Arief Sudarmaji | Universitas Indonesia ui (original) (raw)

Papers by Arief Sudarmaji

Indonesian Journal of Cancer, Dec 21, 2023

Background: The occurrence of motion in the thoracoabdominal region during radiotherapy treatment... more Background: The occurrence of motion in the thoracoabdominal region during radiotherapy treatment is an inherent challenge affecting the accuracy of the radiation beam. To address this challenge, a margin is often incorporated to compensate for the motion, but it has been reported to have several limitations. Consequently, respiratory gating has emerged as an integrated feature within radiotherapy-related machines. This innovative approach is designed to overcome motion-related challenges, leading to a reduction in the required margin and an improvement in the accuracy of the radiation beam. Methods: This study reviews the literature published in English between 2012 to 2021 regarding breathing monitoring devices used in the clinical or research stage. Furthermore, articles published before 2000 were traced to strengthen the theories. Results: Several monitoring devices had been reported to have respiratory gating purposes, but some were not equipped for this function. Furthermore, these devices were often developed using non-contact equipment, such as lasers and cameras, to provide accurate and precise measurements. One of their key advantages is the lack of physical attachment to the patients, thereby preserving comfort. The development of respiratory gating devices had significant potential to enhance the quality of radiotherapy treatment. This was manifested through more effective tumor and organ treatment and reduced toxicity. These benefits had the potential to extend the life expectancy of patients with respiratory-related cancer. Conclusions: Based on the results, respiratory gating was an advantageous technique in radiotherapy treatment. The development of respiratory gating devices enhanced patient comfort and the effectiveness of treatment.

IOP Conference Series: Earth and Environmental Science

Determination of diffusion coefficient using the Wiener method has shown a high level of agreemen... more Determination of diffusion coefficient using the Wiener method has shown a high level of agreement with literature in previous studies, particularly for liquids with a mass of less than hundreds of amu and a small molecule-sized order of Angstrom (atomic mass unit). This method involves a laser beam deflection and refraction phenomenon on the inter-diffusion zone of two fluids with different refractive indexes. Palm oil, vegetable oil with a composition and structure that is quite complicated and size relatively large molecule, has abundantly available and has become one of the primary raw materials for biodiesel production and cooking. This study used the method to examine the diffusivity of palm oil in n-hexane, which is still rare and hard to find, so challenging to be studied. A camera is used to catch the trace of a deflected laser beam on a screen after it passes through a diffusion cell in the measurement. This image was then corrected, made grey, and digitized to extract the...

Universitas Indonesia, 2012

2018 International Seminar on Intelligent Technology and Its Applications (ISITIA), 2018

In this research, an optical system is made and aims for Faraday rotation apparatus. This system ... more In this research, an optical system is made and aims for Faraday rotation apparatus. This system was designed and made to measure the rotation angle of plane of polarization on analyzer, light intensity, and value of magnetic field, where as the analyzer angle setting is done by using a stepper motor which connected to the lens of analyzer by a gear set, for the light intensity the writer measured it with a lux meter IC BH1750, and the magnetic field measured based on the current which given by constant current power supply. Number of pulses on the stepper motor and the data from the IC BH1750 is being acquired using a microcontroller. In this research, the writer used two variable wave length from different color on 30 watt LED as the light sources, all of these light sources are being controlled by the microcontroller. Based on this research, the writer conclude that there are transfer function (p= 17.832θ), where (θ) is the rotation angle of analyzer and (P) is the pulse that is ...

2017 International Seminar on Sensors, Instrumentation, Measurement and Metrology (ISSIMM), 2017

Recently, various studies have been proposed for mass transfer coefficient, mainly motivated by a... more Recently, various studies have been proposed for mass transfer coefficient, mainly motivated by a broad application such as oil transfer and liquid-liquid interdiffusion. On the other hand, increasing sensitivity and signal to noise ratio of conventional laser beam deflection measurement system is an interesting topic in structure material and instrumentation research. In this work, an enhanced laser beam deflection measurement system was constructed to determine the diffusion coefficient of liquid-liquid material, and it worked well based on the Wiener method. Sodium chloride aqueous solution and distilled water were poured in a glass cell abd then illuminated by the laser beam tilted 45° to the vertical, exhibiting a reflection of straight line light on the screen. The reflection pattern on screen was captured by camera and processed. Image processing and calculation have been completed to determine refractive index gradient and the diffusion coefficient. Furthermore, the diffusion coefficient of Sodium chloride is found to be in a good agreement with coefficient values specified in the literature.

