Behavior Of Media Research Articles

Milling efficiency and wear behavior of silicon grinding media in autogenous stirred media milling

This study investigates the wear mechanisms and milling efficiency of silicon as grinding media for autogenous stirred media milling. Fresh autogenous grinding media (aGM) showed an exponentially decreasing wear rate first, while becoming constant at longer grinding times. The wear rate of used aGM was constant throughout the whole milling experiment. Shape and size analysis revealed that chipping and abrasion mechanisms dominate the wear behavior. These mechanisms led to spheroidization of the aGM. The grinding media concentration was introduced as measure for the energy transfer from the stirrer to the product particles. This concept was used for weighting the specific energy consumption. Nanoparticles of around 150 nm were obtained with similar weighted specific energy consumptions, while used aGM performed most efficiently due to their spheroidized shape. Finally, spheroidized aGM still consumed more weighted specific energy than conventional grinding media. However, a direct comparison was difficult due to the different material properties of the grinding media.

Social media behaviors and body type ideals predict weight loss and food tracking behaviors among recreational climbers

Social media behaviors and body type ideals predict weight loss and food tracking behaviors among recreational climbers

Adolescents and negligent social media use

Digital technology has evolved very quickly in a very short space of time, to the point at which it is now a personal technology that manages the information and communications of users who access the different services offered over the Internet - users who are increasingly younger and at greater risk. Negligent technology use is understood as use linked to the management of social media accounts and mobile apps that, while not intentionally harmful, may nevertheless place the user and/or others at risk. The study of negligent digital technology use during adolescence is vital to preventing risk behaviours through education. These types of behaviours range from anxiety to cyberbullying, device addiction, problems with self-perceptions of one's own body and depression, among others. In this context, the aim of the present study is to analyse negligent digital technology use among adolescents on social media, and to explore the perceptions of this population group regarding the seriousness of these actions and the possible relationship between the two variables. Participants were 2529 students aged between 10 and 17 years from seven regions in southern Europe spread across three countries (Spain, Italy and Greece). The instrument used to collect the data was an ad hoc questionnaire designed to measure, among other things, actions indicating negligent use, excessive use of social medial and perceptions of the seriousness of such social media behaviour. The results reveal that the most negligent actions carried out by minors are: arranging to meet people they met on a social media site; displaying personal information in their account; and giving their passwords to people other than their parents and/or teachers. The results also indicate that adolescents engage in those negligent actions that they perceive to be less serious more assiduously, and carry out those they perceive to be more serious more sporadically. One of the principal findings was the increase in negligent use among older adolescents, which suggests that education in this field needs to begin much earlier, ideally before the age of 12 years.

Numerical Study on Fluid Flow Behavior and Heat Transfer Performance of Porous Media Manufactured by a Space Holder Method.

The velocity field and temperature field are crucial for metal foams to be used as a heat exchanger, but they are difficult to obtain through physical experiments. In this work, the fluid flow behavior and heat transfer performance in open-cell metal foam were numerically studied. Porous 3D models with different porosities (55-75%) and pore sizes (250 μm, 550 μm, and 1000 μm) were created based on the porous structure manufactured by the Lost Carbonate Sintering method. A wide flow velocity range from 0.0001 m/s to 0.3 m/s, covering both laminar and turbulent flow regimes, is fully studied for the first time. Pressure drop, heat transfer coefficient, permeability, form drag coefficient, temperature and velocity distributions were calculated. The calculated results agree well with our previous experimental results, indicating that the model works well. The results showed that pressure drop increased with decreasing porosity and increasing pore size. Permeability increased and the form drag coefficient decreased with increasing porosity, and both increased with increasing pore size. The heat transfer coefficient increased with increasing velocity and porosity, whereas it slightly decreased with increasing pore size. The results also showed that at high velocity, only the metal foam close to the heat source contributes to heat dissipation.

