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	Homology roses and the D(2)-problem 期刊论文 OAI收割 SCIENCE CHINA-MATHEMATICS, 2015, 卷号: 58, 期号: 8, 页码: 1753-1770 作者: Jin XiFeng; Su Yang; Yu Li \| 收藏 \| 浏览/下载：26/0 \| 提交时间：2018/07/30 homology rose deficiency group cohomology Carlsson conjecture D(2)-problem gap efficiency Cockcroft property
	The design problems of one kind of chaotic one-way hash function (EI CONFERENCE) 会议论文 OAI收割 2012 4th International Conference on Multimedia and Security, MINES 2012, November 2, 2012 - November 4, 2012, Nanjing, Jiangsu, China Li P.; Zhang M.; Shi J. 收藏 \| 浏览/下载：22/0 \| 提交时间：2013/03/25 The construction method of one kind of one-way hash function based on 1-D Logistic map is analyzed. The design problem and some collision problems are pointed out. By using the dictionary attack the collision probability of the arithmetic realized with signal floating point numbers is 2-23 and the collision probability of the arithmetic realized with double floating point numbers is 2-55. The reasons for these design problems are discussed and some key problems are pointed out which should be taken care of while constructing one-way hash function based on a digital chaotic map. 2012 IEEE.
	Study on spectrograph for ionosphere: A broadband imaging instrument prototype for far-ultraviolet (EI CONFERENCE) 会议论文 OAI收割 International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China 作者: Wang S.-R.; Lin G.-Y.; Yu L. 收藏 \| 浏览/下载：36/0 \| 提交时间：2013/03/25 Current research on space-based exploration for the ionosphere needs more advanced technologies. Because the spectral signals in the ionosphere distributing basically in the far-ultraviolet waveband are very weak. Usual spectrometer structures and detectors such as CCD can't receive enough information. Based on this principle of atmospheric sounding the imaging spectrometer prototype for ionosphere detection application was designed to solve the problem. This prototype consists of the telescope and the imaging spectrometer. The simple structure and small number of mirrors can help higher transmission efficiency be achieved and weak signals detection be implemented. The telescope is an off-axis parabolic mirror and the spectrometer is a modified Czerny-Turner spectral imaging system. Modified Czerny-Turner spectrometer contains a spherical mirror a fixed plane grating and a toroidal mirror. By adjusting the incident angle to the collimating mirror and using toroidal mirror coma and astigmatism were corrected well. We also optimize distances between the grating to the focusing mirror and the focusing mirror to the image plane to improve disadvantages of traditional Czerny-Turner structure. Designed results demonstrate that aberrations are substantially corrected and high image quality can be obtained in broad waveband. The photon counting Wedge-Strip-Anode detector with micro-channel planes as the receiving plane is accepted for the instrument prototype. The other photon counting 2-D detector responding well for weak light such as Cross-Delay line detector and MAMA detector can also be used for detection. The calibration and performances testing system is made of a vacuum system a deuterium lamp a monochrometer and the instrument prototype. Results obtained from the experiment show that the spectral resolution is 2.4 nm and the spatial resolution is 80 m. The other calibration experiments are running. The technology of the spectrometer prototype is important for the research and applications of ionosphere remote sensing. 2011 SPIE.
	THE TWO-DIMENSIONAL RIEMANN PROBLEM FOR ISENTROPIC CHAPLYGIN GAS DYNAMIC SYSTEM 期刊论文 OAI收割 COMMUNICATIONS ON PURE AND APPLIED ANALYSIS, 2010, 卷号: 9, 期号: 2, 页码: 431-458 作者: Guo, Lihui; Sheng, Wancheng; Zhang, Tong \| 收藏 \| 浏览/下载：18/0 \| 提交时间：2018/07/30 2-D Riemann problem Chaplygin gas full linear degenerate delta wave
	1D-KBA microscope using double-periodic multilayer (EI CONFERENCE) 会议论文 OAI收割 Advances in X-Ray/EUV Optics and Components IV, August 3, 2009 - August 5, 2009, San Diego, CA, United states 作者: Wang Z.; Wang X.; Wang X.; Wang X.; Wang Z. 收藏 \| 浏览/下载：12/0 \| 提交时间：2013/03/25 To study the action of shock wave in CH target one-dimensional grazing incidence KBA microscope for 4.75keV energy was set up. Because of strong absorption in air 4.75keV energy microscope can just work in vacuum. Accordingly the alignment and assemblage will be very complicated and difficult. A special multilayer method using double periodic multilayer was proposed to solve this problem. This multilayer has high reflectivity not only for 4.75keV X-rays but also for 8keV X-rays at the same grazing incidence angle. It means 1D-KBA microscope has the same light trace for different working energies. Therefore we can implement the alignment and assembly of 4.75keV system by the help of 8keV X-rays. Because 8keV X-rays is very easy produced by X-ray tube and has strong transmittability in air the alignment and assemblage process became relatively easy. By now we have finished the alignment experiment at 8keV and obtained imaging results. The performance is about 2-3m resolution in 250m field of view. It is coincide with the calculation. 2009 SPIE.
	Optimal HP configurations of proteins by combining local search with elastic net algorithm 期刊论文 OAI收割 JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS, 2007, 卷号: 70, 期号: 3, 页码: 335-340 作者: Guo, Yu-Zhen; Feng, En-Min; Wang, Yong \| 收藏 \| 浏览/下载：20/0 \| 提交时间：2018/07/30 protein folding problem 2D HP lattice model elastic net algorithm local search method
	On the 2-D Riemann problem for the compressible Euler equations II. Interaction of contact discontinuities 期刊论文 OAI收割 DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS, 2000, 卷号: 6, 期号: 2, 页码: 419-430 作者: Chang, T; Chen, GQ; Yang, SL \| 收藏 \| 浏览/下载：20/0 \| 提交时间：2018/07/30 2-D Riemann problem Euler equations transonic flow contact discontinuities shock waves rarefaction waves vortices interaction of waves upwind averaging schemes
	Two-dimensional Riemann problems of simplified Euler equation 期刊论文 OAI收割 CHINESE SCIENCE BULLETIN, 1998, 卷号: 43, 期号: 6, 页码: 441-444 作者: Yang, XZ; Huang, FM \| 收藏 \| 浏览/下载：17/0 \| 提交时间：2018/07/30 2-D Riemann problem implicit functions cylindrical surface pencil of cylindrical surface