Qualification: 
Ph.D, MSc
Email: 
pp_nikhilraj@cb.amrita.edu

Dr. P. P. Nikhil Raj. currently serves as Assistant Professor at Amrita Centre for Sustainable Future, Coimbatore Campus.

Publications

Publication Type: Book Chapter

Year of Publication Publication Type Title

2015

Book Chapter

Dr. P. P. Nikhil Raj and Azeez, P. A., “Factors Influencing the Runoff Trend in a Medium Sized River Basin in the Western Ghats, India”, in Environmental Management of River Basin Ecosystems, Springer International Publishing, 2015, pp. 111–125.[Abstract]


The present study examines the trends in the annual runoff of a tropical river basin Bharathapuzha, a medium sized river in southern India under the influences of anthropogenic pressures and climate change. The examination of the temporal trends in the rainfall, temperature and river runoff was done using historical datasets. It was supplemented with the data on the land use/land cover (LU/LC) change in the basin based on the LANDSAT TM data. By using a multiple regression model, the influential factors determining the river discharge were identified. The results show that while the rainfall influences the runoff positively, new water bodies, dams and other diversions in the fluvial setup in the basin influence the river runoff negatively. More »»

2009

Book Chapter

P. A. Azeez, Chandra, R., Bhupathy, S., and Dr. P. P. Nikhil Raj, “Conservation of Kottuli Wetlands, Calicut, Kerala.”, 2009.

Publication Type: Patent

Year of Publication Publication Type Title

2013

Patent

B. Choudhary, Ahmed, N., Dr. P. P. Nikhil Raj, Kumar, A., and Jindal, S., “Quick action for performing frequent tasks on a mobile device”, 2013.[Abstract]


A shortcut is created that groups and sequences actions to perform a task. A user may record actions both within an application and outside of an application to perform the task. For example, a user may record launching an application, accessing an item within the application, and performing one or more actions that involve the item. An Application Programming Interface (API) may be used by one or more applications to specify recordable actions that are associated with the application. For example, an application may specify that configuration settings for the application are not recordable while other user actions are recordable. After recording the actions for the task, a shortcut is created. The shortcut may be accessible from a home display of a mobile device (e.g. a start screen of a smart phone) and/or some other accessible location.

More »»

Publication Type: Journal Article

Year of Publication Publication Type Title

2013

Journal Article

A. Datta-Roy, Mohapatra, P. P., Dutta, S. K., Giri, V. B., Veerappan, D., Maddock, S. T., Raj, P., Agarwal, I., Karanth, P., and Dr. P. P. Nikhil Raj, “A long-lost relic from the Eastern Ghats: Morphology, distribution and habitat of Sepsophis punctatus Beddome, 1870 (Squamata: Scincidae)”, Zootaxa, vol. 3670, pp. 055–062, 2013.

2012

Journal Article

Dr. P. P. Nikhil Raj and Azeez, P. A., “Trend analysis of rainfall in Bharathapuzha River basin, Kerala, India”, International Journal of Climatology, vol. 32, pp. 533–539, 2012.[Abstract]


Knowing the variations in the general rainfall pattern of a river basin is vital to understanding the hydrological cycle and water budget of the basin. The present study examined the general rainfall pattern in Bharathapuzha River basin of Malabar coast of Kerala, using monthly rainfall data for 34 years collected from 28 rain gauge stations. We used Mann-Kendal's rank correlation statistics and wavelet analysis to examine the trend of rainfall. The annual rainfall, southwest monsoon, and pre-monsoon rainfall of the basin shows a significant decrement towards the later years of the study. We assume that the global climate and the local environmental changes are the chief factors for the variation. Copyright © 2010 Royal Meteorological Society More »»

2012

Journal Article

P. R. Arun, Murugesan, M., Dr. P. P. Nikhil Raj, and Azeez, P. A., “REPORT ON BASELINE STATUS OF THE BIOLOGICAL ENVIRONMENT AROUND THE PROPOSED NUCLEAR POWER PARK AT MITHIVIRDI, BHAVNAGAR, GUJARAT, OF M/S. NUCLEAR POWER CORPORATION Ltd.”, 2012.

2012

Journal Article

P. Raj, Vasudevan, K., Vasudevan, D., Sharma, R., Singh, S., Aggarwal, R. K., Dutta, S. K., and Dr. P. P. Nikhil Raj, “Larval morphology and ontogeny of Nasikabatrachus sahyadrensis Biju & Bossuyt, 2003 (Anura, Nasikabatrachidae) from Western Ghats, India”, Zootaxa, vol. 3510, pp. 65–76, 2012.

