Applied Mechanics and Materials Vols. 316-317

Abstract: A new type of activated carbon for flue gas desulfurization is obtained by carbonization of non-pitch based formed-coal and characterized by the BET method. The results indicate that the activated carbon with non-pitch binder has higher mechanical strength and sulfur absorptive capacity than the pitch-based activated carbon at adding the same quantity binder. When the addition of non-pitch binder reaches 15.0 wt. %, the activated carbon exhibits the optimum performance. The characterization result shows that the activated carbon with non-pitch binder presents a more developed micro-pore structure, more specific surface area and higher adsorption capacity.

Abstract: The Formation of Heterojunction Structure between Two Semiconductors Was Considered as an Effective Method to Enhance the Photocatalytic Activity. here, we Reported a Simple Method to Prepare SnS₂/SnO₂ Heterojunction Photocatalysts by Annealing SnS₂ in Air. the Structure, Morphology, Chemical Compositions and Optical Properties of the Obtained Materials Were Characterized by the X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Energy-dispersive X-ray Spectroscopy (EDX) and Ultraviolet-visible-near Infrared (UV-Vis-NIR) Absorption Spectra. the Photocatalytic Investigations Showed the Composites Have Higher Photocatalytic Activity than the Single-phase SnS₂. the SnS₂ Powder which Annealed at 400 °C for 60 Min Showed the Highest Photocatalytic Performance.

Abstract: Abstract. The present study concerns a development of cement-free concrete using finely grained ground granulated blast furnace slag (GGBS) rather than ordinary Portland cement (OPC) as a binder in concrete mix. The GGBS was very finely ground to the level of 10,000 cm2/g, prior to casting concrete, compared to OPC of which the Blaine value accounts for about 3,200 cm2/g. In concrete casting, the NaOH activator was added to mixing water to enhance the hydration rate for cement-free concrete. To ensure the compatibility of GGBS in concrete, a development of concrete strength, ionic penetrability and pore structure were examined. As a result, it was found that cement-free concrete using the GGBS has a higher concrete strength at all ages from 7 to 56 days. In turn, the ionic penetrability, in terms of chloride diffusivity, was slightly lower in cement-free concrete than OPC concrete, presumably due to the dense pore structure, which was confirmed by the mercury intrusion porosimetry. Simultaneously, the adiabatic temperature for cement-free concrete initially rose more rapidly, leading to an accelerated hydration process. This suggests that the cement-free concrete containing GGBS can be used for structural concrete structures, imposing an economical benefit and structural stability.

Abstract: A simulation model was developed for predicting the particle size evolution in hydrothermal synthesis of nanoparticles in supercritical water. Four elementary kinetic processes, including hydrothermal synthesis reaction, nucleation, growth, and aggregation, were involved based on the population balance equations (PBEs). The homogenous nucleation of metal oxide nanoparticles started at the operation time of 3.72μs. When the rate constant of hydrothermal synthesis reaction lnk increased from 2.8 to 6.16, the nucleation rate increased by three orders of magnitude (1021-1024particles/m3•s) and the nucleation period reduced from 0.2s to less than 0.02s. The APS decreased by approximately half when a ten-fold smaller growth rate constant was adopted in the range of 10-11-10-8.

Abstract: In this work, biodiesels, such as such as ethyl stearate, ethyl oleate, ethyl linoleate, ethyl ricinoleate, were adopted as lubricity additives for low-sulfur diesel fuel, at the concentration range of 0.1~2 wt%. Tribological evaluation obtained from the High-Frequency Reciprocating Rig (HFRR) showed that double bonds or hydroxyl introduced in the carbon chain of the esters could lead to a higher lubrication performance. The lubricity efficiency order was explained by the molecular dynamics (MD) simulations. The lubricity enhancing properties of the esters are mainly determined by the cohesive energy of adsorbed films formed on iron surface. The greater the cohesive energy, the more efficiently it is that the esters enhance the lubricity of low-sulfur diesel fuel.

Abstract: The research progress on settling characteristics of non-spherical particles is summarized. Three new filling coefficients in three directions of cuboid are defined. Combining with the existing parameters, a new mathematical model of drag coefficient CD is proposed that using six variables describes the shape information of arbitrary shape particles. This equation is derived and shows reasonable accuracy with the error being less than 1%.

Abstract: This paper analyzed the endothermic efficiency of the plate in line heating process combing with the need of researching on the recovery of waste heat in the gas flame process. Firstly the non-linear partial differential equations of three-dimensional transient temperature field were derived with the analysis of hexahedron in the plate. Then the temperature field of the plate was numerically simulated using gaussian heat source heat flux model with ANSYS software. Finally the heat absorption efficiency formula of the plate was derived based on the finite volume method. The endothermic efficiency model in this paper provides a basis for further analysis of the whereabouts of the heat released in line heating process in theory.

Abstract: Four varieties of winter wheat with different return green rates were used to analyze the plasma membrane stability and the factors that affect cold-area winter wheat during winter. The removal of reactive oxygen species, the degree of plasma membrane impairment, water content in the crowns, which contain the growing point, were studied during cold acclimation to the deep freezing period. The results show that electrical conductivity reflects the degree of plasma membrane damage under low temperatures was significantly correlated with the free water and the total water content. The MDA content, which reflects the degree of membrane peroxidation, was very significantly correlated with SOD, peroxidase, and ascorbic acid. During this period, the MDA stability, SOD, GSH, and total water and free water content may be used to identify the cold resistance of winter wheat varieties.

Abstract: Induces the operating principle of the induced radiation unit and studies the uniformity of indoor temperature distribution in the space and time, comfort and dewing condensation based on the PMV-PPD thermal comfort evaluation system. Through data collation and results analysis, obtains thermal comfort superiority and energy-saving potential of the reduced radiation air conditioning. The results show that the temperature distribution in the room stalled by the reduced radiation units is uniform, without sense of temperature difference and ventilation, providing an ultra-comfortable environment and that the indoor setting temperature can be up to 27°C on the premise of meeting comfort requirement. At the same time, air supply of low temperature can be achieved without condensation, reflecting the energy-saving potential of the system. These provide a reference for design of the induced radiation air conditioning system and further study.

Abstract: The water inrush from coal mine floor is a typical catastrophic process. A catastrophic theory is applied to water bursting in pit footwall for the first time. Through the research on lost stabilization of energy in the floor system of coal mine, a cusp catastrophic model applied to forecast water bursting from coal mine floor is put forward. The formulas of the critical stress, the strain and the released energy of the floor are developed when the floor system lost stabilization. So a new theory approach is offered for the forecast of water inrush from coal mine floor.