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Dual-phase steel is characterized by an interesting combination of high strength, good ductility, continuous yielding, high initial work hardening rates, and a low yield stress to tensile strength ratio. The changes in the yield stress and appearance of prolonged lüder's strain in the stress strain curves of static strain aged dual phase steel motivate studying the parameters affecting the formation...
In order to study the diversity mechanism with different decaying type in bamboo, the components and morphology of Phyllostachys edulis, which was decayed by P.c (White-rot) and G.t (Brown-rot) for 12 weeks, respectively, were investigated by XPS method. XPS results showed that the content of C1 decreased and C2, C3 increased decayed by P.c, the disintegration rate of lignin was higher than cellulose...
Polymeric insulation materials have not been used in HVDC cable systems until recently because of the tendency of polymers to deplete accumulated charges very slowly. Research on space charge injection, conduction and trapping mechanisms can reveal information about which new materials are the best candidates for HVDC cable insulation. In this paper, the space charge accumulation processes are evaluated...
This paper describes the electric properties of new carbon materials derived from the chemical synthesis mixed with insulation oil or lubricating oil and sulfuric acid. New carbon material as an activated carbon has higher capacitance expecting for large electric energy storage system. The capacitance and internal resistance were measured as a function of mixture ratio of the materials using the capacitor...
Five different cellular glasslike carbons prepared from tannin-based foam pyrolysed at 900°C and presenting variable electric conductivities have been evaluated for electromagnetic (EM) interference shielding effectiveness (SE) in Ka-band. Sufficiently large dielectric loss tangent was also observed in radio frequency range from 1MHz to 2GHz. The effect of density on the EM response properties in...
In the work we develop programs for computation of the system of atoms at every step and visualization of that data, also we research of thermodynamic properties and conditions of formation of different carbon nanostructures, try to predict existence of new materials. Nowadays we have two separate programs: one for computation and one for visualization. We continue to collect statistical data, investigate...
The possibility is shown to synthesize a nanodispersed powder in the system “carbon-nitrogen” in a hypervelocity electrical discharge plasma jet generated by a coaxial magnetoplasma accelerator (CMPA). The plasma shot is provided in the pressurized chamber filled with the gaseous nitrogen. Up to 1 gram of black powdered product is synthesized for one working cycle having a duration about 100 ms. According...
The effect of nickel coating upon the torsional behaviors of single-walled carbon nanotube (SWCNT) was defined, and torsion behaviors were investigated using the molecular dynamics (MD) simulation method. In this work, an armchair (6,6) carbon nanotube was considered. Both SWCNT and SCNT coating Ni (SWCNT-Ni) were analyzed at 0K and 300K. By simulating torsion process of SWCNT-Ni, mechanical behaviors...
The conductivity of carbon nanotube (CNT) networks is investigated in this work. A mathematical model based on the percolation theory is developed to be implemented in simulation software to design CNT-based high-frequency components. For this purpose, two independent measurement setups are used to extract the conductivity of carbon nanotubes in its dry powder form as furnished by the manufacturer...
This paper deals with the smoke spreading in the road tunnel issue. At the first part we deal with the genesis of the smoke during a fire in the tunnel and its characteristics. We have focused on the characteristics which influence its speed and direction of the smoke spreading in the tunnel as well as its structure that influence the people who are present inside the tunnel. The paper is also dealing...
In this paper we evaluate the energy saving strategies for the materials sector with a focus on the aluminum industry. An interconnected dynamic model is constructed to evaluate the strategies independently as well as in combination, such that the intertemporal effects and different interrelations within the material-energy space are accounted for. Both technical and social levers are considered....
In this study, effects of ionic radius, charge, and mass on the electro sorption desalination performance of activated carbon electrodes were investigated. The sorption capacity of carbon electrodes was approximately 0.08-0.18 mmol/g carbon. The electro sorption capacity of monovalent ions was higher than multivalent ions. Covering area of cation on electrode is smaller than anion, when considering...
A material of nitrogen, carbon-codoped TiO2 (HITNC-1) with an unusual optical property in the near-infrared region is prepared at 800 °C in NH3 and CO2 atmosphere. TEM results show semiconductor nanocrystals with grain size approximately in the range of 2~8 nm. HITNC-1 exhibits two strong absorption bands in near-infrared region, which is relative with the F-type color centers produced by the behaviors...
The paper analyses the electromagnetic shielding measurements of carbon fiber composite structure. In particular the shielding effectiveness is measured applying the nested reverberation chamber method in the frequency range of 3.5 GHz–8.5 GHz. This method ensure a realistic electromagnetic excitation of the sample under test characterized by a random polarization and incoming direction. The paper...
Life Cycle Assessment (LCA) is considered as the most advanced tool for improving the environmental performance of products. There are however barriers that reduce its implementation, especially in small and mediumsized enterprises (SMEs), such as data intensity, costs, and expertise required to run the LCA studies. The European project “LCA to go” develops sectoral methods and tools for bio-based...
This paper presents results of a study on multi-layer binomial radar absorbers constructed from rubber latex using coconut shells as fillers. The microwave properties of the absorbers were measured using a microwave non-destructive testing (MNDT) technique. The performance of single layer, two-layer and three-layer absorbers were simulated using a commercial 3D electromagnetic simulator. Single layer...
This paper presents experimental results of our study on multi-layer microwave absorbers synthesized using coconut shells as the source of activated carbon. In this investigation, activated carbon with content variation of 0, 10, 15, 20, 25 and 30 wt% were mixed with Flaxane-80 to study the microwave properties of the absorbers. Three- and four-layer microwave absorbers with various carbon contents...
The paper focuses on the role of simulation within the RSB GHG Tool, which is a web-based decision support tool that assesses greenhouse gas emissions of biofuels according to the principles of the Roundtable on Sustainable Biofuels. Using a questionnaire, each operator can specify his individual data and calculate the GHG emission for his production step. To derive the environmental flows required...
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