The Experts below are selected from a list of 18 Experts worldwide ranked by ideXlab platform
Jeričević Luka - One of the best experts on this subject based on the ideXlab platform.
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Anchors of Ships and Anchoring Maneuver
University of Split. Faculty of Maritime Studies. Department of nautical studies., 2018Co-Authors: Jeričević LukaAbstract:Sidro je naprava, izrađena od metala, koja se obara s broda, odnosno drugog plovnog objekta, na morsko dno kako bi ostao na jednom mjestu, odnosno kako ga vjetar i struje ne bi pomicale. Sidro je vezano za brod željeznim lancem ili užetom. Sidreni uređaj obično se sastoji od dva glavna sidra smještena u sidrenim ždrijelima, sidrenih lanaca, sidrenog zapora, sidrenog vitla i lančanika. Za obaranje i izvlačenje sidra danas se najčešće koriste električna vitla. Manevar sidrenja je postupak, kojim se brod obarajući jedno ili dva sidra, održava na željenoj poziciji u luci ili sidrištu zbog promjenjivog djelovanja struje, valova i vjetra.Anchor is a device, made of metal, which runs from a ship or another floating object to the sea floor to prevent the craft from drifting due to wind or current. The anchor is linked to a ship by an iron chain or rope. The anchor device usually consists of two main anchors located in hawse pipes, anchor chains, anchor stoppers, windlass and chain locker. For letting go and heaving anchors, electric Windlasses are most commonly used today. Anchoring maneuver is a process by which a boat is, letting go one or two anchors, held at the desired position in the harbor or anchorage due to the variable current, wave and wind action
Marconi N - One of the best experts on this subject based on the ideXlab platform.
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Tradition and technological innovation on roman building sites from the 16th to the 18th century: construction machines, building practice and the diffusion of technical knowledge.
Electa, 2006Co-Authors: Marconi NAbstract:The triumphant raising of the Vatican obelisk, conducted by Domenico Fontana under Sixtus V between April and September 1586, had a knock-on effect in the building industry: it unleashed a process of innovation and development in building technology. The heir of Roman imperial mechanics, this technology would reach a level of efficiency and functionality between the sixteenth and eighteenth century not to be surpassed for a long time. It was favoured, on the one hand, by the new impulse registered in Roman building practice from the fifteenth century on and, on the other, by the renewed interest in mechanics, aimed at the invention of new and more functional apparatus for the building industry. But alongside these mechanical supports, a decisive role was also played by the development of a quite extraordinary organizational, managerial and technical apparatus that had its main organ of propulsion in the Reverenda Fabbrica di San Pietro, at once an experimental laboratory and an unrivalled reservoir of resources, both technical and professional. In this system, the sector of building machinery assumed a major role. It became an integral and indispensable part of architectural practice. This was not only thanks to the progress of the theory of machinatio, but above all thanks to the gradual advancement of the apparatus developed to support the building industry by technical experts in the field. The provisional apparatus, the machines and operational procedure developed by Fontana are an integral part of a wider operational programme, inspired by flexibility in the use of machines and equipment and their adaptation to the ordinary practice of building. The huge financial investment implied by such a programme was one that only the Fabbrica di San Pietro could afford. The investment, however, could be recouped by the hiring out of machinery to other Roman building sites. This practice continued and is still documented in the nineteenth century, for instance in the restoration of the portico of San Paolo fuori le Mura or in the raising of dedicatory columns and obelisks. The prolonged use of this building apparatus is proof of the traditional and pragmatic character that informed executive practice and building technology right down to the introduction of construction in reinforced concrete. Until then, wood, iron and rope would remain the main constituents not only of such basic building apparatus as winches, Windlasses, capstans, scaffolding, trestles and derricks, but also of hoisting gear such as traglie and girelle (pulleys). Each modification or innovation could be tested, and finally adopted, only by use and direct practice. In this situation of marked traditionalism, the diffusion of technical know-how, almost exclusively of empirical and pragmatic character, remained in the hands of the master builders and sampietrini (maintenance men) of the Fabbrica di San Pietro, such as the unlettered expert (“homo sanza Lettere”) Nicola Zabaglia, or technical experts of various origin and training. The frequent consultations between experts, the technical advice sought from the most skilled building foremen (capomastri), and the fruitful exchange of craftsmen between various building sites in Rome, generated a spontaneous and immediate transmission of know-how in the technical and mechanical field. Only rarely did this know-how avail itself of the nascent science of mechanics, from which it long remained separated. To the precepts of theoretical mechanics it seemed to prefer the more reassuring precedent set by the well-tried building practices of antiquity and the Renaissance
Guo Yuhong - One of the best experts on this subject based on the ideXlab platform.
