Voltammetry of the aqueous complexation–dissociation coupled to transfer (ACDT) mechanism with charged ligands

2016 ◽  
Vol 18 (25) ◽  
pp. 17091-17104 ◽  
Author(s):  
Ángela Molina ◽  
José Manuel Olmos ◽  
Eduardo Laborda ◽  
José María Gómez-Gil ◽  
Joaquín González
Keyword(s):  
Analytical Solutions ◽  
Physicochemical Processes ◽  
Aqueous Complexation ◽  
Potential Signal ◽  
Ligand Species ◽  
Insight Into ◽  
Current Potential ◽  
Charged Ligands

The voltammetry of the ACDT mechanism shows different responses depending on whether the ligand species is neutral or charged. Analytical solutions are deduced to calculate the current–potential signal and gain insight into the physicochemical processes behind it.

scholarly journals Assessment of chicken breast shelf life based on bench-top and portable NIR spectroscopy tools coupled with chemometrics

2020 ◽  
Author(s):  
Ilaria Lanza ◽  
Daniele Conficoni ◽  
Stefania Balzan ◽  
Marco Cullere ◽  
Luca Fasolato ◽  
...  
Keyword(s):  
Discriminant Analysis ◽  
Shelf Life ◽  
Meat Quality ◽  
Near Infrared ◽  
Nir Spectroscopy ◽  
Life Assessment ◽  
Chicken Breast ◽  
Portable Devices ◽  
Physicochemical Processes ◽  
Insight Into

Abstract Near-infrared (NIR) spectroscopy is a rapid technique able to assess meat quality even if its capability to determine the shelf life of chicken fresh cuts is still debated, especially for portable devices. The aim of the study was to compare bench-top and portable NIR instruments in discriminating between four chicken breast refrigeration times (RT), coupled with multivariate classifier models. Ninety-six samples were analysed by both NIR tools at 2, 6, 10 and 14 days post-mortem. NIR data were subsequently submitted to partial least squares discriminant analysis (PLS-DA) and canonical discriminant analysis (CDA). The latter was preceded by double feature selection based on Boruta and Stepwise procedures. PLS-DA sorted moderate separation of RT theses, while shelf life assessment was more accurate on application of Stepwise-CDA. Bench-top tool had better performance than portable one, probably because it captured more informative spectral data as shown by the variable importance in projection (VIP) and restricted pool of Stepwise-CDA predictive scores (SPS). NIR tools coupled with a multivariate model provide deep insight into the physicochemical processes occurring during storage. Spectroscopy showed reliable effectiveness to recognise a 7-day shelf life threshold of breasts, suitable for routine at-line application for screening of meat quality.

Assessment of Aided-INS Performance

2011 ◽  
Vol 65 (1) ◽  
pp. 169-185 ◽  
Author(s):  
Itzik Klein ◽  
Sagi Filin ◽  
Tomer Toledo ◽  
Ilan Rusnak
Keyword(s):  
Closed Form ◽  
Analytical Solutions ◽  
Navigation Systems ◽  
Inertial Navigation Systems ◽  
Closed Form Solutions ◽  
Land Vehicles ◽  
Error Covariance ◽  
Model Dependency ◽  
Error State ◽  
Insight Into

Aided Inertial Navigation Systems (INS) systems are commonly implemented in land vehicles for a variety of applications. Several methods have been reported in the literature for evaluating aided INS performance. Yet, the INS error-state-model dependency on time and trajectory implies that no closed-form solutions exist for such evaluation. In this paper, we derive analytical solutions to evaluate the fusion performance. We show that the derived analytical solutions manage to predict the error covariance behavior of the full aided INS error model. These solutions bring insight into the effect of the various parameters involved in the fusion of the INS and an aiding sensor.

The Development of Computer Models for the Prediction of Factory Noise

1995 ◽  
Vol 2 (2) ◽  
pp. 437-454 ◽  
Author(s):  
S.M. Dance
Keyword(s):  
Mathematical Models ◽  
Ray Tracing ◽  
Computer Technology ◽  
Prediction Models ◽  
Noise Prediction ◽  
Image Source ◽  
The Past ◽  
Source Models ◽  
Insight Into ◽  
Current Potential

The development of factory noise prediction models over the past thirty years has parallelled the development of computer technology. There are currently two main approaches to this problem both of which have been extensively investigated, they are the image-source method and the ray-tracing technique. Presented are brief details of the background to the specific problems of factory noise prediction together with the various approaches used to solve the problem. An outline of how the two types of mathematical models work, together with details of their representational development is presented. A comparison of the current potential of each type of model, enabling an insight into when and where each type of model may be effectively used, is given. Three independent studies comparing various prediction models were considered. All three reviews drew the conclusion that the Ondet and Barbry, and the Lindqvist models were the most accurate ray-tracing and image-source models, respectively. Finally, a review of barrier prediction models is presented.

