http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hamidian, M. H.,Edkins, S. D.,Joo, Sang Hyun,Kostin, A.,Eisaki, H.,Uchida, S.,Lawler, M. J.,Kim, E.-A.,Mackenzie, A. P.,Fujita, K.,Lee, Jinho,Davis, J. C. Sé,amus Nature Publishing Group, a division of Macmillan P 2016 Nature Vol.532 No.7599
<P>The quantum condensate of Cooper pairs forming a superconductor was originally conceived as being translationally invariant. In theory, however, pairs can exist with finite momentum Q, thus generating a state with a spatially modulated Cooper-pair density(1,2). Such a state has been created in ultracold Li-6 gas(3) but never observed directly in any superconductor. It is now widely hypothesized that the pseudogap phase(4) of the copper oxide superconductors contains such a 'pair density wave' state(5-21). Here we report the use of nanometre-resolution scanned Josephson tunnelling microscopy(22-24) to image Cooper pair tunnelling from a d-wave superconducting microscope tip to the condensate of the superconductor Bi2Sr2CaCu2O8+x. We demonstrate condensate visualization capabilities directly by using the Cooper-pair density variations surrounding zinc impurity atoms(25) and at the Bi2Sr2CaCu2O8+x crystal supermodulation(26). Then, by using Fourier analysis of scanned Josephson tunnelling images, we discover the direct signature of a Cooper-pair density modulation at wavevectors Q(P) approximate to (0.25, 0)2 pi/a(0) and (0, 0.25)2 pi/a(0) in Bi2Sr2CaCu2O8+x. The amplitude of these modulations is about five per cent of the background condensate density and their form factor exhibits primarily s or s' symmetry. This phenomenology is consistent with Ginzburg-Landau theory(5,13,14) when a charge density wave(5,27) with d-symmetry form factor(28-30) and wavevector Q(C) = Q(P) coexists with a d-symmetry superconductor; it is also predicted by several contemporary microscopic theories for the pseudogap phase(18-21).</P>
Heng, D. Y. C.,Choueiri, T. K.,Rini, B. I.,Lee, J.,Yuasa, T.,Pal, S. K.,Srinivas, S.,Bjarnason, G. A.,Knox, J. J.,MacKenzie, M.,Vaishampayan, U. N.,Tan, M. H.,Rha, S. Y.,Donskov, F.,Agarwal, N.,Kollma Oxford University Press 2014 ANNALS OF ONCOLOGY Vol.25 No.1
<P>This study focuses on the outcomes of a large international cohort of patients with metastatic RCC who would not have met the eligibility criteria for clinical trials and compares these to those that would have eligible. The proportion of patients who would have been ineligible and the reason for ineligibility are also discussed.</P>
S. Eitssayeam,U. Intatha,K. Pengpat,G. Rujijanagul,K.J.D. MacKenzie,T. Tunkasiri 한국물리학회 2009 Current Applied Physics Vol.9 No.5
Single-phase cubic Ba(Fe,Nb)0.5O3 (BFN) powder was synthesized by solid-state reaction at 900, 1000, 1100, 1200 ℃ for 4 h in air. X-ray diffraction indicated that the BFN oxide mixture calcined at 1200 ℃ crystallizes to the pure cubic perovskite phase. The crystallite size of the BFN increases slightly with increasing temperature, while the lattice strain progressively decreases. BFN ceramics were produced from this powder by sintering at 1350–1400 ℃ for 4 h in air. Samples prepared under these conditions achieved up to 97.4% of the theoretical density. The temperature dependence of their dielectric constant and loss tangent, measured at difference frequencies, shows an increase in the dielectric constant with sintering temperature and measurement frequency which is probably due to disorder on the B site ion of the perovskite. The Mössbauer spectra of these sintered BFN ceramics suggests the presence of a superstructure on the B-cation sublattice. Single-phase cubic Ba(Fe,Nb)0.5O3 (BFN) powder was synthesized by solid-state reaction at 900, 1000, 1100, 1200 ℃ for 4 h in air. X-ray diffraction indicated that the BFN oxide mixture calcined at 1200 ℃ crystallizes to the pure cubic perovskite phase. The crystallite size of the BFN increases slightly with increasing temperature, while the lattice strain progressively decreases. BFN ceramics were produced from this powder by sintering at 1350–1400 ℃ for 4 h in air. Samples prepared under these conditions achieved up to 97.4% of the theoretical density. The temperature dependence of their dielectric constant and loss tangent, measured at difference frequencies, shows an increase in the dielectric constant with sintering temperature and measurement frequency which is probably due to disorder on the B site ion of the perovskite. The Mössbauer spectra of these sintered BFN ceramics suggests the presence of a superstructure on the B-cation sublattice.
Structural and thermal characterisation of nanostructured alumina templates
I.W.M. Brown,M.E. Bowden,T. Kemmitt,K.J.D. MacKenzie 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Nanostructured anodic aluminium oxide materials containing a two dimensional array of high aspect ratio aligned pores of 200 nm.C. Thermal analysis shows two discrete irreversible exothermic eventsat 850.C and 1020 .C. XRD and27Al MAS NMR show the progressive development of local and long range order in the heated struc-tures and indicate a reaction sequence of amorphous Al2O3 ! h-Al2O3 ! a-Al2O3 (corundum). NMR shows the co-existence of alumin-ium in 4, 5 and 6-coordinated sites through most of the heating sequence until the stable (6-coordinated) corundum phase is established.Phosphorus impurities incorporated during the membrane fabrication process crystallise as an AlPO4 phase above 850 .C and play animportant role in directing the chemical, physical and structural outcomes of the heat treatment.