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Search Results: 1 - 10 of 298996 matches for " J. Sheela-Francisca "
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Heat Transfer with Viscous Dissipation in Couette-Poiseuille Flow under Asymmetric Wall Heat Fluxes  [PDF]
J. Sheela-Francisca, C. P. Tso, Dirk Rilling
Open Journal of Fluid Dynamics (OJFD) , 2012, DOI: 10.4236/ojfd.2012.24011
Abstract: Analytical solutions of temperature distributions and the Nusselt numbers in forced convection are reported for flow through infinitely long parallel plates, where the upper plate moves in the flow direction with constant velocity and the lower plate is kept stationary. The flow is assumed to be laminar, both hydro-dynamically and thermally fully developed, taking into account the effect of viscous dissipation of the flowing fluid. Both the plates being kept at specified and at different constant heat fluxes are considered as thermal boundary conditions. The solutions obtained from energy equation are in terms of Brinkman number, dimensionless velocity and heat flux ratio. These parameters greatly influence and give complete understanding on heat transfer rates that has potentials for designing and analyzing energy equipment and processes.
Comparative Analysis and Design of Statistical Estimation for Various Adaptive Algorithms in Speech Signal Processing
J. Jebastine,B. Sheela Rani
International Journal of Advanced Electrical and Electronics Engineering , 2012,
Abstract: Effective noise deportation in an acoustic environment is a very essential criteria in the field of telecommunication and signal processing since it is highly preferable to have a noiseless system. Noise problems in the environment have gained attention, as noise levels have been increasing due to the tremendous growth of technology that has led to noisy engines, heavy machinery, high speed wind buffeting and other noise sources. The problem of reducing the noise level has become the focus of a burgeoning field of research over the years. Adaptive filters came into existence to solve this hitch and it has become one of the well known and most popular approaches for the processing and analysis of speech signal. Adaptive filtering is an important basis for signal processing, in recent years has developed rapidly in various fields on a wide range of applications. This proposal focuses on the comparison of various algorithms of adaptive filters and also strives to remove the White Gaussian Noise from the original speech signal. The algorithms employed are LMS, NLMS, B- LMS, FxBLMS, RLS, and FxT-RLS. The statistical parameters using which the algorithms are analyzed and compared are Convergence speed, power spectral density, Signal to Noise ratio, stability and percentage noise removal. The performances of the various algorithms are compared by simulation using MATLAB. Based on the statistical parameters the unrivaled algorithm among all is resolved for effective noise cancellation in speech signal.
Design and Implementation of Noise Free Audio Speech Signal Using Fast Block Least Mean Square Algorithm
J. Jebastine,B. Sheela Rani
Signal & Image Processing , 2012,
Abstract: This paper describes the development of an adaptive noise cancellation algorithm for effective recognition of speech signal and also to improve SNR for an adaptive step size input. An adaptive filter with Fast Block Least Mean square Algorithm is designed for noise free audio (speech/music) signals. The signal input used is a audio speech signal which could be in the form of a recorded voice. The filter used is adaptive filter and the algorithm used is Fast Block LMS algorithm. A Gaussian noise is added to this input signal and given as a input to the Fast Block LMS. The algorithm is implemented in Matlab and was tested fornoise cancellation in speech signals. A Simulink model is designed which results in a noise free audiospeech signal at the output. The FBLMS algorithm is computationally efficient in noise cancellation. The noise level in speech signal can be 1) mild, 2) moderate, 3) severe. The SNR is estimated by varying the adaptive step size.
