Testing and Technology Center for Industrial Products

Shenzhen, China

Testing and Technology Center for Industrial Products

Shenzhen, China
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Zhang W.,Testing and Technology Center for Industrial Products | Zhu Y.,Wuhan University | Wang C.,Testing and Technology Center for Industrial Products | Li L.,Testing and Technology Center for Industrial Products | And 2 more authors.
Chinese Journal of Chromatography (Se Pu) | Year: 2014

Leather is one of the important exporting products to European Union (EU), and tris(2-chloroethyl)phosphate (TCEP) is a commonly used flame retardant in leather and leath-er products. Recently, TCEP has been classified as a kind of substance of very high concern (SVHC) by EU for its carcinogenicity and reproductive toxicity. But to date, there is not a rec-ognized method for the determination of TCEP in leather and leather products due to the seri-ous matrix interferences and relatively low recovery of TCEP. In this work, a home-made mixed-mode sorbent (Silica-WCX) with carboxyl and alkyl groups was tested as the sorbent of solid phase extraction (SPE) to extract TECP from leather. The results demonstrated that, making the carboxyl groups protonized under acidic condition, Silica-WCX exhibited better ex-traction performance towards TCEP over some frequently used commercial sorbents tested. Af-ter the optimization of the SPE conditions based on Silica-WCX, a method of gas chromatogra-phy / mass spectrometry (GC-MS) was established for the determination of TCEP in leather samples. The linear range for TCEP ranged from 0.10 to 100.0 μg / L and the limit of quantifica-tion (LOQ, S / N = 10) was 44.46 ng / kg. The recoveries of TCEP spiked in samples at varied levels were in the range of 91.45% -99.98% with the relative standard deviations (RSDs) of 4.33%-5.97%. The method is simple, sensitive and reliable for the analysis of TCEP in leather and leather products.


Nie Z.,CAS Shenzhen Institutes of Advanced Technology | Nie Z.,Shenzhen Key Laboratory for Low Cost Healthcare | Ma J.,Testing and Technology Center for Industrial Products | Li Z.,CAS Shenzhen Institutes of Advanced Technology | And 5 more authors.
Sensors (Switzerland) | Year: 2012

This paper presents the first characterization and modeling of dynamic propagation channels for human body communication (HBC). In-situ experiments were performed using customized transceivers in an anechoic chamber. Three HBC propagation channels, i.e., from right leg to left leg, from right hand to left hand and from right hand to left leg, were investigated under thirty-three motion scenarios. Snapshots of data (2,800,000) were acquired from five volunteers. Various path gains caused by different locations and movements were quantified and the statistical distributions were estimated. In general, for a given reference threshold è = -10 dB, the maximum average level crossing rate of the HBC was approximately 1.99 Hz, the maximum average fade time was 59.4 ms, and the percentage of bad channel duration time was less than 4.16%. The HBC exhibited a fade depth of -4 dB at 90% complementary cumulative probability. The statistical parameters were observed to be centered for each propagation channel. Subsequently a Fritchman model was implemented to estimate the burst characteristics of the on-body fading. It was concluded that the HBC is motion-insensitive, which is sufficient for reliable communication link during motions, and therefore it has great potential for body sensor/area networks. © 2012 by the authors; licensee MDPI, Basel, Switzerland.


Zedong N.,CAS Shenzhen Institutes of Advanced Technology | Jingjing M.,Testing and Technology Center for Industrial Products | Ivanov K.,CAS Shenzhen Institutes of Advanced Technology | Lei W.,CAS Shenzhen Institutes of Advanced Technology
IEEE Antennas and Wireless Propagation Letters | Year: 2014

This letter investigated characteristics of human body as a communication channel at 45 MHz, in different surrounding environments, taking into account parameter changes arising from body activities. A large amount of measurement data has been collected in five real environments for random body motions: in a conference hall, laboratory, grove, playground, and an anechoic chamber. The received power for nine human body communication (HBC) channels was acquired, with more than 2\,700\,000 data snapshots in total. Environmentally independent analysis of the mean and standard deviations of the received power was performed. The results of applying the Nakagami function were satisfying for the conference hall; the results of applying Lognormal function showed that it was a suitable model for the rest of the investigated environments. Lognormal and Weibull functions served well for level crossing rate (LCR) and average fade duration (AFD) in all environments. In our research, we observed lower values of LCR and AFD in HBC, compared to their usual values for ISM-band communication. © 2014 IEEE.


