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Acharya, Raju,Han, Jie,Parsons, Robert L.,Brennan, James J. Techno-Press 2016 Geomechanics & engineering Vol.11 No.5
This paper presents field study and numerical modeling results for a single-cell low-fill concrete box culvert under a flexible pavement subjected to traffic loading. The culvert in the field test was instrumented with displacement transducers to capture the deformations resulting from different combinations of static and traffic loads. A low-boy truck with a known axle configuration and loads was used to apply seven static load combinations and traffic loads at different speeds. Deflections under the culvert roof were measured during loading. Soil and pavement samples were obtained by drilling operation on the test site. The properties of the soil and pavement layers were determined in the laboratory. A 3-D numerical model of the culvert was developed using a finite difference program FLAC3D. Linear elastic models were used for the pavement layers and soil. The numerical results with the material properties determined in the laboratory were compared with the field test results. The observed deflections in the field test were generally smaller under moving loads than static loads. The maximum deflections measured during the static and traffic loads were 0.6 mm and 0.41 mm respectively. The deflections computed by the numerical method were in good agreement with those observed in the field test. The deflection profiles obtained from the field test and the numerical simulation suggest that the traffic load acted more like a concentrated load distributed over a limited area on the culvert. Elastic models for culverts, pavement layers, and surrounding soil are appropriate for numerical modeling of box culverts under loading for load rating purposes.
Acharya, Suresh,Stark, Timo D.,Oh, Seung Tack,Jeon, Songhee,Pak, Sok Cheon,Kim, Mina,Hur, Jinyoung,Matsutomo, Toshiaki,Hofmann, Thomas,Hill, Rodney A.,Balemba, Onesmo B. American Chemical Society 2017 Journal of agricultural and food chemistry Vol.65 No.18
<P>We investigated the antioxidative properties of (2R,3S,2'R,3'R)-manniflavanone (MF) using in vitro assays and examined its effects on myogenesis and lactate-induced oxidative stress in C2C12 cells. MF was purified from Garcinia buchananii stem bark. H2O2 and oxygen radical absorbance capacity assays demonstrated that MF is a powerful antioxidant. This finding was supported by diphenylpicrylhydrazine radical scavenging activity of MF. MF was less cytotoxic to C2C12 cells compared to ascorbic acid and myricetin. Moreover, MF accelerated myotube formation in the differentiated C2C12 cells by up-regulating myogenic proteins such as MyoG and myosin heavy chain. Furthermore, MF rescued late differentiation of myoblast suppressed by lactate treatment and up -regulated the expression levels of Nrf2 in lactate -induced oxidative stress, indicating that MF stimulates antioxidative activity inside C2C12 cells. Collectively, MF is a potent antioxidant with a higher safety profile than ascorbic acid and myricetin. It reduces oxidative stress -induced delaying of skeletal muscle differentiation by scavenging reactive oxygen species and regulating myogenic proteins factors.</P>
Acharya, S.,Adamová,, D.,Aggarwal, M. M.,Rinella, G. Aglieri,Agnello, M.,Agrawal, N.,Ahammed, Z.,Ahmad, N.,Ahn, S. U.,Aiola, S.,Akindinov, A.,Alam, S. N.,Albuquerque, D. S. D.,Aleksandrov, D.,Al Springer 2017 European Physical Journal C Vol.77 No.5
<P>The invariant differential cross sections for inclusive [FORMULA OMISSION] and [FORMULA OMISSION] mesons at midrapidity were measured in pp collisions at [FORMULA OMISSION] TeV for transverse momenta [FORMULA OMISSION] GeV/<I>c</I> and [FORMULA OMISSION] GeV/<I>c</I>, respectively, using the ALICE detector. This large range in [FORMULA OMISSION] was achieved by combining various analysis techniques and different triggers involving the electromagnetic calorimeter (EMCal). In particular, a new single-cluster, shower-shape based method was developed for the identification of high-[FORMULA OMISSION] neutral pions, which exploits that the showers originating from their decay photons overlap in the EMCal. Above 4 GeV/[FORMULA OMISSION], the measured cross sections are found to exhibit a similar power-law behavior with an exponent of about 6.3. Next-to-leading-order perturbative QCD calculations differ from the measured cross sections by about 30% for the [FORMULA OMISSION], and between 30–50% for the [FORMULA OMISSION] meson, while generator-level simulations with PYTHIA 8.2 describe the data to better than 10–30%, except at [FORMULA OMISSION] GeV/[FORMULA OMISSION]. The new data can therefore be used to further improve the theoretical description of [FORMULA OMISSION] and [FORMULA OMISSION] meson production.</P>
Acharya, S.,Adamová,, D.,Aggarwal, M. M.,Aglieri Rinella, G.,Agnello, M.,Agrawal, N.,Ahammed, Z.,Ahmad, N.,Ahn, S. U.,Aiola, S.,Akindinov, A.,Alam, S. N.,Albuquerque, D. S. D.,Aleksandrov, D.,Al Springer 2017 European Physical Journal C Vol.77 No.6