Qualitative analysis of re mineralized carious lesions subjected to fluoride supplement through confocal laser scanning microscope  [PDF]
K. Shashikala, N. V. Sheela
Open Journal of Stomatology (OJST) , 2011, DOI: 10.4236/ojst.2011.13010
Abstract: Aim: 1] Comparative evaluation of the linear depth of induced remineralized lesions after subjecting to fluoride supplements and 2] To assess the average fluorescence at both the demineralized and the remi-neralized zones in all the three study groups under confocal laser scanning microscope. Method: Forty five sound human premolars extracted for orthodon-tic reasons were decoronated 1 mm below the ce-mento-enamel junction and coated with nail varnish except for a 3 × 3 mm window on the buccal surface. The samples were placed in 50 ml of de mineralizing solution at pH 4.6 for 96 hours. Following deminera-lization, the lower half of the 3 × 3 mm window in all the samples were covered with nail varnish to serve as control. The samples were randomly divided into three groups of fifteen teeth each (n = 15) and speci-mens in group A[Nfd] were remineralized using non-fluoridated dentifrice [control], those in groups B [Fd5] and group C [Fd10] using 500 ppm and 1000 ppm of fluoride containing dentifrice, respectively. The specimens were subjected to a 20 day reminera-lization treatment regimen and were sectioned into 100 µm thick sections and two images were captured on the buccal surface from either side of the midpoint of occluso-cervical length using confocal laser scan-ning microscope [CLSM]. Results: were tabulated and statistically analyzed by Anova. Study concluded that 1000 ppm fluoridated dentifrice showed a greater degree of remineralization than other groups and confocal laser scanning microscopes gives promising results in the diagnosis of early enamel lesions over the conventional methods.
Thyroid Ultrasonography Consistently Identifies Goiter in Adults Over the Age of 30 Years Despite a Diminished Response with Aging of the Thyroid Gland to the Effects of Goitrogenesis
Sheela R. Brahmbhatt,Rajesh M. Brahmbhatt,Creswell J. Eastman,Steven C. Boyages
The Scientific World Journal , 2001, DOI: 10.1100/tsw.2001.55
15-LOX metabolites and angiogenesis: angiostatic effect of 15(S)-HPETE involves induction of apoptosis in adipose endothelial cells
Sasikumar J. Soumya,Sheela Binu,Antony Helen,Pallu Reddanna,Perumana R. Sudhakaran
PeerJ , 2015, DOI: 10.7717/peerj.635
Abstract: Inflammation is critical in the dysregulated growth of adipose tissue and associated vascular dysfunctions. 15-Lipoxygenase metabolites, important mediators of inflammation in adipose tissue during obese conditions, may contribute to codependence of inflammation and angiogenesis in adipose tissue. We have already reported the pro-angiogenic effect of 15(S)-HETE in adipose tissue. The present study was designed to understand the effect of 15(S)-HPETE, precursor of 15(S)-HETE, on angiogenesis in adipose tissue. Results showed that 15(S)-HPETE exerts an anti-angiogenic effect in adipose tissue. This was evidenced from decreased endothelial sprouting in adipose tissue explants, inhibition of angiogenic phenotype in adipose endothelial cells, decreased production of CD31 and VEGF in endothelial cells treated with 15(S)-HPETE. Further studies to examine the molecular mechanism of anti-angiogenic effect of 15(S)-HPETE showed that it inhibited cell survival signaling molecule Akt and anti-apoptotic Bcl-2 and also activated caspase-3 in adipose endothelial cells. These observations indicate that 15(S)-HPETE exerts its angiostatic effect in adipose tissue by inducing apoptosis of endothelial cells.
An algorithm to compute a rule for division problems with multiple references
Sánchez Sánchez, Francisca J.
Rect@ , 2012,
Abstract: In this paper we consider an extension of the classic division problem with claims: Thedivision problem with multiple references. Hinojosa et al. (2012) provide a solution for this type of pro-blems. The aim of this work is to extend their results by proposing an algorithm that calculates allocationsbased on these results. All computational details are provided in the paper.
