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  • 1
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    A Study on Wet and Dry Tensile Properties of Wood pulp/Lyocell Wetlace Nonwovens (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-11-02
    Description: A new biodegradable wood pulp/Lyocell moist wipe had been developed, which made from wetlaid/spunlace(wetlace) technology. The dry and wet tensile curve characteristics were described and the relationship between dry and wet strength in both machine direction (MD) and cross-machine direction (CD) were investigated. The results indicate that the fabricated wetlace materials are composed of the entanglements and cohesions of wood pulp/Lyocell fibres. The modulus and tensile strength of the materials were obviously decreased in wet state, and the tensile curves in the dry and wet state both can be divided into two parts. It is noted that there exists a high linear correlation between the dry and wet strength in MD or CD. Meanwhile, the diminished amplitude of wet strength in CD is larger than that of wet strength in MD and the relationship fluctuation between the wet and dry strength in CD is significantly higher than that in MD.
    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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    Influence of blade angle distribution along leading edge on cavitation performance of a centrifugal pump (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-01-16
    Description: The influence of blade angle distribution along leading edge on cavitation performance of centrifugal pumps is analysed in the present paper. Three sets of blade angle distribution along leading edge for three blade inlet angles are chosen to design nine centrifugal pump impellers. The RNG k- ##IMG## [http://ej.iop.org/icons/Entities/epsilon.gif] {epsilon} turbulence model and the Zwart-Gerber-Belamri cavitation model are employed to simulate the cavitation flows in centrifugal pumps with different impellers and the same volute. The numerical results are compared with the experimental data, and the comparison proves that the numerical simulation can accurately predict the cavitation performance of centrifugal pumps. On the basis of the numerical simulations, the pump head variations with pump inlet pressure, and the flow details in centrifugal pump are revealed to demonstrate the influence of blade an...
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
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    Experiment and numerical simulation of cavitation performance on a pressure-regulating valve with different openings (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-01-16
    Description: As a kind of widely used device in pipe system for pressure and flow rate regulating, the valve would experience cavitation in the case when a sharp pressure drop occurs, which will induce the energy loss, noise and vibration of pipeline system, and even operational accidents. The experiment on flow resistance coefficient of a DN600 pressure-regulating valve under operation conditions from 0% to 100% openings is conducted. Based on the RNG k-e turbulence model and the Rayleigh-Plesset cavitation equation, a set of computational model is developed to simulate the turbulent flow in the valve under operational conditions from 0% to 100% openings. The computational results of flow resistance coefficient are compared to the experimental data. And the numerical simulation is employed to predict the cavitation performance of the valve at different inlet flow conditions. The transient cavitating flow is calculated to reveal the time evolution of cavitation in the valve.
    Print ISSN: 1757-8981
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 4
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    A reflectance spectra model of heavy metal stressed leaves: advances in the PROSPECT model adding specific absorption coefficients of heavy metal ion (2014)
    Institute of Physics (IOP)
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    Publication Date: 2014-03-19
    Description: This article aims to investigate the reflectance model of heavy metal copper stressed crop. Forty-six groups of copper-treated leaves were measured during a laboratory experiment in order to obtain the leaf biochemical component information and its corresponding scanning electron microscopy image. Then a new reflectance spectral model was developed on the basis of the classical broadleaf radiative transfer model-PROSPECT. Comparing with the PROSPECT model, new models mainly consider adding specific absorption coefficient of copper ion. The scattering process is described by a refractive index (n) and a leaf structure parameter (N). Absorption is modeled using pigment concentration, water content, dry matter content, copper ion contamination and the corresponding specific spectral absorption coefficients (K ab , K w , K d , K Cu ). Thus, reflectance spectral modeling is an inversion procedure to calculate the above 6 parameters accurately. To v...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 5
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    Impacts of climate change on hydropower development and sustainability: a review (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-07-31
    Description: The impacts of climate change on hydropower development are complex, often interactive, issues. Many studies have already focused on climate change impacts on the hydrologic cycle. This paper downsizes the analysis and focuses on water resources for power generation. The concentration is on a review of the impacts of climate change on hydropower development from three different spatial scopes; i.e., global, national and regional scales. Climate change is a global phenomenon; however, the effects of climate change on hydropower generation are not uniform over different spatial scales. The diverse effects depend on such factors as local hydrological conditions and geographic features. This demonstrates the necessity of drilling down the analysis of climate change impacts to the sub-national, or local scale of hydropower generation. This paper characterizes both direct and indirect factors of climate change impacts on hydropower, and, elaborates on how several supporting elements c...
