نتایج جستجو برای: walled tubes
تعداد نتایج: 41061 فیلتر نتایج به سال:
in this paper, the radial breathing mode (rbm) frequencies of multi-walled carbon nanotubes (mwcnts) are obtained based on the multiple-elastic thin shell model. for this purpose, mwcnt is considered as a multiple concentric elastic thin cylindrical shells, which are coupled through van der waals (vdw) forces between two adjacent tubes. lennard-jones potential is used to calculate the vdw forc...
Introduction: Polycyclic Aromatic Hydrocarbons (PAHs) belong to one of the groups of persistent organic pollutants (POPs) which are the result of incomplete combustion of organic materials, volcanic eruptions and forest and agricultural fields’ fires in the environment. However, human factors are main source of these pollutions. Nowadays, these compounds are among the main concerns related to t...
Introduction: Benzene is a volatile compound in petroleum products and a major concern is its carcinogenic effects. The purpose of this study was to survey benzene removal ability of multi-walled carbon nano tubes by surface modified with calcium hypochlorite and sodium hypochlorite from aqueous solution. Methods:The removal of benzene was evaluated by aqueous solution by hybrid multi-walled c...
Background: The presence of heavy metals in the environment especially in water supplies have caused many concerns because of their toxicity and non-degradability. Hexavalent Chromium (Cr) is one of the most toxic metals which is used in many industries, so it is essential to remove it from industrial wastewater. In this study, we made a comparison between different adsorption isotherms in the ...
Laser Powder Bed Fusion (LPBF) technologies such as Selective Melting (SLM) are being increasingly considered viable production routes. This paradigm change demands an in-depth understanding of the fabrication process and variables, previous studies have shown that energy density calculation alone is insufficient, because parts fabricated using similar density, but different combinations parame...
cylindrical thin-walled tubes due to construction and easy installation, high energy absorption capacity are used in the automotive industry as an impact energy absorber. however, the main weakness of cylindrical tubes is in the high initial peak load. therefore, in this paper, to overcome this weakness, a buckling initiator is used at the top of the tube. this buckling initiator is a steel rod...
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