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Measurement of jet radial profiles in Pb–Pb collisions at <sub> s NN </sub> = 2.76 TeV
Acharya, S.,Adamová,, D.,Adhya, S.P.,Adler, A.,Adolfsson, J.,Aggarwal, M.M.,Aglieri Rinella, G.,Agnello, M.,Agrawal, N.,Ahammed, Z.,Ahmad, S.,Ahn, S.U.,Aiola, S.,Akindinov, A.,Al-Turany, M.,Alam North-Holland Pub. Co 2019 Physics letters. Section B Vol.796 No.-
<P><B>Abstract</B></P> <P>The jet radial structure and particle transverse momentum ( <SUB> p T </SUB> ) composition within jets are presented in centrality-selected Pb–Pb collisions at <SUB> s NN </SUB> = 2.76 TeV. Track-based jets, which are also called charged jets, were reconstructed with a resolution parameter of R = 0.3 at midrapidity | <SUB> η ch jet </SUB> | < 0.6 for transverse momenta <SUB> p T , ch jet </SUB> = 30 –120 GeV/<I>c</I>. Jet–hadron correlations in relative azimuth and pseudorapidity space ( Δ φ , Δ η ) are measured to study the distribution of the associated particles around the jet axis for different <SUB> p T , assoc </SUB> -ranges between 1 and 20 GeV/<I>c</I>. The data in Pb–Pb collisions are compared to reference distributions for pp collisions, obtained using embedded PYTHIA simulations. The number of high- <SUB> p T </SUB> associate particles ( 4 < <SUB> p T , assoc </SUB> < 20 GeV/<I>c</I>) in Pb–Pb collisions is found to be suppressed compared to the reference by 30 to 10%, depending on centrality. The radial particle distribution relative to the jet axis shows a moderate modification in Pb–Pb collisions with respect to PYTHIA. High- <SUB> p T </SUB> associate particles are slightly more collimated in Pb–Pb collisions compared to the reference, while low- <SUB> p T </SUB> associate particles tend to be broadened. The results, which are presented for the first time down to <SUB> p T , ch jet </SUB> = 30 GeV/<I>c</I> in Pb–Pb collisions, are compatible with both previous jet–hadron-related measurements from the CMS Collaboration and jet shape measurements from the ALICE Collaboration at higher <SUB> p T </SUB> , and add further support for the established picture of in-medium parton energy loss.</P>
Study of the Λ–Λ interaction with femtoscopy correlations in p p and p–Pb collisions at the LHC
Acharya, S.,Adamová,, D.,Adhya, S.P.,Adler, A.,Adolfsson, J.,Aggarwal, M.M.,Aglieri Rinella, G.,Agnello, M.,Agrawal, N.,Ahammed, Z.,Ahmad, S.,Ahn, S.U.,Aiola, S.,Akindinov, A.,Al-Turany, M.,Alam North-Holland Pub. Co 2019 Physics letters. Section B Vol.797 No.-
<P><B>Abstract</B></P> <P>This work presents new constraints on the existence and the binding energy of a possible Λ–Λ bound state, the H-dibaryon, derived from Λ–Λ femtoscopic measurements by the ALICE collaboration. The results are obtained from a new measurement using the femtoscopy technique in ▪ collisions at s = 13 TeV and p – Pb collisions at <SUB> s NN </SUB> = 5.02 TeV, combined with previously published results from ▪ collisions at s = 7 TeV. The Λ–Λ scattering parameter space, spanned by the inverse scattering length f 0 − 1 and the effective range <SUB> d 0 </SUB> , is constrained by comparing the measured Λ–Λ correlation function with calculations obtained within the Lednický model. The data are compatible with hypernuclei results and lattice computations, both predicting a shallow attractive interaction, and permit to test different theoretical approaches describing the Λ–Λ interaction. The region in the ( f 0 − 1 , <SUB> d 0 </SUB> ) plane which would accommodate a Λ–Λ bound state is substantially restricted compared to previous studies. The binding energy of the possible Λ–Λ bound state is estimated within an effective-range expansion approach and is found to be <SUB> B Λ Λ </SUB> = 3.2 − 2.4 + 1.6 (stat) − 1.0 + 1.8 (syst) MeV.</P>
Conflict Avoidance in Construction Projects: Six 'C' Rescue Factors
Acharya Nirmal Kumar,Lee Young-Dai,Kim Sa-Myeong Korea Institute of Construction Engineering and Ma 2005 한국건설관리학회 논문집 Vol.6 No.6
Conflict is aroused when different people having different interest work together for fulfilling same the objectives. As the construction field is large, complex, volatile and requires tremendous capital, there are always greater challenges and possibility of risks of conflicts. Poor management practices in construction site and trying to protect risks and threats by contracting parties are the cited sources of the construction conflicts. The best management practice is to resolve the problems before these cultivate as conflicts. This paper has identified six dispute avoidance factors-Convince, Coordination, Consideration, Compromise, Consolation and Coercion. Six 'C' factors described in this paper are the mantra (formula) to execute a conflict free construction project. The conflict avoidance factors have been verified through a successfully executed project called TEVT development project (Technical Education and Vocational Training) during 1993-1998 in Nepal. The results show that the six 'C' factors 'C' considered during the implementation of the project, construction conflicts would be controlled or minimized effectively.
