Academic literature on the topic 'Diving chambers'
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Journal articles on the topic "Diving chambers"
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Clarke, Richard. "Monoplace chamber treatment of decompression illness: Review and commentary." Diving and Hyperbaric Medicine Journal 50, no. 3 (September 30, 2020): 264–72. http://dx.doi.org/10.28920/dhm50.3.264-272.
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This paper summarises the history and capabilities of monoplace chambers in treatment of decompression illness (DCI); both in support of diving operations and in the hospital setting. In the field, monoplace hyperbaric chambers provide victims of DCI immediate access to recompression in settings where traditional multiplace chambers are not available. Alternatively, they may facilitate pressurised transport to a multiplace chamber for continued management. Recently, collapsible lightweight versions have improved suitability for field deployment aboard small vessels in remote settings, and for use by less technically capable military, occupational and civilian operators. The resulting elimination of treatment delays may prove lifesaving and central nervous system sparing, and avoid subsequent diving fitness disqualification. Monoplace chambers thus facilitate diving operations that would otherwise be difficult to condone on health and safety grounds. The 1960s saw the introduction of multiplace hyperbaric chambers into the hospital setting, as a number of non-diving conditions appeared to benefit from hyperbaric oxygen. This coincided with interest in hyperbaric oxygen as a solid tumour radiation sensitiser. Development of a novel acrylic-hulled single occupancy chamber enabled patients to undergo radiotherapy while pressurised within its oxygen atmosphere. Increasing numbers of health care facilities adopted this chamber type as a more economical, less complex alternative to the multiplace chamber. Incorporation of relevant biomedical technologies have allowed monoplace chambers to support increasingly complex patients in a safe, effective manner. Despite these advances, criticism of medical centre-based monoplace chamber treatment of DCI exists. This paper evaluates this controversy and presents relevant counter-arguments.
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Clarke, Richard. "Monoplace chamber treatment of decompression illness: Review and commentary." Diving and Hyperbaric Medicine Journal 50, no. 3 (September 30, 2020): 264–72. http://dx.doi.org/10.28920/dhm50.3.264-272.
Full textAbstract:
This paper summarises the history and capabilities of monoplace chambers in treatment of decompression illness (DCI); both in support of diving operations and in the hospital setting. In the field, monoplace hyperbaric chambers provide victims of DCI immediate access to recompression in settings where traditional multiplace chambers are not available. Alternatively, they may facilitate pressurised transport to a multiplace chamber for continued management. Recently, collapsible lightweight versions have improved suitability for field deployment aboard small vessels in remote settings, and for use by less technically capable military, occupational and civilian operators. The resulting elimination of treatment delays may prove lifesaving and central nervous system sparing, and avoid subsequent diving fitness disqualification. Monoplace chambers thus facilitate diving operations that would otherwise be difficult to condone on health and safety grounds. The 1960s saw the introduction of multiplace hyperbaric chambers into the hospital setting, as a number of non-diving conditions appeared to benefit from hyperbaric oxygen. This coincided with interest in hyperbaric oxygen as a solid tumour radiation sensitiser. Development of a novel acrylic-hulled single occupancy chamber enabled patients to undergo radiotherapy while pressurised within its oxygen atmosphere. Increasing numbers of health care facilities adopted this chamber type as a more economical, less complex alternative to the multiplace chamber. Incorporation of relevant biomedical technologies have allowed monoplace chambers to support increasingly complex patients in a safe, effective manner. Despite these advances, criticism of medical centre-based monoplace chamber treatment of DCI exists. This paper evaluates this controversy and presents relevant counter-arguments.
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Sokolov, G. M., A. V. Suvorov, and A. T. Logunov. "TOXICOLOGY OF GASEOUS ENVIRONMENT IN DECOMPRESSION CHAMBER." Marine Medicine 4, no. 3 (October 7, 2018): 83–94. http://dx.doi.org/10.22328/2413-5747-2018-4-3-83-94.
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The paper presents basic concepts of toxicological problems under human containment in a closed hermetic hyperbaric volume basing on the literature data and our own long-term scientific and practical experience aimed at diving and diving medicine, development and testing of the decompression chambers. The paper describes the following essentials of the problem: gaseous atmospheric composition in closed hermetic volumes, evolution of exogenous gases in human organism under lowering in the chamber, evolving hazardous gaseous substances (HGS) in the closed volume, design average daily rate of HGS evolving, effect of conditions on HGS evolving, their maximum permissible concentrations, methods of СО2 and HGS removal in the chambers, and regulatory requirements. It is shown that the most of the modern existing chambers do not meet the regulatory requirements that may result in negative effects on human health. The ways to except the cases of human intoxication in the decompression chambers and systems are offered in the paper.
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Dolatkowski, Augustyn, A. Szczeblewska, Lucjan Łaba, and Bogdan Łokucijewski. "The sugar level in divers’ blood in hyperbaric conditions." Polish Hyperbaric Research 59, no. 2 (June 1, 2017): 61–68. http://dx.doi.org/10.1515/phr-2017-0009.
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Abstract The authors examined 104 divers performing dives in water, 14 exposed to simulated conditions in decompression chambers and 11 control subjects. The average blood sugar reading before diving amounted to 100 mg% with readings of 101 mg% after diving, whereas in the control group these readings were 107 and 100 mg% respectively and in the group of simulated dives, 102 before and 106 mg% after the exposure. It was found that the diet applied ensured a sufficiently high level blood sugar level in the subjects to protect them against hypoglycaemia. Further research in decompression chambers is required.
