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Ali Ghaderi

  • Porsgrunn Norway


I did my undergraduate studies in electronics and my MSc in Mathematics. My PhD was in Chemical engineering with focus on granular materials. My education along with years of industrial R&D have given me an expertise base which spans over many different fields of science and engineering. Through my career I have applied my skills in subjects which span from fluid mechanics to real-time measurement systems and as diverse as people management and foundation of science. My broad experience has given me the flexibility to work in many different environments, from academia to factory floor. I consider myself an interdisciplinary scientist who enjoys working with experts from different fields of science and engineering. I know what it takes to create new knowledge, transfer the knowledge to other people and materialize it in form of new technology.


Bayesian Statistics
I apply the maximum Entropy principle (MaxEnt) and Bayesian probability theory in modelling of physical systems from first principles and experimental data. At present I am working on development of a method for pattern recognition.
My recent study is on effect of impurities on electrical properties of doped Silicon. My previous work was on extension of statistical mechanics to theory of granular materials. I have also worked on application of Lie theory to Bianchi cosmological models.

In the past years I have been working on mathematical statistics. Before that my study was focused on symmetry, differential geometry, Lie theory and their application to theory of ordinary differential equations.

Chemical engineering

I am presently interested on probabilistic models for internal turbulent flow. I have also worked on modelling of motion of particles in viscous fluids and flow through porous media. In my PhD, I developed a mathematical theory for mixing of granular materials.

Image analysis
My recent work is on scale-space theory and its application to image processing. I have recently developed a Bayesian extension of Otsu's thresholding method. This is currently used for characterization of Photo-luminescence and dislocation etch-pit images for solar grade multi-crystalline Silicon wafers. 
Instrumentation and signal processing

I have worked on design and implementation of measurement systems. My strength is in design of model-based measurement systems. At present I am working on characterization of Photoluminescence images of multi-crystalline Silicon wafers. My recent work was on development of THz imaging of Si3N4 coating. In recent years I have also contributed in development of two major technologies; fast NIR based in-line crack detection for multi-crystalline Silicon wafers and in-line mass flow measurement for gas-particle systems.

Computer science
I worked on design and development of cloud computing and data mining systems for REC Wafer Technology. I am an advanced level LabVIEW programmer. In addition I have intermediate skills in Mathematica. I am also familiar with SQL programming and PHP language. 

Selected Contributions

Samples of some of my contributions, which are presently in use in industry.

Work History

Jan 2016Present

Guest Scientist

University College of Southeast Norway

I am working on topics in probability theory and pattern recognition. I am also teaching part time in several subjects. As a lecturer I am teaching topics in classical physics, physical chemistry and statistics. 

Oct 2013Dec 2015

Guest Scientist

Telemark University College (HiT)

My main objective was to publish several years of my research in different fields. My work is organized under categories of mathematical sciences and engineering (for more details check my HiT page). During this period I also work as substitute lecturer in undergraduate physics courses at the college.

Jan 2007Aug 2012

Senior Technologist

REC Wafer Norway AS

My activities during my employment can be divided into following categories (my roles):

  • Measurement technology development/improvement for in-line wafer inspection in REC's Wafer factories including the support and education of the key personal (specialist knowledge responsible)
  • Identification and development of new measurement concepts for characterization of as-cut Si-wafers (technology hunting and transfer)
  • Development of probabilistic models for real-time risk management (lead developer)
  • Silicon Feed-stock quality with expertise in handing of Silicon granulates- FBR (specification owner)
  • Improvement of work environment through representation of employees in organisational development projects (leader for local Tekna group)
Jul 2005Dec 2006

Senior Scientist

Telemark Technological Research and Development Centre (TEL-TEK)

During my employment I worked on many research projects related to handling of granular materials. Some of the most important projects were:

  • Effect of Bulk Handling on Magnetic Susceptibility of Drilling Fluids with application to Oilfield horizontal directional drilling (HDD).  I was representing Tel-Tek in the scientific team.
  • Optimization  and Control of Erosion during Pneumatic Conveying on Oil Rigs.  I was a sub-project leader.
  • Development of in-line mass flow measurement system for pneumatic conveying systems.  I developed the probabilistic model and the real-time analysis software.
  • Development of mathematical model for motion of cylindrical particles in viscous fluids.  I conducted the theoretical research.
Aug 2000Sep 2004

Research fellow

Telemark University College (HiT)

During my studies at University of Surrey I was employed at HiT as research fellow where I received a scholarship from the Norwegian research council for 3 years. 

