Hebei Normal University of Science and Technology

www.hevttc.edu.cn
Qinhuangdao, China

Hebei Normal University of Science and Technology is a university in Hebei, China under the provincial government. Established in 1941, Hebei Normal University of Science and Technology started the undergraduates program in 1977. In 1999, HNUST was authorized by China Ministry of Education as one of the first key bases for training teachers of vocational education. In 2003, it was renamed as Hebei Normal University of Science and Technology. There are 21 educational departments. 44 undergraduate specialties and 59 technological studies are run at the school, covering disciplines of Agriculture, Engineering, Arts, Science, Law, Economy, Management and Education and four disciplines are authorized to grant master degrees. Hebei Normal University of Science and Technology adheres to integrating production, education and research to facilitate the practical transformation of scientific research fruits and to fully display the advantages of agricultural specialty. Since the 11th five-year National Developing Program, the University has successfully breed 29 new species with our own property rights, and won 11 provincial awards for scientific progress. One of them is YanLong, a new species of Chinese chestnut and a new tomato have been funded by national funding for production transformation. Wikipedia.

SEARCH FILTERS
Time filter
Source Type

Ma Y.-Q.,Hebei Normal University of Science and Technology
Materials Transactions | Year: 2013

With different high pressure heat treatments on CuAl alloy, the effects on microstructure and thermal expansion coefficients of CuAl alloy are studied in the paper by optical microscopy, scanning electron microscopy, transmission electron microscopy and expansion instrument etc. The experimental results show that after heat treatment, the structure of CuAl alloy was refined obviously and the compactness increased. The grain refinement effect increases at first and then decreases when pressure is increased. When the pressure is 3 GPa, the most obvious is the thinning grain effect. In addition, the high pressure heat treatment can increase CuAl alloy thermal coefficient of expansion, when the CuAl alloy is treated by 3 GPa pressure and is at 596.37°C. Thermal expansion coefficient is the biggest, 3.1187 × 10 -5°C10-1, than that of the same temperature cast state samples increase 99.34%. © 2013 The Japan Institute of Metals.


Zhang X.-F.,Hebei Normal University of Science and Technology | Yang X.,Hebei Normal University of Science and Technology
Journal of Physical Chemistry B | Year: 2013

Photosensitizers that selectively generate singlet oxygen in non polar/polar microenvironments are highly desirable for photodynamic therapy of tumor but not yet reported. BODIPY (boron-dipyrromethene complexes) covalent dimer 1 is such a photosensitizer that forms singlet oxygen only in hexane, cyclohexane, and toluene significantly but not in polar solvents. Its corresponding monomer is not photoactive in any solvents for forming singlet oxygen. To reveal the mechanism, we measured the excited triplet-, singlet-, and ground-state properties as well as singlet oxygen generation capability with laser flash photolysis, fluorescence spectroscopy, time-correlated single photon counting, and absorption spectroscopy in various solvents. The striking difference is due to the fact that the excited dimer (excimer) undergoes very fast intramolecular charge transfer (ICT) that makes intersystem crossing noncompetitive in polar solvents, while ICT is negligible in nonpolar solvents. © 2013 American Chemical Society.


Zhang X.-F.,Hebei Normal University of Science and Technology | Yang X.,Hebei Normal University of Science and Technology
Journal of Physical Chemistry B | Year: 2013

The excited triplet-, singlet-, and ground-state properties as well as singlet oxygen generation capability of four brominated BODIPY dyes were measured in toluene with laser flash photolysis, fluorescence spectroscopy, time-correlated single-photon counting, and absorption spectroscopy. The triplet-triplet (T1-Tn) absorption spectra were identified for four dyes 1B, 2B, 4B, and 6B substituted with one, two, four, and six Br atoms, respectively. The triplet quantum yield (ΦT) of a usual BODIPY dye is negligible and has rarely been studied. So is the case for the parent compound 0B (8-phenyl boron-dipyrromethene), in which no Br atom is present. The substitution of the first Br atom into the π ring of BODIPY allowed a dramatic increase of ΦT from 0.0 of 0B to 0.39 for 1B. The further addition of Br number increased ΦT to 0.46, 0.50, and 0.66 for 2B, 4B, and 6B, respectively. The triplet lifetimes τT are also fairly long, which is 43, 39, 36, and 26 μs, for 1B, 2B, 4B, and 6B, respectively. The brominated BODIPY dyes are therefore efficient singlet oxygen photosensitizers with the formation quantum yield of 0.39, 0.45, 0.49, and 0.64 for 1B, 2B, 4B, and 6B, respectively. The result indicates their potential application in photodynamic therapy of cancer. The fluorescence properties of the dyes were also measured. © 2013 American Chemical Society.


Zhang X.-F.,Hebei Normal University of Science and Technology
Coordination Chemistry Reviews | Year: 2015

Tetrabenzotriazacorrole (TBC) complexes are tetrapyrrolic aromatic corrole macrocycles, which are phthalocyanine (Pc)-like and are new members of the porphyrin family. A TBC molecule is a chemically reduced Pc. Because of their distinct structural, electronic and UV-vis spectroscopic features, and electrochemical behavior, TBCs have many potential applications. This paper reviews the latest synthesis, characterization, properties, and applications of TBC compounds. The opportunities for further research on TBCs are also discussed. © 2014 Elsevier B.V.


