Pub Date : 2019-10-31DOI: 10.31258/jkfi.16.2.87-90
R. Handayani, E. Taer
The Carbon electrodes made from areca husk biomass materials have been successfully prepared and characterized. Preparation of carbon electrodes start with the pre-carbonization process, destruction of pre-carbon samples by using Ball Milling and sieving carbon powder for resulting particle size of <53 µm. Pre-carbonized powder is chemically activated using a 0.5 M KOH activator and continued by pellet forming by using Hydraulic Press. The carbonization process was carried out at a temperature of 600 oC using N2 gas followed by physical activation by using CO2 gas with a temperature of 900 oC for 1.5 hours, 2 hours and 2.5 hours. Physical properties analyzed include density, morphological structure and elemental content. The electrochemical properties were analyzed using the cyclic voltammetry (CV) method. The best density analysis result after carbonization-activation is 0.664 in SP-2.5 sample. The highest specific capacitance as high as 17.9 F / g found in the SP-1.5 sample.
成功地制备了槟榔壳生物质材料的碳电极，并对其进行了表征。碳电极的制备从预炭化过程开始，通过球磨和筛分碳粉来破坏预碳样品，得到粒径<53µm的碳粉。预碳化的粉末使用0.5 M KOH活化剂进行化学活化，然后使用液压机进行球团成型。在600℃的N2条件下进行炭化，然后在900℃的CO2条件下进行1.5小时、2小时和2.5小时的物理活化。物理性质分析包括密度、形态结构和元素含量。采用循环伏安法(CV)对其电化学性能进行了分析。SP-2.5样品炭化活化后的最佳密度分析结果为0.664。在SP-1.5样品中发现的最高比电容高达17.9 F / g。
{"title":"PENGARUH WAKTU AKTIVASI TERHADAP SIFAT FISIS DAN ELEKTROKIMIA SEL SUPERKAPASITOR DARI SABUT PINANG","authors":"R. Handayani, E. Taer","doi":"10.31258/jkfi.16.2.87-90","DOIUrl":"https://doi.org/10.31258/jkfi.16.2.87-90","url":null,"abstract":"The Carbon electrodes made from areca husk biomass materials have been successfully prepared and characterized. Preparation of carbon electrodes start with the pre-carbonization process, destruction of pre-carbon samples by using Ball Milling and sieving carbon powder for resulting particle size of <53 µm. Pre-carbonized powder is chemically activated using a 0.5 M KOH activator and continued by pellet forming by using Hydraulic Press. The carbonization process was carried out at a temperature of 600 oC using N2 gas followed by physical activation by using CO2 gas with a temperature of 900 oC for 1.5 hours, 2 hours and 2.5 hours. Physical properties analyzed include density, morphological structure and elemental content. The electrochemical properties were analyzed using the cyclic voltammetry (CV) method. The best density analysis result after carbonization-activation is 0.664 in SP-2.5 sample. The highest specific capacitance as high as 17.9 F / g found in the SP-1.5 sample.","PeriodicalId":403286,"journal":{"name":"Komunikasi Fisika Indonesia","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122611085","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 : 2019-10-31DOI: 10.31258/jkfi.16.2.75-80
Yusiran Hikmat, E. Erwin
Design and experiment of ocean current power generation system have been carried out using the Bach Savonius rotor. In this research, the influence of the velocity of ocean currents, the number of turbine blades, and the blade arc angle of the generator output power are studied. The results showed that the turbine output power is strongly influenced by the velocity of ocean currents where the velocity values of ocean currents varied in the range 0,63-1,98 m/sec. The maximum elctrical power of the turbine occurs at a current velocity of 1,98 m/sec of 26,88 Watts. The number of turbine blades has a significant effect on turbine output power. The turbine reaches maximum power is found in the rotor with a number of 3 blades with a power coefficient of 0,1176 on the tip speed ratio of 0,359. The blade arc angle is varied at angles of 90˚, 135˚ and 165˚. The blade arc angle 135˚ gives the best performance with a power coefficient of 0,102 on the tip speed ratio of 0,298.
