B. Zhang

Northeastern University (Shenyang, China), Feng-t’ien, Liaoning, China

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Publications (131)262.19 Total impact

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    ABSTRACT: We clearly show that fatigue-induced grain growth is suppressed in the annealed nanocrystalline Cu films, which leads to the enhanced resistance to fatigue cracking compared with that of the as-deposited ones. Annealing-stabilization of the nanograin boundaries may provide a potential way to enhance fatigue reliability of nanoscale film-based flexible devices.
    Materials Science and Engineering A 03/2015; 627. DOI:10.1016/j.msea.2014.12.098 · 2.41 Impact Factor
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    X.M. Luo, B. Zhang, G.P. Zhang
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    ABSTRACT: Thermal fatigue failure of metallization interconnect lines subjected to alternating currents (AC) is becoming a severe threat to the long-term reliability of micro/nanodevices with increasing electrical current density/power. Here, thermal fatigue failure behaviors and damage mechanisms of nanocrystalline Au interconnect lines on the silicon glass substrate have been investigated by applying general alternating currents (the pure alternating current coupled with a direct current (DC) component) with different frequencies ranging from 0.05 Hz to 5 kHz. We observed both thermal fatigue damages caused by Joule heating-induced cyclic strain/stress and electromigration (EM) damages caused by the DC component. Besides, the damage formation showed a strong electrically-thermally-mechanically coupled effect and frequency dependence. At lower frequencies, thermal fatigue damages were dominant and the main damage forms were grain coarsening with grain boundary (GB) cracking/voiding and grain thinning. At higher frequencies, EM damages took over and the main damage forms were GB cracking/voiding of smaller grains and hillocks. Furthermore, the healing effect of the reversing current was considered to elucidate damage mechanisms of the nanocrystalline Au lines generated by the general AC. Lastly, a modified model was proposed to predict the lifetime of the nanocrystalline metal interconnect lines, i.e., that was a competing drift velocity-based approach based on the threshold time required for reverse diffusion/healing to occur.
    Journal of Applied Physics 09/2014; 116(10):103509-103509-9. DOI:10.1063/1.4894825 · 2.19 Impact Factor
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    ABSTRACT: Cu-doped ZnO films were prepared by rf magnetron sputtering on sapphire substrate at different atmosphere. Microstructure of these films and Cu occupation sites were investigated using PIXE, SR-XRD and EXAFS. Only 2.9 at.% Cu, no other magnetic impurities (e.g., Fe, Co and Ni) were detected. The ZnO:Cu films possessed the wurtzite ZnO structures and no precipitates (e.g., CuO and Cu2O or Cu cluster) were found. Cu atoms were incorporated into ZnO crystal lattice by occupying Zn atomic sites.
    Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms 08/2014; 332:126-129. DOI:10.1016/j.nimb.2014.02.044 · 1.19 Impact Factor
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    ABSTRACT: We present the photocurrent spectrum study of a quantum dot (QD) single-photon detector using a reset technique which eliminates the QD's “memory effect.” By applying a proper reset frequency and keeping the detector in linear-response region, the detector's responses to different monochromatic light are resolved which reflects different detection efficiencies. We find the reset photocurrent tails up to 1.3 μm wavelength and near-infrared (∼1100 nm) single-photon sensitivity is demonstrated due to interband transition of electrons in QDs, indicating the device a promising candidate both in quantum information applications and highly sensitive imaging applications operating in relative high temperatures (>80 K).
    Applied Physics Letters 07/2014; 105(3):031114-031114-3. DOI:10.1063/1.4890022 · 3.52 Impact Factor
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    ABSTRACT: Fatigue properties of the Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy sheets containing different numbers of α/β Widmanstätten colonies in the thickness direction of the sheets were investigated by tension-tension fatigue testing. It is found that fatigue properties of the Ti alloy either in low- or high-stress amplitude regimes become more sensitive to the sheet thickness of the Ti alloy as the sheet thickness is comparable to the length scale of the Widmanstätten colonies. The basic mechanism of such length scale-sensitive fatigue properties in the Ti alloy was elucidated.
