Indonesian Journal of Physics最新文献_第6页

Filter Design on Discrete-Time Neutral System Using Guaranteed Cost Method 用保证代价法设计离散中性系统滤波器

Indonesian Journal of Physics Pub Date : 2016-12-28 DOI: 10.5614/itb.ijp.2015.26.1.3

E. Susanto, Ig. Prasetya Dwi Wibawa, Junartho Halomoan

引用次数: 0

Landslide Dynamics and Determination Critical Condition Using of Resistivity Method in Desa Negeri Lima Ambon 内格里利马安邦滑坡动力学及电阻率法确定临界条件

Indonesian Journal of Physics Pub Date : 2016-12-28 DOI: 10.5614/itb.ijp.2015.26.1.1

M. Souisa, L. Hendrajaya, G. Handayani

{"title":"Landslide Dynamics and Determination Critical Condition Using of Resistivity Method in Desa Negeri Lima Ambon","authors":"M. Souisa, L. Hendrajaya, G. Handayani","doi":"10.5614/itb.ijp.2015.26.1.1","DOIUrl":"https://doi.org/10.5614/itb.ijp.2015.26.1.1","url":null,"abstract":"\u0000 \u0000 \u0000Ambon Island is a volcanic island arc and included in the territory of the archipelago of small islands are associated with subduction zones that have a high degree of vulnerability to natural disasters, such as erosion and landslides on a particular slope conditions. This study aims to determine the dynamics of avalanches below the surface in the area of the landslide and determine the position of the gelincirnya. The study area in the mountains of Ulak Hatu Negeri Lima Ambon. Research using geoelectric of resistivity with Wenner-Schlumberger configuration. Geoelectric interpretation results correlated with the drill data to obtain landslide field located at a depth of approximately 5 m - 30 m and lithology dominated by low resistivity values with the structure of a layer of clay mixed with layers of weathered rock and clay layer with water saturated. Both of these layers contact each other and form the slope of the ground, causing the potential for critical slip thereon and allows the subsequent landslides. Critical location landslide direction of the obliquity of the avalanche that is, toward the cliff and the geometry of the type of debris avalanches of rocks and debris flow. Estimation of landslides occur in addition to the local geological conditions, but strongly influenced by rainfall reached 335.0 mm, earthquakes and coupled with a slope of 119.0%. \u0000 \u0000 \u0000","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84285412","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: 6

Two-Dimensional Steady Flow Modeling of Ideal Fluid in Porous Medium Using Finite Element Method 多孔介质中理想流体二维定常流动有限元模拟

Indonesian Journal of Physics Pub Date : 2016-12-28 DOI: 10.5614/itb.ijp.2015.26.1.5

Hairil Anwar, W. Srigutomo

引用次数: 0

The Interdiffusion Modeling of Aluminide Coated Ti-47Al-2Cr-2Nb-0.5Zr-0.5Y Intermetallic Alloy 铝化物包覆Ti-47Al-2Cr-2Nb-0.5Zr-0.5Y金属间合金的相互扩散模型

Indonesian Journal of Physics Pub Date : 2016-12-28 DOI: 10.5614/itb.ijp.2015.26.1.4

F. Muhammad, E. Basuki, M. Juliansyah

{"title":"The Interdiffusion Modeling of Aluminide Coated Ti-47Al-2Cr-2Nb-0.5Zr-0.5Y Intermetallic Alloy","authors":"F. Muhammad, E. Basuki, M. Juliansyah","doi":"10.5614/itb.ijp.2015.26.1.4","DOIUrl":"https://doi.org/10.5614/itb.ijp.2015.26.1.4","url":null,"abstract":"\u0000 \u0000 \u0000In the present study, the interdiffusion behavior between coating layer and substrate of aluminide coated Ti- 47Al-2Cr-2Nb-0.5Zr-0.5Y intermetallic alloy were investigated at 800°C, 900°C, and 1000°C under argon atmosphere (closed system). The pack cementation, consists of 20%-wt. Al, 2%-wt. NH4Cl, and 78%-wt. Al2O3, was carried out at 900°C for 10 hours. The phases in the coatings, interdiffusion layer, and substrate were examined using optical microscope and scanning electron microscope (SEM) while the chemical composition were examined by Energy Dispersive X-Ray Spectroscopy (EDS) attached on the SEM. The interdiffusion coefficients were calculated according to Boltzmann-Matano method using the data obtained from EDS analyses. The calculated interdiffusion coefficients are 7.091 x 10-14, 1.650 x 10-12, and 5.261 x 10-12 cm2/s respectively for 800°C, 900°C, and 1000°C. The analytical and numerical method to predict the concentration profiles between coating layer, interdiffusion layer, and substrate. A reasonable agreement has been achieved between the experimental results and the simulated concentration profiles at every temperatures. \u0000 \u0000 \u0000","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75257608","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

