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Yang X.,Northeast Forestry University | Luo J.,Northeast Forestry University | Luo J.,Harbin Research Institute of Forestry Machinery
World Automation Congress Proceedings | Year: 2012

The testing experiments to healthy poplar and larch logs samplings were conducted by using Arbotom stress wave testing instrument and universal mechanics testing machine. The relationships between dynamic modulus of elasticity of stress wave E1, E2, E3 and bending properties were studied in the two logs samplings. The results indicated that, in the poplar and larch logs samplings, the dynamic modulus of elasticity of stress wave E1, E2, E3 all had certain linear correlation with bending strength and modulus of elasticity in bending. © 2012 TSI Press. Source


Zhang W.,Northeast Forestry University | Wei R.,Northeast Forestry University | Wei R.,Harbin Research Institute of Forestry Machinery | Chen S.,Northeast Forestry University | And 8 more authors.
Physiologia Plantarum | Year: 2015

We cloned a Cinnamoyl-CoA Reductase gene (BpCCR1) from an apical meristem and first internode of Betula platyphylla and characterized its functions in lignin biosynthesis, wood formation and tree growth through transgenic approaches. We generated overexpression and suppression transgenic lines and analyzed them in comparison with the wild-type in terms of lignin content, anatomical characteristics, height and biomass. We found that BpCCR1 overexpression could increase lignin content up to 14.6%, and its underexpression decreased lignin content by 6.3%. Surprisingly, modification of BpCCR1 expression led to conspicuous changes in wood characteristics, including xylem vessel number and arrangement, and secondary wall thickness. The growth of transgenic trees in terms of height was also significantly influenced by the modification of BpCCR1 genes. We discuss the functions of BpCCR1 in the context of a phylogenetic tree built with CCR genes from multiple species. © 2014 Scandinavian Plant Physiology Society. Source


Yang X.,Northeast Forestry University | Luo J.,Harbin Research Institute of Forestry Machinery
Proceedings 2011 International Conference on Transportation, Mechanical, and Electrical Engineering, TMEE 2011 | Year: 2011

The testing experiments to healthy poplar and larch logs samplings were conducted by using Arbotom stress wave testing instrument and universal mechanics testing machine. The relationships between dynamic modulus of elasticity of stress wave E 1, E 2, E 3 and compression properties were studied in the two logs samplings. The results indicated that, in the poplar and larch logs samplings, the dynamic modulus of elasticity of stress wave E 1, E 2, E 3 all had certain linear correlation with compression strength and modulus of elasticity in compression. © 2011 IEEE. Source


Juying L.,Harbin Research Institute of Forestry Machinery | Quangang L.,Harbin Research Institute of Forestry Machinery | Xiaofeng W.,Harbin Research Institute of Forestry Machinery | Kesheng X.,Harbin Research Institute of Forestry Machinery | And 3 more authors.
Applied Mechanics and Materials | Year: 2013

This paper described the importance of industrialized grow seedlings. In order to realize the modern factory forestry development request, precision seeder is the very key part of mechanized seedling production line. Based on the related work requirements of seedling production line, we have designed pneumatic system of precision seeder, analyzed the principle and selected suitable components of pneumatic device. This paper provides a theory basis for the further research. © (2013) Trans Tech Publications, Switzerland. Source


Zhang J.-L.,Harbin Research Institute of Forestry Machinery | Bi W.,Harbin Research Institute of Forestry Machinery | Wang X.-H.,Harbin Research Institute of Forestry Machinery | Wang Z.-B.,Harbin Research Institute of Forestry Machinery | Li D.-F.,Harbin Research Institute of Forestry Machinery
Chinese Journal of Applied Ecology | Year: 2013

Lightning-caused fire is the most important natural fire source. Its induced forest fire brings enormous losses to human beings and ecological environment. Many countries have paid great attention to the prediction of lightning-caused fire. From the viewpoint of the main factors affecting the formation of lightning-caused fire, this paper emphatically analyzed the effects and action mechanisms of cloud-to-ground lightning, fuel, meteorology, and terrain on the formation and development process of lightning-caused fire, and, on the basis of this, summarized and reviewed the logistic model, K-function, and other mathematical methods widely used in prediction research of lightning-caused fire. The prediction methods and processes of lightning-caused fire in America and Canada were also introduced. The insufficiencies and their possible solutions for the present researches as well as the directions of further studies were proposed, aimed to provide necessary theoretical basis and literature reference for the prediction of lightning-caused fire in China. Source

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