scholarly journals Preliminary Study on Beam-To-Column Joints Under Impact Loading

2018 ◽  
Vol 12 (1) ◽  
pp. 112-123 ◽  
Author(s):  
Marina D’Antimo ◽  
Massimo Latour ◽  
Gianvittorio Rizzano ◽  
Jean-François Demonceau ◽  
Jean-Pierre Jaspart
Keyword(s):  
Impact Loading ◽  
Human Error ◽  
Image Correlation ◽  
Experimental Campaign ◽  
Preliminary Study ◽  
European Projects ◽  
The University ◽  
Steel Joints ◽  
Globally Stable ◽  
Robustness Assessment

Background:Recent catastrophic events have pointed out the need to ensure the integrity of structures under “exceptional” events. Since many years, the University of Liège is involved in different activities and projects related to the robustness assessment of structures. The robustness of a structure is the ability of the system to remain globally stable after events not directly accounted for in the design, like impact, fire or consequences of a human error, which should lead to a reasonable damage when compared to the original cause.Objective:The presented preliminary work reports the experimental campaign of different European projects (FREEDAM and ROBUSTIMPACT) carried out or currently ongoing, with the aim of understanding the behaviour of different joint typologies under impact loading protocol.Method:The experimental programmes have mainly regarded static and impact tests on steel joints by the means of a dropping mass using DIC (Digital Image Correlation) for the data acquisition.Conclusions:In the present paper, an overview on the design criteria adopted in the design of the experimental campaign, for the FREEDAM project, is given, and some earliest results are discussed.

Numerical Simulation on Concrete Median Barrier for Reducing Concrete Fragment Under Harsh Impact Loading of a 25-ton Truck

2017 ◽  
Vol 139 (2) ◽  
Author(s):  
Jaeha Lee ◽  
Goangseup Zi ◽  
Ilkeun Lee ◽  
Yoseok Jeong ◽  
Kyeongjin Kim ◽  
...  
Keyword(s):  
Impact Loading ◽  
Traffic Accident ◽  
Impact Analysis ◽  
Threshold Value ◽  
Rigid Wall ◽  
Wire Mesh ◽  
Element Size ◽  
Preliminary Study ◽  
The Impact ◽  
Controlling Behaviors

Recently, there was a collision accident involving vehicle–concrete median barrier in South Korea, and unfortunately, passengers on the opposite direction road were killed by the flying broken pieces of concrete generated by the collision. Primarily after this accident, we felt the need for developing an improved concrete median barrier up to level of SB6 impact severity in order to minimize the amount of broken pieces of concrete and any possibility of traffic accident casualty under the impact loading of truck. Accordingly, in this study, several designs of concrete median barriers have been examined, and a preliminary study has been conducted for developing and verifying appropriate collision model. First, type of vehicle was selected based on impact analysis on rigid wall. Then, the effects of element size and other key parameters on the capacity of the concrete median barrier under impact were studied. It was found that the key parameters for controlling behaviors of the median barrier under impact loading were contact option, threshold value, and mesh and boundary conditions. Furthermore, as a parametric study, effect of geometry and amount of wire-mesh or steel rebar in concrete median barrier on impact resistances of median barrier for reducing the collision debris were investigated. The amount of volume loss after the collision of truck was compared for various reinforcement ratios.

scholarly journals Salt intake and blood pressure in the university of Asuncion-Paraguay youths: a preliminary study

2012 ◽  
Vol 34 (4) ◽  
pp. 361-368 ◽  
Author(s):  
Tania Campagnoli ◽  
Lorena Gonzalez ◽  
Francisco Santa Cruz
Keyword(s):  
Blood Pressure ◽  
Salt Intake ◽  
Preliminary Study ◽  
The University

scholarly journals Correlation Between Dysphagia and Malocclusion in Rett Syndrome: A preliminary study

2019 ◽  
Vol 18 (4) ◽  
pp. 489
Author(s):  
Serena Cocca ◽  
Massimo Viviano ◽  
Michele Loglisci ◽  
Stefano Parrini ◽  
Giovanni Monciatti ◽  
...  
Keyword(s):  
Rett Syndrome ◽  
Epileptic Seizures ◽  
University Hospital ◽  
Severe Dysphagia ◽  
Feeding And Eating Disorders ◽  
Craniofacial Dysmorphism ◽  
The Mean ◽  
Preliminary Study ◽  
The University ◽  
Mild Dysphagia

