Positron Pub Date : 2023-11-30 DOI: 10.26418/positron.v13i2.69410

Romi Fadli Syahputra, N. Aisah, Delovita Ginting, Debi Yana, Ropiqotul Husna, Neneng Fitrya, Iwantono Iwantono, Saktioto Saktioto

{"title":"Perancangan dan Simulasi Sensor Volume Zat Cair berbasis Metamaterial Rektangular","authors":"Romi Fadli Syahputra, N. Aisah, Delovita Ginting, Debi Yana, Ropiqotul Husna, Neneng Fitrya, Iwantono Iwantono, Saktioto Saktioto","doi":"10.26418/positron.v13i2.69410","DOIUrl":"https://doi.org/10.26418/positron.v13i2.69410","url":null,"abstract":"Pengukuran volume zat cair yang sensitif dapat dicapai menggunakan alat ukur atau sensor. Akan tetapi sensor volume zat cair tidak banyak mengembangkan, padahal pengukuran volume berdampak langsuang pada nilai ekonomis, keberhasilan penelitian ilmiah, dan kemanjuran dosis obat. Penelitian yang telah dilakukan hanya sebatas pada pengukuran pada kenaikan permukaan zat cair dalam kenaikan tandon. menggunakan sensor fotodioda. Metamaterial telah banyak dikembangakan sebagai sistem sensor yang sensitif karena berbasis gelombang elektromagnetik, namun belum spesifik mengkajinya sebagai sensor volume zat cair. Tujuan penelitian ini adalah untuk merancang dan menyimulasikan penggunaan sensor metamaterial yang sensitif dalam pengukuran volume zat cair. Sensor didesain dengan prinsip split ring resonator berbentuk rektangular (SRR-R) yang terdiri dari cincin logam tembaga dan substrat FR4-Epoxy. Sensor SRR-R disimulasikan pada rentang frekuensi 350-850 MHz untuk mendeteksi perubahan volume zat cair (aquades, air tawar dan etanol) dari 5 - 44 ml. Hasil simulasi menunjukan terjadinya pergeseran frekuensi resonan spektrum S21 yang jelas untuk masing-masing zat cair. Pergeseraan frekuensi resonan untuk sampel aquades terjadi pada frekuensi 403 – 527 MHz, air tawar 403 – 528 MHz, dan etanol 60 – 783 MHz. Distribusi medan E dan medan H menunjukan nilai maksimum sebesar 18662 V. dan 43771 A. . Karakteristik kurva linier terjadi dalam rentang volume 12-44 ml untuk semua sampel zat cair. Sensor metamaterial SRR-R berhasil disimulasikan untuk mendeteksi perubahan volume zat cair dengan sensitivitas pengukuran aquades -1.3999 MHz/ml, air tawar -2.6833 MHz/ml, adan etanol -3.5685 MHz/ml.","PeriodicalId":31789,"journal":{"name":"Positron","volume":"60 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139205833","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}

引用次数: 0

Degradasi Rhodamin B oleh Bi4Ti3O12 yang Diperoleh dari Metode Lelehan Garam Campuran NaCl/KCl NaCl/KCl 混合盐熔融法制备的 Bi4Ti3O12 对罗丹明 B 的降解作用