Wang C.,Testing and Technology Center for Industrial Products | Li L.,Testing and Technology Center for Industrial Products | Lin J.,Testing and Technology Center for Industrial Products | Chu N.,Testing and Technology Center for Industrial Products | Xie T.,Testing and Technology Center for Industrial Products
Chinese Journal of Chromatography (Se Pu) | Year: 2016

An effective method of ultra performance liquid chromatography-orbitrap high resolution mass spectrometry (UPLC-Orbitrap HRMS) was established for the simultaneous determination of the residues of eight isocyanates in synthesized leathers. Residual isocyanates in synthesized leathers were ultrasonically extracted using dichloromethane as the extraction solvent and derivatized by 9-(methylaminomethyl) anthracene (MAMA) at the same time. The derivatives were concentrated and analyzed by UPLC-Orbitrap HRMS technique. The concentration of each analyte was calibrated by the external standard method. The derivatives were separated on a Hypersil GOLD column (100 mm×2.1 mm, 1.9 μm) with a gradient elution of acetonitrile and 0.1% (v/v) formic acid aqueous solution, and analyzed by Orbitrap HRMS in positive ESI mode. The qualitative analyses were carried out by the exact masses of quasi-molecular ions and the retention times. The quantitative analyses were carried out by the peak areas in extracted chromatograms. The limits of quantification (LOQs) were 0.2 μg/kg for all the eight isocyanates. The analytes were spiked in blank samples at three levels and the average recoveries varied from 85.41% to 95.53% with the relative standard deviations (RSDs) of 2.55%-6.87%. The proposed method was applied in the analysis of synthesized leather products and isophorone diisocyanate (IPDI) was detected in a real sample. The proposed method was accurate and sensitive, and applicable to the determination of the residues of isocyanates in synthesized leathers.


Wang C.,Testing and Technology Center for Industrial Products | Zhang W.,Testing and Technology Center for Industrial Products | Li L.,Testing and Technology Center for Industrial Products | Shen Y.,Testing and Technology Center for Industrial Products | And 3 more authors.
Chinese Journal of Chromatography (Se Pu) | Year: 2014

An effective method was established for the simultaneous determination of residual glycol ethers in leather and leather products by gas chromatography/mass spectrometry. Glycol ethers in leather and leather products were ultrasonically extracted at 45 V, using ethyl acetate as the extraction solvent. The extracts were purified by solid phase extraction (SPE) columns, and then analyzed by gas chromatography/mass spectrometry in selected ion monitoring mode. The content of each analyte was calibrated by external standard method. The limit of detection of ethylene glycol ethyl ether (EGEE) was 0. 10 mg/kg under the condition of signal to noise (S/N) of 3 and the limits of the other 11 glycol ethers were all less than 0.05 mg/kg. The spiked recoveries varied from 81. 2% to 95. 59* at three different spiked levels with the relative standard deviations (RSDs) ranged from 1. 4% to 6. 6%. The proposed method is simple, rapid and accurate, with the limits of detection much less than the requirements of the Regulation Concerning Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) of European Union. It is applicable to the determination of residual glycol ethers in leather and leather products, and provides a reference for the relevant testing standards.


Tang X.-C.,Liaoning University | Zhang M.,Liaoning University | Ren F.-S.,Liaoning University | Gao S.,Iwaki Meisei University | Tong C.-F.,Testing and Technology Center for Industrial Products
2010 International Conference on Mechanic Automation and Control Engineering, MACE2010 | Year: 2010

A method of forming an elliptical involutes gear is proposed based on Visual LISP implanting AutoCAD in this paper. First, a geometric model is established according to a pinion cutting principle of the involutes profile and geometric location relationship between pinion cutter and pitch curve of elliptical gear. It makes pinion cutter do pure rolling on a pitch curve of elliptical gear. Then the arc length of cutter on the pitch curve is equal to the length of cutter rotating around its rotation center in order to guarantee the generating grinding teeth between the pinion cutter and the blank in processing. Finally, teeth profile of elliptical involutes gear is formed utilizing graphics movement simulation in AutoCAD by Visual LISP programming. ©2010 IEEE.

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