基于Matlab分析负荷对多联机IPLV的影响

多联机有其特殊的优点,但是不同部分负荷的组合对IPLV的影响仍需进一步研究。文中建立IPLV与部分负荷的相关公式,运用MATLAB软件分析不同卸载级负荷与IPLV的关系,从而确定不同部分负荷的最优组合。     

Remarks on KdV-type flows on star-shaped curves

We study the relation between the centro-affine geometry of star-shaped planar curves and the projective geometry of parametrized maps into RP¹. We show that projectivization induces a map between differential invariants and a bi-Poisson map between Hamiltonian structures. We also show that a Hamiltonian evolution equation for closed star-shaped planar curves, discovered by Pinkall, has the Schwarzian KdV equation as its projectivization. (For both flows, the curvature evolves by the KdV equation.) Using algebro-geometric methods and the relation of group-based moving frames to AKNS-type representations, we construct examples of closed solutions of Pinkall’s flow associated with periodic finite-gap KdV potentials.     

Point defects on graphene on metals

Understanding the coupling of graphene with its local environment is critical to be able to integrate it in tomorrow's electronic devices. Here we show how the presence of a metallic substrate affects the properties of an atomically tailored graphene layer. We have deliberately introduced single carbon vacancies on a graphene monolayer grown on a Pt(111) surface and investigated its impact in the electronic, structural, and magnetic properties of the graphene layer. Our low temperature scanning tunneling microscopy studies, complemented by density functional theory, show the existence of a broad electronic resonance above the Fermi energy associated with the vacancies. Vacancy sites become reactive leading to an increase of the coupling between the graphene layer and the metal substrate at these points; this gives rise to a rapid decay of the localized state and the quenching of the magnetic moment associated with carbon vacancies in freestanding graphene layers.     

五边形石墨烯负载Pt单原子稳定性能的应变调控

基于密度泛函理论的第一性原理计算方法,研究了Pt原子在五边形石墨烯(PG)上的吸附与动力学行为.研究结果表明,单个Pt原子在PG上虽然具有较大的吸附能及较高的扩散势垒,却不能够在衬底形成均匀分散的单原子.这是因为,随Pt原子数增加,Pt_n(n=1, 2, 3)在PG上的平均结合能也逐渐增加,更倾向于形成团簇,该发现有效否定了之前的报道称Pt能在PG上形成稳定的单原子催化剂这一结论(Phys. Chem. Chem. Phys. 21, 12201 (2019)).基于此,我们考虑对PG施加双轴应变,随着拉伸应力增加,Pt金属原子间的平均结合能逐渐降低,当拉伸应变施加至12%左右时,单个Pt在衬底上的结合能与Pt₂在衬底上的平均结合能相等,从而实现PG上均匀分散的Pt单原子催化剂.该结果对五边形石墨烯基材料应变调控实现单原子催化剂提供理论借鉴.     

基于光纤Bragg光栅位移测量的研究

介绍了一种基于布喇格光纤光栅技术的位移测量方法。利用宽带光源经不同的布喇格光栅得到一种由温度稳定器控制波长稳定性的合成光源。由于系统设计的合成光源波长比常规光源的波长长，所以允许的光程差测量范崮提高了几百倍，从而使得布喇格光纤光栅的波长准确性提高了干涉仪位移测量的准确性。此外，利用光外差法马赫一曾德尔干涉仪进行了位移测量实验，得到了很好的效果。     

用超高速阴影摄影技术研究微喷射现象

以转镜式高速分幅相机作为记录载体,设计并建立了高速阴影系统。用该摄影系统研究在爆轰加载下金属表面的微喷射现象,以及由此产生的波阵面发展过程。通过获取的阴影图像观察到了带有特定形状缺陷（矩形槽、盲孔）锡自由表面的微喷射演变过程,给出了微射流的形状,冲击波阵面以及喷射物头部的运动速度等物理信息。     

基于F-P腔标准具的色散补偿器件的研究

介绍了标准具的结构,分析了基于标准具补偿色散的原理,讨论了该方案在光纤通信系统中的应用前景。     

Strangeness production on the nucleon and on nuclei

The coupled-channel Giessen Model is used to investigate meson production on the nucleon simultaneously in reactions with hadrons and the photon. The essential aspects of the model are discussed. Results for strangeness producing KΛ reactions on the proton and eta photoproduction on the proton and the neutron, respectively, are presented. A resonance model is used to explore the production of hypernuclei in proton and photon induced reactions.     

A note on recurrent random walks on graphs

We consider random walks on polynomially growing graphs for which the resistances are also polynomially growing. In this setting we can show the same relation that was found earlier but that needed more complex conditions. The diffusion speed is determined by the geometric and resistance properties of the graph.     

