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Tan J.,Central South University of forestry and Technology
Applied Mechanics and Materials | Year: 2013

Aiming at the problem that most of weighted association rules mining algorithms have not the anti-monotonicity, this paper presents a weighted support-confidence framework which supports anti-monotonicity. On this basis, weighted boolean association rules mining algorithm and weighted fuzzy association rules mining algorithm are presented, which use pruning strategy of Apriori algorithm so that improve the efficiency of frequent itemsets generated. Experimental results show that both algorithms have good performance. © (2013) Trans Tech Publications, Switzerland. Source


Zhang X.,Central South University of forestry and Technology | Seo H.J.,Pukyong National University
Journal of Alloys and Compounds | Year: 2010

Novel Eu3+-doped NaCa4(BO3)3 phosphors were synthesized by solid-state reactions. The emission spectra exhibit well-known transitions from the 5D0 level to the lower 7F manifold. The excitation spectrum monitored with 613 nm consists of broad excitation band peaking at 265 nm and some narrow lines originated from the typical Eu3+ intra-4f6 transitions. The optimum Eu3+ doped concentration, the critical distance of the concentration quenching, the fluorescence decay curves, and the mechanism of concentration quenching are investigated. © 2010 Elsevier B.V. All rights reserved. Source


Zhang X.,Central South University of forestry and Technology | Seo H.J.,Pukyong National University
Journal of Alloys and Compounds | Year: 2011

Luminescence properties of the Sm3+, Dy3+ doped LaMoBO6 phosphors are reported. LaMoBO6:Sm3+ exhibits orange emission corresponding to the 4G5/2 → 6H7/2 transition. LaMoBO6:Dy3+ exhibits two emission bands. The yellow band (570 nm) corresponds to the 4F9/2 → 6H13/2 transition, and the blue one (482 nm) corresponds to the 4F9/2 → 6H15/2 transition. The optimum concentration of Sm 3+ and Dy3+, the critical distance of the concentration quenching, and the decay curves have also been investigated. The analysis of the decay curves indicates that cross-relaxation is primarily responsible for the concentration quenching. © 2010 Elsevier B.V. All rights reserved. Source


Jiang X.,Central South University of forestry and Technology | Sommer S.G.,University of Southern Denmark | Christensen K.V.,University of Southern Denmark
Energy Policy | Year: 2011

This article presents an overview of the development and future perspectives of the Chinese biogas industry. The development of the industry has the potential to improve the rural environment and produce significant amounts of sustainable energy for China. Barriers to the development are the relatively weak environmental policies, imperfect financial policies and lack of long-term follow-up services. The rapid economic development of China has also seen a development in the scales of biogas plants constructed. Although the technology has been improved, this review has identified problems in the construction and operation of Chinese biogas plants, particularly in the efficiency of household systems. All levels of China's government acknowledge this and recent biogas projects have more focus on quality and less on the quantity. The intention is to gradually introduce stricter environmental policies, to provide better service systems, improve the financial policies that support the construction and follow-up service of biogas projects, promote the use of standardized engineering equipment and materials and standards for plant construction and production. This will promote the development of biogas projects at various scales further, and reduce the dependency on fossil fuels and emissions of greenhouse gases. © 2011 Elsevier Ltd. Source


Ling K.,Central South University of forestry and Technology
International Journal of Digital Content Technology and its Applications | Year: 2011

The forest fire precautionary warning system is composed of wired and wireless communications. Its hardware and software adopt modular structure, so as to compose the system flexibly and adapt to forest fire precautionary warning system of different sizes, different circumstances and different requirements. Any part extracted from the whole system can constitute a complete system. In short, users can select the most rational allocation of software and hardware resources according to the actual situation in order to achieve a higher performance price ratio, which is extremely important for industrialization. Source

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