检索结果-南通市图书馆

Chinese physics B 2020年第8期29卷 407-412页

作者： Yong Li peng Xu Xiaoming Zhang Guodong Liu enke Liu Lingwei Li Institute of Advanced Magnetic Materials School of Materials and Environmental EngineeringHangzhou Dianzi UniversityHangzhou 310012China Key Laboratory of Electromagnetic processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Institute of physics Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

The electronic structures,magnetic properties,and martensitic transformation in all-d-metal Heusler-like alloys Cd2MnTM(TM=Fe,Ni,Cu)were investigated by the first-principles calculations based on density-functional *** results indicate that all three alloys are stabilized in the ferromagnetic L21-type *** total magnetic moments mainly come from Mn and Fe atoms for Cd2MnFe,whereas,only from Mn atoms for Cd2MnNi and *** magnetic moment at equilibrium lattice constant of Cd2MnFe(6.36μB)is obviously larger than that of Cd2MnNi(3.95μB)and Cd2MnCu(3.82μB).The large negative energy differences(ΔE)between martensite and austenite in Cd2MnFe and Cd2MnNi under tetragonal distortion and different uniform strains indicate the possible occurrence of ferromagnetic martensitic transformation(FMMT).The minimum total energies in martensitic phase are located with the c/a ratios of 1.41 and 1.33 for Cd2MnFe and Cd2MnNi,*** total moments in martensitic state still maintain large values compared with those in cubic *** study is useful to find the new all-d-metal Heusler alloys with FMMT.

关键词： all-d-metal Heusler-like alloys electronic structures magnetic properties martensitic transformation

Spin excitations and spin wave gap in the ferromagnetic weyl semimetal Co3Sn2S2

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2021年第1期64卷 3-9页

作者： Chang Liu JianLei Shen JiaCheng Gao ChangJiang Yi Di Liu Tao Xie Lin Yang Sergey Danilkin GuoChu Deng wenHong wang ShiLiang Li YouGuo Shi HongMing weng enke Liu HuiQian Luo Beijing National Laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of SciencesBeijing100190China School of physical Sciences University of Chinese Academy of SciencesBeijing100190China Australian Centre for Neutron Scattering Australian Nuclear Science and Technology OrganizationLucas HeightsNSW2234Australia Songshan Lake Materials Laboratory Dongguan523808China physical Science Laboratory Huairou National Comprehensive Science CenterBeijing101407China

we report a comprehensive neutron scattering study on the spin excitations in the magnetic weyl semimetal Co3Sn2S2 with a quasi-two-dimensional *** in-plane and out-of-plane dispersions of the spin waves were revealed in the ferromagnetic ***,dispersive but damped spin excitations were found in the paramagnetic *** effective exchange interactions were estimated using a semi-classical Heisenberg model to consistently reproduce the experimental TCand spin ***,a full spin wave gap below Eg=2.3 meV was observed at T=4 *** value was considerably larger than the estimated magnetic anisotropy energy(~0.6 meV),and its temperature dependence indicated a significant contribution from the weyl *** results suggest that Co3Sn2S2 is a three-dimensional correlated system with a large spin stiffness,and the low-energy spin dynamics can interplay with the topological electron states.

关键词： magnetic weyl semimetal topological materials spin excitations neutron scattering

RF-CApACITIVE TRANSDUCER AppLIED TO GRAVITATIONAL WAVE DETECTOR

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 1987年第12期4卷 553-556页

作者： ZHU Ning GUAN Tongren HU enke Gravitational physics Laboratory Zhongshan UniversityGuangzhou

we have designed and made an rf-capacitive transducer for the square antenna of our laboratory.A variable capacitor(~2000 pF),which is modulated by gravitational radiation,works in a 5 MHz resonant *** most advantageous feature of this transducer is that the sensitivity is highly improved by introducing aπ-net-work transformation in the resonant *** sensitivity of 9.4MHz/M is obtained.

