Telepresence robots are meant to provide physical access to digital remote spaces. However, they have a range of limitation that make spaces less accessible for remote participants. In this study we reveal, catalogue, and examine telepresence limitations in the context of the classroom. Based on ongoing field study results from participatory observations, surveys and interviews with 22 participants we discuss the extent to which telepresence robots make the classroom accessible and whether the telepresence robots are "disabled."

Abstract The presence of thermocapillary (Marangoni) convection in microgravity may help to enhance the heat transfer rate of phase change materials (PCMs) in space applications. We present a three-dimensional numerical investigation of the nonlinear dynamics of a melting PCM placed in a cylindrical container filled with n-octadecane and surrounded by passive air. The heat exchange between the PCM and ambient air is characterized in terms of the Biot number, when the air temperature has a linear profile. The effect of thermocapillary convection on heat transfer and the topology of the melting front is studied by varying the applied temperature difference between the circular supports and the heat transfer through the interface. The evolution of Marangoni convection during the PCM melting leads to the appearance of hydrothermal instabilities. A new mathematical approach for the nonlinear analysis of emerging hydrothermal waves (HTWs) is suggested. Being applied for the first time to the examination of PCMs, this procedure allows us to explore the nature of the coupling between HTWs and heat gain/loss through the interface, and how it changes over time. We observe a variety of dynamics, including standing and travelling waves, and determine their dominant and secondary azimuthal wavenumbers. Coexistence of multiple travelling waves with different wavenumbers, rotating in the same or opposite directions, is among the most fascinating observations.

The goal of this study is to raise awareness about the various risks associated with gambling. It will focus on the effects of gambling addiction on gambling intention and its implications for financial wellbeing. It is known from previous research that gambling influences the family’s functioning, as well as the work-related aspects of the individual’s life. The negative effects gambling has on the workplace are more severe, such as decreased work efficiency and theft. We were curious about these effects in Bosnia and Herzegovina as a country with many customers of gambling services. The rise of Internet and social media platforms has led to an increase in the number of people gambling. Our findings indicated that gambling addiction has statistically significant positive effects on gambling intention which consequentially has statistically significant, but negative effects on financial wellbeing of individuals. Considering this empirical evidence, we can recommend to related governmental and non-governmental institutions of Bosnia and Herzegovina to put this issue on their agenda and raise the awareness of society on negative effects of gambling addiction and gambling intention. On the other hand, we recommend future researchers to focus more on this important research problem and in that way provide foundations for solving the related social problem.

Little is known about vaginal and uterine bacteria in clinically healthy cats and their correlation with different stages of the oestrus cycle. The differences in vaginal bacterial flora between household and stray queens remains unknown. The aim of this study was to investigate the occurrence of vaginal and uterine bacteria in clinically healthy household and stray queens and to correlate culture findings with specific stages of the oestrous cycle. Vaginal and uterine samples from 40 clinically healthy queens were collected for isolation of bacteria and cytological examination. Bacteria were isolated from 31 vaginal swabs (77.5%) from stray (16/20; 80%) and household (15/20; 75%) cats. The isolates were more frequently detected in pure culture (18/31; 58%) than in mixed cultures (13/31; 41.9%). Streptococcus spp. was the most commonly identified bacteria (n = 16; 51.6%), followed by coagulase negative Staphylococcus spp. (n = 15; 48.4%) and E. coli (n = 12; 38.7%). A mixed bacterial culture of E. coli and Streptococcus spp. was commonly detected (50%), mainly in households (66.7%), whereas a mixed culture of Staphylococcus spp. and Streptococcus spp. (41.6%) was commonly isolated from stray cats (60%).  The frequency of isolation of pure or mixed bacterial cultures and the isolates did not vary significantly during the different stages of the oestrus cycle. All uterine samples tested were negative for bacteria. This study identified the most common bacteria in the vagina of clinically healthy cats. The isolation of vaginal bacteria in pure or mixed cultures should be considered as normal finding. The stage of the oestrous cycle apparently does not affect vaginal bacterial flora. Vaginal bacteria may differ between stray and households cats. No bacteria can be isolated from the uterus of clinically healthy cats.

Green supplier selection is always one of the most important challenges in all of supply chain management, especially for production companies. The purpose is to have reliable suppliers which can fulfill all requests and be flexible in any supply chain stage. The aim of this paper is to create an adequate and strong MCDM (multicriteria decision making) model for the evaluation and selection of suppliers in a real environment. The main contribution of this study is proposing a novel fuzzy–rough MCDM model containing extension stepwise weight assessment ratio analysis (SWARA) and additive ratio assessment (ARAS) methods with fuzzy–rough numbers (FRN). The integrated FRN SWARA–FRN ARAS model was implemented in a case study of eco-friendly material production. The FRN SWARA method was used to calculate the weights of 10 green criteria, while using FRN ARAS, 6 suppliers were evaluated. The results of the applied model show that supplier S3 received the highest ranking, followed by supplier S2, while supplier S5 performed the poorest. In order to verify the strengths of the developed fuzzy–rough approach, we created a comparative analysis, sensitivity analysis, and dynamic matrix, which confirm the robustness of our model.

