检索结果-南通市图书馆

A Comprehensive Classification and Analysis of Geomagnetic Storms Over Solar Cycle 24

Research in Astronomy and Astrophysics 2024年第8期24卷 75-84页

作者： Raja Adibah Raja Halim Shah Nurul Shazana Abdul Hamid Mardina Abdullah Adlyka Annuar Idahwati Sarudin Zahira Mohd Radzi Akimasa yoshikawa Department of Applied Physics Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600 BangiMalaysia Space Science Centre(ANGKASA) Institute of Climate ChangeUniversiti Kebangsaan Malaysia43600 BangiMalaysia Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600 BangiMalaysia School of Physics Universiti Sains Malaysia11800 USMPulau PinangMalaysia Malaysian Space Agency(MYSA) Kuala Lumpur50480Malaysia International Research Center for Space and Planetary Environmental Science(i-SPES) Kyushu University819-0395 FukuokaJapan

A geomagnetic storm is a global disturbance of Earth?s magnetosphere,occurring as a result of the interaction with magnetic plasma ejected from the *** considerable research,a comprehensive classification of storms for a complete solar cycle has not yet been fully developed,as most previous studies have been limited to specific storm *** study,therefore,attempted to present complete statistics for solar cycle 24,detailing the occurrence of geomagnetic storm events and classifying them by type of intensity(moderate,intense,and severe),type of complete interval(normal or complex),duration of the recovery phase(rapid or long),and the number of steps in the storm?s *** analysis was applied to data from ground-based magnetometers,which measured the Dst index as provided by the World Data Center for Geomagnetism,Kyoto,*** study identified 211 storm events,comprising moderate(177 events),intense(33 events),and severe(1 event)*** 36%of ICMEs and 23%of CIRs are found to be geoeffective,which caused geomagnetic *** to four-step development of geomagnetic storms was exhibited during the main phase for this solar *** showed the geomagnetic storms developed one or more steps in the main phase,which were probably related to the driver that triggered the geomagnetic storms.A case study was additionally conducted to observe the variations of the ionospheric disturbance dynamo(Ddyn)phenomenon that resulted from the geomagnetic storm event of 2015July *** attenuation of the Ddyn in the equatorial region was analyzed using the H component of geomagnetic field data from stations in the Asian sector(Malaysia and India).The variations in the Ddyn signatures were observed at both stations,with the TIR station(India)showing higher intensity than the LKW station(Malaysia).

关键词： (Sun)sunspots-Sun activity-(Sun)solar-terrestrial relations-Sun coronal mass ejections(CMEs)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An Experimental Study on Aerodynamic Sound Generated from Wake Interaction of Circular Cylinder and Airfoil with Attack Angle in Tandem

引用

Journal of Thermal Science 2008年第3期17卷 212-217页

作者： Mizue MUNEKATA Ryuta KOSHIISHI Hiroyuki yoshikawa hideki OHBA Department of Mechanical System Engineering

In our previous study, the effects of the interval between the cylinder and the airfoil on the aerodynamic sound were investigated and compared with the cases of single circular and single airfoil. In this study, the effects of the attack angle of the airfoil located downstream on the characteristics of aerodynamic sound and the wake structure are investigated at a given interval between the cylinder and the airfoil. It is found that the sound pressure level of DFN and the peak frequency decrease with increasing attack angle of airfoil because of the diffusive wake structure due to the increased back pressure of circular cylinder, which is caused by the blocking effect of airfoil. It is shown that the sound sources are corresponded to the attack points of shedding vortex form the upstream circular cylinder to the downstream airfoil. We conclude that the pressure fluctuation at the airfoil surface effects on the sound pressure level, from the flow visualizations and the exploration test of sound source.

关键词： aerodynamic sound wake interaction circular cylinder airfoil Karman's vortex flow visualization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of Pulsation on Separated Flow and Heat Transfer in Enlarged Channel

引用

Journal of Thermal Science 2011年第1期20卷 70-75页

作者： Hiroyuki yoshikawa Tomonori KAI Mizue MUNEKATA hideki OHBA Dept.of Mechanical System Engineering Kumamoto University2-39-1 KurokamiKumamoto 860-8555Japan Graduate School of Science and Technology Kumamoto University2-39-1 KurokamiKumamoto 860-8555Japan Kikuyo KikuchiKumamoto 869-1101Japan

Numerical results of three-dimensional separated flow and heat transfer in an enlarged rectangular channel are presented in this *** expansion ratio and aspect ratio of the channel are 2.0 and 16.0,*** number of the flow is 200 and it is over the critical Reynolds *** the critical Reynolds number,the flow in the symmetric channel becomes asymmetric and deflects to one side of the *** of the pulsating fluctuation at the inlet upon the flow in the channel are *** is clarified that the inlet flow with a pulsating fluctuation of Strouhal number 0.05 and 0.10 strongly affects on the flow in the channel,and heat transfer on the walls is enhanced,especially on the wall surface covered with long separation *** the other hand,the pulsation of St=0.0125 oscillates the shear layer more weakly than that of St=0.05,0.10 and the enhancement of heat transfer is smaller,though some vortices are shed from the vicinity of the side wall near the reattachment *** oscillation of the main flow calms down gradually as the Strouhal number of the pulsation increases over *** influence of pulsation of St=0.20 on the flow is restricted in the near downstream of the step,and heat transfer on the walls is almost similar to that of the steady flow in the channel.

