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Zhang X.-T.,Tianjin University | Zhang X.-T.,Military Transportation Academy | He Z.,Tianjin University | Liu Y.-N.,Tianjin University | Wang Y.,Tianjin Engineering Technical Institute
19th International Conference on Industrial Engineering and Engineering Management: Engineering Economics Management | Year: 2013

In the context of "labor shortage" in china, dispatched employees' voluntary turnover in electronics industry is researched. In view of the characteristics of dispatched employees, employee retention model considered all possible variables is established based on analysis of traditional employee turnover model. 300 questionnaires are handed out by random sampling in three typical electronics industries in Tianjin. The key factors affecting dispatched employees' voluntary turnover are figured out by ANOVA and multiple regressions. Moreover, the motivation of turnover and some feasible suggestions are discussed, which can be referred by enterprises to improve job satisfaction and retention will of dispatched employees. © Springer-Verlag Berlin Heidelberg 2013. Source


Zhang X.-T.,Tianjin University | Zhang X.-T.,Military Transportation Academy | He Z.,Tianjin University | Zhang C.,Tianjin University | Wang Y.,Tianjin Engineering Technical Institute
International Asia Conference on Industrial Engineering and Management Innovation: Core Areas of Industrial Engineering, IEMI 2012 - Proceedings | Year: 2013

A new model-free control chart called Chi square control chart is proposed. Firstly, the autocorrelation function is used to measure the stability of the process. Secondly, appropriate delay time is selected to reduce the data correlation and make data approximately satisfy IID assumption. Then, the Chi square statistics for monitoring are designed through data matching based on phase space reconstruction. Guidelines for designing the control chart are presented by an example of AR (1) process. Result shows that, the control chart cannot only avoid the false alarm when the process is under control, but also can timely detect the variation of the process out of control. This method doesn't need model fitting, and the efficiency in data usage is high for its autoregressive character, which makes it suitable for quality monitoring online. © Springer-Verlag Berlin Heidelberg 2013. Source


Wang W.,China Institute of Technology | Yang H.,China Institute of Technology | Yan Y.,China Institute of Technology | Wang M.,Tianjin Engineering Technical Institute
Petroleum Processing and Petrochemicals | Year: 2014

A macromonomer 4-allyl-heptylphenol AHP was synthesized. The hydrophobic association acrylamide copolymer (PAMA) was synthesized using acrylamide (AM), AHP and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) by aqueous micelle free radical copolymerization technique. The macromonomer and copolymer were characterized by 1 H-NMR and FT-IR. The effect of AHP dosage, polymer concentration, NaCl concentration and temperature on the viscosity of copolymer solution was tested. The results indicate that the copolymer exhibits good thickening and salt tolerant property by addition of AHP. The apparent viscosity of 1 500 mg/L PAMA with AHP (mole fraction of 1%) in 20 000 mg/L brine solution is up to 178. 6 mPa • s at 53 °C ,and the viscosity of 1 500 mg/L PAMA with AHP (mole fraction of 1%) in 7 000 mg/L brine solution is 110. 8 mPa • s at 90 °C. PAMA displays a good heat-resistant property. Source


Huang L.,Dalian Maritime University | Cheng L.,Dalian Maritime University | Yu H.,Dalian Jiaotong University | Zhang J.,Dalian Maritime University | And 12 more authors.
Optics Communications | Year: 2012

Eu(DBM) 3Phen/PS (DBM = dibenzoylmethide; Phen = 1,10-phenanthroline; PS = polystyrene), a novel fluorescent fiber, was synthesized through electrospinning technology. In order to analyze the fluorescent fiber Eu(DBM) 3phen/PS, Scanning Electron Microscope (SEM), fluorescence spectra and fluorescence decay curve were measured. The optical transition intensity parameters Ω λ (λ = 2, 4 and 6) were calculated according to the transition intensities of 5D 0 → 7F J (J = 2, 4 and 6). The radiative transition properties of 5D 0 level including transition rates, fluorescence branching ratios and radiative transition lifetime were also calculated. The evaluation of the results suggested that the novel fluorescent fiber Eu(DBM) 3Phen/PS may be a potential efficient luminescent material. © 2011 Elsevier B.V. All rights reserved. Source


Huang L.,Dalian Maritime University | Cheng L.,Dalian Maritime University | Yu H.,Dalian Jiaotong University | Zhou L.,Dalian Jiaotong University | And 9 more authors.
Physica B: Condensed Matter | Year: 2011

Mono-dispersed microspheres of ternary complex Eu(DBM)3phen (DBM=dibenzoylmethide; phen=1,10-phenanthroline) were prepared through a facile process. The obtained sample was characterized by means of X-ray powder diffraction (XRD) and scanning electron microscope (SEM). And the luminescence properties of the Eu(DBM)3phen were investigated by the fluorescence spectra and the fluorescence decay. According to JuddOfelt theory, the optical transition intensity parameters Ωλ (λ=2, 4 and 6) were obtained to be 20.99×10-20, 0.98×10-20 and 1.79×10-20 cm2, respectively. The radiative transition properties of 5D0 level, including transition rates, branch ratios and radiative transition lifetime were calculated. As a potential material for microsphere lasers, the optical gain performance for 5D0→7F2 transition was also evaluated. © 2011 Elsevier B.V. All rights reserved. Source

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