Constant Mobility Research Articles

I am a ‘|’ not a ‘-’: a phenomenographic study of bi/multilingual adolescents’ conceptions of transnational identity

ABSTRACT Previous studies have described diaspora members as linguistically stable subjects on whom bounded linguistic or ethnic categories are imposed, yet more recent research tends to view transnational identity as fluid and situational. This study investigates how adolescents with advanced Chinese and English proficiency living across China and the United States perceive their language and identity under conditions of constant mobility. Drawn from a two-year ethnographic project on Chinese diasporic families, the present study adopted phenomenography as the methodological approach and collected data through interviews and participant observations with 18 transnational adolescents living in the US. The findings reveal the adolescents’ perspectives on transnational identity as a situated construct that entails one’s sense of location, nationality, ethnicity, culture, kinship, language and pursuit of personal meaning. These many facets of identity are not mutually exclusive but closely interrelated, and these adolescents can access a rich identity repertoire through strategic bilingual/multilingual practices. These findings suggest the fluidity and complexity of transnational identity and illustrate the analytical efficacy of phenomenography. Crucially, through this way of identity performance these bi/multilinguals are able to break the hyphenated entitlement (e.g. ‘Chinese-American’) that may have suppressed their self-recognition and embrace a fascinating world with unprecedented possibilities.

Second-Generation Phage Lambda Platform Employing SARS-CoV-2 Fusion Proteins as a Vaccine Candidate.

The recent SARS-CoV-2 (COVID-19) pandemic exemplifies how newly emerging and reemerging viruses can quickly overwhelm and cripple global infrastructures. Coupled with synergistic factors such as increasing population densities, the constant and massive mobility of people across geographical areas and substantial changes to ecosystems worldwide, these pathogens pose serious health concerns on a global scale. Vaccines form an indispensable defense, serving to control and mitigate the impact of devastating outbreaks and pandemics. Towards these efforts, we developed a tunable vaccine platform that can be engineered to simultaneously display multiple viral antigens. Here, we describe a second-generation version wherein chimeric proteins derived from SARS-CoV-2 and bacteriophage lambda are engineered and used to decorate phage-like particles with defined surface densities and retention of antigenicity. This streamlines the engineering of particle decoration, thus improving the overall manufacturing potential of the system. In a prime-boost regimen, mice immunized with particles containing as little as 42 copies of the chimeric protein on their surface develop potent neutralizing antibody responses, and immunization protects mice against virulent SARS-CoV-2 challenge. The platform is highly versatile, making it a promising strategy to rapidly develop vaccines against a potentially broad range of infectious diseases.

A linear second order unconditionally maximum bound principle-preserving scheme for the Allen-Cahn equation with general mobility

In this work, we investigate a linear second-order numerical method for the Allen-Cahn equation with general mobility. The proposed scheme is a combination of the two-step first- and second-order backward differentiation formulas for time approximation and the central finite difference for spatial discretization, two additional stabilizing terms are also included. The discrete maximum bound principle of the numerical scheme is rigorously proved under mild constraints on the adjacent time-step ratio and the two stabilization parameters. Furthermore, the error estimates in H1-norm for the case of constant mobility and L∞-norm for the general mobility case, as well as the energy stability for both cases are obtained. Finally, we present extensive numerical experiments to validate the theoretical results, and develop an adaptive time-stepping strategy to demonstrate the performance of the proposed method.

Structure preserving finite element schemes for the Navier-Stokes-Cahn-Hilliard system with degenerate mobility

In this work we present two new numerical schemes to approximate the Navier-Stokes-Cahn-Hilliard system with degenerate mobility using finite differences in time and finite elements in space. The proposed schemes are conservative, energy-stable and preserve the maximum principle approximately (the amount of the phase variable being outside of the interval [0,1] goes to zero in terms of a truncation parameter). Additionally, we present several numerical results to illustrate the accuracy and the well behavior of the proposed schemes, as well as a comparison with the behavior of the Navier-Stokes-Cahn-Hilliard model with constant mobility.

