Results 41 to 50 of about 2,094,916 (148)

Output Feedback Design for Parameter Varying Systems Subject to Persistent Disturbances and Control Rate Constraints

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT This paper develops a framework for designing output feedback controllers for constrained linear parameter‐varying systems that experience persistent disturbances. We specifically propose an incremental parameter‐varying output feedback control law to address control rate constraints, as well as state and control amplitude constraints.
Jackson G. Ernesto, Eugênio B. Castelan, Walter Lucia   +2 more
wiley   +1 more source

Comment on "Classification of Cosmic Scale Factor via Noether Gauge Symmetries" [Int. J. Theor. Phys. 54, 2343 (2015)]

, 2015
We discuss the relationship between the Noether point symmetries of the geodesic Lagrangian, in a (pseudo)Riemannian manifold, with the elements of the Homothetic algebra of the space.
Krishnakumar, K., Leach, P. G. L., Paliathanasis, A.   +2 more
core   +1 more source

High-dimensional nonparametric density estimation via symmetry and shape constraints [PDF]

Annals of Statistics, 2019
We tackle the problem of high-dimensional nonparametric density estimation by taking the class of log-concave densities on $\mathbb{R}^p$ and incorporating within it symmetry assumptions, which facilitate scalable estimation algorithms and can mitigate ...
Min Xu, R. Samworth
semanticscholar   +1 more source

Product churn, tastes, and price indices

American Journal of Agricultural Economics, EarlyView.
Abstract Price indices commonly used to measure inflation do not account for the entry and exit of products nor for systemic changes in consumer preferences over time. Recent developments in the theory of price indices show that these issues have significant impacts on the growth of prices that consumers experience.
Hao Lan, Tim Lloyd, Steve McCorriston, Cesar Revoredo‐Giha   +3 more
wiley   +1 more source

Normal forms of two-dimensional metrics admitting exactly one essential projective vector field

, 2019
We give a complete list of mutually non-diffeomorphic normal forms for the two-dimensional metrics that admit one essential (i.e., non-homothetic) projective vector field.
Manno, Gianni, Vollmer, Andreas
core   +1 more source

Taxing windfall money: A quasi‐experimental study

Contemporary Economic Policy, EarlyView.
Abstract This paper examines individuals' reaction to windfall income taxation. We take advantage of similar tax reforms on lottery winnings in Portugal and Spain in 2013 to study effects on lottery participation in both countries. Using a Synthetic Difference in Differences approach on a database of 348 draws from EuroMillions, our results indicate ...
Álvaro Muñiz‐Fernández, Levi Pérez
wiley   +1 more source

(Super-)integrable systems associated to 2-dimensional projective connections with one projective symmetry

, 2019
Projective connections arise from equivalence classes of affine connections under the reparametrization of geodesics. They may also be viewed as quotient systems of the classical geodesic equation.
Manno, Gianni, Vollmer, Andreas
core   +1 more source

Uneven Product Diversification: Explaining the Lag of Agricultural Economies

International Economic Review, EarlyView.
ABSTRACT This paper documents that agricultural sectors diversify less than other manufacturing activities. A simple model shows that this difference can contribute to welfare divergence in a way that is qualitatively different to what results when uneven growth happens in the intensive margin.
Guzmán Ourens
wiley   +1 more source

Invariant classification and the generalised invariant formalism: conformally flat pure radiation metrics, with zero cosmological constant

, 2010
Metrics obtained by integrating within the generalised invariant formalism are structured around their intrinsic coordinates, and this considerably simplifies their invariant classification and symmetry analysis. We illustrate this by presenting a simple
A. Barnes, A. Held, A. Held, A. Karlhede, A. Karlhede, A. Koutras, A. Koutras, A. Koutras, C.H. Brans, D. Pollney, E. Cartan, E. Newman, G. Ludwig, G. Ludwig, G.O. Papadopoulos, H. Stephani, I. Ozsváth, J. Collins, J. Collins, J. Collins, J. Podolský, J. Podolský, J.E.F. Skea, M. P. Machado Ramos, M.A.H. MacCallum, M.P. Machado Ramos, M.P. Machado Ramos, M.P. Machado Ramos, M.P. Machado Ramos, M.P. Machado Ramos, Michael Bradley, P. Wils, R. Geroch, R. Milson, S. Brian Edgar, S.B. Edgar, S.B. Edgar, S.B. Edgar, S.B. Edgar, S.B. Edgar, S.B. Edgar, S.B. Edgar, S.B. Edgar, W. Kundt, W. Kundt   +44 more
core   +1 more source

Price Indices Rekindled, 1970s–1990s: Theory and Practice at Cross Purposes?

Journal of Economic Surveys, EarlyView.
ABSTRACT This paper revisits the discussions on price indices during a period marked by theoretical advancements and practical challenges in measuring inflation. Index‐number theorists sought to improve accuracy, yet national statistical offices largely maintained established practices due to concerns over data availability, stability, and public trust.
Victor Cruz‐e‐Silva, Bert M. Balk
wiley   +1 more source