Jilin Province Product Quality Supervision Test Institute

Changchun, China

Jilin Province Product Quality Supervision Test Institute

Changchun, China

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Jiang W.,Jilin University | Liu J.,Jilin University | Tao X.,Jilin University | Wang Y.,Jilin Province Product Quality Supervision Test Institute | And 3 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

To obtain the optimal essential oils extraction conditions with supercritical carbon dioxide, uniform design and the artificial neural network (back propagation, BP) were applied in extraction of ledum palustre L. Number of neuron in hide layer and some functions for learning, training and transfer were chosen through one-factor experimental design. Four factors (six levels in each factor) were considered in uniform design. Five factors (extraction time, extraction temperature, extraction pressure, particle size, kind of leaves or stems) were considered in BP network. The average error of network prediction was 0.0116. Analysis of correlation and comparison showed that the experimental values and the predicted values were not significant. The effect of each factor on extraction yield and the optimal extraction conditions were studied with this model. The highest extraction yield of essential oils from ledum palustre L. stems could reach 1.82% at 17.5°C, 375 bar for 1 h while the essential oils extraction yield of ledum palustre L. leaves was 2.65% at 15°C, 275 bar for 3 h. It may provide a new study method for the extraction of volatile oil of ledum palustre L.


Xu Y.,Jilin University | Zheng W.-T.,Jilin University | Yu W.-X.,Jilin University | Hua L.-G.,Jilin Province Product Quality Supervision Test Institute | And 2 more authors.
Chemical Research in Chinese Universities | Year: 2010

Poly(vinylidene fluoride)(PVDF)/multi-walled carbon nanotube(MWCNT) nanocomposites were prepared by means of ultrasonic dispersion method. X-ray diffraction(XRD) results indicate that incorporating MWCNTs into PVDF caused the formation of β phase. A thermal annealing at 130 °C confirmed that the β phase was stable in the nanocomposites. Differential scanning calorimetry(DSC) results indicate that the melting temperature slightly increased while the heat of fusion markedly decreased with increasing MWCNT content. The tensile strength and modulus of PVDF were improved by loading the MWCNTs. The scanning electron microscopy(SEM) observations showed that MWCNTs were uniformly dispersed in the PVDF matrix and an interfacial adhesion between MWCNT and PVDF was achieved, which was responsible for the enhancement in the tensile strength and modulus of PVDF.


Xu D.,Jilin University | Wang Y.,Jilin Province Product Quality Supervision Test Institute | Zhang Y.,Jilin University | Zhang G.,Jilin University | And 4 more authors.
Chemical Research in Chinese Universities | Year: 2010

Composite membranes based on sulfonated silica/sulfonated poly(ether ether ketone)(SPEEK) were prepared by means of sol-gel method so as to gain a high conductivity and reasonable methanol permeability. The sulfonated silica is generated in situ via the hydrolysis of sulfonated 3-anminopropyl triethoxysilane(KH550) synthesized newly from 3-aminopropyl triethoxysilane and 1,4-butane sultone. The membrane with a silica mass fraction of 5% exhibits a conductivity of 0.187 S/cm at 80 °C and a methanol coefficient with 9.72×10-7 cm2/s. The composite membranes show improved condutive ability and better selectivity that can be promisingly used in direct methanol fuel cell.


Chai B.,Jilin University | Xiang Y.,Jilin Province Product Quality Supervision Test Institute | Ma W.,Jilin University | Yu C.,Jilin University | Kou Z.,Jilin University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2016

