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Hu, X.F.,Guo, Yuming,Huang, B.Y.,Zhang, L.B.,Bun, S.,Liu, D.,Long, F.Y.,Li, J.H.,Yang, X.,Jiao, P. Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.2
The effects of corticosterone (CORT) administration on the weight of small intestine and the expression of nutrient transporter mRNA in the small intestine of broiler chickens (Gallus gallus domesticus) were investigated. One hundred and eight sevenday-old birds were randomly divided into two equal groups comprising a control group (CTRL) and an experimental group (CORT). CTRL birds were fed a basal diet and the CORT birds were fed a basal diet containing 30 mg corticosterone/kg from d 8 to 21. At 21 d of age, average daily feed intake (ADFI), serum corticosterone level, small intestinal absolute wet weight and relative weight, and relative abundance of SGLT1, CaBP-D28k, PepT1 mRNA in the duodenum and L-FABP mRNA in the jejunum were determined. The results showed that serum corticosterone level, liver weight and small intestinal relative weight (small intestinal wet weight/body weight) of CORT chickens were about 30.15%, 26.72% and 42.20% higher, respectively, than in the CTRL group (p<0.05). CORT birds had relative mRNA abundance of CaBP-D28k and PepT1 in the duodenum, and L-FABP in the jejunum which was 1.77, 1.37 and 1.94 fold higher, respectively, than in the CTRL group (p<0.05); the relative abundance of SGLT1 was 1.67 fold higher than in the CTRL group (p = 0.097). ADFI, small intestinal wet weight and length in CORT-treated broiler chickens was about 29.11%, 31.12% and 12.35% lower, respectively, than in the CTRL group (p<0.05). In conclusion, corticosterone administration lowered the wet weight but increased the relative weight of the small intestine and the expression of intestinal nutrient transporter mRNA of broiler chickens.
Electronic properties of graphene on the C-decorated Si(111) surface:An ab initio study
J. Liu,C.Y. He,W. Wang,N. Jiao,C.X. Zhang,L.Z. Sun 한국물리학회 2013 Current Applied Physics Vol.13 No.7
First principles calculations based on the density functional theory are performed to study electronic structures of graphene adsorbed on clean or C-decorated Si(111) surface. Two types of surface reconstructions,2 x 2 and ffiffiffi 3p x 3p , are considered to be decorated by carbon atoms with different concentrations. We find that graphene adsorbed on ideal clean Si(111) surface tends to induce a 2 x 1reconstruction, and its electronic dispersion characteristics are preserved. Moreover, the decoration of carbon atoms on the Si(111) surface can effectively passivate the Si dangling bonds on the surface. Such decoration effects make the carbon deco
Y. Xu,J. S. Liu,Y. X. Jiao 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
In this paper, the constitutive model and dynamic recrystallization characteristics of 12Cr ultra-super-critical rotor steelwere investigated quantitatively during hot deformation. A series of axisymmetric hot compression tests at temperaturesfrom 900 to 1200 °C under strain rates of 0.001–1 s−1 were conducted on a Gleeble−1500D thermal simulator. Based on theexperimental true stress–strain curves varying with temperature and strain rates, a complete constitutive model was establishedand all material parameters in the model could be expressed as a function of strain using a fifth order polynomial fit. The proposed model was verified so as to have the capability of accurately predicting the flow behaviour with an averageabsolute relative error of < 2.82%. Meanwhile, after hot deformation the microstructure was observed via electron backscatterdiffraction technology. Then, the dependence of the characteristic parameters on the Zener–Hollomon parameter wereconfirmed. Furthermore, the kinetics equation of dynamic recrystallization was obtained, which included the flow stresscalculated based on the evolution equation of the dislocation density during the work hardening-dynamic recovery stage. The result indicated that the predicted values for dynamic recrystallization volume fraction and flow stress were in line withthe experimental values.
