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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
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Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, M. Stanislavova, A. Stefanov, On the stability of periodic waves for the Benney system, SIAM Journal on Applied Dynamical Systems, 21(3)(2022), 1726-1747 (Web of Science, SCOPUS) |
05.07.2022 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
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Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, A. Ramadan, A. Stefanov, On the stability of the compacton waves for the degenerate KdV and NLS models, Quarterly of Applied Mathematics, 80(3)(2022), 507-528 (Web of Science, SCOPUS) (Q3)
|
05.07.2022 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
 ðåôåðèðàíè èçäàíèÿ
| Ñòàòèè
| S. Hakkaev, “Instability of solitary wave solutions of a class of nonlinear dispersive systems”, Annuaire de L’universite de Sofia, T 96 (2004), 105-115 |
05.07.2022 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, F. Hunutlu, Linear stability of periodic standing waves of the KGZ system, Turkish Journal of Mathematics, 45(6)(2021), 2594 – 2602 (Web of Science, SCOPUS) (Q3) |
01.12.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
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Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, A. Stefanov, Stability of periodic traveling waves for the fractional KdV and NLS equations, Proceedings of the Royal Society of Edinburgh : Section A Mathematics, 151(4)(2021), 1171-1203 (Web of Science, SCOPUS) (Q2) |
24.11.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
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Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, M. Stanislavova, A. Stefanov, On the stability of periodic waves for the cubic derivative NLS and the quintic NLS, Journal of Nonlinear Science, 31(2021), number 54, 38 pages (Web of Science, SCOPUS) (Q1) |
28.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, Orbital Stability and Instability of Solitary Waves for a Class of Dispersive Symmetric Regularized Long-Wave Equation, Mediterranean Journal of Mathematics 16 (4)(2019), 92 (Web of Science, SCOPUS)(Q1) |
12.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
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Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, Stability of semitrivial periodic waves of a Schrodinger system , Journal of Mathematical Physics 60 (8)(2019), 081502 (Web of Science, SCOPUS) (Q2) |
12.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
 ãîäèøíèê
| Ñòàòèè
| S. Hakkaev, T. Syuleymanov, “Spectral stability of the cnoidal waves of the Schrodinger system”, Annual of Konstantin Preslavsky University of Shumen, Vol. XXI C, (2020), 11-22 |
09.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, K. Kirchev , “Local well-posedness and orbital stability of solitary wave solutions for the generalized Camassa-Holm equation”, Communications in Partial Differential Equations, 30(2005), 761-781 (Web of Science, SCOPUS) (Q1) |
08.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, “Stability of peakons for an integrable shallow water equation”, Physics Letters A, 354(2006), 137-144 (Web of Science, SCOPUS) (Q2) |
08.04.2021 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, “Orbital stability of solitary waves of the Schrodinger-Boussinesq equation”, Commun. Pure Applied Analysis, 6(4) (2007), 1043-1050 (Web of Science, SCOPUS) (Q2) |
08.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, K. Kirchev , “Stability of solitary wave solutions of nonlinear dispersive system in a critical case”, Nonlinear Analysis TMA, 57(2007), 2890-2899 (Web of Science, SCOPUS) (Q1) |
08.04.2021 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, I. Iliev, K. Kirchev, “Stability of periodic traveling shallow water waves determined by Newton’s equation”, Journal of Physics A: Mathematical and Theoretical,41(2008), no.8, 085203, 31p.(an article chosen for IOP Select) (Web of Science, SCOPUS) (Q1) |
