1996 December - 21 articles
As known, 2XXX and 7XXX Aluminum process alloys can have high strength values by means of precipitation hardening heat treatment. Determination of the precipitation hardening conditions which can give the most suitable strength values of an alloy, re...
An expert process planning and fixturing system described in [14] is improved here by applying Boolean operations. This system uses forward planning strategy, i.e. begins with the blank part and applies some operations for each face or feature until...
Dynamic analysis of gearboxes especially driven at high speeds has always been an area of interest for researchers. It is important to know the dynamic behaviour of a gearbox to operate it more efficiently from the friction and vibration point of vie...
This paper discusses the advantages of the δ-operator over the forward shift operator q in implementation of discrete-time systems. The δ-operator gives better coemcient representation and less round-off noise in many cases. As an application, a new...
In this article the symmetries of a class of nonlinear telegraph equations are examined. These equations represent a physical model describing electro magnetic shock waves. The main interest is concentrated on potential symmetries but Lie point and n...
This paper deals with far-field microwave imaging of a dielectric object satisfying the Born approximation. The results of computer simulations obtained with a circular measuring geometry are given. The computational efficiency of this method is also...
In this paper , considering the Darboux instantaneous rotation vector of a solid perpendicular trihedron in the Minkowski 3-space R13, the Frenet instantaneous rotation vector was stated for the Frenet trihedron of a space -like space curve (c) with...
A new approach was studied in this paper to calculate minimum permeance (Pmin) of variable reluctance machines (VRM). Finite element method (FEM) and neural network (NN) were employed together for estimation. The data collected by an electromagnetic...
The calculation for the buckling of a short bar under compression occurs normally through the neglect of its own weight. This method is no longer permissible for long heavy bars. In this case, the net weight must be taken into consideration. Such lon...
In this work, we determine the trallscendence measure of the formal Laurent series "that" [...]
During the 1980s various approaches to batch-type manufacturing environments were implemented. The most popular of these were Material Requirements Planning (MRP), Group Technology (GT) and Just-In-Time (JIT). However few successful implementations o...
A synthetic receive aperture technique is explored for cost-effective ultrasound scanners with high frame rates and beam density. The technique provides ultrasound volumetric imaging where beam count is very large with 2-D transducer arrays using sub...
In this paper, depending on the Darboux instantaneous rotation vector of a solid perpendicular trihedron in the Minkowski 3-space [...]
In this study, the E. Study mapping was dermed for the space-like and time-like lines in the Minkowski 3-space R13. Hence, there is one to one correspondence between directed space-like (resp., time-like) lines of R13 and ordered pair of vectors (a,a...
In this study, a fundamental relation, as a base for the geometry of the time-like surfaces, among the Darboux vectors of an arbitrary time-like curve (c) on a time-like surface and the parameter curves (c1) and (c2) in the Minkowski 3-space R13 was...
A finite element model is presented for investigating dynamic behavior of drillstrings used in oil and gas wells. A Timoshenko beam element is used to model axial and transverse vibrations. The effect of axial load, gravity, the constraints due to st...
In this investigation an approach buclcling analysis for simply supported rectangular reinforced concrete plates under uniaxial compression are developed. The objective of this investigation is to compare buclcling load of the reinforced plate with c...
Energy distribution systems were developed in the recent years due to increasing population, new technologies and load demand. Alternative technical arrangements are made trouble to choose the best construction. On the other hand, system costs are...
In this paper, a new technique to recognize and process Barcodes is introduced. The technique employs Inductive Learning. It is suitable to use, for example, in a factory to control the workers, staff, stock etc. In this technique only vertical lines...
In this paper some interesting invariants of twist knots are calculated. Especially the first homotopy and the first homology groups of all three sheeted branched covering spaces of the three dimensional sphere branched over twist knots are given.
