Tianjin Institute of Technical Physics

Tianjin, China

Tianjin Institute of Technical Physics

Tianjin, China
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Wang Y.-J.,Tianjin Polytechnic University | Wang B.,Tianjin Polytechnic University | Liu W.,Tianjin Institute of Technical Physics
Acta Polymerica Sinica | Year: 2013

A series of molecularly imprinted polymers were synthesized via the electron beam radiation polymerization of functional monomer (methacrylic acid) and crosslinking agent (ethylene glycol dimethacrylate) in the presence of quercetin-Ni (II) as template and were used as a highly selective separation material for quercetin which is an important active ingredient of Chinese herbs. The interaction between quercetin and Ni(II) was investigated with UV-Visible spectroscopy, which reveals the formation of 1:2 complex in the system. At the same time, the ternary complexation of quercetin, Ni(II) and methacrylic acid was verified by similar methods. The characterization of the molecularly imprinted polymer prepared and pure quercetin was analyzed by Fourier transform infrared spectra. The result indicated that the template molecule could be fixed in molecularly imprinted polymer and also could achieve being eluted. Furthermore, the transmission electron microscopy and adsorption dynamic experiments were used to characterize the effect of radiation dose on the morphology and adsorption capacity of molecularly imprinted polymer. The result showed that the three-dimensional cross-linked network structure of the molecularly imprinted polymer prepared in condition of 20 kGy radiation dose was more uniform, and the presence of these internal pores greatly increased the surface area of molecularly imprinted polymer and reduced the embedding of imprinting sites, which was conducive to adsorb the template molecule. In addition,the selective adsorption experiments showed that the molecularly imprinted polymer prepared exhibited significant adsorption selectivity for quercetin compared with the quercetin' s structural analogs (baicalein and naringenin) in the presence of Ni(H) and the max adsorption amount reached 82.22 μ,mol/g. The separation factors were 3.915 and 5.443, respectively.

Yu L.,Tianjin Polytechnic University | Wang F.,Tianjin Polytechnic University | Niu P.,Tianjin Polytechnic University | Xu W.,Tianjin Polytechnic University | And 3 more authors.
Guti Dianzixue Yanjiu Yu Jinzhan/Research and Progress of Solid State Electronics | Year: 2010

The influence of low-energy low-dose electron-beam irradiation on the light emitting diode (LED) has been studied in this paper. Using the space electron-beam irradiation simulated by ion-beam emitted from experimental accelerator, the LED emitting different color light were irradiated under the different electron irradiation dose. We compare the optical and electronical character results of the initial and irradiated LED. The results demonstrate that the light intensity of irradiated LED increases and the discrete property of the statistical light intensity of plenty of LED is better. During the current accelerated aging experiment, the light intensity of the irradiated LED trends to significant decreasing compared with the initial LEDs. Using the electron beam irradiation mechanism the experiment results are discussed and analysed.

Gao Y.,Tianjin University | Liu F.,Tianjin University | Wang J.L.,Tianjin University | Du B.X.,Tianjin University | And 2 more authors.
Proceedings of the 2016 IEEE International Conference on Dielectrics, ICD 2016 | Year: 2016

Epoxy-based nanocomposites working in the irradiation environment could be exposed to a great risk of degradation induced by partial discharge. It is then of necessity to investigate the effect of irradiation on the resistance to partial discharge of epoxy nanocomposites. In this paper, epoxy/Al2O3 nanocomposites have been prepared to estimate the influence of electron beam on the erosion of partial discharge. The content of the Al2O3 nano-particle was set at 1wt%, 4wt% and 7wt%, respectively, and the total irradiation dose was 0 kGy, 100 kGy and 500 kGy. Partial discharge erosion of the nanocomposites was attained by employing the needle-to-plate electrode system, the erosion profile was measured and the maximum erosion depth was obtained and compared. The test results showed that the maximum erosion depth increased with the total dose varying from 0 kGy to 100 kGy, but decreased with the total dose changing from 100 kGy to 500 kGy. It is suggested that the chemical structure of the material is altered by means of radiation-induced chemical reactions, which in turn influences the electrical properties of the nanocomposites. © 2016 IEEE.

Liu H.P.,Tianjin University of Science and Technology | Dong J.,Tianjin University of Science and Technology | Xu T.,Tianjin Institute of Technical Physics | Wei F.R.,Tianjin University of Science and Technology | Jiang P.,Tianjin University of Science and Technology
Advanced Materials Research | Year: 2011

In this paper, Provolone Cheeses were radialized by 60Co-γ of different doses, and they were stored. The impact of texture in the cheese after radialization was studied, the peculiar smell resulted from radialization were analyzed, the mechanisms and preventing methods were discussed. Main conclusions are as follows: Volatile flavors of Provolone cheeses of different radialization doses were detected by HS-SPME-GC-MS. The result showed that the variety and quantity of volatile flavors were changed obviously after radicalization: esters and phenols were reduced numerously; while aldehydes, ketones, aromatic hydrocarbons and alkyl olefin had increased significantly; Irradiation cause sulfur compounds such as sulfur alcohols and sulfur ketone. © (2011) Trans Tech Publications.

Tong Y.,Tianjin Institute of Technical Physics | Chen J.,Tianjin Institute of Technical Physics | Sun L.,Tianjin Institute of Technical Physics | Yu X.,Tianjin Institute of Technical Physics | Wang X.,Tianjin Institute of Technical Physics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

The optical glass is hard, brittle and difficult to process. Based on the method of rotating ultrasonic drilling, the study of single factor on drilling elongated holes was made in optical glass. The processing equipment was DAMA ultrasonic machine, and the machining tools were electroplated with diamond. Through the detection and analysis on the processing quality and surface roughness, the process parameters (the spindle speed, amplitude, feed rate) of rotary ultrasonic drilling were researched, and the influence of processing parameters on surface roughness was obtained, which will provide reference and basis for the actual processing. © 2014 SPIE.

Ma J.,Huazhong University of Science and Technology | Yu W.,Huazhong University of Science and Technology | Zhou Z.,Tianjin Institute of Technical Physics | Yang W.,Huazhong University of Science and Technology | Wu X.,Huazhong University of Science and Technology
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2016

Dual wedge scanning is a broad prospect method of next generation Laser imaging system. Due to the unique scanning mode and imaging characteristics, data of dual wedge Laser imaging system is sensitive to parameters and environment, and it is significant in both theory and application to research its feature of time and space. Based on the imaging principle of dual wedge scanning, the dynamic imaging process was modeled and a simulation system in three-dimensional environment was designed. Based on the imaging principle of dual wedge scanning, the dynamic imaging process was modeled and a simulation system in three-dimensional environment was designed. Then the point cloud data simulated in different scenes of distinct parameters was analyzed in several aspects. The research result can be used to verify the performance of the three-dimensional object detection and recognition algorithms, in addition, it has reference value for design and development of the dual wedge scanning Laser imaging system. © 2016, The Editorial Board of Journal of System Simulation. All right reserved.

Liu W.,Tianjin Institute of Technical Physics | Hao J.-G.,Tianjin Institute of Technical Physics
Journal of Tianjin Polytechnic University | Year: 2011

In order to solve the problem that the polyester fibers are easily melting and catching fire, the electron accelerator is used to radiate the polyester fibers for modification. The influence of different radiation amounts and different monomers (methacrylic acid, acrylic acid, acrylamide) to the graft ratio is studied, and the properties of the fiber after grafting are analyzed. The results show that the graft ratio raises with the radiation amounts and monomers concentration moderately increasing; the fiber after radiation doesn't have the droplet phenomenon, and the flame retardant property of the fiber is improved.

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