Media Processing Research Articles

Numerical investigation on drying characteristics between hot wind and wet coating of battery electrode

In this paper, a three-dimensional dynamic drying model is established between hot wind and wet coating based on dynamic mesh method and multi-field coupling theory of porous media. This model considers the combined influences of hot wind and aluminum plate on drying characteristics of wet coating comprehensively based on meshless parallel method. It is proved to be reliable because its simulation data within the error range of plus/minus 15 %. Through this model, the influences and distribution of different operating parameters on drying characteristics are analyzed for surface and interior of wet coating, and the velocity, temperature and relative humidity of hot wind are selected as 8 m/s-10 m s-1, 353.15K-373.15 K and 35 %-55 %, respectively. The results show that the drying processes of surface and interior can be accelerated effectively for wet coating by increasing velocity and temperature of hot wind, while the relative humidity has little effect on its drying characteristics. Meanwhile, the variation trends of wet coating with the drying time as 0–20 s, 20s-30 s and 30s-50 s are consistent with the acceleration, uniform and deceleration drying processes of porous media, respectively. Finally, the drying uniformity is compared for different partitions of wet coating. The results show that the growth gradient of drying non-uniformity with the increase of velocity is smaller than that with the increase of temperature. The change gradient of drying non-uniformity for wet coating with the change of temperature is larger than that with the change of velocity. For drying model in this paper, the optimal operating strategy when the velocity of hot wind is 8 m/s-10 m s-1, temperature is 363.15 K and relative humidity is 45 % can be adopted to improve the drying uniformity of wet coating while reducing its total drying time in engineering. The research results provide an important theoretical basis for control parameters regulation of lithium-ion battery coating oven.

Development of Interactive E-Book by Flip PDF Professional Application for the Improvement of Students’ Competence in French Language

This research aims to explain the development process, validity, and effectiveness of Flip PDF Professional application media which produces interactive French E-book products that improves students’ language skills. This development process was validated by four media and material validators, and the media was suitable for teaching and learning use at SMA Plus Efarina Simalungun. From needs analysis, students had difficulties in learning French because the learning methods were oriented to lectures/demonstrations and discussions although students needed technology-based media which could became solutions and had several advantages, such as, it was easy to use anytime and anywhere, simple (not heavy on storage), interactive, and complete with video, audio, text, quizzes, etc. This paper was adapted from ADDIE model proposed by Molenda (2008) although this paper only discussed the development stage. In the material validation process, an average score of 87% was obtained so it was categorized as very good. Meanwhile, in the media validation process, an average value of 90% was gotten so it was categorized as very good too. Thus, the development of the Flip PDF Professional application media which was interactive French E-book products could improve students’ language skills. Keywords: Development, Interactive, E-Book, Augmented Reality, Livgent.

Properties and Model of Pore-Scale Methane Displacing Water in Hydrate-Bearing Sediments

The flow characteristics of methane and water in sedimentary layers are important factors that affect the beneficial exploitation of marine hydrates. To study the influencing factors of methane drive-off water processes in porous media, we constructed nonhomogeneous geometric models using MATLAB 2020a random distribution functions. We developed a mathematical model of gas–water two-phase flow based on the Navier–Stokes equation. The gas-driven water processes in porous media were described using the level-set method and solved through the finite element method. We investigated the effects of the nonhomogeneous structure of pore media, wettability, and repulsion rate on gas-driven water channeling. The nonhomogeneity of the pore medium is the most critical factor influencing the flow. The size of the throat within the hydrophilic environment determines the level of difficulty of gas-driven water flow. In regions with a high concentration of narrow passages, the formation of extensive air-locked areas is more likely, leading to a decrease in the efficiency of the flow channel. In the gas–water drive process, water saturation changes over time according to a negative exponential function relationship. The more hydrophilic the pore medium, the more difficult the gas-phase drive becomes, and this correlation is particularly noticeable at higher drive rates. The significant pressure differentials caused by the high drive-off velocities lead to quicker methane breakthroughs. Instantaneous flow rates at narrow throats can be up to two orders of magnitude higher than average. Additionally, there is a susceptibility to vortex flow in the area where the throat connects to the orifice. The results of this study can enhance our understanding of gas–water two-phase flow in porous media and help commercialize the exploitation of clean energy in the deep ocean.

