The non-Gaussianity of quantum states incarnates an important resource for improving the performance of continuous-variable quantum information protocols.We propose a novel criterion of non-Gaussianity for single-mode...The non-Gaussianity of quantum states incarnates an important resource for improving the performance of continuous-variable quantum information protocols.We propose a novel criterion of non-Gaussianity for single-mode rotationally symmetric quantum states via the squared Frobenius norm of higher-order cumulant matrix for the quadrature distribution function.As an application,we study the non-Gaussianities of three classes of single-mode symmetric non-Gaussian states:a mixture of vacuum and Fock states,single-photon added thermal states,and even/odd Schr¨odinger cat states.It is shown that such a criterion is faithful and effective for revealing non-Gaussianity.We further extend this criterion to two cases of symmetric multi-mode non-Gaussian states and non-symmetric single-mode non-Gaussian states.展开更多
This paper is devoted to studying the stability of transonic shock solutions to the Euler-Poisson system in a one-dimensional nozzle of finite length.The background charge in the Poisson equation is a piecewise consta...This paper is devoted to studying the stability of transonic shock solutions to the Euler-Poisson system in a one-dimensional nozzle of finite length.The background charge in the Poisson equation is a piecewise constant function.The structural stability of the steady transonic shock solution is obtained by the monotonicity argument.Furthermore,this transonic shock is proved to be dynamically and exponentially stable with respect to small perturbations of the initial data.One of the crucial ingredients of the analysis is to establish the global well-posedness of a free boundary problem for a quasilinear second order equation with nonlinear boundary conditions.展开更多
We study the distribution limit of a class of stochastic evolution equation driven by an additive-stable Non-Gaussian process in the case of α∈(1,2).We prove that,under suitable conditions,the law of the solution co...We study the distribution limit of a class of stochastic evolution equation driven by an additive-stable Non-Gaussian process in the case of α∈(1,2).We prove that,under suitable conditions,the law of the solution converges weakly to the law of a stochastic evolution equation with an additive Gaussian process.展开更多
A real-time tracking system for the fast moving object on the complex background is proposed.The Markov random filed（MRF）model based background subtraction algorithm is used to detect the changing pixels and track t...A real-time tracking system for the fast moving object on the complex background is proposed.The Markov random filed（MRF）model based background subtraction algorithm is used to detect the changing pixels and track the moving object.The prior probability of the segmentation mask is modeled by using MRF,and the object tracking task is translated into the maximum a-posterior（MAP）problem.Experimental results show that the method is efficient at both offline and online moving objects on simple and complex background.展开更多
The pyramidal multiphase level set framework （PMLSF） based on the technique of painting background （TPBG） and the Chan-Vese model can detect multiple objects on a given image. However, the boundaries of the sub-ob...The pyramidal multiphase level set framework （PMLSF） based on the technique of painting background （TPBG） and the Chan-Vese model can detect multiple objects on a given image. However, the boundaries of the sub-object obtained by PMLSF-TPBG are not variable since a specialcolor parameter is used in TPBG. To solve the problem, a new technique utilizing a varying parameter is proposed to ensure that PMLSF is effective for the detection of the desired boundaries of the sub-object. The interval of the variable color parameter is proved and the effects of the parameter are also discussed. Experimental results for the brain tumor detection show that different boundaries of the brain tumors can be detected with different color parameters. It is especially useful for clinical diagnoses.展开更多
Culture background knowledge in English teaching arose in eighties of the twentieth century. It has been closely linked with the reformation and open in China. With the increase of exchange between China and English s...Culture background knowledge in English teaching arose in eighties of the twentieth century. It has been closely linked with the reformation and open in China. With the increase of exchange between China and English speaking countries resulting from the reform and opening policy to the outside world, people have come to find that due to the lack of profound knowledge of the culture of the English speaking, "cultural shock"or "cultural conflict" often arises when Chinese people communicate with Westerners, which leads to the realization that the pure-linguistic centered English teaching form cannot meet the demands of the social development any longer. Culture teaching must be introduced into English teaching in order to learn English language well and communicate well.This essay explains the importance of the cultural background knowledge teaching through analyzing the relationship of the language and culture as well as communicating barrier caused by the cultural differences, and it also submits falsifiable suggestions about how to introduce background knowledge into English teaching.展开更多