{"title":"STUDI EKSPERIMEN TEKNOLOGI PEMBANGKIT LISTRIK TENAGA ARUS LAUT (PLTAL) MENGGUNAKAN SAVONIUS BACH ROTOR","authors":"Yusiran Hikmat, E. Erwin","doi":"10.31258/jkfi.16.2.75-80","DOIUrl":"https://doi.org/10.31258/jkfi.16.2.75-80","url":null,"abstract":"Design and experiment of ocean current power generation system have been carried out using the Bach Savonius rotor. In this research, the influence of the velocity of ocean currents, the number of turbine blades, and the blade arc angle of the generator output power are studied. The results showed that the turbine output power is strongly influenced by the velocity of ocean currents where the velocity values of ocean currents varied in the range 0,63-1,98 m/sec. The maximum elctrical power of the turbine occurs at a current velocity of 1,98 m/sec of 26,88 Watts. The number of turbine blades has a significant effect on turbine output power. The turbine reaches maximum power is found in the rotor with a number of 3 blades with a power coefficient of 0,1176 on the tip speed ratio of 0,359. The blade arc angle is varied at angles of 90˚, 135˚ and 165˚. The blade arc angle 135˚ gives the best performance with a power coefficient of 0,102 on the tip speed ratio of 0,298.","PeriodicalId":403286,"journal":{"name":"Komunikasi Fisika Indonesia","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127740602","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 : 2019-10-31DOI: 10.31258/jkfi.16.2.107-112
W. Yulia, E. Erwin
Analisys of magnetic properties and structure of particles of iron sand of Arta, Pariaman beach West Sumatra. Has been conducted the iron sand samples were dried, then the iron sand separation process was carried out using Iron Sand Separator (ISS). Next, the sample was milled for 30, 60 and 90 hours. The separation between magnetic particles and non magnetic particles was done using Neodymium Iron Boron (NdFeB) magnet. Magnetic induction measurements were carried out using Pasco PS-2162 Magnetic Probe which measured the total magnetic induction of solenoid (solenoid with core sample and milled sample(consentrate II)) as a function of electric current of 1-8 A for a fixed distance of 1 mm. Identification of the content of elements contained in iron sand before and after processing with Ball Milling for 90 hours was carried out using X-Ray Fluorescence (XRF). The phase of magnetic particles processed by Ball Milling was determined using X-Ray Diffraction (XRD). The calculation results show that the magnetic susceptibility of the sample increases with increasing Ball Milling time, from (69426,19 × 10-5 – 80332,13 × 10-5). These values are in the interval 220 - 380.000 × 10-5of the Ilmenite mineral. The magnetite phase appears more than the maghemite phase and the hematite phase after Ball Milling for 90 hours. The particle size of magnetik particle decreases as milling time increase, this trend is confirmed by the result of XRD.
{"title":"ANALISIS SIFAT MAGNETIK DAN STRUKTUR PARTIKEL PASIR BESI PANTAI ARTA PARIAMAN SUMATERA BARAT MENGGUNAKAN BALL MILLING","authors":"W. Yulia, E. Erwin","doi":"10.31258/jkfi.16.2.107-112","DOIUrl":"https://doi.org/10.31258/jkfi.16.2.107-112","url":null,"abstract":"Analisys of magnetic properties and structure of particles of iron sand of Arta, Pariaman beach West Sumatra. Has been conducted the iron sand samples were dried, then the iron sand separation process was carried out using Iron Sand Separator (ISS). Next, the sample was milled for 30, 60 and 90 hours. The separation between magnetic particles and non magnetic particles was done using Neodymium Iron Boron (NdFeB) magnet. Magnetic induction measurements were carried out using Pasco PS-2162 Magnetic Probe which measured the total magnetic induction of solenoid (solenoid with core sample and milled sample(consentrate II)) as a function of electric current of 1-8 A for a fixed distance of 1 mm. Identification of the content of elements contained in iron sand before and after processing with Ball Milling for 90 hours was carried out using X-Ray Fluorescence (XRF). The phase of magnetic particles processed by Ball Milling was determined using X-Ray Diffraction (XRD). The calculation results show that the magnetic susceptibility of the sample increases with increasing Ball Milling time, from (69426,19 × 10-5 – 80332,13 × 10-5). These values are in the interval 220 - 380.000 × 10-5of the Ilmenite mineral. The magnetite phase appears more than the maghemite phase and the hematite phase after Ball Milling for 90 hours. The particle size of magnetik particle decreases as milling time increase, this trend is confirmed by the result of XRD.","PeriodicalId":403286,"journal":{"name":"Komunikasi Fisika Indonesia","volume":"29 21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115285160","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 : 2019-10-31DOI: 10.31258/jkfi.16.2.123-129
Ida Vaeruza, Kukuh Eka Kurniansyah, F. Darma, I. Yulianti
The presence of mercury ions is a serious threat to human health and environment. Water consumption containing mercury is very dangerous for human healt. The purpose of this work is to design a heavy metal sensor ion using plastic optical fiber to detect mercury ions in water. The sensor was fabricated by coating the optical fiber by chitosan through dip-coating technique. There are three diameter of optical fiber sensor that was fabricated, which are 1087.64 μm (sensor A), 1691.64 μm (sensor B) and 1736.33 μm (sensor C). Sensor characterization was done by connected the tip of plastic optical fiber to an LED and the other tip was connected to a photodioda. The results show that sensitivity of sample A is 0.32 mA/ppm, sample B is 0.56 mA/ppm and sample C is 0.64 mA/ppm. In terms of respone time, it is shown that thr respon time for sensor A, B and C are 22 s, 42.5 s and 86 s respectively.
