scholarly journals Influence of the mode of reproduction on dispersal evolution during species invasion

2020 ◽  
Vol 67 ◽  
pp. 120-134
Author(s):  
Vincent Calvez ◽  
Joachim Crevat ◽  
Léonard Dekens ◽  
Benoit Fabrèges ◽  
Frédéric Kuczma ◽  
...  
Keyword(s):  
Sexual Reproduction ◽  
Formal Analysis ◽  
Propagation Speed ◽  
Reaction Diffusion ◽  
Equation Modeling ◽  
Asexual Population ◽  
Acceleration Rate ◽  
Non Local ◽  
The Difference ◽  
Dispersal Evolution

We consider a reaction-diffusion-reproduction equation, modeling a population which is spatially heterogeneous. The dispersion of each individuals is influenced by its phenotype. In the literature, the asymptotic propagation speed of an asexual population has already been rigorously determined. In this paper we focus on the difference between the asexual reproduction case, and the sexual reproduction case, involving a non-local term modeling the reproduction. This comparison leads to a different invasion speed according to the reproduction. After a formal analysis of both cases, leading to a heuristic of the asymptotic behaviour of the invasion fronts, we give some numerical evidence that the acceleration rate of the spatial spreading of a sexual population is slower than the acceleration rate of an asexual one. The main difficulty to get sharper results on a transient comes from the non-local sexual reproduction term.

Understanding Customers' Continuance Intention

2021 ◽  
Vol 52 (2) ◽  
pp. 68-93
Author(s):  
Bangaly Kaba
Keyword(s):  
Information And Communication Technologies ◽  
Structural Equation ◽  
Service Providers ◽  
Equation Modeling ◽  
Continuance Intention ◽  
Internet Service ◽  
Digital Inequality ◽  
Internet Users ◽  
The Difference ◽  
Use Behavior

The purpose of this study is to understand the difference between Internet users' continuing use behavior in the context of digital inequality. Data were collected through a survey of Internet users in the Ivory Coast. The structural equation modeling technique was used to test the research hypothesis. This study showed empirically that concern over information and communication technologies (ICT) access as an explanation for digital inequality should be toned down. This research suggests emphasizing alternative factors to explain Internet sustained use intention by underprivileged individuals, including normative beliefs. The results will help internet service providers, governments, and international aid agencies to better understand users' behaviors or reactions to ICT available to them. This understanding provides a foundational platform upon which viable and effective information technology-enabled solutions and policies can be conceptualized and implemented. This study is one of the few that integrate three salient beliefs to differentiate ICT use continuance intention in the context of digital inequality.

scholarly journals A formal analysis of some factor- and precedent-based accounts of precedential constraint

2021 ◽  
Author(s):  
Henry Prakken
Keyword(s):  
Formal Analysis ◽  
Simple Factor ◽  
The Difference

AbstractIn this paper several recent factor- and dimension-based models of precedential constraint are formally investigated and an alternative dimension-based model is proposed. Simple factor- and dimension-based syntactic criteria are identified for checking whether a decision in a new case is forced, in terms of the relevant differences between a precedent and a new case, and the difference between absence of factors and negated factors in factor-based models is investigated. Then Horty’s and Rigoni’s recent dimension-based models of precedential constraint are critically examined. An alternative to their reason models is proposed which is less expressive but arguably easier to apply in practice.

Synchronization in Dual Delay Line SAW Sensors

2004 ◽  
Author(s):  
Duck-Bong Seo ◽  
Z. C. Feng
Keyword(s):  
Delay Line ◽  
Phase Measurement ◽  
Surface Adsorption ◽  
Propagation Speed ◽  
Frequency Measurement ◽  
Frequency Change ◽  
Averaged Equations ◽  
Excited Oscillation ◽  
The Difference ◽  
Delay Differential

Surface acoustic wave (SAW) sensors are self-excited oscillators. Self-excitation is a consequence of the finite amount of delay in the circuit. The oscillation frequency is affected by the wave propagation speed which further depends on surface adsorption. Therefore, measurement on the surface adsorption is done by measuring the frequency change of the self-excited oscillation. In dual delay line oscillators the difference between the surface physical conditions is reflected through the difference in oscillation frequencies. Delay differential equations are used to model the sensor. Bifurcation analysis of the averaged equations indicates the presence of synchronization. The occurrence of synchronization is further demonstrated through numerical simulations. Synchronization makes the frequency measurement irrelevant. We propose phase measurement as an alternative in the presence of strong coupling between the two oscillators.