Psychedelic drugs can aid fast and lasting remission from various neuropsychiatric disorders, though the underlying mechanisms remain unclear. Preclinical studies suggest serotonergic psychedelics enhance neuronal plasticity, but whether neuroplastic changes can also be seen at cognitive and behavioural levels is unexplored. Here we show that a single dose of the psychedelic 2,5-dimethoxy-4-iodoamphetamine ((±)-DOI) affects structural brain plasticity and cognitive flexibility in young adult mice beyond the acute drug experience. Using ex vivo magnetic resonance imaging, we show increased volumes of several sensory and association areas one day after systemic administration of 2mgkg−1 (±)-DOI. We then demonstrate lasting effects of (±)-DOI on cognitive flexibility in a two-step probabilistic reversal learning task where 2mgkg−1 (±)-DOI improved the rate of adaptation to a novel reversal in task structure occurring one-week post-treatment. Strikingly, (±)-DOI-treated mice started learning from reward omissions, a unique strategy not typically seen in mice in this task, suggesting heightened sensitivity to previously overlooked cues. Crucially, further experiments revealed that (±)-DOI’s effects on cognitive flexibility were contingent on the timing between drug treatment and the novel reversal, as well as on the nature of the intervening experience. (±)-DOI’s facilitation of both cognitive adaptation and novel thinking strategies may contribute to the clinical benefits of psychedelic-assisted therapy, particularly in cases of perseverative behaviours and a resistance to change seen in depression, anxiety, or addiction. Furthermore, our findings highlight the crucial role of time-dependent neuroplasticity and the influence of experiential factors in shaping the therapeutic potential of psychedelic interventions for impaired cognitive flexibility.

Psychedelic drugs can aid fast and lasting remission from various neuropsychiatric disorders, though the underlying mechanisms remain unclear. Preclinical studies suggest serotonergic psychedelics enhance neuronal plasticity, but whether neuroplastic changes can also be seen at cognitive and behavioural levels is unexplored. Here we show that a single dose of the psychedelic 2,5-dimethoxy-4-iodoamphetamine ((±)-DOI) affects structural brain plasticity and cognitive flexibility in young adult mice beyond the acute drug experience. Using ex vivo magnetic resonance imaging, we show increased volumes of several sensory and association areas one day after systemic administration of 2mgkg−1 (±)-DOI. We then demonstrate lasting effects of (±)-DOI on cognitive flexibility in a two-step probabilistic reversal learning task where 2mgkg−1 (±)-DOI improved the rate of adaptation to a novel reversal in task structure occurring one-week post-treatment. Strikingly, (±)-DOI-treated mice started learning from reward omissions, a unique strategy not typically seen in mice in this task, suggesting heightened sensitivity to previously overlooked cues. Crucially, further experiments revealed that (±)-DOI’s effects on cognitive flexibility were contingent on the timing between drug treatment and the novel reversal, as well as on the nature of the intervening experience. (±)-DOI’s facilitation of both cognitive adaptation and novel thinking strategies may contribute to the clinical benefits of psychedelic-assisted therapy, particularly in cases of perseverative behaviours and a resistance to change seen in depression, anxiety, or addiction. Furthermore, our findings highlight the crucial role of time-dependent neuroplasticity and the influence of experiential factors in shaping the therapeutic potential of psychedelic interventions for impaired cognitive flexibility.

To provide seamless wireless coverage, the framework integrating the air network and the ground heterogeneous network has attracted extensive attentions. In this work, we develop a non-orthogonal multiple access (NOMA) assisted air-to-ground (A2G) communication-caching-charging (3C) integrated network. Specifically, we propose a resource allocation strategy to minimize the transmission latency of ground users. Since the formulated problem is difficult to solve directly, it is decomposed into three sub-problems, user pairing, user power allocation and file power allocation. Firstly, we propose a user clustering and pairing strategy according to the distance and channel gain. Secondly, the closed-form solution for the power allocation of files to maximize the duration for energy harvesting is derived. Thirdly, we apply genetic algorithm (GA), which can search for the global optimal solution, to obtain the power allocation factors for users to maximize the rate. Finally, simulations evaluate the superiority of the developed network and the proposed strategy in reducing user delay.

