411 research outputs found
ViTaLS -A Novel Link-Layer Scheduling Framework for Tactile Internet over Wi-Fi
No full textThe pioneering field of tactile Internet (TI) will enable the transfer of human skills over long distances through haptic feedback. Realizing this demands a roundtrip latency of sub-5 ms. In this work, we investigate the capability of Wi-Fi 6 and existing TI scheduling/multiplexing schemes in meeting this stringent latency constraint. Taking the concrete example of the state-of-the-art video-haptic multiplexer (VH-multiplexer), we highlight the pitfalls of relying on the existing Wi-Fi 6 systems for TI communication. To circumvent this, we propose video-tactile latency scheduler (ViTaLS) - a novel link layer framework for tuning the video-tactile frame transmissions to suit their heterogeneous Quality of Service requirements. We present a mathematical model to characterize the packet transmission duration of ViTaLS. Using a custom simulator, we validate our model and measure the objective performance improvement of ViTaLS over VH-multiplexer. We also present ViTaLS-optimal - a variant of ViTaLS, for further 4 reducing the tactile latency. Objectively, we show that ViTaLS-optimal yields a latency improvement of up to 82 %. Based on experiments conducted on a real TI testbed, we subjectively demonstrate that ViTaLS-optimal outperforms the VH-multiplexer.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Embedded System
L'imminence de la reencontré des "autres" reciproques: stratégies pour la reconnaissance des savoir pluriels
No full textEste texto da una mirada autocrítica desde la antropología a las políticas de exclusión de la tradición intelectual de Occidente y su marco social, político y económico, a los problemas de propiedad creados por estas políticas y, finalmente, a las posibles oportunidades de coarticular las ciencias oficiales y las ciencias del Otro.Cómo citar este artículo: DOVER, Robert VH, “El encuentro inminente de otros recíprocos: estrategias para el reconocimiento de saberes plurales”, Revista Educación y Pedagogía, Medellín, Universidad de Antioquia, Facultad de Educación, Vol. XVI, N.° 39, (mayo-agosto), 2004, pp. 13-25.Recibido: enero 2004Aceptado: mayo 2004This text gives an auto-critical look from anthropology to the exclusion policies and intellectual traditions in the West and its social, political and economical frame to the problems of private property created by these policies and, finally, to the potential opportunities to co articulate official sciences and the sciences otherness.How to reference this article: DOVER, Robert VH, “El encuentro inminente de otros recíprocos: estrategias para el reconocimiento de saberes plurales”, Revista Educación y Pedagogía, Medellín, Universidad de Antioquia, Facultad de Educación, Vol. XVI, N.° 39, (mayo-agosto), 2004, pp. 13-25.Received: january 2004Accepted: may 2004Ce texte porte un regard depuis l'anthropologie pour faire l'autocritique des politiques d'exclusion de la tradition intellectuelle d'occident et son cadre social, politique et économique, aussi q'aux problèmes de la propriété engendrés par ces politiques et finalement, on envisage des possibilités d'articulation entre les sciences officielles et celles de l 'Autre
Combined search for anomalous pseudoscalar HW couplings in VH(H -> b(b)over-bar) production and H -> VV decay
No full textA search for anomalous pseudoscalar couplings of the Higgs boson H to electroweak vector bosons V (= W or Z) in a sample of proton-proton collision events corresponding to an integrated luminosity of 18.9 fb(-1) at a center-of-mass energy of 8 TeV is presented. Events consistent with the topology of associated VH production, where the Higgs boson decays to a pair of bottom quarks and the vector boson decays leptonically, are analyzed. The consistency of data with a potential pseudoscalar contribution to the HVV interaction, expressed by the effective pseudoscalar cross section fractions f(a3), is assessed by means of profile likelihood scans. Results are given for the VH channels alone and for a combined analysis of the VH and previously published H -> VV channels. Under certain assumptions, f(a3)(ZZ) > 0.0034 is excluded at 95% confidence level in the combination. Scenarios in which these assumptions are relaxed are also considered. (C) 2016 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Combined search for anomalous pseudoscalar HW couplings in VH(H -> b(b)over-bar) production and H -> VV decay
