ABC Model Research Articles

Deterministic and fractional analysis of a newly developed dengue epidemic model

This paper presents a new non-linear dengue epidemiological model with a new type of incidence rate called convex incidence rate. A qualitative study of the proposed model was conducted. Local and global stability and the threshold value are established. By using sensitivity analysis, the highly dominant parameters on the threshold value have been found. For numerical solutions, RK-4 and NSFD schemes are used. Moreover, the novel fractional-order operator created by Atangana-Baleanu for transmission dynamics of the Dengue epidemic model is considered in this paper. Assuming the importance of the non-local Atangana-Baleanu fractional-order approach, the transmission mechanism of Dengue has been investigated while taking into account different phases of infection and various transmission routes of the disease. To conduct the proposed study, first of all, By using the classical operator of ordinary derivatives, we will formulate the model. The fractional order derivative is used and We will expand the model to include fractional order derivatives. The operator being used is the fractional differential operator and has fractional order considered the process of Newton's polynomial for the proposed ABC model a new numerical scheme is developed which helped in presenting an iterative process. Using this scheme, for different values of sample curves are obtained and a pattern is established between the order of the derivative and the dynamics of the infection.

Spatial factors affecting the functional diversity of regenerated brownfields: The case of Silesian Voivodeship (Poland)

Abstract Until 1990, the Silesian Voivodeship was one of the most industrialised regions in Central Europe. The restructuring of the national economy after the change of the political system, in particular the extensive deindustrialisation, resulted in the emergence of substantial quantity of post-industrial brownfields. During the research we identified a total of 125 post-industrial brownfield sites that had undergone a regeneration process between 1990 and 2019. The total value of these regeneration projects was estimated at over EUR 1.7 billion. About 55% of the projects were carried out by public bodies, 40% by private enterprises and 5% by non-governmental organisations. The EU aid from structural funds was used in 37% of projects. The aim of the paper is to provide new empirical evidence about the role of spatial factors on the regeneration and new functional use of the brownfields. The analysis has revealed that there is a statistically significant relationship between the distance from the city centre and the functions of regenerated brownfield sites: commercial services were located closest to the centre, whereas manufacturing plants and investment zones were found at the greatest distance from the city centre. The research has also shown the crucial role of post-industrial heritage for projects related to redevelopment for public services, which was insignificant for other project types. These results have been interpreted in the context of the rent gap theory and the brownfield redevelopment potential model (the so-called ABC model).

Investigation on external quantum efficiency droops and inactivation efficiencies of AlGaN-based ultraviolet-c LEDs at 265–285 nm

The temperature-dependent external quantum efficiency (EQE) droops of 265 nm, 275 nm, 280 nm, and 285 nm AlGaN-based ultraviolet-c light-emitting diodes (UVC-LEDs) differed in Al contents have been comprehensively investigated. The modified ABC model (R = An + Bn 2 + Cn 3) with the current-leakage related term, f(n) = Dn 4, has been employed to analyze the recombination mechanisms in these UVC-LED samples. Experimental results reveal that, at relatively low electrical-current levels, the contribution of Shockley–Read–Hall (SRH) recombination exceeds those of the Auger recombination and carrier leakage. At relatively high electrical-current levels, the Auger recombination and carrier leakage jointly dominate the EQE droop phenomenon. Moreover, the inactivation efficiencies of 222 nm excimer lamp, 254 nm portable Mercury lamp, 265 nm, 280 nm, and 285 nm UVC-LED arrays in the inactivation of Escherichia coli have been experimentally investigated, which could provide a technical reference for fighting against the new COVID-19.

Retention Database for Prediction, Simulation, and Optimization of GC Separations.

