Jiangsu Marine Resources Development Research Institute

Xinpu, China

Jiangsu Marine Resources Development Research Institute

Xinpu, China
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Wu S.,Jiangsu Marine Resources Development Research Institute | Wu S.,Huaihai Institute of Technology | Huang X.,Jiangsu Marine Resources Development Research Institute
Food Chemistry | Year: 2017

Oligosaccharides were prepared from Crassostrea gigas by hydrolysis of polysaccharide in C. gigas with peroxide oxygen (H2O2). The hydrolysates were cleared of protein, filtered, ultrafiltered and precipitated with absolute ethanol to give C. gigas oligosaccharides (CGOs). Factors affecting CGO yields, i.e., reaction time, temperature, and H2O2 concentration, were optimised as follows: 2.96 h reaction time, 84.71 °C reaction temperature, and 2.46% H2O2 concentration. Under these conditions, the maximum yield of CGOs reached 10.61%. The CGOs were then partially characterised by Fourier transform infrared spectroscopy, UV spectroscopy, monosaccharide composition, and antioxidant activities. Results indicate that CGOs possessed strong hydroxyl radical activity, 2,2-diphenyl-β-picrylhydrazyl-radical-scavenging activity and reducing capacity at a concentration of 100 μg/mL. © 2016 Elsevier Ltd

Yongxian S.,Huaihai Institute of Technology | Yongxian S.,Jiangsu Marine Resources Development Research Institute | Xianjin Z.,Huaihai Institute of Technology
International Journal on Smart Sensing and Intelligent Systems | Year: 2016

In order to reliable data transmission of wireless sensor network (WSN) in indoor environment, the indoor field intensity distribution and transmission characteristics of electromagnetic wave were researched. First of all, the 3D model in specific indoor environment was built by the finite difference time domain method (FDTD).Then, layout of room, different furniture, position of field source and field source frequency had an influence on indoor field intensity distribution that were studied, and the field intensity distribution was simulated by MATALAB. According to simulation of three dimensional field intensity distribution, and it had directly shown that various factors had an influence on the indoor field intensity distribution, thus indoor wireless sensor network nodes can be reasonable deployed by it, the packet loss rate of WSN transmission was reduced from information source, and it provided theoretical basis for further improving WSN information transmission reliability.

Feng L.,Huaihai Institute of Technology | Feng L.,Harbin Institute of Technology | Feng L.,Jiangsu Marine Resources Development Research Institute | Feng L.,The Composites Group | And 2 more authors.
Materials | Year: 2014

Carbon nanofiber (CNF), as one of the most important members of carbon fibers, has been investigated in both fundamental scientific research and practical applications. CNF composites are able to be applied as promising materials in many fields, such as electrical devices, electrode materials for batteries and supercapacitors and as sensors. In these applications, the electrical conductivity is always the first priority need to be considered. In fact, the electrical property of CNF composites largely counts on the dispersion and percolation status of CNFs in matrix materials. In this review, the electrical transport phenomenon of CNF composites is systematically summarized based on percolation theory. The effects of the aspect ratio, percolation backbone structure and fractal characteristics of CNFs and the non-universality of the percolation critical exponents on the electrical properties are systematically reviewed. Apart from the electrical property, the thermal conductivity and mechanical properties of CNF composites are briefly reviewed, as well. In addition, the preparation methods of CNFs, including catalytic chemical vapor deposition growth and electrospinning, and the preparation methods of CNF composites, including the melt mixing and solution process, are briefly introduced. Finally, their applications as sensors and electrode materials are described in this review article. © 2014 by the authors.