Zhang X.-F.,Hebei Normal University of Science and Technology
Photochemical and Photobiological Sciences | Year: 2010

UV-vis absorption, steady state fluorescence emission, time-correlated single photon counting and laser flash photolysis methods were employed to examine the excited state properties of fluorescein derivatives to understand the mechanism that controls their fluorescence efficiency. The fluorescein derivatives contain amino, t-butyl, carboxyl or nitro on their phenyl moieties, respectively. These substituents are not directly connected to the fluorophore but still showed a very remarkable effect on the fluorescence properties. Compared to fluorescein, the introduction of nitro, a strong electron withdrawing group, or amino, a strong electron donating group, caused a substantial quenching of both the fluorescence quantum yield and lifetime. The presence of a t-butyl or carboxyl, on the other hand, caused a smaller decrease. The mechanism for the substituent effect is due to the involvement of an additional de-excitation process, i.e. intramolecular photoinduced electron transfer (PET). The thermodynamics and kinetics of PET were analyzed. Depending on the nature of the substituent, the xanthenic ring acts as an electron acceptor (or donor), while the phenyl moiety is the corresponding electron donor (or acceptor) in PET. The rate constant of PET for the amino case is larger than 4.79 × 109 s-1, while for nitro substitution it is 0.67 × 109 s-1. Both values are much larger than the radiation rate constant of 0.20 × 109 s-1, meaning that PET plays important roles in the deactivation of S1 for the two dyes. The charge transfer state generated by PET was observed by laser flash photolysis. © 2010 The Royal Society of Chemistry and Owner Societies.


Zhang X.-F.,Hebei Normal University of Science and Technology | Xi Q.,Hebei Normal University of Science and Technology
Carbon | Year: 2011

Tetrasulfonated zinc phthalocyanine (Pc) was bound to graphene (G) sheets by the π-π stacking supermolecular method. The few-layer graphene sheets were obtained by chemically reducing graphite oxide and characterized by AFM, IR and UV-vis absorption methods. Photoinduced electron transfer (PET) within the nano assembly is revealed by laser flash photolysis, time resolved and steady state fluorescence, as well as UV-vis absorption techniques. A graphene sheet can be attached by up to 52,000 Pc molecules to form a super molecule G(Pc) 52,000, in which many Pc molecules can be simultaneously photoexcited to the S1 state. One graphene sheet can simultaneously quench thousands of excited Pcs with a large rate constant of the order of 10 16 M-1 s-1 by PET. A graphene sheet not only accepts electrons from the excited Pcs on it but also delivers the captured electrons to its unexcited Pcs to form (Pc+)nG(Pc -)n, so that a large electron charge (i.e. n >> 1) is separated between unlinked Pc molecules with a small energy loss. These novel features of PET are explained by the following unique properties of graphene: (i) its excellent electron-transport and multi-electron-accepting ability, (ii) its multi-chromophore binding and concurrent multi-photon absorbing ability. © 2011 Elsevier Ltd. All rights reserved.


Liu X.,Hebei Normal University of Science and Technology
Advances in Information Sciences and Service Sciences | Year: 2012

The problem of evaluating the risk management of trade enterprise with interval intuitionistic trapezoidal fuzzy information is the multiple attribute decision making (MADM) problems. In this paper, we investigate the multiple attribute decision making (MADM) problems for evaluating the risk management of trade enterprise with interval intuitionistic trapezoidal fuzzy information. We utilize the interval intuitionistic trapezoidal fuzzy weighted geometric (IITFWG) operator to aggregate the interval intuitionistic trapezoidal fuzzy information corresponding to each alternative and get the overall value of the alternatives, then rank the alternatives and select the most desirable one(s) according to the score function and accuracy function. Finally an illustrative example has been given to show the developed approach.


Xu R.,Hebei Normal University of Science and Technology
European Food Research and Technology | Year: 2012

Oat is a species of cereal grain grown for its seed and widely accepted to contain many valuable constituents. These include especially fibre that posses important biological properties, particularly with regard to promotion of health, as well as to prevention of diseases. Reducing risk of coronary heart disease and plasma LDL cholesterol has, indeed, been associated with such oat fibre. The most important advances reported to date pertaining to biological properties of oat fibre are reviewed in this communication. The purpose of this review is to focus on available knowledge on the interactions between insoluble or soluble dietary fibre and lipid metabolism in the human body. © 2012 Springer-Verlag.


Ma Y.-Q.,Hebei Normal University of Science and Technology
Materials Transactions | Year: 2013

The hardness, compressive yield strength and electrical conductivity of CuCrNiAl alloy before and after 4 GPa pressure treatment were measured, and the microstructure of the CuCrNiAl alloy before and after 4 GPa pressure treatment were analyzed by metallurgical microscope, transmission electron microscopy and scanning electron microscope. Based on the experimental results, the effects of 4 GPa pressure heat treatment on the mechanical properties and electrical conductivity of CuCrNiAl alloy were discussed. The results showed that 4 GPa pressure treatment can increase the hardness and compressive yield strength of the CuCrNiAl alloy, and reduce its electrical conductivity. After 4 GPa pressure treatment and aged at 500°C for 1 h, higher mechanical properties and electrical conductivity of CuCrNiAl alloy could be obtained. © 2013 The Japan Institute of Metals and Materials.


Liu X.,Hebei Normal University of Science and Technology
International Journal of Digital Content Technology and its Applications | Year: 2012

The problem of evaluating the competitiveness of China's tourism trade in service with uncertain linguistic information is the multiple attribute decision making (MADM) problems. In this paper, we investigate the multiple attribute decision making (MADM) problems for evaluating the competitiveness of China's tourism trade in service with uncertain linguistic information. We utilize the interval uncertain linguistic weighted average (IULWA) operator to aggregate the uncertain linguistic information corresponding to each alternative and get the overall value of the alternatives, then rank the alternatives and select the most desirable one(s) by using the formula of the degree of possibility for the comparison between two uncertain linguistic variables. Finally, an illustrative example for competitiveness of China's tourism trade in service with uncertain linguistic information is given.

Loading Hebei Normal University of Science and Technology collaborators
Loading Hebei Normal University of Science and Technology collaborators