Classification of contraceptives available to modern students

The article considers the classification of contraceptives with an analysis based on the safety criterion. Comparative analysis of contraceptives (barrier, biological, surgical, hormonal, intrauterine) was carried out taking into account their availability to students.В статье рассмотрена классификация контрацептивных средств с анализом по критерию безопасности. Компаративный анализ контрацептивных средств (барьерные, биологические, хирургические, гормональные, внутриматочные) осуществлен с учетом их доступности студенческой молодежи

Experimental study of intrinsic multiple Andreev reflections effect in GdO(F)FeAs superconductor array junctions

We report the first observation of the intrinsic multiple Andreev reflections effect (IMARE) in S-n-S-...-S-arrays (S = superconductor, n = normal metal) formed by "break-junction" technique in GdO(F)FeAs superconductor (Tc = 48 - 53 K). We show that superconducting gap peculiarities at dI/dV-spectra sharpen dramatically in the arrays as compared with that in the single-contact spectra; this enables to improve significantly accuracy of the bulk superconducting parameters determination. Using IMARE, we determined the large and the small gap values \Delta_L = 11 +- 1.1 meV and \Delta_S = 2.6 +- 0.4 meV. The BCS-ratio 2\Delta_L/kTc^{local} = 5.0 - 5.9 > 3.52 (Tc^{local} is the contact area critical temperature) evidences for a strong electron-boson coupling. The results obtained agree well with our previous data by Andreev spectroscopy for single SnS-contacts.Comment: 6 pages, 6 figure

Capabilities of percutaneous biopsy methods to preoperatively verify breast microcalcinates

Information on the morphological type of a tumor is of crucial importance for successfully planning the treatment of patients with breast cancer (BC). Technological progress in the past decade has led to quality improvement in the diagnosis of particularly nonpalpable BC, one of whose manifestations is microcalcinates. Adequate use of mini-invasive procedures for obtaining materials for morphological analysis is favorable for extending the capabilities of accurate preoperative diagnosis verification to effectively plan a patient treatment and rehabilitation program