<P>We present results on transverse momentum ([FORMULA OMISSION]) and rapidity ([FORMULA OMISSION]) differential production cross sections, mean transverse momentum and mean transverse momentum square of inclusive [FORMULA OMISSION] and [FORMULA OMISSION] at forward rapidity ([FORMULA OMISSION]) as well as [FORMULA OMISSION]-to-[FORMULA OMISSION] cross section ratios. These quantities are measured in pp collisions at center of mass energies [FORMULA OMISSION] and 13 TeV with the ALICE detector. Both charmonium states are reconstructed in the dimuon decay channel, using the muon spectrometer. A comprehensive comparison to inclusive charmonium cross sections measured at [FORMULA OMISSION], 7 and 8 TeV is performed. A comparison to non-relativistic quantum chromodynamics and fixed-order next-to-leading logarithm calculations, which describe prompt and non-prompt charmonium production respectively, is also presented. A good description of the data is obtained over the full [FORMULA OMISSION] range, provided that both contributions are summed. In particular, it is found that for [FORMULA OMISSION] GeV/<I>c</I> the non-prompt contribution reaches up to 50% of the total charmonium yield.</P>
Neutral pion and η meson production at midrapidity in Pb-Pb collisions at sNN=2.76 TeV
Acharya, S.,Acosta, F. T.-.,Adamová,, D.,Adolfsson, J.,Aggarwal, M. M.,Aglieri Rinella, G.,Agnello, M.,Agrawal, N.,Ahammed, Z.,Ahn, S. U.,Aiola, S.,Akindinov, A.,Al-Turany, M.,Alam, S. N.,Albuqu American Physical Society 2018 Physical review. C Vol.98 No.4
<P>Neutral pion and eta meson production in the transverse momentum range 1 < p(T) < 20 GeV/c have been measured at midrapidity by the ALICE experiment at the Large Hadron Collider (LHC) in central and semicentral Pb-Pb collisions at root S-NN = 2.76 TeV. These results were obtained using the photon conversion method as well as the Photon Spectrometer (PHOS) and Electromagnetic Calorimeter detectors. The results extend the upper p(T) reach of the previous ALICE pi(0) measurements from 12 to 20 GeV/c and present the first measurement of eta meson production in heavy-ion collisions at the LHC. The eta/pi(0) ratio is similar for the two centralities and reaches at high p(T) a plateau value of 0.457 +/- 0.013(stat) +/- 0.018(syst) A suppression of similar magnitude for pi(0) and eta meson production is observed in Pb-Pb collisions with respect to their production in pp collisions scaled by the number of binary nucleon-nucleon collisions. We discuss the results in terms of Next to Leading Order (NLO) pQCD predictions and hydrodynamic models. The measurements show a stronger suppression than observed at lower center-of-mass energies in the p T range 6 < p(T) < 10 GeV/c. For p(T) < 3 GeV/c, hadronization models describe the pi(0) results while for the eta some tension is observed.</P>
Linear and non-linear flow mode in Pb–Pb collisions at <sub> s NN </sub> = 2.76 TeV
Acharya, S.,Adamová,, D.,Adolfsson, J.,Aggarwal, M.M.,Aglieri Rinella, G.,Agnello, M.,Agrawal, N.,Ahammed, Z.,Ahmad, N.,Ahn, S.U.,Aiola, S.,Akindinov, A.,Alam, S.N.,Alba, J.L.B.,Albuquerque, D.S North-Holland Pub. Co 2017 Physics letters. Section B Vol.773 No.-
<P><B>Abstract</B></P> <P>The second and the third order anisotropic flow, <SUB> V 2 </SUB> and <SUB> V 3 </SUB> , are mostly determined by the corresponding initial spatial anisotropy coefficients, <SUB> ε 2 </SUB> and <SUB> ε 3 </SUB> , in the initial density distribution. In addition to their dependence on the same order initial anisotropy coefficient, higher order anisotropic flow, <SUB> V n </SUB> ( n > 3 ), can also have a significant contribution from lower order initial anisotropy coefficients, which leads to mode-coupling effects. In this Letter we investigate the linear and non-linear modes in higher order anisotropic flow <SUB> V n </SUB> for n = 4 , 5, 6 with the ALICE detector at the Large Hadron Collider. The measurements are done for particles in the pseudorapidity range | η | < 0.8 and the transverse momentum range 0.2 < <SUB> p T </SUB> < 5.0 GeV / c as a function of collision centrality. The results are compared with theoretical calculations and provide important constraints on the initial conditions, including initial spatial geometry and its fluctuations, as well as the ratio of the shear viscosity to entropy density of the produced system.</P>
Genetic diversity and geographic distribution of Bemisia tabaci species complex in Nepal
Acharya Rajendra,Kumar Shrestha Yam,Raj Sharma Sushant,이경열 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.2
Bemisia tabaci species complex comprises at least 44 cryptic species worldwide. Here, we analyze the nucleotide sequences of mitochondrial cytochrome oxidase subunit 1 (COI) gene obtained from 76 samples of B. tabaci collected from 23 districts in Nepal. This is the first genetic and geographic study of B. tabaci species complex in Nepal. Our phylogenetic study identified the presence of three cryptic species—Asia I, Asia II 1, and Asia II 5—with high interspecific but low intraspecific variations. Among the three cryptic species, Asia II 5 was the most prevalent in Nepal, constituting 64.47% of all the sequenced samples. Based on haplotype network analysis of COI sequences, Asia II 1 was more genetically diversified than the other two cryptic species. Our results provided useful information on the genetic diversity and geographic distribution of B. tabaci in Nepal, which help monitor population changes of B. tabaci at cryptic species level and develop sustainable management strategies for its control.