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排序方式: 共有55条查询结果,搜索用时 15 毫秒
1.
Direct Antisite Formation in Electron Irradiation of GaAs 总被引:1,自引:0,他引:1
2.
T. K. Ikäheimonen V. P. Vartti E. Ilus J. Mattila 《Journal of Radioanalytical and Nuclear Chemistry》2002,252(2):309-313
Liquid discharges of 99Tc from the Sellafield nuclear facilities increased largely in the mid 90"s. These releases are transported to the Nordic sea areas by the ocean currents. Results of the 99Tc activities along the Norwegian coastal areas and in the North Sea have been reported but then again, the spreading of 99Tc into Baltic Sea has not been studied thoroughly. Fucus vesiculosus and seawater samples were collected in the summer 1999 from the Finnish coastal areas for measuring 99Tc in the Baltic Sea area. A modified analytical method for measuring 99Tc in the environmental samples was developed at that time. The method based on extraction chromatography and liquid scintillation measurement of 99Tc. The 99Tc concentration in the Fucus vesiculosus in the Finnish coast of the Baltic Sea varied from 1.6 to 11.6 Bq/kg (dry weight) being highest at the most northern sampling sites. These values were considerable lower than those in the Danish and Norwegian coasts. The variation in the concentrations observed are probably due to biological factors. The 99Tc concentration in the Baltic Sea water studied was below 0.2 Bq/m3. 相似文献
3.
Tandem mass spectrometric analysis of S‐ and N‐linked glutathione conjugates of pulegone and menthofuran and identification of P450 enzymes mediating their formation 下载免费PDF全文
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5.
Kirsti Mattila 《Journal of Mathematical Analysis and Applications》2003,287(2):494-503
For operators T with the property which in addition satisfy a spectral condition we consider conditions under which the restriction of T to a closed invariant subspace also satisfies the same inclusion on the subspace. 相似文献
6.
Abstract Scanning probe microscopy experiments show that ion irradiation of (0001) graphite results in the formation of isolated defects comprising of a few tens of atoms. We use molecular dynamics simulations and density-functional theory calculations to study the formation probabilities of these defects. We identify different defect structures which correspond to experimentally observed hillocks on graphite surfaces. We find that the predominant source of defects are vacancies and interlayer interstitials, and identify a three-atom carbon ring defect on the graphite surface. 相似文献
7.
We introduce a mass‐flux‐based inlet boundary condition for the lattice‐Boltzmann method. The proposed boundary condition requires minimal amount of boundary data, it produces a steady‐state velocity field which is accurate close to the inlet even for arbitrary inlet geometries, and yet it is simple to implement. We demonstrate its capability for both simple and complex inlet geometries by numerical experiments. For simple inlet geometries, we show that the boundary condition provides very accurate inlet velocities when Re?1. Even with moderate Reynolds number, the inlet velocities are accurate for practical purposes. Furthermore, the potential of our boundary condition to produce inlet velocities which convincingly adapt to complex inlet geometries is highlighted with two specific examples. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
8.
Jarmo Lohilahti Herkko Mattila Filip Paw?owski 《Journal of Molecular Spectroscopy》2005,234(2):279-285
The ground state spectrum of the formaldehyde D213CO molecule in the range from 25 to 360 cm−1 has been recorded by a Fourier transform infrared spectrometer. The quantum number limits of the assigned transitions are J = 6-54 and Ka = 0-16. The data was fitted into Watson’s A- and S-reduced Hamiltonians in Ir-representation up to eighth order. The determinable constants calculated from both reductions are compared. The standard deviation of the far infrared data is 3.0 MHz. The spectroscopic constants are also calculated to high accuracy at the CCSD(T)/cc-pVQZ level of ab initio theory and agree well with the experimental ones. 相似文献
9.
The Extragalactic Background Light (EBL) stands for the mean surface brightness of the sky as we would see it from a representative vantage point in the intergalactic space outside of our Milky Way Galaxy. Averaged over the whole 4π solid angle it represents the collective light from all luminous matter radiated throughout the cosmic history. Part of the EBL is resolved into galaxies that, with the increasing detecting power of giant telescopes and sensitive detectors, are seen to deeper and deeper limiting magnitudes. This resolved part is now known to contribute a substantial or even the major part of the EBL. There still remains, however, the challenge of finding out to what extent galaxies too faint or too diffuse to be discerned individually, individual stars or emission by gas outside the galaxies, or – more speculatively – some hitherto unknown light sources such as decaying elementary particles are accounting for the remaining EBL. We review the recent progress that has been made in the measurement of EBL. The current photometric results suggest that there is, beyond the resolved galaxies, an EBL component that cannot be explained by diffuse galaxy halos or intergalactic stars. 相似文献
10.
Isoelectric focusing in immobilized pH gradients, supplemented with 0.5% w/v carrier ampholytes was applied for studies of native proteins, especially immunoglobulin G, in cerebrospinal fluid and serum. All 72 paired samples were run on pH 4-10 gels; 25 of them were also examined in pH 7-10 gels. Silver staining and nitrocellulose blotting with amplified immunoperoxidase detection of immunoglobulin G were used for protein visualization. Intrathecally produced immunoglobulin G was resolved into sharply focused, straight and easily identifiable fractions. The pH gradients were stable and the inter-gel reproducibilities of individual immunoglobulin G patterns were good. 相似文献