Hebei Normal University is a university in Hebei, China under the provincial government. Hebei Normal University is a provincial key university with a hundred-year history. The university originated from Shuntian School established in Beijing in 1902 and Beiyang Women Normal School established in Tianjin in 1906.Approved by Hebei provincial government, the former Hebei Teachers University, Hebei Teachers College, Hebei Education Institute established in 1952 and Hebei Vocational and Technological College merged into one in June 1996 and was named Hebei Normal University. Hebei Normal University is an early-established large-scale university in China. The names of many great revolutionary pioneers such as Deng Yingchao, Liu Qingyang, Guo Longzhen, Yang Xiufeng and Kang Shien are on the list of graduates. A group of famous scholars like Liang Suming, Zhang Shenfu and Tang Yongtong and others are on the list, too. Among the graduates are some academicians such as Yan Luguang and Hao Bolin and famous coaches and athletes who won championship in international games such as Xu Shaofa and Cai Zhenhua. Since New China was founded in 1949, Hebei Normal University has trained more than 200,000 people with professional skills. Wikipedia.
Liu Z.,Cornell University |
Zhang S.,Hebei Normal University |
Wise F.W.,Cornell University
Optics Letters | Year: 2015
Experimental evidence of rogue-wave formation in a normal-dispersion ytterbium fiber laser is reported. Spectral filtering is a primary component of pulse-shaping in normal-dispersion lasers, and we find that the choice of filter dramatically influences the distribution of noise-pulse energies produced by these lasers. With an interference filter in the cavity, non-Gaussian distributions with pulses as large as 6 times the significant wave height are observed. These correspond to pulse energies as high as ∼50 nJ. To our knowledge, the results presented are not accounted for by existing theoretical models of rogue-wave formation. © 2015 Optical Society of America.
Wu M.,Hebei Normal University |
Ma T.,Dalian University of Technology |
Ma T.,Kyushu Institute of Technology
Journal of Physical Chemistry C | Year: 2014
To realize long-term developments and practical application of the dye-sensitized solar cells (DSCs) requires a robust increase of the power conversion efficiency (PCE) and a significant decrease of the production cost. Fortunately, a new record PCE value of 12.3% was achieved by using cobalt-based redox couples combined with organic dye. Evidently, dye design is the key path to improve the PCE, while developing low cost counter electrode (CE) catalysts is one of the promising paths to reduce the production cost of DSCs by replacing the expensive Pt CE. In this article, we review the recent progress of CE catalysts involving Pt, carbon materials, inorganic materials, multiple compounds, polymers, and composites. We discuss the advantages and disadvantages of each catalyst and put forward ideas for designing new CE catalysts in future research for DSCs and other application fields. © 2014 American Chemical Society.
Wu M.,Hebei Normal University |
Ma T.,Dalian University of Technology
ChemSusChem | Year: 2012
Sun sans Pt: This Minireview summarizes the development of platinum-free catalysts for use as counter electrodes in dye-sensitized solar cells. These catalysts comprise various metals, carbon materials, conductive polymers, and inorganic materials (transition metal carbides, nitrides, oxides, sulfides, and phosphides). The research work reported so far highlights the importance of a proper match between counter electrode catalyst and redox couple. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Li B.,Hebei Normal University
CMES - Computer Modeling in Engineering and Sciences | Year: 2014
In this paper, operational matrix method based on the generalized hat functions is introduced for the approximate solutions of linear and nonlinear fractional integro-differential equations. The fractional order generalized hat functions operational matrix of integration is also introduced. The linear and nonlinear fractional integro-differential equations are transformed into a system of algebraic equations. In addition, the method is presented with error analysis. Numerical examples are included to demonstrate the validity and applicability of the approach. Copyright © 2014 Tech Science Press.
Geng L.,Hebei Normal University
Synthetic Metals | Year: 2010
Polypyrrole (PPy) and WO3 were prepared by chemical oxidation polymerization and emulsion method, respectively. PPy/WO3 hybrid materials with different PPy mass percent were prepared by mechanical mixing. WO3 and PPy/WO3 hybrids were characterized by XRD, SEM and HRTEM, and the sensitivity studies of PPy, WO3 and PPy/WO 3 to toxic gases NH3, H2S, NOx were also carried out. It was found that the particle size of WO3 was about 29 nm, and PPy/WO3 was about 50-100 nm. Gas sensitivity tests showed that when operated at 90 °C, PPy/WO3 hybrids had better reversibility to H2S than PPy higher sensitivity and selectivity to H2S than WO3. PPy/WO3 materials had short response-recovery time to H2S and their sensitivities had linear relationship with the concentration of H2S. The sensitive mechanism of PPy/WO3 materials to H2S may be the co-effect of proton doping process and the n-type semiconductor's effect. © 2010 Elsevier B.V.
