Petrophysical zoning elements of Chertovo Koryto gold-ore deposit (Patom Upland, Eastern Siberia)

The paper considers magnetic susceptibility (chi) and electrode potentials (EP) of rocks in the Chertovo Koryto deposit. Carbon-bearing substance is found in all the studied samples, but in some cases, this substance supplies EP (-150 ± -400 mV). In these samples [chi] rarely exceeds 40·10{-5} SI units, while, in other samples [chi] is 8-10 (up to 30) times higher. Less intensive EP (-20 ± -240 mV) is furnished due to the sulfides in this deposit. Rocks with polarized carbon-bearing substance do not contain magnetic pyrrhotine and are negative linear EP anomalies. Rocks in which carbon-bearing substance is associated with pyrrhotine are revealed as magnetic anomalies. The adjacent rocks determine petrophysical zoning of the Chertovo Koryto deposit. The combination of negative linear EP anomalies and magnetic anomalies is a potential indicator and can define the multi-stage formation of the deposit itself

Розробка методу визначення динамічних параметрів оператора мобільної пожежної установки на базі сігвею

A method for determining the dynamic parameters of the operator of a mobile fire engine based on a segway, which fully characterize its dynamic properties – delay time and inertia was developed. The development of the method includes four stages. At the first stage, the problem of obtaining analytical relationships for determining the dynamic parameters of the operator is solved. These relationships include the frequency characteristics of the operator at a fixed frequency and its static parameter. At the second stage, the choice of a fixed frequency is substantiated using a criterion that minimizes errors in determining the dynamic parameters. It is shown that the fixed frequency for the characteristic parameters of the operator does not exceed 0.5 Hz. The third stage includes substantiation of the procedure for determining the frequency characteristics of the operator and its static parameter. The frequency characteristics of the operator at a fixed frequency and its static parameter are determined numerically. This procedure is based on using the data obtained by measuring the values of the operator’s transfer function at fixed time intervals. To obtain data, an interactive analog engine is used, which can also perform the functions of a simulator. The time intervals are chosen according to the Kotelnikov-Nyquist-Shannon theorem. At the last stage, the procedure for determining the dynamic parameters of the operator of a segway-based mobile fire engine is described. It is shown that the error in determining the dynamic parameters of the operator of a mobile fire engine does not exceed 9.0 %, if the error in determining its frequency characteristics at a frequency of 2.5 s–1 does not exceed 2.0 %Применительно к оператору мобильной пожарной установки на базе cигвея разработан метод определения его динамических параметров, которые полностью характеризуют его динамические свойства – время запаздывания и инерционность. Разработка метода включает четыре этапа. На первом этапе решается задача по получению аналитических зависимостей для определения динамических параметров оператора. Эти зависимости включают значение частотных характеристик оператора на фиксированной частоте и его статический параметр. На втором этапе обосновывается выбор фиксированной частоты, осуществляемый с использованием критерия, который минимизирует величины погрешностей определения динамических параметров. Показано, что величина фиксированной частоты для характерных параметров оператора не превышает 0,5 Гц. Третий этап включает обоснование процедуры получения значений частотных характеристик оператора и его статического параметра. Частотные характеристики оператора на фиксированной частоте и величина его статического параметра получены численным путем. Эта процедура основана на использовании массива данных, который получен путем измерения значений переходной функции оператора через фиксированные интервалы времени. Для получения массива данных используется интерактивная установка-аналог, которая может выполнять и функции тренажера. Интервалы времени выбираются согласно теореме Котельникова - Найквиста - Шеннона. На последнем этапе дается описание процедуры определения динамических параметров оператора мобильной пожарной установки на базе сигвея. Показано, что погрешность определения динамических параметров оператора мобильной пожарной установки не превышает 9,0 %, если погрешность определения его частотных характеристик на частоте 2,5 с-1 не превышает 2,0 %Стосовно до оператора мобільної пожежної установки на базі сігвею розроблено метод визначення його динамічних параметрів, які повністю характеризують його динамічні властивості – час запізнення та інерційність. Розробка методу включає чотири етапи. На першому етапі вирішується задача по одержанню аналітичних залежностей для визначення динамічних параметрів оператора. Ці залежності включають значення частотних характеристик оператора на фіксованій частоті та його статичний параметр. На другому етапі обґрунтовується вибір фіксованої частоти, що здійснюється із використанням критерію, який мінімізує величини похибок визначення динамічних параметрів. Показано, що величина фіксованої частоти для характерних параметрів оператора не перевищує 0,5 Гц. Третій етап включає обґрунтування процедури одержання значень частотних характеристик оператора та його статичного параметра. Частотні характеристики оператора на фіксованій частоті та величина його статичного параметра одержані чисельним шляхом. Ця процедура основана на використання масиву даних, який одержаний шляхом вимірювань значень перехідної функції оператора через фіксовані інтервали часу. Для одержання масиву даних використовується інтерактивна установка-аналог, яка може виконувати функції тренажера. Інтервали часу обираються згідно до теореми Котельнікова – Найквіста – Шеннона. На останньому етапі надається опис процедури визначення динамічних параметрів оператора мобільної пожежної установки на базі сігвею. Показано, що похибка визначення динамічних параметрів оператора мобільної пожежної установки не перевищує 9,0 %, якщо похибка визначення його частотних характеристик на частоті 2,5 с-1 не перевищує 2,0 

