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786 results on '"Livrea P."'

1. The sub-supersolution method for variable exponent double phase systems with nonlinear boundary conditions

Author

Guarnotta, Umberto, Livrea, Roberto, and Winkert, Patrick

Subjects
Mathematics - Analysis of PDEs
Abstract

In this paper we study quasilinear elliptic systems driven by variable exponent double phase operators involving fully coupled right-hand sides and nonlinear boundary conditions. The aim of our work is to establish an enclosure and existence result for such systems by means of trapping regions formed by pairs of sup- and supersolutions. Under very general assumptions on the data we then apply our result to get infinitely many solutions. Moreover, we also discuss the case when we have homogeneous Dirichlet boundary conditions and present some existence results for this kind of problem. more...

Published
2022

2. Some recent results on singular p-Laplacian equations

Author

Guarnotta, Umberto, Livrea, Roberto, and Marano, Salvatore Angelo

Subjects
Mathematics - Analysis of PDEs, 35-02, 35J62, 35J75, 35J92
Abstract

A short account of some recent existence, multiplicity, and uniqueness results for singular p-Laplacian problems either in bounded domains or in the whole space is performed, with a special attention to the case of convective reactions. An extensive bibliography is also provided. more...

Published
2022

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3. Some recent results on singular p-laplacian systems

Author

Guarnotta, Umberto, Livrea, Roberto, and Marano, Salvatore A.

Subjects
Mathematics - Analysis of PDEs, 35-02, 35J62, 35J75, 35J92
Abstract

Some recent existence, multiplicity, and uniqueness results for singular p-Laplacian systems either in bounded domains or in the whole space are presented, with a special attention to the case of convective reactions. A extensive bibliography is also provided. more...

Published
2022

4. Existence of two solutions for singular {\Phi}-Laplacian problems

Author

Candito, Pasquale, Guarnotta, Umberto, and Livrea, Roberto

Subjects
Mathematics - Analysis of PDEs, 35J20, 35J25, 35J62
Abstract

Existence of two solutions to a parametric singular quasi-linear elliptic problem is proved. The equation is driven by the {\Phi}-Laplacian operator and the reaction term can be non-monotone. The main tools employed are a local minimum theorem and the Mountain Pass theorem, together with the truncation technique. Global C^{1,{\tau}} regularity of solutions is also investigated, chiefly via a priori estimates and perturbation techniques. more...

Published
2022

5. Four solutions for fractional p-Laplacian equations with asymmetric reactions

Author

Livrea, Roberto and Iannizzotto, Antonio

Subjects
Mathematics - Analysis of PDEs, 35A15, 35R11, 58E05
Abstract

We consider a Dirichlet type problem for a nonlinear, nonlocal equation driven by the degenerate fractional p-Laplacian, whose reaction combines a sublinear term depending on a positive parameter and an asymmetric perturbation (superlinear at positive infinity, at most linear at negative infinity). By means of critical point theory and Morse theory, we prove that, for small enough values of the parameter, such problem admits at least four nontrivial solutions: two positive, one negative, and one nodal. As a tool, we prove a Brezis-Oswald type comparison result., Comment: 22 pages more...

Published
2020

6. Singular quasilinear elliptic systems involving gradient terms

Author

Candito, Pasquale, Livrea, Roberto, and Moussaoui, Abdelkrim

Subjects
Mathematics - Analysis of PDEs
Abstract

In this paper we establish existence of smooth positive solutions for a singular quasilinear elliptic system involving gradient terms. The approach combines sub-supersolutions method and Schauder's fixed point theorem. more...

Published
2019

7. Multiple solutions of second order Hamiltonian systems

Author

Bonanno, Gabriele, Livrea, Roberto, and Schechter, Martin

Subjects
second order Hamiltonian systems, periodic solutions, critical points, Pure Mathematics, Applied Mathematics
Abstract

The existence and the multiplicity of periodic solutions for a parameter dependent second order Hamiltonian system are established via linking theorems. A monotonicity trick is adopted in order to prove the existence of an open interval of parameters for which the problem under consideration admits at least two non trivial qualified solutions. more...

