UET Peshawar Publications Site (University of Engineering and Technology, Peshawar)
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OPTIMIZATION OF GAS TUNGSTEN ARC WELDING PARAMETERS ON PENETRATION DEPTH AND BEAD WIDTH USING TAGUCHI METHOD
No full textThe objective of this paper is the optimization of the gas tungsten arc welding parameters on penetration depth and bead width. Taguchi L25 orthogonal array was used for the design of experiments. Welding experiments were performed on stainless steel specimens. Pilot experimentations were conducting to defne the range of variables. Optimal parameters were determined through signal to noise (S/N) ratio approach. Signifcant factors have been determined through analysis of variance approach. The results showed that the penetration depth and bead width were increased with increase in current and decrease with increase in torch speed. It was concluded that the arc current is the signifcant factor for both the response parameters while torch angle is signifcant only for bead width. The results have been verifed through confrmation test for each response parameter
EXTRACTION OF GOLD AND SILVER BY CYANIDATION PROCESS FROM COMPLEX ORE OF SHOUGHUR AREA CHITRAL, KYBER PAKHTUNKHWA
No full textThe aim of the research work was to optimize the cyanidation leaching parameters for maximum extraction of gold and silver from complex ore of Shoughur area of district Chitral, Khyber Pakhtunkhwa on laboratory scale testing. The research work was carried out into two parts. In first part the cyanidation parameters like grinding time, dosage of pH, cyanidation time, dosage of sodium cyanide (NaCN) and dosage of lime Ca (OH)2 were optimized. The samples were subjected to differential grinding time varying from 20 to 35 minutes, pH of slurry adjusted from 9 to 11 by adding Ca (OH)2 from 0.5 to 1.5 gm/kg , dosage of NaCN varies from 0.1% to 0.02 % and cyanidation time varies from 0 to 40 hours. The maximum yielded of 71.82 gm/ton of gold grade and silver grade of 34.34 gm/ton was obtained at grinding time of 25 minutes, particle size 63 um, pH 10.40, cyanidation time of 37 hours and at lime dosage of 0.5gm/kg. In the second part the cyanidation process was applied on roasted and un-roasted ore samples. The cyanidation time and grinding time were optimized. The maximum grade of gold 71.82 ppm and silver 25.95 ppm was extracted from roasted ore samples at cyanidation time of 35 hours and grinding time of 30 minutes as compared to unroasted ore samples. It is concluded that cyanidation process on roasted ore samples gives encouraged results as compared to un-roasted ore sample
THE REDUCTION OF SPECIFIC ABSORPTION RATE AT DIFFERENT FREQUENCIES
No full textThis Paper is about the reduction of specifc absorption rate (SAR) of wearable rectangular patch antenna for 1.8GHz and 2.45GHz wireless applications. Antenna is designated on a 3mm X 3mm X 3mm resolution truncated Hugo body model in Computer simulation technology software. The ramifcation reveals the specifc absorption rate simulated value that were reduced by 89% compared to previously achieved SAR reduction of 83.5%. A reduction of power absorption was also noticed as the space of patch antenna increased. The SAR of Patch antennas are reduced from 0.0005 to 0.00041 SAR Avg (mW/g) at frequencies of 1.8GHZ & 2.45GHZ respectively resulting in a significant improvement in antenna performance. The improvement in directivity & gain has been observed and bandwidth of about 65% has achieved with Specifc absorption rate reduction
LOAD TRANSFER FROM HIGH STRENGTH CONCRETE COLUMNS THROUGH ORDINARY STRENGTH CONCRETE SLABS
No full textThis paper describes the results of tests of nine reinforced concrete column- slab specimens, in which the columns are of very strong concrete having about 10 k/sq in. compressive strength. While the intervening floor slabs are much weaker. The slab concretes range from about 3 - 6 k/sq in. compressive strength. In addition to the variation in the concrete strength, two different slab thicknesses are included. The interest in this series of tests is axial load transmission through the weaker slab concrete, and no moments are imposed on the slab-column connection. The data along with previously available data are analysed with three objectives. Firstly, to investigate the general adequacy of section 10.15 of the 1995 ACI code ( AC/ 318 - 95 ). The provisions do not appear to be conservation when the column concrete is extremely strong. Secondly, to develop a better understanding of the problem, and to develop a better prediction method or procedure. The third objective is to find out the appropriate parameters for the estimation of the apparent strength of the floor concrete to be used in calculation of the load carrying capacity of columns
ROBUST MULTIMODAL FACE RECOGNITION WITH PRE-PROCESSED KINECT RGB-D IMAGES