PROCEEDINGS OF THE 4TH INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES (ISCPMS2018), 2019

Nowadays, a lot of research have been done about the diffusion process, generally motivated by th... more Nowadays, a lot of research have been done about the diffusion process, generally motivated by the diffusion process in oil and between liquids. In addition, improving the sensitivity and performance of laser beam deflection measurement system is an attractive subject in materials and instrumentation research. In this study, diffusion coefficient measurement system based on laser beam deflection has been developed to specify the diffusion coefficient of liquid-liquid material and well succeeded by following the Wiener experimental method. The Sodium chloride and water solution are poured into the diffusion cell and then illuminated by the laser beam that forms a line tilted 45° to the vertical. Image processing and measurement have been performed to specify the refractive index gradient and the diffusion coefficient. The diffusion coefficient of Sodium chloride is discovered to be in a good agreement with the literature.

PROCEEDINGS OF THE 4TH INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES (ISCPMS2018), 2019

Enhancing the solubility of n-type diketopyrrolopyrrole-dicyanovinyl molecules with hybrid siloxa... more Enhancing the solubility of n-type diketopyrrolopyrrole-dicyanovinyl molecules with hybrid siloxane group for solution-processable organic field-effect transistor

Journal of Physics: Conference Series, 2019

This study aimed to make in-house dynamic thorax phantom that simulate translational and rotation... more This study aimed to make in-house dynamic thorax phantom that simulate translational and rotational direction mimicking NSCLC target movement. In addition,this study also investigate dosimetric effect of target movement for several translational amplitude. This work used in-house dynamic thorax phantom based on CIRS Dynamic Thorax Phantom model 008A. This phantom simulated translation in superior-inferior direction, rotational in the anterior-posterior and left-right lateral plane to mimic human respiratory motion. It was designed and controlled by linear actuator motor, servo motor, Adafruit motor shield L293D and Arduino UNO R3. It was implemented to evaluate point dose of 3D-CRT, IMRT, VMAT technique and for 5 mm; 10 mm; 15 mm translational motion amplitude 90° rotational target motion amplitude. The GafChromic EBT 3 film was used as a dosimeter for point dose measurement. This in-house dynamic thorax phantom can mimicking NSCLC target movement for translational amplitude 5 ± 1 m...

AIP Conference Proceedings, 2017

EEG data acquisition system 32 channels based on Raspberry Pi with relative power ratio and brain... more EEG data acquisition system 32 channels based on Raspberry Pi with relative power ratio and brain symmetry index features

Reports of Practical Oncology and Radiotherapy

this article is available in open access under creative common attribution-non-commercial-no Deri... more this article is available in open access under creative common attribution-non-commercial-no Derivatives 4.0 international (cc BY-nc-nD 4.0) license, allowing to download articles and share them with others as long as they credit the authors and the publisher, but without permission to change them in any way or use them commercially

2017 International Seminar on Sensors, Instrumentation, Measurement and Metrology (ISSIMM)

Interdiffusion between two liquids with different refractive index measurement system has been ca... more Interdiffusion between two liquids with different refractive index measurement system has been carefully constructed by using laser beam deflection method. The deflection pattern comes from refraction of the beam when it enters the interface of two different refractive index liquids. The diffusion coefficient is determined by observing refractive index gradients of liquid-liquid on the interface. In this phenomenon, mass transfer from liquid to liquid plays an important role and described using the Fick's law. The diffusion experiments have been performed with NaCl-aqueous solution. Interestingly, we found the diffusion coefficient of NaCl in reasonably good agreement with coefficient values specified in the literature. With simple setup and data analysis, we believe that the measurement system can be used to observe mass transfer in liquid accurately.

