19 resultados para Ecogeographical background
em Chinese Academy of Sciences Institutional Repositories Grid Portal
Resumo:
31491CNKNapHP;( 0~10 cm)Ca0( 20-30 cm40-50 cm);2;3CR-S;C-CNC-CR-SC-SR-SR-W-Bs-VBs-V-4C- SC-CNK; SSR-R-CR-SNaCa0pH550 mm (6 13C)( Artemisia scoparia)( Lespedeza davurica);(Stipabungeana)(Artemisia gmelinii)(Artemisia giraldii); ( Bothriochloa ischaemun)-26.890.66-26.240.48, -26.210.49, -26.861.09, -27.610.39-15 .811. 79;2.360.63%2.380.29%2.00.29%2.00.25%1.500.37% 1.240.19% 13C5 13C 13C; 13C 13C -19744%22%20%14%; 197104881028t.y-l104881028y-119995244051y-119995.3199914 %100059%;100041%1147.2234RMB.yr-146%27%14%13%
Resumo:
In this paper we describe an experiment on laser cooling of Rb-87 atoms directly from a vapor background in diffuse light. Diffuse light is produced in a ceramic integrating sphere by multiple scattering of two laser beams injected through multimode fibers. A probe beam, whose propagation direction is either horizontal or vertical, is used to detect cold atoms. We measured the absorption spectra of the cold atoms by scanning the frequency of the probe beam, and observed both the absorption signal and the time of flight signal after we switched off the cooling light, from which we estimated the temperature and the number of cold atoms. This method is clearly attractive for building a compact cold atom clock.
Resumo:
10 mtDNA D2loop 912 bp , , 9 ( B . indicus) ( B . taurus) , 6125 % , 01978 01054 , 01014 30 01008 68, , (90 %) , Brah26 , , () , , , ( B . indicus )
Resumo:
The penetrance of Leber's hereditary optic neuropathy (LHON) in families with primary mitochondrial DNA (mtDNA) mutations is very complex. Matrilineal and nuclear genetic background, as well as environmental factors, have been reported to be involved in d
Resumo:
GaN epilayers grown by molecular beam epitaxy using NH3 as the nitrogen source were found to contain hydrogen. We further notice that the background electron concentration in GaN can be correlated with the amount of hydrogen contaminant. X-ray photoelectron spectroscopy (XPS) measurements of the N Is peak reveal that hydrogen is bound to nitrogen. This will make the corresponding Ga atom see insufficient N counterpart, as can be inferred from the XPS Ga 3d spectrum. We then think that nitrogen in the lattice terminated by hydrogen is an effective nitrogen vacancy and hence a donor accounting for the background electrons.
Resumo:
An effective face detection system used for detecting multi pose frontal face in gray images is presented. Image preprocessing approaches are applied to reduce the influence of the complex illumination. Eye-analog pairing and improved multiple related template matching are used to glancing and accurate face detecting, respectively. To shorten the time cost of detecting process, we employ prejudge rules in checking candidate image segments before template matching. Test by our own face database with complicated illumination and background, the system has high calculation speed and illumination independency, and obtains good experimental results.
The Small Infrared Target Detection in Complicated Background Based on Adaptive Morphological Filter
Resumo:
A novel structure of MMI coupler with different background refractive index has been designed. With stronger optical confinement in multimode waveguides, more guided modes are excited to improve imaging quality. Two-dimensional finite difference beam propagation method (2-D FDBPM) was used to simulate this new structure and had proven that its imaging quality, in terms of power uniformity and excess loss, is much better than conventional structure. This structure can be applied in SOI rib waveguides by deep etching method.
Resumo:
Chinese Academy of Sciences [KZCX2-YW-315-2]; National Natural Science Foundation of China [40701021, 40625002]; National Key Technology R&D Program of China [2007BAC03A01]
Resumo:
In this paper, interfacial waves in three-layer stratified fluid with background current are investigated using a perturbation method, and the second-order asymptotic solutions of the velocity potentials and the second-order Stokes wave solutions of the associated elevations of the interfacial waves are presented based on the small amplitude wave theory, and the Kelvin-Helmholtz instability of interfacial waves is studied. As expected, for three-layer stratified fluid with background current, the first-order asymptotic solutions (linear wave solutions), dispersion relation and the second-order asymptotic solutions derived depend on not only the depths and densities of the three-layer fluid but also the background current of the fluids, and the second-order Stokes wave solutions of the associated elevations of the interfacial waves describe not only the second-order nonlinear wave-wave interactions between the interfacial waves but also the second-order nonlinear interactions between the interfacial waves and currents. It is also noted that the solutions obtained from the present work include the theoretical results derived by Chen et al (2005) as a special case. It also shows that with the given wave number k (real number) the interfacial waves may show Kelvin-Helmholtz instability.
