesis process was carried out in three stages, namely, extraction of Japanese papaya leaves, synthesis of nano-ZnO, and characterization using Fourier Transform Infra Red (FTIR), X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), and UV-Diffuse Reflectance (UV-DRS). Nano-ZnO samples were applied in antibacterial tests. The results of FTIR analysis show the formation of ZnO functional groups at wave numbers 599-509 cm-1 with the main functional groups involved being O-H, C=O, N-H, and C-N. The results of the XRD analysis showed that the phases formed in the sample were zinc oxide, zinc phosphate, zinc iron oxide and zinc chlorate hydrate. Factors that influence the formation of other phases are because Japanese papaya leaves contain phosphorus and iron, the ZnO phase formed has a wurtzite structure. The results of UV-DRS analysis show that the band gap energy is close to the standard of 3.24 eV with an absorbance value of 362 nm. TEM results show that the particle morphology experiences agglomeration due to the presence of other compounds. The antibacterial activity of Nano-ZnO with a NaOH concentration of 0.7 M resulted in an average zone of inhibition of bacterial growth in E.coli of 0.21 mm.
{"title":"Peningkatan Fungsi Daun Chaya sebagai Agen Reduksi pada Sintesis Seng Nanopartikell","authors":"sri wahyu suciayti","doi":"10.23960/jtaf.v12i1.14202","DOIUrl":"https://doi.org/10.23960/jtaf.v12i1.14202","url":null,"abstract":"Nano-ZnO biosynthesis has been carried out using Chaya leaves with the addition of 0.7M NaOH. The aim is to determine the results of nano-ZnO synthesis regarding the formation of functional groups, phase structure, morphology, band gap energy, and its potential as an antibacterial. The synthesis process was carried out in three stages, namely, extraction of Japanese papaya leaves, synthesis of nano-ZnO, and characterization using Fourier Transform Infra Red (FTIR), X-Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), and UV-Diffuse Reflectance (UV-DRS). Nano-ZnO samples were applied in antibacterial tests. The results of FTIR analysis show the formation of ZnO functional groups at wave numbers 599-509 cm-1 with the main functional groups involved being O-H, C=O, N-H, and C-N. The results of the XRD analysis showed that the phases formed in the sample were zinc oxide, zinc phosphate, zinc iron oxide and zinc chlorate hydrate. Factors that influence the formation of other phases are because Japanese papaya leaves contain phosphorus and iron, the ZnO phase formed has a wurtzite structure. The results of UV-DRS analysis show that the band gap energy is close to the standard of 3.24 eV with an absorbance value of 362 nm. TEM results show that the particle morphology experiences agglomeration due to the presence of other compounds. The antibacterial activity of Nano-ZnO with a NaOH concentration of 0.7 M resulted in an average zone of inhibition of bacterial growth in E.coli of 0.21 mm.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"192 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140492350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-27DOI: 10.23960/jtaf.v12i1.14174
Andri Yadi Paembonan, Fedy Darma Wijaya Waruwu
Infrastructure development at the Sumatra Institute of Technology is growing rapidly, hence, it requires new utilities installation network such as cables and pipes to supply electricity and clean water. Installing new utility line, it is necessary to secure and know the existence and depth of the previously embedded utility network to avoid damage that could hamper the construction process or cause large losses. Accessing the sub-surface information, geophysical method, such as Ground Penetrating Radar (GPR) can be utilized for identifying buried utility networks, ensuring the safe installation of new utilities and preventing damage to existing embedded utilities. In this study, a GPR device with a frequency range 40 MHz-3.4 GHz comprising 5 tracks was employed. The acquired data underwent processing using GPR Insights software, generating a radargram cross-section that provides information about the subsurface.The results from the radargram reveal a hyperbolic reflection anomaly, signifying the presence of a utility network beneath the surface, suspected to be pipe and cable utilities. The utility network is detected at varying depths of 0.5 m, 0.8 m, 1 m, and 1.2 m at different distances. Furthermore, several anomalies in the form of hyperbolas are observed, suggesting potential utilities due to their continuity with other paths.
