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##### Publikasjoner (7 av 7) Visa alla publikasjoner
Ghosh, A., Kozlov, V., Nazarov, S. A. & Rule, D. (2018). A Two Dimensional Model of the Thin Laminar Wall of a Curvilinear Flexible Pipe.
Åpne denne publikasjonen i ny fane eller vindu >>A Two Dimensional Model of the Thin Laminar Wall of a Curvilinear Flexible Pipe
2018 (engelsk)Rapport (Annet vitenskapelig)
##### Abstract [en]

We present a two dimensional model describing the elastic behaviour of the wall of a curved pipe to model blood vessels in particular. The wall has a laminate structure consisting of several anisotropic layers of varying thickness and is assumed to be much smaller in thickness than the radius of the vessel which itself is allowed to vary. Our two-dimensional model takes the interaction of the wall with the surrounding material and the fluid flowing inside into account and is obtained via a dimension reduction procedure. The curvature and twist of the vessel axis as well as the anisotropy of the laminate wallpresent the main challenges in applying the dimension reduction procedure so plenty of examples of canonical shapes of vessels and their walls are supplied with explicit systems of dierential equations at the end.

s. 20
##### Serie
LiTH-MAT-R, ISSN 0348-2960 ; 6
##### Identifikatorer
urn:nbn:se:liu:diva-148014 (URN)LiTH-MAT-R--2018/06--SE (ISRN)
Tilgjengelig fra: 2018-05-24 Laget: 2018-05-24 Sist oppdatert: 2018-05-24bibliografisk kontrollert
Dindos, M., Pipher, J. & Rule, D. (2017). Boundary value problems for second order elliptic operators satisfying a Carleson condition. Communications on Pure and Applied Mathematics, 70(7), 1316-1365
Åpne denne publikasjonen i ny fane eller vindu >>Boundary value problems for second order elliptic operators satisfying a Carleson condition
2017 (engelsk)Inngår i: Communications on Pure and Applied Mathematics, ISSN 0010-3640, E-ISSN 1097-0312, Vol. 70, nr 7, s. 1316-1365Artikkel i tidsskrift (Fagfellevurdert) Published
##### Abstract [en]

Let be a Lipschitz domain in Rn n ≥ 2, and L = divA∇· be a second order elliptic operator in divergence form. We establish solvability of the Dirichlet regularity problem with boundary data in H1,p(@) and of the Neumann problem with Lp(@) data for the operator L on Lipschitz domains with small Lipschitz con- stant. We allow the coefficients of the operator L to be rough obeying a certain Carleson condition with small norm. These results complete the results of [7] where the Lp(@) Dirichlet problem was considered under the same assumptions and [8] where the regularity and Neumann problems were considered on two dimensional domains.

##### Emneord
Elliptic equations, Carleson measures, Boundary value problems, Lipschitz domains
##### Identifikatorer
urn:nbn:se:liu:diva-125452 (URN)10.1002/cpa.21649 (DOI)000401720800003 ()

Funding agencies: Engineering and Physical Sciences Research Council [EP/J017450/1]; National Science Foundation DMS Grant [0901139]; CANPDE

Tilgjengelig fra: 2016-02-24 Laget: 2016-02-24 Sist oppdatert: 2017-06-13
Auscher, P., Rosén, A. & Rule, D. (2015). Boundary value problems for degenerate elliptic equations and systems. Annales Scientifiques de l'Ecole Normale Supérieure, 48(4), 951-1000
Åpne denne publikasjonen i ny fane eller vindu >>Boundary value problems for degenerate elliptic equations and systems
2015 (engelsk)Inngår i: Annales Scientifiques de l'Ecole Normale Supérieure, ISSN 0012-9593, E-ISSN 1873-2151, Vol. 48, nr 4, s. 951-1000Artikkel i tidsskrift (Fagfellevurdert) Published
##### sted, utgiver, år, opplag, sider
SOC MATHEMATIQUE FRANCE, 2015
##### Emneord
Littlewood-Paley estimates, functional calculus, bound- ary value problems, second order elliptic equations and systems, weighted norm inequalities.
##### Identifikatorer
urn:nbn:se:liu:diva-108467 (URN)000363439300006 ()

Funding agencies: ANR project "Harmonic analysis at its boundaries" [ANR-12-BS01-0013-01]; Swedish Research Council, VR [621-2011-3744]

Tilgjengelig fra: 2014-06-27 Laget: 2014-06-27 Sist oppdatert: 2017-12-05
Rodríguez-López, S., Rule, D. & Staubach, W. (2015). On the boundedness of certain bilinear oscillatory integral operators. Transactions of the American Mathematical Society, 367(10), 6971-6995
Åpne denne publikasjonen i ny fane eller vindu >>On the boundedness of certain bilinear oscillatory integral operators
2015 (engelsk)Inngår i: Transactions of the American Mathematical Society, ISSN 0002-9947, E-ISSN 1088-6850, Vol. 367, nr 10, s. 6971-6995Artikkel i tidsskrift (Fagfellevurdert) Published
##### Abstract [en]

We prove the global L2 × L2 → L1 boundedness of bilinear oscillatory integral operators with amplitudes satisfying a Hörmander type condition and phases satisfying appropriate growth as well as the strong non-degeneracy conditions. This is an extension of the corresponding result of R. Coifman and Y. Meyer for bilinear pseudo-differential operators, to the case of oscillatory integral operators.

