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Hire Dr. Theodoros L.

Cyprus

USD 90 /hr

Computational Physicist & Scientific Machine Learning Consultant | Simulation, Inverse Problems, Model Evaluation

Profile Summary

I am a computational physicist with long experience in scientific computing, simulation-driven research, and data analysis across both fundamental physics and applied science problems. My work combines high-performance computing, Monte Carlo methods, inverse problems, and scientific machine learning methods. In recent years, I have focused on the development of stochastic reconstruction algorithms, evaluation metrics, and benchmarking frameworks for medical imaging, as well as on machine-learning-based pattern recognition using large real-world datasets from ionospheric monitoring systems. My work involves both simulation pipelines and the processing, analysis, and validation of experimental data. I can help with tasks such as: Development and review of scientific algorithms and simulation codes, Data analysis, model validation, and performance benchmarking, Inverse problems and reconstruction methods, Scientific machine learning model development and evaluation, Review and assessment of technical methods, results, and workflows I am used to working with complex technical material and translating it into reliable, well-tested computational pipelines and analyses. I am comfortable contributing either to short, well-defined tasks or to longer-term technical projects.

Subject Matter Expertise

• ☆ Data Analysis
• ☆ Data Processing
• ☆ Neural Networks
• ☆ Python
• ☆ Medical Imaging/Radiology
• ☆ Computed Tomography (CT)

Services

• Writing
• Research
• Consulting
• Data & AI

Writing Technical Writing

Research Meta-Research, Feasibility Study, Technology Scouting, Gap Analysis, Scientific and Technical Research, Systematic Literature Review, Secondary Data Collection

Consulting Scientific and Technical Consulting

Data & AI Predictive Modeling, Statistical Analysis, Image Analysis, Algorithm Design-Non ML, Algorithm Design-ML, Data Visualization, Big Data Analytics, Data Cleaning, Data Processing

Work Experience

Associate Professor

Frederick University

- Present

Special Teachibg Staff / Researcher

Cyprus Unversity of Technology

January 2007 - August 2010

Postdoctoral Researcher

Cyprus University

September 2005 - September 2007

Education

PhD (Physics)

University of Manchester

2000 - 2004

BSc (Physics)

University of Manchester

1997 - 2000

Certifications

• Certification details not provided.

Publications

JOURNAL ARTICLE

Theodoros Leontiou, Stelios Avraam, Demetris Photiou, Loucas Papadakis (2025). Effect of MEX Process Parameters on the Mechanical Response of PLA Structures for Orthopedic Applications . Journal of Manufacturing and Materials Processing.

Theodoros Leontiou, Stelios Avraam, Demetris Photiou, Loucas Papadakis (2025). Effect of MEX Process Parameters on the Mechanical Response of PLA Structures for Orthopedic Applications . Journal of Manufacturing and Materials Processing.

Theodoros Leontiou, Elena Ttofi, Costas Kyriacou, Yiannis Parpottas (2025). A Method for Calculating Small Sizes of Volumes in Postsurgical Thyroid SPECT/CT Imaging . Life.

Theodoros Leontiou, Elena Ttofi, Costas Kyriacou, Yiannis Parpottas (2025). A Method for Calculating Small Sizes of Volumes in Postsurgical Thyroid SPECT/CT Imaging . Life.

Anna Frixou, Marios Charalambides, Efstathios Stiliaris, Costas N. Papanicolas, Sofia Nikolaidou, Antonis Papadakis, Theodoros Leontiou (2024). Three-Dimensional Thermal Tomography with Physics-Informed Neural Networks . Tomography.

Theodoros Leontiou, Anna Frixou, Marios Charalambides, Efstathios Stiliaris, Costas N. Papanicolas, Sofia Nikolaidou, Antonis Papadakis (2024). Three-Dimensional Thermal Tomography with Physics-Informed Neural Networks . Tomography.

Theodoros Leontiou, Constantia Alexandrou, Jacob Finkenrath, Stefan Meinel, Martin Pflaumer, Marc Wagner (2024). b¯b¯ud and b¯b¯us tetraquarks from lattice QCD using symmetric correlation matrices with both local and scattering interpolating operators . Physical Review D.