Acoustic response of patchy-saturated porous media: Coupling Biot's poroelasticity equations for mono- and biphasic pore fluids.

Patchy saturation is a term used in the seismic prospecting literature to describe the state of a geological formation in which two immiscible pore fluids prevail in mesoscopic-scale clusters. If the pore fluids have contrasting compressibilities, wave-induced fluid pressure diffusion (FPD) processes may induce significant attenuation and velocity dispersion on seismic waves. Biot's monophasic poroelasticity theory is widely used to model the seismic response of rocks containing binary patches of two immiscible pore fluids. Even though effective fluid approximations may help to represent more realistic partially saturated patches using Biot's monophasic equations, the so inferred dissipation may not be representative of actual biphasic FPD phenomena. In this work, Biot's equations for mono- and biphasic fluids are combined to model FPD processes in porous media, comprising fully and partially saturated patches. An analytical solution for one-dimensional layered patchy-saturated media is presented which permits to explain some, as of yet enigmatic, experimentally observed characteristics such as increased seismic attenuation and stiffening effects occurring at low saturations. The results show that the existence of an additional diffusive wave mode within partially saturated patches may render conventional binary and effective fluid approaches incorrect and error prone.

Singular value decomposition for single-phase flow and cluster identification in heterogeneous pore networks

Pore networks play a key role in understanding and quantifying flow and transport processes in complex porous media. Realistic pore-spaces may be characterized by singular regions, that is, isolated subnetworks that do not connect inlet and outlet, resulting from unconnected porosity or multiphase configurations. The robust identification of these features is critical for the characterization of network topology and for the solution of the set of linear equations of flow and transport. We propose a robust method based on singular value decomposition to solve for network flow and locate isolated subnetworks simultaneously. The performance of the method is demonstrated for pore networks of different complexity.

Detecting sub-instability before three Mw > 6.0 earthquakes on Chinese mainland in 2020–2022 with load/unload response ratio

The sub-instability refers to a stress state that exists between the maximum stress the rock can withstand and its final failure. This stress state should be an indicator of impending large earthquakes, as it occurs in the final stage of earthquake nucleation. We apply the Load/Unload Response Ratio (LURR) method to explore sub-instability in the source media before large earthquakes. The earthquake-related observation data such as the groundwater, crustal deformation, electromagnetism and so on were adopted as data input. The load and unload phases at each observation station are discriminated by the change of Coulomb failure stress caused by earth tides along the tectonically optimal sliding direction. Retrospective studies of this approach on the 2020 Mw6.0 Jiashi, Xinjiang, 2022 Mw6.6 Menyuan, Qinghai, and Mw6.6 Luding, Sichuan earthquakes show that the LURR time series derived from the observation stations near the epicenter exceed 2 standard deviations of the mean within several days to years before the mainshocks. Additionally, as the time of mainshock approaches, the distance between the stations detecting LURR anomaly and epicenter decreases. The LURR anomalies indicate the presence of sub-instability prior to a large earthquake, and their spatio-temporal evolution may suggest the weakening processes in the source media.

Positional Configurations of Media-Audience Interaction in Current Media Process

Positional Configurations of Media-Audience Interaction in Current Media Process

Unsteady MHD‐radiative thin film flow with heat transfer over a stretching surface in porous media

AbstractThis study conducts a computational analysis to explore how magnetic fields, radiation, heat, and mass transfer collectively influence a horizontal stretching sheet within a porous medium. The research focuses on elucidating the dynamics of thin film flow through the formulation of time‐dependent equations and subsequent transformation of fluid flow equations into ordinary differential equations via similarity transformation. The numerical solution is attained employing the Runge–Kutta fourth‐order method coupled with a shooting technique. MATLAB software is utilized to generate graphs and numerical values, offering a detailed representation of engineering‐relevant physical quantities in tabular form. The investigation revealed notable trends associated with varying parameters. Increasing unsteadiness parameters lead to a reduction in velocity, temperature, and concentration fields, while the temperature distribution demonstrates a positive correlation with radiation parameters. Moreover, elevated Prandtl numbers and unsteadiness parameters correspond to augmented heat and mass flux, respectively. Of particular significance is the observed heightened heat transfer rate during the transition from a Prandtl number of 1 (representing air) to 2 (representing oil), alongside an increased mass transfer rate with the escalation in Schmidt number from 0.62 (representing hydrogen) to 0.78 (representing ammonia). A comparative analysis of the numerical findings with existing literature demonstrates excellent agreement, affirming the validity and relevance of the present study. These insights offer valuable implications for understanding and optimizing heat and mass transfer processes in porous media, with potential applications in various engineering and scientific domains.