Development of the Thermoacoustic Refrigerator System Using a Stack made of some Stainless Steel Mesh and a Hot Heat Exchanger 采用不锈钢网和热交换器组成的热声制冷机系统的研制

Indonesian Journal of Physics Pub Date : 2016-12-28 DOI: 10.5614/itb.ijp.2015.26.1.2

H. S. Dyatmika, W. N. Achmadin, P. Murti, I. Setiawan, A. Utomo

引用次数: 3

Focal Mechanism of Volcano-tectonic Earthquakes at Merapi Volcano, Indonesia 印尼默拉皮火山构造地震震源机制

Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2008.19.3.3

S. Hidayati, A. Ratdomopurbo, K. Ishihara, M. Iguchi

{"title":"Focal Mechanism of Volcano-tectonic Earthquakes at Merapi Volcano, Indonesia","authors":"S. Hidayati, A. Ratdomopurbo, K. Ishihara, M. Iguchi","doi":"10.5614/itb.ijp.2008.19.3.3","DOIUrl":"https://doi.org/10.5614/itb.ijp.2008.19.3.3","url":null,"abstract":"Merapi (2968 m), located in central Java, is one of the most active and dangerous volcanoes in Indonesia. The volcano has repeated episodes of dome growth and collapse, producing pyroclastic flows during historical time. Volcano-tectonic (VT) earthquakes have been classified into deep (VTA) and shallow one (VTB). Since August 2000, number of VT events (M=1.0-1.6) had increased, and pyroclastic flows have successively occurred from the middle of January, 2001. The focal zone vertically extends to about 4 km deep beneath the summit. VTA events are located at the depth 2.2-4.1 km and the VTB ones at the depth shallower than 1.3 km. An aseismic zone is observed around 1.3-2.2 km deep between the hypocenter zones of the two types of VT earthquakes, interpreted as shallow magma storage. Focal mechanism of VT events was estimated by using both polarity and amplitude of P-wave first motions at 4 seismic stations, assuming double couple mechanism and homogenous medium. Determined focal mechanisms for VTA events are of normal-fault types. VTA events might originate by increase in horizontal tension when magma rose up from deeper portion. Orientation of their T-axes is nearly horizontal in NEE-SWW direction which might be affected by the E-W regional tectonic stress. As for the VTB, normal fault types dominate the deep VTB zone, while at the shallow part, both reverse fault and normal fault types are originated. The pressure increases at shallow magma storage may cause generation of deep VTB events of normal fault types. As VTB events frequently originated, corresponding to increase of multiphase (MP) events which are related to growth of lava dome, shallow VTB events of reverse fault type might be generated by horizontal compression related to pressure decrease in magma conduit due to extrusion of lava and gases, and occasionally by pressure increase at the shallow part due to accumulation of magma or volcanic gases.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81335201","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: 19

Application of TALYS code for Calculation of Fission Cross Section and Fission Yield of Several Heavy Nuclides 应用TALYS程序计算几种重核素的裂变截面和裂变产率

Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2009.20.3.2

Y. S. Perkasa, R. Kurniadi, A. Waris

引用次数: 0

Simulation of Electron Transmittance and Tunneling Current in a Metal-Oxide- Semiconductor Capacitor with a High-K Dielectric Stack of HfO2 and SiO2 Using Exponential- and Airy-Wavefunction Approaches and a Transfer Matrix Method 利用指数波函数法、airy波函数法和传递矩阵法模拟高k介电堆叠HfO2和SiO2金属氧化物半导体电容器中的电子透过率和隧道电流

Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2009.20.2.2

K. Khairurrijal, F. A. Noor, M. Abdullah, S. Sukirno

{"title":"Simulation of Electron Transmittance and Tunneling Current in a Metal-Oxide- Semiconductor Capacitor with a High-K Dielectric Stack of HfO2 and SiO2 Using Exponential- and Airy-Wavefunction Approaches and a Transfer Matrix Method","authors":"K. Khairurrijal, F. A. Noor, M. Abdullah, S. Sukirno","doi":"10.5614/itb.ijp.2009.20.2.2","DOIUrl":"https://doi.org/10.5614/itb.ijp.2009.20.2.2","url":null,"abstract":"Analytical expressions of electron transmittance and tunneling current in a metal-oxide-semiconductor (MOS) capacitor with a high dielectric constant (high-K) oxide stack of HfO2 and SiO2 and a negative bias applied to the metal gate were derived. Exponential- and Airy-wavefunction approaches were employed in deriving analytically the electron transmittance and tunneling current. A numerical approach based on a transfer matrix method was used as a standard to evaluate the analytical approaches. It was found that the transmittances obtained under the exponential- and Airy-wavefunction approaches and the TMM are matching for low electron energies, while for higher energies only the transmittances calculated by employing the Airy- wavefunction approach is the same as those computed by using the TMM. It was also found that the tunneling currents calculated by using the exponential- and the Airy-wavefunction approaches and the TMM are equal for low oxide voltages (lower than 0.5 V), while for higher oxide voltages only the tunneling currents computed under the Airy-wavefunction approach fit those obtained under the TMM. Therefore, the Airy-wavefunction approach provides a better analytical model to tunneling processes in the MOS capacitor.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89646047","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

Development of Visible Light Absorption Measurement for Concentrated Dye Solution based on Attenuated Total Reflection Technique and Improvement on its Analysis Method 基于衰减全反射技术的浓染料溶液可见光吸收测量的发展及其分析方法的改进

Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2008.19.2.4

H. Hendro, M. Djamal, W. Wirawan, R. Hidayat

{"title":"Development of Visible Light Absorption Measurement for Concentrated Dye Solution based on Attenuated Total Reflection Technique and Improvement on its Analysis Method","authors":"H. Hendro, M. Djamal, W. Wirawan, R. Hidayat","doi":"10.5614/itb.ijp.2008.19.2.4","DOIUrl":"https://doi.org/10.5614/itb.ijp.2008.19.2.4","url":null,"abstract":"An absorption measurement working in ATR (Attenuated Total Reflection) mode has been design for characterization of concentrate dye solution. The system consists of a visible light system as polychromatic wave source, an ATR plate made up from glass or polymer, a spectrometer with a CCD detector. The system is connected to a computer for measurement and data processing. Some commercial inks measured by this ATR system showed absorption spectra which are in agreement with the color of the inks. The absorption parameter will be determined from the incident and reflection beam intensities measured at incident angle larger than the critical angle. We have also carried out Poynting vector analysis and we will show that the energy flow in the normal direction of the interface is not zero. The energy flow, however, decreases along the normal direction of the interface, indicating energy loss due to light absorption in the sample medium. The amount of energy loss depends on the attenuation index or absorption parameters, which is important for formulating the relation between the measured intensities and absorption parameters.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75047241","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 Advanced Energy System Using a Small Fast Reactor as an Energy Source 以小型快堆为能源的先进能源系统

Indonesian Journal of Physics Pub Date : 2016-11-03 DOI: 10.5614/itb.ijp.2008.19.2.1

Y. Kato, Y. Muto, T. Ishizuka, N. Nikitin, M. Utamura

{"title":"An Advanced Energy System Using a Small Fast Reactor as an Energy Source","authors":"Y. Kato, Y. Muto, T. Ishizuka, N. Nikitin, M. Utamura","doi":"10.5614/itb.ijp.2008.19.2.1","DOIUrl":"https://doi.org/10.5614/itb.ijp.2008.19.2.1","url":null,"abstract":"An advanced energy system has been proposed that involves a supercritical carbon dioxide gas turbine fast reactor (S-CO2 FR) as a dispersed energy source, a new waste-heat recovery system from the FR, and a bioconversion system using the recovered waste heat. The FR with S-CO2 gas turbine achieves higher cycle efficiency than conventional sodium-cooled FRs with steam turbines, eliminating problems of conventional FRs related to safety, plant maintenance, and construction costs. The S-CO2 FR consumes minor actinide elements produced in light water reactors as fuel, thereby reducing long-lived radioactive wastes and environmental loads imparted by long-term geological disposal. The recovered waste heat is used for methane and methanol production through fermentation of human and animal wastes in cities and farms. The methane and methanol are easily transported and can accommodate demand changes; they are useful as fuel of fuel cells, automobiles, and gas turbine power plants. The total energy utilization efficiency in electricity and heat is estimated to be higher than 85%, contributing to saving of energy resources and reduction of greenhouse-gas emissions. Consumption of the waste products of cities and farms for production of methane and methanol fosters a recycling society. Compact and high-performance microchannel heat exchangers are used in the S-CO2 FR, the new waste-heat recovery system and the fermentation system.","PeriodicalId":13535,"journal":{"name":"Indonesian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73415328","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