Mudanjiang, China
Mudanjiang, China

Time filter

Source Type

Shi F.-G.,Beijing Institute of Technology | Wang L.,Mudanjiang Teachers College
Journal of Intelligent and Fuzzy Systems | Year: 2013

In this paper, our aim is to present properties and characterizations of M-fuzzifying matroids. Firstly, we study some properties ofM-fuzzifying rank functions. Then we introduce the concepts ofM-fuzzy families of dependent sets andM-fuzzifying closure operators by which we can characterize M-fuzzifying matroids. Finally we give applications of fuzzifying matroids in combinatorial optimization. © 2009 - IOS Press and the authors.


Meng X.-X.,Mudanjiang Teachers College | Tian S.-G.,Mudanjiang Medical University
19th International Conference on Industrial Engineering and Engineering Management: Engineering Management | Year: 2013

In the reason of the deficiencies in their own areas, traditional costing methods cannot accurately measure the cost of logistics. It urgently asks us to find new methods to measure logistics cost accurately and effectively. The application of activity-based costing to logistics management is keeping with this request. The principles of activity-based costing are expounded firstly, then this text intends to identify that activity-based costing have also its applicability in the logistics cost management in comparison with traditional costing. Finally two methods are compared and result of testing is analyzed. This text is focused on the application of activity-based costing to calculate logistics cost, which solves the problem of how to combine activity-based cost with practice. © 2013 Springer-Verlag Berlin Heidelberg.


Yin Y.,Mudanjiang Teachers College
Acta Crystallographica Section E: Structure Reports Online | Year: 2010

The title compound, C 6H 14N 2O, was synthesized by the reaction between 2-amino-2,3-dimethyl-butanonitrile and oil of vitriol (sulfuric acid). A racemic mixture of L- and R-2-amino-2,3-di-methyl- butanamide was characterized crystallographically. In the crystal structure, inter-molecular N - H⋯O hydrogen bonds link the two enanti-omers into a three-dimensional network.


Wang L.,Beijing Institute of Technology | Wang L.,Mudanjiang Teachers college | Shi F.G.,Beijing Institute of Technology
Iranian Journal of Fuzzy Systems | Year: 2010

An L-fuzzifying matroid is a pair (E,I), where I is a map from 2E to L satisfying three axioms. In this paper, the notion of closure operators in matroid theory is generalized to an L-fuzzy setting and called L-fuzzifying closure operators. It is proved that there exists a one-to-one correspondence between L-fuzzifying matroids and their L-fuzzifying closure operators.


Xu H.,Mudanjiang Teachers College
Proceedings - 2010 IEEE International Conference on Intelligent Computing and Intelligent Systems, ICIS 2010 | Year: 2010

In this paper, we further analyze and prove the stability and convergence of the proposed dynamic system. We get that this network is complete stable, which can be used to solve an associated constrained convex optimization problem. Meanwhile, in order to show the wider domain of the method for stability used in this paper, we propose another neural network to solve a class of degenerate quadratic program. This network has a simpler structure than the other networks used to solve this class of problem. Furthermore, by introducing two new Lyapunov functions, we get that, for any initial points, all the obtained results in this paper remain valid, which improve the existing ones. Particularly, we also get some finite time convergence and exponential convergence results. Simulation examples show the correctness of the results in this paper and the effectiveness of the proposed neural networks to solve the two classes of optimization problems. ©2010 IEEE.


Li J.,Harbin Normal University | Sun W.-J.,Harbin Normal University | Sun J.-N.,Harbin Normal University | Zhao L.-P.,Mudanjiang Teachers College | And 2 more authors.
Guangzi Xuebao/Acta Photonica Sinica | Year: 2012

Based on the heat conduction theory, a two-dimensional axis symmetric transient physical model was established, of which GaAs was irradiated by Gauss laser. By solving the heat conduction equations using COMSOL Multiphysics analysis software, the curve of material surface temperature and the relationship between the temperature at the center of the light spot and material thickness were obtained, and then the relationship between threshold damage time of GaAs and the incident light power density was gained. The calculation results show that the laser induced damage is mostly decomposition damage in the areas where temperature exceeds decomposition temperature of material. The theoretical analyzing result is in accordance with the relative experimental result, so the laser irradiation effect model proves correct.


