Original Research Paper TVET
1. Investigation of Aluminum-Copper-Lithium Alloy Strengthening with Natural and Artificial Aging

S. Ahmadi; A. Shokouh Far; M.R. Abutalebi; A. Rezaee

Volume 1, Issue 4 , Autumn 2007, Pages 221-232

http://dx.doi.org/10.22061/tej.2007.1274

Abstract
  Aluminum-lithium alloys are among the ultra-lightweight and workable alloys that have replaced some air alloys (such as 2000 and 7000 groups) due to their higher elastic modulus and lower specific gravity. Increasing the mechanical properties of these alloys using various thermal-mechanical methods (Thermo ...  Read More

Original Research Paper Architecture
2. Evaluation of seismic behavior of steel frame combined with lightweight prefabricated panels under reciprocating load

M.Z Kabir; A. Abrisham Foroushan Asl; M. Khan alipour

Volume 1, Issue 4 , Autumn 2007, Pages 233-244

http://dx.doi.org/10.22061/tej.2007.1275

Abstract
  The use of prefabricated panels is one of the new methods of building construction, which has recently been used in the construction of interior and exterior walls, loaders and separators, as well as flooring in construction. This system includes two layers of welded wire mesh. On both sides, a layer ...  Read More

Original Research Paper TVET
3. Dynamic analysis of hysteresis motor permanent magnet synchronous Considering the effect of Foucault

Z. Nasiri Gheydari; H. Lessani; A. Darabi; F. Totonchian

Volume 1, Issue 4 , Autumn 2007, Pages 245-254

http://dx.doi.org/10.22061/tej.2007.1276

Abstract
  The permanent magnet hysteresis motor has the advantages of both the hysteresis motor and the permanent magnet. This engine is ideal for applications for electric vehicles, compressor pumps, robots and precision industrial drives, such as inertial navigation systems and video recorders that require high-performance ...  Read More

Original Research Paper TVET
4. Microcontrol optimization using microfilm with memory feature

A.R Dourandish; G.H Paygane; S. Agha Najafi; G.H. Dehghan

Volume 1, Issue 4 , Autumn 2007, Pages 255-263

http://dx.doi.org/10.22061/tej.2007.1277

Abstract
  The purpose of this paper is to examine the design method of a micro-constraint that, with proper performance, can automatically take a micro-part according to the important parameters of the reaction time and force, and after performing various steps on the part. Be. Release the piece and be ready to ...  Read More

Original Research Paper Architecture
5. Sensitivity analysis of penalty function parameters in operating optimization models of multi-purpose tanks

S. Ali Mohammadi; F. Ali Moradi; E. Jabbari

Volume 1, Issue 4 , Autumn 2007, Pages 265-273

http://dx.doi.org/10.22061/tej.2007.1278

Abstract
  One of the most important pillars of optimized multi-purpose reservoir optimization models is the definition of a penalty or loss function. Due to the variety of operating goals and the complexity of the system, they often use alternative functions instead of using profit and cost functions, which only ...  Read More

Original Research Paper Architecture
6. Cell design and creating device test to measure radial permeability in rocks

M. Hosseini

Volume 1, Issue 4 , Autumn 2007, Pages 275-283

http://dx.doi.org/10.22061/tej.2007.1279

Abstract
  Penetration is a very important feature in rocks and controls the flow of fluid inside the rocks. In most cells in mechanical laboratories, the water rock moves along the axis of the cylindrical pattern. These cells are used to determine the longitudinal permeability of the rock, while the fluid penetrates ...  Read More

Original Research Paper Architecture
7. The performance level of asymmetric steel bracing structures in a direction designed according to the standard 2800 third edition

M. Yahyaee; M. Moradi

Volume 1, Issue 4 , Autumn 2007, Pages 285-294

http://dx.doi.org/10.22061/tej.2007.1280

Abstract
  Considering the purpose of Regulation 2800, which is to ensure the safety of life at risk level 1, as well as the progress made in the design method based on the performance and development of new design regulations, in this study, asymmetric steel structures in one In order to have a coaxial brace that ...  Read More