关键词： Pulsating Fluctuation Symmetric Enlarged Channel Separated Flow Heat Transfer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Drying of Flowing Liquid Film on Rotating Disk

引用

Journal of Thermal Science 2010年第3期19卷 234-238页

作者： Mizue MUNEKATA Jun NISHIYAMA Akira NOGUCHI Hiroaki KURISHIMA Hiroyuki yoshikawa hideki OHBA Department of Mechanical System Engineering Kumamoto University2-39-1 KurokamiKumamoto 860-8555Japan Graduate School of Science and Technology Kumamoto University Tokyo Electron Kyushu LTD. 1-1 FukuharaKoshiKumamoto 861-1116Japan Kikuyo Kumamoto 869-1101Japan

Recently,development of high technology has been required for the formation of uniform thin film in manufacturing processes of semiconductor as the precision instruments become more sophisticated.A method called spin coating is often used for spreading photoresist on a wafer surface and drying photoresist *** spin coating process,photoresist is uniformly spread on the wafer surface by centrifugal force caused by rotating ***,it is a serious concern that streaky lines,which are caused by spiral vortices,appear on the wafer surface and prevent the formation of uniform film in the case of high rotating *** the other hand,in the case of low rotating speed,a small hump of the film is formed near the wafer *** main purpose of this study is to make clear the drying characteristics of the flowing liquid film on the rotating *** distribution of the flowing liquid film is captured by an infrared thermal video camera and radial gradient of the film temperature is introduced in order to evaluate the drying characteristic of the flowing film under steady state *** of the flow rate of the liquid film on the film temperature are *** film temperature gradually decreases in the radial direction in all *** low rotating speed,the radial gradient of the film temperature is almost constant *** the other hand,at high rotating speed,the radial gradient of the film temperature takes a certain maximum *** is found that the location of the gradient peak corresponds with the transition region of the air boundary layer,in which spiral vortices swirl,and shifts to the inner side of the disk with an increase of the liquid flow rate.

关键词： Spin coating Drying characteristic Liquid film flow Air boundary layer Spiral vortex

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Catch Cup Geometry on 3D Boundary Layer Flow over the Wafer Surface in a Spin Coating

引用

Journal of Thermal Science 2008年第1期17卷 56-60页

作者： Mizue MUNEKATA Seiichi KIMURA Hiroaki KURISHIMA Jinsuke TANAKA Sohei YAMAMOTO Hiroyuki yoshikawa Kazuyoshi MATSUZAKI hideki OHBA Department of Mechanical System Engineering 2-39-1 KurokamiKumamoto860-8555 Japan Assistant Professor Graduate School of Science and Technology Kumamoto University2-39-1 KurokamiKumamoto860-8555 Japan Tokyo Electron Kyushu LTD. 1-1 FukuharaKoushi-shiKumamoto861-1116 Japan Department of Mechanical System Engineering 2-39-1 KurokamiKumamoto860-8555 Japan Tokyo Electron LTD. 650 MitsuzawaHosaka-choNirasaki-shiYamanashi407-0192 Japan

Recently, development of high technology has been required for the formation of thin uniform film in manufacturing processes of semiconductor as the semiconductor instruments become more sophisticated. Spin coating is usually used for spreading photoresist on a wafer surface. However, since rotating speed of the disk is very high in spin coating, the dropped photoresist scarers outward and reattaches on the film surface. A catch cup is set up outside the wafer in spin coating, and scattered photoresist mist is removed from the wafer edge by the exhaust flow generated at the gap between the wafer edge and the catch cup. In the dry process of a spin coating, it is a serious concern that the film thickness increases near the wafer edge in the case of low rotating speed. The purpose of this study is to make clear the effect of the catch cup geometry on the 3D boundary layer flow over the wafer surface and the drying rate of liquid film.