Positron Pub Date : 2023-11-30 DOI: 10.26418/positron.v13i2.69085

Syilfia Ainur Rohmah Bashofi, A. Prasetyo

{"title":"Degradasi Rhodamin B oleh Bi4Ti3O12 yang Diperoleh dari Metode Lelehan Garam Campuran NaCl/KCl","authors":"Syilfia Ainur Rohmah Bashofi, A. Prasetyo","doi":"10.26418/positron.v13i2.69085","DOIUrl":"https://doi.org/10.26418/positron.v13i2.69085","url":null,"abstract":"Rhodamin B adalah salah satu limbah zat warna yang berbahaya bagi ekosistem sehingga diperlukan usaha-usaha untuk menanganinya. Salah satu metode yang berpotensi digunakan dalam menangani limbah rhodamin B adalah metode fotokatalis. Salah satu senyawa yang mempunyai kemampuan aktivitas fotokatalis yang baik adalah senyawa Bi4Ti3O12 dengan partikel bermorfologi plate-like/sheets. Salah satu metode sintesis yang dapat menghasilkan Bi4Ti3O12 bermorfologi plate-like/sheets adalah metode lelehan garam. Dalam penelitian ini telah disintesis Bi4Ti3O12 dengan metode lelehan garam campuran KCl/NaCl dan selanjutnya dilakukan uji degradasi rhodamin B. Difraktogram senyawa produk menunjukkan bahwa senyawa target Bi4Ti3O12 telah berhasi disintesis akan tetapi masih ditemukan sedikit pengotor berupa TiO2 (rutil). Mikrograf menunjukkan bahwa senyawa produk mempunyai morfologi plate-like/sheets, dengan ukuran partikel pada rentang 2-6 μm. Hasil perhitungan spektrum reflektan dengan menggunakan persamaan Kubelka-Munk menunjukkan bahwa energi celah pita Bi4Ti3O12 adalah 2,88 eV. Hasil uji kemampuan degradasi menunjukkan bahwa rhodamin B mengalami penurunan konsentrasi pada rentang 39,84% sampai 50,61% dalam waktu 60 menit.","PeriodicalId":31789,"journal":{"name":"Positron","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139199533","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}

引用次数: 0

Non-Nutritive Suck Assessment Tool Development to Characterize Sucking Patterns in Infant with Various Hunger Levels 开发非营养性吸吮评估工具，描述不同饥饿程度婴儿的吸吮模式

Positron Pub Date : 2023-11-30 DOI: 10.26418/positron.v13i2.69270

Casmika Saputra, Iin Inati

{"title":"Non-Nutritive Suck Assessment Tool Development to Characterize Sucking Patterns in Infant with Various Hunger Levels","authors":"Casmika Saputra, Iin Inati","doi":"10.26418/positron.v13i2.69270","DOIUrl":"https://doi.org/10.26418/positron.v13i2.69270","url":null,"abstract":"Sucking abilities are critical in early infant development, and the patterns of non-nutritive suck (NNS) have been found to potentially predict neurodevelopmental issues in the future. Proper NNS assessments are essential to ensure valid conclusions. Previous studies have shown that the level of infant arousal significantly affects NNS patterns. However, the author did not find any studies that observed the influence of infant hunger levels on NNS patterns. Therefore, this study aimed to develop an NNS assessment tool to characterize NNS patterns in infants with various hunger levels. The NNS assessment was conducted using a pressure transducer connected to a pacifier. The results showed that the level of hunger significantly affected the intra-burst frequency and the sucking pressure. The more hungry the infant, the more frequent the intra-burst frequency became, while the sucking pressure tended to decrease. The intra-burst frequency of infant sucking was 2.3, 2.46, and 2.5 Hz on average for a relative hunger index of 0.67, 0.83, and 1.0, respectively. The NNS pressure of infant sucking was 6.31, 4.51, and 2.62 kPa on average for a relative hunger index of 0.67, 0.83, and 1.0, respectively. This study's results suggest that during NNS assessments, the measurement time should consider the next feeding schedule for the infant.","PeriodicalId":31789,"journal":{"name":"Positron","volume":"166 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139204537","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}

引用次数: 0

Rancang Bangun Transduser Piezoelektrik untuk Analisis Target Strength Argo Float 用于 Argo 浮漂目标强度分析的压电传感器设计

