991 resultados para Ephrata (Pa.). Bauman
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60 MeV/u18O,239Pa239Pa239U,239Pa,239Pa(10630)min,232Th238U,,,235U,,232Th/238U235U/238U244Pu/238U,NA()/NB()=(PA/PB)f(A,B,S0,R,)239Pa,239Pa
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233Pa,,(Di-iso-propyl-ketone)PaF-Pa,Pa;-Pa
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Pa,Pa,(MIBK),,233Pa,Pa(),HFPa(),10 s,8 mol/LHClPa,HClHFPa
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pAK,CSR,pA
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TBP(),,233Pa,Pa()Pa()
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10 - 9Pa , , ,
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The extraction of protactinium with Aliquat 336 (methyl-tri-caprylyl ammonium chloride) in toluene, cyclohexane and chloroform from HCl, HNO3, H2SO4, HClO4, HF and mixed HCl-HF media was investigated by radioactive tracer technique. Distribution ratios of protactinium between the aqueous solution and the organic phase were determined as a function of shaking time, concentrations of acid in aqueous solution phase, extractant concentration and type of diluents in the organic phase. Aliquat 336 can almost quantitatively extract protactinium from strong HCl solution. At the same time, small amounts of HF in HCl solutions have a strong effect on Pa distribution.
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The estimation method of the universe age using the nuclear cosmochronology by the heavy chronometers is essentialized. The influence of the novel long half-life of Pa-239 on the universe age estimation is simply mentioned.
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The modification of ethylene-propylene copolymer (EP) has been accomplished by radical EP-graft-acrylic acid (EP-g-AA) has been used to obtain ternary PA/EP/EP-g-AA blends by melt mixing. Different blend morphologies were observed by scanning electron microscopy; the domain size of the EP-dispersed phase in the polyamide 1010 matrix of compatibilized blends decreased compared with that of uncompatibilized blends. It is found that EP-g-AA used as the third component has a profound effect on the mechanical properties of the resulting blends. This behavior has been attributed to serious chemical interactions taking place between the two components. Thermal analysis shows that some thermal properties of PA in compatibilized PA/EP/EP-g-AA changed because of chemical reactions taken place during the blending process. Wide angle x-ray diffraction measurements also confirmed this result. (C) 1996 John Wiley & Sons, Inc.
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