No abstract available

[en] The measured values of the ²¹⁰Pb concentration in the atmospheric deposition in the city of Cienfuegos, Cuba, are presented. A positive relationship is obtained among the concentration of ²¹⁰Pb in the atmospheric deposition and the total annual precipitation (r=0.66, p<0.001). It is suspected that the condition of being an island reduces the potential production ²¹⁰Pb, and therefore the concentration of this radionuclide in the atmospheric fallout

[en] Observations of pulsating auroras in the magnetic zenith and proton and electron auroras along the magnetic meridian were conducted from three stations covering from 58⁰ to 71⁰ invariant during the pulsating aurora campaign in Saskatchewan in January and February of 1980. Pulsations were observed only south of or on the southern edge of the proton precipitation region. This is in general agreement with other uncoordinated studies of proton and pulsating auroras in the late morning hours, but it also appears to be true for isolated events at other times as well. (auth)

No abstract available

[en] Highlights: • The aged Al–0.03Yb–0.06Zr alloy forms core-shell structured Al₃(Yb,Zr) precipitates. • The Al–0.03Yb–0.06Zr alloy obtains a maximum hardness of 485 MPa. • The Al₃(Yb,Zr) precipitates in Al–0.03Yb–0.06Zr have remarkable coarsening resistance. - Abstract: The precipitation hardening and coarsening resistance of precipitates were studied in Al–Yb, Al–Zr and Al–Yb–Zr alloys during aging at 400 °C. The aged Al–0.03Yb–0.06Zr alloy forms core–shell structured Al₃(Yb,Zr) precipitates and the core and shell of precipitates are enriched in Yb and Zr respectively. Due to the dense and core–shell structured Al₃(Yb,Zr) precipitates, the Al–0.03 at%Yb–0.06 at%Zr alloy obtains a maximum hardness of 485 MPa, which is greater than that of the Al–0.03 at%Yb and Al–0.06 at%Zr alloys. The Al₃(Yb,Zr) precipitates in Al–0.03 at%Yb–0.06 at%Zr have remarkable coarsening resistance with a time exponent for the average radius of precipitates 1/n = 0.19 ± 0.02, which is smaller than that for Al–0.03Yb (0.34 ± 0.01)

[en] The relationship of the afternoon/evening diffuse radio aurora, proton and electron precipitation and field-aligned currents is studied with data from the auroral radar at Slope Point, New Zealand, and the ISIS 2 satellite. It is shown that there is a very close association between the radio aurora and (primarily downward) field-aligned currents, which confirms and extends previous work, but that there is no clear relation with either proton or electron precipitation. (author)

[en] Using humidity exchange characteristics (precipitation and vapor) for the river Arafvi basin we have calculated a significant parameter having practical importance, i.e. quantitative response of the flow. This makes possible to conduct extra and interpolation areas of the flow curve and establish flow for any point and height. (author)

[en] The theoretical basis and the experimental evidence for the interpretation of photometric data in terms of precipitating particle morphology will be reviewed. Particular emphasis will be laid on the interpretation of auroral morphology in terms of the spectroscopic signature of the precipitating particles. The meridian scanning photometric data will be discussed briefly to emphasize the auroral morphology related findings. The new type of monochromatic TV system which was specially developed for two-dimensional spectrophotometric auroral imaging will be described. The auroral morphology related findings will be discussed according to the local time sector of the observations. The early evening auroras are characterized by soft electron precipitation on the equatorward edge of the auroral oval. This precipitation is not a steady diffuse region but it is structured and the structures show coherent convective motion often in the wastward direction. Harder precipitating features superimpose on this soft precipitation. These harder features (electrons 2 keV or larger) are observable by all-sky cameras and they participate in the substorm auroral dynamics. Following substorm onsets and northward expansions the electron auroras harden considerably and the protons expand poleward. During early morning the diffuse soft regions occur poleward of the hard auroral features. These early morning hard auroral features often show very hard pulsating patches. (author)

No abstract available

[en] A new concept in particulate control, called an advanced hybrid particulate collector (AHPC), is being developed under funding from the U.S. Department of Energy. The AHPC combines the best features of electrostatic precipitators (ESPs) and baghouses in a manner that has not been done before. The AHPC concept consists of a combination of fabric filtration and electrostatic precipitation in the same housing, providing major synergism between the two collection methods, both in the particulate collection step and in transfer of the dust to the hopper. The AHPC provides ultrahigh collection efficiency, overcoming the problem of excessive fine-particle emission with conventional ESPs, and it solves the problem of reentrainment and collection of dust in conventional baghouses