67 research outputs found
Analysis of Hot Points on Data Mining Research of Medical in Foreign Countries
To promote the current development of medical data mining research, a quantitative statistics and qualitative analysis of the papers in the field of medical data mining technologies were made with the methodology of bibliometric and knowledge mapping, which were enlisted in the database of Web of Science analyzing the general situation of the papers about data mining from several aspects: period sequences, subject funds, countries and regions, core authors and research institutions, the hotspots and research frontiers. Our analysis exposed that the research of data mining in medical showed a multi-disciplinary integration of the development trend, but high-yield leading author group has not yet formed. It is important to note that scholars should raise awareness of clinical medical data mining as well as explore new research directions for further studying
Spin Seebeck effect from antiferromagnetic magnons and critical spin fluctuations in epitaxial FeF2 films
We report a longitudinal spin Seebeck effect (SSE) study in epitaxially grown
FeF2(110) antiferromagnetic (AFM) thin films with strong uniaxial anisotropy
over the temperature range of 3.8 - 250 K. Both the magnetic field- and
temperature-dependent SSE signals below the N\'eel temperature (TN=70 K) of the
FeF2 films are consistent with a theoretical model based on the excitations of
AFM magnons without any net induced static magnetic moment. In addition to the
characteristic low-temperature SSE peak associated with the AFM magnons, there
is another SSE peak at TN which extends well into the paramagnetic phase. All
the SSE data taken at different magnetic fields up to 12 T near and above the
critical point TN follow the critical scaling law very well with the critical
exponents for magnetic susceptibility of 3D Ising systems, which suggests that
the AFM spin correlation is responsible for the observed SSE near TN
Extending the Propagation Distance of a Silver Nanowire Plasmonic Waveguide with a Dielectric Multilayer Substrate
Chemical synthesized silver nanowires have been proved to be the efficient
architecture for Plasmonic waveguides, but the high propagation loss prevents
their widely applications. Here, we demonstrate that the propagation distance
of the plasmons along the Ag NW can be extended if the Ag NW was placed on a
dielectric multilayer substrate containing a photonic band gap, but not placed
on a commonly used glass substrate. The propagation distance at 630 nm
wavelength can reach 16 um even that the Ag NW is as thin as 90 nm in diameter.
Experimental and simulation results further show that the polarization of this
propagating plasmon mode was nearly parallel to the surface of the dielectric
multilayer, so it was excited by a transverse-electric polarized Bloch surface
wave propagating along a polymer nanowire with diameter at only about 170 nm on
the same dielectric multilayer. Numerical simulations were also carried out and
consistent with the experiment results. Our work provides a platform to extend
the propagation distance of plasmonic waveguide and also for the integration
between photonic and plasmonic waveguides on the nanometre scale.Comment: 5 pages, 4 figure
Spin Seebeck effect from antiferromagnetic magnons and critical spin fluctuations in epitaxial FeF2 films
We report a longitudinal spin Seebeck effect (SSE) study in epitaxially grown
FeF2(110) antiferromagnetic (AFM) thin films with strong uniaxial anisotropy
over the temperature range of 3.8 - 250 K. Both the magnetic field- and
temperature-dependent SSE signals below the N\'eel temperature (TN=70 K) of the
FeF2 films are consistent with a theoretical model based on the excitations of
AFM magnons without any net induced static magnetic moment. In addition to the
characteristic low-temperature SSE peak associated with the AFM magnons, there
is another SSE peak at TN which extends well into the paramagnetic phase. All
the SSE data taken at different magnetic fields up to 12 T near and above the
critical point TN follow the critical scaling law very well with the critical
exponents for magnetic susceptibility of 3D Ising systems, which suggests that
the AFM spin correlation is responsible for the observed SSE near TN
Surface plasmon resonance hydrogen sensor based on metallic grating with high sensitivity
