西门子推出全新分布式I/O产品线——Simatic ET 200AL西门子近期展出了全新的分布式L/O产品——Simatic ET 200AL。该系列是Simatic ET 200分布式I/O产品家族的新成员,具有IP65/67高防护等级,其结构紧凑,重量轻,体积小,适用于安装空间...西门子推出全新分布式I/O产品线——Simatic ET 200AL西门子近期展出了全新的分布式L/O产品——Simatic ET 200AL。该系列是Simatic ET 200分布式I/O产品家族的新成员,具有IP65/67高防护等级,其结构紧凑,重量轻,体积小,适用于安装空间狭小和具有移动设备的场合。它坚固耐用,适用的温度范围为-25~55℃。展开更多
ABB推出新型Azipod电力推进系统
2015年3月24日,A B B发布了其Azipod电力推进系统的最新成员——AzipodD型推进器。该款新产品秉承了Azipod电力推进系统一贯的可靠性和灵活性,且广泛适用于各类船舶,有助于推动这一绿色高效推...ABB推出新型Azipod电力推进系统
2015年3月24日,A B B发布了其Azipod电力推进系统的最新成员——AzipodD型推进器。该款新产品秉承了Azipod电力推进系统一贯的可靠性和灵活性,且广泛适用于各类船舶,有助于推动这一绿色高效推进系统在更多船舶类型上的普及应用。凭借更高灵活性、可靠性及能源效率,ABB Azipod无齿轮推进系统已成为游轮、破冰船、冰区航行货船和海上居住平台的首选。而AzipodD型推进器的推出将为近海钻探船、工程船、支援船和渡轮等船运市场提供更多选择。展开更多
Carbon dots(CDs) are potentially useful in many areas such as bioimaging, light-emitting diodes, and sensing because of their excellent optical properties, high biocompatibility, and low toxicity.Knowledge of their ph...Carbon dots(CDs) are potentially useful in many areas such as bioimaging, light-emitting diodes, and sensing because of their excellent optical properties, high biocompatibility, and low toxicity.Knowledge of their photoluminescence(PL) mechanisms, which have been widely studied, is of significance in guiding the synthesis and promoting applications of CDs with tunable PL emissions. However,the intrinsic mechanism of PL emission remains unclear, and a unified mechanism has not been found because of differences in particle structures. This review generalizes the categories of CDs, noting their structural diversity. Three types of PL mechanism pertaining to structural differences are outlined: internal factors dominated emission(including the conjugation effect, the surface state, and the synergistic effect), external factors dominated emission(including the molecular state and the environment effect),and crosslink-enhanced emission. Optical applications of CDs are also briefly mentioned. Finally, the prospects for research into PL mechanisms are discussed, noting the remaining challenges and directions for future work.展开更多
Clonal selection feature selection algorithm （CSFS） based on clonal selection algorithm （CSA）, a new computational intelligence approach, has been proposed to perform the task of dimensionality reduction in high-d...Clonal selection feature selection algorithm （CSFS） based on clonal selection algorithm （CSA）, a new computational intelligence approach, has been proposed to perform the task of dimensionality reduction in high-dimensional images, and has better performance than traditional feature selection algorithms with more computational costs. In this paper, a fast clonal selection feature selection algorithm （FCSFS） for hyperspectral imagery is proposed to improve the convergence rate by using Cauchy mutation instead of non-uniform mutation as the primary immune operator. Two experiments are performed to evaluate the performance of the proposed algorithm in comparison with CSFS using hyperspectral remote sensing imagery acquired by the pushbroom hyperspectral imager （PHI） and the airborne visible/infrared imaging spectrometer （AVlRIS）, respectively. Experimental results demonstrate that the FCSFS converges faster than CSFS, hence providing an effective new option for dimensionality reduction of hyperspectral remote sensing imagery.展开更多
文摘西门子推出全新分布式I/O产品线——Simatic ET 200AL西门子近期展出了全新的分布式L/O产品——Simatic ET 200AL。该系列是Simatic ET 200分布式I/O产品家族的新成员,具有IP65/67高防护等级,其结构紧凑,重量轻,体积小,适用于安装空间狭小和具有移动设备的场合。它坚固耐用,适用的温度范围为-25~55℃。
文摘ABB推出新型Azipod电力推进系统
2015年3月24日,A B B发布了其Azipod电力推进系统的最新成员——AzipodD型推进器。该款新产品秉承了Azipod电力推进系统一贯的可靠性和灵活性,且广泛适用于各类船舶,有助于推动这一绿色高效推进系统在更多船舶类型上的普及应用。凭借更高灵活性、可靠性及能源效率,ABB Azipod无齿轮推进系统已成为游轮、破冰船、冰区航行货船和海上居住平台的首选。而AzipodD型推进器的推出将为近海钻探船、工程船、支援船和渡轮等船运市场提供更多选择。
基金financially supported by the National Natural Science Foundation of China(21905253,51973200)the China Postdoctoral Science Foundation(2018M640681,2019T120632)。
文摘Carbon dots(CDs) are potentially useful in many areas such as bioimaging, light-emitting diodes, and sensing because of their excellent optical properties, high biocompatibility, and low toxicity.Knowledge of their photoluminescence(PL) mechanisms, which have been widely studied, is of significance in guiding the synthesis and promoting applications of CDs with tunable PL emissions. However,the intrinsic mechanism of PL emission remains unclear, and a unified mechanism has not been found because of differences in particle structures. This review generalizes the categories of CDs, noting their structural diversity. Three types of PL mechanism pertaining to structural differences are outlined: internal factors dominated emission(including the conjugation effect, the surface state, and the synergistic effect), external factors dominated emission(including the molecular state and the environment effect),and crosslink-enhanced emission. Optical applications of CDs are also briefly mentioned. Finally, the prospects for research into PL mechanisms are discussed, noting the remaining challenges and directions for future work.
基金Supported by the Major State Basic Research Development Program (973 Program) of China (No. 2009CB723905)the National High Technology Research and Development Program (863 Program) of China (Nos.2009AA12Z114, 2007AA12Z148, 2007AA12Z181)+2 种基金the National Natural Sci-ence Foundation of China(Nos. 40771139,40523005, 40721001)the Research Fund for the Doctoral Program of Higher Education of China(No.200804861058)the Foundation of National Laboratory of Pattern Recognition
文摘Clonal selection feature selection algorithm （CSFS） based on clonal selection algorithm （CSA）, a new computational intelligence approach, has been proposed to perform the task of dimensionality reduction in high-dimensional images, and has better performance than traditional feature selection algorithms with more computational costs. In this paper, a fast clonal selection feature selection algorithm （FCSFS） for hyperspectral imagery is proposed to improve the convergence rate by using Cauchy mutation instead of non-uniform mutation as the primary immune operator. Two experiments are performed to evaluate the performance of the proposed algorithm in comparison with CSFS using hyperspectral remote sensing imagery acquired by the pushbroom hyperspectral imager （PHI） and the airborne visible/infrared imaging spectrometer （AVlRIS）, respectively. Experimental results demonstrate that the FCSFS converges faster than CSFS, hence providing an effective new option for dimensionality reduction of hyperspectral remote sensing imagery.
