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Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics最新文献

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Investigation of Thermal Properties of Half-Heusler Alloy FeVZ (Z= As, P, Sb) within Density Functioal Theory 密度泛函理论下半heusler合金FeVZ (Z= As, P, Sb)热性能的研究
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Pub Date : 2021-06-25 DOI: 10.15408/fiziya.v4i1.19615
A. Azhar
{"title":"Investigation of Thermal Properties of Half-Heusler Alloy FeVZ (Z= As, P, Sb) within Density Functioal Theory","authors":"A. Azhar","doi":"10.15408/fiziya.v4i1.19615","DOIUrl":"https://doi.org/10.15408/fiziya.v4i1.19615","url":null,"abstract":"The figure of merit (ZT) holds an important role in thermoelectric material that indicates the efficiency of thermoelectric (TE) devices. The higher ZT value, the higher efficiency would be obtained of TE devices. One of the sub-class materials that has high potential application for thermoelectric material is half-Heusler (HH) alloy. In order to investigate the ZT value of HH conduct simulation using to investigate the ZT value of HH alloy FeVZ (Z= As, P, Sb) by using density-functional theory (DFT). Our research results show that FeVAs has higher ZT values than FeVP and FeVSb in the range temperature of 150-900 K. All of those compounds still have good ZT value around ~0.7 even in the temperature regime of 900 K, and shows a good trend for p-type thermoelectric materials.","PeriodicalId":243173,"journal":{"name":"Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125722721","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 Superhydrophobic-Superoleophilic Properties on Modification of Polyurethane Sponge for Selective Oil-Water Separation 聚氨酯海绵选择性油水分离改性的超疏水-超亲油性能分析
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Pub Date : 2021-06-25 DOI: 10.15408/fiziya.v4i1.19697
Niken Aprilia Eka Putri, A. Tjahjono, P. Sebayang
{"title":"Analysis of Superhydrophobic-Superoleophilic Properties on Modification of Polyurethane Sponge for Selective Oil-Water Separation","authors":"Niken Aprilia Eka Putri, A. Tjahjono, P. Sebayang","doi":"10.15408/fiziya.v4i1.19697","DOIUrl":"https://doi.org/10.15408/fiziya.v4i1.19697","url":null,"abstract":"In this research, a modification of polyurethane (PU) sponge material has been made to obtain superhydrophobic-superoleophilic properties. The PU sponge was coated with several nanomaterials such as ZnO, Fe3O4+TEOS, and stearic acid by dip-coating and drop-coating methods. The tests include selective separation of oil and water with a magnetic response. Several types of oil and organic solvents were tested for absorption capacity. The results showed that the PU@ZnO@Fe3O4@SA sponge has a good absorption capacity, from 4.37 mL to 7.37 mL. The fabricated PU sponge could selectively separate oil from water with a separation efficiency above 99%. The fabricated PU sponge also could be magnetically driven by external magnetic fields. From the characterization using 3D OM, the water contact angle was 153.38°, which indicates that the PU@ZnO@Fe3O4@SA sponge is superhydrophobic. And from surface morphology obtained an average pore size diameter of 167.475 μm.","PeriodicalId":243173,"journal":{"name":"Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129237505","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
Water Level Detection System based on Arduino and LabVIEW for Flood Monitors using Virtual Instrumentation 基于Arduino和LabVIEW的虚拟仪器洪水监测水位检测系统
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Pub Date : 2021-06-25 DOI: 10.15408/fiziya.v4i1.19808
Sabar Sabar, Dewi Maulidah Nur Anjani, S. Wijaya
