关键词:
Tourism litter management;The theory of planned behavior;Incentive measures;Travel companions;Pro-environmental behaviors
摘要:
Bringing self-generated litter down the mountain is an emerging pro-environmental behavior to solve the problem of trail's litter management in China. This study is the first attempt to explore a theoretical explanation model that explicates tourists' complex intention-forming process for engaging in it. The study extended the Theory of Planned Behavior model, including three additional explaining variables (environmental theory knowledge, environmental practice knowledge, and incentive measures), as well as a moderator of travel companions between subjective norm and the behavioral intention. The data were collected in questionnaire survey samples of 372 tourists in Huangshan National Park (HNP) and analyzed by the method of the structural equation model. The results showed that (1) attitude toward the behavior, subjective norm, perceived behavioral control and incentive measures significantly affected the behavioral intention; (2) environmental theory knowledge and environmental practice knowledge had indirect effects on the behavioral intention via the mediator of attitude toward the behavior; and (3) the strength of the relationship for the family group between subjective norm and the behavioral intention was significantly greater than the non-family group. Finally, we presented several effective suggestions to improve tourists' intention of bringing self-generated litter down the mountain. (C) 2018 Elsevier Ltd. All rights reserved.
通讯机构:
[Peng, Xiaojiang] H;Hengyang Normal Univ, Hengyang 421008, Peoples R China.
关键词:
Face recognition;deep learning;small training data
摘要:
Deep convolutional neural networks have recently proven extremely effective for difficult face recognition problems in uncontrolled settings. To train such networks, very large training sets are needed with millions of labeled images. For some applications, such as near-infrared (NIR) face recognition, such large training data sets are not publicly available and difficult to collect. In this paper, we propose a method to generate very large training data sets of synthetic images by compositing real face images in a given data set. We show that this method enables to learn models from as few as 10 000 training images, which perform on par with models trained from 500 000 images. Using our approach, we also obtain state-of-the-art results on the CASIA NIR-VIS2.0 heterogeneous face recognition data set.
摘要:
By applying contraction mapping theorem and Gronwall's inequality on time scale, we establish some sufficient conditions on the existence and global exponential stability of periodic solutions for a kind of stochastic fuzzy cellular neural networks on time scales. Moreover an example is presented to illustrate the feasibility of our results obtained.
摘要:
Amine-modified magnetite (NH(2)-Fe(3)O(4))/reduced graphene oxide nanocomposite modified glassy carbon electrodes (NH(2)-Fe(3)O(4)/RGO/GCEs) were developed for the sensitive detection of dopamine (DA). The NH(2)-Fe(3)O(4)/RGO/GCEs were fabricated using a drop-casting method followed by an electrochemical reduction process. The surface morphologies, microstructure and chemical compositions of the NH(2)-Fe(3)O(4) nanoparticles (NPs), reduced graphene oxide (RGO) sheets and NH(2)-Fe(3)O(4)/RGO nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-Ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectroscopy. The electrochemical behaviors of DA on the bare and modified GCEs were investigated in phosphate buffer solution (PBS) by cyclic voltammetry (CV). Compared with bare electrode and RGO/GCE, the oxidation peak current (ipa) on the NH(2)-Fe(3)O(4)/RGO/GCE increase significantly, owing to the synergistic effect between NH(2)-Fe(3)O(4) NPs and RGO sheets. The oxidation peak currents (ipa) increase linearly with the concentrations of DA in the range of 1 x 10(-8) mol/L - 1 x 10(-7) mol/L, 1 x 10(-7) mol/L - 1 x 10(-6) mol/L and 1 x 10(-6) mol/L - 1 x 10(-5) mol/L. The detection limit is (4.0 +/- 0.36) x10(-9) mol/L (S/N = 3). Moreover, the response peak currents of DA were hardly interfered with the coexistence of ascorbic acid (AA) and uric acid (UA). The proposed NH(2)-Fe(3)O(4)/RGO/GCE is successfully applied to the detection of dopamine hydrochloride injections with satisfactory results. Together with low cost, facile operation, good selectivity and high sensitivity, the NH(2)-Fe(3)O(4)/RGO/GCEs have tremendous prospects for the detection of DA in various real samples.
摘要:
Although a lot of theoretical studies have designed perfect spin filters using inorganic/organic/organometallic materials, their fabrication methods are not experimentally feasible. This dilemma could be solved by a recent experiment, where porphyrins have been covalently coupled to graphene edges in a precise manner (Y. He et al., Nat. Chem., 2017, 9, 33-38). In particular, experimental results confirmed that the intrinsic features of porphyrins for metallation are preserved after dehydrogenative coupling to graphene edges, paving the way for realizing synthesizable spintronic devices. Inspired by this work, we report new M-porphyrin/graphene (M = Cr, Mn, Fe, and Co) hybrid systems with tunable functionalities on the basis of nonequilibrium Green's functions in combination with density functional theory. The Mn-porphyrin/graphene hybrid system exhibits an extremely high spin polarization coefficient in a parallel magnetic configuration. Our results also confirm that the magnetic configuration plays an important role in realizing a high-performance spin filter. The interesting spin transport properties in the parallel and antiparallel magnetic configurations also make the hybrid system a suitable candidate for realizing the AND logic operation.
作者机构:
[Tang, Fanggui] Hengyang Normal Univ, Coll Educ Sci, Hengyang 421002, Hunan, Peoples R China.
通讯机构:
[Tang, Fanggui] H;Hengyang Normal Univ, Coll Educ Sci, Hengyang 421002, Hunan, Peoples R China.