A constructive delay-aware model for opportunistic routing protocol in MANET

Mobile ad-hoc Networks (MANET) with mobile sinks are measured as a practical substitute to the complex deployment of conventional wireless sensing environments. This research concentrates on the high-throughput opportunistic routing with lower delay during the transmission service by the mobile nodes with an arbitrary number of mobile sinks and common network topology. Here a novel opportunistic routing (OR) model known as Delay-Aware Estimated Transmission Rate (DA-ETR) is proposed to evaluate the delay caused due to the intermittent mobile nodes and packet re-transmission process. With the execution of DA-ETR, the work demonstrates the functionality of DA-ETR seamlessly over the ETR. It specifies that the available ETR-based routing protocols for dynamic MANET are extended easily to MANET with minimum modification using the anticipated DA-ETR model. Also, the anticipated DA-ETR model with efficiency measure provides superior throughput and enhances the routing stability of OR. The novelty of the work relies on enhancing the routing performance. Thus, the proposed DA-ETR model seems lightweight and achieves easier deployment with no constant mobility prediction. The DA-ETR model for OR outperforms various existing approaches and shows better performance by achieving scalability, reliability, reduced routing and communication overhead and transmission delay. The proposed model shows a queue length of 6.5 packets, 6.3 packets/node/sec in transmission and reception rate, the delay is 50 ms, storage overhead is 80 packets, communication overhead is 20 packets and 2.5 ms packet loss. The simulation is done in the MATLAB 2020a environment.

Restoration of internal rotation after reverse shoulder arthroplasty may vary depending on etiology in patients younger than 60 ​years of age: a multicenter retrospective study

BackgroundReverse shoulder arthroplasty (RSA) offers promising functional outcomes for young patients, yet challenges persist in restoring internal rotation (IR). This study aimed to assess the restoration of IR after RSA in patients younger than 60 years old and analyze the factors affecting IR recovery. MethodsA retrospective multicenter study was conducted, examining the functional outcome of patients who underwent RSA, with a minimum follow-up period of 2 years. Two subgroups of patients who underwent primary RSA were analyzed separately with respect to active (AIR1): “difficult AIR1” and “easy AIR1.” ResultsThe study included 136 patients (overall series) with a mean age of 51.6 years. The overall series showed statistically significant improvement in active range of motion (RoM), pain, and Constant scores, especially with active IR (p<0.01). According to etiology, statistically significant improvement (p<0.05) in active IR was observed for fracture sequelae, primary osteoarthritis, and rheumatoid arthritis, while no statistically significant improvement in internal rotation was observed for tumor, revision, and cuff tear arthropathy (p>0.05). In subgroup analysis, patients with easy AIR1 displayed a statistically significant lower body mass index and better Constant score mobility, as well as improved motion in forward elevation and active IR (p<0.05). No statistically significant associations were found between improved IR and prosthetic design or subscapularis repair. Scapular notch, lysis of the graft, and teres minor atrophy were significantly associated with better active IR (p<0.05). ConclusionRSA improves active RoM, pain, and functional outcomes in patients under 60. However, the degree of improvement in IR may vary depending on several factors and the underlying etiologies. These insights are crucial for patient selection and counseling, guiding RSA optimization efforts. Level of evidenceIV

Unified framework for the separation property in binary phase-segregation processes with singular entropy densities

Abstract This paper investigates the separation property in binary phase-segregation processes modelled by Cahn-Hilliard type equations with constant mobility, singular entropy densities and different particle interactions. Under general assumptions on the entropy potential, we prove the strict separation property in both two and three-space dimensions. Namely, in 2D, we notably extend the minimal assumptions on the potential adopted so far in the literature, by only requiring a mild growth condition of its first derivative near the singular points $\pm 1$ , without any pointwise additional assumption on its second derivative. For all cases, we provide a compact proof using De Giorgi’s iterations. In 3D, we also extend the validity of the asymptotic strict separation property to the case of fractional Cahn-Hilliard equation, as well as show the validity of the separation when the initial datum is close to an ‘energy minimizer’. Our framework offers insights into statistical factors like particle interactions, entropy choices and correlations governing separation, with broad applicability.

On the separation property and the global attractor for the nonlocal Cahn-Hilliard equation in three dimensions

We consider the nonlocal Cahn-Hilliard equation with constant mobility and singular potential in three dimensional bounded and smooth domains. This model describes phase separation in binary fluid mixtures. Given any global solution (whose existence and uniqueness are already known), we prove the so-called instantaneous and uniform separation property: any global solution with initial finite energy is globally confined (in the L∞\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$L^\\infty $$\\end{document} metric) in the interval [-1+δ,1-δ]\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$[-1+\\delta ,1-\\delta ]$$\\end{document} on the time interval [τ,∞)\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$[\ au ,\\infty )$$\\end{document} for any τ>0\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\ au >0$$\\end{document}, where δ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\delta $$\\end{document} only depends on the norms of the initial datum, τ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\ au $$\\end{document} and the parameters of the system. We then exploit such result to improve the regularity of the global attractor for the dynamical system associated to the problem.

