Liang J.,Qinzhou University
Procedia Engineering | Year: 2011
For path planning problem of mobile robot in a known three-dimensional (3D) environment, proposed a path planning algorithm. Firstly, rasterize the known three-dimensional environment. Established the running costs estimate model for the grids from starting point to the target. Using the model to estimate the running costs for each grid. Then used A * search algorithm to calculate the grid path from starting to target with lowest running costs. By detectives of mobile robot, we planned an optimum path under the constraints of grids using hill climbing algorithm. Simulated results show that the algorithm can reduce the uphill or downhill times and running costs improve security, avoid the problem of local minimum. It is simple and robustness. © 2011 Published by Elsevier Ltd.
Li C.,South-Central University for Nationalities |
Wang Z.,Qinzhou University |
Zhan G.,South-Central University for Nationalities
Colloids and Surfaces B: Biointerfaces | Year: 2011
A gold/sodium dodecylbenzene sulfonate nanoparticles modified glassy carbon electrode (nano-Au/SDBS/GCE) was electrochemically fabricated with a constant potential at -0.4V. The obtained nano-Au/SDBS/GCE was characterized with scanning electronic microscopy, X-ray photoelectron spectroscopy and electrochemical techniques. Electrochemical behaviors of methyl parathion at the nano-Au/SDBS/GCE were thoroughly investigated. Compared to the unmodified electrode, the peak current obviously increased and the oxidation peak potential negatively shifted. These changes indicated that the composite nanoparticles possess good electrocatalytic performance on the electrochemical reaction of methyl parathion. Experimental parameters such as deposition time, pH value and accumulation conditions were optimized. Under optimum conditions, the peak current corresponding to the oxidation of the hydroxylamine group was found in a good linear relationship with the methyl parathion concentration. In addition, a calibration curve with excellent linearity was obtained in the concentration range from 5.0×10-7molL-1 to 1.0×10-4molL-1 with an estimated detection limit of 8.6×10-8molL-1 (S/N=3). The successful determination of methyl parathion in real samples demonstrated the usefulness and potential applications of this method. © 2010.
Li Q.,Qinzhou University
Proceedings of IEEE International Conference on Grey Systems and Intelligent Services, GSIS | Year: 2015
Prediction of the schedule of cruise ships benefits the managements of cruise ships. In order to prove the feasibility and accuracy of the grey GM (0, N) which is applied to cruise ships service, the number of monthly cruise ships which left Hong Kong for Macau from 2014 to 2105 are forecasted. The precision of the model is tested and analyzed by grey precision grades. Additionally, an interrelationship between cruise ships and external employee is analyzed by grey correlation degree to find out the impact factor of two variables. Its outcome shows that it is a scientific method to apply GM (0, N) to cruise ships because the grey predicted number closely matches the actual observed number and the convenience of cruise ships is one important factor in attracting talent in adjacent cities. This research provides a useful reference for the improvement of cruise ships' service by offering reasonable time arrangement of cruise ships and solving shortage of labor. © 2015 IEEE.
Che X.Y.,Qinzhou University
Applied Mechanics and Materials | Year: 2013
This paper firstly analyzes the information flow and logistics factors and establish an integrated information flow based on interface and general framework of logistics integration model, to build VMI & TPL mode integrated information flow and logistics system dynamics model. From logistics integrated subsystems, information flow integrated subsystems, coordination and control subsystem and risk analysis information flow and logistics subsystem integrated system architecture, and analyze various subsystems within the relationship between the various factors, we come to each subsystem causal diagram. Thus establishing an integrated information flow and logistics system model Article demonstrates the implementation of VMI supply chain model brings improvement in the overall economic effect, get a lot of useful conclusions with a wide range of uses. © (2013) Trans Tech Publications, Switzerland.
Xu S.-Q.,Qinzhou University
Acta Crystallographica Section E: Structure Reports Online | Year: 2012
In the title compound, C14H12N4O 3, the dihedral angle between the benzene rings is 7.6 (4)°. In the crystal, infinite sheets linked by N - H⋯O and bifurcated N - H⋯(O,N) hydrogen bonds propagate in the (10-1) plane, in which R 4 4(36) loops are apparent. Neighbouring layers may inter-act by way of very weak π-π stacking inter-actions [centroid-centroid distances = 3.9329 (13) and 4.0702 (13) Å]. © Shu-Qing Xu 2012.
