Transmission (mechanical device)A transmission (also called a gearbox) is a mechanical device which uses gears to change the speed or direction of rotation in a machine. Many transmissions have multiple gear ratios, but there are also transmissions that use a single fixed gear ratio. Most currently-produced passenger cars with petrol or diesel engines use transmissions with 5-8 forward gear ratios and one reverse gear ratio. Electric vehicles typically use a single-speed or two-speed transmission.
Mode of transportMode of transport is a term used to distinguish between different ways of transportation or transporting people or goods. The different modes of transport are air, water, and land transport, which includes rails or railways, road and off-road transport. Other modes of transport also exist, including pipelines, cable transport, and space transport. Human-powered transport and animal-powered transport are sometimes regarded as their own mode, but never fall into the other categories.
Geraldine of AlbaniaCountess Géraldine Margit Virginia Olga Mária Apponyi de Nagy-Appony (Geraldine; 6 August 1915 – 22 October 2002) was Queen of the Albanians from her marriage to King Zog I on 27 April 1938 until the King was deposed on 7 April of the following year. Geraldine was born in Austria-Hungary into the noble Apponyi family. Her family fled to Switzerland in 1918, when the monarchy of Austria-Hungary was abolished. They returned to Hungary in 1921.
Continuously variable transmissionA continuously variable transmission (CVT) is an automatic transmission that can change through a continuous range of gear ratios. This contrasts with other transmissions that provide a limited number of gear ratios in fixed steps. The flexibility of a CVT with suitable control may allow the engine to operate at a constant RPM while the vehicle moves at varying speeds. CVTs are used in cars, tractors, side-by-sides, motor scooters, snowmobiles, bicycles, and earthmoving equipment.
Geraldine, New ZealandGeraldine (Heratini) is a town in the Canterbury region in the South Island of New Zealand. It is about 140 km south of Christchurch, and inland from Timaru, which is 38 km to the south. Geraldine is located on State Highway 79 between the Orari and Hae Hae Te Moana Rivers and 45 kilometres to the east of Fairlie. There is evidence of Māori travels through the Geraldine area and artifacts and carvings have been discovered in the nearby areas of Beautiful Valley, Gapes Valley and Kakahu.
Airborne transmissionAirborne transmission or aerosol transmission is transmission of an infectious disease through small particles suspended in the air. Infectious diseases capable of airborne transmission include many of considerable importance both in human and veterinary medicine. The relevant infectious agent may be viruses, bacteria, or fungi, and they may be spread through breathing, talking, coughing, sneezing, raising of dust, spraying of liquids, flushing toilets, or any activities which generate aerosol particles or droplets.
Geraldine MuchaGeraldine Thomson Mucha (5 July 1917 – 12 October 2012) was a Scottish composer. She was born in London and studied at the Royal Academy of Music. She married the Czech writer Jiří Mucha, son of the painter Alphonse Mucha, and in 1945 moved to Prague. She lived there for the greater part of the next sixty years. Geraldine Mucha was born in London on 5 July 1917. She was the only child of Marcus Thomson (sometimes spelled Thomsen) who came from Glasgow and of Maisie Evans, a New Zealander.
Transmission electron microscopyTransmission electron microscopy (TEM) is a microscopy technique in which a beam of electrons is transmitted through a specimen to form an image. The specimen is most often an ultrathin section less than 100 nm thick or a suspension on a grid. An image is formed from the interaction of the electrons with the sample as the beam is transmitted through the specimen. The image is then magnified and focused onto an imaging device, such as a fluorescent screen, a layer of photographic film, or a sensor such as a scintillator attached to a charge-coupled device.
USS GeraldineUSS Geraldine (SP-1011) was a United States Navy patrol vessel in commission from 1917 to 1918. Geraldine was built in 1916 as the private motorboat Albion by George Lawley & Son at Neponset, Massachusetts. She later was renamed Geraldine. On 24 July 1917, the U.S. Navy acquired Geraldine from her owner, Frederick S. Fish of South Bend, Indiana, for use as a section patrol boat during World War I. Fish delivered her to the Navy at Chicago, Illinois, on 8 September 1917, and she was commissioned as USS Geraldine (SP-1011) on 13 September 1917 with her owner.
Electron diffractionElectron diffraction refers to changes in the direction of electron beams due to interactions with atoms. Close to the atoms the changes are described as Fresnel diffraction; far away they are called Fraunhofer diffraction. The resulting map of the directions of the electrons far from the sample (Fraunhofer diffraction) is called a diffraction pattern, see for instance Figure 1. These patterns are similar to x-ray and neutron diffraction patterns, and are used to study the atomic structure of gases, liquids, surfaces and bulk solids.
Coherence (physics)In physics, coherence expresses the potential for two waves to interfere. Two monochromatic beams from a single source always interfere. Physical sources are not strictly monochromatic: they may be partly coherent. Beams from different sources are mutually incoherent. When interfering, two waves add together to create a wave of greater amplitude than either one (constructive interference) or subtract from each other to create a wave of minima which may be zero (destructive interference), depending on their relative phase.