E-retailer cognitive and emotional relationship quality: their experiential antecedents and differential impact on brand evangelism

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ibrahim Al Nawas ◽  
Shadi Altarifi ◽  
Nabil Ghantous
Keyword(s):  
Relationship Quality ◽  
Social Presence ◽  
Structural Equation ◽  
Online Survey ◽  
Word Of Mouth ◽  
Equation Modeling ◽  
Growth Strategies ◽  
Content Type ◽  
The Difference ◽  
Brand Evangelism

PurposeLimited knowledge exists on the difference in the antecedents and outcomes of relationship quality's cognitive and emotional aspects for e-retailers. This research tests how utilitarian and hedonic shopping values differentially affect “cognitive and emotional” relationship quality components and how the latter differentially affects word-of-mouth and brand evangelism.Design/methodology/approachOnline survey data were collected from 450 Jordanian online shoppers. Structural equation modeling (AMOS 24.0) was employed to analyze the data.FindingsFirst, e-retailer's informativeness and transaction convenience (i.e. utilitarian values), drive more strongly cognitive than emotional relationship quality, whereas e-retailer's escapism and social presence (i.e. hedonic values) drive more strongly emotional than cognitive relationship quality. Second, emotional relationship quality has a strong significant effect on brand evangelism, whereas cognitive relationship quality's effect is insignificant. Third, there are no statistically significant differences concerning the effect of cognitive and emotional relationship quality on word-of-mouth.Originality/valueThe findings of our research are expected to enhance our understanding of e-retailer relationship quality, its emergence and consequences. They would also provide e-retailers with guidance on how to execute growth strategies by focusing on specific types of brand relationship quality, on the other hand.

scholarly journals Branching Space-Times

2021 ◽  
Author(s):  
Nuel Belnap ◽  
Thomas Müller ◽  
Tomasz Placek
Keyword(s):  
Single Case ◽  
Formal Analysis ◽  
Rigorous Theory ◽  
Quantum Non Locality ◽  
Foundations Of Physics ◽  
Local Contexts ◽  
Rigorous Framework ◽  
Non Local ◽  
Spatio Temporal ◽  
Non Locality

This book develops a rigorous theory of indeterminism as a local and modal concept. Its crucial insight is that our world contains events or processes with alternative, really possible outcomes. The theory aims at clarifying what this assumption involves, and it does it in two ways. First, it provides a mathematically rigorous framework for local and modal indeterminism. Second, we support that theory by spelling out the philosophically relevant consequences of this formulation and by showing its fruitful applications in metaphysics. To this end, we offer a formal analysis of modal correlations and of causation, which is applicable in indeterministic and non-local contexts as well. We also propose a rigorous theory of objective single-case probabilities, intended to represent degrees of possibility. In a third step, we link our theory to current physics, investigating how local and modal indeterminism relates to issues in the foundations of physics, in particular, quantum non-locality and spatio-temporal relativity. The book also ventures into the philosophy of time, showing how the theory’s resources can be used to explicate the dynamic concept of the past, present, and future based on local indeterminism.

scholarly journals Das Leben ist ein Spiel

2000 ◽  
Vol 43 (4) ◽  
pp. 315-326
Author(s):  
A. Grauvogl
Keyword(s):  
Sexual Reproduction ◽  
Mathematical Theory ◽  
Social Aspects ◽  
Genetic Elements ◽  
The Social ◽  
The Difference