No full textA search for anomalous pseudoscalar couplings of the Higgs boson H to electroweak vector bosons V (= W or Z) in a sample of proton-proton collision events corresponding to an integrated luminosity of 18.9 fb(-1) at a center-of-mass energy of 8 TeV is presented. Events consistent with the topology of associated VH production, where the Higgs boson decays to a pair of bottom quarks and the vector boson decays leptonically, are analyzed. The consistency of data with a potential pseudoscalar contribution to the HVV interaction, expressed by the effective pseudoscalar cross section fractions f(a3), is assessed by means of profile likelihood scans. Results are given for the VH channels alone and for a combined analysis of the VH and previously published H -> VV channels. Under certain assumptions, f(a3)(ZZ) > 0.0034 is excluded at 95% confidence level in the combination. Scenarios in which these assumptions are relaxed are also considered. (C) 2016 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Investigating the influence of drought on Sentinel-1 C-band SAR data over agricultural crops: A study in the Netherlands
No full textThe stress on global food security is expected to increase. Hence, crop and drought monitoring will become increasingly important in the future. Synthetic Aperture Radars (SAR) are able to penetrate clouds and thus reliably provide data. Despite the extensive literature that can be found on the use of high spatio-temporal resolution SAR data, a study investigating the influence of drought on Sentinel-1 data over agricultural crops has yet to be conducted. This research aims to bridge this knowledge gap by utilizing Sentinel-1 data. The Sentinel-1 data is acquired and processed in Google Earth Engine and afterwards, data analysis is performed using Python. This results in parcel level SAR (VV, VH and VH/VV) data. This research is focused on maize, sugar beet, potato, onion and barley parcels in study areas in the Netherlands during the 2017, 2018 and 2019 agricultural summer season, of which 2018 and 2019 were impacted heavily by drought. This research demonstrates that phenological changes are reflected in Sentinel-1 data with increasing backscatter intensities during leaf development and stem elongation phases. Subsequently, saturation occurs which halts the rapid increase of backscatter. During harvest, the VH/VV ratio decreases rapidly. Time series of barley behave differently due to its unique vertical structure.The results show that VV and VH backscatter values are 2.5, 2 and 1 dB lower during the 2018 drought compared to 2017 for maize, sugar beet and potato parcels, respectively. Furthermore, the seasonal VH/VV ratio cycle for maize, onion and barley is shorter in a drought year and shortest in 2018. The VH/VV ratio cycle in 2018 was 30, 10 and 20 days shorter compared to 2017 for maize, onion and barley, respectively. Lastly, significantly lower VH/VV ratio values are observed during the vegetative stages in 2019. The percentage of individual parcels that show responses similar to aggregated responses ranges from 68% to 100%. Moreover, the results show that the overpass time has a large influence on drought response. Morning passes show significant increase in the magnitude of the VV and VH backscatter drop during the drought periods, especially for sugar beet and potato.The regional variability was assessed by comparing parcel backscatter from the northern part of the Vechtstromen water board, the Scheldestromen water board and the Flevopolder. Generally, drought impact is found to be most extreme in Vechtstromen. However, onions in 2018 were impacted most in Scheldestromen according to yield data. This clearly translated into lower VH backscatter and VH/VV ratio values during and after the drought period. Also, regional differences in maize time series caused by irrigation are observed. The results show that areas in which irrigation was allowed with ground and open water had a longer VH/VV ratio cycle in 2018, compared to areas in which irrigation was allowed only with groundwater.Overall, the usage of Sentinel-1 data for drought monitoring purposes shows tremendous potential. This gives a promising outlook on the use of dense C-band SAR data for the detection of crop drought stress.Water Managemen
Combined search for anomalous pseudoscalar HW couplings in VH(H -> b(b)over-bar) production and H -> VV decay