关键词： WAVE resonant App

On the anomalous low-resistance state and exceptional Hall component in hard-magnetic weyl nanoflakes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2021年第8期64卷 107-113页

作者： QingQi Zeng GangXu Gu Gang Shi JianLei Shen Bei Ding Shu Zhang XueKui Xi Claudia Felser YongQing Li enke Liu Beijing National Laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of physics and Astronomy University of CaliforniaLos Angeles 90095USA Max planck Institute for Chemical physics of Solids Dresden D-01187Germany Songshan Lake Materials Laboratory Dongguan 523808China

Magnetic topological materials, which combine magnetism and topology, are expected to host emerging topological states and exotic quantum phenomena. In this study, with the aid of greatly enhanced coercive fields in high-quality nanoflakes of the magnetic weyl semimetal Co_(3)Sn_(2)S_(2), we investigate anomalous electronic transport properties that are difficult to reveal in bulk Co_(3)Sn_(2)S_(2) or other magnetic materials. When the magnetization is antiparallel to the applied magnetic field, the low longitudinal resistance state occurs, which is in sharp contrast to the high resistance state for the parallel case. Meanwhile, an exceptional Hall component that can be up to three times larger than conventional anomalous Hall resistivity is also observed for transverse transport. These anomalous transport behaviors can be further understood by considering nonlinear magnetic textures and the chiral magnetic field associated with weyl fermions, extending the longitudinal and transverse transport physics and providing novel degrees of freedom in the spintronic applications of emerging topological magnets.

关键词： hard-magnetic material magnetic weyl semimetal magnetoresistance Hall effect

在线全文

学校读者我要写书评

暂无评论

汉英翻译文学批评的困惑及其哲学思考

外国语 2017年第2期40卷 73-80页

作者：王恩科贵州师范大学外国语学院贵州贵阳550001

某些汉语文学作品的英译本在西方的接受情况与我国许多批评者的高度赞赏并不相符,对此翻译界鲜有系统、令人信服的反思。本文借鉴价值哲学理论,从价值主体的确定、评价主体与价值主体的关系、评价尺度的来源等三个方面予以分析,指出翻... 详细信息

某些汉语文学作品的英译本在西方的接受情况与我国许多批评者的高度赞赏并不相符,对此翻译界鲜有系统、令人信服的反思。本文借鉴价值哲学理论,从价值主体的确定、评价主体与价值主体的关系、评价尺度的来源等三个方面予以分析,指出翻译文学批评中价值主体的错位、评价主体与价值主体的混淆都首先导致评价尺度的误判,进而造成评价结论的偏颇;除此之外,翻译文学批评中过分强调译者传递源语文化的责任而忽视译本审美功能的做法,是十分明显的评价尺度错位,同样带来评价结果的偏误。

关键词：翻译文学批评价值主体评价主体评价尺度价值哲学

在线全文

学校读者我要写书评

暂无评论

直流燃烧器参数对氧煤燃烧特性的影响

同济大学学报（自然科学版） 2016年第8期44卷 1253-1259页

作者：刘若晨安恩科同济大学机械与能源工程学院上海201804

以Φ200 mm×2 m的火焰炉为对象,借助软件FLUENT研究了在O_2/CO_2气氛下燃烧器射流动量比和射流间距的改变对炉内流场特性和燃烧特性的影响.结果表明:当射流动量比由28增至66时,烟气内循环率峰值呈现先增大后减小的趋势,混合区烟气内循... 详细信息

以Φ200 mm×2 m的火焰炉为对象,借助软件FLUENT研究了在O_2/CO_2气氛下燃烧器射流动量比和射流间距的改变对炉内流场特性和燃烧特性的影响.结果表明:当射流动量比由28增至66时,烟气内循环率峰值呈现先增大后减小的趋势,混合区烟气内循环率的整体水平是在射流动量比为48时最大;随着射流间距的增大,Oxz轴面回流区向下游偏移,且氧气质量分数高于10%的区域逐渐缩小,燃烧峰值有所降低,当射流间距增至75mm时,Oxz轴面回流区的范围明显缩小,反应区氧气体积分数回升,使得燃烧峰值升高.同轴射流方式下的燃烧峰值最高,约2 200K,仅当射流间距为60mm工况下的炉膛燃烧最大温升小于煤粉的着火温度(790 K),即可实现氧煤MILD(moderate or intensive low oxygen dilution,温和)燃烧.

