keyword
https://read.qxmd.com/read/38408101/underwater-image-enhancement-using-multi-task-fusion
#21
JOURNAL ARTICLE
Kaibo Liao, Xi Peng
Underwater images are often scattered due to suspended particles in the water, resulting in light scattering and blocking and reduced visibility and contrast. Color shifts and distortions are also caused by the absorption of different wavelengths of light in the water. This series of problems will make the underwater image quality greatly impaired, resulting in some advanced visual work can not be carried out underwater. In order to solve these problems, this paper proposes an underwater image enhancement method based on multi-task fusion, called MTF...
2024: PloS One
https://read.qxmd.com/read/38393262/foot-placement-in-the-basic-position-on-the-start-block-osb12-of-young-competitive-swimmers
#22
JOURNAL ARTICLE
Ivan Matúš, Bibiana Vadašová, Tomáš Eliaš, Łukasz Rydzik, Tadeusz Ambroży, Wojciech Czarny
BACKGROUND: The basic position on the starting block can influence the performance at the start, as it is the initial phase on which the other phases depend, as well as the swimming performance in sprint events in all swimming styles. The aim of our study is to analyze the effect of the foot in the base position on the block start on performance in the 5 m distance start. MATERIAL AND METHODS: Fifteen performance swimmers aged 17 ± 2 years were tested in their preferred wide and narrow starting positions, performing a total of six starts during which angular, temporal, and length changes were monitored in block, flight, and underwater phases...
January 29, 2024: Sports
https://read.qxmd.com/read/38392494/exploring-the-role-of-determinants-affecting-responsible-underwater-behaviour-of-marine-based-tourists
#23
JOURNAL ARTICLE
Ke Zhang, Lewis T O Cheung, Theresa W L Lam, Anson T H Ma, Lincoln Fok
This study utilised divers' demographic characteristics, diving experience, and attitudes to analyse the association between these factors and divers' responsible underwater behaviour among Chinese scuba divers in Hong Kong. More innovatively, the measurement construct of diving attitude was further employed as a mediator to investigate its influence on the relationship between divers' diving experience and responsible underwater behaviours based on the conceptual framework of previous works in the literature...
February 16, 2024: Behavioral Sciences
https://read.qxmd.com/read/38381755/rhythmic-properties-of-sciaena-umbra-calls-across-space-and-time-in-the-mediterranean-sea
#24
JOURNAL ARTICLE
Marta Picciulin, Marta Bolgan, Lara S Burchardt
In animals, the rhythmical properties of calls are known to be shaped by physical constraints and the necessity of conveying information. As a consequence, investigating rhythmical properties in relation to different environmental conditions can help to shed light on the relationship between environment and species behavior from an evolutionary perspective. Sciaena umbra (fam. Sciaenidae) male fish emit reproductive calls characterized by a simple isochronous, i.e., metronome-like rhythm (the so-called R-pattern)...
2024: PloS One
https://read.qxmd.com/read/38304190/a-fish-can-change-its-stripes-investigating-the-role-of-body-colour-and-pattern-in-the-bluelined-goatfish
#25
JOURNAL ARTICLE
Louise Tosetto, Nathan S Hart, Jane E Williamson
Bluelined goatfish ( Upeneichthys lineatus ) rapidly change their body colour from a white horizontally banded pattern to a seemingly more conspicuous vertically banded red pattern, often when foraging. Given the apparent conspicuousness of the pattern to a range of observers, it seems unlikely that this colour change is used for camouflage and instead may be used for communication/signalling. Goatfish often drive multispecies associations, and it is possible that goatfish use this colour change as a foraging success signal to facilitate cooperation, increase food acquisition, and reduce predation risk through a 'safety in numbers' strategy...
2024: PeerJ
https://read.qxmd.com/read/38166043/kinematic-analysis-of-the-underwater-glide-phase-during-the-push-off-in-competitive-swimmers
#26
JOURNAL ARTICLE
Alfonso Trinidad
The aim of the study was to analyze the kinematic parameters of the push-off start during the underwater glide in competitive swimmers. 74 swimmers participating in the Spanish Championships were filmed and analyzed by DLT-2D photogrammetry after the push-off start in crawl, backstroke and butterfly. Between genders there were differences in distance and speed. Male swimmers covered greater distances (1.37±0.06 vs 1.20±0.05 m, η2 = 0.02, F = 3.85, p = 0.05) and were faster (2.36±0.03 and 2...
2024: PloS One
https://read.qxmd.com/read/38165990/spatial-diversity-processing-mechanism-based-on-the-distributed-underwater-acoustic-communication-system
#27
JOURNAL ARTICLE
Manli Zhou, Hao Zhang, Tingting Lv, Yong Gao, Yingying Duan
To address the problem of unreliable single-link underwater acoustic communication caused by large signal delays and strong multipath effects in shallow water environments, this paper proposes a distributed underwater acoustic diversity communication system (DUA-DCS). DUA-DCS employs a maneuverable distributed cross-medium buoy network to form multiple distributed, non-coherent, and parallel communication links. In the uplink, a receiving diversity processing mechanism of joint decision feedback equalizer embedded phase-locked loop and maximum signal-to-interference ratio combining (DFE-PLL-MSIRC) is proposed to achieve waveform-level diversity combining of underwater signals...