#Nowhereland

Rural places and small towns are highly valued by lifestyle migrants who wish to live close to nature (Verdich 2010) and have a more environmentally friendly lifestyle. Ängsbacka is a course center and a community for alternative lifestyles, located on the outskirts of a small town in mid-Sweden. The center emphasizes community and belonging, while also being a place characterized by cosmopolitan taste patterns and constant mobility, which can be described as a cocoon community (following Korpela and Dervin 2013).&#x0D; The members of the cocoon community use social media platforms such as Instagram to make place for themselves, to communicate belonging. Through images, hashtags and captions, they make connections between various places, people, activities and emotions that together contribute to the user’s spatial self (Schwartz and Halegoua 2015) and to the place making efforts of the community. Those using the hashtag ängsbacka often do so to communicate a deep connection between the place and themselves. At the same time, while the local place and nature is at the center of their activities, it is simultaneously a mere backdrop for their projects of personal development.&#x0D; Using Ängsbacka as a case, the article adds to research about digital place making beyond cities, by examining how the local place is given meaning within a community defined by privileged mobility. To analyze the intermingling of the local and the global in the context of sustainability, I combine theories of place making with Carfagna et al’s (2014) concept of ecological habitus. I argue that discourses on sustainability and harmony with nature can create a connection and sense of belonging that combines the (hyper)local with global (alternative) lifestyles.

Preserving health through traditions: How folk customs form a healthy lifestyle

This article explores the relationship between folk customs and the formation of a healthy lifestyle. It has long been observed that folkways, deeply rooted in cultural practices, influence health behavior and outcomes. One of the main objectives of the study concerns nature and ecosystem as the Earth, as part of the Universe, has a variety of natural resources that are necessary to support human life. Materials and methods of research: Through a comprehensive review of existing literature and ethnographic studies, this study elucidates the mechanisms through which folk practices shape various aspects of health, including physical, mental, and social well-being. The nomadic lifestyle shapes their unique characteristics, involving constant mobility and adaptation to diverse surroundings. Results of the study: Examining examples from diverse cultural contexts, the paper highlights the role of traditional practices in promoting healthy dietary habits, physical activity, stress management, and social support networks. Furthermore, it discusses the potential of integrating folk customs into modern health interventions to foster culturally relevant approaches to health promotion and disease prevention. Conclusion of the study: The research recognizes the importance of folk customs in shaping health behavior on the examples of Kyrgyz culture, this study advocates for the preservation and incorporation of traditional practices into modern health initiatives, thereby promoting holistic well-being in diverse communities.

Physical Properties of Cu, Co, and Zn doped TiO2 nanocrystalline thin films prepared using spray pyrolysis

This research focuses on the preparation and characterization of TiO2 thin films in both pure and doped forms. The films were deposited onto glass substrates using the spray pyrolysis technique. The pure film was doped with Cu, Co, and Zn at a constant ratio of 3 wt% in the starting solution. XRD analysis revealed the presence of anatase TiO2 phase in all deposited films. The crystallite size of the pure film was determined using Scherer’s equation and found to be 8.3 nm, while the doped films had sizes of 11.3 nm (Cu), 13.8 nm (Co), and 11.3 nm (Zn). SEM images showed the formation of fine grains with a normal distribution, with average sizes of 27.02 nm (pure), 39.37 nm (Cu), 33.4 nm (Co), and 29.37 nm (Zn) for the respective doped TiO2 films. EDX analysis confirmed the presence of the dopant elements in the deposited films. It was observed that all films exhibited a direct band gap, with a value of 3.79 eV for the pure film, which slightly decreased upon doping. Additionally, various optical constants such as refractive index, extinction coefficient, dielectric constant, relaxation time, and optical mobility were estimated and presented in this study.

Upward social mobility? The capital accumulation of Taiwanese talent in China

AbstractFrom a nation‐state and regional perspective, global talent flows have traditionally been South−North, and the discourse has focused on brain drain or brain gain. This research extends beyond the South−North spatial structure to investigate Taiwanese talent flows to China, examining why young Taiwanese talent is migrating to China for employment in the complex context of cross‐Strait relations, and how they accumulate capital through their own particular globalized situation and the relationship they construct between capital accumulation and spatial mobility. The fieldwork for the present research included in‐depth interviews conducted in 2018 with 35 young Taiwanese who had relocated to Beijing for work. Results found that Taiwanese talent does not always accumulate capital through spatial mobility, but rather they experience the offset of privilege and depreciation of embodied cultural capital in the place of immigration and continue to accumulate mixed forms of embodied cultural capital such as ‘Chinese experience’ which enable the constant mobility or stop in the future. This research describes the dynamics of spatial mobility of talents caused by the accumulation of embodied cultural capital in countering the globalized situation.

