Li Y.-M.,Shangqiu Normal College |
Mei F.-X.,Beijing Institute of Technology
Wuli Xuebao/Acta Physica Sinica | Year: 2010
The generalized canonical transformations of a kind of generalized Birkhoff systems are studied in this paper. The differential equations of motion of the generalized Birkhoff systems are estallished. The condition under which the transformations of the system are canonical is obtained. An example is given to illustrate the application of the result. © 2010 Chin. Phys. Soc.
Xu Q.S.,Nanjing Normal University |
Hu J.Z.,Shangqiu Normal College |
Xie K.B.,Nanjing Normal University |
Yang H.Y.,Nanjing Normal University |
And 2 more authors.
Journal of Hazardous Materials | Year: 2010
In the present study, Potamogeton crispus L. plants exposed to various concentrations of silver (Ag) (5, 10, 15, and 20 μM) for 5 d were investigated to determine the accumulating potential of Ag and its influence on nutrient elements, chlorophyll pigments and fluorescence, various antioxidant enzymes and compounds, adenosine triphosphate (ATP), protein content and ultrastructure. The accumulation of Ag was found to increase in a concentration dependent manner with a maximum of 29.3 μg g-1 at 20 μM. The nutrient elements (except Ca), photosynthetic pigments, chlorophyll a fluorescence parameters (Fo, Fv, Fv/Fm, Fv/Fo), malondialdehyde (MDA), ATP, peroxidase (POD) activity, ascorbate (AsA), reduced glutathione (GSH) and protein contents decreased significantly as concentration of Ag augmented. In contrast, an induction in SOD activity was recorded, while an initial rise in Ca content and CAT activity was followed by subsequent decline. Morphological symptoms of senescence phenomena such as chlorosis and damage of chloroplasts and mitochondria were observed even at the lowest concentration of Ag, which suggested that Ag hastened the senescence of the tested plants. The loss of nutrients and chlorophyll content and damage of chloroplasts were associated with disturbances in photosynthetic capacity as indicated by the quenching of chlorophyll a fluorescence. Decreased chlorophyll and protein contents suggest oxidative stress induced by Ag. In addition, both the reduction of ATP and the damage to the ultrastructure of organelles were indicative of general disarray in the cellular functions exerted by Ag. Crown Copyright © 2009.
Li M.,Shangqiu Normal College
Chinese Journal of Tissue Engineering Research | Year: 2013
Background: Researches indicate nitric oxide plays a crucial role in tendon healing. Objective: To summarize the progress of recent researches on the nitric oxide and tendon healing. Methods: A computer-based online search of related papers from January 1992 to December 2011 was performed in PubMed database using the key words "nitric oxide, tendon, healing" in English, and in CNKI database using the key words of "nitric oxide, tendon, healing" in Chinese from January 1995 to December 2011. Totally 115 articles were found, and finally 37 articles were included in result analysis. RESULTS ADN CONCLUSION: In normal tendons, there is no expression of nitric oxide synthase; however, in injured tendons, there is a significant increase in nitric oxide synthase activity at different time. When this activity is inhibited, tendon healing is impaired. When nitric oxide, in the correct doses, is added, tendon healing is enhanced. Nitric oxide may play a role in controlling inflammation and extracellular matrix metabolism, which improves the symptoms, signs, quality and function of the tendon.
Liu Q.F.,Shangqiu Normal College
Advanced Materials Research | Year: 2014
Bench and pilot scale pre-oxidation treatment runs were performed on the raw water samples from micro-polluted reservoir. Bench experimental results showed that the particles with large size decreased when ozone pre-oxidation was applied, meanwhile, the organic matters with unsaturated chemical bonds decreased obviously. Pilot experimental results showed that turbidity, UV254, CODMn and total coliform could be treated efficiently by ozone pre-oxidation combined with traditional technologies, but the effectiveness of DOC removal is not obvious. © (2014) Trans Tech Publications, Switzerland.
Fang H.-B.,Shangqiu Normal College
Proceedings - 2nd International Conference on Information Technology and Computer Science, ITCS 2010 | Year: 2010
Constructing the structure of BN through qualitative approachability is feasible according to fusion. In this paper, a new concept, generalized causal qualitative networks, is put forward as well as its fusion model is given for qualitative modeling of corresponding Bayesian networks through qualitative approachability. © 2010 IEEE.
