Ocean temperature is an important physical variable in marine ecosystems,and ocean temperature prediction is an important research objective in ocean-related fields.Currently,one of the commonly used methods for ocean...Ocean temperature is an important physical variable in marine ecosystems,and ocean temperature prediction is an important research objective in ocean-related fields.Currently,one of the commonly used methods for ocean temperature prediction is based on data-driven,but research on this method is mostly limited to the sea surface,with few studies on the prediction of internal ocean temperature.Existing graph neural network-based methods usually use predefined graphs or learned static graphs,which cannot capture the dynamic associations among data.In this study,we propose a novel dynamic spatiotemporal graph neural network(DSTGN)to predict threedimensional ocean temperature(3D-OT),which combines static graph learning and dynamic graph learning to automatically mine two unknown dependencies between sequences based on the original 3D-OT data without prior knowledge.Temporal and spatial dependencies in the time series were then captured using temporal and graph convolutions.We also integrated dynamic graph learning,static graph learning,graph convolution,and temporal convolution into an end-to-end framework for 3D-OT prediction using time-series grid data.In this study,we conducted prediction experiments using high-resolution 3D-OT from the Copernicus global ocean physical reanalysis,with data covering the vertical variation of temperature from the sea surface to 1000 m below the sea surface.We compared five mainstream models that are commonly used for ocean temperature prediction,and the results showed that the method achieved the best prediction results at all prediction scales.展开更多
The paper discusses the application of three-dimensional textbook in English teaching. The three-dimensional textbook plays an incomparable function than the traditional textbook and thus has an extensive application ...The paper discusses the application of three-dimensional textbook in English teaching. The three-dimensional textbook plays an incomparable function than the traditional textbook and thus has an extensive application in the college English education. It demonstrates the application through the usage of the three-dimensional textbook in the real teaching and shows that excessive usage of sound and pictures or drawings may distract the attention of students. It raises several suggestions at the end.展开更多
An orthotropic functionally graded piezoelectric rectangular plate with arbitrarily distributed material properties was studied, which is simply supported and grounded（electrically） on its four lateral edges. The st...An orthotropic functionally graded piezoelectric rectangular plate with arbitrarily distributed material properties was studied, which is simply supported and grounded（electrically） on its four lateral edges. The state equations of the functionally graded piezoelectric material were obtained using the state-space approach, and a Peano-Baker series solution was obtained for the coupled electroelastic fi elds of the functionally graded piezoelectric plate subjected to mechanical and electric loading on its upper and lower surfaces. The influence of different distributions of material properties on the structural response of the plate was studied using the obtained solutions.展开更多
《华英联珠分类集成》(A Course of Lessons in Spoken Mandarin)是20世纪初以古安(Gouin)教学法为指导编写的一本口语教材。作者文焕章(J.Endicott)提倡学习整个句子,并说出完整的句子,全书100课,全部由句子构成,体现了"句本位&qu...《华英联珠分类集成》(A Course of Lessons in Spoken Mandarin)是20世纪初以古安(Gouin)教学法为指导编写的一本口语教材。作者文焕章(J.Endicott)提倡学习整个句子,并说出完整的句子,全书100课,全部由句子构成,体现了"句本位"的教学观。本书旨在口语教学,书中不解释语法规则,不建议学生在初始阶段认读汉字,强调学生应该尽早养成学习谚语、俗语的习惯。为了增加趣味性,教材选取了很多中国历史和故事,这样学生在学习汉语知识的同时,还可以增强对中国文化的了解。为提高教材的可用性,作者还根据学习需求增加了很多新内容,并译成英文。另外,课本的设计也大大方便了学生的使用。该教材虽然也有不尽如人意之处,不过,对当今汉语教材编写仍有借鉴意义。展开更多
本文借助软件Word Smith Tools 6.0,从数量、频次和分布这三个方面出发,对初中英语教材Go for it中的搭配进行了分析。研究发现:(1)Go for it中的搭配数量满足课程标准的要求;(2)低频搭配数量多。教材中共有154个搭配出现在6次以下,占...本文借助软件Word Smith Tools 6.0,从数量、频次和分布这三个方面出发,对初中英语教材Go for it中的搭配进行了分析。研究发现:(1)Go for it中的搭配数量满足课程标准的要求;(2)低频搭配数量多。教材中共有154个搭配出现在6次以下,占总数的73.7%;(3)分布在各年级教材中的搭配在数量上没有显著性差异。但当考虑到搭配分布和频次关系的时候,研究发现有的搭配尽管出现频次高,分布范围却很窄。展开更多
基金The National Key R&D Program of China under contract No.2021YFC3101603.
