Mobility Behavior Research Articles

Electron-phonon interaction in the Bloch-Grüneisen regime: Barrier penetration effects

Barrier penetration effects on electron-phonon interaction of a two-dimensional electron gas confined in a finite barrier height quantum well are investigated in the Bloch-Grüneisen (BG) regime. Barrier penetration effects on demarcation between low-temperature, BG regime and high-temperature, equipartition regime electron-phonon interaction are studied. Strict phase-space selection rules in the BG regime reveal distinct features of electron-phonon interaction in finite barrier height quantum wells. Using a realistic finite barrier height for the confinement of carriers in a quantum well, we show modifications in the behavior of acoustic phonon scattering rates and mobility. A smooth transition from linear to nonlinear behavior of mobility is observed below the BG regime transition temperature. Numerical calculations show infinite barrier height and equipartition regime approximations lead to unrealistic intrinsic electron-phonon interaction.

Exploring social influence effect on mobile marketing behaviors of young consumers in the USA and Mexico

Purpose This study aims to investigate the effect of social influence and value-driven mobile marketing activities on consumers’ acceptance of mobile marketing offers. Design/methodology/approach The method used is survey questionnaire. A proposed model was tested by using structural model analysis and data gathered from 356 Mexico consumers and 346 US consumers. Findings The study shows the number of peers and providing information are the main predictor variables of consumer acceptance of mobile marketing offers in both countries. These results suggest that social value factors are important variables for explaining consumers’ responses to mobile marketing offers across two countries characterized by dissimilar macro-environmental conditions. Research limitations/implications The study’s overall implication about standardization vs adaptation is that social value messages can be standardized across countries. However, the marketing tools and touch points required to communicate any message appeal must be adapted across countries. One limitation in this study is the use of a convenience sample of undergraduate college students. This study did not control for different types of mobile phones and the screen sizes of mobile phones. Practical implications The overall implication of standardization vs adaptation from the study results is that social value messages can be standardized across countries. However, the marketing tools and touch points required to communicate any message appeal must be adapted across countries. Originality/value Unlike previous studies where the emphasis is to explicate the effect of value-oriented mobile activity, this study examines the combined effect of social influence and value-driven mobile activities on acceptance of mobile marketing.

Adaptivity as a key feature of mobile maps in the digital era

Mobile maps are an important tool for mastering modern digital life. In this paper, we outline our perspective on the challenges and opportunities associated with designing adaptive mobile maps that are useful, usable, and accessible to a wide range of users in different contexts. If we claim for adaptive mobile maps to be successful, we need to expand our understanding of map use context, including the physical and digital spaces, user behavior, and individual differences. We identify key challenges, such as the scarcity of knowledge about mobile map use behavior, the need for effective adaptation methods and strategies, user acceptance of adaptive maps, and issues related to control, privacy, trust, and transparency. We finally suggest research opportunities, such as studying mobile map usage, employing AI-based adaptation methods, leveraging the power of visual communication through maps, and ensuring user acceptance through user control and privacy.

Understanding the behavioral intention of the rural population to use demand-responsive transport services

Global efforts to reduce carbon emissions include endeavors to raise the use of public transport means. In rural areas, this poses a distinctive challenge. Demand-responsive transport (DRT) services are a form of public transport that is regarded as a potential contribution to the required mobility behavior change. They mainly utilize small floor buses and require a pre-booking of each trip (via internet, app or telephone). Despite the growing number of active DRT services and trial operations, occupation numbers remain small. To understand this gap, this study investigates latent constructs that influence the behavioral intention of inhabitants living in rural regions to use DRT services. For this purpose, a questionnaire based on the Unified Theory of Acceptance and Use of Technology was adapted, tested independently through an exploratory factor analysis and distributed in Austria. The sample (n = 186) was subjected to a structural equation model. Results show that performance expectancy and attitude towards public transport have a significant impact on the behavioral intention of inhabitants to use DRT services in rural regions, whereas the attitude towards private cars was insignificant. Inter alia, we suggest concentrating on the determination of people’s specific everyday mobility needs in rural areas, analyzing and optimizing the public transport offer as an interrelated system, and communicating its benefits more efficiently.

