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Indonesian Journal of Physics最新文献

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Effect of Annealed Si/Ti/Pt Hetero Structure on The Response Time and Signals of Hydrogen Sensors 退火Si/Ti/Pt异质结构对氢传感器响应时间和信号的影响
Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2011.22.1.3
W. Widanarto, F. Abdullatif, C. Senft, W. Hansch
{"title":"Effect of Annealed Si/Ti/Pt Hetero Structure on The Response Time and Signals of Hydrogen Sensors","authors":"W. Widanarto, F. Abdullatif, C. Senft, W. Hansch","doi":"10.5614/itb.ijp.2011.22.1.3","DOIUrl":"https://doi.org/10.5614/itb.ijp.2011.22.1.3","url":null,"abstract":"Titanium (Ti) and platinum (Pt) films deposited on p-doped Si electrode were incorporated as gas sensitive electrodes in Kelvin and Floating Gate Field Effect Transistor (FG-FET) systems. The films were annealed in oxygen at 800°C. SEM and EDX characterization methods were employed to study the surface of these films. Work function changes with respect to various hydrogen concentrations have been measured as a function of temperature and humidity. The results show that nano grains of titanium silicide (TiSi2) and Pt islands are formed after the annealing. Annealed TiSi2/Pt films are well suitable to significantly stabilize FG-FET based hydrogen sensor. The sensors can detect H2 in concentration range between 0.3% and 2% from room temperature up to 135°C. The response time is quite fast i.e. t90 ~ 43.2 seconds. An experiment on the stability has proved that signal pattern of the sensors remained stable one month after first conditioning.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":"146 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75708377","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
Construction of a generic reference material for gamma ray spectrometric analysis 伽玛射线光谱分析通用标准物质的构建
Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2011.22.4.1
J. Kebwaro, N. Hashim, A. Mustapha
{"title":"Construction of a generic reference material for gamma ray spectrometric analysis","authors":"J. Kebwaro, N. Hashim, A. Mustapha","doi":"10.5614/itb.ijp.2011.22.4.1","DOIUrl":"https://doi.org/10.5614/itb.ijp.2011.22.4.1","url":null,"abstract":"An artificial reference material (RGMIX) has been constructed from three IAEA materials (RGU-1, RGTH-1, RGK-1). The material is analogous of an environmental radioactive material. The material is systematically analysed on a NaI(Tl) detector using the method of spectrum decomposition. The spectrum of the sample is similar to that of a geological material.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83637742","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
Synthesis and Characterization of Bi2TixV1-xO5.5-δ as Electrolyte Material in Solid Oxide Fuel Cell 固体氧化物燃料电池电解质材料bi2tix_1 - xo5.5 -δ的合成与表征
Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2011.22.3.4
B. Prijamboedi, C. D. Sundari, Rolan Rusli, I. Ismunandar
{"title":"Synthesis and Characterization of Bi2TixV1-xO5.5-δ as Electrolyte Material in Solid Oxide Fuel Cell","authors":"B. Prijamboedi, C. D. Sundari, Rolan Rusli, I. Ismunandar","doi":"10.5614/itb.ijp.2011.22.3.4","DOIUrl":"https://doi.org/10.5614/itb.ijp.2011.22.3.4","url":null,"abstract":"Oxide materials of Bi2TixV1-xO5,5-δ have been synthesized by means of conventional solid state reaction method. Substitution of Ti atom for the V sites leads to the formation of single phase Bi2TixV1-xO5,5-δ material with I4/mmm space group of tetragonal structure as well as gives results in large grain size and good sinterability of the ceramic material. With Ti concentration of x = 0.2, sample without the presence of porous could be obtained. The ionic conductivity of Bi2TixV1-xO5,5-δ increases significantly with the presence of Ti atoms. This Ti substitution also reduces phase transition temperatures in Bi2TixV1-xO5,5-δ materials. The conductivity data and scanning electron microscope images show that the Ti concentration in Bi2TixV1-xO5,5-δ could be applied as much as x = 0.2, which is higher than reported before and it still gives better properties.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78563043","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 a Transverse Magnetic Field on Buoyancy-Driven Flow and Heat Transfer in a Porous Trapezoidal Enclosure 横向磁场对多孔梯形壳内浮力驱动流动和传热的影响
Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2011.22.3.3
H. Saleh, I. Hashim
