Results 1 to 10 of about 689,864 (186)

Statistical and Systematic Errors in Measurement of Weak-Lensing Minkowski Functionals: Application to Canada-France-Hawaii Lensing Survey

, 2014
The measurement of cosmic shear using weak gravitational lensing is a challenging task that involves a number of complicated procedures. We study in detail the systematic errors in the measurement of weak lensing Minkowski Functionals (MFs). Specifically,
Shirasaki, Masato, Yoshida, Naoki
core   +1 more source

Measuring the local dark matter density [PDF]

, 2009
We examine systematic problems in determining the local matter density from the vertical motion of stars, i.e. the 'Oort limit'. Using collisionless simulations and a Monte Carlo Markov Chain technique, we determine the data quality required to detect ...
Garbari, Silvia, Lake, George, Read, Justin I.   +2 more
core   +1 more source

Bounding reproductive rates in state‐space models for animal population dynamics

Ecosphere, 2018
Time‐series models applied in the study of animal population dynamics commonly assume linearity on the log‐scale, leading to log‐normally distributed rates of increase.
Martin Sköld, Jonas Knape
doaj   +1 more source

Jointly interventional and observational data: estimation of interventional Markov equivalence classes of directed acyclic graphs

, 2013
In many applications we have both observational and (randomized) interventional data. We propose a Gaussian likelihood framework for joint modeling of such different data-types, based on global parameters consisting of a directed acyclic graph (DAG) and ...
Bühlmann, Peter, Hauser, Alain
core   +1 more source

Mesoscale subduction at the Almeria-Oran front. Part 2: biophysical interactions. [PDF]

, 2001
This paper presents a detailed diagnostic analysis of hydrographic and current meter data from three, rapidly repeated, fine-scale surveys of the Almeria–Oran front.
Allen, Allen, Allen, Arnone, Arnone, Ashjian, B Rabe, Bainbridge, Baussant, Beaulieu, Bianchi, Boucher, Boucher, Cheney, Claustre, Crisp, Crisp, Crowder, DePalma, Dewey, Fiala, Flagg, Folkard, Franks, Franks, Gascard, Gorsky, Govoni, Griffiths, H.S.J Roe, Haury, Heburn, Herman, Herring, Heywood, Hobson, Hood, Huntley, J.T Allen, Johnson, L'Helguen, L'Helguen, Le Fèvre, Lillibridge, Lohrenz, Longhurst, M.C Hartman, Magnuson, McClain, Murav'yev, N Crisp, Nash, Okubo, Olson, Olson, Olson, Ortner, Ortner, Owen, Perkins, Perkins, Plueddemann, Pollard, Pollard, Prieur, Prieur, Rabe, Roe, S Fielding, Seguin, Sournia, Sournia, Strass, Thibault, Tintore, Videau, Viúdez, Williams, Wishner, Yoder, Zakardjian   +80 more
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Observation errors in early historical upper‐air observations [PDF]

Journal of Geophysical Research: Atmospheres, 2013
Upper‐air observations are a fundamental data source for global atmospheric data products, but uncertainties, particularly in the early years, are not well known. Most of the early observations, which have now been digitized, are prone to a large variety of undocumented uncertainties (errors) that need to be quantified, e.g., for their assimilation in ...
Wartenburger, Richard, Brönnimann, Stefan, Stickler, Alexander   +2 more
openaire   +2 more sources

Measuring the quality of observational study data in an international HIV research network. [PDF]

PLoS ONE, 2012
Observational studies of health conditions and outcomes often combine clinical care data from many sites without explicitly assessing the accuracy and completeness of these data.
Stephany N Duda, Bryan E Shepherd, Cynthia S Gadd, Daniel R Masys, Catherine C McGowan   +4 more
doaj   +1 more source

A reexamination of methods for evaluating the predictability of the atmosphere [PDF]

Nonlinear Processes in Geophysics, 1997
Pioneering work by Lorenz (1965, 1968, 1969) developed a number of methods for exploring the limits of predictability of the atmosphere. One method uses an integration of a realistic numerical model as a surrogate for the atmosphere.
J. L. Anderson, V. Hubeny
doaj  

Deep Space Network Measurement Model Development for Interplanetary Mission [PDF]

Journal of Astronomy and Space Sciences, 2004
The DSN(Deep Space Network) measurement model for interplanetary navigations which is essential for precise orbit determination has been developed. The DSN measurement model produces fictitious DSN observables such as range, doppler and angular data ...
Hae-Yeon Kim, Eun-Seo Park, Young-Joo Song, Sung-Moon Yoo, Kyung-Min Rho, Sang-Young Park, Kyu-Hong Choi, Jae-Cheol Yoon, Jo-Ryeong Yim, Jun-Min Choi, Byung-Kyo Kim   +10 more
doaj   +1 more source

On Variational Data Assimilation in Continuous Time

, 2010
Variational data assimilation in continuous time is revisited. The central techniques applied in this paper are in part adopted from the theory of optimal nonlinear control.
Apte, Bröcker, Childs, Courtier, Derber, Farmer, Jazwinsky, Judd, Judd, Judd, Kierzenka, Le Dimet, Lorenz, Lorenz, Pereyra, Pires, Rabier, Ridout, Sage, Sontag, Talagrand, Tremolet   +21 more
core   +1 more source