Deng J.,Hebei Normal University
Synlett | Year: 2011
Jia Deng was born in 1987 at Shijiazhuang, Hebei Province, P. R. of China. He graduated from the College of Shijiazhuang in 2009 and received his B.Sc. degree. Presently he works as a postgraduate towards his M.Sc. under the supervision of Professor Zhan-Hui Zhang at Hebei Normal University. His research interest focuses on the development of new synthetic methodologies for heterocyclic compounds. © Georg Thieme Verlag Stuttgart - New York.
Zhang H.,Hebei Normal University |
Zhou C.,Hebei Normal University
Plant Molecular Biology | Year: 2013
Leaf senescence is a complex developmental phase that involves both degenerative and nutrient recycling processes. It is characterized by loss of chlorophyll and the degradation of proteins, nucleic acids, lipids, and nutrient remobilization. The onset and progression of leaf senescence are controlled by an array of environmental cues (such as drought, darkness, extreme temperatures, and pathogen attack) and endogenous factors (including age, ethylene, jasmonic acid, salicylic acid, abscisic acid, and cytokinin). This review discusses the major breakthroughs in signal transduction during the onset of leaf senescence, in dark- and drought-mediated leaf senescence, and in various hormones regulating leaf senescence achieved in the past several years. Various signals show different mechanisms of controlling leaf senescence, and cross-talks between different signaling pathways make it more complex. Key senescence regulatory networks still need to be elucidated, including cross-talks and the interaction mechanisms of various environmental signals and internal factors. © 2012 Springer Science+Business Media Dordrecht.
Ding K.-Q,Hebei Normal University
International Journal of Electrochemical Science | Year: 2010
For the first time, copper particles were successfully prepared onto a MnO2-modified graphite electrode by cyclic voltammetry (CV) technique, giving rise to a Cu-coated MnO2-modified (denoted as Cu/MnO2) graphite electrode. EIS(electrochemical impedance spectroscopy), SEM (scanning electron spectroscopy), EDS (electron diffraction spectroscopy) and FTIR (Fourier transform infrared spectrometry) were all employed to characterize the obtained samples, proving that Cu decorated MnO2 composites were fabricated. And then, this resultant composite-modified graphite electrode was employed in oxygen reduction reaction (ORR) and the obtained cyclic voltammograms (CVs) strongly verified that ORR could proceed on this resultant composite. Lastly, the possible catalysis mechanism of Cu-MnO2 towards ORR was proposed based on the results we acquired. Developing a novel substrate having Cu particles and MnO2 on which ORR could proceed is the main contribution of this work. © 2010 by ESG.
Ding K.,Hebei Normal University
International Journal of Electrochemical Science | Year: 2010
Firstly, manganese dioxides were electrodeposited on a graphite electrode by cyclic voltammetry (CV) from an aqueous solution of 0.1 M Na2SO4 containing 5 mM MnSO4, and then the palladium (Pd) particles were prepared onto the resultant MnO2 by a potentiostatic method. Scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX) were used to characterize the resultant samples, and it is demonstrated that Pd coated MnO2 composites (denoted as Pd/MnO2) are successfully fabricated for the first time. Lastly, the Pd/MnO2 modified graphite electrode is employed toward oxygen reduction reaction (ORR), revealing that the catalysis of Pd/MnO2 composites for ORR is superior to that of the pure MnO2 material. Also, the possible catalysis mechanism of Pd/MnO2 for ORR is proposed based on our data. Presenting a novel material of Pd/MnO2 and verifying its electrocatalysis for ORR are the main contributions of this preliminary work. © 2010 by ESG.
News Article | September 29, 2016
Plants survive in high-salt soils through a signaling pathway using salt-responsive calmodulin proteins, which trigger cells to change their internal ion balance. A group led by Liqun Zhao of Hebei Normal University in Shijiazhuang, China, report the findings in a study published September 29, 2016 in PLOS Genetics.