{"title":"Effect of a Transverse Magnetic Field on Buoyancy-Driven Flow and Heat Transfer in a Porous Trapezoidal Enclosure","authors":"H. Saleh, I. Hashim","doi":"10.5614/itb.ijp.2011.22.3.3","DOIUrl":"https://doi.org/10.5614/itb.ijp.2011.22.3.3","url":null,"abstract":"The effect of a magnetic field on buoyancy-driven flow and heat transfer in a trapezoidal enclosure filled with a fluid-saturated porous medium is studied numerically using the finite difference method. The inclined sloping boundaries are treated by adopting staircase-like zigzag lines. The sloping walls are maintained isothermally at different temperatures. The top and bottom horizontal straight walls are kept adiabatic. The results indicate that the heat is transferred almost entirely by pure conduction with a sufficiently large magnetic field. Utilitizing the square geometry is more effective to suppress the heat transfer rate than the trapezoidal geometry.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74197786","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
Comparison of Electron Direct Transmittance and Tunneling Time of Si (100)/HfO2/Si (100) and Si (110)/HfO2/Si (110) Structures with Ultra-thin Trapezoidal Barrier 超薄梯形势垒Si (100)/HfO2/Si(100)和Si (110)/HfO2/Si(110)结构的电子直接透过率和隧穿时间的比较
Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2007.18.2.1
F. A. Noor, M. Abdullah, S. Sukirno, K. Khairurrijal
{"title":"Comparison of Electron Direct Transmittance and Tunneling Time of Si (100)/HfO2/Si (100) and Si (110)/HfO2/Si (110) Structures with Ultra-thin Trapezoidal Barrier","authors":"F. A. Noor, M. Abdullah, S. Sukirno, K. Khairurrijal","doi":"10.5614/itb.ijp.2007.18.2.1","DOIUrl":"https://doi.org/10.5614/itb.ijp.2007.18.2.1","url":null,"abstract":"An analytical expression of electron direct transmittance and tunneling time through a nanometer-thick trapezoidal potential barrier have been derived by using a phase-time method with Airy wavefunction solution. The expression is applied to Si(100)/HfO2/Si(100) (isotropic) and Si(110)/HfO2/Si(110) (anisotropic) structures calculated under the consideration of barrier width, incident energy, incident angle, and bias voltage. The calculated results are discussed and comparisons between the isotropic and anisotropic heterostructures are discussed.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":"126 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76149016","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
A Comparison of Zinc and Carbon Doped on the Atomic Interdiffusion of InGaAs/AlGaAs Quantum Wells Laser Structures After Annealing 锌和碳掺杂对退火后InGaAs/AlGaAs量子阱激光结构原子间扩散的影响
Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2009.20.2.1
P. Gareso
{"title":"A Comparison of Zinc and Carbon Doped on the Atomic Interdiffusion of InGaAs/AlGaAs Quantum Wells Laser Structures After Annealing","authors":"P. Gareso","doi":"10.5614/itb.ijp.2009.20.2.1","DOIUrl":"https://doi.org/10.5614/itb.ijp.2009.20.2.1","url":null,"abstract":"We have compared a zinc and a carbon doped on the atomic interdiffusion of InGaAs/AlGaAs after annealing using Electrochemical capacitance voltage (EC-V), X-ray diffraction and photoluminescence (PL) measurements. Electrochemical capacitance voltage measurements revealed that the carrier concentration in the Zn-doped p++GaAs contact layers decreased after annealing at 900oC for 60 sec, indicating that some of the Zn acceptors were passivated or outdiffused from the surface. In contrast to the C-doped samples, an increase of carrier concentration was observed after annealing. X-ray rocking curve confirmed this result where the amount of lattice contraction increase after annealing which is attributed to the presence of the substitutional carbon CAs. Photoluminescence results showed that a large energy shift was observed in the Zn-doped samples compare with C- doped samples. Photoluminescence measurements after etching to various depth showed similar luminescence defects in both Zn- and C-doped samples. Photocurrent measurements showed the quality of quantum well was improve after annealing in C-doped samples due to activation of carbon doped.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":"8 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78644480","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
Performance Analysis of 2D and 3D Fluid Flow Modelling Using Lattice Boltzmann Method 基于晶格玻尔兹曼方法的二维和三维流体流动建模性能分析
Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2007.18.2.2
F. Latief, U. Fauzi
{"title":"Performance Analysis of 2D and 3D Fluid Flow Modelling Using Lattice Boltzmann Method","authors":"F. Latief, U. Fauzi","doi":"10.5614/itb.ijp.2007.18.2.2","DOIUrl":"https://doi.org/10.5614/itb.ijp.2007.18.2.2","url":null,"abstract":"Several studies have been conducted to observe properties of fluid flow in materials using the Lattice Boltzman Method (LBM). There are two widely used lattice model, the D2Q9 for the 2D simulation, and the D3Q19 for the 3D simulation. Our particular interest is to study the velocity map both using the 2D and the 3D simulation, using the same object. The aim of this study is to evaluate effectiveness and efficiency of both methods. In our simulation, the velocity profile between the 2D and 3D models differs greatly (mean error 30.4%) if the object has complex lateral structure (the shape along the z-axes differs greatly), while for the less complex object, the profile has only 1.4% of mean error. The computing time for the 3D model took 13 times longer than the simulation of the 2D model. The result from the comparison of both methods concludes that the simplification of fluid flow simulation of 3D objects into 2D objects should be taken carefully, for in some cases, the simplification is not quite appropriate.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89966183","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
