Improved synchronization criteria of Lur’e systems under sampled-data control

Nonlinear Dynamics - In this paper, we address the issue of $$\mathcal {H}_{\infty }$$ synchronization for two identical chaotic systems with time-varying delays and uncertainties under...     

Fuzzy model-based nonfragile control of switched discrete-time systems

Nonlinear Dynamics - This paper is concerned with the problem of nonfragile control for a class of fuzzy switched systems with mode-dependent time-varying delays. By constructing novelty Lyapunov...     

ODB++文件转换为可编辑PCB板图研究

目前各EDA软件无法互相读取其输出的PCB板图文件。针对以上问题,文中提出以ODB++标准为中间媒介的方法以达到EDA软件输出的PCB信息可互相读取的目的。因软件均可输出ODB++文件,文中只研究ODB++文件转换为可编辑PCB板图的方法。从实验结果可看出该方法实现了预期目的。     

融入音乐子人格特质和社交网络行为分析的音乐推荐方法

为了可以实时推荐符合人们情感状态的音乐,提出了一种融入音乐子人格特质的社交网络行为分析的音乐推荐算法,该算法通过分析用户发表在微博等社交媒体上的状态,计算用户在该情感状态下对音乐的偏好程度;选择在该情感状态下音乐偏好相似的最近邻用户,最后融入音乐子人格特质进行偏好度计算,为用户推荐最适合其情感状态的音乐。实验结果表明,该算法可以缓解用户数据稀疏性对推荐结果的影响,能够提高推荐系统的推荐质量。     

超高效合相色谱-质谱法快速分析食用植物油中常见脂肪酸

建立了超高效合相色谱-质谱(UPC²-MS)快速分析6种食用植物油(玉米油、葵花籽油、大豆油、茶油、菜籽油、花生油)中棕榈酸、硬脂酸、油酸、亚油酸、亚麻酸等5种常见脂肪酸的方法,并比较了这6种食用油中上述5种脂肪酸的含量差异。采用皂化反应对植物油进行前处理,以ACQUITY UPC² BEH 2-EP色谱柱(100 mm×2.1 mm, 1.7 μm)为分析柱,以超临界CO₂-甲醇/乙腈(1:1, v/v)为流动相进行梯度洗脱,流速为0.8 mL/min。在电喷雾负离子模式下进行检测,外标法定量。结果表明:5种脂肪酸标准物质在0.5~100 mg/L范围内呈现良好的线性关系,相关系数为0.9985~0.9998,定量限(S/N≥10)为0.15~0.50 mg/L;在3个添加水平下,样品的加标回收率为89.61%~108.50%;方法重复性的相对标准偏差(RSD)为0.69%~3.01%。该方法简单、快速、分离效果好,无需对脂肪酸样品进行衍生化,已成功地用于玉米油、葵花籽油、橄榄油、茶油、大豆油和花生油等6种食用油中常见脂肪酸含量的测定。     

锁核酸分子信标在分子识别与生物分析中的应用

分子信标是一种荧光探针,闭合时呈发夹结构。其5'末端修饰荧光基团,3'末端修饰猝灭基团。当目标存在时,环部与目标结合,发夹打开,发出荧光。锁核酸是一类双环状寡核苷酸衍生物,能够遵循碱基互补配对原则与核酸结合。锁核酸分子信标技术,结合了分子信标无需分离未结合探针而直接检测的优势和锁核酸亲合力强、热稳定性好、抗酶切以及体内无毒等特点,在核酸检测方面具有灵敏度高、特异性好的独特优势,近年来得到广泛关注。本文介绍了锁核酸修饰分子信标的结构、功能、设计要点,及其研究现状和一些重要进展,并讨论了目前锁核酸分子信标在分子识别及生物分析中的应用及存在的问题和发展前景。     

Elastic Low-Energy Electron Collisions with Methanethiol

We report ab initio scattering calculations results of electron-methanethiol collisions using R-matrix approach within the static-exchange and static-exchange-polarization approximations. The calculated elastic integral cross sections are in agreement with the experimental data. Two shape resonances of ²A' symmetry located at 4.06 and 8.32 eV are detected within static-exchange-polarization model. For this dipole molecule, Born-closure procedure was used to account for the higher partial waves (l>4) for the convergence of the cross section. The effective collision frequencies over a wide electron temperature range (200?30000 K) are calculated using the data of the momentum-transfer cross section.     

The Role of Taurine in Mitochondria Health: More Than Just an Antioxidant

Taurine is a naturally occurring sulfur-containing amino acid that is found abundantly in excitatory tissues, such as the heart, brain, retina and skeletal muscles. Taurine was first isolated in the 1800s, but not much was known about this molecule until the 1990s. In 1985, taurine was first approved as the treatment among heart failure patients in Japan. Accumulating studies have shown that taurine supplementation also protects against pathologies associated with mitochondrial defects, such as aging, mitochondrial diseases, metabolic syndrome, cancer, cardiovascular diseases and neurological disorders. In this review, we will provide a general overview on the mitochondria biology and the consequence of mitochondrial defects in pathologies. Then, we will discuss the antioxidant action of taurine, particularly in relation to the maintenance of mitochondria function. We will also describe several reported studies on the current use of taurine supplementation in several mitochondria-associated pathologies in humans.     

端面抽运Tm，Ho：YLF激光器双稳特性的理论分析与实验研究

报道了波长为792nm激光二极管端面抽运Tm,Ho：YLF连续激光器的双稳输出特性.在考虑能量传递上转换和基态对2μm激光重吸收的前提下,建立了Tm,Ho：YLF双稳激光器准三能级速率方程理论模型.通过对Tm,Ho：YLF激光器速率方程的求解,理论预见了Tm,Ho：YLF激光器双稳输出的特性,并分析了其产生的机理.进行了激光二极管端面抽运Tm,Ho：YLF激光器双稳输出的实验研究,当激光晶体温度为253K时,双稳区的宽度可达1.6W,跃变点输出功率的跃变量可达82.5mW.通过对比发现理论结果与实验结果比 关键词： 端面抽运 Tm Ho：YLF晶体 连续输出 光学双稳     

Pigment identification and decoration analysis of a 5th century Chinese lacquer painting screen: a micro‐Raman and FTIR study

To investigate the pigments and decoration applied to a wood‐based lacquer painting screen from the tomb of Si‐ma Jin‐long, Shanxi Province, central China, made by Chinese craftsmen in the 5th century, a combination of micro‐Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), wavelength dispersive X‐ray fluorescence (WDXRF), and microscopic examination was used. The obtained results are as follows: (1) the black, yellow, and red colors are identified as carbon black, orpiment and realgar, and cinnabar, respectively, by using micro‐Raman spectroscopy. The FTIR result shows that the white pigment filled in the leaves is not lead white, as assumed in the literature, but gypsum. Whether lead white was used at other locations remains unanswered and requires more samples for further work; (2) the thickness of each discernable pigment layer, as observed under the microscope, is approximately equal and the differences among them are small, suggesting a superfine painting skill; besides, a noticeable smooth interface between wood and the red grounding substance indicates that a polishing process might have been applied before the painting; (3) the red background was proved to contain cinnabar, but further FTIR analyses found no evidence for the presence of Chinese wood oil; and (4) the most interesting finding, rarely reported before, is that white grains of different sizes are found in both pigment layers and the grounding substance, which are perhaps an intentional addition. Further, in situ XRF and Raman analyses indicate that they are sourced from hydroxyapatite, coming probably from the intentional addition of animal bone ash to the lacquer. But how such a process could be finished and what purpose it served have not yet been answered. Copyright © 2009 John Wiley & Sons, Ltd.