文摘Ocean temperature is an important physical variable in marine ecosystems,and ocean temperature prediction is an important research objective in ocean-related fields.Currently,one of the commonly used methods for ocean temperature prediction is based on data-driven,but research on this method is mostly limited to the sea surface,with few studies on the prediction of internal ocean temperature.Existing graph neural network-based methods usually use predefined graphs or learned static graphs,which cannot capture the dynamic associations among data.In this study,we propose a novel dynamic spatiotemporal graph neural network(DSTGN)to predict threedimensional ocean temperature(3D-OT),which combines static graph learning and dynamic graph learning to automatically mine two unknown dependencies between sequences based on the original 3D-OT data without prior knowledge.Temporal and spatial dependencies in the time series were then captured using temporal and graph convolutions.We also integrated dynamic graph learning,static graph learning,graph convolution,and temporal convolution into an end-to-end framework for 3D-OT prediction using time-series grid data.In this study,we conducted prediction experiments using high-resolution 3D-OT from the Copernicus global ocean physical reanalysis,with data covering the vertical variation of temperature from the sea surface to 1000 m below the sea surface.We compared five mainstream models that are commonly used for ocean temperature prediction,and the results showed that the method achieved the best prediction results at all prediction scales.
文摘The paper discusses the application of three-dimensional textbook in English teaching. The three-dimensional textbook plays an incomparable function than the traditional textbook and thus has an extensive application in the college English education. It demonstrates the application through the usage of the three-dimensional textbook in the real teaching and shows that excessive usage of sound and pictures or drawings may distract the attention of students. It raises several suggestions at the end.
基金Funded by the National Natural Science Foundation of China(Nos.11102136 and 41362016)the Open Project of Guangxi Key Laboratory of Disaster Prevention and Structural Safety(No.2013ZDK09)
文摘An orthotropic functionally graded piezoelectric rectangular plate with arbitrarily distributed material properties was studied, which is simply supported and grounded（electrically） on its four lateral edges. The state equations of the functionally graded piezoelectric material were obtained using the state-space approach, and a Peano-Baker series solution was obtained for the coupled electroelastic fi elds of the functionally graded piezoelectric plate subjected to mechanical and electric loading on its upper and lower surfaces. The influence of different distributions of material properties on the structural response of the plate was studied using the obtained solutions.
文摘《华英联珠分类集成》(A Course of Lessons in Spoken Mandarin)是20世纪初以古安(Gouin)教学法为指导编写的一本口语教材。作者文焕章(J.Endicott)提倡学习整个句子,并说出完整的句子,全书100课,全部由句子构成,体现了"句本位"的教学观。本书旨在口语教学,书中不解释语法规则,不建议学生在初始阶段认读汉字,强调学生应该尽早养成学习谚语、俗语的习惯。为了增加趣味性,教材选取了很多中国历史和故事,这样学生在学习汉语知识的同时,还可以增强对中国文化的了解。为提高教材的可用性,作者还根据学习需求增加了很多新内容,并译成英文。另外,课本的设计也大大方便了学生的使用。该教材虽然也有不尽如人意之处,不过,对当今汉语教材编写仍有借鉴意义。
文摘本文借助软件Word Smith Tools 6.0,从数量、频次和分布这三个方面出发,对初中英语教材Go for it中的搭配进行了分析。研究发现:(1)Go for it中的搭配数量满足课程标准的要求;(2)低频搭配数量多。教材中共有154个搭配出现在6次以下,占总数的73.7%;(3)分布在各年级教材中的搭配在数量上没有显著性差异。但当考虑到搭配分布和频次关系的时候,研究发现有的搭配尽管出现频次高,分布范围却很窄。
