Search results for: Y.Y. Ye

Items from 1 to 13 out of 13 results

article

Critical values in hematology of 862 institutions in China

Y.Y. Ye, H.J. Zhao, Y. Fei, W. Wang, more

International Journal of Laboratory Hematology > 39 > 5 > 513 - 520

Introduction A national survey on critical values in hematology of China laboratories was conducted to determine the current practice and assess the quality indicators so as to obtain a quality improvement. Methods Laboratories participating were asked to submit the general information, the practice of critical value reporting, and the status of timeliness of critical value reporting. Results...

article

Effect of Nb and W substitutions on the stability of the A15 Mo3Si phase

P.K. Ray, Y.Y. Ye, M. Akinc, M.J. Kramer

Journal of Alloys and Compounds > 2012 > 537 > Complete > 65-70

A combination of theoretical and experimental studies on the stability of Mo ₃ Si with Nb and W substitutions has been presented in this paper. The first principles calculations suggest that the formation enthalpy of the A15 phase favors Nb substitution up to 37.5atom %. In case of W substitution, the formation enthalpies increase monotonically. Experimental studies on the other hand, showed...

article

Imaging study of the long extracranial extension of the inferior petrosal sinus with MSCT

W.G. Zhang, Y.Y. Ye, J.H. Chen, R. Chen, more

Clinical Anatomy > 23 > 2 > 160 - 167

The aim of this study was to explore the anatomic route of Long‐Inferior Petrosal Sinuses (IPS) with multi‐slice spiral computed tomography, and to provide referenced evidence for the interventional preoperative evaluation for the diagnosis and treatment of skull base and sellar lesions. The route of Long‐IPS and its confluence with the internal jugular vein (IJV) and the connection level of 12 IPS...

article

In situ observation of thermal expansion of tetragonal C11b phase in Zr2Cu(1−x)Pdx alloys

Min Xu, Y.Y. Ye, J.R. Morris, D.J. Sordelet, more

Intermetallics > 2010 > 18 > 1 > 8-13

The C11b phase crystalline structure (structure type MoSi ₂ , space group I4/mmm) in the Zr ₂ Cu _(1−x) Pd _x (x=0, 0.25, 0.5, 0.75 and 1) alloys was examined in situ using high temperature X-ray diffraction (HTXRD) and Rietveld refinement of the data obtained at a constant heating rate. While the cell volume increases with increasing Pd as expected by the larger atomic...

article

Influence of oxygen on the structure and devitrification pathways in Zr66.7Ni33.3 and Zr66.7Cu33.3 amorphous systems

X.Y. Yang, Y.Y. Ye, M.J. Kramer, D.J. Sordelet

Journal of Alloys and Compounds > 2009 > 484 > 1-2 > 914-919

Experimental and theoretical approaches were combined to investigate the role of O on the as-quenched structure and phase selection process during devitrification of melt-spun Zr _66.7 Ni _33.3 and Zr _66.7 Cu _33.3 metallic glasses. Oxygen was observed to degrade glass formation for both systems at relatively high contents approaching 15,000ppm mass, but at lower amounts...

article

Phase Stability and Transformations in the Zr₂Ni_xCu_1−x Amorphous System

M.J. Kramer, Min Xu, Y.Y. Ye, D.J. Sordelet, more

Metallurgical and Materials Transactions A > 2008 > 39 > 8 > 1847-1856

Since Ni and Cu differ by only one valence electron, yet have nearly identical atomic sizes (1.27 vs 1.28 Å for Cu and Ni, respectively), the amorphous Zr₂Ni_xCu_1−x system is ideal for isolating the effects of electronic structure on short- and medium-range order and the concomitant influence of both the structure and order on devitrification pathways. Thermal analysis, time-resolved high-energy...

article

Theoretical and experimental studies of devitrification pathways in the Zr2Cu1−xPdx metallic glass system

