A geometric correction based robust color image watermarking scheme using quaternion Exponent moments

Most of the existing color image watermarking schemes was designed to mark grayscale images or use the color components, which ignore the significant correlation between different color channels. Recently, several approaches were developed to process the color channels intrinsically, but they always cannot counterattack geometric distortions. It is a challenging work to design a robust color image watermarking scheme against geometrical distortions. In this paper, we propose a geometric correction based robust color image watermarking approach using quaternion Exponent moments (QEMs). The novelty of our approach is that (1) the QEMs are derived to deal with the color images in a holistic manner, and (2) the QEMs are exploited for estimating the geometric distortions parameters in order to permit watermark extraction. Experimental results confirm the validity of our approach and its higher robustness against geometrical distortions compared to alternative watermarking methods in the literature.     

V2O5 nanobelt-carbonized bacterial cellulose composite with enhanced electrochemical performance for aqueous supercapacitors

Journal of Solid State Electrochemistry - V2O5 nanobelt-carbonized bacterial cellulose (V2O5-CBC) nanocomposite was synthesized via a hydrothermal process in a single step. The prepared samples...     

Mapping some basic functions and operations to multilayer feedforward neural networks for modeling nonlinear dynamical systems and beyond

Nonlinear Dynamics - This study significantly extends the development of an initialization methodology for designing multilayer feedforward neural networks, aimed primarily at modeling nonlinear...     

软件可靠性中NHPP模型趋势检验的U-图方法

对软件可靠性中一类重要的模型——非齐次泊松过程（ＮＨＰＰ）模型的趋势检验，构造了一列检验的统计量，独立同分布于均匀分布Ｕ（０，１）．并由柯尔莫哥洛夫检验判定所选择的可靠性增长趋势模型的合适性．本文方法可适用于完全数据和不完全数据．这里报告的方法，可以作为选择软件可靠性模型时的一种判断依据，以定量地评判选择的软件可靠性模型的优劣．     

Synthesis and cytotoxic activity of heterocycle-substituted phthalimide derivatives

<正>A series of heterocycle-substituted phthalimide derivatives were synthesized.Structurally diverse derivatives with heterocyclic rings,including furan,imidazo[1,2-a]pyridine,1,3,4-thiadiazine,imidazo[2,1-b][1,3,4]thiadiazine,pyrazole,1,2,4-triazolo[3,4- b][1,3,4]thiadiazine,thiazole and thiazoline,were obtained by the reactions ofα-bromoketone intermediate with various nucleophiles containing oxygen,nitrogen and sulfur atom.Their cytotoxic activity was also evaluated against five human cancer cell lines in vitro.     

Fluorescence imaging mitochondrial copper(Ⅱ) via photocontrollable fluorogenic probe in live cells

Monitoring mitochondrial derived copper(Ⅱ) in live cells is highly demanded, but accurately detecting is unmet due to the interference with cytoplasmic copper(Ⅱ). Herein, we have reported the design,synthesis and characterization of photocontrollable fluorogenic probe, M_(Cu)~(-3), which is equipped with a photo-labile group(nitrobenzyl group) and mitochondria targeting unit(triphenylphosphonium salt).This novel probe showed an intense fluorescence enhancement in response to copper(Ⅱ) without interference from other metal cations in the biological condition(p H 6–9). The detection limit is 1.7 ×10~(-7) mol/L in HEPES buffer. The confocal fluorescence imaging results demonstrated M_(Cu)~(-3) can visualize mitochondrial copper(Ⅱ) in live mammalian cells. The clear advantage of our photocontrollable method is successful to avoid the influence of cytoplasmic copper(Ⅱ) during mitochondria specific detection.     

Cation-π Interactions. Synthesis and Crystal Structure of Palladium Complex: [K(DB18C6)]2[Pd(SCN)4]

A novel Pd(II)-dibenzo-18-crown-6 (DB18C6) complex [K(DB18C6)]2[Pd(SCN)4] has been isolated and characterized by X-ray diffraction analysis. In the solid state, it displays a quasi-one-dimensional infinite chain of two [K(DB18C6)] + complex cations and a [Pd(SCN)4]2- anion bridged by K+-p interactions between adjacent [K(DB18C6)] + units.