Anisotropy of Magnetic Susceptibility and Elemental Compositions in Andesitic Rocks 安山岩磁化率和元素组成的各向异性
Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2008.19.1.3
K. Sastrawiharja, S. Bijaksana, U. Fauzi, L. Pasasa
{"title":"Anisotropy of Magnetic Susceptibility and Elemental Compositions in Andesitic Rocks","authors":"K. Sastrawiharja, S. Bijaksana, U. Fauzi, L. Pasasa","doi":"10.5614/itb.ijp.2008.19.1.3","DOIUrl":"https://doi.org/10.5614/itb.ijp.2008.19.1.3","url":null,"abstract":"Igneous rocks, including andesites, are composed of these major elements: Si, Ti, Al, Fe, Mn, Ca, Mg, Na, K, and P. Variation in the composition of these elements, which occur mostly as oxides, determines the overall physical properties of the rocks. Not surprisingly, classification of igneous rocks is also based on the quantity of these major oxides. In this study, elemental compositions of andesitic rocks from the Island of Java will be compared to the anisotropy of magnetic susceptibility (AMS) as a part of our effort to explore the possibility of using rock magnetic parameters in classifying igneous rocks. The objective is to check whether AMS parameters could serve as alternative to chemical analysis. To do so, we have measured the AMS and geochemical composition of andesitic rock samples from 10 different sites across Central Java and Yogyakarta. The results show that there are significant correlations between the abundance of certain elements with AMS parameters, for example, the abundance of Fe and Al with magnetic lineation and the abundance of Al with degree of anisotropy. These results show that magnetic parameters have a good change to be use as predictors for major elements composition in igneous rocks.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":"87 9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87698561","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
An Application of the General Relativity-type Inversion Formulae: the Derivation of the Fock-Schwinger-Friedmann-Robertson-Walker Christoffel Symbol 广义相对论型反演公式的应用:fock - schwinger - friedman - robertson - walker Christoffel符号的推导
Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2009.20.1.2
Triyanta Triyanta
{"title":"An Application of the General Relativity-type Inversion Formulae: the Derivation of the Fock-Schwinger-Friedmann-Robertson-Walker Christoffel Symbol","authors":"Triyanta Triyanta","doi":"10.5614/itb.ijp.2009.20.1.2","DOIUrl":"https://doi.org/10.5614/itb.ijp.2009.20.1.2","url":null,"abstract":"Similar relationship between Christoffel symbols and Riemann tensors and between gauge potentials and gauge field strengths enable us to treat the Christoffel symbols just like the gauge fields. Restricting the Christoffel symbol by the Fock-Schwinger (FS) condition one obtains the so-call inversion formulae in general relativity theory. These formulae may be utilized for various applications, including the Christoffel symbol-free formulation of the general relativity and calculating the so-called Fock-Schwinger Christoffel symbols for certain Riemann tensors. Here we will derive the Fock-Schwinger-Friedmann-Robertson-Walker (FSFRW) Christoffel symbols.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84440688","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
Damped Zigzag Upward Motion of a Ball in Fluid: a Numerical Model 球在流体中的阻尼之字形向上运动:一个数值模型
Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2009.20.1.5
M. Tajuddin
{"title":"Damped Zigzag Upward Motion of a Ball in Fluid: a Numerical Model","authors":"M. Tajuddin","doi":"10.5614/itb.ijp.2009.20.1.5","DOIUrl":"https://doi.org/10.5614/itb.ijp.2009.20.1.5","url":null,"abstract":"Several types of upward motion of a ball in a cylinder filled with water are observed in experiment such as straight, damped zigzag, and zigzag upward motion. Center of mass of the balls and the way the balls are released play important role to determine the type of occuring upward motion. A simple theoretical model regarding only gravitational force, Stokes drag force, and Archimedes bouyancy force, where the work points of these forces are not coincident, are developed and used to explain the damped zigzag motion.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83586273","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
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