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Application of free surface synthetic schlieren method in determining surface tension from a light floating object

Journal of physics: Conference Series 2019年第1期1380卷

作者： C Pathommapas S Yapo E Seesomboon N Pussadee Master's Degree Program in Teaching Physics Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Science Department Udomdarunee School Sukhothai 52000 Thailand Department of Mechanical Engineering Faculty of Engineering Chiang Mai University Chiang Mai 50200 Thailand Plasma and Beam Physics Research Facility Department of Physics and Materials Science Chiang Mai University Chiang Mai 50200 Thailand Thailand Center of Excellence in physics Commission on Higher Education 328 Si Ayutthaya Road Bangkok 10400 Thailand

Free surface synthetic schlieren (FS-SS) is a liquid surface topography visualization technique relying on apparent dot pattern displacement due to liquid surface deformation. It has gained attention in the fluid visualization field due to its relatively simple and inexpensive setup. One of the most powerful features of the FS-SS technique is the 3D topography of deformed liquid surface, in which submillimeter scale changes can be readily observed in great detail. The visualization of liquid meniscus at the solid interface is proposed in this study to calculate surface tension by equating the surface tension force with weight of light, floating object with circular geometry. It was found that surface tensions of liquids are much greater than anticipated, suggesting that the effect of buoyant force of displaced liquid due to deformed interface cannot be neglected. When the buoyant force is included, the calculated surface tension of liquids are within 10% of the reference values.

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Exterior cooling system effect on lesion size in radio frequency ablation using bipolar forceps probe 5

Exterior cooling system effect on lesion size in radio frequ...

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5th International Conference on Instrumentation, Control, and Automation, ICA 2017

作者： Aryadinata, I. Komang A. Giantra, Ardityo Akasum, Gina F. Suprijanto Engineering Physics Program Faculty of Industrial Technology ITB Bandung Indonesia Instrumentation and Control Master Program Faculty of Industrial Technology ITB Bandung Indonesia Instrumentation and Control Research Group Faculty of Industrial Technology ITB Bandung Indonesia

ISBN: (纸本)9781538603499

Radio frequency ablation has been used in many surgery procedures to disrupt the abnormalities in biological tissue. This procedure results in permanent damage to the tissue so there must not be any fault occur during the procedure. The common problem faced is the uneven distribution of necrotic tissue that led to a smaller lesion size. This paper proposed an experiment on exterior cooling system as an addition instrument to the basic radio frequency ablation instruments. This study was done to quantify the cooling effect of the external coil used. Cooling coil was supplied with cooled water at constant temperature and was set into several volume flow rates. The coil contacted to the surface of the tissue when ablation was executed. The ablation was done for a minute with bipolar forceps probe at some sections of cattle liver. Temperature measurement points of the tissue were observed during ablation time. The ablated tissues were cut and then the width and the height of the lesion were measured for analysis. The with-cooling coil experiment showed the maximum temperature reached was lower than the no-cooling coil experiment. The results showed that by using exterior cooling coil there were increases in the size of the lesions. The use of external cooling system as additional instrument is suitable for electrosurgery which objective is to enlarge the lesion size without reaching the charring condition. © 2017 IEEE.

关键词： Tissue

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Histopathology Grading Identification of Breast Cancer Based on Texture Classification Using GLCM and Neural Network Method

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Journal of physics: Conference Series 2018年第1期1120卷

作者： Riries Rulaningtyas Agoes Santika Hyperastuty Anny Setijo Rahaju Biomedical Engineering Study Program Department of Physics Airlangga University Jl. Mulyorejo Surabaya 60115 Indonesia Biomedical Engineering Master Program Airlangga University Jl. Mulyorejo Surabaya 60115 Indonesia Department of Pathology Anatomy Medical Faculty Airlangga University Jl. Mulyorejo Surabaya 60115 Indonesia

Breast cancer is the leading type of malignant tumor which is observed in women. The effective treatment depends on its early diagnosis. The gold standard of breast cancer is histopathologic examination of cancer cells. The determination of the grading in breast cancer is determined by three factors: pleomorphic, tubular formation and cell mitosis. This paper uses pleumorfic and tubular formation pattern from breast cell histopathology images. The proposed system consists of four major steps : preprocessing, segmentation, feature extraction and classification. We use k – means clustering method for image segmentation and use Gray level Cooccurence Matrix (GLCM) for feature extraction with four features (i.e. angular second moment, contrast feature, entropy feature, and variance feature). The final step is grading classification which uses Backpropagation Neural Network. Some of important parameters will be variated in this process such as learning rate and the number of node in hidden layer. The research gives good result for the identification of breast cancer grading with 88% accuracy, 85% sensitivity, and 80% specificity.