Theodoros Leontiou, Constantia Alexandrou, Jacob Finkenrath, Stefan Meinel, Martin Pflaumer, Marc Wagner (2024). Shallow Bound States and Hints for Broad Resonances with Quark Content b¯c¯ud in B−D¯ and B*−D¯ Scattering from Lattice QCD . Physical Review Letters.

Theodoros Leontiou, Constantia Alexandrou, Simone Bacchio, Giannis Koutsou, Srijit Paul, Marcus Petschlies, Ferenc Pittler (2024). Elastic nucleon-pion scattering amplitudes in the Δ channel at physical pion mass from lattice QCD . Physical Review D.

Intermediate descending layer and sporadic E tidelike variability observed over three mid-latitude ionospheric stations <head> <META HTTP-EQUIV="Refresh" CONTENT="0;URL=/servlet/useragent"> </head> . Advances in Space Research.

Theodoros Leontiou, Haris Haralambous, Vasilis Petrou, Arun Kumar Singh, Marios Charalambides, Nikos Lithoxopoulos, Agis Agisilaou(2021). Adjusting CCIR Maps to Improve Local Behaviour of Ionospheric Models . Atmosphere. 12. (6). p. 691. {MDPI} {AG}

Theodoros Leontiou, Haris Haralambous, Vasilis Petrou, Arun Kumar Singh, Marios Charalambides, Nikos Lithoxopoulos, Agis Agisilaou (2021). Adjusting CCIR Maps to Improve Local Behaviour of Ionospheric Models . Atmosphere.

Theodoros Leontiou, Constantia Alexandrou, Joshua Berlin, Jacob Finkenrath, Marc Wagner (2020). Tetraquark interpolating fields in a lattice QCD investigation of the Ds0*(2317) meson . Physical Review D.

Alexandrou, C., Berlin, J., Dalla Brida, M., Finkenrath, J., Leontiou, T., Wagner, M.(2018). Lattice QCD investigation of the structure of the a 0 (980) meson . Physical Review D. 97. (3).

Theodoros Leontiou, Marios M. Fyrillas, Konstantinos V. Kostas (2017). Optimum interfaces that maximize the heat transfer rate between two conforming conductive media . International Journal of Thermal Sciences.

Fyrillas, M.M., Leontiou, T., Kostas, K.V.(2017). Optimum interfaces that maximize the heat transfer rate between two conforming conductive media . International Journal of Thermal Sciences. 121. p. 381-389.

Leontiou, T., Kelires, P.C.(2016). Composition and stress of SiGe nanostructures on curved substrates . Physical Review B - Condensed Matter and Materials Physics. 93. (12).

Fyrillas, M.M., Leontiou, T.(2016). Critical Biot Number of a Periodic Array of Rectangular Fins . Journal of Heat Transfer. 138. (2).

Leontiou, T., Ikram, M., Beketayev, K., Fyrillas, M.M.(2016). Heat transfer enhancement of a periodic array of isothermal pipes . International Journal of Thermal Sciences. 104. p. 480-488.

Savva, I., Evaggelou, E., Papaparaskeva, G., Leontiou, T., Stylianopoulos, T., Mpekris, F., Stylianou, K., Krasia-Christoforou, T.(2015). Alignment of electrospun polymer fibers using a concave collector . RSC Advances. 5. (126). p. 104400-104407.

Alexandrou, C., Leontiou, T., Papanicolas, C.N., Stiliaris, E.(2015). Novel analysis method for excited states in lattice QCD: The nucleon case . Physical Review D - Particles, Fields, Gravitation and Cosmology. 91. (1).

Alexandrou, C., Korzec, T., Koutsou, G., Leontiou, T.(2014). Nucleon excited states in N f = 2 lattice QCD . Physical Review D - Particles, Fields, Gravitation and Cosmology. 89. (3).

Leontiou, T., Fyrillas, M.M.(2014). Shape optimization with isoperimetric constraints for isothermal pipes embedded in an insulated slab . Journal of Heat Transfer. 136. (9).

Georgiou, C., Leontiou, T., Kelires, P.C.(2014). Shaping the composition profiles in heteroepitaxial quantum dots: Interplay of thermodynamic and kinetic effects . AIP Advances. 4. (7).

