[en] The ternary system KReO₄-RbReO₄-CsReO₄ has been studied. The liquid-solid equilibrium diagrams for ternary and all binary systems have been worked out. 10 refs, 4 figs

[en] A review of literature on the analysis of lanthanides performed by means of UV and IR absorption spectrophotometry, luminescence, spectral emission analysis, atomic absorption, mass spectrography and spectrometry as well as by ion exchange chromatography is given. It has been found that in direct and simultaneous determination of many lanthanides occuring over a wide concentration range the most precise results are obtained by the mass spectrography and ion exchange chromatography with fluorescent indicators. (author)

[en] A review of the literature dealing with the extraction of lanthanides and yttrium with di 2-ethylhexyl phosphoric acid is presented. The effect of various factors on the distribution coefficient is discussed. The distribution coefficient increases with the increase in the atomic number of a lanthanide. In this series yttrium is placed between holmium and erbium. An increase in acid concentration in the aqueous phase reduces the distribution coefficient; for diluted solutions it is inversely proportional to the cube of acid concentration, for concentrated solutions no such relation is found. The type of solvent used affects considerably the distribution coefficient. In the hydrocarbon systems the distribution coefficients are much higher than those in alcoholic systems. The mechanism of the extraction process is complicated and depends on acid concentration in the aqueous phase. To simplify the matter, one may assume that at low acid concentrations three dimerized extraction solvent molecules split off one hydrogen ion and attach one lanthanide ion. At high acid concentrations the above mechanism is replaced by the solvation mechanism. The distribution coefficients of lanthanides at other oxidation states are very different from those at oxidation state (3); the distribution coefficient of cerium (4) is about 1000 times greater than that of cerium (3) whereas the distribution coefficient europium (2) is at least 1000 times smaller than that of europium (3). This provides for relatively easy separation of cerium and europium from a mixture of lanthanides by the fractional extraction method. (author)

[en] Full text: The ATLAS Inner Detector has been an integral part in many physics analyses of the ATLAS experiment since the start of data taking in late 2009. We present the performance of the innermost tracking detector in the context of physics measurements that have been carried out using track and vertexing information. Comparisons to results obtained with the full detector simulation will be included and a general assessment of the understanding of the system alignment and detector effects will be given. Finally, an outlook of a potential detector upgrade with a newly inserted innermost pixel layer will be given. (author)

[en] The molar excess Gibbs free energy Gsup(E) and excess chemical potentials μsup(E)(KReO₄) and μsup(E)(CsReO₄) were determined for ((1-x)KReO₄ + xCsReO₄)(s) at 806 K. The Knudsen-cell mass-spectrometric technique was used. For the empirical representations: Gsup(E) = x(1-x)(B₁ + B₂(2x-1)), μsup(E)(KReO₄) = x²[B₁ + B₂(4(x-1) + 1)], μsup(E)(CsReO₄) = (1-x)[B₁(1-x)-B₂((1-2x)²-x)], the parameters B₁ = 5.49 kJ mol^-1 and B₂ = -0.43 kJ mol^-1 were obtained. (author)

[en] Using Knudsen cell mass spectrometry thermodynamic activities of components of the system KReO⁴-RbReO⁴ were determined for the solid state at 806 K and for the liquid state at 855 K. The unlimited solubility of both components in the solid phase and small positive deviations from ideality were found. (author)

[en] Mass spectrum of vapours over copper(1) perrihenate has been investigated. The composition of vapours, the vapour pressure and enthalpy of vaporization of particular vapour components have been determined in the temperature range 650 to 780 K. (author)

[en] Most of the programmes for the evaluation of radio in vitro tests proceed from the anticipation that the best method should give an approximation of standard values by a curve as perfect as possible. According to our experiences this demand, however, is not decisive for a good standard curve, as in principle all standard values can be incorrect. The application of relatively simple linearising transformations and an additional curve (recovery of a normal serum) guarantees the necessary precision in the programme described. After a short description of the contents of the system, the programme for the assessment of CPBA-methods is shown, by help of which the sample changer-calculator-system determines the absolute concentration of the substance to be measured. This makes the starting point for the more complex RIA programme which methodologically takes into consideration the special problems of these tests. (orig.)

[en] Mass spectra of thallium(1) perrhenate were investigated. The composition and pressure of vapours, as well as enthalpy of sublimation of thallium(1) perrhenate were determined within the temperature range 550-700 K. (author)

[en] In the energy dispersive analysis (electron microscope, scanning electron microscope) of ettringite monocrystals which are formed in highly aqueous cement suspensions a chemical composition is obtained which is very different from a phase in the generally accepted meaning of the term. A characteristic feature of this ettringite is that part of the Al₂O₃ content in the columns is replaced by SiO₂. Besides, the SO₃ in the canals may be partly replaced by SiO₂. The differences in content are in all probability dependent on the type of cement initially used, the amount of sulphate additionally introduced, and the length of time of reaction. (orig.)