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Zaman, Taylan, Abdusselam Celebi, Bengusu Mirasoglu, and Akin Savas Toklu. "The evaluation of in-chamber sound levels during hyperbaric oxygen applications: Results of 41 centres." Diving and Hyperbaric Medicine Journal 50, no. 3 (September 30, 2020): 244–49. http://dx.doi.org/10.28920/dhm50.3.244-249.
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Introduction: Noise has physical and psychological effects on humans. Recommended exposure limits are exceeded in many hospital settings; however, information about sound levels in hyperbaric oxygen treatment chambers is lacking. This study measured in-chamber sound levels during treatments in Turkish hyperbaric centres. Methods: Sound levels were measured using a sound level meter (decibel meter). All chambers were multiplace with similar dimensions and shapes. Eight measurements were performed in each of 41 chambers; three during compression, three during decompression, and two at treatment pressure, one during chamber ventilation (flushing) and one without ventilation. At each measurement a sound sample was collected for 25 seconds and A-weighted equivalent (LAeq) and C-weighted peak (LCpeak) levels were obtained. Recorded values were evaluated in relation to sound level limits in regulations. Results: The highest sound level measured in the study was 100.4 dB(A) at treatment pressure while ventilation was underway and the lowest was 40.5 dB(A) at treatment pressure without ventilation. Most centres had sound levels between 70 dB and 85 dB throughout the treatment. Ventilation caused significant augmentation of noise. Conclusions: The chambers were generally safe in terms of noise exposure. Nevertheless, hyperbaric chambers can be very noisy environments so could pose a risk for noise-related health problems. Therefore, they should be equipped with appropriate noise control systems. Silencers are effective in reducing noise in chambers. Thus far, hyperbaric noise research has focused on chambers used for commercial diving. To our knowledge, this is the first study to investigate noise in hospital-based chambers during medical treatments.
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T., Stanciu. "Control of metabolic gases in hyperbaric chambers." Scientific Bulletin of Naval Academy XXII, no. 2 (December 15, 2019): 61–68. http://dx.doi.org/10.21279/1454-864x-19-i2-007.
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Respiratory effort in hyperbaric conditions is increased, leading to an increase in the diver's respiratory flow, increased oxygen consumption, and consistent carbon dioxide production. The knowledge of these physical and physiological phenomena involved during the hyperbaric respiration was studied theoretically in collaboration with the "Ovidius" University of Constanta, Faculty of Medicine. They were verified by experimental determinations on groups of divers in the Diving Center hyperbaric complex.
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Bumai, O. K., G. S. Torshin, and S. V. Malinina. "Features of medical and sanitary provision of diving operations in the Arctic zone of the Russian Federation." Marine Medicine 8, no. 1 (April 11, 2022): 69–73. http://dx.doi.org/10.22328/2413-5747-2022-8-1-69-73.
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The purpose of the scientific article is to study and analyze the features of medical and sanitary provision of diving operations in the Arctic zone of the Russian Federation.Materials and methods. The application of theoretical and empirical research methods allowed analyzing the features of medical and sanitary provision of diving operations in the Arctic.Results and their discussion. Studies have shown that the peculiarities of medical and sanitary provision of diving operations in the Arctic zone of the Russian Federation are associated with the prevention and treatment of hypothermia and decompression sickness in divers, including the use of heated oxygen-helium mixtures for breathing. To solve this problem, evacuation of injured divers with the help of transportation pressure chambers and special mobile diving complexes are also used to provide qualified and specialized assistance in Arctic conditions.
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Yakhontov, B. O. "STRUCTURE AND FUNCTION OF LIFE SUPPORT SYSTEMS FOR DIVING HYPERBARIC CHAMBERS." International Journal of Applied and Fundamental Research (Международный журнал прикладных и фундаментальных исследований), no. 11 2018 (2018): 34–39. http://dx.doi.org/10.17513/mjpfi.12446.
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Yakhontov, B. O. "PRINCIPLES OF MEASURING BIOPHYSICAL PARAMETERS OF THE ENVIRONMENT IN DIVING PRESSURE CHAMBERS." International Journal of Applied and Fundamental Research (Международный журнал прикладных и фундаментальных исследований), no. 7 2020 (2020): 7–13. http://dx.doi.org/10.17513/mjpfi.13092.
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Manni, Corrado, and Sergio I. Magalini. "Mobile Hyperbaric Chambers for Early Treatment and Air Transportation in Diving Accidents." Journal of the World Association for Emergency and Disaster Medicine 1, no. 1 (1985): 73–75. http://dx.doi.org/10.1017/s1049023x00032817.
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The rescue of victims of accidents during underwater activities, and the treatment of the pathology provoked by too rapid ascent in diving, are unfortunately problems which still remain relevant today. The concept of rapid artificial recompression is at the basis of the fundamental therapeutic techniques for the early treatment of all those involved in accidents of this type. Though numerous advances have been achieved in this field, many practical limitations still prevent their complete utilization.
Dissertations / Theses on the topic "Diving chambers"
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Rosser, Damien Paul. "Analysis of VOCs in hyperbaric atmospheres." Thesis, University of Aberdeen, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274844.
