Informatics Publishing Limited

K. Kathiresan , K. Sakthivel , N. Rajendran

Abstract

Of the seven species of cyanobacteria isolated from the mangrove sediments, Phormidium tenue exhibited a high ability of fixing nitrogen and hence, this species was tested as biofertilizer to mangrove seedlings of Avicennia marina (Forssk.) Vierh., Ceriops decandra (Griff.) Ding Hou and Aegiceras corniculatum (L.) Blanco. In A. marina, the treatment exhibited higher total biomass by 54.14%, no. of leaves by 48.19% and plant height by 36.83% than in control. In C. decandra, the cyanobacterial treatment enhanced the fresh weight of leaves by 83.12 %. In A. corniculatum, the treatment increased the plant height growth by 10.93 %. Thus the marine cyanobacterium, P. tenue has potential for a biofertilizer to mangroves.

Full Text

     

H. L. Bhadrapur ¹, K. T. Ramachandra ¹, R. H. Naik ², N. Rajendran ²

Affiliations
1 Chitradurga Copper Unit, Chitradurga, IN
2 Geological Survey of India, Bangalore, IN

Abstract

No Abstract.

Full Text

   

D. Purushothaman ¹, J. P. Mohakul ², Asit Saha ³, K. T. Vidyadharan ⁴, N. Rajendran ⁵

Affiliations
1 Geological Survey of India, Opn K&G, K.S. Layout, Bangalore - 560 078, IN
2 Geological Survey of India, Opn Orissa, Nayapalli, Bhubaneswar - 751 012, IN
3 Geological Survey of India, CHQ, 27 JLN Road, Kolkata - 700 016, IN
4 Geological Survey of India, Flat No-310, Block-B, Maharaja Residency, Mangalore -575 001, IN
5 Geological Survey of India, House No-367, Amarjyothi Layut, Domlur, Bangalore - 560 071, IN

Abstract

Geochemical mapping has been carried out in Goa using soil/laterite and stream sediment as media. The geochemical maps for U, Th, Nb and Ta show a conspicuous pattern in the NW part of Goa. The anomaly axis shows a NE-SW trend which is across the formational trend. The nickel and copper distribution around Usgaon area, east of Ponda, have indicated anomalous signature in the northern continuation of the Usgaon ultramafic complex.

Keywords

Soil and Stream Sediment, Geochemical Mapping, Goa.

Full Text

     

N. Rajendran ¹, I. V. Reddy ²

Affiliations
1 Geological Survey of India, Bangalore, IN
2 Geological Survey of India, Hyderabad, IN

Abstract

No Abstract.

Full Text

   

N. Rajendran ¹

Affiliations
1 Department of History, Bharathidasan University, Palkalaiperur Main Campus, Tiruchirappalli-620 024 ,Tamil Nadu, IN

Abstract

Euro-Centric approach in understanding Indian History sans the evolution of Indian civilization, if not, Indian nation is not complete. Again the latter, is a European identity which began with the emergence of the rise of nation-states in Europe. Italian and German nationalism as well as countries which aspired for nationhood in Europe, later the process of decolonization has created this necessity of understanding newly emerged states under nation-state concept.

Full Text

   

S. Nagarajan ¹, N. Rajendran ²

Affiliations
1 Department of Electrical and Electronics Engineering, Jerusalem College of Engineering, Pallikaranai, Chennai – 600100, Tamil Nadu, IN
2 Department of Electrical and Electronics Engineering, Bharath University, Chennai–600073, Tamil Nadu, IN

Abstract

This paper investigates the performance of Trans Z- source inverter (abbreviated as T ZSI) fed induction motor drive under various fault conditions. With development in power electronics and remarkable improvement in control techniques, induction motor has evolved as a variable speed machine. For critical applications, continuous operation of the drive is of paramount importance. However, their performance is restricted by electrical and mechanical faults. When any fault occurs, the phase and line voltages of the inverters get decreased. This leads to reduction of torque and speed of the motor and hence the operation of induction motor is interrupted. This states the importance for fault diagnosis of T Z-Source inverter fed induction motor to analyse the performance of the drive under faulty conditions. The performance of the induction motor under various faults is verified by MATLAB simulation of a 5 Hp induction motor fed by a high performance ZSI and the simulation results are presented. A comparative evaluation of Z-source and T Z-source topologies is done for the same load torque conditions.

Keywords

AC Motor Drives, Fault Diagnosis, T Z-source, Z-source Inverter

Full Text

   

S. Balasubramani ¹, N. Rajendran ²

Affiliations
1 Department of Electrical and Electronics Engineering, Jerusalem College of Engineering, Chennai – 600100, Tamil nadu, IN
2 Department of Electrical and Electronics Engineering, Bharath University, Chennai – 600073, Tamil nadu, IN

Abstract

This paper presents simulation and analysis of twelve pulse rectifier transformer unit configured in series and also in parallel to have higher current capability and reduced harmonics, which creates the current imbalance and hence circulating current can be observed with parallel connection. Balanced current can be achieved with the introduction of Inter Phase Transformer (IPT) while paralleling two six pulse rectifier in rectifier transformer unit. PSCAD is used for performing all the simulations.