No full textA search for anomalous pseudoscalar couplings of the Higgs boson H to electroweak vector bosons V (= W or Z) in a sample of proton-proton collision events corresponding to an integrated luminosity of 18.9 fb(-1) at a center-of-mass energy of 8 TeV is presented. Events consistent with the topology of associated VH production, where the Higgs boson decays to a pair of bottom quarks and the vector boson decays leptonically, are analyzed. The consistency of data with a potential pseudoscalar contribution to the HVV interaction, expressed by the effective pseudoscalar cross section fractions f(a3), is assessed by means of profile likelihood scans. Results are given for the VH channels alone and for a combined analysis of the VH and previously published H -> VV channels. Under certain assumptions, f(a3)(ZZ) > 0.0034 is excluded at 95% confidence level in the combination. Scenarios in which these assumptions are relaxed are also considered. (C) 2016 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
MULTI-CONFIGURATION STUDIES OF SOME LOW-LYING BOUND STATES OF VH
No full textAuthor Institution: Chemistry Division, Argonne National LaboratoryAb initio calculations using self-consistent field (SCF), multi-configuration self-consistent field (MCSCF) and a hybrid of MCSCF and configuration interaction (CI) methods in a basis of Slater-type orbitals (STO’s) of nominal accuracy are carried out for some low-Lying bound states of VH. All the lowest states of the symmetries , , , , , , , and that dissociate to the ground states of the constituent atoms are bound and so are some of the excited states which have higher-energy atomic dissociation products. Based upon Morse-curve fitting, the ground state is found to lead to the spectroscopic constants: eV, bohrs, . Potential curves for other low-lying bound states are also reported
Curriculum vitae : Jenkins, William L., President emeritus Louisiana State University system
No full textCurriculum vitae of the veterinarian William L. Jenkins. The curriculum vitae includes information about his education and career, scientific contributions and writings, homages and distinctions. William Louis Jenkins is a South African-born veterinary scientist who served as the fourth President of the Louisiana State University System in the USA until his retirement in 2007. He has delivered more than 200 lectures and addresses in the USA and internationally, written more than 60 scientific articles and is the co-author of a textbook on veterinary pharmacology. (Source: Wikipedia https://en.wikipedia.org/wiki/William_Jenkins_(veterinarian))ab202
Chiral Doublet Bands with vh(11/2) circle times vd(5/2)(-1) Configuration in the Particle Rotor Model
No full textDoublet bands with vh(11/2) circle times vd(5/2)(-1) configuration are studied for the first time via the triaxial particle rotor model. The main properties of the doublet bands, including the energy spectra and the electromagnetic transitions, are presented for different triaxiality parameter gamma. The aplanar rotation and chiral geometry are discussed based on the analysis of angular momentum components.Physics, MultidisciplinarySCI(E)中国科技核心期刊(ISTIC)0ARTICLE12null2
Sentinel-1 SAR Backscatter Response to Agricultural Drought in The Netherlands
No full textDrought is a major natural hazard that impacts agriculture, the environment, and socio-economic conditions. In 2018 and 2019, Europe experienced a severe drought due to below average precipitation and high temperatures. Drought stress affects the moisture content and structure of agricultural crops and can result in lower yields. Synthetic Aperture Radar (SAR) observations are sensitive to the dielectric and geometric characteristics of crops and underlying soils. This study uses data from ESA’s Sentinel-1 SAR satellite to investigate the influence of drought stress on major arable crops of the Netherlands, its regional variability and the impact of water management decisions on crop development. Sentinel-1 VV, VH and VH/VV backscatter data are used to quantify the variability in the spatio-temporal dynamics of agricultural crop parcels in response to drought. Results show that VV and VH backscatter values are 1 to 2 dB lower for crop parcels during the 2018 drought compared to values in 2017. In addition, the growth season indicated by the cross-ratio (CR, VH/VV) for maize and onion is shorter during the drought year. Differences due to irrigation restrictions are observed in backscatter response from maize parcels. Lower CR values in 2019 indicate the impact of drought on the start of the growing season. Results demonstrate that Sentinel-1 can detect changes in the seasonal cycle of arable crops in response to agricultural drought.Mathematical Geodesy and Positionin
- …