Published
2017

22. Post-marketing of disease modifying drugs in multiple sclerosis: An exploratory analysis of gender effect in interferon beta treatment

Author

Trojano, M., Pellegrini, F., Paolicelli, D., Fuiani, A., Zimatore, G.B., Tortorella, C., Simone, I.L., Patti, F., Ghezzi, A., Portaccio, E., Rossi, P., Pozzilli, C., Salemi, G., Lugaresi, A., Bergamaschi, R., Millefiorini, E., Clerico, M., Lus, G., Vianello, M., Avolio, C., Cavalla, P., Iaffaldano, P., Direnzo, V., D'Onghia, M., Lepore, V., Livrea, P., Comi, G., and Amato, M.P. more...

Published
2009
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32. Associations between cardiac arrhythmia, incident disability in activities of daily living and physical performance: The ilsa study

Author

Noale, M., Veronese, N., Smith, L., Ungar, A., Fumagalli, S., Maggi, S., Scafato, E., Farchi, G., Galluzzo, L., Gandin, C., Capurso, A., Panza, F., Solfrizzi, V., Lepore, V., Livrea, P., Motta, L., Car-Nazzo, G., Motta, M., Bentivegna, P., Bonaiuto, S., Cruciani, G., Postacchini, D., Inzitari, D., Amaducci, L., Di Carlo, A., Baldereschi, M., Gandolfo, C., Conti, M., Canal, N., Franceschi, M., Scarlato, G., Candelise, L., Scapini, E., Rengo, F., Abete, P., Cacciatore, F., Enzi, G., Battistin, L., Sergi, G., Crepaldi, G., Minicuci, N., Grigoletto, F., Perissinotto, E., Carbonin, P., Noale, M., Veronese, N., Smith, L., Ungar, A., Fumagalli, S., Maggi, S., Scafato, E., Farchi, G., Galluzzo, L., Gandin, C., Capurso, A., Panza, F., Solfrizzi, V., Lepore, V., Livrea, P., Motta, L., Car-Nazzo, G., Motta, M., Bentivegna, P., Bonaiuto, S., Cruciani, G., Postacchini, D., Inzitari, D., Amaducci, L., Di Carlo, A., Baldereschi, M., Gandolfo, C., Conti, M., Canal, N., Franceschi, M., Scarlato, G., Candelise, L., Scapini, E., Rengo, F., Abete, P., Cacciatore, F., Enzi, G., Battistin, L., Sergi, G., Crepaldi, G., Minicuci, N., Grigoletto, F., Perissinotto, E., and Carbonin, P. more...

Subjects
Disability, Physical activity, Atrial fibrillation, Cardiac arrhythmia, not known, Physical performance
Abstract

Background Cardiac arrhythmias are common conditions in older people. Unfortunately, there is limited literature on associations between cardiac arrhythmias and physical performance or disability. We therefore aimed to prospectively investigate associations between cardiac arrhythmias and changes in disability and physical performance during 8 years of follow-up, using data from the Italian Longitudinal Study on Aging (ILSA). Methods Cardiac arrhythmias diagnosis was posed through a screening phase, confirmed by a physician. The onset of disability in activities of daily living (ADL) and the changes in several physical performance tests during follow-up were considered as outcomes. Fully-adjusted and propensity-score Cox Proportional Hazard models and mixed models were used for exploring associations between cardiac arrhythmia and the outcomes of interest. Results The prevalence of cardiac arrhythmia at baseline was 23.3%. People reporting cardiac arrhythmia at the baseline were significantly older, more frequently male, smokers and reported a higher presence of all medical conditions investigated (hypertension, heart failure, angina, myocardial infarction, diabetes, stroke), but no difference in dementia, Parkinsonism, cognitive or mood disorder. Cardiac arrhythmia at baseline was significantly associated with the incidence of disability in ADL (HR = 1.23; 95%: CI: 1.01-1.50; P = 0.0478 in propensity score analyses; HR = 1.28; 95% CI: 1.01-1.61; P = 0.0401 in fully adjusted models). Cardiac arrhythmia at baseline was also associated with a significant worsening in balance test (P = 0.0436). Conclusions The presence of cardiac arrhythmia at baseline was associated with a significant higher risk of disability and of worsening in some physical performance tests, particularly those relating to balance. Screening and frequently assessing physical performance in older people affected by cardiac arrhythmia can be important to prevent a loss of physical performance, with further, potential, complications of medical management. © 2020 JGC All rights reserved more...

