Zhejiang Test Academy of Quality and Technical Supervision

Hangzhou, China

Zhejiang Test Academy of Quality and Technical Supervision

Hangzhou, China
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Mao D.,Anhui University of Science and Technology | Li T.,Anhui University of Science and Technology | Liu H.,Anhui University of Science and Technology | Li Z.,Anhui University of Science and Technology | And 2 more authors.
Colloid and Polymer Science | Year: 2013

PolyHIPEs are highly porous, crosslinked polymer foams typically synthesized within high internal-phase emulsions (HIPEs). Two kinds of polyHIPEs including poly(styrene-divinylbenzene) [P(St-DVB)] and poly(methyl methacrylate-divinylbenzene) [P(MMA-DVB)] foams are synthesized in this work, which are fabricated from HIPEs template via radiation-induced polymerization at room temperature. Traditional free radical polymerization initiated by potassium peroxydisulfate (KPS) at 60 C for producing polyHIPE P(St-DVB) foams is also conducted for comparison. It is found that the amount of emulsifier can be reduced greatly in the radiation-induced polymerization of HIPEs at room temperature, compared with the traditional polymerization approach. Besides, P(MMA-DVB) PolyHIPE foams with a fine microstructure of highly interconnected pores have been successfully fabricated via radiation-induced polymerization in this work, which is usually difficult to be prepared by thermal-initiation method because of the intermediate hydrophobicity of methyl methacrylate monomer. The influences of the fraction of internal aqueous phase and the concentration of emulsifier on the structure and performance of foams are carefully explored. The structure and compression strength of the foams are characterized by scanning electron microscopy and a mechanical testing machine, respectively. [Figure not available: see fulltext.] © 2013 Springer-Verlag Berlin Heidelberg.

Wang X.,Zhejiang Test Academy of Quality and Technical Supervision
Materials Research Bulletin | Year: 2012

Uniform α-Fe 2O 3 particles of different shapes have been synthesized through hydrothermal process. The additives, the type of Fe(III) salts and reaction conditions in hydrothermal process were thoroughly investigated. The crystalline structure and morphology of the as-synthesized powder have been characterized by using X-ray powder diffraction, scanning electron microscopy and field emission scanning electron microscopy. Rod and ellipsoidal-shaped α-Fe 2O 3 were obtained with ferric chloride as a precursor, while only irregular-shaped particles were synthesized by using ferric nitrate as precursors in the absence of NH 4OH. Direct transformation of micro-rod hematite to ellipsoidal particles with FeCl 3 as precursor was also observed by adding NH 4OH. It is shown that the nanorod was formed through presumed directional aggregation of rapidly formed nucleus, while the formation of ellipsoidal hematite particles may undergo a nucleation-aggregation-dissolution-recrystallization process in the presence of ammonium. © 2012 Elsevier Ltd.

Han Y.-G.,Zhejiang Test Academy of Quality and Technical Supervision | Han Y.-G.,Zhejiang University | Wu L.-L.,Zhejiang University
Journal of Electronic Materials | Year: 2011

Two kinds of hybrid ultraviolet (UV) photodetectors based on TiO 2 nanocrystals capped with and without oleic acid (OA) and poly(9,9-dihexylfluorene) (PFH) were prepared from solution and characterized to study the effects of the surface ligand on the device function. Both devices showed obvious photovoltaic effect, high UV-sensitive photoconductivity, and fast response time. The hybrid device containing TiO 2 nanocrystals with bare surface exhibited a photocurrent density of 91 μA/cm 2 at zero bias under 3.2 mW/cm 2 UV irradiation, corresponding to a photosensitivity of 28.4 mA/W. The other device containing OA-capped TiO 2 nanocrystals showed a photocurrent density of 19 μA/cm 2 and a photosensitivity of 5.9 mA/W under the same condition. It was found that capping TiO 2 with OA had a beneficial effect on its solubility in organic solvent. On the contrary, a barrier might be formed, significantly influencing the charge-transfer behavior. This negative effect overcompensated the positive influence due to improved morphology and lowered the photosensitivity of the device. © 2011 TMS.

Han Y.,Zhejiang University | Han Y.,Zhejiang Test Academy of Quality and Technical Supervision | Fan C.,Zhejiang University | Wu G.,Zhejiang University | And 2 more authors.
Journal of Physical Chemistry C | Year: 2011

A highly ordered, vertically oriented TiO2 nanorod array is successfully synthesized on a transparent conductive substrate with a facile, free-template, and low-temperature solution method and applied in the fabrication of a hybrid ultraviolet photodetector with polyfluorene. With TiCl4 treatment, the device exhibits high UV-sensitive photoductivity and fast response time. A maximum response of 33.2 mA/W at 395 nm is reached under zero bias, which provides a novel route to fabricate a low-cost photodetector with large area. © 2011 American Chemical Society.

