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Enhanced critical current densities in Cu-sheathed MgB2
N.M.Strickland,R.G.Buckley,A.Otto 한국물리학회 2004 Current Applied Physics Vol.4 No.6
Micron-scale mixing of magnesium and boron powders by mechanical alloying allows the MgB2 formation reaction to proceed aslow as 450 .C, with high-quality material formed in an hour at 600.C. At these low reaction temperatures the reaction can be per-formed in situ in a copper sheath, and it is found that the presence of copper enhances the superconducting properties of the MgB2.Self-eld critical current densities, calculated from full critical-state simulation of magnetization hysteresis, are up to 7·105 A/cm2 at13.6 K and 1·105 A/cm2 at 30 K.
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.
Oxygen loading in second-generation high-temperature superconductor tapes
N.M. Strickland,G.V.M. Williams,Anita Semwal,D.T. Verebelyi,W. Zhang 한국물리학회 2006 Current Applied Physics Vol.6 No.3
We report a study of oxygen loading in YBa2Cu3O7. d coated conductors fabricated by metalorganic deposition. In situ X-ray dirac-tion experiments allowed the measurement of small changes in thec-axis lattice parameter during and after oxygen loading, and thesechanges could be correlated with the oxygen stoichiometry. The variation of the superconducting transition temperature and critical cur-oxygen loading. Optimum performance is therefore obtained by fully oxygen loading to an overdoped state.
Microstructure of metal-organic deposited YBa₂Cu₃O7-δ wires with Dy and Zr additions observed by TEM
J.A. Xia,N.J. Long,N.M. Strickland,P. Hoefakker,E.F. Talantsev 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
The improvement of critical current densities of superconducting wires is essential for commercial applications. Many approacheshave been demonstrated to enhance ux pinning of YBa₂Cu₃O7-δ (YBCO) second-generation (2G) superconducting wires and thereforedensity through ux pinning by nanoparticles in metal-organic deposited (MOD) YBCO lms with Dy or Zr additions. Transmissionelectron microscopy (TEM) observation revealed that large densities of nanoparticles can be formed in YBCO lms through alteringthe precursor stoichiometry and cation additions. Most of these nanoparticles are in the range of 10-50 nm, and are well dispersed, mak-ing them ideal for ux pinning in YBCO 2G wires. The eects on critical current of these nanoparticles acting as ux pinning centers areinvestigated.
Critical current anisotropy for second generation HTS wires
E.F. Talantsev,N.M. Strickland,P. Hoefakker,J.A. Xia,N.J. Long 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Angular anisotropies of critical currents with respect to an applied magnetic eld,Ic(B,h), were experimentally studied for two typesof second-generation high-temperature superconductor (HTS) tapes synthesized by metal-organic and E-beam deposition. We alsoexamine the angular dependence of the power-law exponent in the electric eld-current density relation. The angular dependence of theseparameters provides an insight into the nature of the ux-pinning mechanisms in these tapes.
Casati, S.,Aschberger, K.,Barroso, J.,Casey, W.,Delgado, I.,Kim, T. S.,Kleinstreuer, N.,Kojima, H.,Lee, J. K.,Lowit, A.,Park, H. K.,Ré,gimbald-Krnel, M. J.,Strickland, J.,Whelan, M.,Yang, Y.,Zua Springer Berlin Heidelberg 2018 Archives of toxicology Vol.92 No.2
<P>Skin sensitisation is the regulatory endpoint that has been at the centre of concerted efforts to replace animal testing in recent years, as demonstrated by the Organisation for Economic Co-operation and Development (OECD) adoption of five non-animal methods addressing mechanisms under the first three key events of the skin sensitisation adverse outcome pathway. Nevertheless, the currently adopted methods, when used in isolation, are not sufficient to fulfil regulatory requirements on the skin sensitisation potential and potency of chemicals comparable to that provided by the regulatory animal tests. For this reason, a number of defined approaches integrating data from these methods with other relevant information have been proposed and documented by the OECD. With the aim to further enhance regulatory consideration and adoption of defined approaches, the European Union Reference Laboratory for Alternatives to Animal testing in collaboration with the International Cooperation on Alternative Test Methods hosted, on 4–5 October 2016, a workshop on the international regulatory applicability and acceptance of alternative non-animal approaches, i.e., defined approaches, to skin sensitisation assessment of chemicals used in a variety of sectors. The workshop convened representatives from more than 20 regulatory authorities from the European Union, United States, Canada, Japan, South Korea, Brazil and China. There was a general consensus among the workshop participants that to maximise global regulatory acceptance of data generated with defined approaches, international harmonisation and standardisation are needed. Potential assessment criteria were defined for a systematic evaluation of existing defined approaches that would facilitate their translation into international standards, e.g., into a performance-based Test Guideline. Informed by the discussions at the workshop, the ICATM members propose practical ways to further promote the regulatory use and facilitate adoption of defined approaches for skin sensitisation assessments.</P>