Published
2020

41. Poster presentation

Author

Duparc, F., Noyon, M., Ozeel, J., Gerometta, A., Michot, C., Tadjalli, M., Moslemy, H., Safaei, S., Heiman, A., Wish-Baratz, S., Melnikov, T., Smoliar, E., Hakan, A. Y., Yucel, F., Kachlík, D. K., Pešl, M. P., Báča, V. B., Stingl, J. S., Kachlík, K. D., Čech, Č. P., Báča, B. V., Mompeó, B., Marrero-Rodriguez, A., Zeybek, A., Sağlam, B., Çikler, E., Çetinel, Ş., Ercan, F., Şener, G., Kawawa, Y., Kohda, E., Tatsuya, T., Moroi, M., Kunimasa, T., Nagamoto, M., Terada, H., Labuschagne, B. C. J., van der Krieke, T. J., Hoogland, P. V., Muller, C. J. F., Lyners, R., Vorster, W., Matusz, P., Zaboi, D. E., Xu, S. C., Tu, L. L., Wang, Q., Zhang, M., Han, H., Tao, W., Jiao, Y., Pang, G., Aydin, M. E., Kopuz, C., Demir, M. T., Yildirim, M., Kale, A., Ince, Y., Khamanarong, K., Jeeravipoolvarn, P., Chaijaroonkhanarak, W., Gawgleun, W., Fujino, T., Uz, A., Apaydin, N., Bozkurt, M., Elhan, A., Sheibani, M. T., Adibmoradi, M., Jahovic, N., Alican, I., Erkanli, G., Arbak, S., Karakaş, S., Taşer, F., Güneş, H., Yildiz, Y., Yazici, Y., Aland, R. C., Kippers, V., Song, W. C., Park, S. H., Shin, C., Koh, K. S., Russo, G., Pomara, F., Veca, M., Cacciola, F., Martorana, U., Gravante, G., Tobenas-Dujardin, A. C., Laquerrière, A., Muller, J. M., Fréger, P., López-Serna, N., Álvarez-González, E., Torres-Gonzàlez, V., Laredo-López, G., Esparza-González, G. V., Álvarez-Cantú, R., Garza-González, C. E., Guzmán-López, S., Aldur, M. M., Çelik, H. H., Sürücü, S., Denk, C., Yang, H. J., Gil, Y. C., Kim, T. J., Lee, H. Y., Lee, W. J., Lee, H., Hu, K. S., Akita, K., Kim, H. J., Jung, H. S., Gurbuz, H., Balik, S., Wavreille, G., Chantelot, C., Demondion, X., Fontaine, C., Çavdar, S., Yalin, A., Saka, E., Özdoǧmuş, Ö., Çakmak, Ö., Elevli, L., Saǧlam, B., Coquerel-Beghin, D., Milliez, P. Y., Lemierre, G., Oktem, G., Vatansever, S., Ayla, S., Uysal, A., Aktas, S., Karabulut, B., Bilir, A., Uslu, S., Aktug, H., Yurtseven, M. E., Celik, H. H., Tatar, I., Surucu, S., Karaduman, A., Tunali, S., Neuhüttler, S., Kröll, A., Moriggl, B., Brenner, E., Loukas, M., Arora, S., Louis, Jr, R. G., Fogg, Q. A., Wagner, T., Tedman, R. A., Ching, H. Y., Eze, N., Bottrill, I. D., Blyth, P., Faull, R. L. M., Vuletic, J., Elizondo-Omaña, R. E., Rodríguez, M. A. García, López, S. Guzmán, de la