Surfactant flooding is a well-known chemical approach for enhancing oil *** flooding has the disadvantage that it cannot withstand the harsh reservoir *** in oil recovery and release are made possible by the use of na...
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Surfactant flooding is a well-known chemical approach for enhancing oil *** flooding has the disadvantage that it cannot withstand the harsh reservoir *** in oil recovery and release are made possible by the use of nanoparticles and surfactants and CO_(2)co-injection because they generate stable foam,reduce the interfacial tension(IFT)between water and oil,cause emulsions to spontaneously form,change the wettability of porous media,and change the characteristics of *** the current work,the simultaneous injection of SiO_(2),Al2O3 nanoparticles,anionic surfactant SDS,and CO_(2)in various scenarios were evaluated to determine the microscopic and macroscopic efficacy of heavy oil ***(interfacial tension)was reduced by 44%when the nanoparticles and SDS(2000 ppm)were added,compared to a reduction of roughly 57%with SDS ***-stabilized CO_(2)foam flooding,however,is unstable due to the adsorption of SDS in the rock surfaces as well as in heavy *** assess foam's potential to shift CO_(2)from the high permeability zone(the thief zone)into the low permeability zone,directly visualizing micromodel flooding was successfully executed(upswept oil-rich zone).Based on typical reservoir permeability fluctuations,the permeability contrast(defined as the ratio of high permeability to low permeability)for the micromodel flooding was ***,the results of the experiment demonstrated that by utilizing SDS and nanoparticles,minimal IFT was *** addition of nanoparticles to surfactant solutions,however,greatly boosted oil recovery,according to the findings of flooding *** ultimate oil recovery was generally improved more by the anionic surfactant(SDS)solution including nanoparticles than by the anionic surfactant(SDS)alone.
Optical holography is a promising technique to achieve a naked-eye 3D ***,the narrow viewing angle and chromatic aberration are the two key issues that usually limit the holographic display performance.A recent work p...
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Optical holography is a promising technique to achieve a naked-eye 3D ***,the narrow viewing angle and chromatic aberration are the two key issues that usually limit the holographic display performance.A recent work proposes a novel way to circumvent these constraints by introducing a color liquid crystal grating into a timesequenced holography system.
The polarization of the received signals can be effectively matched regardless of the orientation of the receiving antenna using circularly polarized antennas. A compact printed monopole antenna with a circular ring p...
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Polymer carbon nitride(PCN)is widely used in ***,pristine PCN has disadvantages such as insufficient visible light absorption and low photogenerated carrier separation efficiency that greatly limited the photocatalyti...
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Polymer carbon nitride(PCN)is widely used in ***,pristine PCN has disadvantages such as insufficient visible light absorption and low photogenerated carrier separation efficiency that greatly limited the photocatalytic *** a non-toxic metal,gallium has the potential to solve the defects of *** ions coordinated with nitrogen in carbon nitride to form Ga-N active sites and improved the photocatalytic *** doped potassium ions form a transmission channel for charge redistribution and transfer between adjacent layers,which is beneficial for better separation of photoexcited *** this study,a series of PCN co-doped with gallium and potassium(Ga-K-PCN)were *** experimental results indicated photocatalytic generation of hydrogen peroxide proceeds through the 2e−oxygen reduction reaction ***,Nyquist plots and photocurrent results further proved that the presence of Ga-N sites and potassium ion doping could significantly improve the separation/transfer of intra-planar and interlayer charge carriers and thus enhance photocatalytic *** Ga10-K3-PCN photocatalysts promoted yield of H_(2)O_(2),with reactivity at 28.2μmol/(g·h)and solar-to-chemical conversion efficiency at 0.64%,surpassed that of a typical photo-catalyst based on PCN(0.18%).
Predicting the performance of a Hybrid EV (Electric Vehicle) is significant to alleviate the complications of insufficient fuel and other battery-related problems that affect the driving capacity. Many energy manageme...
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Porous carbon-encapsulated Ni and Ni-Sn intermetallic compound catalysts were prepared by the one-pot extended Stöber method followed by carbonization and tested for in-situ hydrothermal deoxygenation of methyl p...
