Let Cnk denote the set of all t -subsets of an n -set. Assume A ∈ Cnk and B∈Cn.b (A,B) is called a cross-2-intersecting family if |A∩B|≥2 for any A∈A, B∈B.In this paper, the best upper bounds of the cardinalitie...Let Cnk denote the set of all t -subsets of an n -set. Assume A ∈ Cnk and B∈Cn.b (A,B) is called a cross-2-intersecting family if |A∩B|≥2 for any A∈A, B∈B.In this paper, the best upper bounds of the cardinalities for non-empty cross-2-intersecting families of a- and i- subsets are obtained for some n and b . A new proof for a Frankl-Tokushige theorem [6] is also given.展开更多
The global solution for a coupled nonlinear Klein-Gordon system in two- dimensional space was studied. First, a sharp threshold of blowup and global existence for the system was obtained by constructing a type of cros...The global solution for a coupled nonlinear Klein-Gordon system in two- dimensional space was studied. First, a sharp threshold of blowup and global existence for the system was obtained by constructing a type of cross-constrained variational problem and establishing so-called cross-invariant manifolds of the evolution flow. Then the result of how small the initial data for which the solution exists globally was proved by using the scaling argument.展开更多
Communication based train control systems （CBTC） must work even in the worst situation-- train crossing. This paper models the propagation characteristics in one of the most common and piv- otal scenarios--train cro...Communication based train control systems （CBTC） must work even in the worst situation-- train crossing. This paper models the propagation characteristics in one of the most common and piv- otal scenarios--train crossing in subway tunnels which is rarely mentioned in previous publications. Firstly, measurements for train crossing scenario at 2.4 GHz in a real subway line in Madrid have been made. The field measurement is the most reliable way to reveal the propagation characteristics involving shadowing effect and fast fading. Moreover, to precisely describe the fast fading distribu- tion and eliminate the inevitable weak points of traditional fitting way, a best numerical approxima- tion method using Legendre orthogonal polynomials has been proposed. Comparisons show that this method works better and is of greater physical significance. Finally, a complete statistical model is given and all the coefficients can be applied by system designers for the link and system level simu- lations.展开更多
Nowadays, cross-cultural study is turning to pragmatic fields concerning communication, such as business negotiation,overseas life and language teaching, etc. This paper reviews previous studies of culture and communi...Nowadays, cross-cultural study is turning to pragmatic fields concerning communication, such as business negotiation,overseas life and language teaching, etc. This paper reviews previous studies of culture and communication, attempting to reveal how to have affective communication from perspective of cultural context by case studies. As a result, theoretical foundation and case studies prove that although we have cooperative principles as general guidelines for communication, cultural awareness, especially awareness of High Context(HC) and Low Context(LC), still plays a key role in cross-cultural communication by making up for the lost of meaning while transmission.展开更多
CD4^(+)T cells can"help"or"license" conventional type 1 dendritic cells(cDC1s)to induce CD8^(+)cytotoxic T lymphocyte(CTL)anticancer responses,as proven in mouse models.We recently identified cDC1s...CD4^(+)T cells can"help"or"license" conventional type 1 dendritic cells(cDC1s)to induce CD8^(+)cytotoxic T lymphocyte(CTL)anticancer responses,as proven in mouse models.We recently identified cDC1s with a transcriptomic imprint of CD4^(+)T-cell help,specifically in T-cell-infiltrated human cancers,and these cells were associated with a good prognosis and response to PD-1-targeting immunotherapy.Here,we delineate the mechanism of cDC1 licensing by CD4^(+)T cells in humans.Activated CD4^(+)T cells produce IFNβvia the STING pathway,which promotes MHC-I antigen(cross-)presentation by cDC1s and thereby improves their ability to induce CTL anticancer responses.In cooperation with CD40 ligand(L),IFNβalso optimizes the costimulatory and other functions of cDC1s required for CTL response induction.IFN-I-producing CD4^(+)T cells are present in diverse T-cell-infiltrated cancers and likely deliver“help”signals to CTLs locally,according to their transcriptomic profile and colocalization with“helped/licensed”cDCs and tumor-reactive CD8^(+)T cells.In agreement with this scenario,the presence of IFN-I-producing CD4^(+)T cells in the TME is associated with overall survival and the response to PD-1 checkpoint blockade in cancer patients.展开更多
This study explored the relationship between LLS and LA in two different cultural contexts. The findings revealed that the differences between Australian and Chinese university students tend to lie more in their langu...This study explored the relationship between LLS and LA in two different cultural contexts. The findings revealed that the differences between Australian and Chinese university students tend to lie more in their language proficiency levels than in cultural factors. This study also compares learners' strategy use and its relationship to LA in two different educational systems. It is evident that the difference in teaching methods, learning tasks and achievement assessments would have an impact upon learners' strategy use and its relationship to LA.展开更多
基金Suppored by Postdoctral Fellowship Foundation of China
文摘Let Cnk denote the set of all t -subsets of an n -set. Assume A ∈ Cnk and B∈Cn.b (A,B) is called a cross-2-intersecting family if |A∩B|≥2 for any A∈A, B∈B.In this paper, the best upper bounds of the cardinalities for non-empty cross-2-intersecting families of a- and i- subsets are obtained for some n and b . A new proof for a Frankl-Tokushige theorem [6] is also given.