2011

Journal Article

Dr. P. P. Nikhil Raj and Azeez, P. A., “Temperature rise in the Bharathapuzha river basin, southern India”, Current Science, vol. 101, p. 492, 2011.

2011

Journal Article

Dr. P. P. Nikhil Raj, Azeez, P. A., and A Hussain, S., “Performance evaluation of an irrigation project with reference to its irrigation objectives”, African Journal of Agricultural Research, vol. 6, pp. 2472–2478, 2011.[Abstract]


During the late 1950s in India several river valley projects were started for irrigation and power generation. One such project is the Malampuzha project, the largest irrigation project in Kerala state. The project started functioning in 1956. It was expected to cater the irrigation need of 22554 Ha of rice paddy in Palakkad district. The present study is an attempt to evaluate the project by focussing on its original irrigation objectives. Data from the detailed project report (DPR) and those generated from field surveys using a custom made questionnaire was used for the study. The cost – benefit analysis conducted on Malampuzha irrigation project, with reference to its declared irrigation objectives, shows that the performance of the project is not satisfactory. More »»

2011

Journal Article

P. R. Arun, Azeez, P. A., Murugesan, M., and Dr. P. P. Nikhil Raj, “IMPACT ASSESSMENT OF LNG TERMINAL AUGMENTATION PROJECT by M/s PLL ON THE TERRESTRIAL FLORA AND FAUNA AT PUTHUVYPEEN, KERALA”, 2011.

2011

Journal Article

P. R. Arun, Murugesan, M., and Dr. P. P. Nikhil Raj, “Impacts of proposed Seismic survey operations on the Avifauna and Wildlife of Reserve Forest areas of KG Basin Project of Oil India Ltd.”, 2011.

2011

Journal Article

P. Raj, Deepak, V., Vasudevan, K., and Dr. P. P. Nikhil Raj, “Monitoring of breeding in Nasikabatrachus sahyadrensis (Anura: Nasikabatrachidae) in the southern Western Ghats, India”, Herpetology Notes, vol. 4, pp. 11–16, 2011.[Abstract]


The breeding of Nasikabatrachus sahyadrensis was monitored for three consecutive years (2007- 2009) in an evergreen forest patch in the Anamalai tiger reserve, Western Ghats. The relationship between climatic variables and pattern of breeding was studied. Few anurans from this region have a reproductive mode analogous to the one observed in N. sahyadrensis. The phenology of calling activity and reproduction of N. sahyadrensis is probably correlated with the onset of south west monsoonal rainfall. More »»

2010

Journal Article

Dr. P. P. Nikhil Raj and Azeez, P. A., “Changing rainfall in the Palakkad plains of South India”, Atmósfera, vol. 23, pp. 75–82, 2010.

2010

Journal Article

Dr. P. P. Nikhil Raj and Azeez, P. A., “Land use and land cover changes in a tropical river basin: a case from Bharathapuzha River Basin, Southern India”, Journal of Geographic Information System, vol. 2, p. 185, 2010.[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. More »»

2010

Journal Article

Dr. P. P. Nikhil Raj, Ranjini, J., Dhanya, R., Subramanian, J., Azeez, P. A., and Bhupathy, S., “Consolidated checklist of birds in the Pallikaranai Wetlands, Chennai, India”, Journal of Threatened Taxa, vol. 2, pp. 1114–1118, 2010.[Abstract]


We documented the avifauna of Pallikaranai marshes located near the Chennai metropolis in southern India. In total, 110 species of migratory and resident birds including those listed in the Red Data Book were recorded. Presently the wetland is facing severe threats from various anthropogenic pressures caused due to unplanned waste disposal and land conversion. The high population of migratory as well as wetland birds in this area emphasizes the urgent need of conservation of this urban wetland. More »»

2010

Journal Article

P. A. Azeez, Dr. P. P. Nikhil Raj, and Murugesan, M., “Rapid EIA of the Indiabased Neutrino Observatory Project, Bodi West Hills, Theni, Tamil Nadu.”, 2010.

2010

Journal Article

Dr. P. P. Nikhil Raj and Azeez, P. A., “Public on Conserving an Urban Wetland: A Case from Kerala, India”, International Journal of Social Ecology and Sustainable Development (IJSESD), vol. 1, pp. 14–19, 2010.

2010

Journal Article

Dr. P. P. Nikhil Raj and Azeez, P. A., “Deteriorating health status of Kerala state, India: An environmental and cultural diagnosis”, Seronica, p. 23, 2010.

