2,867 research outputs found

    MHD Flow of Fractionalized Jeffrey Fluid with Newtonian Heating and Thermal Radiation Over a Vertical Plate

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    The objective of this paper is to analyze the influence of heat absorption/generation and mass diffusion on magnetohydrodynamics(MHD) Jeffrey fluid flow over a perpendicular plate moving exponentially immersed in a porous media. The Newtonian heating condition are udes for the fluid motion. The impact of thermal radiation is used in the energy equation. The two types of magnetic field have been evaluated. The main purpose of present work is to acquire the analytical solution with the help of Atangana-Baleanu (AB), Caputo, and Caputo-Fabrizio fractional derivatives. We have drawn a graphical comparison between the solutions of these three types of fractional models of jeffery fluid. Graphs of different parameters have been also plotted using MathCad software. Furthermore, comparison among ordinary and fractionalized velocity fields are made to observe the impact of fractional parameter . It is clear from graph that velocity obtained with ordinary derivative is higher than that obtained with fractional derivatives. It is also found that velocity obtained with Atangana-Baleanu (AB) fractional derivative is smaller than that obtained with Caputo and Caputo-Fabrizio fractional derivatives. Therefore, Atangana-Baleanu fractional derivative is the best choice to obtain controlled velocity

    Detailed study on optical properties of Li2B4O7 for down conversion to millimeter waves

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    For the first time, we measured the laser damage threshold of LB4 nonlinear crystal (≥ 10 TW/cm2) for an fs- (60 fs, 950 nm) pulses. Refractive index components for a THz range 0.15-1.6 THz were measured and carefully reapproximated in terms of Sellmeier dispersion equations. Using the equations and the measured optical breakdown threshold, the efficiency of THz radiation generation is estimated for all possible types of three wave interactions. For e–e → e type of interaction deff = (2d15 + d31)cos2sin + d33sin3, o–o → e type deff = d31sin, and for o–e → o type deff = d15sin. The angle at which the phase matching conditions are achieved for THz radiation generation at frequencies < 1.5 THz is ≤ 10. Small values of the phase matching angles and, accordingly, small values of effective nonlinear coefficients explain the lack of experimental studies on the THz generation. The extremely high optical breakdown threshold and high atmospheric transmission in the longwavelength part of the THz range overcompensate low efficient nonlinear coefficients of LB4. Which makes it prospective for long trace high sensitivity probing of the atmosphere composition and parameters

    Detailed study on optical properties of Li2B4O7 for down-conversion to millimeter waves

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    Optical properties of single axes Li2B4O7 (LB4) crystal are defined at room temperature in the spectral range 0.03˗0.5 THz. Dispersion of the refractive index components are approximated in the form of Sellmeier equations. Dispersion properties were used to determine phase-matching conditions for THz wave generation by collinear difference frequency generation processes. To the damage threshold under the pump by train of hundreds of 60 fs pulses of Ti:sapphire laser operating at 950 nm is found to be 250 TW/cm2, as well as the coherence length and efficiency of all possible types of three wave interactions are defined

    Cage Farming of Cobia Rachycentron canadum

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    Cobia has gained popularity as a good candidate for mariculture due to its rapid growth and white meat of versatile use. It is considered as one of the most promising candidates for warm-water marine fish aquaculture in the world. Being the only member of the family Rachycentridae, it is found in the warm, temperate to tropical waters of the West and East Atlantic, throughout the Caribbean and in the Indo-Pacific off India, Australia and Japan. To date, research and development of cobia aquaculture has been initiated in over 23 countries and territories

    Demographical and population dynamics impact on public health of cutaneous Leishmaniasis in Al-Madinah Almonawra, Saudi Arabia

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    Background: A cross-sectional study conducted in Al-Madinah Almonawra in KSA held during the period from March 2014-March 2015.Aim of the study: This study aimed at analyzing the effect of population dynamics on the current situation of cutaneous leishmaniasis in Al-Madinah Almonawarah area, a holy city that attracts millions of muslims annually.Methodology: Epidemiological and clinical data were collected by especial questionnaire and laboratory specimens were collected using skin scraping and needle aspiration. Staining and direct microscopy were done. LST was conducted. Analysis was done using SPSS program.Results: The study included 164 patients, all of them were men. Saudi nationality comprised around 20% of the study group, the majority were Egyptians, 26.2%, followed by Pakistani, 21.3%.Conclusion: The presence of non-Saudi nationality as foreign workers, immigrants and refugees has worsened the current situation of the disease.Keywords: Cutaneous leishmaniasis, refugees, immigration, L. tropica, L. major. Sandfly

    Farming of Silver Pompano Trachinotus blochii in coastal aquaculture ponds

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    The Central Marine Fisheries Research Institute has initiated aquaculture research on pompano from 2008 and the first successful broodstock development, induced breeding and larval production was achieved in 2011. Following the successful seed production of silver pompano, demonstration of farming in brackishwater ponds was initiated by the CMFRI to popularize among the farmers about its suitability for aquaculture. The first farming demonstration from the hatchery produced seed was carried out in a coastal aquaculture pond at Anthervedi Village, East Godavari District, Andhra Pradesh. It has been proven that silver pompano can be cultured in the brackishwater shrimp culture ponds as an alternative species with high survival rate, appreciable FCR and meat quality. These fishes have attained an average weight of 450 grams in 240 days (8 months). Based on the experience gained on the brackishwater farming of silver pompano, the practices to be adopted for pompano farming are narrated

    समुद्रि अलंकारी मछलियों का टिकाऊ व्यवसाय का विकास

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