{"title":"Water Level Detection System based on Arduino and LabVIEW for Flood Monitors using Virtual Instrumentation","authors":"Sabar Sabar, Dewi Maulidah Nur Anjani, S. Wijaya","doi":"10.15408/fiziya.v4i1.19808","DOIUrl":"https://doi.org/10.15408/fiziya.v4i1.19808","url":null,"abstract":"This virtual instrumentation system based on Arduino and LabVIEW aims to detect the water level using a water level sensor. The water level sensor used to measure the water level is the Funduino type. This sensor and the buzzer module are connected to the Arduino Uno to transmit data to LabVIEW. When the water has reached a certain height, this sensor will detect the water level. When the water has reached the set point, this sensor will sound a buzzer as a sign that the water is full. Based on the experimental results, it is found that the tension value affects the volume of the experiment site. Where the greater the volume used will produce a large voltage, and vice versa. Furthermore, the graph results obtained that are still away from the linearity of a regression function with a value of y = 0.0079x + 1.8561 and R² = 0.4298.","PeriodicalId":243173,"journal":{"name":"Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130872020","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
2D Forward Modeling Geothermal System Gravity Data in South Solok Region, West Sumatra 西苏门答腊南索洛克地区二维正演模拟地热系统重力数据
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Pub Date : 2021-06-25 DOI: 10.15408/fiziya.v4i1.20235
M. Nafian, B. Gunawan, N. R. Permana
{"title":"2D Forward Modeling Geothermal System Gravity Data in South Solok Region, West Sumatra","authors":"M. Nafian, B. Gunawan, N. R. Permana","doi":"10.15408/fiziya.v4i1.20235","DOIUrl":"https://doi.org/10.15408/fiziya.v4i1.20235","url":null,"abstract":"Indonesia has the greatest potential for geothermal energy in the world. Geothermal has an important role as an alternative fuel because it is a renewable energy source, but its use has not been maximized. One of the areas that have the greatest potential for geothermal energy in South Solok, West Sumatra. Therefore, this study was conducted to determine the geothermal system in the South Solok area, West Sumatra by using the gravity method. The gravity data processing stage requires some software to get the CBA value(Complete Bouguer Anomaly), map contours of the CBA. Anomaly separation with the butterworth filter method, determination of residual anomaly slice points, and 2D modeling of geothermal systems. Based on modeling, the qualitative interpretation interprets the Complete Bouguer Anomaly map which is suspected as a geothermal prospect area is a low anomaly ranging from 7.9 mgal - 9.4 mgal which is marked in dark blue. Meanwhile, quantitative interpretation produces modeling of the AB and CD slicing with a total of four layers. This layer consists of clay rock as a cap rock, sandstone as a reservoir, granite as a heated rock as a heat source, and the last layer in the form of magma as a heat source. The anomaly modeling of these two sections is dominated by granite rock with a density value of 2500 kg/m3 for the AB section and 2550 kg/m3 for the CD section.","PeriodicalId":243173,"journal":{"name":"Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115633502","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: 1
Paramagnetic and Diamagnetic Susceptibility of Infinite Quantum Well 无限量子阱的顺磁性和抗磁性磁化率
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Pub Date : 2020-12-31 DOI: 10.15408/fiziya.v3i2.18119
Adam B. Cahaya
{"title":"Paramagnetic and Diamagnetic Susceptibility of Infinite Quantum Well","authors":"Adam B. Cahaya","doi":"10.15408/fiziya.v3i2.18119","DOIUrl":"https://doi.org/10.15408/fiziya.v3i2.18119","url":null,"abstract":"Paramagnetism and diamagnetism of a material characterized by its magnetic susceptibility. When a material is exposed to an external magnetic field, magnetic susceptibility is defined as the ratio of the induced magnetization and the magnetic field. A paramagnetic material has magnetic susceptibility with positive sign. On the other hand, a diamagnetic material has magnetic susceptibility with negative sign. Atomically, paramagnetic materials consist of atoms that has orbital with unpaired electrons. Theoretical study of paramagnetic