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日本岛弧和俯冲作用

海洋地质译丛 1992年第4期 41-46页

作者： s.uyeda 潘秋霞

西太平洋俯冲带,包括日本岛弧,通常与东太平洋对应部的俯冲带有明显不同的特征。日本岛弧本身由二个弧系组成;东日本弧和西日本弧,它们也有明显不同的特征。本文对在这些俯冲带上的地质构造及深部结构的最近调查的一些结果进行评论。1 ... 详细信息

西太平洋俯冲带,包括日本岛弧,通常与东太平洋对应部的俯冲带有明显不同的特征。日本岛弧本身由二个弧系组成;东日本弧和西日本弧,它们也有明显不同的特征。本文对在这些俯冲带上的地质构造及深部结构的最近调查的一些结果进行评论。1 比较俯冲学及日本俯冲带的一般特征日本俯冲带构成了西太平洋边缘俯冲带的重要部分。另一个主俯冲带体系为沿东太平洋边缘的秘鲁-智利俯冲带体系。这两个体系的俯冲带通常有明显不同的特征。特别的是。

关键词：日本岛弧俯冲带

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对VAN方法信号识别判据的独立检验

世界地震译丛 1997年第3期28卷 4-8页

作者： T.Nagao M.Uyeshima s.uyeda 卢军国家地震局地球物理研究所

为了检验VAN研究组对地震电信号(sEs)识别所提出的判据的普遍性,我们对原始VAN地电位记录作了独立检验。(1)确认了艾奥尼纳(IOA)台3个月(1988年7月19日至10月18日)共338个异常变化。在应用VAN判据后,仅8个异常变化幸存下来作为可能的地... 详细信息

为了检验VAN研究组对地震电信号(sEs)识别所提出的判据的普遍性,我们对原始VAN地电位记录作了独立检验。(1)确认了艾奥尼纳(IOA)台3个月(1988年7月19日至10月18日)共338个异常变化。在应用VAN判据后,仅8个异常变化幸存下来作为可能的地震电信号,其中7个异常与VAN研究组当时发布的成功预报所用异常相同。(2)对IOA台28.5个月(1988年4月30日至1990年9月15日)进行了类似的检验。从3000多个异常变化中挑选41个变化作为可能的地震电信号。在这期间,VAN研究组共发布18次预报;VAN小组所用地震电信号中的14个变化与我们挑选的地震电信号是完全相同的,而4个变化我们认为是干扰。在两组资料中,共同的地震电信号一般要更强些。

关键词： VAN法信号识别判据独立检验地震电信号

VAN震电信号(sEs)和地震参数间的某种关系

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世界地震译丛 2000年第5期31卷 10-23页

作者： s.uyeda K.s.Al-Damegh E.Dologlou T.Nagao 吕春来卢军不详中国地震局地球物理研究所

研究了希腊西部1983年1月1日至1994年12月31日期间sEs(VAN法的震电信号)的特征与地震参数间的可能相关。在这一期间,约阿尼纳(IOA)和皮尔戈斯(PIR)VAN台站的所谓选择性图地区,总共有55次m_b≥5.0的地震。对其中的29次地震获得了矩心矩... 详细信息

研究了希腊西部1983年1月1日至1994年12月31日期间sEs(VAN法的震电信号)的特征与地震参数间的可能相关。在这一期间,约阿尼纳(IOA)和皮尔戈斯(PIR)VAN台站的所谓选择性图地区,总共有55次m_b≥5.0的地震。对其中的29次地震获得了矩心矩张量解;在IOA台18次地震之前有震电信号,而在PIR台则有11次。这些地震没有1次在发生之前在2个台站同时都有震电信号。本文的主要结果如下:(1)在IOA台站震电信号矢量的方向与所预报地震的震源位置有关,尽管邻近的地震经常有矢量方向不同的震电信号。(2)在IOA台29次地震中的9次逆冲型地震都观测到了震电信号,但它们的矢量方向不是唯一的。(3)在PIR台观测到的凯法利尼亚至伯罗奔尼撒以西地区震前有震电信号的11次地震具有法向分量度不同的走滑型。这些地震在PIR台震电信号的矢量方向主要是向西的。(4)1987年年底上述地区的震源机制从主要为走滑型变为逆冲型,这与敏感地点从PIR台转移到IOA台一致,说明震源机制与VAN台站的选择性特征间可能相关。

