SVD based scale transform invariant observable degree for LTI system

Dear editor, The basic concept of observability is used to express the possibility to recover the state from measurements in modern control theory [1-3].It is a...     

Simulation annealing diagnosis algorithm method for optimized forecast of the dynamic response of floating offshore wind turbines

Design of floating offshore wind turbines(FOWTs)needs reliable and innovative technologies to overcome the challenges on how to better predict the dynamic respo...     

Biological analysis of woodpecker’s brain after impact experiments

Woodpeckers can withstand a fierce impact during pecking. Previous studies have focused on the biomechanical analysis of the pecking process, the properties of the beak and hyoid bone of woodpecker; however, the biological characteristics of the woodpecker brain are also important in resisting impact injuries. We employed impact experiments and biological analysis in normal and injured brains to reveal the impact-resistant biological characteristics of woodpecker brains, as well as the impact energy's biological effects on the woodpecker brain. The hoopoe, which has a similar size but only a slight pecking behavior, was selected as the control group to compare brain morphology and neuronal cells differences in normal brains between woodpecker and hoopoe by sectioning and staining. A loading device was designed to conduct a quantifiable impact energy to the woodpeckers' head. Four groups of woodpeckers were impacted with the same energy on the forehead, beak, tempus and occiput,respectively. Biological changes in the injured brains were evaluated by Nissl staining and enzyme-linked immunosorbent assay.The results showed that:(1) woodpeckers had a larger cerebellum and a higher density of Nissl bodies than hoopoe;(2) Nissl apoptosis appeared in the brain samples after the forehead and the occiput impact experiments, but no obvious Nissl body apoptosis was observed after impact on the tempus and the beak;(3) β-amyloid protein accumulated in the normal status woodpecker brain. This study reveals that: woodpecker brain morphology is well-adapted to impact, woodpecker heads display location-dependent protective performance, with beak and tempus regions having a better protective performance than the forehead and occiput, Nissl apoptosis appears in injured woodpecker brains, and that the accumulation of β-amyloid protein does not show a direct relationship with the injury state of woodpecker's brain tissue in our study.     

Robust minimum class variance twin support vector machine classifier

The recently proposed twin support vector machine (TWSVM) obtains much faster training speed and comparable performance than classical support vector machine. However, it only considers the empirical risk minimization principle, which leads to poor generalization for real-world applications. In this paper, we formulate a robust minimum class variance twin support vector machine (RMCV-TWSVM). RMCV-TWSVM effectively overcomes the shortcoming in TWSVM by introducing a pair of uncertain class variance matrices in its objective functions. As a special case, we present a special type of the uncertain class variance matrices by combining the empirical positive and negative class variance matrices. Computational results on several synthetic as well as benchmark datasets indicate the significant advantages of proposed classifier in both computational time and test accuracy.     

实时股市行情播出系统改版及实施方案

应用多媒体资讯电视（CBNC—INFOTV）制播系统,将原有的实时股市行情播出系统进行改版,改版后的播出系统在同一播出屏幕上划分区域更合理,内容更丰富,目的是将单位时间内所创造的广告价值最大化,并通过系统流程图、连线图等方式列举了搭建播出平台的实施方案。     

High-pseudocapacitance of porous and square NiO@NC nanosheets for high-performance lithium-ion batteries

Layered nickel oxides have been focused with intense research interests as high-performance lithium-ion batterie(LIB) anode.However,it is hard to obtain few layered nickel oxides material directly as it easily forms bulk material with the strong interaction between the interlayer.In this work,two-dimensional(2 D) nickel-based coordination polymers were successfully prepared according to aqueous phase copolymerization approach.And then uniform carbondoped NiO nanosheets were successfully obtained from facile solution assembly and post-thermal treatment.The detailed electrochemical testing shows that the uniform NiO nanocrystals encapsulated into porous N-doped carbon(NiO@NC) nanosheets present much higher rate capability with the discharge specific capacity of 782.7 mAh·g~(-1) at high current density of 2.0 A·g~(-1) than pure NiO(690 mAh·g~(-1)).It also shows long-term cycling performance with 91 % retention after 50 cycles at 1.0 A·g~(-1).The high rate capability,cycling stability and the easy synthesis make NiO@NC nanosheets as a promising candidate for LIB anode and build up new way for the fabrication of metal oxides anode materials.     

水压图教学实验台的研制及实验分析

介绍了水压图教学实验台的构成,通过调节阀门进行了不同水力工况下同程式和异程式管网的水压图实验。     

白藜芦醇糖苷类衍生物的设计与合成

以白藜芦醇及其类似物紫檀芪为原料,采用Schmidt成苷法、相转移催化法,分别与溴代糖和乙酰氨基糖反应,得紫檀芪乙酰葡萄糖苷和(E)-5,4'-二叔丁基二甲基硅基-3-(2"-乙酰氨基-3",4",6"-三乙酰葡萄糖二苯乙烯,其结构经红外光谱、核磁共振氢谱和质谱表征.     

Multi-user security of the tweakable Even-Mansour cipher

Dear editor, Data security, including data privacy security and data integrity security, are usually achieved by a cryptographic algorithm.Block ciphers axe wid...     

cPCN-Regulated SnO2 Composites Enables Perovskite Solar Cell with Efficiency Beyond 23％

Efficient electron transport layers(ETLs)not only play a crucial role in promoting carrier separation and electron extraction in perovskite solar cells(PSCs)but...