This work presents an open source database with suitable retention parameters for prediction and simulation of GC separations and gives a short introduction to three common retention models. Useful computer simulations play an important role to save resources and time in method development in GC. Thermodynamic retention parameters for the ABC model and the K-centric model are determined by isothermal measurements. This standardized procedure of measurements and calculations, presented in this work, have a useful benefit for all chromatographers, analytical chemists, and method developers because it can be used in their own laboratories to simplify the method development. The main benefits as simulations of temperature-programed GC separations are demonstrated and compared to measurements. The observed deviations of predicted retention times are in most cases less than 1%. The database includes more than 900 entries with a large range of compounds such as VOCs, PAHs, FAMEs, PCBs, or allergenic fragrances over 20 different GC columns.

Study on the Origin and Classification of Two Poplar Species on the Qinghai–Tibet Plateau

Poplar not only has important ecological and economic value, but also is a model woody plant in scientific research. However, due to the rich morphological variation and extensive interspecific hybridization, the taxonomy of the genus Populus is very confused, especially in the Sect. Tacamahaca. Based on the extensive investigation of Populus on the Plateau and its surrounding areas, two taxa (Populus kangdingensis and Populus schneideri var. tibetica) that are very similar in morphology and habitat and are in doubt in taxonomy were found. First of all, we set up 14 sample sites, carried out morphological investigation and statistics, and found that there were a few morphological traits that could be distinguished between the two taxa. Further phylogenetic analysis based on the whole genome resequencing data showed that the two taxa were hybrid progenies of P. xiangchengensis and P. simonii. Through gene flow detection and genetic differentiation analysis, it was found that there was still strong gene flow from P. xiangchengensis to the two taxa, and there was almost no differentiation between the two taxa. Therefore, P. schneideri var. tibetica should be classified into P. kangdingensis as same taxa. Finally, the population history was reconstructed by PSMC and ABC models, and it was found that they all belonged to a hybrid origin, and the change in population size was closely related to the Quaternary ice age. In addition, the hybrid population has better adaptability, and the suitable distribution area may expand in the future. This study provided a novel and comprehensive method for the phylogeny of Populus and laid a foundation for the development and utilization of poplar resources.

Identifying the role of carrier overflow and injection current efficiency in a GaN-based micro-LED efficiency droop model.

In this paper, we investigate the efficiency droop phenomenon in green and blue GaN-based micro-LEDs of various sizes. We discuss the distinct carrier overflow performance in green and blue devices by examining the doping profile extracted from capacitance-voltage characterization. By combining the size-dependent external quantum efficiency with the ABC model, we demonstrate the injection current efficiency droop. Furthermore, we observe that the efficiency droop is induced by injection current efficiency droop, with green micro-LEDs exhibiting a more pronounced droop due to more severe carrier overflow compared to blue micro-LEDs.

Determinants of Polish young adults' attitudes toward food safety

PurposeDetermine the elements of young adult consumers' attitudes toward food safety using a food safety attitude (FSA) questionnaire and identify the factors influencing them.Design/methodology/approachThis study adopts a descriptive and explanatory perspective to the research problem. Determination of students' attitudes was carried out by direct survey using a questionnaire. The ABC model of attitude was used to construct the statements in the questionnaire. The respondents' answers were analyzed using statistical methods.FindingsThe proposed questionnaire has proven to be a useful tool for assessing food safety attitudes and has identified important new elements in consumers' attitudes. Students' attitudes toward food safety are shaped by sociodemographic and psychosocial factors such as customer type, attitude toward risk, and how they make food purchasing decisions.Research limitations/implicationsInformation about students' attitudes was obtained only from surveys. The survey results provide valuable insights for business practice.Practical implicationsFindings can be used to increase the effectiveness of efforts by various organizations aimed at changing consumer attitudes and behavior and to help understand why consumers implement some food safety behaviors and not others.Social implicationsThe research results will help more effectively target efforts to change consumer attitudes, which could translate into a reduction in cases of illness caused by eating unsafe food or following proper practices when shopping and at the home preparation stage.Originality/valueDevelopment of a reliable tool for the study of attitudes. Identify the new elements of young adult consumers' attitudes and the factors that shape them.