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This purpose of this investigation was to develop a methods for the determination of trace level VOCs present in offshore hyperbaric diving environments using Thermal Desorption Gas Chromatography-Mass Spectrometry. As the hyperbaric chambers would usually be onboard a ship, the sampling and transportation of samples would be in cylinders rather than canisters or sorbent tubes. The sensitivity of the method had to be greater than methods for normobaric occupational exposure, as a chamber pressure was typically ten times normal atmospheric pressure and the divers were continuously exposed to all the VOCs present in the atmosphere. To reduce background contamination, cleaning procedures were put in place for both Tenax tubes and sampling cylinders. The performance of the Tenax tubes, the recovery from cylinders and GC-MS were investigated systematically using standards, CRM and environmental samples. This ensured that results determined were both qualitative and quantitative. The cylinder sampling experiments had shown that electropolished cylinders were quantitative for all types of trace VOC gas mixtures, while the Teflon lined and sand-blasted cyclinders showed reasonable recoveries for humid samples, like those of hyperbaric but low recoveries for dry gas mixtures. The VOC concentrations present in hyperbaric atmospheres were typically ten times those found in normobaric work environments, in the range of 50 - 300 mg/m3 for living chambers. Many compounds had been detected, including benzene, toluene, substituted aromatics, alkanes, chloroform, trichloroethylene and even compounds like pinene or limonene. In general all locations showed levels well below their HOELs or OELs. The method was also adapted to determine VOCs present in atmospheres by Tenax tube diffusive sampling. These experiments showed clearly that the method could be used for detection of VOCs in occupational environments and also urban air environments if required.
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Caviness, James A. "Stress biomarkers in a rat model of decompression sickness /." Download the thesis in PDF, 2005. http://www.lrc.usuhs.mil/dissertations/pdf/Caviness2005.pdf/.
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Macy, Dylan V. "Climate Translators: Broadcast New's Contribution to the Political Divide over Climate Change in the United States." Scholarship @ Claremont, 2020. https://scholarship.claremont.edu/pitzer_theses/94.
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In many instances, television news is the primary outlet through which people gain knowledge on climate change. Both the perceived threat of climate change and American news media have grown politically divided since the 1980s. I make the argument that American news media influences the partisan divide over climate change. In addition to the political landscape of news media, focus on political events and figures in climate coverage further contributes to a partisan divide. Supporting these claims are research displaying how climate change news is processed in a partisan manner and a selection of three case study periods in which climate change coverage spiked among MSNBC, CNN, and Fox News in the last twenty years (2000-2019). I collected news footage from all three case studies using the online database archive.org. Using this footage, an accompanying documentary short was produced that focused on the Paris Climate Accord Withdrawal in 2017. Presented in the documentary and the three case study periods, Fox News held a consistently hands-off and dismissive tone towards climate change, while MSNBC and CNN implemented climate science into coverage while advocating for collective climate action. I report that media is selected and processed via partisanship among viewers; these case studies illustrate the ways in which news media drives the political divide on climate change. I conclude by offering some future ways climate coverage can be more unifying, such as more emphasis on the economic benefits of “a green economy” in news coverage.
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Jennings, Julia M. "Comparison of cognitive and psychomotor performance across gender in hyperbaric and simulated hyperbaric conditions /." 2004.
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Les, Martin. "Vliv hyperbarického prostředí na jemnou motoriku." Master's thesis, 2017. http://www.nusl.cz/ntk/nusl-353285.
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Title: Effect of hyperbaric environment on fine motor skills Objectives: The aim of study is to assess the changes fine motor skills due to hyperbaric environment in preparation for selected tests of fine motor skills. Methods: The first method was used empirically - research. Then the method chosen of compilation of the information obtained. The basic method to work was the experimental measurement method specially constructed tests on fine motor skills. All measured values were statistically processed as follows. Results: The results were formulated as a percentage, graphs and tables. Recording was carried out by recording the time data. Their percentage of the overall approach to the exercise time mastering fine motor skills in different environments. All results obtained were processed and evaluated. Keywords: depth intoxication, fine motor skills, hyperbaric environment, hyperbaric chambers, diving
Books on the topic "Diving chambers"
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Lloyd's Register of Shipping (Firm : 1914- ). Rules and regulations for the construction and classification of submersibles and diving systems. London: Lloyd's Register of Shipping, 1987.
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Shipping, American Bureau of. Rules for building and classing underwater vehicles, systems, and hyperbaric facilities, 1990. Paramus, N.J., U.S.A. (P.O. Box 910, Paramus 07653-0910): American Bureau of Shipping, 1990.
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), Lloyd's Register of Shipping (Firm :. 1914. Rules and regulations for the construction and classification of submersibles and underwater systems. London: Lloyd's Register of Shipping, 1990.
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Cohen, Marc M. Space station human factors research review: Proceedings of a workshop held at Ames Research Center, Moffett Field, California, December 3-6, 1985. Moffett Field, Calif: Ames Research Center, 1988.
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Great Britain. Department of Energy. and Technica, eds. Diving chamber fire response times. London: HMSO, 1990.
Find full textBook chapters on the topic "Diving chambers"
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Perrone, Christian. "SDO-SuRS Deployable Assets Program." In Progress in Marine Science and Technology. IOS Press, 2022. http://dx.doi.org/10.3233/pmst220077.