Zhang Q.,CAS Institute of Process Engineering | Yang C.,CAS Institute of Process Engineering | Yang C.,Jiangsu Marine Resources Development Research Institute | Mao Z.-S.,CAS Institute of Process Engineering | Mu J.,Wison Engineering Ltd.
Industrial and Engineering Chemistry Research | Year: 2012

Mixing time is a key parameter relevant to the scale-up and design of agitated reactors. Although there have been many published papers on mixing times in stirred tanks predicted by computational fluid dynamics (CFD), there are few reports on the large eddy simulation (LES) based prediction of the mixing time in a gas-liquid stirred tank. In this work, an LES method based on an Eulerian-Eulerian model is presented for predicting the mixing time in a gas-liquid stirred tank agitated by a Rushton turbine. In order to verify the simulated results, mixing time experiments were carried out using a conductivity technique. In the present LES, the Smagorinsky subgrid scale model was used to model the effect of subgrid scale on the resolved scales. The concentration distributions and operating parameters such as feed positions, impeller speeds, and gas flow rates on the mixing time were examined. It is shown that the predicted concentration distributions of tracers are more irregular and realistic by using LES. Also, the mixing time decreases with the increase of impeller speed. However, with increasing gas flow rate, the mixing time first increases and then levels off. The predicted mixing time by the LES method shows good agreement with the measured values. © 2012 American Chemical Society.

Wu S.,Huaihai Institute of Technology | Wang L.,Jiangsu Marine Resources Development Research Institute
Journal of Aquatic Food Product Technology | Year: 2016

Browning in the adductor muscle of bay scallop (Argopecten irradians) tends to occur during hot air drying due to polyphenoloxidase (PPO) and Maillard reaction and decreases the sensory quality and commercial value of bay scallop adductor muscles (BSAM). In the present study, the effects of glutathione on the browning inhibition of BSAM were evaluated. The PPO activity in BSAM was inhibited by 97.8 with 0.08% glutathione. The browning of BSAM pretreated with glutathione was evaluated during hot air drying. Compared with the control, BSAM pretreated with glutathione resulted in less drying time and browning during hot air drying. The results indicate that pretreatment with glutathione may be a promising method of BSAM browning inhibition during hot air drying. © 2016 Taylor & Francis

Shi D.H.,Huaihai Institute of Technology | Shi D.H.,JiangSu Marine Resources Development Research Institute | You Z.L.,Liaoning Normal University
Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya | Year: 2010

Two Schiff base zinc(II) complexes, [ZnBr2L1] • 2CH3OH (I) (I) and [ZnBr2L2] (II), where L 1 is 4-chloro-2-[(2-piperazin-1-ylethylimino)methyl]phenol and L 2 is 4-chloro-2-[(3-diethylaminopropylimino)methyl]phenol were synthesized and structurally characterized. The crystal of I is monoclinic: space group P21/c, a = 9.831(3), b = 18.680(6), c = 11.879(4) Å, β = 94.660(6)°, V = 2174.3(11) Å3, Z = 4. The crystal of II is monoclinic: space group P21/n, a = 7.2310(14), b = 16.037(3), c = 15.856(3), β = 90.01(3)°, V = 1838.7(6) Å3, Z = 4. The Zn atom in each complex is four-coordinated by one phenolate O and one imine N atoms of the Schiff base ligand and two bromide atoms, forming a tetrahedral coordination. The urease inhibitory activities of the complexes were evaluated. © 2010 Pleiades Publishing, Ltd.

Jiang L.,Jiangsu Marine Resources Development Research Institute | Jiang L.,Huaihai Institute of Technology
International Journal of Biological Macromolecules | Year: 2016

Glutathione has antioxidant activity, and citric acid exhibits acidity. Potassium sorbate displays antibacterial activity. Effects of pullulan-based coatings with 0.05% glutathione, 0.5% citric acid and 0.2% potassium sorbate on the preservation of razor clam Sinonovacula constricta meats (SCMs) during refrigerated storage (∼2 °C) were investigated. The glutathione-, citric acid- and potassium sorbate-incorporated pullulan-based coatings inhibited bacterial growth. Moreover, results showed reduced increase in pH, decreased total volatile basic nitrogen and enhanced overall acceptability score of SCMs during refrigerated storage (∼2 °C). These results indicated that treatment with pullulan-based coatings with glutathione, citric acid and potassium sorbate could prolong the shelf life of SCM for up to 10 days. © 2016

