scholarly journals Modelling Organic Gel Growth in Three Dimensions: Textural and Fractal Properties of Resorcinol–Formaldehyde Gels

Gels ◽  
2020 ◽  
Vol 6 (3) ◽  
pp. 23
Author(s):  
Elisha Martin ◽  
Martin Prostredny ◽  
Ashleigh Fletcher ◽  
Paul Mulheran
Keyword(s):  
Correlation Dimension ◽  
Catalyst Concentration ◽  
Textural Properties ◽  
Diffusion Path ◽  
Three Dimensions ◽  
Porous Network ◽  
Resorcinol Formaldehyde ◽  
Fractal Properties ◽  
Solids Content ◽  
The Impact

Tailoring the properties of porous organic materials, such as resorcinol–formaldehyde gels, for use in various applications has been a central focus for many studies in recent years. In order to achieve effective optimisation for each application, this work aims to assess the impact of the various synthesis parameters on the final textural properties of the gel. Here, the formation of porous organic gels is modelled using a three-dimensional lattice-based Monte Carlo simulation. We model growth from monomer species into the interconnected primary clusters of a gel, and account for varying catalyst concentration and solids content, two parameters proven to control gel properties in experimental work. In addition to analysing the textural properties of the simulated materials, we also explore their fractal properties through correlation dimension and Hurst exponent calculations. The correlation dimension shows that while fractal properties are not typically observed in scattering experiments, they are possible to achieve with sufficiently low solids content and catalyst concentration. Furthermore, fractal properties are also apparent from the analysis of the diffusion path of guest species through the gel’s porous network. This model, therefore, provides insight into how porous organic gels can be manufactured with their textural and fractal properties computationally tailored according to the intended application.

scholarly journals The Role of Cations in Resorcinol–Formaldehyde Gel Textural Characteristics

Gels ◽  
2022 ◽  
Vol 8 (1) ◽  
pp. 60
Author(s):  
Stewart J. Taylor ◽  
Liu Yang ◽  
Ashleigh J. Fletcher
Keyword(s):  
Pore Size ◽  
Pore Diameter ◽  
Textural Properties ◽  
Average Pore ◽  
Salting Out ◽  
Resorcinol Formaldehyde ◽  
Catalyst Composition ◽  
Solids Content ◽  
Insight Into

The production of resorcinol–formaldehyde xerogels has yielded insight into the gelation processes underpinning their structures. In this work, the role of the cation species from the catalyst is probed by studying the simultaneous addition of sodium carbonate and calcium carbonate to a resorcinol–formaldehyde mixture. Twenty-eight xerogels were prepared by varying the solids content, catalyst concentration, and catalyst composition, and each was analysed for its textural properties, including the surface area and average pore diameter. The results indicate that the role of the cation is linked to the stabilisation of the clusters formed within the system, and that the Group II catalyst causes the salting out of the oligomers, resulting in fewer, larger clusters, hence, an increase in pore size and a broadening of the pore size distribution. The results provide insight into how these systems can be further controlled to create tailored porous materials for a range of applications.

Method development for the determination of textural properties of sugar beet roots

2019 ◽  
pp. 392-400 ◽  
Author(s):  
Gunnar Kleuker ◽  
Christa M. Hoffmann
Keyword(s):  
Sugar Beet ◽  
Compression Test ◽  
Storage Period ◽  
Textural Properties ◽  
Small Sample ◽  
Root Tip ◽  
Flexural Test ◽  
Sample Distribution ◽  
The Impact

The harvest of sugar beet leads to root tip breakage and surface damage through mechanical impacts, which increase storage losses. For the determination of textural properties of sugar beet roots with a texture analyzer a reliable method description is missing. This study aimed to evaluate the impact of washing, soil tare, storage period from washing until measurement, sample distribution and number of roots on puncture and compression measurements. For this purpose, in 2017 comprehensive tests were conducted with sugar beet roots grown in a greenhouse. In a second step these tests were carried out with different Beta varieties from a field trial, and in addition, a flexural test was included. Results show that the storage period after washing and the sample distribution had an influence on the puncture and compression strength. It is suggested to wash the roots by hand before the measurement and to determine the strength no later than 48 h after washing. For reliable and comparable results a radial distribution of measurement points around the widest circumference of the root is recommended for the puncture test. The sample position of the compression test had an influence on the compressive strength and therefore, needs to be clearly defined. For the puncture and the compression test it was possible to achieve stable results with a small sample size, but with increasing heterogeneity of the plant stand a higher number of roots is required. The flexural test showed a high variability and is, therefore, not recommended for the analysis of sugar beet textural properties.

