Hebei University of Technology

Hebei, China

Hebei University of Technology is a public university whose main campus lies in the Guangrong Dao neighborhood of the Hongqiao District in Tianjin, China. It is the first institute of technology in modern Chinese education history. It is among the first group of institutions of higher learning in the national “211-Project” to which priority is given in construction. In order to carry out the “21st Century Education Revitalizing Action Plan”. Wikipedia.

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Jin P.,Hebei University of Technology | Tang C.,Hebei University of Technology | Chen Z.,University of Puerto Rico at San Juan
Coordination Chemistry Reviews | Year: 2014

Metal carbide clusterfullerenes (MCCFs), which trap two carbon atoms together with metal atom(s) inside the fullerene cage, are a novel branch of endohedral metallofullerenes (EMFs). This review presents an exhaustive survey of recent research progress in MCCFs. After a detailed enumeration of the structural establishments of representative MCCFs, their novel structures, intriguing cluster-cage interplays, fascinating properties, and potential applications are highlighted. Moreover, a variety of new MCCF members are suggested for future identification. © 2013 Elsevier B.V.

Zhang Z.H.,Hebei University of Technology
Optics and Lasers in Engineering | Year: 2012

Full-field fringe projection techniques have been widely studied in academia and applied in industrial fields because of the advantages of non-contact operation, fast full-field acquisition, high accuracy and automatic data processing. Phase data map is calculated from one or multiple captured fringe pattern images on the measured object surface, which are called as single-shot and multiple-shot 3D measurement methods. Although multiple-shot methods can give highly accurate data for measuring static objects, it could be degraded by disturbance, such as vibration and environmental noises between gap of image shot. However, single-shot methods are insensitive to vibrational noises because of capturing only one image. Therefore, various single-shot methods have been actively researched recently with the advent of new imaging and projecting devices. This paper reviews the single-shot 3D shape measurement techniques by projecting and capturing one fringe pattern image on the object surface, the wrapped phase demodulation algorithms from one captured image. The challenging problems and future research directions are discussed to advance single-shot 3D shape measurement techniques. © 2012 Elsevier Ltd. All rights reserved.

Min C.-H.,Hebei University of Technology
Journal of Power Sources | Year: 2010

A three-dimensional, two-phase and non-isothermal model of a proton exchange membrane fuel cell (PEMFC) based on the previously developed model is established using the two-fluid method. This two-phase model considers the liquid water transport in both cathode and anode sides and accounts for the intrinsic heat transfer between the reactant fluids and the solid matrices. The latent heat of water condensation/evaporation is considered in the present model. The numerical results demonstrate that the lower cathode humidity is beneficial for cell performance. In the anode side, the water vapor can be condensed at high current density because the water vapor transport is less than the hydrogen consumption rate. Near the catalyst layer, the reactant fluid temperature is higher than the solid matrix temperature, and far from the catalyst layer, the temperature difference between the reactant fluid and the solid matrix decreases. Near the channel, the reactant fluid temperature is lower than the solid matrix temperature. © 2009 Elsevier B.V. All rights reserved.

Li P.,Hebei University of Technology | Wang Y.,Hebei University of Technology | Li H.,Hebei University of Technology | Calzaferri G.,University of Bern
Angewandte Chemie - International Edition | Year: 2014

Stopper molecules attached to nanozeolite L (NZL) boost the luminescence of confined Eu3+-β-diketonate complexes. The mechanism that is responsible was elucidated by comparing two diketonate ligands of different pKa and two aromatic imines, and by applying stationary and time resolved spectroscopy. The result is that the presence of the imidazolium based stopper is favorable to the sustainable formation of Eu3+-β- diketonate complexes with high coordination by decreasing the proton strength inside the channels of NZL. A consequence is that strongly luminescent transparent films can be prepared using aqueous suspension of the stopper modified composites. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

A method of cleaning multilayer copper wirings in ultra large scale integrated circuits after chemical-mechanical polishing, the method including: a) preparing a cleaning solution, the cleaning solution including between 0.1 and 5 wt. % of a nonionic surfactant, between 0.1 and 7 wt. % of a corrosion inhibitor, and between 0.1 and 0.6 wt. % of a chelating agent in deionized water; b) adjusting the pH value of the cleaning solution to between 7 and 8 using triethanolamine; c) during the production of ULSI, after the chemical-mechanical polishing step, washing the multilayer copper wirings with the cleaning solution at a flow rate of between 500 and 5000 mL/min for between 0.5 and 1 min; d) ultrasonic washing in the presence of deionized water under following conditions: 60 Hz frequency of ultrasound, 50 C. temperature, and between 0.5 and 1 min ultrasonic time; and e) drying the multilayer copper wirings.