##### sted, utgiver, år, opplag, sider
American Mathematical Society (AMS), 2015
##### Emneord
oscillatory integral operators, bilinear, T(1) Theorem, commutators
##### Identifikatorer
urn:nbn:se:liu:diva-94272 (URN)000360988500008 ()

Funding: Crawfoord Foundation;  [MTM2010-14946]

Tilgjengelig fra: 2013-06-20 Laget: 2013-06-20 Sist oppdatert: 2017-12-06
Rodríguez-López, S., Rule, D. & Staubach, W. (2014). A Seeger-Sogge-Stein theorem for bilinear Fourier integral operators. Advances in Mathematics, 264, 1-54
Åpne denne publikasjonen i ny fane eller vindu >>A Seeger-Sogge-Stein theorem for bilinear Fourier integral operators
2014 (engelsk)Inngår i: Advances in Mathematics, ISSN 0001-8708, E-ISSN 1090-2082, Vol. 264, s. 1-54Artikkel i tidsskrift (Fagfellevurdert) Published
##### Abstract [en]

We establish the regularity of bilinear Fourier integral operators with bilinear amplitudes in

and non-degenerate phase functions, from Lp×Lq→Lr under the assumptions that

and . This is a bilinear version of the classical theorem  of Seeger–Sogge–Stein concerning the Lp boundedness of linear Fourier integral operators. Moreover, our result goes beyond the aforementioned theorem in that it also includes the case of quasi-Banach target spaces.

Elsevier, 2014
##### Emneord
Bilinear Fourier integral operators, Frequency space localization
##### Identifikatorer
urn:nbn:se:liu:diva-108466 (URN)10.1016/j.aim.2014.07.009 (DOI)000341615100001 ()2-s2.0-84904650922 (Scopus ID)
Tilgjengelig fra: 2014-06-27 Laget: 2014-06-27 Sist oppdatert: 2017-12-05bibliografisk kontrollert
Michalowski, N., Rule, D. & Staubach, W. (2014). Multilinear pseudodifferential operators beyond Calderón–Zygmund theory. Journal of Mathematical Analysis and Applications, 414(1), 149-165
Åpne denne publikasjonen i ny fane eller vindu >>Multilinear pseudodifferential operators beyond Calderón–Zygmund theory
2014 (engelsk)Inngår i: Journal of Mathematical Analysis and Applications, ISSN 0022-247X, E-ISSN 1096-0813, Vol. 414, nr 1, s. 149-165Artikkel i tidsskrift (Fagfellevurdert) Published
##### Abstract [en]

We consider two types of multilinear pseudodifferential operators. First, we prove the boundedness of multilinear pseudodifferential operators with symbols which are only measurable in the spatial variables in Lebesgue spaces. These results generalise earlier work of the present authors concerning linear pseudo-pseudodifferential operators. Secondly, we investigate the boundedness of bilinear pseudodifferential operators with symbols in the Hormander S-p,delta(m) classes. These results are new in the case p less than 1, that is, outwith the scope of multilinear Calderon-Zygmund theory.

Elsevier, 2014
##### Emneord
Multilinear pseudodifferential operators; Hormander class symbols; Mixed norm estimates; Bilinear pseudodifferential operators
##### Identifikatorer
urn:nbn:se:liu:diva-105892 (URN)10.1016/j.jmaa.2013.12.062 (DOI)000332194700013 ()2-s2.0-84893981279 (Scopus ID)
Tilgjengelig fra: 2014-04-14 Laget: 2014-04-12 Sist oppdatert: 2017-12-05bibliografisk kontrollert
Carbery, A., Maz'ya, V., Mitrea, M. & Rule, D. (2014). The integrability of negative powers of the solution of the Saint Venant problem. Annali della Scuola Normale Superiore di Pisa (Classe Scienze), Serie V, XIII(2), 465-531
Åpne denne publikasjonen i ny fane eller vindu >>The integrability of negative powers of the solution of the Saint Venant problem
2014 (engelsk)Inngår i: Annali della Scuola Normale Superiore di Pisa (Classe Scienze), Serie V, ISSN 0391-173X, E-ISSN 2036-2145, Vol. XIII, nr 2, s. 465-531Artikkel i tidsskrift (Fagfellevurdert) Published
##### Abstract [en]

We initiate the study of the finiteness condition∫ Ω u(x) −β dx≤C(Ω,β)<+∞ whereΩ⊆R n is an open set and u is the solution of the Saint Venant problem Δu=−1 in Ω , u=0 on ∂Ω . The central issue which we address is that of determining the range of values of the parameter β>0 for which the aforementioned condition holds under various hypotheses on the smoothness of Ω and demands on the nature of the constant C(Ω,β) . Classes of domains for which our analysis applies include bounded piecewise C 1 domains in R n , n≥2 , with conical singularities (in particular polygonal domains in the plane), polyhedra in R 3 , and bounded domains which are locally of classC 2 and which have (finitely many) outwardly pointing cusps. For example, we show that if u N is the solution of the Saint Venant problem in the regular polygon Ω N with N sides circumscribed by the unit disc in the plane, then for each β∈(0,1) the following asymptotic formula holds: % {eqnarray*} \int_{\Omega_N}u_N(x)^{-\beta}\,dx=\frac{4^\beta\pi}{1-\beta} +{\mathcal{O}}(N^{\beta-1})\quad{as}\,\,N\to\infty. {eqnarray*} % One of the original motivations for addressing the aforementioned issues was the study of sublevel set estimates for functions v satisfying v(0)=0 , ∇v(0)=0 and Δv≥c>0 .

##### sted, utgiver, år, opplag, sider
Scuola Normale Superiore, 2014
##### Identifikatorer
urn:nbn:se:liu:diva-108526 (URN)000339985500008 ()2-s2.0-84908458320 (Scopus ID)
Tilgjengelig fra: 2014-06-29 Laget: 2014-06-29 Sist oppdatert: 2017-12-05bibliografisk kontrollert
##### Identifikatorer
ORCID-id: orcid.org/0000-0002-8976-8299

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