Jurnal Teori dan Aplikasi Fisika最新文献

{"title":"Perbandingan Aktifitas Fotokatalis Nanotitania Tanpa Dan Dengan Penambahan Etanolamina Di Bawah Sinar Matahari","authors":"Dita Rahmayanti, Posman Manurung, Roniyus Marjunus","doi":"10.23960/jtaf.v11i1.2767","DOIUrl":"https://doi.org/10.23960/jtaf.v11i1.2767","url":null,"abstract":"Degradasi zat warna remazol kuning keemasan dilakukan dengan nanotitania. Sintesis nanotitania dipreparasi menggunakan metode sol gel dengan penambahan etanolamina sebagai surfaktan. Penelitian ini dilakukan bertujuan untuk mengetahui pengaruh penambahan etanolamina terhadap aktivitas fotokatalis dan energi celah pita nanotitania. Dalam penelitian ini penggunaan titanium butoksida, etanol dan HCl. Penambahan etanolamina yang divariasikan adalah 0 dan 1 ml. Sampel dikalsinasi pada suhu 500ºC selama 4 jam. Nanotitania dikaraterisasi menggunakan Spektrofotometri UV-Vis dan UV-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS) menggunakan metode Kubelka-Munk dalam menentukan energi celah pita. Uji aktivitas fotokatalis dengan mendegradasi larutan remazol kuning keemasan menggunakan sinar matahari sebagai pembantu terjadinya reaksi. Hasil karaterisasi UV-Vis DRS energi celah pita yaitu 3,18 dan 3,03 eV pada masing-masing sampel tanpa penambahan dan dengan penambahan etanolamina berturut-turut.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130998381","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}

{"title":"SINTESIS DAN KARAKTERISASI WOLLASTONITE BERBASIS PREKUSOR BIOGENIK SILIKA ABU SEKAM PADI","authors":"Amilia Rasitiani, Dwi Asmi, M. Badaruddin","doi":"10.23960/jtaf.v11i1.2845","DOIUrl":"https://doi.org/10.23960/jtaf.v11i1.2845","url":null,"abstract":"The aim of this research is to make wollastonite from silica obtained from rice husk ash and commercial calcium carbonate using the solids reaction method. The DTA-TGA results show mass due to the evaporation of H2O and the decomposition of CaCO3 into CaO along with the calcination temperature, in addition, the DTA results also identify the formation of the β-CaSiO3 phase and the α-CaSiO3 phase. The XRD results of wollastonite obtained were dominated by the β-CaSiO3 phase and the minor phase was α-CaSiO3 this was indicated by the peak intensity of the β-CaSiO3 phase which was higher than the peak intensity of the α-CaSiO3 phase. the second phase in wollastonite is also the result of FTIR results through the analysis of the Si-O-Ca functional group in each wollastonite sample. In addition, the results of the SEM analysis showed the shape of the spheroidal particles (spherical) with an average grain size of 0.19 m, 0.35 m and 0.68 m for the calcination temperatures of 900 oC, 1000 oC and 1100 oC, respectively. The results of this study indicate that the manufacture of wollastonite from the basic ingredients of rice husk silica and commercial calcium carbonate has potential as an alternative material for the manufacture of wollastonite.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122181795","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}