J.R. Morris, Min Xu, Y.Y. Ye, D.J. Sordelet, more

Acta Materialia > 2007 > 55 > 17 > 5901-5909

Using a model amorphous alloy series, Zr ₂ Cu ₁₋ _x Pd _x (x =0, 0.25, 0.5, 0.75 and 1), we demonstrate that ab initio calculations can predict likely metastable phase formation during devitrification by comparing these with time-resolved X-ray scattering studies. All compositions share the same equilibrium C11 _b phase, yet they follow different devitrification pathways...

article

Diffusion of Pb adatom and ad-dimer on Si(100) from ab initio studies

T.-L. Chan, Y.Y. Ye, C.Z. Wang, K.M. Ho

Surface Science > 2006 > 600 > 13 > L159-L163

The diffusion pathways of Pb adatoms and ad-dimers on Si(100) are investigated by first-principles calculations. Pb adatoms are found to diffuse on top of the Si(100) dimer row with an energy barrier of 0.31eV. However, Pb dimers are energetically more stable. Pb dimers on top of the dimer row have a high energy barrier (0.95eV) to rotate from the lowest energy configuration to the orientation parallel...

article

Starting Torque of Single-Phase Flux-Switching Permanent Magnet Motors

Y. Chen, S. Chen, Z.Q. Zhu, D. Howe, more

IEEE Transactions on Magnetics > 2006 > 42 > 10 > 3416 - 3418

Flux-switching permanent magnet motors are a form of brushless dc motor, with a simple salient-pole rotor, similar to that of a switched reluctance motor, and the excitation coils and permanent magnets on the stator. The influence of the rotor pole-arc and asymmetry on the torque-rotor position characteristic of a single-phase flux-switching permanent magnet motor is investigated by finite-element...

article

The Anisotropic Free Energy of the Solid-Liquid Phase Boundary in Al

J.R. Morris, Z.Y. Lu, Y.Y. Ye, K.M. Ho

Interface Science > 2002 > 10 > 2-3 > 143-148

We have performed large-scale molecular dynamics simulations of solid-liquid interfaces in aluminum, in order to calculate their interfacial stiffness and free energy. The anisotropy of these properties, though small, is key for determining the steady-state solutions for solidification in three dimensions. We find that the interfacial free energy, γ(θ), can be well represented by the form γ(θ) = γ...

article

Theoretical calculations and experimental measurements of the structure of Ti5Si3 with interstitial additions

J.J. Williams, Y.Y. Ye, M.J. Kramer, K.M. Ho, more

Intermetallics > 2000 > 8 > 8 > 937-943

The equilibrium structural parameters, enthalpies of formation and partial densities of state for Ti ₅ Si ₃ and Ti ₅ Si ₃ Z _0.5 (Z= B, C, N or O) were calculated based on first-principle techniques. Enthalpy of formation calculations suggest that of the known structures for transition metal (TM) silicide compounds containing TM ₅ Si ₃ (D8 ...

article

Phase stability, bonding mechanism, and elastic constants of Mo ₅ Si ₃ by first-principles calculation

C.L. Fu, Xindong Wang, Y.Y. Ye, K.M. Ho

Intermetallics > 1999 > 7 > 2 > 179-184

We present results of first-principles local-density-functional calculations of the structural and elastic properties of Mo ₅ Si ₃ . Among the three different structures (D8 _m , D8 ₈ , and D8 _l ), the D8 _m structure (referred to as the T1 phase) has the greatest binding with a high heat of formation of -3.8 eV/formula unit. The bonding in Mo ₅ ...

article

Electronic structure and stability of Ti-based B2 shape-memory alloys: By LMTO-ASA

H.J. Liu, Y.Y. Ye

Solid State Communications > 1998 > 106 > 4 > 197-202

The electronic and structural properties for TiM alloys (where M stands for Fe, Co, Ni, Pd, Pt, Cu, Ag and Au) with B2 (CsCl) structure are systematically studied using an LMTO-ASA method. Our discussion gives a detailed explanation of correlations between B2 phase stability and electronic structure for these alloys. Using two parameters, (1) overlapped area of site and momentum decomposed DOS, (2)...

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