Electronic, Magnetic, and Optical Tunability of SiP Monolayers via 3d Transition‐Metal Doping

Herein, the electronic, magnetic, and optical properties of direct‐band semiconducting SiP monolayers (MLs) doped with 3d transition‐metal (TM) atoms are investigated using first‐principles calculations. The results indicate that TM (TM = Sc, Ti, Co, Ni, Cu, and Zn)‐doped SiP MLs are nonmagnetic, while TM (TM = V, Cr, Mn, Fe)‐doped ones exhibit prominent magnetic moments. Specifically, V‐, Cr‐, and Fe‐doped SiP MLs are magnetic semiconductors and Mn‐doped SiP ML is a spin gapless semiconductor, where the contributions of the TM atoms to magnetic moments are dominant and the contributions of the nearest Si and P atoms are either small or negligible. Furthermore, the TM (TM = V, Cr, Mn, Fe) doping can enhance the carrier mobility in certain directions and result in highly in‐plane anisotropic mobility behaviors. In addition, the TM (TM = V, Cr, Mn, Fe) doping can not only broaden the optical absorption range of SiP ML to the infrared region, but also enhance the optical absorption coefficients of SiP ML in the visible region. These results provide insights into the TM doping effect on the electronic, spintronic, and optical properties of SiP MLs and may be useful for related applications based on SiP MLs.

Spatiotemporal gender differences in urban vibrancy

Urban vibrancy is the dynamic activity of humans in urban locations. It can vary with urban features and the opportunities for human interactions, but it might also differ according to the underlying social conditions of city inhabitants across and within social surroundings. Such heterogeneity in how different demographic groups may experience cities has the potential to cause gender segregation because of differences in the preferences of inhabitants, their accessibility and opportunities, and large-scale mobility behaviours. However, traditional studies have failed to capture fully a high-frequency understanding of how urban vibrancy is linked to urban features, how this might differ for different genders, and how this might affect segregation in cities. Our results show that (1) there are differences between males and females in terms of urban vibrancy, (2) the differences relate to ‘Points of Interest’ as well as transportation networks, and (3) there are both positive and negative ‘spatial spillovers’ existing across each city. To do this, we use a quantitative approach using Call Detail Record data – taking advantage of the near-ubiquitous use of mobile phones – to gain high-frequency observations of spatial behaviours across Italy’s seven most prominent cities. We use a spatial model comparison approach of the direct and ‘spillover’ effects from urban features on male-female differences. Our results increase our understanding of inequality in cities and how we can make future cities fairer.

Decomposition of travel time expenditure through individual mobility trajectories based on mobile phone signaling data

The concept of travel time expenditure (TTE) or travel time budget (TTB) was developed approximately 60 years ago, and its stability issues have long been debated based on traditional household travel survey (HHTS) methods or less developed information and communication technologies (ICTs). Recent advances in mobile phone technologies have enabled the use of individuals’ mobility information at the disaggregation level. The objective of this study is to explore the TTE based on mobile phone signaling data (MPSD) collected from the residents in two different types of districts in South Korea. The results may produce better spatiotemporal precision than traditional household survey data because MPSD is generated when a mobile phone changes the cell coverage area and base transceiver stations (BTSs) or whenever the recording time interval set by the cellular service provider arrives. On the other hand, tremendous effort is needed to collect and clean up the raw data compared to data obtained using the conventional HHTS method. This paper presents data-cleaning processes and the results of a TTE calculation as a function of the day of weekday, age group, and region type. The processes and results of this study could be useful for modeling human mobility behavior using MPSD.

