Rehabilitating Case of Tetralogy of Fallot Undergone Surgical Repair with Comprehensive Exercise Program: A Case Report

Tetralogy of Fallot (TOF) is one of the most common cyanotic congenital heart disorders (CHDs). The children with CHD lead relatively sedentary lifestyles, on account of the restriction imposed by treating doctors, parents, and society and by themselves due to fear. The disability related to CHD results in an additional adverse impact on quality of life and physical activity level due to deconditioning. The cardiovascular effects of deconditioning are a decrease in cardiac output, increase resting heart rate with activity, decreased blood pressure in upright positions (orthostatic hypotension), and decreased exercise capacity. These effects would be more pronounced and disabling in an already compromised heart. The operative procedure for the correction of TOF is not curative rather a palliative one. After the correction of the TOF defects, the patient has reduced activity level and exercise capacity. Cardiac rehabilitation including Interval and continuous exercise training modalities were proven to be safe and efficient in improving exercise capacity and functioning of the heart.

Dynamic Modeling and Control of a Simulated Carbon Capture Process for Sustainable Power-to-X

The goal of this study is to develop a dynamic model for a Carbon Capture (CC) process that can be integrated with a water electrolysis facility. The possibility of operating the post-combustion CC plant dynamically is investigated. The final model successfully tracks the parallel hydrogen production, providing the stoichiometric required CO2 stream for the subsequent methanol reactor. A dynamic model is used to configure controllers and to test the unit performance and stream conditions for various set points. Through the transient operation, the required feed gas is provided while optimizing the solvent and energy requirements. It is found that the slowest acting stage is the reboiler with a time constant of 3.8 h. Other process variables stabilize much quicker, requiring only a few minutes to reach steady-state conditions. The hydrogen-tracking scenario shows that the carbon capture plant can successfully operate under varying conditions with a maximum CO2 output increase of 7% of the minimum flowrate in the representative 24 h simulation time. The output CO2 stream is maintained at the desired >98% purity, 25 °C temperature, and 1.85 bar pressure, which allows to successfully perform hydrogen tracking operations.

Machine Learning as New Approach for Dogleg Severity Prediction

Conventionally offset well studies are performed by individuals where the results depend very much on visual perception, interpretation, and experience. In the specific cases for predicting the dogleg severity (DLS) output, the offset well study will take time proportionate to the volume of input, with the results being averaged out and contain high tolerances. In specific projects, these tolerances are larger than accepted, encouraging the service provider to utilize conservative solutions such as rotary steerable system (RSS) with high DLS capability in order to reduce the residual risks. These solutions can often be more costly in terms of maintenance and may add unnecessary tortuosity to the hole leading to issues during execution. This paper explores the concept of using machine learning (ML) to perform offset well study and defining key parameters affecting the DLS output. This concept consolidates the vast volumes of data that have been acquired while drilling and defines the relationship of each parameter to the final output of DLS. The first analysis reviewed five offset wells and found a multivariable correlation between applied drilling parameters to the DLS output. This correlation was then applied in 6 boreholes (3 multilateral wells), observing consistent DLS output increase by 50% using the same technology and optimal drilling parameters. The second analysis uses the same process to determine a planning DLS limit in a curve section over different formations. This paper demonstrates the potential of ML in offset well studies and beyond to predict behavior and define the relationship in a big data environment.

Innovation of Pump as Turbine According to Calculation Model for Francis Turbine Design

The effective utilization of micro hydropower sources is often realized through the use of pumps as turbines (PAT). The efficiency of PAT is about the same as that of the original pump. A further increase in efficiency and power output can be achieved by modifying the parts interacting with the flow, especially the impeller and the adjacent volute casing and draft tube. This paper presents a user-friendly calculation model of Francis turbine design and its application for PAT geometry modification. Two different modifications of a single-stage radial centrifugal pump were designed according to this model. The first modification (Turbine) consisted of a complete revision of the impeller geometry, volute casing and draft tube, which corresponded to a conventional Francis turbine. The second modification (Hybrid) was based on altered calculation model and consisted of a modification of only the impeller, which can be used in the original volute casing. Both modifications were tested on hydraulic test circuit at different heads. A comparison of the results of the Hybrid and the Turbine modification with the unmodified machine (Original) proved an increase in overall efficiency by 10%. Both modifications provided a higher flow rate and torque. This resulted in an overall power output increase—an increase of approximately 25% and 40% due to the Turbine and Hybrid modifications, respectively.

