Qiqihar University is an institution for higher education, founded in 1953 and located in Qiqihar city of Heilongjiang province in northeast China. Its campus has an area of 1.15 km². It is the only provincial, comprehensive, regular institution of higher learning in the western part of Heilongjiang Province. It is located beside Labor Lake in the city of Qiqihar. Covering an area of 1.25 square kilometers with a building area of 720,000 square meters, it is nicknamed 'The Round Lake University' and has been awarded titles such as 'Garden University' and 'Provincial Model Unit' by the Heilongjiang Provincial Committee of the CPC and the People's Government of Heilongjiang Province. Wikipedia.
Yan X.,Qiqihar University
Nuclear Engineering and Design | Year: 2016
The concentrations of thorium (232Th) in soil from a uranium mill tailings repository in South China were analyzed. The results showed that all the soil samples were acidic and the concentrations of 232Th in all the soil samples were more than the natural radionuclide content in soil of China. Through the field investigation, twelve kinds of dominant plants were discovered. The total quantity of 232Th in the whole plant is highest in rice flat sedge. We also found that Miscanthus floridulus has the greatest transfer factor (TF) for 232Th, rice flat sedge has the greatest bioconcentration factor (BF) for 232Th. At the mean time, M. floridulus has the greatest phytoremediation factor (PF) for 232Th. On the basis of the above conclusions and the definition for hyperaccumulator, rice flat sedge and M. floridulus could be the candidates of phytoremediation for radionuclide 232Th in the soil. © 2016 Elsevier B.V. All rights reserved.
Qian X.,East China University of Science and Technology |
Xiao Y.,Dalian University of Technology |
Xu Y.,East China University of Science and Technology |
Guo X.,Qiqihar University |
And 2 more authors.
Chemical Communications | Year: 2010
In this feature article, we report our recent progresses in fluorescent sensors of biological dyes from the viewpoint of supramolecular and bioorganic chemistry. For signalling fluorophores, we extended or created naphthalene-based ICT systems, e.g. amino-1,8-naphthalimides, amino-1,8-dicyanonaphthalenes and acenaphthopyrrol-9-carbonitriles. We also developed BODIPY derivatives with large Stokes shifts and high fluorescence quantum yields in polar solvents, and a rhodamine analogue working in strong competitive aqueous solution as well as its silaanthracene analogue with a bathochromic shift as large as 90 nm. For sensing mechanisms, we extended or developed the following methods to improve sensing: e.g. PET in a photogenerated electronic field, TICT promoted PET derived from aminoalkyl or piperazino aminonaphthalimides, and the translation/amplification effect of surfactant micelles or aggregation on fluorescent sensing. We also successfully designed deprotonation strengthened ICT, FRET-chemodosimeter sensing systems. For non-cyclic recognition receptors, naphthalimides with two or more side chains at their 4,5- or 3,4-positions, as a convenient and simple platform for ratiometric sensors, were created for the recognition of heavy and transition metallic cations; multi-armed polyamides with more side chains were innovated as a versatile platform for the sensing of metal ions with high affinity, selectivity and positive homotropic allosteric effects. We designed V-shape sensors of the bis(aminomethyl)pyridine receptor with two fluorophores to show high performance. Finally, the intracellular applications of the above sensors and dyes, e.g. imaging heavy and transition metal ions in cells, fluorescent marking of hypoxia of tumour cells, are also reviewed. © 2010 The Royal Society of Chemistry.
Di K.,Qiqihar University
Acta Crystallographica Section E: Structure Reports Online | Year: 2010
In the title compound, C11H12N2O 2·C7H5NO4·C 2H6O, the (2S*)-2-amino-3-(1H-indol-3-yl)propionic acid is present in the zwitterionic form. In the crystal structure, 2-amino-3-(1H-indol-3-yl)propionic acid molecules and pyridine-2,4-dicarb-oxylic acid molecules are linked through strong intermolecular O - H⋯O and N - H⋯O hydrogen bonds, forming layers parallel to (100). The layers are linked through the ethanol molecules via somewhat weaker intermolecular O - H⋯O and N - H⋯O hydrogen bonds, forming thus a three-dimensional network. Weak C - H⋯O and N - H⋯N hydrogen bonding and π-π interactions between the aromatic rings are also present. © 2010.
Hu J.,Harbin University of Science and Technology |
Hu J.,University of Kaiserslautern |
Chen D.,Harbin University of Science and Technology |
Du J.,Qiqihar University
International Journal of General Systems | Year: 2014
In this paper, the state estimation problem is investigated for a class of discrete nonlinear systems with randomly occurring uncertainties and distributed sensor delays. The norm-bounded uncertainties enter into the system in a randomly way, and such randomly occurring uncertainties (ROUs) obey certain Bernoulli distributed white noise sequence with known conditional probability. By constructing a new Lyapunov-Krasovskii functional, sufficient conditions are proposed to guarantee the convergence of the estimation error for all discrete time-varying delays, ROUs and distributed sensor delays. Subsequently, the explicit form of the estimator parameter is derived by solving two linear matrix inequalities (LMIs) which can be easily tested by using standard numerical software. Finally, a simulation example is given to illustrate the feasibility and effectiveness of the proposed estimation scheme. © 2014 © 2014 Taylor & Francis.
Zhang W.-G.,Qiqihar University
Acta Crystallographica Section E: Structure Reports Online | Year: 2011
The title hydrazone compound, C14H10ClFN 2O, adopts an E configuration about the C=N double bond. The dihedral angle between the two substituted benzene rings is 11.6 (2)°. The F atom is disordered over two sites with occupancies of 0.488 (2) and 0.512 (2). In the crystal, molecules are linked through intermolecular N - H⋯O hydrogen bonds, forming chains along the a axis. C - H⋯F and C - H⋯O interactions also occur.