Objectives: Rett syndrome (RS) is a severe neurological developmental disorder characterised by stereotypical hand movements, epileptic seizures, craniofacial dysmorphism and digestive dysfunction. This study aimed to examine the correlation between the severity of malocclusion and dysphagia in patients with RS. Methods: This preliminary study was conducted at the Ear, Nose & Throat Clinic of the University Hospital of Siena, Siena, Italy, from January 2014 to December 2017. A total of 56 patients with RS were examined and grouped according to the severity of dysphagia (absent, mild, moderate or severe) and malocclusion (<2 mm, 2–3 mm, 3–4 mm or >4 mm). Results: All of the patients were female and the mean age was 11.3 years. Eight (14.3%) patients had mild, 18 (32.1%) had moderate and 30 (53.6%) had severe dysphagia. Four (7.1%) patients had <2 mm occlusion, 10 (17.9%) had 2–3 mm occlusion, 26 (46.4%) had 3–4 mm occlusion and 16 (28.6%) had >4 mm occlusion. Mild dysphagia was observed in 100% and 40% of patients with <2 and 2–3 mm malocclusion, respectively, while moderate dysphagia was present in 60% and 38.5% of patients with 2–3 and 3–4 mm malocclusion, respectively. Severe dysphagia was observed in 28.6% and 87.5% of patients with 3–4 and >4 mm malocclusion, respectively. There was a significant correlation between dysphagia and malocclusion severity (P <0.001). Conclusion: A higher degree of malocclusion was associated with more severe dysphagia among a cohort of patients with RS.Keywords: X-Linked Mental Retardation; Rett Syndrome; Dysphagia; Malocclusion; Feeding and Eating Disorders of Childhood.

PRELIMINARY STUDY OF RIVER WATER IN GOLD MINING AREAS OF CAMBODIA

2004 ◽  
Vol 14 (03n04) ◽  
pp. 109-114
Author(s):  
SATOSHI MURAO ◽  
FUMITAKA NISHIYAMA ◽  
SOTHAM SIENG
Keyword(s):  
Gold Mining ◽  
Mineral Resources ◽  
Computer Code ◽  
External Beam ◽  
Social Concern ◽  
Mining Site ◽  
Mining Sites ◽  
Mining Areas ◽  
Preliminary Study ◽  
The University

In Cambodia, artisanal mining has recently come to a social concern because of the possibility to cause environmental degradation and human health problems. The General Department of Mineral Resources of Cambodia is collecting environmental specimens in mining sites to watch the situation. This time, four water samples from Sampov Loon and one from Memong mining site were sent from the Department to Hiroshima University, Japan, and the samples were analyzed by means of PIXE at the University. A volume of 10 μl from each sample was separated and dropped onto 4 μm polypropylene backing foil. The measurement was carried out by using 2.5 MV single-ended Van de Graaff accelerator. A Si(Li) detector (active area, 80mm2; sensitive depth, 5mm; Be -window's thickness, 25 μm; resolution, 167 eV fwhm at 5.9 keV) was used for both of in vacuo PIXE and non-vacuum external beam PIXE measurement. A computer code PIXS was used for the quantification. The result indicates that there are at least two kinds of water in Sampov Loon and one of them possibly represents polluted condition.

Performance Characterization of Multifunctional Wings With Integrated Solar Cells for Unmanned Air Vehicles

2014 ◽  
Author(s):  
Ariel Perez-Rosado ◽  
Adrian G. J. Griesinger ◽  
Hugh A. Bruck ◽  
Satyandra K. Gupta
Keyword(s):  
Solar Cells ◽  
Flapping Wing ◽  
Image Correlation ◽  
Unmanned Air Vehicles ◽  
University Of Maryland ◽  
Battery Power ◽  
Cell Test ◽  
The University ◽  
Air Vehicles

Flapping wing unmanned air vehicles (UAVs) are small light weight vehicles that typically have short flight times due to the small size of the batteries that are used to power them. During longer missions, the batteries must be recharged. The lack of nearby electrical outlets severely limits the locations and types of missions that these UAVs can be flown in. To improve flight time and eliminate the need for electrical outlets, solar cells can be used to harvest energy and charge/power the UAV. Robo Raven III, a flapping wing UAV, was developed at the University of Maryland and consists of wings with integrated solar cells. This paper aims to investigate how the addition of solar cells affects the UAV. The changes in performance are quantified and compared using a load cell test as well as Digital Image Correlation (DIC). The UAV platform reported in this paper was the first flapping wing robotic bird that flew using energy harvested from on-board solar cells. Experimentally, the power from the solar cells was used to augment battery power and increase operational time.

