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458 articles for “concentration”
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Use of electrolytic hydrogen bubbles for the concentration of unicellular algae
Abstract: The most of the existing unicellular algae are used for the creation of oxygen in the locked ecosystems. The concentrate of unicellular algae contains not only living cells, but also complete spectrum of the water-soluble metabolites of unicellular algae that are contained in the cultural medium. The concentrate of unicellular algae can be easily included in any existing systems of watering and feeding of animals, and also with the production …
Published in International Journal of Analytical and Applied Chemistry · Vol. 4, Issue 1, 2018 · pp. 42–49 Read article
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A New Method of Unicellular Alga Concentration using Hydrogen Bubbles Photoelectroflotation Process Powered by Solar Energy
Abstract: Most of the existing unicellular algae are used to enrich closed ecosystems with pure oxygen in the process of biosynthesis. The concentrate of unicellular algae contains not only living cells, but also the full range of water-soluble metabolites, contained in their nutrient medium. The concentrate of unicellular algae can be used in any existing animal feeding systems, as well as in the production of granular feed. The most interesting is …
Published in International Journal of Analytical and Applied Chemistry · Vol. 9, Issue 1, 2023 · pp. 1–16 Read article
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Analysis of Optimal Clearance Volume Between Two Concentric Cylinders in a Couette Flow Membrane Module Using a Computational Fluid Dynamics Approach
Abstract: Membrane-based separation has become an integral part of the separation industry due to its diverse applications across various fields. However, this progress is often hindered by two major challenges: fouling and concentration polarization. Many membrane modules have made significant efforts to overcome these obstacles, yet a satisfactory solution to mitigate these issues and facilitate membrane-based processes in the separation industries is still needed. These issues are successfully handled using Dynamic …
Published in International Journal of Environmental Chemistry · Vol. 11, Issue 1, 2025 · pp. 135–143 Read article
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The new method of the high quality concentrate of Chlorella production for its conversion to sustainable raw oil
Abstract: The microalgae concentrates are irreplaceable sources of renewable energy as microalga’s biofuel production is economically viable and sustainable. The microalga’s biofuel formed because of the possibility of microalgae’s concentrate conversion to the raw oil (biofuel). The microalga’s concentrate of Chlorella is the most suitable material for production of high quality raw oil. Existing methods of centrifugation or microfiltration of microalga Chlorella concentration are very expensive. The paper represents the new …
Published in International Journal of Renewable Energy and its Commercialization · Vol. 5, Issue 1, 2019 · pp. 58–62 Read article
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A Descriptive Study to Assess an Impact of Social Media on Mental Health Specially Targeting Prevalence Lack of Concentration & Academic Performance Among Adolescents in Selected College at Kanpur
Abstract: Background: The rise of social media has transformed how individuals connect, engage, and exchange information with one another. Adolescents are among the most active users of social media platforms, with a significant proportion of their daily lives spent online. According to a report by the Pew Research Center (2020), 70% of teens aged 13–17 use social media, with Instagram, Snapchat, and TikTok being the most popular platforms. Aim: The aim …
Published in International Journal of Neurological Nursing · Vol. 11, Issue 2, 2025 · pp. 41–52 Read article
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Quantification of Morphine, Codeine, and Dihydrocodeine in Carissa carandas Leaves and Fruit Using LC-MS/MS: The Impact of Drying on Alkaloid Concentration
Abstract: This study presents a method for quantifying morphine, codeine, and dihydrocodeine in Carissa carandas (Karonda) leaves and fruit, employing morphine-D3 as an internal standard (1 µg/mL) to ensure accuracy. Samples are prepared at 25 ng/mL and extracted using solvent techniques, with an optional solid-phase extraction step to mitigate matrix effects. Quantification is conducted via LC-MS/MS, providing robust sensitivity. Results show that drying concentrates these alkaloids, particularly morphine in fruit, due …
Published in International Journal of Environmental Chemistry · Vol. 11, Issue 1, 2025 · pp. 49–61 Read article
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Distribution Parameter Concentration of Alkalinity and Total hardness in Stagnant Water Environment: The Concepts of Oil and Gas Emission Influence
