Guangdong Dongguan Quality Supervision Testing Center

Dongguan, China

Guangdong Dongguan Quality Supervision Testing Center

Dongguan, China
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Dong M.,Beijing University of Technology | Dong M.,State Key Laboratory of Solid State Lighting | Iervolino E.,Peking University | Iervolino E.,Guangdong Dongguan Quality Supervision Testing Center | And 4 more authors.
Sensors and Actuators, A: Physical | Year: 2016

With the increasing public awareness of the impact of particulate matter (PM) on human health, real-time monitoring of PM exposure level has attracted more interest than ever before. While a great deal of effort has been put into the miniaturization of PM sensors, a wider range of applications is still hindered by big form factor and high cost. In this paper a novel design of PM sensor based on silicon microfabrication is presented. Silicon microfabrication and assembly process enables relatively small form factor and low cost. The operation principle of the sensor is light scattering method, an indirect way of measuring PM concentration. Silicon-based microfluidics serve as air flow channel and provide sealed sensing chamber for collecting scattered light by aerosol particles. The main chip components are integrated in the form of bare dies, reducing the size of the whole system. The main body of the sensor possesses small size of 15 × 10 × 1 mm3, enabling easy integration into portable and wearable electronics. The light source in the sensor consumes less than 5 mW of power and the total power consumption is still low enough to make it suitable for battery-powered devices. In-lab and field testing and calibration results have shown that the sensor can achieve an accuracy of less than 10 μg/m3 and prompt response (within s) to particle concentration changes. Detailed design, fabrication as well as testing results will be explained in this paper. © 2016 Elsevier B.V. All rights reserved.

Zou W.-Q.,Jinan University | Zou W.-Q.,Guangdong Dongguan Quality Supervision Testing Center | Zhang Z.-G.,Jinan University | Yang H.,Jinan University | And 3 more authors.
China Foundry | Year: 2016

In the present research, high chromium cast irons (HCCIs) were prepared using the lost foam casting (LFC) process. To improve the wear resistance of the high chromium cast irons (HCCIs), mechanical vibration was employed during the solidification of the HCCIs. The effects of vibration frequency on the microstructure and performance of the HCCIs under as-cast, as-quenched and as-tempered conditions were investigated. The results indicated that the microstructures of the LFC-produced HCCIs were refined due to the introduction of mechanical vibration, and the hardness was improved compared to that of the alloy without vibration. However, only a slight improvement in hardness was found in spite of the increase of vibration frequency. In contrast, the impact toughness of the as-tempered HCCIs increased with an increase in the vibration frequency. In addition, the wear resistance of the HCCIs was improved as a result of the introduction of vibration and increased with an increase in the vibration frequency. © 2016, Foundry Journal Agency. All rights reserved.

Shi B.-Y.,National Paper Products Quality Supervision Inspection Center | Wang Y.-F.,Guangdong Dongguan Quality Supervision Testing Center
17th IAPRI World Conference on Packaging 2010 | Year: 2010

According to the general rule of uncertainty evaluation, the uncertainty source of key items of corrugated packaging paper was analyzed by taking machine direction tensile strength of corrugating medium for example. The uncertainty of measurement was evaluated, and the key factors influencing the uncertainty of measurement were found.

Fang F.,Guangdong Dongguan Quality Supervision Testing Center | Zhu W.-J.,Polytechnic University of Mozambique
Wool Textile Journal | Year: 2010

In order to obtain more accurate results in fiber content percentage of material made from wool and viscose fibers blended produts, research has been made to study the solubility of wool fiber and viscose fiber respectively when dissolve in different solvents. When test under the best testing procedure defined, it is found that the deviation in the test results of fiber content percentage of wool and viscose fibers respectively is not more than 2.0%, when using different solvents; acid/chloride zinc, 75% sulphuric acie, 2.5% sodium hydroxide and 59.5% sulphuric acid.

Fang F.,Guangdong Dongguan Quality Supervision Testing Center | Liu Y.-J.,Polytechnic University of Mozambique | Wang D.,Polytechnic University of Mozambique
Wool Textile Journal | Year: 2014

For the sake of the quantitative method's applicability about wool, nylon, acrylic and polyester mixing fabrics in actual testing analyses, different methods were attempted to verify the results through the study on standard of FZ/T 01026-2009: Textiles-Quantitive chemical analysis-Quaternary fibre mixtures. The results indicated the existence of possible bias when chose the sequential solubility method A→B→C from the standard of FZ/T 01026-2009. However, the accurate experimental data and good reproducibility would be realized when adjust the program for A→B→D or B→A→D, and the result could be tested with distribution t.