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

Computer Modeling and Analysis of the Energy-Power Process Parameters of the Combined Machining of Alloys Al-Mg System

Article shows the results of studies of the process of combined rolling-extruding of an alloy of the Al-Mg system (AlMg6) under various temperature-speed and deformation conditions. Calculations shows that with increasing metal temperature at the entrance to the deformation center, the values ​​of the forces on the rolls and the die decrease, the increase in drawing leads to an increase in the values ​​of forces on both the rolls and the die, and an increase in the deformation rate leads to hardening of the metal and increasing energy parameters of the process of combined machining. However, the maximum extruding force on the combined machining units is 5-10 times lower than the efforts to obtain the same press products on hydraulic presses. A computer model of the combined machining process created with the help of the DEFORM 3D complex, the analysis of the metal flow is made, the temperature distribution of the metal over the section of the workpiece invstigated when producing round bars of different diameters. Shaping of the metal corresponds to the data of experimental and theoretical studies, while the deformation center has a characteristic appearance, including the gripping zones of the workpiece and its rolling, repressing and extrusion. The peculiarity for this alloy is that with a drawing ratio of μ = 3.7 and a strain rate of ξ = 0.78 s-1, the steady extruding process takes place without completely filling the deformation zone from the side of the roll with a protrusion. An increase in drawing ratio or strain rate leads to a decrease in the contactless zone or to its absence. The change in metal temperature also depends on the presence of a contactless zone, which contributes to an increase in heat transfer from the billet to the rolls. The results of the research were used to develop the technology for the production of welding wire from Al-Mg system alloys

Investigation of construction and parameters of the combined system for developing quartz slope deposit