{"title":"FABRIKASI SENSOR SERAT OPTIK PLASTIK UNTUK DETEKSI ION LOGAM MERKURI DALAM AIR","authors":"Ida Vaeruza, Kukuh Eka Kurniansyah, F. Darma, I. Yulianti","doi":"10.31258/jkfi.16.2.123-129","DOIUrl":"https://doi.org/10.31258/jkfi.16.2.123-129","url":null,"abstract":"The presence of mercury ions is a serious threat to human health and environment. Water consumption containing mercury is very dangerous for human healt. The purpose of this work is to design a heavy metal sensor ion using plastic optical fiber to detect mercury ions in water. The sensor was fabricated by coating the optical fiber by chitosan through dip-coating technique. There are three diameter of optical fiber sensor that was fabricated, which are 1087.64 μm (sensor A), 1691.64 μm (sensor B) and 1736.33 μm (sensor C). Sensor characterization was done by connected the tip of plastic optical fiber to an LED and the other tip was connected to a photodioda. The results show that sensitivity of sample A is 0.32 mA/ppm, sample B is 0.56 mA/ppm and sample C is 0.64 mA/ppm. In terms of respone time, it is shown that thr respon time for sensor A, B and C are 22 s, 42.5 s and 86 s respectively.","PeriodicalId":403286,"journal":{"name":"Komunikasi Fisika Indonesia","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123206259","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 : 2019-10-31DOI: 10.31258/jkfi.16.2.113-117
Reeky Fardinata, Saktioto Saktioto
Thermal equilibrium hydrogen plasma at atmospheric pressure were simulated using the software matrix laboratory (MATLAB). Runge Kutta method numerical method as a settlement of differensial model equations of chemical kibetik with the arrhenius equation approach and continuity equations so that the equilibrium density values for each species were obtained. Equilibrium hydrogen plasma at atmospheric pressure and density rate review every reaction involved. Parameter of ionizing and disasosiasi as a reference equilibrium plasma. Equilibrium plasma is found in time interval 10-6 – 10-3 s thermal hydrogen plasmas with temperatures of 1 eV. The density of hydrogen plasma thermal equilibrium overall are in the interval of 1014 m-3 - 1020 m-3 . The reaction rate of each species varies based on the type of collision and rate of change of species.
{"title":"PENENTUAN DENSITAS SPESIES PLASMA HIDROGEN PADA KESETIMBANGAN TERMODINAMIK TEKANAN ATMOSFIR MENGGUNAKAN MATLAB","authors":"Reeky Fardinata, Saktioto Saktioto","doi":"10.31258/jkfi.16.2.113-117","DOIUrl":"https://doi.org/10.31258/jkfi.16.2.113-117","url":null,"abstract":"Thermal equilibrium hydrogen plasma at atmospheric pressure were simulated using the software matrix laboratory (MATLAB). Runge Kutta method numerical method as a settlement of differensial model equations of chemical kibetik with the arrhenius equation approach and continuity equations so that the equilibrium density values for each species were obtained. Equilibrium hydrogen plasma at atmospheric pressure and density rate review every reaction involved. Parameter of ionizing and disasosiasi as a reference equilibrium plasma. Equilibrium plasma is found in time interval 10-6 – 10-3 s thermal hydrogen plasmas with temperatures of 1 eV. The density of hydrogen plasma thermal equilibrium overall are in the interval of 1014 m-3 - 1020 m-3 . The reaction rate of each species varies based on the type of collision and rate of change of species.","PeriodicalId":403286,"journal":{"name":"Komunikasi Fisika Indonesia","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122660348","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 : 2019-10-31DOI: 10.31258/jkfi.16.2.91-95
Sintha Syaputri, Z. Zulkarnain
Segmentation is the process of separating parts of objects from the background by dividing images that have different object intensities with each other such as in imaging of body parts. Active contour segmentation was used for medical imaging that resistant to noise around objects. This study used 5 chest X-Ray images, specifically to the lungs with a grayscale format measuring 256 x 256 pixels, through the preprocessing process and filtering a Gaussian filter, each image was inputted to the R2015a version of the matlab GUI program. Then the segmentation had done by using the active contour method. In this method a curve in the form of a small circle was placed on the edge of object to be segmented. The curve will move according to the shape of the outer edge of the lung based on the values of active contour parameters such as Alpha, Beta, Gamma, Kappa, WEline, WEdge, WEterm and Iteration. Validation was done by using the ROC (Receiver Operating Characteristic) method and were obtained an average percentage with an accuracy value of 96.26%, a specificity of 96.47% and a sensitivity of 76.54%.