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ITA Navy has started a new program for the acquisition of a Naval Vessel called SDO-SuRS (Special and Diving Operation – Submarine Rescue Ship). In order to fulfill operational requirements, IT Navy has recently procured the so-called “SDO-SuRS Deployable Assets”. A temporary business grouping (RTI) between SAIPEM Spa (leader in robotics and offshore) and DRASS Srl (national excellence in the hyperbaric sector and rescue) is the enterprise selected for the scope. This grouping represents a national excellence and a technological reference point for IT Navy in the Submarine Escape and Rescue. The new SDO-SuRS Deployable assets will have specific peculiarities such as: modularity, deployability, interoperability and complementarity. Modular assets will be either installable on board the national mother ship SDO-SuRS or rapidly deployable in scalable configurations (from rapid intervention to deep rescue) on a vessel of opportunity, military or commercial, for far-from-home operations. In order to establish a framework on damaged submarines rescue’s topic between Countries within ISMERLO (International Submarine Escape and Rescue Liaison Office) and NATO organizations, Italy offers the opportunity of providing any type of technical-administrative support in design, procurement, Life Management System or training of SAIPEM – DRASS systems, useful to a potential cooperation in the Submarine Escape and Rescue. On the whole the above mentioned Submarine Rescue packages consist of a several assets as follow: ∙ Submarine Rescue Vehicle (SRV) tethered type composed by a Rescue Chamber and a WROV (Working Class Remote Operated Vehicle) which will be managed both aboard the SDO-SuRS ship (Mother Ship) and aboard the Vessel of Opportunity. The system has to be designed/realized to perform the search and rescue of DISSUB as well as the transfer of crew inside the Diving Decompression Chamber. ∙ Portable Launch and Recovery System (PLARS) to permit the Launch/Recovery of SRV/SRC and WROV; ∙ Diving Decompression Chambers (DDC) with TUP (Transit Under Pressure) to face a specific sanitary treatment which could involve the submarine’s crew; ∙ Ventilation System (VS) by means of which will be possible the change of dirty air inside of the distressed submarine as well as the air insufflation to main ballast tanks; ∙ Submarine Rescue Chamber (SRC); ∙ Working Class Remote Operated Vehicle (WROV) able to perform underwater work and completely redundant with the WROV associated to SRV.
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Krishnamurti, Chandrasekhar. "Historical Aspects of Hyperbaric Physiology and Medicine." In Respiratory Physiology. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.85216.
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The history of hyperbaric oxygen therapy (HBOT) makes for fascinating reading. From pneumatic chambers and compressed air baths to empirical therapeutic applications during the nineteenth century, the impetus to scientific application of HBOT began in seeking solution for decompression sickness during various construction ventures. French physiologist Paul Bert’s research was pathbreaking and provided a scientific explanation on the etiology of the “bends.” In 1908, JS Haldane’s experiments recommended staged decompression and made diving safe. In 1921, OJ Cunningham employed HBOT to treat hypoxia secondary to lung infections successfully. It was cardiac surgeon Ite Boerema who put HBOT on a solid footing with his open-heart surgery results in various pediatric cardiac conditions and rightly deserved the title of father of modern-day hyperbaric medicine. From 1937 onwards, HBOT research snowballed into treating a wide variety of diseases. In 1999, the Undersea and Hyperbaric Medical Society and Food and Drug Administration recognized the value of HBOT, and this led to its becoming a major tool in the armamentarium of clinicians, either as a primary or adjunctive therapy for a spectrum of diseases.
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"The Surah of the Private Chambers." In The Divine Names, 475–76. New York University Press, 2023. http://dx.doi.org/10.18574/nyu/9781479826148.003.0037.
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Anderson, Paul. "Exchange Ideologies of Urban-Rural Difference." In Exchange Ideologies, 40–57. Cornell University Press, 2023. http://dx.doi.org/10.7591/cornell/9781501768279.003.0003.
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This chapter explores the concept of exchange ideologies while referencing differences between urban and rural people evident among merchants in Aleppo under Baathist rule. The regime's divide-and-rule policy maintained the bourgeoisies as competing elites in the city's markets and commercial chambers. The chapter explains how merchants deployed a mix of language and exchange ideologies to represent merchants and clans as different kinds of social beings. In comparison, the modes of commerce and speech of rural incomers were defined as uncouth. The chapter also expounds on the concept of urban identity which delegitimized social rivals and mobilized political support in elections to the Chamber of Commerce.
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Wright, Simon. "A Brazilian In Paris: The Synthesis (1923-1929)." In Villa-Lobos, 40–77. Oxford University PressNew York, NY, 1992. http://dx.doi.org/10.1093/oso/9780193154766.003.0003.
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Abstract Villa-Lobos’s Nonet is one of the most extraordinary pieces of chamber music ever written. Its scoring, founded on ideas from the Sexteto mistico and the Quarteto simb6lico, pushes the definition of ‘chamber’ to absurd limits: flute/piccolo, oboe, clarinet, saxophone, bassoon, celesta, harp, piano, a large percussion section using 18 instruments and requiring at least two players, and a mixed chorus dividing into, at most, 12 parts. All the disparate strands which lay together in the Canfiies tipicas were, in the Nonet, at last reconciled.
