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A career as an operating and stationary engineer
\"We may not always notice them, but operating and stationary engineers help keep the world running smoothly. This practical resource explains the importance of operating and stationary engineers and provides descriptions for several jobs within each field, including surveyor, heavy equipment operator, boiler operator, HVACR engineer, and building manager. Readers will learn the educational requirements and job training that are necessary to obtain these jobs, as well as steps they can take right now to get them on the right path. Job outlook and information about trade unions and other resources are also provided.\"--Provided by publisher.
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Study on the Strength and Microstructure of Coal Gangue Concrete Using Sulfurized COsub.2 Composite Gas and Steam Carbon Fixation
Addressing the complex physicochemical properties of coal gangue from typical mining areas in Inner Mongolia, this study focuses on this area’s abundant reserves coupled with the low utilization rate and significant strength variability of ecological slope protection materials. Notably, research on the alkalization–carbonization of coal gangue remains scarce. To bridge this gap, we propose a method leveraging the moisture migration behavior of coal gangue porous media. By utilizing continuous displacement high-temperature steam carbon sequestration enhancement technology, internal moisture is gradually and precisely controlled to induce the formation of high-temperature carbonic acid gas. This process facilitates internal carbon sequestration and effectively locks in the sequestration effect. This approach enables effective loading of sulfurized CO[sub.2] composite gases in a reversible manner, achieving passive carbon sequestration driven by moisture migration. Consequently, it enhances the negative carbon content within the aggregates while bolstering their mechanical properties. After alkalization pretreatment with various concentrations and three hours of carbon sequestration, the microhardness of the aggregate surface and transition zone were observed to have increased by 24.3% and 36.4%, respectively. Additionally, the compressive and splitting tensile strengths of coal gangue concrete rose by 4.8 MPa and 0.4 MPa, respectively, while porosity decreased by up to 3.6%, and the proportion of harmful pores dropped from 11.22% to 6.54%. A strong correlation between the proportion of harmless/low-harm pores and strength development was observed. Overall, the high-temperature carbonic acid steam displacement method with sulfurized CO[sub.2] composite gases effectively improves the physicochemical properties of coal gangue aggregates and enhances surface activity and hydration in the interface transition zone, meeting the engineering standards for in situ ecological remediation in Inner Mongolia’s mining areas.
Journal Article