Low frequency bottom reverberation in a Pekeris waveguide with Lambert’s rule

2016 ◽  
Vol 24 (02) ◽  
pp. 1650001 ◽  
Author(s):  
Michael A. Ainslie ◽  
Dale D. Ellis ◽  
Chris H. Harrison
Keyword(s):  
Analytical Solutions ◽  
Time Window ◽  
Numerical Models ◽  
Low Frequency ◽  
University Of Texas ◽  
Pulse Transmission ◽  
Approximate Analytical Solutions ◽  
Pekeris Waveguide ◽  
The University ◽  
Insight Into

The requirement by modern navies to predict sonar performance in shallow water, whether for use in research, planning or operations, led to an initiative for the validation of reverberation models in the form of two Reverberation Modeling Workshops at the University of Texas at Austin in November 2006 and May 2008 [J. S. Perkins and E. I. Thorsos, Update on the reverberation modeling workshops, J. Acoust. Soc. Am. 126 (2009) 2208]. The problem considered here (Problem XI, from the 2006 workshop) requires the computation of reverberation versus time in a Pekeris waveguide with Lambert scattering from the seabed. Results from eigenray, normal mode and (hybrid) continuum methods are presented and compared for the time window 0.05[Formula: see text]s to 1000[Formula: see text]s after pulse transmission. Approximate analytical solutions are used to provide insight into the expected behavior of the reverberation and establish regimes of validity of numerical models. In situations where the regimes of validity of different methods coincide, the solutions of models applying these methods overlap. The overlapping solutions agree with each other within ±[Formula: see text]0.3[Formula: see text]dB. Their purpose is to provide a baseline against which future model improvements can be assessed and quantified.

ANALYTICAL SOLUTIONS OF NON-FOURIER PENNES AND CHEN–HOLMES EQUATIONS

2012 ◽  
Vol 05 (04) ◽  
pp. 1250022 ◽  
Author(s):  
WEIPING ZHU ◽  
FANGBAO TIAN ◽  
PENG RAN
Keyword(s):  
Heat Transfer ◽  
Analytical Solutions ◽  
Laplace Transformation ◽  
Solution Method ◽  
Thermal Relaxation ◽  
Blood Perfusion ◽  
Good Alternative ◽  
Tissue Temperature ◽  
Particular Solution ◽  
Insight Into

The analytical solutions of non-Fourier Pennes and Chen–Holmes equations are obtained using the Laplace transformation and particular solution method in the present paper. As an application, the effects of the thermal relaxation time τ, the blood perfusion wb, and the blood flow velocity v on the biological skin and inner tissue temperature T are studied in detail. The results obtained in this study provide a good alternative method to study the bio-heat and a biophysical insight into the understanding of the heat transfer in the biotissue.

Uncovering the impact of delay phenomenon on random walks in a family of weighted m-triangulation networks

2021 ◽  
pp. 2150234
Author(s):  
Junhao Guo ◽  
Zikai wu
Keyword(s):  
Random Walk ◽  
Random Walks ◽  
Analytical Solutions ◽  
Network Models ◽  
Trapping Efficiency ◽  
Trapping Time ◽  
Delay Phenomenon ◽  
The Impact ◽  
Insight Into ◽  
Trapping Process

Uncovering the impact of special phenomena on dynamical processes in more distinct weighted network models is still needed. In this paper, we investigate the impact of delay phenomenon on random walk by introducing delayed random walk into a family of weighted m-triangulation networks. Specifically, we introduce delayed random walk into the networks. Then one and three traps are deployed, respectively, on the networks in two rounds of investigation. In both rounds of investigation, average trapping time (ATT) is applied to measure trapping efficiency and derived analytically by harnessing iteration rule of the networks. The analytical solutions of ATT obtained in both investigations show that ATT increases sub-linearity with the size of the network no matter what value the parameter [Formula: see text] manipulating delayed random walk takes. But [Formula: see text] can quantitatively change both its leading scaling and prefactor. So, introduction of delay phenomenon can control trapping efficiency quantitatively. Besides, parameters [Formula: see text] and [Formula: see text] governing networks’ evolution quantitatively impact both the prefactor and leading scaling of ATT simultaneously. In summary, this work may provide incremental insight into understanding the impact of observed phenomena on special trapping process and general random walks in complex systems.

scholarly journals Effects of gold nanoparticles on the photophysical and photosynthetic parameters of leaves and chloroplasts

2018 ◽  
Vol 17 (4) ◽  
pp. 505-516 ◽  
Author(s):  
Rocio Torres ◽  
Virginia E. Diz ◽  
M. Gabriela Lagorio
Keyword(s):  
Gold Nanoparticles ◽  
Photosynthetic Parameters ◽  
Deep Insight ◽  
Physicochemical Processes ◽  
Insight Into

Interaction between light and plants containing gold nanoparticles: a deep insight into the physicochemical processes taking place.

