Lithological features of coal-overlying accumulations of Upper Vasiugan formation of Kazan oil-gas-condensate field

The study of secondary transformations of accumulation has to be an integral component of modern lithological study because it allows understanding all the features of stages of processes that form accumulation and transform sedimetary rocks. This is essential in prediction of areas with better reservoir properties. In order to find features of reservoir rocks and its influence on reservoir properties the author conducted a detailed lithological study of accumulation of coal-overlying set of Upper Vasiugan formation of Kazan field. In terms of regional tectonics the field is located in central part of Kazan dome dedicated to local upheaval that is located on the east part of Niurol depression. As an object to study it was decided to choose deposits of coal-overlying set of Upper Vasiugan formation which cross-section includes sand layers and . This paper presents results of the study of composition of rock-forming and cementing matter of productive layers and of Kazan oil-gas-condensate field (Tomsk region). Studies showed that nature of reservoir properties of silty-sand rocks are mainly determined not only by sedimentation conditions, but nature of post-sedimentary changes as well. During the study of rock thin sections diagenetic and katagenetic indicators of lithogenesis are found. In order to determine causes of irregular porosity and permeability distribution along a thin section dependency of these properties on both primary (sedimentation) and secondary (post-sedimentation) factors were found. To find the answer for this challenge the author determined pair correlation coefficients and built diagrams. As a result of the study parameters that improve and deteriorate reservoir properties of sandstones of Kazan deposits were identified

Geochemistry of impurity elements of Upper Jurassic deposits of Kazan fields group

Both sandstones and fine-grain clastic debris have integrated information about factors controlling its formation processes. This information is contained in litho-geochemical characteristics. Obtained information complement and specify results of lithologic research carried by conventional methods. The subject of the research are deposits of Kazan oil-gas-condensate field and Boltnoe oil field that are located in Parabel territory of Tomsk region. In terms of structure Kazan and Bolotnoe fields are dedicated to dome uplifts of the same names and located in south-east part of Niurolsk depression within the border of 2nd class positive structure Kalgachskii Mesozoic uplift. Geological structure of the field is formed by metamorphosed basement rocks and siliciclastic deposits of different composition of Mesozoic-Cenozoic platform mantle. Productive deposits of Upper Jurassic are the field of interest. Upper series of Jurassic deposits on studied area is presented by Vasiugan, Georgiev and Bazhenov formations that are drilled and characterized in details by core. Obtained data proved the rule of change of rare earth elements composition between different conditions of marginal-marine line and showed tendency of some elements to grow and decrease of other going out from margin. Sedimentary rocks of south-east part of Niurolsk depression are differentiated in geochemical and mineral-petrographical compositions. Both are presented by wide range of variety. With use of obtained geochemical data and evaluation of indicators determined environments of sedimentation are proved. Fundamental parameters of sedimentary rocks such as composition and proximity of a source, salinity and paleoclimates are determined

Impact of Controlling the Site Distribution of Al Atoms on Catalytic Properties in Ferrierite-Type Zeolites

Zeolites with the ferrierite (FER) topology are synthesized using a combination of tetramethylammonium (TMA) cations with differently sized cyclic amines (pyrrolidine (Pyr), hexamethyleneimine (HMI), and 1,4- diazabicyclo[2.2.2]octane (DAB)). Using these organic structure-directing agents (SDAs), low Si/Al ratios and concentrated synthesis mixtures favor the crystallization of FER materials. Increasing the size of the cyclic amine or decreasing the aluminum content leads to the crystallization of other phases or the creation of excessive amounts of connectivity defects. TMA cations play a decisive role in the synthesis of the FER materials, and their presence allows the use of HMI to synthesize FER. Proton MAS NMR is used to quantify the accessibility of pyridine to acid sites in these FER samples, where it is found that the FER + HMI + TMA sample contains only 27% acid sites in the 8-MR channels, whereas FER + Pyr and FER + Pyr + TMA contain 89% and 84%, respectively. The constraint index (CI) test and the carbonylation of dimethyl ether (DME) with carbon monoxide are used as probe reactions to evaluate how changes in the aluminum distribution in these FER samples affect their catalytic behavior. Results show that the use of Pyr as an SDA results in the selective population of acid sites in the 8-MR channels, whereas the use of HMI generates FER zeolites with an increased concentration of acid sites in the 10-MR channels