08.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| O. Christov, S. Hakkaev, “On the Cauchy problem for the periodic b-family of equations and of the non-uniform continuity of Degasperis-Procesi equation” , Journal of Mathematical Analysis and Applications, 360(2009), 47-56 (Web of Science, SCOPUS) (Q2) |
08.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| O. Christov, S. Hakkaev, “ On the inverse scattering approach and action-angle variables for the Dullin-Gottwald-Holm equation” Physica D, 238(2009), 9-19 (Web of Science, SCOPUS) (Q1) |
08.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| J. Jiang, S. Hakkaev, “Wave breaking and propagation speed for a class of one-dimensional shallow water equations”, Abstract and Applied Analysis, ID 647468 (2011), 15 pp. (Web of Science, SCOPUS) |
08.04.2021 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| J. Angulo, S. Hakkaev, “Ill-posedness for periodic nonlinear dispersive equations” , Electronic J. Differential Equations, 119(2010), 1-19 (Web of Science, SCOPUS) (Q3) |
08.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev. M. Stanislavova, A. Stefanov, “Transverse instability for periodic traveling waves of KP-I and Schrodinger equations” , Indiana University Mathematics Journal, 61(2)(2012), 461-492 (Web of Science, SCOPUS) (Q2) |
08.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, I. Iliev, K. Kirchev, “Stability of periodic traveling waves for the complex modified Korteweg-de Vries Equation”, J. Differential Equations, 248(10)(2010),2608-2627 (Web of Science, SCOPUS) (Q1) |
08.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
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Ñ èìïàêò ôàêòîð
| Ñòàòèè
| J. Angulo, A. Corcho, S. Hakkaev, “Well-posedness and stability in the periodic case for the Benney system”, Adv. Diff. Eqs., 16(2011), 523-550 (Web of Science, SCOPUS) (Q1) |
08.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| O. Christov, S. Hakkaev, I. Iliev, “Non-uniform continuity of periodic Hom-Staley b-family of equations”, Nonlinear Analysis, 75 (2012), 4821-4838 (Web of Science, SCOPUS) (Q1) |
08.04.2021 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
 ðåôåðèðàíè èçäàíèÿ
| Ñòàòèè
| S. Hakkaev, “Nonlinear stability of periodic traveling waves of the BBM system”, Communications in Mathematical Analysis, 15(2)(2013), 39-51 ( SCOPUS) |
08.04.2021 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, M. Stanislavova, A. Stefanov, “Spectral stability for subsonic traveling pulses of the Boussinesq ‘abc’ system, SIAM Journal on Applied Dynamical Systems, 12(2)(2013), 878-898 (Web of Science, SCOPUS) (Q1) |
08.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, I. Iliev, K. Kirchev “Stability of periodic traveling waves for the quadratic and cubic nonlinear Schrodinger equations” , International Journal of Bifurcation and Chaos, 23(5)(2013), 1350090 (20pp.), DOI:10.1142/S0218127413500909 (Web of Science, SCOPUS) (Q2) |
08.04.2021 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, M. Stanislavova, A. Stefanov, “Orbital stability for periodic standing waves for the Klein-Gordon-Zakharov system and the beam equation”, Zeitschrift fuer Angewandte Mathematik und Physik, 64(2) (2013), 265-282 (Web of Science, SCOPUS) (Q1) |
08.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, M. Stanislavova, A. Stefanov, “Linear stability analysis for periodic traveling waves of the Boussinesq equation and the KGZ system”, Proceedings of the Royal Society of Edinburgh : Section A Mathematics, 144(03) (2014), 455-489 (Web of Science, SCOPUS) (Q1) |
08.04.2021 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
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Ñ èìïàêò ôàêòîð
| Ñòàòèè
| V. Hasanov, S. Hakkaev, Newtons method for a nonlinear matrix equation, Compt. rend. Acad. bulg. Sci., 68 (8), (2015), pp. 973-982
