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Qiu L.,Guangdong Food and Drug Vocational College | Hu F.,South China University of Technology | Peng Y.,South China University of Technology
Carbohydrate Polymers | Year: 2013

Structure of dual modified starches, cross-linked esterified corn starch (CES) and esterified cross-linked corn starch (ECS), and product films (CEF and ECF) were characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction and scanning electron microscopy (SEM). The peak 1730 cm -1 of IR spectra confirmed the formation of ester carbonyl groups in starch matrix. The sequence of modification procedure had an impact on the final modification degree, resulting in structural differences of modified starches and starch films. Compared to native starch film (NF), CEF and ECF showed improved transparence (77.59% and 74.39% respectively) with compact structure, lower crystallinity (6.5% and 7.4% respectively). Results of mechanical test indicated that structure of ECF was more flexible than CEF, whereas tensile strength was higher in CEF. Accordingly, complex modification could be an effective method to adequate properties of starch films for specific processing requirements. © 2012 Elsevier Ltd. Source


Duan Q.,Guangdong Food and Drug Vocational College | Cao J.,Hangzhou Normal University | Zhang J.,Anhui University of Traditional Chinese Medicine
Analytical Methods | Year: 2012

In this study, a capillary electrophoresis-mass spectrometry (CE-MS) method with field-amplified sample stacking was developed to analyze and detect four hydrophilic active components (danshensu, salvianolic acid B, caffeic acid and lithospermic acid) present in many plant-derived samples, and to evaluate their antioxidant ability. The assay was performed on an uncoated fused-silica capillary of 95 cm × 50 μm I.D. and a positive voltage of 27 kV was applied. The sample was injected under pressure of 50 mbar for 3-300 s and the temperature of capillary was kept 25°C. Sheath liquid constituted of 5 mM ammonium acetate in methanol solution, flowing at 4 μL min -1, and was supplied to the CE-electrospray interface. The effects of nebulizer gas pressure, the flow rate and temperature of the drying gas, sheath liquid composition and flow rate, and sample injection length were optimized in order to obtain better performance. Utilizing the preconcentration technique, the sensitivity was enhanced by approximately 30-50 fold in terms of limits of detection compared to common hydrodynamic injection without interference from matrix coextractives. The phenolic antioxidant abilities were also determined by simple and accurate free radical spiking test. Furthermore, the method has been successfully applied to a danshen sample. This journal is © The Royal Society of Chemistry 2012. Source


Liu N.,University of Jinan | Wu J.,Guangdong Food and Drug Vocational College
Sensors and Transducers | Year: 2014

Serial robots and parallel robots have their own pros and cons. While hybrid robots consisting of both of them are possible and expected to retain their merits and minimize the disadvantages. The Delta-RST presented here is such a hybrid robot built up by integrating a 3-DoFs traditional Delta parallel structure and a 3-DoFs RST robotic wrist. In this paper, we focus on its kinematics analysis and its applications in industry. Firstly, the robotic system of the Delta-RST will be described briefly. Then the complete and systemic kinematics of this kind of robot will be presented in detail, followed by simulations and applications to demonstrate the correctness of the analysis, as well as the effectiveness of the developed robotic system. The closed-form kinematic analysis results are universal for similar hybrid robots constructing with the Delta parallel mechanism and serial chains. © 2014 IFSA Publishing, S. L. Source


Zhang Y.-P.,Guangdong Food and Drug Vocational College | Li C.-M.,South China University of Technology
Electronics Letters | Year: 2015

The design of a small printed slot antenna for ultra-wideband application is presented. The antenna is simply formed by an L-shaped slot embedded at the centre of the ground plane, a 50 ω microstripfed line, a rectangular slit connected with the L-shaped slot and another rectangular slit at the bottom of the ground plane. The antenna has small dimensions of 16 × 28 × 0.8 mm3. The impedance bandwidth with 10 dB return loss of the antenna is from 3.1 to 10.6 GHz, in which there is two rejected bands which cover 3.3-3.73 and 5.15-5.9 GHz. © 2015 The Institution of Engineering and Technology. Source


Tan X.,Guangdong Food and Drug Vocational College
MATEC Web of Conferences | Year: 2015

In order to meet the need of modern medical electronic instrument measurement and control experiment, this paper put forward a design scheme of medical electronic instrument measurement and control system based on virtual instrument technology. The system combined with virtual instrument, data acquisition and network technology, the optimization of the level of automation control of medical electronic instrument, and realizes the function of remote control, and provide good interactive interface. Through the system design makes the medical electronic instrument simulation measurement and control experiment with high utilization rate of equipment, a good share of the equipment, and the advantages of good scalability. © 2015 Owned by the authors, published by EDP Sciences. Source

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