关键词：地震参数台站走滑震源机制矩张量解震源位置震中电信号 VAN 转移

与地壳活动有关的ULF地磁变化:RIKEN-NAsDA项目概要和最新结果

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世界地震译丛 2005年第3期36卷 50-53页

作者： K．Hattori I．Takahashi M．Hayakawa N．Isezaki K．Yumoto T．Nagao s．uyeda 李琪杨冬梅不详中国地震局地球物理研究所

尽管地震短临预报极其重要,并且经过了人们多年的努力,但它仍是目前未能解决的问题。近年来,与地震相关的电磁现象被认为是解决地震短临预报的有效途径之一。现在已经积累了大量的地震电磁前兆信号的震例,这些信号分布在很宽的频带范围(... 详细信息

尽管地震短临预报极其重要,并且经过了人们多年的努力,但它仍是目前未能解决的问题。近年来,与地震相关的电磁现象被认为是解决地震短临预报的有效途径之一。现在已经积累了大量的地震电磁前兆信号的震例,这些信号分布在很宽的频带范围(DC-VHF)内,其中ULF地磁变化是最有希望的地磁前兆之一。通过监测ULF地磁变化,有望实现地震短临预报。本文将阐述从ULF电磁信号中提取震磁异常变化的方法。

关键词：地磁变化 ULF 地壳活动地震短临预报概要项目电磁现象前兆信号信号分布地磁前兆异常变化电磁信号震例震磁

Effect of Eu3+,Bi3+,and Li+ doping on luminescent property of GdNbO4

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Journal of Rare Earths 2024年第1期42卷 66-75页

作者： s.W.Wi Y.s.Lee Department of Physics and Integrative Institute of Basic sciences Soongsil University

We investigated the emission properties of Eu3+-doped GdNbO4-based oxide phosphors,aiming at improving the Eu3+emission by codoping of Bi3+and Li+.Eu3+singly doped,Eu3+and Bi3+doubly doped,and Eu3+,Bi3+,and Li+triply doped GdNbO4were prepared using a high-temperature solid-state reaction *** red-orange emissions from Eu3+in the singly doped samples are significantly improved by the codoping of Bi3+,mainly due to the energy transfer from Bi3+to Eu3+.The additional codoping of Li+is found to increase the Eu3+emission *** improvement might be attributed to the increase in the photoluminescent quantum yield originating from larger grain sizes and better crystallinity.A detailed analysis of the X-ray diffraction pattern and the asymmetric ratio estimated from the photoluminescence spectra show that the local lattice environment around Eu3+in GdNbO4does not change significantly with the codoping of Bi3+and Li+.Our results indicate that Li+doping is a promising way to improve the emission properties of rare-earth ion-doped GdNbO4phosphors.

关键词： Eu 3+ GdNbO 4 Codoping of Li + Photoluminescence sensitizer Rare earths

First evidence for chiral wobbling of triaxial nuclei

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Nuclear science and Techniques 2024年第7期35卷 4-7页

作者： s.Frauendorf Department of Physics and Astronomy University of Notre DameNotre DameIN 46556USA

Chirality(Greek“handiness”)is a property of many com-plex *** molecules exist in two forms,one being the mirror image of the *** for our hands,it is impossible to make the images identical by a suitable *** two forms are called left-handed and *** have the same binding energy,because the electro-magnetic interaction,which holds the molecule together,does not change under a *** properties that are insensitive to the geometry are also the *** different geometry is the reason why the left-handed form turns the polarization plane of transmitted light in one direction by some angle while the right-handed form turns it in the oppo-site direction by the same ***,the geometrical differences between the two species may have other *** two species of the carvon molecule shown in Fig.1 taste quite differently.

关键词： turns Chiral mirror

Tribological behavior of lubricant-impregnated porous polyimide

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Friction 2024年第4期12卷 711-725页

作者： Jinbang LI Ningning ZHOU Janet s.s.WONG school of Mechanical Engineering and Mechanics Ningbo UniversityNingbo 315211China Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms Beijing Institute of Control EngineeringBeijing 100029China Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK

