Обоснование способов локализации взрывов на предприятиях

Объектом выпускной квалификационной работы является ООО "Кокс – Майнинг" Шахта "Бутовская". Цель выпускной квалификационной работы: провести анализ существующих способов предупреждения и локализации взрывов на шахте . В результате выполнения выпускной квалификационной работы выполнен анализ водяных, сланцевых и автоматических заслонов, была рассмотрена характеристика пластов по метану, опасность образования скоплений горючих газов и взрывов скопления метана.The object of final qualifying work is LLC "Cox - Mining" Mine "Butovskaya". The purpose of final qualifying work: an analysis of the existing methods of prevention and localization of explosions at the mine. As a result of final qualifying work the analysis of water, shale and automatic barriers, characteristic layers of methane, a risk of accumulations of combustible gases and methane concentrations of explosions has been considered

Interinstitutional variations in mode of birth after a previous caesarean section : a cross-sectional study in six German hospitals

Aims: Regional and interinstitutional variations have been recognized in the increasing incidence of caesarean section. Modes of birth after previous caesarean section vary widely, ranging from elective repeat caesarean section (ERCS) and unplanned repeat caesarean section (URCS) after trial of labour to vaginal birth after caesarean section (VBAC). This study describes interinstitutional variations in mode of birth after previous caesarean section in relation to regional indicators in Germany. Material and methods: A cross-sectional study using the birth registers of six maternity units (n=12,060) in five different German states (n=370,209). Indicators were tested by χ2 and relative deviations from regional values were expressed as relative risks and 95% confidence intervals. Results: The percentages of women in the six units with previous caesarean section ranged from 11.9% to 15.9% (P=0.002). VBAC was planned for 36.0% to 49.8% (P=0.003) of these women, but actually completed in only 26.2% to 32.8% (P=0.66). Depending on the indicator, the units studied deviated from the regional data by up to 32% [relative risk 0.68 (0.47–0.97)] in respect of completed VBAC among all initiated VBAC. Conclusions: There is substantial interinstitutional variation in mode of birth following previous caesarean section. This variation is in addition to regional patterns

Influence of motivation on control hierarchy in the human frontal cortex.

The frontal cortex mediates cognitive control and motivation to shape human behavior. It is generally observed that medial frontal areas are involved in motivational aspects of behavior, whereas lateral frontal regions are involved in cognitive control. Recent models of cognitive control suggest a rostro-caudal gradient in lateral frontal regions, such that progressively more rostral (anterior) regions process more complex aspects of cognitive control. How motivation influences such a control hierarchy is still under debate. Although some researchers argue that both systems work in parallel, others argue in favor of an interaction between motivation and cognitive control. In the latter case it is yet unclear how motivation would affect the different levels of the control hierarchy. This was investigated in the present functional MRI study applying different levels of cognitive control under different motivational states (low vs high reward anticipation). Three levels of cognitive control were tested by varying rule complexity: stimulus-response mapping (low-level), flexible task updating (mid-level), and sustained cue-task associations (high-level). We found an interaction between levels of cognitive control and motivation in medial and lateral frontal subregions. Specifically, flexible updating (mid-level of control) showed the strongest beneficial effect of reward and only this level exhibited functional coupling between dopamine-rich midbrain regions and the lateral frontal cortex. These findings suggest that motivation differentially affects the levels of a control hierarchy, influencing recruitment of frontal cortical control regions depending on specific task demands

Influence of Motivation on Control Hierarchy in the Human Frontal Cortex

The frontal cortex mediates cognitive control and motivation to shape human behavior. It is generally observed that medial frontal areas are involved in motivational aspects of behavior, whereas lateral frontal regions are involved in cognitive control. Recent models of cognitive control suggest a rostro-caudal gradient in lateral frontal regions, such that progressively more rostral (anterior) regions process more complex aspects of cognitive control. How motivation influences such a control hierarchy is still under debate. Although some researchers argue that both systems work in parallel, others argue in favor of an interaction between motivation and cognitive control. In the latter case it is yet unclear how motivation would affect the different levels of the control hierarchy. This was investigated in the present functional MRI study applying different levels of cognitive control under different motivational states (low vs high reward anticipation). Three levels of cognitive control were tested by varying rule complexity: stimulus-response mapping (low-level), flexible task updating (mid-level), and sustained cue-task associations (high-level). We found an interaction between levels of cognitive control and motivation in medial and lateral frontal subregions. Specifically, flexible updating (mid-level of control) showed the strongest beneficial effect of reward and only this level exhibited functional coupling between dopamine-rich midbrain regions and the lateral frontal cortex. These findings suggest that motivation differentially affects the levels of a control hierarchy, influencing recruitment of frontal cortical control regions depending on specific task demands

The Rostro-Caudal Axis of Frontal Cortex Is Sensitive to the Domain of Stimulus Information

Evidence suggests that lateral frontal cortex implements cognitive control processing along its rostro-caudal axis, yet other evidence supports a dorsal-ventral functional organization for processes engaged by different stimulus domains (e.g., spatial vs. nonspatial). This functional magnetic resonance imaging study investigated whether separable dorsolateral and ventrolateral rostro-caudal gradients exist in humans, while participants performed tasks requiring cognitive control at 3 levels of abstraction with language or spatial stimuli. Abstraction was manipulated by using 3 different task sets that varied in relational complexity. Relational complexity refers to the process of manipulating the relationship between task components (e.g., to associate a particular cue with a task) and drawing inferences about that relationship. Tasks using different stimulus domains engaged distinct posterior regions, but within the lateral frontal cortex, we found evidence for a single rostro-caudal gradient that was organized according to the level of abstraction and was independent of processing of the stimulus domain. However, a pattern of dorsal/ventral segregation of processing engaged by domain-specific information was evident in each separable frontal region only within the most rostral region recruited by task demands. These results suggest that increasingly abstract information is represented in the frontal cortex along distinct rostro-caudal gradients that also segregate along a dorsal-ventral axis dependent on task demands

An fMRI study of canonical and noncanonical word order

Abstract: Understanding a complex sentence requires the processing of information at different (e.g., phonological, semantic, and syntactic) levels, the intermediate storage of this information and the unification of this information to compute the meaning of the sentence information. The present investigation homed in on two aspects of sentence processing: working memory and reanalysis. Event-related functional MRI was used in 12 healthy native speakers of German, while they read sentences. Half of the sentences had unambiguous initial noun-phrases (masculine nominative, masculine accusative) and thus signaled subject-first (canonical) or object-first (noncanonical) sentences. Noncanonical unambiguous sentences were supposed to entail greater demand on working memory, because of their more complex syntactic structure. The other half of the sentences had case-ambiguous initial noun-phrases (feminine gender). Only the second unambiguous noun-phrase (eighth position in the sentences) revealed, whether a canonical or noncanonical word order was present. Based on previous data it was hypothesized that ambiguous noncanonical sentences required a recomputation of the sentence, as subjects would initially commit to a subject first reading. In the respective contrasts two main areas of brain activation were observed. Unambiguous noncanonical sentences elicited more activation in left inferior frontal cortex relative unambiguous canonical sentences. This was interpreted in conjunction with the greater demands on working memory in the former condition. For noncanonical ambiguous relative to canonical ambiguous sentences, an activation of the left supramarginal gyrus was revealed, which was interpreted as a reflection of the reanalysisrequirement