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target gas
The absolute intensity of several spectral lines has been measured as a function of time at different target gas pressures.
      
After scattering, the population ratio nf/ni is measured as a function of the target gas pressure PT.
      
Thus the number of wall collisions of the atoms in the target gas is important for modeling the processes of spin relaxation and recombination.
      
By superimposing sequential schlieren images, we obtained information about the laser propagation and found that the ionization front propagated farther with decreasing density of the target gas.
      
An indispensable prerequisite of the reliability of such measurements is, however, a check of the equivalence of the ionization yield produced in a specified target gas and the yield to be expected in liquid water or biological material.
      
It is demonstrated that these techniques result in low backgrounds due to scattering from species other than the polarized target gas and allow for fast and flexible orientation of the target spin.
      
The application of this hyperfine probe and deorientation effects during recoil in the target gas and in vacuo are discussed.
      
When adding up to 15% Xe to the He target gas, a near-exponential loss of alignment with the Xe partial pressure was observed.
      
Collisional rate constants were determined from time spectra for various target gas pressures.
      
With the use of an admixture of He to the target gas normalisation was performed by comparison to known single ionisation cross sections for He.
      
For the production of [11C]-CH4 in good yield a target gas holder for high pressures has been developed.
      
This target gas holder was filled with 5% H2 in N2 at 3×106 Pa.
      
Enriched target material yields were calculated from measurements based on experiments performed with non-enriched target gas.
      
The yield at a beam current of 10 μA and a flow rate of 750 ml min-1 was about 110 MBq ml-1 target gas or 93 MBq ml-1 H2O at steady state.
      
The change in efficiency of CID as the target gas is changed is in general agreement with previous CID studies of other systems: the cross section with Ar is ~0.5 that with Xe, and no product ions are found with He.
      
A radiative divertor is proposed as a possible scenario, utilizing a hydrogen target gas to disperse the plasma momentum and trace impurity radiation to dissipate the plasma heat flux.
      
Films at all NiO molar concentrations in the 10% NiO - 40% range showed an optical response to the target gas, while only 30% and 40% NiO films provided a detectable gas induced resistance change.
      
After passing through the skimmer, lens 2 L2 focuses the electron beam onto the target gas beam.
      
Depending on their origin the superimposed fringe structure can be narrower, comparable or much broader than the spectral feature of the target gas.
      
Emission of the target gas from the soil into the chamber results in increases in the concentration of the gas in the chamber.
      
 

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