Applied Mechanics and Materials Vols. 687-691

Abstract: The test make steel cylinder concrete, PVC protection tube cylinder concrete , spray coatings Outside the cylinder concrete and no protective measures on ordinary cylinder concrete in three different strength grade:C25, C35 and C50 , putting in the freeze-thaw cycle in three kinds of environment of 5% sulfate solution, 5% sulfate + 3% chlorine salt solution and distilled water,Analysis of the Research of Ring pressure of the Pile foundation on the influence of the durability of concrete by measuring the concrete of Pile foundation corrosion mass loss before and after freezing and thawing.Experiments show that:the concrete with protective measures almost has no mass losses with the level of pile foundation concrete in the same corrosive environment,that, s to say ,the durability is good.While the unprotected concrete has mass losses after the freeze-thaw action hitches in three kinds of solution,And the largest mass loss is in the mixed solution,the durability is the worst.

Abstract: PbTiO₃ (PTO) films were successfully fabricated by sol-gel method. We studied the structure and the nanoscale polarization switching property using XRD and Piezoresponse Force Microscopy. The results reveal that the PTO films are single perovskite phase grain films with tetragonal structure, and are polycrystalline materials with no evidence of preferential orientation. The average grain size is about 150nm and a striped multi-domain structure is exhibited in individual grains. Under 15 kHz alternating current of PFM, a significant asymmetry of switching pattern was observed. We suggest that the cooperative action of the built-in electric field at the bottom interface and the PFM ac-voltage lead to the asymmetry switching.

Abstract: The microstructure design of acoustic cloaking is the key to realizing physical parameters required, and it is also closely correlated with realization of such projects as processing capability. The paper investigates the layered design of ring-shaped acoustic cloaking based on BM. According to the principle of transformation acoustics and the theory of PM cloaking, physical parameters of the acoustic cloaking are offered. Further, the relationship between the parameters of each layer of BM microstructure and the physical parameters of acoustic cloaking made of BM is determined. And the layered design of the acoustic cloaking are discussed. At last, the microstructure model of the acoustic cloaking is designed, and the ultra-precise micro-milling center is adopted for trial produce, to make a sample of the acoustic cloaking. The research results provide a kind of layered design method for ring-shaped acoustic cloaking, and indicat that the acoustic cloaking is realizable in engineering.

Abstract: In order to realize the online monitoring for iron grade of the magnetite during the dressing process, an iron grade fast measurement method based on electromagnetic induction is given, critical segment of the method is to make the iron grade information acquisition by adopting an iron ore core inductance sensor. Magnetic field analysis for iron ore core inductors of the sensor is explored in the paper. Taking a magnetite in certain regions of Liaoning as the test typical sample examples, physicochemical properties of its raw ore are analyzed, the iron ore samples are prepared and made, and the dressing process are completed. Ferromagnetics features of the magnetite samples above is analyzed, magnetic field distribution of the iron ore core inductor is analyzed, and analytic calculation formula of the magnetic fields is derived. Theory of solving the inductance of iron ore core inductor adopting finite element method of energy is discussed. Furthermore, total finite element design for the iron ore core inductor is made; distribution of electromagnetic field is analyzed. Influence regulations of self-inductance coefficients of the inductor are obtained, thus, the optimal combination of structural parameters of the inductor are designed. There is important practical significance to realize the iron grade testing automation for magnetite and other iron ores of the thesis research above.

Abstract: Poly (methyl methacrylate) (PMMA) is known as one of the common transparent polymer materials. In this work, pure poly (methyl methacrylate), methyl methacrylate-acrylonitrile copolymer, methyl methacrylate-styrene copolymer was synthesized by bulk polymerization based on the mechanism of free radical polymerization to observe the polarity change of the PMMA after introducing styrene and acrylonitrile monomers. Meanwhile the glass transition temperature, hardness, contact angle and color distribution of the copolymer were measured through polymer temperature deformation analysis experiment, hardness and contact angle measuring instrument.

Abstract: The mechanical properties of concrete under cryogenic temperature (-165°C) are affected by the temperature field inside the concrete. This paper presents assumptions by adjusting the formulas of thermal conductivity (λ) and specific heat capacity (C), respectively under low temperature. Through ABAQUS, we simulate the temperature downward-upward processes and compare them with the test results. Finally, the research gets more reasonable formulas of λ and C, respectively under cryogenic temperature.

Abstract: We adopted a new extraction method - Accelerated Solvent Extractor (ASE)[1] to extract the liposoluble constituents of Panax quinquefolius and Panax ginseng. GC-MS was used to analyze extract constituents with liposoluble, and which main peaks were identified. It was the fingerprints of liposoluble constituents of Panax quinquefolius and Panax ginseng [2]. This method was able to expose liposoluble constituents with a full range offering a new method for identification and controlling quality of Panax quinquefolius and Panax ginseng.

Abstract: A biological florescent probe Tb³⁺-doped hydroxyapatite (HA) nanoparticles was synthesized by hydrothermal method. During this process, L-lysine was added as a template, and different amount of Tb³⁺ was added to investigate the influence on the florescent property. The products were characterized by using XRD, TEM and PL. Results showed that with Tb³⁺ adding, the size and crystallinity of nanoparticles were changed, while their maximum emission intensity was at 544 nm and the best content of Tb³⁺ was 2 mol%.

Abstract: In the agency theory of internal capital market, the compensation incentive of Headquarters is discussed as a key factor to the efficiency of internal capital market, using KKT. Assumed that equity incentive and investment incentive are Headquarters’ compensation body, investments in divisions are decided by the comparison between equity incentive and investment incentive, the comparison results in internal capital market “Socialism”. Furthermore, for the maximum of equity incentive and investment incentive, Headquarters prefers to overinvestment in divisions.

Abstract: With economic development and improvement of living standards, people are increasingly demanding high-quality building products. However, due to the drawbacks of traditional quality management methods, it leads to a lot of problems in construction quality management, which affect the quality of the construction project, and even pose a threat to people's lives and property. Construction project quality evaluation system from lean construction perspective in this paper can effectively improve the current situation.