Exploring optical solitary wave solutions in the (2+1)-dimensional equation with in-depth of dynamical assessment

The current study explores the (2+1)-dimensional Chaffee-Infante equation, which holds significant importance in theoretical physics renowned reaction-diffusion equation with widespread applications across multiple disciplines, for example, ion-acoustic waves in optical fibres, fluid dynamics, electromagnetic wave fields, high-energy physics, coastal engineering, fluid mechanics, plasma physics, and various other fields. Furthermore, the Chaffee-Infante equation serves as a model that elucidates the physical processes of mass transport and particle diffusion. We employ an innovative new extended direct algebraic method to enhance the accuracy of the derived exact travelling wave solutions. The obtained soliton solutions span a wide range of travelling waves like bright-bell shape, combined bright-dark, multiple bright-dark, bright, flat-kink, periodic, and singular. These solutions offer valuable insights into wave behaviour in nonlinear media and find applications in diverse fields such as optical fibres, fluid dynamics, electromagnetic wave fields, high-energy physics, coastal engineering, fluid mechanics, and plasma physics. Soliton solutions are visually present by manipulating parameters using Wolfram Mathematica software, graphical representations allow us to study solitary waves as parameters change. Observing the dynamics of the model, this study presents sensitivity in a nonlinear dynamical system. The applied mathematical approaches demonstrate its ability to identify reliable and efficient travelling wave solitary solutions for various nonlinear evolution equations.

#Thisis40: Body image among adult women who post selfies

Prior research suggests that using photo-based social media may increase body image concerns among young women. Consumption of versus contribution to social media may moderate this relationship, and the type of content contributed (e.g., self-images or “selfies”) may further account for variations. A critical limitation of the extant scholarship is a lack of attention to understudied groups, such as older women. Using a cross-sectional sample of 238 midlife women (Mage = 50.92), this study investigated the relationship between social media behavior, perceived effects of social media use, and body image indices. Results indicated that our sample of midlife women contributed mainly photos of their current setting and family, contrasting with prior work among younger women. Results suggested that the type of content contributed may be more pertinent to body image than social media behavior generally, and highlighted complex relationships. Posting photos broadly was associated only with lower drive for youthfulness. However, selfie posting specifically was associated with greater facial satisfaction as well as greater positive (e.g., connectedness) and negative (e.g., appearance concerns) perceived effects of social media, but not drive for youthfulness. Results suggest that the type of content contributed to social media may be a particularly important factor for body image, and highlight complex relationships potentially influenced by unmeasured factors such as social media use motivations. Together, these findings contribute to a fuller understanding of social media and body image and call for further theoretically-driven work in this area to guide effective prevention resources.

Investigation of consumer behavior in social media in the handball

Social media exploded onto the scene roughly two decades ago, revolutionising the way we think about marketing communication and the way we think about information delivery. It has opened doors that were unprecedented. It can also be profitable for sports companies if they can deliver effective marketing communications to their existing and potential customers. To be effective in this environment, it is important to analyse consumer behaviour to identify the real needs of users and to meet those needs. We used an online questionnaire to assess the consumer needs of our respondents and the social media market from a marketing perspective. We conducted a handball specific research, excluding individuals who do not follow handball at any level from the study sample. We also looked at age differences, and device usage. Given our results, it can be stated that thorough market research is important for effective marketing communication by a handball club on different social media platforms.

A Study of Youth's Engagement Behavior in Transnational Media in an Intercultural Context: Taking Volleyball in China and Japan as an Example

In the era of globalization, intercultural communication studies have emerged as a focal point of research. Analyzing interactions and exchanges across cultures offers deeper insights into the intricate dynamics of cultural and social evolution. Sports, especially volleyball, serve as a bridge between nations, facilitating mutual understanding and cooperation. The significance of volleyball exchanges between China and Japan is unmistakable, representing a crucial aspect of bilateral sports diplomacy. Against this background, it is imperative to delve into the identity sentiments of youth towards their engagement with Chinese and Japanese volleyball media in an intercultural context. This exploration not only provides insights into the values and cultural leanings of the younger generation but also clarifies the intricate influence of these factors on cultural dissemination. The findings reveal that youths' enthusiasm for sports and their individual attributes directly impact their participation in Japanese volleyball media. Moreover, this influence is modulated by a sense of intercultural identity, reflecting a complex interplay between personal attributes, cultural affiliations, and media engagement. Additionally, the widespread use of social media emerges as a key factor, intersecting with intercultural identity to shape youths' engagement with volleyball media. By exploring this topic, this paper can help gain a deeper understanding of the intricate relationships between personal identity, cultural affiliations, and media consumption among young individuals, specifically within the realm of volleyball media in China and Japan.