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"B1. Hyperbaric ignition and combustion behaviour for some selected diving chamber specific materials." In Management and Engineering of Fire Safety and Loss Prevention, 184–93. Routledge, 2006. http://dx.doi.org/10.4324/9780203975176-14.
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Kirby, Margaret Loewy. "Development of the Cardiac Pacemaking and Conduction System." In Cardiac Development, 161–78. Oxford University PressNew York, NY, 2007. http://dx.doi.org/10.1093/oso/9780195178197.003.0012.
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Abstract It is important that the tubular heart and the four-chambered heart beat in a coordinated fashion to propel blood from the inflow to the outflow. In a straight heart tube, because the myocardium is electrically coupled, the solution is relatively straightforward. But, coordinated contractions are necessarily different in a tube versus a four-chambered heart. Thus, development of the pacemaking and conduction system represents one of the most intriguing processes in heart development. Coordinated cardiac contractions are regulated by impulses that originate at the sinoatrial (SA) NODE, located at the junction of the superior vena cava and right atrium. Impulses generated at this node spread through the atrial chamber myocardium, to initiate contraction of the atria. The impulse is also spread to the atrioventricular (AV) NODE, located in the base of the atrial septum at the junction of the atria and ventricles, and is the only conducting route from the atria to the ventricles. The main function of the AV node is to slow the impulse from the atrial to the ventricular myocardium. Transmission of an impulse directly from the atrial myocardium to the ventricular myocardium is prevented by a nonconducting band of connective tissue at the atrioventricular junction called the ANNULUS FIBROSIS. The impulse is delayed by the atrioventricular node to allow time for atrial contraction before ventricular excitation. After the slight delay the impulse is propagated rapidly via the atrioventricular (His) bundle to the BUNDLE BRANCHES located in the top of the ventricular septum. The bundle branches divide on either side of the ventricular septum into branches that terminate in a highly ramified network of PURKINJE FIBERS that will activate both ventricles simultaneously, beginning at the APEX. The impulse is transferred from the Purkinje network into the working ventricular myocardium.
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Kot, Jacek. "Operation of Implantable Cardiac Devices in Hyperbaric Conditions." In Pacemakers and Defibrillators [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.102659.
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Implantable devices, including Implantable Cardiac Defibrillators (ICD) and Pacemakers (PM), are being seen with increasing frequency in patients wanting to conduct recreational diving or referred for Hyperbaric Oxygen Therapy (HBOT). Under hyperbaric conditions, these devices are at risk of malfunction, mostly by changes of ambient pressure. In some cases, manufacturers publish information on how their devices operate under increased pressure. Unfortunately, this is not always the case, and for other devices, someone must perform an individual risk-benefit analysis specific for single patient and his/her implanted device. In case of medical treatment, such analysis must take into account the patient’s clinical condition, the indication for HBOT, and the capability of the HBOT facility for monitoring and intervention in the chamber.
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Kansiime, Peninah, Shannon John Said, and Sarah Eyaa. "“What Kind of Blackfella Are You Anyway?”." In Advances in Electronic Government, Digital Divide, and Regional Development, 420–43. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-3380-5.ch017.
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Social media can bring together diverse people, providing a platform to facilitate discussions about various issues across races, cultures, and religions. These platforms shape social change by bringing to light individuals' perceptions on social issues whilst simultaneously becoming echo chambers that exclude contradictory or dissenting voices. Increases in digital violence, racism, and discrimination can be seen on social media websites, particularly towards those whose ideas challenge the dominant discourses of their cultural groups. The authors explore this phenomenon through four case studies: Aboriginal Australian academic Anthony Dillon, Aboriginal politician Jacinta Nampijinpa Price, African American former gubernatorial candidate and radio presenter Larry Elder, and African American political commentator Candace Owens. Their experiences are considered through the lens of free speech, civil discourse, and how social media users choose vilification instead of debate to address dissenting voices.
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Ecker, Alejandro, and Martin Soto Payva. "Argentina." In The Politics of Legislative Debates, 110–29. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198849063.003.0007.
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This chapter explores the institutional setting and identifies the critical determinants of parliamentary speechgiving in the Argentine Chamber of Deputies between 2001 and 2016. We understand and describe access to the parliamentary floor as a complex interplay between formal and informal regulations, which govern the distribution of floor time as a scarce resource between, and its allocation within, political parties. The empirical analysis combines textual data on plenary session speeches with both individual and institutional characteristics of over 1000 Argentine MPs. The analysis results indicate that participation in parliamentary debate is driven by a combination of individual traits such as seniority and MPs’ ability to hold institutionally powerful leadership positions such as that of the parliamentary bloc. At the same time, we observe that the government–opposition divide plays no significant role in parliamentary floor access, which speaks to the Argentine Chamber of Deputies’ general characterization as a consensual institution.
Conference papers on the topic "Diving chambers"
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Deng, Yipan, Yinshui Liu, Fan Li, Pengyun Tian, and Na Miao. "Research on Sealing Performance in High Pressure Oil-Free Miniature Air Compressor." In ASME/BATH 2017 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fpmc2017-4248.
