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Electric field dependence of spin qubit in a Si-MOS quantum dot

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Chinese Physics B 2024年第6期33卷 248-253页

作者：马荣龙倪铭周雨晨孔真真王桂磊刘頔罗刚曹刚李海欧郭国平 CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Microelectronics Devices and Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China Beijing Superstring Academy of Memory Technology Beijing 100176China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China Origin Quantum Computing Company Limited Hefei 230026China

Valley, the intrinsic feature of silicon, is an inescapable subject in silicon-based quantum computing. At the spin–valley hotspot, both Rabi frequency and state relaxation rate are significantly enhanced. With protection against charge noise, the valley degree of freedom is also conceived to encode a qubit to realize noise-resistant quantum ***, based on the spin qubit composed of one or three electrons, we characterize the intrinsic properties of valley in an isotopically enriched silicon quantum dot(QD) device. For one-electron qubit, we measure two electric-dipole spin resonance(EDSR) signals which are attributed to partial occupation of two valley states. The resonance frequencies of two EDSR signals have opposite electric field dependences. Moreover, we characterize the electric field dependence of the upper valley state based on three-electron qubit experiments. The difference of electric field dependences of the two valleys is 52.02 MHz/V, which is beneficial for tuning qubit frequency to meet different experimental requirements. As an extension of electrical control spin qubits, the opposite electric field dependence is crucial for qubit addressability,individual single-qubit control and two-qubit gate approaches in scalable quantum computing.

关键词： silicon-based quantum computing valley electric-dipole spin resonance

Norwegian scabies presenting as erythroderma:A case report

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World Journal of Clinical Cases 2024年第21期12卷 4802-4806页

作者： hai-Ju Chen Chun-Ying Lu guo-Mei Huang Lu-Lu Tang Department of Dermatology and Venereology The Second Affiliated Hospital of Guangxi Medical UniversityNanning 530007Guangxi Zhuang Autonomous RegionChina

BACKGROUND Norwegian scabies(NS)is a serious parasitic skin *** NS is one of the causes of erythroderma,it is frequently ***,it is essential to raise awareness regarding NS presenting as *** SUMMARY We present a case of NS that persisted for more than 3 *** following nonstandard treatment,the patient’s rash worsened and gradually progressed into ***,NS was diagnosed by skin microscopy and *** When patients with pruritic dermatosis have high-risk factors such as prolonged bed rest and immunodeficiency,clinicians need to enhance their awareness of NS and ensure prompt diagnosis and treatment.

关键词： Norwegian scabies Crusted scabies Erythroderma Diagnosis Case report

Well-posedness and Global Attractors for the Burgers-Ginzburg-Landau Equations

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Acta Mathematicae Applicatae Sinica 2002年第4期18卷 579-588页

作者： Bo-ling guo, hai-yang HuangCenter of Nonlinear Studies, Institute of Applied Physics and Computational Mathematics. P.O. Box 8009. Beijing 100088, ChinaDepartment of Mathematics. Beijing Normal University, Beijing 100875, China Center of Nonlinear Studies Institute of Applied Physics and Computational Mathematics Beijing 100088 Department of Mathematics Beijing Normal University 北京 100875

In this paper we consider the Burger-Ginzburg-Landau equations, and prove the existence of the global attractor in with finite Hausdorff and fractal dimensions.

关键词： Burger-Ginzbur-Landau equations Mild solution Hausdorff and fractal dimensions. Global attractor

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桥塔结构火灾温度荷载模型及效应分析

长安大学学报（自然科学版） 2024年第4期44卷 66-76页

作者：王佐才郭战徐京海李阳辛宇合肥工业大学土木与水利工程学院安徽合肥230009 安徽省道路与桥梁检测工程研究中心安徽合肥230009 中国铁路上海局集团有限公司上海200071

为研究火灾对桥塔结构的影响,提出桥塔近火面的火灾温度荷载模型,并对全塔结构的火灾效应进行分析。以高345 m的钢-混组合桥塔作为研究对象,设定7种火灾场景,采用火灾动力学仿真软件(fire dynamics simulator, FDS)获取不同火灾场景下... 详细信息