Aug 1994Jun 1997

Student assistent


My work can be divided into two parts:

  • Helping students in undergraduate mathematics courses. I was responsible for 24 students during each term.
  • Active participant in a project called "problem-oriented teaching of mathematics".


Aug 2002Mar 2007

Doctor of Philosophy (PhD)

University of Surrey

Thesis title:  A Mathematical Theory for Mixing of Particulate Materials

Supervisors: Ugur Tüzün, Sunil de Silva, Gisle Enstad

The objective of my PhD work was to develop a new theoretical framework, founded on the probability theory,  for characterization of particulate materials with application to process of mixing.

Aug 2000Aug 2002

Master of Philosophy (MPhil)

University of Surrey

Thesis title: Continuous mixing of Particulate materials

Supervisors: Ugur Tüzün, Sunil de Silva

In this work I developed a mathematical model based on the concept of variogram for characterization of continuous mixing of Particulate materials.

Aug 1991Jun 1997

Master of Science (MSc)


Thesis title: On Classification of String- and Space-like Homogeneous Submanifolds in Bianchi Cosmological Models.

Supervisors: Boris P. Komrakov (winner of 1997 Lobachevsky prize), Boris Doubrov, Eldar Straume

In this work I gave a complete classification of certain Lie subgroups important in String theory.

Visiting Scholar

  • Nov-Dec 2011: Collaborative research, University of New South Wales at Australian Defence Force Academy (ADFA). The topic was: Probabilistic approach to modelling of internal turbulent flow.
  • Oct-Nov 2011:Visiting Technologist, REC Wafer Technology Singapore. The topic was: Characterization of electrical properties of Silicon wafers based on Photo-luminescent and dislocation etch-pit density.

Selected Publications

  1. On coarse graining of information and its application to pattern recognition, Ali Ghaderi, AIP Conference Proceedings, 1641, 453-470, 2015.
  2. Quantification of LID in multicrystalline silicon wafers, Rune Søndenå, Ali Ghaderi, Proceedings of the 29th European Photovoltaic Solar Energy Conference, 776-779, Amsterdam, Netherlands, 2014.
  3. Characterization of dislocation-content in multi-crystalline Silicon wafers, Ali Ghaderi, Semih Senkader, Solid state phenomena, 205/206, 65-70, 2014.
  4. Air mass balance for mass flow rate calculation in pneumatic conveying, Cecilia Arakaki, Ali Ghaderi, Arild Sæther, Chandana Ratnayake, Gisle G. Enstad, Powder technology, 202, 1, 62-70, 2010. 
  5. A new model for mass flow measurement in pneumatic conveying, Cecilia Arakaki, Ali Ghaderi, Biplab K. Datta, Proceedings of Partec 2007, International Conference on Particle Technology, Nürnberg, Germany, 2007.
  6. Non intrusive mass flow measurement in pneumatic transport, Cecilia Arakaki, Ali Ghaderi, Biplab K. Datta, Bernt Lie, Proceedings of the 5th international conference for conveying and handling of particulate solids, Sorrento, Italy, 2006.
  7. On characterization of continuous mixing of particulate materials, Ali Ghaderi, Particulate science and technology, 21, 3, 271-282, 2003.
  8. Continuous mixing of particulate materials, Ali Ghaderi, Proceeding of 4th International Conference for Conveying and Handling of Particulate Solids, 2, 9.43-9.47, Budapest, Hungary, 2003.
  9. On classification of string- and space-like homogeneous submanifolds in Bianchi cosmological models, Ali Ghaderi, Amir Ghaderi, Group 21: Physical applications and mathematical aspects of geometry, groups and algebras, 2, 693-697, World Scientific Publishing, Singapore, 1997.
  10. Gåten om spesifikk varmekapasitet (the specific heat riddle), Ali Ghaderi, SYMMETRI-Nordic Journal for Physics and Mathematics, 3, 1/2, 2-16, 1996.
  11. Just SO(2) stories: How Lie theory was applied to a problem with great past, Ali Ghaderi, K. Razi Naqvi,  SYMMETRI-Nordic Journal for Physics and Mathematics, 2, 3, 45-49, 1995.

Invited Scientific Talks And Lectures

24-25 May (2016): Scientific inference, 2-Day seminar; University college of Southeast Norway.