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High pressure oil-free miniature air compressor has an irreplaceable role in some high demand areas such as cooling, scuba diving and pneumatic catapult due to its remarkable advantages such as compacted size, lightened weight and clean output gas. As the important sealing component in the high pressure oil-free miniature air compressor, piston rings hold the properties such as tiny diameter (less than 10mm), high sealing pressure (up to 410 bar) and high surrounding temperature (up to 500K), which make them distinctive from conventional piston rings. A mathematical model was established to simulate the pressure distribution of the compressor chamber, as well as the gap between the sealing rings. Sensitive parameters were considered to investigate their effects on the sealing performance such as the number and the cut size of the piston rings, the suction and discharge pressure and the rotary speed. The mathematical model was verified by comparing to published experimental research work. These work help to reveal the severe non-uniformity of the pressure distribution of different chambers, which were suggested be the primary cause of the premature failure of the sealing rings, thus improving the sealing performance and the service life of the air compressor.
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Ahlen, C., I. Leinan, and M. Berg. "Guidelines for Cleaning/Disinfection in Chamber Systems Used in Operational Saturation Diving." In SPE Health, Safety and Environment in Oil and Gas Exploration and Production Conference. Society of Petroleum Engineers, 1991. http://dx.doi.org/10.2118/23234-ms.
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Jansen, S., A. Nolte, M. Meyer, Jan-Christoffer Lüers, D. Fürstenberg, V. Müller, JP Klußmann, and R. Lang-Roth. "Diving or flying with cochlear implant? Investigations in a hypo / hyperbaric pressure chamber." In Abstract- und Posterband – 91. Jahresversammlung der Deutschen Gesellschaft für HNO-Heilkunde, Kopf- und Hals-Chirurgie e.V., Bonn – Welche Qualität macht den Unterschied. © Georg Thieme Verlag KG, 2020. http://dx.doi.org/10.1055/s-0040-1711111.
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Geiss, Henri-Jacques, Flora Sakketou, and Lucie Flek. "OK Boomer: Probing the socio-demographic Divide in Echo Chambers." In Proceedings of the Tenth International Workshop on Natural Language Processing for Social Media. Stroudsburg, PA, USA: Association for Computational Linguistics, 2022. http://dx.doi.org/10.18653/v1/2022.socialnlp-1.8.
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Aidarinis, J., and A. Goulas. "Enhanced CFD Modelling and LDA Measurements for the Air-Flow in an Aero-Engine Front Bearing Chamber: Part I." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26060.
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Modern aero-engine development requires also a gradual increase in the overall effectiveness of lubrication systems. This particularly applies to bearing chambers where a complex two-phase flow is formed by the interaction of the sealing air and the lubrication oil. It is important to increase the level of understanding of the flow field inside the bearing chamber and to develop engineering tools in order to optimize its design and improve its performance. To achieve this an experimental and a computational study of the whole front bearing chamber were carried out for a range of shaft rotational speeds and sealing air mass flow. The experimental measurements of the air velocity inside the chamber were carried out using a Laser Doppler Anemometer (LDA) in two-phase air/oil flow conditions. The experimental facility is a 1:1 scale model of the front bearing chamber of an aero-engine. Computational 3D modeling of the bearing chamber was performed. The bearing gap and the presence of lubrication oil was modeled as an anisotropic porous medium with functions relating the pressure loss of the air coming through the gap and the tangential component of velocity of the air exiting the gap of the ball bearing with the air-flow rate through the gap and the rotational speed of the shaft. The methodology to obtain the above mentioned functions and the results of the detailed study are given in [1]. The enhanced computational model of the chamber implementing the law of pressure drop of the ‘lubricated’ bearing and the function of modeling the tangential velocity of the air exiting the bearing, was used to calculate the flow field for the full range of the measurements. A limiting curve dividing the operational map of the bearing chamber into two areas was predicted. Large vortical and swirling structures dominate the flow and they vary in size according to the position of the operation point relative to the limiting curve. Operation above the limiting curve leads to flow classified as type I with air going through the ball bearing while for operation below the limiting curve line the flow is classified as type II, there is no air-flow through the bearing gap.
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Klausen, Hanne, Per Flood, John O. Hjelle, and Holm Holmsen. "MORPHOLOGICAL CHANGES OF BLOOD PLATELETS IN MAN DURING DEEP SATURATION DIVING." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643534.
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The small number of reports concerning blood platelets during deep saturation diving have shown that there may be a decrease in the number of circulating platelets. Gas bubbles are often present in theblood during decompression. In vitro, gas bubbles activate platelets, and alter the shape from discoidto spherical configuration with multiple, blunt spikes. This study was done to investigate if there are changes in the morphology of human blood platelets during deep diving. An 18 day long experimentalon-shore saturation dive to 360 msw was performed at NUTEC 1986. Bloodsamples were obtained from the 6 divers on 6 occations: pre-dive control, at 360 msw, 300 msw, 140 msw, 1 and 3 days after surfacing. Using 18 G Wasserman needles antecubital venous blood samples (3ml) were collected directly into the fixative agent (7 ml of 2% glutardialdehyde in cacodylate buffer) whilestill in the hyperbaric chamber. The samples were then decompressed,and the platelets separated from the blood by centrifugation at roomtemperature for 10 min at 190 g. Preparation to transmission electron microscopy included post-fixation in osmium tetroxide, staining uranyl-en-bloc and eventually lead, dehydration and embedding in Epon.Ultrathin sections were examined by a Philips 300 I electron microscope. The examination revealed alterations in both platelet size and shape in the course of the dive. The mean platelet area was increased during and immidiately after thedive, the greatest increase occuring at 360 msw. There was a high incidence of shape changed plateletswith spherical configuration and multiple, blunt spikes. This form was by far most abundant at 360 msw, and the morphology normalised towards surface. This rises the suspection of a pressure-related rather rhan bubble-related effect and the results indicate that plateletsin circulation can be activated bypressure itself
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Zordan, Enrico, and Farid Amirouche. "Design and Analysis of a Double Superimposed Chamber MEMS Micropump." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81709.