Positron Pub Date : 2023-11-30 DOI: 10.26418/positron.v13i2.57340

H. Manik, A. K. Negara, S. Susilohadi

{"title":"Rancang Bangun Transduser Piezoelektrik untuk Analisis Target Strength Argo Float","authors":"H. Manik, A. K. Negara, S. Susilohadi","doi":"10.26418/positron.v13i2.57340","DOIUrl":"https://doi.org/10.26418/positron.v13i2.57340","url":null,"abstract":"Deteksi bawah air menggunakan teknologi akustik kelautan merupakan bagian dari metode penginderaan jauh. Hal ini disebabkan karena gelombang akustik mampu merambat di dalam air dengan baik. Salah satu faktor penting dalam pendeteksian dengan metode akustik adalah transduser sebagai Source Level pada sebuah sonar aktif. Metode penelitian dilakukan dengan membuat desain simulasi beamforming mengunakan aplikasi sensor array analyzer pada Matlab 2018 untuk menghasilkan parameter transduser dengan mode array. Parameter yang dihasilkan dari hasil simulasi digunakan sebagai referensi pembuatan transduser piezoelektrik (PZT). Prototipe transduser diberi sinyal trigger berupa beberapa ping atau burst dari sebuah driver akustik dan selanjutnya dilaksanakan uji coba memancarkan sinyal untuk mendeteksi target bawah air. Data echo yang direkam kemudian dilakukan pemrosesan sinyal sehingga hasil-hasil akhir prototipe sonar aktif mampu menghasilkan beamforming dengan beamdwidth 23,87 pada frekuensi 58,5 kHz, dengan Source Level (SL) sebesar 157,81 dB. Instrumen telah berhasil mendeteksi target argo float di kolom air dengan berbagai sudut yang berbeda. Nilai hasil deteksi Target Strength argo float maksimal sebesar –7,9 dB pada sudut 90 dan minimum sebesar –19,8 dB pada sudut 0.","PeriodicalId":31789,"journal":{"name":"Positron","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139206707","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}

引用次数: 0

Analysis of Projected Temperature Changes in Aceh Province 亚齐省气温变化预测分析

Positron Pub Date : 2023-11-30 DOI: 10.26418/positron.v13i2.60389

Yopi Ilhamsyah, Yustya Rahmy, Marwan Marwan, Kadarsah Kadarsah

{"title":"Analysis of Projected Temperature Changes in Aceh Province","authors":"Yopi Ilhamsyah, Yustya Rahmy, Marwan Marwan, Kadarsah Kadarsah","doi":"10.26418/positron.v13i2.60389","DOIUrl":"https://doi.org/10.26418/positron.v13i2.60389","url":null,"abstract":"The objective is to analyse temperature changes and their future projection in Aceh. The activities consist of collecting past and future temperature data, preparing materials for processing, and analyzing past and future temperature data (climate change projections). The data used are monthly average temperature data from data global climate model, e.g., csiromk3.6-hist-1986-2005-tas, csiromk3.6-rcp45- 2016-2035-tas, csiromk3.6-rcp45-2046-2065-tas, csiromk3.6-rcp45-2081-2100- tas, csiromk3.6-rcp85-2016-2035-tas, csiromk3.6-rcp85-2046-2065-tas, and csiromk3.6-rcp85-2081-2100-tas. The study began with reading climate data in NetCDF format using GRADS software, data processing using CDO software, providing a coordinate system using QGIS software, making climate change projection maps using ArcGIS software, and making climate change graphs using spreadsheet programs. Two scenarios, i.e., RCP4.5 and RCP8.5 are used to analyse the projected temperature changes in the short-term (2016 – 2035), medium-term (2046-2065), and long-term (2081-2100). The results show that the RCP4.5 projection shows a lower change in temperature rise than the RCP 8.5. A change in a temperature rise of up to 5°C was found in the RCP8.5 scenario.","PeriodicalId":31789,"journal":{"name":"Positron","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139198937","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}

引用次数: 0

Effect of Calcination Temperature on the Powder of Freshwater Snail Shells (Sulcospira testudinaria) Properties 煅烧温度对淡水螺壳（Sulcospira testudinaria）粉末特性的影响

