Study of collective user behaviour in Twitter: a fuzzy approach

The study of collective user behaviours in social networking sites has become an increasing important topic in social media mining. Understanding such behaviours has its potential to extract actionable patterns that can be beneficial to develop effective marketing strategies, optimise user experiences and maximise website revenues. With the rapid development of micro-blogging, Twitter has become a richer source of intelligence that can be used to study collective user behaviour, due to its efficient and meaningful user-to-user interactions. However, the classical statistical methods have some drawbacks in bridging the gap between user-generated data and human analysts who mostly use linguistic terms to analyse data and model/summarise knowledge learned. To address this gap, this work proposes a new approach, which employs the mass assignment theory-based fuzzy association rules algorithm (MASS-FARM), for the first time, to extract useful interaction behaviour of Twitter users. The influential factors (including activity time, number of friends/followers and the number of tweets) are represented as fuzzy granules, and the associations amongst are studied by employing MASS-FARM. The collective user behaviours are analysed in the Reply category and the Non-Reply category, respectively. The applicability and usefulness of the proposed method are demonstrated via an empirical study on a collected Twitter data set. The derived results are also discussed and compared with existing works.     

Dynamic watermarking scheme for quantum images based on Hadamard transform

In this paper, a novel watermarking scheme for quantum images based on Hadamard transform is proposed. In the new scheme, a unitary transform controlled by a classical binary key is implemented on quantum image. Then, we utilize a dynamic vector, instead of a fixed parameter as in other previous schemes, to control the embedding process. The dynamic embedding vector is decided by both the carrier quantum image and the watermark image, which is only known by the authorized owner. The proposed scheme is analyzed from visual quality, computational complexity, and payload capacity. Analysis and results show that the proposed scheme has better visual quality under a higher embedding capacity and lower complexity compared with other schemes proposed recently.     

Na2S-SO2反应体系中H2S产生的过饱和态分析

向Na2S溶液中通入低浓度SO2气体以生成H2S，H2S从液相中逸出时，存在一突跃现象。本文根据这一现象，结合Y．T．Shah等提出的吸收－反应－解吸体系中过饱和态存在的条件，通过理论分析，得出在Na2S-SO2-H2S4反应体系中H2S解吸存在过饱和现象。     

粉体高浓度输送相图

根据以固体质量流速和固体装入量为参数的Zenz相图（即压降与表观气速的关系图）和洪江等人的模型[6]，对粗聚氯乙烯和细PVC颗粒的水平气力输送进行了合理的预测     

反应型共聚物相容剂在聚合物合金中的应用

反应型共聚物相容剂所含的反应官能团与共混物中聚合物的相关的官能团发生化学反应，从而改善不相容聚合物共混物的相容性。本文介绍了反应型共聚物相容剂的分子设计，合成及其应用。     

The preparation of coupled WO3/TiO2 photocatalyst by ball milling

The coupled photocatalyst WO₃/TiO₂ is prepared by ball milling by doping WO₃ into TiO₂ and using H₂O solution as disperser. The coupled photocatalyst WO₃/TiO₂ is characterized by UV–VIS diffuse reflection spectrum, X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD) and Transmission electron microscopy (TEM). The results show that the optimum percentage of WO₃ doped is 3% and that the photocatalytic activity of the coupled WO₃/TiO₂ photocatalyst is much higher than that of TiO₂ and WO₃–TiO₂ with no ball milling. Compared with TiO₂, the photoexcited wavelength range of the WO₃/TiO₂ photocatalyst red-shifts about 50 nm, and the light absorption intensity is also improved. The crystal phase of TiO₂ is not changed and new crystal phases are not found during the process of ball milling. WO₃ and TiO₂ coupled highly, forming the WO₃/TiO₂ photocatalyst. The increased photocatalytic activity of the coupled photocatalyst may be attributed to the enhance charge separation efficiency and the extend wavelength range of photoexcitation.     

量子图像处理问题综述

量子图像处理问题将是量子计算机时代媒体信息处理的一个主要问题。量子图像处理包括一般的处理问题和安全方面的处理问题。本文介绍和分析了量子图像表示方式和处理等问题的最新研究成果。首先给出了目前量子图像处理的一般架构,然后介绍了目前流行的量子图像表示方法、并根据不同的量子图像处理目的对现有的处理算法进行了分类和分析,最后总结并展望了量子图像处理领域的未来发展方向。     

Pyrolysis of peat: Product yield and characterization

Pyrolysis of peat obtained from Yeniça?a, Bolu, Turkey was conducted in a fixed-bed tube furnace under various conditions, and variations in the structure of the char, tar and gas products were examined. The chars produced were studied by proximate and ultimate analyses. The maximum tar yield of 20.41% was obtained at a heating rate of 20 °C/min, a temperature of 450 °C, a sweeping gas flow rate of 100 ml/min and a 0.5–2.0 mm size range. The chemical composition of the tar was examined by elemental analysis, FTIR spectroscopy, ¹H-NMR spectroscopy and column chromatography. The chemical composition of the tar with dense aliphatic structure was established to be CH_1.22O_0.25N_0.02. The composition of the gases obtained at a heating rate of 20 °C/min for the 0.5–2.0 mm size range was examined by gas chromatography.     

富氧燃烧技术在石灰回转窑中的应用研究及经济性预测

利用燃烧学理论及其相关知识对富氧燃烧技术的特点进行了详细的理论分析.在此基础上针对某公司拟在石灰回转窑中应用该技术的工程案例进行了计算,提出了3种不同的技改方案,并对其经济性进行了预测.结果表明在不改变现有燃烧设备的条件下,采用焦炉煤气和转炉煤气混合富氧的方案,氧体积分数控制在21.4%时最为合理;采用焦炉煤气和高炉煤气混合富氧的方案,氧体积分数控制在23.0%时最为合理;从成本分析前者更具有竞争性.如果对现有燃烧设备进行改造,建议采用转炉煤气和高炉煤气混合富氧的方案,氧体积分数控制为28.0%时,成本节约潜力最大,对该公司最有实用意义,此时对应的煤气流量约为20 km3/h.