A predator–prey model with additive Allee effect and intraspecific competition on predator involving Atangana–Baleanu–Caputo derivative

A mathematical model of an interaction between two populations namely prey and predator is studied based on a Gause-type predator–prey model involving the additive Allee effect and intraspecific competition on the predator. A famous fractional operator called Atangana–Baleanu–Caputo fractional derivative (ABC) is employed to integrate the impact of the memory effect on the dynamical behavior of the model. The existence, uniqueness, non-negativity, and boundedness of the solution are given to confirm the biological feasibility and validity of the model. Three types of equilibrium points are identified on the origin, axial, and interior including their existence conditions. The Lyapunov direct method for the ABC model is used to investigate the asymptotic stability condition for each equilibrium point. The numerical simulations are provided to demonstrate the impact of several biological parameters on the dynamics of the solutions. The emergence of transcritical, saddle–node, and backward bifurcations driven by the Allee constant are provided which resulted in the appearance of bistability condition. A Hopf bifurcation as well as the evolution of the limit-cycle also occurs as the impact of the memory effect. Each analytical and numerical result is biologically interpreted to show the way that the density of both populations always balances in their ecosystem.

Hydrodynamics for the ABC model with slow/fast boundary

In this article, we consider the ABC model in contact with slow/fast reservoirs. In this model, there is one particle per site, which can be of type α∈{A,B,C} and particles exchange positions in the discrete set of points {1,…,N−1} with a rate which is weakly asymmetric and depends on the type of particles involved in the exchange mechanism. At the boundary points x=1,N−1 particles can be injected or removed, and the rate at which this happens depends on the type of particles involved. We prove the hydrodynamic limit, in the diffusive time scale, given by a system of non-linear coupled equations with several boundary conditions, that depend on the strength of the reservoir’s action.

Theoretical and Experimental Studies on Material Gain for Wide Polar InGaN Quantum Well‐Mechanism Leading to Electric Field Screening and Lasing

AbstractThe width of polar InGaN quantum wells (QWs) is usually limited to a few nanometers to ensure a sufficient overlap between the wave functions of the ground electron and hole state. This paper presents the results of material gain measurements for thin (2.6 nm), wide (10.4 nm), and extremely wide (25 nm) InGaN QWs. The comparison of experimental data with theoretical predictions allows for correlation of the current density with the carrier concentration, which contributes to the positive material gain, and determination of the coefficients in the standard ABC model. It is shown that the mechanism in wide and narrow polar QWs that leads to electric field screening and lasing is different. For wide QWs, the optical transitions between excited states become dominant in the gain spectrum. The reason for such a gain mechanism is the built‐in electric field, which must first be screened. The ground electron and hole states play a very important role in the screening; however, their contribution to the material gain and lasing in wide QWs is very weak.

Influences of Customers Nostalgic Proneness on Their Brand Cognition Based on the ABC Model of Attitude

As the economic environment and social culture change dramatically, nowadays there are numerous opportunities for the nostalgic brand in China to regain competitive advantages. Grounded on the affective, behavior, and cognition (ABC) model of attitude, this paper aims to clarify the relationship between customers nostalgic proneness, purchase intention, and brand cognition to explain the mechanism of nostalgic consumption. Taking the big white rabbit brand as an example, a structural equation model was used after the constructs were empirically confirmed by reliability and validity tests. Customers nostalgic proneness is found to be positively correlated with their brand cognition and the nostalgic brand is advised to fully exert its potential.

