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Observations of Magnetic Reconnection in the Magnetotail Associated With Substorms

空间科学学报 2010年第4期30卷 312-320页

作者： y.miyashita Solar-Terrestrial Environment Laboratory Nagoya UniversityFuro-choChikusa-kuNagoyaAichi 464-8601Japan

Magnetic reconnection is one of the most important,dynamic phenomena in the magnetotail in terms of magnetic field line configuration change and energy *** is believed to occur in the distant magnetotail mainly during southward interplanetary magnetic field periods and in the near-Earth magnetotail in association with *** the present paper,we discuss several important issues concerning magnetic reconnection in the magnetotail associated with substorms,such as reconnection signatures,location,timing,spatial scale,and behavior,from the macroscopic,observational point of view.

关键词：地球磁尾磁重联亚暴测相行星际磁场能量释放配置条件空间尺度

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Improvement in the mechanical properties of Al/SiC nanocomposites fabricated by severe plastic deformation and friction stir processing

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International Journal of Minerals,Metallurgy and Materials 2017年第3期24卷 297-308页

作者： M.Sarkari Khorrami M.Kazeminezhad y.miyashita A.H.Kokabi Department of Materials Science and Engineering Sharif University of Technology Department of Mechanical Engineering Nagaoka University of Technology

Severely deformed aluminum sheets were processed by friction stir processing(FSP) with Si C nanoparticles under different conditions to improve the mechanical properties of both the stir zone and the heat affected zone(HAZ).In the case of using a simple probe and the same rotational direction(RD) of the FSP tool between passes,at least three FSP passes were required to obtain the appropriate distribution of ***,after three FSP passes,fracture occurred outward from the stir zone during transverse tensile tests;thus,the strength of the specimen was significantly lower than that of the severely deformed base material because of the softening phenomenon in the *** improve the mechanical properties of the HAZ,we investigated the possibility of achieving an appropriate distribution of nanoparticles using fewer FSP *** results indicated that using the threaded probe and changing the RD of the FSP tool between the passes effectively shattered the clusters of nanoparticles and led to an acceptable distribution of Si C nanoparticles after two FSP *** these cases,fracture occurred at the HAZ with higher strength compared to the specimen processed using three FSP passes with the same RD between the passes and with the simple *** fracture behaviors of the processed specimens are discussed in detail.

关键词： friction stir processing plastic deformation aluminum silicon carbide nanocomposites mechanical properties

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Application of neural networks and ultraviolet spectroscopy to simultaneous determination of multiple vitamins

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Chinese Science Bulletin 1996年第18期41卷 1582-1584页

作者：李志良曾鸽鸣王树信李梦龙 H.yoshida y.miyashita S.Sasaki Department of Chemistry and Chemical Engineering Institute of Chemometrics and Pharmacology Hunan University Changsha 410082China Department of Chemistry and Chemical Engineering Institute of Chemometrics and Pharmacology Hunan University Changsha 410082 China Department of Knowledge-based Inforlnation Engineering Laboratory of Chemical Information Science Toyohashi University of Technology Toyohashi 441 Japan

Multivariate analysis and filtering techniques are widely applied to simultaneous and/or selective determination of multicomponent systems. Many methods among them are based on the principle of linear addition, while this principle does not always hold due to various physical and chemical factors. Using quite a different way, neural network (NN) based on a given learning rule, such as back propagation (BP) model, needs neither knowing nor using any form of input/output relationship. Particularly, NN can resolve various problems such as those with casual relation, those with fuzzy backgrounds, and those with uncertain inferential processes. NN was used by us to investigate quantitative struc-

关键词： NN Application of neural networks and ultraviolet spectroscopy to simultaneous determination of multiple vitamins

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无铅钎料96.5Sn-3.5Pb的疲劳断裂行为

无铅钎料96.5Sn-3.5Pb的疲劳断裂行为

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2004中国电子制造技术论坛

作者： y.miyashita y.Mutoh Department of mechanical Engeering Nogaoka University of Technology

96.5Sn-3.5Ag钎料的疲劳断裂实验以频率0.1-10Hz,应力比从0.1-0.7的范围内进行试验。在低应力比和高频的情况下(R=0.1和0.3在10Hz,R=0.1在1Hz),疲劳裂纹在测试试件内部以穿晶的形式传播,疲劳裂纹的生长依赖于循环次数。在高应力比(R≧0... 详细信息

96.5Sn-3.5Ag钎料的疲劳断裂实验以频率0.1-10Hz,应力比从0.1-0.7的范围内进行试验。在低应力比和高频的情况下(R=0.1和0.3在10Hz,R=0.1在1Hz),疲劳裂纹在测试试件内部以穿晶的形式传播,疲劳裂纹的生长依赖于循环次数。在高应力比(R≧0.5)和低频率(f=0.1Hz)时,疲劳裂纹以沿晶的形式传播,裂纹生长行为主要依赖于时间。在材料中形成不规则的Sn的共晶组织与片状的AgSn金属间化合物。片状的AgSn金属间化合物起着强化相的作用,提高了对依赖于循环次数的穿晶裂纹生长抗力,但对于依赖于时间的沿晶裂纹的生长抗力无明显的影响。在疲劳裂纹生长测试的过程中会观察到在Sn基体上小晶粒的生成,这是Sn基体多边化的结果。

关键词：钎料无铅疲劳裂纹的生长应力比断裂途径蠕变作用

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频率对无铅软钎料96.5Sn-3.5Ag的LCF行为的影响

