Advanced Materials Research Vols. 1079-1080

Abstract: The results of synthesis and researches of hybrid gumic-magnetic composites are presented in the article. The possibility of regulation of quantitative speciation of composites (containing of Fe) is established at the variation of proportions Fe (II), Fe (III)/HA and the way of reagents injection in a reaction mixture. The possibility of designing of sorbents on the basis of humic acids and chemically connected particles of iron oxides as magnetic-active components for fixation and extraction of heavy metals ions and radionuclides from natural objects by means of magnetic separation is shown. The adsorption degree stands at 95% in an optimal mode.

Abstract: In this paper, we adopt boththe Lennard-Jones potential and the mean field theory to determine themolecular interactions between carbon dioxide and the double layered graphenes.In addition, we employ a modified van der Waals equation which takes into accountthe multi-scale effect in the absorption regime todeduce the gravimetric uptakeof carbon dioxide between graphene sheets. We show that the full absorptionoccurs at rather low external pressure at low temperatures while this happensat roughly 0.2bar at room temperature. The current methodology has the merit ofrapid computational times and producing deductive results in comparison to theusual MD simulations.For graphene sheets of a separation of 10 Å, the maximumgravimetric uptake could reach 13.3 wt.%.

Abstract: The combustion reaction mechanism of methane plays an important role on combustion, environmental protection and propulsion areas. Numerical investigations on the characteristics of Methane-Air premixed flame were conducted in this paper. Results indicate that: intermediate products such as HCO, CO increase first and then decrease; CO distributes behind HCO and is converted from HCO; The distribution of OH radicals is one dimensional, and there are two high concentration regions, only the region at the exit of the premixed gas corresponds to the flame front; final products such as CO₂ and H₂O exist at the whole reaction area.

Abstract: The results of studies on the development of a new process of thermal cracking of tar oil as a slurry with crushed oil shale to obtain components of motor fuels. The results suggest doubtless advantages of the process before the industrial of thermo cracking, since the single-stage processing of raw materials in relatively in the mild conditions (5 MPa, 425 °C, volumetric feed rate 1.0 h^-1) is achieved deep destruction of tar oil (the yield petrol fraction with a bp amounts to up to 180 °C – ~12 mass % of middle distillates with a bp 180-360 °C – 43-44 mass %, of raw material for catalytic cracking of a bp 360-520 °C – ~15-16 %, based on the initial tar oil). Formed like coke products and raw materials contained in V and Ni is postponed on the mineral part of slate and removed from the reaction zone with the liquid products of the process.

Abstract: The composition and structure of the microspheric aluminosilicates of Combined Heating and Power Plants (CHРP) ashes is studied with the help of modern physical-chemical methods (XRD, scanning electron microscopy, BET, elemental and chemical analysis). The activity of microsphere-based catalysts for the reaction of Na₂SO₃ oxidation by oxygen is also studied by kinetic and potentiometric methods. By means of EPR and Möessbauer spectroscopy it is concluded that iron ions into the composition of cenospheres exist in two states – Fe³⁺ and Fe²⁺, thus, the iron (III) is in the form of solitary ions in an aluminosilicate matrix in the range of the iron content 3-4 mass %.

Abstract: Inconsideration of the application defects of organic viscosity-reducing warm mixasphalt (represented by Sasobit), such as poor adhesion with aggregate,inadequate of low-temperature deformation, four methods for Sasobit modificationwere proposed and they were blending with polymer, grafting, hydroisomerizationand adjusting molecular weightdistribution width,then the feasibility of each method was analyzed. Moreover, given that performance evaluation of warm mix asphaltmixture still referenced for that of hot mix asphalt mixture, adhesion (water stability) evaluation method based on surface free energy and low temperature performanceevaluation method based on glass transition temperature were put forward to optimize the performance evaluation system of warm mix asphaltmixture.

Abstract: In order to calculate the shallow foundation for moreappropriate, the paperbuildinga simplemodel in line with the actual situation of reinforced shallow foundation andcalculates, thereby improves the existing analysis method. By analyzing themodel of shallow foundation reinforced by supplementary pile, the paper getsthe method for the new model, and combined with the specificexample. Then we compare theresult between the simple model calculation and theanalysis of finite element software Midas/GTS. The analysis of specific exampleshows that, the calculation results of this new simple model and finite elementsoftware are in substantial agreement, and satisfied the safety requirement,and achieves the ideal target.It has a certain practical and reference value,because itcan be quickly and conveniently to calculate the bridge shallow foundation.

Abstract: The dynamic characteristics and the control performances of Mega-Sub Controlled Structure Systems (MSCSS) is investigated in the paper. The control parameters of the structure system, such as the stiffness ratio (RD); the mass ratio of the mega-structure and sub-structure (RM) are studied and their optimal values are obtained in order to achieve better control performances when it is subjected to strong earthquake excitations. Then, trough the nonlinear elasto-plastic analysis, the effectiveness and the feasibility of the proposed MSCSS is demonstrated in reducing the displacement and acceleration responses. The study illustrates that the MSCSS presents good seismic resistance performance, which imply that structural section can be remarkably reduce and achieve to good economic characteristics.

Abstract: First, a fire test on concrete beams was carried out. Then after the static test of simply supported beam, the phenomena of simply supported beamsbefore and after fire were compared in order to determine the damage degree ofmechanical property. Finally, the width reduction method was proposed tocalculate the stiffness of beam after fire. And the formula applied toengineering practice was also deduced. The comparison of calculation resultsand experimental results was in a good agreement.

Abstract: This paper introduces Hebei Building science research and Development Centerenergy-saving design of passive public buildings by the simulation of soft Fluent, analysising the effect of thermal environment inatrium using fan coil and geothermal, geting the conclusion that the geothermal coil is moreefficient than fan coil, Providing a new idea for the passive public building energyefficiency design.