International Journal of Power Electronics and Drive Systems (IJPEDS)

This study explores the numerical optimization of water turbine runner profile performance using ... more This study explores the numerical optimization of water turbine runner profile performance using a surface vorticity model algorithm. The turbine is designed on a laboratory scale and operates at a net head of 0.09 m, 400 rpm, and a water flow rate of 0.003 m3/s. The initial design of the turbine runner was optimized to minimize losses in the hydrofoil. The optimization algorithm is coded in MATLAB software to obtain the optimal stagger angle that will be used in the water turbine design. Furthermore, design validation was performed using computational fluid dynamics analysis ANSYS CFX to determine the water turbine performance. The settings used in ANSYS CFX include the reference pressure of 1 atm, turbulence model shear stress transport, and inlet boundary conditions using total pressure and static pressure outlet boundary conditions. The computational fluid dynamics analysis reveals that by optimizing the design, the efficiency of the water turbine increases by approximately 2.6%...

2020 10th Electrical Power, Electronics, Communications, Controls and Informatics Seminar (EECCIS), 2020

This research describes designsand calibration of drum collector and Analog-to-Digital Converters... more This research describes designsand calibration of drum collector and Analog-to-Digital Converters (ADC) of high voltage for nano-fiber electrospinning based on microcontroller systems. Electrospinning is commonly used to make nanofibers electrostatically which then produces nanofiber polymers with a diameter in the nanometer scale from a high voltage polymer solution. Compared to conventional technology, electrospinning is more versatile and efficient technique. However, several important parameters must be considered in solutions, control processes, and the environment. High voltage and collector instrument are required for applying electrospinning technique. Collectors have a significant effect on the productivity and the arrangement of nanofibers and the final structure. The rotation speed or RPM of the drum collector must be controlled to obtain the optimal nanofibrous membranes. Voltage control is also an important factor in this electrospinning technique, therefore it is necessary to control the applied high voltage. The microcontroller used in this system is Arduino nano. The hardware in this system consists of A4988 motor driver, high voltage, drum collector. Communication between the microcontroller and ADC uses the Serial Peripheral Interface (SPI). Serial communication with baud rate of 9600 was used for communication between the microcontroller and PC. The calibration transfer function of drum collector is y = 0.0048 + 0.0015 with R square is 0.999. The calibration transfer function of ADC is y = 3.10e-7 – 0.0003 with R square = 1. ADC calibration values used have also been successfully carried out with error of 0.347%.

Journal of Physics: Conference Series, 2020

The purpose of this study is to calibration a mechanical system of In-house Dynamic Thorax Phanto... more The purpose of this study is to calibration a mechanical system of In-house Dynamic Thorax Phantom so that it can be used as a dosimetry on the Radiotherapy Real-Time Position Management (RPM) technique. In order to ensure the RPM technique had properly function, we need to employ a quality control tool that represents moving objects on the human body. Inspired by the CIRS Dynamic Thorax Phantom model 008A, we developed an In-house Dynamic Thorax Phantom using three Nema-17 stepper motors with 200 steps in a cycle as a mechanical system. In addition, the first stepper motor was used to move objects in superior-inferior direction; the second one was used to move the RPM marker in anterior-posterior direction; while the third one was used to move objects in rotation. Calibration of mechanical system was performed by finding out the number of counts needed each direction. Especially for rotational system, they were calibrated with Optical Interrupt Device. The result of calibration of ...