Hu X.,Qinzhou University |
Wang Y.,Qinzhou University |
Peng B.,University Utrecht
Chemistry - An Asian Journal | Year: 2014
Herein, we present a straightforward synthesis of pH-responsive chitosan-capped mesoporous silica nanoparticles (MSNs). These MCM-41-type MSNs could be used as nanocapsules to accommodate guest molecules. Subsequently, (3-glycidyloxypropyl)trimethoxysilane was grafted onto the surface of the MSNs, which served as a bridge to link between MSNs and chitosan, which is ubiquitous in nature and commercially available. Owing to the pH-responsive and biocompatible features of chitosan, the loading and release of an anti-cancer drug, doxorubicin hydrochloride, were carried out in vitro, in which the composite chitosan-capped MSNs (CS-MSNs) showed excellent environmental response. As the pH value of the media decreased, the degree of drug release correspondingly increased. Moreover, thanks to the perfect biocompatibility of chitosan, the CS-MSNs exhibited lower cytotoxicity than that of the naked MSNs in an MTT assay. In addition, the in vitro kill potency against MCF-7 breast-cancer cells was enhanced over time, as well as with increasing concentration of the drug-loaded CS-MSNs. These results indicate that CS-MSNs are promising candidates for pH-responsive drug delivery in cancer therapy. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Zhang C.-X.,Qinzhou University |
Dai Z.-R.,Qinzhou University
Food and Chemical Toxicology | Year: 2011
A water-soluble polysaccharide, named as SNP, was extracted and fractioned from the body wall of Sipunculus nudus L. by DEAE-Sepharose anion exchange and Sepharose CL-6B column chromatography. The structural characteristics of SNP investigated by high performance size exclusion chromatography (HP-SEC), Fourier transform infrared spectroscopy (FT-IR) and gas chromatography-mass spectrometry (GC-MS) indicated that SNP was a homogeneous polysaccharide with a molecular mass of 350. kD and the monosaccharide composition was determined to be rhamnose (28%), fucose (16%) and galactose (56%). SNP was able to upregulate the expression of cytokines (IL-6 and TNF-α), but did not affect IL-10 secretion by murine macrophages and human peripheral blood mononuclear cells. RT-PCR analysis demonstrated that the SNP also induced the expression of iNOS and COX-2, responsible for the induction of NO and PGE2 respectively, and SNP suppressed the arginase activity. These results suggest that the polysaccharide isolated from S. nudus activates macrophages and has potent immunostimulating activity. © 2011.
Si J.,Qinzhou University
Engineering Technology, Engineering Education and Engineering Management - International Conference on Engineering Technology, Engineering Education and Engineering Management, ETEEEM 2014 | Year: 2015
Translation is not only a language activity but also a thinking activity that involves the conversion of the two languages, and language is both a thinking tool and the result of thinking. Language and thought are closely related, and they are both interacting and interdependent. Different thinking determines that the expression of both English and Chinese on the same topic is also different. Through the relationship between language and thought, standing on a higher philosophical point of thinking, we can investigate the effect of the differences between English and Chinese translation. The translator can pay more attention to the impact of difference on translation, which assures a higher accuracy of the translation. © 2015 Taylor & Francis Group, London.
Zhang C.-X.,Qinzhou University |
Dai Z.-R.,Qinzhou University
International Journal of Biological Macromolecules | Year: 2011
A water-soluble polysaccharide, named as SNP, was extracted and fractioned from the body wall of Sipunculus nudus L. by DEAE-Sepharose anion exchange and Sepharose CL-6B column chromatography. The evaluation for anti-hypoxia activity demonstrated that SNP had significant anti-hypoxic activity on normobarie hypoxia, chemical intoxicant hypoxia and acute cerebral ischemia hypoxia models in mice. SNP also enhanced the number of red blood cell count (RBC) and the concentration of hemoglobin (HGB). The structural characteristics of SNP investigated by high performance size exclusion chromatography, Fourier transform infrared spectroscopy and gas chromatography-mass spectrometry indicated that SNP was a homogeneous polysaccharide with a molecular mass of 350. kD and was composed of rhamnose (28%), fucose (16%) and galactose (56%). The results suggested that SNP could be explored as a novel potential anti-hypoxia agent. © 2011 Elsevier B.V.
Zhang H.Y.,Qinzhou University
Advanced Materials Research | Year: 2014
The interfacial tension (IFT) and contact angles of different oil/solutions were compared to unveil the influence of Mg2+ on oil/NaOH interfacial properties. The results demonstrate that adding Mg2+ to NaOH solution cannot change the oil/NaOH interfacial tension when enough OH- is provided. While for NaOH-surfactant solution, adding Mg2+ changes the IFT dramatically. Adding NaOH to oil/water produces a minimal contact angle at NaOH of 0.02wt%. Adding surfactant or MgCl2 alone increases the contact angles. Adding them together produces a synergism to bringing down contact angles gradually with the increase of NaOH concentration. The change of salinity and the reaction among them may be responsible for the influence and synergism. © (2014) Trans Tech Publications, Switzerland.