    Journal of Materials Science and Technology -Shenyang- 07/2014; DOI:10.1016/j.jmst.2014.07.012 · 1.61 Impact Factor
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    ABSTRACT: Tensile properties of ultrafine grained Cu/Ni laminated composites prepared by dual-bath electrodeposition technique were investigated by tensile tests at different strain rates ranging from 1×10−5 to 1×10−2 s−1. The results show that the stress gradient close to heterogeneous interfaces established at high strain rates may influence mechanical properties of the ultrafine-grained Cu/Ni laminates, leading to a simultaneous increase in strength and ductility as the strain rate increases from 1×10−5 to 1×10−2 s−1. The effect of such stress gradient in the laminated composites is analyzed to understand the abnormal increase in ductility with strain rate.
    Materials Science and Engineering A 07/2014; 609:318–322. DOI:10.1016/j.msea.2014.04.111 · 2.41 Impact Factor
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    ABSTRACT: Hepatocellular carcinoma (HCC) is believed to arise from tumor-initiating cells (T-ICs), which are responsible for tumor relapse and metastases. Portal vein tumor thrombus (PVTT) is raised from HCC and strongly correlated to a poor prognosis. However, the mechanism underling the formation of PVTT is largely unknown. Herein, we provide evidence that RNA polymerase II subunit 5 (RPB5)-mediating protein (RMP) was progressively upregulated in PVTT and overexpressed RMP appeared to increase T-ICs self-renewal. Moreover, RMP promoted metastases of PVTT cells and HCC cells in vitro and in vivo. Knockdown of RMP attenuated T-ICs self-renewal and reversed epithelial-mesenchymal transition (EMT) in HCC and PVTT cells. The neutralizing assays suggested that interleukin-6 (IL-6) had an indispensable role in RMP regulating metastases and self-renewal of HCC cells. Furthermore, the transcription of IL-6 was verified to be modulated by RMP via interaction with p65 and RPB5, through which expanding the T-IC/cancer stem cell populations, as well as inducing EMT was promoted. These results suggested that RMP may promote PVTT formation by promoting IL-6 transcription. Thus, RMP serves as a potent factor contributed to develop PVTT and a promising therapeutic target for HCC patients.Oncogene advance online publication, 7 April 2014; doi:10.1038/onc.2014.84.
    Oncogene 04/2014; DOI:10.1038/onc.2014.84 · 8.56 Impact Factor
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    J. Xu, C.Y. Dai, B. Zhang, G.P. Zhang
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    ABSTRACT: The experimental observations on dislocation structures in the micron-thick cantilever beam-type samples of copper single crystals subjected to symmetrically-reversed bending load and the theoretical simulations using the modified reaction–diffusion model were conducted. It was found that strain-gradient introduced by inhomogeneous deformation has a strong influence on dislocation patterning behavior, cyclic deformation response and fatigue life of the micron-thick copper single crystal beams. The simulation results provide a deep insight into the effects of the geometrical scale and the strain gradient on fatigue behaviors in micron-thick metal foils subjected to symmetrically-reversed bending load.
    Computational Materials Science 04/2014; 85:223–229. DOI:10.1016/j.commatsci.2014.01.004 · 1.88 Impact Factor
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    ABSTRACT: This study investigated the population genetics, demographic history and pathway of invasion of the Russian wheat aphid (RWA) from its native range in Central Asia, the Middle East and Europe to South Africa and the Americas. We screened microsatellite markers, mitochondrial DNA, and endosymbiont genes in 504 RWA clones from nineteen populations worldwide. Following pathway analyses of microsatellite and endosymbiont data, we postulate that Turkey and Syria were the most likely sources of invasion to Kenya and South Africa, respectively. Furthermore, we found that one clone transferred between South Africa and the Americas was most likely responsible for the New World invasion. Finally, endosymbiont DNA was found to be a high resolution population genetic marker, extremely useful for studies of invasion over a relatively short evolutionary history timeframe. This study has provided valuable insights into the factors that may have facilitated the recent global invasion by this damaging pest. This article is protected by copyright. All rights reserved.