2020 International Seminar on Intelligent Technology and Its Applications (ISITIA), 2020

This research describes the design and calibration of a microfluidic syringe pump-based microcont... more This research describes the design and calibration of a microfluidic syringe pump-based microcontroller systems. Micro-scale syringe pump systems are needed in the medical, sensor industries or research such as nano-fiber electrospinning [1]. The design of the syringe pump is modular and simple which facilitates the configuration of syringes and motors that are different so that they independent from each other between the syringe pump. The distance of each syringe pump can be adjusted from each other. The key issue here is how to make the syringe pump have flow with very high accuracy and precision. Each pump has a stepper motor that drives the lead screw, which in turn moves the sled (mounted on a linear ball bearing) which pushes (inserts) or pulls (sucks) the syringe. The gravimetric method is used to determine the volume and flow rate. The gravimetric method is the primary method used to determine flow and it consists of determining the mass delivered from the infusion pump in relation to time. The motor driver used to control the syringe pump uses a single Pololu A4988 stepper controller, which controls the stepper motor that drives the syringe pump. The microcontroller used in this system is Arduino nano. Communication between the microcontroller and PC uses serial communication with a baud rate of 9600. The calibration transfer function of a microfluidic syringe pump system is mathbfy=mathbf0.233x+mathbf3.10e−mathbf5\mathbf{y}=\mathbf{0.233x}+\mathbf{3.10e}-\mathbf{5}mathbfy=mathbf0.233x+mathbf3.10e−mathbf5 with R squared value is 1. The system flow-rate can be set up to 0.0043 mL/second or 15480 uL/hour with error 0,674%.

2020 10th Electrical Power, Electronics, Communications, Controls and Informatics Seminar (EECCIS), 2020

The design of measuring devices for ferroelectric properties needs to be developed to support res... more The design of measuring devices for ferroelectric properties needs to be developed to support research on the nature of ferroelectric materials such as hysteresis. An integrated system and a fully automatic hysteresis characterization process are needed along with the uncertainty of the measurement parameters obtained. Through this research, an instrumentation system was built which aims to trace the hysteresis curve of a sample with ferroelectric materials. High voltage is given to the ferroelectric sample that can be controlled to produce an electric field that can cause capacitance and polarization in the sample. Measurements of polarization data, electric fields and formation of hysterical curves generated by the samples were done in the LabVIEW application. The conclusion obtained from this research is piezo buzzer sample has a polarization characteristic that can be changed by adjusting the value of the electric field given through high voltage control.

2020 International Seminar on Intelligent Technology and Its Applications (ISITIA), 2020

Multiferroic material is rapidly developing based on the increase of publication in its keyword e... more Multiferroic material is rapidly developing based on the increase of publication in its keyword each year. Multiferroic is a material which has two or more ferroic properties; ferroelectric, ferromagnetic, and ferroelastic. In this research, we want to know whether magneto-electric multiferroic or a material that exhibits ferroelectricity and ferromagnetic can be affected by magnetic field. By designing an instrument that can measure change in relative permittivity to frequency when given a magnetic field then we can find out whether the material being tested is a magneto-electric multiferroic or not. Relative permittivity measurement result of piezoelectric sample is 18047–35254 at 100Hz-1kHz frequency range and 9524–18047 at 1kHz-10kHz frequency range. These results when affected by a magnetic field stay the same because piezoelectric is a ferroelectric material.

Key Engineering Materials, 2020

La0.7Ba0.25Nd0.05MnO3 (LBNMO) compounds were synthesized using two different methods, namely are ... more La0.7Ba0.25Nd0.05MnO3 (LBNMO) compounds were synthesized using two different methods, namely are solid-state reaction (SS) and sol-gel (SG). All samples were heat-treated at 1200 °C for 12 hours. The investigation on structural, morphological, and magnetic properties was carried out by X-Ray Diffractometer (XRD), Scanning Electron Microscope (SEM), and Vibrating Samples Magnetometer (VSM) at room temperature. From the Rietveld refinement, both samples have formed a rhombohedral structure with an R-3c (167) space group. The average crystallite size was calculated using the Scherrer formula and Williamson-Hall (W-H) method for comparison. It was shown that the crystallite size of the sample produced by the SG method has larger than the SS method. This result is fairly consistent with the result obtained from SEM analysis, which shows that the average grain for the SG sample is larger than of the grain of the SS samples. From the magnetic hysteresis curve, the magnetization saturation ...

