11 research outputs found

    Charged-particle nuclear modification factors in PbPb and pPb collisions at √=sNN=5.02 TeV

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    The spectra of charged particles produced within the pseudorapidity window |η| < 1 at √ sNN = 5.02 TeV are measured using 404 µb −1 of PbPb and 27.4 pb−1 of pp data collected by the CMS detector at the LHC in 2015. The spectra are presented over the transverse momentum ranges spanning 0.5 < pT < 400 GeV in pp and 0.7 < pT < 400 GeV in PbPb collisions. The corresponding nuclear modification factor, RAA, is measured in bins of collision centrality. The RAA in the 5% most central collisions shows a maximal suppression by a factor of 7–8 in the pT region of 6–9 GeV. This dip is followed by an increase, which continues up to the highest pT measured, and approaches unity in the vicinity of pT = 200 GeV. The RAA is compared to theoretical predictions and earlier experimental results at lower collision energies. The newly measured pp spectrum is combined with the pPb spectrum previously published by the CMS collaboration to construct the pPb nuclear modification factor, RpA, up to 120 GeV. For pT > 20 GeV, RpA exhibits weak momentum dependence and shows a moderate enhancement above unity

    An alternate approach to identify key service sectors' contributors: Experiences from Malaysian economy

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    This study analyzes the direct and indirect rankings and contribution of service sectors in the Malaysian economy from 1987 to 2005. Two different methodologies, that is (1) direct service intensities, and (2) direct plus indirect service intensities have been used to calculate the service intensity of different industries. It is found that the contribution of overall service sectors is mostly positive and steady during the selected time period. However, the empirical findings are quite appealing to identify rankings based on direct and indirect sectoral contributions. The direct sectoral rankings indicate that the contribution of transport and communication is moved from rank 4 to 1; real estate sector moved from rank 15 to 2; and trade moved from rank 2 to 10 from the year 1987 to 2005. However, the direct and indirect intensities and rankings are indicating different directions over the study period. Therefore, the present study aims at studying the evolving nature of service sectors following on the Leontief input-output analysis with means and coefficients of variation. Here, our second method indicates that the manufacturing ranking was 1 in 1987 and also in 2005; the financial related service ranking was 2 in 1987 and 3 in 2005; the trade ranking was 3 in 1987 and 5 in 2005; and the transport and communication ranking was 4 in 1987 and 2 in 2005. We mostly use direct methods to identify key contributors which may direct wrong indications without other supporting justification. This study can be used to identify key contributors especially for policy formulations in Malaysia and elsewhere

    Renewable energy choice: Cost and energy analysis of grid connected photovoltaic system in Malaysia

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    Conventional energy production methods rely upon combustion of hydrocarbon fuels, which exhaust gases that can elevate the temperature of the Earth's atmosphere (greenhouse effect). Alternative methods of power generation are being examined that do not have this negative environmental impact. This study investigates the potential use of a residential grid-connected photovoltaic system in the Klang Valley of Malaysia. A 1-4 kW system would be capable of producing a RM 4,542.00 net profit per year, generating a total cash benefit of RM 95,382.00 in its 21 year project lifespan. Moreover, the system would significantly reduce greenhouse gas emissions (40,604 kg of carbon dioxide, 258 kg of sulfur dioxide, 120 kg of nitrous oxide, and 23 kg of carbon monoxide) throughout its 21 year project lifespan. The results of this study can be used to formulate effective renewable-energy alternatives in Malaysia and elsewhere. (c) 2014 American Institute of Chemical Engineers Environ Prog, 34: 866-880, 201

    What offers solution to the poverty reduction of the Haor people in Bangladesh? seasonal migration or a new inshore economic livelihood policy.

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    Researches from different disciplines are yet to provide a concrete standpoint on causal relationship between poverty and migration. With a market driven attitude, seasonal migration has been increasing dramatically with a hope to reduce the poverty. So far, research has not confirmed if migration helps to reduce poverty or poverty is forced to be migrated. Whatever the fact, it would be realistic that the local community will not migrate if they find better work opportunities with higher productivity for their livings. In this paper, an effort is made to discover the possible ways to make the local community in the Haor area to be productive, ensuring their stay in their homes. A development economic policy guideline is aimed to be provided in order to make the possible ways functional. Along drawing individual and household profile of migrant, a mixed method suggests that some interventions of food stamp, infrastructure facilities and cooperative activities are necessary for in-situ socio-economic development of the Haor people. The outcomes of the study are reliable to apply in underprivileged ecological areas in other developing countries alike

    Search for heavy neutrinos or third-generation leptoquarks in final states with two hadronically decaying tau leptons and two jets in proton-proton collisions at root s=13 TeV

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    Search for dark matter produced in association with heavy-flavor quark pairs in proton-proton collisions at √s=13TeV

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    A search is presented for an excess of events with heavy-flavor quark pairs (tt¯ and bb¯) and a large imbalance in transverse momentum in data from proton–proton collisions at a center-of-mass energy of 13TeV. The data correspond to an integrated luminosity of 2.2fb-1 collected with the CMS detector at the CERN LHC. No deviations are observed with respect to standard model predictions. The results are used in the first interpretation of dark matter production in tt¯ and bb¯ final states in a simplified model. This analysis is also the first to perform a statistical combination of searches for dark matter produced with different heavy-flavor final states. The combination provides exclusions that are stronger than those achieved with individual heavy-flavor final states. © 2017, CERN for the benefit of the CMS collaboration

    Charged-particle nuclear modification factors in PbPb and pPb collisions at root s(NN)=5.02 TeV

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    Made available in DSpace on 2017-08-17T19:11:59Z (GMT). No. of bitstreams: 1 2-s2.0-85017560557.pdf: 833232 bytes, checksum: 52311916e07607baee648fecbe094920 (MD5) Previous issue date: 20172017
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