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    Topics: Geography , Geosciences , Physics
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  • 6
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    Flexible Carbon Cloth Based PPy-Ag Nanoparticles Composite Film for Supercapacitors (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-08-09
    Description: Polypyrrole-Ag nanoparticles composite film was prepared based on flexible carbon cloth as substrate using silver nitrate as oxidizing agent through simple one-pot chemical synthesis method. The composite sample was characterized by scanning electron microscopy, X-ray diffraction, cyclic voltammetry and galvanostatic charge-discharge techniques. The electrochemical measurements showed such an electrode had a specific capacitance of 257 F g −1 and good cycle stability at a discharge current density of 1 A g −1 . The composite electrode also had a wide working potential window, which can be applied in the field of power energy storage devices.
    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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    Characteristics of Hydrogen and Oxygen Stable Isotopes of Different Water Bodies in Peixian Coal Mining Subsidence Area in Jiangsu Province, China (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-06-05
    Description: As a result of long-term well mining activities, a large area of coal mining subsidence has formed in the mining area in Peixian County, Jiangsu province, an important energy base in eastern China. This subsidence filled by water made the local water cycle become more complicated and severe geological hazards easy to occur. Oxygen-stable isotope, playing an important role in the study on water-cycle mechanism, is a substantial way to track different sources of water in nature. In this study, we took samples from different water bodies of soil water, the surface waters (river, lake and collapse pit) and the groundwater (well water) seasonally in a year. The analyses of δD and δ 18 O were further conducted to trace the transforming relationships between these water bodies. The findings are as follows: (i) precipitation is the main charge source of soil water, along with significant evaporation processes; (ii) with soil depth increasing, δD and δ 18 O of soil wate...
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    Topics: Geography , Geosciences , Physics
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  • 8
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    Multi-Source Remote Sensing Heterogeneous Data Management Application Based On Metadata (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-08-08
    Description: The characteristics of remote sensing data are large amount, multi-source, heterogeneous and distributed storage, which have caused the difficulty of data integration and greatly restricts its application. Based on the characteristics of metadata information of remote sensing data, this paper constructs the distributed remote sensing metadata integration criterion and realizes the unified format conversion of multi-source remote sensing metadata. Secondly, it designs amulti-source satellite data fast access method based on XML to improve the capability of rapid updating of data resources of satellite data application system in a single direction; Finally, the feasibility and practicability of the research results are verified by taking the integrated water resources management and emergency demonstration system in the river basin as an example.
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 9
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    Research on Preparation and Performance of Epoxy Resin-Boron Nitride Thermal-Conductive Composite (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-08-08
    Description: Owning to its excellent mechanical and electrical properties of epoxy resin, epoxy resin is widely used in electronic packaging field. However, thermal conductivity of ordinary epoxy resin is only 0.2W/m·K, heat is easy to be accumulated during operation of components, the stress will increase and a series of questions (e.g. cracking of product) would be caused then. Therefore, enhancing of thermal conductivity of epoxy resin is a focal research point in electronic packaging material field. In this study, hexagonal boron nitride was used as the filler, epoxy resin was used as the matrix, the hexagonal boron nitride thermal-conductive insulating composite of different mass fraction was prepared, and the impact of different boron nitride mass fraction on performance of composite was researched. It was discovered during the research that adding of boron nitride (h-BN) filler enhanced thermal conductivity of composite effectively. When mass fraction of h-BN reached to 15%, thermal c...
    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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  • 10
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    Comparison of residual stress before and after shot peening on the surface of a Ti-6Al-4V titanium alloy by μ-X360n equipment (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-09-01
    Description: This comparison study is on the residual stress of a Ti-6Al-4V titanium alloy before and after shot peening. The Ti-6Al-4V titanium alloy is one of the most widely used materials due to a very good comprehensive performance. Testing the titanium alloy reveals that it adopts a Cu Κα for the target material because it has a strong diffraction peak under the crystal surface (213). The equipment used is the two-dimensional surface diffraction method to test the stress of the Ti-6Al-4V titanium alloy. The two-dimensional surface agent contains a detector and the detector consists of a complete probe. The core component of the detector is greater than 2 inches in diameter and the size of the detector determinesits ability to collect the diffraction signal; the greater the acquisition ability, the stronger it is. This piece of equipment is currently the most advanced full two-dimensional piece of equipment. The residual stress in the x-direction on the upper surface of the Ti-6Al-4V ti...
    Print ISSN: 1757-8981
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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