Indonesian Journal of Cancer, Dec 21, 2023

Background: The occurrence of motion in the thoracoabdominal region during radiotherapy treatment... more Background: The occurrence of motion in the thoracoabdominal region during radiotherapy treatment is an inherent challenge affecting the accuracy of the radiation beam. To address this challenge, a margin is often incorporated to compensate for the motion, but it has been reported to have several limitations. Consequently, respiratory gating has emerged as an integrated feature within radiotherapy-related machines. This innovative approach is designed to overcome motion-related challenges, leading to a reduction in the required margin and an improvement in the accuracy of the radiation beam. Methods: This study reviews the literature published in English between 2012 to 2021 regarding breathing monitoring devices used in the clinical or research stage. Furthermore, articles published before 2000 were traced to strengthen the theories. Results: Several monitoring devices had been reported to have respiratory gating purposes, but some were not equipped for this function. Furthermore, these devices were often developed using non-contact equipment, such as lasers and cameras, to provide accurate and precise measurements. One of their key advantages is the lack of physical attachment to the patients, thereby preserving comfort. The development of respiratory gating devices had significant potential to enhance the quality of radiotherapy treatment. This was manifested through more effective tumor and organ treatment and reduced toxicity. These benefits had the potential to extend the life expectancy of patients with respiratory-related cancer. Conclusions: Based on the results, respiratory gating was an advantageous technique in radiotherapy treatment. The development of respiratory gating devices enhanced patient comfort and the effectiveness of treatment.

IOP Conference Series: Earth and Environmental Science

Determination of diffusion coefficient using the Wiener method has shown a high level of agreemen... more Determination of diffusion coefficient using the Wiener method has shown a high level of agreement with literature in previous studies, particularly for liquids with a mass of less than hundreds of amu and a small molecule-sized order of Angstrom (atomic mass unit). This method involves a laser beam deflection and refraction phenomenon on the inter-diffusion zone of two fluids with different refractive indexes. Palm oil, vegetable oil with a composition and structure that is quite complicated and size relatively large molecule, has abundantly available and has become one of the primary raw materials for biodiesel production and cooking. This study used the method to examine the diffusivity of palm oil in n-hexane, which is still rare and hard to find, so challenging to be studied. A camera is used to catch the trace of a deflected laser beam on a screen after it passes through a diffusion cell in the measurement. This image was then corrected, made grey, and digitized to extract the...

Universitas Indonesia, 2012

2018 International Seminar on Intelligent Technology and Its Applications (ISITIA), 2018

In this research, an optical system is made and aims for Faraday rotation apparatus. This system ... more In this research, an optical system is made and aims for Faraday rotation apparatus. This system was designed and made to measure the rotation angle of plane of polarization on analyzer, light intensity, and value of magnetic field, where as the analyzer angle setting is done by using a stepper motor which connected to the lens of analyzer by a gear set, for the light intensity the writer measured it with a lux meter IC BH1750, and the magnetic field measured based on the current which given by constant current power supply. Number of pulses on the stepper motor and the data from the IC BH1750 is being acquired using a microcontroller. In this research, the writer used two variable wave length from different color on 30 watt LED as the light sources, all of these light sources are being controlled by the microcontroller. Based on this research, the writer conclude that there are transfer function (p= 17.832θ), where (θ) is the rotation angle of analyzer and (P) is the pulse that is ...

2017 International Seminar on Sensors, Instrumentation, Measurement and Metrology (ISSIMM), 2017

Recently, various studies have been proposed for mass transfer coefficient, mainly motivated by a... more Recently, various studies have been proposed for mass transfer coefficient, mainly motivated by a broad application such as oil transfer and liquid-liquid interdiffusion. On the other hand, increasing sensitivity and signal to noise ratio of conventional laser beam deflection measurement system is an interesting topic in structure material and instrumentation research. In this work, an enhanced laser beam deflection measurement system was constructed to determine the diffusion coefficient of liquid-liquid material, and it worked well based on the Wiener method. Sodium chloride aqueous solution and distilled water were poured in a glass cell abd then illuminated by the laser beam tilted 45° to the vertical, exhibiting a reflection of straight line light on the screen. The reflection pattern on screen was captured by camera and processed. Image processing and calculation have been completed to determine refractive index gradient and the diffusion coefficient. Furthermore, the diffusion coefficient of Sodium chloride is found to be in a good agreement with coefficient values specified in the literature.