关键词：氧煤燃烧 MILD燃烧大速差同向射流烟气内循环气相预热混合区

在线全文

学校读者我要写书评

暂无评论

翻译文学批评中的价值主体与评价主体研究

外国语 2015年第5期38卷 82-87页

作者：王恩科贵州师范大学外国语学院贵州贵阳550001

从价值哲学的角度认识翻译文学批评是翻译文学批评研究的一个全新视角,目前学界对其中的价值主体与评价主体的认识存在一定的模糊和偏误,从而使得这一新的批评理论体系存在某种缺憾。本文详细阐释了翻译文学的价值主体和评价主体,指出... 详细信息

从价值哲学的角度认识翻译文学批评是翻译文学批评研究的一个全新视角,目前学界对其中的价值主体与评价主体的认识存在一定的模糊和偏误,从而使得这一新的批评理论体系存在某种缺憾。本文详细阐释了翻译文学的价值主体和评价主体,指出价值主体的确认是翻译文学评价的基础,价值主体的需要是评价标准的尺度来源;同时认为,翻译文学批评中的评价主体与价值主体既可能完全或部分重合,也可能相互分离,即使是完全和部分重合,逻辑上的区分也是十分重要的,否则极易影响翻译文学批评的有效性和合理性。

关键词：翻译文学价值哲学价值主体评价主体

浅埋煤层过沟开采覆岩破坏特征及水害防治技术研究

在线全文

学校读者我要写书评

暂无评论

煤炭技术 2024年第1期43卷 148-152页

作者：李民峰雷方超侯恩科杜超杰冯栋刘凡凡陕西涌鑫矿业有限责任公司陕西府谷719400 西安科技大学地质与环境学院西安710054

黄土沟壑区溃水水害是浅埋煤层开采的主要灾害之一。安山煤矿煤层埋藏浅、局部沟道所在区域5-2煤层顶板距离地表不足30 m,为了解决黄土沟壑区工作面过沟开采可能遇到的水害问题,通过数值模拟的手段研究了工作面过沟开采时的覆岩破坏特征... 详细信息

黄土沟壑区溃水水害是浅埋煤层开采的主要灾害之一。安山煤矿煤层埋藏浅、局部沟道所在区域5-2煤层顶板距离地表不足30 m,为了解决黄土沟壑区工作面过沟开采可能遇到的水害问题,通过数值模拟的手段研究了工作面过沟开采时的覆岩破坏特征,提出了研究区过沟开采时冒裂安全性分区标准,并基于分区结果提出了预防工作面过沟开采发生溃水水害事故的防治技术,过沟开采防治技术包括采前筑坝截流引流,采后工作面地表裂缝修复等,并在工作面过沟开采区域成功地进行了防治应用,应用结果表明,防治技术能够有效预防工作面过沟开采溃水水害。研究成果对榆神矿区工作面安全、绿色高效过沟开采具有一定的借鉴意义。

关键词：过沟开采黄土沟壑区地裂缝修复截流引流

在线全文

学校读者我要写书评

暂无评论

氨载氢技术经济性分析

同济大学学报（自然科学版） 2010年第9期38卷 1371-1374页

作者：安恩科张伟同济大学热能与环境工程研究所上海201804

液氨做为一种含氢质量分数为17.6%的富氢物质,是氢能的理想载体.从目前氢气存储和运输的瓶颈问题出发,设计了以液氨为储氢和输氢载体的供氢方案,并以单位质量的氢气供应成本做为评价指标,对该路线与天然气、电解水和甲醇裂解制氢供氢路... 详细信息

液氨做为一种含氢质量分数为17.6%的富氢物质,是氢能的理想载体.从目前氢气存储和运输的瓶颈问题出发,设计了以液氨为储氢和输氢载体的供氢方案,并以单位质量的氢气供应成本做为评价指标,对该路线与天然气、电解水和甲醇裂解制氢供氢路线进行了经济性的比较分析.结果表明,在中等制氢规模和近距离运输的模式下,氨载氢供氢方案一次投资单位供氢成本仅为51.2元.kg-1,明显低于其他制氢路线,具有较强的经济性和技术可行性.

关键词：氨载氢方案设计供氢成本经济性分析

Si_(1-x)Ge_(x)/Si Single-Mode Rib Waveguides with 0.5 dB/cm by Molecular Beam Epitaxy

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 1994年第12期11卷 734-736页

作者： GAO Yong LIU enke LI Guozheng LIU Xiding ZHANG Xiangjiu LU Xuekun wang Xun Electronic Engineering Department Xi’an Jiaotong UniversityXi’an 710049 Surface physics National Key Laboratory Fudan UniversityShanghai 200433

Si_(1-x)Ge_(x)/Si single-mode rib waveguides with 0.5dB/cm losses have been fabricated,in which the SiGe layers are grown by molecular beam *** single-mode waveguide dimensions determined experimentally are consistent... 详细信息

关键词： waveguide SiGe Epitaxy