Advantages of Ferroelectrics as a Component of Heterostructures for Electronic Purposes: A DFT Insight.

The main advantage of using ferroelectric materials as a component of complex heterostructures is the ability to tune various properties of the whole system by means of an external electric field. In particular, the electric field may change the polarization direction within the ferroelectric material and consequently affect the structural properties, which in turn affects the electronic and magnetic properties of the neighboring material. In addition, ferroelectrics allow the electrostriction phenomenon to proceed, which is promising and can be used to affect the magnetic states of the interface state in the heterostructure through a magnetic component.

DFT Insight into Conductive and Magnetic Properties of Heterostructures with BaTiO Overlayer.

The ab initio calculations of a heterostructure based on the ferroelectric phase of barium titanate and dielectrics lanthanum manganese (LaMnO) or silicon (Si) are presented. We analyze structures of BaTiO/LaMnO and BaTiO/Si interfaces, investigate magnetic properties and the impact of ferroelectric polarization. The use of ferroelectrics in the heterostructure plays a crucial role; in particular, ferroelectric polarization leads to the appearance of the conducting state at the interface and in the layers close to it.

Origin of Negative Photoconductivity at the Interface of BaSrTiO/LaMnO/BaSrTiO Heterostructures.

The study of BaSrTiO/LaMnO/BaSrTiO heterostructures on a MgO substrate with BaSrTiO ferroelectric films revealed the occurrence of a metallic character of the temperature behavior of the resistance at a temperature less than 175 K. This behavior is associated with an increased charge concentration at the interface due to a discontinuity in the ferroelectric polarization at the interface between the films. At these temperatures, the effect of negative photoconductivity is observed under uniform illumination with the light of a selected spectral composition event on the surface of the ferroelectric film.

Fabrication of High-Temperature Quasi-Two-Dimensional Superconductors at the Interface of a Ferroelectric Ba_{0.8}Sr_{0.2}TiO_{3} Film and an Insulating Parent Compound of La_{2}CuO_{4}.

We report the first observation of superconductivity in a heterostructure consisting of an insulating ferroelectric film (Ba_{0.8}Sr_{0.2}TiO_{3}) grown on an insulating parent compound of La_{2}CuO_{4} with [001] orientation.

Effect of national HIV testing recommendations and local interventions on HIV testing practices in a Swiss university hospital: a retrospective analysis between 2012 and 2015.

Objectives: Despite HIV testing recommendations published by the Federal Office of Public Health (FOPH) since 2007, many individuals living with HIV are diagnosed late in Switzerland. The aim of this study is to examine the effect of the 2013 FOPH HIV testing recommendations on HIV testing rates.

Setting: Ten clinical services at Lausanne University Hospital, Lausanne, Switzerland.

Patients' understanding of blood tests and attitudes to HIV screening in the emergency department of a Swiss teaching hospital: a cross-sectional observational study.

Background: In Switzerland, patients may undergo "blood tests" without being informed what these are screening for. Inadequate doctor-patient communication may result in patient misunderstanding. We examined what patients in the emergency department (ED) believed they had been screened for and explored their attitudes to routine (non-targeted) human immunodeficiency virus (HIV) screening.

Patients with AIDS-defining cancers are not universally screened for HIV: a 10-year retrospective analysis of HIV-testing practices in a Swiss university hospital.

Objectives: Kaposi's sarcoma (KS), invasive cervical carcinoma (ICC) and non-Hodgkin lymphoma (NHL) have been listed as AIDS-defining cancers (ADCs) by the Centers for Disease Control and Prevention since 1993. Despite this, HIV screening is not universally mentioned in ADC treatment guidelines. We examined screening practices at a tertiary centre serving a population where HIV seroprevalence is 0.

HIV testing practices by clinical service before and after revised testing guidelines in a Swiss University Hospital.

Objectives: To determine 1) HIV testing practices in a 1400-bed university hospital where local HIV prevalence is 0.4% and 2) the effect on testing practices of national HIV testing guidelines, revised in March 2010, recommending Physician-Initiated Counselling and Testing (PICT).

Methods: Using 2 hospital databases, we determined the number of HIV tests performed by selected clinical services, and the number of patients tested as a percentage of the number seen per service ('testing rate').

[The diagnosis of brain cholesteatomas].

The authors analyse the results of radiological examination of 65 patients with cholesteatomas of the brain and the value of the main neuroradiological methods in the diagnosis of the disease. The specific features of the CT-picture of these tumors are discussed. The article describes cases of atypical CT isodensity cholesteatomas and cholesteatomas of increased density as well as cases in which a vascular network of the tumor capsule was demonstrated by angiography.

[Changes in the space-time organization of the bioelectrical activity of the human brain on completing the solution of a mental task].

Changes in spatial-temporal organization of human bioelectrical brain activity were studied following formal completion of the process of solution of mental tasks of various complexity. It was shown that in the first seconds after the response, desynchronization took place of cortical potentials, identical to the one observed in the process of solution; at frequencies of alpha- and beta-2-rhythms, predominant decrease took place of parameters of spatial-temporal biopotentials conjunction as compared to the level of calm alertness. Dynamics of recovery of calm alertness EEG characteristics is determined by subjective complexity for the subject of previous activity and by the degree of his confidence in the correctness of the obtained result.

[Mathematical model of normal tissue involvement in gamma teletherapy].

A model of normal tissue injury as a result of exposure to ionizing radiation is based on an assumption that the degree of tissue injury is determined by the degree of destruction by certain critical cells. The dependence of the number of lethal injuries on a single dose is expressed by a trinomial - linear and quadratic parts and a constant, obtained as a result of the processing of experimental data. Quantitative correlations have been obtained for the skin and brain.