Application of model predictive control strategy based on fuzzy identification to an SP-100 space reactor

In this work, a model predictive control method combined with fuzzy identification, is applied to the design of the thermoelectric (TE) power control in the SP-100 space reactor. The future TE power is predicted by using the fuzzy model identified by a subtractive clustering method of a fast and robust algorithm. The objectives of the proposed fuzzy model predictive controller are to minimize both the difference between the predicted TE power and the desired power, and the variation of control drum angle that adjusts the control reactivity. Also, the objectives are subject to maximum and minimum control drum angle and maximum drum angle variation speed. The genetic algorithm that is effective in accomplishing multiple objectives is used to optimize the fuzzy model predictive controller. A lumped parameter simulation model of the SP-100 nuclear space reactor is used to verify the proposed controller. The results of numerical simulations to check the performance of the proposed controller show that the TE generator power level controlled by the proposed controller could track the target power level effectively, satisfying all control constraints.     

New concept of surface modification to LiCoO2

As the continuance of our series study on LiCoO₂ surface modification, the complicated traditional surface coating method is replaced with simple addition of amorphous YPO₄ and Al₂O₃ in commercial LiCoO₂ or in commercial electrolyte based on our understanding to the improvement mechanism of surface modification. Comprehensive studies by X-ray photoelectron spectroscopy (XPS), gas chromatography and mass spectroscopy (GC–MS), inductively coupled plasma (ICP) and Fourier transformed infrared (FTIR) indicate that the products of spontaneous reaction between the additive and the LiPF₆ based electrolyte are responsible for the performance improvements.     

YAG：Ce Phosphors for WLED via Nano-Pesudoboehmite Sol-Gel Route

The sub-micron sized YAG ： Ce phosphors were synthesized via a modified sol-gel method by peptizing nano-pesudoboehmite particulate. It is found that YAG phase from the dried gel powders appears at 1000 ℃ then the pure YAG phase exists at a relatively lower sintering temperature of 1400 ℃. The smaller sizes of phosphors in the ranges of 1 - 3 μm are obtained due to the contribution of seeding effects of nano-sized alumina particles to strengthen each step of the processes. Both the excitation and emission spectra of photoluminescence of the phosphor obtained at 1400 ℃ meet well with the spectroscopic requirements of the WLED phosphors.     

Thermo-acoustic instability in the horizontal Rijke tube

The instability curve of a Rijke tube system was obtained accurately by following different paths of heat power and flow-rate for three regions and by defining its locus from the criterion based on the measured sound pressure levels. The unstable limits in the region of flow-rate lower than that at the minimal power are compared with previous data. To observe the effect of turbulence on the unstable limits, inflow turbulence was introduced by placing a bundle of circular cylinders upstream of the heating part (50< Re_d< 700). The large-amplitude inflow fluctuation may delay the transition of the chamber acoustic mode to the unstable zone even at a sufficient power.     

6to4与ISATAP技术相结合的IPv6网络实现

在IPv4向IPv6过渡期间,多种过渡技术可以互相支持、互相组合使用,以达到互利互助。简要介绍了其中2种隧道技术:6to4技术和ISATAP技术,提出了1种基于两者结合的新型实验网络的实现方案。具体讨论了在Linux下如何组建这种新型实验网络平台,详细阐明了如何配置IPv6主机以及双栈路由器,为IPv4过渡到IPv6提供1个可行的方案。     

陕北姬塬油区储集层特征地球物理测井分析

为了保持油井稳产，提高油藏采收率，姬塬油区拟采用面积法注水，急需对油藏分布规律进行详实、系统的研究，以保证井网建设的合理、高效。在前人研究成果基础上，对油区现有测井资料进行收集、整理、再解释，从油藏特征研究出发，对储集层进行测井分析，并使用克里金技术进行了地质建模。使用容积法计算油藏储量，为油区的注水开发提供了油藏资料。     

Deep neural network-based fusion model for emotion recognition using visual data

The Journal of Supercomputing - In this study, we present a fusion model for emotion recognition based on visual data. The proposed model uses video information as its input and generates emotion...     

Centroid Iteration algorithm for image tracking

A simple and elegant tracking algorithm called Centroid Iteration algorithm is proposed. It employs a new Background-Weighted similarity measure which can greatly reduce the influence from the pixels shared by the target template and background on localization. Experiments demonstrated the Background-Weighted measure performs much better than the other similarity measures like Kullback–Leibler divergence, Bhattacharyya coefficient and so on. It has been proved that this measure can compute the similarity value contribution of each pixel in the target candidate, based on which, a new target search method called Centroid Iteration is constructed. The convergence of the method has been demonstrated. Theory analysis and visual experiments both validated the new algorithm.     

一类基于元胞自动机的传染病模型的仿真

研究传染病优化控制建模,为了解决早期监测预警体系,考虑到传染病不能统一处理的各种影响因素,针对未能很好的体现疾病传播过程中人的行为特征的影响,从病毒在群体内传播行为的多样性特点出发,借助于网络病毒生长过程及拓扑结构,提出构造新的元胞自动机模型,对病毒在人群接触网络内的传播过程进行了仿真,并在此基础上研究了疫苗注射比率、病毒变异频率、个体反应时间对病毒传播的影响,同时针对病毒的传播特点提出了有效的防治策略.以甲型HIN1为实例,实验结果表明,元胞自动机模型能较好地仿真病毒的传播过程,在疾病预防和控制方面有较高的应用价值.     

谈色彩在平面设计中的应用

色彩、图像、文字是构成平面设计的三大要素,这三大要素在平面设计中起着不同的重要作用,而色彩这一要素在平面设计中的作用尤为重要,它作为把握人的视觉第一关键所在,色彩对人最有吸引力,具有先声夺人的艺术魅力。本文主要阐述了色彩的视觉心理和平面设计中色彩的运用原则。