Banana is an important tropical fruit and China is the world's third largest banana producer. The standardization level of banana industry not only affects the yield and quality of banana,but also plays an importa...Banana is an important tropical fruit and China is the world's third largest banana producer. The standardization level of banana industry not only affects the yield and quality of banana,but also plays an important role in promoting the production standardization and industrialization of other tropical crops. Through the analysis of revision,publicity and implementation of banana standard system in China as well as the study on its standard system and quality and safety standards,it is found that there are some problems such as irrational banana standard structure,short period of validity of standard,low level of quality and safety standards,and loose link between standards and production. At the same time,some recommendations are put forward in order to guide the standardized production and trade,research and management of banana and promote sustained,healthy and stable development of the banana industry in China.展开更多
Multiform fractures have a direct impact on the mechanical performance of rock masses.To accurately identify multiform fractures,the distribution patterns of grayscale and the differential features of fractures in the...Multiform fractures have a direct impact on the mechanical performance of rock masses.To accurately identify multiform fractures,the distribution patterns of grayscale and the differential features of fractures in their neighborhoods are summarized.Based on this,a multiscale processing algorithm is proposed.The multiscale process is as follows.On the neighborhood of pixels,a grayscale continuous function is constructed using bilinear interpolation,the smoothing of the grayscale function is realized by Gaussian local filtering,and the grayscale gradient and Hessian matrix are calculated with high accuracy.On small-scale blocks,the pixels are classified by adaptively setting the grayscale threshold to identify potential line segments and mini-fillings.On the global image,potential line segments and mini-fillings are spliced together by progressing the block frontier layer-by-layer to identify and mark multiform fractures.The accuracy of identifying multiform fractures is improved by constructing a grayscale continuous function and adaptively setting the grayscale thresholds on small-scale blocks.And the layer-by-layer splicing algorithm is performed only on the domain of the 2-layer small-scale blocks,reducing the complexity.By using rock mass images with different fracture types as examples,the identification results show that the proposed algorithm can accurately identify the multiform fractures,which lays the foundation for calculating the mechanical parameters of rock masses.展开更多
基金Supported by Agricultural Industry Standard Formulation and Revision(Agricultural Product Quality and Safety Supervision)in 2014(201461397)
文摘Banana is an important tropical fruit and China is the world's third largest banana producer. The standardization level of banana industry not only affects the yield and quality of banana,but also plays an important role in promoting the production standardization and industrialization of other tropical crops. Through the analysis of revision,publicity and implementation of banana standard system in China as well as the study on its standard system and quality and safety standards,it is found that there are some problems such as irrational banana standard structure,short period of validity of standard,low level of quality and safety standards,and loose link between standards and production. At the same time,some recommendations are put forward in order to guide the standardized production and trade,research and management of banana and promote sustained,healthy and stable development of the banana industry in China.
基金supported by National Natural Science Foundation of China(Grant No.51739007)National Key Research and Development Program of China(Grant No.2016YFB1100602).
文摘Multiform fractures have a direct impact on the mechanical performance of rock masses.To accurately identify multiform fractures,the distribution patterns of grayscale and the differential features of fractures in their neighborhoods are summarized.Based on this,a multiscale processing algorithm is proposed.The multiscale process is as follows.On the neighborhood of pixels,a grayscale continuous function is constructed using bilinear interpolation,the smoothing of the grayscale function is realized by Gaussian local filtering,and the grayscale gradient and Hessian matrix are calculated with high accuracy.On small-scale blocks,the pixels are classified by adaptively setting the grayscale threshold to identify potential line segments and mini-fillings.On the global image,potential line segments and mini-fillings are spliced together by progressing the block frontier layer-by-layer to identify and mark multiform fractures.The accuracy of identifying multiform fractures is improved by constructing a grayscale continuous function and adaptively setting the grayscale thresholds on small-scale blocks.And the layer-by-layer splicing algorithm is performed only on the domain of the 2-layer small-scale blocks,reducing the complexity.By using rock mass images with different fracture types as examples,the identification results show that the proposed algorithm can accurately identify the multiform fractures,which lays the foundation for calculating the mechanical parameters of rock masses.