Japanese National Basketball Association Fans and Social Media Acceptance: Exploring the Role of Brand Respect

This study explores the factors influencing satellite sport fans’ social media engagement, focusing on Japanese National Basketball Association (NBA) fans. Using the technology acceptance model and Brand Respect Scale, we analyzed the effects of perceived usefulness, perceived enjoyment, and perceived trustworthiness on social media stickiness and investigated the mediating roles of brand trust, brand performance, brand acceptance, and brand reputation. A partial least squares structural equation modeling analysis of data from 813 Japanese NBA fans revealed that perceived usefulness and enjoyment significantly affected social media stickiness, while perceived trustworthiness indirectly influenced this stickiness through brand trust and acceptance. The study advances the theoretical understanding of social media behavior among satellite sport fans and provides practical implications for optimizing social media strategies to enhance fan engagement. Our findings offer valuable insights for sport teams and organizations seeking to strengthen their connection with geographically distant fans. In addition, this research paves the way for future studies to encompass diverse age groups, sports, and regions to offer a more comprehensive understanding of the factors influencing satellite sport fans’ social media engagement.

Effect of grinding media shape on the particle size distribution of UG2 ore using the response surface methodology central composite design

In this study, the effects of truncated ellipsoids and cubes on the particle size distribution of a UG2 ore were compared to the spheres using the response surface methodology for experimental design, modeling, and optimization. The response surface methodology demonstrated that it can be useful in optimizing grinding operations. It provides lenses to see and analyze the behavior of the ball filling, interstitial filling, and % solids parameters which are complex and interactive, and their effects on the production of the desired product (−75 µm) for different grinding media. Spherical grinding media outperformed truncated ellipsoids and cubes, producing the highest amount of the desired size class (82.58%), followed by 80.41% for truncated ellipsoids and 77.07% for cubes. Spheres also consumed the least power followed by cubes and lastly truncated ellipsoids. The differences in optimal grinding conditions were attributed to different contact mechanisms, surface area, and load behavior of the grinding media.

Exploring freedom in mobile connectivity: a moderated mediation model linking mobile social media modes, availability pressure, and media habits

In an era where mobile phone use is ubiquitous, being constantly available has become a prevalent norm. Grounded in the sociocognitive model of connectedness (SMC), this study examines the relationship between availability pressure and habitual checking of mobile social media while probing the moderating role of social media notifications in this relationship. Crucially, our study extends the SMC framework by investigating the various impacts of mobile social media modes on availability pressure and the habitual checking of mobile social media. The findings reveal a positive relationship between availability pressure and habitual checking, as well as the role of availability pressure in mediating the effects of voice calls and text messages on habitual checking of mobile social media. The moderated mediation model also reveals that the mediating effect of availability pressure is strengthened by an increase in social media notifications when individuals use voice calls and text messages to interact with friends on mobile social media. This research underscores the complex interplay among mobile social media modes, availability pressure, and social media notifications in shaping habitual media behaviors.

To disclose or to protect? Predicting social media users’ behavioral intention toward privacy

PurposeIn the paradox of personalized services and privacy risks, what factors influence users’ decisions is considered an interesting issue worth exploring. The current study aims to empirically explore privacy behavior of social media users by developing a theoretical model based on privacy calculus theory.Design/methodology/approachPrivacy risks, conceptualized as natural risks and integrated risks, were proposed to affect the intention of privacy disclosure and protection. The model was validated through a hybrid approach of structural equation modeling (SEM)-artificial neural network (ANN) to analyze the data collected from 527 effective responses.FindingsThe results from the SEM analysis indicated that social interaction and perceived enjoyment were strong determinants of perceived benefits, which in turn played a dominant role in the intention to disclose the privacy in social media. Similarly, trust and privacy invasion experience were significantly related to perceived risks that had the most considerable effect on users’ privacy protection intention. And the following ANN models revealed consistent relationships and rankings with the SEM results.Originality/valueThis study broadened the application perspective of privacy calculus theory to identify both linear and non-linear effects of privacy risks and privacy benefits on users’ intention to disclose or protect their privacy by using a state-of-the-art methodological approach combining SEM and ANN.

A Novel Collagen Aerogel with Relevant Features for Topical Biomedical Applications.

