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Hangzhou, China

Li G.,Ocean University of China | Chen S.,Zhejing University | Wang Y.,Ocean University of China | Xue Y.,Ocean University of China | And 4 more authors.
International Journal of Biological Macromolecules | Year: 2011

A novel glycosaminoglycan-like sulfated polysaccharide (AAP) from the pleopods of Haliotis discus hannai Ino was purified by DEAE ion exchange chromatography followed with S-300 HR geltrion chromatography. Chemical composition analysis indicated that AAP was composed of galactosamine, glucuronic acid, fucose, galactose with a ratio of 2.14:2.37:2.94:1, the content of sulfate was 15.5%. The average molecular weight (M w) was 56.2kDa in a TSK G4000 column. Further IR, 1D, 2D NMR spectroscopic analysis of the correlation signals of different sugar units gave a proposal repeating structure, as follows:In vitro anticoagulant assay indicated AAP prolonged both the activated partial thromboplastin time (APTT) and thrombin time (TT), with a 22.5. U/mg and 72.0. U/mg compared with standard heparin, respectively. The anticoagulant property of AAP was mainly attributed to powerful potentiation thrombin by anti-thrombin III. © 2011 Elsevier B.V. Source

Liu W.B.,Zhejing University
Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences | Year: 2011

To investigate the variability of event-related potentials P(300) and the relationship with memory function/psychopathology in patients with first-episode paranoid schizophrenia. Thirty patients with first-episode paranoid schizophrenia (patient group) and twenty health subjects (control group) were enrolled in the study. The auditory event-related potentials P 300 at the scalp electrodes Cz, Pz and Wechsler Memory Scale (WMS) were examined in both groups, Positive And Negative Syndrome Scale (PANSS) was evaluated in patient group. In comparison with control group, patients had longer latency of P 300 [(390.6 ± 47.6)ms at Cz and (393.3 ± 50.1)ms at Pz] (P<0.01), lower amplitude of P 300 [(7.7 ± 3.4) μV at Cz and (8.5 ± 3.9)μV at Pz] (P<0.05-0.01). The memory quotient (88.1 ± 10.0) scores and short-term memory, immediate memory in patient group were damaged significantly (P<0.05-0.01). In patient group, the latency of P300 was correlated positively with PANSS scores and negatively with WMS scores (P<0.05-0.01). First-episode paranoid schizophrenia has memory deficit, which can be evaluated comprehensively by P 300 and WMS. The longer latency of P 300 might be associated with the increased severity of first-episode paranoid schizophrenia. Source

Bai Z.,Zhejing University | Ruan X.,Huazhong University of Science and Technology | Xu L.,Huazhong University of Science and Technology
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | Year: 2011

Grid-connected inverter system with LCL filter is a third-ordersystem, which has a gain peak at its resonant frequency, and hence lower stability margin and involved complicated design of current regulators. In order to solve these problems, this paper proposes a novel control strategy with the combination of the grid (or inverter side) current feedback and another state variable feedforward, which can degrade the system order from the third to the first. Therefore, not only the stability margin is enlarged, but also the gain peak is eliminated and the current regulator design is greatly simplified. Besides, additional controls are also developed to attenuate the effects of grid voltage distortion or local load disturbance on the grid current, and the grid current waveforms can be further improved. Theoretical analysis, simulation and experimental results verified the proposition. Source

Yonggang L.,Jiaxing University | Yonggang L.,Polytechnic University of Mozambique | Haiming Y.,Jiaxing University | Haiming Y.,Zhejing University
International Review on Computers and Software | Year: 2013

A specific erotic image detection method (SEIDM) is presented for some special kinds of erotic images which are difficult to be identified by conventional algorithm in this paper. According to the features of these specific erotic images, an improved skin-color model is presented and a new image text detection method using integral image is designed. Text information and skin-color information detected are fed to a trained Support Vector Machine (SVM) which gives the final result. The experimental results indicate that SEIDM can detect special erotic image with high recall and precision. © 2013 Praise Worthy Prize S.r.l. - All rights reserved. Source

Chiu C.F.,Hohai University | Chiu C.F.,Zhejing University | Ni X.W.,Hohai University | Zhang L.S.,Hohai University
Engineering Geology | Year: 2014

A vadose zone may exist within man-made or natural slopes under the condition of a deep water table. During repeated cyclic infiltration (wetting) and evaporation (drying), the suction and degree of saturation may change within this regime. Thus, it is crucial to have a thorough understanding of the effects of a cycle of wetting and drying on the shear strength of unsaturated soils to assess the long term stability of these slopes. Three series of laboratory tests are presented in this paper, from which the water retention and shear behaviors of an unsaturated clay are studied. A three-dimensional main wetting surface is proposed and a unique failure envelope expressed in terms of Bishop's stress can be used to characterize the shear strength of unsaturated soil subjected to different hydraulic histories. The measured shear strengths are compared with those predicted by the proposed main wetting surface and the drying curve under no confining stress. It is found that a better prediction is obtained by using the main wetting surface for unsaturated specimens subjected to different hydraulic histories. © 2014 Elsevier B.V. Source

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