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Article
Numerical Simulation of Flow Field in Large Bottom-Blown Furnace Under Different Scale-Up Criteria
In this paper, the fluid dynamics software Fluent is used to simulate the gas–liquid two-phase flow characteristics of a bottom-blown furnace under four different scale-up criteria. The results show that most ...
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Article
Open AccessResearch on prestressed loading strut of cable supported portal frame
In this study, a novel type of loading strut device is presented, which is introduced in portal frame external prestressing reinforcement and used to constitute a cable-supported portal frame structural system...
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Article
Flatness maintenance and roughness reduction of silicon mirror in chemical mechanical polishing process
As an important optical component in laser system, silicon mirror surface is required to have micron-level flatness and subnanometer-level roughness. The research concentrates on how to improve roughness as fa...
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Article
Influence of crystal structure on friction coefficient of ZnO films prepared by atomic layer deposition
In this work, the influence of crystal structure on the friction coefficient of zinc oxide (ZnO) films was studied. The ZnO films were deposited on a Si (100) substrate using an atomic layer deposition process...
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Article
Numerical predictions and stability analysis of cavitating draft tube vortices at high head in a model Francis turbine
Draft tube vortex is one of the main causes of hydraulic instability in hydraulic reaction turbines, in particular Francis turbines. A method of cavitation calculations was proposed to predict the pressure flu...
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Article
Nanowear pretreatment of AFM tips for reasonable friction force
In a nanoscale friction test, wear of an atomic force microscope (AFM) tip is inevitable. The shape of the worn tip influences the friction force measured. In order to eliminate the influence, nanowear pretrea...
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Article
Excellent tribological behavior of hexadecylphosphonic acid films formed on titanium alloy
Titanium alloy (Ti6Al4V) surfaces are generally modified to achieve some specific surface properties to satisfy requirements of clinical medicine. In our work, hexadecylphosphonic acid (HDPA) films were succes...
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Article
Achievement of a near-perfect smooth silicon surface
During the ultra large scale integration (ULSI) process, the surface roughness of the polished silicon wafer plays an important role in the quality and rate of production of devices. In this work, the effects ...
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Article
Superlubricity of Si3N4 sliding against SiO2 under linear contact conditions in phosphoric acid solutions
Superlubricity phenomena, which were previously achieved merely under point contact conditions, have been observed under the linear contact condition between the silicon nitride (Si3N4) cylinder and the silica (S...
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Article
A comparative study between graphene oxide and diamond nanoparticles as water-based lubricating additives
The tribological properties of graphene oxide (GO) nanosheets and modified diamond (MD) nanoparticles with excellent water-solubility were investigated. GO nanosheets were synthesized using carbon fibers with ...
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Article
Preparation of poly (N-isopropylacrylamide) brush bonded on silicon substrate and its water-based lubricating property
The poly (N-isopropylacrylamide) brush was covalently bonded on an initiator-coated silicon wafer via surface-initiated atom transfer radical polymerization. The polymer brush was (76.2±0.1) nm in thickness (b...
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Article
Modification on the tribological properties of ceramics lubricated by water using fullerenol as a lubricating additive
It is necessary to modify the running-in process for the application of ceramics using water as a lubricant in real conditions because ceramics sliding in water are characterized by a running-in period with se...
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Article
An optimization method on runner blades in bulb turbine based on CFD analysis
In this paper an optimization method of the runner blades in a bulb turbine based on CFD analysis is proposed. In the method the main scales of the turbine including guide vane, runner and draft are maintained...
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Article
PIV measurement on internal instantaneous flows of a centrifugal pump
In this paper, the internal flow field in a centrifugal pump working at the design flow rate operating condition has been measured using the particle image velocimetry (PIV) technique with the fluorescent part...
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Article
An experimental study on self-output-control characteristics of micro downwind rotor with coning soft blades
In this short paper, we have treated the aerodynamic performance of micro downwind rotor with coning soft blades experimentally. The test wind rotor has the tip diameter of 1.5 m and three two-dimensional NACA...
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Article
Viscous liquid sloshing dam** in cylindrical container using a volume of fluid method
Liquid sloshing is a kind of very complicated free surface flow and exists widely in many fields. In order to calculate liquid sloshing dam** precisely a volume of fluid method based on finite volume scheme ...
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Article
Numerical simulation of pressure fluctuation in Kaplan turbine
As it is almost impossible to carry out the prototype hydro-turbine experiment before the power plant is built up, rational prediction of pressure fluctuations in the prototype turbine is very important at the...
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Article
Study on the spectral response of Brassica Campestris L. leaf to the copper pollution
Brassica Campestis L. was cultivated in the soil at the laboratory. The red edge, the visual spectrum and the near-infrared spectrum of Brassica Campestis L. leaf were used to explore the spectral response of Bra...
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Article
Influence of stresses on martensitic transformation in ferromagnetic shape memory Ni50Mn19Fe6Ga25 ribbons
The influence of stresses on martensitic transformation in Ni50Mn19Fe6Ga25 melt-spun ribbons was studied. X-ray diffraction examination shows that the ribbon has a pure cubic L21 phase at room temperature and tha...