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Search Results: 1 - 10 of 200643 matches for " P Pavadai "
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Effectiveness and efficiency of chemical mutagens in cowpea (Vigna unguiculata (L.) Walp)
D Dhanavel, P Pavadai, L Mullainathan, D Mohana, G Raju, M Girija, C Thilagavathi
African Journal of Biotechnology , 2008,
Abstract: A study was undertaken in a cowpea (Vigna unguiculata (L.) Walp.) variety CO 6 to assess the efficiency and effectiveness of chemical mutagens; ethyl methane sulphonate (EMS), diethyl sulphate (DES) and sodium azide (SA). EMS treatments were found highly effective than the other chemicals. Mutagenic effectiveness and efficiency decreased with increase in all mutagenic treatments.
Collaborative Writing: An Integration of Snack Bars and Hi-Five Fingers via Social Media  [PDF]
Yomana Chandran, Christina Jothi Plaindaren, Shamini Pavadai, Melor Md. Yunus
Creative Education (CE) , 2019, DOI: 10.4236/ce.2019.102034
Abstract: English has been the second language taught in schools in Malaysia both in primary and secondary level. Writing skill has been a major part of the English education in the Malaysian schools. However, writing skill is the most difficult skill to master by our Malaysian pupils. Both teachers and pupils find teaching and learning of writing a difficult task to accomplish in the classroom. This can be caused by the lack of teacher-pupil time in school. Teachers do not have time to give feedback to pupils after they have written their essay. Thus, the writing skill was taught out of the classroom contact hours using social media. Therefore, the aim of this action research is to help the Secondary Four pupils use the hi-five Fingers and Snack Bars via social media (Powtoon and Facebook) in their writing to achieve better results. The activities were conducted on 55 participants located in two different schools in Kuantan, Pahang and Johor Bahru, Johor. The study involved two different approaches namely, Product-based and Process-based. The instruments used in this research are pretest, posttest and face-to-face interview. The findings have shown that there is an improvement in pupils’ grades in their writing performance after using the hi-five fingers and snack bars via social media. Thus, it is evident that the usage of hi-five fingers and snack bars via social media in collaborative writing is essential to increase pupils’ writing skill and ability.
Cognitive Semiotics Approach for Communication Development of Language Learners
T. Uvaraj,Mumtaz Begum,Gopi @ Pavadai. K
Theory and Practice in Language Studies , 2011, DOI: 10.4304/tpls.1.10.1420-1423
Abstract: Communication is a two way mode of expression between the encoder and the decoder. The role of communication in the human society is sharing the affective and cognitive attributes to interact. Many times communicated message failed to understand or process by the receiver. Researches proved that lack of skills in communication results to false understanding. The language has four communication skills (Listening, Speaking, Reading and Writing) where the representations are in the forms of signs and symbols. The task of the language teacher is making the learner to construct meaningful semantic and syntactic representations by signs and symbols to enhance the communication competencies. The lack of thematic, vocabulary and grammatical structures insists the language learners to struggle in expressing their thinking in written and spoken form. Thinking depends on the cognition activities, i.e., Representation and Computation. Cognitive is an interdisciplinary study of the mental phenomena involving human mind in terms of perception, memory and language. Semiotics is the study of signs or symbols and Cognitive semiotics studies the relations between signs and language. This paper explores the role of cognition and semiotics in developing better and effective communication in spoken and written forms of Language learners by the Language teachers.
Hybrid Fuzzy Controller Based Frequency Regulation in Restructured Power System  [PDF]
P. Anitha, P. Subburaj
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.76065
Abstract: This paper discusses the implementation of Load Frequency Control (LFC) in restructured power system using Hybrid Fuzzy controller. The formulation of LFC in open energy market is much more challenging; hence it needs an intelligent controller to adapt the changes imposed by the dynamics of restructured bilateral contracts. Fuzzy Logic Control deals well with uncertainty and indistinctness while Particle Swarm Optimization (PSO) is a well-known optimization tool. Abovementioned techniques are combined and called as Hybrid Fuzzy to improve the dynamic performance of the system. Frequency control of restructured system has been achieved by automatic Membership Function (MF) tuned fuzzy logic controller. The parameters defining membership function has been tuned and updated from time to time using Particle Swarm Optimization (PSO). The robustness of the proposed hybrid fuzzy controller has been compared with conventional fuzzy logic controller using performance measures like overshoot and settling time following a step load perturbation. The motivation for using membership function tuning using PSO is to show the behavior of the controller for a wide range of system parameters and load changes. Error based analysis with parametric uncertainties and load changes is tested on a two-area restructured power system.
