Hefei University is an institution of higher learning in Hefei, capital of Anhui Province, the People's Republic of China. It was founded in 1980, after the merger of former Hefei Union University, Hefei Education College and Hefei Normal School.Hefei University has 16 departments, 5 centers of research together with a further education college, offering 40 bachelor degree programs with a full-time student population totaling 12,527（as to December 2007）on two campuses, the Downtown Campus and the Nanyanhu Lake Campus. The university's strength lies in engineering, economics and management, and it also comprises literature, science and education.The vision of HU is focused on“regionalization, practicability and internationalization”.HU aims at educating students to become specialized professionals with practical knowledge and skills to meet the needs of regional job markets with international perspectives.Aiming to serve the regional economy,HU sticks to its philosophy “nurturing students with morality through practical curriculum and teaching methods”. HU has always been encouraging teaching reforms so as to equip its graduates with practical competence and skills for their future career. In the recent years “N+2 Assessment System” has been introduced at HU, by which students are evaluated on the basis of their academic learning together with the final exams at each semester. The “9-Semester System” is specially designed in which sophomores are required to have a single semester for field learning before continuing their further academic studies in order to strengthen problem solving skills required for the professional career in the future.HU has extraordinary faculty and efficient administrative staff to ensure the quality of service to its students.HU encourages its faculty to participate in the development of regional economy,by which they will nurture its students with academic training combined with the industry skills. Professors at HU are also involved in natural science research programs at provincial, national and international level. Various prizes have been awarded for their academic excellence for their papers and books published in Chinese, English and German magazines.Young as HU is, HU has been contributing to mutual growth and international cultural cooperation through exchanges programs with universities and institutions around the world. HU has been engaged in various programs with Germany for faculty training, exchange of students and joint development for some of its departments since the early 1980s. HU now has 9 sister universities in Germany，mainly with the applied science universities in line with HU's mission.Programs of student exchange and faculty training have been expanding with cooperation on some dual degree programs since 2000. HU started similar programs in South Korea since the late 1990s and so far it has 7 sister universities in South Korea with exchange programs for students and faculty and dual degree programs in language, Tourism Management, Computer Science and Chinese Teaching.Diversity is one of the distinctive features of HU. Each year some 50 foreign students are admitted into HU for Chinese language and culture learning. And joint workshops and internship/thesis writing are also arranged on the campus for international students from sister universities. International seminars on education, rural development, tourism management and environmental protection were also hosted with participants from Germany, Korea, Japan, Singapore and other countries. In addition to Germany and Korea, HU also has cooperation relations with universities in the United States, Austria, Thailand, Britain and Spain as well. International professors from Germany, Korea, the United States, Canada, Australia and Japan are recruited to teach and research on the campus each year.HU takes the overall development of its students as prime priority besides academic learning. Various clubs, organized and administrated by the students, are sponsored by HU to meet the physical, moral, cultural and social interests and needs of students. Students excel in academic studies and are active in sports and other events in and outside of campus. Fencing and robots design enjoys prestigious reputation in China.Students from HU are awarded in the National Undergraduate Electronic Design Contest. The Foreign language club is well known in Hefei City and attracts foreign language learners. Students fulfill their social and civic responsibilities by doing volunteer work in local communities and rural areas. For many years the graduates of HU have been well-accepted for their honesty and dependability with practical competence and skills.The current president is Cai Jinming. Wikipedia.
Si J.,Hefei University |
Yang H.,Anhui Agricultural University
Materials Chemistry and Physics | Year: 2011
Bio-compatible and superparamagnetic Fe3O 4@Polydopamine nanocomposites with well-defined core/shell nanostructures have been successfully synthesized by using an in situ self-polymerization method. The size of the core/shell product can be controlled by varying the size of the central Fe3O4 core, and different thicknesses of the PDA shells are obtained by tuning the dopamine monomer concentration. The morphology, phase composition and crystallinity of the as-prepared nanocomposites have been characterized by transmission electron microscopy (TEM) and powder X-ray diffraction (XRD). The 5-dimethylthiazol-2-yl- 2,5-diphenyl-tetrazolium bromide (MTT) cytotoxic analysis shows that the product is biocompatible, with a low toxicity. These unique core/shell materials would be applied in catalyst supports or drug delivery. © 2011 Elsevier B.V. All rights reserved.
