Tribological properties of nanolamellar tungsten disulfide doped with zinc oxide nanoparticles were studied. Nanolamellar tungsten disulfide and ZnO nanoparticles produced by electrospark erosion of metal granules in an H2O2 solution were analyzed using the XRD, SEM and TEM techniques. According to the tribological measurements, ZnO nanoparticles did not significantly change the friction coefficient of nanolamellar WS2 at 25 °C in air, whereas they positively impact on wear resistance of nanolamellar WS2 at 400 °C.
Tribological behavior of Cu–MoS2 and Ag–MoS2 nanocomposite lubricant was studied. Cu nanoparticles produced by electrical explosion of copper wires and Ag nanoparticles prepared by electrospark erosion were employed as metal cladding modifiers of MoS2 nanolamellar particles. The tribological tests showed Cu–MoS2 and Ag–MoS2 nanocomposite lubricants changed the friction coefficient of the initial grease and essentially improved its wear resistance.
This work is aimed at analyzing demand dynamics for hydrocarbon fuels from March 2020 and developing a forecast model for the near future. Based on the method of artificial neural network with feedforward and backpropagation learning, a model is proposed for forecasting oil demand and passenger mobility during a pandemic for the United States, Russia, and India. The results of the calculations showed that road and air transport dynamics strongly depend on the application of measures to limit and ban and the level of COVID‐19 incidence in a country. The proposed method can be used to make forecasts during pandemics and unforeseen situations to regulate the price policy for hydrocarbon fuels and the safety of passenger traffic in the future.
The article refers to studies related to the purification of biogas. Biogas is obtained by fermenting of native manure. Biogas is obtained as a result of fermentation of native manure with subsequent purification from unwanted impurities. After purification, the content of methane in biofuel rises, therefore the quality of alternative fuel improves. The results of studies on the use of natural zeolites of the Khonguruu deposit in the Suntarskyulus of the Republic of Sakha (Yakutia) as a filter material are presented. The device of the filter for biogas is described.The materials for planning a multifactorial experiment are briefly presented. The most significant factors of the biogas purification process have been specified: size of fractions, zeolite mass, ratio of the height of bulk material to the diameter of the filter. It is shown that the maximum efficiency of biogas purification was obtained with the ratio of the height and diameter of the filter H/d = 3.0: 4.2. The optimal average weighted diameter of the granules of the bulk filter material (zeolite) is 0.004 m. The optimum mass of the filter material is 0.75-0.8 kg. At the filter outlet, biogas with 93.3%of methane content wasobtained.
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