2009

Journal Article

Dr. P. P. Nikhil Raj and Azeez, P. A., “Spatial and temporal variation in surface water chemistry of a tropical river, the river Bharathapuzha, India”, Current science, vol. 96, pp. 245–251, 2009.[Abstract]


The study examines the spatiotemporal variation in water quality and quantity of Bharathapuzha river basin using multivariate statistical analysis tools. The sub-basins varied notably in terms of river discharge, elemental concentration as well as elemental load. It was found that in basins that are more disturbed, monsoonal discharge was much higher than the discharges in other seasons, while the slightly disturbed basin had consistent level of discharge throughout the season. Changes in land use and the impact of dams are major reasons for the spatiotemporal variations in the surface water chemistry of the river. More »»

2009

Journal Article

Dr. P. P. Nikhil Raj and Azeez, P. A., “Real estate and agricultural wetlands in Kerala”, Economic and Political Weekly, pp. 63–66, 2009.[Abstract]


The "rice culture" of Kerala is fast vanishing due to the increasing diversion of the land for non-agricultural purposes. The real estate sector is gradually swallowing up the rice cultivating low-lying wetlands. This paper attempts to examine the growth of real estate business and consequent destruction of the wetland ecosystems in the state. More »»

2009

Journal Article

Dr. P. P. Nikhil Raj and PA, A., “The Shrinking Rice Paddies Of Kerala”, THE INDIA ECONOMY REVIEW 2009, vol. 6, pp. 176–183, 2009.

2009

Journal Article

Dr. P. P. Nikhil Raj and Azeez, P. A., “The general rainfall trend using the historical data: a case from the Palakkad plains of Kerala.”, 2009.

2009

Journal Article

Dr. P. P. Nikhil Raj and Azeez, P. A., “Development of a city and disappearing urban water bodies; a case from Palakkad city of Kerala, India”, Arc India news magazine, vol. 3, pp. 20–12, 2009.

2009

Journal Article

Dr. P. P. Nikhil Raj, Ranjini, J., Dhanaya, R., and Azeez, P. A., “Energy Scenario and environmental implication: an over view of Kerala, India.”, Research Journal on Climate, Environment and Energy, vol. 1, pp. 60–76, 2009.

2008

Journal Article

P. A. Azeez, Bhupathy, S., Ranjini, J., Dhanya, R., and Dr. P. P. Nikhil Raj, “Management Plan for the Eco-restoration of Pallikaranai Reserve Forest”, Report submitted to SACON, pp. 1–62, 2008.[Abstract]


A rapid investigation was undertaken with the scope to examine the present state of Pallikaranai wetland to develop an Ecological Management Plan (EMP) for the  5 portion declared as protected by the government of Tamil Nadu to conserve it. The primary aim of the present EMP is to restore the wetland to provide habitats for various species inhabiting or visiting the area and also to develop it as a demonstration / education site to inculcate the values and importance of ecological conservation in target groups such as students and public at large. The major objectives were as follows:  Document the baseline characteristics of the Pallikaranai marshes.  Examine various threats.  Brief about various action taken for conservation and,  Develop an Ecological Management Plan for this wetland. It is felt that it is proper to present a brief on the physical and biological characteristics of the wetland prior to presenting the EMP. Therefore, the presentation of this report is planned accordingly. More »»

2003

Journal Article

M. Saravanan, Raj, P. C. Reghu, Raman, S., and Dr. P. P. Nikhil Raj, “Summarization and categorization of text data in high-level data cleaning for information retrieval”, Applied Artificial Intelligence, vol. 17, pp. 461-474, 2003.[Abstract]


problem is automatic domain-specific summarization tailored to user's needs, which is a kind of high-level data cleaning. This requires some method of discovering classes of similar items that may be grouped into predetermined domains. We explore whether there exists a synergic relation between systems for classification and those for summarization by way of composing those subsystems. In other words, we examine whether prior summarization will increase the performance of the classifier system and vice versa. In both cases, the answer is affirmative, as we show in this paper. We propose a text-mining framework in which these subsystems are treated as constituents of a knowledge discovery process for text corpora. More »»

Publication Type: Conference Paper

Year of Publication Publication Type Title

2012

Conference Paper

A. Kumar, Kaushik, S. K., Sharma, R., and Dr. P. P. Nikhil Raj, “Simulators for Wireless Networks: A Comparative Study”, in 2012 International Conference on Computing Sciences, 2012.[Abstract]


Network simulation is the most predominant evaluation techniques in the area of computer Networks. The simulation models in a reliable and simple way can be developed by researchers using different simulators for evaluating the behavior and performance of protocols for different networks, simulations are a good example between cost and complexity by maintaining the accuracy of the results. This paper gives briefly survey on a performance comparison study of the different network simulators for wireless network. There are many simulators for wireless network, but among them five are the popular simulators these are: Qualnet/GlomoSim, OM-Net++, Ns-2, OPNET modeler and JSim with a real-world test bed. The information about each of the simulator abilities, their internal structure, development environment and their support for wireless network simulation has detailed discussed in this paper. This paper helps to identify one is best option among shown simulator for their best need. Finally, the paper contains survey, comparatively study and conclusion about making the suitable choice of network simulator supporting wireless network based on the numbers of surveys and papers. More »»