A Surface Potential Model for Metal-Oxide-Semiconductor Transistors Operating near the Threshold Voltage

Device physics and accurate transistor modeling are necessary to reduce the operating voltage near the threshold for power-constrained circuits. Conventional device modeling for metal-oxide-semiconductor (MOS) transistors focuses on operations in either strong or weak inversion regimes, and the electrostatics at gate biases near the threshold voltage is rarely studied. This research proposed an analytical model to describe the distribution of the surface potential along the channel for near-threshold operation. Numerical device simulations were also performed to investigate the electrostatics near the threshold voltage. The numerical simulation with constant carrier mobility showed an overshoot in the transconductance due to decay of the lateral electric field with gate bias. The decay of the lateral electric field was predicted by the proposed analytical surface potential model which considered widening the channel length with flooding of the inversion carriers in the channel and gate overlap regions. The channel length widening effect saturated as the gate bias further increased. Therefore, evident transconductance overshoot was observed near the threshold voltage in short-channel devices.

Gamma irradiation-induced changes in structural, linear/nonlinear optical, and optoelectrical properties of PVB/BiVO4 nanocomposite for organic electronic devices

Herein, nanocomposite films based on polyvinyl butyral (PVB) and BiVO4 plates were synthesized through solution casting. The present study aims to investigate the impact of varying doses of gamma irradiation (0, 15, 30, 60, and 90 kGy) on the structural, dispersion, linear/nonlinear optical, and optoelectrical properties of PVB/BiVO4 nanocomposite films. The effects of gamma irradiation on various optical characteristics, such as refractive index (n), extinction coefficient (k), and other related parameters, have been observed. The study of dielectric behavior and the derivation of optoelectrical parameters, including high-frequency dielectric constant (ε∞), plasma frequency (ωP), relaxation time (τ), and optical mobility (µopt.), were conducted using the real and imaginary parts of the dielectric constants εr and εi. In addition, the linear optical susceptibility (χ(1)), the third-order nonlinear optical susceptibility (χ(3)), and the nonlinear refractive index (n2) were studied as a function of gamma irradiation doses. Furthermore, the results demonstrate that the average oscillator wavelength (λ0) values, oscillator strength (S0), and optical conductivity (σopt) vary significantly after gamma radiation treatment. Overall, the strong correlations between the linear/nonlinear optical and optoelectrical parameters of the irradiated PVB/BiVO4 nanocomposite films make them suitable for application in flexible organic electronic devices.

Spin Pumping in Moderately Perpendicular W/CoFeB/HfOx Thin Films

Large perpendicular magnetic anisotropy (PMA) and spin-orbit torques are two essential requirements for high-density and energy-efficient spintronic devices. Recent advances in magneto-electric and magneto-ionic control of PMA and spin-orbit torques have opened a pathway to explore different oxide materials with large dielectric constant and high ion mobility. Motivated by interesting memristive properties of HfOx, here, using broadband ferromagnetic resonance measurements, we study the spin pumping in-plane to perpendicularly magnetized W(5[Formula: see text]nm)/CoFeB(tCFB) system capped with 4[Formula: see text]nm HfOx thin films. We find a large spin pumping and significant PMA strength for HfOx-based thin films. Using ferromagnetic thickness dependence, we also calculate the spin mixing conductance in the trilayer system which is found to be similar to MgO-based thin film stacks. These results will be highly useful for various spintronic applications with electro-static, ionic and memristive gating.

The Sharp Interface Limit of a Navier–Stokes/Allen–Cahn System with Constant Mobility: Convergence Rates by a Relative Energy Approach

The Sharp Interface Limit of a Navier–Stokes/Allen–Cahn System with Constant Mobility: Convergence Rates by a Relative Energy Approach

Multi–component Cahn–Hilliard Systems with Singular Potentials: Theoretical Results

We consider a system of nonlinear diffusion equations modelling (isothermal) phase segregation of an ideal mixture of Nge 2 components occupying a bounded region Omega subset mathbb {R}^{d},dle 3. Our system is subject to a constant mobility matrix of coefficients, a free energy functional given in terms of singular entropy generated potentials and localized capillarity effects. We prove well-posedness and regularity results which generalize the ones obtained by Elliott and Luckhaus (IMA Preprint Ser 887, 1991). In particular, if dle 2, we derive the uniform strict separation of solutions from the singular points of the (entropy) nonlinearity. Then, even if d=3, we prove the existence of a global (regular) attractor as well as we establish the convergence of solutions to single equilibria. If d=3, this convergence requires the validity of the asymptotic strict separation property. This work constitutes the first part of an extended three-part study involving the phase behavior of multi-component systems, with a second part addressing the presence of nonlocal capillarity effects, and a final part concerning the numerical study of such systems along with some relevant application.