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A Study of Carteria sp. Cell Electrical Lysis in Straight and Tapered Microfluidic Systems

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Journal of physics: Conference Series 2018年第1期1144卷

作者： P Chimsiri K Masaen J Sanglao R Techapiesancharoenkij N Pussadee Master's Degree Program in Physics Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Department of Materials Engineering Faculty of Engineering Kasetsart University Bangkok 10900 Thailand Thailand Center of Excellent in Physics Commission on High Education 328 Si Ayutthaya Road Bangkok 10400 Thailand Plasma and Beam Physics Research Facility Department of Physics and Materials Science Chiang Mai University Chiang Mai 50200 Thailand

Electrical cell lysis is one of the most efficient techniques in cell analysis in extracting intracellular components for further use or examination. Cells are exposed to high electric field strength that can rupture cell membrane due to nano-size pores creation. Thanks to microfabrication technology, electrodes can be materialized in close proximity to each other leading to high electric field strength with low applied voltage. In this study, two microfluidic systems were designed: straight and tapered systems. The straight channel was chosen due to the ease of fabrication, while the tapered channel was picked since it intensifies electric field strength in the tapered area. Finite element method was used to simulate electric field distribution inside the microfluidic systems and transmembrane potential (TMP) across cell membrane. In the experiment, green algae Carteria sp. which contains large amount of lipid was used in performing microfluidic electrical cell lysis. For 30 nm thick gold planar electrodes with 110 μm spacing fabrication, the simulated TMPs produced in both microfluidic systems exceed 0.2 V which is a threshold potential for pore generation in cell membranes when applying 34 V p–p , 1000 Hz AC voltage. Only Carteria sp. cells were successfully lysed in straight microfluidic system after being exposed to high electric field strength for several minutes. Although electric field in the tapered region was higher than that of the straight microfluidic system, the cells were rushed out of the tapered region due to electrohydrodynamic effects.

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A Particle Detection Modeling of Non-contact Coplanar Differential Impedance Sensor in Microfluidic System

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Journal of physics: Conference Series 2018年第1期1144卷

作者： K Masaen J Sanglao P Chimsiri R Techapiesancharoenkij N Pussadee Master's Degree Program in Physics Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Department of Materials Engineering Faculty of Engineering Kasetsart University Bangkok 10900 Thailand Thailand Center of Excellence in Physics Commission on Higher Education 328 Si Ayutthaya Road Bangkok 10400 Thailand Plasma and Beam Physics Research Facility Department of Physics and Materials Science Chiang Mai University Chiang Mai 50200 Thailand Research Center in Physics and Astronomy Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand

Over the last few years, study of microfluidic flow cytometry using electrical signals has developed at a fast pace. There are several electrical detection congurations but differential impedance sensing offers a greater advantage due to its capability of cancelling common noise from the detected signal, resulting in improved signal to noise ratio. This paper presents the simulation of a differential impedance sensor by employing the finite element method to gain an insight and to find the proper range of the working excitation frequency for the detection system. A polystyrene microbead was used as a model particle flowing past the detection area that had non-contact excitation and two pickup coplanar electrodes in which an excitation electrode was positioned between the two pickup electrodes. The modeling results showed that for a 2 μm PDMS separation layer, the range of optimal excitation frequency was about 100 - 1000 Hz when DI water was a background medium. The bead size to microchannel height ratio was found to affect the sensitivity of detection, in which the closer the height ratio was to the unity ratio, the more current was detected. The results of the simulation study will be used in fabricating an actual device for microfluidic particle cytometry applications.