PROCEEDINGS OF THE 4TH INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES (ISCPMS2018), 2019

Nowadays, a lot of research have been done about the diffusion process, generally motivated by th... more Nowadays, a lot of research have been done about the diffusion process, generally motivated by the diffusion process in oil and between liquids. In addition, improving the sensitivity and performance of laser beam deflection measurement system is an attractive subject in materials and instrumentation research. In this study, diffusion coefficient measurement system based on laser beam deflection has been developed to specify the diffusion coefficient of liquid-liquid material and well succeeded by following the Wiener experimental method. The Sodium chloride and water solution are poured into the diffusion cell and then illuminated by the laser beam that forms a line tilted 45° to the vertical. Image processing and measurement have been performed to specify the refractive index gradient and the diffusion coefficient. The diffusion coefficient of Sodium chloride is discovered to be in a good agreement with the literature.

PROCEEDINGS OF THE 4TH INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES (ISCPMS2018), 2019

Enhancing the solubility of n-type diketopyrrolopyrrole-dicyanovinyl molecules with hybrid siloxa... more Enhancing the solubility of n-type diketopyrrolopyrrole-dicyanovinyl molecules with hybrid siloxane group for solution-processable organic field-effect transistor

Journal of Physics: Conference Series, 2019

This study aimed to make in-house dynamic thorax phantom that simulate translational and rotation... more This study aimed to make in-house dynamic thorax phantom that simulate translational and rotational direction mimicking NSCLC target movement. In addition,this study also investigate dosimetric effect of target movement for several translational amplitude. This work used in-house dynamic thorax phantom based on CIRS Dynamic Thorax Phantom model 008A. This phantom simulated translation in superior-inferior direction, rotational in the anterior-posterior and left-right lateral plane to mimic human respiratory motion. It was designed and controlled by linear actuator motor, servo motor, Adafruit motor shield L293D and Arduino UNO R3. It was implemented to evaluate point dose of 3D-CRT, IMRT, VMAT technique and for 5 mm; 10 mm; 15 mm translational motion amplitude 90° rotational target motion amplitude. The GafChromic EBT 3 film was used as a dosimeter for point dose measurement. This in-house dynamic thorax phantom can mimicking NSCLC target movement for translational amplitude 5 ± 1 m...

AIP Conference Proceedings, 2017

EEG data acquisition system 32 channels based on Raspberry Pi with relative power ratio and brain... more EEG data acquisition system 32 channels based on Raspberry Pi with relative power ratio and brain symmetry index features

Reports of Practical Oncology and Radiotherapy

this article is available in open access under creative common attribution-non-commercial-no Deri... more this article is available in open access under creative common attribution-non-commercial-no Derivatives 4.0 international (cc BY-nc-nD 4.0) license, allowing to download articles and share them with others as long as they credit the authors and the publisher, but without permission to change them in any way or use them commercially

2017 International Seminar on Sensors, Instrumentation, Measurement and Metrology (ISSIMM)

Interdiffusion between two liquids with different refractive index measurement system has been ca... more Interdiffusion between two liquids with different refractive index measurement system has been carefully constructed by using laser beam deflection method. The deflection pattern comes from refraction of the beam when it enters the interface of two different refractive index liquids. The diffusion coefficient is determined by observing refractive index gradients of liquid-liquid on the interface. In this phenomenon, mass transfer from liquid to liquid plays an important role and described using the Fick's law. The diffusion experiments have been performed with NaCl-aqueous solution. Interestingly, we found the diffusion coefficient of NaCl in reasonably good agreement with coefficient values specified in the literature. With simple setup and data analysis, we believe that the measurement system can be used to observe mass transfer in liquid accurately.

