http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
ON MINUS TOTAL DOMINATION OF DIRECTED GRAPHS
Li, WenSheng,Xing, Huaming,Sohn, Moo Young Korean Mathematical Society 2014 대한수학회논문집 Vol.29 No.2
A three-valued function f defined on the vertices of a digraph D = (V, A), $f:V{\rightarrow}\{-1,0,+1\}$ is a minus total dominating function(MTDF) if $f(N^-(v)){\geq}1$ for each vertex $v{\in}V$. The minus total domination number of a digraph D equals the minimum weight of an MTDF of D. In this paper, we discuss some properties of the minus total domination number and obtain a few lower bounds of the minus total domination number on a digraph D.
Electrospun Ag‑Doped SnO2 Hollow Nanofbers with High Antibacterial Activity
Li Yang,Gao Songwei,Zhang Bin,Mao Huaming,Tang Xiaoning 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.3
With the continuous improvement in medical science in modern times, the spread of bacterial infection has become a matterof global concern. Therefore, the search for biological medical materials with antibacterial function has become a focusof intense research. In this work, pure SnO2 and Ag-doped SnO2 hollow nanofbers were fabricated by a combination of anelectrospinning method and a calcination procedure, and the Effects of the doped Ag on antibacterial activity and catalyticantibacterial activity were subsequently investigated. Through the process of high-temperature calcination, a high heatingrate would lead to the formation of a hollow tubular structure in SnO2 fbers, and Ag2O would be reduced to Ag0by a facileprocess with appropriate thermal treatment. Additionally, the existence of SnO2 as a tetragonal rutile structure was confrmed. On the basis of pure SnO2, doping with Ag greatly improved the antibacterial activity and catalytic antibacterial activity ofhollow nanofbers. The formation mechanism and the antibacterial mechanism of pure SnO2 and Ag-doped hollow nanofbersare also discussed. This study has broad application prospects for biological medicine.
XIAOYU LI,HUAMING YANG,LIANGJIE FU,TIANCHENG LIU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.4
Nickel oxide (NiO) nanoparticles were synthesized by calcination at 400?C to 700?C for 8 h of theprecursor obtained via mechanochemical reaction of Ni(NO 3 ) 2 ? 6 H 2 O with citric acid as a dis-persant. The nanoparticles were characterized by thermogravimetric-diferential scanningcalorimetry (TG-DSC), X-ray difraction (XRD) and transmission electron microscopy (TEM). The kinetics of diferent surfaces of the nanocrystals under nonisothermal conditions wasinvestigated. The activation energies for diferent lattice planes of NiO nanoparticles weredetermined using the Arrhenius equation, revealing their preferred orientation. The growth ofNiO obeyed the general theory that nanoparticles with the largest surface energy tend to form. XRD data reveal that the NiO nanoparticles possess preferred (111) or (200) orientations thatre°ect their complex activity. The nature of preferred growth orientation was found to benegative difusion activity among diferent lattice surfaces, which indicates that oxygen atomsdi®use from low oxygen concentration on the lattice surface to high concentration on the latticesurface.
Chengtang Liu,Huaming Li,Hui Xu,Ling Liu,Li Xu,Zhixiang Ye 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.4
Na_8Nb_6O_19.13H_2O particles were synthesized by a simple hydrothermal method. The catalysts were characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM) and thermogravimetric and differential scanning (TG-DSC). The XRD and TG-DSC analyses indicated that Na_8Nb_6O_19.13H-2O was an intermediate hexaniobate during the preparation of NaNbO_3 powders. Methylene blue (MB) dye degradation using Na_8Nb_6O_19.13H_2O/H_2O_2,Nb_2O_5/H_2O_2 and NaNbO_3/H_2O_2 systems were investigated, respectively. Among the catalytic oxidation systems, Na_8Nb_6O_19·13H_2O showed the highest activity for degradation of MB in the presence of H_2O_2. The results indicated that the dye degradation efficiency could be 93.5% at 30 ℃ after 60 min in the presence of the Na_8Nb_6O_19·13H_2O/H_2O-2 system. It was also found that the degradation of MB over the catalytic systems followed pseudo-first-order kinetics, and the degradation rate was 0.02376 min−1 in the Na_8Nb_6O_19.13H_2O/H_2O_2 system, which was higher than that in the Nb_2O_5/H_2O_2and NaNbO_3/H_2O_2 systems. A possible mechanism for MB catalytic oxidation degradation using the Na_8Nb_6O_19.13H-2O/H_2O_2 system was proposed.
Wenshuai Zhu,Huaming Li,Yehai Xu,Bilian Dai,Hui Xu,Chao Wang,Yanhong Chao,Hui Liu 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.2
Three types of TiO2 were synthesized by a hydrolysis and calcination method. The catalysts were characterizedby X-ray powder diffraction (XRD), diffuse reflectance spectrum (DRS), Raman spectra, and X-ray photoelectronspectroscopy (XPS). The XRD and Raman spectra indicated that amorphous TiO2 was successfully obtained at100 oC. The results indicated that amorphous TiO2 achieved the highest efficiency of desulfurization. The photocatalyticoxidation of dibenzothiophene (DBT), benzothiophene (BT), 4,6-dimethyldibenzothiophene (4,6-DMDBT) anddodecanethiol (RSH) in model oil was studied at room temperature (30 oC) with three catalysts. The system containedamorphous TiO2, H2O2, and [Bmim]BF4 ionic liquid, ultraviolet (UV), which played vitally important roles in the photocatalyticoxidative desulfurization. Especially, the molar ratio of H2O2 and sulfur (O/S) was only 2 : 1, which correspondedto the stoichiometric reaction. The sulfur removal of DBT-containing model oil with amorphous TiO2 couldreach 96.6%, which was apparently superior to a system with anatase TiO2 (23.6%) or with anatase - rutile TiO2 (18.2%). The system could be recycled seven times without a signicant decrease in photocatalytic activity.