{"title":"SEGMENTASI CITRA PARU-PARU MENGGUNAKAN METODE KONTUR AKTIF DENGAN VALIDASI ROC","authors":"Sintha Syaputri, Z. Zulkarnain","doi":"10.31258/jkfi.16.2.91-95","DOIUrl":"https://doi.org/10.31258/jkfi.16.2.91-95","url":null,"abstract":"Segmentation is the process of separating parts of objects from the background by dividing images that have different object intensities with each other such as in imaging of body parts. Active contour segmentation was used for medical imaging that resistant to noise around objects. This study used 5 chest X-Ray images, specifically to the lungs with a grayscale format measuring 256 x 256 pixels, through the preprocessing process and filtering a Gaussian filter, each image was inputted to the R2015a version of the matlab GUI program. Then the segmentation had done by using the active contour method. In this method a curve in the form of a small circle was placed on the edge of object to be segmented. The curve will move according to the shape of the outer edge of the lung based on the values of active contour parameters such as Alpha, Beta, Gamma, Kappa, WEline, WEdge, WEterm and Iteration. Validation was done by using the ROC (Receiver Operating Characteristic) method and were obtained an average percentage with an accuracy value of 96.26%, a specificity of 96.47% and a sensitivity of 76.54%.","PeriodicalId":403286,"journal":{"name":"Komunikasi Fisika Indonesia","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123383237","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 : 2019-10-31DOI: 10.31258/jkfi.16.2.130-137
Asnawi Husin, Buldan Muslim
Medium Scale Travelling Ionospheric Disturbance (MSTID), thought to be manifestation of atmospheric gravity wave (AGW) in the ionospheric altitude that propagates horizontally and effects on in the electron density structure of ionosphere. These atmospheric gravity waves sourced from lower atmospheric activities such as typhoons, volcanic eruptions and tsunamis. Wave energy by its coupling induction process can travel to the ionosphere region. It has been understood that the TID's wave structure have an impact on the propagation of radio waves in the ionosphere so that it will affect the performance of navigation satellite-based positioning measurements. Based on Aceh tsunami in December 2004, this study aimed to investigation of the induction of atmospheric gravity waves in the ionosphere using total electron content (TEC) data from the Sumatra GPS network (Sumatra GPS Array, SUGAR). The detection technique of TEC changes due to AGW induction with a filter to separate medium scale disturbance at the ionospheric pierce point at an altitude of 350 km (IPP, Ionospheric Pierce Point). The results show the horizontal wavelength of a medium-scale TID around 180 ± 12 Km with a velocities of around 376 ± 9 ms-1. Based on two-dimensional map, the TID moves to the southeast.