International Journal of Power Electronics and Drive Systems (IJPEDS)

This study explores the numerical optimization of water turbine runner profile performance using ... more This study explores the numerical optimization of water turbine runner profile performance using a surface vorticity model algorithm. The turbine is designed on a laboratory scale and operates at a net head of 0.09 m, 400 rpm, and a water flow rate of 0.003 m3/s. The initial design of the turbine runner was optimized to minimize losses in the hydrofoil. The optimization algorithm is coded in MATLAB software to obtain the optimal stagger angle that will be used in the water turbine design. Furthermore, design validation was performed using computational fluid dynamics analysis ANSYS CFX to determine the water turbine performance. The settings used in ANSYS CFX include the reference pressure of 1 atm, turbulence model shear stress transport, and inlet boundary conditions using total pressure and static pressure outlet boundary conditions. The computational fluid dynamics analysis reveals that by optimizing the design, the efficiency of the water turbine increases by approximately 2.6%...

2020 10th Electrical Power, Electronics, Communications, Controls and Informatics Seminar (EECCIS), 2020

This research describes designsand calibration of drum collector and Analog-to-Digital Converters... more This research describes designsand calibration of drum collector and Analog-to-Digital Converters (ADC) of high voltage for nano-fiber electrospinning based on microcontroller systems. Electrospinning is commonly used to make nanofibers electrostatically which then produces nanofiber polymers with a diameter in the nanometer scale from a high voltage polymer solution. Compared to conventional technology, electrospinning is more versatile and efficient technique. However, several important parameters must be considered in solutions, control processes, and the environment. High voltage and collector instrument are required for applying electrospinning technique. Collectors have a significant effect on the productivity and the arrangement of nanofibers and the final structure. The rotation speed or RPM of the drum collector must be controlled to obtain the optimal nanofibrous membranes. Voltage control is also an important factor in this electrospinning technique, therefore it is necessary to control the applied high voltage. The microcontroller used in this system is Arduino nano. The hardware in this system consists of A4988 motor driver, high voltage, drum collector. Communication between the microcontroller and ADC uses the Serial Peripheral Interface (SPI). Serial communication with baud rate of 9600 was used for communication between the microcontroller and PC. The calibration transfer function of drum collector is y = 0.0048 + 0.0015 with R square is 0.999. The calibration transfer function of ADC is y = 3.10e-7 – 0.0003 with R square = 1. ADC calibration values used have also been successfully carried out with error of 0.347%.

Journal of Physics: Conference Series, 2020

The purpose of this study is to calibration a mechanical system of In-house Dynamic Thorax Phanto... more The purpose of this study is to calibration a mechanical system of In-house Dynamic Thorax Phantom so that it can be used as a dosimetry on the Radiotherapy Real-Time Position Management (RPM) technique. In order to ensure the RPM technique had properly function, we need to employ a quality control tool that represents moving objects on the human body. Inspired by the CIRS Dynamic Thorax Phantom model 008A, we developed an In-house Dynamic Thorax Phantom using three Nema-17 stepper motors with 200 steps in a cycle as a mechanical system. In addition, the first stepper motor was used to move objects in superior-inferior direction; the second one was used to move the RPM marker in anterior-posterior direction; while the third one was used to move objects in rotation. Calibration of mechanical system was performed by finding out the number of counts needed each direction. Especially for rotational system, they were calibrated with Optical Interrupt Device. The result of calibration of ...