The Process of Personal Social Media for Work: Unveiling the “Work” Behind Social Media

Many employees are engaging in personal social media for work (PSMW), which involves posting work-related content from a user’s individual social-media account. Despite quantitative studies demonstrating the presence and outcomes of talking about work on social media, scholars know little about the process of using PSMW. To fill this gap, the current study uses social identity theory and boundary theory as conceptual frames to learn why and how people engage in PSMW. Through analyzing interview and observational data from employees’ social media across a variety of industries and work arrangements, we present a model of PSMW. Our findings contribute to scholarship in at least three ways. First, this study exposes the “work” behind PSMW through a pattern of Labored Worklife: a paradox of communicating both authentically and strategically. Second, our findings show PSMW as a distinctive, flexible way through which workers can traverse complicated work and non-work borders and communicate multiple (even conflicting) identities on social media. Third, this project suggests connections between PSMW and scholarship surrounding emotion at work.

Pension Reform Framing on Russian Federal Television: Editorial Policy and Audience Reaction

Abstract The pension reform implemented in Russia in 2018, primarily associated with raising the retirement age, has become evidence of a ‘miscalculation’ of media controllers. Such a ‘miscalculation’ is explained by the improvidence of the ongoing campaign in promoting pension reform. This is mainly due to the lack of elaboration during the prediction of the risks associated with naming the legislative initiative and the intensity of its representation. As a result, the ‘pension reform’ frame, constructed and subsequently promoted by Russian federal TV channels, caused the non-linearity of the media process, inspiring protest moods in the social environment. The media controllers had to modify their editorial policy strategy. After facing challenges, the ‘Big Trio’ was forced to choose a new frame and decide on a new approach and strategy of representation. This helped them to bring stability to the social environment, decrease the risk of reputational damage to the ruling class, and create a foundation to introduce more political initiatives successfully.

The promise of coupling piezo-catalysis and activated persulfate using dual-frequency ultrasound: A novel synergistic method of natural water disinfection

Piezo-coupled catalysis, which is driven by dual-frequency ultrasound (DFUS) at high frequencies (>100 kHz), has emerged as a promising technique for intensifying the oxidation processes in aqueous media. This study aimed at evaluating the performance of high-frequency DFUS (0.12 + 1.7 MHz) coupled with ZnO microparticles (1 µm) and persulfate (S2O82−) for disinfection of filtered natural surface water, spiked with E. coli and E. faecalis, as well as unfiltered natural water with indigenous microflora. Despite the longer treatment times required (as compared to deionized water), this hybrid system provided the fastest inactivation, exhibiting a synergy between DFUS+ZnO and DFUS+S2O82− processes and a high energy-efficiency (231.5 and 91.3 CFU/J for E. coli and E. faecalis, respectively). The obtained results revealed the feasibility of DFUS-driven piezo-coupled catalysis using persulfate for advanced water disinfection.

Experimental and theoretical analysis of loading characteristics of electret filter media for charged particles

The degradation of filtration performance in electret filter media during usage poses a significant challenge. Pre-charging of aerosols has been identified as an effective method to mitigate this issue. However, the effects of particle charging characteristics on the loading characteristics of electret filters still need a comprehensive understanding. In this study, a needle-cylinder corona charger was employed to pre-charge aerosols, and the particle charge state was determined by multiphysics simulation. The effects of particle charge polarity and charge quantity on the loading performance of the electret filter were quantitatively investigated. The results showed that the particle charge polarity had a negligible impact on the loading performance under the condition of the equivalent particle charge quantity. In addition, the charged particles effectively improved the efficiency degradation during the loading process of electret media, with higher charge quantities resulting in more pronounced improvements. The electrostatic attenuation factor showed a negative exponential correlation with the particle charge quantity. This was attributed to the uneven particle deposition on fiber surface due to the attraction of charged particles by the opposite charges on the electret fibers, which alleviated the effect of electrostatic shielding.