{"title":"EFEK GELOMBANG TSUNAMI ACEH 2004 PADA GANGGUAN IONOSFER BERGERAK SKALA MENENGAH DARI PENGAMATAN JARINGAN GPS SUMATRA","authors":"Asnawi Husin, Buldan Muslim","doi":"10.31258/jkfi.16.2.130-137","DOIUrl":"https://doi.org/10.31258/jkfi.16.2.130-137","url":null,"abstract":"Medium Scale Travelling Ionospheric Disturbance (MSTID), thought to be manifestation of atmospheric gravity wave (AGW) in the ionospheric altitude that propagates horizontally and effects on in the electron density structure of ionosphere. These atmospheric gravity waves sourced from lower atmospheric activities such as typhoons, volcanic eruptions and tsunamis. Wave energy by its coupling induction process can travel to the ionosphere region. It has been understood that the TID's wave structure have an impact on the propagation of radio waves in the ionosphere so that it will affect the performance of navigation satellite-based positioning measurements. Based on Aceh tsunami in December 2004, this study aimed to investigation of the induction of atmospheric gravity waves in the ionosphere using total electron content (TEC) data from the Sumatra GPS network (Sumatra GPS Array, SUGAR). The detection technique of TEC changes due to AGW induction with a filter to separate medium scale disturbance at the ionospheric pierce point at an altitude of 350 km (IPP, Ionospheric Pierce Point). The results show the horizontal wavelength of a medium-scale TID around 180 ± 12 Km with a velocities of around 376 ± 9 ms-1. Based on two-dimensional map, the TID moves to the southeast.","PeriodicalId":403286,"journal":{"name":"Komunikasi Fisika Indonesia","volume":"196 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123226376","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 : 2019-10-31DOI: 10.31258/jkfi.16.2.143-148
JR Lessy Eka Putri, M. Minarni, Feri Candra, H. Herman
The hyperspectral imaging method has been widely and intensively used in agriculture to find out various problems that occur in plants. Image processing is very important step in an imaging method. This research aims to create Matlab based program to be used to analyze the leaf image of oil palm plants that has experienced water deficiency. Reflectance intensity values were extracted from the process. The hyperspectral imaging system consisted of a 650 nm diode laser, a spectrograph, monochrome CMOS camera, and Matlab image processing program. The samplesused were 8 month old Tenera variety of oil palm seedlings which were treated to simulate water deficiency in the form of variations in the volume of water, namely 0 mL (without watering), 1000 mL, 2000 mL, and 3000 mL (normal), 3 duplicates for each volume. The samples were given water volume of 1000 mL and 2000 mL for every 7 days in 21 days, while the sampleswith 3000 mL of water were watered every day. Image recording was done on the 21st day for detached leaves at the the bottom part.The results showed that the Matlab program was able to separate each row from 15 images, each of which had a pixel size of 1280 × 1024 and merge each of the same lines into 1024 images with a pixel size of 1280 × 15. The reflectance intensity values were then obtained. The results showed that higher levels of water deficiency in plants produce increasing reflectance intensity values.
{"title":"ANALISA CITRA HIPERSPEKTRAL DAUN DARI TANAMAN KELAPA SAWIT YANG MENGALAMI KEKURANGAN AIR MENGGUNAKAN PROGRAM MATLAB","authors":"JR Lessy Eka Putri, M. Minarni, Feri Candra, H. Herman","doi":"10.31258/jkfi.16.2.143-148","DOIUrl":"https://doi.org/10.31258/jkfi.16.2.143-148","url":null,"abstract":"The hyperspectral imaging method has been widely and intensively used in agriculture to find out various problems that occur in plants. Image processing is very important step in an imaging method. This research aims to create Matlab based program to be used to analyze the leaf image of oil palm plants that has experienced water deficiency. Reflectance intensity values were extracted from the process. The hyperspectral imaging system consisted of a 650 nm diode laser, a spectrograph, monochrome CMOS camera, and Matlab image processing program. The samplesused were 8 month old Tenera variety of oil palm seedlings which were treated to simulate water deficiency in the form of variations in the volume of water, namely 0 mL (without watering), 1000 mL, 2000 mL, and 3000 mL (normal), 3 duplicates for each volume. The samples were given water volume of 1000 mL and 2000 mL for every 7 days in 21 days, while the sampleswith 3000 mL of water were watered every day. Image recording was done on the 21st day for detached leaves at the the bottom part.The results showed that the Matlab program was able to separate each row from 15 images, each of which had a pixel size of 1280 × 1024 and merge each of the same lines into 1024 images with a pixel size of 1280 × 15. The reflectance intensity values were then obtained. The results showed that higher levels of water deficiency in plants produce increasing reflectance intensity values.","PeriodicalId":403286,"journal":{"name":"Komunikasi Fisika Indonesia","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123140342","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 : 2019-10-31DOI: 10.31258/jkfi.16.2.81-86
Kristin - Natalia, E. Taer
The carbon electrode from acacia leaves (Acacia mangium Wild) for supercapacitor cell has been fabricated with physical activation temperature variations of 800oC, 850oC, and 900oC for the AK800, AK850 and AK900 samples respectively. Carbon electrodes were carbonized at a temperature of 600oC followed by physical activation in CO2 gas atmosphere. The KOH is use as an activating agent. The results of physical properties characterization show the higher physical activation temperature cause lower density data and smaller pore size of the particles. The EDX data shows an increasing in the carbon content. The best specific capacitance was found in AK900 as high as 76 g F-1 and the lowest specific capacitance is found in AK800 as high as 12,4 g F-1. Specific capacitance increases with increasing physical activation temperature.
