An-Najah National University

Dr. Hussain M. Alayan


  • Tuesday, December 1, 1998
  • Electronic structure of GaxIn1-xAsySb1-y quaternary alloy by recursion method
  • Published at:Nuovo Cimento Della Societa Italiana Di Fisica D-Condensed Matter Atomic Molecular and Chemical Physics Fluids Plasmas Biophysics Volume: 20 Issue: 12 Pages: 1871-1879 Published: Dec 1998
  • This work reports the electronic structure of GaInAsSb quaternary alloy by recursion method. A five-orbital sp(3)s* per atom model was used in the tight-binding representation of the Hamiltonian. The local density of states (LDOS), integrated density of states (IDOS) and structural energy (ST.E) were calculated for Ga, In, As and Sb sites in Ga0.5In0.5As0.5Sb0.5 and GaInAsSb lattice matched to GaAs and the same alloy lattice matched to GaSb. There are 216 atoms in our cluster arranged in a zincblend structure. The results are in good agreement with available information about the alloy.
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  • Tuesday, November 1, 1994
  • Petri-Net Modeling of Production Lines Containing Robots
  • Published at:Week of Science,# 34,Damascus,Syria
  • Abstract:
    This paper introduces Peri-Net models of robots for the analysis and design of robot implemented production lines. Petri-Nets are ideal for describing systems with flow of information or products, and. hence, natural for production lines.They also allow for treatment alt different levels of complexity.For production lilies implemented by robots we introduce different levels of robot models which can be used in any configuration, such as ring, protected ring, lattice or lineal lines. These models allow the determination via Petri-Nets of such things as throughput.
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  • Sunday, November 1, 1992
  • Economic Evaluation for Hard Automation Networks
  • Published at:Week of Science, Number Thirty Two, Nov. 1992, Damascus, Syria.
  • Abstract
    Hard automation networks are defined, and hard automated manufacturing network configuration of interest to full automated manufacturing of Gardner is presented with regard to their suitability to production process. The analogy of the performance of these topologies in terms of cost, cost effectiveness and comparative economic analysis to different types of manufacturing is presented with respect to robot networks software and hardware performance results.
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  • Monday, November 23, 1987
  • Processor Requirements for Reliable PCB Repair Via Robots in an Automated Test Center
  • Published at:International Symposium on Transfer of Computer Technology, Jordan Engineers Association, Nov. 23, 1987, Amman, Jordan.
    In this paper the feasibility of using robots for printed circuit board (PC3) automated repair (AR) is discussed. A technique is given where by robot PCB repair stations can be incorporated in the PCB automated integrated manu­facturing (AIM) systems of Gardner, and various requirements on the robots operating in such a system are discussed. Expressions are developed for the processor requirement to achieve a specified reliability of each operation within an operational area of Gardner useful in automated test center and repair (ATCR).
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  • Friday, May 1, 1987
  • Bianary Petri-Net Relationships
  • Published at:IEEE Transactions on Circuits and Systems, Vol. CAS-34, No. 5, May, 1987, U.S.A.
  • Abstract:
    A full set of equations describing binary Petri-nets is pre­sented in terms of integer algebra. In doing this, an equation is developed that allows for determination of the firing vector in terms of the markings and the input. Because the results are expressed in terms of integer arithmetic rather than Boolean algebra, they allow for extension to other classes of  Petri-nets as well as yield ease of programming for Petri-net analysis.
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Hussein Musa Omer Alyyan
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