UET Peshawar Publications Site (University of Engineering and Technology, Peshawar)
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An Efficient Patch Antenna with Improved Bandwidth for Future Applications
No full textIn this article the inherent demerits of the patch antenna like low bandwidth and low efficiency have been addressed. A wideband and efficient microstrip patch antenna of 9×18mm2 size has been proposed for satellite and other fields of communications in future. The size of the antenna is very small and will definitely require a small space in the electronic equipment. An efficient substrate material was employed in the antenna that is known as Preperm L-450. Dielectric constant of this mentioned material is 4.4 and its height or thickness is 1.64mm. Different methods were engaged to expand its bandwidth from 9.07GHz to 13.13GHz. The reflection coefficient of -45dB at the central frequency, a gain of 7dBi and total efficiency of 0.99 have been demonstrated by this proposed design of the patch antenna. This novel structured wide band and high efficient antenna can be engaged in various types of wireless applications in near future
Evaluating the Social Aspect of Sustainable Construction for Pakistan via Analytical Hierarchy Process
No full textSustainability, Sustainable Development and Sustainable Construction have no universal definition. In the past decade researchers have presented models for sustainability and identified factors for different countries. Most of the definition related to sustainability, sustainable development, and sustainable construction relies on economy, environment and society. This makes social aspect (society) to be of prime importance. This paper focuses on the social aspects of the sustainable construction. Most of the sustainability studies are carried out through questionnaire or interviews. Similarly, this papers also uses the questionnaire for data collection. The collected data is analyzed with Analytical Hierarchy Process (AHP). The pair wise comparison (From To) charts are generated for mean, mode and median independently. The analysis on the basis of mean, mode and median are also carried out independently. The factors are ranked on the basis of their Eigen values obtained from AHP analysis
An investigation of heavy and trace elements in coal deposits of Makarwal Pakistan and their possible impacts on surrounding water-case study
No full textIn this research, coal samples from different locations of Makarwal (Pakistan) were investigated for the presence of heavy and trace metals. The coal samples used under study were: Makarwal section-A (Mk-A), Makarwal section-B (Mk-B), Kurd section C (Kr-c), Makarwal section D (Mk-D) and Gula-khel section E (Gk-E). It was observed that, these coalfields contain arsenic (As) ranging from 3.0–16.34mg/kg, cadmium (Cd) 2.23–4.61 mg/kg, Co 22.1–29.3 mg/kg, Cr 113.1–288.2 mg/kg, Cu 8.53–23.2 mg/kg, Fe 1133–10813 mg/kg, Ni 44.35–148.8 mg/kg, Pb 18.49–46.25 mg/kg and Zn 25–242 mg/kg. Moreover, the Mk-D coal samples had the highest concentration of As, Cd, Co, Cr and Ni. However, the coal samples from Mk-C had higher contents of Cu and Pb. Whereas, Fe was abundant in Mk-B coal samples. These results can be used as a helping tool for the prediction of environmental risks associated with coal mining in Makarwal area. Further, the water samples of Makarwal area were also analyzed and found to be contaminated with heavy metal pollutants
Finite Element Analysis of the Real Life Loadings on the Ti-27Nb Hip Bone Implant
No full textBone is an important part of all vertebrates. It support the body and homes the marrow. The bone may be damaged by number of reasons. The objective of this paper is the investigation of the real life loadings on the Ti-27nb hip bone implant using FEA. The model of the implant was created using CREO PARAMETRIC software. Two weight categories 75Kg and 100 Kg with four different daily life activities stand up, sit down, knee bend and walking were considered in this study. The FEA analysis was performed using commercial FEA software ANSYS. The implant model was meshed using tetrahedral element type. The simulation result show that maximum stress occurs at the neck of the implant for each loading case. The stress level was approximately equal to the strength of Ti-27Nb in 100 Kg, stand up position case
DESIGN OF MINITURISED MIMO ANTENNA WITH W-LAN BAND NOTCHED FOR ULTRA WIDE BAND (UWB) APPLICATIONS
No full textA miniaturized Multi-input Multi-output (MIMO) antenna is proposed for Ultra-wideband (UWB) applications having capability to mitigate interference with the WLAN (5.15GHZ-5.85GHZ) operating band. A ‘spider’ shape structure is etched on the ground as a decoupling structure to obtain impedance matching as well as desired isolation. W-LAN notched band in the entire Ultra Wide band is obtained by etching a couple of straight line on the ground plane. A very compact UWB-MIMO antenna with overall dimension of 20×20 mm2 has been proposed which is smaller than most of other MIMO antennas designed for UWB. Impedance bandwidth for the proposed MIMO antenna is 2.9-11.1GHz with -10dB refection coefficient and isolation better than -16.5dB in the total Ultra Wide band is achieved
APPLICATIONS OF HORIZONTAL DRILLING TECHNOLOGY IN SAUDI OIL FIELDS