在AK800、AK850和AK900样品的物理活化温度分别为800℃、850℃和900℃的条件下，制备了用相思叶(acacia mangium Wild)制备的超级电容器用碳电极。碳电极在600℃的温度下碳化，然后在CO2气氛中进行物理活化。KOH被用作活化剂。物理性质表征结果表明，物理活化温度越高，颗粒的密度数据越低，孔隙尺寸越小。EDX数据显示碳含量在增加。AK900的最佳比电容高达76 g F-1, AK800的最低比电容高达12.4 g F-1。比电容随物理活化温度的升高而增大。
{"title":"PENGARUH SUHU AKTIVASI TERHADAP SIFAT FISIS DAN ELEKTROKIMIA ELEKTRODA SUPERKAPASITOR DARI LIMBAH DAUN AKASIA (Acacia mangium Wild)","authors":"Kristin - Natalia, E. Taer","doi":"10.31258/jkfi.16.2.81-86","DOIUrl":"https://doi.org/10.31258/jkfi.16.2.81-86","url":null,"abstract":"The carbon electrode from acacia leaves (Acacia mangium Wild) for supercapacitor cell has been fabricated with physical activation temperature variations of 800oC, 850oC, and 900oC for the AK800, AK850 and AK900 samples respectively. Carbon electrodes were carbonized at a temperature of 600oC followed by physical activation in CO2 gas atmosphere. The KOH is use as an activating agent. The results of physical properties characterization show the higher physical activation temperature cause lower density data and smaller pore size of the particles. The EDX data shows an increasing in the carbon content. The best specific capacitance was found in AK900 as high as 76 g F-1 and the lowest specific capacitance is found in AK800 as high as 12,4 g F-1. Specific capacitance increases with increasing physical activation temperature.","PeriodicalId":403286,"journal":{"name":"Komunikasi Fisika Indonesia","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116347362","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 : 2019-10-31DOI: 10.31258/jkfi.16.2.118-122
Siti Alifah, Saktioto Saktioto
The density and reaction rate values of plasma are physical quantities needed to produce plasma hydrogen. Both are needed to estimate the heat and the operating time of plasma generator. Density and reaction rate of plasma values are obtained by computational modeling using the continuity and Arrhenius equation. Five spesies of hydrogen are used in this research i.e electron, H2, H2+, H and H+. The pressure used was 9.7 mTorr and the temperature of electron used is higher than the temperatures of the hydrogen species. The temperatures scale used in high at 34812 Kelvin for electron and 9283.2 for other species. The study resulted that hydrogen gas can be plasma when it reaches the time span 3.8x10-7second. The equilibrium conditions last for 10-3 second after the time limit be returned as plasma gas. The result of density for each species at range 1016 until 1018 m-3. The value of the fastest reaction rate equal to 7,3 x 1053 m-3 s-1.
{"title":"KEBERGANTUNGAN TEMPERATUR PLASMA HIDROGEN DALAM TEKANAN RENDAH","authors":"Siti Alifah, Saktioto Saktioto","doi":"10.31258/jkfi.16.2.118-122","DOIUrl":"https://doi.org/10.31258/jkfi.16.2.118-122","url":null,"abstract":"The density and reaction rate values of plasma are physical quantities needed to produce plasma hydrogen. Both are needed to estimate the heat and the operating time of plasma generator. Density and reaction rate of plasma values are obtained by computational modeling using the continuity and Arrhenius equation. Five spesies of hydrogen are used in this research i.e electron, H2, H2+, H and H+. The pressure used was 9.7 mTorr and the temperature of electron used is higher than the temperatures of the hydrogen species. The temperatures scale used in high at 34812 Kelvin for electron and 9283.2 for other species. The study resulted that hydrogen gas can be plasma when it reaches the time span 3.8x10-7second. The equilibrium conditions last for 10-3 second after the time limit be returned as plasma gas. The result of density for each species at range 1016 until 1018 m-3. The value of the fastest reaction rate equal to 7,3 x 1053 m-3 s-1. ","PeriodicalId":403286,"journal":{"name":"Komunikasi Fisika Indonesia","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125216004","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}
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