Integral Performance Criteria Based Analysis of Load Frequency Control in Bilateral Based Market  [PDF]
P. Anitha, P. Subburaj
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.76086
Abstract: Performance index based analysis is made to examine and highlight the effective application of Particle Swarm Optimization (PSO) to optimize the Proportional Integral gains for Load Frequency Control (LFC) in a restructured power system that operates under Bilateral based policy scheme. Various Integral Performance Criteria measures are taken as fitness function in PSO and are compared using overshoot, settling time and frequency and tie-line power deviation following a step load perturbation (SLP). The motivation for using different fitness technique in PSO is to show the behavior of the controller for a wide range of system parameters and load changes. Error based analysis with parametric uncertainties and load changes are tested on a two-area restructured power system. The results of the proposed PSO based controller show the better performance compared to the classical Ziegler-Nichols (Z-N) tuned PI andFuzzy Rule based PI controller.
Projection of the Semi-Axes of the Ellipse of Intersection  [PDF]
P. P. Klein
Applied Mathematics (AM) , 2017, DOI: 10.4236/am.2017.89097
Abstract:
It is well known that the line of intersection of an ellipsoid and a plane is an ellipse (see for instance [1]). In this note the semi-axes of the ellipse of intersection will be projected from 3d space onto a 2d plane. It is shown that the projected semi-axes agree with results of a method used by Bektas [2] and also with results obtained by Schrantz [3].
太古宙绿岩带金矿区域预测准则
д.в.Pундцвист
黄金科学技术 , 1991,
Abstract:
Land Use and Land Cover Changes in a Tropical River Basin: A Case from Bharathapuzha River Basin, Southern India  [PDF]
P. P. Nikhil Raj, P. A. Azeez
Journal of Geographic Information System (JGIS) , 2010, DOI: 10.4236/jgis.2010.24026
Abstract: A study of the spatial and temporal changes in land use and land cover (LULC) was conducted using Remote Sensing and GIS. We analyzed the LULC of Bharathapuzha river basin, south India using multispectral LANDSAT imageries of 1973-2005 time periods. 31% depletion in the natural vegetation cover and 8.7% depletion in wetland agriculture area were seen in the basin during the period. On the other hand the urban spread in the basin increased by 32%. The study highlights the need for a scientific management plan for the sustainability of the river basin, keeping in view the recent climatic anomalies and hydrological conditions of the basin.
Morphometric Analysis of a Tropical Medium River System: A Case from Bharathapuzha River Southern India  [PDF]
P. P. Nikhil Raj, P. A. Azeez
Open Journal of Modern Hydrology (OJMH) , 2012, DOI: 10.4236/ojmh.2012.24011
Abstract: Baseline morphometric information at a sub basin level is essential to develop appropriate strategy for sustainable, socially acceptable, ecologically benign and economically viable development of a river basin. The present study was carried out in one of the less studied Bharathapuzha river basin (BRB), the second longest river in the state of Kerala, India. The annual discharge of the river is 3.94 km3. Nevertheless the basin, which receives about 1828 mm of annual rainfall, in recent years has been facing dearth of water. We used GIS and RS tools to study the morphometric characteristics of the basin. The seventh order main river is formed by several lower order streams forming a dentritic flow pattern. Basin geology, slope and rainfall pattern in the basin determine the morphometric characteristics of the basin. The linear aspects of the basin including stream length ratio and bifurcation ratio indicate the role of relief in the basin while the areal ratios indicate the elongate nature of the basin.
Dielectric Property Studies of Biologically Compatible Brushite Single Crystals Used as Bone Graft Substitute  [PDF]
M. P. Binitha, P. P. Pradyumnan
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2013, DOI: 10.4236/jbnb.2013.42016
Abstract:

The electrical characterization of bone is essential for the better understanding of the role of electrical stimulation in bone remodeling. Calcium Hydrogen Phosphate Dihydrate or brushite (CaHPO4 2H2O) has been used in bone substitution owing to their fast resorption under physiological condition. Brushite is a suitable matrix for osteoconductive bone grafts. In this work, Calcium Hydrogen Phosphate single crystals have been grown by single diffusion gel growth technique. The powder XRD studies revealed the monoclinic structure of the grown crystals. The vibrational analysis of the crystals is done with FTIR spectroscopy and the major functional groups and their assigned vibrations are discussed. The frequency dependence of dielectric constant and ac conductivity at different temperatures have been studied in detail. This study shows decrease in the dielectric constant with the increase in frequency and temperature. The variation of ac conductivity is found to be increasing with frequency and decreasing with temperature.

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