243 research outputs found
Measurement of hadron composition in charged jets from pp collisions with the ALICE experiment
We report the first measurement of charged pion, kaon and (anti-)proton
production in jets from hadron colliders. The measurement was carried out with
the ALICE detector using minimum bias pp collisions at a
centre-of-mass energy of TeV at the LHC. We present the , K
and p transverse momentum () spectra, as well as the spectra of
the reduced momentum (), in charged jets
of between 5--20 . The measurement is compared
to Monte Carlo calculations.Comment: 4 pages, 4 figures, Proceedings of XXIV International Conference on
Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2014), May 19-24,
2014, Darmstad
Exploring the performance limits of the ALICE Time Projection Chamber and Transition Radiation Detector for measuring identified hadron production at the LHC
The Time Projection Chamber (TPC) and Transition Radiation Detector (TRD) are the
main tracking and particle identification devices in the ALICE experiment at the CERN
LHC. This thesis studies aspects of their performance beyond the original designs. This
includes extending the TPC momentum measurement for cosmic rays to sub-TeV scale,
investigating a robust identification method for electrons and hadrons by the TRD, and
developing new approaches to characterize the TPC and TRD signals. These studies lead
to an intriguing observation of the transition radiation from sub-TeV cosmic muons, and
a universal method -- the TPC coherent fit -- to extract yields of different particle species
with momentum from 0.5 to above 20 GeV/c.
With the TPC coherent fit, transverse momentum spectra (0.6 < pt < 20 GeV/c) of pions,
kaons and protons at mid-rapidity (|y|<~0.8) in pp collisions at sqrt(s) = 2.76 and 7 TeV and
Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV at the LHC are measured. In this unified approach
both the anomalous enhancement of the proton-to-pion ratio at moderate pt (2-8 GeV/c)
(the so-called baryon anomaly) and the nuclear modification of particle yields up to
high pt (> 10 GeV/c) in Pb-Pb collisions are observed. The particle production is also
studied in jets from pp collisions at 7 TeV and the results are well described by Perugia-0
tune of PYTHIA6
Pion-proton correlation in neutrino interactions on nuclei
In neutrino-nucleus interactions, a proton produced with a correlated pion
might exhibit a left-right asymmetry relative to the lepton scattering plane
even when the pion is absorbed. Absent in other proton production mechanisms,
such an asymmetry measured in charged-current pionless production could reveal
the details of the absorbed-pion events that are otherwise inaccessible. In
this study, we demonstrate the idea of using final-state proton left-right
asymmetries to quantify the absorbed-pion event fraction and underlying
kinematics. This technique might provide critical information that helps
constrain all underlying channels in neutrino-nucleus interactions in the GeV
regime.Comment: 7 pages, 4 figure
Abundance changes of marsh plant species over 40 years are better explained by niche position water level than functional traits
Acknowledgements: This study was supported by the National Natural Science Foundation of China (grants No.41671109 and 41371107) and by the Natural Science Foundation of Jilin Province (grant No. 20190201281JC). We thank Xiaofeng Xu for the suggestions and Håkan Rydin for the comments on the manuscript.Peer reviewedPostprin
Bim-Based Risk Identification System in tunnel construction
This paper presents an innovative approach of integrating Building Information Modeling (BIM) and expert systems to address deficiencies in traditional safety risk identification process in tunnel construction. A BIM-based Risk Identification Expert System (B-RIES) composed of three main built-in subsystems: BIM extraction, knowledge base management, and risk identification subsystems, is proposed. The engineering parameter information related to risk factors is first extracted from BIM of a specific project where the Industry Foundation Classes (IFC) standard plays a bridge role between the BIM data and tunnel construction safety risks. An integrated knowledge base, consisting of fact base, rule base and case base, is then established to systematize the fragmented explicit and tacit knowledge. Finally, a hybrid inference approach, with case-based reasoning and rule-based reasoning combined, is developed to improve the flexibility and comprehensiveness of the system reasoning capacity. B-RIES is used to overcome low-efficiency in traditional information extraction, reduce the dependence on domain experts, and facilitate knowledge sharing and communication among dispersed clients and domain experts. The identification of a safety hazard regarding the water gushing in one metro station of China is presented in a case study. The results demonstrate the feasibility of B-RIES and its application effectiveness
Reconstruction of interactions in the ProtoDUNE-SP detector with Pandora
The Pandora Software Development Kit and algorithm libraries provide pattern-recognition logic essential to the reconstruction of particle interactions in liquid argon time projection chamber detectors. Pandora is the primary event reconstruction software used at ProtoDUNE-SP, a prototype for the Deep Underground Neutrino Experiment far detector. ProtoDUNE-SP, located at CERN, is exposed to a charged-particle test beam. This paper gives an overview of the Pandora reconstruction algorithms and how they have been tailored for use at ProtoDUNE-SP. In complex events with numerous cosmic-ray and beam background particles, the simulated reconstruction and identification efficiency for triggered test-beam particles is above 80% for the majority of particle type and beam momentum combinations. Specifically, simulated 1 GeV/c charged pions and protons are correctly reconstructed and identified with efficiencies of 86.
Spatiotemporal variation of marsh vegetation productivity and climatic effects in Inner Mongolia, China
Net primary productivity (NPP) is a vital ecological index that reflects the ecological function and carbon sequestration of marsh ecosystem. Inner Mongolia has a large area of marshes, which play a crucial role in the East Asian carbon cycle. Under the influence of climate change, the NPP of Inner Mongolian marsh has changed significantly in the past few decades, but the spatiotemporal variation in marsh vegetation NPP and how climate change affects marsh NPP remain unclear. This study explores, for the first time, the spatiotemporal variation of marsh NPP and its response to climatic change in Inner Mongolia based on the MODIS-NPP and climate datasets. We find that the long-term average annual NPP of marsh is 339.85 g⋅C/m2 and the marsh NPP shows a significantly increasing trend (4.44 g⋅C/m2/a; p < 0.01) over Inner Mongolia during 2000–2020. Spatially, the most prominent increase trend of NPP is mainly distributed in the northeast of the region (Greater Khingan Mountains). The partial correlation results show that increasing autumn and summer precipitation can increase the NPP of marsh vegetation over Inner Mongolia. Regarding the temperature effects, we observe a strong asymmetric effect of maximum (Tmax) and minimum (Tmin) temperature on annual NPP. A high spring Tmax can markedly increase marsh NPP in Inner Mongolia, whereas a high Tmin can significantly reduce it. In contrast to spring temperature effects on NPP, a high summer Tmax can decrease NPP, whereas a high Tmin can increase it. Our results suggest different effects of seasonal climate conditions on marsh vegetation productivity and highlight the influences of day-time and night-time temperatures. This should be considered in simulating and predicting marsh carbon sequestration in global arid and semi-arid regions
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