2024: PloS One
https://read.qxmd.com/read/38115017/teaching-point-of-care-ultrasound-using-a-serious-game-a-randomized-controlled-trial
#28
RANDOMIZED CONTROLLED TRIAL
Tycho Olgers, Jelle Rozendaal, Sanne van Weringh, Rachel van de Vliert, Ranek Laros, Hjalmar Bouma, Jan Ter Maaten
BACKGROUND: Point-of-care ultrasound (POCUS) is an important diagnostic tool for internists. However, there are important barriers in learning POCUS, including lack of practice time and lack of experts for supervision. Alternative learning tools may assist in overcoming these barriers. A serious game is being developed specifically for teaching ultrasound. In this study, we assessed the use of a serious game in learning POCUS. METHODS: Ultrasound-native medical students were randomly assigned to the intervention group (N = 27) or the control group (N = 26)...
December 19, 2023: BMC Medical Education
https://read.qxmd.com/read/38111247/results-of-acute-cerebral-infarction-treatment-with-hyperbaric-oxygen-therapy-2020-2022
#29
JOURNAL ARTICLE
Nam Bao Nguyen, Ha Hai Nguyen Thi, Hong Le Thi, Son Truong Nguyen, Tam Van Nguyen
BACKGROUND: Cerebral stroke is the third leading cause of death after cardiovascular disease, cancer and the leading cause of disability for patients. Hyperbaric oxygen is a non-drug treatment that has the potential to improve brain function for patients with ischaemic stroke. The objective of this study was to evaluate the results of treatment of acute cerebral infarction with hyperbaric oxygen therapy (HBOT). MATERIALS AND METHODS: This was a case-control study...
2023: International Maritime Health
https://read.qxmd.com/read/38092370/a-european-code-of-good-practice-for-hyperbaric-oxygen-therapy-review-2022
#30
JOURNAL ARTICLE
Jacek Kot, Jordi Desola, Folke Lind, Peter Mueller, Erik Jansen, Francois Burman, - Working Group
No abstract text is available yet for this article.
December 20, 2023: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://read.qxmd.com/read/38091597/hypoxic-loss-of-consciousness-in-air-diving-two-cases-of-mixtures-made-hypoxic-by-oxidation-of-the-scuba-diving-cylinder
#31
Arnaud Druelle, Lucille Daubresse, Jean U Mullot, Hélène Streit, Pierre Louge
Without an adequate supply of oxygen from the scuba apparatus, humans would not be able to dive. The air normally contained in a scuba tank is dry and free of toxic gases. The presence of liquid in the tank can cause corrosion and change the composition of the gas mixture. Various chemical reactions consume oxygen, making the mixture hypoxic. We report two cases of internal corrosion of a scuba cylinder rendering the respired gas profoundly hypoxic and causing immediate hypoxic loss of consciousness in divers...
December 20, 2023: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://read.qxmd.com/read/38091596/hyperbaric-oxygen-treatment-in-delayed-post-hypoxic-encephalopathy-following-inhalation-of-liquefied-petroleum-gas-a-case-report
#32
Kubra Canarslan Demir, Burak Turgut, Kubra Ozgok Kangal, Taylan Zaman, Kemal Şimşek
Delayed post-hypoxic encephalopathy can occur after an episode of anoxia or hypoxia. Symptoms include apathy, confusion, and neurological deficits. We describe a 47-year-old male patient who inhaled gas from a kitchen stove liquid petroleum gas cylinder. He was diagnosed with hypoxic ischaemic encephalopathy 12 hours after his emergency department admission. He received six sessions of hyperbaric oxygen treatment (HBOT) and was discharged in a healthy state after six days. Fifteen days later, he experienced weakness, loss of appetite, forgetfulness, depression, balance problems, and inability to perform self-care...
December 20, 2023: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://read.qxmd.com/read/38091595/cerebral-arterial-gas-embolism-cage-during-open-water-scuba-certification-training-whilst-practising-a-controlled-emergency-swimming-ascent
#33
Neil Banham, Elisabete da Silva, John Lippmann
We report the case of a 23-year-old male novice diver who sustained cerebral arterial gas embolism (CAGE) during his open water certification training whilst practising a free ascent as part of the course. He developed immediate but transient neurological symptoms that had resolved on arrival to hospital. Radiological imaging of his chest showed small bilateral pneumothoraces, pneumopericardium and pneumomediastinum. In view of this he was treated with high flow normobaric oxygen rather than recompression, because of the risk of development of tension pneumothorax upon chamber decompression...
December 20, 2023: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://read.qxmd.com/read/38091594/pulmonary-oxygen-toxicity-breath-markers-after-heliox-diving-to-81-metres
#34
JOURNAL ARTICLE
Feiko Jm de Jong, Paul Brinkman, Thijs T Wingelaar, Pieter-Jan Am van Ooij, Robert A van Hulst
Pulmonary oxygen toxicity (POT), an adverse reaction to an elevated partial pressure of oxygen in the lungs, can develop as a result of prolonged hyperbaric hyperoxic conditions. Initially starting with tracheal discomfort, it results in pulmonary symptoms and ultimately lung fibrosis. Previous studies identified several volatile organic compounds (VOCs) in exhaled breath indicative of POT after various wet and dry hyperbaric hypoxic exposures, predominantly in laboratory settings. This study examined VOCs after exposures to 81 metres of seawater by three navy divers during operational heliox diving...