susceptibility and diamagnetic susceptibility are well described by Pauli paramagnetism and Landau diamagnetism, respectively. Although paramagnetism and diamagnetism are among the simplest magnetic properties of material that are studied in basic physics, theoretical derivations of Pauli paramagnetic and Landau diamagnetic susceptibility require second quantization formalism of quantum mechanics. We aim to discuss the paramagnetic and diamagnetic susceptibilities for simple three-dimensional quantum well using first quantization formalism.","PeriodicalId":243173,"journal":{"name":"Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133978158","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: 5
ANALISIS DATA INDUCED POLARIZATION DALAM MENDUGA ZONA MINERALISASI LOGAM DAERAH GODEAN, KABUPATEN SLEMAN DIY
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Pub Date : 2020-12-31 DOI: 10.15408/fiziya.v3i2.18159
Chandra Agus Rivananta, Refita Khumayroh
{"title":"ANALISIS DATA INDUCED POLARIZATION DALAM MENDUGA ZONA MINERALISASI LOGAM DAERAH GODEAN, KABUPATEN SLEMAN DIY","authors":"Chandra Agus Rivananta, Refita Khumayroh","doi":"10.15408/fiziya.v3i2.18159","DOIUrl":"https://doi.org/10.15408/fiziya.v3i2.18159","url":null,"abstract":"Keberadaan logam tersebar di dalam batuan dan biasa terikat dengan mineral bijih dan unsur kimia lainnya. Keberadaan mineral itu sendiri berhubungan dengan naiknya larutan hidrotermal dipermukaan melalui celah-celah batuan kemudian terendapkan. Pengendapan mineral yang terjadi di celah/rekahan/rongga batuan menyebabkan keberadaan mineral logam tersebar dan tidak terkonsentrasi di satu titik. Metode geofisika yang mampu memberi gambaran bawah permukaan mengenai keberadaan mineral logam di dalam batuan yaitu Metode Induksi Polarisasi (IP) kawasan waktu dengan menggunakan konfigurasi dipole-dipole. Metode IP mengamati polarisasi yang terjadi pada batuan yang mengandung mineral logam ketika batuan di aliri arus listrik. Hasil pengolahan data IP berupa penampang 2D dengan parameter yang terukur yaitu nilai chargeabilitas dan nilai resistivitas merupakan parameter untuk menentukan keberadaan zona mineralisasi logam. High chargeabilitas yang didukung dengan low resistivitas mengindikasikan adanya zona mineralisasi logam di daerah tersebut. Pada daerah penelitian, pada lintasan 1 nilai resistivitas yang terukur yaitu 9,84 Ωm – 1803 Ωm (Penampang pertama) dan nilai chargeabilitas yang terukur adalah 0  ms – 140 ms (Penampang kedua). Pada lintasan 2 nilai resistivitas yang terukur yaitu 12,5 Ωm – 743 Ωm (Penampang pertama) dan nilai chargeabilitas yang terukur adalah 0,0013 ms – 52,3 ms (Penampang kedua). Daerah penelitian terdapat zona mineralisasi pirit dominan dengan kadar sulfida Cu-Pb-Zn sangat rendah","PeriodicalId":243173,"journal":{"name":"Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121318121","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
SINTESIS DAN KARAKTERISASI Li4Ti5O12 YANG DILAPISI KARBON DENGAN METODE SOLID STATE REACTION UNTUK ANODA ION LITHIUM 合成和描述Li4Ti5O12，以碳为基础，对锂离子阳离子的固态反应方法
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Pub Date : 2020-12-31 DOI: 10.15408/fiziya.v3i2.17271
Lediliocza Lediliocza, Sitti Ahmiatri Saptari, Slamet Priyono
{"title":"SINTESIS DAN KARAKTERISASI Li4Ti5O12 YANG DILAPISI KARBON DENGAN METODE SOLID STATE REACTION UNTUK ANODA ION LITHIUM","authors":"Lediliocza Lediliocza, Sitti Ahmiatri Saptari, Slamet Priyono","doi":"10.15408/fiziya.v3i2.17271","DOIUrl":"https://doi.org/10.15408/fiziya.v3i2.17271","url":null,"abstract":"Telah dilakukan sintesis material anoda Li4Ti5O12 dilapisi karbon melalui metode solid state, dengan bahan baku LiOH H2O dan TiO2. sintesis dilakukan dengan variasi sumber karbon yaitu Super. P, Tapioka, dan karbon aktif Food grade. Prekursor Li4Ti5O12 disinter pada suhu 800o C selama 4 jam pada atmosfer udara bebas. Sedangkan proses pelapisan karbon dilakukan dengan milling basah dan sinter pada suhu 600o C selama 1 jam pada atmosfer