Positron Pub Date : 2023-11-30 DOI: 10.26418/positron.v13i2.70055

Bintoro Siswo Nugroho, D. Wahyuni, A. Asri, Usliana Mustafa

{"title":"Effect of Calcination Temperature on the Powder of Freshwater Snail Shells (Sulcospira testudinaria) Properties","authors":"Bintoro Siswo Nugroho, D. Wahyuni, A. Asri, Usliana Mustafa","doi":"10.26418/positron.v13i2.70055","DOIUrl":"https://doi.org/10.26418/positron.v13i2.70055","url":null,"abstract":"Gastropod shells, such as those from the freshwater snail (Sulcospira testudinaria), have garnered interest as potential sources of calcium precursors. These shells are rich in calcium carbonate (CaCO3), which can be thermally decomposed into calcium oxide (CaO) through calcination. However, more information is needed on optimizing calcium extraction from the Sulcospira testudinaria (SST) shells. This study aims to investigate the influence of calcination temperature on the characteristics of powder of these shells. The study involves two sample treatments: uncalcined shells and shells calcined at temperatures ranging from 500°C to 1100°C for 1 hour. Fourier transform infrared spectroscopy (FTIR) analysis of uncalcined shell powder revealed the presence of aragonite functional groups within the CaCO3 structure. X-ray diffraction (XRD) analysis provided insights into the transformation of crystalline phases of CaCO3, starting from aragonite to calcite and eventually to calcium oxide, explaining the material's weight loss during calcination. The conversion of aragonite to calcite occurs between 500°C and 700°C, while optimal decomposition into CaO is achieved at 1000°C. X-ray fluorescence (XRF) analysis indicated reduced impurities in the samples post-calcination. Scanning electron microscopy (SEM) detailed the morphological characteristics of the shell powders, highlighting temperature-dependent surface features. In conclusion, the optimal calcination temperature for extracting calcium from SST shells is 1000°C. The resulting calcium oxide can be a valuable precursor for various material applications. This research contributes to the efficient utilization of biowaste resources, emphasizing the potential of freshwater snail shells in the sustainable production of calcium-derived materials.","PeriodicalId":31789,"journal":{"name":"Positron","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139201660","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}

引用次数: 0

Characteristics of Internal Solitary Waves near Its Generation Site in the Lombok Strait, Indonesia 印度尼西亚龙目海峡内孤波发生点附近的内孤波特征

Positron Pub Date : 2023-11-30 DOI: 10.26418/positron.v13i2.61621

A. Purwandana, Edikusmanto Edikusmanto, P. Utari, Hilda Lestiana, Okta Fajar Saputra, Qurnia Wulan Sari

{"title":"Characteristics of Internal Solitary Waves near Its Generation Site in the Lombok Strait, Indonesia","authors":"A. Purwandana, Edikusmanto Edikusmanto, P. Utari, Hilda Lestiana, Okta Fajar Saputra, Qurnia Wulan Sari","doi":"10.26418/positron.v13i2.61621","DOIUrl":"https://doi.org/10.26418/positron.v13i2.61621","url":null,"abstract":"Evidence of internal solitary waves (ISWs) formation through the Lee wave mechanism in the Lombok Strait was revealed from the echosounder measurements conducted in November 2017. This study is aimed to characterize the property of ISW packet formed around ~30 km away from the generation site, in the southern part of the strait above the Nusa Penida Sill (NPS), by employing Korteweg-de Vries (KdV) solution. The packet can be categorized as the early stage of ISW formation, consisting of two waves of depression, with typical amplitude of 30 m and 10 m, for the first and second wave, respectively. The waves propagated northward with a typical phase speed of ~1.2 m∙s -1. The waves drive a maximum horizontal velocity anomaly of ~0.8 m∙s - 1 and a vertical velocity anomaly of ~10 cm∙s -1. The amplitude of the ISW packet will be potentially amplified during their propagation away from the strait. This study provides an observational based understanding on the early stage of internal tides evolution in the Lombok Strait, particularly highlights the energy transfer of internal tides through the propagation of internal solitary waves.","PeriodicalId":31789,"journal":{"name":"Positron","volume":" 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139197684","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}