关键词： Rotating disk Spin coating Boundary layer flow Laser Doppler velocimeter Infrared camera

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study of visualized simulation and analysis of nuclear fuel cycle system based on multilevel flow model

引用

Nuclear Science and Techniques 2005年第6期16卷 358-370页

作者： yoshikawa Hidekazu Graduate School of Energy Science Kyoto University Engineering Building 2 Room 123Kyoto University Yoshida Honmachi Sakyoku Kyoto Japan 606-8501

Complex energy and environment system, especially nuclear fuel cycle system recently raised socialconcerns about the issues of economic competitiveness, environmental effect and nuclear proliferation. Only underthe condition that those conflicting issues are gotten a consensus between stakeholders with different knowledgebackground, can nuclear power industry be continuingly developed. In this paper, a new analysis platform has beendeveloped to help stakeholders to recognize and analyze various socio-technical issues in the nuclear fuel cycle systembased on the functional modeling method named Multilevel Flow Models (MFM) according to the cognition theoryof human being. Its character is that MFM models define a set of mass, energy and information flow structures onmultiple levels of abstraction to describe the functional structure of a process system and its graphical symbol representationand the means-end and part-whole hierarchical flow structure to make the represented process easy to beunderstood. Based upon this methodology, a micro-process and a macro-process of nuclear fuel cycle system wereselected to be simulated and some analysis processes such as economics analysis, environmental analysis and energybalance analysis related to those flows were also integrated to help stakeholders to understand the process of decision-making with the introduction of some new functions for the improved Multilevel Flow Models Studio, and finallythe simple simulation such as spent fuel management process simulation and money flow of nuclear fuel cycleand its levelised cost analysis will be represented as feasible examples.

关键词：核燃料功能模型能源工业核能环境友好性核电厂

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Thermodynamic evaluation of new metallurgical refining processes for SOG-silicon production

引用

Transactions of Nonferrous Metals Society of China 2011年第3期21卷 685-690页

作者： Kazuki Morita Takeshi yoshikawa Institute of Industrial Science The University of Tokyo

With the aim of developing a new silicon refining process for production of solar grade silicon, a low-temperature refining technique referred to as ＂solidification refining of silicon with a Si-Al solvent at low temperature＂ was studied. The refinability of silicon by the partial solidification from a Si-Al solvent was discussed with thermodynamic evaluation for the impurity segregation between solid silicon and a Si-Al solvent. Impurity segregation ratios were measured by using temperature gradient zone melting method for phosphorus and boron and were estimated by the thermodynamic calculation for metallic impurities. The excellent refinability was clarified from the extremely small segregation ratios of impurities at lower temperature and was also confirmed by the test refining with the partial solidification under the induction heating. Furthermore, silicon crystal growth was studied by directional solidification experiments of a Si-Al alloy, and was estimated to be diffusion controlled.

关键词： silicon Si-Al solvent purification solar cells segregation thermodynamics solidification

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study on the hydrothermal drying technology of sewage sludge

引用

Science China(Technological Sciences) 2010年第1期53卷 160-163页

作者： Kunio yoshikawa Tokyo Institute of Technology G5-84259 Nagatsuta-choMidori-kuYokohama 226-8502Japan

Drying of sewage sludge is an effective way for treatment and utilization of sewage sludge,where reduction of energy consumption is one of the major technical *** we experimentally investigated the possibility of the hydrothermal *** have found that treatment of sewage sludge by saturated steam with the temperature of 190°C and pressure of 20 bar can dramatically improve the dehydration performance of the slurry like *** the water content can be reduced down to about 55% by a mechanical *** natural drying 24 h it can be reduced down to about 20%.The final product is almost odorless and can easily be used for the refuse derived fuel(RDF).The sewage sludge product may be used as land-fill,or burned in a boiler or incinerator.

关键词： sewage sludge hydrothermal drying mechanical dehydration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Computer-generated holograms for 3D display(Invited Paper)

引用

Chinese Optics Letters 2009年第12期7卷 1079-1082页

作者： Hiroshi yoshikawa Takeshi Yamaguchi Department of Electronics and Computer Science Nihon University

We have been studying various types of computer-generated holograms for three-dimensional （3D） displays both for a real-time holographic video display and a hard copy, or a printed hologram. For the hard copy output, we have developed a direct fringe printer, which is achieved to print over 100 gigapixels computer-generated hologram with 0.44μm pitch. In this paper, we introduce our recent progresses on the rainbow hologram, the cylindrical holograms, and the disk hologram for 3D display.

关键词： Computer-generated holograms for 3D display Figure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Computer-generated image hologram

引用

Chinese Optics Letters 2011年第12期9卷 20-23页

作者： Takeshi Yamaguchi Hiroshi yoshikawa Department of Electronics and Computer Science College of Science and Technology

We investigate the computer-generated hologram with full parallax and which can be reconstructed with white light. The object of the hologram is processed from three-dimensional computer graphics polygon data and has shaded surface for hidden surface removal. The optically reconstructed image from the printed hologram is evaluated.

关键词： Computer-generated image hologram CGH

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：