Chifeng, China

Chifeng University

www.cfxy.cn
Chifeng, China

Approved by the Ministry of Education of the People's Republic of China in 2003, Chifeng University was founded as a public, full-time and comprehensive undergraduate university by the combination of the Chifeng Normal College of Nationalities and other four academies. It is located in the city of Chifeng, the birthplace of the Hong Shan Cultures. The city has scenic spots and is a tourist destination. The university has 24 colleges or departments Wikipedia.

SEARCH FILTERS
Time filter
Source Type

Liu C.-H.,Chifeng University
Advances in Intelligent Systems and Computing | Year: 2017

Combining interval-valued intuitionistic fuzzy sets, t-norm T and s-norm S on D [0, 1] with the notion of ideal in lattice implication algebras, the concepts of interval-valued intuitionistic (T, S)-fuzzy LI-ideal and interval-valued intuitionistic (T, S)-fuzzy lattice ideal are introduced, some their properties are investigated. Some characterization theorems of interval-valued intuitionistic (T, S)-fuzzy LI-ideals are obtained. It is proved that the notion of interval-valued intuitionistic (T, S)-fuzzy LIideal is equivalent to the notion of interval-valued intuitionistic (T, S)-fuzzy lattice ideal in a lattice H implication algebra. © Springer International Publishing Switzerland 2017.


Zhu H.,Chifeng University
World Transactions on Engineering and Technology Education | Year: 2015

This article briefly describes the present situation with on-line higher education teaching in the information age. The author analyses the characteristics of the MOOC and SPOC, proposes and constructs a new model of on-line education in the post-MOOC period; namely, the teaching mode of SPOC based on - self-directed learning - collaborative learning - hybrid learning (S+C+H). Taking the teaching practice of an engineering graphics course as an example, the article displays the personalised self-directed learning mode with resource sharing, the collaborative learning mode with simultaneous joint teaching in different places and the hybrid learning model with flipped classes. The scope of the new model is that it will gradually break the traditional pattern of cramming education. © 2015 WIETE.


Sun F.,Chifeng University | Jin R.,Chifeng University
Journal of Luminescence | Year: 2014

A series of N-butyl-1,8-naphthalimide derivatives have been designed to explore their optical, electronic, and charge transport properties as charge transport and/or luminescent materials for organic light-emitting diodes (OLEDs). The frontier molecular orbitals (FMOs) analysis has turned out that the vertical electronic transitions of absorption and emission are characterized as intramolecular charge transfer (ICT). The calculated results show that the optical and electronic properties of N-butyl-1,8-naphthalimide derivatives are affected by the substituent groups in 4-position of 1,8-naphthalimide ring. Our results suggest that N-butyl-1,8-naphthalimide derivatives with biphenyl (1), 2-phenylthiophene (2), 2-(thiophen-2-yl)thiophene (3), 2,3-dihydrothieno[3,4-b] [1,4]dioxine (4), 2-phenyl-1,3,4-oxadiazole (5), benzo[c][1,2,5]thiadiazole (6), benzo[c]thiophene (7), and benzo[d]thieno[3,2-b]thiophene (8) fragments are expected to be promising candidates for luminescent materials for OLEDs, particularly for 1-3 and 5. In addition, 7 and 8 can be used as promising hole transport materials for OLEDs. © 2014 Elsevier B.V.


Jin R.F.,Chifeng University | Chang Y.F.,Northeast Normal University
Physical Chemistry Chemical Physics | Year: 2015

A series of D-π-A star-shaped molecules with triphenylamine (TPA) as a core, 1,8-naphthalimide (NI) derivatives as end groups, and different p-bridges have been designed to explore their optical, electronic, and charge transport properties as organic solar cell (OSC) materials. The calculation results showed that the star-shaped molecules can lower the material band gap and extend the absorption spectrum towards longer wavelengths. The designed molecules own the longest wavelength of absorption spectra, oscillator strength, and absorption region values. Our results suggest that the designed molecules are expected to be promising candidates for OSC materials. Additionally, the molecules with ethyne, thiophene, benzo[c][1,2,5]thiadiazole (BTA), and 2,3-dihydrothieno[3,4-b][1,4]dioxine (DTD) as π-bridges and 4-pyridne, 4-aniline, and H in NI fragments have better hole- and electron transporting balance and can act as nice ambipolar materials. The values of hole mobility of molecules with ethyne as a π-bridge and NI as an end group for Pna21 and P21/c are 5.30 × 10-3 and 1.27 × 10-2 cm2 V-1 s-1, respectively. On the basis of the investigated results, we suggest that molecules under investigation are suitable donors of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) and its derivatives are acceptors of solar cells. © the Owner Societies 2015.


