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- Aamodt, K., et al.
(författare)
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Alignment of the ALICE Inner Tracking System with cosmic-ray tracks
- 2010
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Ingår i: Journal of Instrumentation. - 1748-0221. ; 5
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Konferensbidrag (refereegranskat)abstract
- ALICE (A Large Ion Collider Experiment) is the LHC (Large Hadron Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-nucleus collisions at the LHC energies. The ALICE ITS, Inner Tracking System, consists of six cylindrical layers of silicon detectors with three different technologies; in the outward direction: two layers of pixel detectors, two layers each of drift, and strip detectors. The number of parameters to be determined in the spatial alignment of the 2198 sensor modules of the ITS is about 13,000. The target alignment precision is well below 10 mu m in some cases (pixels). The sources of alignment information include survey measurements, and the reconstructed tracks from cosmic rays and from proton-proton collisions. The main track-based alignment method uses the Millepede global approach. An iterative local method was developed and used as well. We present the results obtained for the ITS alignment using about 10(5) charged tracks from cosmic rays that have been collected during summer 2008, with the ALICE solenoidal magnet switched off.
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| 2. |
- Abgrall, N., et al.
(författare)
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The large enriched germanium experiment for neutrinoless double beta decay (LEGEND)
- 2017
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Ingår i: AIP Conference Proceedings. - : Author(s). - 1551-7616 .- 0094-243X. ; 1894
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Konferensbidrag (refereegranskat)abstract
- The observation of neutrinoless double-beta decay (0νββ) would show that lepton number is violated, reveal that neu-trinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective Majorana neutrino masses of 15 - 50 meV, will require a tonne-scale experiment with excellent energy resolution and extremely low backgrounds, at the level of ∼0.1 count /(FWHM·t·yr) in the region of the signal. The current generation 76Ge experiments GERDA and the Majorana Demonstrator, utilizing high purity Germanium detectors with an intrinsic energy resolution of 0.12%, have achieved the lowest backgrounds by over an order of magnitude in the 0νββ signal region of all 0νββ experiments. Building on this success, the LEGEND collaboration has been formed to pursue a tonne-scale 76Ge experiment. The collaboration aims to develop a phased 0νββ experimental program with discovery potential at a half-life approaching or at 1028 years, using existing resources as appropriate to expedite physics results.
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| 7. |
- Jin, Y., et al.
(författare)
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District household electricity consumption pattern analysis based on auto-encoder algorithm
- 2019
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Ingår i: IOP Conference Series: Materials Science and Engineering.
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Konferensbidrag (refereegranskat)abstract
- The energy shortage is one key issue for sustainable development, a potential solution of which is the integration with the renewable energy resources. However, the temporal sequential characteristic of renewable resources is different from traditional power grid. For the entire power grid, it is essential to match the energy generation side with the energy consumption side, so the load characteristic at the energy use side is crucial for renewable power integration. Better understanding of energy consumption pattern in buildings contributes to matching different source of energy generation. Under the background of integration of traditional and renewable energy, this research focuses on analysis of different household electricity consumption patterns in an urban scale. The original data is from measurement of daily energy consumption with smart meter in households. To avoid the dimension explosion phenomenon, the auto-encoder algorithm is introduced during the clustering analysis of daily electricity use data, which plays the role of principal component analysis. The clustering based on auto-encoder gives a clear insight into the urban electricity use patterns in household. During the data analysis, several feature variables are proposed, which include peak value, valley value and average value. The distinction analysis is also conducted to evaluate the analysis performance. The study takes households in Nanjing city, China as a case study, to conduct the clustering analysis on electricity consumption of residential buildings. The analysis results can be further applied, such as during the capacity design of district energy storage.
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| 9. |
- Margaritis, E., et al.
(författare)
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Soundscape mapping in the urban context : A case study in Sheffield
- 2015
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Ingår i: Book of Proceedings, AESOP Prague Annual Congress 2015. - Prague : Czech technical university. - 9788001057827
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- According to the recently published ISO 12913-1, soundscape differs from the acoustic environment, since the first refers to a perceptual construct, whilst the latter to a physical phenomenon. Noise exposure has been a main concern over the last decades, but from the planning viewpoint limited attention has been given to the perception of the acoustic environment and its representation at a city scale. This paper aims to establish a method for representing soundscape through source-related maps and secondly to correlate the sound sources with the urban context in terms of specific activities. Using a grid-based sampling methodology within the broader area of Sheffield city centre, soundscape data were collected in 90 spots, during morning and evening hours. Afterwards, soundscape variability for technological, anthropic and natural sounds was represented by maps using a Kriging interpolation technique in GIS. Preliminary results show how sound sources’ spatial variation in urban soundscapes is closely related to urban contexts and activities, therefore urban activities can be relevant for designing the soundscape of the urban realm. The paper ultimately points out how soundscape mapping can be used as a tool for planning purposes and urges to rethink the design process of the built environment also from the sonic viewpoint.
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| 10. |
- Van Renterghem, T., et al.
(författare)
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Road traffic noise reduction by vegetated low noise barriers in urban streets
- 2012
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Ingår i: Proceedings - 9th European Conference on Noise Control, EURONOISE 2012, Prague, 10-13 June 2012. - 2226-5147. - 9788001050132 ; , s. 944-948
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Konferensbidrag (refereegranskat)abstract
- Low-height noise barriers were shown to significantly reduce road traffic noise since these can be placed very close to either source or receiver. In this study, it is investigated to what extent such devices can be used in a street canyon setup. Full-wave numerical calculations have been carried out with the FDTD (finite-difference time-domain) method, the PSTD (pseudo-spectral time-domain) method and BEM (boundary element method). In addition, a combined ray model and radiosity (CRR) model has been used. Numerical results of the different wave-based methods have been cross-validated with satisfying agreement. The limitations of an energy-based method like CRR have been pointed out. 4-lane road traffic in a 19.2-m wide street canyon with a realistic façade profile has been considered. In the predictions, low screens are considered, covered by vegetated wall substrate. Different arrangements of such screens have been assessed, for receivers on walkways and distributed over the building facades. Road traffic noise could be reduced on walkways at low vehicle speeds, even when both sources and receivers are located in the same reverberant space. Some shielding for higher elevated receivers along facades is predicted as well. Absorption on the low-height noise barriers was shown to be essential to obtain positive effects.
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