Observation of outer planets at Lyman alpha

A triple planetary observation in one IUE shift was conducted to measure the Lyman alpha reflectivity of Jupiter, Saturn and Uranus. The exposures were planned to take account of the light travel times, Sun to planet and planet to Earth, in order to assess the response of the three atmospheres to essentially the same incident solar flux. All additional uncertainties that were introduced when different instruments were used for such a comparative measurement were automatically eliminated

The social structure of crews of British dry cargo merchant ships: a study of the organization and environment of an occupation

This study, undertaken from 1967 to 1969, was of the crews of 28 British merchant ships. All told, 824 seafarers were interviewed, and basic sociographic data were obtained which were then applied to an analysis of the effects of the organization and social environment of seafaring as an occupation. The theoretical basis for the study was taken from the work of Burns and Stalker (1961) and Lawrence and Lorsch (1967, 1969). The concern was with the analysis of the organizational variables of shipboard life in relation to the attitudes and expectations of the seafarers. To isolate the organizational variables, matched pairs of shipping companies were chosen by size, type of trading pattern, and ownership. Bach company had also been ranked by seafarers in terms of preference as an employer, and each pair had a company that was preferred and one that was not. Six companies took part in the study. It was found that the preferred company in each pair was relatively organismic in comparison with the other company, and that companies with moderately certain market environments were less bureaucratic than companies with very certain or very uncertain market environments. The conclusion reached was that where there was a high level of integration of organizational subsystems, seafarers had a high level of perceived job satisfaction. The major factor in this integration was the ability to innovate within the work role of the individual seafarer and thus to create a sense of self-determination of the operation of the ship by the members of the shipboard community

Valuation of Retail Outparcels

Unavailable

A note on strictly cyclic Shifts on ℓ

In this paper the author shows that a well known sufficient condition for strict cycliclty of a weighted shift on ℓp is not a necessary condition for any p with 1<p<∞

Excitation of Na D-line radiation in collisions of sodium atoms with internally excited H2, D2, and N2

Excitation of D-line radiation in collisions of Na atoms with vibrationally excited N2, H2 and D2 was studied in two modulated crossed beam experiments. In both experiments, the vibrational excitation of the molecules was provided by heating the molecular beam source to temperatures in the range of 2000 to 3000 K, which was assumed to give populations according to the Boltzmann expression. In the first experiment, a total rate coefficient was measured as a function of molecular beam temperature, with absolute calibration of the photon detector being made using the black body radiation from the heated molecular beam source. Since heating affects both the internal energy and the collisional kinetic energy, the first experiment could not determine the relative contributions of internal energy transfer versus collisional excitation. The second experiment achieved partial separation of internal versus kinetic energy transfer effects by using a velocity-selected molecular beam. Using two simple models for the kinetic energy dependence of the transfer cross section for a given change in vibrational quantum number, the data from both experiments were used to determine parameters in the models

The population biology of the living coelacanth studied over 21 years

Between 1986 and 2009 nine submersible and remote-operated vehicle expeditions were carried out to study the population biology of the coelacanth Latimeria chalumnae in the Comoro Islands, located in the western Indian Ocean. Latimeria live in large overlapping home ranges that can be occupied for as long as 21 years. Most individuals are confined to relatively small home ranges, resting in the same caves during the day. One hundred and forty five coelacanths are individually known, and we estimate the total population size of Grande Comore as approximately 300–400 adult individuals. The local population inhabiting a census area along an 8-km section of coastline remained stable for at least 18 years. Using LASER-assisted observations, we recorded length frequencies between 100 and 200 cm total length and did not encounter smaller-bodied individuals (\100 cm total length). It appears that coelacanth recruitment in the observation areas occur mainly by immigrating adults. We estimate that the mean numbers of deaths and newcomers are 3–4 individuals per year, suggesting that longevity may exceed 100 years. The domestic fishery represents a threat to the long-term survival of coelacanths in the study area. Recent changes in the local fishery include a decrease in the abundance of the un-motorized canoes associated with exploitation of coelacanths and an increase in motorized canoes. Exploitation rates have fallen in recent years, and by 2000, had fallen to lowest ever reported. Finally, future fishery developments are discussed

The Bonn University lidar at the Esrange: technical description and capabilities for atmospheric research

International audienceThe Bonn University operates a Rayleigh/Mie/Raman backscatter lidar at the Esrange near the Swedish city of Kiruna, north of the Arctic circle. The lidar system covers the atmosphere from about 4 km to 100 km altitude and it is capable of measuring aerosols in the tropo-, strato-, and mesosphere, as well as of determining temperature profiles in the aerosol-free part of the atmosphere (i.e. above 30-km altitude). Density tuned fixed-spacer etalons provide daylight capability and thus increased sensitivity to noctilucent clouds during polar summer. Polarisation measurements allow liquid and solid phase discrimination for aerosol and cloud particles in the tropo- and stratosphere. The derived temperature profiles can be used for the detection and analysis of atmospheric gravity waves. Although several lidar experiments are situated in polar latitudes, a comprehensive instrument which covers the troposphere, stratosphere, and mesosphere, is daylight capable, and observes temperature profiles, as well as aerosols, is exceptional. In this article a technical description, in particular, of the optical configuration of this experiment is given, as well as an overview of achievable geophysical parameters. The potential for geophysical analyses is shown. Keywords. Atmospheric composition and structure (Instruments and techniques; Aerosols and particles; Pressure, density and temperature) ? Meteorology and atmospheric dynamics (Middle atmosphere dynamics

Testing of an improved ultrasound flowmeter: technical description and results of testing in vitro

In vitro testing was carried out of an advanced model of an intravascular flowgauge based on the ultrasound principle - that is, measurement of the difference in transit time of an upstream and downstream ultrasound pulse. The gauge was tested extensively to determine its sensitivity and stability as well as the influence of changes of haematocrit and temperature on its performanc