Entity

Time filter

Source Type

Henan, China

Henan University of Technology , formerly known as Zhengzhou Institute of Technology and Zhengzhou Polytechnic Institute, is a public university in Zhengzhou, the capital city of Henan province. It was established in 1956. Wikipedia.


Zhang X.,Henan University of Technology | Zhou J.,Huazhong University of Science and Technology
Mechanical Systems and Signal Processing | Year: 2013

This study presents a novel procedure based on ensemble empirical mode decomposition (EEMD) and optimized support vector machine (SVM) for multi-fault diagnosis of rolling element bearings. The vibration signal is adaptively decomposed into a number of intrinsic mode functions (IMFs) by EEMD. Two types of features, the EEMD energy entropy and singular values of the matrix whose rows are IMFs, are extracted. EEMD energy entropy is used to specify whether the bearing has faults or not. If the bearing has faults, singular values are input to multi-class SVM optimized by inter-cluster distance in the feature space (ICDSVM) to specify the fault type. The proposed method was tested on a system with an electric motor which has two rolling bearings with 8 normal working conditions and 48 fault working conditions. Five groups of experiments were done to evaluate the effectiveness of the proposed method. The results show that the proposed method outperforms other methods both mentioned in this paper and published in other literatures. © 2013 Elsevier Ltd. Source


We have developed an ultra-sensitive electrochemical DNA biosensor by assembling probe ssDNA on a glassy carbon electrode modified with a composite made from molybdenum disulfide, graphene, chitosan and gold nanoparticles. A thiol-tagged DNA strand coupled to horseradish peroxidase conjugated to AuNP served as a tracer. The nanocomposite on the surface acts as relatively good electrical conductor for accelerating the electron transfer, while the enzyme tagged gold nanoparticles provide signal amplification. Hybridization with the target DNA was studied by measuring the electrochemical signal response of horseradish peroxidase using differential pulse voltammetry. The calibration plot is linear in the 5.0 × 10-14 and 5.0 × 10-9 M concentration range, and the limit of detection is 2.2 × 10-15 M. The biosensor displays high selectivity and can differentiate between single-base mismatched and three-base mismatched sequences of DNA. The approach is deemed to provide a sensitive and reliable tool for highly specific detection of DNA. [Figure not available: see fulltext.] © 2014 Springer-Verlag Wien. Source


He X.,Henan University of Technology
Journal of the Optical Society of America B: Optical Physics | Year: 2010

The influence of the nonlocal effect on the optical properties of terahertz waves propagating along a metallic nanowire has been investigated, taking into account the effects of the composed materials, metal wire radii, and radiation frequencies. The results manifest that the nonlocal effect has significant influence on the propagation properties of terahertz nanowire surface waves. The contour results show that as metal wire radii increase, the phase velocity increases, and the attenuation losses decrease. On condition that the metallic nanowire radius is small (tens of nanometers), the attenuation losses of the surface waves decrease with the increasing of frequency. The numerical results are very useful for the development of nanoplasmonic devices in the fields of terahertz spectroscopy, biological sensors, and detectors. © 2010 Optical Society of America. Source


Zhang Z.-Q.,Henan University of Technology
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2010

In the two-quark model supposition for K0*(1430), which can be viewed as either the first excited state (scenario I) or the lowest lying state (scenarioII), the branching ratios and the direct CP-violating asymmetries for decays B̄s0→K0*0(1430)φ, K0*0(1430)ω, K0*0(1430)ρ0, K0*+(1430)ρ⊃- are studied by employing the perturbative QCD factorization approach. We find the following results: (a)Enhanced by the color allowed tree amplitude with large Wilson coefficients a1=C2+C1/3, the branching ratio of B̄s0→K0*+(1430)ρ⊃- is much larger than those of the other three decays and arrives at (3.4-0.7+0.8)×10⊃-5 in scenarioI, even 10⊃-4 order in scenario II, and its direct CP-violating asymmetry is the smallest, around 10%, so this channel might be measurable in the current LHC-b experiments, where a large number (about 1012) of B mesons will be produced per year. These high statistics will make the measurement possible. (b) For the decay modes B̄s0→K0*0(1430)ω, K0*0(1430)ρ0, their direct CP-violating asymmetries are large, but it might be difficult to measure them, because their branching ratios are small and less than (or near) 10⊃-6 in both scenarios. For example, in scenarioI, these values are B(B̄s0→K0*(1430)ω)=(8.2-1.7+1.8) ×10⊃-7, B(B̄s0→K0*(1430)ρ0)=(9.9-2.0+2.1) ×10⊃-7, ACPdir(B̄s0→K0*0(1430)ω)=-24.1-2.5+2.8, ACPdir(B̄s0→K0*0(1430)ρ0)=26.6-2.5+2.5. (c)For the decay B̄s0→K0*(1430)φ, the predicted branching ratios are also small and a few times 10⊃-7 in both scenarios; there is no tree contribution at the leading order, so its direct CP-violating asymmetry is naturally zero. © 2010 The American Physical Society. Source


Zhang Z.-Q.,Henan University of Technology
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2010

In the two-quark model supposition for f0(980) and K0*(1430), the branching ratios and the direct CP-violating asymmetries for decays B ̄0→f0(980)ρ0(ω,), K0*0(1430)ρ0(ω) , K0*-(1430)ρ+ and B-→f0(980)ρ -, K0*0(1430)ρ-, K0*-(1430)ρ0(ω) are studied by employing the perturbative QCD factorization approach. we find the following results: (a) if the scalar meson f0(980) is viewed as a mixture of ss̄ and (uū+dd̄)/√2, the branching ratios of the b→d transition processes B̄0→f0(980)ρ0(ω,̈) and B-→f0(980)ρ- are smaller than the currently experimental upper limits, and the predictions for the decays B ̄0→f0(980)ω, B-→f0(980)ρ - are not far away from their limits; (b) in the b→s transition processes B→K0*(1430)ρ(ω), the branching ratio of B ̄0→K0*0(1430)ρ0 is the smallest one, at the order of 10-7 by treating K0*(1430) as the lowest lying state, about 4.8×10-6 by considering K0*(1430) as the first excited state; (c) the direct CP-violating asymmetries of decays B→f0(980) ρ(ω) have a strong dependence on the mixing angle θ: they are large in the range of 25°<θ<40°, and small in the range of 140°<θ<165°, while the direct CP-violating asymmetry amplitudes of decays B→K0*(1430)ρ(ω) are not large in the two kinds of state supposition for K0*(1430) and most of them are less than 20%. © 2010 The American Physical Society. Source

Discover hidden collaborations