Genome-Wide Analysis of MIKCC-Type MADS-Box Genes Reveals Their Involvement in Flower Development in Malus Lineage

MIKCC-type MADS-box genes are involved in floral organ identity determination but remain less studied in the Malus lineage. Based on the conserved domains of this gene family, we identified 341 genes among 13 species. Classification results showed that the MIKCC-type were generated later than the M-type, after the formation of Chlamydomonas reinhardtii. By phylogenetic analysis, three different groups were divided among 12 plant species, and one group was an ancestral MIKCC-type MADS-box homologous gene cluster from lower moss to higher flowering plants. Comparative analysis of these genes in A. thaliana and Malus lineages revealed a similar pattern evolutionary relationship with the phylogenetic analysis. Three classes of genes of the ABC model in A. thaliana had orthologous genes in the Malus species, but they experienced different evolutionary events. Only a whole-genome duplication (WGD) event was considered to act on the expansion of ABC-model-related genes in the Malus lineage. Additionally, the expression pattern of genes showed to be involved in flowering development stages and anther development processes among different M. domestica cultivars. This study systematically traced the evolutionary history and expansion mechanism of the MIKCC-type MADS-box gene family in plants. The results also provided novel insights for ABC model research of flower development in the Malus lineage.

Using Rational Emotive Behavior Therapy to Improve Psychological Adaptation among Future Coaches in the Post-Pandemic Era

This study aims to demonstrate that applying rational emotional behavior theory (REBT) concepts can help to improve the psychological adaptation of future coaches in the post-pandemic era. The current research utilizes a qualitative approach with a sample of 14 future coaches, namely, students of the study program "Training systems" at Lithuanian Sports University. These students are also active athletes (basketball players). Interview questions were developed based on the ABC(DE) model, and answers were analyzed following the methodology of content analysis. In general, our findings fit the ABC(DE) framework. However, there are several important exceptions. During discussions, participants presented their basic beliefs in the form of statements rather than demands. The ABC(DE) framework predicts the latter. Furthermore, participants' automatic thoughts are not logical derivatives of their basic beliefs, contrary to the REBT theory. However, it is possible to interpret basic beliefs as an explanation for automatic thoughts, meaning that this interpretation seemingly does not contradict the theoretical principles of REBT. As such, REBT appears to be helpful for better understanding the psychological adaptation problems that arose during the pandemic and are relevant in the post-pandemic era.

Radiative recombination of a high internal-quantum-efficiency 268 nm ultraviolet C-band light emitting diode

After assigning a thickness d to the carrier recombination region of a light emitting diode (LED), we show that the ABC model involving Shockley–Read–Hall non-radiative, radiative, and Auger recombination coefficients, i.e., A, B, and C, respectively, can bring new insight into the radiative recombination process. In order to fit external quantum efficiency (EQE) data of ultraviolet C-band (UVC) as well as blue LEDs, the ABC model requires the product d·B to be invariant of the injection current. This can be understood that as the thickness of the recombination region increases the radiative recombination coefficient decreases due to reduced electron–hole wavefunction overlaps. For an LED with high internal quantum efficiency (IQE), its quality factor Q (Q=BAC) usually undergoes a noticeable drop as the injection current increases to pass the current of maximal EQE. This is due to an increase in the thickness of the recombination region and, hence, a reduction in the radiative recombination coefficient as the injected carriers start to drift or diffuse to involve more quantum wells for light emission. Applying this ABC model, we analyze a high-efficiency 268 nm UVC LED, which delivers ∼199 mW optical power under a direct current of 350 mA and obtains a maximal IQE of ∼86.4% and an effective light extraction efficiency of ∼15.3%.

