UET Peshawar Publications Site (University of Engineering and Technology, Peshawar)
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HYDRAULIC PERFORMANCE OF LOCALLY MADE LDPE-PIPES FOR DRIP IRRIGATION SYSTEMS
No full textLDPE pipes give controlled and efficient irrigation practices for plant-water requirement. All five sizes of pipes i.e. 13.0, 25.7, 31.5, 38 and 50 mm with wall thicknesses of 1.4, 1.8, 2.0, 2.5 and 3.0 mm respectively in 100 and 200 m lengths were selected for determination of pressure-discharge relationships, manufacturing coefficient of variation and friction coefficient. The pipes were operated at pressure ranging from 10 to 50 psi (7.00 - 35.00 meter head) with an increment of 5 psi. The discharge of different sizes of LDPE pipes was measured under various pressures. The average discharge of the pipes with 13.0, 25.7, 31.5, 38 and 50 mm pipe sizes between 10 to 50 psi pressure heads were 0.058, 0.301, 0.402, 0.909 and 2.076 Ips respectively for 100 meter pipe length and 0.056, 0.10, 0.13, 0.45 and 1.993 lps respectively for 200 meter pipe length. The average friction head loss of the pipes with 13.0, 25.7, 31.5, 38 and 50 mm pipe sizes between 10 to 50 psi pressure heads were 3.21, 2.51, 1.66, 3.99 and 3.64 meter per 100 meter pipe length and 6.44, 5.03, 3.15, 6.79 and 6.85 meter per 200 meter pipe length respectively. The average C-value of all sizes of selected pipes for both lengths between 10-50 psi was indicated 18% less than the recommend value.Results indicated that, the discharge, friction head losses and friction coefficient increased with the increase in pressure. This study helped describe the optimal pressure requirement to achieve the desirable discharge, low friction head losses and minimum friction coefficients
PLM SOLUTIONS: AN EMERGING TECHNOLOGY FOR PRODUCT DATA INTEGRATION ACROSS ENTERPRISE
No full textProduct lifecycle management (PLM) offers a major opportunity to manufacturers looking to enhance their business performance. Successful companies are increasingly taking on new business models and business processes as an ongoing way to outmaneuver their competition. There is a growing awareness that product and process innovation is a critical element of business success. This executive-level awareness is fueling investments in collaborative initiatives that are at the heart of PLM. The product lifecycle management (PLM) revolution is driven by the aero and auto (A&A) industry and its evolving need to become more collaborative, adaptive, flexible and responsive over last few years. Automotive and aerospace, the experts say, are the PLM bellwethers for the rest of manufacturing. The most desired tools, the web services, Java 2, Enterprise Edition and XML have provided the cheaper means for trading partners to make use of ED!, proving to be a catalyst for change. This paper reviews modern and changing trends in manufacturing industry with special reference to PLM solutions. What PLM solutions signify and how it solves known integration problems of enterprises. what is its architecture and how industry and vendors are shaping with this new concept is the topic of discussion. Finally what conclusion can be drawn about the future PLM solution offerings
COMPARISON OF DIFFERENT METHODS FOR KINEMATIC PILE MOMENT AT THE INTERFACE OF LAYERED SOIL PROFILE
No full textThe aim of this paper is to compare different simplified methods used for evaluating steady state kinematic pile bending moments in floating piles at the interface of two soil layers of vastly different shear modului. Four commonly used methods are discussed in this paper which are proposed by Nikolaou et al.1, Nikolaou and Gazetas2, Mylonakis3, and Ahmad et al.4. These methods are based on Beam on Dynamic Winkler Formulation (BDWF). A BDWF code is developed to find kinematic pile bending moment at the interface of two-layer soil deposit. The parameters related to soil, pile, and excitation frequency are varied over wide range. The results of the BDWF are then compared with the simplified equations. The standard deviation and mean are worked out for all the four methods. It is found that the method proposed by Ahmad et al.4 gives the least standard deviation
ADAPTIVE REAL-TIME STEPPER MOTOR SPEED CONTROL
No full textThis paper is about interfacing a stepper motor to a microcontroller-based board which is programmed to control the speed of a stepper motor in response to a coded input from the microcontroller board. It takes advantage of the microcontroller and its support modules to address the problem on a real-time implementation. A transducer may act to provide an electrical equivalent signal of a time-varying parameter such as temperature over a given range, which is digitized before fed to the microcontroller-based board.In this work, a microcontroller-based (using MICROCHIP PIC16F877 and a motor driver IC UCN5804) board is programmed to control the speed of a stepper motor in a response to varying digital input and is made to respond to properly to variations in specifications as well as to variations in an analog signal equivalent of a temperature transducer. The results of variations in step angle and divisor of a stepper motor on the preset value are reported.