SWCNT growth on Al/Fe/Mo investigated by <i>in situ</i> mass spectroscopy
Kim, S-M,Zhang, Y,Teo, K B K,Bell, M S,Gangloff, L,Wang, X,Milne, W I,Wu, J,Jiao, J,Lee, S-B IOP Pub 2007 Nanotechnology Vol.18 No.18
<P>The effect of temperature on the growth of single-walled carbon nanotubes (SWCNTs) was investigated over the range of 725–900 °C. A cold-wall reactor consisting of a heated stage (on which the substrate for SWCNT growth (Al/Fe/Mo) was placed) and a showerhead (from which C<SUB>2</SUB>H<SUB>2</SUB> was introduced vertically into the reactor) was used for the growth. The heating was found to play two roles: (1) it generated complex hydrocarbon radicals during the growth process, as well as (2) promoting catalytic nanoparticles on the substrate during the annealing process. The optimum temperature for the highest SWCNT yield was found to be ∼860 °C. For the first time, <I>in situ</I> mass spectroscopy was used to identify the growth precursors generated from thermal pyrolysis of C<SUB>2</SUB>H<SUB>2</SUB> within this temperature range. The peak of the radicals found (C<SUB>6</SUB>H<SUB>9</SUB>, C<SUB>5</SUB>H<SUB>9</SUB> and C<SUB>6</SUB>H<SUB>13</SUB>) and the highest catalyst support particle density (Fe catalyst supported on Al<SUB><I>x</I></SUB>O<SUB><I>y</I></SUB>) was correlated to the maximum yield of single walled carbon nanotubes at the optimum growth temperature of ∼860 °C. Bottom gate SWCNT-FETs (single-walled carbon nanotube based field effect transistors) were fabricated showing a high transconductance of ∼0.12 µS and on/off ratio of ∼10<SUP>5</SUP> which are both comparable to other state-of-the-art SWCNT-FET. </P>
Insights into the removal of gaseous oxytetracycline by combined ozone and membrane biofilm reactor
Z.S. Wei,X.L. Chen,Z.S. Huang,H.Y. Jiao,X.L. Xiao 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.6
Gaseous emerging organic compounds (GEOCs) may harm human health and ecological environment. High temperature composting of livestock manure may produce oxytetracycline (OTC) waste gas. Here, we investigated treatment OTC in waste gas by combined ozone and membrane biofilm reactor (MBfR) with desulphurizing bacteria. The performance, the microbial community, gene function and the mechanism for OTC removal in the ozone-MBfR were evaluated. The ozone-MBfR system could achieve more degradation of OTC completely than MBfR. Desulfovibrio, Lentimicrobium, Aminivibrio, Thioalkalispira, Erysipelothrix, Mangroviflexus, Azoarcus, Thauera, Geobacter, Paracoccus, and Dethiosulfatibacter were the dominant genera. Pseudomonas, Escherichia, Bacteroides, Salmonella, Paracoccus, Stappia were contribution to OTC degradation. With the addition of ozone, the community diversity increased; some genera, such as Tenericutes- uncultured, and Desulfovibrio, increased in abundance, whereas others, such as Thauera, and Petrimonas, decreased. Ozone destroyed the enol structure in OTC molecular structure and produces biodegradable products, ozone oxidation was combined with biodegradation, to achieve thoroughly degrade OTC in waste gas. The novel hybrid ozone-MBfR is a cost-effective and robust alternative to GEOCs treatment.
P. Z. Si,X. L. Wang,X. F. Xiao,H. J. Chen,X. Y. Liu,L. Jiang,J. J. Liu,Z. W. Jiao,H. L. Ge 한국자기학회 2015 Journal of Magnetics Vol.20 No.3
Cr₂O₃ nanoparticles were prepared via one-step reactive laser ablation of Cr in oxygen. The metastable CrO₂ phase was obtained through the subsequent oxidation of Cr₂O₃ nanoparticles under O₂ with gas pressures of up to 40 MPa. The as-prepared Cr₂O₃ nanoparticles are spherical or rectangular in shape with sizes ranging from 20 nm to 50 nm. High oxygen pressure annealing is effective in producing meta-stable CrO₂ from as-dried Cr₂O₃ nanoparticles, and the Cr₂O₃ nanoparticles exhibit a weak ferromagnetic behavior with an exchange bias of up to 11 mT that can be ascribed to the interfacial exchange coupling between uncompensated surface spins and the antiferromagnetic core. The Cr₂O₃/CrO₂ nanoparticles exhibit an enhanced saturation magnetization and a reduced exchange bias with an increasing faction of CrO₂ due to the elimination of uncompensated surface spins over the Cr₂O₃ nanoparticles when exposed to a high pressure of O₂ and/or possible phase segregation that results in a smaller grain size for both Cr₂O₃ and CrO₂.