Development of Competent Mathematical Speech of Students at Technical University

The development of literate speech of students, including mathematics, as one of the areas of communicative component of learning outcomes, is a requirement of higher education standards. The authors have analysed the educational standards for the content of the requirements to the general education of a graduate related to the development of literate speech, as well as the works of domestic and foreign teachers-researchers on the development of mathematical literacy. The literature review and the authors’ own experience of teaching mathematics to engineering students at technical University showed that the ability of students to use logically correct, reasoned and clear oral and written speech is developed insufficiently to apply the mathematical apparatus in their educational and professional activities. The authors have identified the criteria of competent speech and theoretical and methodological conditions of the educational process which enable the ensure the organizational and methodological support of educational process aimed at the development of competent mathematical speech of students. The main applied methods of teaching are advanced self-directed work of students, lecture-discussion, mutual dictation, interchange of tasks, interchange of themes, study of the text fragments, repetition training-game, etc. The effectiveness of educational activities is achieved through the use of active and interactive forms of teaching. The prepared organizational and methodological support of teaching, the systemic educational work allow students to improve their speech skills and skills of active use of mathematical language as a universal language of science, to develop logical, algorithmic and mathematical thinking, the ability to apply methods of mathematical analysis and modeling, theoretical and experimental research in solving professional problems

Time-frequency dynamics of spike-wave discharges in absence epilepsy patients using wavelet transform

Contains fulltext : 56879.pdf (publisher's version ) (Closed access)1 p

Some peculiarities of time-frequency dynamics of spike-wave discharges in humans and rats

Contains fulltext : 56663.pdf (publisher's version ) (Closed access)Objective - Time–frequency dynamics of spike–wave discharges (SWDs) were investigated in patients with absence seizures and in WAG/Rij rats, a genetic model of absence epilepsy using a specially developed wavelet transform. Methods - Two types of SWDs were analyzed in both species: the most frequently occurring discharges (of minimal 3.6–4.0 s or more) and shorter ones recorded from various cortical regions. Results - The more prolonged discharges had two phases: during the initial part (from tenth of seconds to 1 s) of the seizure the frequency decreased quickly from 5 to 3.5 Hz in patients and from about 15 to 10 Hz in rats. A slower frequency decrease with periodical fluctuations was observed in both species during the second part of the discharge: the frequency decreased towards the end of the discharge to 3 Hz in patients and to 6–7 Hz in rats. The frequency of the short discharges decreased fast during the whole discharge: from 5 to 2–2.5 Hz and from about 15 to 5 Hz in patients and rats, respectively. Conclusions - Comparison of data obtained in patients with typical absence epilepsy and WAG/Rij rats with genetic absence epilepsy revealed that the time–frequency dynamics of SWDs had similar properties but in a different frequency range. Significance - The study of time–frequency dynamics using this specially developed wavelet transform revealed two different types of SWDs, which most likely represent different dynamics in the cortico-thalamo-cortical loop during shorter and more prolonged discharges.8 p

Coexistence of two types of nonconvulsive epilepsy in patients and genetic animal model (WAG/Rij rats) [in Russian]

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Investigation of Phase Shifts Using AUC Diagrams: Application to Differential Diagnosis of Parkinson’s Disease and Essential Tremor

This study was motivated by the well-known problem of the differential diagnosis of Parkinson’s disease and essential tremor using the phase shift between the tremor signals in the antagonist muscles of patients. Different phase shifts are typical for different diseases; however, it remains unclear how this parameter can be used for clinical diagnosis. Neurophysiological papers have reported different estimations of the accuracy of this parameter, which varies from insufficient to 100%. To address this issue, we developed special types of area under the ROC curve (AUC) diagrams and used them to analyze the phase shift. Different phase estimations, including the Hilbert instantaneous phase and the cross-wavelet spectrum mean phase, were applied. The results of the investigation of the clinical data revealed several regularities with opposite directions in the phase shift of the electromyographic signals in patients with Parkinson’s disease and essential tremor. The detected regularities provide insights into the contradictory results reported in the literature. Moreover, the developed AUC diagrams show the potential for the investigation of neurodegenerative diseases related to the hyperkinetic movements of the extremities and the creation of high-accuracy methods of clinical diagnosis