A Monte Carlo code was employed to simulate the remitted time-resolved fluorescence from bi-layered tissue models. The influence of endoscopy compatible source-detector geometries for detecting variations in epithelia...
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Polystyrene microspheres were previously reported to reduce fluorophore quantum yield via collisional quenching in fluorescein-based tissue-simulating phantoms. Here, we report decreases of fluorescence intensities an...
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Temperature and magnetic field dependent magnetization and heat capacity of polycrystalline Gd5Ge4 have been measured. In addition to the antiferromagnetic ordering observed at the Néel temperature, TN=128K, ther...
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Temperature and magnetic field dependent magnetization and heat capacity of polycrystalline Gd5Ge4 have been measured. In addition to the antiferromagnetic ordering observed at the Néel temperature, TN=128K, there is a cusp at ∼17.5K in the low-field zero-field cooled (zfc) M(T) curves, below which the zfc and field-cooled (fc) magnetic data exhibit irreversibility. The zfc and fc magnetization data show a complex mixture of reversible and irreversible behaviors at fields between ∼10 and ∼18kOe, which is correlated to the magnetic field induced transitions between the antiferromagnetic (AFM) and the ferromagnetic (FM) states. The initial zfc M(H) data below a certain temperature exhibit two transitions: a discontinuous metamagnetic-like transition and a continuous magnetic moment rotation process. The anomalies in the isofield and isothermal magnetization data indicate a complex magnetic structure at low temperatures, e.g., a complex canted AFM structure. In addition, magnetic field or temperature induced AFM↔FM transitions occur under certain conditions. The unusual magnetic behavior is discussed in terms of a possible complex magnetic structure at low temperatures and a martensitic-like structural change induced by the magnetic field
The quantitative determination of the three-dimensional Wulff shape for a metallic crystal-melt system is reported here. The anisotropy of crystal-melt interfacial free energy is experimentally measured for the Al–Sn...
The quantitative determination of the three-dimensional Wulff shape for a metallic crystal-melt system is reported here. The anisotropy of crystal-melt interfacial free energy is experimentally measured for the Al–Sn binary system at temperatures of 300 and 500°C. Equilibrium shapes of liquid droplets entrained within the crystalline phase are measured experimentally on sequential two-dimensional sections, and the three-dimensional Wulff plot is reconstructed. For this system, it is found that a single-parameter description of anisotropy is not sufficient, and the anisotropy is reported using the leading terms of the relevant cubic harmonics. Accordingly, the anisotropy coefficients are determined to be ε1=(1.81±0.36)×10−2 and ε2=(−1.12±0.13)×10−2. In addition, the corresponding normal stiffness components as well as a generalized stiffness are quantified and compared with available predictions from atomistic simulations.
The observed magnetoresistance of single crystalline Gd5Si2Ge2 is negative and strongly anisotropic. The absolute values measured along the [100] and [010] directions exceed those parallel to the [001] direction by mo...
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The observed magnetoresistance of single crystalline Gd5Si2Ge2 is negative and strongly anisotropic. The absolute values measured along the [100] and [010] directions exceed those parallel to the [001] direction by more than 60%. First principles calculations demonstrate that a structural modification is responsible for the anisotropy of the magnetoresistance, and that the latter is due to a significant reduction of electronic velocity in the [100] direction and the anisotropy of electrical conductivity.
Anodic aluminum oxide (AAO) has long been considered n viable material for templuted growth of nanomaterials for electronic, magnetic and optical applications due to the ability to form self-organized, high aspect-rat...
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Colloid formation and subsequent laser-induced bleaching in fluorite has been studied by transmission election microscopy and electron diffraction. At high incident electron-beam (e-beam) energies, Ca colloids with di...
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We outline key design features for a versatile imaging and hard X-ray beamline for operation at the Australian Synchrotron. Special attention is paid to the implementation of in-line phase-contrast imaging using both ...
Femtosecond laser ablation studies of silicon with and without the native oxide on the surface were conducted in an ultrahigh vacuum environment. SEM results show a clear difference in the laser intensity threshold fo...
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