Abstract: Model for predicting the distribution parameter concentration of alkalinity and total hardness in stagnant water environment upon the influence of oil and gasemission was investigated in this paper. The model was formulated from the basic principle of mass and momentum concept which was resolved to obtain an ordinary differential equation. A mathematical tool known as the least square method was applied to resolve the differential equation to obtain quadratic equation …
Published in International Journal of Chemical Separation Technology · Vol. 6, Issue 1, 2020 · pp. 14–22 Read article
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Effects of Two Parameters Foundation on Uniform Elastic Beam Subjected to Concentrated Moving Loads with Clamped-Clamped Boundary Conditions
Abstract: AbstractThis study endeavors to explore the impacts of two foundational parameters on the dynamic response of a uniform elastic beam subjected to a concentrated moving load under clamped-clamped boundary conditions. The investigation employs the generalized Fourier integral transform alongside a series representation of the Dirac-Delta function, a modified version of Struble’s asymptotic method, and integral transformation techniques in tandem with convolution theory to derive solutions to the dynamic problem. The …
Published in International Journal of Mechanics and Design · Vol. 11, Issue 1, 2025 · pp. 15–28 Read article
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Velocity and Concentration Distribution of Turbidity Currents
Abstract: AbstractThis study conducts a comprehensive analysis of the velocity and concentration characteristics withinturbidity currents, focusing on detailed evaluations of the hydrodynamic and sediment transportproperties. The investigation includes separate calculations for the velocity and concentrationdistributions within the near-boundary and jet regions, allowing for an in-depth comparison betweenthese distinct flow areas. By computing dimensionless profiles of both velocity and concentration, thestudy offers a visual representation of flow behaviors and sediment patterns, which …
Published in International Journal of Water Resources Engineering · Vol. 10, Issue 2, 2024 · pp. 15–22 Read article
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Performance Investigation of Grating-based Photovoltaic Concentrator
Abstract: This paper elaborates the performance investigation of Grating based Photovoltaic Concentrator.Grating principle is used in the proposed concentrator photovoltaics (CPV). In this method a sidemountedconcentrator solar module structure is designed in which grating prism is used forconcentrating sunlight on solar cell. Diffraction grating is an optical device composed of a large number of closely spaced parallel slits or rulings. These rulings act as a series of narrow, closely spaced apertures …
Published in International Journal of Power Electronics Controllers and Converters · Vol. 9, Issue 1, 2023 · pp. 22–28 Read article
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IMPACT OF CLASSICAL BOUNDARY CONDITIONS ON BERNOULLI-EULER BEAM RESTING ON PASTERNAK FOUNDATION SUBJECTED TO CONCENTRATED MOVING LOAD WITH A DAMPING TERM
Abstract: Abstract The consequences of a uniform Bernoulli-Euler beam resting on a Pasternak foundation under the action of a focussed moving load with a damping term were investigated in this paper using the merely support, clamped-clamped, and clamped-free classical boundary conditions. The Laplace transform method, the extended finite integral transform, and Struble's asymptotic methodology were used to solve the governing equation after the Dirac delta function was expressed as a Fourier …
Published in International Journal of Structural Mechanics and Finite Elements · Vol. 11, Issue 2, 2025 · pp. 47–69 Read article
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Dynamics Behaviour of Clamped-Clamped Non-Uniform Elastic Beam on Two Parameters Foundation Under Concentrated Moving Load
Abstract: This paper presents a computational study on the dynamic response of a clamped–clamped non-uniform elastic beam supported by a two-parameter foundation and subjected to a concentrated moving load. The analysis incorporates the inertial contribution of the moving load. Unlike uniform models, both the mass per unit length and the moment of inertia of the beam are assumed to vary along the span LLL. The governing equations are solved using the …
Published in International Journal of Mechanics and Design · Vol. 11, Issue 2, 2025 · pp. 1–18 Read article
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Determination of the Concentration of Some Selected Metals in Unripe Plantain (Musa paradisiaca)
Abstract: Plantain (Musa paradisiaca) is a food commonly consumed in Nigeria as boiled, roasted, or fried in its ripe and unripe form. Plantains harvested in Ekpoma, a predominately plantain-growing community, were studied for their mineral and sugar composition level of the unripe. Complexometric titration was used to determine the level of calcium and magnesium, flame photometer was used for sodium and potassium determination while zinc, iron, copper, chromium, manganese, and Co …
Published in International Journal of Chemical Engineering and Processing · Vol. 10, Issue 2, 2024 · pp. 1–4 Read article
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Preliminary Studies on Chemical Characteristics Including Fluoride and Iron Concentration in Ground Waters of Telaiya, Koderma District, Jharkhand, India
