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2003-2018 全部
为您找到包含“Fundamental Research Funds for the Central Universities”的内容共217

CHEN Tao,ZHANG Zhongming

In this study, we established a system in which host plants, bacterial pathogens, and symbiont rhizobia are included to study the role of innate immunity during symbiotic interactions. A pathogenic bacterium, Pseudomonas syringae pv. Tomato strain DC3000 (Pst DC3000) was found to cause chlorosis on leaves of Medicago truncatula A17. It was found that Sinorhizobium meliloti Sm2011 strain (Sm2011) and Pst DC3000 strain induce similar defense responses in M. truncatula, and symbiotic bacterium S. meliloti Sm2011 specific suppressed the defense responses that induced by pathogen of Pst DC3000. Inoculation with S. meliloti Sm2011 suppresses the transcription of defense-related genes including receptor of bacterial flagellin (FLS2), pathogenesis-related protein 10 (PR10) and transcription factors WRKY33 triggered by Pst DC3000 infection. Interestingly, treatment with Pst DC3000 was shown to specially inhibit the expression of symbiosis marker genes nodule inception (NIN) and nodulation pectate lyase (NPL) and to reduce the infection threads and nodules numbers on M. truncatula A17 roots, indicated that Pst DC3000 inhibits the establishment of symbiosis in M. truncatula. In addition, defense-related genes, such as MAPK3/6, RbohC and WRKY33 exhibit a transient increase in their expressions in the early stage of symbiosis, but drop down to normal level during symbiotic nitrogen fixation with strain S. meliloti Sm2011. Our data suggest that plant innate immunity plays an antagonistic role with symbiosis by directly inhibiting the formation of infection thread and nodule numbers.

2016-11-17

Fundamental Research Funds for the Central Universities (Program No: 2013QC041)

Huazhong Agricultural University,College of Plant Science and Technology, Wuhan, 430070,Huazhong Agricultural University, ,College of Life Science and Technology, Wuhan, 430070

#Biology#

0评论(0 分享(0)

Zhu Huazhang,Huang Jianming

In this paper, a novel switchable filter which can alternate between low-pass filter (LPF) and band-pass filter (BPF) is proposed, based on the micro-electromechanical systems' (MEMS) capacitive-contact switch on coplanar waveguide (CPW) transmission line. The novel design is constructed using electromagnetic band-gap (EBG) structures and the combination between the MEMS switch and the coupled slot of CPW signal line. When the MEMS capacitive-contact switch stays with up-state, the EBG BPF is obtained with the resonant frequency of 15.9GHz and the bandpass frequency ranged from 2.5 to 28.3GHz. When the MEMS capacitive-contact switch is pulled down by DC bias voltage, an EBG LPF is yielded with 3dB cut-off frequency is 28.1GHz. The MEMS capacitive-contact switch is applied as the transformer between LPF and BPF using a cantilever beam.

2010-11-03

Fundamental Research Funds for the Central Universities (BUPT No. 2009RC0302

School of Electronic Engineering, Beijing University of Posts and Telecommunications,School of Electronic Engineering, Beijing University of Posts and Telecommunications

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

Zhou Yalin

The design and development of novel microelectromechanical systems' (MEMS) coplanar waveguide (CPW) transmission lines, using microshield and groove, are presented in the paper to operate between 5-60 GHz. The quasi-static capacitances of CPW are calculated using the conformal mapping technique to express the propagation properties, i.e., the characteristic impedance and effective permittivity. Simulation results have shown a considerable loss reduction to levels that compare favorably with the conventional CPW. These transmission lines can be widely used in the development of phase shifters, filters, and antennas, because of their advantages in loss reduction and improvement in the performance.

2010-11-23

Fundamental Research Funds for the Central Universities(BUPT No. 2009RC0302

School of Electronic Engineering,Beijing University of Posts and Telecommunications

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

Song Qing,Zhang Guanmao,Zhao Hai,Wang Qiong

In this paper, A novel raised-cosine structure with relative low index dielectric regions surface plasmon polaritons(SPPs) waveguide is proposed. In the waveguide, the raised-cosine structure is introduced to the waveguide's dielectric regions innovatively. Then the field distribution, the normalized mode area, the propagation length and the figures of merit are calculated at the telecom wavelength of =1550nm. The relationship between the waveguide's performance and the shape of waveguide's relative low index dielectric regions(RLIDRs) is also discussed. It is found that the proposed waveguide had the longer propagation length than the conventional rectangle RLIDRs SPPs waveguide and it also has a strong capability of the field confinement. Moreover, with the change of the roll factor of the RLIDRs, the proposed waveguide's performance doesn't change greatly, when the between 0.02 and 0.2, its performance almost has no change. That means the machining error has a negligible impact on the waveguide's performance and it will have a greater potential in the application. All the simulations in this paper were performed by using rigorous numerical schemes based on finite-element method (FEM).