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application of Windlasses and pulley block in boiler drum installation
Mechanical Engineering & Automation, 2006Co-Authors: Guo YuhongAbstract:This article describes the hoisting method in 670t/h boiler drum installation that uses 10t electric Windlasses and 100t pulley-block as a hoisting system,gives detailed analysis of this system and ensures its practicability and economic result.
David G Baer - One of the best experts on this subject based on the ideXlab platform.
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which improvised tourniquet Windlasses work well and which ones won t
Wilderness & Environmental Medicine, 2015Co-Authors: John F Kragh, Timothy E Wallum, James K Aden, Michael A Dubick, David G BaerAbstract:Objective Improvised tourniquets in first aid are recommended when no scientifically designed tourniquet is available. Windlasses for mechanical advantage can be a stick or pencil and can be used singly or multiply in tightening a tourniquet band, but currently there is an absence of empiric knowledge of how well such Windlasses work. The purpose of the present study was to determine the performance of improvised tourniquets in their use by the type and number of Windlasses to improve tourniquet practice. Methods A simulated Leg Tourniquet Trainer was used as a manikin thigh to test the effectiveness of improvised tourniquets of a band-and-windlass design. Two users made 20 tests each with 3 types of Windlasses. Tests started with 1 representative of a given type (eg, 1 pencil), then continued with increasing numbers of each windlass type until the user reached 100% effectiveness as determined by cessation of simulated blood flow. Windlass types included chopsticks, pencils, and craft sticks. Results Effectiveness percentages in stopping bleeding were associated inversely with breakage percentages. Pulse stoppage percentages were associated inversely with breakage. The windlass turn numbers, time to stop bleeding, the number of Windlasses, and the under-tourniquet pressure were associated inversely with breakage. The windlass type was associated with breakage; at 2 Windlasses, only chopsticks were without breakage. Of those windlass types that broke, 20.7% were chopsticks, 26.1% were pencils, and 53.2% were craft sticks. Conclusions A pair of chopsticks as an improvised tourniquet windlass worked better than pencils or craft sticks.
John F Kragh - One of the best experts on this subject based on the ideXlab platform.
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which improvised tourniquet Windlasses work well and which ones won t
Wilderness & Environmental Medicine, 2015Co-Authors: John F Kragh, Timothy E Wallum, James K Aden, Michael A Dubick, David G BaerAbstract:Objective Improvised tourniquets in first aid are recommended when no scientifically designed tourniquet is available. Windlasses for mechanical advantage can be a stick or pencil and can be used singly or multiply in tightening a tourniquet band, but currently there is an absence of empiric knowledge of how well such Windlasses work. The purpose of the present study was to determine the performance of improvised tourniquets in their use by the type and number of Windlasses to improve tourniquet practice. Methods A simulated Leg Tourniquet Trainer was used as a manikin thigh to test the effectiveness of improvised tourniquets of a band-and-windlass design. Two users made 20 tests each with 3 types of Windlasses. Tests started with 1 representative of a given type (eg, 1 pencil), then continued with increasing numbers of each windlass type until the user reached 100% effectiveness as determined by cessation of simulated blood flow. Windlass types included chopsticks, pencils, and craft sticks. Results Effectiveness percentages in stopping bleeding were associated inversely with breakage percentages. Pulse stoppage percentages were associated inversely with breakage. The windlass turn numbers, time to stop bleeding, the number of Windlasses, and the under-tourniquet pressure were associated inversely with breakage. The windlass type was associated with breakage; at 2 Windlasses, only chopsticks were without breakage. Of those windlass types that broke, 20.7% were chopsticks, 26.1% were pencils, and 53.2% were craft sticks. Conclusions A pair of chopsticks as an improvised tourniquet windlass worked better than pencils or craft sticks.
