Chemical elements
Exotic nuclei and synthesis of chemical elements.
... OF CHEMICAL ELEMENTS. We have around ninety chemical elements available in nature, which were produced mainly by nuclear reactions inside ...Heavier elements are synthesized by neutron ...
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Regional geochemical reference for the interpretation of the chemical elements concentrations in the sediment samples from Lago Paranoá watershed-DF.
... THE CHEMICAL ELEMENTS CONCENTRATIONS IN THE SEDIMENT SAMPLES FROM LAGO PARANOÁ ...of chemical elements in sediment samples was controlled through the variation in the amounts of organic ...
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Characterization of chemical elements in soil submitted to different systems use and management by energy dispersive x-ray fluorescence spectrometry (EDXRF).
... OF CHEMICAL ELEMENTS IN SOIL SUBMITTED TO DIFFERENT SYSTEMS USE AND MANAGEMENT BY ENERGY DISPERSIVE X-RAY FLUORESCENCE SPECTROMETRY ...the chemical elements levels in soil, submitted to ...
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Screening investigation of toxic chemical elements in school supplies by x-ray fluorescence.
... SCREENING INVESTIGATION OF TOXIC CHEMICAL ELEMENTS IN SCHOOL SUPPLIES BY X-RAY FLUORESCENCE. Compulsory in Brazil, toy certiication aims to prevent possible risks in toy use. The Brazilian National ...
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BACKGROUND VALUES FOR CHEMICAL ELEMENTS IN SEDIMENTS OF THE GUALAXO DO NORTE RIVER BASIN, MG, BRAZIL
... different chemical elements is analyzed and from this analysis it is possible to interpret the data and make considerations and inferences on the sampled population and consequently on the study ...
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Characterization, feasibility and optimization of Agaricus subrufescens growth based on chemical elements on casing layer
... limestone with gypsum was applied. Yield and biological efficiency were negatively correlated with H + AL, organic matter and Mg amount. Furthermore, earliness was positively correlated with H + Al, organic matter, and ...
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On the Descriptive Geometric Interpretation of Pauli Principle, Elements of the Mendeleev Table of Chemical Elements, and the Newtonian Laminar Current of a Liquid
... 22 shows the results (similar to those that were shown in Fig. 21 f, h, and j) of numerical calculations of layers of the nonlinear arithmetic parallelepiped for the eighth R shell in th[r] ...
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Some historical aspects of the periodic classification of the chemical elements.
... A classificação de Newlands (1863) tinha 11 grupos basea- dos em analogias nas propriedades químicas. Os pesos atômi- cos de muitos pares de elementos com propriedades análogas eram múltiplos de 8. Daí surgiu a “Lei das ...
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Trace elements detection in whole food samples by neutron activation analysis, k0-method
... more chemical elements in the composition of this food than those reported in tables about food composition The technique selected for the determination of the elemental composition of food samples was the ...
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A Weld Defects Detection System Based on a Spectrometer
... This work proves that it is possible to improve a non-destructive and on-line weld defects monitoring system using the radiation emitted by chosen chemical elements, involved in the welding process, and ...
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Braz. Dent. J. vol.27 número2
... combined with a zinc oxide cement at different ratios (1:0.5, 1:0.65, 1:0.8 and 1:1). Materials were compared regarding setting time, pH variation, radiopacity, solubility, dimensional changes, flow and release of ...
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Evaluation of trace elements mobility from soils to sediments between the Iberian pyrite belt and the Atlantic Ocean
... 1979). Chemical elements can be mo- bilized from the mining areas by physical processes associated to partic- ulate matter, transported in suspension, or even, as chemical species in solution and ...
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Rosildo Santos PAIVA4 , Pryscila Denise ALMEIDA5
... Rivers are the principal routes of transport of dissolved and particulate matter from inland areas to the oceans. This matter may be assimilated by planktonic organisms, which are one of the key components of the trophic ...
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Natália Aragão de Figueredo2 , Liovando Marciano da Costa2 , Leônidas Carrijo Azevedo Melo3 , Evair Antônio Siebeneichlerd2 and Jairo Tronto4
... the chemical characteristics of BC that can affect the processes involved in geoavailability of chemical elements, which allows development of measures to decrease leaching and immobilization, ...
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Repositório Institucional da UFPA: Chemical composition of phytoplankton from the estuaries of Eastern Amazonia
... dissolved chemical elements. Physico-chemical and chemical parameters (pH, salinity, temperature, and nitrate concentrations) were measured in situ using a (Horiba W-23XD multi-probe Kyoto, ...
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Portable X-ray fluorescence (pXRF) spectrometry applied to the prediction of chemical attributes in Inceptisols under different land uses
... of chemical elements in a few seconds and without the production of sample waste (Ribeiro et ...soil chemical properties, such as pH (Sharma et ...
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Rev. Soc. Bras. Med. Trop. vol.46 número5
... the elements, an automatic biochemical analyzer was used to detect the types and levels of biochemical indices, and an automatic amino acid analyzer was used to detect the types and levels of amino acids in the ...
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2 MATERIAL AND METHODS 2.1 Study site
... of chemical elements in rainwater are influenced by anthropogenic factors, including: thermoelectric plants, ironworks, fertilizer plants and residue burning, in addition to natural factors (CAMPOS et ...
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Primes, Geometry and Condensed Matter
... identical elements, we examine plots of the masses of chemical elements of the periodic table, and also those of the elementary particles of physics, and show that prime packing rules seem to play a ...
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Size variation in the vascular cambium and its derivatives in two Alstonia species
... vessel elements, xylem fibres and xylem parenchyma; the radial system consists of ray ...Vessel elements are distributed in small multiples of 2-9 cells, thick walled, with pitted thickening (vestured ...
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