Archives-June...  

The paper presents the modeling, simulation & analysis of Speed Controller for a Brushless DC Motor. Performance comparison between a position sensor and sensorless based speed control is also presented in the paper. Hall effect Sensors have been used for position sensing and back emf based method has been used for determining the position of rotor in position sensorless scheme. The speed controller has been implemented by incorporating PI controller and hysteresis current controller in MATLAB Simulink. Hysteresis current controller was used to generate PWM pulses for inverter switches. IGBT based inverter was used for conversion of DC power to AC power.

Skill development is an important driver to address poverty reduction by improving employability, productivity and helping sustainable enterprise development and inclusive growth. It facilitates a cycle of high productivity, increased employment opportunities, income growth and development. However, this is just one factor among many affecting the productivity whose measurement differs for individuals, enterprise and economy. The increase in productivity could be due to availability of skilled & healthy manpower; technological up gradation and innovative practices; and sound macroeconomic strategies. The manifestations of improved productivity can be in the form of improvement in real gross domestic product (economy), increased profit (enterprises) and higher wages (workers). In this study, an attempt has been made to conceptually analyse the skill development process in India and the agencies involved in its promotion.

In this paper we have investigated the steady plane poiseuille flow of viscous incompressible fluid between two porous parallel plates in magnetic field. We have studied the velocity, average velocity, shearing stress, skin frictions, the volumetric flow, drag coefficients and stream lines.

This paper is the study on setting up a solar PV system plant and rooftop system in the northern hemisphere of India. It includes brief explanation on structure, calculations based on the approximated data collected from the 5MW plant and maintenance required to get the maximum efficiency of the plant. However many locations around the world have years of weather records that will provide average data which is sufficient for designing a PV systems and if no long term data exists for the chosen site, in that case the availability of sun light and the amount of sunshine can also be estimated with the help of available equipments.

This study was to investigate perceptions of selected International Islamic University Malaysia (IIUM) students’ regarding the definition and manifestation of Comprehensive Excellence in the university’s vision and mission statement of Integration, Internationalization, Islamization, and Comprehensive Excellence (Triple ICE) – irrespective of gender, nationality or academic achievement. Individual interview sessions lasting between 45 minutes to 55 minutes were conducted on selected IIUM students at separate venues and times. Each dimension was transcribed from the interview questions and decoded into a template. Main ideas were extracted from the template to answer the research questions within the purpose of the study. Two selected co-raters were identified to evaluate the main ideas of the researcher’s template in order to assure its reliability and validity. A percentage range of 96% to 100% showed that the items were highly reliable and valid. The results showed that Comprehensive Excellence was understood by a selected group of students only, thus more students need to be exposed to the conception of Comprehensive Excellence and other components of Triple ICE of the International Islamic University Malaysia (IIUM). This study may aid IIUM to compete and excel with other universities – locally and/or internationally as well as to prepare employable and marketable graduates.

In the present communication novel tris(hetroaryl)bisazo dyes were synthesized by the coupling of various heterocyclic diazonium salt with 1-ethyl-6-hydroxy-4-methyl-2-oxo-5-((4-phenylthiazol-2-yl)diazenyl)-1,2-dihydropyridine-3-carbonitrile. The later compound was synthesized by a new procedure for the synthesis of well known azo pyridone dyes from 2-cyano-N-ethylacetamide, ethyl-3-oxobutanoate and 4-aryl-2-aminothaizole. Structural confirmation of all the synthesized compounds have been accomplished by UV-Visible, FT-IR, 1H-NMR,13C-NMR and mass spectroscopic techniques. Solvent effects on the visible absorption spectra of the dyes were evaluated. The color of the dyes is discussed with respect to the nature of the heterocyclic ring and substituent present therein. All these dyes were applied as disperse dyes on to polyester fabrics and their fastness properties were evaluated.

The research on Study Habits and Students Academic Performance in English Language among Public Secondary Schools in Oron Local Government Area of Akwa Ibom State was conducted in order to seek solution to the increasing nature of poor academic performance of students in English Language among Public Secondary Schools in Oron Local Government Area. Four variables were adopted to include participation in tutorial classes, attendance to classes, use of library and personal time table, which aimed at finding the relationship between each of those variables with academic performance of students. Four research questions and four research hypotheses were set. The related theories of learning used are connectionism, cognitive and psychological theories of learning. The population of study comprises all the 3 Public Secondary Schools in Oron Local Government Area. The instrument used for the study was Study Habit and Academic Performance Questionnaire (SHAPQ) which has a reliability coefficient of 0.99 using Pearson Product Moment Correlation (PPMC) at P<.05 level of significance. The sample size was 200 students and data collected from the respondents were analyzed using PPMC with the degree of freedom of 198 at 0.05 level of significance. The result of data collections were drawn that: students should participate in tutorial classes, attend classes, use the library and should have a personal time table to improve academically. In conclusion, students should develop good study habits to achieve better academically and otherwise.

We report a case of a young patients with a residual mass surgery of a testicular cancer which was outside the recommended territories. This surgery was justified by the persistence of mass after chemotherapy , and more than a year after surgery our patient presents good evolution both clinical , biological and radiological .

A series containing twelve substituted styryl 2-pyrrolyl ketones have been synthesized by solvent free fly-ash:H2SO4 solid acid catalysed crossed aldol condensation. These chalcones were characterized by their physical constants and spectral data. The IR and NMR spectral frequencies of ?COs-cis and s-trans, deformation modes of ?CHip, op, CH=CHop and C=Cop(cm-1), ?H and ?C of ?, ? and CO(ppm) and the electrochemical reduction potential and currents of carbonyl and vinyl groups of synthesized chalcones were correlated with Hammett substituent constants, F and R parameters. From the results of statistical analyses the effects of substituents on the group frequencies and electrochemical functionalities have been discussed. The antimicrobial activities of all chalcones have been studied using Bauer-Kirby method.

In recent years with the advent of technology in people’s life, the use of audio visual material to assist learners in their language learning experience especially EFL learning contexts has been integrated into the curriculum design in many countries. The use of video as an audio-visual aid in foreign language classrooms with the emphasis on communicative language teaching has attracted the attention of language teachers, SLA researchers as well as learners and it is apparent that the use of such useful learning tool can be a great help for language learning. In this study the effect of frequent exposure to audio- visual material on Iranian EFL learner shave been investigated. In order to conduct the study 40 Iranian intermediate students have been selected out of a pool of 200 based on their result in a placement test. The selected participants were randomly assigned into two groups of experimental and control each containing 20 learners. The listening ability of the participants were tested by a pre-test before start of the treatment and no significant difference have been observed. After a period of two month in which the experimental group received treatment of exposure to authentic audio visual material a round of post-test was administrated and the scores obtained from two groups was compared using a t-test. It was observed that the experimental group who have received the treatment achieved significantly better scores. It was concluded that frequent exposure to audio visual material has a positive impact on improvement of learners’ listening ability.