94 research outputs found

    Experimental Investigations for Start up and Maximum Heat Load of Closed Loop Pulsating Heat Pipe

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    AbstractStartup heat load, maximum heat load and optimum fill ratio of Pulsating Heat Pipe (PHP) of 16 turn, 1mm ID, 2mm OD and 9.6m total length are found out experimentally for water and ethanol as working fluids. PHP is operated in vertical bottom heat mode. Evaporator and condenser temperatures are maintained at 100°C and 28°C respectively. Temperature fluctuations of adiabatic section at startup and maximum heat loads are reported. Experimental results indicate that, startup heat load is independent of fill ratio, but maximum heat load depends on fill ratio. Optimum fill ratio for maximum heat load depends on working fluid for a given PHP and operating temperatures

    Solar aluminium tubular air heater

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    Paper presented to the 3rd Southern African Solar Energy Conference, South Africa, 11-13 May, 2015.Efficient, cost effective and light weight solar collectors to meet the low temperature needs, at or below 100oC will be the better option for utilisation of solar energy in developing countries like India. Test results of a patented low cost light weight modular solar collector developed and tested at Heat Pump Laboratory at IIT Bombay, HPL_IITB, (1907 N 7251 E) are presented. A 5 m2 aperture collector was installed on HPL_IITB terrace with an optimum tilt of 47o for the month of December. Heat delivered by the collector in terms of ambient air heated to 70.3oC, at average mass flow rate of 53.9 g/s, over 9 h test period was 21.5 kWh with an efficiency of 70.2%. Power consumed by air circulating fan was less than 1% of the heat delivered by the collector. Weight of this novel collector is only 7.6 kg/m2. Collector costs approximately INR 5,000/m2 (USD 82/m2) which works out to be about INR 1,200/kWh.d-1 (USD 20/kWh.d-1). Payback calculated, without any subsidy, when used for industrial heating applications is approximately 252 days.dc201

    Measurements of differential production cross sections for a Z boson in association with jets in pp collisions at root s=8 TeV

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    Search for leptophobic Z ' bosons decaying into four-lepton final states in proton-proton collisions at root s=8 TeV

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    Search for black holes and other new phenomena in high-multiplicity final states in proton-proton collisions at root s=13 TeV

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    Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search

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    Search for heavy resonances decaying into a vector boson and a Higgs boson in final states with charged leptons, neutrinos, and b quarks

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    Phenomenological MSSM interpretation of CMS searches in pp collisions at √s=7 and 8 TeV

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    Searches for new physics by the CMS collaboration are interpreted in the framework of the phenomenological minimal supersymmetric standard model (pMSSM). The data samples used in this study were collected at root s = 7 and 8 TeV and have integrated luminosities of 5.0 fb(-1) and 19.5 fb(-1), respectively. A global Bayesian analysis is performed, incorporating results from a broad range of CMS supersymmetry searches, as well as constraints from other experiments. Because the pMSSM incorporates several well-motivated assumptions that reduce the 120 parameters of the MSSM to just 19 parameters defined at the electroweak scale, it is possible to assess the results of the study in a relatively straightforward way. Approximately half of the model points in a potentially accessible subspace of the pMSSM are excluded, including all pMSSM model points with a gluino mass below 500 GeV, as well as models with a squark mass less than 300 GeV. Models with chargino and neutralino masses below 200 GeV are disfavored, but no mass range of model points can be ruled out based on the analyses considered. The nonexcluded regions in the pMSSM parameter space are characterized in terms of physical processes and key observables, and implications for future searches are discussed

    Performance of reconstruction and identification of τ leptons decaying to hadrons and vτ in pp collisions at √s=13 TeV

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    The algorithm developed by the CMS Collaboration to reconstruct and identify τ leptons produced in proton-proton collisions at √s=7 and 8 TeV, via their decays to hadrons and a neutrino, has been significantly improved. The changes include a revised reconstruction of π⁰ candidates, and improvements in multivariate discriminants to separate τ leptons from jets and electrons. The algorithm is extended to reconstruct τ leptons in highly Lorentz-boosted pair production, and in the high-level trigger. The performance of the algorithm is studied using proton-proton collisions recorded during 2016 at √s=13 TeV, corresponding to an integrated luminosity of 35.9 fb¯¹. The performance is evaluated in terms of the efficiency for a genuine τ lepton to pass the identification criteria and of the probabilities for jets, electrons, and muons to be misidentified as τ leptons. The results are found to be very close to those expected from Monte Carlo simulation

    Particle-flow reconstruction and global event description with the CMS detector

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