Immobility and COVID-19: comparing mobility reduction among socio-demographic groups in a large German city during the pandemic

AbstractThe COVID-19 pandemic and the public health measures imposed to tackle the spread of the virus have changed the everyday life and severely reduced the mobility of many. In this paper, we investigate the relationship between changed transport behavior and complex socio-demographic groups. Drawing on a survey on mobility and transport use during the pandemic for the Hanover region (Germany), we find three distinct clusters in our data related to changed mobility behavior: (1) people with no change in transport behavior, (2) people heavily reducing public transport use in the inner city, and (3) people reducing public transport use for their commute. In a second step, we use logistic regression models to understand the socio demographic factors determining each of these change patterns. The results show that women and younger participants were more likely to experience an impact on their travel behavior as well as reducing the use of inner-city public transport, while the reduction of commuter transport seems to be mostly homogeneous once controlled for teleworking. We also find a complex interplay between gender and other socio-demographic factors, especially caring responsibilities for children and student status, to have shaped the reported extent of mobility reduction. We show that we need to think about socio-demographic variables in a more complex way instead of perceiving of them as stand-alone variables. Our analysis hence helps to uncover the complex reality of mobility reduction during the pandemic, providing deeper insights into the (im)mobile reality of people’s lives in times of COVID-19.Kindly check and confirm inserted city name are correctly identified.Yes, the city name is Hanover and thus corretly identified

Sorption and mobility of radioactive Ni in Wolsong waste repository site, South Korea

Radioactive nickels are significant environmental concerns because of their long half-lives (59Ni = 76,000 years and 63Ni = 100.1 years) and high proportions in nuclear wastes in the repositories. Therefore, the investigation of sorption and mobility of Ni at the disposal facility sites is important for the prediction and evaluation of radiological risks to the public. Herein, the batch sorption and column experiments were performed under various geochemical conditions using site-specific rock and groundwater samples collected at the Wolsong low and intermediate level waste (LILW) disposal facility site in South Korea. The batch sorption results revealed that the sorption of Ni was strongly affected by the pH. Approximately 20% Ni adsorbed at pH 5, which enhanced over 90% at pH > 8. The batch sorption results were used to develop the surface complexation model (SCM) to predict the Ni sorption and its mobility behavior. The non-electrostatic generalized composite (GC) SCM approach simulated the Ni sorption data well. We believe, our study can interpret and extrapolate the sorption and transport behavior of Ni in the underground repository conditions.

Roles of accessibility and air-rail intermodality in shaping mobility patterns in mega-city regions: Behavioural insights from China

This paper aims to understand mobility patterns in mega-city regions from perspectives of accessibility and air-rail intermodality. Travellers' preferences for intercity mode and its access and egress modes were simultaneously collected in the context of the Beijing-Tianjin-Hebei mega-city region. The accessibility of transport hubs and destinations was measured to enable interpreting mobility behaviour in three dimensions, i.e., travel mode decisions, departure transport hub decisions, and transport service decisions. The calibrated behavioural model highlights a series of determinants regarding level-of-service attributes, travel characteristics, accessibility, socio-demographics, and their interaction. Based on the behavioural insights, twenty domestic cities were selected as destinations for analysing the dynamics of mobility patterns in terms of the competition within the multi-airport system and air-rail cooperation potential in the long-haul market. The elasticity of shifts in transport demand between the primary and secondary airports in the Beijing multi-airport system was assessed under various pricing strategies, highlighting the vital role of the most accessible airport in air traveller decision-making. Moreover, the results underline the effect of air-rail intermodal service upgrades, e.g., offering baggage handling systems and flexible tickets, on stimulating air-rail intermodal mobility in the mega-city region.

