采用区域生长和EMDs模型的运动目标检测方法

以动态背景中红外运动目标为研究对象,针对二维初级运动检测器在时域上对运动敏感而引起目标运动矢量受背景变化干扰的问题,提出一种结合时域中生物视觉二维初级运动检测器和空域中区域生长方法的运动检测方法。该方法利用时域中二维初级运动检测器检测出运动矢量并将幅值最大的运动矢量作为区域生长的种子点,利用空域中运动目标具有较高红外辐射的图像特性,通过区域生长法,将热辐射特性强于背景的目标分割出来。仿真实验结果表明:该方法在去除背景干扰的同时提取出动态背景中的运动目标,与其他方法相比具有较高的信杂比。     

Quadratic Bent and Semi-bent Functions over Finite Fields of Odd Characteristic

Let n = me and p be an odd prime. Let Fp be a finite field and Fpn be its nth field extension. By some polynomial GCD computatlons, this paper characterize the hentness and semi-bentness of two classes of p-ary quadratic functions from Fp^n to Fp with coefficients in Fpe. Moreover, the enumeration formulas of constructed bent functions are obtained for some special cases of m. The results generalize some previous related work.     

基于大数据的配电设备运行状态监控与故障预警系统设计

以大数据为基础,从数据采集层、集成计算层、数据分析层以及应用层4个方面设计与研究配电设备运行状态监控与故障预警系统,在实时流处理技术与自行编写业务模块的支持下,该系统能够执行数据挖掘分析、预警通知与可视化处理等任务,并实现对配电设备相关数据的采集监控、预警分析、故障闭环管理以及辅助决策等功能,有效地弥补传统配电设备运行与维护管控方式中存在的不足。     

蜂王浆中水溶性蛋白质和活性肽的研究进展

蜂王浆中的蛋白质和肽对蜂王浆的生理活性有重要影响。综述了近年来蜂王浆水溶性蛋白和活性肽的分离纯化、蛋白质结构，以及功能特性等方面的研究状况。     

State recovery attack on ACORN v3 in nonce-reuse setting

Based on differential-algebraic method and guess-and-determine technique,the state recovery attack of ACORN v3 was presented when one pair of key and Nonce was used to encrypt two messages.The time complexity of the attack was 2^122.5c,where c was the time complexity of solving linear equations.The data complexity and the storage complexity were negligible.Furthermore,according to the analysis on the sense of multiple nonce reuse,it is found that relatively complicated filter function of ACORN v3 makes it infeasible to extract the linear equations about the internal state directly from key streams.Thus,the risk of significantly reducing the attack complexity by increasing the times of nonce reuse can be effectively avoided.     

Cross-domain access control policy mapping mechanism for balancing interoperability and autonomy

Cross-domain access control can improves interoperability but reduces intra-domain autonomy.To balance inter-domain interoperability and intra-domain autonomy,a cross-domain access control policy mapping to the problem of multi-objective integer optimization programming was formulated.Both the maximization of inter-domain interoperability and the minimization of intra-domain autonomy were taken as the objectives.Further,seven constraints were designed to prevent typical cross-domain conflicts.To solve the optimization problem,a constrained NSGA-III algorithm was proposed.The experimental results show that the proposed algorithm can quickly converge and accurately find the policy mapping even in the large-scale datasets.     

Limitations and improvement of the potential utilisation of woody biomass for energy derived from short rotation woody crops in Sweden and Germany

The use of biomass derived from fast-growing trees grown on agricultural land is common practice in parts of Sweden, but not in most other European countries. In the first part of this paper the different conditions for economic use of fast growing trees are analysed in Germany and Sweden. Neither the legal framework nor the natural growing conditions are likely to limit the utilisation of the biomass potential in Germany. Rather, lack of a market for biomass products, poor awareness and little infrastructure for the management of woody biomass plantations are limitations in Germany. The second part offers a possible solution for supporting the market and reducing transaction costs during establishment of the market under German conditions. The proposed solution involves the establishment of ‘ecological structures’ based on fast-growing trees as a means to compensate for sealed land by roads and buildings. The proposed concept would not only extend the economic potential for producing energy from biomass, but also allow farmers to generate income. The concept can serve both economic and ecological goals. It can reduce municipal budget funding and support the agricultural industry in European countries which need to implement sustainable biomass concepts.     

Antioxidant activity of propolis of various geographic origins

Propolis is a resinous substance collected by honeybees from various plant sources. The antioxidant activities of propolis of various geographic origins, i.e., Argentina, Australia, Brazil, Bulgaria, Chile, China (Hebei, Hubei, and Zhejiang), Hungary, New Zealand, South Africa, Thailand, Ukraine, Uruguay, United States, and Uzbekistan were compared. Ethanol extracts of propolis (EEP) were prepared and evaluated for antioxidant activities of EEP samples by the β-carotene bleaching and 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging assay systems. Major constituents were identified in EEP by HPLC analysis with photo-diode array (PDA) and mass spectrometric (MS) detection, and quantitatively analyzed. EEP from Argentina, Australia, China, Hungary and New Zealand had relatively strong antioxidant activities, and were also correlated with the total polyphenol and flavonoid contents. Propolis with strong antioxidant activity contained antioxidative compounds such as kaempferol and phenethyl caffeate.     

Volatile compounds evolution of three table grapes with different flavour during and after maturation

Volatile compounds of three different flavour table-grapes, ‘Jingxiu’, ‘Bimeijia’ and ‘Jingya’, were investigated during and after maturation using SPME/GC–MS. All the alcohols and carbonyls, along with most of the C₆ compounds and terpenoids, were evident before veraison, while most of the esters were detected at or after veraison. C₆ compounds increased in the early period of maturation, and then decreased. Most alcohols and carbonyls tended to continuously decrease during ripening. Except for geraniol, terpenoids increased until maturation, then decreased. Some esters continued to increase after maturation. Principal component analysis showed that terpenoids and esters were the characteristic volatiles of ripe ‘Bimeijia’ and ‘Jingya’ grapes, respectively. ‘Bimeijia’ had the highest terpenoid content at maturity, while ‘Jingya’ continued to accumulate some esters after maturation. To achieve berries of full-bodied aroma, ‘Bimeijia’ should be harvested at maturity and ‘Jingya’ should have a delayed harvest. For the neutral grape ‘Jingxiu’, delayed harvest is recommended to reduce the ‘green’ odour.