Keywords

Circulating Current, Harmonics, Inter Phase Transformer

Full Text

   

N. Rajendran ¹

Affiliations
1 Department of Electrical and Electronics Engineering, Bharath University, Chennai - 600073, Tamil Nadu, IN

Abstract

This paper presents a survey of system studies on electrical machines for variable speed applications. All electrical machines in general are classified based on their unique characteristic features as inductive - interactive type and variable reluctance type machines. In this paper three electrical machines with three different characteristic features are studied and a choice is made as to which machine is best suited for a variable speed application. The subject of System Theory is applied to study the structure of the three machines. Wind energy generation being a typical variable speed application is chosen as the specific application for which the machine is designed. The three machines taken up for study are Induction Machine and Synchronous Machine for inductive - Interactive type and Switched Reluctance Machine for variable reluctance type. Optimization of power generation and increasing the energy efficiency from wind energy by proper choice and design of a machine is the objective of the study.

Keywords

Induction Machines, Switched Reluctance Machines (SRM), Synchronous Machines, Torque Production, Variable Speed Application, Wind Turbine Generator

Full Text

   

M. Tamilzhchelvan ¹, N. Rajendran ²

Affiliations
1 Department of Computer Science, Vivekananda College of Arts and Science for Women, Tiruchengode, Tamil Nadu, IN
2 Principal, Vivekananda College of Arts and Science for Women, Tiruchengode, Tamil Nadu, IN

Abstract

Wireless Sensor Networks are constructed to manage the environment surveillance operations. The sensor devices are deployed with its resource details. The sensing coverage, transmission coverage, battery power and bandwidth levels are considered as resource information. The clusters are formed with bandwidth and coverage details. The cluster head is selected with its capacity levels. The cluster head manage all the nodes comes under the coverage levels.  All the data forwarding operations are carried out through the cluster head nodes.  The data collection for the sensor networks is carried out with three elements. They are Mobile Collector, cluster heads and the sensor nodes. The elements are considered as individual layers.  The data forwarding operations are performed with the distributed Load Balanced Clustering and Dual Data Uploading (LBC-DDU) method.  Cluster construction and data transmission are the main tasks of the scheme. The cluster heads are paired with communication ranges. The mobile collector performs the data collection operations at the polling points. The polling point selection is carried out with the cluster head pair details. Optimal polling point selection scheme is constructed in the Enhanced Distributed Load Balanced Clustering with Dual Data Upload (ELBC-DDU) method. The bandwidth assignment tasks are managed with the channel allotment scheme. Network area verification and rescheduling process is called to manage the spatial coverage optimization for the data collection process. The data gathering scheme increases the network lifetime with minimum query response delay. Network traffic levels are minimized in the data collection framework.

Keywords

No Keywords.

Full Text

     

M.S. Affia Thabassum ¹, M. Mohammed Thaha ¹, N. Rajendran ¹, A. Abudhahir ¹

Affiliations
1 B.S. Abdur Rahman Crescent Institute of Science and Technology, Chennai, IN

Abstract

This paper presents an experimental study conducted on employing Active Learning strategies towards enhancing the attainment of learning outcomes of a course "Linear Control Systems" in the undergraduate (UG) Electrical and Electronics Engineering (EEE) programme. The existing UG programme curriculum is retrofitted into outcome-based curriculum. The Programme Outcomes (POs) for this programme are derived from the Graduate Attributes of Washington Accord (WA). In order to meet the POs, Course Learning Outcomes (CLOs) are written predominantly in the Cognitive (Revised Bloom's taxonomy) and Psychomotor (Dave's taxonomy) domains for lecture-based courses and laboratory courses, respectively and very few are written in Affective (Bloom's taxonomy) domain. In this paper, four CLOs (i) Discuss the various classification of control systems (K₂), (ii) Define the time and frequency response of the system (K₂), (iii) Derive the overall transfer function of the given Block diagram of a system (K₃) and (iv) Derive the overall transfer function of a Signal Flow Graph (SFG) of a system (K3) are considered to measure the effectiveness of active learning methods in attaining the outcome. Active learning methods such as Jigsaw, Think-pair-share and Peer instruction, and traditional lecture-based methods were employed. In addition, ClassComm software with student interactive devices was used to measure the students' learning in the classroom and subsequently the attainment of CLOs. This study compares the effectiveness of active learning methods with the traditional lecture-based instruction method in relation to the attainment of CLOs. The overall analysis results reveal that both instructors and students received the active learning methods very well, and they are very effective in enhancing the attainment of learning outcomes. However, instructors are of the view that the duration of the contact period should be at least two hours.

Keywords

Active Learning, Bloom's Taxonomy, Concept Map, Control Systems, Learning Outcomes.

Full Text