Nanjing Institute of Product Quality Inspection

Nanjing, China

Nanjing Institute of Product Quality Inspection

Nanjing, China
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Xie P.,Nanjing Institute of Product Quality Inspection | Zhou J.,Nanjing Institute of Product Quality Inspection | Wang J.,Nanjing Institute of Product Quality Inspection
Proceedings of 2016 IEEE Advanced Information Management, Communicates, Electronic and Automation Control Conference, IMCEC 2016 | Year: 2016

SDN (Software Defined Network) is the important part of Future Network, and the OpenFlow soft switch which separates the control plane from the data plane is the key instrument. In this paper, the OpenFlow switch are analyzed, the main performance parameters are throughput, packet loss and time-delay, the influence factors are load, packet size and the transforming packet quantity. Kernel Partial Least Squares (KPLS) algorithm is proposed and applied to study the performance model of the OpenFlow soft switch. The nonlinear relationship of the measured data was transformed into quasi-linear, the simulation of the algorithm shows that the performance model has a good performance. © 2016 IEEE.


Yue K.,Nanjing University of Technology | Cheng X.,Nanjing Institute of Product Quality Inspection | Wang L.,Nanjing University of Technology | Lu W.,Nanjing University of Technology | And 3 more authors.
Ranshao Kexue Yu Jishu/Journal of Combustion Science and Technology | Year: 2016

Fast-growing poplar wood was modified with boric acid phenol formaldehyde resin (BPF) at different concentrations. In comparison with structural Douglas fir and Chinese fir, the effect of modification on the mechanical and burning behavior of poplar wood was studied. The results show that the strength level of poplar wood cannot meet the demand of related standards. The modified poplar wood with 20% BPF reaches TB11, and both 30% and 40% BPFpoplar wood reaches TB13. The oxygen indexes of 20%, 30% and 40% BPF-poplar wood increase by 97.37%, 113.68% and 128.42%, respectively. Poplar wood shows higher heat release rate (HRR), total heat release (THR) and production rate of CO2 (PR-CO2) than both Douglas fir and Chinese fir. The BPF modification can effectively reduce the combustibility and delay the ignition time of poplar wood, and that higher BPF concentration has a better fireretardant behavior. The HRR peak value of 40% BPF-poplar wood is reduced by 31.22%, which is 14.33% higher than that of Douglas fir. The THR value of 40% BPF-poplar wood is similar to that of Douglas fir. The PR-CO2 peak value of 40% BPF-poplar wood is reduced by 30.57%, which is 6.01% higher than that of Douglas fir. The residual weight of 40% BPF-poplar wood is increased by 64.83%. Its burning behavior reaches and even is higher than the level of conventional building structural wood materials. © 2016, Editorial Office of the Journal of Combustion Science and Technology. All right reserved.


Wang R.,Nanjing Forestry University | Wang R.,CAS Nanjing Institute of Soil Science | Zhu X.,Nanjing Forestry University | Zhu X.,Nanjing Institute of Product Quality Inspection | And 5 more authors.
Journal of Soils and Sediments | Year: 2017

Purpose: The purpose of this study was to elucidate the mechanisms for pectin-enhanced adsorption of heavy metal cations on variable charge minerals. Materials and methods: Batch experiments were conducted to investigate the adsorption of pectin and copper(II) by amorphous Fe/Al hydroxides. The morphology, mineralogy, and functional groups of pectin–Fe/Al hydroxides were examined using X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy analysis. Results and discussion: The amount of pectin adsorbed by amorphous Al(OH)3 was much greater than that by amorphous Fe(OH)3 at pH values between 3.5 and 6.5 due to the higher positive charge density on Al(OH)3 and greater electrostatic attraction between the hydroxide and pectin compared with Fe(OH)3. The addition of pectin decreased the positive surface charge on amorphous Fe and Al hydroxides. The presence of pectin enhanced the adsorption of Cu(II) by the Fe and Al hydroxides. The increase in Cu(II) adsorption on amorphous Fe hydroxide was more obvious at low pH values than at higher pH values, while an opposite changing trend was observed for amorphous Al hydroxide. At pH 3.9, 4.3, and 4.9, pectin increased Cu(II) adsorption by Fe hydroxide from 24.4, 76.6, and 177.0 mmol/kg to 61.6, 98.8, and 192.0 mmol/kg, i.e., Cu(II) adsorption was increased by 37.2, 22.2, and 15.0 mmol/kg, respectively. At pH 4.3 and 4.9, pectin increased Cu(II) adsorption by Al hydroxide from 3.7 and 27.0 mmol/kg to 17.3 and 69.4 mmol/kg, i.e., Cu(II) adsorption was increased by 13.6 and 42.4 mmol/kg, respectively. The greater adsorption of pectin by Al hydroxide was mainly responsible for the larger enhancement of pectin on Cu(II) adsorption on Al hydroxide at higher pH values compared with Fe hydroxide. Conclusions: The adsorption of pectin on Fe and Al hydroxides decreased the positive charge on the hydroxides and thus enhanced the adsorption of Cu(II) by the hydroxides. © 2017 Springer-Verlag Berlin Heidelberg