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Surface Water Wave Topography Construction using Free Surface Synthetic Schlieren Method for Demonstration of Ripple Tank Wave Phenomena

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Journal of physics: Conference Series 2018年第1期1144卷

作者： S Yapo E Seesomboon N Chattrapiban N Pussadee Master's Degree Program in Teaching Physics Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Department of Mechanical Engineering Faculty of Engineering Chiang Mai University Chiang Mai 50200 Thailand Department of Physics and Materials Science Chiang Mai University Chiang Mai 50200 Thailand Thailand Center of Excellence in Physics Commission on Higher Education 328 Si Ayutthaya Road Bangkok 10400 Thailand Research Center in Physics and Astronomy Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand

The ripple tank is a popular water wave phenomena demonstration tool for secondary school students. The projected wave images are observed in bright - dark patterns on a screen. This tool, however, falls short in presenting the amplitude of the waves which is another important parameter in explaining the wave phenomena. The free surface synthetic schlieren (FS-SS) method presents an immense technical tool for solving this problem. FS-SS is an optical method based on light refraction in determining the surface gradient field from the motion of a random dot pattern when the water surface is perturbed. The surface height of the wave is constructed using the inverse gradient operation on the displacement gradient field of the random dot pattern. In this work, Wave propagation, reflection, diffraction, and interference pattern surface construction were performed to visualize wave phenomena in 3D.

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Deformation monitoring of Pidie Jaya earthquake using pairwise logic of multitemporal Sentinel-1 SAR data

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AIP Conference Proceedings 2018年第1期1987卷

作者： Saumi Syahreza Hibban Hamka Siddieq Asep Saepuloh Irwan Mailano 1Department of Physics Syiah Kuala University (Unsyiah) 23111 Banda Aceh Indonesia 2Tsunami and Disaster Mitigation Research Center (TDMRC) Unsyiah Banda Aceh 23233 Indonesia 3Geothermal Engineering Master Program Bandung Institute of Technology (ITB) Indonesia 4Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Indonesia

Interferometric synthetic aperture radar (InSAR) based on radar satellite data has emerged as a powerful technology for observing the Earth’s surface, especially for monitoring the Earth’s topography and deformations. However, it is well known that the InSAR measurements are often significantly affected by the atmosphere. This paper applies the pairwise logic (PWL) and the Differential Interferometric Synthetic Aperture Radar (D-InSAR) technique using multitemporal SAR image from Sentinel-1A (S1A). The objective of this study was to investigate the possibility of using PWL in reducing atmospheric delay and improve the results in capturing the deformation signal from the artifact. We stacked twelve pairs of S1A data before and after the December 6, 2016, Mw 6.5 Pidie Jaya earthquake in Aceh, Indonesia. Multitemporal interferograms of S1A in ascending and descending orbits were used to obtain Line of Sight (LOS) motion maps. To generate the differential interferogram of the PWL, then the first and the second interferogram were computed by summation process. Next, the second interferogram was added with the third, until the last interferogram of D-InSAR data pairs. The final data pair summation produced six pairwise interferogram. The results indicated that the summation of interferogram can increase the deformation twice in the line of sight of the satellite which represents movement toward or away from the satellite (e.g. uplift or subsidence), and also eliminated positive and negative signals in the line of sight velocities, which represent the atmospheric phase delay. The PWL simplified the complexity of atmospheric correction in the D-InSAR processing by reducing atmospheric artifact and increasing the deformation signal.

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Rapid Detection of Oil Pollution in Soil by Using Laser-Induced Breakdown Spectroscopy

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Plasma Science and Technology 2016年第12期18卷 1186-1191页

作者： Ali KHUMAENI Wahyu Setia BUDI Asep Yoyo WARDAYA Rinda HEDWIG Koo Hendrik KURNIAWAN Department of Physics Faculty of Science and Mathematics Diponegoro University JI. Prof. Soedharto SH. Tembalang Semarang 50275 Indonesia Master Program in Energy School of Postgraduate Studies (SPS) Diponegoro University JI. Imam Barjo SH. Pleburan Semarang 50241 Indonesia Computer Engineering Department Bina Nusantara University K. H. Syahdan 9 Jakarta 11480 Indonesia Research Center of Maju Makmur Mandiri Foundation 40 Srengseng Raya Kembangan Jakarta Barat 11630 Indonesia

