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Design of a cloth antimacassar Armchair with antimacassar-Sheffield Mayors Parlour Antimacassars on rail carriage seats. An antimacassar / ˌ æ n t ɪ m ə ˈ k æ s ər / is a small cloth placed over the backs or arms of chairs, or the head or cushions of a sofa, to prevent soiling of the permanent fabric underneath. [1]
Kitimat — year-round deep-sea shipping connects North America to the Pacific Ocean and the Pacific Rim. [12] According to the Transport Canada's Technical Review Process of Marine Terminal Systems and Transshipment Sites (TERMPOL) the passageway into the Port of Kitimat is "safely accessible by Panamax vessels, VLCC (Very Large Crude Carrier ...
An early use of underwater acoustic positioning systems, credited with initiating the modern day development of these systems, [15] involved the loss of the American nuclear submarine USS Thresher on 10 April 1963 in a water depth of 2560m. [16] An acoustic short baseline (SBL) positioning system was installed on the oceanographic vessel USNS ...
A multibeam echosounder is a device typically used by hydrographic surveyors to determine the depth of water and the nature of the seabed. Most modern systems work by transmitting a broad acoustic fan shaped pulse from a specially designed transducer across the full swathe acrosstrack with a narrow alongtrack then forming multiple receive beams (beamforming) that are much narrower in the ...
Water is a transparent, tasteless, odorless, and nearly colorless chemical substance. Its chemical formula is H 2 O, meaning that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. Water is the name of the liquid state of H 2 O at standard ambient temperature and pressure.
The chemical composition of water in aquatic ecosystems is influenced by natural characteristics and processes including precipitation, underlying soil and bedrock in the drainage basin, erosion, evaporation, and sedimentation. [13] All bodies of water have a certain composition of both organic and inorganic elements and compounds. Biological ...
Scientific diving is any diving undertaken in the support of science, so activities are widely varied and may include visual counts and measurements of organisms in situ, collection of samples, surveys, photography, videography, video mosaicing, benthic coring, coral coring, placement, maintenance and retrieval of scientific equipment.
The science of underwater diving includes those concepts which are useful for understanding the underwater environment in which diving takes place, and its influence on the diver. It includes aspects of physics , physiology and oceanography .