The tandem bicycle or twin is a form of bicycle (occasionally, a tricycle) designed to be ridden by more than one person. The termtandem refers to the seating arrangement (fore to aft, not side by side), not the number of riders. A bike with two riders side by side is called a sociable.
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The potato industry in the Anding District of Dingxi City, Gansu Province aims to build a “Chinese potato capitalâ€, highlighting the concept of “saving†in all aspects and vigorously promoting the construction of “economized†parks. This year, the area continues to experience droughts and farmland is cracked due to lack of water. In order to reduce the impact of drought on potato production, the widespread adoption of black plastic film-based mulching potato planting technology has been successful.
Portable monitoring system for soil moisture temperature and remote transmission system and fixed wireless agricultural weather monitoring station two monitoring systems. The two systems can timely monitor local meteorological parameters such as precipitation, soil moisture content, soil temperature, solar radiation, air temperature, air humidity, wind speed, and wind direction, and perform soil moisture comparison before and after coating. The local responsible person said that it is believed that these instruments from Zhejiang Top can provide accurate monitoring data to better guide the production of dry farming.
Patents related to tandem bicycles date from the late 1890s.In approximately 1898, Mikael Pedersen developed a two-rider tandem version of his Pedersen bicycle that weighed 24 pounds, and a four-rider, or "quad", that weighed 64 pounds. They were also used in the Second Anglo-Boer War. Tandem popularity began to decline after WWII until a revival started in the late sixties. In the UK The Tandem Club was founded in 1971, new tandems came on to the market from the French companies Lejeune and Gitane, and in the USA Bill McReady founded Santana Cycles in 1976. Modern technology has improved component and frame designs, and many tandems are as well-built as modern high-end road and off-road bikes.
Tandems can have more than 2 riders - tandem refers to the arrangement of the riders one behind the other rather than the number of riders. Bicycles for three, four, or five riders are referred to as "triples" or "triplets", "quads" or "quadruplets", and "quints" or "quintuplets" respectively. One such familiar to UK TV viewers was the "trandem" ridden by The Goodies. Originally a 2-man tandem with an extra "dummy" seat attached, a full 3-man version was built for them by Raleigh.
Some designs such as the DaVinci can allow independent pedaling through the use of multiple freewheels. [4] In another design, the rear rider steers and propels the rear wheel with pedals, and the front rider propels the front wheel with both hands and feet.
From mid-July 2011 to mid-August 2011, in order to better monitor the soil moisture temperature, etc., to guide agricultural production, the Potato Dryland Water Saving Technology Demonstration Zone in Anding District, Zhejiang Province, ordered a portable soil moisture temperature and temperature measurement from Zhejiang Top Instrument. Instrument and remote transmission system and fixed wireless agricultural weather monitoring station two monitoring systems. Zhejiang Tops EQUIPMENT professional technicians went to Gansu, Yunnan, and Shandong province dryland water-saving technology demonstration area, and provided professional guidance and technical training for how to install and use the fixed wireless agricultural comprehensive weather station.