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Search Results: 1 - 10 of 362 matches for " Hiral vyas "
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Therapeutic Efficacy of Misoprostol versus Ethacridine Lactate in Second Trimester Abortion Randomised Controlled Study
Kruti Deliwala,Hiral Shah,Rupa Vyas
National Journal of Medical Research , 2013,
Abstract: Background: Abortion is a major health and social issue in our country .Techniques for abortions are highly varied in different areas of country. Present study is to compare newer abortificient misoprostol versus traditionally used ethacridine lactate method. Objective: To observe the efficacy and safety of misoprostol as a second trimester abortificient and to compare it with ethacridine lactate. Methods: This is a prospective study of 100 women with 12 20 weeks of gestation. Inclusions were according to MTP Act. 400ug misoprostol was inserted vaginally followed by 200ug every 4 hourly in study group (n=50).150-200ml of ethacridine lactate was injected extraamniotically in control group (n=50).Latent phase, active phase and induction abortion interval was noted and compared Results: Average induction abortion interval was 12.24 hours in misoprostol as compared to 27.6 hours in ethacridine lactate (P value <0.01). The women undergoing D & E due to incomplete abortion was higher with ethacridine group 12( 24%) as compared to misoprostol group 8 (14%) (P <0.05). Conclusion: Misoprostol is faster, convenient, and safer than ethacridine lactate for 2nd trimester abortion. [Natl J of Med Res 2013; 3(1.000): 16-18]
Controlled Release Matrix Uncoated Tablets of Enalapril Maleate using HPMC alone
Anroop B. Nair,Hiral vyas,Ashok Kumar
Journal of Basic and Clinical Pharmacy , 2010,
Abstract: Hydroxy propyl methyl cellulose (HPMC) is generally combined with hydrophobic polymers in fabricating oral controlled solid dosage forms. This study evaluated the utility of diverse grades of HPMC in developing a controlled release formulation for a hydrophilic drug, enalapril maleate. Controlled release uncoated tablets were prepared by direct compression technique. Two grades of HPMC (K100 and K4M) in different proportions were used to prepare the tablets, and were evaluated for physical properties, drug content, in vitro drug release and drug release kinetics as well. All the formulations demonstrated good physical integrity and the drug content were in the official limits. The formulation with HPMC K100 (25 mg/tablet) and K4M (15 mg/tablet) have been found to release the required amount of drug (2.97 mg/h) through out the study period (14 h). The calculated regression coefficients showed higher r2 value with Higuchi model and zero order kinetics. Given the excellent release profile, the study concluded that HPMC in different grades with low concentration alone can control the enalapril maleate release over a period of time (14 h).
Motion Estimation Using Optical Flow Concepts
Hiral Raveshiya,Viral Borisagar
International Journal of Computer Technology and Applications , 2012,
Abstract: motion estimation is demanding field among researchers. The most general and challenging version of motion estimation is to compute an independent estimate of motion at each pixel, which is generally known as optical or optic flow. In our paper we have provided overview of some basic concepts behind optical flow and motion estimation. The paper is intended as starting point for beginners. Some common techniques and application of motion estimation is provided for the review of readers who are interested in this field.
Dirichlet Averages, Fractional Integral Operators and Solution of Euler-Darboux Equation on Hölder Spaces  [PDF]
D. N. Vyas
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.714129
Abstract: In the present paper, we discuss the solution of Euler-Darboux equation in terms of Dirichlet averages of boundary conditions on H?lder space and weighted H?lder spaces of continuous functions using Riemann-Liouville fractional integral operators. Moreover, the results are interpreted in alternative form.
Synthesis and Characterization of novel 6-[3,5-bis(trifluoromethyl)phenyl]-4-(substitutedphenyl)-1,4-dihydropyrimidin-2-ol
Tejas Vyas,Kartik Vyas
International Journal For Pharmaceutical Research Scholars , 2012,
Abstract: Synthesis of various pyrimidines 3(a-o) from (E)-1-(3,5-bis(trifluoromethyl)phenyl)-3-(substituted)phenylprop-2-en-1-one and Urea in presence of NaOH. The structures of the synthesized compounds were confirmed on the basis of spectral and elemental analysis. The synthesized compounds were screened for antimicrobial activity.
