The paper generalizes the direct method of moving planes to the Logarithmic Laplacian system.Firstly,some key ingredients of the method are discussed,for example,Narrow region principle and Decay at infinity.Then,the ...The paper generalizes the direct method of moving planes to the Logarithmic Laplacian system.Firstly,some key ingredients of the method are discussed,for example,Narrow region principle and Decay at infinity.Then,the radial symmetry of the solution of the Logarithmic Laplacian system is obtained.展开更多
We give the direct method of moving planes for solutions to the conformally invariant fractional power sub Laplace equation on the Heisenberg group.The method is based on four maximum principles derived here.Then symm...We give the direct method of moving planes for solutions to the conformally invariant fractional power sub Laplace equation on the Heisenberg group.The method is based on four maximum principles derived here.Then symmetry and nonexistence of positive cylindrical solutions are proved.展开更多
The basic principles of target detection by forward acoustic scattering are presented.A direct blast suppression approach based on adaptive filtering(DBS-AF) is proposed to suppress the direct blast.The DBS-AF techniq...The basic principles of target detection by forward acoustic scattering are presented.A direct blast suppression approach based on adaptive filtering(DBS-AF) is proposed to suppress the direct blast.The DBS-AF technique is extended to the linear frequency modulation(LFM) signal,where the envelope of the signal is regarded as a 'general waveform' and imported into the adaptive filter.Application of the DBS-AF method to the data collected from a lake trial yields an output detection curve,in which the direct blast is mapped to the background while the acoustic field aberration is represented by the peak value fluctuation.The inhibitory effect in single hydrophone is approximately- 5 dB,and is then enhanced by exploiting the mean value removal approach as a preprocessing technique.The direct blast is further suppressed to a level of-10 dB by making full use of multichannel receptions.The main factors affecting the algorithm performance are as follows:the fluctuation degree of the receptions during the weighting vector training period and the power ratio of the forward scattered wave to the direct blast when the target is present.展开更多
This study is undertaken to find out writers' attention patterns in these two different writing methods (the direct method and the translation-based method) during the writing process through the think-aloud metho...This study is undertaken to find out writers' attention patterns in these two different writing methods (the direct method and the translation-based method) during the writing process through the think-aloud method and EFL learners' perception of the advantages and disadvantages of those two writing methods.The results show that the subjects' attention patterns in the direct method and in the translation-based method are quite different and the differences are mainly embodied in the linguistic level attention and personal comment.As far as the subjects are concerned,writing directly in English is easier and faster than writing through translation,and the direct writing method often helps them learn English language and forces them to focus on English expression.In contrast,for the translation-based writing method,the subjects as a whole relate that they have a wide range of vocabulary and expressions,have a greater number of ideas,and can think through ideas clearly.展开更多
This study attempts to explore the relationship between translation and English as a foreign language writing proficiency and the writing time's effect on this relationship through detailed analysis of a case stud...This study attempts to explore the relationship between translation and English as a foreign language writing proficiency and the writing time's effect on this relationship through detailed analysis of a case study of sixteen English majors who are required to write four English compositions, each time each group adopting one of the two different writing methods: the direct method and the translation-based method. The first two writing tasks have a time limit of 45 minutes while the latter two do not. The results show that the translation-based method has advantages over the direct writing method with regard to the quality of the compositions. Based on this finding, the author claims that the translation-based method is an effective way to train and enhance EFL learners' English writing ability.展开更多
基金Supported by the National Natural Science Foundation of China(11501342,12001344)。
文摘The paper generalizes the direct method of moving planes to the Logarithmic Laplacian system.Firstly,some key ingredients of the method are discussed,for example,Narrow region principle and Decay at infinity.Then,the radial symmetry of the solution of the Logarithmic Laplacian system is obtained.
基金supported by the National Natural Science Foundation of China(No.11771354)。
文摘We give the direct method of moving planes for solutions to the conformally invariant fractional power sub Laplace equation on the Heisenberg group.The method is based on four maximum principles derived here.Then symmetry and nonexistence of positive cylindrical solutions are proved.
基金supported by the National Natural Science Foundation of China(11174235,61571366)
文摘The basic principles of target detection by forward acoustic scattering are presented.A direct blast suppression approach based on adaptive filtering(DBS-AF) is proposed to suppress the direct blast.The DBS-AF technique is extended to the linear frequency modulation(LFM) signal,where the envelope of the signal is regarded as a 'general waveform' and imported into the adaptive filter.Application of the DBS-AF method to the data collected from a lake trial yields an output detection curve,in which the direct blast is mapped to the background while the acoustic field aberration is represented by the peak value fluctuation.The inhibitory effect in single hydrophone is approximately- 5 dB,and is then enhanced by exploiting the mean value removal approach as a preprocessing technique.The direct blast is further suppressed to a level of-10 dB by making full use of multichannel receptions.The main factors affecting the algorithm performance are as follows:the fluctuation degree of the receptions during the weighting vector training period and the power ratio of the forward scattered wave to the direct blast when the target is present.
文摘This study is undertaken to find out writers' attention patterns in these two different writing methods (the direct method and the translation-based method) during the writing process through the think-aloud method and EFL learners' perception of the advantages and disadvantages of those two writing methods.The results show that the subjects' attention patterns in the direct method and in the translation-based method are quite different and the differences are mainly embodied in the linguistic level attention and personal comment.As far as the subjects are concerned,writing directly in English is easier and faster than writing through translation,and the direct writing method often helps them learn English language and forces them to focus on English expression.In contrast,for the translation-based writing method,the subjects as a whole relate that they have a wide range of vocabulary and expressions,have a greater number of ideas,and can think through ideas clearly.
文摘This study attempts to explore the relationship between translation and English as a foreign language writing proficiency and the writing time's effect on this relationship through detailed analysis of a case study of sixteen English majors who are required to write four English compositions, each time each group adopting one of the two different writing methods: the direct method and the translation-based method. The first two writing tasks have a time limit of 45 minutes while the latter two do not. The results show that the translation-based method has advantages over the direct writing method with regard to the quality of the compositions. Based on this finding, the author claims that the translation-based method is an effective way to train and enhance EFL learners' English writing ability.