FINANCIAL INTEGRATION AND ENVIRONMENT IN AFRICA: THE ROLE OF OUTPUT GROWTH AND FOREIGN DIRECT INVESTMENT

As economies integrate financially and both investment and output increase, the environment may be affected depending on the nature of international financial resources attracted into the country. Hence, this study examines the effect of financial integration, output growth, and foreign direct investment (FDI) on the environment in selected African countries involving Nigeria, South Africa, Egypt, Algeria, and Angola between 1980 and 2017. The study uses carbon emissions and particulate emissions (PM) to proxy pollution and analyze the data through the fully modified ordinary least squares (FMOLS) technique. Empirical results show that financial integration worsens pollution in Egypt, Nigeria, Algeria, and in Africa; output growth deteriorates pollution in South Africa, Algeria, Angola, and in Africa; while FDI fuels environmental degradation in Egypt and South Africa. We recommend that African countries should strive to establish specific targets for lowering emissions even though the Kyoto Protocol did not set specific emissions reduction targets for them.

The features of classification in hydrocyclones in the course of titanium magnetite ore grinding

Research aim is to assess the use of hydrocyclones in the closed circuit of the second stage of grinding for the conditions of EVRAZ KGOK dressing mill. Methodology. Industrial tests were carried out under various solid phase capacities of two hydrocyclones GTs-710. Industrial testing results and their discussion. Increase in the content of solid and –71 µm class in the feed of the hydrocyclone results in discharge output increase. Decrease in the content of solid and increase in the content of –71 µm class result in the increased content of –71 µm class in the discharge. When increasing the content of solid in the feed of the hydrocyclone, the extraction of all size classes into the discharge of the hydrocyclone increases. At the same time the efficiency of classification by –71 µm class reduces. 84 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 1. 2021 ISSN 0536-1028 Iron content values in hydrocyclone discharge and sand. The classifying hydrocyclone partially separates by density resulting in different content values of iron in discharge and sand. Under pulp high density, the content of iron in the discharge is higher than that of iron in sand. Under low density of feed pulp, there is less iron in the discharge, compared to that in sand; that is due to small particles of titanium magnetite entering the sand. Summary. The indicators of separation by size in hydrocyclone are significantly affected by the content of solid and –71 µm class in the feed. The drawback of the hydrocyclone is partial separation by density (in iron) which results in overgrinding of titanium magnetite in the closed circuit of grinding and higher losses in subsequent procedures of wet magnetic separation. The technologies which make it possible to reduce overgrinding of titanium magnetite in the closed circuit of grinding are as follows: automatic control system for classification in the hydrocyclone, the use of hydraulic screens instead of hydrocyclones, and multi-stage dressing.

The Evolutionary Characteristics of Apple Production Layout in China from 1978 to 2016

ABSTRACT: Based on the apple acreage and output data of 23 provinces in China, the LMDI decomposition method and the barycenter analysis model were used to systematically analyze the spatiotemporal characteristics of apple production in China from 1978 to 2016. The results showed that the apple acreage and output continued to increase, and the apple production layout has moved to south-westward; Shaanxi, Shandong, Henan, Shanxi, Gansu, Hebei, Liaoning, and Xinjiang were the main contributors to the apple output increase in China; yield contributed more to apple output increase, the increase of yield was a significant contributing factor to the apple output growth in 17 provinces, whereas the expansion of apple acreage was a significant contributing factor in the other 6 provinces; the barycenter of apple acreage and output respectively moved to the southwest by 506.63 kilometers and 574.12 kilometers, and the barycenter of apple production gradually shifted to the Loess Plateau. To stabilize the effective supply of apple and maintain industrial security, the policymakers should attach importance to the fundamental role of technological progress in the development of the apple industry, and bring into play the technological progress, economic, social, and environmental effects of apple industry agglomeration by optimizing the apple production layout and strengthening policy guidance and regulatory measures.