Shao Y.,Jilin University | Shao Y.,Mudanjiang Teachers College | Guan J.,Jilin University | Wu S.,Jilin University | And 3 more authors.
Microporous and Mesoporous Materials | Year: 2010

Two acid-base bifunctional mesoporous materials Benzyl-APS-S-SBA-15 and Anthracyl-APS-S-SBA-15 (APS: (3-trimethoxysilanyl-propyl)-amine) were successfully synthesized by a direct synthesis method. The influence of steric hindrance upon prevention of interaction between acid and base was investigated by using two different secondary amines, benzyl-(3-trimethoxysilanyl-propyl)-amine and anthracyl methyl-(3-trimethoxysilanyl-propyl)-amine. X-ray diffraction (XRD), N2 adsorption, thermogravimetric analysis (TGA), scanning electron micrographs (SEM), transmission electron micrographs (TEM), elemental analysis, back titration, and 29Si magic-anglespinning (MAS) NMR were employed to characterize the synthesized mesoporous bifunctional materials. The experimental results indicate that the guests can be well dispersed in the channel of SBA-15, and the obtained materials exhibit excellent acid-basic properties, which make it possess high activity for the aldol condensation of acetone with 4-nitrobenzaldehyde. © 2009 Elsevier Inc. All rights reserved.


Sun J.,Harbin Normal University | Sun W.,Harbin Normal University | Zhao L.,Mudanjiang Teachers College | Li J.,Harbin Normal University | And 2 more authors.
Guangxue Xuebao/Acta Optica Sinica | Year: 2012

Based on the predecessor's theoretical achievements, probabilistic analysis for realizing terahertz (THz) radiation of lasers by strict calculation method is given. The distributions of conduction subband structure and the electron wave function of GaN-based three-level quantum cascade lasers are solved with the transfer matrix method by Matlab, the polarization field of material is analyzed detailedly. The relationships among dipole matrix element, applied external electric field, the barrier layer of Al composition and energy difference of conduction subband in near-resonant conditions are calculated, and their effects on properties of lasers are studied. The analysis of the results shows that realizing stimulated radiation is very strict, it is proper that the composition of Al is 0.15 or 0.16, and the external electric field intensity is greater than 63 kV/cm, but is not too large. In this case, the near-resonant conditions can be satisfied, so that population inversion is realized to reach THz quantum cascade lasing. While the largest dipole matrix element is obtained at the composition of Al of 0.15 and the external electric field intensity of 69.0 kV/cm, indicating that transition probability is also the largest. It is beneficial for the properties of lasers, thus the preferable active region can be constructed for quantum cascade lasers.


Cai H.,Mudanjiang Teachers College | Bian S.,Tianjin Environment Monitoring Center
Acta Theriologica Sinica | Year: 2015

Rodents were trapped using snap traps from 2011 to 2013 at 31 sites in six habitats in the Tianjin Palecoast and Wetland Natural Reserve (TPWNR)and ten environmental variables were recorded for each site. In total, 157 individuals were captured comprising 7 species. The total trap capture success rate was 1.69%. There were three dominant rodents: Apodemus agrarius, Rattus norvegicus, and Cricetulus triton, for which trap capture successes were 0.59%, 0.25%, and 0.23%, respectively. The trap capture success rates, species richness, Shannon and Pielou index were significantly difference among the six habitats. The highest trap capture successes were found in areas with human habitation and cropland, followed by water's edge; the remaining habitats were low. The highest values for both species richness and Shannon index were found in human inhabited areas and cropland, and the lowest value were found in alkali area habitat. The Pielou index was high in different habitats except of the water's edge habitat. These results indicate that there was significant variation among the rodent communities in TPWNR. Such variations were controlled by environmental factors. The result of redundancy analysis with forward selection indicated that distance to crops, herbaceous coverage, water salinity and shrub height played key roles in defining the structures of rodent communities in TPWNR. ©, 2015, Science Press. All right reserved.


Tan R.,Northeast Normal University | Tan R.,Mudanjiang Teachers College | Ren Y.,Mudanjiang Teachers College | Wang X.,Northeast Normal University | Li R.,Jilin University
Zeitschrift fur Anorganische und Allgemeine Chemie | Year: 2011

A rare tetra-yttrium-supported Krebs-type tungstoantimonate was prepared in an acidic solution at pH 2.2 and characterized by elemental analysis and IR spectroscopy. Single-crystal X-ray analysis was carried out on Na 2[{Y(H2O)7}4Sb2W 22O76]·14H2O (1), which comprises a Krebs-type [Sb2W22O76]14- unit supported by four yttrium ions. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Loading Mudanjiang Teachers College collaborators
Loading Mudanjiang Teachers College collaborators