27 papers · ranked by Valyu relevance
Cássio Murakami
In the present paper, an analysis was performed on the torque-free motion of a rigid body, developing Euler's analytical solution and Poinsot's geometric solution. From mathematical formulations, the analytical solution for the time evolution of the angular velocity and Euler's angles was obtained and described given…
Fabien Salmon
The Navier-Stokes equations, which govern fluid motions, are not resolved yet. This investigation relates to the application of the power series method to the incompressible Navier-Stokes equations. This method involves replacing variables by power series in the equations. The resulting relations allow the computation…
Anton Sobinov, Sergiy Yakovenko
The coordinated activity of muscles is produced in part by spinal rhythmogenic neural circuits termed the central pattern generators (CPGs). A classical CPG model proposed conceptually by T.G. Brown in 1911 is a system of coupled oscillators transforming locomotor drive into coordinated and gait-specific patterns of…
Monica Correggia, Luciano Di Iorio, Alessia Benedicta Bastianoni, Mustafa Yucel + 2 more
This standard operating procedure (SOP) describes an ion chromatography (IC) procedure for the major cations and anions in hydrothermal fluids. Hydrothermal fluids are aqueous solutions with a wide range of temperature, salinity, pH and ion species that can be used by microbial metabolism as electron donors and…
Peng Xu
Monod and Logistic growth models have been widely used as basic equations to describe cell growth in bioprocess engineering. In the case for Monod equation, specific growth rate is governed by a limiting nutrient, with the mathematical form similar to the Michaelis-Menten equation. In the case for Logistic equation…
Byakatonda Denis
| ABSTRACT | iii | | --- | --- | | ORGANIZATION OF THE STUDY | iv | | LIST OF ABBREVIATIONS | v | | LIST OF SYMBOLS | vi | | LIST OF FIGURES | vii | | LIST OF TABLES | viii | | CHAPTER ONE 1 | | | INTRODUCTION 1 | | | 1.0 Introduction 1 | | | 1.1 Background of the study 1 | | | 1.2 Preliminaries 3 | | | 1.4 Statement…
Joshua T. Derrick, Pragney Deme, Norman Haughey, Steven A. Farber + 1 more
High-performance liquid chromatography (HPLC) is a common medium-throughput technique to quantify the components of often complex mixtures like those typically obtained from biological tissue extracts. However, analysis of HPLC data from complex multianalyte samples is hampered by a lack of tools to accurately…
Chaitanya Gupta, Kishan Aryasomayajula, Sean R. Fischer, Zheng Jia + 7 more
Analytical chemistry provides the content of nearly every scientific, technical and business decision relating to what atoms, molecules and devices are and how they interact in their environment. Various workflows come together in describing those interactions--separation, identification, quantitation…
Miguel Vasquez-Huaman, Américo Castro-Luna, Norma Julia Ramos-Cevallos, Donald Ramos-Perfecto + 4 more
'Norma Julia Ramos-Cevallos' 'Donald Ramos-Perfecto' 'Mario Alcarraz-Curi' 'Jacqueline Segura-Vasquez' 'Danny Cáceres-Antaurco' 'Elisabeth Eppard'] The goal of this study was to apply the principles of analytical quality by design (AQbD) to the analytical method for determining the radiochemical purity (PQR) of the…
Authors not listed
This paper introduces Post-Inspection Analysis (PIA), a concept for understanding and reverse engineering balanced equations of similar reactions. Here we explore the idea that balanced equations contain useable information observed by grouping and analysing similar equations, allowing us to uncover observations that…
Kerstin Thurow
Analytical measurement methods are used in different areas of production and quality control, diagnostics, environmental monitoring, or in research applications. If direct inline or online measurement methods are not possible, the samples taken have to be processed offline in the manual laboratory. Automated processes…
Lidong Cao, Xiuhuan Li, Li Fan, Li Zheng + 5 more
'Shanxue Zhang' 'Qiliang Huang' 'Hitoshi Sashiwa' 'David Harding'] Chitooligosaccharides (COSs) are a promising drug candidate and food ingredient because they are innately biocompatible, non-toxic, and non-allergenic to living tissues. Therefore, the impurities in COSs must be clearly elucidated and precisely…
Sabrina S. Ferreira, Rafaela S. Lamarca, Leandro S. Silva, Thiago A. L. Burgo + 5 more
for Preparation of Natural Deep Eutectic Solvents for Determination of As, Cd, and Pb in Plant Samples by ICP-MS Authors: ['Sabrina S. Ferreira' 'Rafaela S. Lamarca' 'Leandro S. Silva' 'Thiago A. L. Burgo' 'Paulo C. F. Lima Gomes' 'Clarice D. B. Amaral' 'Jose O. Fernandes' 'Sara C. Cunha' 'Mario H. Gonzalez'] Natural…
Alyssa Miller, Sean Chia, Zenon Toprakcioglu, Tuuli Hakala + 7 more
