B. Zhang

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

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Publications (135)227 Total impact

  • 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. · 2.21 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. · 2.41 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; · 1.20 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; · 8.56 Impact Factor
  • 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. · 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; · 6.28 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. · 1.97 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 01/2014; 105(3):031114-031114-3. · 3.52 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). · 3.72 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.
    11/2013;
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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):531-540. · 1.16 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; · 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. · 1.19 Impact Factor
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    ABSTRACT: Carbon was deposited on Si and W substrates using a D2/He plasma in a radio frequency magnetron sputtering system. The deposited layers were examined with ion beam analysis (IBA), Raman spectra analysis (RS) and scanning electron microscopy (SEM). The growth rate of the layers deposited at 2.5 Pa total pressure and 300 K decreased with increasing He fraction in the D2/He gas mixture. The deuterium concentration in the layers deposited on the Si substrate increased from 14% to 28% when the flow rate of the He gas relative to the D2 gas was varied from 0.125 to 0.5, but the deuterium concentration in the layers on a W substrate decreased from 24% to 14%. Deuterium or helium retention and the layer thickness all significantly decreased when the substrate temperature was increased from 423 K to 773 K. Raman analysis showed that the deposited layers were amorphous deuterated-carbon layers (named a-C: D layer) and the extent of bond disorder increased dramatically with the increasing helium content in the film. Blisters and bubbles occurred in the films for high helium content in the films, and surface cracking and exfoliation were also observed.
    Journal of Nuclear Materials 05/2013; 436(s 1–3):93–99. · 2.02 Impact Factor
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    ABSTRACT: The spectroscopy of 157Yb has been studied via 144Sm(16O,3n)157Yb fusion-evaporation reaction. The properties of bands associated with the νi13/2 orbital and νh9/2 orbital in 157Yb are analyzed in comparison with the triaxial particle-rotor-model calculations. The characters of signature splitting for both positive-parity νi13/2 and negative-parity νh9/2 bands in 157Yb and heavier odd-A Yb isotopes are discussed. The newly observed bands 1 and 2 in 157Yb are suggested to be the signature partners of the νh9/2 band. A systematic study of the band crossing frequencies associated with the i13/2 neutron-pair and h11/2 proton-pair alignments for the Yb isotopes, as well as the Er and Hf isotopes, are made.
    Physical Review C 03/2013; 87(3). · 3.72 Impact Factor
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    ABSTRACT: Deformation behaviors of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloys with α/β lamellar structure were investigated systematically at different temperatures from room temperature to 950 °C and different strain rates. Results reveal that when the deformation temperature is higher than a critical temperature of 600 °C, an evident transition of deformation behavior from localized shear banding to α/β lamella kinking, flow softening and temperature/strain rate-dependent peak flow stress occurred in the alloy. The critical conditions for the occurrence of internal cracking and strain localization behavior associated with temperature and strain rate were determined.
    Journal of Materials Science & Technology. 03/2013; 29(3):273–278.
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    ABSTRACT: We study the control of spontaneous emission in a three-level V-type atom that is coupled by a static magnetic field in photonic crystals. We find that by changing the position of the upper band edge and Larmor frequency of the magnetic field, control of the steady-state behavior of spontaneous emission can be achieved. As the transition frequencies move from outside the band gap to inside, the structure of the spectral line changes from a two-peak structure to a single-peak structure, and then to a non-Lorentzian shape. With the increase of the Larmor frequency of the magnetic field, when both transition frequencies are outside the photonic band gap, the partial spectral line disappears; however, when both frequencies are inside the band gap, the non-Lorentzian shape is replaced by a Lorentzian shape. These phenomena arise from the fact that the corresponding transition frequency is pushed into or out of the band gap.
    Laser Physics 01/2013; 23(2):025203. · 1.03 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 01/2013; 114(17):173107-173107-5. · 2.21 Impact Factor
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    ABSTRACT: The redshift (∼54 meV) of the photoluminescence (PL) peak energy of blue InGaN/GaN light-emitting diodes exposed to 60Co γ-rays was observed. Time-resolved PL indicates that the PL radiative time increases along with irradiation does. The temperature-dependent PL and photoreflectance techniques show that γ-ray irradiance leads to higher carrier localization energies and larger Stokes' shift, respectively. These facts suggest that the redshifts of the PL peak emission introduced by γ-ray irradiance mainly originated from the enhancement of indium fluctuation. The cathodoluminescent images of the samples before and after γ-ray irradiation are compared to verify the results.
    Journal of Applied Physics 12/2012; 112(12). · 2.21 Impact Factor
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    ABSTRACT: In this paper, experimental results of polarity inversion and coupling of laser beam induced current for As-doped long-wavelength HgCdTe pixel arrays grown on CdZnTe are reported. Models for the p-n junction transformation are proposed and demonstrated using numerical simulations. Simulation results are shown to be in agreement with the experimental results. It is found that the deep traps induced by ion implantation are very sensitive to temperature, resulting in a decrease of the quasi Fermi level in the implantation region in comparison to that in the Hg interstitials diffusion and As-doped regions. The Hg interstitial diffusion, As-doping amphoteric behavior, ion implantation damage traps, and the mixed conduction, are key factors for inducing the polarity reversion, coupling, and junction broadening at different temperatures. The results provide the near room-temperature HgCdTe photovoltaic detector with a reliable reference on the junction reversion and broadening around implanted regions, as well as controlling the n-on-p junction for very long wavelength HgCdTe infrared detector pixels.
    Applied Physics Letters 11/2012; 101(18). · 3.52 Impact Factor

Publication Stats

571 Citations
227.00 Total Impact Points

Institutions

  • 2005–2014
    • 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
  • 2013
    • 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
    • Shanghai University
      • Department of Physics
      Shanghai, Shanghai Shi, China
  • 2004–2013
    • Fudan University
      • Institute of Modern Physics
      Shanghai, Shanghai Shi, China
  • 2012
    • Queensland University of Technology
      Brisbane, Queensland, Australia
  • 2008–2012
    • Chinese Academy of Sciences
      • • National Laboratory for Infrared Physics
      • • Key Laboratory of Semiconductor Materials
      Peping, Beijing, China
    • Peking Union Medical College Hospital
      • Department of Rheumatology
      Beijing, Beijing Shi, China
  • 2011
    • Xiangtan University
      Siangtan, Hunan, China
  • 2008–2011
    • Harbin Institute of Technology
      • Department of Physics
      Charbin, Heilongjiang Sheng, China
  • 2009
    • University of Queensland 
      • Centre for Microscopy and Microanalysis
      Brisbane, Queensland, Australia
  • 2006–2009
    • Northeast Institute of Geography and Agroecology
      • • Key Laboratory of Semiconductor Materials
      • • Institute of Physics
      • • National Laboratory for Infrared Physics
      Beijing, Beijing Shi, China
    • University of Utah
      • Department of Electrical and Computer Engineering
      Salt Lake City, Utah, United States
    • Technical Institute of Physics and Chemistry
      Peping, Beijing, China
  • 2007
    • Nanjing University
      • Department of Physics
      Nanjing, Jiangsu Sheng, China
  • 2005–2006
    • The Hong Kong University of Science and Technology
      • Department of Physics
      Chiu-lung, Kowloon City, Hong Kong