2020 International Seminar on Intelligent Technology and Its Applications (ISITIA), 2020

This research describes the design and calibration of a microfluidic syringe pump-based microcont... more This research describes the design and calibration of a microfluidic syringe pump-based microcontroller systems. Micro-scale syringe pump systems are needed in the medical, sensor industries or research such as nano-fiber electrospinning [1]. The design of the syringe pump is modular and simple which facilitates the configuration of syringes and motors that are different so that they independent from each other between the syringe pump. The distance of each syringe pump can be adjusted from each other. The key issue here is how to make the syringe pump have flow with very high accuracy and precision. Each pump has a stepper motor that drives the lead screw, which in turn moves the sled (mounted on a linear ball bearing) which pushes (inserts) or pulls (sucks) the syringe. The gravimetric method is used to determine the volume and flow rate. The gravimetric method is the primary method used to determine flow and it consists of determining the mass delivered from the infusion pump in relation to time. The motor driver used to control the syringe pump uses a single Pololu A4988 stepper controller, which controls the stepper motor that drives the syringe pump. The microcontroller used in this system is Arduino nano. Communication between the microcontroller and PC uses serial communication with a baud rate of 9600. The calibration transfer function of a microfluidic syringe pump system is mathbfy=mathbf0.233x+mathbf3.10e−mathbf5\mathbf{y}=\mathbf{0.233x}+\mathbf{3.10e}-\mathbf{5}mathbfy=mathbf0.233x+mathbf3.10e−mathbf5 with R squared value is 1. The system flow-rate can be set up to 0.0043 mL/second or 15480 uL/hour with error 0,674%.

2020 10th Electrical Power, Electronics, Communications, Controls and Informatics Seminar (EECCIS), 2020

The design of measuring devices for ferroelectric properties needs to be developed to support res... more The design of measuring devices for ferroelectric properties needs to be developed to support research on the nature of ferroelectric materials such as hysteresis. An integrated system and a fully automatic hysteresis characterization process are needed along with the uncertainty of the measurement parameters obtained. Through this research, an instrumentation system was built which aims to trace the hysteresis curve of a sample with ferroelectric materials. High voltage is given to the ferroelectric sample that can be controlled to produce an electric field that can cause capacitance and polarization in the sample. Measurements of polarization data, electric fields and formation of hysterical curves generated by the samples were done in the LabVIEW application. The conclusion obtained from this research is piezo buzzer sample has a polarization characteristic that can be changed by adjusting the value of the electric field given through high voltage control.

2020 International Seminar on Intelligent Technology and Its Applications (ISITIA), 2020

Multiferroic material is rapidly developing based on the increase of publication in its keyword e... more Multiferroic material is rapidly developing based on the increase of publication in its keyword each year. Multiferroic is a material which has two or more ferroic properties; ferroelectric, ferromagnetic, and ferroelastic. In this research, we want to know whether magneto-electric multiferroic or a material that exhibits ferroelectricity and ferromagnetic can be affected by magnetic field. By designing an instrument that can measure change in relative permittivity to frequency when given a magnetic field then we can find out whether the material being tested is a magneto-electric multiferroic or not. Relative permittivity measurement result of piezoelectric sample is 18047–35254 at 100Hz-1kHz frequency range and 9524–18047 at 1kHz-10kHz frequency range. These results when affected by a magnetic field stay the same because piezoelectric is a ferroelectric material.

Key Engineering Materials, 2020

La0.7Ba0.25Nd0.05MnO3 (LBNMO) compounds were synthesized using two different methods, namely are ... more La0.7Ba0.25Nd0.05MnO3 (LBNMO) compounds were synthesized using two different methods, namely are solid-state reaction (SS) and sol-gel (SG). All samples were heat-treated at 1200 °C for 12 hours. The investigation on structural, morphological, and magnetic properties was carried out by X-Ray Diffractometer (XRD), Scanning Electron Microscope (SEM), and Vibrating Samples Magnetometer (VSM) at room temperature. From the Rietveld refinement, both samples have formed a rhombohedral structure with an R-3c (167) space group. The average crystallite size was calculated using the Scherrer formula and Williamson-Hall (W-H) method for comparison. It was shown that the crystallite size of the sample produced by the SG method has larger than the SS method. This result is fairly consistent with the result obtained from SEM analysis, which shows that the average grain for the SG sample is larger than of the grain of the SS samples. From the magnetic hysteresis curve, the magnetization saturation ...