Scanning Electron Microscopy Study of Drilling Cuttings in Tomsk Oblast Sites

The research is focused on determining mineralogical composition of drilling cuttings by scanning electron microscope as well as imaging the sample surface of high resolution that allows studying the structural characteristics of the site. In addition, a number of other techniques permit obtaining information on chemical composition of sample in near-surface layers. The study in drilling cuttings by means of scanning microscopy has revealed the presence of titanium, iron, zirconium oxides, iron sulphide, barium sulphate. The former is a mineral that concentrates rare-earth elements, presumably monocyte, as well as uranium silicate, etc. The results obtained confirm the data of previous X-ray structural analysis, i.e. the study samples consist of alumosilicate matrix. Apart from silicon and aluminium oxides, the matrix includes such elements as Na, K, Mg. Such a composition corresponds to rock-forming minerals: quartz, albite, microcline, clinochlore, muscovite, anorthoclase

Hospital Stage of Myocardial Infarction Treatment in 13 Regions of Russian Federation by Results of the International Research

Aim. To describe the characteristics of the patient with MI who is admitted to a hospital and to characterize the main diagnostic and treatment interventions in clinic. Material and methods. This study is observational and the part of big international project. It includes a representative sample of patients with MI admitted to 16 clinics in 13 regions of Russian Federation (Arkhangelsk region, Belgorod region, Bryansk region, Tver region, Saratov region, Rostov region, Samara region, the Republic of Tatarstan, Perm region, Tyumen region, Khanty-Mansiysk Autonomous district, Kemerovo region, Altai region). Patients were selected at random from among those experiencing a MI that were alive on the next morning after hospitalization. Enrollment took place from June 2015 to August 2016. Results. Of 1,128 patients included in the study, 872 were male (77.3%) and 256 females. 21.4% of patients had a previous MI, 8.3% had undergone PCI, and 2.2% CABG. Turning to cardiovascular risk factors, 46.2% of patients smoked prior to hospitalization, 34.6% were obese and 52.1% had a high cholesterol level. Only 40.0% of patients had no contact with the health care system within 12 months before the MI. Every fourth patient (25.1%) had undergone dispensarisation within 12 months before MI, women significantly often than men (33.5% and 22.6%, p < 0.001). Initial revascularization was performed in 73.2% of patients, PCI was the initial revascularization attempt in 49.4% of patients, and PCI with stenting in 46.7%. Conclusion. Patient with a MI in Russian clinics is likely to have had a history of cardiovascular disease, and to have regular contact with the health care system within 12 months before the development of cardiovascular event. We demonstrated the high rates of appropriate MI treatment, without significant gender and age difference (except for thrombolysis), however, there is a reserve for increasing the proportion of patients who are undergoing revascularization

Fluorescence spectrum of a two-level atom driven by a multiple modulated field

We investigate the fluorescence spectrum of a two-level atom driven by a multiple amplitude-modulated field. The driving held is modeled as a polychromatic field composed of a strong central (resonant) component and a large number of symmetrically detuned sideband fields displaced from the central component by integer multiples of a constant detuning. Spectra obtained here differ qualitatively from those observed for a single pair of modulating fields [B. Blind, P.R. Fontana, and P. Thomann, J. Phys. B 13, 2717 (1980)]. In the case of a small number of the modulating fields, a multipeaked spectrum is obtained with the spectral features located at fixed frequencies that are independent of the number of modulating fields and their Rabi frequencies. As the number of the modulating fields increases, the spectrum ultimately evolves to the well-known Mellow triplet with the sidebands shifted from the central component by an effective Rabi frequency whose magnitude depends on the initial relative phases of the components of the driving held. For equal relative phases, the effective Rabi frequency of the driving field can be reduced to zero resulting in the disappearance of fluorescence spectrum, i.e., the atom can stop interacting with the field. When the central component and the modulating fields are 180 degrees out of phase, the spectrum retains its triplet structure with the sidebands located at frequencies equal to the sum of the Rabi frequencies of the component of the driving field. Moreover, we shaw that the frequency of spontaneous emission can be controlled and switched from one frequency to another when the Rabi frequency or initial phase of the modulating fields are varied