December 20, 2023: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://read.qxmd.com/read/38091593/within-diver-variability-in-venous-gas-emboli-vge-following-repeated-dives
#35
JOURNAL ARTICLE
David J Doolette, F Gregory Murphy
INTRODUCTION: Venous gas emboli (VGE) are widely used as a surrogate endpoint instead of decompression sickness (DCS) in studies of decompression procedures. Peak post-dive VGE grades vary widely following repeated identical dives but little is known about how much of the variability in VGE grades is proportioned between-diver and within-diver. METHODS: A retrospective analysis of 834 man-dives on six dive profiles with post-dive VGE measurements was conducted under controlled laboratory conditions...
December 20, 2023: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://read.qxmd.com/read/38091592/comparing-the-emma-capnograph-with-sidestream-capnography-and-arterial-carbon-dioxide-pressure-at-284-kpa
#36
JOURNAL ARTICLE
Xavier Ce Vrijdag, Hanna van Waart, Chris Sames, Jamie W Sleigh, Simon J Mitchell
INTRODUCTION: Capnography aids assessment of the adequacy of mechanical patient ventilation. Physical and physiological changes in hyperbaric environments create ventilation challenges which make end-tidal carbon dioxide (ETCO2 ) measurement particularly important. However, obtaining accurate capnography in hyperbaric environments is widely considered difficult. This study investigated the EMMA capnograph for hyperbaric use. METHODS: We compared the EMMA capnograph to sidestream capnography and the gold standard arterial carbon dioxide blood gas analysis in a hyperbaric chamber...
December 20, 2023: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://read.qxmd.com/read/38091591/measuring-whole-body-inert-gas-wash-out
#37
JOURNAL ARTICLE
Oscar Plogmark, Mårten Silvanius, Max Olsson, Carl Hjelte, Magnus Ekström, Oskar Frånberg
INTRODUCTION: Quantifying inert gas wash-out is crucial to understanding the pathophysiology of decompression sickness. In this study, we developed a portable closed-circuit device for measuring inert gas wash-out and validated its precision and accuracy both with and without human subjects. METHODS: We developed an exhalate monitor with sensors for volume, temperature, water vapor and oxygen. Inert gas volume was extrapolated from these inputs using the ideal gas law...
December 20, 2023: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://read.qxmd.com/read/38091590/full-face-snorkel-masks-increase-the-incidence-of-hypoxaemia-and-hypercapnia-during-simulated-snorkelling-compared-to-conventional-snorkels
#38
JOURNAL ARTICLE
Janneke Grundemann, Xavier Ce Vrijdag, Nicole Ye Wong, Nicholas Gant, Simon J Mitchell, Hanna van Waart
INTRODUCTION: Air flow in full-face snorkel masks (FFSMs) should be unidirectional to prevent rebreathing of exhaled air. This study evaluated rebreathing and its consequences when using FFSMs compared to a conventional snorkel. METHODS: In a dry environment 20 participants wore three types of snorkel equipment in random order: Subea Easybreath FFSM; QingSong 180-degree panoramic FFSM; and a Beuchat Spy conventional snorkel (with nose clip), in three conditions: rest in a chair; light; and moderate intensity exercise on a cycle ergometer...
December 20, 2023: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://read.qxmd.com/read/38091589/rapture-of-the-deep-gas-narcosis-may-impair-decision-making-in-scuba-divers
#39
JOURNAL ARTICLE
Pauliina A Ahti, Jan Wikgren
INTRODUCTION: While gas narcosis is familiar to most divers conducting deep (> 30 metres) dives, its effects are often considered minuscule or subtle at 30 metres. However, previous studies have shown that narcosis may affect divers at depths usually considered safe from its influence, but little knowledge exists on the effects of gas narcosis on higher cognitive functions such as decision-making in relatively shallow water at 30 metres. Impaired decision-making could be a significant safety issue for a multitasking diver...
December 20, 2023: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://read.qxmd.com/read/38091588/risk-assessment-of-swen21-a-suggested-new-dive-table-for-the-swedish-armed-forces-bubble-grades-by-ultrasonography
#40
JOURNAL ARTICLE
Carl Hjelte, Oscar Plogmark, Mårten Silvanius, Magnus Ekström, Oskar Frånberg
INTRODUCTION: To develop the diving capacity in the Swedish armed forces the current air decompression tables are under revision. A new decompression table named SWEN21 has been created to have a projected risk level of 1% for decompression sickness (DCS) at the no stop limits. The aim of this study was to evaluate the safety of SWEN21 through the measurement of venous gas emboli (VGE) in a dive series. METHODS: A total 154 dives were conducted by 47 divers in a hyperbaric wet chamber...
December 20, 2023: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
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