N2. Karakterisasi yang dilakukan meliputi analisa untuk melihat perbedaan performa elektrokimia pada variasi sumber karbon yang digunakan, diantaranya analisa XRD (X-ray Diffraction) untuk mengetahui pembentukan fasa Li4Ti5O12, FESEM ( Field Emission Scanning Electron Microscopy) untuk menganalisa morfologi yang terbentuk, dan untuk mengetahui performa elektrokimia dilakukan pengujian Cyclic voltammetry, charge-discharge dan Electrochemical Impedance Spectroscopy (EIS). Hasil karaktrisasi terbentuk fasa Lithium titanium oxide (Li4Ti5O12) sebesar 96,1% dan fasa rutile (TiO2) sebesar 3,1%. Hasil karakterisasi FE-SEM menunjukan morfologi penyebaran karbon pada anoda Li4Ti5O12/C dengan sumber karbon Super P, paling homogen dbandingkan dengan anoda Li4Ti5O12/C dengan sumber karbon Tapioka kemudian anoda Li4Ti5O12/C dengan sumber karbon food grade. Performa elektrokimia yang dihasilkan Li4Ti5O12/C dengan sumber karbon Tapioka memiliki nilai konduktivitas elektronik dan konduktivitas ionik paling besar, dan menunjukan difusi ion lithium yang sangat kecil, namun memiliki nilai koefesien difusi 2,54 × 10−13 cm-2 s-1 mendekati besar koefesien difusi Li4Ti5O12/C (Sp) sebesar 2,61 × 10−13 cm-2 s1, serta memiliki nilai kapasitas discharge 161.05 mAh/g, mendekati nilai kapasitas discharge Li4Ti5O12/C (Sp) sebesar 167.84 mAh/g. ","PeriodicalId":243173,"journal":{"name":"Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130640275","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
Alat Pengukur Saturasi Oksigen Dalam Darah Menggunakan Metode Photoplethysmograph Reflectance 血氧饱和度计采用影射反射法
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Pub Date : 2020-12-31 DOI: 10.15408/fiziya.v3i2.17721
Candra Rizki Nugroho, Elvan Yuniarti, Ambran Hartono
{"title":"Alat Pengukur Saturasi Oksigen Dalam Darah Menggunakan Metode Photoplethysmograph Reflectance","authors":"Candra Rizki Nugroho, Elvan Yuniarti, Ambran Hartono","doi":"10.15408/fiziya.v3i2.17721","DOIUrl":"https://doi.org/10.15408/fiziya.v3i2.17721","url":null,"abstract":"Abstrak. Kekurangan oksigen pada tubuh dapat menyebabkan tubuh merasa mudah lelah, letih dan mengantuk, ini dikarenakan oksigen berperan sebagai salah satu sumber energi bagi tubuh selain nutrisi. Salah satu alat yang dapat mendiagnosa tubuh seseorang kekurangan oksigen adalah oximeter. Penelitian ini bertujuan untuk merancang bangun hardware serta software alat ukur saturasi oksigen menggunakan metode PPG reflectance menggunakan arduino Nano dan sensor MAX30100, menentukan karakteristik, membandingkan hasil pengukuran dengan alat pengukur saturasi oksigen yang menggunakan metode transmittance. Hasilnya telah berhasil merancang dan membangun alat pengukur saturasi oksigen (SpO2) dengan menggunakan sensor MAX30100 dan arduino Nano yang dapat dimonitoring pada HP menggunakan bluetooth HC-05 dengan jangkauan kurang dari 140 m pada ruang terbuka dengan tanpa halangan, waktu respon 5 detik, memiliki ketelitian pengukuran rata-rata di atas 96 % serta keakuratan sebesar 95,2%.","PeriodicalId":243173,"journal":{"name":"Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133308807","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: 1
DETERMINATION OF MINING ZONING ANDESITE, SIRTU AND TRAS MATERIALS IN PURBALINGGA DISTRICT CENTRAL JAVA 爪哇中部purbalingga地区安山岩、锡土和矿石的开采分区测定
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Pub Date : 2020-12-31 DOI: 10.15408/fiziya.v3i2.17934
A. Ariyanto, A. Haryono, Dimas Chaidir Adinugroho