频率对无铅软钎料96.5Sn-3.5Ag的LCF行为的影响

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2004中国电子制造技术论坛

作者： C.Kanchanomai y.miyashita y.Mutoh S.L.Mannan Department of Mechanical Engineering Nagaoka University of Technology Indira Gandhi Centre for Atomic Research Chennai

在温度为20℃的非接触应变控制系统中采用不同的频率(10-3-1Hz)对铸态共晶钎料(96.5Sn—3.5Ag)进行了LCF测试。LCF行为在试验所选频率范围内符合Coffin—Manson公式。试验中发现频率可以影响疲劳韧性系数。频率修正Coffin—Manson模型... 详细信息

在温度为20℃的非接触应变控制系统中采用不同的频率(10-3-1Hz)对铸态共晶钎料(96.5Sn—3.5Ag)进行了LCF测试。LCF行为在试验所选频率范围内符合Coffin—Manson公式。试验中发现频率可以影响疲劳韧性系数。频率修正Coffin—Manson模型可以成功的描述频率对疲劳行为的影响。在LCF测试试验中,微观裂纹初始发生在Sn元素富集树枝状结晶边界上的台阶(steps)处,然而在HCF测试试验中,微观裂纹初始发生在Sn元素富集树枝晶形成的亚晶粒边界处。这些微观裂纹的接合、扩展既有穿晶通过Sn—Ag共晶相区的,又有沿晶通过Sn元素富集树枝晶晶界和/或亚晶界的。研究认为多边化过程是促使这种小晶粒形成的原因。

关键词： LCF 裂纹萌生裂纹扩展亚晶粒无铅软钎料 96.5Sn/3.5Ag 树枝晶

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Ratio of Gravitational Force to Electric Force from Empirical Equations in Terms of the Cosmic Microwave Background Temperature

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Journal of Modern Physics 2024年第5期15卷 674-689页

作者： Tomofumi miyashita miyashita Clinic Osaka Japan

Previously, we presented several empirical equations using the cosmic microwave background (CMB) temperature. Next, we propose an empirical equation for the fine-structure constant. Considering the compatibility among these empirical equations, the CMB temperature (Tc) and gravitational constant (G) were calculated to be 2.726312 K and 6.673778 × 10−11 m3∙kg−1∙s−2, respectively. Every equation could be explained in terms of the Compton length of an electron (λe), the Compton length of a proton (λp) and a. Furthermore, every equation could also be explained in terms of Avogadro’s number and the number of electrons in 1 C. However, the ratio of the gravitational force to the electric force cannot be uniquely determined when the unit of the Planck constant (Js) is changed. In this study, we showed that every equation can be described in terms of Planck constant. From the assumption of minimum mass, the ratio of gravitational force to electric force could be elucidated.

关键词： Ratio of Gravitational Force to Electric Force Minimum Mass Temperature of the Cosmic Microwave Background

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Correspondence Principle for Empirical Equations in Terms of the Cosmic Microwave Background Temperature with Solid-State Ionics

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Journal of Modern Physics 2024年第1期15卷 51-63页

作者： Tomofumi miyashita miyashita Clinic Osaka Japan

Previously, we presented several empirical equations using the cosmic microwave background (CMB) temperature that were mathematically connected. Next, we proposed an empirical equation for the fine-structure constant. Considering the compatibility among these empirical equations, the CMB temperature (Tc) and gravitational constant (G) were calculated to be 2.726312 K and 6.673778 × 10-11 m3·kg-1·s-2, respectively. Every equation can be explained in terms of the Compton length of an electron (λe), the Compton length of a proton (λp) and α. However, these equations are difficult to follow. Using the correspondence principle with the thermodynamic principles in solid-state ionics, we propose a canonical ensemble to explain these equations in this report. For this purpose, we show that every equation can be explained in terms of Avogadro’s number and the number of electrons in 1 C.

关键词： Temperature of the Cosmic Microwave Background

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Algorithms for Empirical Equations in Terms of the Cosmic Microwave Background Temperature

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Journal of Modern Physics 2024年第10期15卷 1567-1585页

作者： Tomofumi miyashita miyashita Clinic Osaka Japan

Previously, we presented several empirical equations using the cosmic microwave background (CMB) temperature. Next, we propose an empirical equation for the fine-structure constant. Considering the compatibility among these empirical equations, the CMB temperature (Tc) and gravitational constant (G) were calculated to be 2.726312 K and 6.673778 × 10−11 m3∙kg−1∙s−2, respectively. Every equation can be explained numerically in terms of the Compton length of an electron (λe), the Compton length of a proton (λp) and α. Furthermore, every equation can also be explained in terms of the Avogadro number and the number of electrons at 1 C. We show that every equation can be described in terms of the Planck constant. Then, the ratio of the gravitational force to the electric force can be uniquely determined with the assumption of minimum mass. In this report, we describe the algorithms used to explain these equations in detail. Thus, there are no dimension mismatch problems.

关键词： Temperature of the Cosmic Microwave Background Minimum Mass The Ratio of Gravitational Force to Electric Force Dimension Analysis Redefinition Method Fine Structure Constant

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Correspondence Principle for Empirical Equations in Terms of the Cosmic Microwave Background Temperature with Solid-State Ionics

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Journal of Modern Physics（现代物理） 2024年第1期

作者： Tomofumi miyashita

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Ratio of Gravitational Force to Electric Force from Empirical Equations in Terms of the Cosmic Microwave Background Temperature

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Journal of Modern Physics（现代物理） 2024年第5期 674页

作者： Tomofumi miyashita

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