{"title":"Subsurface Utility Identification at ITERA Campus Using Multi-frequency Ground Penetrating Radar","authors":"Andri Yadi Paembonan, Fedy Darma Wijaya Waruwu","doi":"10.23960/jtaf.v12i1.14174","DOIUrl":"https://doi.org/10.23960/jtaf.v12i1.14174","url":null,"abstract":"Infrastructure development at the Sumatra Institute of Technology is growing rapidly, hence, it requires new utilities installation network such as cables and pipes to supply electricity and clean water. Installing new utility line, it is necessary to secure and know the existence and depth of the previously embedded utility network to avoid damage that could hamper the construction process or cause large losses. Accessing the sub-surface information, geophysical method, such as Ground Penetrating Radar (GPR) can be utilized for identifying buried utility networks, ensuring the safe installation of new utilities and preventing damage to existing embedded utilities. In this study, a GPR device with a frequency range 40 MHz-3.4 GHz comprising 5 tracks was employed. The acquired data underwent processing using GPR Insights software, generating a radargram cross-section that provides information about the subsurface.The results from the radargram reveal a hyperbolic reflection anomaly, signifying the presence of a utility network beneath the surface, suspected to be pipe and cable utilities. The utility network is detected at varying depths of 0.5 m, 0.8 m, 1 m, and 1.2 m at different distances. Furthermore, several anomalies in the form of hyperbolas are observed, suggesting potential utilities due to their continuity with other paths.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140493024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Viscometer plays an important role in the field of tribology. One way to measure viscosity is to use the Stokes drag principle in the underdamped harmonic oscillation phenomenon. This paper proposes a dynamic viscosity measurement method based on the related physical laws. Our experimental model involves a prolate ellipsoidal mass that experiences underdamped harmonic oscillation within viscous liquid samples. We observed the oscillations of the prolate ellipsoid to obtain the viscous damping coefficient of each sample and substituted it to the theoretical formula of dynamic viscosity. Experimental data suggest that the mathematical model has failed to predict the viscosity values of the samples. In addition, the regression curve of the reference viscosity and the measured viscous damping coefficient shows that the two quantities have an exponential relation instead of linear relation as explained in the theoretical model. We considered the regression formula as the empirical measurement transfer function and used it to measure the viscosity of an ISO VG 150 industrial oil sample. This measurement resulted in a 2.40 % of relative error percentage. Lastly, this measurement method is only valid for measuring samples with viscosities ranging from 0.0400 Pa s to 0.256 Pa s.
粘度计在摩擦学领域发挥着重要作用。测量粘度的一种方法是利用欠阻尼谐振现象中的斯托克斯阻力原理。本文根据相关物理定律提出了一种动态粘度测量方法。我们的实验模型涉及一个在粘性液体样品中经历欠阻尼谐波振荡的质点。我们通过观察质点的振荡来获得每个样品的粘滞阻尼系数，并将其代入动态粘度的理论公式。实验数据表明，数学模型无法预测样品的粘度值。此外，参考粘度与测得的粘滞阻尼系数的回归曲线表明，这两个量呈指数关系，而不是理论模型所解释的线性关系。我们将回归公式视为经验测量传递函数，并用它来测量 ISO VG 150 工业油样的粘度。测量结果的相对误差为 2.40%。最后，这种测量方法仅适用于测量粘度范围为 0.0400 Pa s 至 0.256 Pa s 的样品。
{"title":"Dynamic Viscosity Measurement Method Based on the Stokes Drag of Prolate Ellipsoidal Mass","authors":"Arifrahman Yustika Putra, Efta Yudiarsah, Arief Sudarmaji","doi":"10.23960/jtaf.v12i1.14205","DOIUrl":"https://doi.org/10.23960/jtaf.v12i1.14205","url":null,"abstract":"Viscometer plays an important role in the field of tribology. One way to measure viscosity is to use the Stokes drag principle in the underdamped harmonic oscillation phenomenon. This paper proposes a dynamic viscosity measurement method based on the related physical laws. Our experimental model involves a prolate ellipsoidal mass