Detection of oil pollution in soil has been carried out using laser-induced breakdown spectroscopy（LIBS）. A pulsed neodymium-doped yttrium aluminum garnet（Nd：YAG） laser（1,064 nm, 8 ns, 200 mJ） was focused onto pelletized soil samples. Emission spectra were obtained from oil-contaminated soil and clean soil. The contaminated soil had almost the same spectrum profile as the clean soil and contained the same major and minor elements. However, a C–H molecular band was clearly detected in the oil-contaminated soil, while no C–H band was detected in the clean soil. Linear calibration curve of the C–H molecular band was successfully made by using a soil sample containing various concentrations of oil. The limit of detection of the C–H band in the soil sample was 0.001 mL/g. Furthermore, the emission spectrum of the contaminated soil clearly displayed titanium（Ti） lines, which were not detected in the clean soil. The existence of the C–H band and Ti lines in oil-contaminated soil can be used to clearly distinguish contaminated soil from clean soil. For comparison, the emission spectra of contaminated and clean soil were also obtained using scanning electron microscope-energy dispersive X-ray（SEM/EDX） spectroscopy,showing that the spectra obtained using LIBS are much better than using SEM/EDX, as indicated by the signal to noise ratio（S/N ratio）.

关键词： laser-induced breakdown spectroscopy LIBS oil pollution soil analysis C–H molecular band

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ML-EM reconstruction model including total variation for low dose PET high resolution data

ML-EM reconstruction model including total variation for low...

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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： Lucia B. Chávez-Rivera Leticia Ortega-Máynez José Mejía Boris Mederos Electrical Engineering Master Degree program with the Electrical Engineering Department University of Juarez Electrical Engineering Department University of Juarez Mexico Physics and Mathematics Department University of Juarez Mexico

Data acquired through the PET system tend to be very noisy, partly due to low radiation doses. In this paper, a new reconstruction strategy based on a combination of the MLEM and total variation (TV) is presented. A comparision between the MLEM and MLEM-TV algorithms for three numbers of counts were done: (1) at 15 M counts; (2) at 35 M counts; and (3) at 55 M counts. The proposed method MLEM-TV can yield better result for image reconstruction, having a higher ability than the MLEM method to recover the spatial distribution of the counts, at low number of counts. Furthermore, an adaptive regularization parameters are embedded within the method. Experimental results, for the performance evaluation using PET simulated data, demostrate the efficiency of the MLEM-TV reconstruction method proposed, significantly improving the image quality and accuracy from the first iteration of the method, in comparison with that obtained using MLEM. For each reconstruction model under investigation, studies on the effects of image quality were addressed, using the SSIM index. Simulations were addressed using the small mouse MOBY phantom with SimSet.

关键词： Image reconstruction Reconstruction algorithms Positron emission tomography Mathematical model TV Mice Phantoms

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Triaxial MMG investigation during FES-induced cycle movements

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Journal of physics: Conference Series 2016年第1期705卷

作者： M C Gelain G N Nogueira-Neto P Nohama P M Gewehr Master's student of Electrical Engineering and Industrial Informatics at UTFPR (Rehabilitation engineering laboratory phone: +55 (41) 3310-4489) Brazil PhD in Biomedical Engineering researcher and professor of Computer Engineering at Pontifícia Universidade Católica do Paraná (PUCPR) Brazil PhD in Biomedical Engineering researcher and full professor at the PPGTS stricto sensu program at Pontifícia Universidade Católica do Paraná (PUCPR) Brazil PhD in Medical Physics Bioengineering and professor of Biomedical engineering at UTFPR Brazil

Spinal cord injury is damage to the spinal cord that results in loss of functions, causes muscle, joint and bone deficits, moreover it increases the muscle tone level. FEScycling is an alternative rehabilitation process to conserve the musculoskeletal system affected by the injury in the functional state. The aim of this study is to get the legs bilaterally synchronized by FES and compare MMG signal responses. The preliminary protocol consists of five consecutive contractions. The first and the last contractions were discarded and the three intermediate contractions were analyzed. A ratio between MMG values of muscle responses during propulsion and return of pedalling phases was calculated for each cycle and each leg. The applied FES profile consisted of pulse and burst on time of 250 us and 5 ms and frequencies of 1000 Hz and 20 Hz, respectively. Results showed that greater MMG RMS values tend to occur during the propulsion phase than in the return phase. MMG Z axis of RLL and MMG X axis of LLL were the axes that presented the greatest ratios. The MMG RMS signal showed that greater values tend to occur during the propulsion phase than in the return phase of the same thigh.

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