1,745,961 research outputs found
Propagation of uncertainty from observing systems and NWP into hydrological models : COST-731 Working Group 2
Full text linkThe COST-731 action is focused on uncertainty propagation in hydrometeorological forecasting chains. Goals and activities of the action Working Group 2 are presented. Five foci for discussion and research have been identified: (1) understand uncertainties, (2) exploring, designing and comparing methodologies for the use of uncertainty in hydrological models, (3) providing feedback on sensitivity to data and forecast providers, (4) transferring methodologies among the different communities involved and (5) setting up test-beds and perform proof-of-concepts. Current examples of different perspectives on uncertainty propagation are presented. Copyright (C) 2010 Royal Meteorological Societ
Resolución UNRN N° 731/2009. Adjudicar contratación directa N° 24/2009
No full textFil: Universidad Nacional de Río Negro (U). Universidad Nacional de Río Negro. Río Negro, ArgentinaResolución UNRN N° 731/2009. Adjudicar contratación directa N° 24/2009fals
The COST 731 Action : a review on uncertainty propagation in advanced hydro-meteorological forecast systems
No full textQuantifying uncertainty in flood forecasting is a difficult task, given the multiple and strongly nonlinear
model components involved in such a system. Much effort has been and is being invested in
the quest of dealing with uncertain precipitation observations and forecasts and the propagation of
such uncertainties through hydrological and hydraulic models predicting river discharges and risk
for inundation. The COST 731 Action is one of these and constitutes a European initiative which
deals with the quantification of forecast uncertainty in hydro-meteorological forecast systems.
COST 731 addresses three major lines of development: (1) combining meteorological and
hydrological models to form a forecast chain, (2) propagating uncertainty information through this
chain and make it available to end users in a suitable form, (3) advancing high-resolution numerical
weather prediction precipitation forecasts by using non-conventional observations from, for
instance, radar to determine details in the initial conditions on scales smaller than what can be
resolved by conventional observing systems. Recognizing the interdisciplinarity of the challenge
COST 731 has organized its work forming Working Groups at the interfaces between the different
scientific disciplines involved, i.e. between observation and atmospheric (and hydrological)
modeling (WG-1), between atmospheric and hydrologic modelling (WG-2) and between hydrologic
modelling and end-users (WG-3).
This paper summarizes the COST 731 activities and its context, provides a review of the recent
progress made in dealing with uncertainties in flood forecasting, and sets the scene for the papers of
this Thematic Issue. In particular, a bibliometric analysis highlights the strong recent increase in
addressing the uncertainty analysis in flood forecasting from an integrated perspective. Such a
perspective necessarily involves the area of meteorology, hydrology, and decision making in order
to take operational advantage of the scientific progress, an aspect in which COST 731 is
successfully contributing to furthering the flood damage mitigation capabilities in Europe.Science Foundation IrelandOther funderEU COS
Medical experiments and Unit 731
No full textDiplomska naloga podrobno raziskuje delovanje enote 731 na Japonskem pred, med in po drugi svetovni vojni. Analiza je razdeljena na več tematskih sklopov, ki zajemajo osnovne informacije o enoti 731 in kratek pregled dogajanja na Japonskem med drugo svetovno vojno. Nato se osredotoča na ozadje in razloge za ustanovitev te enote, obravnava dejavnosti in vloge ključnih oseb znotraj enote, nazadnje pa še razloge za njen propad. Najpomembnejše ugotovitve in odkritja ter širše posledice obstoja enote 731 na japonsko družbo in mednarodno skupnost so predstavljeni v zaključku diplomske naloge.The following thesis thoroughly examines the operation of Unit 731 in Japan before, during and after World War II. The analysis is divided into several thematic sections, covering basic information about Unit 731 and a brief overview of events in Japan during World War II. It then focuses on the background and reasons for the establishment of the Unit, discusses the activities and roles of key individuals, and then the reasons for its demise. The most important findings and discoveries, as well as the broader implications of the existence of Unit 731 for Japanese society and the international community, are presented in the conclusion of the thesis
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Inscriptions 731 à 751
No full textInscriptions 731 à 751. In: Revue épigraphique du Midi de la France, tome 2, N°51, 1888. pp. 387-397
On the adjoint of Laplace’s tidal equations
Full text linkThe concept of the adjoint is regularly used in studies of both the resonances of physical systems and their response to external forcing. This report reviews the underlying theory involved in the adjoints of both differential equations and matrices and shows how the theory may be used to derive a physically meaningful adjoint to Laplace’s Tidal Equations.
Numerical models of the tides usually use a finite difference form of the tidal equations. The report investigates the adjoint properties of the finite difference equations. It shows that the are not necessarily symmetrical, i.e. the finite difference form of the adjoint tidal equations may not be the same as the adjoint of the normal finite difference equations. It also shows that, with a suitable choice of the way the boundary conditions and Coriolis terms are represented, the finite difference forms can be made symmetric
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