scholarly journals Molecular spectroscopy of aqueous solutions: a theoretical perspective

2020 ◽  
Vol 49 (16) ◽  
pp. 5664-5677 ◽  
Author(s):  
Tommaso Giovannini ◽  
Franco Egidi ◽  
Chiara Cappelli
Keyword(s):  
Theoretical Model ◽  
Aqueous Solutions ◽  
Molecular Spectroscopy ◽  
Theoretical Perspective ◽  
Computational Technique ◽  
Aqueous Systems

We review a mixed quantum-classical theoretical model and computational technique designed to accurately reproduce spectral signals of aqueous systems and provide a rationalization for the underlying physics.

scholarly journals Coaching in design-based learning: a grounded theory approach to create a theoretical model and practical propositions

2019 ◽  
Author(s):  
M. R. van Diggelen ◽  
K. I. Doulougeri ◽  
S. M. Gomez-Puente ◽  
G. Bombaerts ◽  
K. J. H. Dirkx ◽  
...  
Keyword(s):  
Grounded Theory ◽  
Theoretical Model ◽  
Qualitative Study ◽  
Formative Assessment ◽  
Theoretical Perspective ◽  
Problem Based Learning ◽  
Theory Approach ◽  
Coaching Model ◽  
Teachers And Students ◽  
Grounded Theory Approach

Abstract The purpose of this study is to determine what good coaching during design-based learning (DBL) entails by integrating theoretical and practical perspectives on good coaching. For this purpose, a grounded theory approach was used. For the practical perspective, themes on good coaching were derived from a qualitative study on coaching by observing and interviewing teachers and students involved in a DBL project. For the theoretical perspective, we consulted and analyzed literature on scaffolding, feedback, and formative assessment and coaching in problem-based learning from the learning sciences and the studio model from arts and design literature. Synthesizing themes from both perspectives led to the development of a theoretical coaching model consisting of three main categories (and four subcategories), seventeen themes and thirteen propositions. The model and propositions might be of use for those involved in coaching students in DBL and provide relevant directions for research on coaching in DBL.

scholarly journals Measurement and Prediction of Densities of Ternary Aqueous Mixtures Involving Sodium Polyacrylate

2004 ◽  
Vol 4 (1) ◽  
pp. 64
Author(s):  
Z. A. Noor Fadzlina ◽  
T. T. Teng ◽  
M. Abdul Rahman
Keyword(s):  
Experimental Data ◽  
Aqueous Solutions ◽  
Percentage Error ◽  
Sodium Polyacrylate ◽  
Aqueous Systems ◽  
Aqueous Mixtures ◽  
Density Prediction ◽  
Density Values ◽  
Good Agreement

The densities of the binary aqueous solutions of sodium polyacrylate (NaPM) at 20°C, 25°C, and 300C up to 0.17 m and LiCI at 25°C and 300C up to 3.13 m were measured using a vibrating tube digital densitimeter. The measured experimental data were then fitted to the polynomial d = do + IA;m'. The densities of the ternary aqueous systems NaPM-NaCI, NaPM-LiCI, and NaPM-sucrose were also =1 measured from 20°C to 30°C. The isopycnotic equation, Imi / moi was used to predict the densities of the ternary aqueous systems mentioned. The results show that predicted and observed density values are in good agreement. The overall percentage error of density prediction for the system NaPM-NaCI-H20 is 0.067. For the system NaPM-LiCI-HP,the overall percentage error is 0.074; and, for the system NaPM-sucrose-H20, the overall percentage error is 0.065.

Distribution of Triclocarban in Natural Aqueous Systems Amended with Carbon Nanomaterials

2021 ◽  
Vol 21 (4) ◽  
pp. 2368-2375
Author(s):  
I. Ion ◽  
G. R. Ivan ◽  
A. C. Ion
Keyword(s):  
Aqueous Solutions ◽  
Natural Water ◽  
Carbon Nanomaterials ◽  
Chemical Compositions ◽  
Aqueous Systems

In this work, the sorption of TCC in natural aqueous solutions with different chemical compositions, on amended sediments with carbon nanomaterials such as MWCNTs and C60, pristine and weathered is presented. The variation of the temperature, the composition of the natural water, the compositions of the sediment were studied, the results were correlated for a better understanding of the possible effects of the carbon nanomaterials in the environment.

A qualitative phenomenological exploration of social mood and investors’ risk tolerance in an emerging economy

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Humaira Asad ◽  
Iqra Toqeer ◽  
Khalid Mahmood
Keyword(s):  
Theoretical Model ◽  
Thematic Analysis ◽  
Financial Literacy ◽  
Financial Risk ◽  
Theoretical Perspective ◽  
Emerging Economy ◽  
Risk Tolerance ◽  
Validity And Reliability ◽  
Content Type ◽  
Depth Analysis

