► A. Dehghan Nezhad, "Tangency of fuzzy topological ", The 10th Seminar on Math. Analysis and Application, Department of Mathematics, Vali-e-Asr University, Rafsenjan, February 9&10 (2000). 
► A. Dehghan Nezhad, " The Seventeen type of two-dimensional periodic patterns in Islamic-Persian Art ",International conference of mathematics for All, Kordestan University, Kordestan, Iran, 10 & 11 July (2000) (Persian).  
► B. Davvaz, A. Dehghan Nezhad, "Chemical examples in hypergroups", The 31th Iranian Mathematics Conference, University of Tehran, Iran, 27-30 August (2000). 
► A. Dehghan Nezhad, "A relationship between classical tessellation and three manifolds", First Seminar on Geometry and Topology, 14 & 15 January 2001, Tabriz, Iran. 
► A. Dehghan Nezhad, "Research in mathematical methods of the existing geometrical designs and applications in Islamic-Iranian art tiling", Second Congress of History of Iranian Architecture and Urbanism, Bam citadel, Kerman, Iran, April 14-18 (1999), (Persian).
► A. Dehghan Nezhad, "Fuzzy Sg-compact set in fuzzy topological spaces", The 11th Seminar on Math. Analysis and Application, Iran, Yazd University, Yazd, February 3 & 4, 5 (2001).
► A. Dehghan Nezhad, " The concept to three-manifolds in graph theory ", The International Conference in Graph Theory, The University of Auckland, New Zealand, 10- 16 Dec (2000). 
► Participation in l'Ecole C.I.M.P.A. de Marrakech, (Maroc), " Géométrie et Topologie Différentielle; Géométrie Algorithmique ", 17-29 Mai (2004). 
► A. Dehghan Nezhad, "Hypergroupe et applications ", Conference in Lamav, The University of Valenciennes, France, 21 June (2006). 
► Akbar Dehghan Nezhad, "An introduction on cohomological equation and Cohomology-free ", The 38th Annual Iranian Mathematics conference, 3-6 September 2007, University of Zanjan, Iran, 308-310. 
►  Akbar Dehghan Nezhad, " On the cohomological equations for some solvmanifolds", Extended Abstracts of 39th Annual Iranian Mathematics Conference 24-27 August 2008, Shahid Bahonar University of Kerman, Kerman, I.R.Iran. 
►  Akbar Dehghan Nezhad, "The leafwise Dolbeault cohomology on some solvmanifolds ", Eight seminar of differential equations dynamical systems and their applications , Isfahan University of technology, Isfahan, Iran, July 19-21, 2008, (124-127). 
►  A. Dehghan Nezhad, " The 17 wallpaper groups ", The 10th Iranian Mathematics Education Conference, Yazd, Iran, Aug. 2008.
► Akbar Dehghan Nezhad and Arefeh Torki Bioki, "A Generalization of the Zig-Zag Lemma", The 22th Iranian Algebra Seminar, 31-2Jan-Feb 2012, University of Sabzevar, Iran.
► Akbar Dehghan Nezhad, "Some Recent Results and Questions Concerning The
Cohomological equations", The Seventh seminar on Geometry and Topology 29-30 January 2014, Iran University of Science and Technology, Tehran, I.R.Iran, Invited Speaker (30 minutes talk).
► Akbar Dehghan Nezhad and Saman Shahriyari, “Some results on $Phi $-reflexive property”, The 46th Annual Iranian Mathematics Conference (AIMC 46), August 25-28, 2015 in Yazd, Iran.
► Akbar Dehghan Nezhad and Saman Shahriyari, “ Riemannian Pseudomonoids”,  The 9th  Seminar on Geometry and Topology‎, ‎26-27 July‎, ‎2017 in University of Maragheh, Maragheh, Iran 
► Akbar Dehghan Nezhad and Shiva Fatehi borujeni, “Diffeological Generalized Group”,  The 9th Seminar on Geometry and Topology‎, ‎26-27 July‎, ‎2017 in University of Maragheh, Maragheh, Iran.
► Akbar Dehghan Nezhad and Saman Shahriyari, “Homotopy Theory of Pseudomonoids”, The 48th Annual Iranian Mathematics Conference (AIMC 48), August 22-25, 2017 in Bu-Ali Sina University, Hamedan Iran.
► Akbar Dehghan Nezhad and Mohamadali Rastegar, “The Role of Differential Geometry to some Aerospace optimization(time) Problems", 26th Annual International Conference of the Iranian Society of Mechanical Engineers,
April 24-26 2018.
► Akbar Dehghan Nezhad and Alireza Ahmadi, “Cohomology theories and sheaves on diffeological spaces”, The 49th Annual Iranian Mathematics Conference (AIMC 49), August 23-26, 2018 , in Iran University of Science and Technology, Tehran, I.R. Iran. 
► Akbar Dehghan Nezhad and Sareh Bizavi, “An approach to $S$-(co)homological theory‎”, The 49th Annual Iranian Mathematics Conference (AIMC 49), August 23-26, 2018 , in Iran University of Science and Technology, Tehran, I.R. Iran. 
► A. Dehghan Nezhad, "A relationship between classical tessellation and three manifolds", Proceeding, First Seminar on Geometry and Topology, 14 & 15 January 2001, Tabriz, Iran.  
► M. Bozorg , Sher ali Hanif  D., Davison E. J., Ali Delavar-Khalafi and A. Dehghan Nezhad, "Parameter stability margins for polynomial uncertainty structures, : a Polynomial Programming Approach", 2005 IFAC Word Congress, Prague, July 2005, Topic 2.5, Paper code MOAO1-TP:10.
► A. Dehghan Nezhad, "Color Tiling in Islamic-Persian Pattern", Proceeding of 12th Algebra Seminar, Department of Mathematics. Shaid Beheshti University, Tehran, Iran, March 28-29 (2000).
► A. Dehghan Nezhad, "Fuzzy Sg-compact set in fuzzy topological spaces", Proceeding of the 11th Seminar on Math. Analysis and Application, Iran, Yazd University, Yazd, February 3 & 4, 5 (2001).
 

►  اکبر دهقان نژاد و سعیده حمایت  " مباحثی درهندسه‌ی الگوهای پراش اشعه  X  از شبه‌بلورها " دومین همایش ملی پژوهشی¬های کاربردی در علوم ریاضی و فیزیک، دوم بهمن 1393 دانشگاه تهران.