Liu Q.F.,Shangqiu Normal College
Advanced Materials Research | Year: 2014
In the synthesis of 2-ethoxycarbonyl-3, 4-diethyl-pyrrole (1) by the Barton-Zard reaction of 4-acetoxy-3-nitrohexane (1b) with ethyl isocyanoacetate, the organic base 1, 8-diazabicyclo [5.4.0] undec-7-ene (DBU) and the solvent tetrahydrofuran (THF) were replaced with K2CO3 and ethanol, respectively. Moreover, the preparation of the intermediate 1b from 1a by acetylation reaction was carried out by employing acetyl chloride in boiling toluene solution instead of acetic anhydride and the catalyst concentrated sulfuric acid. After treatment of 1 with excess LiAlH4 at low temperature, the crude product 1c (α-hydroxymethyl-3, 4-diethyl-pyrrole) was immediately reacted via a tetramerization in the presence of the catalyst BF3.OEt2 in crude CHCl3, followed by oxidation of 2, 3-dichloro-5, 6-dicyano-1, 4-benzoquinone (DDQ) to provide the corresponding octaethylporphyrin 2. The results indicate that using BF3.OEt2 as catalyst instead of p-toluenesulphonic acid (p-TsOH) in the synthesis of 2 from 1c can obviously increase the yield of product 2 up to 80% from 69%. © (2014) Trans Tech Publications, Switzerland.
Han X.-Q.,Shangqiu Normal College
Wuli Xuebao/Acta Physica Sinica | Year: 2014
The ab initio configuration interaction method and coupled-cluster theory have been used to optimize the possible ground-state structures of SiF2. The method QCISD/6-311G(2df) is most suitable for the calculation of SiF2 by comparing the experimental value and the calculated value; and the calculated equilibrium structure, harmonic frequency, dissociation energy, force-constant are in good agreement with the experimental data. The potential energy functions of SiF2 have been derived from the many-body expansion theory. In the symmetry of stretching vibration and rotation potential energy diagram of SiF2, there is a saddle point in the reaction kinetics SiF+F→SiF2. A stable SiF2 molecule could be formed when F atom with an energy surpassing 4.38 eV. These are completely reported so far as we know for the first time. In addition, it is found that a stable SiF2 molecule could be formed through two equivalent channels of SiF+F→SiF2. And the reaction is endothermic with a threshold energy. © 2014 Chinese Physical Society.
Zhou K.,Shangqiu Normal College
Energy Procedia | Year: 2011
The economic evaluation of reservoir tourism is an important basis for the development of Haibo Bay reservoir. The premise of the economic evaluation of reservoir tourism is to forecast the number of tourists. It is a more feasible idea to adopt the analogy forecast in the absence of preliminary source data. On the basis of the predicted source, the scientific evaluation of tourism economic benefits can be measured by calculating the payback period and the benefit ratio of this reservoir. © 2011 Published by Elsevier Ltd.
Hu G.,Shangqiu Normal College
ICIME 2010 - 2010 2nd IEEE International Conference on Information Management and Engineering | Year: 2010
Applying sparse algorithm can improve the prediction speed of support vector regression effectively. This paper solves sparse support vector regression with piecewise loss function based on iterative reweight method. By reducing support vector number, the length of regression function expansion and the prediction time of regression function for new samples are decreased. Comparing with sparse LS-SVR, the method has the advantages of suiting different noise data steady prediction performance and good generalization performance. © 2010 IEEE.
Qifeng L.,Shangqiu Normal College
Proceedings of the 2013 3rd International Conference on Intelligent System Design and Engineering Applications, ISDEA 2013 | Year: 2013
Analyzing the characteristic of the organics in the Miyun reservoir and researching the organics in raw water with physical and chemical classification. On physical classification, the content of micromolecule organics in it is higher than that of other one. On chemical classification, the predominant organics in it is hydrophilic. The semi-works production research indicates that compare with the common technology, the ozone oxidation technology can increase the UV254 removing ratio in water, but have some side effect while removing dissolved organics. © 2012 IEEE.