Hydrodynamic coupling is used for power transmission in heavy duty drives, such as power stations, ship propulsion, band conveyers, mills, and larger transport vehicles. Their hydrodynamic principle enables a low-wear torque to convert from a drive to a load. The flow in a hydrodynamic coupling is one of the most complex problems encountered in engineering fluid mechanics. The external performance of hydrodynamic coupling is determined by its internal distribution of flow field. It is very important to make a deep research on the internal distribution of flow field for the performance improvement and structural optimization in the design of hydrodynamic coupling. Numerical simulation is a main way to study the internal flow field of hydrodynamic coupling. The results of numerical simulation that are calculated by different turbulence models are quite different. In order to obtain accurate and reliable results of numerical simulation, it is a key to choose a reasonable turbulence model. The integrated computer engineering and manufacturing (ICEM) software was used to mesh the whole flow channel model of hydrodynamic coupling by hexahedral grids, and the total mesh number was 470 944 and the number of nodes was 521 887. Numerical simulation of three-dimensional unsteady turbulent flows in hydrodynamic coupling was carried out by numerically solving the Navier-Stokes equations in a rotating coordinate system. In order to analyze the applicability of different turbulence models in the calculation of flow field in hydrodynamic coupling, 3 different turbulence models (standard k-ε model, detached eddy simulation model, large eddy simulation model) were chosen to simulate the internal flow field of square cavity hydrodynamic coupling under braking condition. The quantity and quality of mesh was consistent during the numerical simulation of different turbulence models. The velocity field and vorticity field of radial section in hydrodynamic coupling were simulated and extracted through ANSYS CFX software. In addition, the transparent prototype of hydrodynamic coupling was manufactured and used in the complex flow test experiment, the internal flow field of hydrodynamic coupling under braking condition was tested based on particle image velocimetry (PIV), the characteristics of flow images were extracted by image processing technique, and the velocity field and vorticity field of radial cross-section were calculated by image cross correlation algorithm. Then numerical simulation and PIV experimental results were compared. The PIV test results were used as the evaluation criteria, and the differences of numerical simulation results by 3 kinds of turbulence models were analyzed. Moreover, the applicability of 3 turbulence models was analyzed. The results showed that the simulation results by standard k-ε model were far different from PIV experimental results, the distribution of flow field in main flow region simulated by the large eddy simulation model was much more real than others, the simulation results could be used to explain the law of multi-scale vortex movement and the mechanism of energy dissipation in the main flow region, and the high-gradient flow field distribution of near-wall area and corner area could be captured more accurately by the detached eddy simulation model. The results of analysis will provide a basis for accurate calculation of flow field and performance prediction of hydrodynamic coupling. © 2016, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved.


Li Y.,Harbin Engineering University | Li Y.,Jilin University | Li M.,Jilin University | Zheng W.,Jilin University | And 3 more authors.
8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8 | Year: 2013

The NiTi thin films were deposited onto copper substrates by magnetron sputtering. X-ray diffraction profile Fourier analysis method has been used to study the mechanical properties of deformation NiTi thin films. Tensile tests were carried out on CSS-44100 electron universal test-machine. From the dislocation data it has been found that the dislocation density and the deformation storage energy density increased with elongation increased. The calculated results showed the microhardness values were not in a good agreement with the measured values. The oxide layer on the surface of NiTi thin film affects the measured values of microhardness. The average dislocation density and the average elastic stored energy density values gradually increase as strain increases in the strain range of 0 to 6.78% and rapidly increase in the strain range of 6.78% to 8.21%. The peak coefficient of friction corresponds with the oxide layer of the films. There is a rapid increase in the average coefficient of friction after strain range of 4.80%. This raise could be attributed to the increase of average elastic stored energy density values with elongation.


Guan S.,Jilin University | Li P.,Jilin University | Luo J.,Chongqing Medical and Pharmaceutical College | Li Y.,Jilin Province Product Quality Supervision Test Institute | And 6 more authors.
Free Radical Research | Year: 2010

This group has invented a novel deuterohemin containing peptide deuterohemin-AlaHisThrValGluLys (DhHP-6), which has various biological activities including protection of murine ischemia reperfusion injury, improving cell survival and preventing apoptosis. It was hypothesized that DhHP-6 is beneficial on the lifespan of Caenorhabditis elegans (C. elegans) and increases their resistance to heat and oxidative stress. C. elegans were treated with different concentrations of DhHP-6. Survival time and sensitivity to heat and paraquat were investigated. The data demonstrated that the mean survival time of C. elegans was significantly increased (p < 0.05) in the DhHP-6 treated group compared with the control group. The maximum lifespan was not affected by DhHP-6 treatment. DhHP-6 improved the survival rate of C. elegans in the acute heat stress (35°C) and rescued the C. elegans' sensitivity to paraquat in acute oxidative stress. Superoxide dismutase 3 (SOD-3) protein was up-regulated by DhHP-6 treatment. It was further demonstrated that stress resistance genes such as hsp-16.1, hsp-16.49 and sir-2.1 were regulated by DhHP-6. DAF-16 and SIR-2.1 genes are essential for the beneficial effect of DhHP-6. Therefore, the investigation into the beneficial effect of DhHP-6 on C. elegans' lifespan has the potential to develop novel drugs to prevent ageing. © 2010 Informa UK Ltd.


