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Content available remote Flexural stability analysis of stiffened plates using the finite element method
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EN
A four-noded stiffened plate element has been developed which has all the advantages and efficiency of an isoparametric element to model arbitrary shaped plates, but without the disadvantage of the shear-locking problem inherent in the isoparametric element. Another unique feature is that the arbitrary placement of the stiffener inside the plate element is without any restriction of its orientation. The boundary conditions have been incorporated in a general manner so as to accommodate the curved as well as the straight-edged boundaries. The element has been used for stability analysis of arbitrary shaped stiffened plates.
EN
This paper addresses pricing, replenishment policies, coordination, and issues of surplus profit division among the members of the dual-channel supply chain for a particular product whose unit cost decreases continuously over product’s life time. In the dual-channel setting, manufacturer, distributor, and retailer with retail channel and the manufacturer’s direct e-channel are considered. When manufacturer is a Stackelberg leader, the paper reveals that the channels are bound to compete with each other on price severely in the centralized as well as decentralized system. It is observed that more preference on the retail channel may lead to non coexistence of profitable retail-e-tail channel which results in a threshold for higher retail price than the online price. The mechanism of all unit quantity discount with agreement of franchise fee coordinates the channel and provides for the win-win outcome. Finally, Nash bargaining over product depicts particular profit division among the channel members. A numerical example is provided in order to test and justify the proposed model.
EN
Background. Internet can act as an excellent resource for gaining valuable health related information. However, excessive online research and investigation about health-related issues may impose a negative impact. The term cyberchondria is used to describe a clinical condition in which frequent internet searches for health-related information leads to exaggerated anxieties about physical well-being. Objectives. To determine the prevalence of cyberchondria and associated factors among the information technology professionals of Bhubaneswar in India. Materials and methods. A cross-sectional study was carried out among 243 software professionals in Bhubaneswar using a previously validated Cyberchondria Severity Scale (CSS-15) questionnaire. Descriptive statistics in terms of number, percentage, mean and standard deviation were presented. Independent t-test and one-way analysis of variance was applied to compare the cyberchondria score between two and more than two independent variables respectively. Results. From 243 individuals 130 (53.5%) were males and 113 (46.5%) were females with mean age 29.82±6.67 years. The prevalence of cyberchondria severity was found to be 46.5%. The mean cyberchondria score of all study subjects was 43.80±10.62. It was significantly higher among those who spend more than 1 hour in the internet during night, feel fear and anxiety in visiting the doctor or dentist, interested in gaining the health-related information from other resources and agreed that gaining health related information has increased after COVID-19 pandemic (p˂0.05). Conclusion. Cyberchondria is a growing issue with regard to mental health in developing countries and has the ability to cause anxiety and distress. Appropriate actions must be taken to prevent it on a societal level.
EN
Background. Considered a modern phobia, Nomophobia (NO MObile PHOne PhoBIA) is a term describing irrational fear or anxiety of being unable to access one’s own mobile phone. Objectives. To develop and validate the nomophobia questionnaire, administering it to a sample of adolescents representing undergraduate dental students. To assess the prevalence of Nomophobia, determine the usage pattern of mobile phones and evaluate the impact due to lack of access to mobile phones among undergraduate dental students. Material and method. A cross-sectional study was conducted on 302 undergraduate students of Bhubaneswar through a self-administered questionnaire via Google Forms consisting of 19 items evaluating the pattern and anxiety related to usage of mobile phones. Responses were recorded on a 5-point Likert scale. Kruskal Wallis, Mann-Whitney U and Chisquare tests were used for statistical analysis. Results. Test-Retest reliability showed kappa of k=0.86 and Internal consistency Chronbach’s-Alpha to be α=0.82. Prevalence of nomophobia (score ≥ 58) was 32.1%, and students at risk of being nomophobic (score 39-57) was 61.9%. It was highest in males (32.6%) and amongst the interns (41.9%) and lowest (25.5%) amongst the second-year students. Participants felt nervous/insecure if their phones were away from them because of the fear that somebody might have accessed their data (3.07±1.93) and or tried to contact them (3.09±1.13) which were not statistically significant (p>0.05). Conclusions. The present study confirms that nomophobia is an emerging behavioural addiction among dental students. Adequate prevention strategies would be helpful in reducing the impact of the chronic mobile usage. Effect of the mobile phone on dental students and the fear of not having it with them is increasing elaborately, that needs to be controlled. Otherwise, it would negatively affect their academic achievement and well-being.
EN
Hydraulic blind backfilling is used to reduce subsidence problems above old underground water-logged coal mines. This paper describes experimental research on a fully transparent model of a straight underground mine gallery. An automatic data acquisition systemwas installed in the model to continuously record the sand and water flowrates along with the inlet pressure of the slurry near the model's inlet. Pressure signature graphs and pressure loss curves with bed advancement under different flow conditions are examined. Pressure signature analyses for various flowrates and sand slurry concentrations are conducted to evaluate a pre-jamming indication parameter, which could be used to indicate the arrival of the final stage of filling.
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