The study of the physical and chemical properties of biomolecules enables the characterisation of fundamental molecular processes and mechanisms in health and disease. Bulk and single-molecule analytical methods provide rich information on biomolecules, but often require high concentrations and sample preparation away…
Ritabrata Dutta
This paper features and elaborates recent developments and modifications in asymptotic techniques in solving differential equation in non linear dynamics. These methods are proved to be powerful to solve weakly as well as strongly non linear cases. Obtained approximate analytical solutions are valid for the whole…
Arindam Ghosh, Sarit Maitra, A. Roy Chowdhury
In this work the longitudinal wave equation through magneto-electro-elastic circular rod is studied analytically. Painlev´e test is performed to check integrability of the equation. Exact solitary wave solutions are found by homogeneous balance method and Tanh method and are plotted using suitable values of physical…
Sweta Acharya, Ankit Jain
A novel stability-indicating reverse-phase high-performance liquid chromatography (RP-HPLC) method was developed and validated for the quantification of baicalein (5,6,7-trihydroxyflavone) in bulk drug and nanoliposomal formulations. Samples were pretreated via dilution with mobile phase, membrane filtration (0.22 µm)…
Davide Ciccarelli, Tim Marczylo, Paolo Vineis, Leon Barron
A novel and generalisable analytical workflow for non-target analysis (NTA) and suspect screening (SS) of potentially toxic organic acids in drinking water is presented, featuring selective extraction by silica-based strong anion exchange solid-phase extraction (SAX-SPE), mixed-mode liquid chromatography-high…
Jingjing Liu, Yifei Xu, Shikun Liu, Shixin Yu + 2 more
'Sze Shin Low'] The voltammetric electrochemical sensing method combined with biosensors and multi-sensor systems can quickly, accurately, and reliably analyze the concentration of the main analyte and the overall characteristics of complex samples. Simultaneously, the high-dimensional voltammogram contains the rich…
Pablo Quijano Velasco, Kedar Hippalgaonkar, Balamurugan Ramalingam
The discovery of optimal conditions of chemical reactions is a labor-intensive, time-consuming task that requires exploring a high-dimensional parametric space. Historically the optimization of chemical reactions has been performed by manual experimentation guided by human intuition and Design of Experiments where one…
Elzbieta Jarosinska, Julia Wojnowska, Martyna Durka, Marta Podrażka + 1 more
Over the years, ion-selective electrodes (ISEs) have become routine means of analysis for industrial, environmental, and clinical applications, allowing for rapid, non-invasive, and easy disease monitoring and diagnostics. Their enormous advantages include wide dynamic range, ease of operation and low detector cost.…
Sofia Kakalejčíková, Yaroslav Bazeľ, Mária Drábiková, Maksym Fizer + 1 more
An environmentally friendly and highly sensitive analytical method for the determination of the dye Eosin Y (EY) was developed utilizing vortex-assisted liquid-liquid microextraction based on deep eutectic solvents (DESs), combined with fluorescence detection (LPME-FLD). The extraction efficiencies of conventional…
Authors not listed
Characterizing the chemical exposome relies on advanced instrumentation including tandem mass spectrometry coupled to liquid chromatography (LC-MS/MS), and non-targeted analysis (NTA) using high-resolution MS. How-ever, proper sample pretreatment, balancing broad analyte coverage, method robustness, and throughput…
Yixin Li, Xianliang Hu
A novel artificial neural network method is proposed for solving Cauchy inverse problems. It allows multiple hidden layers with arbitrary width and depth, which theoretically yields better approximations to the inverse problems. In this research, the existence and convergence are shown to establish the well-posedness…
Л. В. Сахарова, E. V. Shiryaeva, M. Yu. Zhukov
The mathematical model describing the stationary natural pH-gradient arising under the action of an electric field in an aqueous solution of ampholytes (amino acids) is constructed and investigated. The model is a part of a more general model of the isoelectrofocusing process. Investigation is based on the…
Alexander E. Yarawsky, Paola Cardenas Lopez, Johannes Walter, Michael T. DeLion + 1 more
Density gradient equilibrium analytical ultracentrifugation (DGE-AUC) was introduced in 1957 by Meselson, Stahl, and Vinograd. The method saw significant use for nucleic acids, proteins, synthetic polymers, and viruses throughout the 1960s and 1970s. Since then, DGE-AUC has seen continued use in the…
Marc Blétry
Buffer solutions are pervasive in chemistry, biochemistry, analytical chemistry, etc. A better understanding of buffer properties and what controls them is susceptible to be of interest in many scientific and technological fields. For instance, linear pH gradients are commonly used in electrophoresis and their…