Wu J.,Guangdong Food and Drug Vocational College |
Zhang H.,University of Alberta |
Guan Y.,Guangdong University of Technology
Proceedings - IEEE International Conference on Robotics and Automation | Year: 2014
An important problem in robot simultaneous localization and mapping (SLAM) is loop closure detection. Recent studies of the problem have led to successful development of methods that are based on images captured by the robot. These methods tackle the issue of efficiency through data structures such as indexing and hierarchical (tree) organization of the image data that represent the robot map. In this paper, we offer an alternative approach and present a novel method for visual loop-closure detection. Our approach uses an extremely simple image representation, namely, a down-sampled binarized version of the original image, combined with a highly efficient image similarity measure - mutual information. As a result, our method is able to perform loop closure detection in a map with 20 million key locations in about 2.38 seconds on a commodity computer. The excellent performance of our method in terms of its low complexity and accuracy in experiments establishes it as a promising solution to loop closure detection in large-scale robot maps. © 2014 IEEE.
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.
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.
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.
Chen Q.,Guangdong Food and Drug Vocational College |
Wang E.,Guangdong Food and Drug Vocational College |
Ma L.,Guangdong Food and Drug Vocational College |
Zhai P.,Guangdong Food and Drug Vocational College
Lipids in Health and Disease | Year: 2012
Background: Resveratrol (RSV), a naturally occurring polyphenolic stilbenoid, is known to possess potent antiatherogenic properties; however, the effect of RSV on hypercholesterolemia is not fully understood. We hypothesized that RSV decreases blood cholesterol levels through the activation of cholesterol 7α-hydroxylase (CYP7A1)-mediated bile acid synthetic pathway pathways in vitro and in vivo. Methods: In this study, we evaluated body weight, serum lipid concentrations, hepatic lipid content and the size of the bile acid pool in high-fat diet (HFD)-fed C57BL/6 J mice that were treated with RSV. In addition, we characterized the underlying mechanism of the effects of RSV in HepG2 hepatocytes by Western blot analysis. Results: RSV (200 mg/kg per day) reduced body weight and liver weight gains, improved serum lipid parameters, reduced hepatic cholesterol accumulation and increased the bile acid pool size in mice fed an HFD for 8 wks. RSV significantly increased liver expression of CYP7A1 mRNA and protein and CYP7A1 enzyme activity. Furthermore, RSV treatment upregulated CYP7A1 expression and induced liver X receptor alpha (LXRα) activation in a time- and dose-dependent manner in HepG2 cells. In addition, the specific liver X receptor alpha (LXRα) inhibitor geranylgeranyl pyrophosphate (GGPP) inhibited the RSV-induced expression of CYP7A1 in HepG2 hepatocytes. Conclusion: The beneficial effects of RSV on HFD-induced hypercholesterolemia are mediated through LXRα signaling pathways, suggesting a potential target for the prevention of dyslipidemia. © 2012 Chen et al.; licensee BioMed Central Ltd.
Jiang Y.N.,Guangdong Food and Drug Vocational College
Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials | Year: 2010
To study the formulation optimization of epimedium flavonoids self-emulsifying drug delivery system and evaluate its effect in vitro and in vivo. Based on the degree of emulsification and emulsifying time, the formulation optimization (i.e., screening of suitable oil phases, nonionic surfactants and co-surfactants) was made by the use of determination of the solubility, orthogonal design and construction of tertiary phase diagram. The dissolution of SEDDS was measured and its pharmacokinetic in rats was measured. The experimental results revealed the optimized formulation of the self-emulsifying drug delivery system which consisted of oleic acid as oil phase, Tween-80 as nonionic surfactant, and PEG400 as co-surfactant in the proportion of 2:4:4. The dissolution of SEDDS in water was more than 85% in 25 minutes, while that of the epimedium flavonoids capsule was less than 50% in 60 minutes. Application of the optimized formulation of epimedium flavonoids self-emulsifying drug delivery system could significantly increase the solubility of epimedium flavonoids in water and improve its bioavailability.
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.
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.
Zhang J.H.,Guangdong Food and Drug Vocational College
Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials | Year: 2010
To study the preparation technique of total lactone of Ginkgo controlled release pellet. Aquacoat as controlled release material, DBS as plasticizer, HPMC as diffusion promoter, the best manufacture technique was got according to the factors affecting the release of the pellet. The controlled release pellet had good release rate and achieved the aim of controlling release. The technique could be used for industrialization production.
Yang Y.J.,Guangdong Food and Drug Vocational College
Nan fang yi ke da xue xue bao = Journal of Southern Medical University | Year: 2010
To establish a high-performance liquid chromatography (HPLC)-based method for determining the contents of psoralene, bergapten and apigenin in Ficus hirta Vahl. A Hypersil C18 column (250 mm × 4.6 mm, 5 μm) was used with the mobile phase of methanol-water (60:40), flow rate of 1.0 ml/min, detection wavelength of 268.7 nm and column temperature of 30 degrees celsius. The calibration curve was linear within the range of 10.0-30.0 μg/ml for psoralene (r=0.9998), 15.0-45.0 μg/ml for bergapten (r=0.9998) and 5.0-15.0 μg/ml for apigenin (r=0.9992). The average recovery of psoralene was 99.7% (RSD=1.99%), that of bergapten was 99.9% (RSD=1.71%) and that of apigenin was 100.3% (RSD=1.78%). The method is simple, economic and accurate with good reproducibility for the contents of psoralene, bergapten and apigenin.