An empirical examination of firm financial performance along dimensions of supply chain resilience

2017 ◽  
Vol 40 (3) ◽  
pp. 254-269 ◽  
Author(s):  
Xun Li ◽  
Qun Wu ◽  
Clyde W. Holsapple ◽  
Thomas Goldsby
Keyword(s):  
Supply Chain ◽  
Financial Performance ◽  
Three Dimensions ◽  
Empirical Examination ◽  
Content Type ◽  
Supply Chain Resilience ◽  
Critical Dimensions ◽  
Firm Financial Performance ◽  
Supply Chain Agility ◽  
The Impact

Purpose This paper aims to investigate the impact of three critical dimensions of supply chain resilience, supply chain preparedness, supply chain alertness and supply chain agility, all aimed at increasing a firm’s financial outcomes. In a turbulent environment, firms require resilience in their supply chains to prepare for potential changes, detect changes and respond to actual changes, thus providing superior value. Design/methodology/approach Using survey data from 77 firms, this study develops scales for preparedness, alertness and agility. It then tests their hypothesized relationships with a firm’s financial performance. Findings The results reveal that the three dimensions of supply chain resilience (i.e. preparedness, alertness and agility) significantly impact a firm’s financial performance. It is also found that supply chain preparedness, as a proactive resilience capability, has a greater influence on a firm’s financial performance than the reactive capabilities including alertness and agility, suggesting that firms should pay more attention to proactive approaches for building supply chain resilience. Originality/value First, this study develops a comparatively comprehensive definition for supply chain resilience and explores its dimensionality. Second, this study provides empirically validated instruments for the dimensions of supply chain resilience. Third, this study is one of the first to provide empirical evidence for direct impact of supply chain resilience dimensions on a firm’s financial performance.

EFFECTS OF TREND AND PERIODICITY ON THE CORRELATION DIMENSION AND THE LYAPUNOV EXPONENTS

2008 ◽  
Vol 18 (12) ◽  
pp. 3679-3687 ◽  
Author(s):  
AYDIN A. CECEN ◽  
CAHIT ERKAL
Keyword(s):  
Time Series ◽  
Lyapunov Exponent ◽  
Lyapunov Exponents ◽  
Correlation Dimension ◽  
Time Series Data ◽  
Logistic Map ◽  
Model Identification ◽  
Series Data ◽  
Largest Lyapunov Exponent ◽  
The Impact

We present a critical remark on the pitfalls of calculating the correlation dimension and the largest Lyapunov exponent from time series data when trend and periodicity exist. We consider a special case where a time series Zi can be expressed as the sum of two subsystems so that Zi = Xi + Yi and at least one of the subsystems is deterministic. We show that if the trend and periodicity are not properly removed, correlation dimension and Lyapunov exponent estimations yield misleading results, which can severely compromise the results of diagnostic tests and model identification. We also establish an analytic relationship between the largest Lyapunov exponents of the subsystems and that of the whole system. In addition, the impact of a periodic parameter perturbation on the Lyapunov exponent for the logistic map and the Lorenz system is discussed.

scholarly journals The Effect of Fat Content and Fatty Acids Composition on Color and Textural Properties of Butter

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4565
Author(s):  
Sergiu Pădureţ
Keyword(s):  
Fatty Acids ◽  
Principal Component ◽  
Textural Properties ◽  
Fat Content ◽  
Fatty Acids Composition ◽  
Color Parameter ◽  
Butter Fat ◽  
Composition Variation ◽  
Texture Parameters ◽  
The Impact

The textural properties of butter are influenced by its fat content and implicitly by the fatty acids composition. The impact of butter’s chemical composition variation was studied in accordance with texture and color properties. From 37 fatty acids examined, only 18 were quantified in the analyzed butter fat samples, and approximately 69.120% were saturated, 25.482% were monounsaturated, and 5.301% were polyunsaturated. The butter samples’ viscosity ranged between 0.24 and 2.12 N, while the adhesiveness ranged between 0.286 to 18.19 N·mm. The principal component analysis (PCA) separated the butter samples based on texture parameters, fatty acids concentration, and fat content, which were in contrast with water content. Of the measured color parameters, the yellowness b* color parameter is a relevant indicator that differentiated the analyzed sample into seven statistical groups; the ANOVA statistics highlighted this difference at a level of p < 0.001.