scholarly journals Laparoscopic Appendectomy in Children: Preliminary Study in Pediatric Hospital Albert Royer, Dakar

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Mbaye Fall ◽  
Doudou Gueye ◽  
Ibrahima Bocar Wellé ◽  
Faty Balla Lo ◽  
Aloise Sagna ◽  
...  
Keyword(s):  
Acute Appendicitis ◽  
Complicated Appendicitis ◽  
University Hospital ◽  
Male Predominance ◽  
Average Production ◽  
Radiological Data ◽  
The Mean ◽  
Preliminary Study ◽  
The University ◽  
Douglas Pouch

Appendiceal pathology’s management has benefited in recent years from the advent of laparoscopic surgery. This study is to make a preliminary assessment of laparoscopic management of acute and complicated appendicitis in children after a few months of practice at the University Hospital Albert Royer, Dakar. This is a retrospective study of 22 cases of patients, all operated on by the same surgeon. The parameters studied were age, sex, clinical data and laboratory features, radiological data, and results of surgical treatment. The mean age of patients was 9.5 years with a male predominance. The series includes 14 cases of acute appendicitis and 8 complicated cases. Appendectomy anterograde is practiced in 81% of cases. Appendectomy was associated with peritoneal wash in 17 patients including 9 cases of acute appendicitis. Drainage of Douglas pouch is performed in 2 patients with complicated appendicitis; the average production was 300 cc of turbid liquids and any complications were not founded. An abscess of Douglas pouch is noted in 2 patients with complicated appendicitis undrained. These Douglas abscesses were treated medically. No conversion of laparotomy was performed in the series. After an average of 8 months no other problems were noted.

Cross-Cultural Differences in Female University Students' Attitudes toward Homosexuals: A Preliminary Study

2003 ◽  
Vol 92 (2) ◽  
pp. 565-572 ◽  
Author(s):  
Sherry A. Span ◽  
Lourdes A. Vidal
Keyword(s):  
Cultural Differences ◽  
Gay Men ◽  
Hispanic Students ◽  
Cross Cultural ◽  
Asian Students ◽  
Cross Cultural Differences ◽  
Caucasian Students ◽  
Preliminary Study ◽  
Students Attitudes ◽  
The University

62 Caucasian, 61 Hispanic, and 44 Asian female undergraduates completed the Index of Homophobia by Hudson and Ricketts, seven items from the Attitudes Toward Lesbians and Gay Men Scale by Herek, and three questions on Affectional Orientation toward homosexuals from D'Augelli and Rose. Overall, familiarity with homosexuals as measured by self-reported number of homosexual friends correlated negatively with scores on the homophobia measures, but there were no significant differences among the groups' reported number of homosexual friends. Asian students scored signiftcantly higher on the homophobia measures than Caucasian students. Both Asian and Hispanic students endorsed the statement significantly more often than Caucasian students that the university would be better if only heterosexuals attended. No significant differences in scores were found regarding attitudes toward lesbians versus gay men.

scholarly journals Feasibility of detecting orthopaedic screw overtightening using acoustic emission

2017 ◽  
Vol 231 (3) ◽  
pp. 213-221 ◽  
Author(s):  
Rhys Pullin ◽  
Bryan J Wright ◽  
Richard Kapur ◽  
John P McCrory ◽  
Matthew Pearson ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Human Error ◽  
Current Practice ◽  
State Of The Art ◽  
Screw Fixation ◽  
Measuring Devices ◽  
Current State ◽  
Emission Activity ◽  
Hip Screw ◽  
Preliminary Study

A preliminary study of acoustic emission during orthopaedic screw fixation was performed using polyurethane foam as the bone-simulating material. Three sets of screws, a dynamic hip screw, a small fragment screw and a large fragment screw, were investigated, monitoring acoustic-emission activity during the screw tightening. In some specimens, screws were deliberately overtightened in order to investigate the feasibility of detecting the stripping torque in advance. One set of data was supported by load cell measurements to directly measure the axial load through the screw. Data showed that acoustic emission can give good indications of impending screw stripping; such indications are not available to the surgeon at the current state of the art using traditional torque measuring devices, and current practice relies on the surgeon’s experience alone. The results suggest that acoustic emission may have the potential to prevent screw overtightening and bone tissue damage, eliminating one of the commonest sources of human error in such scenarios.

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