The aim of this randomized controlled trial was to analyze the effects of medium-term supplementation with hydrogen-rich water on brain metabolism, appetite-regulating hormones, body composition, and safety biomarkers in overweight adults. Twenty (n = 20, 10 females) apparently healthy adults with a body mass index >24.9 kg/m2 were assigned to receive 0.5 L per day of hydrogen-rich water (7.5 mg of hydrogen) or hydrogen-free water (tap water) for 12 weeks. Two-way analysis of variance with repeated measures revealed a significant difference between the two interventions in several body composition indices (P ≤ 0.05), with hydrogen-rich water superior to placebo to reduce waist circumference and mid-upper arm circumference by 1.31 cm (95% confidence interval, from –0.23 to 2.85) and 0.65 cm (95% confidence interval, from –0.10 to 1.40), respectively. Hydrogen-rich water outcompeted placebo to raise serum ghrelin levels, as the mean difference from the placebo group was 17.28 pmol/L (95% confidence interval, from 1.81 to 32.75) (P = 0.02). A non-significant strong positive trend (P = 0.10) was reported toward hydrogen-rich water being superior to placebo in augmenting total serum short-chain fatty acid levels, with a mean difference from the control group of 195.6 μmol/L (95% confidence interval, from –64.55 to 275.85). The mean fecal calprotectin levels were significantly reduced after hydrogen-rich water intervention for 19.7 μg/mg (95% confidence interval, from 0.31 to 39.09) (P = 0.03). Our findings advance hydrogen-rich water as a promising metabolic intervention in overweight adults, but further validation via multicentric longitudinal randomized controlled trials in metabolic and nutritional disorders is required.

This study aims to analyze the perception of travel, especially in the context of the pandemic, when the measures are alleviated, as well as the citizens’ intentions and preferences for travel methods during the COVID-19 pandemic. The purpose of the study is to investigate the impact of the COVID-19 pandemic on travel behavior and travel mode preferences in the example of the residents of Bosnia and Herzegovina. Five research questions were defined. A quantitative research approach was applied in this study. The data were collected through a questionnaire (online survey) distributed to respondents via e-mail and the social network Facebook. The convenience sample included 265 respondents. In the study, a descriptive and quantitative comparative analysis was conducted. The results show that the COVID-19 pandemic has influenced a change in travel behavior. The primary purpose of travel during and before the pandemic was social activities. The most significant change in the primary purpose of travel during and before the pandemic is reflected in a decrease in social activities and an increase in recreational sports activities. In contrast, other activities remained proportionally the same before and during the COVID-19 pandemic. The average distance traveled for primary outdoor trips before the pandemic is greater than that for primary outdoor trips during the COVID-19 pandemic. The results of this study could be useful in traffic planning and making various policies during various pandemics based on people’s travel needs. In particular, government bodies could use such knowledge to plan partial and smarter lockdowns. Tourism and transport companies could use this information to better plan their services and operations.

Skeniranje slika i pretvaranje skeniranih informacija u digitalni format je aktivna oblast istraži­vanja. Skeniranje je automatizovan, brz i efikasan proces u poređenju sa tradicionalnim unosom podataka. Prepoz­navanje cifara sa slika je izazovan zadatak. Tradicionalni pristupi za rešavanje ovog problema obično razdvajaju korake lokalizacije, segmentacije i prepoznavanja. Ovaj rad predstavlja jedinstven pristup koji integriše ova tri koraka korišćenjem duboke konvolucione neuronske mreže koja radi direktno na pikselima slike.

Human papillomavirus (HPV) infection is one of the most common viral infections in sexually active population worldwide, and is the main cause of cervical cancer, which is the fourth most common cancer among women. Serbia ranks third in incidence and mortality rate of cervical cancer in Europe. We conducted a cross-sectional study considering parents’ motivation for the HPV vaccination of their children. Statistical analysis included descriptive statistics and a logistic regression model. We found that the strongest motive was “Recommendation from paediatrician” (20.2%), followed by the attitude that HPV vaccine protects against cancers in different localization (15.4%), the motive “It is better to vaccinate a child than expose them to potential risk of HPV infection” (13.3%) and “Feeling anxiety due to a possible infection and cancer in the child” (13.1%). For those parents that vaccinated their child for some other strongest motive, reasons like “Vaccine is free of charge”, “Recommendation from friends and family” and motive „My child received all obligatory vaccines, so I want to receive this one as well“, were significantly more frequently selected. In the group where paediatricians’ recommendation was not a motive for accepting the HPV vaccine, the largest percentage of parents (89.6%) selected motive “HPV vaccine protects against cancers in different localization” and the motive “It is better to vaccinate a child than expose them to potential risk of HPV infection” (78.1%). Paediatrician’s recommendation is very important for parents’ decision to vaccinate, however, other motives also influenced and had significance in making the parents’ decision to vaccinate their children against HPV. Encouraging trust in public health authorities in Serbia, highlighting the advantages of the HPV vaccine and further encouraging healthcare workers to give stronger recommendations can increase the HPV vaccine uptake. Finally, we provided the basis to create more targeted messages that will empower parents to vaccinate their children.