Advanced Materials Research Vols. 476-478

Abstract: Supramolecular complex，Zinc-tetraphenylporphyrin, 4,4’-azopyridine, Luminescence. Abstract. A new supramolecular complex(C₄₄H₂₈N₄Zn)₂•(C₁₀H₈N₄)•(C₇H₈)(1) has been prepared by Zinc-tetraphenylporphyrin(ZnTPP) coordinated with 4,4’-azopyridine, which has been characterized by X-ray single-crystal diffraction.The electronic absorption spectra and fluorescence spectra reveal that the complex displays strong blue light and fluorescence, which is a good optical material.

Abstract: A full color 2.2″ passive matrix organic light-emitting diodes (OLEDs) with 128 (RGB) * 160 pixels was developed. The display features that driving circuit can transform 18 bits gray-scale data from a PC to the OLED panel via a DVI channel. The size of the pixel was 240μm240μm, while that of mono sub-pixel is 190μm45μm. The lifetime of panel was estimated over 5000h because of the use of dual-scan driving technology, and the power consumption of the display was 300mw about when the average luminance of panel reach 40cd/m2.

Abstract: Ni-doped mesoporous indium oxide has been successfully obtained by a simple and effected in-situ nanocasting method. The results characterized indicated that powders had a good crystalline structure, and the synthesis was successfully controlled in nanoscale (meso-structure). The gas sensor based on Ni-doped mesoporous In2O₃ exhibit good trimethylamine (TMA) sensing properties, and a possible mechanism was a_{Subscript text}lso provided.

Abstract: The uniaxial and multiaxial non-proportional cyclic experiments of 16Mn steel under strain-control were carried out using MTS809 machine and Teststar control system. Cyclic softening was observed for 16Mn steel under strain-control cyclic loading. The restraining effects of mean strain, strain amplitude, non-proportional loading path and their histories to subsequent cyclic softening were revealed, and some useful conclusions for establishing constitutive model of non-proportional cyclic were obtained

Abstract: A computational model which is based on the classical homogenous nucleation theory was developed to analyse the alumina inclusion-nucleation process in molten steel in this paper. The idea, 'pseudomolecules', proposed by Lifeng Zhang[1,2], was cited as the basic unit of the physical process of nucleation. However, the nucleation stage was evolved to be controlled by the diffusion of pseudomolecules groups than single pseudomolecule, which is much closer to the actual situation. The differential equations of different pseudomolecules size distribution were given and calculated by computer programs using Runge-Kutta method. Some key parameters, such as supersaturation, nucleation rate, and inclusion population were calculated and compared with some others' conclusion.

Abstract: The processing method for introducing an ultrasonic wave probe directly inserted into the molten steel was used. Effect of ultrasonic and argon-blowing on the nitrogen content in low carbon steel was carried out. The results showed that with the ultrasonic treatment separately, the nitrogen content in the molten steel reduced, but the removal rate was relatively lower with about 3.13~9.04 %. Using the argon-blowing agitation separately, the removal rate of nitrogen in the steel was relatively higher with about 6.89~32.68 %. With the increase of argon flow rate and prolong of the treatment time, the removal rate of nitrogen in the molten steel trended to increase at first, and then reduce.

Abstract: Al₂O₃ reinforced iron based composite were prepared via in-situ synthesis with aluminum nitrate, citric acid and iron powder as raw materials, a little C and Mo as additive. The influences of the contents of Al₂O₃, C and Mo on the microstructure and micro-hardness of the Fe based composites were characterized by XRD, SEM, TEM and micro-hardness tester. The results showed that the Fe-based composite materials with high bonding strength between matrix and Al₂O₃ can be prepared by in situ synthesis method. The best ratio of the nine Al2O3 particles reinforced Fe-based composite materials in three groups is 3vol. % C, 5vol. % or 7vol. % Al₂O₃, sintering temperature is 1300°C and quenching temperature is 900°C. The microstructure of the matrix without C addition is ferrite before and after quenching; the microstructure of the matrix with C addition is pearlite before quenching, and the microstructure become to martensite after quenching, the α-Al2O3 and FeC₃ are reinforced phases. The microstructure of the matrix with Mo addition is ferrite and FeAl₂O₄ before and after quenching.

Abstract: An approach of point clouds based dynamical representation for Heterogeneous Objects (HEO) is proposed to describe the HEO, in which materials distribution is uniformed or irregular. Mesh refined STL model and micro-tetrahedral cell are employed to rebuild HEO geometry. Meanwhile, distribution property, volume fraction and distribution vector are used to represent material features of HEO nodes within each material layer. Therefore, after implementing the above interrogation process layer by layer, HEO geometry and material composition representation can be defined. The approach is effective and practicable through some numerical examples demonstrated based on developed HEO fabrication system.

Abstract: The whole rock fully-mechanized excavation with big cross section, high rock hardness and strong cutting intensity of fully-mechanized coal winning machine has a higher dust concentration than coal roadway excavation, so ventilation dust removal technology is in need in whole rock face. Based on the dust migration and distribution numerical simulation in whole rock tunnel excavation, optimization design of long pressing and short pumping hybrid ventilation and dust removal system were carried out. Eventually, the comprehensive dust prevention measures with air curtain closing dust source, dust electromotor exhausting dust and retaining curtain capturing dust were realized in this paper, which achieved a good removal efficiency of dust.

Abstract: Pulse width modulation (PWM) is often one of the important power regulation method of ultrasonic power supply. The traditional PWM control circuit has the shortcomings of complex design structure, slow dynamic response and low reliability. An advanced PWM technique for choppers of ultrasonic power supply based on FPGA is proposed. Through open-loop operation, it regulates the output pulse width of ultrasonic power supply dynamically. The simulation result shows that the PWM control circuit based on FPGA can realize to adjust the width of PWM signal and power regulation conveniently.