基金Project supported by the National Natural Science Foundation of China (No.10271084)the Natural Science Foundation for Young Scholars of Sichuan Province of China (No.07JQ0094)
文摘The global solution for a coupled nonlinear Klein-Gordon system in two- dimensional space was studied. First, a sharp threshold of blowup and global existence for the system was obtained by constructing a type of cross-constrained variational problem and establishing so-called cross-invariant manifolds of the evolution flow. Then the result of how small the initial data for which the solution exists globally was proved by using the scaling argument.
基金Supported by the National Natural Science Foundation of China(No.60830001)Program for New Century Excellent Talents in University(No.NCET-09-0206)+2 种基金the Key Project of State Key Lab.of Rail Traffic Control and Safety(No.RCS2008ZZ006)Program for Changjiang Scholars and Innovative Research Team in University(No.IRT0949)the Project of State Key Lab.of Rail Traffic Control and Safety(No.RCS2008ZT005)
文摘Communication based train control systems （CBTC） must work even in the worst situation-- train crossing. This paper models the propagation characteristics in one of the most common and piv- otal scenarios--train crossing in subway tunnels which is rarely mentioned in previous publications. Firstly, measurements for train crossing scenario at 2.4 GHz in a real subway line in Madrid have been made. The field measurement is the most reliable way to reveal the propagation characteristics involving shadowing effect and fast fading. Moreover, to precisely describe the fast fading distribu- tion and eliminate the inevitable weak points of traditional fitting way, a best numerical approxima- tion method using Legendre orthogonal polynomials has been proposed. Comparisons show that this method works better and is of greater physical significance. Finally, a complete statistical model is given and all the coefficients can be applied by system designers for the link and system level simu- lations.
文摘Nowadays, cross-cultural study is turning to pragmatic fields concerning communication, such as business negotiation,overseas life and language teaching, etc. This paper reviews previous studies of culture and communication, attempting to reveal how to have affective communication from perspective of cultural context by case studies. As a result, theoretical foundation and case studies prove that although we have cooperative principles as general guidelines for communication, cultural awareness, especially awareness of High Context(HC) and Low Context(LC), still plays a key role in cross-cultural communication by making up for the lost of meaning while transmission.
文摘CD4^(+)T cells can"help"or"license" conventional type 1 dendritic cells(cDC1s)to induce CD8^(+)cytotoxic T lymphocyte(CTL)anticancer responses,as proven in mouse models.We recently identified cDC1s with a transcriptomic imprint of CD4^(+)T-cell help,specifically in T-cell-infiltrated human cancers,and these cells were associated with a good prognosis and response to PD-1-targeting immunotherapy.Here,we delineate the mechanism of cDC1 licensing by CD4^(+)T cells in humans.Activated CD4^(+)T cells produce IFNβvia the STING pathway,which promotes MHC-I antigen(cross-)presentation by cDC1s and thereby improves their ability to induce CTL anticancer responses.In cooperation with CD40 ligand(L),IFNβalso optimizes the costimulatory and other functions of cDC1s required for CTL response induction.IFN-I-producing CD4^(+)T cells are present in diverse T-cell-infiltrated cancers and likely deliver“help”signals to CTLs locally,according to their transcriptomic profile and colocalization with“helped/licensed”cDCs and tumor-reactive CD8^(+)T cells.In agreement with this scenario,the presence of IFN-I-producing CD4^(+)T cells in the TME is associated with overall survival and the response to PD-1 checkpoint blockade in cancer patients.
文摘This study explored the relationship between LLS and LA in two different cultural contexts. The findings revealed that the differences between Australian and Chinese university students tend to lie more in their language proficiency levels than in cultural factors. This study also compares learners' strategy use and its relationship to LA in two different educational systems. It is evident that the difference in teaching methods, learning tasks and achievement assessments would have an impact upon learners' strategy use and its relationship to LA.