A method of cleaning tungsten plug surfaces in ultra large scale integrated circuits after chemical-mechanical polishing, the method including: a) preparing a cleaning solution by mixing deionized water, between 15 and 30 g/L of an active agent with respect to the deionized water, between 5 and 20 g/L of a chelating agent with respect to the deionized water, and between 1 and 60 g/L of a corrosion inhibitor with respect to the deionized water; b) after alkaline chemical-mechanical polishing, washing the tungsten plug surfaces using the cleaning solution at a flow rate of between 1000 and 4000 g/min for between 30 s and 3 min.

A method of cleaning copper material surfaces in ultra large scale integrated circuits after polishing, the method including: a) mixing and stirring between 1 and 4 wt. % of a surfactant, between 0.5 and 3 wt. % of a chelating agent, between 0.1 and 5 wt. % of a corrosion inhibitor, and deionized water, to yield a water soluble cleaning solution with pH value of between 7.4 and 8.2; and b) washing the copper material surfaces using the cleaning solution after alkaline chemical-mechanical polishing under following conditions: between 2000 and 3000 Pa of pressure; between 1000 and 5000 mL/min of flow rate:; and at least between 0.5 and 2 min of washing time.

CITIC Dicastal CO. and Hebei University of Technology | Date: 2016-03-15

The present invention provides an aluminium alloy refiner. The aluminium alloy refiner is characterized by comprising 7 to 10 parts of Ti, 2 to 3 parts of B and the balance of Al by weight, for example, 8 parts of Ti, 3 parts of B and 89 parts of Al by weight. The aluminium alloy refiner is prepared by rapid solidification. After the refiner is added to A356.2 aluminium alloy, the grain size of the alloy is significantly reduced than that of the aluminium alloy treated by a conventional refiner. Moreover, the solubility of metals in liquid may be increased due to rapid solidification, such that the refiner is more easily absorbed by the aluminium alloy melt after being added to the aluminium alloy.

CITIC Dicastal CO. and Hebei University of Technology | Date: 2016-03-16

The invention provides a method of refining aluminum alloy, which is characterized in that aluminum-based nanometer quasicrystal alloy is used as an aluminum alloy refiner to refine the aluminum alloy; the aluminum-based nanometer quasicrystal alloy does not comprise Si, Fe or Cr; the aluminum-based nanometer quasicrystal alloy consists of (1) Al; (2) Mn and (3) La and/or Ce. The refiner selected in the invention is rare earth-containing alloy which has a strong refinement ability on the aluminum alloy, and is nanometer quasicrystal; after adding the rare earth-containing alloy to melt, the element distribution of the rare earth-containing alloy is more uniform than that of traditional alloy; and nanometer quasicrystal particles substantially increase the number of heterogeneous nucleation particles and improve the grain refinement effect of the aluminum alloy.

Mi Y.-J.,Hebei University of Technology
International Journal of Theoretical Physics | Year: 2012

We study the dynamics of classical correlation and quantum discord of two-qubit system interacted with the thermal reservoir. Special attention is paid to the difference between the entanglement and quantum discord when considering the influences of the nonzero mean photon number and quantum fluctuation of the vacuum. It is shown that in the same range of the physical parameters, the factors leading to the entanglement sudden death only accelerates the decay of quantum discord, and the quantum discord can last for an infinite period when the entanglement disappears. So the quantum discord is more robust than entanglement under this decoherence environment, and quantum discord is a more general measure of quantum correlation than entanglement. © 2011 Springer Science+Business Media, LLC.

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