Applied Mechanics and Materials Vols. 80-81

Abstract: Metal ceramic composite are adding ceramic particle powder to metal, also called powder dispersion reinforced materials, Its unique properties with extensive use value. But how to produce the metal ceramic composite is the main diffculty of the technology. In the last the method of the mixing are mechanical mixing method ,electromagnetic stirring and so on .The shortcomings of mechanical mixing method is clunky, difficult operation and low efficiency. The problem of the electromagnetic stirring method is its large equipment investment and its complex device. The paper researched a new device to produced metal ceramic composite in the semisolid process which advangtage is self-quantitative ,uniform mixing,save energy and environmental protection.This device was designed in sample full consideration of the mixing process may. As much as possible to avoid cracks. As to the sealed containers to consider the nitrogen let liquid to prevent oxidation and reduce the impurity intervention; Another auxiliary handle design also to make the experiment more convenient and accurate Indeed, etc. These advantages are the practicability for device, and provide a guarantee for the production metal ceramic composite.

Abstract: Material characteristics of Zinc Oxide doped Al are investigated for microharvester. The microharvester include two parts, the first part is zigzag structures on silicon wafer using MEMS fabrication, and the second part is epitaxial ZnO with doping Al nanostructures on ITO glass using aqueous solution. The effects of the growth temperature, growth concentration, Al-doped for ZnO epitaxial growth, and AZO microharvesting are determined. Results show the percent transmittance decreases with increasing growth concentration ratio and the peak intensity of the (002) orientation increased with increasing growth temperature. The ZnO doped Al with zigzag structures have good efficiency of microharvesting due to its larger geometrical strain to area ratio.

Abstract: Fabrication, nanoindentation characteristics, and optical spectroscopy of patterned ITO for multi-touch panel are investigated. The fabrications were carried out in two parts. The first part fabricates the high/low impedances of ITO patterns on silicon wafer, and the second part sputters the ITO patterns on PET film using MEMS fabrication. The array strips of ITOs on the PET film are defined as contact areas and row electrodes of scanning lines. The ITO patterns on the glass substrate include the contact areas, the narrow wires for high impedance, and the column electrodes of scanning lines for low impedance. The nanoindentation characteristics of load-unload regions generated elastic energy dissipation, which is attributed to higher elastic response, frictional energy, stiffness, and compressive plastic deformation. The maximum transmittance is 74.2% at the wavelength of about 692 nm due to a thicker ITO and Al films.

Abstract: The necessity of the Li-ion battery balancing is elaborated by this paper. It also introduces the classification of the balancing method existed and compares the advantages and disadvantages of various balancing circuit. By comparison, we focus on researching on the inductor-based active balancing of Li-ion battery, and prospect the direction of the balancing circuit.

Abstract: As a modern nondestructive testing technology,acoustic emission which is the important research of fracture mechanics analysis method and the effective ways of evaluation, can convenient to discrimination of concrete structures, properties and internal defects of concrete material. Firstly this article expounded the research progress of the acoustic emission at home and abroad in the field of concrete, especially in the field of research progress of concrete dam.Through the improvement of testing equipment and testing system, concrete fracture parameters had been introduced into the acoustic emission experiments. Not only can they control the loading rate in the test accurately, but also can monitor the real-time of crack state.The specimens can be accurately judged for the specimen cracking and instability and failure of the moment and characteristics.According to the concrete fracture critical state of acoustic emission characteristics identification, fracture criterion of acoustic emission of concrete had been established.Experimental results showed that the acoustic emission characteristic parameters can be accurate judged on time and in good agreement with traditional strain measurements. This criterion is more intuitive and easier for operation. Thus acoustic emission provides a theoretical and technical support in the concrete application of the fracture parameters test.

Abstract: The grinding experiments of Quartz Fiber-Reinforced Quartz Composites（QFRQC） were conducted on MK9025 NC optical curve grinding machine. Grinding forces were measured by KISTLER dynamometer and the morphologies of the grinding surface were observed with Hatchi S-4800 SEM. In this paper, the effect of grinding orientation on the ground surface damage of QFRQC was discussed. Grinding orientation has a big influence on the ground surface damage. When grinding orientation is perpendicular to fiber orientation, the surface of the workpiece is poor; By contrast, when grinding orientation is parallel to fiber orientation, the surface of the workpiece is good; when grinding is on the fiber end-faces, the surface of the workpiece is best.

Abstract: Lead-free multiferroic magnetoelectric composites were prepared by incorporating the dispersed 0.4CoFe₂O₄ ferromagnetic nanoparticles into 0.6(K_0.5Na_0.5)NbO₃-LiSbO₃ ferroelectric micromatrix. From the x-ray diffraction analysis, it was observed that almost no chemical reaction occurs between the ferrite and the ferroelectric materials used to form the composite. Dielectric properties as a function of frequency were measured. The magnetoelectric couple effect was given as a function of magnetic field with a maximum magnetoelectric voltage coefficient of 15.01mV·cm^-1·Oe^-1 at 1kHz, which was a very high value in the lead-free magnetoelectric composites system for the potential use on actuators and sensors, etc.

Abstract: Quantum computation is based on transformation of quantum states. Quantum bits are two-level quantum systems, and as the simplest elementary building blocks for a quantum computer, they provide a convenient labeling for pairs of states and their physical realizations. Closed quantum systems evolve unitarily as determined by their Hamiltonians, but to perform quantum computation one must be able to control the Hamiltonian to effect an arbitrary selection from a universal family of unitary transformations.

Abstract: Study on multivariate calibration for infrared spectrum of coal was presented. The discrete wavelet transformation as pre-processing tool was carried out to decompose the infrared spectrum and compress the data set. The compressed data regression model was applied to simultaneous multi-component determination for coal contents. Compression performance with several wavelet functions at different resolution scales was studied, and prediction ability of the compressed regression model was investigated. Numerical experiment results show that the wavelet transform performs an effective compression preprocessing technique in multivariate calibration and enhances the ability in characteristic extraction of coal infrared spectrum. Using the compressed data regression model, the reconstructing results are almost identical compared to the original spectrum, and the original size of the data set has been reduced to about 5% while the computational time needed decreases significantly.

Abstract: The effect of sodium sulfate on the dispersion of polycarboxylate superplasticizer (PC) was studied in this paper. The study of fluidity of cement paste shown that the carboxyl groups did more to improve the fluidity of cement paste than the sulfonic groups, and a quick loss of fluidity was much more likely arisen by slufonic groups in PC comparing with the carboxyl groups. The methods of zeta potential and fluidity of cement paste were applied to investigate the dispersal ability of cement particles when different PC used in the present of different concentration of sodium sulfate. The result showed that the sulfonic group was more sensitive to sodium sulfate than carboxyl groups in PC.