Developing a quantitative multimodal and multi-scale, fully non-destructive technique for the study of iron archaeological artefacts

This article presents the methodology and initial findings of the SNSF Sinergia project CORINT. The project's objective is to elucidate the corrosion mechanisms affecting iron-based structures entrapped in various porous media. This paper focuses specifically on iron archaeological artefacts (IAAs) in soil. A novel multimodal quantitative imaging technique, which integrates neutron and X-ray computed tomography (NX-CT), is under development for non-destructive examination of corrosion processes. The method involves registering and fusing neutron and X-ray tomography data, followed by Gaussian mixture model (GMM) clustering for phase segmentation. Imaging was conducted on two IAAs, Vrac C and BdC1. Additionally, random cross-sections of these samples underwent analysis through optical microscopy, µRaman spectroscopy, and SEM-EDS to characterize and correlate corrosion layers with NX-CT results. This study yields valuable insights into the corrosion of IAAs, enabling the non-destructive investigation of corrosion processes in porous media. The implications extend beyond the preservation of cultural heritage, to the examination of long-term corrosion behaviors in contemporary iron structures, steel within concrete, and nuclear waste disposal plans.

Effect of Graphene Oxide Addition on the Properties of Electrochemically Synthesized Polyaniline-Graphene Oxide Films.

In this work, the electrochemical synthesis of PANI and GO-modified PANI was performed using cyclic voltammetry, varying the amount of GO, 1 mg (PG1), 5 mg (PG5), and 10 mg (PG10) to analyze the effect of the amount of GO on the composite. PANI, PG1, PG5, and PG10 materials were characterized using optical microscopy, SEM, UV-vis, FTIR, Raman, and wettability. A stability test was also carried out by putting the materials to 500 oxidation-reduction cycles using cyclic voltammetry. The synthesis method allowed GO in PANI to be added through a chemical interaction between the two compounds. It was also found that the addition of GO led to an improvement in the hydrophilic character of the composite, which would lead to an improvement in the diffusion of reagents/species when the composites are used in aqueous media processes. The results of the stability test showed that the PG10 material presented a lower % loss of specific capacitance and energy compared with the other materials, which indicates that the GO presence (in the amount specified) improves the stability of the PANI. The PG10 material showed favorable and promising conditions for its use in fuel cell and battery processes.

Numerical modelling of large elasto-plastic multi-material deformations on Eulerian grids

Abstract The paper deals with an Eulerian model for heterogeneous multiphase (multi-material) elasto-plastic media based on the diffuse interface method in the one-dimensional uniaxial strain approximation. In this approximation, an equilibrium hypoelastic Wilkins bi-material model is derived. This is carried out on the basis of an analogy between the elasto-plastic Wilkins and hydrodynamic Euler models. For the obtained model, a Godunov-type numerical method is developed based on the approximate Riemann solver HLLC. The results of the proposed Eulerian diffuse interface model are compared with reference solutions on moving grids with explicit tracking interfaces. It is shown that the present diffuse interface numerical model describes with good accuracy strong shock-wave processes in heterogeneous multiphase elasto-plastic media.

Effects of Social Media on Branding ——The Rise of Creative Advertising Marketing

In the Web2.0 era, social media has developed into the most compelling area in the global media industry and brought online users a fresher experience and more creative network communication application models. Both its social impact and economic development have become the new engine and growth point of the media industry. More and more brands and companies put their advertising budgets on social media advertising, because social media advertising is not only affordable but also able to accurately target the consumer group. The Internet word of mouth formed by social media is reshaping the relationship between brands and consumers. At the same time, the way audiences receive and disseminate information has undergone tremendous changes, and advertising creative communication is also facing huge challenges. This article will analyze the development process and trends of social media from the perspective of its core technology and communication characteristics, and then explore the social-psychological impact and cultural value of social media brought to brand communication.

