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RISS 인기검색어
- 검색키워드
- 저자 : S. Grimes (검색결과 5 건)
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S. Taylor,V. Janik,R. Grimes,R. Dashwood 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.9
This study set out to look at the influence of nickel additions on a commercially available AA7020 to understand the impactof the resultant intermetallics on recrystallization, formability and material strength. Elevated temperature tensile testingacross a range of strain rates (5 × 10−4 s−1 × 10−1 s−1) and three temperatures (450− 500 °C) to compare material ductilityfollowed by gas bulge testing at 475 °C and two gas pressures to investigate formability in a test closer to industrial formingconditions. Material strength was established using standard tensile testing, and EBSD used to understand the microstructuralevolution of the materials. It was seen that the nickel additions increased ductility of the material across all test conditions,coupled with increasing the material strength. This was achieved due to the formation of nickel rich intermetallics whichrefine the microstructure during pre-heating through particle stimulated nucleation and subsequently improve strength throughprecipitation hardening in aging treatments.
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Parayil, S.K.,Razzaq, A.,Park, S.M.,Kim, H.R.,Grimes, C.A.,In, S.I. Elsevier 2015 Applied Catalysis A Vol.498 No.-
Carbon and nitrogen co-doped sodium titanate nanotubes (C,N-TNT) active under simulated solar light are synthesized by a simple two-step process comprising an alkaline hydrothermal technique followed by calcination. Different samples of C,N-TNT with varied dopant concentrations are achieved by changing the amount of urea as a nitrogen and carbon dopants. The photocatalysts are characterized using numerous experimental techniques, and under simulated solar light investigated for the photocatalytic conversion of CO<SUB>2</SUB> and water vapor to CH<SUB>4</SUB>. The C,N-TNT sample with an intermediate doping concentration yields the maximum methane yield of 9.75μmol/gh. The key factors contributing in the improvement of photocatalyst performance includes light absorption, surface area and Na<SUP>+</SUP> ions concentration in TNT acting as CO<SUB>2</SUB> adsorption site and photogenerated electrons recombination centers. The higher doping levels results in lower specific surface areas leading to decrease in photocatalyst performance. Our results suggest co-doping of nanostructured photocatalysts is an excellent pathway for improving textural and photocatalytic properties for the respective application domain.
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Razzaq, A.,Grimes, C.A.,In, S.I. Pergamon Press ; Elsevier Science Ltd 2016 Carbon Vol.98 No.-
<P>One-dimensional TiO2 nanotubes arrays (TNT) are the subject of great current interest among the photocatalysis research community, however the relatively large bandgap that provides TiO2 with its excellent corrosion stability severely limits its absorption of solar spectrum energy. To increase the optical absorption of TiO2 while maintaining its otherwise commendable properties a number of approaches have been investigated including doping with non-metal or noble metal co-catalysts such as platinum, coupling with low band gap semiconductors, and the synthesis of carbon-based TiO2 composites. During the past few years graphene-based TiO2 nanostructures have been found to offer improved photoelectrochemical properties, with graphene enhancing light absorption as well as promoting rapid charge transfer. With the aim of replacing expensive noble metal co-catalysts, herein we report a noble metal-free novel nanostructured photocatalytic material fabricated using a facile synthesis approach, comprising a one-dimensional array of TNT covered with a reduced graphene oxide-TiO2 nanoparticles (rGO-TiO2 NP) composite. The novel nanostructure exhibits significantly improved photocurrent density and photochemical activity via conversion of CO2 into methane under simulated solar light irradiation. The improved performance appears due to the combined effect of enhanced light absorption and effective charge separation promoted by the rGO. (C) 2015 Elsevier Ltd. All rights reserved.</P>
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Evaluation of the Experimental np-Angular Distribution at 14.1 MeV Neutron Energy
N. V. Kornilov,T. Massey,S. Grimes 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The total cross section and angular distribution of the (n,p) scattering reaction is an object for detailed experimental and theoretical investigations as a primary standard. In spite of many years efforts these data, in particular the angular distribution are not known with required accuracy. We analyzed available experimental data at ∼14 MeV and concluded that the big data spread is connected mainly with data normalization. We renormalize the original data using the following procedure. All data sets were fit by different polynomial expansions. The data of independent experiments were normalized to reach minimum χ^2. The beginning value was χ^2 = 1.47 and final value χ^2 = 0.41. The data corrections were <5%. The final result is insensitive to the order of polynomial expansion. The final χ^2 of 0.41 indicates that we have reduced systematic errors in the data sets, so we have reduced the error bars by a factor of 1.6. ENDF/B-7 data are in reasonable agreement with evaluated experimental data. But some problem became more visible - it seems that experimental data require stronger angular asymmetry.
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Screening of Indigenous Strains of Lactic Acid Bacteria for Development of a Probiotic for Poultry
Karimi Torshizi, M.A.,Rahimi, Sh.,Mojgani, N.,Esmaeilkhanian, S.,Grimes, J.L. Asian Australasian Association of Animal Productio 2008 Animal Bioscience Vol.21 No.10
In an attempt to develop a probiotic formulation for poultry feed, a number of lactic acid bacteria (LAB) were isolated from chicken intestinal specimens and a series of in vitro experiments were performed to evaluate their efficacy as a potential probiotic candidate. A total of 650 LAB strains were isolated and screened for their antagonistic potential against each other. Among all the isolates only three isolates (TMU121, 094 and 457) demonstrated a wide spectrum of inhibition and were thus selected for detailed investigations. All three selected isolates were able to inhibit the growth of E. coli and Salmonella species, although to variable extent. The nature of the inhibitory substance produced by the isolates TMU121 and 094 appeared to be associated with bacteriocin, as their activity was completely lost after treatment with proteolytic enzymes, while pH neutralization and catalase enzyme had no effect on the residual activity. In contrast, isolate TMU457 was able to resist the effect of proteolytic enzymes while pH neutralization completely destroyed its activity. Attempts were made to study the acid, bile tolerance and cell surface hydrophobicity of these isolates. TMU121 showed high bile salt tolerance (0.3%) and high cell surface hydrophobicity compared to the other two strains studied, while TMU094 appeared the most pH resistant strain. Based on these results, the three selected LAB isolates were considered as potential ingredients for a chicken probiotic feed formulation and were identified to species level based on their carbohydrate fermentation pattern by using API 50CH test kits. The three strains were identified as Lactobacillus fermentum TMU121, Lactobacillus rhamnosus TMU094, and Pediococcus pentosaceous TMU457.
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