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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

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)

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)

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)

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)

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)

崔秋,魏芳

2011-11-14

相比目前主流的图片格式JPEG来说,JPEG2000在压缩效率和码流可伸缩性方面都有明显的优势,被业界公认为下一代静态图像压缩标准,数字影院倡导组织(DCI,Digital Cinema Initiatives)已将其作为数字电影的图像格式。但是由于其编码过程,特别是EBCOT(Embedded Block Coding with Optimized Truncation)部分,算法复杂度较大,制约了它在实时性要求较高的系统中的应用。随着图形处理器(GPU)的发展,使用GPU辅助CPU进行大数据量运算已经成为可能。NVIDIA公司2006年正式发布计算统一设备架构(CUDA),采用SIMT的模式,使GPU用于通用计算更加容易和有效。在本文中,我们设计了一种新的基于CUDA的并行EBCOT位平面编码算法,测试结果显示,相比传统的CPU串行编码,有3-4倍的加速比。

The Fundamental Research Funds for the Central Universities(2009RC0131

北京邮电大学信息与通信工程学院,北京 100876,北京邮电大学信息与通信工程学院,北京 100876

#计算机科学技术#

0评论(0 分享(0)

YIN Huadong,WEN Qiaoyan

In the current cloud computing environment, as it's not reliable between user and cloud computing service provider, the real-time data in the cloud must be proactively monitored, defensive and detected. This work tries to show intrusion detection techniques using the study of natural human immune system, and offers an immune-based intrusion detection system framework for cloud computing environment which is configurable, scalable and efficient.

2011-11-29

NSFC(Grant Nos. 61170270,61100203,60873191

the Fundamental Research Funds for the Central Universities( 60903152

The State Key Laboratory of Networking and Switching,BeijingUniversity of Posts and Telecommunications, Beijing 100876,The State Key Laboratory of Networking and Switching,BeijingUniversity of Posts and Telecommunications, Beijing 100876

#Computer Science and Technology#

0评论(0 分享(0)

Tu Chenghou,Huang Zhangchao ,Lou Kai,Liu Hongjun,Wang Yishan,Li Yongnan,Lv Fuyun ,Wang Huitian

We have demonstrated an ultrashort, compact green light radiation by frequency doubling of an all-fiber ytterbium-doped fiber laser source in a PPKTP waveguide fabricated by femtosecond laser pulses. Using the fabricated PPKTP waveguide crystal containing a 10 mm single grating with a period of 9.0 μm, we generate 310 mW of picosecond radiation at 532 nm for a fundamental power of 1.6W, corresponding to a conversion efficiency of 19.3%. The temperature tuning range of 8℃ is achieved for a fixed fundamental wavelength of 1064 nm, the FWHM of the wavelength tuning curve is 4.2 nm at room temperature. The generated ultrashort pulses at 532 nm are of great importance and have comprehensive applications in photobiology research and high-resolution spectroscopy.

2012-02-07

The Fundamental Research Funds for the Central Universities of China(Z1a2024916)

School of Physics, Nankai University, Tianjin 300071, China,School of Physics, Nankai University, Tianjin 300071, China,School of Physics, Nankai University, Tianjin 300071, China,State Key Laboratory of Transient Optics and Photonics Technology, Xi’an Institute of Optics and PrecisionMechanics, Chinese Academy of Sciences, Xi’an, 710119, China,State Key Laboratory of Transient Optics and Photonics Technology, Xi’an Institute of Optics and PrecisionMechanics, Chinese Academy of Sciences, Xi’an, 710119, China,School of Physics, Nankai University, Tianjin 300071, China,School of Physics, Nankai University, Tianjin 300071, China,School of Physics, Nankai University, Tianjin 300071, China

#Physics#

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)