The continuous advancement of remote sensing technology and artificial intelligence has led to the development of UAV(unmanned aerial vehicle)-based crop phenotyping technology,which is becoming increasingly significa...The continuous advancement of remote sensing technology and artificial intelligence has led to the development of UAV(unmanned aerial vehicle)-based crop phenotyping technology,which is becoming increasingly significant in agricultural research.The hardware,algorithms and application contexts associated with UAV phenotyping technology were comprehensively reviewed as well as its future developments.The characteristics of sensors mounted on UAVs and the types of images they capture were introduced,including RGB(red,gueen,blue),infrared,multispectral and fluorescence imaging sensors.The working principles of these sensors and their applications in phenotyping research were subsequently outlined.For example,RGB imaging sensors were utilized for monitoring plant growth status,while infrared sensors were employed for thermal imaging surveillance.Furthermore,the detailed review of the applications of UAV technology in assessing crop field performance were conducted,estimating plant biomass,addressing biotic and abiotic stresses.In conjunction with UAV technology and genome-wide association study(GWAS),the potential for advancing genetic breeding were explored by identifying genes associated with specific crop traits.Finally,the shortcomings of current UAV technology and propose future prospects and recommendations were concluded to enhance its reliability and effectiveness in supporting agricultural production and research.展开更多
Since the 1960 s, mining science and technology in China has experienced two technical innovations, i.e.the ‘‘Masonry Beam Theory(MBT)" and ‘‘Transfer Rock Beam Theory(TRBT)". Based on those theories, th...Since the 1960 s, mining science and technology in China has experienced two technical innovations, i.e.the ‘‘Masonry Beam Theory(MBT)" and ‘‘Transfer Rock Beam Theory(TRBT)". Based on those theories, the conventional mining method(being called the 121 mining method) was established, consisting of excavating two tunnels with a pillar left for mining a working panel. However, with increasing mining depth,engineering geological disasters in the underground caverns have been frequently encountered. In addition, the use of the coal-pillar mining results in a large amount of coal resources unexploited. In order to address the problems above, the ‘‘Roof Cut Short-Arm Beam Theory(RCSBT), being called the 110 mining method)" was proposed by He Manchao in 2008. The 110 mining method features the mining of one coal seam panel, excavating necessarily only one roadway tunnel and leaving no pillars. Realization of the 110 mining method includes the following steps:(1) directional pre-splitting roof cutting,(2) supporting the roof by using high Constant Resistance Large Deformation bolt/cable(CRLD), and(3) blocking gangue by hydraulic props. This paper presents an overview of the principles, techniques and application of the 110 mining method. Special emphasis is placed on the numerical simulation of the geostress distribution found in the mining panel using the 110 method compared to that of the 121 method. In addition, the stress distribution on the ‘‘short beam" left by the roof cutting when performing the 110 method was also investigated using both numerical simulation and theoretical formulation.展开更多
基金supported by the National Key R&D Program of China(2021YFE0101400)National Natural Science Foundation of China(31871681).
文摘The continuous advancement of remote sensing technology and artificial intelligence has led to the development of UAV(unmanned aerial vehicle)-based crop phenotyping technology,which is becoming increasingly significant in agricultural research.The hardware,algorithms and application contexts associated with UAV phenotyping technology were comprehensively reviewed as well as its future developments.The characteristics of sensors mounted on UAVs and the types of images they capture were introduced,including RGB(red,gueen,blue),infrared,multispectral and fluorescence imaging sensors.The working principles of these sensors and their applications in phenotyping research were subsequently outlined.For example,RGB imaging sensors were utilized for monitoring plant growth status,while infrared sensors were employed for thermal imaging surveillance.Furthermore,the detailed review of the applications of UAV technology in assessing crop field performance were conducted,estimating plant biomass,addressing biotic and abiotic stresses.In conjunction with UAV technology and genome-wide association study(GWAS),the potential for advancing genetic breeding were explored by identifying genes associated with specific crop traits.Finally,the shortcomings of current UAV technology and propose future prospects and recommendations were concluded to enhance its reliability and effectiveness in supporting agricultural production and research.
文摘Since the 1960 s, mining science and technology in China has experienced two technical innovations, i.e.the ‘‘Masonry Beam Theory(MBT)" and ‘‘Transfer Rock Beam Theory(TRBT)". Based on those theories, the conventional mining method(being called the 121 mining method) was established, consisting of excavating two tunnels with a pillar left for mining a working panel. However, with increasing mining depth,engineering geological disasters in the underground caverns have been frequently encountered. In addition, the use of the coal-pillar mining results in a large amount of coal resources unexploited. In order to address the problems above, the ‘‘Roof Cut Short-Arm Beam Theory(RCSBT), being called the 110 mining method)" was proposed by He Manchao in 2008. The 110 mining method features the mining of one coal seam panel, excavating necessarily only one roadway tunnel and leaving no pillars. Realization of the 110 mining method includes the following steps:(1) directional pre-splitting roof cutting,(2) supporting the roof by using high Constant Resistance Large Deformation bolt/cable(CRLD), and(3) blocking gangue by hydraulic props. This paper presents an overview of the principles, techniques and application of the 110 mining method. Special emphasis is placed on the numerical simulation of the geostress distribution found in the mining panel using the 110 method compared to that of the 121 method. In addition, the stress distribution on the ‘‘short beam" left by the roof cutting when performing the 110 method was also investigated using both numerical simulation and theoretical formulation.