Abstract: High sensitivity is obtained at larger resonant incident angle if negative diffraction order of metallic grating is used to excite the surface plasmon. A highly sensitive grating-based surface plasmon resonance (SPR) sensor is designed for the hydrogen detection. A thin palladium (Pd) film deposited on the grating surface is used as transducer. The influences of grating period and the thickness of Pd on the performance of sensor are investigated using rigorous coupled-wave analysis (RCWA) method. The sensitivity as well as the width of the SPR curves and reflective amplitude is considered simultaneously for designing the grating-based SPR hydrogen sensor, and a set of optimized structural parameters is presented. The performance of grating-based SPR sensor is also compared with that of conventional prism-based SPR sensor. 12. M. J. Jory, P. S. Vukusic, and J. R. Sambles, "Development of a prototype gas sensor using surface plasmon resonance on gratings," Sens. Actuators B 17, 203-209 (1994). 13. C. R. Lawrence, N. J. Geddes, D. N. Furlong, and J. R. Sambles, "Surface plasmon resonance studies of immunoreactions utilizing disposable diffraction gratings," Biosens. Bioelectron. 11, 389-400 (1996). 14. D. Zhang, P. Wang, X. Jiao, G. Yuan, J. Zhang, C. Chen, H. Ming, and R. Rao, "Investigation of the sensitivity of H-shaped nano-grating surface plasmon resonance biosensors using rigorous coupled wave analysis," Appl. Phys. A 89, 407-411(2007 5056-5070 (1974). 18. D. R. Shankaran, K. V. Gobi, T. Sakai, K. Matsumoto, K. Toko, and N. Miura, "Surface plasmon resonance immunosensor for highly sensitive detection of 2, 4, 6-trinitrotoluene," Biosens. Bioelectron. 20, 1750-1756 (2005). 19. B. Chadwick, J. Tann, M. Brungs, and M. Gal, "A hydrogen sensor based on the optical generation of surface plasmons in a palladium alloy," Sens. Actuators B 17, 215-220 (1994)
Plasmon mode characteristics of metallic nanowire in uniaxial anisotropic dielectric
The plasmon mode characteristics of metallic nanowire embedded in a uniaxial anisotropic dielectric are investigated theoretically. The hybrid plasmon modes found in this structure are significantly different from the traditional plasmon modes of metallic nanowire in a homogeneous isotropic dielectric. In contrast to the transverse-magnetic-like wave for a traditional fundamental mode, the hybrid fundamental mode of metallic nanowire involves a nonzero longitudinal magnetic field component. The degenerate behaviors of adjacent order plasmon modes are demonstrated in the case of a strongly anisotropic dielectric. Moreover, the dependence of the degenerate characteristics on the radius of a metallic nanowire and the excited wavelength are clearly shown by dispersion relation. The results of the study provide a useful approach to modulate surface plasmon polaritons with anisotropic medium. (C) 2014 Optical Society of Americ
Stealth Electrode Dielectrophoresis: Microspheres Manipulation by Patterned 2-Dimensional Electron Gas (2DEG) in AlGaN/GaN Heterostructures
UV-illuminated dielectrophoresis by two-dimensional electron gas (2DEG) in AlGaN/GaN heterojunction
Dielectrophoresis (DEP) induced by activating a patterned two-dimensional electron gas (2DEG) at the interface of compound semiconductor AlGaN/GaN heterojunction has been demonstrated for the first time in our previous work. Briefly, with a peak voltage of +/-10Vand a frequency from 100 kHz to 1 MHz, characteristics of both positive and negative DEP have been observed successfully manipulating 2 mm polystyrene microspheres in a drop of deionized (DI) water (pH similar to 7 and conductivity 1 x 10(-4) Sm-1) over castellated 2DEG electrodes separated by critical dimensions 50 and 150 mu m. This study reports a peculiar observation encountered when performing the DEP experiments under ultraviolet (UV) radiation: The microspheres have been repelled from the 2DEG electrodes yet remained on the surface during pDEP and then levitated upon switching to nDEP. This behavior is not observed in DEP with conventional microelectrodes and explained here by the UV-induced electron-hole generation and the subsequent charge redistribution in the AlGaN/GaN heterostructure. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinhei
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