    Molecular Ecology 03/2014; 23(8). DOI:10.1111/mec.12714 · 5.84 Impact Factor
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    ABSTRACT: Bio-inspired (nanocrystalline TiO2/polyelectrolyte (PE))4 nanolayered composites were synthesized by the layer-by-layer self-assembly and chemical bath deposition methods. The results show that the thicknesses of the TiO2 and PE layers in the as-synthesized are 41.3 nm and 9.6 nm, respectively, and the grain size of the TiO2 layer is about 5 nm. For the type I cracking, the fracture toughness (KIC = 1.18 ± 0.67 MPa m1/2) of 41.3 nm TiO2/9.6 nm PE composite is larger than that of the bulk TiO2. For the type II cracking, the crack deflection occurred in the composite. This toughening behavior was attributed to the low interfacial fracture energy and the large ratio of the crack deflection length to the crack penetration length. Our finding demonstrates that the crack deflection is an effective way to toughen the bio-inspired nanocrystalline TiO2/PE nanolayered composites.
    Materials Research Bulletin 02/2014; 50:128–131. DOI:10.1016/j.materresbull.2013.10.019 · 1.97 Impact Factor
  • B. Zhang, Y.G. Chen, H.B. Guo
    Journal of Alloys and Compounds 01/2014; 582:496-499. DOI:10.1016/j.jallcom.2013.07.190 · 2.73 Impact Factor
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    ABSTRACT: The excited states in 107Ag were populated through the heavy-ion fusion evaporation reaction 100Mo (11B, 4n) 107Ag at a beam energy of 46 MeV. Lifetimes of high-spin states in 107Ag have been measured through the Doppler shift attenuation method. The deduced B (M1) values, gradually decreasing with increasing spin, clearly demonstrate that both the yrast positive-parity band and the yrast negative-parity band in 107Ag are magnetic rotation bands. Furthermore, experimental deduced B (M1) values for the yrast positive-parity band are compared with the predictions of the particle rotor model. The approximate agreement between theoretical calculations and experimental results further confirms the mechanism of magnetic rotation for the yrast positive-parity band. In addition, a systematic investigation shows the evolution of the magnetic rotation mechanism in the A ≈110 mass region.
    Physical Review C 12/2013; 89(1). DOI:10.1103/PhysRevC.89.014327 · 3.88 Impact Factor
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    ABSTRACT: The infrared dielectric property of monoclinic BaTeMo2O9 single crystals is studied by polarized IR reflectance spectra from 20 to 1800 cm−1. Based on the modified Lorentz model, the frequencies, strengths, and dampings of TO modes as well as the orientations of the dipole momenta are determined, agreeing well with Raman spectra and results from First-principles calculation. The observed modes are visually assigned to the specific atoms' motions in the primitive cell based on the theory calculations. A large shift of the internal modes of the anion groups relative to free anion co-ordination polyhedra is observed, which can be used to indicate the distortions of co-ordination polyhedra related to the nonlinear optical properties. Further, the experimental results of the strengths of the oscillators support the elimination and splitting of degenerate modes in free regular polyhedrons. These results offer a way to evaluate the nonlinear optical properties by use of traditional IR reflectivity spectra.
    Journal of Applied Physics 12/2013; 114(23):233505. DOI:10.1063/1.4844555 · 2.19 Impact Factor
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    ABSTRACT: We have performed the study on the dependence of laser beam induced current (LBIC) spectra on the temperature for the vacancy-doped molecular beam epitaxy grown Hg1-xCdxTe (x = 0.31) photodiodes by both experiment and numerical simulations. It is found that the measured LBIC signal has different distributions for different temperature extents. The LBIC profile tends to be more asymmetric with increasing temperature below 170 K. But the LBIC profile becomes more symmetric with increasing temperature above 170 K. Based on a localized leakage model, it is indicated that the localized junction leakage can lead to asymmetric LBIC signal, in good agreement with the experimental data. The reason is that the trap-assisted tunneling current is the dominant leakage current at the cryogenic temperature below 170 K while the diffusion current component becomes dominant above the temperature of 170 K. The results are helpful for us to better clarify the mechanism of the dependence of LBIC spectra on temperature for the applications of HgCdTe infrared photodiodes.