The interactions between chemosensors, donor-π-acceptor (D-π-A) dipolar organoboron derivatives, and different (CN-, F-, Cl-, and Br-) anions have been theoretically investigated using DFT approaches. Theoretical investigations have been performed to explore the optical, electronic, charge transport, and stability properties of organoboron derivatives as charge transport and luminescent materials for organic light emitting devices (OLEDs). It turned out that the unique selectivity of organoboron derivatives for F-/CN- is ascribed to the formation of chemosensors complexes. The frontier molecular orbitals (FMOs) and local density of states analysis have turned out that the vertical electronic transitions of absorption and emission for chemosensors and their F-/CN- complexes are characterized as intramolecular charge transfer (ICT). The formation of complexes has effect on the distribution of FMOs and the flowing direction of electronic density for vertical transition. The study of substituent effects suggests that the derivatives with thiophene (2), furan (3), and 1H-pyrrole (4) fragments, are expected to be promising candidates for ratiometric fluorescent fluoride and cyanide chemosensors as well as chromogenic chemosensors, whereas derivatives with pyridine (5) and pyrimidine (6) fragments can serve as chromogenic chemosensors only. Furthermore, all the derivatives are promising luminescent and hole transport materials and 2, 3, 5, and 6 can serve as electron transport materials for OLEDs.


The interactions between chemosensors, organosilicon 1,8-naphthalimide derivatives, and different (F-, Cl-, Br-, and AcO-) anions have been theoretically investigated using Density functional theory (DFT) approaches. Theoretical investigations have been performed to explore the optical and electronic properties of the colorimetric fluoride anion chemosensors. It turned out that the unique selectivity of chemosensors for F- is ascribed to their ability of the cleavage of OSi bond of the host sensors. The frontier molecular orbitals (FMOs) analyses have turned out that the vertical electronic transitions of chemosensors and their anions are characterized as intramolecular charge transfer (ICT). The study of substituent effects suggests that the substituted derivatives with nitrobenzene (1), anisole (2), benzo[c][1,2,5]thiadiazole (3), benzo[c]thiophene (4), and 2-phenylthiophene (5) fragments are expected to be promising candidates for colorimetric fluoride anion chemosensors. © 2014 Elsevier B.V.


Shang Y.J.,Chifeng University
Xi bao yu fen zi mian yi xue za zhi = Chinese journal of cellular and molecular immunology | Year: 2012

To detect the expression of B and T lymphocyte attenuator (BTLA) antigen in synovial tissues from rheumatoid arthritis (RA) patients. The expression and distribution of BTLA antigen was analyzed by immunohistochemistry. Moreover, fluorescence double-staining was used to further identify the cell types expressing BTLA. Immunohistochemical analysis revealed that a great deal of BTLA positive cells were found in RA synovium, and fluorescence double-staining further demonstrated that BTLA positive cells were CD3(+); T cells, CD68(+); macrophages, and occasionally CD31(+); endothelial cells. In contrast to other members of B7 superfamily, the expression of BTLA was also found on B7-H1(+);, B7-H4(+); and HVEM(+); cells, while it was absence on B7-DC(+); cells as well as B7-H3(+); cells. The expression of BTLA has been observed on the surface of several kinds of cells within synovial tissues of RA patients, which indicates this signal might be involved in the regulation of local T cell activation and the pathogenesis of RA.


Jin R.,Chifeng University
Journal of Molecular Structure: THEOCHEM | Year: 2010

The structural and electronic properties of juglone and its derivatives and their radicals were investigated at density functional level. The topology of electron density and the hydrogen bond properties of the studied structures were investigated using the Atoms in Molecules (AIM) theory. It turned out that the presence of the dihydroxy functionality increases the radical stability through hydrogen bond formation and favors hydrogen atom abstraction. The introduction of electron-donating groups for the molecules increases the activities of antioxidants. Moreover, juglone and its derivatives appear to be good candidates for the one-electron-transfer mechanism. Their planar conformation and the extended electronic delocalization between adjacent rings determine low ionization potential (IP) values, and it can be further improved by the introduction of the electron-donating groups for the molecules. © 2009 Elsevier B.V. All rights reserved.


Jin R.,Chifeng University
Journal of Fluorine Chemistry | Year: 2011

The interactions between chemosensor, 2-(2′-hydroxyphenyl)-4- phenylthiazole (1), and different halides (F-, Cl-, and Br-) and NO3- anions have been theoretically investigated at the B3LYP/6-31G(d) level with the BSSE correction. It turned out that the unique selectivity of 1 for F- is ascribed to its ability of deprotonating the hydroxy group of host sensor. The intermolecular proton transfer (IPT) causes the colorimetric and fluorescent signaling of 1 for F -. The deprotonated complex 1-·HF is formed for the deprotonation process of chemosensor. The study of substituent effects suggest that the electron-donating -CH3 and -OCH3 substituted derivatives are expected to be promising candidates for ratiometric fluorescent F- chemosensors as well as chromogenic chemosensors, while electron-donating -N(CH3)2 substituted derivative can serve as chromogenic F- chemosensors only. Furthermore, the electron-withdrawing (-NO2 and -Br) substituted derivatives can serve as chromogenic F-/CH3COO- chemosensors. © 2011 Published by Elsevier B.V. All rights reserved.


A series of donor-π-acceptor type of 1,8-naphthalimide derivatives with ethylene as π-conjugated bridges have been designed to explore their optical and electronic properties as luminescent materials for organic light-emitting diodes (OLEDs). The frontier molecular orbital analysis turned out that the vertical electronic transitions of absorption and emission are characteristic as intramolecular charge transfer. The calculations showed that their optical and electronic behaviours are clearly affected by the aromatic substitute groups, but not significantly to the stability of molecules. The calculated results suggest that all the selected candidates are promising as luminescent materials for OLEDs. © 2013 Taylor and Francis Group, LLC.

Loading Chifeng University collaborators
Loading Chifeng University collaborators