Synthesis and Characterization of novel 4-[3,5-bis(trifluoromethyl)phenyl]-6-(Substituted phenyl)-1,6-dihydropyrimidine-2-thiol
Tejas Vyas,Kartik Vyas
International Journal For Pharmaceutical Research Scholars , 2012,
Abstract: Synthesis of various dihydropyrimidine-2-thiol from (E)-1-(3,5-bis(trifluoromethyl)phenyl)-3-(substituted)phenylprop-2-en-1-one and thiourea in presence of NaOH. The structures of thesynthesized compounds were confirmed on the basis of spectral and elemental analysis.
Long-Term Changes in Night Time Airglow Emission at 557.7 nm over Mid Latitude Japanese Station i.e., Kiso (35.79oN, 137.63oE)  [PDF]
Brij Mohan Vyas, Vimal Saraswat
American Journal of Climate Change (AJCC) , 2012, DOI: 10.4236/ajcc.2012.14018
Abstract:

The present study describes the long-term changes in Pre-midnight and Midnight airglow intensities of 557.7 nm during the period 1979-1994 over mid latitude Japanese station i.e., Kiso, Tokyo Astronomical Observatory, University of Tokyo (35.79oN, 137.63oE; 1130 m), Japan. It has observed that there is a positive increasing decadal change in Midnight and Pre-midnight mesospheric airglow intensity of the range 25 - 88 R. This range is the order of 10 to 30% of the observed MARV and average night airglow intensity of 250 R. Besides this long-term trend, inter-annual monthly variation is also seen from fluctuation of yearly variation of deviation values from MARV to particular average monthly values. The present observations about the positive decadal change in night time mesospheric airglow intensity has been further linked to the reduction of mesospheric electron densities and temperature or shrinking and cooling of the lower ionosphere as established from the long-term behavior of mesospheric parameters such as a negative decadal change in thermal structure, electron density, neutral density parameters as per studies reported by other researchers.

Original Research: Pupillary Constriction Velocity and Latency to Predict Excessive Daytime Sleepiness  [PDF]
Vyas Umesh, Woodson B. Tucker
International Journal of Clinical Medicine (IJCM) , 2015, DOI: 10.4236/ijcm.2015.611106
Abstract: Background: Excessive daytime sleepiness (EDS) is common in adults. A need exists for an easier and faster objective clinical measures of EDS. The autonomic nervous system controls pupil size and prior pupillometry studies have demonstrated associations with sleepiness. We used a novel portable device to assess pupillometry and prospectively evaluated a sleep clinic cohort. Methods: Following IRB approval Pupillometry (The ForSiteTM, NeurOptics, Irvine, CA), was performed on 113 sleep clinic patients. Constriction and dilation velocity and latencies, minimum and maximum aperture were obtained along with Epworth Sleepiness Score (ESS), 10 point Visual Analog Scale (VAS), BMI, gender, age and AHI. Three sets of measures were obtained and analyzed with ANOVA, t-test, Linear Regression and Pearson correlation coefficients (SAS, Cary, NC). Results: Both constriction velocity and latency correlated with VAS (n = 88, r = 0.28, p = 0.007 and r = 0.31, p = 0.004). Only constriction velocity correlated with AHI (n = 78, r = -0.27, p = 0.016). Multivariate linear regression which includes VAS and age predicted constriction velocity (r = 0.36, p = 0.002) and latency (r = 0.38, p = 0.001). Using Pearson correlation, AHI and VAS combined were associated with constriction velocity (-0.273 (0.016), and 0.284 (0.007), respectively). Using a maximum constriction velocity threshold value (age adjusted) of 2.8, VAS ≥ 6 was predicted with a sensitivity of 83% and specificity of 84%. Conclusions: Pupillary constriction velocity and latency predict self-reported VAS state of sleepiness. While both are affected by age, only constriction velocity is affected by apnea severity. These data suggest that a portable pupillometer may provide a method to identify individuals with abnormal sleepiness.