{"title":"Nanofiber PVA/ZnO Sebagai Material Antimikroba Pada Wound Dressings","authors":"putri uzalia, D. Kusumawati","doi":"10.23960/jtaf.v11i1.3006","DOIUrl":"https://doi.org/10.23960/jtaf.v11i1.3006","url":null,"abstract":"Nanofibers are ideal for forming multifunctional medical products, one of which is wound dressings. Nanofibers wound dressings made from polyvynyl alcohol (PVA) and zinc oxide (ZnO) using the electrospinning method with varying voltages of 15 kv, 16 kv, 18 kv, and 20 kv, to determine the effect of stress on morphology, absorption and antibacterial activity. The resulting nanofibers have a smooth surface and an almost uniform fiber diameter. SEM analysis showed that the diameter of PVA 10% with a magnification of 50000X was 252 nm and PVA/ZnO 20 kv with a magnification of 30000X was obtained 231 nm, the EDX spectrum contained elements of C, O, and Zn respectively 37.40%, 62.14%, and 0.46%. The results of the FTIR analysis showed that the functional groups seen in the PVA/ZnO samples were O-H, CH2, C-H, C-O, and Zn-O. UV-Vis transmission showed that PVA had a high UV transmission of 12% but all PVA/ZnO nanofibers showed a UV transmission of almost 0%. Antimicrobial activity showed that the number of bacterial colonies in PVA/ZnO samples was less than the control. The average nanofibers diameter increases when ZnO nanoparticles are added, but when tension is increased, the average diameter of the nanofibers decreases. The morphology of the nanofibers is very uniform and there are no ZnO nanoparticle crystals, so PVA/ZnO nanofibers can be chosen as an ideal biomaterial for wound dressings.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129003106","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}

{"title":"Penerapan Jaringan Saraf Tiruan / JST (Backpropagation) untuk Prakiraan Cuaca di Bandar Udara Radin Inten II Lampung","authors":"A. Saputra, S. Sulistiyanti, Roniyus Marjunus, Yanti Yuliant, J. Junaidi, Arif Surtono","doi":"10.23960/jtaf.v11i1.3164","DOIUrl":"https://doi.org/10.23960/jtaf.v11i1.3164","url":null,"abstract":"Weather prediction is needed in planning daily life, one of which is to make decisions. The success of a weather prediction will have an impact on decision making in various fields, including agriculture and aviation. In the field of aviation, weather prediction is important to determine the time, location, direction of motion, altitude and plan the movement of aircraft to take into account operational disturbances that can be caused if the weather is bad and also to consider in determining flight routes or determining in carrying additional fuel if in an emergency. In the case of the aircraft having to return due to unfavorable weather conditions. Therefore the need for a good weather prediction method so as to reduce losses and damage. In this case the author tries to focus on the maximum parameters in the development of weather forecasting information design based on Artificial Neural Networks / Backpropagation by adding input data of rainfall, temperature, humidity, sunlight, air pressure, wind direction and wind speed. This research was conducted in the area of Radin Inten II Airport, Lampung. The material used in this study is in the form of daily data on meteorological conditions in the Radin Inten II Lampung Airport area from the Radin Inten II Meteorological Station for the last 3 years, from 2017 to 2019. This data is needed as input data for the algorithm that will be used in study. Based on the research results, the best training accuracy is 100% on the artificial neural network architecture with levenberg-marquardt training function parameters (trainlm) and scaled conjugate gradient (trainscg), binary sigmoid and bipolar sigmoid activation functions, and the number of neurons 20, 40, 60, 80, and 100. Meanwhile, the best test accuracy is 74,359% on the artificial neural network architecture with the training function parameters gradient descent wit momentum and adaptive learning rate (trainingdx) and binary sigmoid activation function (logsig) and the number of neurons 20 and 80.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124331076","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}

{"title":"Plasma Non Thermal Sebagai Sterilisasi Masker untuk Inaktivasi Virus Corona (COVID-19)","authors":"Fadila Abdullah, Valentinus Galih Vidia Putra","doi":"10.23960/jtaf.v10i2.2935","DOIUrl":"https://doi.org/10.23960/jtaf.v10i2.2935","url":null,"abstract":"","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132482575","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}

{"title":"Perhitungan Desain Konsep Reaktor Cepat Berpendingin Karbondioksida Superkritis dan Berbahan Bakar Uranium Metalik Alam","authors":"Via Vionita, Fiber Monado, Menik Ariani, Idha Royani","doi":"10.23960/jtaf.v10i2.3129","DOIUrl":"https://doi.org/10.23960/jtaf.v10i2.3129","url":null,"abstract":"","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131287420","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}

