Multidirectional Doppler pumping: A new method to prepare an atomic beam having a large fraction of excited atoms

1975 ◽  
Vol 26 (6) ◽  
pp. 347-349 ◽  
Author(s):  
H. J. Gerritsen ◽  
G. Nienhuis
Keyword(s):  
Atomic Beam ◽  
Large Fraction ◽  
New Method ◽  
Excited Atoms

A new method for the investigation of the angular distribution of photoelectrons from laser-aligned core-excited atoms

1995 ◽  
Vol 75 ◽  
pp. 61-65 ◽  
Author(s):  
M. Wedowski ◽  
K. Godehusen ◽  
F. Weisbarth ◽  
P. Zimmermann ◽  
Th. Dohrmann ◽  
...  
Keyword(s):  
Angular Distribution ◽  
New Method ◽  
Excited Atoms

scholarly journals Ensemble Postprocessing of Daily Precipitation Sums over Complex Terrain Using Censored High-Resolution Standardized Anomalies

2017 ◽  
Vol 145 (3) ◽  
pp. 955-969 ◽  
Author(s):  
Reto Stauffer ◽  
Nikolaus Umlauf ◽  
Jakob W. Messner ◽  
Georg J. Mayr ◽  
Achim Zeileis
Keyword(s):  
Daily Precipitation ◽  
Scale Effects ◽  
Large Fraction ◽  
New Method ◽  
Ensemble Prediction ◽  
Small Scale ◽  
Response Distribution ◽  
Ensemble Forecasts ◽  
Probabilistic Forecasts ◽  
Scale Properties

Probabilistic forecasts provided by numerical ensemble prediction systems have systematic errors and are typically underdispersive. This is especially true over complex topography with extensive terrain-induced small-scale effects, which cannot be resolved by the ensemble system. To alleviate these errors, statistical postprocessing methods are often applied to calibrate the forecasts. This article presents a new full-distributional spatial postprocessing method for daily precipitation sums based on the standardized anomaly model output statistics (SAMOS) approach. Observations and forecasts are transformed into standardized anomalies by subtracting the long-term climatological mean and dividing by the climatological standard deviation. This removes all site-specific characteristics from the data and makes it possible to fit one single regression model for all stations at once. As the model does not depend on the station locations, it directly allows the creation of probabilistic forecasts for any arbitrary location. SAMOS uses a left-censored power-transformed logistic response distribution to account for the large fraction of zero observations (dry days), the limitation to nonnegative values, and the positive skewness of the data. ECMWF reforecasts are used for model training and to correct the ECMWF ensemble forecasts with the big advantage that SAMOS does not require an extensive archive of past ensemble forecasts as only the most recent four reforecasts are needed, and it automatically adapts to changes in the ECMWF ensemble model. The application of the new method to the central Alps shows that the new method is able to depict the small-scale properties and returns accurate fully probabilistic spatial forecasts.

The nuclear magnetic dipole moments of the stable isotopes of europium and the hyperfine structure anomaly

1960 ◽  
Vol 257 (1289) ◽  
pp. 277-282 ◽  
Keyword(s):  
Stable Isotopes ◽  
Dipole Moment ◽  
Hyperfine Structure ◽  
Magnetic Dipole ◽  
Atomic Beam ◽  
Magnetic Dipole Moment ◽  
Dipole Moments ◽  
New Method ◽  
Hyperfine Structures ◽  
Nuclear Magnetic

The nuclear magnetic dipole moment of 151 Eu and the ratio of the moments of 151 Eu and 153 Eu have been measured by the new method of resonance in three loops in a short atomic beam. The results are: μ ( 151 Eu) = 3·419 ± 0·004 n.m.; μ ( 151 Eu) / μ ( 153 Eu)= 2·2686 ± 0·0015. The result, taken together with the ratio of the hyperfine structures of europium, gives a hyperfine structure anomaly of (1·0 + 0·23)%. A theoretical value of the anomaly is estimated.

Absolute measurement of photoionization cross sections of excited atoms: Application to determination of atomic beam densities

1988 ◽  
Vol 38 (11) ◽  
pp. 5949-5952 ◽  
Author(s):  
C. E. Burkhardt ◽  
J. L. Libbert ◽  
Jian Xu ◽  
J. J. Leventhal ◽  
J. D. Kelley
Keyword(s):  
Cross Sections ◽  
Atomic Beam ◽  
Absolute Measurement ◽  
Excited Atoms

scholarly journals A NEW METHOD TO DISTINGUISH BETWEEN MEIOTIC AND PREMEIOTIC RECOMBINATIONAL EVENTS IN DROSOPHILA MELANOGASTER

Genetics ◽  
1979 ◽  
Vol 92 (2) ◽  
pp. 543-554
Author(s):  
Yuichiro Hiraizumi
Keyword(s):  
Drosophila Melanogaster ◽  
Large Fraction ◽  
Overwhelming Majority ◽  
New Method ◽  
Male Recombination ◽  
The Past

ABSTRACT A new method is proposed to distinguish between meiotic and premeiotic exchange events in Drosophila melanogaster males associated with male recombination activities. The method was applied to data that have accumulated in this laboratory during the past five years, and it was concluded that a large fraction, perhaps the overwhelming majority, of the male recombinants were due to exchange events that took place before meiosis.

Frequency Redistribution Effects in the Formation of Lyman α in Prominences and Their Influence on the Ratio of Hα to Lα

1979 ◽  
Vol 44 ◽  
pp. 53-55
Author(s):  
R.W. Milkey ◽  
J.N. Heasley ◽  
E.J. Schmahl ◽  
O. Engvold
Keyword(s):  
Line Profile ◽  
Large Fraction ◽  
Partial Frequency ◽  
Frequency Redistribution ◽  
Partial Frequency Redistribution ◽  
Emergent Intensity

The effect of partial frequency redistribution in the formation of Lyman α in the chromosphere has been discussed by Milkey and Mihalas (1973) and others, and it has been shown that in this case the coherency of scattering in the wings of the line substantially influences the line profile. Although there are non-negligible sources for La photons within a prominence, a large fraction of the emergent line photons are due to scattering of photons incident on the surface of the prominence so that one expects that in a prominence the frequency redistribution processes will play an important role in determining the emergent intensity.

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