2015-04-16

Fundamental Research Funds for the Central Universities (lzujbky-2012-40

School of Information Science and Engineering, Lanzhou University, Lanzhou 730000,School of Information Science and Engineering, Lanzhou University, Lanzhou 730000,School of Information Science and Engineering, Lanzhou University, Lanzhou 730000,School of Information Science and Engineering, Lanzhou University, Lanzhou 730000

#Electrics, Communication and Autocontrol Technology#

0评论(0 分享(0)

Xiaolan CHEN,Ya-bo ZHU,Zheng XING,Guoxia TANG,Zhengyuan WANG

PbSe nanostructures have been synthesized successfully with different sizes and morphologies in five different systems, molten composite salt medium system, solid state medium system, pure hydrazine liquid system, hydroxide-aid hydrazine liquid system and composite salt plus hydroxide system. Particles with size of only 60nm on average were obtained in solid state medium. The growth mechanism of these PbSe nanostructures in each system and the important factors affecting the morphology and size were discussed. Results show that the size of PbSe nanostructures directly depends on the state of medium and the reacting environment plays a key part in guiding certain direction of the growth of crystals.

2015-05-11

Fundamental Research Funds for the Central Universities (Grant No. 2013XK07

School of Material Science and Engineering, China University of Mining and Technology, Xuzhou 221116,School of Material Science and Engineering, China University of Mining and Technology, Xuzhou 221116,School of Material Science and Engineering, China University of Mining and Technology, Xuzhou 221116,School of Material Science and Engineering, China University of Mining and Technology, Xuzhou 221116,School of Material Science and Engineering, China University of Mining and Technology, Xuzhou 221116

#Materials Science#

1评论(0 分享(0)

HUANG Ye-Hui

Degasperis-Procesi equation with self-consistent sources is an integrable extension of the original system. By using a reciprocal transformation, we obtain the multi-soliton solutions of the Degasperis-Procesi equation with self-consistent sources by using the reciprocal transformation and the Darboux transformation.

2013-09-06

Fundamental Research Funds for the Central Universities (13QN37

Department of Mathematics and Physics, North China Electric Power University, Beijing 102206

#Mathematics#

0评论(0 分享(0)

Pan Feng,Yang xu

The emergence of mobile and ubiquitous technologies have completely reshaped the area of education in recent years. Mobile devices can be used to promote learning anywhere and anytime, to foster lifelong learning and knowledge sharing, or to promote building a learning society. This paper is to describe the basic elements of ubiquitous learning based on the developing technology and to design an effective ubiquitous learning mode which can utilize the technology of ubiquitous computing and information and communication to make a productive learning process. Then a typical ubiquitous learning mode is given. The paper might be useful for anyone interested in designing, preparing and implementing a ubiquitous learning system.

2012-12-18

the Fundamental Research Funds for the Central Universities(No. 2011RC1010

School of Economics and Management, Beijing University of Posts and Telecommunications, Beijing 100876,School of Economics and Management,Beijing University of Posts and Telecommunications, Beijing 100876

#Education#

0评论(0 分享(0)

CHEN Hang,WANG Xianfeng

The second eigenvalue of the Jacobi operator$J_s$ of the hypersurfaces with constant scalar curvaturein a spherewas studied by Li-Wang. Later, Chen-Wang further studied thesecond eigenvalue of the Jacobi operator $J_w$ associated to the volume-preserving variational problem for linear Weingarten hypersurfaces in a sphere. The condition ``$ngeq5$" was assumed in their theorems. In this paper, a sharp estimate involving a compact submanifold in a real space form with $H_2>0$ is proved, this inequality shows that the assumption ``$ngeq 5$" in the theorems proved by Li-Wang and Chen-Wang can be improved to be``$ngeq 4$".

2016-01-11

the Fundamental Research Funds for the Central Universities (Grant No. 3102014JCQ01071

SRFDP (Grant No. 20120031120026

NSFC (Grant Nos. 11201243 and 11571185

Department of Applied Mathematics, Northwestern Polytechnical University, Xi\' an 710072 ,School of Mathematical Sciences,Nankai University,Tianjin 300071

#Mathematics#

0评论(0 分享(0)

CHEN Hang,WANG Xianfeng

In this paper, the eigenvalue estimate for an elliptic operator of submanifolds in space forms is investigated, this ellipticoperator is a natural generalization of the $L_1$ operator on hypersurfaces of space forms to submanifolds of space forms. An upper bound estimate forthe second eigenvalue of this elliptic operator is obtained in this paper.

2016-01-11

SRFDP (Grant No. 20120031120026

NSFC (Grant Nos. 11201243 and 11571185

the Fundamental Research Funds for the Central Universities (Grant No. 3102014JCQ01071

Department of Applied Mathematics, Northwestern Polytechnical University, Xi\' an 710072 ,School of Mathematical Sciences,Nankai University,Tianjin 300071

#Mathematics#

0评论(0 分享(0)

Yang Qiaohua

In this paper we deal with the problem of Sobolev imbedding in thecritical cases on Carnot groups. We prove some Trudinger-type inequalities on the whole Carnot group, extending to this context the Euclidean results by T. Ozawa and the Heisenberg groups by the same author. The procedure depend also on optimal growth rate of Gagliardo-Nirenberg inequalities. We note the condition m>max{Q/q,1} in [1], Theorem 1.4, can be replaced by m>Q/q though a new inequality on G. Using these inequalities, we also obtain the Brezis-Gallouet-Wainger inequality on Carnot group.

2011-05-20

Fundamental Research Funds for the Central Universities under Grant (No. 1082001

School of Mathematics and Statistics, Wuhan University

#Mathematics#

0评论(0 分享(0)