Total Ozone Content Trend during the Last Decade over Western Indian Tropical Station i.e. Udaipur  [PDF]
Abhishek Saxena, Brij Mohan Vyas
American Journal of Climate Change (AJCC) , 2016, DOI: 10.4236/ajcc.2016.52018
Abstract: This study focuses on multi-year change in Total Ozone Content (TOC) values measured simultaneously by ground based instrument, i.e., MICROTOPS-II sun photometer and space based TOMS satellite experiment during the last decade, i.e., the period from 2002 to 2009 in the outskirts of the semi-arid and semi-urban tropical region of Udaipur (24.6°N, 74°E; 580 m asl), India. The negative declining trend in TOC value has been detected about 2 DU/decade by using Linear Regression Analysis (LRA) of the monthly averaged TOC levels. The LRA presents the best statistically significant percentage level (p) of greater than 99%. From the comparison of present result with the observations reported over mid, high and polar latitude sites, long-term TOC variability from tropical site is found to be the lowest, followed by their intermediate range from 10 to 30 DU/ decade over mid latitude sites and the highest range from 30 to 50 DU/decade over high to polar latitude. In order to establish the possible linking of reduction in TOC level per decade with other stratospheric dynamic parameters and atmospheric UV aerosols parameter, inter-annual change in average monthly TOC level has shown a strong correlation coefficient (r) of the order of 0.73 (p > 99.9990) with the stratospheric temperature, followed by its observed lower r value of 0.25 (p = 99%) for stratospheric zonal wind and then a significant correlation (r = 0.17; p = 95%) for AI 300 nm (Aerosols Index 300 nm) parameter. The variation of monthly mean meridional wind component does not illustrate a statistically significant correlation (r = 0.13; p < 80%) with their respective multi-year change in mean monthly TOC values. The consequence of such reduction of TOC per decade may be identified as the result of expected enhancement in incident ground UV-radiation level. At the same time, the harmful influence of increasing the UV level seems to be counteracted and reduced with the evidence of observed higher level of AI at 300 nm as high as 3 in the summer months over selected tropical environmental site.
Generation of Optical Vortices by Linear Phase Ramps
Sunil Vyas
International Journal of Optics , 2012, DOI: 10.1155/2012/794259
Abstract: Generation of optical vortices using linear phase ramps is experimentally demonstrated. When two regions of a wavefront have opposite phase gradients then along the line of phase discontinuity vortices can be generated. It is shown that vortices can evolve during propagation even with the unequal magnitude of tilt in the two regions of the wavefront. The number of vortices and their location depend upon the magnitude of tilt. vortex generation is experimentally realized by encoding phase mask on spatial light modulator and their presence is detected interferometrically. Numerical simulation has been performed to calculate the diffracted intensity distribution from the phase mask, and presence of vortices in the diffracted field is detected by computational techniques. 1. Introduction Optical fields possessing phase singularities or wavefront dislocations have received great deal of attention in recent years because of their fascinating properties and potential applications. The study of phenomena associated with phase singularities has generated a new branch of physical optics called singular optics, which reveals their basic properties and possible applications. Phase singularities also known as optical vortices are the points where the real and imaginary part of wave function vanishes. At phase singular points amplitude is zero and the phase is indeterminate. As a result, the wave front acquires the shape of helicoids, causing the precession of the Poynting vector. Nye and Berry showed that vortices in scalar field are strongly connected with the phase discontinuities or singularities [1]. Near the dislocation centers the phase gradients line is found to form closed vortex-like structures. Optical vortices can appear spontaneously or can be created in one of several ways, such as by the manipulation of laser cavity [2], transforming Gaussian beams into helical beams [3], computer generated holograms [4], cylindrical lenses [5], and spiral phase plates [6]. In recent years several important applications of optical vortices have been demonstrated. For example vortices have been used in optical tweezers [7], wave guiding [8], astronomy as coronagraph [9], optical testing [10], and so forth. In this paper, experimental and simulation studies are performed to show the formation of vortices along the line of phase discontinuity which arises due to the different phase gradients in the wavefront. To explain the concept of vortex evolution we first discussed a simple case in which the two parts of the wavefront are given equal and opposite phase variations.
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