Lv X.,Hefei University
Journal of Vibroengineering | Year: 2014
The paper states an analytical method for resolving the problemof scattering of multiple semi-cylindrical hills and the subsurface elastic cylindrical inclusion near the hills to the SH-wave by using of the complex function and moving coordinates. During the analysis, the whole model is divided into two parts, the part I consists of multiple circular domains which include multiple semi-cylindrical hills; the part II consists of multiple semi-cylindrical concaves and an elastic cylindrical inclusion. And then, the displacement solutions that satisfy the boundary conditions are respectively constructed in these two parts. The part I and II are matched up on the common boundary by moving coordinates according to the corresponding condition between the joint faces. At the same time, considering of the boundary condition of the elastic cylindrical inclusion, a set of infinite algebraic equations for resolving of the problem could be obtained. At last, according to the computational results, the paper indicates the influence of the distance between two hills and the buried depth of inclusion on the surface displacement amplitude. © JVE INTERNATIONAL LTD. JOURNAL OF VIBROENGINEERING 2014.
Zhang Z.,Hefei University |
Su J.,Hefei University |
Zha Z.,Hefei University |
Wang Z.,Hefei University
Chemical Communications | Year: 2013
The direct oxidative synthesis of α-ketoamides via anodic oxidation was developed by using dioxygen as a reactant under mild conditions. This methodology has a broad substrate scope (aromatic amines, aliphatic amines and ammonium acetate) and opens up an interesting and attractive avenue for the synthesis of α-ketoamide derivatives. © 2013 The Royal Society of Chemistry.
Deng N.-J.,Hefei University |
Cieplak P.,Sanford Burnham Institute for Medical Research
Biophysical Journal | Year: 2010
RNA hairpin loops are one of the most abundant secondary structure elements and participate in RNA folding and protein-RNA recognition. To characterize the free energy surface of RNA hairpin folding at an atomic level, we calculated the potential of mean force (PMF) as a function of the end-to-end distance, by using umbrella sampling simulations in explicit solvent. Two RNA hairpins containing tetraloop cUUCGg and cUUUUg are studied with AMBER ff99 and CHARMM27 force fields. Experimentally, the UUCG hairpin is known to be significantly more stable than UUUU. In this study, the calculations using AMBER force field give a qualitatively correct description for the folding of two RNA hairpins, as the calculated PMF confirms the global stability of the folded structures and the resulting relative folding free energy is in quantitative agreement with the experimental result. The hairpin stabilities are also correctly differentiated by the more rapid molecular mechanics-Poisson Boltzmann-surface area approach, but the relative free energy estimated from this method is overestimated. The free energy profile shows that the native state basin and the unfolded state plateau are separated by a wide shoulder region, which samples a variety of native-like structures with frayed terminal basepair. The calculated PMF lacks major barriers that are expected near the transition regions, and this is attributed to the limitation of the 1-D reaction coordinate. The PMF results are compared with other studies of small RNA hairpins using kinetics method and coarse grained models. The two RNA hairpins described by CHARMM27 are significantly more deformable than those represented by AMBER. Compared with the AMBER results, the CHARMM27 calculated ΔGfold for the UUUU tetraloop is in better agreement with the experimental results. However, the CHARMM27 calculation does not confirm the global stability of the experimental UUCG structure; instead, the extended conformations are predicted to be thermodynamically stable in solution. This finding is further supported by separate unrestrained CHARMM27 simulations, in which the UUCG hairpin unfolds spontaneously within 10 ns. The instability of the UUCG hairpin originates from the loop region, and propagates to the stem. The results of this study provide a molecular picture of RNA hairpin unfolding and reveal problems in the force field descriptions for the conformational energy of certain RNA hairpin. © 2010 by the Biophysical Society.
Zhu D.,Hefei University |
Zhao S.,Uppsala University
Solar Energy Materials and Solar Cells | Year: 2010
Two important trends in solarthermal utilization in buildings are building integration and color appearance. Coatings based on titanium alloy nitride show variety of different colors. These can be controlled by film thickness for a single layer stack, or by putting another layer on top of the first layer. Strong absorption around 500 nm is important to cause color appearance. Chromaticity and optical properties of colored coatings were studied and compared to black coatings. In the three-point gamut system, such colors show an additive mixture property. Solar absorptance of 0.800.95 can be obtained with thermal emittance of 0.040.09 (100 °C). These coatings provide a choice for solarthermal integration in buildings where appearance is an important feature. © 2010 Elsevier B.V.
