36 Result(s)
within
K. Kudo
Physical Chemistry
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Article
Palladium(II)-catalyzed hydroesterification of enol esters: Remarkable α-substituent effect upon regioselectivity
Pd(II)-catalyzed hydroesterification of various enol esters smoothly proceeded upon the combined use of pressurized carbon monoxide and methanol to give the α-or β-acetoxy esters with the regioselectivity high...
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Chapter and Conference Paper
Production of a Reference Monoenergetic Neutron Field Using D(d,n)3He Reaction
A reference energy neutron field, produced by a D(d,n)3He reaction using a Cockcroft-Walton type accelerator, has been developed. Calculated results showed that neutrons which are emitted at an angle of 100°, wit...
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Article
Substoichiometric precipitation of silicon as barium fluorosilicate
Distillation and substoichimetric precipitation for silicon have been developed for the determination of trace amounts of silicon. It is based on substoichiometric precipitation as barium fluorosilicate and th...
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Article
Determination of oxygen in gallium arsenide by3He activation analysis using substoichiometric precipitation
Distillation of fluoride as fluorosilicic acid and substoichiometric precipitation as lanthanum fluoride was studied for the determination of oxygen in gallium arsenide by3He activation analysis. Fluoride could b...
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Article
Simultaneous determination of rare earth elements by using substoichiometric separation of lanthanium
An analytical method for the simultaneous determination of rare earth elements by using substoichiometry with two chelating agents, a complexon and an extracting agent, is proposed. The principle of the method...
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Article
Study on the comparator method using substoichiometry I. Principle
A new comparator method using substoichiometry was developed. In this method, the content of the element can be determined by the measurement of both radioactivities of an isolated part of the element in quest...
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Article
Determination of radioactive nuclides of uranium and thorium series and estimation of α-flux in LSI constituent materials
Gamma-rays of nuclides of uranium and thorium series in silicone resin and ceramics were measured with a Ge(Li) detector. The state of radioactive equilibrium was determined by comparing the concentrations of ...
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Article
Determination of trace elements in various materials by activation analysis
Recent works on the trace analysis of various materials by activation analysis are summarized. INAA and IPAA are applied for the multielement determination of various standard reference materials and electroni...
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Article
Determination of uranium by neutron activation analysis using substoichiometric separation
Three analytical methods for uranium by neutron activation are described. The methods are based on the substoichiometric separation of barium or lanthanum, which are the fission products of uranium-235 by neut...
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Article
Determination of trace elements in semiconductor materials by neutron activation analysis using the radioisotope addition technique
The determination of trace elements in highly activated matrix components was carried out by neutron activation analysis using the radioisotope addition technique. The method is based on the addition to the ir...
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Article
Substoichiometric determination of lanthanum by using EDTA and 8-hydroxyquinoline
The substoichiometric separation of lanthanum was studied on the system EDTA —lanthanum—8-hydroxyquinoline. The optimum conditions for the substoichiometric separation of lanthanum were calculated theoreticall...
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Article
Substoichiometric precipitation of fluoride with lanthanum
The substoichiometric precipitation of fluoride with lanthanum was studied by using18F and140La tracers and it was found that fluoride could be precipitated substoichiometrically with lanthanum and the reaction r...
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Article
Radiochemical separation of fluorine using hydrated tin dioxide as an inorganic ion exchanger
The separation of fluorine was studied by several inorganic ion exchangers. A high yield of adsorption for fluorine was obtained using hydrated tin dioxide in 1N nitric acid. Fluorosilicate can be separated un...
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Article
Determination of oxygen with reactor neutrons
Oxygen in silicon was determined by the secondary nuclear reactions of6Li(n, α)T and16O(t, n)18F. Lithium fluoride was deposited in vacuum on fused quartz, covered with the sample and irradiated in a nuclear reac...
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Article
Substoichiometric determination of phosphorus
Phosphorus in orchard leaves (NBS SRM-1571) and spinach (SRM-1570) was determined by various substoichiometric analytical methods such as the direct method, GRASHCHENKO's method and the method of carrier amoun...
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Article
Determination of uranium and thorium and measurement of alpha-particles in lsi materials
Uranium and thorium in LSI materials were determined by INAA and α-particles in these materials were also measured. The contents of uranium and thorium and the α-activity in ceramics and zirconia samples were ...
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Article
Application of instrumental neutron activation analysis in Czochralski silicon crystal growth
Contamination sources of trace elements introduced into silicon crystals grown by the Czochralski technique are investigated: the signale comparator method in neutron activation analysis is applied to the dete...
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Article
Substoichiometric extraction of phosphorus
A study of the substoichiometric extraction of phosphorus is described. Phosphorus was extracted in the form of ternary compounds such as ammonium phosphomolybdate, 8-hydroxyquinolinium phosphomolybdate, tetra...
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Article
Recent aspect of substoichiometry in trace analysis
A review of the substoichiometry in trace analysis is presented. Recent new developments and practical applications are described.
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Article
Substoichiometric extraction of chromium
Substoichiometric extraction of chromium with tetraphenylarsonium chloride (TPACl), tri-n-octylamine (TNOA), diethylammonium diethyldithiocarbamate (DDDC) and ammonium pyrrolidinedithiocarbamate (APDC) was exa...
