St Anthonys College

Shillong, India

St Anthonys College

Shillong, India
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Saikia S.,St Anthonys College
Physica A: Statistical Mechanics and its Applications | Year: 2017

Ratchet effect in a driven underdamped periodic potential system is studied. The presence of a space dependent and periodic friction coefficient, but with a phase difference with the symmetric periodic potential is shown to generate substantial ratchet current. The ratchet performance is characterised in terms of the various parameters of transport. The performance of this ratchet is compared with a ratchet with an underlying periodic and asymmetric potential. It is shown that an optimum combination of inhomogeneity in the system and asymmetry of the potential can substantially enhance the performance of an underdamped ratchet. © 2016 Elsevier B.V.


Saikia S.,North - Eastern Hill University | Saikia S.,St Anthonys College | Jayannavar A.M.,Institute of Physics, Bhubaneswar | Mahato M.C.,North - Eastern Hill University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2011

The phenomenon of stochastic resonance (SR) is known to occur mostly in bistable systems. However, the question of the occurrence of SR in periodic potential systems has not been resolved conclusively. Our present numerical work shows that the periodic potential system indeed exhibits SR in the high-frequency regime, where the linear-response theory yields maximum frequency-dependent mobility as a function of noise strength. The existence of two (and only two) distinct dynamical states of trajectories in this moderately feebly damped periodically driven noisy periodic potential system plays an important role in the occurrence of SR. © 2011 American Physical Society.


Konwarh R.,Tezpur University | Gogoi B.,Tezpur University | Philip R.,St Anthonys College | Laskar M.A.,St Anthonys College | Karak N.,Tezpur University
Colloids and Surfaces B: Biointerfaces | Year: 2011

In the pursuit of making the nanoscale-research greener, the utilization of the reductive potency of a common byproduct of food processing industry i.e. orange peel is reported here to prepare biopolymer-templated " green" silver nanoparticles. Aqueous extract of orange peel at basic pH was exploited to prepare starch supported nanoparticles under ambient conditions. The compositional abundance of pectins, flavonoids, ascorbic acid, sugars, carotenoids and myriad other flavones may be envisaged for the effective reductive potential of orange peel to generate silver nanoparticles. The nanoparticles were distributed within a narrow size spectrum of (3-12. nm) with characteristic Bragg's reflection planes of fcc structure, and surface plasmon resonance peak at 404. nm. Anti-lipid peroxidation assay using goat liver homogenate and DPPH scavenging test established the anti-oxidant potency of the silver nanoparticles. Their synergy with rifampicin against Bacillus subtilis MTCC 736 and cytocompatibility with the human leukemic monocytic cell line, THP-1 were also investigated. Thus, the present work deals with the preparation of starch assisted anti-microbial, cytocompatible and free radical scavenging " green" silver nanoparticles. © 2011 Elsevier B.V.


Tham M.J.,St Anthonys College
Proceedings - 2012 3rd National Conference on Emerging Trends and Applications in Computer Science, NCETACS-2012 | Year: 2012

Several tagsets have been developed for Indian languages belonging to the Indo-Aryan and Dravidian families. This is because the major chunk of India's spoken language belongs to these categories. Khasi, on the other hand, belongs to the Austro-Asiatic family and is spoken primarily in the state of Meghalaya. To the best of my knowledge, language technology for Khasi is practically nonexistent and work on computational linguistic for the language is very scant. This proves to be a challenge when an attempt is made to provide access to technology using language when the basic tools needed are not available. There exists a common Part of Speech Tagset framework for Indian languages (IL-POSTS) covering the morphologically rich Indian languages under the Indo-Aryan and Dravidian families. However, in this paper the EAGLES guidelines are used for developing the Khasi tagset due to the natural infinity of the language to English. This is obvious from the script used, which is the Roman script and the word order is also primarily SVO. © 2012 IEEE.


Das A.,St Anthonys College
Proceedings - 2012 3rd National Conference on Emerging Trends and Applications in Computer Science, NCETACS-2012 | Year: 2012

Sensor association rules have been found to be very useful for improving the quality of service, energy conservation, resource management, etc. in wireless sensor networks (WSN). Most of the association rule mining algorithms for sensor networks require the behavioral data, which describes the sensor activities, to be sent to the central node (sink node) by the sensors. Then, the sink node creates the sensor database and applies different algorithms to find association rules from the sensor database. In this paper, we propose an in-network mechanism to find frequent sensor patterns in the sensors themselves. So, the sensors send only the frequent senor patterns to the sink, not the sensor activity sets. © 2012 IEEE.