Cheng J.,CAS Institute of Process Engineering | Cheng J.,Jiangsu Marine Resources Development Research Institute | Yang C.,CAS Institute of Process Engineering | Yang C.,Jiangsu Marine Resources Development Research Institute | Mao Z.-S.,CAS Institute of Process Engineering
Chemical Engineering Science | Year: 2012

The continuous precipitation of BaSO4 with a premixed feed in a stirred tank is simulated. The population balance equation (PBE) is closed with the multi-class method. The effects of aggregation, feeding concentration, agitation speed, mean residence time, the crystal size distribution (CSD) at different locations and the net birth rate of each size bin due to aggregation are numerically studied. Size bin number tests show that at least 36 bins are needed for the size range in this work to achieve acceptable accuracy in both cases with and without aggregation. The predicted CSD is in good agreement with the reported experimental measurement. Narrower CSD and higher peak value are obtained with higher feed concentration. Aggregation broadens the CSD, decreases the peak value, and makes the CSD shift toward a larger size. The mean size L32 of crystals decreases significantly with increasing the inlet concentration, which is consistent with the experiments and model predictions reported in the literature. The effects of residence time and agitation speed on CSD and L32 are limited, which is very different from those in unpremixed cases. The CSD at the inlet region differs greatly from the outlet and near impeller regions, both in shape and value. A bimodal distribution appears around the inlet under some conditions. The net birth rate of the ith size bin due to aggregation increases dramatically with the inlet concentration. The detailed information, such as the bimodal distribution in a certain location under certain conditions and the aggregation rate of each size bin, could be useful for the precise and sophisticated control of precipitation in some novel processes like nano-particles production. © 2011 Elsevier Ltd.

Wang T.,CAS Institute of Process Engineering | Yu G.,CAS Institute of Process Engineering | Yong Y.,CAS Institute of Process Engineering | Yang C.,CAS Institute of Process Engineering | And 2 more authors.
Industrial and Engineering Chemistry Research | Year: 2010

Experiments are carried out in a baffled flat-bottom stirred tank to test five dual-impeller configurations, including a new type of impeller, alternate blade disk turbine (ABDT). Power consumptions in gas-liquid, liquid-solid, and gas-liquid-solid systems are determined by the shaft-torque method. It is found that the configuration with an axial impeller consumes less energy than that with a radial one in all multiple-phase systems. The correlations between power input and gas flow rate or solid concentration are also discussed. Power number reaches a limit with the increase of Reynolds number in liquid-solid systems. Aeration is proved to be harmful to solid suspension. Mixing time and solid particle concentration are measured by the electric conductivity method and Powder Voidmeter PC-6, respectively. The mixing modes (axial and radial) are proposed in the light of impeller types and flow patterns. The experimental results show that the mixing time of the double radial impeller configuration is the shortest, while the double axial impeller combination performs worst. Judging from the axial solid particle concentration distribution and overall suspension uniformity, the combination taking pitched blade turbine downflow (PBTD) as the lower impeller achieves the best solid suspension. © 2010 American Chemical Society.

Li X.,Chinese Academy of Sciences | Yang C.,Chinese Academy of Sciences | Yang C.,Jiangsu Marine Resources Development Research Institute | Zhang G.,Chinese Academy of Sciences | And 2 more authors.
Chemical Engineering and Technology | Year: 2011

A low-shear stirred vessel was explored. Experimental studies on the suspension of solid particles in solid-liquid and gas-solid-liquid systems were conducted to examine the performance of this new reactor. The method based on the power number curve was modified to determine the critical impeller speeds required for just complete off-bottom suspension of solids under non-gassed (N js) and gassed conditions (N jsg) in this reactor, and a PC-6A fiber-optic probe for the measurement of solid distribution was used to complementarily validate this method. A more homogeneous flow field was gained with a draft tube installed, so that the standard deviations of average shear rate and maximal shear rate are reduced. The modified power consumption method can determine N js and N jsg, and the values of N js with a draft tube are much lower than those without it. N jsg increases slightly with increasing gas flow rate, and N jsg with a higher solid weight fraction is larger in this lower-shear reactor. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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