Hu Y.-J.,Guangdong Dongguan Quality Supervision Testing Center | Qin Y.-L.,Guangdong Dongguan Quality Supervision Testing Center | Lai Y.-D.,Guangdong Dongguan Quality Supervision Testing Center
Modern Food Science and Technology | Year: 2014

A method was developed for the simultaneous determination of chromium (III) and chromium (VI) in dairy products by high performance liquid chromatography (HPLC) coupled with inductively coupled plasma-mass spectrometry (ICP-MS). The sample was boiled in EDTA buffer solution, cooled down and centrifuged at 8000 r/min for 10 min to separate the protein. Then the supernatant was filtrated through 0.45 μm filter membrane, and chromium (III) and chromium (VI) were simultaneously extracted. Using NH4NO3 as mobile phase (pH=7.0~7.2), Chromium (III) and chromium (VI) were separated and detected in 4 min by HPLC-ICP-MS at a flow rate of 0.6 mL/min. The effects of various pretreatment conditions on test results were researched. The amount of EDTA should be excessive to eliminate the influence of calcium, magnesium and other elements. The complexation rate of EDTA with Chromium (III) was significantly increased by boiling, but the time should not be too long, and 2~3 min was appropriate. The two chromium species had good recoveries and separation effect under pH 7.0~7.2.The results showed that the linear ranges for Chromium (III) and chromium (VI) were between 0.2 and 20 μg/L with linear coefficients more than 0.9995, and the detection limits were 0.034 and 0.066 μg/L. The method had a simple pretreatment procedure, high sensitivity and good accuracy and precision.

Wang Y.-F.,Guangdong Dongguan Quality Supervision Testing Center | Shi B.-Y.,Guangdong Dongguan Quality Supervision Testing Center | Yu W.-M.,Guangdong Dongguan Quality Supervision Testing Center
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2013

Solid-phase extraction and HPLC were applied to the determination of acrylamide in paper. Acrylamide in paper was extracted with ultrapure water at 60°C, the aqueous extract was centrifuged and filtrated with 0.45 μm filter membrane, and then concentrated by Nitrogen evaporators. The concentrated liquid was purified by solid-phase extraction (SPE) and determined by HPLC. The limit of detection (LOD) of the developed method was 10 μg/kg. This method has the advantages of convenient operation, high sensitivity, excellent accuracy and good reproducibility and is therefore suitable for the determination of acrylamide in paper.

Sun J.,South China Agricultural University | Wu J.,South China Agricultural University | Wang X.,Guangdong Dongguan Quality Supervision Testing Center | Gu J.,South China Agricultural University | Gao Z.,South China Agricultural University
Revista Brasileira de Botanica | Year: 2015

Wood anatomy of 56 species from 11 genera of Lauraceae collected from Yunnan, China were investigated by light and scanning electron microscopy. Detailed descriptions and comparisons of wood anatomy of different species are given in the paper to help better identification of Lauraceae wood. The qualitative and quantitative data show that wood structures are very similar among the Lauraceae studied. They are almost diffuse-porous, mainly solitary, minority radial, or diagonal multiples. Vessels have simple perforation and scalariform perforation, and the bars of scalariform perforation have bifurcations. The intervessel pits are almost alternate. Wood rays are uniseriate and multiseriate, with the former being relatively rare. All species have axial parenchyma, most of which are vasicentric. The species of Beilschmiedia and Syndiclis marlipoensis also have marginal parenchyma. Oil and mucilage cells are common in axial parenchyma and ray cells. Wood fibers are composed of libriform fibers and fiber tracheids. Many species have abundant septate fibers. Individual differences are found in several species, which may be related to genetic or environmental factors. We have roughly concluded that Beilschmiedia and S. marlipoensis have a close affiliation for they both have simple perforated plates and marginal parenchyma but with no septate fibers. Almost all species of Litsea, Neolitsea, and Actinodaphne obovata have septate fibers, simple and scalariform perforate plate, and scanty paratracheal and vasicentric parenchyma, indicating that they might be sister taxa. © 2015, Botanical Society of Sao Paulo.

Xiong J.,Guangdong Dongguan Quality Supervision Testing Center | Xie S.,South China University of Technology | Lai Y.,Guangdong Dongguan Quality Supervision Testing Center
Chinese Journal of Chromatography (Se Pu) | Year: 2011

A method based on dispersive liquid-liquid microextraction-gas chromatography-mass spectrometry ( DLLME-GC-MS) was developed for the simultaneous determination of trace 2, 4-dinitrotoluene (2, 4-DNT/ and tris(2-chloroethyl) ester (TCEP) in environmental water samples. The types of extraction solvent; dispersive solvent; extraction time and ionic strength were investigated and optimized to obtain the best extraction efficiency for the target analytes. The analysis performance evaluation and the real sample analysis were performed as follows: 0. 8 mL of ethanol as dispersive solvent and 60 μL of chloroform as extraction solvent were rapidly added into 5. 0 mL of the aqueous solution; and the solution was vibrated about 120 s and centrifuged. Then the sediment phase to be analyzed was directly injected into a GC-MS. Under the optimized conditions, the limits of detection (LODs, S/N = 3) for the target analytes were 0. 01 μg/L and 0. 04 μg/L with the enrichment factors (EFs) of 96. 6 and 127. 5. The real environmental water samples were analyzed and the recoveries of 102. 1% - 110. 9% were obtained. The method is simple; fast; efficient and inexpensive.

Shi B.,Guangdong Dongguan Quality Supervision Testing Center | Wang Y.,Guangdong Dongguan Quality Supervision Testing Center | Chuai C.,Tianjin University of Science and Technology
5th International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2011 | Year: 2011

Two types of waste plastics were used in this study: polyethylene (PE) and polypropylene (PP). This paper described pyrolysis of plastic waste materials with and without catalyst. The influence of the production of liquid was investigated from plastic wastes by various catalysts. On the laboratory condition, using self-making PZSM-5 zeolite as catalyst, the yield of liquid product was highest. © 2011 IEEE.

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