Zhou J.,Nanjing University of Technology | Yue K.,Nanjing University of Technology | Lu W.,Nanjing University of Technology | Chen Z.,Virginia Polytechnic Institute and State University | And 4 more authors.
Journal of Adhesion Science and Technology | Year: 2017

Wood moisture content (MC) affects the glued laminated beam (glulam) bonding strength. Selected adhesives were Phenol-Resorcinol-Formaldehyde (PRF) and Melamine-Urea-Formaldehyde (MUF) adhesives with 1, 1.5 and 2% (w/w) carboxymethyl cellulose (CMC) formic acid solutions. Douglas fir (pseudotsuga menziesii) from North America was used in the test. The bonding behavior of these adhesives with wood at 12 and 18% MC were investigated. The study focused on the effect of 18% MC on shear strength performance of MUF and PRF adhesives and optimizing the formula of CMC formic acid solution. Compressive shear strength of wood with MUF adhesive with 2% (w/w) formic acid solution at 12 and 18% MC stabilized at 10.6 and 10.0 MPa, respectively, which were 17 and 16% higher than that with PRF adhesive at the same condition. At 12–18% MC, MC had a little effect on bonding strength. However, 18% MC wood with PRF adhesive had 52.2% less initial strength increasing rate than that of 12% MC wood. 18% MC wood with MUF adhesives with 1, 1.5 and 2% (w/w) CMC formic acid solutions had 16.0, 15.5 and 27.0% less initial strength increasing rates than that of 12% MC wood, respectively. MUF adhesive using 2% CMC formic solution required the shortest press time at 12 and 18% MC about 1.6 and 2.7 h, respectively. The strength of PRF adhesive was significantly affected by wood MC and enough press time is essential for the proper bonding strength. © 2017 Informa UK Limited, trading as Taylor & Francis Group


PubMed | CAS Nanjing Institute of Soil Science, Nanjing Institute of Product Quality Inspection and Nanjing Forestry University
Type: Journal Article | Journal: Environmental science and pollution research international | Year: 2016

Batch experiments were conducted to investigate cadmium(II) (Cd(II)) adsorption by two variable-charge soils (an Oxisol and an Ultisol) as influenced by the presence of pectin. When pectin dosage was less than 30gkg(-1), the increase in Cd(II) adsorption with the increasing dose of pectin was greater than that when the pectin dosage was >30gkg(-1). Although both Langmuir and Freundlich equations fitted the adsorption isotherms of Cd(II) and electrostatic adsorption data of Cd(II) by the two soils well, the Langmuir equation showed a better fit. The increase in the maximum total adsorption of Cd(II) induced by pectin was almost equal in both the soils, whereas the increase in the maximum electrostatic adsorption of Cd(II) was greater in the Oxisol than in the Ultisol because the former contained greater amounts of free Fe/Al oxides than the latter, which, in turn, led to a greater increase in the negative charge on the Oxisol. Therefore, the presence of pectin induced the increase in Cd(II) adsorption by the variable-charge soils mainly through the electrostatic mechanism. Pectin increased the adsorption of Cd(II) by the variable-charge soils and thus decreased the activity and mobility of Cd(II) in these soils.


Zhang C.,Nanjing University | Zhang C.,Nanjing Southeast University | Zhang C.,Nanjing Institute of Product Quality Inspection | Fang X.,Nanjing Institute of Product Quality Inspection | And 2 more authors.
Journal of AOAC International | Year: 2015

Real-time PCR amplification of mitochondria gene could not be used for DNA quantification, and that of single copy DNA did not allow an ideal sensitivity. Moreover, cross-reactions among similar species were commonly observed in the published methods amplifying repetitive sequence, which hindered their further application. The purpose of this study was to establish a short interspersed nuclear element (SINE)-based real-time PCR approach having high specificity for species detection that could be used in DNA quantification. After massive screening of candidate Sus scrofa SINEs, one optimal combination of primers and probe was selected, which had no cross-reaction with other common meat species. LOD of the method was 44 fg DNA/reaction. Further, quantification tests showed this approach was practical in DNA estimation without tissue variance. Thus, this study provided a new tool for qualitative detection of porcine component, which could be promising in the QC of meat products.