Abstract: The problem of high concentration' of various chemical constituents in ground water resources has now become one of the most important health-related geo-environment issues in India. Considering above fact, a preliminary study as chemical characteristics of six groundwater and surface water samples were carried out to assess its suitability for drinking water with reference to Indian Standard Institute and World Health Organization standards and also evaluate the geo-chemical and geological …
Published in International Journal of Water Resources Engineering · Vol. 3, Issue 2, 2017 · pp. 47–52 Read article
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Application of Monod Equation and First Order RateKinetics for the Determination of TPH Concentrationalong the Depths
Abstract: In order to calculate the rate of TPH concentration along the depths, this research project applies theMonod Equation and First Order Rate Kinetics. TPH diffusion in the stagnant water medium wasexamined using the Developed Dispersion and Degradation Model integrated with the first orderdegradation rate and the Monod equation q2. TBC in both water media increased gradually over timeuntil the 56th day, and then rapidly between the 70th and 80th day. …
Published in International Journal of Renewable Energy and its Commercialization · Vol. 10, Issue 1, 2024 · pp. 26–43 Read article
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Dynamics of Progesterone Concentration and Fertility Response in Postpartum True Anestrus Buffaloes during Breeding and Low Breeding
Abstract: Efficacy of Ovsynch (OVS) and CIDR-Ovsynch (COVS) protocols in the treatment of true anestrous buffaloes and progesterone concentration was studied during breeding and low breeding season in farm and field. The percent conception rate at induced/observed estrus were 41.66(5/12) and 28.57 (4/14) in OVS and COVS group, respectively in farm conditions, while percent second service conception rate was 16.66(2/12) and 14.28(2/14) respectively, whereas percent third service conception rate was 00.00(0/12) …
Published in International Journal of Animal Biotechnology and Applications · Vol. 7, Issue 1, 2021 · pp. 32–38 Read article
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Fe, Cr, Cu, Ni and Mn Concentration Determination from Matatilla Water System by Atomic Absorption Spectroscopy
Abstract: This study was conducted to assess the extent of heavy metal in the Matatilla Dam water systems. Water quality is effect by the many substance water contacts during its movement through the hydrological system. Water dissolves a wide variety of minerals, nutrients and other substance from soils, rocks and atmosphere carries them in water system. Lake streams and ground water accumulate these dissolve substance and reflect distinctive characteristic of this …
Published in International Journal of Green Chemistry · Vol. 1, Issue 2, 2015 · pp. 1–7 Read article
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Heavy metal concentrations in two mangrove species grown in the UAE region and use of phytoremediation technology
Abstract: The mangrove vegetation of Eastern region of UAE, rhizosphere root, leaf, stem and soil sediments of two mangrove types studied for the levels of Cr, Cu, Cd, Mn, Ni, Zn and Pb in the eastern Emirates region. The analysis was carried out with FAAS spectroscopy using microwave digestion technique. The two mangrove plants are most abundant in this region. the bioconcentration factor (BCF) > 1 metal content was quantized. It …
Published in International Journal of Green Chemistry · Vol. 5, Issue 2, 2019 · pp. 1–8 Read article
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Refractometrically studies ofAtorvastatin drugs in various concentrationsof polar protic, aprotic and non-polar solvents at 303.150K.
Abstract: By using the refractometer to investigating the density and refractive index, molar refraction (Rm) and molar polarizability constant (a) at various concentration Atorvastatin heterocyclic drugs have been studied in ethanol, DMF and dioxane solvent at 303.150K.The magnitude of molar refraction (Rm) and molar polarizability constant (a) of Atorvastatindrug is observed to be higher in polar protic solvents like ethanol than polar aprotic solvents like DMF and non-polar solvents as like …
Published in International Journal of Analytical and Applied Chemistry · Vol. 9, Issue 2, 2023 · pp. 26–30 Read article
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Predicting the TPH Concentration along Horizontal Direction of Stagnated Water Contaminated with Crude Oil
Abstract: The research predicts and models TPH concentration along Horizontal Direction of Stagnated water contaminated with Crude Oil. TPH diffusion in the stagnant water media was studied using Developed Dispersion and Degradation Model incorporated with first order degradation rate and the Monod equation. TPH content decreased with increase in time, but randomly varied across the depths. The impact of crude oil was more in the fresh water compared to salt water …
Published in International Journal of Chemical Separation Technology · Vol. 9, Issue 1, 2023 · pp. 12–22 Read article