05 Nov. (2015): The governing rules of uncertainty and why should everyone know them; University college of Telemark,  TMCC forum

08 Nov. (2006): Introduction to Multivariate Analysis for industrial engineers; Tel-Tek

19-20 Sept. (2006): Introduction to Stochastic Modelling and Control of Powder Processes; Tekna seminar

06 Mar. (2006): On Statistical Mechanics of Powders; University of Stavanger

Presentations at International Conferences

Sept. 2014: On coarse graining of information and its application to pattern recognition; 34rd International Workshop on Bayesian Inference and Maximum Entropy Methods in Science and Engineering (MaxEnt 2014). Amboise, France.

Sept. 2013: Characterisation of dislocation content in multicrystallinesilicon wafers; Gettering and Defect Engineering in Semiconductor Technology 2013 (GADEST 2013). Oxford, UK.

Dec. 2013: On coarse graining of information and prior probabilities; 33rd International Workshop on Bayesian Inference and Maximum Entropy Methods in Science and Engineering (MaxEnt 2013). Canberra, Australia.

Sept. 2010: On in-line NIR based defect detection systems for multi-crystalline silicon wafers; The 23th European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC 2008). Valencia, Spain.

Jul. 2009: On Application of MaxEnt to Modelling of Complex Systems; 29th International Workshop on Bayesian Inference and Maximum Entropy Methods in Science and Engineering (MaxEnt 2009). Oxford, USA.

Jul. 2006: On Characterization of Mixture of Granular Materials; Gordon Conference on Granular & Granular-Fluid Flow (GRC). Oxford, UK.

Aug. 2005: On Statistical Theory for Granular Matters ; News, EXpectations and Trends in Statistical Physics (NEXT-SigmaPhi). Crete, Greece.

May 2003: Continuous Mixing of Particulate Materials;  4th International Conference for Conveying and Handling of Particulate Solids (CHoPS 2003). Budapest, Hungary.

Jul. 1996: Classification of Time-like Surfaces and Space-like Hyper surfaces in 4-dimensional Bianchi Cosmological Classes; 21st International Colloquium on Group Theoretical Methods in Physics (Group 21). Goslar, Germany.

Extracurricular activities

2010-2011: Leadership and management: A series of 4 seminars arranged by REC Wafer Norway AS. 

Aug. 2002:  Workshop in Theoretical Physics: Particle Size Segregation, Mixing and Pattern Formation in Granular Materials, Lancaster, United Kingdom.

Jan. 1999: Twelfth Chris Engelbrecht Summer School in Theoretical Physics, Sand piles, Random Systems and Random Walks: Analytic methods and simulation. Stellenbosch, South Africa.

Jun. 1997: Andøya Rocket Range Summer School, Space Technology. Andenes, Norway.

Jun. 1996: Summer School in Mathematics: Lie symmetry software with applications to nonlinear Problems. Nordfjordeid, Norway.

Jun. 1995: Summer School in Mathematics: i) Lie algebras and ordinary differential equations. ii)Low Dimensional Homogeneous Spaces. iii) Topology and Geometry in Low Dimension–Two and Three Manifolds. Nordfjordeid, Norway.

Organizational Activities

2009-2011: Society for Technical Graduates and Scientific Professionals  (Tekna), Local union leader at REC

2002-2003: Research, Development and Doctoral committee (FUDU), board member at Telemark University College.

1996-1999: Foundation for Promotion of Interdisciplinary Activities in Natural Sciences (SFTVN), board member

1996-1999: SYMMETRI- Nordic Journal for Physics and Mathematics, Column Editor

1989-1991: Ski & Ballklubben Skiold, Football manager

1989-1991: Iranian association in Drammen, Board member

Awards and Recognitions

2016: I was one of the finalist in Morgenbladet’s search for finding the 10 most fantastic lecturers in Norway. I was nominated for the subjects of physics and mathematics.

2004: First runner up in Innovation-cup competition with the entry title "Real-time determination of lateral position of drill bit in directional drilling of oil wells". I received monetary award.

1996: Mathematics and Statistics institute, NTNU, I received a stipend.

1995 & 1996: Legat til Henrik Homans minne, I received stipend in both years.

1990 & 1991: Nils Henrik Abel mathematical competition, I received recognition diplomas in both years.


  • Persian (Native or bilingual proficiency)
  • Norwegian (Full professional proficiency)
  • English (Full professional proficiency)
  • Swedish (Limited working proficiency)
  • Danish (Limited working proficiency)
  • Urdu (Elementary proficiency)
  • Arabic (Elementary proficiency)