Authors:Lucas Bomfim Bolzon and Alexandre G. S. Prado
, the aim of this article is to study the behavior of Nb 2 O 5 because of its protonation and deprotonation in order to understand the surface reactions of this catalyst and observe its thermodynamic properties.
Well focused beams of protons and other ions provide a very powerful means of determining how the elemental composition of
a sample varies over its surface. Observation of the X-rays from proton bombardment can provide great sensitivity in most
cases, while detection of nuclear effects has special applicability for elements of low atomic weight. A focusing system using
high precision magnetic quadrupoles was designed and built for use with the IBIS 3 MeV Van de Graaff generator. Measurements
of the first order focusing and aberrations agreed satisfactorily with theoretical predictions. The focused beam of 3 MeV
protons was measured to have a diameter of less than 4 μm. The target chamber, deflection system and display system are described
and examples given of use of the system. Backgrounds in X-ray detection are discussed and limits of detection are given.
A procedure has been developed to use the recoiled protons produced in neutron-proton scattering process for fast, nondestructive
determination of the hydrogen contents of coal samples. Samples from Hungary, Poland and Russia have been bombarded with 2.85
MeV neutrons from a small home-made neutron generator and the recoiled protons detected by a simple surface barrier detector.
To convert proton counts into hydrogen content, a calibration procedure was established for the method using prepared standards
of known hydrogen content and range for 2.85 MeV protons. Exploratory results obtained by this method compare favourably with
those obtained by the neutron reflection method.
Authors:Zh. F. Gesse, G. I. Repkin, V. A. Isaeva, and V. A. Sharnin
thermochemical study of glycine (simplest amino acid) protonation and silver(I) glycine-ion complexation in aqueous-dimethylsulfoxide of various content.
Silver(I) nitrate (high purity) and