Shi X.,Zhejiang University | Shen Y.,Zhejiang Test Academy of Quality and Technical Supervision | Zhang J.,Zhejiang University | Qian Z.,Zhejiang University | Peng F.Z.,Michigan State University
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC | Year: 2011

Hybrid Active Power Filters (HAPFs) can effectively suppress harmonic current in power-lines, the compensation precision of which rely heavily on the design of the current loop and dc voltage controllers. In this paper, the operation principle of a transformerless HAPF is introduced and analyzed, and then a double closed loop control strategy with power-line current feedback and the fifth harmonic current feedback is proposed aiming at enhancing filtering characteristics at the fifth harmonic frequency. Finally, a dc voltage regulator is designed based on the system model of dc link voltage control. Experimental results obtained from a 380 V, 20 kVA experimental prototype verify the validity and effectiveness of the proposed control strategies for the transformerless hybrid filter, which has high compensation precision as well as fast dynamic response and also reduces the cost of the equipment since only two phases of power-line current are required to be detected. © 2011 IEEE.

Meng P.,Zhejiang University | Zhang J.,Zhejiang University | Chen H.,Zhejiang University | Qian Z.,Zhejiang University | Shen Y.,Zhejiang Test Academy of Quality and Technical Supervision
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC | Year: 2011

This paper characterized the CM noise generation and coupling mechanism to predict the CM noise in Flyback converter. The spectrum of noise sources are analyzed using bandwidth-effects-FFT and the CM noise coupling paths are identified to build up a new CM noise analysis method. With this CM noise analysis method, the total CM noise and the contributions of all the coupling paths in the converter can be predicted. The performance of CM noise suppression measures can also be diagnosed before practical implementation. This method can provide EMC designers with a costless and time saving solution to design the converter. Experimental illustrations are also included to verify the validity of the proposed CM noise analysis method. Comparison between the measured and predicted results shows that this CM noise modeling method can provide adequate prediction of the CM noise feature for the converter. © 2011 IEEE.

Ding H.,Zhejiang Test Academy of Quality and technical Supervision | Guo L.,Zhejiang Sci-Tech University
Applied Mechanics and Materials | Year: 2013

Compared with double-sided permanent magnet linear synchronous motors(DPMLSM) with long secondary, the short secondary construction also has advantages of high dynamic performance and stable thrust, and is more suitable for the aspect of long-term acceleration. In this paper, magnetic field and characteristic of two different moving-magnet-type double-sided linear synchronous motors were analyzed by using 2D finite element method(FEM). The internal and external permanent magnet motor constructions with the same NdFeB and windings were compared according to flux density and electrical force. It was inferred that internal PM motors can provide the same force with lighter secondary weight and faster response speed. © (2013) Trans Tech Publications, Switzerland.

Wang S.,Zhejiang University | Xu H.,Environmental Science Research and Design Institute of Zhejiang Province | Yao P.,Zhejiang Test Academy of Quality and Technical Supervision | Chen X.,Zhejiang University
Electrochemistry | Year: 2012

Seawater can be used as an electrolyte for Cl 2 evolution, and proper selection of electrode materials is of great importance. In this paper, a new type of dimensionally stable anodes, Ti/RuO 2-IrO 2-Sb 2O 5-SnO 2, was investigated for Cl 2 evolution from seawater. The physicochemical and electrochemical properties were examined, and the electrocatalytic activity for Cl 2 evolution was measured under different conditions. It was shown that the RuO 2-IrO 2Sb 2O 5-SnO 2 coating was compact in microstructure. The current efficiency was 71.2-86.7%, depending on the operational conditions. The anodes were predicted to be able to work effectively for over 6 years at a current density of 1500Am -2 for seawater electrolysis. © The Electrochemical Society of Japan All rights reserved.

Hang Z.,Zhejiang University | Hang Z.,Zhejiang Test Academy of Quality and Technical Supervision | Xiao X.,Zhejiang University | Li S.,Zhejiang University | And 3 more authors.
Journal of Alloys and Compounds | Year: 2012

The as-cast Ti 10V 77Cr 6Fe 6Zr alloy was heat-treated at 1373 K for 8 h or 1523 K for 5 min and then quenched in water. The influence of heat treatment on the microstructure and hydrogen storage properties of Ti 10V 77Cr 6Fe 6Zr alloy was investigated systematically. The results show that all of the as-cast and heat-treated alloys consist of BCC main phase and C14 Laves secondary phase. After heat treatment, the phase abundance of BCC enhances and the plateau region of P-C-T curve is flattened, but the hydrogen absorption capacity is decreased. However, the alloy heat-treated at 1523 K for 5 min achieves a enhanced hydrogen desorption capacity of 1.82 wt.% at 333 K against 0.1 MPa, which is higher than 1.44 wt.% hydrogen desorption capacity of the as-cast alloy. © 2012 Elsevier B.V. All rights reserved.

Jiang K.,Zhejiang Test Academy of Quality and Technical Supervision
Wei sheng yan jiu = Journal of hygiene research | Year: 2011

To establish a multiplex PCR method for simultaneous detection of Salmonella, Shigella, Staphylococcus aureus and Listeria monocytogenes in food. The primers were designed according to the sequences of invA gene of Salmonella, ipaH gene of Shigella, nuc gene of Staphylococcus aureus and hly gene of Listeria monocytogenes, and the reaction system was optimized. No false positive and false negative results occurred during the test of 15 target strains and 17 non-target strains of bacteria, and the molecular weight of PCR products were consistent with expected. The detection limits for each pathogen were at least 1 pg/microl. The sequence analysis of PCR products showed the same sequences with target genes. The test result of 319 samples showed that 4 raw milk samples were contaminated by staphylococcus aureus, and 1 raw pork sample by Salmonella. The established method showed good specificity, and provided an important method for the rapid detection of foodborne pathogens.

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