Back to the Westminster model? The Brexit process and the UK political system

2021 ◽  
pp. 019251212096737
Author(s):  
Gianfranco Baldini ◽  
Edoardo Bressanelli ◽  
Emanuele Massetti
Keyword(s):  
Political System ◽  
Party System ◽  
Political Process ◽  
Three Dimensions ◽  
Executive Power ◽  
The Political ◽  
Westminster Model ◽  
The Uk ◽  
Quantitative Indicators ◽  
The Impact

This article investigates the impact of Brexit on the British political system. By critically engaging with the conceptualisation of the Westminster model proposed by Arend Lijphart, it analyses the strains of Brexit on three dimensions developed from from Lijphart’s framework: elections and the party system, executive– legislative dynamics and the relationship between central and devolved administrations. Supplementing quantitative indicators with an in-depth qualitative analysis, the article shows that the process of Brexit has ultimately reaffirmed, with some important caveats, key features of the Westminster model: the resilience of the two-party system, executive dominance over Parliament and the unitary character of the political system. Inheriting a context marked by the progressive weakening of key majoritarian features of the political system, the Brexit process has brought back some of the traditional executive power-hoarding dynamics. Yet, this prevailing trend has created strains and resistances that keep the political process open to different developments.

scholarly journals Exploring Residents’ Perceptions of the Socio-Cultural Benefits of Tourism Development in the Mountain Area

Societies ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 83
Author(s):  
Iulia C. Muresan ◽  
Rezhen Harun ◽  
Felix H. Arion ◽  
Ava Omar Fatah ◽  
Diana E. Dumitras
Keyword(s):  
Positive Attitude ◽  
Statistical Tests ◽  
Tourism Development ◽  
Principal Component ◽  
Local Communities ◽  
Three Dimensions ◽  
Development Economic ◽  
Mountain Area ◽  
Sustainable Tourism Development ◽  
The Impact

Development of tourism affected the socio-cultural environment of many destinations. Previous studies have focused more on analyzing the impact of tourism on all three dimensions of sustainable development (economic, environment and socio-cultural); therefore, the present paper examines tourism development’s impact with regard to the socio-cultural benefits that enhance sustainable tourism development. A survey based on a questionnaire was employed in June 2018 in a mountain village in Cluj County, Romania. The collected data were analyzed using principal component analysis, and several statistical tests were conducted. The results indicated that the respondents have a positive attitude towards tourism development and socio-cultural perceived benefits. Older people and those running a business tend to perceive more positively the benefits of tourism development. The findings of the research could contribute to future development strategies, as it is well known that supporting local communities influences the success of tourism destination.

scholarly journals How Loan Bank of Assistive Technology Impacts on Life of Persons with Amyotrophic Lateral Sclerosis and Neuromuscular Diseases: A Collaborative Initiative

2021 ◽  
Vol 18 (2) ◽  
pp. 763
Author(s):  
Thais Pousada ◽  
Jessica Garabal-Barbeira ◽  
Cristina Martínez ◽  
Betania Groba ◽  
Laura Nieto-Riveiro ◽  
...  
Keyword(s):  
Amyotrophic Lateral Sclerosis ◽  
Assistive Technology ◽  
Positive Impact ◽  
Outcome Measurement ◽  
Neuromuscular Diseases ◽  
Three Dimensions ◽  
Assistive Device ◽  
Cross Sectional ◽  
The Impact ◽  
Lateral Sclerosis