Garza, O. Tijerina, Liu, Y. H., Zhang, K. L., Lu, D. H., Kwak, H. H., Park, H. D., Youn, K. H., Kang, H. J., Kang, H. C., Han, S. H., Ikiz, Z. A. Aktan, Ucerler, H., Uygur, M., Kutoglu, T., Dina, C., Iliescu, D., Şapte, E., Bordei, P., Lekšan, I., Marcikić, M., Radić, R., Nikolić, V., Kurbel, S., Selthofer, R., Báča, V., Doubková, A., Kachlík, D., Stingl, J., Džupa, V., Grill, R., Nam, Y. S., Paik, D. J., Shin, C. S., Kim, S. J., Kim, D. G., Jin, C. S., Kim, D. I., Lee, U. Y., Kwak, D. S., Lee, J. H., Han, C. H., Carpino, A., Rago, V., Romeo, F., Carani, C., Andò, S., Arican, R. Y., Coskun, N., Sarikcioglu, L., Sindel, M., Arican, Y. R., Altun, U., Ozsoy, U., Oguz, N., Yildirim, F. B., Nakajima, K., Duygulu, E., Aydin, H., Gurer, E. Inanc, Ozkan, O., Tuzuner, S., Özsoy, U., Çubukçu, S., Demirel, B. M., Akkin, S. M., Marur, T., Weiglein, A. H., Maghiar, T. T., Borza, C., Bumbu, A., Bumbu, G., Polle, G., Auquit-Auckbur, I., Dujardin, F., Biga, N., Olivier, E., Defives, T., Ghazali, S., Anastasi, G., Rizzo, G., Favaloro, A., Miliardi, D., Giacobbe, O., Santoro, G., Trimarchi, F., Cutroneo, G., Govsa, F., Bilge, O., Ozer, M. A., Erdogmus, S., Grizzi, F., Pelillo, F., Mori, M., Franceschini, B., Portinaro, N., Godlewski, G., Viala, M., Rouanet, J. P., Prat, D., Rahmé, Z. S., Prudhomme, M., Eken, E., Kwiatkowska, M., Liegmann, J., Chmielewski, R., Grimmond, J., Kwiatkowski, M., Schintler, M. V., Windisch, G., Wittgruber, G., Prandl, E. C., Prodinger, P., Anderhuber, F., Scharnagl, E., Gerbino, A., Buscemi, M., Leone, A., Mandracchia, R., Peri, G., Lipari, D., Farina-Lipari, E., Valentino, B., D’Arpa, S., Cordova, A., Bucchieri, F., Ribbene, A., David, S., Palma, A., Davies, D. E., Haitchi, H. M., Holgate, S. T., La Rocca, G., Anzalone, R., Campanella, C., Rappa, F., Bartolotta, T., Cappello, F., Bellafiore, M., Sivverini, G., Palumbo, D., Macaluso, F., Farina, F., Di Felice, V., Montalbano, A., Ardizzone, N., Marcianò, V., Zummo, G., Tanyeli, E., Üzel, M., Carini, F., Scardina, G. A., Varia, P., Valenza, V., Messina, P., Meiring, J. H., Schumann, C., Whitmore, I., Greyling, L. M., Hamel, O., Hamel, A., Robert, R., Garçon, M., Lagier, S., Blin, Y., Armstrong, O., Rogez, J. M., Le Borgne, J., Ifrim, C. Feng, Maghiar, A., Botea, M., Ifrim, M., Pop, O., Sandor, M., Behdadipour, Z., Saberi, M., Esfandiary, E., Gentile, C., Marconi, A., Livrea, M. A., Uzan, G., D’Alessio, P., Ridola, C. G., Grassi, N., Pantuso, G., Bottino, A., Cacace, E., Li Petri, S., Di Gaudio, F., Guercio, G., Latteri, M. A., Nobile, D., Cipolla, C., Caruso, G., Salvaggio, G., Lo Cascio, A., Fatta, G., Lagalla, R., Campisi, A., Verderame, F., Martegani, A., Cardinale, A. E., and Luedinghausen, M. V. more...

Published
2005
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