scholarly journals Colloidal transport and flocculation are the cause of the hyperenrichment of gold in nature

2021 ◽  
Vol 118 (20) ◽  
pp. e2100689118
Author(s):  
Duncan F. McLeish ◽  
Anthony E. Williams-Jones ◽  
Olga V. Vasyukova ◽  
James R. Clark ◽  
Warwick S. Board
Keyword(s):  
Colloidal Particles ◽  
Direct Evidence ◽  
Weight Percent ◽  
Gold Deposits ◽  
High Grade ◽  
Colloidal Transport ◽  
Gold Particles ◽  
Aqueous Complexation ◽  
Insight Into ◽  
Gold Bearing

Aqueous complexation has long been considered the only viable means of transporting gold to depositional sites in hydrothermal ore-forming systems. A major weakness of this hypothesis is that it cannot readily explain the formation of ultrahigh-grade gold veins. This is a consequence of the relatively low gold concentrations typical of ore fluids (tens of parts per billion [ppb]) and the fact that these “bonanza” veins can contain weight-percent levels of gold in some epithermal and orogenic deposits. Here, we present direct evidence for a hypothesis that could explain these veins, namely, the transport of the gold as colloidal particles and their flocculation in nanoscale calcite veinlets. These gold-bearing nanoveinlets bear a remarkable resemblance to centimeter-scale ore veins in many hydrothermal gold deposits and give unique insight into the scale invariability of colloidal flocculation in forming hyperenriched gold deposits. Using this evidence, we propose a model for the development of bonanza gold veins in high-grade deposits. We argue that gold transport in these systems is largely mechanical and is the result of exceptionally high degrees of supersaturation that preclude precipitation of gold crystals and instead lead to the formation of colloidal particles, which flocculate and form much larger masses. These flocculated masses aggregate locally, where they are seismically pumped into fractures to locally form veins composed largely of gold. This model explains how bonanza veins may form from fluids containing ppb concentrations of gold and does not require prior encapsulation of colloidal gold particles in silica gel, as proposed by previous studies.

scholarly journals SETD7-mediated lysine monomethylation is abundant on non-hyperphosphorylated nuclear Tau

2020 ◽  
Author(s):  
Maria Bichmann ◽  
Nuria Prat Oriol ◽  
Ebru Ercan-Herbst ◽  
David C. Schöndorf ◽  
Borja Gomez Ramos ◽  
...  
Keyword(s):  
Soluble Fraction ◽  
Nuclear Fraction ◽  
Neuronal Dysfunction ◽  
Methylation Site ◽  
Post Translational Modification ◽  
Age Dependent ◽  
Lysine Methyltransferase ◽  
Potential Signal ◽  
Insight Into ◽  
Shed Light

AbstractHuman tauopathies including Alzheimer’s disease (AD) are characterized by alterations in the post-translational modification (PTM) pattern of Tau, leading to the formation of insoluble aggregates, neuronal dysfunction and degeneration. Using a mass spectrometry approach, we identified multiple sites of lysine monomethylation on Tau isolated from a detergent-soluble fraction of human brain, some of which were increased in early AD samples. Brain tissues derived from a mouse model of tauopathy demonstrate an age-dependent increase in methylation at specific sites, with methylated Tau enriched in the soluble nuclear fraction and not associated with hyperphosphorylated, insoluble Tau species. Furthermore, we show that the protein lysine methyltransferase SETD7 methylates Tau at K132 and demonstrate an interaction with K130, an additional methylation site in close vicinity. These findings shed light on the function of a novel type of PTM on Tau that provide a potential signal for its translocation to different subcellular sites. Since the mislocalization and depletion of Tau from axons is associated with tauopathies, our findings may furthermore provide insight into this disease-associated phenomenon.

scholarly journals Survey of Some Exact and Approximate Analytical Solutions for Heat Transfer in Extended Surfaces

2021 ◽  
Author(s):  
Raseelo Joel Moitsheki ◽  
Partner Luyanda Ndlovu ◽  
Basetsana Pauline Ntsime
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Thermal Properties ◽  
Analytical Solutions ◽  
Nonlinear Problems ◽  
Transient Heat Transfer ◽  
Temperature Dependent ◽  
Approximate Analytical Solutions ◽  
Extended Surfaces ◽  
Insight Into

In this chapter we provide the review and a narrative of some obtained results for steady and transient heat transfer though extended surfaces (fins). A particular attention is given to exact and approximate analytical solutions of models describing heat transfer under various conditions, for example, when thermal conductivity and heat transfer are temperature dependent. We also consider fins of different profiles and shapes. The dependence of thermal properties render the considered models nonlinear, and this adds a complication and difficulty to solve these model exactly. However, the nonlinear problems are more realistic and physically sound. The approximate analytical solutions give insight into heat transfer in fins and as such assist in the designs for better efficiencies and effectiveness.

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