Concern about the biological hazards involved in microbiological research, especially research involving laboratory animals, has increased in recent years. Working in an animal biosafety level 2 facility （ABSL-2）, c...Concern about the biological hazards involved in microbiological research, especially research involving laboratory animals, has increased in recent years. Working in an animal biosafety level 2 facility （ABSL-2）, commonly used for research on infectious diseases, poses various biological hazards. Here, the regulations and standards related to laboratory biosafety in China are introduced, the potential biological hazards present in ABSL-2 facilities are analyzed, and a series of strategies to control the hazards are presented.展开更多
To model the damage process of masonry walls under blast loading, a dynamic continuum damage material model is constructed for brick and mortar separately. The degradation of both the stiffness and strength are govern...To model the damage process of masonry walls under blast loading, a dynamic continuum damage material model is constructed for brick and mortar separately. The degradation of both the stiffness and strength are governed by a damage variable. By using the proposed material model, damage and fragmentation of a typical masonry wall under blast loading at different scaled distances is calculated. The hazard level of the masonry wall to blast loading is evaluated by analyzing the numerical results.展开更多
The primary aim of this study was to classify the hazard level of brown planthopper(BPH)damage in rice.Three datasets,including spectral reflectance corresponding to the sensitive wavelengths from rice canopy spectral...The primary aim of this study was to classify the hazard level of brown planthopper(BPH)damage in rice.Three datasets,including spectral reflectance corresponding to the sensitive wavelengths from rice canopy spectral wavelengths,rice stem spectral wavelengths,and fusion information of rice canopy and stem spectral wavelengths were used for BPH hazard level classification by using different algorithms.Datasets and algorithms were optimized by the BPH hazard level classification effects(which was evaluated by indices of accuracy,precision,recall,F_(1),and k-value).The optimized algorithm combination was used to build a hazard level classification model for spectral reflectance corresponding to the sensitive wavelength from the rice canopy spectral images.Results showed that:(1)The spectral reflectance corresponding to the sensitive wavelengths of fusion information dataset performed best in BPH hazard level classification,with the highest accuracy(99.08%),precision(99.31%),recall(98.83%),F_(1)(0.99),and k-value(0.99).(2)The optimum algorithm combination was Savitzky-Golay(S-G)smoothing,principal component analysis(PCA)for sensitive wavelength selection,and broad-learning system(BLS)for modeling.(3)The spectral reflectance corresponding to the sensitive wavelengths dataset of rice canopy spectral images achieved accuracy(80.63%),precision(80.28%),recall(77.03%),F_(1)(0.79),and k-value(0.74)in classifying BPH hazard level by using the optimum algorithm combination.展开更多
There is growing interest in using the urban landscape for stormwater management studies, where land patterns and processes can be important controls for the sustainability of urban development and planning. This pape...There is growing interest in using the urban landscape for stormwater management studies, where land patterns and processes can be important controls for the sustainability of urban development and planning. This paper proposes an original index of Major Hazard Oriented Level （MHOL） and investigates the structure distribution, driving factors, and controlling suggestions of urban-rural land growth in flood-prone areas in the Taihu Lake watershed, China. The MHOL of incremental urban-rural land increased from M 31.51 during the years 1985-1995 to M 38.37 during the years 1995-2010 （M for medium structure distribution, and the number for high-hazard value）. The index shows that urban-rnraI land was distributed uniformly in flood hazard levels and tended to move rapidly to high-hazard areas, where 72.68% of incremental urban-rural land was aggregated maximally in new urban districts along the Huning traffic line and the Yangtze River. Thus, the current accelerating growth of new urban districts could account for the ampliative exposure to high-hazard areas. New districts are driven by the powerful link between land financial benefits and political achievements for local governments and the past unsustainable process of ＂single objective＂ oriented planning. The correlation categorical analysis of the current development intensity and carrying capacity of hydrological ecosystems for sub-basins was used to determine four types of development areas and provide decision makers with indications on the future watershed- scale subdivision of Major Function Oriented Zoning implemented by the Chinese government.展开更多
基金supported by the National Science and Technology Major Projects of Infectious Disease(2012ZX10004-404)
文摘Concern about the biological hazards involved in microbiological research, especially research involving laboratory animals, has increased in recent years. Working in an animal biosafety level 2 facility （ABSL-2）, commonly used for research on infectious diseases, poses various biological hazards. Here, the regulations and standards related to laboratory biosafety in China are introduced, the potential biological hazards present in ABSL-2 facilities are analyzed, and a series of strategies to control the hazards are presented.