为研究火灾对桥塔结构的影响,提出桥塔近火面的火灾温度荷载模型,并对全塔结构的火灾效应进行分析。以高345 m的钢-混组合桥塔作为研究对象,设定7种火灾场景,采用火灾动力学仿真软件(fire dynamics simulator, FDS)获取不同火灾场景下桥塔近火面的温度分布。基于距离和高度参数建立近火面火灾温度荷载模型公式。以温度荷载模型为输入,计算获得桥塔壁面内部的瞬态温度场,通过顺序耦合力场分析桥塔在火灾下的力学性能。研究结果表明:火源与塔面距离较近时,火焰会发生贴壁现象,近火面温度较高且温度沿着桥塔高度方向逐渐降低;火源与塔面距离较远时,近火面整体温度较低,桥塔倾斜使近火面的最高温度出现在火焰距离桥塔最近高度上;在桥塔厚度方向,温度沿着厚度方向迅速降低且温度上升起点逐渐滞后;不同火灾场景下桥塔的最大应力取决于近火面温度,应力集中在近火面温度较高的区域;随着火灾的发展,应力集中区域由高温区域逐渐向低温区域发展;近火面温度较低时,热膨胀效应会引起桥塔发生远离火源方向的侧向位移,而温度较高会导致近火面及其内部材料的承载能力大幅下降,侧向位移靠近火源方向发展;桥塔施工期间发生火灾引起的侧向位移较运营期间更小。

关键词：桥梁工程桥塔温度荷载模型火灾动力学火灾效应温度场

基于压电致动器的水下柔性推进结构振动特性研究

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船舶力学 2024年第8期28卷 1287-1296页

作者：金爱国金贵阳胡燕海宁波职业技术学院智能装备研究所浙江宁波315800 宁波大学机械工程与力学学院浙江宁波315211

压电纤维(Macro Fiber Composite,MFC)致动器因其柔韧性好、致动力大、防水性能优异等特点越来越受到人们的关注,并在智能传感/致动、能量采集、水下仿生机器人等领域得到了广泛的应用。本文旨在研究MFC驱动水下柔性结构的振动特性与动... 详细信息

压电纤维(Macro Fiber Composite,MFC)致动器因其柔韧性好、致动力大、防水性能优异等特点越来越受到人们的关注,并在智能传感/致动、能量采集、水下仿生机器人等领域得到了广泛的应用。本文旨在研究MFC驱动水下柔性结构的振动特性与动力学响应。计算得到MFC致动器驱动力,根据莫里森半经验公式推导得到流体附加惯性力和附加阻尼力。基于欧拉-伯努利梁理论、假设模态法和第二类拉格朗日方程,建立MFC致动的水下柔性结构耦合非线性动力学模型,采用谐波平衡法将非线性阻尼线性化。数值仿真和实验结果表明:粘贴了MFC致动器的柔性梁结构局部刚度增大,实测模态振型与仿真模态振型基本一致;受周围流体水动力的影响,MFC致动悬臂梁水下前两阶共振频率与动态响应下降明显;模型预测的幅频响应曲线与实测曲线吻合较好,证实了所建耦合动力学模型的有效性。本研究可为基于智能材料的水下仿生推进装置提供参考。

关键词：压电纤维致动器柔性结构振动特性动力学响应水下仿生推进装置

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半导体量子计算芯片

中国科学：信息科学 2024年第1期54卷 102-109页

作者：张建军李海欧郭国平中国科学院物理研究所北京100190 中国科学技术大学中国科学院量子信息重点实验室合肥230026 合肥国家实验室合肥230088

近年来,量子计算受到国内外越来越广泛的关注,美国、欧洲、日本和澳大利亚等国都投入了大量资金,量子计算应用研究成果开始涌现.在众多的量子计算物理系统中,半导体量子计算因具有与现有集成电路工艺兼容及可扩展、可集成的优点而备受重... 详细信息

近年来,量子计算受到国内外越来越广泛的关注,美国、欧洲、日本和澳大利亚等国都投入了大量资金,量子计算应用研究成果开始涌现.在众多的量子计算物理系统中,半导体量子计算因具有与现有集成电路工艺兼容及可扩展、可集成的优点而备受重视.本文在介绍国内外半导体量子计算研究进展的基础上,探讨半导体量子计算发展中面临的关键科学技术难题,以及未来半导体量子计算规模化、集成化、产线化的发展趋势.

