59 research outputs found
Production of renewable fuel and value-added bioproducts using pineapple leaves in Costa Rica
Pineapple, Ananas comosus, is one of the most important cash crops in Costa Rica with more than 44,500 ha of plantation. The pineapple industry contributes approximately 1.7% of the gross domestic product (GDP) of Costa Rica. Pineapple cultivation generates a large amount of plant residues (250 metric tons per hectare of wet plant residues mainly leaves). Current practices of the field residue handing include direct burning, in situ decomposition and removal of residue before planting, which are neither economically sound nor environmentally friendly. New approaches are urgently needed to utilize the residues and improve sustainability of pineapple production in Costa Rica. This study developed a simple, efficient process to convert the pineapple plant leaves into bioethanol, spent yeast proteins, and fibrous material (pulp). The residue was first treated by a mechanical extruder to generate juice and fibrous material. The juice was fermented by a yeast, Kluyveromyces marxianus, to produce ethanol and spent yeast proteins. Under the selected process conditions, the plant leaves (125 tons fresh weight per year) from 1 ha can generate 2.1 tons of bio-ethanol, 1.55 tons of spent yeast biomass, and 11.65 tons of dry fibrous material. The mass and energy balance analysis concluded that using the studied process, the pineapple plant leaves from 44,500 ha of pineapple plantation in Costa Rica can produce 93,043, 68,975, and 518,425 tons of bioethanol, spent yeast, and fibrous material per year, respectively. The amount of bioethanol is able to replace approximately 8.51% of transportation fossil fuel consumption in Costa Rica.Michigan State University/[]/MSU/Estados UnidosNational Natural Science Foundation of China/[31701533]/NSFC/ChinaProgram of Study Abroad for Young Scholars/[gxgwfx 2018036]//Estados UnidosUCR::VicerrectorĂa de Docencia::IngenierĂa::Facultad de IngenierĂa::Escuela de IngenierĂa de Biosistema
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Luminosity determination using Z boson production at the CMS experiment
Data Availability Statement - This manuscript has no associated data or
the data will not be deposited. [Authorsâ comment: Release and preser
vation of data used by the CMS Collaboration as the basis for publi
cations is guidedbytheCMSpolicyasstatedinhttps://cms-docdb.cern.
ch/cgibin/PublicDocDB/RetrieveFile?docid=6032&filename=CMSD
ataPolicyV1.2.pdf&version=2. CMS data preservation,re-use and open
access policy.]The measurement of ZÂ boson production is presented as a method to determine the integrated luminosity of CMS data sets. The analysis uses protonâproton collision data, recorded by the CMS experiment at the CERN LHC in 2017 at a center-of-mass energy of 13 TeV . Events with ZÂ bosons decaying into a pair of muons are selected. The total number of ZÂ bosons produced in a fiducial volume is determined, together with the identification efficiencies and correlations from the same data set, in small intervals of 20 pb-1 of integrated luminosity, thus facilitating the efficiency and rate measurement as a function of time and instantaneous luminosity. Using the ratio of the efficiency-corrected numbers of ZÂ bosons, the precisely measured integrated luminosity of one data set is used to determine the luminosity of another. For the first time, a full quantitative uncertainty analysis of the use of Z bosons for the integrated luminosity measurement is performed. The uncertainty in the extrapolation between two data sets, recorded in 2017 at low and high instantaneous luminosity, is less than 0.5%. We show that the ZÂ boson rate measurement constitutes a precise method, complementary to traditional methods, with the potential to improve the measurement of the integrated luminosity.SCOAP
Richness, composition and trophic groups of an avian community in the Pernambuco Endemism Centre, Alagoas, Brazil
Laringectomias supracricĂłides: revisĂŁo de literatura em protocolos de qualidade de vida
Search for Higgs Boson Pair Production in the Four b Quark Final State in Proton-Proton Collisions at root s=13 TeV
Search for invisible decays of the Higgs boson produced via vector boson fusion in proton-proton collisions at root s=13 TeV
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A search for new physics in central exclusive production using the missing mass technique with the CMS detector and the CMS-TOTEM precision proton spectrometer
Data availability statement:
This manuscript has no associated data or the data will not be deposited. [Authorsâ comment: Release and preservation of data used by the CMS Collaboration as the basis for publications is guided by theCMSpolicy as stated in https://cms-docdb.cern.ch/cgi-bin/PublicDocDB/RetrieveFile?docid=6032filename=CMSDataPolicyV1.2.pdfversion=2 CMS data preservation, re-use and open access policy.]Copyright © CERN for the benefit of the CMS and TOTEM collaborations 2023. A generic search is presented for the associated production of a Z boson or a photon with an additional unspecified massive particle X, ppâpp+Z/Îł+X, in proton-tagged events from protonâproton collisions at sâ=13TeV, recorded in 2017 with the CMS detector and the CMS-TOTEM precision proton spectrometer. The missing mass spectrum is analysed in the 600â1600 GeV range and a fit is performed to search for possible deviations from the background expectation. No significant excess in data with respect to the background predictions has been observed. Model-independent upper limits on the visible production cross section of ppâpp+Z/Îł+X are set.Funded by SCOAP3. SCOAP3 supports the goals of the International Year of Basic Sciences for Sustainable Development
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Measurement of the production cross section for a W boson in association with a charm quark in protonâproton collisions at âs=13TeV
Data Availability:
This manuscript has no associated data or the data will not be deposited. [Authorsâ comment: Release and preservation of data used by the CMS Collaboration as the basis for publications is guided by the CMS policy as stated in https://cms-docdb.cern.ch/cgi-bin/PublicDocDB/RetrieveFile?docid=6032 &filename=CMSDataPolicyV1.2.pdf &version=2. CMS data preservation, re-use and open access policy].A preprint version of the article is available at arXiv: https://arxiv.org/abs/2308.02285 .The strange quark content of the proton is probed through the measurement of the production cross section for a W boson and a charm (c) quark in protonâproton collisions at a center-of-mass energy of 13 TeV . The analysis uses a data sample corresponding to a total integrated luminosity of 138 fb-1 collected with the CMS detector at the LHC. The W bosons are identified through their leptonic decays to an electron or a muon, and a neutrino. Charm jets are tagged using the presence of a muon or a secondary vertex inside the jet. The W + c production cross section and the cross section ratio Rc±=Ï(W++cÂŻ)/Ï(W-+c) are measured inclusively and differentially as functions of the transverse momentum and the pseudorapidity of the lepton originating from the W boson decay. The precision of the measurements is improved with respect to previous studies, reaching 1% in Rc±=0.950±0.005(stat)±0.010(syst) . The measurements are compared with theoretical predictions up to next-to-next-to-leading order in perturbative quantum chromodynamics.SCOAP
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