Collagen-based aerogels have great potential for topical biomedical applications. Collagen's natural affinity with skin, biodegradability, and gelling behavior are compelling properties to combine with the structural integrity of highly porous matrices in the dry form (aerogels). This work aimed to produce a novel collagen-based aerogel and to perform the material's solid-state and physicochemical characterization. Aerogels were obtained by performing different solvent exchange approaches of a collagen-gelled extract and drying the obtained alcogels with supercritical CO2. The resulting aerogels showed a sponge-like structure with a relatively dense mesoporous network with a specific surface area of 201-203 m2/g, a specific pore volume of 1.08-1.15 cm3/g, and a mean pore radius of ca. 14.7 nm. Physicochemical characterization confirmed that the obtained aerogels are composed of pure collagen, and the aerogel production process does not impact protein tertiary structure. Finally, the material swelling behavior was assessed at various pH values (4, 7, and 10). Collagen aerogels presented a high water uptake capacity up to ~2700 wt. %, pH-dependent stability, and swelling behavior in aqueous media. The results suggest that this collagen aerogel could be a promising scaffold candidate for topical biomedical applications.

Media and Natural Disasters: Organising Storytelling in the Age of Climate Change

Starting on 2 November 2023, some territories in the Region of Tuscany in Italy were hit by exceptionally intense meteorological and calamitous events. The Region of Tuscany’s government was immediately at the forefront of relief, assisting the population, and aiding restoration. On 3 November, a national state of emergency was declared due to flooding. Journalistic communication is an essential aspect of disaster mitigation, preparedness, response and recovery. In terms of protecting people and reducing damage, journalists and the media have an important role to play. This article reports an Italian case study analysing the behaviour of local media in cases of natural disaster. Nine focus groups were conducted with local journalists covering the flood emergency. The results highlight the role of social and institutional mediation, rather than mere dissemination, played by the local press in emergency situations, a central element in the construction of a community bond, precisely in moments of insecurity and disorientation. The narration of a disaster from the inside seems to have allowed the emergence and representation of hitherto unknown social realities in Tuscany. The goal of the news coverage was widened, making it possible to respond better to the diverse interests of the reading public and to satisfy in a short time and exhaustively the information needs of individual communities in difficulty.

Experimental and Simulation Studies on Stable Polarity Reversal in Aged HVDC Mass-Impregnated Cables

Mass-impregnated (MI) cables have been used for many years as cables in high-voltage direct current (HVDC) systems. In line commutated converter (LCC) HVDC systems, polarity reversal for power flow control can induce significant electrical stress on MI cables. Furthermore, the mass oil and kraft paper comprising the impregnated insulation have significantly different coefficients of thermal expansion. Load fluctuations in the cable lead to expansion and contraction of the mass, creating pressure within the insulation and causing redistribution of the impregnant. During this process, shrinkage cavities can form within the butt gaps. Since the dielectric strength of the cavities is lower than that of the surrounding impregnation, cavitation phenomena in impregnated paper insulation are considered a factor in degrading insulation performance. Consequently, this study analyzes the electrical conductivity of thermally aged materials and investigates the transient electric field characteristics within the cable. Additionally, it closely analyzes the formation and dissolution of cavities in MI cables during polarity reversal based on a numerical model of pressure behavior in porous media. The conductivity of the impregnated paper indicates that it has excellent resistance to thermal degradation. Simulation results for various load conditions highlight that the interval of load-off time and the magnitude of internal pressure significantly influence the cavitation phenomenon. Lastly, the study proposes stable system operation methods to prevent cavitation in MI cables.

Party competition on social media: Evidence from politicians' tweets

AbstractA blooming research agenda has begun examining the influence of party competition dynamics on politician social media behaviour. Most studies focus on the US context, generally finding little evidence that party competition dynamics influence which policy issues politicians attend to on these platforms. Instead, I turn to the Danish context and show how party competition dynamics exert a substantial influence on politicians' attention to issues in their tweets. First, I map the level of politician issue attention on Twitter across several years outside election campaigns. Second, I show that party issue ownership and the status of a party as a government or opposition party strongly influence politicians' attention to issues on the platform. Third, I provide novel insights into how the interplay between party issue ownership and internal party organisation influences politician issue attention on Twitter. The findings indicate that the tweets posted by politicians are an integral aspect of contemporary party competition.