Finite element modeling of thermal‐hydro‐mechanical coupled processes in unsaturated freezing soils considering air‐water capillary pressure and cryosuction

AbstractThis paper presents a comprehensive computational model for analyzing thermo‐hydro‐mechanical coupled processes in unsaturated porous media under frost actions. The model employs the finite element method to simulate multiphase fluid flows, heat transfer, phase change, and deformation behaviors. A new soil freezing characteristic curve model is proposed to consider the suctions from air‐water capillary pressure and water‐ice cryosuction. A total pore pressure with components from liquid water pressure, air pressure, and ice pressure is used in the effective stress law. Vapor and dry air are considered miscible gases, utilizing the ideal gas law and Dalton's law. The governing equations encompass the linear momentum balance equation, the energy balance equation, and mass conservation equations for water species (ice, liquid, and vapor) and dry air. Weak forms are formulated based on primary variables of displacement, water pressure, air pressure, and temperature. The spatial discretization is achieved through the finite element method, while temporal discretization employs the fully implicit finite difference method, resulting in a system of fully coupled nonlinear equations. To verify the proposed computational model, a numerical implementation is developed and validated against a set of experimental data from the literature. The successful verification demonstrates the robustness of the model. A detailed discussion of the contributions from phase change strain and different sources of pore pressure is also addressed.

Pengembangan Media Pembelajaran Interaktif Berbasis Powerpoint pada Pembelajaran IPAS Materi Ada Apa Saja di Bumi Kita Kelas V

This research aims to produce a Powerpoint-based Interactive Learning Media product for learning science and science material on What's on Our Earth for grade V elementary schools. The research method used is research and development (RnD) by adapting the ADDIE (Analysis, Design, Development, Implementation, Evaluation) development model. The data sources for this research are the results of validation from two validators, the results of student response questionnaires, the results of practicality questionnaires. The data collection techniques for this research are interviews and questionnaires. The research results show that during the development process of PowerPoint-based interactive learning media, it was carried out in five stages, namely the analysis, design, development, implementation and evaluation stages. The validity of PowerPoint-based interactive learning media products in science and science learning, whatever material there is on our earth, class V of SD Negeri 17 Pontianak City obtained an average of 94.9% in the "very feasible" category. The results of student responses obtained "very good" criteria with an average score of 90.2% in limited trials and 93% in wide-scale trials. The practicality results in the limited trial obtained the criteria "very practical" with an average score of 91.2%. In wide-scale trials, an average of 90.5% was obtained in the "very practical" category. Meanwhile, the teacher's practical results obtained an average score of 100% in the "very practical" category.

The media-psychological model of environmental risk perception

The article presents the results of a theoretical analysis on the topic of media-psychological aspects of the perception of environmental risks and the presentation of the author's media psychological model of the impact of media messages on the perception of environmental risks. The presented model examines the processes and stages involved in the initial encounter with environmental risk messages in the media and the further outcomes of their processing which can manifest in information-seeking behaviour. According to the presented model, changes in risk perception are considered a series of stages initiated by attention to information and can continue when information-seeking behaviour is triggered. The main models relied on by the author of this study are the Limited Capacity Model of Motivated Mediated Message Processing to describe media message processing and the Risk Information Search and Processing Model to describe aspects of information-seeking behaviour. Several additional communication models dedicated to the consideration of information behaviour and processing of media messages were also used to describe the processes of mass media influence on the perception of environmental risks. Thus, dual models of information processing and persuasive communication are also considered, including the Heuristic-Systematic Model and the Elaboration Likelihood Model, as well as additional theories examining information-seeking behaviour: the Theory of Motivated Information Management and the Planned Risk Information Seeking Model

Dual-porosity approach: heat transfer and heat storage processes in porous media

ABSTRACT This study emphasizes the significance of understanding groundwater flow behavior for effective contaminant transport and heat storage. Aquifers, with their irregular shapes and variable permeability, exhibit anisotropic flow resistances that affect mass and heat transfer, posing challenges for modeling. The dual-porosity model is used as a numerical approach to calculate macroscopic heat transfer without explicitly resolving the structure. By solving equations for mobile and immobile phases and coupling relevant equations for heat conservation, this model was applied to transient numerical experiments simulating heat transfer and storage in a desktop model filled with glass beads. Results indicate alignment with experimental and numerical models resolving porous structures on the microstructure scale. This methodology offers a comprehensive digital toolbox for solving large-scale heat storage problems in aquifers, contributing to digital and sustainability transformations with reasonable computational demands.