    Journal of Applied Physics 11/2013; 114(17):173107-173107-5. DOI:10.1063/1.4829452 · 2.19 Impact Factor
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    ABSTRACT: The excited states in 107Ag were populated through the heavy-ion fusion-evaporation reaction 100Mo (11B, 4n) 107Ag at a beam energy of 46 MeV. 12 Compton suppressed HPGe detectors and 2 planar HPGe detectors were employed to detect the de-excited γ rays from the reaction residues. Lifetimes of high spin states in 107Ag have been measured using the Doppler shift attenuation method (DSAM) and the deduced B(M1) and B(E2) transition probabilities have been derived from the measured lifetimes.
  • B. Zhang, Y. G. Chen, H. B. Guo
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    ABSTRACT: A ternary Cu-Hf-Al amorphous thin film with excellent corrosion resistance was successfully synthesized using DC magnetron sputtering method. Electrochemical behaviors of the Cu-Hf-Al films have been studied in four different corrosive media (NaCl, KCl, Na2SO4, and H2SO4 solutions). According to the annealed samples' X-ray diffraction (XRD) pattern we found that the glass transition temperature T-g of the Cu-Hf-Al amorphous film is around 580 degrees C. Distinct polarization behaviors were found for the film in 1 mol/L H2SO4 and 0.5 mol/L Na2SO4 solutions. The as-synthesized films exhibit much higher corrosion resistance in H+ or Na+ environments than in Cl-environments. In Cl-containing solutions the films also show distinct spontaneous passivation although they suffer pitting by anodic polarization. Annealing was also found to affect the electrochemical behaviors of the amorphous films. The samples annealed at 600 and 700 degrees C showed complete passive behavior in the polarization curves and their passivity was broken gradually.
    10/2013; 3(1):C1-C3. DOI:10.1149/2.004401eel
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    ABSTRACT: The mechanical softening behaviour of micrometre-scale metals (free-standing metal foils and wires) with decreasing either the geometrical or the microstructural scale (i.e. the smaller, the weaker) has recently been reported. Here, we present a mechanism-based model to understand the softening behaviour, which is based on competition between the effects of surface grain relaxation and the interior grain strengthening effect. The model describes well the yield stress of Cu foils with different ratios of the thickness to grain size.
    Philosophical Magazine Letters 09/2013; 93(9-9):531-540. DOI:10.1080/09500839.2013.816447 · 1.27 Impact Factor
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    C.Y. Dai, B. Zhang, J. Xu, G. P. Zhang
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    ABSTRACT: Fatigue behaviors of two types of polycrystalline Cu foils (i.e. foil thickness (t)-constant and grain size(d)-constant foils) with different ratios of the foil thickness to the grain size (t/d) at micrometer scales were investigated. The experimental results reveal that under total strain control the fatigue life of the foils strongly depends on the tensile plasticity of the foils and the coupled effect of t and d. The large tensile plasticity leads to the high fatigue strength of the Cu foils. The contribution of surface grains to fatigue properties becomes more and more important as decreasing t/d. The coupled effects of the geometrical scale and the microstructural scale on fatigue damage formation and crack growth resistance are analyzed and the basic mechanisms are elucidated.
