Advanced Materials Research Vols. 311-313

Abstract: Milling force is an important parameter during machining, which is directly related to the tool deformation, the tool life, the quality of the part surface, cutting heat, etc. In actual production, the cutting force on inside corner is more complex than the linear. For lack of the accurate cutting force information, there is liable to cause over-cut and owes-cut, rough surface, cutter breaking phenomenon. According to the structural characteristics of the corner, the cutting force model is established, which cutting force is further subdivided and the overall prediction accuracy is improved. Effects of different helix angle and forward amount each gear on cutting force. A good agreement is shown between the model simulation and the results of the experimental ones. The research provides a theoretical basis of predicting the cutting force on inside corner, and it is also helpful for further and practice.

Abstract: Single-phase nanocrystalline YIG powders have been successfully synthesized through chemical co-precipitation methods. The influence of pH value of the precursor solution and calcinating conditions (temperatures ranging from 700 to 900°C and times ranging from 0.5 to 12 hours) on the purity and grain size of the single-phase nanocrystalline YIG powders were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) technique. The results show that a pure single-phase YIG powder was obtained as the pH value of precursor solution above 10 and the YIG grain grows bigger as calcinating temperature and time increased. Finally, the optimal condition to form single-phase nanocrystalline YIG with the smallest grain size is calcinating at 750°C for 7 hours.

Abstract: Solar cell, One-dimensional nanostructure, Surface reflectance, Plane-wave expansion Abstract. In this paper, we design a one-dimensional (1-D) a-Si nanostructure, orthogonizing the two processes to avoid their competition. Shapes of the structure include 1-D nanowire and 1-D nanocone. With the method of plane-wave expansion, the influence of different parameters on surface reflectance is systematically discussed. It is verified that, under the given geometrical parameters, 1-D nanocone solar cell will perform better than 1-D nanowire one and flat one in optical absorption enhancement.

Abstract: Friendship Avenue bridge was a concrete-filled steel tube arch bridge (CFSTAB). As a new type of bridge, CFSTAB was widely constructed and rapid developed in China. Because of its merits, CFSTAB was constructed much more in China. With the span increasing rapidly, and the bridge gradually becoming thin, the long span CFSTAB should be paid more attention for its performance of aseismic, wind resistance and vehicle-bridge vibration.This article described the basic method of dynamic analysis for CFSTAB. And the Friendship Avenue CFSTAB was taken as an example, such as the choice of element types, conducted boundary condition and applying load were described in process of modeling FEM for it, and of which the dynamic characteristics was analyzed by finite element software ANSYS.

Abstract: This paper introduces the production method of calcium lanthanum permanent magnetic ferrite coupled with soft magnetic ferrite components. This type of calcium lanthanum permanent magnetic ferrite has excellent magnetic properties. Soft magnetic ferrite components (CoFe₂O₄) can be coupled effectively with permanent magnetic ferrite (the main ingredients: Ca_0.548Sr_0.120La_0.542Fe₁₂O₁₉) by adding the additives (SrB₂Si_0.67O_5.34 and CaSiO₃), which can promote the sintering of the liquid permanent magnetic ferrite. This calcium lanthanum permanent magnetic ferrite can be significantly improved in the microstructure, density, magnetic properties.

Abstract: This paper describes the principle of measuring small displacement of the object by using electronic speckle pattern interferometry (ESPI). The piezoelectric constant of Lead Lanthanum Zironate Titanate(PLZT) piezoelectric ceramics is determined with ESPI. Compared with other methods , this method is simpler and is operated more easily.The accuracies of ESPI and electrical method are almost at the same level, which shows that it is avalible to measure piezoelectric constant.

Abstract: TThe paper mainly discuses the design and application of the hydrology telemetry system based the GPRS technology. Owing to the low power consuming CPU and application of GPRS, the telemetry system realizes the data acquisition, remote control and data communication; it plays an important role in the accurate monitoring and control of Poyang Lake

Abstract: It is reported that a pitch gradient is formed in a side chain cholesteric liquid crystalline polymer (ChLCP) through a novel method. Heating up the ChLCP within the temperature range of the cholesteric (Ch) phase leads to the first availability of its planar texture. Then, the ChLCP film with the planar texture is cooled down to its glassy (G) state in line with the temperature difference between the upper and the bottom substrates. The SEM image indicates clearly a pitch gradient perpendicular to the substrates, and the results of transmission spectra show that the reflective bandwidth of the ChLCP film with the pitch gradient is greatly broadened.

Abstract: A novel phosphor, Gd₂MoB₂O₉:Eu³⁺ has been synthesized by solid-state reaction and its photoluminescence in UV-VUV range are investigated. A sharp excitation band is observed in the region of 120–135 nm, which is related to the charge-transfer (CT) band of Gd³⁺. The broad band around 135–160 nm can be assigned to the BO₃ host absorption. The broad bands around 248 nm are assigned to the CT band of Eu³⁺-O2-. The phosphors emit strong red luminescence centered at about 591 nm, 614 nm and 626 nm due to the⁵D₀–⁷F₁ and ⁵D₀–⁷F₂ transitions of Eu³⁺. The main emission peak under 254 and 147 nm excitations also shows different shifts with increasing Eu³⁺ concentration. This could be due to the different luminescence sites selected at high doping concentrations of Eu³⁺. Gd₂MoB₂O₉:Eu³⁺ shows the pure red emission under both 254 and 147 nm excitations.

Abstract: The nucleation and crystallization of Li₂O-Al₂O₃-SiO₂(LAS) glass ceramic with one(P₂O₅, TiO₂, ZnF₂) and two nucleating agents(P₂O₅+TiO₂, P₂O₅+ZnF₂) are investigated by the differential thermal analysis(DTA)，X-ray diffraction(XRD) and the scanning electron microscopy(SEM). Research results show that the LAS glass ceramic with nucleating agent of P₂O₅ can obtain ideal micro spherical crystal grains and the crystallization behavior can be better controlled.