关键词:
Fuzzy clustering algorithm;College students;Modeling and simulation
摘要:
The rational modeling of College Students' mental health quality can make an accurate analysis of College Students' mental state and provide theoretical basis for eliminating college students' psychology. It was researched on College Students' psychological health quality optimization modeling and simulation. First it elaborated the fuzzy clustering algorithm. Then the algorithm model of College Students' psychological principle based on information system. Finally the algorithm was tested on the experiment and simulation. Synthetic data sets and gets the conclusion: this algorithm has obtained better clustering effect and it also confirms the effectiveness of multi view clustering technique, the simulation results show that the proposed model provides a strong basis for the promotion of College Students' mental health.
作者:
Li Wei;Li Yu-Lin*;Li Chang-Hong*;Tan Xiong-Wen
期刊:
Chinese Journal of Structural Chemistry,2018年37(5):819-824 ISSN:0254-5861
通讯作者:
Li Yu-Lin;Li Chang-Hong
作者机构:
[Tan Xiong-Wen; Li Yu-Lin; Li Wei] Hengyang Normal Univ, Sch Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;[Li Chang-Hong] Hunan Inst Technol, Sch Chem Engn, Hengyang 421002, Hunan, Peoples R China.;[Li Wei] Key Lab Funct Met Organ Cpds Hunan Prov Hengyang, Hengyang 421008, Hunan, Peoples R China.
通讯机构:
[Li Yu-Lin; Li Chang-Hong] H;Hengyang Normal Univ, Sch Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;Hunan Inst Technol, Sch Chem Engn, Hengyang 421002, Hunan, Peoples R China.
关键词:
binuclear copper(II) complex;thermal stability;electrochemical and magnetic properties
摘要:
A new binuclear copper(II) complex [Cu_2(Hpt)_2(TNCA)_2(H_2O)_2]·4H_2O (1) has been synthesized with copper acetate, 5-oxo-4-oxa-tricyclo[4.2.1.0]nonane-9-carboxylic acid (TNCA) and 3-(pyridin-2-yl)-1,2,4-triazole (Hpt). It crystallizes in the triclinic space group P1, with a = 8.8199(18), b = 14.278(3), c = 15.269(3) A, α = 76.21(3)º, β = 81.07(3)º, γ = 76.07(3)º, V = 1802.7(6) A~3, D_c = 1.636 g/cm~3, Z = 2, F(000) = 916, the final GOOF = 1.051, R = 0.0556 and wR = 0.1388. The whole molecule consists of two copper ions bridged by two μ2-η1:η0-3-(pyridin-2-yl)-1,2,4-triazole anions. The coordination environment of the Cu(1) ion is CuO_2N_3, giving a distorted square pyramidal geometry. 1 exhibits antiferromagnetic interaction between Cu(II) ions, the electron transfer of 1 is irreversible in electrode reactions and the TG analysis shows that 1 is stable below 440 K.
期刊:
Chinese Journal of Structural Chemistry,2018年37(2):270-276 ISSN:0254-5861
通讯作者:
Zhang Fu-Xing
作者机构:
[Jiang Wu-Jiu; Wu Qian; Kuang Dai-Zhi; Zhang Fu-Xing; Yu Jiang-Xi; Zhu Xiao-Ming] Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Key Lab Funct Organometall Mat, Dept Chem & Mat Sci,Coll Hunan Prov, Hengyang 421008, Hunan, Peoples R China.
通讯机构:
[Zhang Fu-Xing] H;Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Key Lab Funct Organometall Mat, Dept Chem & Mat Sci,Coll Hunan Prov, Hengyang 421008, Hunan, Peoples R China.
关键词:
triphenyltin complex with salicylidene-2-aminophenol;organotin;synthesis
摘要:
The triphenyltin complex with salicylidene-2-aminophenol (C_(31)H_(24)NO_2Sn, 1) has been synthesized and characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, and X-ray single-crystal diffraction. The complex crystallizes in monoclinic system, P2_1/c space group with a = 1.09515(8), b = 1.17739(8), c = 2.29075(14) nm, β = 117.070(4)°, V = 2.6302(3) nm~3, Z = 4, D_c = 1.417 g/cm~3, μ = 0.999 mm~(-1), F(000) = 1123, R = 0.0472 and wR = 0.1169. X-ray single-crystal diffraction showed that 1 demonstrates a one-dimensional chain structure. The quantum chemical calculation of 1 has been investigated. Complex 1 emits fluorescence at 558 nm and exhibits certain inhibitory activity against NCI-H460, A549 and MCF-7.
摘要:
A new binuclear nickel(II)complex[Ni_2(C_7N_4H_5)_3(C_9H_9O_2)]_n has been hydrothermally synthesized with nickel sulfate, 3-(pyridin-2-yl)-1H-1,2,4-triazole and 3,5-dimethylbenzoic acid (3,5-DMBA). It crystallizes in the triclinic space group P1with a = 11.5769(7), b = 12.3115(7), c = 12.6431(7)A, α = 81.4860(10)º, β = 64.2830(10)º, γ = 63.7130(10)º, V = 1453.45(15)A_3, Dc = 1.604 g/cm~3, Z = 2, F(000)= 720, the final GOOF = 1.048, R = 0.0285 and wR = 0.0628. The crystal structure shows that the whole molecule consists of two nickel ions bridged by three μ_2-η_1:η_0-3-(pyridin-2-yl)-1,2,4-triazole anions. The coordination environment of Ni(II)ion is NiO_2N_4 and NiN_5, giving a distorted octahedral geometry and square pyramidal geometry respectively. The luminescence and thermal properties of the complex were investigated.