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The mathematical model of a double chamber pump is obtained by dividing the problem in two separate ones. The first that considers inertia force and viscous loss in relation of actuation pressure and frequency is obtained, and then a model of the nozzle/diffuser elements is introduced. The value of the flow rate obtained from the first model is then introduced in the second to determine the loss coefficients starting from geometrical properties and flow velocity. Then the loss coefficients obtained are used in the first model to obtain a new value of flow rate. These two models have been implemented in a Matlab® code that numerically reaches convergence repeating the cycle above. Using this model is possible to predict performances of the micropump only from geometrical properties and actuation parameters, without assumptions about the loss coefficients. A similar model is obtained for a single-chamber pump with geometrical dimensions equal to each chamber of the double chamber pump, and the results from both the models are then compared for equal applied actuation pressure and frequency. Results gives for our pump a max flow working frequency that is about 30% lower than the single chamber design, with the same applied pressure on the membrane, same geometry of parts and materials, and a max flow rate that is about 140% of the single chamber max flow in max flow conditions. For lower frequencies flow rate is more than twice, and maximum membrane deflection smaller up to 20% less. These results can change due to geometrical and material properties. Finally the influences of every significant geometrical property on flow rate, maximum flow frequency, loss coefficients and membrane strain are examined, and the nozzle/diffuser initial width and chamber side length are founded to be the most important dimension.
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Inaba, Kazuki, Yoshimitsu Kobashi, Gen Shibata, and Hideyuki Ogawa. "Thermal efficiency improvement in twin shaped semi- premixed diesel combustion with a combustion chamber dividing fuel sprays and optimization of fuel ignitability." In 2023 JSAE/SAE Powertrains, Energy and Lubricants International Meeting. 10-2 Gobancho, Chiyoda-ku, Tokyo, Japan: Society of Automotive Engineers of Japan, 2023. http://dx.doi.org/10.4271/2023-32-0051.
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<div class="section abstract"><div class="htmlview paragraph">The authors have reported significant smoke reduction in twin shaped semi-premixed diesel combustion with a newly designed combustion chamber to distribute the first and the second sprays into upper and lower layers. However, the first stage premixed combustion tends to advance far from the TDC, resulting in lowering of thermal efficiencies. In this report, improvement of thermal efficiency by optimizing the combustion phase with lower ignitability fuels was identified with the divided combustion chamber. The experiment was conducted with four fuels with different cetane numbers. The first stage premixed combustion can be retarded to the optimum phase with the fuel with cetane number 38, establishing high efficiencies.</div></div>
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Nuckols, M. L., and K. W. VanZandt. "Development of an Oxygen “Metabolizer” to Control Oxygen Levels in the Closed Cabin of Submarine Rescue Vehicles." In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28039.
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The U.S. Navy is committed to maintaining the capability of rescuing survivors from a disabled submarine, including situations where the disabled submarine becomes internally pressurized due to flooding, leakage of compressed gas supplies, or through use of auxiliary breathing systems. Efficient submarine rescue requires that pressurized crewmembers be decompressed more rapidly than current decompression procedures allow when using air. The Navy Experimental Diving Unit in Panama City, FL has shown that crew decompression can be accelerated significantly by pre-breathing oxygen. Unfortunately, such oxygen pre-breathing can result in oxygen buildup in the cabin atmospheres of the submarine, and/or rescue chamber through leakage around the face seal of the oxygen masks. High levels of oxygen can create hazardous conditions within the cabin atmosphere due to fire potential and/or oxygen toxicity concerns. This paper addresses the concept development of an oxygen “metabolizer” using a hydrogen catalytic reactor to consume excess oxygen within the closed cabin atmosphere of a rescue vehicle. Such a catalytic reactor has also been shown to give an effective method of reducing the level of oxygen in diver breath heating and diver whole-body heating systems.
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Vejzović, Anel, Faruk Tandir, Nedžad Hadžiomerović, Rizah Avdić, and Nejra Dučić. "Exotic Animals’ Vascular System Characteristics and its Application in Clinical Practice." In Socratic lectures 10. University of Lubljana Press, 2024. http://dx.doi.org/10.55295/psl.2024.ii5.