The relevance of the work is in the issue of reducing losses in the bowels during development of vein No. 175 of the unique Kyshtym deposit of quartz, which is practically the only stable source of raw materials for innovative sectors of the economy. The applied chamber mining with the abandonment of ribbon pillars in the bowels provides a loss level of only 28 %, which is unacceptable for high-grade quartz. The use of bookmarked systems is unacceptable due to deterioration of the quality of quartz due to the entry of chemical impurities, and the systems with sub-floor caving because of great dilution and loss of ore. The technology aimed at reducing losses through the combination of development systems of various classes can solve the problem of increasing efficiency. The aim of the work is to substantiate the design and parameters of the combined mining system of slope field of medium capacity, providing the increase in the efficiency of underground technology and reducing losses of high-grade quartz in the subsoil. Research methods: a comprehensive research method, including analysis and generalization of the theory and experience in working out inclined ore bodies, economic and mathematical modeling of options and optimization of technology parameters, functional-factor regression with approximation of established dependencies of extraction parameters, technical and economic analysis of the experimental results. Results. The authors have systematized the variants of the combined mining system of slope deposits of medium capacity according to controllable factors that have the greatest effect on ore extraction parameters, form, condition and method of working out the interlock chamber, determined, respectively, by the stability of the hanging rocks, order of the extinguished chamber space. The authors developed the technique for determining extraction rates under a combined system for development of slope deposits of medium capacity, which takes into account the nature of the output of the interlocking ore under the cantilever arm and the caving rocks flowing from the adjacent block. The dependencies of extraction and efficiency of the combined development system on the thickness and angle of incidence of the ore body and on chamber width, which vary in the range of 4-20 m, 20-40 C and 18-26 m, respectively, were determined. Conclusions. The results of the study made it possible to determine the optimality of the variant of the combined mining system by forming a trapezoidal, mass collapse and ore release under the rock console through the bottom of the chamber

Expansion of the alien East Asian river prawn Macrobrachium nipponense (De Haan, 1849) in southwestern Ukraine and assessment of its commercial usage prospects

At this time East Asian river prawn Macrobrachium nipponense is present almost everywhere in the lower reaches of the Danube and Dniester basins, in the Danube-Dniester interfluves and water bodies to the east of the Dniester. Successful adaptation and favorable climatic conditions in recent years have provided a significant increase in the East Asian river prawn populations in the Danube and Dniester. High growth rates of M. nipponense have been observed in the Danube and Dniester. In these river basins, higher values of maximum body length of the prawn (males 115 mm, females 87 mm) than those recorded in the native range water bodies and the cooler water bodies of thermal power plants during introduction were recorded. In small shallow brackish-water reservoirs of the region (PSU 1.5–6.0) the growth rate of M. nipponense is significantly lower than in the freshwater Danube and Dniester deltaic zones. Female East Asian river prawn in such water bodies mature at a much smaller size. The egg-laying period of female M. nipponense in the Danube lasts from June to October. The peak of egg laying is observed in July and August. There have been reported cases of M. nipponense being affected by crustacean burn-spot disease. The prospect of organizing the fishing of M. nipponense in the Danube River has been determined. It is necessary to continue research to increase selectivity of fishing gears, determination of optimal terms of fishing, and places of installation of fishing gears

Developing A Method for Determining the Dynamic Parameters of the Operator of A Mobile Fire Engine Based on A Segway

A method for determining the dynamic parameters of the operator of a mobile fire engine based on a segway, which fully characterize its dynamic properties – delay time and inertia was developed. The development of the method includes four stages. At the first stage, the problem of obtaining analytical relationships for determining the dynamic parameters of the operator is solved. These relationships include the frequency characteristics of the operator at a fixed frequency and its static parameter. At the second stage, the choice of a fixed frequency is substantiated using a criterion that minimizes errors in determining the dynamic parameters. It is shown that the fixed frequency for the characteristic parameters of the operator does not exceed 0.5 Hz. The third stage includes substantiation of the procedure for determining the frequency characteristics of the operator and its static parameter. The frequency characteristics of the operator at a fixed frequency and its static parameter are determined numerically. This procedure is based on using the data obtained by measuring the values of the operator's transfer function at fixed time intervals. To obtain data, an interactive analog engine is used, which can also perform the functions of a simulator. The time intervals are chosen according to the Kotelnikov-Nyquist-Shannon theorem. At the last stage, the procedure for determining the dynamic parameters of the operator of a segway-based mobile fire engine is described. It is shown that the error in determining the dynamic parameters of the operator of a mobile fire engine does not exceed 9.0 %, if the error in determining its frequency characteristics at a frequency of 2.5 s–1 does not exceed 2.0