D -Meson Azimuthal Anisotropy in Midcentral Pb-Pb Collisions at sNN=5.02 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 American Physical Society 2018 Physical Review Letters Vol.120 No.10
<P>The azimuthal anisotropy coefficient v(2) of prompt D-0, D+, D*+, and D-s(+) mesons was measured in midcentral (30%-50% centrality class) Pb-Pb collisions at a center-of-mass energy per nucleon pair root s(NN)=5.02 TeV, with the ALICE detector at the LHC. The D mesons were reconstructed via their hadronic decays at midrapidity, |y| < 0.8, in the transverse momentum interval 1 < p(T) < 24 GeV/c. The measured D-meson v(2) has similar values as that of charged pions. The D-s(+) v(2), measured for the first time, is found to be compatible with that of nonstrange D mesons. The measurements are compared with theoretical calculations of charm-quark transport in a hydrodynamically expanding medium and have the potential to constrain medium parameters.</P>
Acharya, S.,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.,Albuquerque, D.S.D.,Aleks North-Holland Pub. Co 2018 Physics letters. Section B Vol.780 No.-
<P><B>Abstract</B></P> <P>The production of <SUP> Z 0 </SUP> bosons at large rapidities in Pb–Pb collisions at <SUB> s NN </SUB> = 5.02 TeV is reported. <SUP> Z 0 </SUP> candidates are reconstructed in the dimuon decay channel ( <SUP> Z 0 </SUP> → <SUP> μ + </SUP> <SUP> μ − </SUP> ), based on muons selected with pseudo-rapidity − 4.0 < η < − 2.5 and <SUB> p T </SUB> > 20 GeV/ c . The invariant yield and the nuclear modification factor, <SUB> R AA </SUB> , are presented as a function of rapidity and collision centrality. The value of <SUB> R AA </SUB> for the 0–20% central Pb–Pb collisions is 0.67 ± 0.11 (stat.) ± 0.03 (syst.) ± 0.06 (corr. syst.) , exhibiting a deviation of 2.6<I>σ</I> from unity. The results are well-described by calculations that include nuclear modifications of the parton distribution functions, while the predictions using vacuum PDFs deviate from data by 2.3<I>σ</I> in the 0–90% centrality class and by 3<I>σ</I> in the 0–20% central collisions.</P>
Inclusive J/<i>ψ</i> production in Xe–Xe collisions at <sub> s NN </sub> = 5.44 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.,Albuquerqu North-Holland Pub. Co 2018 Physics letters. Section B Vol.785 No.-
<P><B>Abstract</B></P> <P>Inclusive J/<I>ψ</I> production is studied in Xe–Xe interactions at a centre-of-mass energy per nucleon pair of <SUB> s NN </SUB> = 5.44 TeV, using the ALICE detector at the CERN LHC. The J/<I>ψ</I> meson is reconstructed via its decay into a muon pair, in the centre-of-mass rapidity interval 2.5 < y < 4 and down to zero transverse momentum. In this Letter, the nuclear modification factors <SUB> R AA </SUB> for inclusive J/<I>ψ</I>, measured in the centrality range 0–90% as well as in the centrality intervals 0–20% and 20–90% are presented. The <SUB> R AA </SUB> values are compared to previously published results for Pb–Pb collisions at <SUB> s NN </SUB> = 5.02 TeV and to the calculation of a transport model. A good agreement is found between Xe–Xe and Pb–Pb results as well as between data and the model.</P>
Acharya, Tri Dev,Yang, In Tae,Lee, Dong Ha MYU K.K. 2018 Sensors and materials Vol.30 No.8
<P>With over four decades spent collecting spaceborne moderate-resolution imagery, Landsat represents the longest remote sensing mission in the world, and has had various applications. Land cover mapping is its heritage for research around the world. Landsat 8 continues the legacy of previous Landsat systems, with a new Operational Land Imager (OLI) sensor that has high spectral resolution and improved signal-to-noise ratio for better characterization of land cover. With improved quality, data size also increases. Hence, with limited research in adjusting data size, it is necessary to explore robust land cover classification techniques that produce accurate maps with more or fewer inputs. The Optimum Index Factor (OIF) is a statistic value that can be used to select the optimum combination of three bands in a satellite image that has the highest amount of information. In this study, we explore the land cover classification of OLI imagery based on OIF. Two test sites were selected around the hilly regions of Korea for OLI original composite, first-rank OIF composite, and OLI original with sum derivative of top-three OIF ranked composites. These three composites were classified with the well-known Spectral Angle Mapper (SAM) and Support Vector Machine (SVM) classifiers. The results were then analyzed and compared on the basis of producer accuracy, user accuracy, overall accuracy, and kappa coefficient. The result shows that the first-ranked OIF with a three-band composite shows a similar classification accuracy in SVM and slightly less in SAM, while the ten-band composite with OLI original bands and the sum derivative of the top-three OIF rank shows the same result or a small improvement in SVM classification. OIF-derivative composites can be useful in classification problems depending on whether the minimum amount of data for a similar result or more data to achieve higher accuracy is preferred.</P>
ACHARYA TRI DEV,양인태,이동하 한국측량학회 2018 한국측량학회지 Vol.36 No.1
DEM (Digital Elevation Model) is a useful dataset which represents the earth surface. Beside many applications, production and frequent update of DEM is a costly task. Recently global satellite based DEMs are available which has huge potential for application. To check the accuracy, this study compares two global DEMs: AW3D30 (Advanced Land Observing Satellite World 3D 30m) and SRTM30 (Shuttle Radar Topography Mission Global 30m) with reference resampled LiDAR DEM 30m in a test area around Chuncheon, Korea. The comparison analysis was based on statistics of each DEM, their difference, profiles, slope, basin and stream orders. As a result, it is found that SRTM30 and AW3D30 were much similar but inconsistent in the test area compared to the LiDAR30 DEM. In addition, SRTM30 shows less difference with LiDAR30 compared to the AW3D30 DEM. But, DEMs should be very carefully examined for area which has temporal or season changes. For basin and stream analysis, global DEMs can be used only for regional scale analysis not local large scales.