No full textResearchers have tried to improve the accuracy of face recognition by combining 2D and 3D images to overcomethe problems of illumination, pose variation and occlusion. Although combining 2D with 3D have shown better resultswhen compared with 2D images only, however applicability of these methods is inadequate in practical implementationsdue to high cost of 3D sensors, therefore we are using the low cost sensor Kinect acquired images. We doface recognition from RGB images, depth images and then we combine both RGB and depth maps i.e. concatenatedifferent Modalities to improve the accuracy of recognition. Depth maps have holes and noise induced from camerasensors, therefore we process them to remove these distortions and then we apply the face recognition algorithm.Experimental results reveal that the accuracy of face recognition can be increased by combining RGB and depthimages and applying pre-processing on depth maps which mitigate the effects of covariates such as holes and noisein the depth maps
Some Aggregation Operators for Bipolar-Valued Hesitant Fuzzy Information based on Einstein Operational Laws
No full textThis article is based on Einstein operations for bipolar-valued hesitant fuzzy sets (BVHFSs). We extend the concept of Einstein operators for BVHFSs by defining bipolar-valued hesitant fuzzy Einstein weighted averaging (BPVHFEWA) operators and weighted geometric (BPVHFEWG) operators. Similarly, we define ordered weighted averaging operators and hybrid operators i.e. BVHFEOWA operators, BVHFEOWG operators, BVHFEHA operator and BVHFEHG operator. Further, these operators are applied in decision making DM) problems
MAINTENANCE SYSTEM FOR HEAVY EARTH MOVING EQUIPMENT
No full textHeavy earth moving equipment’s are critical for completion of any developmental projects. Dams, schools, bridges or any mining related initiations are part of these infrastructure development projects. Usually the delays are due to the inefcient and ineffective maintenance procedures of the heavy earth moving equipment’s. Poor record keeping and un-systemized maintenance procedures leads to reducing the machine effective life cycle. To avoid catastrophic losses in production and, market share, a maintenance model for such equipment is developed. Heavy equipment availability is mandatory on site. Their movement is critical and usually limited. The data collected includes both manufacturer and operator requirement. Usually such equipment is treated as normal machine irrespective of the rough environment it works in. The analysis includes segregation, Pareto analysis and Five Why analysis. A dedicated maintenance model is proposed which includes checklist and proper maintenance schedule
MACHINERY SELECTION FOR DEMOLITION AND RECYCLING OF PAVEMENTS: A SIMULATION-BASED TOOL
No full textProper selection of the type and number of machinery on construction is critical to the total cost and duration of projects. This especially applies to projects involving using of heavy machinery such as earthmoving projects. Currently, many construction managers – especially in Pakistan, rely on their intuition and judgement based on past experience to select their construction machinery fleet confguration. This approach is obviously subjective and prone to inefcient utilization of resources. Computer-based tools, such as simulation models, have the potential to greatly beneft the construction mangers in their routine tasks. This paper presents a unique simulation tool based on the system dynamics methodology to help the construction manager in investigating the cost and duration implications of various combinations of machinery items. Utility of the developed model is illustrated with the help of a case study involving demolition and recycling of a flexible pavement
BAYESIAN FORECASTING USING NONLINEAR TIME SERIES MODELS
No full textIt is generally considered that the statistical forecasting methods are superior to the methods which are based on non statistical principles. Non statistical methods are less sophisticated and simple to understand for an ordinary person. This paper presents the forecast based on purely statistical methods called Bayesian forecasting. Asymmetric time series method have been used along with Kalman’s Filter results. GARCH process has been used to estimate the nonconstant variances in the observation equation and in the system equation. Finally the exchange rate of Pakistani rupee against U.K. pound is used for the forecasting purpose
THE 43RP> COMPUTER PROGRAM FOR THE SOLUTION OF THE THREE RESERVOIR PROBLEM IN HYDRAULICS
No full textComputer software has become the driving force for modern scientific investigation and engineering problem solving. Software is virtually inescapable in a modern world. This paper introduces a software named “ The 3RP ” which aims at studying and solving a problem of Fluid Mechanics and Hydraulics generally known as the Classical Three Reservoir Problem. Besides minimizing the hectic calculations involved in this problem, the 3RP is intended to serve as a pointer for Engineering Students and Practitioners that directs their attention towards the relatively unexplored vast area of software development for the subjects of Fluid Mechanics and Hydraulics