Effect of Different Local Vibration Frequencies on the Multiscale Regularity of Plantar Skin Blood Flow

Local vibration has shown promise in improving skin blood flow (SBF). However, there is no consensus on the selection of the best vibration frequency. An important reason may be that previous studies utilized time- and frequency-domain parameters to characterize vibration-induced SBF responses. These parameters are unable to characterize the structural features of the SBF response to local vibrations, thus contributing to the inconsistent findings seen in vibration research. The objective of this study was to provide evidence that nonlinear dynamics of SBF responses would be an important aspect for assessing the effect of local vibration on SBF. Local vibrations at 100 Hz, 35 Hz, and 0 Hz (sham vibration) with an amplitude of 1 mm were randomly applied to the right first metatarsal head of 12 healthy participants for 10 min. SBF at the same site was measured for 10 min before and after local vibration. The degree of regularity of SBF was quantified using a multiscale sample entropy algorithm. The results showed that 100 Hz vibration significantly increased multiscale regularity of SBF but 35 Hz and 0 Hz (sham vibration) did not. The significant increase of regularity of SBF after 100 Hz vibration was mainly attributed to increased regularity of SBF oscillations within the frequency interval at 0.0095–0.15 Hz. These findings support the use of multiscale regularity to assess effectiveness of local vibration on improving skin blood flow.     

Order of the smallest counterexample to Gallai’s conjecture

In 1966, Gallai conjectured that all the longest paths of a connected graph have a common vertex. Zamfirescu conjectured that the smallest counterexample to Gallai’s conjecture is a graph on 12 vertices. We prove that Gallai’s conjecture is true for every connected graph G with α′(G) ≤ 5, which implies that Zamfirescu’s conjecture is true.     

同步辐射的发现、特性及其应用领域的开拓

同步辐射是由电子同步加速器或储存环提供的强电磁辐射源 .近年来 ,同步辐射已经发展成为多学科的研究工具 ,取得了许多重要研究成果 ,并展现出广阔的应用前景 ,日益受到人们的重视 ,本文对诸方面作出综述     

涡流管内三维强旋转流场数值模拟与分析

涡流管内可压缩气体的强旋转流动是涡流管能量分离的根本原因和驱动力,因而涡流管内流场研究是揭示涡流管能量分离物理机制的首要关键问题。由于涡流管内可压缩气体的三维强旋转湍流流动,实验测量中存在诸多问题,而CFD数值模拟技术对此具有很大的优势。文中以涡流管内部流场为研究对象,建立了涡流管计算域模型并进行网格划分,讨论了边界条件、湍流模型以及线性方程组求解策略等问题,对不同冷气流率下的涡流管内三维强旋流流场结构特性进行数值模拟,获得了不同冷气流率下的旋转运动、轴向运动、径向运动和循环流的分布特性。研究表明Realizableκ-ε湍流模型能够充分反映强旋流动特点,数值模拟结果与文献中实验值基本吻合。     

涡流管能量分离物理机制研究进展

发生在涡流管内的流动规律以及由此所产生的能量分离效应异常复杂。至今没有一种精确的理论能够从本质上解释其效应。但仍有研究者提出了各种各样的理论模型,以期揭示其能量分离物理机制。就国内外对涡流管能量分离效应物理机制的研究动态及成果作了较全面的论述,根据今后涡流管的发展方向,对下一步的研究工作给予了前景性的展望,提出了进一步开展涡流管相关研究工作应解决的问题与途径。     

Regularized semigroups of bounded semivariation

We use regularized semigroups to consider local linear and semilinear inhomogeneous abstract Cauchy problems on a Banach space in a unified way. We show that the inhomogeneous abstract Cauchy problem {fx43-1} has a unique classical solution, for allf εC([0,T], [Im(C)]),x inC(D(A)), if and only ifA generates aC-regularized semigroup of bounded semivariation, and has a strong solution for allf εL ¹ ([0,T], [Im(C)]),x εC(D(A)) if and only if theC-regularized semigroup is what we call of bounded super semivariation. This includes locally Lipschitz continuousC-regularized semigroups. We give similar simple sufficient conditions for the semilinear abstract Cauchy problem {fx43-2} to have a unique solution. Well-known results for generators of strongly continuous semigroups, as well as more recent results for Hille-Yosida operators, originally due to Da Prato and Sinestrari, regarding (0.1), are immediate corollaries of our results. Results due to Desch, Schappacher and Zhang, on (0.2), for generators of strongly continuous semigroups, are similarly generalized to Hille-Yosida operators with our approach. This article appeared in the last issue of the Forum. However, due to an error by the Journal Secetary, the Abstract was omitted, and with it the equations which are the focus of the article. We therefore are reprinting the article in its entirety. The Journal Secretary regrets the error.     

普通话声母和韵母的统计特性

本文对普通话书面语中声母、韵母的动态与静态分布特性及其差异作了统计分析，结果表明：普通话声母间的、韵母的动态与表态的相对分布关系一致，语音间的相对分布主要与发声系统有关，不受频度的影响。普通话声母、韵母的动态与静态的出现率差异，与声母发音方法和韵线组合结构、声母发音部位与韵母四呼的配合关系、音节的成字率和字的频度有关，主要受送气与不送气声母、韵母的动态与静态的出现率差异最大，多音节词中的韵母的动态     

阵列波导光栅复用/解复用器焦场的数值分析

本文利用标量波动衍射理论分析了AWG系统焦场分布,数值计算了阵列波导光栅系统的焦场分布,此方法简便,对器件的优化设计有一定的指导意义.     

112例遗尿症小儿发中六种元素的分析

收集了遗尿症患儿１１２名，测定了其发中钙，锰，铁，铜，锌，铜六种元素，并与正常同年龄同性别组对照，结果男性患儿发钙下降（Ｐ〈０．０１），发锰下降（Ｐ〈０．０５），发铜升高（Ｐ〈０．０１），综合男女患儿发样，其中男性与女性患儿的发锰，钙均下降，相一致，遗尿症中医辨证属于虚证，所属脏腑为肾。微量元素锰的缺乏与肾虚有密切关系，本结果提示缺锰可作为遗尿症的参数指标之一。