AN EFFECTIVE MANAGEMENT OF SUICIDAL IDEATION AND SELF-INJURIOUS BEHAVIORS IN YOUTH

Depression is the most common yet ignored public health issues in Pakistan. The prevalence is uncommon among children but vastly evident during adolescence. Unhealthy parenting practices and childhood trauma directly contributes towards depressive disorders and suicidal ideation later in life if left unresolved. A similar case of 17 years old was referred with her presenting complaints of: sadness, irritability, crying spells, suicidal ideation, self-harm, negative thinking, loss of interest in pleasurable activities, sleeplessness, psychomotor agitation, fatigue, lack of concentration, feelings of rejection and worthlessness for a year. The formal assessment was done by using Beck Depression Inventory (BDI). Based upon the assessment, the client was provisionally diagnosed with Major Depressive Disorder 296.23. A management plan includes ABC model, Cognitive distortions, Double column technique, Triple column technique and Relapse prevention. For the management of the suicidal thoughts/ ideation, strengthening of familial support, creating supportive environment, ensuring protective environment, reducing access to objects, substance or any means that could be lethal danger to life, promoting connectedness. A total number of sessions conducted with the client were 12 and the change was 35%.
 Keywords: Suicidal Ideation, Self-Injurious Behavior, Adolescence, Cognitive Behavior Therapy, Efficacy

Enhancer/gene relationships: Need for more reliable genome-wide reference sets.

Differences in cells' functions arise from differential activity of regulatory elements, including enhancers. Enhancers are cis-regulatory elements that cooperate with promoters through transcription factors to activate the expression of one or several genes by getting physically close to them in the 3D space of the nucleus. There is increasing evidence that genetic variants associated with common diseases are enriched in enhancers active in cell types relevant to these diseases. Identifying the enhancers associated with genes and conversely, the sets of genes activated by each enhancer (the so-called enhancer/gene or E/G relationships) across cell types, can help understanding the genetic mechanisms underlying human diseases. There are three broad approaches for the genome-wide identification of E/G relationships in a cell type: 1) genetic link methods or eQTL, 2) functional link methods based on 1D functional data such as open chromatin, histone mark or gene expression and 3) spatial link methods based on 3D data such as HiC. Since 1) and 3) are costly, the current strategy is to develop functional link methods and to use data from 1) and 3) as reference to evaluate them. However, there is still no consensus on the best functional link method to date, and method comparison remain seldom. Here, we compared the relative performances of three recent methods for the identification of enhancer-gene links, TargetFinder, Average-Rank, and the ABC model, using the three latest benchmarks from the field: a reference that combines 3D and eQTL data, called BENGI, and two genetic screening references, called CRiFF and CRiSPRi. Overall, none of the three methods performed best on the three references. CRiFF and CRISPRi reference sets are likely more reliable, but CRiFF is not genome-wide and CRiFF and CRISPRi are mostly available on the K562 cancer cell line. The BENGI reference set is genome-wide but likely contains many false positives. This study therefore calls for new reliable and genome-wide E/G reference data rather than new functional link E/G identification methods.

Violence Toward and by Youth: Part I: Looking for the "Whys".

Violence is a public health crisis. It is especially concerning when it involves youth, whether they be victims, perpetrators, or observers. Part 1 of this two-part series categorizes the types of violence toward and by youth. There is a great deal of information on the prevalence of violence, mostly related to school shootings. However, the literature provides limited information on the antecedents of violent behaviors, and there is a dearth of information on "why" youth engage in violence. This is the unanswered question that drives Part 1 of this series. The beginning steps to understand "why" are viewed through the lens of a modified ABC Model (antecedent, behavior, consequence). Interventions for youth violence will be explored in Part 2.

Exploring Prosodic Pragmatics at Affective Level

This research work presents a conceptual framework to explore the interplay between intonation and emotional expressions that conveys pragmatic meaning of linguistic utterances. Theory of Affective Pragmatics (TAP), an innovative theory that functions parallel to speech act theory, is applied to introduce a conceptual framework to study prosodic pragmatics at a profound level. The affective component of attitude is introduced in the framework using Ostrom’s ABC model to comprehend affective pragmatics. For further study on this framework, quantitative research design is desirable to analyze data and the data is suggested to be obtained through emotional recordings from emotional prosody speech and transcripts (EPST). Praat as an apt tool recommended for the prosodic analysis of the data. This framework explains how intonation patterns signal unabridged emotions and feelings to understand speaker’s implied meaning. It elaborates the emotional expressions that convey pragmatic meaning to intellectualize affective pragmatics. It highlights some other facets that render affective pragmatics a new-fangled field of research. It has also been envisioned to broaden the scope of prosodic pragmatics as a distinctive research domain in linguistics. The framework is an application of TAP and provides grounds to researchers to understand prosodic pragmatics at a deeper level and to perform future researches in more effective ways. The research is unique in its essence as it offers a conceptual framework to explore affective component of attitude in prosodic pragmatics that has not yet been explored.