引用次数: 0

Kajian Numerik Kesalahan Hasil Pengukuran Geolistrik 2D Terhadap Target Model 3D: Studi Kasus Pengukuran di Dekat Gedung Berpondasi Beton 二维地电测量结果与三维目标模型误差的数值研究：混凝土地基建筑物附近的测量案例研究

Positron Pub Date : 2023-11-30 DOI: 10.26418/positron.v13i2.59023

Eddy Hartantyo

{"title":"Kajian Numerik Kesalahan Hasil Pengukuran Geolistrik 2D Terhadap Target Model 3D: Studi Kasus Pengukuran di Dekat Gedung Berpondasi Beton","authors":"Eddy Hartantyo","doi":"10.26418/positron.v13i2.59023","DOIUrl":"https://doi.org/10.26418/positron.v13i2.59023","url":null,"abstract":"Survei geolistrik 2D dikaji berdasarkan asumsi bahwa model geolistrik bawah permukaan yang dihadapi adalah model 2D, dimana tidak terdapat variasi nilai resistivitas pada horisontal arah tegak lurus lintasan. Namun, pada beberapa kondisi, asumsi ini memberikan kesalahan ketika model yang dihadapi ternyata adalah model 3D. Pada paper ini dituliskan kajian komputasi terhadap pengaruh keberadaan pondasi bangunan terhadap lintasan-lintasan geolistrik di sampingnya. Model berukuran node dengan spasi horisontal 0,5 m, tersusun oleh 4 lapisan akuifer normal yang mendatar. Digunakan 21 node tambahan untuk syarat batas Neuwmann di sisi-sisi model selain permukaan. Pada 5 node di sisi utara diberikan model blok pondasi sebuah bangunan. Perhitungan dilakukan menggunakan penyelesaian beda hingga Res3Dmod pada 21 lintasan untuk 4 konfigurasi: Schlumberger, Wenner, Dipole-dipole dan Pole-pole. Hasil kajian menunjukkan bahwa; pada kajian nilai selisih resistivitas semu pada area pondasi, konfigurasi Dipole-dipole memberikan respon yang paling tinggi terhadap kesalahan tersebut hingga pada jarak 11 m untuk selisih resistivitas semu <3 , sedangkan ketiga konfigurasi yang lain berada pada jarak 8 m. Nilai eror secara keseluruhan kurang dari 1%: Wenner dan Pole-pole sejauh 10 m dari pondasi, Schlumberger sejauh 11 m dari pondasi, dan Dipole-dipole sejauh 13 m dari pondasi. Konfigurasi Wenner memberikan respon yang paling baik dan konfigurasi Wenner juga merupakan konfigurasi yang direkomendasikan untuk menghindari kesalahan pengukuran 2D akibat keberadaan model 3D di bawahnya.","PeriodicalId":31789,"journal":{"name":"Positron","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139207188","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}

引用次数: 0

Peningkatan Kinerja Bio-Baterai Nanas Dengan Penambahan Pasta Aki Bekas dan Natrium Benzoat 添加废电池浆和苯甲酸钠可提高菠萝生物电池的性能

Positron Pub Date : 2023-11-30 DOI: 10.26418/positron.v13i2.70052

Neneng Fitrya, Shabri Putra Wirman, Latipa Hannum Dalimunthe, Indah Sri Welly, Romi Fadli Syahputra