that experiences underdamped harmonic oscillation within viscous liquid samples. We observed the oscillations of the prolate ellipsoid to obtain the viscous damping coefficient of each sample and substituted it to the theoretical formula of dynamic viscosity. Experimental data suggest that the mathematical model has failed to predict the viscosity values of the samples. In addition, the regression curve of the reference viscosity and the measured viscous damping coefficient shows that the two quantities have an exponential relation instead of linear relation as explained in the theoretical model. We considered the regression formula as the empirical measurement transfer function and used it to measure the viscosity of an ISO VG 150 industrial oil sample. This measurement resulted in a 2.40 % of relative error percentage. Lastly, this measurement method is only valid for measuring samples with viscosities ranging from 0.0400 Pa s to 0.256 Pa s.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"42 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140492032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-27DOI: 10.23960/jtaf.v12i1.3176
Grace Pricilya Michiko, Arif Surtono, Humairoh Ratu Ayu, Junaidi Junaidi
It has been realized the design of the orange based sweet level measuring device using an arduino based semi cylinder capacitor sensor. This study was conducted by providing input to the capacitor plates using an oscillator with a variety of frequency values of 10 KHz, 100 KHz, and 1 MHz. The oscillator used is the IC XR-2206 type. The sweet level of orange fruit is measured using a pocket refractometer otago pal-α. Semi cylinder capacitor sensor testing is carried out on 16 oranges. The most optimal measurement results are obtained in a 100 KHz frequency variation because the graph of the measurement results drops linearly. The voltage range at a frequency of 100 KHz is 200 - 2000 mV, with a brix value obtained between 13.8 - 16.7%. The higher the orange voltage, the lower the Brix value contained in oranges. Brix value 13.8 - 15.6% states the sweet level of orange fruit is sour, while the Brix value 16.7% states the sweet level of orange fruit is sweet. The results of testing the tool obtained an average error value of 0,004% and a tool accuracy value of 99,6%.
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Pub Date : 2024-01-27DOI: 10.23960/jtaf.v12i1.12551
Irma Rahmania, Tri Suranti
Latar Belakang : Salah satu problem yang biasa ditemui pada pesawat sinar-X adalah ketidaktepatan luas lapang kolimator terhadap luas lapang berkas sinar-X. Pada pengukuran kesesuaian luas lapang berkas radiasi terhadap berkas cahaya, apabila hasil yang didapatkan adalah berhimpit atau tidak, maka dapat ditentukan ada atau tidaknya pergeseran antara luas lapang berkas radiasi terhadap berkas cahaya. Tujuan Umum: Untuk menghasilkan modifikasi rancang bangun alat Uji Colimator & Beam Alignment Test Tool di instalasi radiologi RSUD Dr. Hi. Abdul Moeloek di provinsi Lampung. Metodologi Penelitian: Desain penelitian ini menggunakan Desain Deskriptif Kuantitatif pendekatan eksperimen terhadap modifikasi Uji Colimator & Beam Aligment Test Tool. Deskriptif adalah metode yang berfungsi untuk mendeskripsikan atau memberi gambaran terhadap objek yang diteliti melalui data atau sampel yang telah terkumpul sebagaimana adanya, tanpa melakukan analisis dan membuat kesimpulan yang berlaku umum Hasil dan Kesimpulan : hasil pengukuran pada kamar 6 menunjukan bahwa Skala luas lapangan kolimator Standar NCRP (≤ 2 %) yaitu 0.5 cm dan Kesearahan berkas sinar-X Standar NCRP (≤30) yaitu 0.60.
背景：X 射线飞机通常遇到的问题之一是准直器场区与 X 射线束场区的误差。在测量辐射光束场与光束的一致性时，如果得到的结果接近或不接近，就可以确定辐射光束场与光束之间是否存在偏移。总体目标：在楠榜的 RSUD Hi.Abdul Moeloek 位于楠榜省。研究方法：本研究设计采用定量描述性设计实验方法来修改套准仪和光束对准测试工具。描述性是一种通过已收集到的数据或样本对研究对象进行描述或概述的方法，不进行分析，也不做一般性结论 结果与结论：6 号房间的测量结果显示，NCRP 标准准直仪场区刻度（≤ 2%）为 0.5 厘米，NCRP 标准 X 射线束对齐度（≤30）为 0.60。
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