 
NONDESTRUCTIVE TESTING AND EVALUATION OF CONCRETE STRUCTURES BY WAVE REFLECTION TECHNIQUE
No full textThe use of transverse wave reflection method in nondestructive evaluation of concrete structures is becoming very useful with the passage of time. This paper summarizes the results of an experimental study in which the wave reflection technique to nondestructive evaluation of the setting and hydration process of concrete has been applied. Results of the available test data demonstrate that the adopted method can reliably monitor the hydration process of concrete. It is noted that the wave reflection measurements and the initial setting time are interdependent. Another experimental study shows that the method can be used as a mean to measure the gain in compressive strength of concrete
EVALUATION OF INDUCTION MOTOR GROUND WALL INSULATION USING INFRARED THERMOGRAPHY
No full textIn this research work, an attempt has been made ,to study the behavior of form-wound stator bars that are subjected to steep-front pulse voltage waveforms by using infrared thermography. in this regard, an accelerated aging test is developed by using electrical and thermal stress conditions. The test conditions include; voltage amplitudes up to 3.5 kVp, pulse switching frequencies up to 3000 pps and test temperatures up to 155 degree Celsius. During the aging process surface temperature profiles are recorded with an infrared camera as a means for determining the highest stress regions. The experimental results show that both the voltage stress and the thermal losses are quantitatively higher with converter supply than in the case of power frequency
COMMON FIXED POINTS IN METRIC SPACES
No full textTheorems concerning the construction of common fixed points of self-mappings of a metric space satisfying a contractive type condition are obtained by constructing two sequences of iterates of three mappings.
 
EXPERIMENTAL STUDY OF ELASTIC RESPONSE OF I - BEAM BRIDGE SUPERSTRUCTURE EXPERIMENTAL AND NUMERICAL SIMULATION
No full textBridges play a key role in the development of a nation. They are also the more costly component of a transportation system. Due to our limited resources, economy shall be given due consideration in the design process in addition to safety. To study the behaviour of bridge system, a prototype composite I-beam bridge superstructures consisting of reinforced concrete deck slab supported by four steel girders was selected and designed in accordance with the provisions of AASHTO LRFD Bridge Design Specifications. Mix design of model concrete was carried out to determine proportions of model concrete giving material properties as per requirements of the similitude. ¡1oh reduced-scale model of the selected bridge system was constructed in the laboratory and instrumented with strain gages and strain gage-based displacement transducers. Static loads simulating I4I4SHTO Design Truck were applied to the model bridge through load cells and its response was measured with the help of a data logger. Numerical models of the bridge system were also developed in SAP2000 and their responses were compared with those obtained from the experiments. This paper covers mix design for model concrete, fabrication of loading assembly, and fabrication instrumentation, loading, and response measurement of reduced-scale bridge superstructure model. Responses obtained from the numerical model have also been compared with those obtained from experiment and conclusions and recommendations have been made after thorough analysis of the experimental data
HYDROLOGICAL REGIMES FOR FIVE SUB-CATCHMENTS IN THE HILKOT WATERSHED, DISTRICT MANSEHRA
No full textStream discharge, sediment concentration and nutrient loadings are significantly influenced by land use and management practices in addition to climatic characteristics of Himalayan watersheds. A preliminary study was conducted to relate flows and sediment yields with land management from four sub-catchments and main catchment in Hilkot watershed. Climatic and stream flow data revealed that the bulk of the rainfall occurred during the monsoon i.e. July to September as discharge from all the streams was high. High flows occurred shortly after heavy storms because of the steep gradients and small catchment areas of the streams. High sediment concentrations were confined to critical periods of intense rains and during tillage/planting times when the soil is least protected and most disturbed.The objectives of study were to develop stage-discharge relationship to investigate sediment losses at different discharge levels at five hydro-stations representing different land uses. In the Hilkot watershed annual maximum rainfall ranged from 996 mm to 1458 mm while maximum monthly rainfall recorded was 319 mm. Resulting R2 values showed a strong relationship between stage and discharge. The relationship between stage and discharge was 99%, 97%, 79%, 89% and 95% at hydro-station 1, 2, 3, 4 and 5 respectively. There was a very good and clear relationship between sediment concentration and discharge on all hydro stations. In most of the cases per liter sediment concentration was below 10 grams. Only some events were most destructive when per liter concentration was above 12 mg/I. Hydrograph showed positive skewnes, with recessing time greater than the rising time. Flood reaches from base to peak flow within 3-5 hour and fell very rapidly in the sub-catchments, while it took more time at the outlet of the watershed. Normally base flow in the main stream is 20 to 50 litre/second
ONLINE SOLVING OF ECONOMIC DISPATCH PROBLEM USING NEURAL NETWORK APPROACH AND COMPARING IT WITH CLASSICAL METHOD
No full textIn this study, Iwo methods for solving economic dispatch problems, namely Hopfield neural network and λ iteration method are compared. Three sample of power system with 3, 6 and 20 units have been considered. The time required for CPU, for solving economic dispatch of these two systems has been calculated. It has been shown that for on-line economic dispatch, Hopfleld neural network is more efficient and the time required for convergence is considerably smaller compared to classical methods