Advanced Materials Research Vol. 1096

Abstract: The paper introduces the application of new medical materials of PGLA and its advantages in different fields of acupoint catgut embedding therapy in clinical, pointed out that with the development of biological materials and minimally invasive medicine, the usage of PGLA in clinical popularity rate will more and more high.

Abstract: The possible geometrical and electronic structures of C₂₀ dimer are optimized by using the density functional theory at B3LYP/LANL2DZ level, stable structure of C₂₀ dimer are obtained. The stability of the ground state structure have been studied. The results showed that: there was a slight expansion in carbon cage of C20 dimer ; its chemical stability and thermal stability have been improved.

Abstract: A novel model for larch bark pyrolysis was established by combine dimensions, shapes, boundary conditions, pyrolysis gas diffusion, particle size and reaction heat expression. It overcomes the shortages of early models which are short of expression of the reaction heat and application conditions. By introducing the kinetic equations and shape factor, the model was simulated by commercial software. The simulation results indicated that the pyrolysis time of particles is increasing by particle size, the best size for larch pyrolysis is 0.8 mm under 775K.

Abstract: The polyethersulfone(PES) and sulfonated polyethersulfone(SPES) microspheres which all wraps titanium dioxide could be prepared by solvent evaporation method of double emulsion systems(W1/O/W2) or coagulation bath method. The results on the adsorption performance of methylene blue(MB) by PES and SPES microspheres wrapping titanium dioxide, SPES microspheres excluding titanium dioxide and the comparison of the isothermal and dynamic adsorption of SPES showed that, the adsorption performance of MB by SPES wrapping titanium dioxide is better than PES wrapping titanium dioxide, and the SPES excluding titanium dioxide is better than which wraps titanium dioxide.

Abstract: Errors was generate when use integral methods to calculate pyrolysis kinetic. It was analyzed by considered the effects of methods and reaction orders. A α-T curve was established for the error discussion depending on basic kenotic theory. For analysis methods, both single curve and multiple curve methods can obtain reliable activation energy values (≤3%), but the error of frequency factor was significant (up to 40%). Frequency factor is sensitive to intercept changing and is also to reaction order. Magnitude error could show if reaction order deviates to true value.

Abstract: The bulk samples with the composition Bi_1.8Pb_0.4Sr_1.9Ca_2.1Cu_3.5O_y + x wt% MgO + (5-x) wt% Ag₂O (x = 0, 1, 2, 3, 4 and 5) were prepared by sintering at 840°C for 240 h after partial­melting at 870°C for 1 h. The sample with individual Ag₂O addition shows the lowest melting temperature and the lowest proportion of the Bi-2223 phase, whereas the sample with individual MgO addition shows the highest melting temperature. The highest proportion of the Bi-2223 phase appears in the sample with 1wt% MgO and 4 wt%Ag₂O mix-additions. With increasing MgO content, the width of hysteresis loop ΔM of the bulk samples at 77 K increases (0≦x≦2), and then decreases (2≦x≦5). The largest ΔM appears in the sample with 2 wt% MgO and 3 wt% Ag₂O mix-additions.

Abstract: In this paper, the calculation software HSC indium mine under vacuum carbothermal reduction reaction during the Gibbs free energy. The result show that when the pressure of 10-100Pa and temperature is 380-449K, In₂O₃ and C reaction to reaction thermodynamic conditions under pressure from the same system, material In₂O₃: C mole ratio is 1:3, needed to generate elemental In reaction temperature is the lowest. In₂O₃ generated In₂O thermal decomposition, with the loss of the system pressure, the initial reaction temperature from 1247K to 10Pa for 423K; Intermediate In2O pyrolysis generating elemental In, when the system pressure drop to 10 Pa, starting temperature dropped to 781K; InO reaction with products CO, as the system pressure is reduced, the gibbs free energy increase, therefore, step-down to InO reaction with CO. This study to provide experimental evidence for preparation of indium by carbothermic reaction of indium ore in vacuum. Keywords: Indium ore;Carbon thermal reduction;Vacuum; Thermodynamics;Introduction

Abstract: The long persistent phosphor SrS: Eu²⁺, Dy³⁺ was prepared by hydrothermal method. The crystalline structure was characterized by using X-ray diffraction (XRD). The experimental excitation spectrum was carried out with Flurolog-3 fluorescent spectrometer. The results show that there are seven sharp sub-peaks on the wide band spectrum. This paper focuses on the origin of the seven peaks. Rhodamine B standard solution was used to confirmed that these peaks correspond to the light source (Xe lamp) emission in Flurolog-3 fluorescent spectrometer. The excitation spectrum of Eu²⁺ in SrS: Eu²⁺, Dy³⁺ was corrected with Rhodamine B. It was found that the corrected spectrum was quite different from the experimental spectrum.

Abstract: Thermal simulation compression tests were performed on semi-solid billet in order to observe and investigate the behavior of 6061 aluminum alloys while varying the processing parameters such as apparent viscosity, the shear rate and the temperature. Specimens of 6061 aluminum alloys were characterized with their semi-solid behavior during partial melting and holding in the semi-solid state. Furthermore, the constitutive equation of semi-solid 6061 aluminum alloys was investigated. Moreover, the tests allow the apparent viscosity and shear rate of the alloys to be determined as a function of the solid volume fraction and strain rate together with the geometry behavior of the specimen. Utilizing these parameters, semi-solid die casting process of 6061 aluminum alloys could be simulated by the change of the solid volume fractions.

Abstract: The paper carried out a research on the dark fiber shape and genetic mechanism of the acidic fiber imaging bundle. The Dirac delta function is firstly used to analyze the probability distribution variety of the dark silk. The experimental results for the detection of the scanning electron microscope (SEM) and resolution show that the genetic ratio of the dark fiber is proportionate to length of the bundle and inversely proportional to the monofilament diameter. However, the monofilament diameter should be decreased to increase the resolution. The technique and the structure should be improved to meet the requirements of both high resolution and low dark silk rate. Therefore, solutions and effective measurements for reducing even if avoiding the dark silk are proposed in the paper. The research will guide the preparation and application of the high-resolution fiber imaging bundle.