The background knowledge has the stimulating function in English listening comprehension; it can reduce the psychological pressure before listening, strengthen the confidence and enhance the predictive ability. Theref...The background knowledge has the stimulating function in English listening comprehension; it can reduce the psychological pressure before listening, strengthen the confidence and enhance the predictive ability. Therefore, the paper mainly discusses the importance and influences of linguistic background knowledge and non-linguistic background knowledge in listening comprehension. The author also gives some suggestions on teaching English listening according to the analysis of significances of background knowledge in the paper.展开更多
This paper presents the differences and relations between background knowledge and domain theories in learning systems. The roles they play during learning procedures are discussed. It is emphasized that background k...This paper presents the differences and relations between background knowledge and domain theories in learning systems. The roles they play during learning procedures are discussed. It is emphasized that background knowledge plays an important role in enhancing the ability of a learning system. An explanation based learning system with domain theory in primary knowledge base and background knowledge in secondary knowledge base is introduced as an example. It shows how background knowledge can be used to solve some of the problems caused by incomplete domain theory in an explanation based learning system. The system can accomplish knowledge level learning through purely deductive approach. At last the acquisition of background knowledge is briefly discussed.展开更多
Intercultural Communication Competence (ICC), as one of the research fields of intercultural communication, has been given much importance from scholars all around the world. Intercultural sensitivity is one of the th...Intercultural Communication Competence (ICC), as one of the research fields of intercultural communication, has been given much importance from scholars all around the world. Intercultural sensitivity is one of the three dimensions in Dr Chen's ICC model. This research investigates the reliability and validity of Chen and Starosta's Intercultural Sensitivity Scale (ISS) (2000) against Chinese cultural background by using Chinese university students majoring in English as respondents.展开更多
The paper put emphasis on the significance of the background knowledge of college English.Taking into consideration the particularity of vocational technical students,the teacher should enrich themselves first and the...The paper put emphasis on the significance of the background knowledge of college English.Taking into consideration the particularity of vocational technical students,the teacher should enrich themselves first and then meet their need.There are many ways to promote the quality of students in English class,one of which is to fire them with the vivid introduction of background knowledge.展开更多
With globalization there is an increasing need for spoken English for Chinese college students. However, the situation of the teaching system of spoken English in most universities in China is not satisfactory. Influe...With globalization there is an increasing need for spoken English for Chinese college students. However, the situation of the teaching system of spoken English in most universities in China is not satisfactory. Influenced by the exam-oriented teaching system, great importance has been put on English grammar and the skills of reading and writing. As a result, students'enthusiasm in improving their spoken English is diminished. Actually, students need some knowledge about English culture background before they can communicate effectively. It is significant for teachers to find out the students'wants and lacks during their spoken English study. Besides, attentions should be paid to English culture background in spoken English classes by both teachers and students. This paper mainly aimed at finding out the needs of students for English culture background in spoken English classes based on the theory of needs analysis.展开更多
基金Project supported by the Natural Science Foundation of Hunan Province of China(Grant No.2021JJ30535)。
文摘The non-Gaussianity of quantum states incarnates an important resource for improving the performance of continuous-variable quantum information protocols.We propose a novel criterion of non-Gaussianity for single-mode rotationally symmetric quantum states via the squared Frobenius norm of higher-order cumulant matrix for the quadrature distribution function.As an application,we study the non-Gaussianities of three classes of single-mode symmetric non-Gaussian states:a mixture of vacuum and Fock states,single-photon added thermal states,and even/odd Schr¨odinger cat states.It is shown that such a criterion is faithful and effective for revealing non-Gaussianity.We further extend this criterion to two cases of symmetric multi-mode non-Gaussian states and non-symmetric single-mode non-Gaussian states.
基金supported by the National Natural Science Foundation of China(11871134,12171166)the Fundamental Research Funds for the Central Universities(DUT23LAB303)。
文摘This paper is devoted to studying the stability of transonic shock solutions to the Euler-Poisson system in a one-dimensional nozzle of finite length.The background charge in the Poisson equation is a piecewise constant function.The structural stability of the steady transonic shock solution is obtained by the monotonicity argument.Furthermore,this transonic shock is proved to be dynamically and exponentially stable with respect to small perturbations of the initial data.One of the crucial ingredients of the analysis is to establish the global well-posedness of a free boundary problem for a quasilinear second order equation with nonlinear boundary conditions.