文摘To model the damage process of masonry walls under blast loading, a dynamic continuum damage material model is constructed for brick and mortar separately. The degradation of both the stiffness and strength are governed by a damage variable. By using the proposed material model, damage and fragmentation of a typical masonry wall under blast loading at different scaled distances is calculated. The hazard level of the masonry wall to blast loading is evaluated by analyzing the numerical results.
基金financially supported by Key Research and Development Project of China(Grant No.2022YFD2002400)the Key Scientific and Technological Projects in Key Areas of Crops(Grant No.2023AB014)+2 种基金the National Natural Science Foundation of China(Grant No.31901401)the Key Area Research and Development Program of Guangdong(Grant No.2023B0202130001)Guangdong Provincial Basic and Applied Basic Research Fund Project(Grant No.2022A1515011528).
文摘The primary aim of this study was to classify the hazard level of brown planthopper(BPH)damage in rice.Three datasets,including spectral reflectance corresponding to the sensitive wavelengths from rice canopy spectral wavelengths,rice stem spectral wavelengths,and fusion information of rice canopy and stem spectral wavelengths were used for BPH hazard level classification by using different algorithms.Datasets and algorithms were optimized by the BPH hazard level classification effects(which was evaluated by indices of accuracy,precision,recall,F_(1),and k-value).The optimized algorithm combination was used to build a hazard level classification model for spectral reflectance corresponding to the sensitive wavelength from the rice canopy spectral images.Results showed that:(1)The spectral reflectance corresponding to the sensitive wavelengths of fusion information dataset performed best in BPH hazard level classification,with the highest accuracy(99.08%),precision(99.31%),recall(98.83%),F_(1)(0.99),and k-value(0.99).(2)The optimum algorithm combination was Savitzky-Golay(S-G)smoothing,principal component analysis(PCA)for sensitive wavelength selection,and broad-learning system(BLS)for modeling.(3)The spectral reflectance corresponding to the sensitive wavelengths dataset of rice canopy spectral images achieved accuracy(80.63%),precision(80.28%),recall(77.03%),F_(1)(0.79),and k-value(0.74)in classifying BPH hazard level by using the optimum algorithm combination.
文摘There is growing interest in using the urban landscape for stormwater management studies, where land patterns and processes can be important controls for the sustainability of urban development and planning. This paper proposes an original index of Major Hazard Oriented Level （MHOL） and investigates the structure distribution, driving factors, and controlling suggestions of urban-rural land growth in flood-prone areas in the Taihu Lake watershed, China. The MHOL of incremental urban-rural land increased from M 31.51 during the years 1985-1995 to M 38.37 during the years 1995-2010 （M for medium structure distribution, and the number for high-hazard value）. The index shows that urban-rnraI land was distributed uniformly in flood hazard levels and tended to move rapidly to high-hazard areas, where 72.68% of incremental urban-rural land was aggregated maximally in new urban districts along the Huning traffic line and the Yangtze River. Thus, the current accelerating growth of new urban districts could account for the ampliative exposure to high-hazard areas. New districts are driven by the powerful link between land financial benefits and political achievements for local governments and the past unsustainable process of ＂single objective＂ oriented planning. The correlation categorical analysis of the current development intensity and carrying capacity of hydrological ecosystems for sub-basins was used to determine four types of development areas and provide decision makers with indications on the future watershed- scale subdivision of Major Function Oriented Zoning implemented by the Chinese government.
