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Zheng P.,Shenyang University of Technology | Bao X.,Shenyang University of Technology | Cui F.,Shenyang Chemical Industry School
Applied Mechanics and Materials | Year: 2011

The thermal deformation error that is the biggest error of effecting the machining precision of Direct-drive A/C Bi-rotary Milling Head was narrated in brief. Based on the introduce of the study status on the thermal error compensation techniques of CNC Machine tool, the momentum of thermal deformation of Bi-rotary Milling Head was analyzed. According to the Trigonometric Relations in A/C axis rotation angle of Bi-rotary Milling Head and the momentum of thermal deformation in Bi-rotary Milling Head and X Y Z -axis respectively, a thermal error compensation model was established to make the Machine tool to compensate for thermal errors in X Y Z -axis. © (2011) Trans Tech Publications. Source


Gao Y.,Shenyang University of Chemical Technology | Gong J.,Northeast Normal University | Fan M.,Shenyang Chemical Industry School | Fang Q.,Shenyang University of Chemical Technology | And 3 more authors.
Materials Research Bulletin | Year: 2012

In this work, multicolor and monodisperse Lu 2O 3:Ln 3+ (Ln 3+ = Eu 3+, Tb 3+, Yb 3+/Er 3+, Yb 3+/Tm 3+, and Yb 3+/Ho 3+) microspheres were prepared by a homogeneous precipitation method followed by a subsequent calcination process. X-ray diffraction (XRD), Fourier transformed infrared (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), photoluminescence (PL) spectra, and cathodoluminescence (CL) spectra were employed to characterize the samples. Upon ultraviolet and low-voltage electron beams excitation, Lu 2O 3:Ln 3+ (Ln 3+ = Eu 3+ and Tb 3+) samples exhibit respective bright red (Eu 3+, 5D 0 → 7F 2) and green (Tb 3+, 5D 4 → 7F 5) down-conversion (DC) emissions. Under 980 nm NIR irradiation, Lu 2O 3:Ln 3+ (Ln 3+ = Yb 3+/Er 3+, Yb 3+/Tm 3+, and Yb 3+/Ho 3+) exhibit characteristic up-conversion (UC) emissions of green (Er 3+, 4S 3/2, 2H 11/2 → 4I 15/2), blue (Tm 3+, 1G 4 → 3H 6) and yellow-green (Ho 3+, 5F 4, 5S 2 → 5I 8), respectively. These finding may find potential applications in bioanalysis, optoelectronic and nanoscale devices, field emission displays, and so on. © 2012 Elsevier Ltd. All rights reserved. Source


Gao Y.,Shenyang University of Chemical Technology | Fan M.,Shenyang Chemical Industry School | Fang Q.,Shenyang University of Chemical Technology | Yang F.,Shenyang University of Chemical Technology
New Journal of Chemistry | Year: 2014

Well-dispersed, uniform Lu2O3 hollow microspheres have been successfully fabricated via a urea-based precipitation method in the presence of colloidal PS microspheres as templates, followed by subsequent heat treatment. The structure, morphology, formation process, and fluorescent properties are well investigated using various techniques. The results indicate that the hollow microspheres can be well indexed to the cubic Lu 2O3 phase. The hollow Lu2O3 microspheres with a uniform diameter of about 2.2 μm maintain the spherical morphology and good dispersion of the PS spheres template. The shell of the hollow microspheres consists of numerous nanocrystals with the thickness of approximately 20 nm. Moreover, the possible formation mechanism of evolution from the PS spheres to the amorphous precursor and to the final hollow Lu 2O3 microspheres has also been proposed. Under 980 nm laser diode excitation, Lu2O3:Yb3+/Tm 3+, Lu2O3:Er3+ and Lu 2O3:Yb3+/Er3+ products are mainly dominated by blue, green and red light emissions, respectively. The ratio of the intensity of green luminescence to that of red luminescence decreases with an increase of the concentration of Yb3+ in Lu2O 3:Er3+ samples. Furthermore, the UC white light was successfully obtained in the Lu2O3:Yb3+/Er 3+/Tm3+ system by adjusting the relative doping concentration of Yb3+, Er3+ and Tm3+. The obtained UC white light has CIE-x = 0.3478 and CIE-y = 0.3143, which are very close to the standard equal energy white light illuminate (x = 0.33, y = 0.33). Because of abundant luminescent colors from RGB to white in Lu2O 3:Yb3+/Er3+/Tm3+ samples under 980 nm laser diode (LD) excitation, they can potentially be used as fluorophores in the fields of color displays, backlights, UC lasers, photonics, and biomedicine. This journal is © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2014. Source


Gao Y.,Shenyang University of Chemical Technology | Fan M.,Shenyang Chemical Industry School | Fang Q.,Shenyang University of Chemical Technology | Song B.,Shenyang University of Chemical Technology | Jiang W.,Shenyang University of Chemical Technology
Journal of Nanoscience and Nanotechnology | Year: 2013

Highly uniform and well-dispersed LuPO4 hollow nanospheres were successfully synthesized via a facile solution-phase method by utilizing the colloidal spheres of Lu(OH)CO3 as a sacrificial template and NH 4H2PO4 as a phosphorus source. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transformed infrared (FT-IR), photoluminescence (PL) spectra, and cathodoluminescence (CL) spectra were employed to characterize the samples. The result indicates that the hollow LuPO4 spheres can be indexed to the tetragonal phase. The hollow LuPO4 spheres with diameter of about 300 nm become larger with respect to the sacrificial template. The shell of the hollow microspheres consists of numerous nanorods with the thickness of approximately 10 nm. Moreover, the possible formation mechanism of the evolution from Lu(OH)CO3 spheres to the final hollow LuPO 4 hollow spheres has been proposed. In addition, upom ultraviolet (UV) and low-voltage electron beams excitation, 5 mol% Eu3 and 5 mol% Tb3doped LuPO4 samples exhibit strong orange-red and green emission, corresponding to the characteristic lines of Eu3 and Tb3 under UV excitation, respectively, which may find potential application in the fields of color display and biomedicine. Copyright © 2013 American Scientific Publishers. Source


Gao Y.,Shenyang University of Chemical Technology | Fan M.,Shenyang Chemical Industry School | Fang Q.,Shenyang University of Chemical Technology | Han W.,Shenyang University of Chemical Technology
New Journal of Chemistry | Year: 2013

In the present paper, YbVO4 microcrystals with diverse morphologies, sizes and dimensions have been synthesized via a mild and controllable hydrothermal process using trisodium citrate (Na3Cit) as an organic additive. The phases, morphologies, sizes, and photoluminescent properties of the as-prepared products were well characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and up-conversion (UC) luminescence, respectively. The results indicate that the morphology and size of the YbVO4 samples can be tuned in a controlled manner by altering the amount of Na3Cit, pH value of the initial solution, and the reaction time. The possible formation mechanism for products with diverse architectures has been presented in detail. The UC luminescence properties as well as the emission mechanisms of YbVO4:Ln3+ (Ln 3+ = Er3+, Tm3+, Ho3+) microcrystals were systematically investigated, which show green (Er3+, 4S3/2, 2H11/2 → 4I15/2), blue (Tm3+, 1G4 → 3H6) and red (Ho3+, 5F 5 → 5I8) luminescence under 980 nm NIR excitation. Furthermore, the experimental results also reveal that the optical properties of the YbVO4:Er3+/Ho3+ phosphors with different morphologies are strongly dependent on their morphologies and sizes. © 2013 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique. Source

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