Global well-posedness and convergence to equilibrium for the Abels-Garcke-Grün model with nonlocal free energy

We investigate the nonlocal version of the Abels-Garcke-Grün (AGG) system, which describes the motion of a mixture of two viscous incompressible fluids. This consists of the incompressible Navier-Stokes-Cahn-Hilliard system characterized by concentration-dependent density and viscosity, and an additional flux term due to interface diffusion. In particular, the Cahn-Hilliard dynamics of the concentration (phase-field) is governed by the aggregation/diffusion competition of the nonlocal Helmholtz free energy with singular (logarithmic) potential and constant mobility. We first prove the existence of global strong solutions in general two-dimensional bounded domains and their uniqueness when the initial datum is strictly separated from the pure phases. The key points are a novel well-posedness result of strong solutions to the nonlocal convective Cahn-Hilliard equation with singular potential and constant mobility under minimal integral assumption on the incompressible velocity field, and a new two-dimensional interpolation estimate for the L4(Ω) control of the pressure in the stationary Stokes problem. Secondly, we show that any weak solution, whose existence was already known, is globally defined, enjoys the propagation of regularity and converges towards an equilibrium (i.e., a stationary solution) as t→∞. Furthermore, we demonstrate the uniqueness of strong solutions and their continuous dependence with respect to general (not necessarily separated) initial data in the case of matched densities and unmatched viscosities (i.e., the nonlocal model H with variable viscosity, singular potential and constant mobility). Finally, we provide a stability estimate between the strong solutions to the nonlocal AGG model and the nonlocal Model H in terms of the difference of densities.

Social inequalities in mental and physical health derived from the COVID-19 pandemic in Spain beyond SARS-CoV-2 infection

BackgroundUnderstanding the impact of the COVID-19 crisis on health involves conducting longitudinal studies to evaluate the inequalities that may have been exacerbated by the pandemic. The purpose of this study was to estimate differences in physical and mental health derived from the COVID-19 pandemic, beyond SARS-CoV-2 infection, in the Spanish general population according to the participants’ level of education; and to assess the evolution of these differences from June 2020 (just after the lockdown) to nine months later (February-March 2021).MethodsThis is a longitudinal prospective study of a representative sample of non-institutionalized Spanish adults, through computer-assisted telephone interviews. Mobility, self-care, usual activities, pain/discomfort and anxiety/depression problems were measured with EQ-5D-5L. Prevalence ratio (PR) between high and low education levels and adjusted PR were estimated by Poisson regression models. Analyses were stratified by gender.ResultsA total of 2,000 participants answered both surveys. Individuals with low level of education reported more health problems in both genders, and absolute inequalities remained quite constant (mobility and self-care problems) or decreased (pain/discomfort and anxiety/depression problems). The greatest relative inequalities were observed just after the lockdown, with age-adjusted PR ranging from 1.31 (95%CI 1.08–1.59) for women and 1.34 (95%CI 1.05–1.69) for men in pain/discomfort to 2.59 (95%CI 0.98–6.81) for women and 4.03 (95%CI 1.52–10.70) for men in self-care; aPR decreased after nine months for most dimensions.ConclusionsPrevalence of health problems increased during the COVID-19 pandemic in all education groups, but the increase was higher in women and men with a high level of education, suggesting that its impact appeared later in this group. Further analysis on the role of governmental economic aid given to vulnerable people might shed light on this evolution.

Electrophoresis of a dielectric droplet with constant surface charge density.

Electrophoresis of a dielectric fluid droplet with constant surface charge density is investigated theoretically in this study. A pseudo-spectral method based on Chebyshev polynomials is adopted to solve the governing electrokinetic equations. It is found, among other things, that the larger the electrolyte strength in the ambient solution is, the slower the droplet moves in general. This is due to the strong screening effect of the large amount of indifferent counterions in the neighborhood of the droplet, with no reinforcement of potential-determining ions adsorbing to the droplet surface. The droplet comes to a complete halt eventually. Critical points are discovered for highly charged droplets, at which the droplet surface becomes immobile and the interior fluid stops recirculating. The droplet moves like a rigid particle with constant mobility regardless of its viscosity, a situation referred to as the "solidification phenomenon." The deadlock between the spinning motions on the charged droplet surface induced by the electric driving force and the hydrodynamic driving force respectively is responsible for this peculiar phenomenon. This is also observed for a dielectric droplet with constant surface electric potential. We demonstrate here that it occurs in the constant surface charge density situation as well.