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  • 1
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    Research on preparation of HFCVD diamond coated milling cutter and stone cutting performance (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-09-20
    Description: The study is on the properties of diamond coating prepared on milling cutter and its effect on the cutting performance of stone. The method of hot filament chemical vapour deposition HFCVD was used to deposit diamond film coatings on the surface of the cemented carbide milling cutter. The surface morphology, composition and grain orientation of the diamond films on the cemented carbide milling cutter were analysed by using scanning electron microscopy, Raman spectroscopy and X-ray diffraction; the prepared diamond coated milling cutter was used to process the stone experiment, and the cutting performance of the diamond layer cutter with different carbon sources was analysed. The prepared diamond-coated cutter has a small diamond grain size on the surface, typically crystal face disappears, and the grain orientation presents nano-crystalline diamond. Compared to the uncoated cutter, the surface roughness decreases. After coating, the diamond coating on the surface of ...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
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    Does safety climate mediate the relationship between institutio nal environment and employee safety behavior? (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-06
    Description: The purpose of this paper is to explain the impact of institutional environment on employee safety behaviors, which helps to organize research on the safety climate. A set of assumptions was put forward to prove that the healthier the institutional environment is, the better the employees’ safety behavior. At the same time, we assume that the dimensions of the institutional environment will affect the safety climate. In particular, other assumptions pertain to safety climate mediated the relation between institutional environment dimensions and employee safety behavior. Through a questionnaire survey of 161 employees in manufacturing enterprises, we obtained a set of factors that measure the enterprise’s institutional environment and employees’ safety behavior in a specific safety climate. The empirical results show that: 1) The good institutional environment has a positive impact on employees’ safety behavior; 2) The healthy institutional environment significantly enhances the ...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
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    Balanced design and commissioning of a 500W/4.5K helium refrigerator and its liquefier (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-12-30
    Description: A 500W/4.5K helium refrigerator for ADS (Accelerator Driven Subcritical) project of CAS (Chinese Academy of Sciences) has been designed. The functional requirements and process analysis of this helium refrigerator are described. Based on the regulation of the high pressure, a balanced design between refrigeration capacity and liquefaction capacity for equal Carnot work with the same high efficiencies is presented. The constraints of components and operation strategies in refrigeration mode and liquefaction mode are discussed. Commissioning results indicated that this 500W/4.5K helium refrigerator can provide 5.74g/s (or 165L/h) liquid helium in liquefaction mode or 550W at 4.5K in refrigeration mode with the respective FOM (Figure of Merit) of 14% or 13.2%. Existing problems were analyzed and discussed through comparing the theoretical calculation and experimental data, and some suggestions are given at the end of this paper.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 4
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    Operational present status and reliability analysis of the upgraded EAST cryogenic system (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-12-30
    Description: Since the first commissioning in 2005, the cryogenic system for EAST (Experimental Advanced Superconducting Tokamak) has been cooled down and warmed up for thirteen experimental campaigns. In order to promote the refrigeration efficiencies and reliability, the EAST cryogenic system was upgraded gradually with new helium screw compressors and new dynamic gas bearing helium turbine expanders with eddy current brake to improve the original poor mechanical and operational performance from 2012 to 2015. Then the totally upgraded cryogenic system was put into operation in the eleventh cool-down experiment, and has been operated for the latest several experimental campaigns. The upgraded system has successfully coped with various normal operational modes during cool-down and 4.5 K steady-state operation under pulsed heat load from the tokamak as well as the abnormal fault modes including turbines protection stop. In this paper, the upgraded EAST cryogenic system including its functiona...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 5
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    The stiffness tailoring of megawatt wind turbine (2013)
    Institute of Physics (IOP)
    Details
    Publication Date: 2013-12-22
    Description: Wind power has developed rapidly in recently years, the wind turbine's blades determine the performance of the device and the power. In this paper, we used integrated tailoring aimed at institutional characteristics of horizontal axis wind turbine with the composite laminated plate theory, then analyzed the composite blades of wind turbine by combining experimental analysis and finite elements method, and finally studied the influences that composite material properties on stiffness tailoring with changes in the number of different layers.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 6
