1. Tunç, Cemil, and Sizar Abid Mohammed. "On the qualitative properties of differential equations of third order with retarded argument." Proyecciones (Antofagasta) 33, no. 3 (2014): 325-347.
2. ABED MOHAMMED, S. I. Z. A. R. "COMPARING SOME ROBUST METHODS WITH OLS METHOD IN MULTIPLE REGRESSION WITH APPLICATION." Journal of Concrete & Applicable Mathematics 11, no. 1 (2013).
3. Othman, Sameera A., Sizar A. Mohammed, and Shelan S. Ismaeel. "ON forecasting by Dynamic Regression models." J. of university of anbar for pure science (2013).
4. Tunç, Cemil, and Sizar Abid Mohammed. "New results on exponential stability of nonlinear Volterra integro-differential equations with constant time-lag." Proyecciones(An tofagasta) 36, no. 4 (2017): 615-639.
5. Tunc, Cemil, and Sizar Abid Mohammed. "On the stability and instability of functional Volterra integrodifferential equations of first order." Bull. Math. Anal. Appl 9, no. 1 (2017): 151-160.
6. Tunç, Cemil, and Sizar Abid Mohammed. "A remark on the stability and boundednesscriteria in retarded Volterra integro-differential equations." Journal of the Egyptian Mathematical Society 25, no. 4 (2017): 363-368.
7. Tunç, Cemil, and Sizar Abid Mohammed. "On the stability and uniform stability of retarded integro-differential equations." Alexandria engineering journal 57, no. 4 (2018): 3501-3507.
8. Burnside, Neil, N. van Rensberg, Heriel Moshi, Kamal Ketuly, S. Mohammad, Nematollah Azizi, and F. Argamosa. "Impact of University engagement on environmental resilience of urban spaces in Asia and Africa." SUEUAA, Glasgow (2018).
9. Argamosa, Felipe Ronald, Nematollah Azizi, Neil Burnside, Muir Houston, Nickey role of gender mainstreaming in city-level interventions and leadership: Examples from Manila, Duhok, and Sanandaj. SUEUAA Strengthening Urban Engagement of Universities in Africa and Asia, (2019).
10. Argamosa, Felipe Ronald, Nematollah Azizi, Neil Burnside, Muir Houston, Nickey Janse van Rensberg, Kamal Aziz Ketuly, Sizar Abid Mohammed, Heriel Moshi, and Charles Nherera. "Impact of University engagement on environmental resilience of urban spaces in Asia and Africa. SUEUAA Thematic Paper Series, TPS 103/19." (2019).
11. Tunç, Cemil, and Sizar Abid Mohammed. "Uniformly boundedness in nonlinear matollah Azizi, and Mpoki Mwaikokesya. Anchoring universities into (un) expected realities: the engagement role of universities in Asia and Africa. SUEUAA, (2018).
12. Tunç, Cemil, and Sizar Abid Mohammed. "Uniformly boundedness in nonlinear Volterra integro-differential equations with delay." J Appl Nonlinear Dyn 8, no. 2 (2019): 279-290.
13. Tunç, Cemil, and Sizar Abid Mohammed. "On the asymptotic analysis of bounded solutions to nonlinear differential equations of second order." Advances in Difference Equations 2019, no. 1 (2019): 1-19.
14. Gao, Wei, Hajar F. Ismael, Sizar A. Mohammed, Haci Mehmet Baskonus, and Hasan Bulut. "Complex and real optical soliton properties of the paraxial non-linear Schrödinger quation in Kerr media with M-fractional." Frontiers in Physics 7 (2019): 197.
15. Mohammed, Sizar Abid, and Cemil Tunc. "Qualitative Analysis of Nonlinear Retarded Differential Equations of Second Order." Dynamic Systems and Applications 29, no. 1 (2020): 53-70.
16. Manafian, Jalil, Onur Alp Ilhan, and Sizar Abid Mohammed. "Forming localized waves of the nonlinearity of the DNA dynamics arising in oscillator-chain of Peyrard-Bishop model." AIMS Math. 5, no. 3 (2020): 2461-2483.
17. Ilhan, Onur Alp, Jalil Manafian, As’ad Alizadeh, and Sizar Abid Mohammed. "Mlump and interaction between M lump and N stripe for the third-order evolution equation arising in the shallow water." Advances in Difference Equations 2020, no. 1 (2020): 1-20.
18. Manafian, Jalil, Onur Alp Ilhan, As’ad Alizadeh, and Sizar Abid Mohammed. "Multiple rogue wave and solitary solutions for the generalized BK equation via Hirota bilinear and SIVP schemes arising in fluid mechanics." Communications in Theoretical Physics 72, no. 7 (2020): 075002.
19. Wan, Pengbo, Jalil Manafian, Hajar Farhan Ismael, and Sizar Abid Mohammed. "Investigating one-, two-, and triple-wave solutions via multiple exp-function method arising in engineering sciences." Advances in Mathematical Physics 2020 (2020).
20. Manafian, Jalil, Sizar Abid Mohammed, As’ad Alizadeh, Haci Mehmet Baskonus, k wave solutions and semi-inverse variational method for (3+ 1)-dimensional potential-YTSF equation." East Asian Journal on Applied Mathematics 10, no. 3 (2020): 549-565.
21. Saadat Mazanova. "Periodic wave solutions and stability analysis for the (3+ 1)-D ei Gao. "Investigating lump and its interaction for the third-order evolutionequation arising propagation of long waves over shallow water." European Journal of Mechanics-B/Fluids 84 (2020): 289-301.
22. Manafian, Jalil, Onur Alp Ilhan, Hajar Farhan Ismael, Sizar Abid Mohammed, and Saadat Mazanova. "Periodic wave solutions and stability analysis for the (3+ 1)-D potential-YTSF equation arising in fluid mechanics." International Journal of Computer Mathematics 98, no. 8 (2021): 1594-1616.
23. Tunç, C., and S. A. Mohammed. "On the Asymptotic Stability, Uniform Stability, and Boundedness of Solutions to Nonlinear Volterra Integrodifferential Equations." Ukrainian Mathematical Journal (2021): 1-14.
24. Zhao, Jin, Jalil Manafian, Neven E. Zaya, and Sizar Abid Mohammed. "Multiple rogue wave, lump‐periodic, lump‐soliton, and interaction between k‐lump and k‐stripe soliton solutions for the generalized KP equation." Mathematical Methods in the Applied Sciences 44, no. 6 (2021): 5079-5098.
25. Ren, Jianguo, Jalil Manafian, Muhannad A. Shallal, Hawraz N. Jabbar, and Sizar A. Mohammed. "Quintic B-spline collocation method for the numerical solution of the Bona–Smith family of Boussinesq equation type." International Journal of Nonlinear Sciences and Numerical Simulation (2021).
26. Nisar, Kottakkaran Sooppy, Onur Alp Ilhan, Sadiq Taha Abdulazeez, Jalil Manafian, Sizar Abid Mohammed, and M. S. Osman. "Novel multiple soliton solutions for some nonlinear PDEs via multiple Exp-function method." Results in Physics 21 (2021): 103769.
27. 27. Tunç, C., and S. A. Mohammed. "On asymptotically stability, uniformly stability and boundedness of solutions of nonlinear Volterra integro-differential equations." Ukrains’ kyi Matematychnyi Zhurnal 72, no. 12 (2020): 1708-1720.
28. Mohammed, Sizar Abid. "Existence, boundedness and integrability of global solutions to delay integro-differential equations of second order." Journal of Taibah University for Science 14, no. 1 (2020): 235-243.
29. Manafian, Jalil, Sizar Abid Mohammed, As’ad Alizadeh, Haci Mehmet Baskonus, and Wei Gao. "Investigating lump and its interaction for the third-order evolution equation arising propagation of long waves over shallow water." European Journal of Mechanics-B/Fluids 84 (2020): 289-301.