Effects of surface materials of self-draining beds on cattle behavior in a temperate climate
Liu Ping,Guo Lulu,Zhang Fulan,Li Lin,Mao Huaming,Gu Zhaobing 아세아·태평양축산학회 2020 Animal Bioscience Vol.33 No.11
Objective: The objective of the present experiment was to construct self-draining beds to keep surface bedding materials clean and dry for beef cattle comfort in a temperate climate. Methods: In Experiment 1, a self-draining bed was covered with sand at depths of 10 cm (S-10a), 15 cm (S-15), and 20 cm (S-20) respectively. In Experiment 2, self-draining beds of different sizes were covered with 10 cm of sand (S-10b) and wood shavings (WS) at depths of 15 cm and 20 cm (WS-15 and WS-20). Fifteen cattle were engaged to evaluate the comfort of self-draining beds covered with different bedding materials. Results: No cattle lay in the feed alley and cattle spent more time lying on S-10a than S-15 or S-20 in Experiment 1 (p<0.01). No difference in lying time was detected between S-15 and S-20 (p>0.05). In Experiment 2, no cattle selected the feed alley as the lying area. Cattle preferred WS-15 as the lying area and time spent lying on WS-20 was slightly higher than on S-10b (p<0.05). Feces weight was higher in the feed alley than in the different bedding areas in both Experiments 1 and 2 (p<0.01). Conclusion: Sand-bedding depth at 10 cm and WSs at 15 cm above the self-draining bed can provide for the lying comfort of beef cattle. Design of a special feed alley to hold most of the feces to keep bedding materials clean and dry is desirable for organic beef cattle in a loose barn.
Lu, Qiongfen,Chen, Peifu,Chai, Yan,Li, Qihua,Mao, Huaming Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.1
Objective: This study aims to evaluate the effects of dietary supplement of rubber seed oil on production performance, egg quality, and yolk fatty acid composition in laying hens during a 16-week feeding trial period. Methods: Forty-eight 25-week-old laying hens of Hy-Line Brown were randomly divided into three groups. Each group comprised four replicates and each replicate had four birds. Rubber seed oil was incorporated into a corn-soybean meal basal diet by 3.5% (group I), 4.5% (group II), or 0 (control group) and equivalent nutrition was supplied for the test groups and the control group. The performance related values were determined using standard or well established methods. Results: No significant difference was found in the production performance, the egg quality, the composition of saturated fatty acids, and the content of cholesterol and monounsaturated fatty acids in the yolk within the three groups. Interestingly, both test groups achieved a significantly higher content of linoleic acid, α-linolenic acid, eicosapentaenoic acid, and docosahexaenoic acid and a significantly lower content of arachidonic acid (p<0.05) compared with the control group. With the increased level of dietary rubber seed oil, there was an increasing trend in the content of n-6 polyunsaturated fatty acids (PUFA), n-3 PUFA and total PUFA, but a declining trend in the n-6/n-3 ratio. Conclusion: These results demonstrate that the rubber seed oil supplemented diet effectively improved the total PUFA content in eggs without impairing the layers' production performance and the egg quality.
Yu Cao,Zhihui Fang,Duanguang Yang,Yong Gao,Huaming Li 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.2
We reported a sensitive voltammetric sensor for Sudan I determination by modifying glassy carbon electrode (GCE) with single-walled carbon nanotubes (SWCNTs)/β-cyclodextrin conjugate. The cyclic voltammetry results showed that the modified GCE exhibited strong catalytic activity toward the electro-reduction of Sudan I with a well-defined cyclic voltammetric peak at -673 mV. Differential pulse voltammetry measurement showed that the response current exhibited a linear range between 50 nM and 5 µM, and the detection limit was as low as 2.22 nM (S/N=3). The enhanced electrochemical performance of the fabricated sensor was attributed to the combination of the excellent electrocatalytic properties of SWCNTs and the molecular recognition ability of β-cyclodextrin to Sudan I. The sensor was successfully applied to determine Sudan I in real food samples with satisfactory results.
Jun Xiong,Jing Luo,Lei Yang,Jingyu Pang,Wenshuai Zhu,Huaming Li 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
Boron defect engineered boron nitride (BN) nanosheets have been prepared with the barbituric acid as co-reactant sources. By virtue of B defects, the electronic structure of BN undergo significantly variation, in which the conduction band of BN declined from −1.35 to −0.54 eV and decreased chemical acid hardness. After B defect engineering, BN nanosheets display greatly improved adsorptive desulfurization performance towards dibenzothiophene (DBT), with optimized adsorption capacity of 43.6 mgS g−1 for model oil. The increased adsorptive desulfurization performance was derived from decreased chemical acid hardness by B defect engineering, thus can build preferable interplay between the soft base DBT.