中国科学院机构知识库网格系统: 检索

Resolving the genetic paradox of invasions: Preadapted genomes and postintroduction hybridization of bigheaded carps in the Mississippi River Basin 期刊论文 OAI收割
EVOLUTIONARY APPLICATIONS, 2019, 页码: 15
作者: Wang, Jun; Gaughan, Sarah; Lamer, James T.; Deng, Cao; Hu, Wanting

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收藏 | 浏览/下载：37/0 | 提交时间：2019/10/17

bigheaded carps or Asian carp cross experiment genetic paradox of invasions genome sequencing interspecific hybridization

WEAK CROSSABILITY BARRIER BUT STRONG JUVENILE SELECTION SUPPORTS ECOLOGICAL SPECIATION OF THE HYBRID PINE PINUS DENSATA ON THE TIBETAN PLATEAU 期刊论文 OAI收割
EVOLUTION, 2014, 卷号: 68, 期号: 11, 页码: 3120-3133
作者: Zhao, Wei; Meng, Jingxiang; Wang, Baosheng; Zhang, Lisha; Xu, Yulan

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收藏 | 浏览/下载：11/0 | 提交时间：2023/03/30

Cross-compatibility ecological selection hybrid speciation local adaptation population divergence transplantation experiment

Aerodynamic design on China new high-speed trains 会议论文 OAI收割
1st International Workshop on High-Speed and Intercity Railways, IWHIR 2011, Shenzhen, Hong Kong, China, JULY 19-22, 2011
作者: Yang GW(杨国伟); Yang GW(杨国伟)

收藏 | 浏览/下载：34/0 | 提交时间：2013/02/06

Railroad cars Railroad transportation Railroad tunnels Railroads Wind effects Aerodynamic designs Aerodynamic noise Aerodynamic performance Cross-wind effects High speed trains Pressure waves Running conditions Running tests Running-in Wind tunnel experiment

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：35/0 | 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.

Study on sensing properties of a temperature-independent high pressure sensor base on tapered FBG (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photonics and Optoelectronics, SOPO 2010, June 19, 2010 - June 21, 2010, Chengdu, China
作者: Liu Y.; Zhang Y.; Zhang X.; Zhang X.; Zhang X.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

The sensing properties with strain and temperature of tapered FBG had been researched both theoretically and experimentally. Based on tapered FBG and thin-wall strain cylinder structure a novel temperature-independent high pressure sensor was fabricated and investigated. The tapered FBG performed as a chirped grating whose bandwidth and reflection power broadened and increased when the pressure applied on it. Moreover the bandwidth and the reflection power were temperature-independent. So the value of the strain can be obtained by detecting the reflection power. This method effectively solved the cross-sensitivity problem. The experiment results indicated that this sensor provided a measurement range of 040MPa with a sensitivity of 0.04w/MPa low cost and good application prospect. 2010 IEEE.

A real-time two-dimensional correlation speed measurement based on image (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
作者: Yu L.

收藏 | 浏览/下载：20/0 | 提交时间：2013/03/25

In order to implement two-dimensional moving object's non-contact and real-time speed measurement in this paper wc proposed a new method which was based on the characteristic of FPGA and a real-time two-dimensional correlation speed measurement was proposed on image processing using high speed CMOS shown in figure 1. Experimental installation was shown in figure 2 a cardboard with images which was fixed in electric control movement device was moving to simulate moving object the CMOS image sensor gathered image signals of the cardboard and the image signals was output to FPGA after a serials pretreatment such as binaryzation etc. Logical operation insteaded mathematical operation on FPGA to implement two frames image's cross-correlation operations as the formula (10) in this paper and finally calculate the two-dimensional velocity. Through experiment result of table 1 we drawn an conclusion the accurarcy of the method in this paper was less than 1 pixel and the method can be used at a certain speed ranges of two-dimensional real-time speed measurement. 2010 IEEE.

V-0 production in p plus A collisions at root s=41.6 GeV 期刊论文 OAI收割
EUROPEAN PHYSICAL JOURNAL C, 2009, 卷号: 61, 期号: 2, 页码: 207-221
作者: HERA-B Collaboration

收藏 | 浏览/下载：27/0 | 提交时间：2015/12/02

STRANGE-PARTICLE-PRODUCTION PROTON-PROTON COLLISIONS HERA-B EXPERIMENT PRODUCTION CROSS-SECTIONS 205 GEV-C INCLUSIVE PRODUCTION TRANSVERSE-MOMENTUM NUCLEUS COLLISIONS LAMBDA PRODUCTION 300-GEV PROTONS

Study of resonance formation in the mass region 1400-1500 MeV through the reaction gamma gamma -> K-S(0) K-+/-pi(-/+) 期刊论文 OAI收割
JOURNAL OF HIGH ENERGY PHYSICS, 2007, 期号: 3
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收藏 | 浏览/下载：22/0 | 提交时间：2015/12/02

MONTE-CARLO GENERATOR GAMMA-GAMMA L3 EXPERIMENT QUANTUM CHROMODYNAMICS 2-PHOTON COLLISIONS SPIN-1 RESONANCE CROSS-SECTIONS DETECTOR LEP PHYSICS

Analysis of the pi(+) pi(-) pi(+)pi(-) and pi(+)pi(0) pi(-) pi(0) final states in quasi-real two-photon collisions at LEP 期刊论文 OAI收割
PHYSICS LETTERS B, 2006, 卷号: 638, 期号: 2--3, 页码: 128-139
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收藏 | 浏览/下载：23/0 | 提交时间：2015/12/02

GAMMA-GAMMA-REACTIONS L3 EXPERIMENT Q2QBAR2 MESONS VECTOR-DOMINANCE 4-QUARK STATES CROSS-SECTION DETECTOR SEARCH GAMMA-GAMMA->RHO+RHO SCATTERING

Measurement of hadron and lepton-pair production in e(+)e(-) collisions at root s=192-208 GeV at LEP 期刊论文 OAI收割
EUROPEAN PHYSICAL JOURNAL C, 2006, 卷号: 47, 期号: 1, 页码: 1-19
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收藏 | 浏览/下载：25/0 | 提交时间：2015/12/02

CARLO EVENT GENERATOR FORWARD-BACKWARD ASYMMETRIES ANGLE BHABHA SCATTERING MONTE-CARLO CROSS-SECTIONS E+E-ANNIHILATION STANDARD MODEL L3 EXPERIMENT FINAL-STATES Z-PEAK