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Free decay and excitation of the chandler wobble: self-consistent estimates of the period and quality factor / Wei Chen in Journal of geodesy, vol 97 n° 4 (April 2023)  

Public [article]  inJournal of geodesy > vol 97 n° 4 (April 2023) . - n° 36 Titre : Free decay and excitation of the chandler wobble: self-consistent estimates of the period and quality factor Type de document : Article/Communication Auteurs : Wei Chen, Auteur ; Yifei Chen, Auteur ; et al., Auteur Année de publication : 2023 Article en page(s) : n° 36 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] mouvement du pôle [Termes IGN] terme de Chandler Résumé : (auteur) The period TCW and quality factor QCW of the Chandler wobble (CW) as well as polar motion (PM) transfer functions are all determined by the Earth’s layered structure, mass distribution, elasticity, rheology and energy dissipation, via the Earth’s dynamic figure parameters and complex degree-2 Love numbers. However, most previous studies used geophysical excitations derived from real-valued PM transfer functions to invert for TCW and QCW, thus leading to results that are not self-consistent. By separating the observed PM into the freely decaying CW and the excited PM, a traverse-based method is proposed to search values of TCW and QCW that can fit both sides simultaneously, yielding the self-consistent estimates of TCW = 430.4 mean solar days and QCW = 130. This implies the degree-2 tidal Love number k = 0.35011 − 0.00226i and load Love number k' =  − 0.36090 + 0.00233i, and the PM transfer functions TNL = 1.80001 − 0.00692i (non-loading) and TL = 1.15040 − 0.00023i (loading) valid at the Chandler period. Numéro de notice : A2023-176 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s00190-023-01727-z Date de publication en ligne : 10/04/2023 En ligne : https://doi.org/10.1007/s00190-023-01727-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=103287 [article]

Interactive map to illustrate seat distributions of political party support levels : a web GIS application / Yifei Chen in Cartographica, vol 51 n° 3 (Fall 2016)  

Public [article]  inCartographica > vol 51 n° 3 (Fall 2016) . - pp 147 - 158 Titre : Interactive map to illustrate seat distributions of political party support levels : a web GIS application Type de document : Article/Communication Auteurs : Yifei Chen, Auteur ; Andrea M. L. Perrella, Auteur Année de publication : 2016 Article en page(s) : pp 147 - 158 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique [Termes IGN] carte de répartition par points [Termes IGN] carte interactive [Termes IGN] élection [Termes IGN] interactivité [Termes IGN] web mapping Résumé : (Auteur) Canada's new electoral order of 338 districts, updated in October 2013, was in effect for the October 2015 federal election. A Web GIS application was developed using the new electoral map to display seat projections generated by the Laurier Institute for the Study of Public Opinion and Policy (LISPOP). Seat projections convert, or “project,” public opinion support for the major political parties into a distribution of electoral seats for each party, based on a detailed analysis of an aggregation of polls. The map was published through ArcGIS Server, and coding language HTML and JavaScript implemented the required functions. Two key interactive features of the map include: (1) pop-up windows that provide the 2011 election result and LISPOP's current seat projection when hovering over a constituency; and (2) a drop-down menu that direct users to a desired region. The use of ArcGIS software enables fast and effective updates before and during the election. Numéro de notice : A2016-728 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/cart.51.3.3288 En ligne : http://dx.doi.org/10.3138/cart.51.3.3288 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82272 [article]

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