基于多处理器的视频跟踪系统研究

传统视频跟踪系统的目标检测环节常采用手动指定或使用单处理器运算来确定跟踪目标,这种方法耗费人力且检测速度慢。针对此问题提出了一种改进的图像分割方法,该方法采用多处理器系统构架,并行处理分割区域,增加了检测目标的速度,并且在后续目标跟踪环节中,各处理器根据任务划分,协同处理跟踪任务。实验结果表明基于多处理器系统构架的视频跟踪系统能够实现快速自动检测与跟踪目标,系统加速比为2．066,处理器效率为51．65％。     

X-ray diffraction on chlorine adsorbed on graphite

Cl₂ layers adsorbed on Grafoil have been investigated by X-ray diffraction between 78 and 285 K. Mono- and submonolayers crystallize in a parallelogram lauttce, incommensurate with the (001) graphite surfaces, the molecules oriented almost perpendicular to the surface. The structure is closely related to that of the (001) planes of three-dimensional solid chlorine. For coverages above the monolayer completion bulk crystalization sets in.     

基于高光谱成像的纸质文物“狐斑”检测方法研究

受保存条件影响,很多纸质文物表面会形成狐斑（foxing）,如果不能进行有效监测和科学判断,会进而影响纸质文物安全。纸质文物狐斑病害检测存在滞后性、主观性等问题,对于书画藏品被墨色、颜料及印章等覆盖的区域更是难以通过肉眼进行识别,因此,基于文物的预防性保护理念,亟待开发对于狐斑高效、精确识别的无损检测技术。可见光-近红外高光谱图像结合了光谱和图像,包含丰富的空间信息与光谱信息,可以实现无损批量地平面采集样本光谱信息。该研究提出一种基于高光谱成像技术检测纸质文物狐斑的快速识别方法,获取模拟纸质文物在360～970 nm的高光谱图像,因360～450 nm受噪声影响过大,所以选择剔除这部分光谱数据;选取感兴趣区域并获取相应的平均光谱反射率,比较健康区域与被狐斑感染区域,发现两者的光谱曲线存在差异;在450～600 nm附近,受狐斑影响区域比健康区域的光谱反射率偏高,并在600 nm附近出现波峰形态;而在600～900 nm范围内,被感染区域与健康区域的光谱都趋于平稳,两者之间差异逐渐减小。选取从特征波长对应的图像中提取的特征信息建立图像识别模型,运用波段运算观察狐斑图像特征,狐斑的大小和分布情况都能清晰地显示,但与印章和墨迹重叠部分,狐斑被印章和墨迹遮盖,难以识别;利用最小噪声分离,虽然不同部分有重叠,但能发现仅凭肉眼难以识别的隐藏的狐斑;180条高光谱数据（450～970 nm）建立狐斑判别模型,随机地分为120条数据为训练集,60条数据为测试集,应用K-近邻法与BP神经网络建立纸质文物狐斑光谱判别模型,总体上两种方法对狐斑判别率分别达到73.3%和85%;BP神经网络相较于K-近邻模型,总体判别率更高,识别效果也更好。结果表明,利用高光谱成像可高效准确识别纸质文物狐斑,为后续研究狐斑分布发展提供可靠的技术手段,也为博物馆馆藏文物的保存提供指导意见。     

Comment on: Ising models on hyperbolic graphs

New proofs are given for Propositions 1 and 2 of C. C. Wu,J. Stat. Phys. 50:251 (1996). The propositions involved upper and lower bounds on the critical temperature for these models. Besides being more direct than the previous proofs, the new proofs improve both bounds.     

Comment on Keizer's critique on extended irreversible thermodynamics

Keizer's critique on extended irreversible thermodynamics is responded and qualified so as to remove misleading points of his statements. It is particularly pointed out that contrary to his assertion, fluctuating irreversible thermodynamics may be regarded as being included in extended irreversible thermodynamics as a special case, since it is derivable from the latter when the relaxation times of fluxes are comparatively shorter than the hydrodynamic relaxation time and the initial conditions for the evolution equations are random.Work supported by the grants from the Natural Sciences and Engineering Research Council of Canada.     

基于MEMS陀螺仪的随机误差分析

为了提高MEMS陀螺仪测量精度,减少随机误差的影响,对产生随机误差的噪声源及其随机误差模型进行了分析。通过分析MEMS陀螺仪自身结构的缺陷并且对其输出数据进行了相应的滤波处理与平稳性检验,确立了合适的误差模型并利用Kalman滤波进行误差补偿,验证了模型的有效性。同时运用Allan方差法对MEMS陀螺仪噪声项进行了分析,确定了影响MEMS陀螺仪测量性能的主要因素以及比较了滤波前后的各项噪声源系数,检验了滤波效果且实验结果证明误差模型显著提高了MEMS陀螺仪的测量精度。     

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对EAST装置偏滤器位形的放电中发生的垂直位移不稳定性的全过程进行了模拟,计算了磁轴垂直位移及垂直位移不稳定性的增长率。模拟的结果与实验结果符合得较好。     

双漏斗肥皂膜实验的研究

研究双漏斗肥皂膜实验中肥皂膜的形状、特性以及它随两漏斗距离的变化过程.从理论上导出并经实验验证一个重要结论:两漏斗口的最大距离等于其半径的1.325倍,然而这一点常常被忽视.     

热自然对流对热声起振行为的研究

主要研究热自然对流对热声发动机系统的影响。通过一系列的实验 ,发现热声发动机空间位置的变化对行波型热声机的起振温度、回热器的温度分布等重要参数有着相当大的影响。作者通过分析 ,对该现象进行了定性的解释。