Expression patterns of ABCE model genes during flower development of melon (Cucumis melo L.)

In production, most cultivars of melon are andromonoecious and characterized by carrying both male and bisexual flowers on the same plant. In this study, four A-class genes (CmAP1a, CmAP1b, CmAP2a and CmAP2b), two B-class genes (CmAP3 and CmPI), two C-class genes (CmAGa and CmAGb) and four E-class genes (CmSEP1,2,3,4) were identified in melon. However, no D-class gene of melon was identified. The conserved domains of ABCE function proteins showed relatively high similarity between Arabidopsis and melon. The expression patterns of ABCE homeotic genes in different flower buds of melon suggested that transcripts of CmAP1a, CmPI and CmSEP1 in bisexual buds were significantly lower than that in male flower buds, while the expression levels of CmAGa, CmAGb and CmSEP4 in bisexual flower buds were significantly higher than that in male flower buds. There was no significant difference in expression levels of other ABCE model genes between male buds and bisexual buds. Subsequently, qRT-PCR was performed in different floral organs of bisexual flowers in melon. For A class genes, CmAP1a and CmAP1b showed the highest accumulation in sepals than petals, stamens and pistil, while CmAP2a and CmAP2b revealed the highest expression in pistil than other three floral organs. For B class genes, CmAP3 and CmPI were highly accumulated in petals and stamens though CmAP3 also showed abundant accumulation in pistil. For C class genes, the expression levels of CmAGa and CmAGb were higher in stamens and pistil than that in sepals and petals. For E class genes, CmSEP1 showed higher expression level in sepals and petals than stamens and pistil. CmSEP2, CmSEP3 and CmSEP4 showed the highest accumulation in pistil than other floral organs. These results provided a theoretical basis for studying the function of ABCE homeotic genes in floral organs development of melon.

Status quo and predictors of Weibo users' attitudes toward lesbians and gay men in 31 provinces in the Chinese mainland: Analysis based on supervised machine learning and provincial panel data.

Public attitudes toward consensual same-sex relations are crucial to lesbians' and gay men's rights and society's well-being, but research addressing this topic in China is limited. We comprehensively explored the current status and predictors of Weibo users' attitudes toward individuals who are lesbian or gay (IWLG) at the provincial level in the Chinese mainland. Natural language processing and machine learning techniques were incorporated to analyze 1,934,008 Weibo posts from January 1, 2010, to December 31, 2020, to evaluate Weibo users' expressed attitudes toward IWLG in 31 provinces in the Chinese mainland guided by the ABC Model of attitude. Although the general attitudes, feelings, and support for the rights of Weibo users toward IWLG among different provinces were relatively positive, knowledge about IWLG was noticeably inaccurate. Economic development and educational level positively predicted certain aspects of attitudes at the provincial level. Weibo users from different provinces are generally supportive and accepting of people who are gay and the rights of the gay community. However, considerable misconceptions and inaccurate knowledge of IWLG surfaced in Weibo users' posts. Economic development and educational level were important predictors of specific attitudes toward IWLG at the provincial level. Increased efforts to address the unbalanced and insufficient development between different provinces could help reduce the public's prejudice, stigma, and discrimination toward IWLG. Policies that facilitate greater implementation of Comprehensive Sexuality Education sequentially and effectively are suggested as well.