{"title":"Karakteristik Struktur Mikro, Struktur Fasa dan Sifat Fisis Komposit Silika Sekam Padi dengan Aspal","authors":"Devi Ika Safitri, Simon Sembiring, Leni Rumiyanti","doi":"10.23960/jtaf.v10i2.2658","DOIUrl":"https://doi.org/10.23960/jtaf.v10i2.2658","url":null,"abstract":"Synthesis and characterization silica of rice husks and asphalt composites have been carried out with a ratio of 65%: 35%; 70%: 30% and 75%: 25%. Silica synthesis from rice husk was carried out using the sol-gel method. The materials used in this research are rice husks, asphalt, aquades, gasoline, NaOH and HNO3. The purpose of this study was to determine the effect of silica and asphalt mass variations on the characteristics of microstructure, phase structure and physical properties namely density and porosity. Based on the research that has been done, it can be concluded that the results of SEM analysis show the formation of wad and cracks on the surface of the sample with an average grain size of 3,236 µm, 3,728 µm and 2,924 µm. In the EDS analysis results it can be seen that the elemental content contained in the samples is silica, oxygen, carbon, sulfur, sodium and aluminum. Where are the elements that dominate are the elements of silica, oxygen and carbon. Then based on XRD characterization results it is known that the sample has structure amorphous silica and amorphous carbon . The amorphous silica structure experiencing a shift 2θ with the highest peak intensity, from 2θ = 21˚ to 2θ = 22˚. Furthermore, the physical properties test of density 2.402 g / cm3, 2.692 g / cm3 and 2.852 g / cm3. In the physical properties test the porosity obtained was 9,825%, 8,028% and 6,835%.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114256008","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}

{"title":"SINTESIS DAN KARAKTERISASI SERAT NANOTITANIA DENGAN METODE ELECTROSPINNING","authors":"Nurul Oktavia, Posman Manurung, J. Junaidi, Pulung Karo-Karo","doi":"10.23960/jtaf.v10i2.2730","DOIUrl":"https://doi.org/10.23960/jtaf.v10i2.2730","url":null,"abstract":". Titanium Dioxide (TiO 2 ) nanofibers have been prepared using the electrospinning method. This study aims to determine the morphology and crystal structure of the TiO 2 nanofibers and to determine the effect of viscosity on the morphology and crystal structure formed. This study used titanium tetraisopropoxide as a precursor, ethanol as a solvent, acetic acid as a solution stabilizer and controlled the hydrolysis reaction of the precursor, and PVP as a fiber-making material. The amount of variations of acetic acid is 2; 2.5; 3; 3.5; and 4 ml respectively. The results of the viscosity test showed that the greater the acetic acid used, the smaller the viscosity. The electrospinning process was carried out at a high voltage of 13 kV with a flow rate of 1.5 ml/hour. The fiber obtained was then calcined at 450 o C for 3 hours. The calcined sample was then analyzed using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). SEM characterization results on samples B, C, and D showed that the sample diameters were 313 ± 28 nm, 275 ± 57 nm, and 242 ± 59 nm, respectively. The results of XRD characterization on sample D showed that the resulting sample had a tetragonal crystal structure with a mixed phase between anatase and rutile. The results of TEM characterization in sample D showed the fiber diameter with a size of 68.05 nm.","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116523193","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}

{"title":"Analisis Pengaruh Ketinggian Tanah dan Kedalaman Sumur terhadap Suhu dan pH Air Sumur di Kabupaten Blitar","authors":"Muhammad Syafa Tirtana Sanjaya, Tamara Pingki","doi":"10.23960/jtaf.v10i2.3010","DOIUrl":"https://doi.org/10.23960/jtaf.v10i2.3010","url":null,"abstract":"","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116450612","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}

{"title":"CALIBRATION TEST RESULT ACCELEROMETER SENSOR","authors":"Quart Ferrina, S. R. Sulistiyanti, J. Junaidi","doi":"10.23960/jtaf.v10i2.2813","DOIUrl":"https://doi.org/10.23960/jtaf.v10i2.2813","url":null,"abstract":"","PeriodicalId":314761,"journal":{"name":"Jurnal Teori dan Aplikasi Fisika","volume":"29 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128707904","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}