My research interests center on the mathematical analysis and application of nonlinear dynamical systems. I work primarily with nonlinear differential equations, including delay and retarded systems, and focus on understanding their stability, boundedness, and asymptotic behavior. These properties are essential for predicting long-term dynamics in engineering, biological, and physical models.

I also study integral and integro-differential equations, especially of Volterra and Fredholm type, which naturally capture memory and hereditary effects. My work includes both theoretical analysis and the development of efficient numerical and analytical methods, such as spline approximations, collocation techniques, iterative schemes, and approaches like the Exp-function and Hirota methods.

A further area of interest is soliton theory and nonlinear wave dynamics, where I investigate traveling-wave solutions and nonlinear PDEs that arise in physics and engineering. Alongside this theoretical work, I am engaged in mathematical modeling of physical, biological, and fluid-mechanical systems, combining deterministic models with applied statistical methods, including regression and forecasting.

My research extends to environmental and community-focused applications, where I contribute to projects involving water quality monitoring, phytoremediation, public health studies, and environmental resilience. I value interdisciplinary work that connects university expertise with community needs, supporting sustainable development through quantitative analysis and modeling.

My academic teaching career reflects more than a decade of continuous engagement with students across diverse disciplines and academic levels at the University of Duhok. Between 2011 and 2016, I contributed to the education of undergraduate students in the College of Veterinary Medicine, the College of Agriculture, and the College of Basic Education. During this period, I delivered courses in Computer Applications, Microsoft Office, SPSS statistical analysis, and fundamental internet skills. These courses provided students with essential digital competencies, which supported their academic development and prepared them for research activities and professional practice.

Since 2017, my teaching responsibilities have expanded to include postgraduate instruction. I have taught Applied Mathematics and Advanced Statistics to master’s students, ensuring that they develop rigorous analytical skills and a deep understanding of mathematical modeling. Additionally, I have taught courses in Operations Research and Computer Applications, helping students connect theoretical concepts with practical problem-solving methodologies used in scientific and administrative fields.

Throughout my teaching career, I have remained committed to fostering an engaging, supportive learning environment. My approach emphasizes clarity of explanation, practical application, and the development of independent analytical thinking. This sustained experience across multiple colleges and academic levels has strengthened my dedication to advancing mathematical education and supporting students as they progress in their academic and professional journeys.

My supervision experience reflects a continuous and evolving engagement in higher education within the Mathematics Department at the College of Basic Education. Since earning my bachelor’s degree in 2011 and continuing to the present, I have been deeply involved in academic environments that emphasize both teaching and the gradual development of professional expertise. This long period has allowed me to cultivate a strong foundation in mathematical knowledge, pedagogical methods, and student support strategies.

Beginning my master's degree in 2020 marked an important transition in my academic journey. Throughout my postgraduate studies, I have taken on supervision responsibilities that align with the department’s goal of fostering analytical thinking and research skills among students. My role includes guiding students in understanding mathematical concepts, refining their problem-solving techniques, and supporting them in the completion of course projects or practical assignments.

This extended supervision experience has allowed me to strengthen my communication skills, enhance my ability to convey complex ideas clearly, and create a supportive learning environment. Furthermore, it has helped me contribute meaningfully to the academic growth of students while simultaneously advancing my own understanding of mathematics as a discipline. Through both my bachelor’s and master’s level engagement, I have developed a professional identity rooted in mentorship, academic responsibility, and a commitment to continuous learning.

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