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People's day-to-day routines have changed drastically since the outbreak of the COVID-19 pandemic. One of the changes to take place has been the transition to online learning due to the changing conditions in learning environments. One of the factors that guide students through learning environments is their emotions. The few existing scales that measure the emotions of adolescents in learning environments have been developed with consideration of face-to-face learning environments and their items do not adequately express the state of online environments. For this reason, this study aimed to develop a scale which reveals the emotions of adolescents that may affect their academic success with regard to this transition of learning environments as they attend online lessons. A total of 3,655 middle and high school students living in Istanbul, Turkey, participated in the study. The scoring system was designed with regard to the frequency with which each student reading an item experiences the relevant emotion for the item in the online learning environment. Exploratory and confirmatory factor analyses conducted show the scale to possess a four-dimensional structure. These dimensions are enjoyment-pride, boredom-hopelessness, loneliness and anxiety. For all dimensions of the scale, Cronbach alpha values range between.93 and.83. 'Positive and Negative Affects Schedule-Children' was used to confirm the scale's criterion-related validity, and correlations between dimensions were examined. After validity and reliability studies, the Adolescent Emotion Scale for Online Lessons was found to be sufficient. The scale can be used by experts and teachers who wish to determine adolescents' emotions during a period of online learning. [ABSTRACT FROM AUTHOR]

Introduction: Cholecystectomy for symptomatic cholecystitis is one of the common surgical procedures in the geriatric patients. Increased gallbladder wall thickness is expected due to acute cholecystitis and in some other clinical conditions. Routine histopathological evaluation of cholecystectomy materials are required to confirm the diagnosis and document other pathologies. The aim of this study was to evaluate age-related histopathological gallbladder morphometric measurements. Methods: A retrospective chart review of 371 cholecystectomy materials was performed. Two groups were designed according to age (<65 and ≥65 years old, respectively). Age and gender analyses for histopathological gallbladder length, diameter and wall thickness were performed. In addition, pathologically confirmed acute inflammation rates were evaluated in this case-control study. Results: Gallbladder morphometric measurements and pathologically confirmed acute inflammation rates were similar in males and females. Histopathological gallbladder diameter was higher with acute inflammatory changes, but no differences were observed in gallbladder length and wall thickness. Gallbladder wall thickness and pathologically confirmed acute inflammation rates were not comparable between the control and geriatric patients (2.8 ± 1.3 vs 2.6 ± 1.2 mm, and 30/281 (10.7 %) vs 10/74 (13.5 %), respectively, p > 0.05). However, higher gallbladder length and diameter were observed in geriatric group. Conclusion: Age is an independent factor on histopathological gallbladder length and diameter, but not for gallbladder wall thickness. In addition, pathologically confirmed acute inflammation rate is not higher in geriatric patients. Clinical significance of these findings merits further investigation. [ABSTRACT FROM AUTHOR]

The present study is concerned with the out-of-plane vibrations of a rotating, internally damped (Kelvin-Voigt model) Bernoulli-Euler beam carrying a tip mass. The centroid of the tip mass, possessing also a mass moment of inertia is offset from the free end of the beam and is located along its extended axis. This system can be thought of as an extremely simplified model of a helicopter rotor blade or a blade of an auto-cooling fan. The differential eigenvalue problem is solved by using Frobenius method of solution in power series. The characteristic equation is then solved numerically. The simulation results are tabulated for a variety of the nondimensional rotational speeds, tip mass, tip mass offset, mass moment of inertia and internal damping parameters. These are compared with the results of a conventional finite element modeling as well, and excellent agreement is obtained. Some numerical results are given in graphical form. The numerical results obtained, indicate clearly that the tip mass offset and mass moment of inertia are important parameters on the eigencharacteristics of rotating beams so that they have to be included in the modeling process. [ABSTRACT FROM AUTHOR]

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