Absence of room temperature ferromagnetism in bulk Mn-doped ZnO

Structural and magnetic properties have been studied for polycrystalline Zn_1-xMn_xO (x=0.02, 0.03, 0.05). Low-temperature (~500 oC) synthesis leaves unreacted starting ZnO and manganese oxides. Contrary to a recent report, no bulk ferromagnetism was observed for single-phase materials synthesized in air at temperatures above 900 oC. Single-phase samples show paramagnetic Curie-Weiss behavior.Comment: Accepted for publication in J. Appl. Phys., RevTeX, 3 pages, 4 figure

Integrated assessment of the environmental hazard level of technologies of drilling and blasting operations with using emulsion explosives in quarries

Purpose. Adaptation of the “unified method of quantitative and qualitative assessment of the level of environmental hazard of the operation of industrial enterprises, facilities and introduced technologies in the field of production and ecology” to the technologies of drilling and blasting operations in quarries for extraction of ore and nonmetallic materials with the use of various types of explosives. The methods. They are based on a heuristic evaluation of the impact of priority man-made factors of the technologies used according to the 4-point scale (0, 1, 2, 3), and then – of the complex level of their environmental hazard – according to the total 15-point scale, evenly divided into three qual-itative levels. Findings. The identification of types and sources of environmental hazard for natural environments (atmosphere, hydrosphere, lithosphere, soils and biota) was performed when using emulsion and TNT-containing explosives during drilling and blasting operations in quarries. The intensity, perio-dicity and consequences of various accompanying man-made factors were taken as the criteria of influence of dangerous impact of technological processes on the condition of the above natural en-vironments. It was found that the integrated level of the environmental hazard of man-made impacts of drilling and blasting operations using emulsion explosives was 2.33, in other words, it was “low”. When using TNT-containing explosives it was 5.00, i.e. appeared on the boundary of the first and the second ranges, where the “low” hazard level changes to “moderate”. This is an evi-dence of a higher (more than 2 times) environmental efficiency of using emulsion explosives com-pared to the use of TNT-containing explosives. The originality. The system of identification and management of environmental and technology-related risks under conditions of extraction of ore and nonmetallic materials in quarries by the drill and blast method was proposed, whereupon an integrated assessment of the level of environmental hazard of mining enterprises is proposed to be defined as a sum of average grade points (for each of the man-made factors) according to quantitative-qualitative scale. Practical implications. The developed methods allow determining with a sufficient degree of reli-ability the level of environmental hazard of existing technologies of drilling and blasting operations and substantiating expediency of change-over to emulsion explosive materials

Effect of space flight on sodium, copper, manganese and magnesium content in the skeletal bones

Sodium content decreased in the human skeletal bones and rose in the rat bones following space flight. In man copper content rose in the femoral bone and decreased in the vertebral body and the sternum, but was unchanged in the rest of the bones. Magnesium content was decreased in the femoral bone and the sternum, and in the vertebrae, but remained unchanged in the rest of the bones. Possible mechanisms of the changes detected are discussed

On the Thermal Instability in a Contracting Gas Cloud and Formation of a Bound Cluster

We perform linear analysis of thermal instability in a contracting large cloud filled with warm HI gas and investigate the effect of metallicity and radiation flux. When the cloud reaches critical density n_f, the cloud fragments into cool, dense condensations because of thermal instability. For a lower metallicity gas cloud, the value of n_f is high. Collision between condensations will produce self-gravitating clumps and stars thereafter. From the result of calculation, we suggest that high star formation efficiency and bound cluster formation are realized in low-metallicity and/or strong-radiation environments.Comment: 7 pages, including 7 figures, LaTeX2e(emulateapj5.sty) To appear in ApJ, Jun 10, 200

Link of apoptosis level in the primary tumor at early stages of non-small cell lung cancer with efficacy of adjuvant polychemotherapy.