关键词：硅锗量子点量子比特量子计算

Bi^(3+)、Eu^(3+)共掺杂La_(4)GeO_(8)荧光粉的制备及可调发光

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发光学报 2024年第3期45卷 450-457页

作者：张文娜黎仲寅马纪涛陈娅鹏杨菲郭海南宁理工学院文理学院广西南宁530100 浙江师范大学物理系浙江金华321004

为了开发出高效稳定的单一基质白光发射荧光材料,本工作通过高温固相法成功合成了一系列La_(4)GeO_(8)∶Bi^(3+),Eu^(3+)荧光粉样品,并通过X射线衍射、室温光谱、变温光谱等手段研究了实验样品的结构与发光性能。研究发现,Bi^(3+)离子... 详细信息

为了开发出高效稳定的单一基质白光发射荧光材料,本工作通过高温固相法成功合成了一系列La_(4)GeO_(8)∶Bi^(3+),Eu^(3+)荧光粉样品,并通过X射线衍射、室温光谱、变温光谱等手段研究了实验样品的结构与发光性能。研究发现,Bi^(3+)离子在该结构中占据两种不同的格位(Bi^(3+)(Ⅰ)和Bi^(3+)(Ⅱ)),且在紫外光激发下呈现两个峰值分别在475 nm和620 nm的宽带发射。对于Bi^(3+)、Eu^(3+)共掺样品,由于Bi^(3+)(Ⅰ)与Eu^(3+)之间的竞争吸收、Bi^(3+)(Ⅰ)至Bi^(3+)(Ⅱ)以及Bi^(3+)(Ⅱ)至Eu^(3+)的能量传递作用,可实现蓝色至红色、橙红色至红色的可调发光。特别地,样品La_(4)GeO_(8)∶0.07Bi^(3+),0.06Eu^(3+)在313 nm光激发下可获得CIE值为(0.335,0.319)的优异白色发光。此外,该白光发射材料具有较佳的发光热稳定性,当温度升高至380 K时,发光积分强度仍然为室温的59%,表明其在白光二极管上具有潜在的应用价值。

关键词： La_(4)GeO_(8)∶Bi^(3+),Eu^(3+) 可调发光发光热稳定性白光二极管

Mutation in a non-force-bearing region of protein L influences force-dependent unfolding behavior

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Chinese Physics B 2024年第7期33卷 624-629页

作者：蒋环杰王艳伟陈家媛胡丹潘海郭子龙陈虎 Department of Physics Wenzhou UniversityWenzhou 325035China Center of Biomedical Physics Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhou 325000China Research Institute for Biomimetics and Soft Matter Fujian Provincial Key Laboratory for Soft Functional Materials ResearchDepartment of PhysicsXiamen UniversityXiamen 361005China

Single-molecule magnetic tweezers(MTs) have revealed multiple transition barriers along the unfolding pathway of several two-state proteins, such as GB1 and Csp. In this study, we utilized MTs to measure the force-dependent folding and unfolding rates of both protein L(PLWT) and its Y47W mutant(PLY47W) where the mutation point is not at the force-bearing β-strands. The measurements were conducted within a force range of 3–120 pN. Notably, the unfolding rates of both PLWT and PWY47W exhibit distinct force sensitivities below 50 pN and above 60 pN, implying a two-barrier free energy landscape. Both PLWT and PLY47W share the same force-dependent folding rate and the same transition barriers,but the unfolding rate of PLY47W is faster than that of PLWT. Our finding demonstrates that the residue outside of the force-bearing region will also affect the force-induced unfolding dynamics.

关键词： protein folding magnetic tweezers protein L

Effect of interlayer bonded bilayer graphene on friction

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Chinese Physics B 2024年第8期33卷 389-395页

作者：李耀隆田振国尹海峰张任良 Hebei Key Laboratory of Mechanical Reliability for Heavy Equipment and Large Structures Yanshan UniversityQinhuangdao 066004China School of Civil Engineering and Mechanics Yanshan UniversityQinhuangdao 066004China

We study the friction properties of interlayer bonded bilayer graphene by simulating the movement of a slider on the surface of bilayer graphene using molecular *** results show that the presence of the interlayer covalent bonds due to the local sp^(3) hybridization of carbon atoms in the bilayer graphene seriously reduces the frictional coefficient of the bilayer graphene surface to 30%,depending on the coverage of interlayer sp^(3) bonds and normal *** a certain coverage of interlayer sp3bonds,when the normal load of the slider reaches a certain value,the surface of this interlayer bonded bilayer graphene will lose the friction reduction effect on the *** findings provide guidance for the regulation and manipulation of the frictional properties of bilayer graphene surfaces through interlayer covalent bonds,which may be useful for applications of friction related graphene based nanodevices.

关键词： nanoscale friction molecular dynamic simulation bilayer graphene interlayer covalent bond