Alexandrou, C., Constantinou, M., Drach, V., Hadjiyiannakou, K., Jansen, K., Kallidonis, C., Koutsou, G., Leontiou, T., Vaquero, A.(2013). Nucleon structure using lattice QCD . Nuovo Cimento della Societa Italiana di Fisica C. 36. (5). p. 111-120.

Leontiou, T., Kotsonis, M., Fyrillas, M.M.(2013). Optimum isothermal surfaces that maximize heat transfer . International Journal of Heat and Mass Transfer. 63. p. 13-19.

Leontiou, T., Tersoff, J., Kelires, P.C.(2010). Suppression of intermixing in strain-relaxed epitaxial layers . Physical Review Letters. 105. (23).

Alexandrou, C., Koutsou, G., Leontiou, T., Negele, J.W., Tsapalis, A.(2009). Erratum: Axial nucleon and nucleon to Δ form factors and the Goldberger-Treiman relations from lattice QCD (Phys. Rev. D (2007) 76 (094511)) . Physical Review D - Particles, Fields, Gravitation and Cosmology. 80. (9).

Alexandrou, C., Korzec, T., Koutsou, G., Leontiou, Th., Lorc&#233;, C., Negele, J.W., Pascalutsa, V., Tsapalis, A., Vanderhaeghen, M.(2009). Δ-baryon electromagnetic form factors in lattice QCD . Physical Review D - Particles, Fields, Gravitation and Cosmology. 79. (1).

Alexandrou, C., Koutsou, G., Leontiou, Th., Negele, J.W., Tsapalis, A.(2007). Axial nucleon and nucleon to Δ form factors and the Goldberger-Treiman relations from lattice QCD . Physical Review D - Particles, Fields, Gravitation and Cosmology. 76. (9).

Alexandrou, C., Leontiou, Th., Negele, J.W., Tsapalis, A.(2007). N-to-Δ axial transition form factors from lattice QCD . Physical Review Letters. 98. (5).

Leontiou, T., Walet, N.R.(2004). Variational Monte Carlo for microscopic cluster models . International Journal of Modern Physics C. 15. (10). p. 1329-1351.

PREPRINT

Theodoros Leontiou, Anna Frixou, Marios Charalambides, Efstathios Stiliaris, Costas N. Papanicolas, Sofia Nicolaidou, Antonis Papadakis (2024). 3D Thermal Tomography with Physics-Informed Neural Networks .

CONFERENCE PAPER

Haralambous, H., Leontiou, T.(2019). Detection of TID activity from ionogram virtual height variations . 2019 URSI Asia-Pacific Radio Science Conference, AP-RASC 2019.

Berlin, J., Abdel-Rehim, A., Alexandrou, C., Brida, M.D., Finkenrath, J., Gravina, M., Leontiou, T., Wagner, M.(2016). Importance of closed quark loops for lattice QCD studies of tetraquarks . Proceedings of Science. Part F128557.

Finkenrath, J., Alexandrou, C., Berlin, J., Brida, M.D., Leontiou, T., Wagner, M.(2016). Using a new analysis method to extract excited states in the scalar meson sector . Proceedings of Science. Part F128557.

Alexandrou, C., Constantinou, M., Dinter, S., Drach, V., Jansen, K., Leontiou, T., Renner, D.B.(2011). Excited state effects in nucleon matrix element calculations . Proceedings of Science. 139.

Alexandrou, C., Korzec, T., Leontiou, T., Negele, J.W., Tsapalis, A.(2007). Electromagnetic form factors of the ∆ baryon . Proceedings of Science. 42.

Alexandrou, C., Koutsou, G., Leontiou, T., Negele, J.W., Tsapalis, A.(2007). Nucleon and Nucleon-to-∆ Axial Form Factors from Lattice QCD . Proceedings of Science. 42.

Alexandrou, C., Leontiou, T., Negele, J.W., Tsapalis, A.(2006). The N to Δ axial transition form factors in quenched and unquenched QCD . Proceedings of Science. 32.

Alexandrou, C., Edwards, R., Koutsou, G., Leontiou, T., Neff, H., Negele, J.W., Schroers, W., Tsapalis, A.(2005). A study of the N to ∇ transition form factors in full QCD . Proceedings of Science. 20.

WORKING PAPER

3D Thermal Tomography with Physics-Informed Neural Networks .