The chemistry course in senior high school is both experimental and practical. Under the ideological background of subject core literacy, the optimization and adjustment of chemistry experiment teaching has been promo...The chemistry course in senior high school is both experimental and practical. Under the ideological background of subject core literacy, the optimization and adjustment of chemistry experiment teaching has been promoted to an unprecedented height. Applying the inquiry teaching mode of chemistry experiment has become a shortcut to improve students core literacy. Teachers devote more energy to the planning and application of inquiry-based teaching mode of chemical experiment, which can not only bring students a refreshing experience of experimental inquiry, but also effectively enhance students independent experimental ability and scientific inquiry spirit, so that students scientific thinking and chemical experiment skills can be effectively tempered and strengthened. Therefore, in the process of high school chemistry teaching reform under the new curriculum standard, teachers should actively explore the implementation of inquiry-based teaching mode of chemistry experiment, and establish a clear orientation of independent inquiry and development for chemistry experiment teaching, so as to help students develop a good sense of experimental inquiry and innovation.展开更多
With the development of large scale text processing, the dimension of text feature space has become larger and larger, which has added a lot of difficulties to natural language processing. How to reduce the dimension...With the development of large scale text processing, the dimension of text feature space has become larger and larger, which has added a lot of difficulties to natural language processing. How to reduce the dimension has become a practical problem in the field. Here we present two clustering methods, i.e. concept association and concept abstract, to achieve the goal. The first refers to the keyword clustering based on the co occurrence of展开更多
This paper reports the experimental realization of efficiently sorting vector beams by polarization topological charge （PTC）. The PTC of a vector beam can be defined as the repetition number of polarization state ch...This paper reports the experimental realization of efficiently sorting vector beams by polarization topological charge （PTC）. The PTC of a vector beam can be defined as the repetition number of polarization state change along the azimuthal axis, while its sign stands for the rotating direction of the polarization. Here, a couple of liquid crystal Pancharatnam-Berry optical dements （PBOEs） have been used to introduce conjugated spatial phase modulations for two orthogonal circular polarization states. Applying these PBOEs in a 4-foptical system, our experiments show the setup can work for PTC sorting with a separation efficiency of more than 58%. This work provides an effective way to decode information from different PTCs, which may be interesting in many fields, especially in optical communication.展开更多
文摘The chemistry course in senior high school is both experimental and practical. Under the ideological background of subject core literacy, the optimization and adjustment of chemistry experiment teaching has been promoted to an unprecedented height. Applying the inquiry teaching mode of chemistry experiment has become a shortcut to improve students core literacy. Teachers devote more energy to the planning and application of inquiry-based teaching mode of chemical experiment, which can not only bring students a refreshing experience of experimental inquiry, but also effectively enhance students independent experimental ability and scientific inquiry spirit, so that students scientific thinking and chemical experiment skills can be effectively tempered and strengthened. Therefore, in the process of high school chemistry teaching reform under the new curriculum standard, teachers should actively explore the implementation of inquiry-based teaching mode of chemistry experiment, and establish a clear orientation of independent inquiry and development for chemistry experiment teaching, so as to help students develop a good sense of experimental inquiry and innovation.
文摘With the development of large scale text processing, the dimension of text feature space has become larger and larger, which has added a lot of difficulties to natural language processing. How to reduce the dimension has become a practical problem in the field. Here we present two clustering methods, i.e. concept association and concept abstract, to achieve the goal. The first refers to the keyword clustering based on the co occurrence of
基金National Natural Science Foundation of China(NSFC)(61490710,61705132,61775142)Science and Technology Planning Project of Guangdong Province(2016B050501005)Specialized Research Fund for the Shenzhen Strategic Emerging Industries Development(JCYJ20170412105812811)
文摘This paper reports the experimental realization of efficiently sorting vector beams by polarization topological charge （PTC）. The PTC of a vector beam can be defined as the repetition number of polarization state change along the azimuthal axis, while its sign stands for the rotating direction of the polarization. Here, a couple of liquid crystal Pancharatnam-Berry optical dements （PBOEs） have been used to introduce conjugated spatial phase modulations for two orthogonal circular polarization states. Applying these PBOEs in a 4-foptical system, our experiments show the setup can work for PTC sorting with a separation efficiency of more than 58%. This work provides an effective way to decode information from different PTCs, which may be interesting in many fields, especially in optical communication.