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Porous carbon-encapsulated Ni and Ni-Sn intermetallic compound catalysts were prepared by the one-pot extended Stöber method followed by carbonization and tested for in-situ hydrothermal deoxygenation of methyl palmitate with methanol as the hydrogen *** the catalyst preparation,Sn doping reduces the size of carbon spheres,and the formation of Ni-Sn intermetallic compounds restrain the graphitization,contributing to larger pore volume and pore ***,a more facile mass transfer occurs in carbon-encapsulated Ni-Sn intermetallic compound catalysts than in carbonencapsulated Ni *** the in-situ hydrothermal deoxygenation,the synergism between Ni and Sn favors palmitic acid hydrogenation to a highly reactive hexadecanal that easily either decarbonylate to n-pentadecane or is hydrogenated to *** high reaction temperature,hexadecanol undergoes dehydrogenation-decarbonylation,generating ***,the C-C bond hydrolysis and methanation are suppressed on Ni-Sn intermetallic compounds,favorable for increasing the carbon yield and reducing the H_(2) *** npentadecane and n-hexadecane yields reached 88.1%and 92.8%on carbon-encapsulated Ni_(3) Sn_(2) intermetallic compound at 330℃.After washing and H_(2) reduction,the carbon-encapsulated Ni_(3) Sn_(2) intermetallic compound remains stable during three recycling *** is ascribed to the carbon confinement that effectively suppresses the sintering and loss of metal particles under harsh hydrothermal conditions.
The aim of the present work is to predict the performance of single cylinder direct injection diesel engine fuelled with lemon peel oil biodiesel (B25) loaded by ceria nanoparticle additives and coated with yttria-cer...
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In this study,the potential of a low-cost bio-adsorbent,taken directly from Date Palm Trunk Fibers(DPTF)agricultural wastes,for cadmium ions removal from wastewaters is *** performances of this adsorbent are evaluated...
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In this study,the potential of a low-cost bio-adsorbent,taken directly from Date Palm Trunk Fibers(DPTF)agricultural wastes,for cadmium ions removal from wastewaters is *** performances of this adsorbent are evaluated by building breakthrough curves at different bed heights and flow rates while keeping other parameters,such as the initial feed concentration,pH,and particle size,*** results indicate that the maximum cadmium adsorption capacity of DTPF can be obtained from the Thomas model as 51.5 mg/g with the most extended mass transfer zone of 83 min at the lowest flow rate at 5 ml/*** saturation concentrations(NO)and the rate constant(kab)obtained from the BDST(bed depth service time)model are 7022.16 mg/l and 0.0536 l/***,*** the Yon-Nelsen Model,it is found that operating at a lower flow rate leads to a larger value of the elapsed needed time to reach a 50%*** Wolborska model indicates that the bed capacity increases with decreasing the flow rate,and the adsorbent can achieve a greater external mass transfer kinetic coefficient(2.271/min)at a higher flow rate.
This study is focused on the effect of vibration induced by moving trains in tunnels on the surrounding ground and structures.A three-dimensional finite element model is established for a one-track railway tunnel and ...
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This study is focused on the effect of vibration induced by moving trains in tunnels on the surrounding ground and structures.A three-dimensional finite element model is established for a one-track railway tunnel and an adjacent twelve-storey building frame by using commercial software Midas GTS-NX(2019)and Midas *** study considered the moving load effect of a complete train,which varies with space as well as with *** effect of factors such as train speed,overburden pressure on the tunnel and variation in soil properties are studied in the time *** a result,the variations in horizontal and vertical acceleration for two different sites,i.e.,the free ground surface(without structure)and the area containing the structure,are ***,the displacement pattern of the raft foundation is plotted for different train *** lower speeds,the heaving phenomenon is negligible,but as the speed increases,both the heaving and differential settlement increase in the *** study demonstrates that the effect of moving train vibrations should be considered in the design of new nearby structures and proper ground improvement should be considered for existing structures.
Improving the dehydrogenation behavior of aluminum hydride(AlH3)by introducing additives provides a promising avenue in portable hydrogen source ***,the challenge remains in the development of highly active additives ...
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Improving the dehydrogenation behavior of aluminum hydride(AlH3)by introducing additives provides a promising avenue in portable hydrogen source ***,the challenge remains in the development of highly active additives that facilitate hydrogen storage in composites while maintaining high capacity with a relatively small amount of *** work presents the successful synthesis of TiN nanoparticles by nitriding reaction using TiO_(2) as the *** onset dehydrogenation temperature of AlH_(3) could be remarkably reduced to 52.9℃ on account of the catalytic effect of TiN ***,the composite exhibits a close approximation to the realistic capacity of pure aluminum hydride,with a maximum capacity of 9.9 wt.%.The notable decrease in the apparent dehydrogenation activation energy of AlH_(3) from 130.86 to 86.69 kJ·mol^(-1) after the incorporation of TiN substantiates the pivotal role of multivalent titanium and nitrogen.
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