(1) Background: The study is focused on the implementation of outcome measurement tools to assess the impact of an assistive device from a loan bank in the lives of people with Amyotrophic Lateral Sclerosis and Neuromuscular Diseases. The secondary purpose is to analyse the correct matching between the person and technology, derived from the counselling of an occupational therapist. (2) Methods: Cross-sectional study. The sample was formed by 28 people with rare neurodegenerative disorders. A specific questionnaire, the Psychosocial Impact of Assistive Device Scale (PIADS), and the Matching Person and Technology (MPT) tool were applied to collect the data. (3) Results: The dimension of the PIADS with the best score was competence, and the variations according to gender were not remarkable. The three dimensions of the PIADS (competence, adaptability, and self-esteem) were correlated positively between them and with the mean score of the MPT tool (p < 0.01). The type of assistive technology (AT), diagnosis, and correct match between person–technology are the main factors that condition a positive impact. (4) Conclusions: The results noted the importance of assessing the needs, demands, and contexts of people with rare neurodegenerative diseases to prescribe the best AT. Loan banks of AT have to be considered a valid service that complements their lack in public health services.

Post-traumatic Growth: Longitudinal Study on Battered Women in Close Relationships after Both They and Their Partners Undergo Therapy

2021 ◽  
pp. 088626052199793
Author(s):  
Dorota Dyjakon ◽  
Beata Rajba
Keyword(s):  
Battered Women ◽  
Three Dimensions ◽  
Traumatic Experiences ◽  
Important Indicator ◽  
Event Scale ◽  
Post Traumatic Growth ◽  
Polish Version ◽  
Close Relationship ◽  
Post Traumatic ◽  
The Impact

Violence in intimate relationships is a major problem worldwide. Many women, despite having experienced violence from a partner, decide to remain in a relationship with the perpetrator. A special premise for such a decision is that the abusive partner undertakes therapy that serves to build security in the family. An important indicator of dealing with violence is post-traumatic growth (PTG), a concept introduced by Calhoun and Tedeschi (1998) to describe positive changes as a result of traumatic experiences. The purpose of the research was to assess PTG changes in the course of relationships in which the woman had experienced violence from her partner, but both her partner and she had undertaken therapy and changed their behavior ( N = 48). The conducted research used a demographic survey and two questionnaires: The Polish version of the Impact Event Scale-Revised (IES-R, Weiss, Marmara prepared by Juczyński and Ogińska-Bulik [2009]) examining three dimensions of trauma (intrusion, hyperarousal, and avoidance) and the Post-traumatic Growth Inventory ( Tedeschi & Calhoun [2004] ; Polish version prepared by Ogińska-Bulik & Juczyński [2010] ). The studies showed that over a period of one and half years, significant changes in PTG had taken place. Reportedly, changes in self-perception and changes in relating to others have decreased, while appreciation of life increased but spiritual life remained the same. The research also allowed us to distinguish several groups of corelates in changes in individual PTG categories. The studies also indicate that building a close relationship with the person who caused the harm can limit the victim’s PTG.

Dependence of Diffusion Paths on Thermodynamic Factors in Ternary Systems

2008 ◽  
Vol 277 ◽  
pp. 119-124 ◽  
Author(s):  
Ü. Ugaste ◽  
J. Priimets ◽  
Tony Laas
Keyword(s):  
Approximate Equation ◽  
Ternary Systems ◽  
Diffusion Path ◽  
Tracer Diffusion ◽  
Diffusion Paths ◽  
Slope Function ◽  
Experimental Values ◽  
The Impact ◽  
Tracer Diffusion Coefficients ◽  
Thermodynamic Factors

The impact of thermodynamic factors on deviation from linearity of diffusion path in the ternary system Cu-Fe-Ni is analyzed. For that the slope function of the diffusion path for the diffusion couples 65Ni30Cu5Fe –29.5Ni16.5Cu54Fe, 49.5Ni50.5Fe – 51Ni49Cu and 84Cu16Ni – 50Ni50Fe, annealed at 1000°C for 196h, were calculated by an approximate equation using only thermodynamic data. Results of the calculation were compared with the values of the slope function obtained directly from experimental data. It is shown that despite of the fact that the tracer diffusion coefficients of the components in the system Cu-Fe-Ni are not equal the coincidence between the calculated and experimental values of the slope function is remarkable. This allows us to conclude that at least in this case the deviation of the diffusion path from linearity depends mainly on the thermodynamic properties of the system.

Sign in / Sign up

Export Citation Format

Share Document