Relationships between student mobility and academic and behavioural outcomes in Western Australian public primary schools

The number of times children change schools, or student mobility, is associated with multiple adverse outcomes across the life span. This study used administrative data from the Western Australian Department of Education for public primary school students who completed Year 6 between 2016 and 2019 to examine potential associations between student mobility and academic (using National Assessment Program – Literacy and Numeracy [NAPLAN] participation and scores) and behaviour outcomes (measured through school suspensions). The odds of participating (vs. not participating) in NAPLAN were significantly lower for students with high mobility. High mobility students also achieved significantly lower scores, on average, on NAPLAN literacy and numeracy at Year 3 and Year 5 compared with low mobility students. However, there was no evidence of an association between student mobility and school suspensions. These findings highlight the need for action to address substantial academic detriment for mobile students, many of whom are likely to be from lower socio-economic backgrounds. Furthermore, current policies to address academic disadvantage are likely to exclude those students at substantial academic risk and require revision to be appropriately triaged.

Influence of an Organic Salt-Based Stabilizing Additive on Charge Carrier Dynamics in Triple Cation Perovskite Solar Cells.

Besides further improvement in the power conversion efficiency (PCE) of perovskite solar cells (PSC), their long-term stability must also be ensured. Additives such as organic cations with halide counter anions are considered promising candidates to address this challenge, conferring both higher performance and increased stability to perovskite-based devices. Here, a stabilizing additive (N,N-dimethylmethyleneiminium chloride, [Dmmim]Cl) is identified, and its effect on charge carrier mobility and lifetime under thermal stress in triple cation perovskite (Cs0.05 MA0.05 FA0.90 PbI3 ) thin films is investigated. To explore the fundamental mechanisms limiting charge carrier mobility, temperature-dependent microwave conductivity measurements are performed. Different mobility behaviors across two temperature regions are revealed, following the power law Tm , indicating two different dominant scattering mechanisms. The low-temperature region is assigned to charge carrier scattering with polar optical phonons, while a strong decrease in mobility at high temperatures is due to dynamic disorder. The results obtained rationalize the improved stability of the [Dmmim]Cl-doped films and devices compared to the undoped reference samples, by limiting temperature-activated mobile ions and retarding degradation of the perovskite film.

The Healthy and Sustainable City—Influences of the Built Environment on Active Travel

The city’s built environment and functionality play a crucial role in shaping individual mobility patterns, impacting the overall health and quality of life of its population. Understanding these influences is an important research topic, making it a central focus of this paper. This study aims to identify the factors responsible for promoting healthy mobility behavior. To address this comprehensively, a multidisciplinary empirical survey was developed based on the “Triad”—a model consisting of the built environment, mobility(-behavior), and public health. In addition to the evaluation of socio-demographic factors and activity radius mapping, statistical analyses like multiple linear regression were used. These statistical analyses allow the assessment of the impact of various independent variables on the promotion of healthy mobility behavior within urban settings. The multiple regression shows that the satisfaction with the accessibility of public transport and the sense of safety as a cyclist contribute to explaining the variation of healthy mobility. Furthermore, the satisfaction with walking in the neighborhood and the inhalation of exhaust fumes while walking also seem to have an impact. The results show the link between the Triad and make it clear that mobility planning and urban planning must take a more integrated approach to promote health and simultaneously protect the climate.

Revisiting modal split as an urban sustainability indicator using citizen science

