A COLUMN STUDY OF SOIL CONTAMINATION BY LEAD: INFLUENCE OF pH AND CARBONATE CONTENT. I. EXPERIMENTAL RESULTS

2001 ◽  
Vol 36 (4) ◽  
pp. 437-446
Author(s):  
J. M. Rodríguez-Maroto ◽  
C. Vereda-Alonso ◽  
C. Gómez-Lahoz ◽  
F. García-Herruzo ◽  
R. A. García-Delgado
2001 ◽  
Vol 36 (6) ◽  
pp. 1015-1026
Author(s):  
José M. Rodríguez-Maroto ◽  
Cesar Gómez-Lahoz ◽  
Carlos Vereda-Alonso ◽  
Rafael A. García-Delgado ◽  
Francisco García-Herruzo

2005 ◽  
Vol 51 (1) ◽  
pp. 172-180 ◽  
Author(s):  
Bruno Huet ◽  
Valérie L’Hostis ◽  
Frédéric Miserque ◽  
Hassane Idrissi

2017 ◽  
Vol 7 (1) ◽  
pp. 5-21 ◽  
Author(s):  
O. V. Zhukov ◽  
O. V. Potapenko

<p>In present article the synphytoindication of environmental conditions formed in the areas of power substations and set the direction of environmental transformations caused by soil contamination substations technological oil have been performed. Studies have been conducted in the autumn of 2016. Relevés have been made on 19 power substations. Geobotanical description have been within each sub-station separately for control site, which has not experienced the negative impact of oil spills and technological area with obvious traces of the spill process oil. Moreover, the substations within the description made in additional areas. The total number of relevés is 51, of which 22 are in control conditions and 29 are in process oil contaminated sites. In terms hygromorphes investigated edaphotopes can be attributed to those that are favorable for plant environmental group sub-mesophytes. The variability of damping forms the regime that are favorable to the ecological group of hemi-hydrocontrastophiles. The soil acidity forms favorable regime for sub-acidophiles. Th total salt regime may be stated as being favorable for mesotrophes. The regime of the carbonate content in soil may be attributed to those that are favorable for acarbonatophiles. The nitrogen content in soil are favorable for hemi-nitrophiles. The soil aeration is favorable for sub-aerophiles. The thermal climate of ecotypes can be considered as immoral. In the study area the radiation balance of 2045.3 MJ • m 2 • hr-1. The humidity can be evaluated as such, which is favorable sub-aridophytes. The difference between the amount of precipitation and evaporation according to phytoindication is –299.1 mm. The continentality of climate can be estimated as hemi-continental. The phytoindication evaluation reveals that the temperature of the coldest month is –4,8 ° C. The light mode is heliophyte friendly. The synphytoindication method has been shown to be a quite informative for environmental regimes detection due to anthropogenic transformation of ecotops. Ability to use tools phytoindication designed for natural ecosystems, for the purposes of the environmental assessment of anthropogenically transformed areas, caused by non-specific nature of the response of communities living organisms on pollution. Against the background of the natural gradient, which is subject to environmental conditions in the relevant part of the steppe zone, where power substations are studied, and their vegetation cover reflects some of the specific features inherent in this is man-made formations. First of all, it thermal climate whose valuation is impossible to explain the relevant gradients. This feature of the thermal climate accompanied by increased light mode and an increased level of human-induced soil aeration. We obtained evidence that pollution leads to unification of ecological structure of the plant community. Under the influence of pollution there is a transition to a final state, which is to some extent independent of the initial ecological diversity of communities. Unification of ecological structure of vegetation under the influence of soil contamination with oil technology is a testament to the unification of the environmental conditions.</p>


1988 ◽  
Vol 102 ◽  
pp. 357-360
Author(s):  
J.C. Gauthier ◽  
J.P. Geindre ◽  
P. Monier ◽  
C. Chenais-Popovics ◽  
N. Tragin ◽  
...  

AbstractIn order to achieve a nickel-like X ray laser scheme we need a tool to determine the parameters which characterise the high-Z plasma. The aim of this work is to study gold laser plasmas and to compare experimental results to a collisional-radiative model which describes nickel-like ions. The electronic temperature and density are measured by the emission of an aluminium tracer. They are compared to the predictions of the nickel-like model for pure gold. The results show that the density and temperature can be estimated in a pure gold plasma.


Author(s):  
Y. Harada ◽  
T. Goto ◽  
H. Koike ◽  
T. Someya

Since phase contrasts of STEM images, that is, Fresnel diffraction fringes or lattice images, manifest themselves in field emission scanning microscopy, the mechanism for image formation in the STEM mode has been investigated and compared with that in CTEM mode, resulting in the theory of reciprocity. It reveals that contrast in STEM images exhibits the same properties as contrast in CTEM images. However, it appears that the validity of the reciprocity theory, especially on the details of phase contrast, has not yet been fully proven by the experiments. In this work, we shall investigate the phase contrast images obtained in both the STEM and CTEM modes of a field emission microscope (100kV), and evaluate the validity of the reciprocity theory by comparing the experimental results.


Author(s):  
A. Ourmazd ◽  
G.R. Booker ◽  
C.J. Humphreys

A (111) phosphorus-doped Si specimen, thinned to give a TEM foil of thickness ∼ 150nm, contained a dislocation network lying on the (111) plane. The dislocation lines were along the three <211> directions and their total Burgers vectors,ḇt, were of the type , each dislocation being of edge character. TEM examination under proper weak-beam conditions seemed initially to show the standard contrast behaviour for such dislocations, indicating some dislocation segments were undissociated (contrast A), while other segments were dissociated to give two Shockley partials separated by approximately 6nm (contrast B) . A more detailed examination, however, revealed that some segments exhibited a third and anomalous contrast behaviour (contrast C), interpreted here as being due to a new dissociation not previously reported. Experimental results obtained for a dislocation along [211] with for the six <220> type reflections using (g,5g) weak-beam conditions are summarised in the table below, together with the relevant values.


Author(s):  
Scott Lordi

Vicinal Si (001) surfaces are interesting because they are good substrates for the growth of III-V semiconductors. Spots in RHEED patterns from vicinal surfaces are split due to scattering from ordered step arrays and this splitting can be used to determine the misorientation angle, using kinematic arguments. Kinematic theory is generally regarded to be inadequate for the calculation of RHEED intensities; however, only a few dynamical RHEED simulations have been attempted for vicinal surfaces. The multislice formulation of Cowley and Moodie with a recently developed edge patching method was used to calculate RHEED patterns from vicinal Si (001) surfaces. The calculated patterns are qualitatively similar to published experimental results and the positions of the split spots quantitatively agree with kinematic calculations.RHEED patterns were calculated for unreconstructed (bulk terminated) Si (001) surfaces misoriented towards [110] ,with an energy of 15 keV, at an incident angle of 36.63 mrad ([004] bragg condition), and a beam azimuth of [110] (perpendicular to the step edges) and the incident beam pointed down the step staircase.


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