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.


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Xie W.,Henan University of Technology | Zhao L.,Henan University of Technology
Energy Conversion and Management | Year: 2014

The main aim of this research is to develop efficient and environmentally benign heterogeneous catalysts for biodiesel production. For this purpose, heterogeneous CaO-MoO3-SBA-15 catalysts were prepared by incipient impregnation method, and the prepared catalyst was tested for the transesterification process of soybean oil to produce biodiesel. Various techniques such as X-ray diffraction, Fourier transform infrared spectra, X-ray photoelectron spectroscopy, scanning electron microscopy and thermo gravimetric analysis were employed for the characterization of the solid catalyst. The catalytic activity was dependent on the calcination temperature and loading amount of calcium and molybdenum oxides. The solid catalyst, with the CaO-MoO3 loading of 40% and calcined at 823 K, showed the best catalytic activity. The effect of methanol/oil molar ratio, reaction time, catalyst loading and catalyst stability was investigated. By using a 6 wt.% of catalyst with methanol/oil molar ratio of 50:1 at reflux of methanol, the oil conversion of 83.2% after 50 h of reaction, could be achieved over the solid catalyst. The catalyst can be easily recovered and reused without significant loss of activity. © 2013 Elsevier Ltd. All rights reserved.


He X.Y.,Henan University of Technology | Li R.,Henan University of Technology
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2014

Dispersion properties and field distributions of graphene supported transverse magnetic (TM) and transverse electric (TE) surface plasmon (SP) modes in air-graphene-SiO 2-Si structures have been investigated. The results show that graphene-based TM (TE) SPs are bound (lossy) modes, which decay into the air in the range of tens of micrometers (several thousand micrometers). In addition, when the thickness of the SiO2 layer is in the range of 200-300 nm, the influence of the Si substrate on the dispersion property is significant (negligible) for the TM (TE) modes. Furthermore, the effective indexes of the graphene TM (TE) modes increase with the increase (decrease) of the frequency. Compared with the traditional metal-based structures, graphene-based TM mode exhibits a better confinement but with a larger loss. The presented results are useful for the design of compact graphene-based optoelectronic devices. © 2013 IEEE.


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.


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.


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.


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.


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.


Zhang Z.-Q.,Henan University of Technology
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2011

In the two-quark model supposition for the meson a0(1450), which can be viewed as either the first excited state (scenario I) or the lowest lying state (scenario II), the branching ratios and the direct CP-violating asymmetries for decays B-→a00(1450)K* -, a0-(1450)K*0 and B̄0→ a0+(1450)K*-, a00(1450)K̄ *0 are studied by employing the perturbative QCD factorization approach. We find the following results: (a) For the decays B -→a0-(1450)K*0, B̄0→ a0+(1450)K*-, a00(1450)K̄ *0, their branching ratios in scenario II are larger than those in scenario I about one order. So it is easy for the experiments to differentiate between the scenario I and II for the meson a0(1450). (b) For the decay B-→a00(1450)K*-, due to not receiving the enhancement from the K*-emission factorizable diagrams, its penguin operator contributions are the smallest in scenario II, which makes its branching ratio drop into the order of 10 -6. Even so, its branching ratio in scenario II is still larger than that in scenario I about 2.5 times. (c) Even though our predictions are much larger than those from the QCD factorization results, they are still consistent with each other within the large theoretical errors from the annihilation diagrams. (d) We predict the direct CP-violating asymmetry of the decay B -→a0-(1450)K*0 is small and only a few percent. © 2011 American Physical Society.


Xie W.,Henan University of Technology | Zhao L.,Henan University of Technology
Energy Conversion and Management | Year: 2013

The main objective of this work was to develop an environmentally benign process for the production of biodiesel by using a stable solid base catalyst. To this purpose, different heterogeneous CaO-SnO2 catalysts have been prepared by means of impregnation methods. Various techniques such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric and differential thermal analysis (TG-DTA), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were applied for the catalyst characterization. The transesterification of soybean oil with methanol, to produce biodiesel, was carried out under batch conditions at refluxed methanol over the CaO-SnO2 catalysts. The catalytic activity is found to be highly dependent on the Ca/Sn ratio and calcination temperature. The solid catalyst with the Ca/Sn molar ratio of 4:1 and calcined at a temperature of 973 K, performed the best activity, reaching the conversion to methyl esters of 89.3% after 6 h of reaction at methanol reflux temperature (343 K) when a methanol/oil molar ratio of 12:1 and catalyst dosage of 8 wt.% were employed. Further, the solid catalyst is proved to be stable and durable for the transesterification reaction. © 2013 Elsevier Ltd. All rights reserved.


Zhang H.,Henan University of Technology
Mathematical and Computer Modelling | Year: 2012

Many researchers have proposed lots of 2-tuple linguistic models and applied them to multiattribute group decision making (MAGDM) problems. Based on the definition of an interval 2-tuple linguistic variable given by Lin et al. in 2005 [28], this paper puts forward the interval-valued 2-tuple linguistic variable and introduces its score and accuracy functions for comparison between interval-valued 2-tuples. In addition, some aggregation operators of interval-valued 2-tuples, together with their properties, are introduced. Finally, two numerical examples are presented to illustrate the application of proposed aggregation operators in MAGDM. The results indicate that the interval-valued 2-tuple expresses preferences of decision maker more naturally than 2-tuples and aggregation operators proposed can easily aggregate the interval-valued 2-tuple information denoted by different multi-granularity linguistic term sets. © 2012 Elsevier Ltd.

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