2012

Conference Paper

S. K. Kaushik, Chahal, K., Dhariwal, S., Kumar, A., Raj, P., and Dr. P. P. Nikhil Raj, “Analysis of TCP Performance over Mobile Ad Hoc Networks with Varying Speed”, in 2012 International Conference on Computing Sciences, 2012.[Abstract]


Transmission Control Protocol (TCP) is a connection oriented protocol for reliable end-to-end data delivery over IP networks. TCP is unable to distinguish between packet losses induced by network congestion and wireless packet losses. TCP assume every packet loss or delay due to congestion. Wireless Mobile Ad-hoc networks offer challenges to TCP congestion control mechanism because mobile Ad-hoc networks encounter several types of losses or delays that are unrelated to congestion such as high BER, delays due to reordering of packets. Several approaches have been proposed to deal with this issue that can be categorized to either end system based or network assisted. This paper will present such approaches & their characteristics. Moreover the paper points out comparison of the performance of different routing protocols with varying speed & maximum packets size. Evaluation of the performance of different TCP variants over different routing protocols has also been performed.

More »»

2009

Conference Paper

Dr. P. P. Nikhil Raj and Azeez, P. A., “Historical analysis of the first rain event and the number of rain days in the western part of Palakkad gap, south India”, in Climate Change: Global Risks, Challenges and Decisions IOP Conferences Series: Earth and Environmental Science, 2009.

2003

Conference Paper

V. S. Murty, Raj, P. C. Reghu, Raman, S., and Dr. P. P. Nikhil Raj, “Design of a high speed string matching co-processor for NLP”, in 16th International Conference on VLSI Design, 2003. Proceedings., 2003.[Abstract]


In Natural Language Processing applications, string matching is the main time-consuming operation. A dedicated co-processor for string matching that uses memory interleaving and parallel processing techniques can relieve the host CPU from this burden. This paper reports the FPGA design of such a system with m parallel matching units. It has been shown to improve the performance by a factor of nearly m, without increasing the chip area by more than 45% The time complexity of the proposed algorithm is O(log2 n), where n is the number of lexical entries. The memory used by the lexicon has been efficiently organized and the space saving achieved is about 67%. More »»

2003

Conference Paper

V. S. Murty, Raj, P. C. Reghu, Raman, S., and Dr. P. P. Nikhil Raj, “Design of a language-independent parallel string matching unit for NLP”, in 2003 IEEE International Workshop on Computer Architectures for Machine Perception, 2003.[Abstract]


In natural language processing applications, string matching is the main time-consuming operation due to the large size of lexicon. Data dependence is minimal in string matching operations, and hence it is ideal for parallelization. A dedicated hardware for string matching that uses memory interleaving and parallel processing techniques can relieve the host CPU from this burden, thereby making the system suitable for real-time applications. This paper reports the FPGA design of such a system with m parallel matching units. The time complexity of the proposed algorithm is O (log2 n), where n is the total number of lexical entries. This has been achieved by a proper selection of the value of m. A special memory organization technique, which reduces the storage space by nearly 70%, has been adopted for storing lexical entries. The techniques used for matching and storage of lexical entries make the system language independent More »»

2003

Conference Paper

P. C. Reghu Raj, Raman, S., and Dr. P. P. Nikhil Raj, “Mapping Documents Onto Concept Databases for Threshold-Based Retrieval.”, in ICEIS (2), 2003.

2002

Conference Paper

M. Saravanan, Raj, P. C. Reghu, Murthy, V. S., Raman, S., and Dr. P. P. Nikhil Raj, “Improved porter’s algorithm for root word stemming”, in Proc. of International Conference on Natural language Processing (ICON’02), 2002.

Publication Type: Thesis

Year of Publication Publication Type Title

2011

Thesis

Dr. P. P. Nikhil Raj, “An analysis of the environmental changes in the Bharathapuzha river basin, southern India.”, Bharathiar University, Coimbatore, India, 2011.

Faculty Research Interest: 
207
PROGRAMS
OFFERED
5
AMRITA
CAMPUSES
15
CONSTITUENT
SCHOOLS
A
GRADE BY
NAAC, MHRD
9th
RANK(INDIA):
NIRF 2017
150+
INTERNATIONAL
PARTNERS