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السجلات المعروضة 1 -- 20 من 8924
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M-Profile ray tracing technique for multipath propagation
( IET , 1987 , Article)A model for the modified refractivity is suggested and used in a new and simple ray tracing approach for multipath propagation. The technique is then used to study the variations in ray path parameters for different path ... -
Performance Evaluation of A Class of Adaptive Bifurcated Routing Algorithms
( Qatar University , 1988 , Article)With the cost of computation decreasing, packet-switched computer communication networks are becoming increasingly cost effective. In this paper a class of bifurcated routing algorithms is considered. One of the algorithms ... -
On the Design of Bit-Slice Processors
( Qatar University , 1988 , Article)In the past decade, fixed instruction microprocessors have evolved from 4 bits to 32 bits. Their compact design and relative low cost have made them very popular with design engineers. Their use extends into a lot of ... -
DESIGN AND UTILIZATION OF A LOW-COST FLEXIBLE MANUFACTURING CELL
( IEEE , 1988 , Conference)This paper describes how to establish and efficiently utilize a low-cost Flexible Manufacturing (FM) cell for education, light machining and assembly operations. The cell comprises a microcomputer, manufacturing workstations, ... -
Diffusion of saturated hydrocarbons in low density polyethylene (LDPE) films
( Wiley Subscription Services, Inc. , 1989 , Article)The diffusion coefficients at zero penetrant concentration, D0, of n-heptane, n-heptane, n-octane, n-decane, and 2,2,4-trimethylpentane (TMP) in LDPE were obtained in the range of 25–50°C, using the desorption method. The ... -
INDIRECT PRESSURE MEASUREMENT FOR FUNCTIONALLY INACCESSIBLE VESSELS
( Blackwell Publishing Ltd , 1989 , Article) -
Study of A Time Dependent Double -Diffusive Salinity Problem
( Qatar University , 1989 , Article)The time-dependent, double diffusive stability problem for a horizontal layer of salty water bounded by two rigid isothermal surfaces is analyzed using a linear perturbation technique. Initially, the layer is subjected to ... -
Dynamic behavior of mixer-settlers
( Wiley Subscription Services, Inc., A Wiley Company , 1990 , Article)A mathematical model has been developed to simulate and predict the dynamic behavior of liquid extraction counter current operations in mixer-settler units. Murphree efficiency has been included in the model. The behavior ... -
Performance of Greenhouses in The Arabian Gulf
( Qatar University , 1990 , Article)This work is devoted to the gaining of insight into the operation of environmentally controlled greenhouse in hot and humid climates. Field data inside and outside the greenhouse, namely: solar radiation, dry and wet bulb ... -
Thermal dimensional stability of isotropic polyoxymethylene
( John Wiley & Sons, Ltd. , 1991 , Article)A parametric mapping analysis of the effect of various structural and morphological parameters on the thermal dimensional stability of polyoxymethylene is highlighted. The molecular composites model is found to describe ... -
Solidification Of Steel Billets In Continuous Casting
( Qatar University , 1991 , Article)For practical operation, it is necessary to know how the solidification of liquid steel progresses i.e. when and where a strand has completely solidified. Decisions on, the casting speed, the spray water flow rates and ... -
Performance Evaluation Of A Msf Desalination Plant In Qatar
( Qatar University , 1992 , Article)In this paper, an assessment of the performance of one of the multistage flash (MSF) desalination units operating in conjunction with the gas-turbine cogenera-tion power plant in Qatar is carried out under different operating ... -
The use of Robot Redundancy in Contour Path Operations for Selected Manufacturing Applications
( IEEE , 1992 , Conference)Redundant robots have many applications and use in path synthesis for crowded workspace and in minimum time control path tracking problems. In selected manufacturing applications - such as spray painting, continuous welding, ... -
A coupled vector-scalar potential method for permanent magnet modeling in large-scale 3D-FE magnetic field computations
( IEEE , 1993 , Article)This paper introduces a magnetic scalar potential (MSP) formulation to model permanent magnet volumes. This formulation is suited for use in coupled vector-scalar magnetic potential (CMVP-MSP) 3D-FE computations of large-scale ... -
An Adaptive Newton-Raphson Technique for Combined Vector-Scalar Potential Solutions of Large Scale 3D Magnetic Field Problems Involving Anisotropic Materials
( IEEE , 1993 , Article)In general, magnetic field problems in electrical devices and machines are of nonlinear nature due to magnetic saturation in their ferrous cores. In the combined magnetic vector-magnetic scalar potential (MVP-MSP) method ... -
Teaching Electric Machinery and Associated Electromagnetic Fields-A Case for the Benefits of Academic Computing
( IEEE , 1993 , Article)This paper describes three broad categories of benefits resulting from use of and access to personal computers (PCs) and work stations (WSs) in teaching electric machines and drives. This includes all the electromagnetic ... -
Ultrasonic and thermal properties of γ-irradiated low-density polyethylene
( John Wiley & Sons, Inc. , 1993 , Article)The ultrasonic pulse-echo technique and differential thermal analysis were utilized to characterize and to monitor the effect of ?-irradiation on the sonic modulus and the heat effect of low-density polyethylene. The sonic ... -
A Coupled Vector-scalar Potential Method For Permanent Magnet Modeling in Large-scale 3d-Fe Magnetic Field Computations
( IEEE , 1993 , Conference)This paper introduces a magnetic scalar potential (MSP) formulation of permanent magnet (PM) modeling. This formulation is suited for use in coupled (combined) vector-scalar magnetic potential (CMVP-MSP) 3D-FE algorithms ... -
Three dimensional magnetic field computation by a coupled vector-scalar potential method in brushless DC motors with skewed permanent magnet mounts - the formulation and FE grids
( IEEE , 1994 , Article)A three dimensional finite element (3D-FE) method for the computation of global distributions of 3D magnetic fields in electric machines containing permanent magnets is presented. The formulation of this 3D-FE method ... -
Modeling and experimental verification of the performance of a skew mounted permanent magnet brushless DC motor drive with parameters computed from 3D-FE magnetic field solutions
( IEEE , 1994 , Article)This paper contains a comparison between actual laboratory-measured performance of a brushless dc motor drive system, with skewed permanent magnet mounts on its rotor, and two computer-simulated motor drive system performance ...