One of the important questions in modern oncology is treatment of patients with early stages of non-small cell lung cancer (NSCLC). Adjuvant polychemotherapy (APCT) can help to improve prognosis after operation. In modern literature there is no unified opinion as for patients in need of adjuvant chemotherapy. However, now investigators indicate to necessity to use molecular markers for individualization of APCT. The aim of our study was to assess correlation between apoptos level in primary tumor in patients with early stages of NSCLC with effectiveness of APCT. Study was conducted by the chair of oncology of Zaporozhye state medical university since June 2008 to Dec 2012. 254 patients with I-II stages of non-small cell lung cancer were included in the study. Expres­sion of p53 was evaluated as percent of positively stained nucleus tumor cells in general population. More than 25% of positively stained nucleus tumor cells meant high p53 expression. Results: We performed assessment of apoptosis level with the help of p53 expression in 220 patients. No prognostic significance of p53 level expression in patients with early stages of non-small cell lung cancer (р=0,65) was revealed. There was significant correlation between age (р=0,039), sex (р=0,009) and apoptosis level in primary tumor in patients with early stages of NSCLC. Worse survival was noted in group of patients with low p53 expressions after adjuvant chemotherapy (р=0,009). But in patients with high level of p53 expression adjuvant chemotherapy significantly increased survival (p<0,001). So, adjuvant chemotherapy in patients with I-II stages of NSCLC is necessary to be carried out in cases of high p53 expression level

Clinical case of chemoresistant tuberculosis in the patient with tuberous sclerosis: difficulties of diagnosis, features of the course and treatment.

In the practical activities of a modern doctor, significant difficulties are noted in the diagnostics and proper management of patients with hereditary diseases due to the limited coverage of the population by genetic researches. For a long time, the patients with a variety of complaints are observed by doctors of various specialties, and the therapy often has little effect due to a lack of understanding of the true causes of pathological changes. The situation is complicated by case of a combined course of a hereditarily caused disease and some other disease of an infectious, non-infectious or tumor nature. The aim of the research was to study the characteristics of clinical manifestations, course of tuberculosis with resistance to anti-TB drugs in a patient with a rare hereditary disease from the group of phacomotoses - Bourneville-Pringle disease or tuberous sclerosis. This disease has a wide range of clinical manifestations, accompanied with the development of benign neoplasms in various organs and systems, damages to the skin, brain, organs of vision, lungs, kidneys, heart, as well as the musculoskeletal and endocrine system. It leads to development of various infectious and non-infectious pathologies in these organs. The article covers a 4-year period of observation of a young patient with late diagnosed tuberous sclerosis, suffering from pulmonary tuberculosis and tuberculosis of urinary system, includes the initial diagnosis of a specific disease, the course, the dynamics against received treatment and the development of relapse with the formation of resistance to anti-TB drugs. The difficulties in the management of tuberculosis in this patient were in the detection of numerous neoplasms and changes in the internal organs, in particular in the kidneys and lungs, which characterized tuberous sclerosis, on the one hand this contributed to untimely diagnosis of tuberculosis, and on the other hand – worsening the course and the progression of a specific process, as well as an unfavourable prognosis for recovery

Hydraulics and heat transfer in the IFMIF liquid lithium target: CFD calculations

CFD (Computational fluid dynamics) calculation turns out to be a good approximation to the real behavior of the lithium (Li) flow of the target of the international fusion materials irradiation facility (IFMIF). A three-dimensional (3D) modelling of the IFMIF design Li target assembly, made with the CFD commercial code ANSYS-FLUENT has been carried out. The simulation by a structural mesh is focused on the thermal-hydraulic analysis inside the Li jet flow. For, this purpose, the two deuteron beams energy deposition profile is modelled as an energy source term inside the volume of liquid affected. Turbulence is estimated using the RNG k– model, and a surface-tracking technique applied to a fixed Eulerian mesh called volume of fluid (VOF) is used to determine the position of the free surface. Calculations varying the jet velocity from a range of 10–20 m/s, show that maximum calculated temperatures are still below the lithium's boiling point, due to the increase of the pressure induced by centrifugal forc

Labor mobility in the system of employment strategies of the region’s population

The issue consideration of labor mobility as an employment strategy is relevant, because it is based on a growing understanding of the importance of labor mobility for the economic development of the country and its regions. The study purpose is to examine the place of labor mobility in the employment strategy of the population. The objectives are to study approaches to the labor mobility definition as an employment strategy, to analyze regional specifics in the labor mobility of the population, to determine the place of labor mobility in the employment strategy of the Tyumen region. General scientific, statistical and sociological methods were used in the research. The main study results are the identification of an increasing trend in the transformation of the population employment strategy and its reflection on the processes of labor mobility, grouped around changes in production and economic conditions. This provision defines not only the basis for the development of scientific discussion, but also the directions for further study of such issue