Hence, there is evidence that perceived sports competence affects hierarchically superior selfconcept dimensions, such as global physical self-concept and global self-esteem, especially when considered to be of great importance.
The central findings of this study revealed that individual differences in early adolescents’ importance of sports competence explain variations in the relationship between perceived sports competence and global self-esteem, yet normative gender-specific differences do not
A lubricator valve apparatus adapted for use when running wireline tools into an offshore well during a production test of the well. The valve includes a valve body having a central flow passage and a ball valve element for opening and closing the passage, hydraulically operable means responsive to surface-controlled pressure for opening and closing the ball valve, latch means for releasably holding the ball valve in both the open and the closed positions, and bypass valve means for equalizing pressures across the ball valve prior to opening thereof and arranged in the event hydraulic control of the ball valve is lost to be opened in response to pressure applied at the surface to the production pipe to provide a flow path for well control fluids.
Daniele Costa, Vijay Pereira, Joaquim Góis, Anthony S. Danko, António Fiúza
Published: Dec 2017
Public acceptance is crucial for the implementation of energy technologies. Hydraulic fracturing is a technology widely used in the USA for natural gas production from shale formations, but currently finds strong public opposition worldwide, especially in Europe. Shale gas exploitation and exploration have the potential to significantly reduce import dependency in several countries, including Spain. To better understand public opinion on this issue, this article reports a survey targeting both the entire Spanish population and the inhabitants of the province of Burgos, the location where shale gas exploration permits have already been issued. Results demonstrate that half of the Spanish population opposes shale gas, and this opposition increases in autonomous communities that are closer to possible exploration sites. The results also show that socio-demographic aspects are not strong predictors of opposition. In addition, Burgos' population show different behaviours toward shale gas that demonstrates that proximity and prospect of shale gas development affects opinion. Finally, there is still a great level of unfamiliarity with high volume hydraulic fracturing and shale gas in both populations sampled.
Abstract Geomorphology is a pure science with the goal of understanding Earth surface processes and landscape evolution, and it is also an applied science with the goal of addressing the needs of society. With many new high-resolution methods of depicting topography and much improved numerical dating, geomorphologists are working on problems involving rates of surface processes, landscape evolution, and applications to areas of concern to society that were impossible to address a few decades ago. Some of the areas of enquiry where geomorphology has been applied include: natural hazards (landslides, floods, earthquakes, and tsunamis), ecosystem management, site anthropology, land-use planning, engineering geology, expert witness testimony, and hazard reduction, assessment, and perception. How people perceive and respond to potential hazards, how their vulnerability can increase their risk, and how preparedness and response can be improved depends as much on the social sciences as on physical science.
Abstract. To assess the influence of various heat transfer processes on the
thermal structure of near-surface ice in Greenland's ablation zone, we
compare in situ measurements with thermal modeling experiments. A total of
seven temperature strings were installed at three different field sites,
each with between 17 and 32 sensors and extending up to 21 m below the
ice surface. In one string, temperatures were measured every 30 min, and
the record is continuous for more than 3 years. We use these measured
ice temperatures to constrain our modeling experiments, focusing on four
isolated processes and assessing the relative importance of each for the
near-surface ice temperature: (1) the moving boundary of an ablating surface,
(2) thermal insulation by snow, (3) radiative energy input, and (4) subsurface
ice temperature gradients below the seasonally active near-surface layer. In
addition to these four processes, transient heating events were observed in
two of the temperature strings. Despite no observations of meltwater
pathways to the subsurface, these heating events are likely the refreezing
of liquid water below 5–10 m of cold ice. Together with subsurface
refreezing, the five heat transfer mechanisms presented here account for
measured differences of up to 3 ∘ C between the mean annual air
temperature and the ice temperature at the depth where annual temperature
variability is dissipated. Thus, in Greenland's ablation zone, the mean
annual air temperature is not a reliable predictor of the near-surface ice
temperature, as is commonly assumed.
S. Rossini-Oliva, M. M. Abreu, E. S. Santos, E. Leidi
Published: Jan 2020
In Portugal, many abandoned mines are often close to agricultural areas and might be used for plant food cultivation. Soils in the vicinity of two Mn- and Fe-abandoned mines (Ferragudo and Rosalgar, SW of Portugal) were collected to cultivate two different food species ( Brassica rapa subsp. pekinensis (Lour.) Hanelt and Origanum vulgare L.). Chemical characterization of the soil–plant system and potential risk of adverse effects for human health posed by plants associated with soil contamination, based on the estimation of hazard quotient (HQ), were assessed in a microcosm assay under greenhouse conditions. In both soils, the average total concentrations of Fe and Mn were above the normal values for soils in the region and their concentration in shoots of both species was very high. Brassica rapa subsp. pekinensis grew better in Ferragudo than in Rosalgar soils, and it behaved as an excluder of Cu, Mn, Fe, S and Zn in both soils. The HQ for Cu, Fe, Mn and Zn in the studied species grown on both soils was lower than unit indicating that its consumption is safe. The high Mn tolerance found in both species might be due in part to the high contents of Fe in the soil available fraction that might contribute to an antagonism effect in the uptake and translocation of Mn. The obtained results emphasize the need of further studies with different food crops before cultivation in the studied soils to assess health risks associated with high metal intake.