No full textThe technology of drilling and production of horizontal wells is probably one of the most significant breakthrough in the oil and gas industry of the eighties. The continuous improvement of hardware equipment made horizontal drilling cost-effective technique for developing reserves, improving productivity and recovery in oil and gas reservoir.This paper is devoted to Saudi experience in horizontal drilling. The last years have been an exciting period for those who believed in horizontal drilling applicability in Saudi Arabia. At the end of the year 1997 more than 150 horizontal wells have been drilled in Saudi oil fields. There are four major horizontal well applications identified in Saudi Arabia oil fields; 1) Control of coning in relatively thin remaining oil column area, 2) improving sweep efficiency of water flooding program, 3) Improving productivity rate in thin/tight reservoirs and 4) Saving in total development costs in conjunction with previous three applications.This paper presents the major areas of application of horizontal well and more specifically the objectives of applying horizontal drilling in different Saudi oil fields and the world and the world horizontal drilling activities along with the Saudi experience will be covered. This paper surveys different field examples to show the application trends of horizontal well technology in both offshore and onshore oil fields. The main objective of this survey is to demonstrate the performance improvement of these oil fields after the application of horizontal well technology
THE COMPLEXES OF URBANIZATION IN SOUTH ASIA: ASSESSMENTS, IMPACTS, PLANS AND PROSPECTS FOR INTERNATIONAL COLLABORATION
No full textCentralized planning policies, lack of democratic participation of the masses in socio-economic activities at community levels, poor legislation and growing share of defense in the annual budget, have not only created rural-urban bias, uneven and unsustainable development but have also generated the problems of mass poverty, unemployment, scarcity of socio-economic services, pollution of water, air and land, and also rising slums and squatter in urban localities, affecting adversely human development in South Asian Countries
INFLUENCE OF LARGE AMPLITUDE ON FREE FLEXURAL VIBRATION OF ISOTROPIC PLATES
No full textThis research is concerned with an analytical and experimental investigation of free flexural large amplitude vibration of rectangular plates valid for an isotropic material obeying Hooke‘s law. This theory, which may be considered the dynamic analog of the Van Karman plate theory, is applied to the study of free flexural vibrations of rectangular isotropic plates with all edges simply supported and all edges rigidly clamped. The nonlinear equations are solved approximately by employing Galerkin‘s procedure. The numerical calculations for multimode vibrations are performed for both types of boundary conditions. The influence of large amplitudes on the frequencies of free vibrations are estimated. Frequencies of free flexural vibrations are then found experimentally for small amplitudes with the help of digital frequency analyzer. At the end, analytical and experimental results are compared which shows close agreement with each other
EVALUATION OF MARBLE SLURRY WASTE FOR PREPARATION OF COMMERCIAL GRADE CEMENT
No full textMarble processing is generating a large amount of slurry waste which poses serious impact on the environment. This study was conducted with the objective to demonstrate the practicability of using marble slurry wastes in the manufacturing of cement on commercial scale. Waste marble slurry was obtained from marble processing units and compares it with the calcium carbonate used in the cement industry by analyzing it for physical and chemical characteristics. Cement was made in the laboratory according to standard formulation. Commercial brand available in the market was used as control for product comparison. Physical and chemical properties of both cements and mechanical properties of their concrete specimens were tested according to American Society for Testing Materials (ASTM) standards. The test results showed that the cement prepared from marble slurry waste have similar properties like commercial brand. It was concluded that marble slurry can be used as a substitute of calcium carbonate raw-material in the manufacturing of commercial cement.
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DEVELOPMENT OF A POWER MANAGEMENT CIRCUIT FOR MICROENERGY HARVESTERS
No full textThis work reports on the development a power management circuit (PMC) for micro energy harvesters. The circuit is design to regulate the power between three different power sources for the operation of a wireless sensor nodes (WSNs). The main components of the circuit are resistors (carbon film), capacitors (electrolytic), inductors (ferric bead, axial leaded), and a DC voltage regulators (TPS62100DRC-BRR). The layout of the circuit is patterned on a printed circuit board (PCB) using PCB fabrication technology. To the circuit three different types of sources (DC power source, rectified AC voltage and a solar energy harvester) are connected and the output regulated voltage provided by the PMC is measured and analyzed. At different input voltage levels (0.5 to 5.5 V) the circuit successfully regulated to almost a uniform output voltage (2.75 to 2.96 V). With the circuit using a DC power source and a solar (solar cell) energy harvester a super capacitor is charged to a voltage of 2.75 and 2.05 V in 180 s and 840 s respectively. Beyond 100 Ω load resistance the PMC regulated a constant output current of 180 mA. Moreover, beyond 100 Ω load resistance the power consumption of the circuit is almost steady for different input voltage levels. The average consumption of the developed PMC is about 70 m