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    Effects of B site doping on electronic structures of InNbO 4 based on hybrid density functional calculations (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-02-03
    Description: In order to improve the photocatalytic activity under visible-light irradiation, we adopted first principle calculations based on density functional theory (DFT) to calculate the electronic structures of B site transition metal element doped InNbO 4 . The results indicated that the complete hybridization of Nb 4d states and some Ti 3d states contributed to the new conduction band of Ti doped InNbO 4 , barely changing the position of band edge. For Cr doping, some localized Cr 3d states were introduced into the band gap. Nonetheless, the potential of localized levels was too positive to cause visible-light reaction. When it came to Cu doping, the band gap was almost same with that of InNbO 4 as well as some localized Cu 3d states appeared above the top of VB. The introduction of localized energy levels benefited electrons to migrate from valence band (VB) to conduction band (CB) by absorbing lower energy photons, realizing visible-light response.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 7
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    Study of a novel phosphorus-containing flame retardant for cotton fabric (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-07-17
    Description: In this paper, a high efficiency FR named HPA was applied to treat cotton fabric. The results of LOI values and vertical flammability test showed that HPA treated cotton fabric had the best flame retardancy (LOI value was 36.0%), when the FR concentration is 50 g/L, and cured at 180°C for 7 min. During the process of holding back the combustion, HPA behaves the excellent properties of FR for cotton fabric.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 8
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    Modelling the transport of oil after a proposed oil spill accident in Barents Sea and its environmental impact on Alke species (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-09-01
    Description: Accidental oil spills can have significant effect on the coastal and marine environment. As the oil extraction and exploration activities increase in the Barents Sea, it is of increasingly importance to investigate the potential oil spill incidents associated with these activities. In this study, the transport and fate of oil after a proposed oil spill incident in Barents Sea was modelled by oil spill contingency and response model OSCAR. The possibility that the spilled oil reach the open sea and the strand area was calculated respectively. The influence area of the incident was calculated by combining the results from 200 simulations. The possibility that the spilled oil reach Alke species, a vulnerable species and on the National Red List of birds in Barents Sea, was analyzed by combining oil spill modelling results and the Alke species distribution data. The results showed that oil is dominated with a probability of 70-100% in the open sea to reach an area in a radius of 20k...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 9
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    Statistical Analysis of Meteorological Disasters in the Jiangsu Power Grid and Prevention Methods (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-11-03
    Description: With the obvious global climate change and the rapid development of an industrial economy in Jiangsu, the number of failures in power equipment caused by meteorological disasters has been increasing every year, especially contamination flashover faults and wind deflection faults. Based on extensive investigation and analysis, this paper conducts a statistical analysis of the temporal and spatial distribution of the typical meteorological conditions in the Jiangsu area. This paper also analyses the effects of the main meteorological disasters and defensive measures that have been taken to prevent them in recent years, and the paper summarizes the characteristics of the faults in a typical case. Finally, the paper gives some overall advice for preventative measures from the perspective of design planning, applications of new technology, disaster warnings and so on. These recommendations may provide an important reference for the design, maintenance and accident prevention for powe...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 10
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    Liquid phase synthesis: preparation of co microspheres by hydrazine reducing method (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-02-14
    Description: The study synthesizes Co microspheres with perfect spherical shape by use hydrazine hydrate as reducing agent to reduce CoCl 2 in alkaline conditions at room temperature, the influence of NaOH addition amount on crystal morphology and structure of cobalt particle were studied. The results show that, under the condition of concentration of NaOH, 0.030g ml -1 and having ethylene glycol as solvent, are the best choice to synthesize Co microspheres, and the grain is smaller, suitable for industrial production. At the condition of less amount of NaOH, cobalt particle's surface is smooth spherical, and with the increase of NaOH, particles will deviate from the spherical morphology and the surface become rough. The first section in your paper
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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