PubMed | Nanjing Institute of Product Quality Inspection and Nanjing Southeast University
Type: | Journal: Food chemistry | Year: 2015

Using murine meat to substitute mutton has been identified as a new type of meat fraud in China, yet no detection method for murine species has been reported. Here, three kinds of rodent were used as target species to establish a murine-specific real-time PCR method of detection. The mitochondrial cytochrome b gene (cytb) of each target was sequenced and a TaqMan probe was designed based on the cytb. Simultaneously, an internal positive control (IPC) plasmid along with its respective probe were designed to monitor the PCR reaction. As a result, the duplex real-time PCR system was verified to be specific. The limit of detection (LOD) was lower than 1 pg of DNA per reaction and 0.1% murine contamination in meat mixtures. Standard curves were generated for a quantitative analysis. Thus, this study provided a new tool to control the quality of meat products for official and third-party laboratories.


Gao R.,Nanjing Normal University | Gao R.,Nanjing Institute of Product Quality Inspection | Zhang N.,Nanjing Normal University
Atomic Spectroscopy | Year: 2015

A different analytical line pair is required when the Pd 340.45-nm line, as recommended by ISO regulation 11495:2008, is not available on an inductively coupled plasma optical emission spectrometer (ICP-OES) for the determination of Pd in palladium jewellery alloys. This work selected Pd 342.124 nm and Y 371.030 nm as the optimal analytical line pair from 21 spectral lines of palladium and 7 spectral lines of yttrium based on recoveries, relative standard deviations (RSD), spectral interferences, simultaneous detection principle of the analyte and the internal standard signals. The recoveries of the line pair were in the range of 101.6∼101.9% and the RSD was 0.2% (n=10). This method is complementary to the ISO 11495:2008 regulation.


Gao R.-F.,Nanjing Normal University | Gao R.-F.,Nanjing Institute of Product Quality Inspection | Gao M.-C.,Nanjing Institute for Food and Drug Control | Ling R.,Nanjing Institute for Food and Drug Control | Zhang N.,Nanjing Normal University
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2016

The measurement uncertainty is a non-negative parameter associated with the result of a measurement that characterizes the dispersion of the quantity values that could reasonably be attributed to the measurand. In the present study measurement uncertainty is estimated using the GUM (ISO/IEC Guide 98: 1993 Guide to the expression of uncertainty in measurement) bottom-up approach. The steps were followed: specifying the measurand; identifying all the associated sources of uncertainty; quantifying the uncertainty components; combining the uncertainty components; determining the extended combined standard uncertainty; reviewing the estimates and reporting the measurement uncertainty. In this process, the major uncertainty components with greater impact were identified; try to eliminate or to reduce the impact of these components can improve measurement methods. Examples were the determination of aluminum in starch and bread crumbs by inductively coupled plasma-mass spectrometry (ICP-MS). The uncertainties of aluminum contents were from measurement repeatability, variability of calibration curve, standard stock solution, dilution, solution volume and sample weighing. The data indicated that the major contributions to the uncertainty budget originating from urel(cAl)1 (the relative standard uncertainty of aluminum content derived from linear least squares calibration), urel(cAl)3 (the relative standard uncertainty of aluminum content derived from the dilution of the standard stock solutions) and urel(rep) (the relative standard uncertainty derived from the repeatability). Based on the analysis of the main individual contributions of each uncertainty source to the total uncertainty value, several modifications were proposed. Firstly helium collision mode was replaced by no gas mode to improve the sensitivity of mass spectrometry. Secondly the number of measurements was increased. Thirdly let the mean of data points in the calibration closer the measurand. Finally the relative error smaller gauges were used. After these modifications, urel(cAl)1, urel(cAl)3 and urel(rep) were from (0.0358, 0.0132, 0.0085) down to (0.0060, 0.0105, 0.0033), respectively; the combined relative standard uncertainty of aluminum was from 0.039 down to 0.013; the expanded uncertainty from 1.8 down to 0.4 mg·kg-1 (coverage factor k=2). The improvement effect was significant. © 2016, Peking University Press. All right reserved.


Zhou J.,Nanjing Institute of Product Quality Inspection | Zhang Z.,State Key Laboratory for Novel Software Technology | Xie P.,Nanjing Institute of Product Quality Inspection | Wang J.,Nanjing Institute of Product Quality Inspection
Proceedings - 2015 IEEE International Conference on Software Quality, Reliability and Security-Companion, QRS-C 2015 | Year: 2015

Since automotive software contains many control flows, symbolic execution is an effective approach to generate test data for it. However, symbolic execution is cost expensive, so it is difficult to apply it directly. Moreover, parameters in automotive software are usually closely related to implement the same function, thus the constraints are dependent on other constraints in the entire path constraint set, which results in traditional optimization techniques, such as constraint independence optimization, could not be used for symbolic execution of automotive software. In this paper, we present a new test data generation approach for automotive software. In our approach, we combine symbolic execution and minimum cut to generate test data for automotive software. We firstly use minimum cut technique to divide the entire path constraint set into two constraint subsets. Then we solve the smaller subset and reuse the solution when solving the entire path constraint set. We believe this approach can not only be faster than solving the entire constraint set directly, but also increase the probability of hitting the cache. © 2015 IEEE.

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