Results 81 to 90 of about 3,534,316 (293)
Schrödinger equations with indefinite weights in the whole space
Comptes Rendus. Mathématique, 2009 Abstract We consider in this Note equations defined in R N involving Schrodinger operators with indefinite weight functions and with potentials which tend to infinity at infinity. We give some results for the existence of principal eigenvalues and for the maximum principle. We also obtain Courant–Fischer formulas for such eigenvalues.
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On the representation of integers by quadratic forms
, 2006 Let Q be a non-singular quadratic form with integer coefficients. When Q is indefinite we provide new upper bounds for the least non-trivial integral solution to the equation Q=0. When Q is positive definite we provide improved upper bounds for the least
Browning, T. D., Dietmann, R.
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Market Expansion and Business Stealing With Differentiated Products Using a Nested Logit
Journal of Applied Econometrics, EarlyView.ABSTRACT In this paper, we use the widely adopted nested logit model to examine how introducing a new product into a market of highly substitutable, differentiated goods affects both market expansion and business stealing. Central to our analysis is the nesting parameter σ$$ \sigma $$, which captures the correlation in consumers' unobserved utilities ...
Christophe Bellégo, Andreea Enache
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Resonant nonlinear Neumann problems with indefinite weight
ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, 2012 We consider nonlinear Neumann problems driven by the p-Laplacian plus an indefinite potential. First we develop the spectral properties of such differential operators. Subsequently, using these spectral properties and variational methods based on critical point theory, truncation techniques and Morse theory, we prove existence and multiplicity theorems ...
MUGNAI, Dimitri, N. S. Papageorgiou
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Linear elliptic eigenvalue problems involving an indefinite weight
Journal of Mathematical Analysis and Applications, 1987 Die Verff. untersuchen lineare Eigenwertprobleme vom Typ \[ (Lu)(x)=\lambda m(x)u(x),\quad x\in \Omega, \] wobei L ein linearer, stark elliptischer Differentialoperator ist, \(\Omega\) ein Gebiet mit beschränktem Rand, sowie m(x) eine Funktion, die sowohl positive als auch negative Werte annimmt.
G. F. Roach, M Faierman
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On solvability of an indefinite Riccati equation [PDF]
, 2013 This note concerns a class of matrix Riccati equations associated with stochastic linear-quadratic optimal control problems with indefinite state and control weighting costs. A novel sufficient condition of solvability of such equations is derived, based
Du, Kai
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Frontiers in the Management of Orthopaedic Periprosthetic Joint Infection
Journal of Orthopaedic Research, EarlyView.ABSTRACT Periprosthetic joint infection (PJI) is a devastating complication of total joint arthroplasty (TJA), one of the most frequently performed surgical procedures worldwide. Management of acute PJI commonly involves debridement, antibiotics, and implant retention (DAIR), though failure rates remain high due to antibiotic‐tolerant biofilms. Chronic
Michael F. Shannon +9 more
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Antimaximum principle for elliptic problems with weight
Electronic Journal of Differential Equations, 1999 This paper is concerned with the antimaximum principle for the linear problem with weight $-Delta u = lambda m(x) u +h(x)$, under Dirichlet or Neumann boundary conditions.
T. Godoy, J.-P. Gossez, S. Paczka
doaj
The CM‐aGPi Network in the Generation of Tics in Tourette Syndrome
Movement Disorders, EarlyView.Abstract Background Tourette syndrome (TS) is a neurodevelopmental disorder characterized by intermittent involuntary, repetitive movements and vocalizations collectively referred to as tics. For participants with severe tics who are resistant to medication and behavioral therapy, deep brain stimulation (DBS) has emerged as a potential treatment ...
Grace Lowor +6 more
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Polymer Composites, EarlyView.Role of the modifications at the interface in glass fiber reinforced composites for damage monitoring. ABSTRACT Glass Fiber Reinforced Polymers (GFRPs) are widely used in structural applications but degrade over time due to internal damage. Structural Health Monitoring (SHM) enables early damage detection, improving reliability and reducing maintenance
Marta Colombo +10 more
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