A Wireless LC Sensor Coated with Ba0.9Bi0.066TiO3 for Measuring Temperature

This paper presents a passive LC wireless sensor for measuring temperature. The sensor is designed as a parallel connection of a spiral inductor and an interdigitated capacitor and it was fabricated in a conductive layer using LTCC (Low Temperature Co-fired Ceramic) technology. The inderdigitated capacitor electrodes were coated with a thin film of bismuth doped barium titanate (Ba0.9Bi0.066TiO3), whose permittivity changes with temperature, which directly induces changes in the capacitance of the interdigitated capacitor and consequently changes the resonant frequency of the sensor. The measurements of S-parameter of the sensor were performed using a Vector Network Analyzer (E5071B, Agilent Technologies, Santa Clara, CA, USA), whose port was connected to the antenna coil that was placed around the sensor in order to be able to wirelessly detect temperature, in the temperature range from 25 degrees C to 165 degrees C

Анализ эффективности применения технологии кластерного гидравлического разрыва пласта в низкопроницаемых коллекторах нефтяных месторождений

Объектом исследования является технология кластерного ГРП. Цель исследования – анализ эффективности применения технологии кластерного ГРП в низкопроницаемых коллекторах нефтяных месторождений. В процессе исследования был подробно рассмотрен механизм проведения кластерного ГРП. Проведен анализ геологических условий применения данной технологии. Изучен процесс подбора рабочих агентов кластерного ГРП. Выполнен анализ технологического процесса кластерного ГРП на нефтяных месторождениях. В результате исследования выявлен положительный эффект кластерного ГРП и разработаны рекомендации по развитию данной технологииThe object of the study is the technology of cluster hydraulic fracturing. The purpose of the study is to analyze the effectiveness of the application of cluster hydraulic fracturing technology in low-permeable reservoirs of oil fields. In the course of the study, the mechanism of cluster hydraulic fracturing was considered in detail. The analysis of geological conditions of application of this technology is carried out. The process of selecting working agents for cluster hydraulic fracturing is studied. The analysis of the technological process of cluster hydraulic fracturing in oil fields is carried out. The study revealed the positive effect of cluster hydraulic fracturing and developed recommendations for the development of this technolog

Reperfusion therapy for ST elevation acute myocardial infarction 2010/2011: current status in 37 ESC countries

Aims Primary percutaneous coronary intervention (PPCI) is the preferred reperfusion therapy in ST-elevation myocardial infarction (STEMI). We conducted this study to evaluate the contemporary status on the use and type of reperfusion therapy in patients admitted with STEMI in the European Society of Cardiology (ESC) member countries. Methods and results A cross-sectional descriptive study based on aggregated country-level data on the use of reperfusion therapy in patients admitted with STEMI during 2010 or 2011. Thirty-seven ESC countries were able to provide data from existing national or regional registries. In countries where no such registries exist, data were based on best expert estimates. Data were collected on the use of STEMI reperfusion treatment and mortality, the numbers of cardiologists, and the availability of PPCI facilities in each country. Our survey provides a brief data summary of the degree of variation in reperfusion therapy across Europe. The number of PPCI procedures varied between countries, ranging from 23 to 884 per million inhabitants. Primary percutaneous coronary intervention and thrombolysis were the dominant reperfusion strategy in 33 and 4 countries, respectively. The mean population served by a single PPCI centre with a 24-h service 7 days a week ranged from 31 300 inhabitants per centre to 6 533 000 inhabitants per centre. Twenty-seven of the total 37 countries participated in a former survey from 2007, and major increases in PPCI utilization were observed in 13 of these countries. Conclusion Large variations in reperfusion treatment are still present across Europe. Countries in Eastern and Southern Europe reported that a substantial number of STEMI patients are not receiving any reperfusion therapy. Implementation of the best reperfusion therapy as recommended in the guidelines should be encourage

Iscador Qu inhibits doxorubicin-induced senescence of MCF7 cells

Chemotherapy in patients with inoperable or advanced breast cancer inevitably results in low-dose exposure of tumor-cell subset and senescence. Metabolically active senescent cells secrete multiple tumor promoting factors making their elimination a therapeutic priority. Viscum album is one of the most widely used alternative anti-cancer medicines facilitating chemotherapy tolerance of breast cancer patients. The aim of this study was to model and investigate how Viscum album extracts execute additive anti-tumor activity with low-dose Dox using ER + MCF7 breast cancer cells. We report that cotreatment of MCF7 with Viscum album and Dox abrogates G2/M cycle arrest replacing senescence with intrinsic apoptotic program. Mechanistically, this switch was associated with down-regulation of p21, p53/p73 as well as Erk1/2 and p38 activation. Our findings, therefore, identify a novel mechanistic axis of additive antitumor activity of Viscum album and low dose-Dox. In conclusion, ER + breast cancer patients may benefit from addition of Viscum album to low-dose Dox chemotherapy due to suppression of cancer cell senescence and induction of apoptosis

Conductivity of doped LaGaO3 prepared by citrate sol-gel method

Lanthanum-gallate powders (LSGM), with composition La1-xSrxGa1-yMgyO3-δ (0 ≤ x, y ≤ 0.2), were prepared using citrate solgel method. As-synthesized powders were calcined at 900°C, uniaxially pressed and sintered in air at different temperatures (up to 1450°C). Sintered samples contained cubic perovskite phase, while only pure LaGaO3 had small amount of the secondary orthorhombic phase. Sintering temperature of 1450°C with dwell time of 2 hours was sufficient to obtain samples with densities higher than 95% TD, with exception of pure LaGaO3. Impedance spectroscopy measurements confirmed that obtained LSGM ceramics have total conductivity an order of magnitude higher than zirconiabased electrolyte. Thus, citrate sol-gel method used in this work is a promising synthesis route for production of the doped lanthanum-gallate for intermediate temperature solid oxide fuel cells