Dey S.,St Anthonys College
Indian Journal of Community Health | Year: 2014

Background: Despite the fact that contraceptive usage has increased over a period of time, there exists a Knowledge Attitude and Practice-gap regarding contraception. There are multiple reasons for not using any family planning methods, current study attempts to explore these reasons. Aims: To study the family planning practices/methods among the married women of reproductive age groups. Study Design: Community-based cross-sectional study. Study Subjects: The Women of reproductive age groups adopting family planning methods & those residing in urban slums of Shillong city. Sample size: 1417. Study Period: April 2010 to March 2012. Sampling Technique: Two-stage random sampling. Results: Overall, the contraceptive prevalence rate (CPR) was 38. The contraceptive use is high among women who have two to three surviving children (37.1 percent). Majority of the women who were adopting any of the family planning method belonged to the age group 18-24 years. Women's education and occupation are important determinants that demonstrate highly significant positive relationships with any contraceptive use in the slum-dwelling women of Shillong city. Sex composition of living children also appeared to be significant determinant factor for contraceptive use. Monthly family income is also an important determinant of contraceptive use in slums of Shillong city. Conclusions: The elder women were more reluctant in contraceptive use than their younger counterparts. Sterilization is the most accepted one among all the contraceptive methods.


Tham M.J.,St Anthonys College
Proceedings - 2013 1st International Conference on Emerging Trends and Applications in Computer Science, ICETACS 2013 | Year: 2013

Khasi is an Austro-Asiatic language spoken by a small tribal community residing in the state of Meghalaya in the North Eastern region of India. Khasi is mostly analytic and partly agglutinating language and its word order is primarily SVO. The language has limited inflectional morphology but exhibits derivational morphology by using prefixes and less common is the use of suffixes and infixes. In this paper an attempt is made to perform morphological analysis and generation for Khasi based on Kimmo-two level model for morphological analysis. A limited Khasi morphological analyzer is developed using Foma (Mans Hulden finite state compiler and library) and the preliminary results of the analyzer are shown here. © 2013 IEEE.


Saikia S.,St Anthonys College
Physica A: Statistical Mechanics and its Applications | Year: 2014

The role of damping on the phenomenon of Stochastic Resonance (SR) in a driven underdamped periodic potential system is studied. Using input energy per period of external drive as a quantifier, SR is observed in the model multistable system in the high frequency regime, due to the noise assisted transitions of the particle between two distinct dynamical states of trajectories, characterized by their definite amplitude, energy and phase. SR is observed in this system only when the damping is lesser than a particular maximum limit. The stability of the two states and hence the nature of SR depends upon the damping parameter γ and the amplitude of drive. The input energy distributions at different temperatures across the SR peak, bear characteristic features associated with SR. The average input energy 〈Ei〉 per period of external drive peaks as a function γ. The phase difference γ between the particle's average response amplitude and the external drive plotted as a function of γ shows an inflection point corresponding to the peak in 〈Ei〉. Thus inflection in γ is not exclusive only to SR peaks. © 2014 Elsevier B.V. All rights reserved.


Nandi G.,St Anthonys College
Proceedings - 2011 2nd National Conference on Emerging Trends and Applications in Computer Science, NCETACS-2011 | Year: 2011

Real life databases contain many features. Many of these features may be irrelevant or redundant. For example, data recording the age of each teacher in a school is unlikely to help in assessing the success of students' results in the school. Hence, relevant analysis is needed to be performed on the data in order to identify and remove any such irrelevant or redundant attributes from the learning process. This paper explains a Las Vegas feature selection algorithm that makes probabilistic choices to help guide the search more quickly to find a correct set (or sets) of M features. This paper also proposes an enhanced version of Las Vegas algorithm which helps to speed up the running time of the Las Vegas Filter Algorithm. © 2011 IEEE.


Marak C.K.,St Anthonys College | Laskar M.A.,St Anthonys College
Scientia Horticulturae | Year: 2010

Analysis of polymorphism in ISSR amplicons revealed diverse genetic relationship between Citrus indica and five other citrus species. In a consensus UPGMA dendrogram, based on Nei and Li's distance matrices, the C. indica samples from three different sites of Meghalaya, India were clustered together with 99% bootstrap support. C. reticulata, C. sinensis, C. aurantifolia formed a cluster with 67% bootstrap separation. C. macroptera and C. maxima samples from two sites of Meghalaya formed separate clusters with respectively 100% and 98% bootstrap supports. Principal Components Analysis projected C. indica to be more closely related to C. aurantifolia than to the other citrus species of the study. PCA also exposed variations within the C. maxima and C. macroptera samples. © 2010 Elsevier B.V. All rights reserved.

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