Liang H.-W.,Hefei University |
Liu S.,Hefei University |
Yu S.-H.,Hefei University
Advanced Materials | Year: 2010
Template-directed strategy has become one of the most popular methods for the fabrication of one-dimensional (1D) nanostructures with uniform size and controllable physical dimensions in recent years. This Review article describes the recent progress in the synthesis of 1D inorganic nanostructures by using suitable templates. A brief survey on the templating method based on the organic templates and porous membrane is firstly given. Then, the article is focused on recent emerging synthetic strategies by templating against the pre-existing 1D nanostructures using different physical and chemical transformation techniques, including epitaxial growth, nonepitaxial growth, direct chemical transformation, solid-state interfacial diffusion reaction, and so on. The important reactivity role of the 1D nanostructures will be emphasized in such transformation process. Finally, we conclude this paper with some perspectives and outlook on this research topic. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA.
An J.,Hefei University
Applied Mechanics and Materials | Year: 2011
In this paper, the tensile-compression prestressed concrete beam was researched, and gets deflection of the beam subjected to load. Then, the beam was analyzed by the finite element method of ANSYS software. The test and analysis results show that the beam has a good flexibility and the phenomenon of stress concentration were appeared in ends concrete of pre-compressed steel tube. The pre-compressed steel tube control stress is 0.5 times the nominal value of steel tube, the concrete pre-tensile stress can be obtained effectively by relaxes pre-compressed steel tube. This paper further optimizes the dosage of pre-tensile tendon (A p), pre-compressed steel tube (A T), tensile reinforcements (A s)and compression reinforcements (A' s). The results from example show that the concrete structure of tensile-compression prestressed can reduce the pressure area height of the beam effectively and solving conventional prestressed concrete structure excessive or cannot reinforcement in pressure area. © (2011) Trans Tech Publications.
Zhu S.,Hefei University of Technology |
Wang Y.,Hefei University |
Shi M.,Anhui University
IEEE Transactions on Information Theory | Year: 2010
In this paper, we investigate the structure and properties of cyclic codes over the ring F2+vF2. We first study the relationship between cyclic codes over F2+vF2 and binary cyclic codes. Then we prove that cyclic codes over the ring are principally generated, and give the generator polynomial of cyclic codes over the ring. Finally, we obtain the unique idempotent generators for cyclic codes of odd length and determine the number of cyclic codes for a given length ν over F2+vF 2. © 2006 IEEE.
Lin L.-L.,Shandong Normal University |
Lin L.-L.,KTH Royal Institute of Technology |
Wang C.-K.,Shandong Normal University |
Luo Y.,KTH Royal Institute of Technology |
Luo Y.,Hefei University
ACS Nano | Year: 2011
The gold-benzenedithiol-gold junction is the classic prototype of molecular electronics. However, even with the similar experimental setup, it has been difficult to reproduce the measured results because of the lack of basic information about the molecular confirmation inside the junction. We have performed systematic first principles study on the inelastic electron tunneling spectroscopy of this classic junction. By comparing the calculated spectra with four different experimental results, the most possible conformations of the molecule under different experimental conditions have been successfully determined. The relationship between the contact configuration and the resulted spectra is revealed. It demonstrates again that one should always combine the theoretical and experimental inelastic electron tunneling spectra to determine the molecular conformation in a junction. Our simulations have also suggested that in terms of the reproducibility and stability, the electromigrated nanogap technique is much better than the mechanically controllable break junction technique. © 2011 American Chemical Society.
Fang F.,Hefei University |
Li Y.,Hefei University |
Tian S.-K.,Hefei University
European Journal of Organic Chemistry | Year: 2011
An unprecedented protocol has been developed for thestereoselective synthesis of structurally diverse electron-deficient alkenes in moderate to excellent yields from readily accessible N-sulfonyl imines and stabilized phosphonium ylides. Significantly, the olefination reaction of N-sulfonylimines with nitrile-stabilized phosphonium ylides affords an array of α,β-unsaturated nitriles with high Z selectivity, and the reactions with ester-, amide-, and ketone-stabilized phosphonium ylides afford α,β-unsaturated esters, amides, and ketones with high E selectivity, respectively. Spectroscopic analysis of the reaction mixtures and trapping of the intermediates allow plausible mechanisms to be proposed. Initialimine/ylide addition leads to the formation of betaines that cyclize to form 1,2-azaphosphetanes that subsequently eliminate iminophosphoranes to yield alkenes. For the synthesis of electron-deficient 1,2-disubstituted alkenes, the presence of an electron-withdrawing group in the betaine allows rapid interconversion between its two diastereomers through proton transfer. The Z/E selectivity for alkene synthesis is determined by the different rates at which the two betaine diastereomers form the corresponding 1,2-azaphosphetane diastereomers. In contrast, the Z/E selectivity for the synthesis of electron-deficient trisubstituted alkenes originates from the diastereoselective addition of stabilized phosphonium ylides to N-sulfonyl imines. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.