Continuous physical activity recognition for intelligent labour monitoring

Multimedia Tools and Applications - The paper addresses the problem of human activity recognition based on the data from wearable sensors. Human activity recognition depends on a wide context of...     

Uniform honing of long parts

Russian Engineering Research -     

Analysis of the Processes Involved in Refining Steel at the Tagmet Combine to Remove Corrosion-Active Nonmetallic Inclusions

The processes involved in refining steel at the Tagmet combine to remove corrosion-active nonmetallic inclusions (CANI) were analyzed using the program GIBBS®. The analysis was performed with the assumption that CANI are a special case of the oxide and sulfide inclusions normally seen in steels. Thus, it was proposed that the total number of all endogenic primary inclusions be reduced to a minimum and that their composition be optimized (that the inclusions be converted to the liquid state) in order to remove them from steel. It was shown that from 6 to 20% of all primary inclusions in steel are CANI, the exact percentage depending on the amount of alumo-calcium used in the treatment of the steel. It was also noted that the secondary oxidation of steel increases its volume content of primary inclusions by an order of magnitude. It was determined that the infiltration of oxygen into the treatment unit even at a rate of 0.3 kg/ton makes it impossible to obtain liquid primary inclusions. Modeling of the deoxidation of steel on a ladle-furnace unit at Tagmet made it possible to determine the optimum range of alumo-calcium consumption: 0.7–1 kg/ton (depending on the consumption of aluminum wire rod used for preliminary deoxidation). The formation of liquid primary inclusions — which includes CANI — is minimal in this case.     

Temperature dependence of metal desulfuration in steelmaking units

It is theoretically and experimentally shown that with the temperature increase the degree of metal desulfuration by a slag increases for unkilled iron-carbon alloys and decreases for killed steel.     

Tensile and compressive stress in the metal around a corrosive nonmetallic inclusion,in the presence of an aqueous medium

The formation of a region where corrosive inclusions interact with metal in an aqueous medium is investigated. The inclusion expands as a result of hydration, and corresponding tensile and compressive zones are formed. On the basis of the results, the mechanical-stress distribution around hydrating inclusions is simulated.     

Selecting an optimal model for forecasting the volumes of railway goods transportation

Consideration was given to selection of an optimal model of short-term forecasting of the volumes of railway transport from the historical and exogenous time series. The historical data carry information about the transportation volumes of various goods between pairs of stations. It was assumed that the result of selecting an optimal model depends on the level of aggregation in the types of goods, departure and destination points, and time. Considered were the models of vector autoregression, integrated model of the autoregressive moving average, and a nonparametric model of histogram forecasting. Criteria for comparison of the forecasts on the basis of distances between the errors of model forecasts were proposed. They are used to analyze the models with the aim of determining the admissible requests for forecast, the actual forecast depth included.