基金Supported by the Science and Technology Research Projects of Hubei Provincial Department of Education(B2022077)。
文摘We study the distribution limit of a class of stochastic evolution equation driven by an additive-stable Non-Gaussian process in the case of α∈(1,2).We prove that,under suitable conditions,the law of the solution converges weakly to the law of a stochastic evolution equation with an additive Gaussian process.
文摘A real-time tracking system for the fast moving object on the complex background is proposed.The Markov random filed（MRF）model based background subtraction algorithm is used to detect the changing pixels and track the moving object.The prior probability of the segmentation mask is modeled by using MRF,and the object tracking task is translated into the maximum a-posterior（MAP）problem.Experimental results show that the method is efficient at both offline and online moving objects on simple and complex background.
文摘The pyramidal multiphase level set framework （PMLSF） based on the technique of painting background （TPBG） and the Chan-Vese model can detect multiple objects on a given image. However, the boundaries of the sub-object obtained by PMLSF-TPBG are not variable since a specialcolor parameter is used in TPBG. To solve the problem, a new technique utilizing a varying parameter is proposed to ensure that PMLSF is effective for the detection of the desired boundaries of the sub-object. The interval of the variable color parameter is proved and the effects of the parameter are also discussed. Experimental results for the brain tumor detection show that different boundaries of the brain tumors can be detected with different color parameters. It is especially useful for clinical diagnoses.
文摘Culture background knowledge in English teaching arose in eighties of the twentieth century. It has been closely linked with the reformation and open in China. With the increase of exchange between China and English speaking countries resulting from the reform and opening policy to the outside world, people have come to find that due to the lack of profound knowledge of the culture of the English speaking, "cultural shock"or "cultural conflict" often arises when Chinese people communicate with Westerners, which leads to the realization that the pure-linguistic centered English teaching form cannot meet the demands of the social development any longer. Culture teaching must be introduced into English teaching in order to learn English language well and communicate well.This essay explains the importance of the cultural background knowledge teaching through analyzing the relationship of the language and culture as well as communicating barrier caused by the cultural differences, and it also submits falsifiable suggestions about how to introduce background knowledge into English teaching.
文摘The background knowledge has the stimulating function in English listening comprehension; it can reduce the psychological pressure before listening, strengthen the confidence and enhance the predictive ability. Therefore, the paper mainly discusses the importance and influences of linguistic background knowledge and non-linguistic background knowledge in listening comprehension. The author also gives some suggestions on teaching English listening according to the analysis of significances of background knowledge in the paper.
文摘This paper presents the differences and relations between background knowledge and domain theories in learning systems. The roles they play during learning procedures are discussed. It is emphasized that background knowledge plays an important role in enhancing the ability of a learning system. An explanation based learning system with domain theory in primary knowledge base and background knowledge in secondary knowledge base is introduced as an example. It shows how background knowledge can be used to solve some of the problems caused by incomplete domain theory in an explanation based learning system. The system can accomplish knowledge level learning through purely deductive approach. At last the acquisition of background knowledge is briefly discussed.
文摘Intercultural Communication Competence (ICC), as one of the research fields of intercultural communication, has been given much importance from scholars all around the world. Intercultural sensitivity is one of the three dimensions in Dr Chen's ICC model. This research investigates the reliability and validity of Chen and Starosta's Intercultural Sensitivity Scale (ISS) (2000) against Chinese cultural background by using Chinese university students majoring in English as respondents.
文摘The paper put emphasis on the significance of the background knowledge of college English.Taking into consideration the particularity of vocational technical students,the teacher should enrich themselves first and then meet their need.There are many ways to promote the quality of students in English class,one of which is to fire them with the vivid introduction of background knowledge.
文摘With globalization there is an increasing need for spoken English for Chinese college students. However, the situation of the teaching system of spoken English in most universities in China is not satisfactory. Influenced by the exam-oriented teaching system, great importance has been put on English grammar and the skills of reading and writing. As a result, students'enthusiasm in improving their spoken English is diminished. Actually, students need some knowledge about English culture background before they can communicate effectively. It is significant for teachers to find out the students'wants and lacks during their spoken English study. Besides, attentions should be paid to English culture background in spoken English classes by both teachers and students. This paper mainly aimed at finding out the needs of students for English culture background in spoken English classes based on the theory of needs analysis.