(Web of Science, SCOPUS) |
08.04.2021 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
 íàó÷íî ñïèñàíèå
| Ñòàòèè
| S. Hakkaev, Linear stability analysis for periodic standing waves of the Klein-Gordon equation, Differential Equations and Dynamical Systems, 22(2) (2014), 209-219 ( SCOPUS) |
08.04.2021 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| A. Demirkaya, S. Hakkaev, M. Stanislavova, A. Stefanov, On the spectral stability of periodic waves of the Klein-Gordon equation, Differential and Integral Equations, 28(5&6)(2015), 431-454 (Web of Science, SCOPUS) (Q2) |
08.04.2021 |
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Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| A. Demirkaya, S. Hakkaev, On the spectral stability of periodic waves for the coupled Schrodinger equations, Physics Letters A, 379 (2015), 2908-2914 (Web of Science, SCOPUS) (Q2) |
08.04.2021 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, M. Stanislavova, A. Stefanov, Periodic traveling waves of the regularized short pulse and Ostrovsky equations:existence and stability, SIAM Journal on Mathematical Analysis, 49(1)(2017), 674-697(Web of Science, SCOPUS) (Q1) |
08.04.2021 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, M. Stanislavova, A. Stefanov, Spectral stability for classical periodic waves of the Ostrovsky and short pulse models, Studies in Applied Mathematics, 139(3)(2017), 405-433 (Web of Science, SCOPUS) (Q1) |
08.04.2021 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S Hakkaev, M Stanislavova, AG Stefanov, On the Generation of Stable Kerr Frequency Combs in the Lugiato--Lefever Model of Periodic Optical Waveguides, SIAM Journal on Applied Mathematics 79 (2)(2019), 477-505 (Web of Science SCOPUS) (Q2) |
08.04.2021 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
 ðåôåðèðàíè èçäàíèÿ
| Ñòàòèè
| S. Hakkaev, “Stability and instability of solitary wave solutions of a nonlinear dispersive system of Benjamin-Bona-Mahony type”, Serdica Math.J. 29(2003), 337-354 |
31.10.2015 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, K. Kirchev ,“Positivity properties and stability of solitary waves of Benjamin-Bona-Mahony type”, Compt. rend. Acad. bulg. Sci., 2001, T.55, No 7, 5-10 |
31.10.2015 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, K. Kirchev, “Stability and instability of traveling waves solutions of complex Benjamin-Bona-Mahony type”, Compt. rend. Acad. bulg. Sci.,2001, T.55,No 6, 17-22 |
31.10.2015 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
 ðåôåðèðàíè èçäàíèÿ
| Ñòàòèè
| S. Hakkaev, Zh.Zhelev, R.Nickolov “Subscalarity of a class of operators”, Mathematica Balcanika, 17 (2003), 231-238 |
31.10.2015 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
 ðåôåðèðàíè èçäàíèÿ
| Ñòàòèè
| S. Hakkaev, “Scattering of small solutions of symmetric regularized-long-wave equation”, Applications Math. (Warsaw) 31(2004), 313-320 |
31.10.2015 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
 ðåôåðèðàíè èçäàíèÿ
| Ñòàòèè
| S. Hakkaev, K. Kirchev , “On the well-posedness and stability of peakons for a generalized Camassa-Holm equation” , International Journal of Nonlinear Science, 3(2006),139-148 |
31.10.2015 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
Ñ èìïàêò ôàêòîð
| Ñòàòèè
| S. Hakkaev, “On the stability of periodic waves of the nonlinear wave system”, Compt. rend. Acad. bulg. Sci., 68(3)(2015), 305-312 |
31.10.2015 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
 ñáîðíèê
| Äîêëàäè
| “Decay and nonlinear scattering of solutions for a dispersive system” (witn V. Milanov, R. Nickolov, Zh. Zhelev), Proceedings of the Second ACRMS Conference 2005, 16-22 |
31.05.2013 |
|
Ïðîô. ä.ì.í. . Ñåâäæàí Àõìåäîâ Õàêêúåâ
|
 ñáîðíèê
| Äîêëàäè
| S. Hakkaev, “Existence of solitary waves for fifth-order generalized Camassa-Holm equation via Concentration Compactness”, Jubilee International Conference 60 yearsInstitute of Mathematics and Informatics Bulgarian Academy of Sciences, 2007 |
31.05.2013 |