Abstract. Title of the paper: Life is a game Sexual reproduction causes the independent combination of genetic elements. But not only the physiology of reproduction but also behavioural physiology is familiär with independent combinations; in this case the behavioural elements while playing. An attempt is made to analyse and discover the difference between the playing behaviour of animals versus the playing behaviour of humans during childhood. The mathematical theory of game also is based upon selective choice. The social aspects of play in animal and human collectives is explained as well as the possibilities of therapeutical games.

scholarly journals Audio-visual media to improve sexual-reproduction health knowledge among adolescent

2020 ◽  
Vol 9 (1) ◽  
pp. 138
Author(s):  
Sitti Nur Djannah ◽  
Sulistyawati Sulistyawati ◽  
Tri Wahyuni Sukesi ◽  
Surahma Asti Mulasari ◽  
Fatwa Tentama
Keyword(s):  
Sexual Reproduction ◽  
Junior High School ◽  
Health Knowledge ◽  
Visual Media ◽  
Wilcoxon Test ◽  
Post Intervention ◽  
Before And After ◽  
The Mean ◽  
The Difference ◽  
Source Of Information

<span>Lacking knowledge among adolescents affects their understanding of some problems related to sexual-reproduction health. Electronic media recognized as the favored source of information for adolescents. This research aimed to assess the effect of audio-visual media to the increasing of sexual-reproduction knowledge. We conducted a before and after without control informal experimental study design into 153 students in the 1st-3rd grade of junior high school. The effect of the intervention was assessed through the difference between pre- and post-intervention by using the Wilcoxon test. The mean score of the respondent pre and post-intervention was significantly increasing. The audiovisual increased the knowledge of the adolescent regarding sexual-reproduction health</span>

scholarly journals Necessary optimality conditions of a reaction-diffusion SIR model with ABC fractional derivatives

2021 ◽  
Vol 0 (0) ◽  
pp. 0
Author(s):  
Moulay Rchid Sidi Ammi ◽  
Mostafa Tahiri ◽  
Delfim F. M. Torres
Keyword(s):  
Optimal Control ◽  
Fractional Derivative ◽  
Optimality Conditions ◽  
Fractional Derivatives ◽  
Necessary Optimality Conditions ◽  
Reaction Diffusion ◽  
Derivative Operator ◽  
Sir Epidemic ◽  
Non Local

<p style='text-indent:20px;'>The main aim of the present work is to study and analyze a reaction-diffusion fractional version of the SIR epidemic mathematical model by means of the non-local and non-singular ABC fractional derivative operator with complete memory effects. Existence and uniqueness of solution for the proposed fractional model is proved. Existence of an optimal control is also established. Then, necessary optimality conditions are derived. As a consequence, a characterization of the optimal control is given. Lastly, numerical results are given with the aim to show the effectiveness of the proposed control strategy, which provides significant results using the AB fractional derivative operator in the Caputo sense, comparing it with the classical integer one. The results show the importance of choosing very well the fractional characterization of the order of the operators.</p>

Development of a Chinese Superstitious Belief Scale

2009 ◽  
Vol 104 (3) ◽  
pp. 807-819 ◽  
Author(s):  
Li-Shia Huang ◽  
Ching-I Teng
Keyword(s):  
Structural Equation ◽  
Reliability And Validity ◽  
Subsequent Development ◽  
Equation Modeling ◽  
Feng Shui ◽  
Superstitious Belief ◽  
Belief Scale ◽  
The Difference ◽  
Different Cultures ◽  
Superstitious Beliefs

Traditional Western superstitious beliefs, such as black cats and the number 13 bringing bad luck, may not be applicable to different cultures. This study develops a Chinese Superstitious Belief Scale by conducting two studies with 363 and 395 participants, respectively. Exploratory factor analysis was used to construct the scale and then structural equation modeling was applied to verify its reliability and validity. The scale contains six dimensions, Homonym, Traditional customs, Power of crystal, Horoscope, feng-shui, and luck for gambling. Findings are helpful for understanding the difference between Chinese superstitions and the traditional Western superstitions and permits subsequent development of sociopsychological theories on correlates and effects of Chinese superstitions.

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