{"title":"DETERMINATION OF MINING ZONING ANDESITE, SIRTU AND TRAS MATERIALS IN PURBALINGGA DISTRICT CENTRAL JAVA","authors":"A. Ariyanto, A. Haryono, Dimas Chaidir Adinugroho","doi":"10.15408/fiziya.v3i2.17934","DOIUrl":"https://doi.org/10.15408/fiziya.v3i2.17934","url":null,"abstract":"Purbalingga Regency has quite a large amount of Andesite, Sirtu and Tras Digging Materials. So a research was carried out in Purbalingga Regency to assist the Ministry of Energy and Mineral Resources (ESDM) in Determining the Mining Permit Zoning. This research was conducted only in 5 districts, namely Karangrejo District, Bojongsari District, Bobotsari District, Mrebet District and Kutasari District.The potential of Andesite Excavation Material with 2,159,081,136BCM resources spread across Karangrejo District, Bojongsari District, Bobotsari District, Mrebet District, and Kutasari District. Sirtu with 14,859,100BCM resources scattered in Karangrejo District, Bobotsari District, Bojongsari District and Mrebet District. Meanwhile, Tras with 15,510,500BCM resources which are only scattered in Karangrejo District.The determination to get the permit is closely related to the 11 parameters that have been shown in map form. Each of these parameters has a rating, weight, and value and a ming process is carried out in order to determine whether the area is suitable for permits, eligible for conditional permits, and not worthy of permits. Scores 10-19.5 are directed to be granted permission, scores 20-29.5 are directed to be eligible for conditional permission, while  ≥ 30 are directed to be not granted permission.The potential that is directed to be eligible for a permit is andesite 1,038,841,000BCM, Sirtu 6,861,400BCM and tras 9,280,500BCM, the potential that is directed to be eligible for conditional permits is andesite 67,520,000, sirtu 4,675,000BCM and tras 1,180,000BCM, while the potential that is directed is not feasible The permits are andesite 1,052,720.0BCM, sirtu 3,226,700BCM and tras 5,050,000BCM.","PeriodicalId":243173,"journal":{"name":"Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132383456","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
Solusi Metrik Kerr-Newman Untuk Dimensi Ruang-waktu 3+1 Dengan Invariansi Rotasi Anisotropik 纽曼氏3+1维空间尺寸的度量解决方案，其相互作用为三比一
Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Pub Date : 2020-12-31 DOI: 10.15408/fiziya.v3i2.18600
Iqbal Lafifa Zulfa, Rangga Prasetya Alamsyah, A. Fitriani
{"title":"Solusi Metrik Kerr-Newman Untuk Dimensi Ruang-waktu 3+1 Dengan Invariansi Rotasi Anisotropik","authors":"Iqbal Lafifa Zulfa, Rangga Prasetya Alamsyah, A. Fitriani","doi":"10.15408/fiziya.v3i2.18600","DOIUrl":"https://doi.org/10.15408/fiziya.v3i2.18600","url":null,"abstract":"Metrik Kerr-Newman merupakan solusi umum dari persamaan medan Einstein dengan mengasumsikan metrik ruang waktu melengkung akibat keberadaan objek masif bermassa dan bermuatan, serta memiliki simetri anisotropik akibat  rotasi. Metrik Kerr-Newman untuk dimensi ruang-waktu 3+1 diformulasikan pertama kali oleh Ezra Newman.  Algoritma umum untuk memformulasikan metrik ini yaitu dengan menggunakan persamaan medan Einstein secara  eksplisit, yang meliputi kalkulasi koneksi affine, tensor Ricci hingga tensor energi-momentum. Dimana, formulasi ini  tidaklah sederhana. Untuk menyederhanakan formulasi metrik Kerr-Newman untuk dimensi ruang-waktu 3+1, pada  artikel ini dilakukan formulasi dengan algoritma alternatif tanpa menggunakan persamaan medan Einstein secara  eksplisit. Kemudian, karena algoritma alternatif ini tidak menggunakan persamaan medan Einstein secara eksplisit  dan supaya memperoleh solusi metrik Kerr-Newman secara utuh, maka digunakan prinsip limitasi properti metrik  Kerr-Newman untuk membawa persamaan medan Einstein secara implisit. Berdasarkan prinsip limitasi  properti metrik Kerr-Newman, dilakukan rekayasa matematis atas fungsi temporal serta fungsi radial dari metrik  Reissner-Nordstrom dan metrik ruang-waktu datar dari sistem simetri anisotropik akibat rotasi, yang diturunkan dari  transformasi koordinat elipsoid oblate. Dan meski formalisme dengan algoritma alternatif ini relatif sederhana, solusi  metrik Kerr-Newman untuk dimensi ruang-waktu 3+1 pada artikel ini serupa dengan hasil formalisme dengan algoritma umum.","PeriodicalId":243173,"journal":{"name":"Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122149985","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: 1
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