Age dating of liquid Sr-Y sources.

In the context of age dating of Sr, the selective adsorption of zirconium ions from the mixture with strontium and yttrium by adsorbents based on TiO with a chemically modified surface was investigated. The general features of the separation process of strontium, yttrium, and zirconium in batch conditions were determined. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was used to analyze the initial and residual concentrations of the studied cations.

Investigation of the chemical and radiation stability of titanium dioxide with surface arsenate groups during Sr adsorption.

The chemical and radiation stability of titanium dioxide with surface arsenate groups during Sr adsorption has been studied. The oxalate technique has been used to obtain a solution containing Sr from the objects of the aquatic environment of the Chornobyl Exclusion Zone. The dependence of the strontium adsorption on the acidity of the solution and the initial activity of the solution (Bq per mL) has been shown.

Equilibrium studies of yttrium adsorption from aqueous solutions by titanium dioxide.

This research evaluates the adsorption of yttrium from aqueous solutions by titanium dioxide with surface arsenate groups (4As-TiO) and titanium dioxide with surface arsenate groups doped by neodymium (Nd/4As-TiO). The impacts of various adsorption parameters such as contact time, pH and initial metal concentrations were investigated in batch adsorption experiments. Experimental data for yttrium ions adsorption onto Nd/4As-TiO fits well with the Elovich kinetic model (R = 0.

[Characteristics of the reproductive health of female population in Ukraine].

Objective: Introduction: The state of reproductive health of female population is an important factor of population reproduction. The aim: To study and analyze the dynamics of reproductive health indices of female population in Ukraine.

Patients And Methods: Materials and methods: Statistical and bibliosemantic methods were applied in the course of study.

Comparative characterization of polymethylsiloxane hydrogel and silylated fumed silica and silica gel.

Polymethylsiloxane (PMS) hydrogel (C(PMS)=10 wt%, soft paste-like hydrogel), diluted aqueous suspensions, and dried/wetted xerogel (powder) were studied in comparison with suspensions and dry powders of unmodified and silylated nanosilicas and silica gels using (1)H NMR, thermally stimulated depolarization current (TSDC), quasielastic light scattering (QELS), rheometry, and adsorption methods. Nanosized primary PMS particles, which are softer and less dense than silica ones because of the presence of CH(3) groups attached to each Si atom and residual silanols, form soft secondary particles (soft paste-like hydrogel) that can be completely decomposed to nanoparticles with sizes smaller than 10 nm on sonication of the aqueous suspensions. Despite the soft character of the secondary particles, the aqueous suspensions of PMS are characterized by a higher viscosity (at concentration C(PMS)=3-5 wt%) than the suspension of fumed silica at a higher concentration.