Optical soliton solutions in a distinctive class of nonlinear Schrödinger’s equation with cubic, quintic, septic, and nonic nonlinearities

The Biswas–Mollivic equation is a special type of nonlinear Schrödinger equation, which explains the spatio-temporal behaviour of excitable media. In this paper, we investigate the optical soliton solutions of the Biswas–Mollivic equation with cubic–quintic–septic–nonic nonlinearities using the generalized Riccati equation mapping method. This method is efficient and provides new perspectives. It also provides novel insights into the dynamics of excitable media. Our findings add to a better understanding of the complex spatio-temporal patterns that develop in excitable media and have potential applications in the design of new technologies for controlling and manipulating pattern formation. To depict optical soliton solutions graphically, we use the MATLAB software.

Social media use among adolescents with acne: A cross-sectional survey study.

Social media is increasingly used by patients for the management of skin conditions like acne, despite the potential risk for low-quality information. This study surveyed 45 participants between the ages of 12 and 17 years to investigate factors that could be associated with social media use among adolescents with acne. The likelihood of social media use was not significantly increased by clinical severity of acne, more severe physical barriers (greater than or equal to 20 miles to the dermatology clinic), more severe temporal barriers (waiting 12 or more weeks for a first dermatology appointment), or worsened quality of life (assessed via the Skindex-Teen score). This study increases understanding of adolescents' social media behaviors, particularly as a way to seek information for skin conditions like acne.

Introducing the area under stress–velocity curve: Theory, measurement and association with rock properties

AbstractSince many years ago, ultrasonic velocity has been used to investigate the physical and mechanical behaviour of rocks, thereby playing an important role in reservoir characterization and seismic interpretation. In order to develop the knowledge of ultrasonic tools, we performed a noble analysis on the ultrasonic behaviour of rocks under confining stress and evaluated a distinctive property of porous media that is measured as the area under the stress–velocity curve (here defined as S*). We further investigated its relationship with elastic and mechanical behaviours of rock. To validate the theoretical framework developed in this work, 20 core plugs from various rock units with complex microstructures were subjected to triaxial compressional tests to calculate their area under the curve. Calculations were made for crack‐closing, elastic and post‐elastic stages (e.g. pore collapse) along the ultrasonic velocity–stress curve. Moreover, the selected samples had their microstructure investigated by thin‐section studies to quantify their porosity and pore type. The results were analysed to check for the effect of pore type on S* in different stages of the stress–velocity curve. Based on the outputs of the analysis of variance and Pearson's correlation coefficient analysis, the curve had its shape and underlying area closely related to the porosity and pore geometry. Indeed, the results showed that the shale and sandstone with micro cracks and carbonate with stiff pores correspond to smaller and larger areas under the curve in crack‐closing and inelastic stages, respectively. Cross‐correlating the results to compressibility (inverse of bulk modulus), it was figured out that the calculated area under curve was well consistent with the compressibility. In addition, S* represents both static and dynamic behaviours of the rock, and the results revealed that the shape and curvature of the stress–velocity curve give valuable information about the rock microstructure. Another finding was the fact that the type of fluid and wave velocity seemingly affect the S*. Our findings can help interpret wave velocity behaviour in reservoir rocks and other stressful porous media.

Non-Integer Dimensional Analysis of Ultrasonic Wave Propagation in Fractal Porous Media

This paper explores the acoustics of porous media characterized by fractal, or self-similar, structures. Employing a fractal approach, we use differential operators in non-integer dimensional spaces to address the fundamental equations of acoustics in such media. The primary aim is to examine the transmission of ultrasonic waves within a fractal porous medium. Our findings reveal that the fractal dimension significantly influences wave transmission. In fractal porous materials, waves travel along more complex and intricate paths, resulting in increased tortuosity and attenuation. We introduce the concept of an effective path length leff , which is dependent on the fractal dimension Dx , to describe the actual trajectory of wave propagation. Additionally, we define an effective tortuosity αDx , directly proportional to leff2 , to quantify the additional tortuosity brought about by the fractal structure. The insights gained from this study are crucial, as they enhance our understanding of wave behavior in self-similar porous media, which are prevalent in various natural settings and have multiple practical applications, including sound insulation and the design of acoustic materials. Furthermore, understanding the impact of fractal dimensions on wave behavior is vital for developing more efficient acoustic solutions. This research also sets the stage for further theoretical and experimental work on applying fractal geometry to analyze wave propagation in porous structures.