This paper discusses three uses of modal split indicators, and illustrates how it evolved from a technical, intermediate step in transport analysis, over a measure of transport system efficiency to a symbolic urban sustainable mobility indicator. A framework which includes 11 factors is presented and applied to the different uses of the modal split indicator. Besides the comparison of the three main uses of modal split in research and practice, this contribution focuses on a citizen science project (Straatvinken) in the region of Flanders, Belgium. In this project thousands of citizens carry out traffic counts. While the project was initially set up to monitor modal split targets in the urban area of Antwerp, the emphasis shifted towards street liveability. This is visible in the fact that the citizen science project added a narrative-based liveability survey to capture experiences with and evaluations of the liveability at street level. The case illustrates that citizen science is, besides a tool to address data gaps, also an approach to increase the validity of indicators. The reason is that citizen science, which seems to be underexplored in transport studies, differs in what gets measured, how it is measured and why. This approach has proven to provide a fine-grained, integrated assessment of street-level changes in the composition and intensity of the traffic and their effects on the perceived liveability. We argue that it strengthens and complements traditional modal split measurements at the regional or urban level, which typically rely on the modelling of individual mobility behaviour based on household travel surveys. Traditional approaches allow observing broad trends in mobility choices at the regional level, but they do not provide insights in how those individual choices translate into effects at street level. Although often initiated out of certain sustainability concerns, existing modal split models do not reveal how an observed modal shift at the regional level affects the perceived liveability or sustainability at street level.

The UTAUT Implementation Model in Defining the Behavioral Intention of Mobile Banking Users

Research aims: This goal is to comprehend how the UTAUT model was used to influence mobile banking behavior intentions and act as a mediator variable along with attitude.Design/Methodology/Approach: A quantitative approach and a sample size of 110 respondents using mobile banking were used. The deployment questionnaire for the retrieval technique sample was completed using Google Forms, and the sampling strategy was a snowball. In this study, both data analysis and hypothesis evaluation were performed utilizing PLS-SEM.Research findings: The study uncovered that out of ten hypotheses, seven were accepted, and three were rejected. In this study, performance expectancy, facilitating conditions, and social influence variables could all have an impact on attitude. With regard to behavioral intention, attitude served as a mediator between performance expectancy, social influence, and facilitating conditions. Aside from serving as a mediator, the attitude directly affected behavioral intentions. The results indicate that attitude was not significantly affected by effort expectations, and behavioral intentions were not significantly impacted by trust.Theoretical Contribution/Originality: The Unified Theory of Acceptance and Use of Technology (UTAUT) was employed in this study to understand better how the UTAUT model was applied in influencing mobile banking behavior intentions, as well as how attitude functions as a variable mediator.Practitioners/Policy Implications: Results from the study have implications for how mobile banking users' behavioral intentions may change depending on their performance expectancy, social influence, facilitating conditions, and attitudes.Research Limitations/Implications: Further research is required to observe other aspects, such as the desire to keep utilizing mobile banking, as it is the focus of this study, which was restricted to behavioral intention based on the considerations of UTAUT-based mobile banking users.

The interplay of app characteristics and smartphone addiction in mobile shopping behaviour

AbstractIn recent years, we have witnessed accelerated digital interactions among new technology users as a means of communication, leading to addictive behaviours owing to the overuse of smartphones and other new technological interfaces that have reshaped our daily routines. Thus, we adopted the social cognitive theory and the attachment theory to explore and understand the users' app adaptations and how mobile app characteristics, through their influence on smartphone addiction, impact mobile shopping behaviour. We designed an online survey to gather responses from 302 mobile app shoppers in India. We analysed the data using the partial least squares structural equation modelling technique. The results indicate that perceived privacy and security, personalization, contextual offers, and retailers' reputations trigger smartphone addiction. Moreover, the interaction between smartphone addiction and app incentives encourages mobile shopping intentions and frequent purchases. These findings would presumably enhance mobile app characteristics as the stimulus of a closer relationship between consumers and retailers. We present valuable avenues for practitioners to strategically manage their businesses' mobile app environment.

Perceived Economic Mobility, Future Orientation, and Pro-Environmental Behavior: A Study on Secondary School Students’ Responses to Recycling

Researchers have been paying a great deal of attention to the issues surrounding climate change, a serious threat to every aspect of society. The present research adds to the growing body of literature on pro-environmental behavior by demonstrating that a previously unidentified factor perception of economic mobility systematically affects pro-environmental behavior among secondary school students. Evidence further suggests that the degree of future orientation mediates this effect. This is the first demonstration that the perception of society influences its members’ pro-environmental behavior. Furthermore, the result stresses the importance of cultivating pro-environmental behavior at young ages. This research also discusses other theoretical and substantive implications as well as various future research directions.