Wu W.,Changchun University of Chinese Medicine | Lu Z.,Changchun University of Chinese Medicine | Teng Y.,Changchun University of Chinese Medicine | Guo Y.,Jilin Province Product Quality Supervision Test Institute | And 2 more authors.
Journal of Chromatographic Science | Year: 2016

Ginseng flower bud as a part of Panax ginseng has received much attention as a valuable functional food with medicinal potential. A few studies focused on systematic and comprehensive studies on its major ingredients. This study aims to rapidly characterize ginsenosides in ginseng flower buds and provide scientific basis for developing functional food, exploiting pharmaceutical effects and making full use of ginseng resources. A rapid resolution liquid chromatography coupled with quadrupole-time-of-flight mass spectrometry (RRLC-Q-TOF-MS) method was developed for rapid qualitative and quantitative analysis of ginsenosides in ginseng flower buds. The compounds were identified by comparing retention time of the reference standards, accurate mass measurement and the fragment ions obtained from RRLC-Q-TOF-MS/MS analyses. A total of 14 kinds of ginsenosides were identified and 5 kinds of malonyl-ginsenosides were first tentatively identified in ginseng flower buds. Ten kinds of main ginsenosides were quantitatively analyzed. The developed RRLC-Q-TOF-MS method was demonstrated as an effective analytical means for rapid characterization of the ginsenosides in flower buds of P. ginseng. The research result is valuable for quality control, assessment of authenticity and stability evaluation of ginseng flower buds. © 2015 The Author 2015. Published by Oxford University Press.


PubMed | CAS Changchun Institute of Applied Chemistry, Jilin Province Product Quality Supervision Test Institute and Changchun University of Chinese Medicine
Type: Evaluation Studies | Journal: Journal of chromatographic science | Year: 2016

Ginseng flower bud as a part of Panax ginseng has received much attention as a valuable functional food with medicinal potential. A few studies focused on systematic and comprehensive studies on its major ingredients. This study aims to rapidly characterize ginsenosides in ginseng flower buds and provide scientific basis for developing functional food, exploiting pharmaceutical effects and making full use of ginseng resources. A rapid resolution liquid chromatography coupled with quadrupole-time-of-flight mass spectrometry (RRLC-Q-TOF-MS) method was developed for rapid qualitative and quantitative analysis of ginsenosides in ginseng flower buds. The compounds were identified by comparing retention time of the reference standards, accurate mass measurement and the fragment ions obtained from RRLC-Q-TOF-MS/MS analyses. A total of 14 kinds of ginsenosides were identified and 5 kinds of malonyl-ginsenosides were first tentatively identified in ginseng flower buds. Ten kinds of main ginsenosides were quantitatively analyzed. The developed RRLC-Q-TOF-MS method was demonstrated as an effective analytical means for rapid characterization of the ginsenosides in flower buds of P. ginseng. The research result is valuable for quality control, assessment of authenticity and stability evaluation of ginseng flower buds.


du Y.,Changchun University of Technology | Zhang J.,Jilin Province Product Quality Supervision Test Institute | Zhou C.,Changchun University of Technology
Polymer Bulletin | Year: 2015

Waterborne polyurethanes (WPUs) derived from polytetramethylene ether glycol (PTMG), 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, 1,4-butanediol and dimethylolpropionic acid were synthesized. Hydroxyl-terminated polydimethylsiloxane (PDMS) was introduced to replace part of PTMG as soft segment. The effects of [–NCO]/[–OH] (R value) and PDMS content on structure and properties of WPU were studied using FTIR, thermal analysis, mechanical test, contacting angle testing and scan electron microscopy (SEM). The results revealed that the trend of particles fusion in WPU film decreased with the increment of R value by SEM photos. The replacement of PTMG by PDMS led to an obvious change in surface properties of films and distinct phase separation was observed by SEM photos when the PDMS content increased. This is the result when the content of PDMS was 2.0 wt% and R value is 1.2, the film exhibited excellent mechanical properties with the highest elongation at break and improved tensile strength. © 2015 Springer-Verlag Berlin Heidelberg


Mao Y.,University of Chinese Academy of Sciences | Mao Y.,Jilin Province Product Quality Supervision Test Institute | Bao Y.,University of Chinese Academy of Sciences | Yan L.,Jilin Province Product Quality Supervision Test Institute | And 6 more authors.
RSC Advances | Year: 2013

A novel carbon dot-polyaniline (CD-PANI) composite has been successfully synthesized through an efficient one-pot chemical-oxidation polymerization and subsequently applied as a pH responsive material. PANI has a role in effectively passivating the CDs, which greatly enhances the luminescence intensity of the CDs. The pH-switched luminescence and pH sensing properties of the CD-PANI composite were investigated via detecting the fluorescence response on changing the solution pH. The switching operation exhibited excellent reversibility, and the luminescence intensity of the CD-PANI composite showed linear relationships with the solution pH in the range of 3.50-5.50 and 6.00-12.00. The reasons for the presence of two linear regions on the plot were further discussed in detailed. A probable mechanism was speculated to involve both the conjugation between the CDs and PANI, as well as the transfer between different PANI forms (emeraldine base and emeraldine salt). Moreover, OH- ions could serve as the fluorescence quencher of the CD-PANI composite. The luminescence intensity of the CD-PANI composite displayed a good linear relationship with OH- ions in the concentration range of 5-800 mM. © 2013 The Royal Society of Chemistry.

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