FLEXURAL STRENGTH OF FIBROUS ULTRA HIGH PERFORMANCE REINFORCED CONCRETE BEAMS

ABSTRACT The flexural behavior of eleven 150×150×1950 mm ultra high performance conventionally reinforced concrete beams containing hooked and crimped steel fibers with different volume fractions (0.5%, 0.75% and 1%) in full and partial depths of beams cross sections is studied in this investigation. The load deflection relationship, resilience, toughness indices, first crack load, ultimate load and concrete strains were investigated. The experimental results show that the addition of steel fibers slightly enhances the load-deflection relationship and ultimate load for beam specimens. The type of steel fibers (crimped and hooked) has a little effect on load-deflection behavior, ultimate moment capacity, cracking pattern, while in resilience and toughness, beam specimens with hooked steel fiber showed slightly better behavior than those with crimped steel fibers. The ultimate tensile strength of beams has been rederived and contributed in order to calculate the moment capacity. The calculated ultimate moment capacity was in good agreement with the experimental ultimate moment capacity

Why do some followers remain silent in response to abusive supervision? A system justification perspective

Copyright © 2023 The Authors. This study investigates how the system justification motive manifests in employees’ voice/silence behavior at the workplace. It also explores the moderating effects of system justification on the linkage between abusive supervision and voice/silence behavior for blue- and white-collar employees. The field study generated responses from 905 employees in Turkey. Multi-group analysis reveals that the moderating effect of system justification motives varies by occupational class. In particular, the impact of abusive supervision on silence becomes more salient when white-collar employees endorse higher system justification motives. However, in the blue-collar sample, the absence of a moderating effect could be attributed to the strong main effect of system justification motives. The current study adds to the extant literature by applying a system justification perspective to voice and silence behavior by collar differences at work. It also provides important implications for managers in dealing with workplace mistreatment affecting all occupational groups, mainly when blue-collar employee silence is endemic and regulatory policies are inadequate

Prevalence of Frailty in European Emergency Departments (FEED): an international flash mob study

Introduction Current emergency care systems are not optimized to respond to multiple and complex problems associated with frailty. Services may require reconfiguration to effectively deliver comprehensive frailty care, yet its prevalence and variation are poorly understood. This study primarily determined the prevalence of frailty among older people attending emergency care. Methods This cross-sectional study used a flash mob approach to collect observational European emergency care data over a 24-h period (04 July 2023). Sites were identified through the European Task Force for Geriatric Emergency Medicine collaboration and social media. Data were collected for all individuals aged 65 + who attended emergency care, and for all adults aged 18 + at a subset of sites. Variables included demographics, Clinical Frailty Scale (CFS), vital signs, and disposition. European and national frailty prevalence was determined with proportions with each CFS level and with dichotomized CFS 5 + (mild or more severe frailty). Results Sixty-two sites in fourteen European countries recruited five thousand seven hundred eighty-five individuals. 40% of 3479 older people had at least mild frailty, with countries ranging from 26 to 51%. They had median age 77 (IQR, 13) years and 53% were female. Across 22 sites observing all adult attenders, older people living with frailty comprised 14%. Conclusion 40% of older people using European emergency care had CFS 5 + . Frailty prevalence varied widely among European care systems. These differences likely reflected entrance selection and provide windows of opportunity for system configuration and workforce planning

Cadaveric study of the arterial anatomy of the upper lip

Arterial distribution of the upper lip was investigated in this study. The location, course, length, and diameter of the superior labial artery and its alar and septal branches were determined on 14 preserved cadaver heads. Another cadaver head was used to show the arterial tree by the colored silicone injection technique. The superior labial artery was the main artery of the upper lip and always originated from the facial artery. The superior labial artery was 45.4 mm in length, with a range from 29 to 85 mm. The mean distance of the origin of the superior labial artery from the labial commissura was 12.1 mm. The superior labial artery was 1.3 turn in external diameter at its origin. The mean distance of origin of the superior labial artery from the lower border of the mandible was 46.4 mm. The alar division of the superior labial artery was mostly found as a single branch (82 percent). Its mean length was 14.8 mm and the mean diameter at the origin was 0.5 mm. The distance between the origins of the superior labial artery and the septal branch was 33.3 mm. The septal branch was single in most of the cases (90 percent). The mean length of the septal branch was 18.0 mm and the diameter at its origin was 0.9 mm. After all dissections, it was concluded that the arterial distribution of the upper lip was not constant. The superior labial artery can occur in different locations unilaterally and bilaterally, with the branches showing variability

The processing of Mg-Ti for hydrogen storage; mechanical milling and plasma synthesis

A study was carried out into the processing of Mg-10 vol.% Ti powder mixture for hydrogen storage purposes. Two processing routes were evaluated; mechanical milling and plasma synthesis. Mechanical milling, carried out with a high speed planetary mill, yielded a particulate structure made up of large Mg agglomerates, 90-100 mu m, with embedded Ti fragments of approx. 1 mu m in size with a uniform distribution. Mg agglomerates were made up of coherently diffracting volumes that were less than SO nm in size. Plasma processing was carried out with an RF plasma torch of 25-27 kW applied power, the powder mixtures fed with 1-3 g/min axially into the torch. The mixture Mg-10 vol.% Ti after plasma processing comprised Mg powders which were extremely fine, <100 nm. Ti occurred as separate particles mixed with Mg nanopowders. The powders had a coherently diffracting volumes that were comparable to the size of the particles themselves indicating that the plasma processing yields relatively defect free crystals. The formation of the nano-size particulate structures is evaluated with regard to their possible implications on the hydrogenation of Mg-Ti alloys. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved

Arterial anatomy of the lower lip: A Cadaveric Study

The aim of the study was to investigate the arterial anatomy of the lower lip. The location, course, length, and diameter of the inferior labial artery and the sublabial artery were revealed by bilateral meticulous anatomic dissections in 14 adult male preserved cadaver heads. Another cadaver head was used for silicone rubber injection to fill the regional arterial tree. The inferior labial artery was the main artery of the lower lip and in all cases branched off the facial artery. The mean length of the inferior labial artery was found to be 52.3 mm (range, 16 to 98 mm). The mean distance of the origin of the inferior labial artery from the labial commissura was 23.9 mm. The mean external diameter of the inferior labial artery at the origin was 1.2 mm. The sublabial artery was present in 10 (71 percent) of the cadavers. Mean measurements of this artery were I mm for diameter, 23.4 mm for length, and 27.6 mm for distance from the labial commissura. The sublabial artery may originate from the facial artery or the inferior labial artery. This study found that this region does not have a constant arterial distribution, the inferior labial artery and the sublabial artery (if it exists) can be in different locations unilaterally or bilaterally, and the diameter and the length may vary