Advanced Materials Research Vols. 282-283

Abstract: This paper simulated mining face advancing with discrete element software UDEC to study the mining overburden strata movement and mine pressure behavior, so as to determine reasonable supporting method. According to the simulation test data, this paper also determines the range of compaction region, support active region, pressure increase region and stable pressure region, so as to prove the reasonability of the hydraulic support type, and proposes the method of support type choice by simulation techniques. Ground pressure behavior is an inevitable phenomenon during the mining process^[1-3]. It is necessary to take the appropriate supporting measures to support the surrounding rock, lest endanger the safety of personnel and engineer equipments in underground workface. More laboratory studies^[4][5] and scene investigation are in the existing studies, so there is a good understanding of ground pressure behavior. The numerical simulation can be made in advance when geological conditions can be determined. It can provide corresponding suggestions for the project according to ground pressure appearing regularity founded by simulation. This paper studys the overburden strata movement and ground pressure behavior, and determines reasonable support type by simulation optimization with discrete element software^[6] UDEC. And by comparing with the work field, we found evidences that the simulation optimization is feasible. with work field.

Abstract: 1D chain Ca(II) coordination polymer was synthesized and characterized by elemental analysis, molar conductance, IR and single-crystal X-ray diffraction, The results of crystal structure show that each Ca(II) ion forms eight-coordinated and the complex formed one dimensional chain structure by the oxygen atoms of carboxylate and water bridged. The antibacterial activity of the Ca(II) coordination polymer and the ligand were tested, the results show that the complex show considerable antibacterial activity against escherichia coli, bacillus subtilis and staphylococcus white.

Abstract: In order to synthesize a new catalysis material, the title complex, [Zn(2,2’-bipyridine)(H₂O)₂(SO₄)]_n, was prepared and determined by X-ray diffraction. The results shows that the compound was crystallized in the monoclinic system, space group C2/c, with a = 15.4304(14) Å, b = 12.7150(11) Å, c = 6.7068(5) Å, β = 102.103(10)º, V = 1286.61(19) ų, Z = 4. The geometry of Zn(II) is a distorted cis-ZnN₂O₄ octahedron. In the structure of the title complex, a one-dimensional chain structure is formed by hydrogen-bond.

Abstract: Large screen display system has good prospects for the formation of gaps that have been published. The introduction of this thesis programming before large-screen display system on the current development of software technology involved in a more comprehensive overview and discussion. In introducing the structure of the remote large screen systems design and related implementation techniques, the article discusses the big screen remote system software development, and details of video programming. Due to time and capacity constraints, only the planning and design to complete a thesis as part of the program inside the actual function, but also be further improved.

Abstract: A novel Ca(II) complex material was prepared by reaction of O-nitrobenzaldehyde- 3-amino-benzenesulfonic acid with Ca(ClO₄)₂, and characterized by X-ray single crystal diffraction method. The analytical results shows that the Ca(II) complex was crystallized in the monoclinic system, space group P2(1)/c, with a = 17.515(10) Å, b = 7.019(4) Å, c = 13.853(8) Å, β = 104.855(10) º, V = 1646.3(17) ų, Z = 2. The geometry of Ca(II) is a slightly distorted dodecahedrall geometry. In the crystal packing, the complex molecules form layered structure by the π-π packing interaction, and the molecules form a one-dimensional chain structure by hydrogen bonds.

Abstract: The energe storage system with combination of large-scale grid-connected wind farms will be the developing trend of renewable energy in future. The flow battery has becoming the most potential advanced chemical energy storage technology among the storage method. This paper is mainly introducing about the work principle, characteristics and structure of the VRB system. Futhermore, the control mechanism of the power quality and stability used in wind farm connected to power grid by battery energy storage is illustrated in the end of paper.

Abstract: A novel chiral poly(amide imide) containing L-alanine was synthesized by direct polycondensation reaction of newly synthesized N,N’-(4,4’-diphthaloyl)-bis-L-alanine diacid with 4,4’-diaminodiphenyl ether in a medium consisting of N-methyl-2-pyrrolidone (NMP), triphenylphosphite (TPP), calcium chloride (CaCl₂), and pyridine. The new chiral diimide-diacid monomer was synthesized by direct reaction of 3,3’-4,4’-Biphenyl tetracarboxylic acid dianhydride with L-alanine in acetic acid under refluxing conditions. The resulting compounds were obtained in quantitative yields and high purity. The synthetic diacid monomer was characterized by elemental analysis, ¹H-NMR spectroscopy, FT-IR techniques and specific rotation, the obtained polymer was characterized by FTIR techniques, specific rotation and solubility testing.

Abstract: With the thin-wall dynamic analytical model of aqueduct for fluid-structure coupling, the seismic reliability of aqueduct is studied. In this model the influence of the bend-torsion coupling, water-structure coupling and nonlinear rubber bearing isolation are all taken into consideration. Based on the type of site soil, the artificial seismic waves are created. In accordance with the maximum entropy principle and the measured data of structural internal force under earthquake, the reliability distribution function and the aqueduct reliability are calculated.

Abstract: Application technology of thin asphalt concrete overlay on old pavement is an important measure to keep pavement structural bearing capacity and its service performance.This paper is mainly focus on the characteristics application technology of thin asphalt concrete overlay on old pavement and the flaws of existing studies, discusses the concept of thin asphalt concrete overlay, introduces the design principle and applicable condition of thin asphalt concrete overlay, and researches the structure and thickness design of thin asphalt concrete overlay.This paper also summarizes the design method and construction technique for thin asphalt concrete overlay on old pavement.The results can provide a basis for construction and rational design of thin asphalt concrete overlay on old pavement.

Abstract: For investigating the reaction behavior of phosphorus in CaO–SiO₂–FeO_x low basicity slag, the CaO–SiO₂–FeO_x slag containing various amount of CaO particles was heated at 1623K and 1673K, respectively for 10 to 600s, and the products formed at the interface of the CaO particles and molten slag were observed by scanning electron microscopy (SEM) with energy dispersive X-ray (EDX). The research results showed that the solid solution containing P₂O₅ increased with the increasing of the heating temperature, and the formation of condensed phase was promoted by increasing the holding time and the CaO solid proportion.