Recent Advances in Methods and Techniques for Freshness Quality Determination and Evaluation of Fish and Fish Fillets: A Review

The freshness quality of fish plays an important role in human health and the acceptance of consumers as well as in international fishery trade. Recently, with food safety becoming a critical issue of great concern in the world, determination and evaluation of fish freshness is much more significant in research and development. This review renovates and concentrates recent advances of evaluating methods for fish freshness as affected by preharvest and postharvest factors and highlights the determination methods for fish freshness including sensory evaluation, microbial inspection, chemical measurements of moisture content, volatile compounds, protein changes, lipid oxidation, and adenosine triphosphate (ATP) decomposition (K value), physical measurements, and foreign material contamination detection. Moreover, the advantages and disadvantages of these methods and techniques are compared and discussed and some viewpoints about the current work and future trends are also presented.     

基于改进的小波分解织物疵点检测

采用小波分解的改进方法，运用二维离散小波变换进行分解，有效地从图像中提取信息，分析织物的纹理特征并进行相应处理，实现目标图像的特征提取和输入LMBP神经网络进行学习训练。实验结果表明，对油污、破洞、断经、断纬能比较准确地识别和定位，可快速有效地进行织物疵点检测。     

分析化学样品前处理方法讨论

样品处理是分析化学工作中一个重要的步骤,其处理结果的好坏直接影响分析数据的优劣,文章综述了分析化学样品前处理的重要性、原则及其操作要点,介绍了干灰化法、湿式消解法和微波消解法的适用范围及其优缺点,为分析化学工作者提供参考。     

MPI环境下二维流动的并行计算

在MPI并行环境下,使用Fortran语言自行开发的程序,采用区域分解法对二维流动问题进行了数值模拟计算。最后分析了计算机集群在数值求解复杂流动问题方面的实用性以及实际所能达到的计算效率。     

基于SVD-SURF的宽基线鲁棒景象匹配算法

提出一种基于SVD-SURF的宽基线鲁棒景象匹配算法。首先,在实时图与基准图奇异值分解的基础上构建SURF尺度空间,运用快速Hessian矩阵定位极值点;然后,计算出图像的64维SURF描述子;最后,通过Hessian矩阵迹进行特征点匹配,并利用RANSAC参数估计方法剔除出格点,从而实现位置参数的精确估计。实测航空图像序列位置估计实验表明了该景象匹配算法对图像的旋转、尺度变换及噪声不敏感,具有较强的实时性、精确性和鲁棒性。     

One Step Synthesis of NiO Nanoparticles via Solid-State Thermal Decomposition at Low-Temperature of Novel Aqua(2,9-dimethyl-1,10-phenanthroline)NiCl2 Complex

[NiCl₂(C₁₄H₁₂N₂)(H₂O)] complex has been synthesized from nickel chloride hexahydrate (NiCl₂·6H₂O) and 2,9-dimethyl-1,10-phenanthroline (dmphen) as N,N-bidentate ligand. The synthesized complex was characterized by elemental analysis, infrared (IR) spectroscopy, ultraviolet-visible (UV-vis) spectroscopy and differential thermal/thermogravimetric analysis (TG/DTA). The complex was further confirmed by single crystal X-ray diffraction (XRD) as triclinic with space group P-1. The desired complex, subjected to thermal decomposition at low temperature of 400 ºC in an open atmosphere, revealed a novel and facile synthesis of pure NiO nanoparticles with uniform spherical particle; the structure of the NiO nanoparticles product was elucidated on the basis of Fourier transform infrared (FT-IR), UV-vis spectroscopy, TG/DTA, XRD, scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDXS) and transmission electron microscopy (TEM).     

Mg（OH）2／Al（OH）3对膨胀型防火涂料热分解特性影响的研究

以苯丙乳液为成膜物质,聚磷酸铵、三聚氰胺、季戊四醇为膨胀阻燃体系,分别添加不同量的氢氧化镁、氢氧化铝制备了三种防火涂料。用热重分析仪分别对膨胀阻燃涂料的单组分及涂料的热分解特性进行表征,并用锥形量热仪测试其燃烧性能。实验结果表明,单独用氢氧化镁或氢氧化铝作为添加剂,均会促进涂料的热分解过程,其热释放速率的峰值也会提前。     

螺压推进剂成型工艺过程安全性分析

为提高螺压推进剂成型工艺过程的安全性,从剪切流动、绝热压缩和过热分解等视角,对推进剂在单螺杆压伸成型工艺过程中发生危险的可能性进行论述。系统地分析了药料在螺杆和模具内的流动状态,通过模拟实验,研究了推进剂在压伸过程中的热分解(着火)温度,通过实验数据分析了热分解的原因。结果表明:在药料剪切强度下降的情况下,固体床的断裂将意味着压伸的失败;在排气不畅的情况下,压伸过程的断料有可能形成绝热压缩而引发严重后果。     

图像分解的多尺度变分模型

该文提出了一种新的多尺度变分图像分解模型.首先在Tadmar的分层多尺度变分模型的基础上,给出了一种新的(,)BV H-分层多尺度图像分解方法,然后在逆尺度空间上积分“尺度”图像并将拉普拉斯算子作用于曲1率项就得到了新的积分微分方程.该方程包含一个单调递增的尺度函数,它的值与残差图像的星范数成反比.接着讨论了该方程的重要性质,并给出了数值离散算法.理论分析与数值实验表明新的积分微分方程是一种有效的图像分解模型.     

三小区环境中基于三角分解的低复杂度干扰对齐算法

针对3小区每小区2个边缘用户的MIMO下行链路,在不改变系统自由度的前提下对联合信道进行下三角分解得到系统的等效模型;在此基础上,根据不同小区受到的干扰不同,该文提出一种线性干扰对齐算法同时消除小区间干扰和小区内干扰.该算法利用联合信道分解可以先消除一半的小区间干扰,并根据不同小区的用户设计其干扰抑制矩阵,减少了用户端接收矩阵个数及相应处理,从而降低了接收端的复杂度.仿真表明,随着数据流的增加,系统容量和能量效率都有明显的提高,在自由度相同的情况下,天线数不同对系统容量和能量效率有较大影响.