IMPACT : International Journal of Research in Engineering & Technology

1-12

Authors: BENAOUDA O & BENDIABDELLAH A

We present in this paper the simulation results of the speed control of a 3 levels inverter fed induction machine controlled by the Direct Torque Control with application of artificial intelligence techniques both the fuzzy logic (DTC_FL) and the neural network (DTC_NN). A comparative study of these two techniques is also presented to illustrate the merits of each of the techniques on the performance of the 3-levels inverter-/induction machine set.

13-20

Authors: SURIBABU MIRIYALA, B. V. SANKER RAM & K. S. R. ANJANEYULU

Transformer protection is critical issue in power system as the issue lies in the accurate and rapid discrimination of magnetizing inrush current from internal fault current. Artificial neural network has been proposed and has demonstrated the capability of solving the transformer Monitoring and fault detection problem using an inexpensive, reliable, and noninvasive procedure. This paper gives algorithm where arithmetical parameters of detailed d1 level wavelet coefficients of signal are used as an input to the artificial neural network (ANN), which develops in to a original approach for online exposure method to distinguish the magnetizing inrush current and inter-turn fault, and even the location of fault i.e. whether the inter-turn fault lies in primary winding or secondary winding through the use artificial neural-nets (ANNs).

33-44

Authors: ADE ISKANDAR, INDAH YULIASIH, MACHFUD & DAN BAMBANG HARYANTO

The purpose of this study was to determine the physico-chemical, structure and morphology properties of arenga palm sugar blocks and granule and to analyse phenomenon on dry granulation of arenga palm sugar granule. Arenga palm sugar block was prepared by heating sap until temperature of 118 + 2 oC, then it was poured into wood mold and cooled to form solid state (arenga palm sugar block, GAC). The GAC, then was sized reduction and heated at temperature of 70, 80 and 90 oC and every 5 minutes it was stirred and observed its changes until 45th minute to produce arenga palm sugar granule (GAG). The arenga palm sugar granule by wet granulation was used as a control (GAG-control). Physico-chemical of arenga palm sugar block consisted of 10.1% db of moisture content, 3.2%db of reducing sugar and 92.5%db of sucrose was successfully used to produce palm sugar granule by dry granulation. The arenga palm sugar block with its crystallinity of 63-66% incresed its crystalinity into 75% at 20th minute and then deacresed into 72% at the end of the granulation process. Generally, morphological structure of arenga palm sugar block consisted of crystal particles wrapped by a dought-like binder. During granulation, the binder volume deareased due to moisture loss then granule surface was rougher than the initial one. Arenga palm granule by dry granulation had a higher transmittance than wet granulation, and dry granulation did not couse a dramatical change on fungtional group of the product. The granulation process (particle formation) occurs when moisture of the material reached around a multilayer water condition.

51-58

Authors: SUNU MARIAM SAJI & PRABHA C

Shell structures constituted a major component of today’s aerospace, submarine, automotive and other machine or structural elements. They were used in aircraft, spacecraft, rockets, cars, computers, submarines, boats, storage tanks and the roofs of buildings. With the progress of composite materials, shallow shells constructed by composite laminas were extensively used in many fields of modern engineering practices. If external vibrations coincided with natural frequency of the material, resonance and subsequent failure result. Therefore free vibrations leading to the notions of the natural vibration frequency was to be studied. This thesis work focused on the free vibrations of shallow thin composite shells of various shapes, modulus ratios, span-to-thickness ratios, boundary conditions and lay-up sequences. Most of the previous studies on this subject were confined to the classical boundary conditions. So the effect of elastically restrained edges on various shell curvatures including spherical and cylindrical shell was also studied.

65-72

Authors: HASSAN MAMOUD ABUHASSNA, IBRAHIM MOHAMMED HAMAD AMIN & SAMER KHADER ALNAWAJHA

At present, many families have access to computers that help them with their daily activities, such as finding employment and helping children with schoolwork. However, minority families residing in the Gaza Strip in general, do not own home computers. Questions are therefore raised as to whether parents who are unfamiliar with modern culture view computers as important teaching tools for themselves and their children. The present research was conducted to study parents’ perception and young children’s usage of computers. The sample for the study comprised 103 parents, majority of whom responded that computers have helped their children in exploring new technologies. Parental perception of computers was found to be independent of parental occupation and educational achievement. However, the duration of computer use by children varied in accordance with parental perception because parents with more positive perceptions of computers allowed their children to use computers more frequently. The study reveals the need to strengthen and support parental perceptions of the use of computers for children’s learning process. An exploratory study was conducted by analyzing the perceptions of parents whose children were enrolled in a Rafah-Gaza Elementary School. Findings suggest that parents place a high value on computer usage and view it as vital for job success and academic achievement.

81-88

Authors: VANI PRASAD & NIVIN PHILIP

Steel braced frame is one of the structural systems used to resist earthquake loads in structures. Many existing reinforced concrete structures need retrofitting to overcome deficiencies and to resist seismic loads. The use of steel bracing systems for strengthening or retrofitting seismically in adequate reinforced concrete frames is a viable solution for enhancing earthquake resistance. Steel bracing is economical, easy to erect, occupies less space and has flexibility to design for meeting the required strength and stiffness. In the present study multi-storey building, of ten storey with varying length to breadth ratio have been modelled using SAP 2000. SAP 2000 is used to perform linear and nonlinear dynamic analysis. In this study R.C.C. building is modeled and analyzed in three Parts I) Model without bracing and shear wall II) Model with shear wall system III) Model with different bracing system. It was found that steel bracing significantly reduces the lateral drift.

99-110

Authors: I. U. ABHULIMEN & J. I. ACHEBO

Tungsten Inert Gas (TIG) welding was used in this paper in order to achieve good weld qualities and geometry. Desired specifications were used as process parameters for the various joints that were welded for investigation. This justifies the aim of this research which is to develop an Adaptive Neuro-Fuzzy Inference System to predict the properties of Tungsten Inert Gas (TIG) Welded joints of mild steel pipeline joint. During the welding process, current, voltage, shielding gas flow rate and electrode diameter were considered as the process parameters while tensile strength and yield strength were taken as responses. Results show that the best prediction by ANFIS for tensile and yield strength resulted to 508.25 MPa and 387.98 MPa respectively. The ANFIS Model was able to predict tensile and yield strength to maximum error of 0.361. From results, ANFIS has demonstrated the efficiency to predict least values for both tensile and yield at lowest percentage error compared to other systems that were investigated during literature. All the results obtained in this research compared adequately with most results already established in other related researches.

123-134

Authors: ANYATA B. U, AIRIOFOLO I. R, ABHULIMEN I. U, HARUNA I. A

The paper evaluates the potentials for conjunctive use of surface water and groundwater resources to meet the present and future water demand of the University of Benin, Benin City, Edo state, Nigeria. A discrete dynamic model was developed and applied to predict the demand, consumption and net benefit of the conjunctive use of the two sources. In the model, allocations each user was assumed to represent a stage in the sequence of decisions. Three decision variables (x1, x2 and x3), were used to maximize the Net Benefits achieved from assumed discrete quantities S1, S2 and S3. Results from the study show that about 52,000m3 of water could be supplied per day by conjunctive use of surface and groundwater sources. This quantity is 32,500m3/day higher than the present daily demand and can satisfy the demand up to the year 2023. The Net Benefit for using the multi-stage approach was found to be approximately 1.7 times greater than using both sources as a single unit.