    Materials Science and Engineering A 07/2013; 575:217–222. DOI:10.1016/j.msea.2013.03.064 · 2.41 Impact Factor
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    ABSTRACT: Background:Asparagine synthetase (ASNS) is associated with drug resistance in leukaemia, and the function of this enzyme in the context of hepatocellular carcinoma (HCC) is not clear. In this study, the relationship between ASNS expression and clinical outcomes after surgical resection was investigated, and the therapeutic value of ASNS was also evaluated.Methods:The expression of ASNS was evaluated in HCC samples by real-time PCR and immunohistochemistry assays. The correlation between ASNS expression and clinicopathological features was investigated. Potential clinicopathological prognostic factors were examined by univariate and multivariate survival analysis. Asparagine synthetase was overexpressed and knocked down in HCC cell lines to assess the influence of the enzyme on cell proliferation, migration and tumourigenicity. L-asparaginase was used to treat HCC cells with high or low levels of ASNS in vitro and in vivo to examine the therapeutic efficacy.Results:The expression of ASNS was higher in HCC tumour tissues and was closely correlated with the serum AFP level, tumour size, microscopic vascular invasion, tumour encapsulation, TNM stage and BCLC stage. Patients with low ASNS expression levels had a poor prognosis with respect to overall survival (OS). The multivariate survival analysis indicated that ASNS is an independent prognostic factor for OS. Furthermore, functional studies demonstrated that ASNS significantly inhibits the proliferation, migration and tumourigenicity of HCC cells. The knockdown of ASNS markedly increased sensitivity to L-asparaginase, indicating that cells with different ASNS protein levels have different sensitivities to L-asparaginase.Conclusion:The expression of ASNS is an independent factor affecting the survival of HCC patients, and low ASNS expression in HCC was correlated with worse surgical outcomes. The ASNS may be a promising therapeutic target for the treatment of HCC.British Journal of Cancer advance online publication, 13 June 2013; doi:10.1038/bjc.2013.293 www.bjcancer.com.
    British Journal of Cancer 06/2013; DOI:10.1038/bjc.2013.293 · 5.08 Impact Factor
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    ABSTRACT: A C–W co-deposition layer, formed by radio frequency magnetron sputtering, was investigated to identify the characteristics of C–W mixed layers in fusion experimental reactors. The layers were characterized by ion beam analysis, Raman spectroscopy, X-ray diffraction and scanning electron microscopy. It was found that D atoms in C–W layers were mainly trapped by the C atoms. The ratio of C/W and D concentrations in the C–W layers deposited at a pressure of 5.0 Pa and a fixed flow rate ratio were 54/31 and 5%, respectively. They all increased significantly with increased flow rate of D2 but decreased with temperature at a relatively low level. The pressure dependence of the D concentration showed a maximum value around 5 Pa and it decreased with rising or decreasing pressure. Both Raman and X-ray analysis revealed that the structure of the C–W layers became more graphite-like with increasing temperature. Moreover, deuterium introduction made the tungsten carbide phase disappear in the deuterated C–W layers. Only erosion caves on the surface of the sample prepared at 300 K were observed by SEM. When the temperature increased, they disappeared, and convex bodies appeared.
    Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms 06/2013; 305:55–60. DOI:10.1016/j.nimb.2013.04.052 · 1.19 Impact Factor

Publication Stats

655 Citations
262.19 Total Impact Points

Institutions

  • 2005–2015
    • Northeastern University (Shenyang, China)
      • Key Laboratory for Anisotropy and Texture of Materials
      Feng-t’ien, Liaoning, China
    • Peking University
      • Department of Technical Physics
      Beijing, Beijing Shi, China
  • 2007–2014
    • Chinese Academy of Sciences
      • • Key Laboratory of Semiconductor Materials
      • • National Laboratory for Infrared Physics
      Peping, Beijing, China
  • 2013
    • Shanghai University
      • Department of Electronic Information Materials
      Shanghai, Shanghai Shi, China
    • Second Military Medical University, Shanghai
      • International Cooperation Laboratory on Signal Transduction
      Shanghai, Shanghai Shi, China
  • 2010–2013
    • China Institute of Atomic Energy
      Peping, Beijing, China
  • 2007–2013
    • Harbin Institute of Technology
      • • Department of Physics
      • • Department of Chemistry
      Charbin, Heilongjiang Sheng, China
  • 2004–2013
    • Fudan University
      • Institute of Modern Physics
      Shanghai, Shanghai Shi, China
  • 2012
    • Queensland University of Technology
      Brisbane, Queensland, Australia
  • 2006–2010
    • Technical Institute of Physics and Chemistry
      Peping, Beijing, China
  • 2009
    • Sichuan University
      • Department of Material Science
      Hua-yang, Sichuan, China
  • 2008
    • Peking Union Medical College Hospital
      • Department of Rheumatology
      Peping, Beijing, China