UET Peshawar Publications Site (University of Engineering and Technology, Peshawar)
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A CONTRIBUTION TO THE UNDERSTANDING OF MIXED-FLOW CENTRIPETAL TURBINE IN STEADY FLOW
No full textThis paper describes the experimental results of a highly loaded mixed-flow turbocharged turbine for automotive application. The results revealed its better design and off-design performance relative to conventional radial-inflow configuration.Theadvantagesoffered bythe constantblade angle rotorallow better turbocharger engine matching.The efficiency characteristics of the mixed-flow inlet geometry understeadyflow have proved tobefairlyflat, giving a plateau of high efficiency. The outcome of the blading with forward swept at inlet was clearly seen in the shifting of the higher peak efficiencies towards higher expansion ratios or lower velocity ratios, where the engine-exhaust pulse energy is maximum, but without departing from the criterion of radial blade fibres. The entire range swallowing capacity curves of this turbine were observed to be flatter and closely followed a reference radial-inflow turbine "matching line” that showed good turbocharger-engine matching over the operating range of the engine. A comparison with the results obtained from a radial turbine under similar test conditions showed that the swallowing capacity was higher and peakefficiency were achieved at lower velocity ratio in the case of mixed-flow turbine, which represented an improvement relative to corresponding values in a typical radial-inflow counterpart.
 
EMULSIFIED REAGENT MIXTURE’S EFFECTS ON COAL FLOTATION
No full textA series of tests were conducted with different reagent mixtures already containing collector, frother and polymer. Then 2% emulsifier was added to examine its effects on the overall efficiency of coal flotation process in general and ash, yield, recovery and the rate of flotation in particular. The results were also compared with non-emulsified reagent mixture.
A conventional batch flotation procedure was used in the laboratory test work with standard parameters and conditions.The reagent mixture was the only variable which was tested at different dosage to easily analyze the flotationresults.
It was observed that at lower dosages of each reagent mixture, the overall performance was enhanced by the addition of emulsifier as compared to non-emulsified reagent mixture. It also resulted in higher recovery of combustiblematerial with low percentage of ash content. The % recovery remained almost the same as was observed in the nonemulsified reagent. At higher dosages, the efficiency was adversely effected by the addition of emulsifier in the reagentmixtures. However, the increase in the percent weight yield with low % of recovery and high ash content was noticed
MINIMUM VARIANCE UNBIASED ESTIMATION (MVUE) OF THE PROBABILITY FUNCTION
No full textThe purpose of this article is to present an easy procedure to derive MVUE of a probability distribution. The procedure is then explained by estimating some well known probability distributions with the hope that it will attract theattention of students and teachers of Statistics
DEVELOPMENT OF BACKGROUND AND DETERMINATION OF CRITICAL STATE PARAMETERS
No full textA companion paper by the author described the "Prediction of drained behavior from undrained behavior of clay soil". As noted in that paper the principles of critical states soil mechanics and several of the critical state parameters have been used in making the prediction. For readers not familiar with the concept of critical state soil mechanics and its parameters its concepts relevant to the paper are. briefly explained and procedures for critical state parameters determination are presented. For such readers this is the prerequisite of that paper
DESIGN OF OVERHEAD CRANE: A NEW TECHNIQUE
No full textThis paper explains the methodology of converting the conventional design process of overhead cranes to Computer Aided Design (CAD), the software engineering approach and usage of different tools in order to get a computer based solution. Applications of parametric design and design for manufacturing concepts may also be seen. The main idea is to automate the drafting process by linking it to design and analysis phase
SIMPLIFIED ANALYTICAL MODEL FOR AXIALLY LOADED BOLTS
No full textThe reliability of numerical modelling results depends upon the model itself and on the accuracy of input parameters. The stiffness of the rock-bolt interface is one of the governing parameters while axially loaded rock-bolts are simulated numerically as internal ground support. This research was carried out to develop a simplified analytical model to calculate the stiffness of the rock-bolt interface while taking into account the apparent stiffness obtained from laboratory pullout tests. A differential equation was derived, assuming a rigid rock, uniform stiffness along the bolt , and the rock-bolt interface was simulated in the form of a series of continuous springs. This equation was solved to obtain displacement and load distribution along the bolt. A computer program called SAMAX (Simplified Analytical Model for Axially loaded bolts), was written in FORTRAN to calculate displacement along the bolt and stiffness of the ground. The model was tested, the results verified and a parametric study has been carried out. SAMAX output in the form of displacement distribution along the bolt, calculation of the stiffness of rock-bolt interface is presented in the paper, along with other relevant graphs
THE USE OF HIGH RESOLUTION (1 KM) AVHRR DATA IN VEGETATION MONITORING
No full textA literature review is presented of published investigations that relate to the use of Advanced Very High Resolution Radiometer (AVHRR) data from the TIROS (Television and Infra-Red Observation Satellite)- N series of meteorological satellites for monitoring vegetation throughout the world. In this review attention is focused on the use of direct read out High Resolution Picture Transmission (HRPT) data or recorded Local Area Coverage (LAC) data. The credibility that 1 Km data has achieved in the agriculture monitoring programs of countries where its utility was not previously exploited is also documented
OPTIMUM WIND ANGLE FOR FILAMENT WOUND COMPOSITE TUBES UNDER HOOP PRESSURE LOADING
No full textThis paper presents the wind angle effect of fibers on the hoop strength or hurst pressure of filament wound composite tubes. Glass fiber roving and epoxy resin combination was used as fiber matrix system. Five symmetric winding patterns were selected for composite tubes. The theoretical hoop strength or burst pressure has been determined using laminate theory of orthotopic materials. The hoop strength or burst pressure was also determined experimentally by subjecting the tubes to hoop pressure loading till failure. The comparison shows a difference of 8% to 22 % between the experimental results and those obtained from theoretical model based on laminate theory. It was found that under hoop pressure loading of filament wound tubes, the optimum wind angle is ± 75° and the tube failure is associated with a crack parallel to the wind angle of fibers. For the ± 85 ° wind angle the crack is circumfrential and is associated with a burst pressure considerably lower than that associated with the ± 75° wind angle for the tubes of same thickness
POLICY ISSUES RELATING TO THE DEVELOPMENT OF IT SECTOR
No full textThis paper attempts to describe the significance of information technology (IT) in development. An attempt is made to explore global information issues which confront the planners and policy makers in Pakistan, to design information strategy, that may be capable of handling the general information issues relating to information at global level
EFFECT OF DRY DENSITY VARIATION ON THE COEFFICIENT OF CONSOLIDATION OF A SATURATED COHESIVE SOIL
No full textThis paper presents the consolidation behaviour of saturated cohesive soils at various dry densities and consolidation pressures. Several soil samples at various densities were studied to determine the effect of dry density on the coefficient of consolidation of cohesive soil and established a relationship between the two