{"title":"Peningkatan Kinerja Bio-Baterai Nanas Dengan Penambahan Pasta Aki Bekas dan Natrium Benzoat","authors":"Neneng Fitrya, Shabri Putra Wirman, Latipa Hannum Dalimunthe, Indah Sri Welly, Romi Fadli Syahputra","doi":"10.26418/positron.v13i2.70052","DOIUrl":"https://doi.org/10.26418/positron.v13i2.70052","url":null,"abstract":"Telah dilakukan penelitian mengenai pengaruh variasi penambahan aki dan natrium benzoat dari elektrolit kulit nanas terhadap peningkatan kinerja biobaterai. Penelitian ini bertujuan untuk mengetahui pengaruh variasi penambahan aki dan natrium benzoat dalam meningkatkan kinerja biobaterai dari kulit nanas sebagai elektrolit. Variasi campuran yang diukur yaitu elektrolit kulit nanas murni, elektrolit kulit nanas murni ditambah aki dan leektrolit kulit nanas murni ditambah aki ditambah natrium benzoat dengan pasangan elektroda yang digunakan yaitu Cu-Zn dan Al-Zn serta waktu penurunan pada elektrolit membuktikan tingkat maksimum kinerja dari biobaterai. Pengukuran karakteristik elektrik menggunakan lampu LED. Tegangan maksimum dihasilkan oleh variasi elektrolit kulit nanas murni dengan penambahan aki dan natrium benzoat dengan tegangan maksimum yaitu 8,5 V dan arus maksimum 9.50 mA serta daya maksimumnya 96,2 mW serta penurunan nilai tegangan dan arus selama 7 hari menghasilkan tegangan minimum 3,6 V dan arus minium 1,40 mA serta daya minimum sebesar 50,4 mW. Hal ini membuktikan bahwa penambahan aki dan natrium benzoate mampu meningkatkan kinerja biobaterai dari kulit nanas dan jumlah hari mempengaruhi kinerja dari biobaterai.","PeriodicalId":31789,"journal":{"name":"Positron","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139202629","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}

引用次数: 0

Quantitative Caffeine Analysis in Robusta Coffee Utilizing Amperometric Biosensing Technology 利用安培生物传感技术定量分析罗布斯塔咖啡中的咖啡因

Positron Pub Date : 2023-11-30 DOI: 10.26418/positron.v13i2.70008

V. A. Rosandi, L. Umar, R. N. Setiadi, Ari Sulistyo Rini, Erwin Erwin, Yanuar Yanuar, T. Linda

{"title":"Quantitative Caffeine Analysis in Robusta Coffee Utilizing Amperometric Biosensing Technology","authors":"V. A. Rosandi, L. Umar, R. N. Setiadi, Ari Sulistyo Rini, Erwin Erwin, Yanuar Yanuar, T. Linda","doi":"10.26418/positron.v13i2.70008","DOIUrl":"https://doi.org/10.26418/positron.v13i2.70008","url":null,"abstract":"Consuming caffeine in inappropriate amounts can disrupt various aspects, especially health. Controlling intake by knowing the caffeine levels in coffee is necessary to reduce the potential negative impacts. This research focuses on the detection of caffeine in Robusta coffee at two different concentrations (1:10 and 1:20 g/mL) and its relationship with yeast metabolism. An amperometric biosensor with a transimpedance amplifier to measure caffeine levels is used which has the advantages of sensitivity, cost-effectiveness, real time monitoring, biocompatibility, and reliable measurements. The data were statistically analyzed using ANOVA and visualized using Principal Component Analysis (PCA). The results revealed a concentration -dependent decrease in biosensor readings as caffeine levels increased (0.1, 0.5, 1, 1.5, and 2 mM), indicating caffeine's ability to inhibit yeast oxygen consumption and oxygen-dependent metabolic processes. The sensitivity of the biosensor in detecting caffeine is 36.66 mV/mM. PCA uncovered complex patterns, relationships, and variations within the caffeine data. PC1 and PC2, the first two principal components, collectively explained 86.3% of the data's variance. Eigenvalues for both PCs were greater than 1, highlighting their significance in understanding the dataset's complexity. This research enhances our understanding of caffeine content in Robusta coffee and its effects on yeast metabolism, providing valuable insights for the coffee industry. This use of yeast biosensors offers efficiency, and adaptability that make that biosensor valuable in a variety of scientific and industrial contexts.","PeriodicalId":31789,"journal":{"name":"Positron","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139205461","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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