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Nanoparticle additions for enhanced flux pinning in YBCO HTS films
N.M. Strickland,N.J. Long,E.F. Talantsev,P. Hoefakker,J.A. Xia,M.W. Rupich,W. Zhang,X. Li,T. Kodenkandath,Y. Huang 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
We describe a method for forming a nanoparticle dispersion in YBa₂Cu₃O7 superconducting lms grown by metal-organic depositionon RABiTS substrates. Two separate precursor modications have been shown by transmission electron microscopy to give nanopar-ticles of (Y,Dy)₂O₃ and BaZrO₃ with size distributions of 10-50 nm and 10-25 nm, respectively and that are well dispersed in the lm.These particles are eective ux pinning centers and enhance the transport critical current by up to 100% at 77 K for a magnetic eld of 1.5 T applied perpendicular to the tape. The processing required to grow these lms is not greatly altered from that of unmodied YBCO and can be readily transferred to continuous processing of long-length wires.
Pan, L.,Zhao, P.F.,Yang, Z.Y.,Long, S.F.,Wang, H.L.,Tian, Q.Y.,Xu, Y.T.,Xu, X.,Zhang, Z.H.,Piao, X.S. Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.12
Two experiments were conducted to evaluate effects of coated compound proteases (CC protease) on apparent total tract digestibility (ATTD) of nitrogen (N) and energy, and apparent ileal digestibility (AID) of amino acids (AA) and nutrients in diets for pigs. In Exp. 1, 12 crossbred barrows (initial body weight: $20.79{\pm}1.94kg$) were housed in individual metabolism crates and allotted into 2 treatments with 6 piglets per treatment according to weight in a randomized complete block design. The 2 diets were corn-soybean meal basal diets with (0.2 g/kg) or without CC protease supplementation. The CC protease supplementation increased (p<0.05) the digestible and metabolizable N and energy values and the digestibility and retention rate of N in the diet. The ATTD of energy and nutrients had been improved (p<0.05) in the diet supplemented with CC protease. In Exp. 2, 12 crossbred barrows (initial body weight: $20.79{\pm}1.94kg$), fitted with T-cannulas at the distal ileum, were blocked by body weight into 2 groups with 6 pigs each. The diets were the same as those in Exp. 1. The CC protease increased (p<0.05) the AID of crude protein and some essential AA including arginine, isoleucine and leucine. The AID and ATTD of energy and nutrients had been improved (p<0.05) by supplemental CC protease, but the hindgut digestibility of nutrients was unaffected. Overall, the CC protease improved the ATTD of N and energy and AID of some indispensible AA and nutrients in the corn-soybean meal diet for pigs. Therefore, the CC protease supplement could improve the utilization of protein in the corn-soybean meal diet and thus contribute to lower N excretion to the environment.
Phan, The-Long,Ho, T.A.,Thang, P.D.,Tran, Q.T.,Thanh, T.D.,Phuc, N.X.,Phan, M.H.,Huy, B.T.,Yu, S.C. Elsevier 2014 JOURNAL OF ALLOYS AND COMPOUNDS Vol.615 No.-
<P><B>Abstract</B></P> <P>We have determined the values of critical exponents of two polycrystalline samples (Nd<SUB>1−</SUB> <I> <SUB>x</SUB> </I>Y<I> <SUB>x</SUB> </I>)<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB> (<I>x </I>=0 and 0.07) from the magnetization data versus temperature and magnetic field, <I>M</I>(<I>H</I>, <I>T</I>), to learn about their magnetic and magnetocaloric (MC) properties. The results reveal the samples exhibiting the crossover of first-order and second-order phase transitions, where the exponent values <I>β </I>=0.271 and <I>γ </I>=0.922 for <I>x </I>=0, and <I>β </I>=0.234–0.236 and <I>γ </I>=1.044–1.063 for <I>x </I>=0.07 determined by using modified Arrott plots and static-scaling hypothesis are close to those expected for the tricritical mean-field theory (<I>β </I>=0.25 and <I>γ </I>=1.0). Particularly, the <I>T</I> <SUB>C</SUB> of <I>x </I>=0 and 0.07 can be any value in the temperature ranges of 240–255K and 170–278K, respectively, depending on the magnitude of applied magnetic field and determination techniques. Around the <I>T</I> <SUB>C</SUB>, studying the MC effect of the samples has revealed a large magnetic-entropy change (Δ<I>S</I> <SUB>m</SUB>) up to ∼8J/kgK for the applied field interval Δ<I>H </I>=50kOe, corresponding to refrigerant capacity values of 200–245J/kg. These phenomena are related to the crossover nature and the persisting of FM/anti-FM interactions even above the <I>T</I> <SUB>C</SUB>, as further confirmed by electron-spin-resonance data, Curie–Weiss law-based analyses, and an exponential parameter characteristic of magnetic order <I>n </I>=dLn|Δ<I>S</I> <SUB>m</SUB>|/dLn<I>H</I>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Tricritical point in Y-doped Nd<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB> manganites. </LI> <LI> A large magnetic-entropy change. </LI> <LI> Magnetic inhomogeneity and phase separation. </LI> </UL> </P>
Long, D.X.,Xu, Y.,Kang, S.J.,Park, W.T.,Choi, E.Y.,Nah, Y.C.,Liu, C.,Noh, Y.Y. Elsevier Science 2015 ORGANIC ELECTRONICS Vol.17 No.-
We report on high-performance organic field-effect transistors (OFETs) with low-cost Mo source/drain electrode by incorporating solution-processed V<SUB>2</SUB>O<SUB>5</SUB> thin-film interlayers. The original V<SUB>2</SUB>O<SUB>5</SUB> powder of orange color is dissolved in NH<SUB>3</SUB> solvent (0.5wt%) and changed into a transparent solution after moderate heating. We are able to fabricate V<SUB>2</SUB>O<SUB>5</SUB> thin films (1-6nm) on Mo electrodes by simple spin-coating. Kelvin probe measurements reveal that the work function of the Mo electrodes progressively changed from 4.4 to 4.9eV. With the insertion of the V<SUB>2</SUB>O<SUB>5</SUB> layer, OFETs gained significantly improved p-type performance for both regioregular poly(3-hexylthiophene) (rr-P3HT) and ambipolar 3,6-Bis-(5bromo-thiophen-2-yl)-N,N-bis(2-octyl-1-dodecyl)-1,4-dioxo-pyrrolo[3,4-c]pyrrole (DPPT-TT) polymer semiconductors. OFETs on the basis of rr-P3HT or DPPT-TT with V<SUB>2</SUB>O<SUB>5</SUB>/Mo electrodes exhibit field-effect mobilities of 0.15 and 1.91cm<SUP>2</SUP>/Vs, respectively, highly improved from 0.05 and 1.2cm<SUP>2</SUP>/Vs in case of OFETs with bare Mo. This performance is already comparable with that of OFETs employing much more expensive Au electrodes. After investigating the contact resistance, we propose that the improvement relies on balancing two factors: modulating the injection barrier by tuning the work function, and manipulating the tunnel distance by controlling the film thickness.