Metasurfaces offer the potential to control light propagation at the nanoscale for applications in both free-space and surface-confined geometries1-3. Existing metasurfaces frequently utilize metallic polaritonic4 ele...
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We present measurements of the low temperature thermal conductivity for materials useful in the construction of cryogenic supports for scientific instrumentation and in the fabrication of flat flexible cryogenic cabli...
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Chemical looping combustion (CLC) is a promising candidate for cost effective means of CO 2 capture and higher energy production from power plants. The CLC process uses an oxygen carrier (usually a metal) for the sepa...
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Chemical looping combustion (CLC) is a promising candidate for cost effective means of CO 2 capture and higher energy production from power plants. The CLC process uses an oxygen carrier (usually a metal) for the separation of oxygen from air and the oxygen is then used for fuel combustion. The two processes occur in two inter-connected reactors which are generally termed air and fuel reactors. The fuel combustion process results in a rich stream of CO 2 and water. The CO 2 stream is captured with negligible energy consumption by condensation of the exhaust gases. In this paper, the technical and economic performance of a power plant using CLC with two methods of waste heat utilization from the plant exhaust gas streams is studied. The plant studied is a natural gas powered plant of 50MWth gross input energy. The waste heat is utilized either for additional output energy generation using a steam turbine or for cooling using absorption chilling. The economic analysis shows a higher economic value of the waste utilization for cooling purpose compared to additional power generation. For the absorption chilling system, the cost of electricity (COE) is about 5.5 cents/kWh and has a payback period of about 6.4 years using the method employed in the study while the payback period is 3.3 years using a generic methodology employed in other studies.
We propose a theory based on non-equilibrium thermodynamics to describe the mechanical behavior of an active polymer gel created by the inclusion of molecular motors in its solvent. When activated, these motors attach...
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According to increasingly stringent regulations on particulate emission from automotive vehicles, diesel engine must be equipped with Diesel Particulate Filter (DPF) to trap the Particulate Matter (PM) which are very ...
According to increasingly stringent regulations on particulate emission from automotive vehicles, diesel engine must be equipped with Diesel Particulate Filter (DPF) to trap the Particulate Matter (PM) which are very harmful to human health. Diesel particulate matters are composed primarily of unburned hydrocarbon (soot) and metal oxide ashes as solid fraction. DPF can trap PM with higher filtration efficiency and the process which can burn the soot into carbon dioxide is called regeneration process. Although regeneration process can burn the soot effectively, incombustible ashes will be remained inside the DPF channel causing engine back pressure. These metal oxide ashes are mainly derived from lubricant additives, engine wear and trace metals from diesel fuel. In this article, different nanostructures of diesel soot and metal oxide ash derived by diesel blending lube oil condition were briefly compared using Transmission Electron Microscopy (TEM) image analysis. Electron Dispersive X-ray Spectroscopy (EDS) analysis was introduced to investigate the chemical composition of particulate matters. Thermogravimetric Analysis (TGA) was also conducted to compare the oxidation kinetics of pure diesel soot and the influence of metal oxide ash on soot oxidation kinetics. Contamination of metal oxide ashes promoted soot oxidation rate due to the presence of metallic additives from lube oil acting as a catalyst on soot oxidation kinetics.
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