Purpose The authors design a theoretical perspective that explores how different phases of social mood influence financial risk tolerance (FRT) among investors. Risk is involved in almost all financial decision-making. For a better understanding of risk tolerance behavior, the role played by social mood cannot be ignored. This study aims to explore the linkage between social mood and FRT of investors in Pakistan. Design/methodology/approach Using qualitative phenomenology as the guiding framework, 22 interviews were conducted to have a deeper understanding of the lived experiences of investors with at least 10 years of investment experience. Thematic analysis was done to analyze data. Audio-recording, bracketing, triangulation and member checking were done to ensure validity and reliability. Findings A theoretical model is developed using the six themes identified through thematic analysis. This model presents an in-depth analysis of the determinants of social mood, its multiple phases and its impact on risk tolerance behavior. Findings reveal that the level of financial literacy, experience and purpose of investment moderate the effect of social mood on FRT. Practical implications Investors can manage risk and increase their profits by controlling the effects of social mood. They can benefit from the market situation by taking more risk when the market is extremely low. The advisors can frame their advice in the light of the model. Originality/value According to the authors’ knowledge, this is the first study that explores investors’ risk tolerance in response to variations in social mood in the context of an emerging economy. The paper has contributed conceptually and methodologically. It uses phenomenology as the method and develops a theoretical model that describes how different types of investors adjust their risk tolerance in response to changes in their social mood.

scholarly journals Molecular Interaction of Aqueous Solution of 1-Propanol and 2-Propanol

2019 ◽  
Vol 35 (2) ◽  
pp. 901-904
Author(s):  
Sandhya Sharma ◽  
N. D. Kandpal ◽  
R. Joshi
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Molecular Interaction ◽  
Aqueous Systems ◽  
Solvent Interaction ◽  
Solvent Type ◽  
Type Interaction ◽  
Alcohol System ◽  
Solute Solvent Interaction ◽  
Water Alcohol

Viscosities (ƞ) of solutions of 1- propanol and 2-propanol have been determined in aqueous systems of varying composition (0.16-3.64 mol dm-3) at 298 K. The ƞ/ƞ0 data have been analyzed in the light of reduced Jone-Dole equation ƞ/ƞ0 = BC+1. The results in the regards to solute-solvent interaction in aqueous solutions of both the alcohols have been discussed in the terms of the value B. The result of study reveals that both the alcohols behave as the structure makers in the water. The result shows that solute-solvent type interaction of same magnitude exists in water-alcohol system.

Formation and Properties of Americium Colloids in Aqueous Systems

1981 ◽  
Vol 6 ◽  
Author(s):  
U. Olofsson ◽  
B. Allard ◽  
K. Andersson ◽  
B. Torstenfelt
Keyword(s):  
Ionic Strength ◽  
Aqueous Solutions ◽  
Storage Time ◽  
Large Fraction ◽  
Average Charge ◽  
Particle Sizes ◽  
Aqueous Systems ◽  
Ph Range ◽  
And Storage ◽  
Solution Changes

ABSTRACTThe formation and sorption properties of colloidal americium in aqueous solutions have been studied with variations of pH (2–12), ionic strength (0.01–1.0 M NaClO4), americium concentration (10−7 −10−11 M) and storage time (6 h–6 months). A large fraction of the americium is sorbed on the container walls or on Al2O3 in the pH-range 7–11. Around pH 5–8 and at pH above 12 centrifugable fractions (particle sizes greater than 100 nm) are obtained. The fraction formed at pH above 12, which seems to be a true hydroxide colloid, migrates through an A12O3-filled column with very little retention. The average charge of americium species in solution changes from positive values at pH below 7–8 to negative values at pH above 10–11, as indicated from electromigration studies.

DIFFUSION IN MULTICOMPONENT AQUEOUS SYSTEMS

1966 ◽  
Vol 44 (4) ◽  
pp. 477-485 ◽  
Author(s):  
J. E. Lane ◽  
J. S. Kirkaldy
Keyword(s):  
Aqueous Solutions ◽  
Relative Viscosity ◽  
Ionic Species ◽  
Aqueous Systems ◽  
Vacancy Model ◽  
High Concentrations ◽  
Substitutional Alloys ◽  
Good Agreement

A vacancy model, originally developed for the description of diffusion in substitutional alloys, is modified for application to aqueous solutions, including those containing ionic species. The results obtained with this model are similar to those of two recently published methods for estimating L-coefficients in dilute multicomponent liquid systems.Agreement with experimental L-coefficients at relatively high concentrations can be improved for this model by assuming that the jump probability of a diffusing species is inversely proportional to the relative viscosity of the mixture. Good agreement is then found for some systems up to combined solute concentrations of 3 M.

SEMANTIC FIELD: A THEORETICAL PERSPECTIVE OF MODELING INFORMATION RETRIEVAL

2009 ◽  
Vol 18 (06) ◽  
pp. 825-851
Author(s):  
KUN YUE ◽  
WEI-YI LIU
Keyword(s):  
Information Retrieval ◽  
Theoretical Model ◽  
Electrostatic Field ◽  
Real World ◽  
Field Model ◽  
Theoretical Perspective ◽  
Keyword Extraction ◽  
Semantic Field ◽  
Novel Method ◽  
Interpretable Model

Information retrieval has been paid much attention and it is widely studied and applied in real world paradigms. For various aspects of information retrieval, various approaches have been proposed from various perspectives. It is necessary to provide a formally-unified and physically-interpretable model for classical problems in information retrieval (e.g., document classification, authority-page selection, and keyword extraction, etc.). In this paper we propose a theoretical model, called semantic field, inspired by the theories of lexical semantics and electrostatic field. Based on this physical model, information retrieval can be viewed from a theoretical perspective and interpreted by people's physical intuitions and natural heuristics. Centered on the concept of semantic field, we give some relevant properties, including semantic affinity, semantic coacervation degree and radiation of a semantic source. As the representative application of the proposed semantic field model, a novel method for automatic keyword extraction is discussed, and the feasibility is verified by corresponding experiments.

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