Persona Design Methodology for Work-Commute Travel Behaviour Using Latent Class Cluster Analysis

The present study proposes a new methodology that combines quantitative and qualitative data for the generation of representative personas for commuters. The profiles can be used to better understand their travel behaviour and mode choices. The research is based on the example of the region of Agder in Norway and aims to overcome the persona development shortcomings identified by previous researchers. Data from a regional travel behaviour survey (N= 1 849) is analysed using latent class cluster analysis (LCCA), and enriched with qualitative input from 32 interviews, and information provided by an expert panel. This results in a set of 20 representative persona profiles for the case study region. The proposed methodology is easily replicable in other urban networks and has the potential to provide insight into the mobility behaviour and needs of specific groups of people in order to adapt the transport services and encourage climate-friendly behaviour.

Customizing Catalyst/Ionomer Interface for High-Durability Electrode of Proton Exchange Membrane Fuel Cells.

Commercialization applications of proton exchange membrane fuel cells (PEMFCs) are throttled by the durability issues of the electrodes prepared by using catalyst inks. Probing into a desirable catalyst/ionomer interface by adjusting the catalyst inks is an effective way for obtaining high-durability electrodes. The present study investigated quantitatively the catalyst/ionomer interfaces based on the viscosity (η) property of the isopropyl alcohol (IPA) and dipropylene glycol (DPG) nonaqueous mixture solvent for the first time. Accelerated stress test (AST) showed that η as one of the characteristic parameters of the solvent had a threshold effect on the durability of electrodes. The electrodes in the half-cell and single cell all exhibited the highest durability using IPA:DPG = 2:6 (η = 27.00 cP) as the dispersion solvent in this work, embodied by its ECSA loss rate, and the cell potential loss was minimum after AST. The ECSA loss mechanism showed that a fine catalyst/ionomer interface structure was created for the highest durability electrode by regulating the η values of the solvent, and the carbon corrosion loss (le) and Pt particle dissolution loss (ld) were weakened. Based on the molecular dynamics (MD) simulation and 19F NMR spectra results, the solvent ratio (various η and similar ε and δ) affected the dispersion states of the ionomer. For the catalyst inks with the highest durability (IPA:DPG = 2:6), the Nafion backbone and side chain presented a higher mobility behavior in the solvent and tended to show the structure of extension separation and the respective aggregation of hydrophilic/hydrophobic phases. Meanwhile, Pt slab models suggested that the side chain of Nafion more easily adhered to the Pt interface zone, while the backbone was pushed toward the carbon support interface zone as more DPG molecules distributed on the Pt surface, which reduced the dissolution of Pt particles and the corrosion of the carbon support. These catalyst/ionomer interface structures tailored by regulating the solvent η values provide insights into improving the electrode durability.

Revealing the fractal and self-similarity of realistic collective human mobility

Revealing the fractal scaling laws of collective human mobility is benefit to understand the complexity of collective human mobility behaviours and has broad application prospects, such as infectious disease prevention, because fractal networks are potentially more robust against targeted attacks than non-fractal networks. Although many statistical indicators of individual human mobility had been observed in power-law distributions, there is still no evidence so far to verify the fractal or self-similarity of collective human mobility behaviours. This study uncovered the fractal and self-similarity properties on realistic weighted human mobility networks at world-, nation-, and city-wide scales. After observing the necessary conditions of network fractal, i.e., the evident power-law probability distributions of weight-related metrics, the fractal dimensions of weighted human mobility networks were measured to be about 0.67∼0.88. Furthermore, experimental results demonstrated their distinct statistical self-similarity and approximately structural self-similarity. These exciting findings can enhance the fire-new understandings of collective human mobility behaviours, and provide novel solutions for many real-world applications.