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Baicheng, China

Dong H.,Harbin Institute of Technology | Dong H.,Baicheng Normal College | Chen G.,Harbin Institute of Technology | Sun J.,Harbin Institute of Technology | And 3 more authors.
Applied Catalysis B: Environmental

A novel high-efficiency visible-light sensitive Ag2CO3 semiconductor photocatalyst was prepared by a simple ion-exchange method based on a strategy incorporating of p-block C element into a narrow bandgap Ag2O. This photocatalyst exhibits universal high-efficient degradation ability for typically several RhB, MO and MB dyes. Getting insight into degradation patterns of dyes over Ag2CO3 identifies they are self-oxidation behavior of semiconductor rather than the effect of photosensitization. The reaction mechanism investigated by a series of radical trapping experiments, not only ascertains the major photoreaction approaches of dyes on the surface of Ag2CO3, but also reveals the unique universality advantage that arises from selective using one of many activated species to decompose many kinds of dyes such as RhB, MO and MB. The theoretical calculation based on first-principles provides inherently essential evidences for high-efficient oxidation performance of Ag2CO3 photocatalyst. © 2013 Elsevier B.V. Source

Zhang Z.,Baicheng Normal College | Zhang Z.,Jilin University
Inorganic Chemistry Communications

Silver atoms and strongly interlinking α-metatungstate units ensure the 3D structure of (NH 4) 5[Ag 5(L) 2(H 2O) 8(H 2W 12O 40)]•H 2O (L = pyridine-3,5-dicarboxylate dianion), which has been synthesized in aqueous solution and characterized by the normal physical methods as well as the single-crystal X-ray diffraction. This compound represents the first example that the α-metatungstate cluster as the structural motif is linked by transition metal complexes to yield unprecedented 3D framework with the highest eleven-connected number. © 2011 Elsevier B.V. All rights reserved. Source

Li B.,Baicheng Normal College
Advanced Materials Research

SEMG detection system is of great significance in clinical diagnosis, rehabilitation engineering, sports medicine and the bionic man-machine systems as a noninvasive detection method. EMG detection system mainly researches and designs for the SEMG signal acquisition, conditioning and treatment. The system which is composed of SEMG signal acquisition module, the system processing module and stimulator module has the function of detection spontaneous and evoking EMG, and processing and analyzing the extracted eigenvalue by using the methods of time domain analysis and frequency domain analysis. This paper designs the ARM core detection system, and processes the collected signal by combing analog filters and digital filters in order to achieve suppression of noise and interference, so as to obtain the effective SEMG. ARM processor reduces power consumption and improves the system performance and reliability. The results of experiments show that the system can extract the spontaneous EMG of the effective range, has the function of detection evoked EMG. © (2012) Trans Tech Publications. Source

Three novel 1:2 composite compounds prepared with the isopolyanions and lanthanide-organic units, (NH4)2{[Ln2(HL)2(H2O)9][(H2W12O40)]}·nH2O (Ln = Gd3+ (1), Tb3+ (2), n = 15; Ho3+ (3), n = 10; L = pyridine-3,5-dicarboxylate) were synthesized at room temperature and characterized by routine methods. X-ray structural analysis reveals that these structures are isomorphic: two crystallographically independent Ln3+ ions (Ln1 and Ln2) locate in different coordination environments; two ligands plays dissimilar coordination mode; the isopolyanion cluster acts as a tridentate ligand and connects three Ln3+ ions (Ln1, Ln1′ and Ln2) forming an unusual 2D undee-layer. The room temperature luminescent of 2 has been studied and exhibits a Tb3+ characteristic emission in the range of 450-650 nm. © 2011 Springer Science+Business Media, LLC. Source

A new Pb(II) coordination polymer, [Pb(1,4-chdc)(L)]n·nH2O (1), was synthesized under hydrothermal condition (1,4-H2chdc = 1,4-cyclohexanedicarboxylic acid and L = 2-(3-fluorophenyl)- 1H-imidazo[4,5-f][1,10]phenanthroline). Its crystal structure was determined by singlecrystal X-ray diffraction. Compound 1 crystallizes in triclinic, space group P1 with a = 9.1182(8), b = 11.3249(10), c = 12.7326(12) Å, α = 77.897(2), β = 81.644(2), γ = 84.491(2)o, V = 1269.0(2) Å3, Z = 2, C27H24FN4O5Pb, Mr = 710.69, Dc = 1.860 g/cm3, F(000) = 690, μ(MoKa) = 6.701 mm-1, R = 0.0349 and wR = 0.0746. In 1, each 1,4-chdc anion bridges two neighboring Pb(II) atoms in a bidentate chelating coordination mode to give a chain structure. The L ligands are attached on one side of the chain through chelating the Pb(II) atoms, and are stacked with those of an adjacent chain through π-π interactions, yielding a layer structure. The O-H⋯O and N-H⋯O hydrogen bonding interactions further stabilize the supramolecular layer structure of 1. Moreover, solid state luminescent property of 1 was also studied. © Copyright 2016 Editorial Board of Chinese Journal of Structurnal Chemistry. Source

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