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Abstract: Veterinary practice commonly involves caring for domestic and companion animal. Since the trend of owning exotic pets is rapidly increasing, veterinarians often treat exotic patients as well. As a result, veterinarians are facing increased demands for specialized skills and knowledge. This article aims to provide a concise review of the anatomy of the vascular system in exotic animals and its relevance in clinical practice. Snakes, lizards and chelonians have 3-chambered heart with 2 atria and one partially divided ventricle whereas crocodiles have 4-chambered heart. It is important to consider these characteristics during the anesthesia in reptiles since blood shunting affects changes in blood pressure, oxygen level and other anesthetic parameters. In birds, the cardiovascular system is crucial in enduring the exhausting physical activities such as swimming, flying or diving and running. Birds have renal portal system which consists of cranial and caudal renal portal vein. The recommendation of avoiding drug application in the hindlimbs of birds is present for a long time. This is valid not only for birds, but for reptiles, amphibians and most fish. The ventricle of amphibians is trabeculated, which minimizes blood shunting through various anatomical and physiological features. During biphasic systole, the left and right side of the ventricle contract separately, directing blood in different parts of aortic arches. Due to the complexity of the exotic animals, thorough education added in veterinary curricula is needed. Keywords: amphibians, birds, cardiovascular, clinical, reptiles
Reports on the topic "Diving chambers"
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Dudoit, Alain. Les espaces européens communs de données : une initiative structurante nécessaire et adaptable au Canada. CIRANO, October 2023. http://dx.doi.org/10.54932/ryht5065.
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Le Rapport bourgogne, publié par le CIRANO en juillet 2023, préconise la création d'un espace commun de données dans le corridor commercial stratégique des Grands Lacs et du Saint-Laurent d'ici 2030. Cette proposition s’appuie notamment sur trois rapports distincts de politiques publiés en 2022 par le groupe de travail national sur la chaîne d’approvisionnement, le Conseil des ministres responsables des transports et de la sécurité routière (COMT) et le Comité permanent de la Chambre des communes sur les transports, l'infrastructure et les collectivités. Le constat posé et les recommandations qui découlent de ces rapports soulèvent des questions de fond qui sont au centre des enjeux critiques de gouvernance, de culture d’organisation, de capacité d’exécution, de mobilisation des parties prenantes du public et du privé, ainsi que de la sous-utilisation des données au sein de l’appareil gouvernemental canadien mis à rude épreuve par des années de retard et exacerbée par les perturbations récentes liées à des catastrophes climatiques anticipées. La création d’un espace commun de données est envisagée comme un investissement structurant de l'infrastructure essentielle du Canada pour le transport intermodal et la chaîne d’approvisionnement. Ce document de travail sur les Espaces Européens Communs de Données (EECD) prolonge la synthèse et les recommandations publiées en juillet dernier. Face à l’accélération de l’économique numérique, la gouvernance et le partage efficace des données sont devenus des enjeux fondamentaux pour les politiques publiques à tous les niveaux de juridictions et dans tous domaines de l’activité humaine. Le présent document vise à examiner les initiatives et les défis associés à la gouvernance des données, en mettant particulièrement l'accent sur les Espaces Européens Communs de Données (EECD) et leur pertinence pour le contexte canadien. Il explore la complexité inhérente à la gouvernance des données, qui doit concilier les spécificités sectorielles avec des principes de gouvernance plus universels. Ce faisant, il souligne l'importance d'une action stratégique et coordonnée pour maximiser les avantages sociaux et économiques des données. Le document de travail sur les EECD étend la portée du Rapport bourgogne en fournissant une analyse opérationnelle de l'initiative en cours au sein de l'Union européenne (UE). Celle-ci découle de la stratégie européenne des données de 2020 et vise à établir douze espaces communs de données dans des secteurs stratégiques, y compris la mobilité et les transports. Le document se divise en trois parties principales. La première partie offre un aperçu des politiques publiques relatives aux données au Canada et dans l'UE entre 2018 et 2023. La deuxième partie se concentre sur les implications et les leçons tirées de l'analyse d'impact qui soutient l'adoption de la législation sur la gouvernance des données par les institutions européennes. Cette loi vise à établir un cadre réglementaire pour la création des espaces communs de données en Europe. La troisième partie aborde le déploiement actuel des EECD, en soulignant les étapes clés et les processus en cours. Le document met en évidence des similitudes notables entre l'UE et le Canada en ce qui concerne l'identification des enjeux et la formulation des objectifs de politique publique en matière de données. Il souligne aussi des différences entre ces deux partenaires stratégiques dans l’optimisation du partage des données entre les juridictions et parties prenantes. Ces deux partenaires stratégiques se distinguent cependant par une différence fondamentale: l'absence d'une mutualisation efficace des ressources au sein de l’appareil intergouvernemental canadien dans la poursuite d’objectifs communs face à des enjeux majeurs communs tel celui des données à la grande différence de l’entreprise des EECD par l’UE dans la poursuite d’objectifs identiques de positionnement comme chef de file mondial l’économie des données. Cette absence de considération et, encore moins, d’action conjointe par l’appareil intergouvernemental canadien de mise en œuvre d’une stratégie commune des données au Canada est dommageable. Pour être efficace, la réponse canadienne doit être agile, axée sur les résultats, et intégrée à travers les différentes juridictions. La gestion rigoureuse, l’utilisation responsable et le partage organisé des données au sein et entre les différentes juridictions sont des éléments cruciaux pour aborder les défis complexes et les risques majeurs auxquels le Canada est confronté. Ni le gouvernement fédéral ni ceux des provinces ne sont actuellement bien positionnés pour traiter ensemble les données comme un actif stratégique commun. La résolution des obstacles réglementaires, juridiques et techniques à l'échange de données entre juridictions et organisations nécessite la création d'un espace commun de données qui à son tour implique une combinaison des outils et des infrastructures requises à cette fin, ainsi qu'un traitement des questions de confiance notamment par des règles communes.