The determination of phosphorus in milk samples by thermal neutron activation analysis employing radiochemical separation is described. The radiochemical separation consists of the simultaneous irradiation of samples and standards, dissolution of the milk...
National Technical Information Service (NTIS)
This work presents a study of environmental artificial and natural radioactivity levels in soil samples from the Southern Brazil and in soils and other environmental samples form Antarctica. Artificial radioactivity was determined by measuring Cs-137 whic...
This work presents a study of environmental artificial and natural radioactivity levels in soil samples from Southern Brazil and in soils and other environmental samples from Antarctica. Artificial radioactivity was determined by measuring Cs-137 which is...
By means of the neutron diffraction technique the texture of 5% and 98% rolled-aluminium and of iron-silicon steel used in the core of electric transformers, have been determined. The measurements were performed by using a neutron diffractometer installed...
Geometrical elements affecting the radon family equilibrium factor are examined in measuring with atmospheric samples. The general arguments are applied equally to any alpha-particles detector. However the examples worked out in this paper are restricted ...
The precision and the sensibility of measures of activity, made by a radioactivity counter, improve as function of counting time. The precision also increases as the measured activities do. This work describes an auxiliary method for division of time avai...
Recently interest has grown in the determination of the concentration of inorganic chemical elements in honey bee samples, due its utilization as indicator of environmental pollution in several countries of Europe. In the present work, a method was develo...
A method for the determination of uranium and its isotopic ratios (sup(235)U/ sup(238)U and sup(234)U/ sup(238)U) is established in the present work. The method can be applied in environmental monitoring programs of uranium enrichment facilities. The prop...
From samples collected by geologists in several points of G2 and G3 gallery of Itataia Uranium Phosphate mine, intended to get knowledge about several lithologic types of ores, mainly its alteration grades. Petrographic-mineralogical studies, liberation g...
The boron neutron capture therapy (BNCT) has shown better prognosis in the treatment of glyemas and gluoblastomas grade III and IV than other therapies. During the treatment the levels of Na(sub 2)(sup 10)B(sub 12)H(sub 11)SH must be known in several comp...
Estudamos o ambiente de gal�xias com forma��o estelar inicialmente a partir de uma amostra limitada em volume proveniente do 2dF Galaxy Redshift Survey. Discriminamos as gal�xias com forma��o estelar com base em distintas classes espectrais, utilizando para esta classifica��o as larguras equivalentes das linhas ...
NASA Astrophysics Data System (ADS)
A deriva��o de abund�ncias qu�micas de nebulosas planet�rias permite a investiga��o dos processos de enriquecimento qu�mico ocorridos durante a evolu��o das estrelas progenitoras, que t�m massas entre 0.8 e 8 massas solares. Adicionalmente as abund�ncias de elementos como oxig�nio, arg�nio ou ne�nio, que n�o s�o produzidos por nucleoss�ntese na progenitora, ...
Gradientes radiais de abund�ncia s�o observados no disco de nossa Gal�xia e tamb�m em outras gal�xias espirais. No caso da Gal�xia, o principal problema relativo aos gradientes � sua varia��o temporal, que constitui um dos principais v�nculos aos modelos de evolu��o qu�mica da Gal�xia. As nebulosas planet�rias s�o particularmente interessantes ...
... with half rates of acetochlor + atrazine, flumetsulam, or pendimethalin reduced control of velvetleaf compared with the full ... residual herbicides. Nomenclature: Acetochlor; atrazine; flumetsulam; glufo...
NBII National Biological Information Infrastructure
... metolachlor, and (3) measure the effect of herbicide microencapsulation on acetochlor injury. Herbicides were applied preemergence at ... acetochlor applied at three times the registered rate. Microencaps...
For each positive integer n, let Fn be a free group of rank n with basis (in other words, free generating set) {x1, �, xEM>n>} . If [theta] is an automorphism of <EM>Fn> then {<EM>x>1[theta], �, ...
Este trabalho consiste no estudo de uma amostra de estrelas simbi�ticas amarelas cujas componentes frias apresentam tipos espectrais G ou K. Uma amostra de 20 estrelas foi usada, o que corresponde ao conjunto completo de estrelas simbi�ticas amarelas vis�veis no hemisf�rio sul presentes no cat�logo de Belczynski et al (2000 A&A Suppl. 146, ...
... Acetochlor Amitraz Ammonia Azadirachitin Benzaldehyde Bitertanol Ethephon Fomesafen Imazaquin Oxytetracycline ...
EPA Pesticide Factsheets
... Acetochlor ? Amitraz ? Ammonia ? Azadirachitin ? Benzaldehyde ? Bitertanol ? Ethephon ? Fomesafen ? Imazaquin ? Oxytetracycline ? Procymidone ...
Os aglomerados globulares s�o considerados laborat�rios astrof�sicos para a verifica��o da teoria de evolu��o estelar, bem como a trajet�ria qu�mio-din�mica das gal�xias hospedeiras. Em particular, 47 Tucanae (NGC 104) configura-se como um dos mais extensivamente estudados aglomerados globulares da Gal�xia devido a relativa proximidade ao Sol (R� = ...
Tem sido pr�tica comum nos �ltimos anos estudar a distribui��o de luminosidade em gal�xias fazendo uso da informa��o contida em toda a imagem da gal�xia, j� que esta t�cnica tem se mostrado muito mais confi�vel do que o simples ajuste de perfis radiais de luminosidade. Atrav�s destes estudos bidimensionais, melhores resultados tem ...
This study aimed to evaluate new methodology for designing ecologically acceptable formulations of acetochlor. Modification of montmorillonite with phenyltrimethylammonium chloride (PTMA) or benzyltrimethylammonium chloride (BTMA) and organoclay formulations of acetochlor were prepared in the presence of high concentrations of sodium chloride (150 g/L). ...
PubMed