Porous materials impregnated with lubricants can be used in conditions where limited lubricant is *** this work,three porous polyimides(PPI)with different densities were ***(PAO)impregnated PPI(iPPI)discs were rubbed against steel and sapphire *** operando observations of the iPPI-sapphire contacts show that oil is released under an applied load,forming a meniscus around *** at the outlet is created at high sliding *** amount of released oil increases with increasing PPI *** moduli,E*,estimated based on the actual contact size show that trapped oil in iPPIs contributes to load *** higher speeds,tribological rehydration of the contact occurs in low density iPPI,with that E*rises with *** high density PPIs,high speeds give a constantly high E*which is limited by the viscoelastic properties of the PPI network and possibly the rate of oil *** of iPPI-steel contacts is governed by the mechanical properties of the PPI,the flow of the lubricant,and the roughness of the PPI *** low-and medium-density(highly porous,high roughness)PPIs,large amount of oil is released,and lubrication is mainly via lubricant restricted in the contact in the pores and possibly tribological *** high density(low porosity)PPI,with lower roughness,hydrodynamic lubrication is achieved which gives the lowest *** results show that polymeric porous materials for effective lubrication require the optimization of its surface roughness,stiffness,oil flow,and oil retentions.

关键词： polyimide porous material friction mechanism polymer limited lubrication

Enhancing fatigue performance of AZ31 magnesium alloy components fabricated by cold metal transfer-based wire arc directed energy deposition through LPB

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Journal of Magnesium and Alloys 2024年第4期12卷 1638-1662页

作者： shambhu Kumar Manjhi srikanth Bontha A.s.s.Balan Department of Mechanical Engineering National Institute of Technology KarnatakaSurathkalSrinivasanagarMangaloreKarnataka 575025India

Cold Metal Transfer-Based Wire Arc Directed Energy Deposition(CMT-WA-DED)presents a promising avenue for the rapid fabrication of components crucial to automotive,shipbuilding,and aerospace ***,the susceptibility to fatigue of CMT-WA-DED-produced AZ31 Mg alloy components has impeded their widespread adoption for critical load-bearing *** this study,a comprehensive investigation into the fatigue behaviour of WA-DED-fabricated AZ31 Mg alloy has been carried out and compared to commercially available wrought AZ31 *** findings indicate that the as-deposited parts exhibit a lower fatigue life than wrought Mg alloy,primarily due to poor surface finish,tensile residual stress,porosity,and coarse grain microstructure inherent in the WA-DED *** Plasticity Burnishing(LPB)treatment is applied to mitigate these issues,which induce significant plastic deformation on the *** treatment resulted in a remarkable improvement of fatigue life by 42%,accompanied by a reduction in surface roughness,grain refinement and enhancement of compressive residual stress ***,during cyclic deformation,WA-DED specimens exhibited higher plasticity and dislocation density compared to both wrought and WA-DED+LPB specimens.A higher fraction of Low Angle Grain Boundaries(LAGBs)in WA-DED specimens contributed to multiple crack initiation sites and convoluted crack paths,ultimately leading to premature *** contrast,wrought and WA-DED+LPB specimens displayed a higher percentage of High Angle Grain Boundaries(HAGBs),which hindered dislocation movement and resulted in fewer crack initiation sites and less complex crack paths,thereby extending fatigue *** findings underscore the effectiveness of LPB as a post-processing technique to enhance the fatigue performance of WA-DED-fabricated AZ31 Mg alloy *** study highlights the importance of LPB surface treatment on AZ31 Mg components produced by CMT-WA-DED to remove surface d

关键词： Wire arc additive manufacturing AZ31 Mg alloy Low plasticity burnishing Low cycle fatigue test strain amplitude

Ren-integrable and ren-symmetric integrable systems

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Communications in Theoretical Physics 2024年第3期76卷 62-69页

作者： s Y Lou school of Physical science and Technology Ningbo UniversityNingbo315211China

A new type of symmetry,ren-symmetry,describing anyon physics and corresponding topological physics,is ***-symmetry is a generalization of super-symmetry which is widely applied in super-symmetric physics such as super-symmetric quantum mechanics,super-symmetric gravity,super-symmetric string theory,super-symmetric integrable systems and so *** and Grassmann numbers are,in some sense,dual conceptions,and it turns out that these conceptions coincide for the ren situation,that is,a similar conception of ren-number(R-number)is devised for *** particular,some basic results of the R-number and ren-symmetry are exposed which allow one to derive,in principle,some new types of integrable systems including ren-integrable models and ren-symmetric integrable *** examples of ren-integrable KdV-type systems and ren-symmetric KdV equations are explicitly given.

关键词： symmetries integrable systems anyon physics extended supersymmetry ren-symmetry