UET Peshawar Publications Site (University of Engineering and Technology, Peshawar)
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INFILTRATION RATE OF SOIL OF MALAKANDHER FARM, N.W.F.P. AGRICULTURAL UNIVERSITY PESHAWAR AND ITS CORRELATION WITH SOME PROPERTIES OF SOIL
No full textThe water intake characteristics of the soil of Malakandher Farm, NWFP Agricultural University, Peshawar were determined by conducting infiltration tests at five sites using cylinder infiltrometer method. Five cylinders were installed at each site. The values of average accumulative intake ranged from 6.0 to 13.20 cm for four hours and 1.5 to 3.3 cm. per hour. The average intake rate for five sites was 2.2 cm per hour and thus the soil was of moderate intake characteristics. The texture of the soil was silty clay loam and clay loam with organic matter content of 0.14 to 0.27 percent. The intake of water showed a significant negative correlation (r=-o.97) with antecedent moisture content and a non-significant positive correlation (r=+ 0.34) with organic matter content. The infiltration rate could be increased by addition of adequate organic manures and proper managment practices
STABILIZATION OF AN A.C. LINK BY A PARALLEL C.C. LINK
No full textBecause of the numerous advantages of H.V.D.C. transmission over H.V.A.C. transmission tremendous amount of work has been done in developing H.V.D.C. within existing H.V.A.C. systems in different part of the world. One of the advantages of the A.C.-D.C. parallel operated system is to be able to increase the transient stability limit by exercising control of the D.C. system. Basic equation of transient stability phenomena on A.C.-D.C. parallel operated systems are investigated.A D.C. parallel link offers the possibility of a quick acting extra power control which helps to improve the transient stability of A.C. system in critical situation. In this paper an attempt has been made to show in general terms the application of equal area criterion for the determination of transient stability and that how the stability can be improve by having a D.C. link in parallel with existing A.C. line
TRACTOR TIRE COMPACTION — A DRAWBACK IN MECHANIZED FARMING
No full textEffect of tractor tire compaction was studied on a silt loam soil both under wet and dry soil conditions. Compaction treatments included five, ten and fifteen passes of a Fiat-480 tractor over the same soil strip, no passes being control treatment. It was concluded that wet soil was more susceptible to compaction. Only five tractor passes on wet soil were found as detrimental as ten and fifteen passes
EFFECT OF HIGH TEMPERATURE ON COMPRESSIVE STRENGTH OF CONCRETE
No full textTemperature whether it is very high or very low has a profound effect on the strength of concrete. Laboratory studies were conducted to observe the effect of high temperature on the compressive strength of concrete, which showed that with increase of temperature a decrease in the compressive strength of concrete occurs
REDUCTION IN THE FLOW RATE AS A BLOCKED ORIFICE EFFECT AND AS A CHANGE IN FRICTION
No full textThe reduction in the discharge rate resulting from the addition of large particles of lime stone chips to sand, was found to be independent of the lime particle size at constant mass fraction of lime stone. This suggests that the blocked orifice effect based on statistical annular free space idea of Brown and Richards does not account for the observed reduction in flow rates. This when interpreted as a change in the internal angle of friction by relating measured discharge rates to Williams equation, the apparent angle of internal friction increased from 36.5° for sand to 46° and 52° for the two bunkers of semi-included angles 20° and 30° respectively at 50 mass percent lime stone. These different values suggest this is not a complete explanation. It is possible the continuum equation of motion is not applicable to flows of material with large rigid particles
FLOOD ROUTING OF LOWER INDUS RIVER
No full textFlood discharge data River Indus at Gudu and Sukkur Barrages for the years 1975 and 1976 were collected for the flood routing analysis. Characteristic curves based on simple Hydrologic method were computed and drawn from the 1975 year flood discharge data. The 1976 outflow at Sukkur Barrage was estimated from the 1976 year inflow data at Gudu Barrage and was compared with corresponding observed outflow at Sukkur Barrage, and the results thus obtained are found to be satisfactory for practical purposes. The minimum and maximum difference between estimated and observed outflow at Sukkur Barrage are of the order of 2.6% and 16.2% respectively
AN INTRODUCTION TO ENGINEERING FRACTURE MECHANICS
No full textIn the conventional design of engineering structures the associated failures are numerous, some of them are described in this paper. Most of these are brittle fracture and fatigue failures in structures. The Fracture Mechanics provides engineers means of designing against fracture and controlling the fatigue failures in structures. Hence the fundamental understanding of Fracture Mechanics is very essential. The importance of stress-intensity factor is highlighted. The theory of Fracture Mechanics can be used to analyze the behaviour of a structure throughout its entire life. The Fracture Mechanics Design is discussed briefly. Fatigue crack initiation and propagation are also discussed
SUPPLY VOTLAGE DISTORTION NEEDS DUE ATTENTION OF ELECTRONIC POWER SUPPLIERS AND CONSUMERS
No full textMajor portion of this paper is review of the original works done by some authors. The paper discusses the causes, effects and methods of compensation of supply voltage distortion in power distribution systems. Effects of Harmonics on induction motor performance are discussed separately. It is also shown that certain measuring instruments which are basically either ‘peak’ or ‘average' would give errors while measuring non sinusoidal waves. Hence a ‘rue rms’ instrument must be used if accurate reading of some non-sinusoidal wave is desired. In the end a brief description of power factor and its compensation in non-sinusoidal circuits is given
DEVELOPMENT OF LOCAL ENERGY CENTRES THROUGH GOVERNMENT - COMMUNITY - UNIVERSITY COOPERATION
No full textA review of the basic energy needs and energy options is presented. The need for the development of small-scale energy units with the participation of local community is emphasised. A brief description of small scale energy centres established by Appropriate Technology Development Organization, in collaboration with University of Engineering, Peshawar, is also presented. The role played by different agencies in the implementation of this programme and improvement of socioeconomic conditions in rural areas is discussed
MINIATURE VIBRATION SHAKER FOR MEMS-SCALE VIBRATION-BASED ENERGY HARVESTERS APPLICATION
No full textThis paper describes the design and fabrication of miniature electromagnetic-type vibration shaker for generating sinusoidal vibrations. Conventional machining is used to produce different parts of the vibration shaker. The shaker’s table is supported by zig-zag planar beams and a copper wound coil is contained at the lower portion of the shaker’s table. Alternating magnetic field of the wound coil and the magnetic field of the permanent magnet generates a sinusoidal force that causes the shaker’s table to vibrate at the frequency of input electrical signal to the shaker. Modal analysis of the suspension system performed in COMSOL Multiphysics®, indicates that in the first mode of the vibration the shaker’s table is perfectly moving up and down. The developed vibration shaker is characterized for sinusoidal electrical input signal. At different gain levels of the power amplifier, the shaker is subjected to a frequency sweep from 1 Hz to 1 kHz. At resonant frequency of 60 Hz, acceleration amplitudes of 5, 10, 18, 20 g are produced at gain levels of -60, -55, -50 and -48 dB respectively. Beyond 200 Hz almost constant acceleration levels of 1.8, 1.3, 0.9 and 0.7 g are obtained at -48, -50, -55 and -60 dB respectively. Current drawn and power delivered are maximum, when the shaker is operated at the resonant frequency. Operating on the resonant frequency of 60 Hz, a maximum power of 0.6 W is delivered to the shaker at -48 dB gain level