Stimulation of antioxidant system and lipid peroxidation by abiotic stresses in leaves of Momordica charantia
Agarwal, Sheela;Shaheen, Robina;
Brazilian Journal of Plant Physiology , 2007, DOI: 10.1590/S1677-04202007000200007
Abstract: the purpose of the present work was to evaluate both the antioxidant response system and oxidative stress in leaves from bitter gourd (momordica charantia l) subjected to nacl, uv-b and water stresses at three different stages of plant growth: pre-flowering, flowering and post-flowering. except for peroxidase (pox), all enzyme activities including superoxide dismutase (sod), catalase (cat), polyphenol oxidase (ppo), glutathione reductase (gr), as well as concentrations of ascorbate (asa), hydrogen peroxide (h2o2) and thiobarbituric acid reactive substances (tbars) exhibited maximum values at the flowering stage under all three stresses. all the enzyme activities, sod, cat, pox, ppo, gr and the concentrations of asa, h2o2 and tbars were elevated under nacl and uv-b stresses at all growth stages with the exception of h2o2 concentration at the post-flowering stage under uv-b radiation. greater quantities of the inorganic ions na+ and cl- were accumulated at all growth stages under salt stress. drought led to decreases in the concentrations of h2o2, asa and activities of ppo and gr; conversely, it led to elevated concentrations of tbars and activities of sod, cat, pox at all three stages in comparison with control values. the pox activity at the third stage was, however, reduced. the photosynthetic pigments decreased at all stages under all stresses. the chlorophyll stability index decreased under nacl stress, accelerated only at the post-flowering stage under uv-b radiation and significantly increased at pre- and post-flowering stages under water stress. the protein concentration under nacl stress decreased except at the pre-flowering stage and under uv-b and water stresses the protein concentration was higher than that of the control and nacl treatment. it is suggested that m. charantia exhibits a protection mechanism against oxidative damage by maintaining a highly induced antioxidant system under all three stresses.
Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: The process of globalization that accelerated during the last decade of the twentieth century is generally associated with easier and increased cross-border capital flows, trade, and integration of world markets. There had been another globalizing influence quietly taking hold and spreading through the twentieth century which has been continuing to do so in the twenty-first too that is the English language. English emerged as the lingua franca of the world in the twentieth century, and promises to grow in that stature in the twenty-first. Its presence is overwhelming: in education, business, research, science and technology, entertainment, the Internet, and almost every other sphere of human engagement. According to estimates, it is spoken by some two billion people at various levels of fluency around the world, including 380 million native speakers (people in the US, UK, Canada, Ireland, and Australia), and those who learn it as a second or foreign language. Even though, in numbers, this is just about a third of the world's population, the geographical and domain spread of English is greater than that of any other language. In a sense, English is being globalized as well as acting as a globalizer (Betty Kirkpatrick : 2005).This paper cites how English Language is becoming a source of competitive advantage in the new age knowledge economy, keeping in view the imperial pursuits and spread of culture as well as an employability
Golden Research Thoughts , 2013, DOI: 10.9780/22315063
Abstract: Over the past 10 years, the number of English language learners (ELLs) in thenation's schools and colleges have increased by 95% (National Clearinghouse forEnglish Language Acquisition, 2004a). The latest statistics show that there are currently4.7 million students who are in the process of learning English as a second languagewhile learning academic content (NCELA, 2004a).Despite this ongoing change in thecharacteristics of our student population, most teachers have had little or nopreparation for working with ELLs. However, the sheer volume of information aboutLanguage teaching is overwhelming. Consequently, teachers can succumb to the allureof strategy books. Extracting strategies from books without an understanding of ELLs'unique language and learning needs is like building a house without understanding thebasic principles of construction .So how to begin building the necessary understandingof ELLs' language and learning, is the question, teachers need to consider. Equallyimportant in this age of accountability is the need for teachers to be knowledgeableabout the scientifically-based evidence about the kinds of teaching approaches.Teachers not only have to make informed pedagogical decisions about teaching theirELLs, they have to be ready to justify their decisions to administrators, parents, andteacher colleagues as well. Sometimes, in some of the teachers ,problematic behaviorcrops up in connection with troubles emerging in personal life. Some teachers ignorepolicy and procedures and some indulge in illegal activity. So definitely these thingsbring negative impact on the learning of students and their teaching. So showingprofessionalism in the classroom is necessary and mandatory for the teacher to beefficient in his/her profession. This paper examines the need of showing professionalismin the classroom as well as how to develop professionalism.
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