Time filter

Source Type

Heihe, China

Liu C.,Heihe College | Zhang Z.,Harbin Engineering University | Xie X.,Harbin Engineering University
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2013

At present, all the dominant retrieval systems utilize the relevance as a method of ranking the return results. However, the results of retrieval systems were found to be isolated and lacked integrity. Meanwhile, if the query information was found to be obscured and involved many subjects, the redundancy produced very large numbers, especially for the top ranking results. To obtain complete information, we tried to use the document set generation algorithm to assemble the relevant retrieval results based on a subtopic extraction method, and proposed a new concept called "inclusion". Finally, we combined the measures "relevance", "inclusion" and "novelty" to re-rank the initial document sets. The experimental results show that the overall relevance increased after improving the algorithm, and also, the top of the document collection had greater inclusion degree and novelty degree. The included information was more complete with smaller redundancies, which fulfill the user's query request with a better query satisfaction. Source

Liu L.-H.,Ningxia University | Liu L.-H.,Heihe College | Duan C.-Q.,Ningxia University | Duan C.-Q.,Ningxia Medical University | Gao Z.-N.,Ningxia University
Journal of the Serbian Chemical Society | Year: 2012

The electrochemical behavior and electrochemical determination of carbamazepine (CBZ) at a hydrophobic ionic liquid 1-benzyl-3-methylimidazole hexafluorophosphate ([BnMIM]PF 6) modified carbon paste electrode ([BnMIM]PF 6/CPE) in the presence of sodium dodecyl sulfate (SDS) were investigated. A well-defined and sensitive oxidation peak was observed at the [BnMIM]PF 6/CPE in the presence of SDS and a 0.10 M phosphate buffer solution (pH 6.80). The oxidation peak current of CBZ increased significantly at the [BnMIM]PF 6/CPE in the presence of SDS compared with that in the absence of SDS at the carbon paste electrode. It suggested that both SDS and [BnMIM]PF 6/CPE show an obvious enhancing effect on the electrochemical oxidation of CBZ. The electrochemical kinetic parameters for CBZ at the [BnMIM]PF 6/CPE in aqueous SDS solutions were also determined by chronocoulometry and chronoamperometry. Finally, the experimental conditions were optimized, and a new electrochemical method for the determination for CBZ was established. The oxidation peak current was linearly dependent on the CBZ concentration in the range 7.0 μM to 0.7 mM, with a detection limit of 0.98 μM (signal to noise ratio, S/N = 3). The relative standard deviation for six determinations of 0.10 mM CBZ was between 1.40 and 2.13 %. The proposed method was applied in the determination of CBZ in commercial tablet samples. © 2012 Copyright (CC) SCS. Source

Qi S.,Heihe College
Applied Mechanics and Materials | Year: 2014

This paper discusses the form of inequality Cauchy-Schwarz in the field of calculus, giving the different methods of proof, which includes Parameter method, variable upper limit integral function method, the double integral and definite integral definition method. What’s more, through a series of examples, it also reflects that the inequality Cauchy-Schwarz can make the process of proving the inequality more simple while certifying the Integral inequality. © (2014) Trans Tech Publications, Switzerland. Source

Li B.,Harbin Normal University | Li B.,Heihe College | Yu K.,Harbin Normal University | Wang C.,Harbin Normal University | And 2 more authors.
Journal of Inorganic and Organometallic Polymers and Materials | Year: 2014

An unusual tetrazole-based Cd(II) coordination polymer, [Cd(4-tzba)(H2O)]n (tzba = 4-(tetrazolyl)benzenecarboxylic acid) (1), was synthesized by hydrothermal reaction and structurally characterized by single-crystal X-ray diffraction. The structure of 1 contains distorted octahedral cadmium centers coordinated by four different tzba2- ligands and a water molecule. All the tzba2- ligands display coordination of type, μ4-κN1:κN3:κN4:κO1, O2, which connects four Cd(II) atoms to form an intricate 3-D network. There are three kinds of apertures in the structure of 1; two helical channels and a hexagonal aperture are observed along different axes. Polymer 1 exhibits selective gas adsorption behavior for methanol, ethanol and water. In addition, 1 shows blue photoluminescence mainly arising from intraligand transitions of the aromatic rings in the tbza2- ligand. © 2013 Springer Science+Business Media New York. Source

Zhang D.,Heihe College
Journal of Theoretical and Applied Information Technology | Year: 2013

P.E. teaching evaluation system is an important mean and method to measure the general proficiency of P.E. teachers teaching profession. Traditional evaluation method is highly influenced by subjective factors and is not able to reflect teachers' practical level factually. This study builds a P.E. teaching evaluation model based on analytic hierarchy process. The results show that the weight of teaching effect, teaching method and teaching attitude are 0.21, 0.20 and 0.20 accordingly, and these three factors have the greatest impact on the result of P.E. teaching evaluation while teaching content and scientific research have a less impact (the weights are 0.12 and 0.10). It is verified through an example that the P.E. teaching evaluation result based on analytic hierarchy process is reasonable and in accordance with P.E. teaching laws. In conclusion, it is suggested that this evaluation model can be popularized and applied in P.E. teaching evaluation. © 2005 - 2013 JATIT & LLS. All rights reserved. Source

Discover hidden collaborations