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It is a more stringent standard, using an anvil striker that creates a point load, and allowing no more than 18 kN of force to be transmitted to attain Level 1 protection (EN-1621-2 CE Level 1). Protectors that allows less than 9 kN of force to be transmitted can attain a Level 2 protection (EN-1621-2 CE Level 2).
A selvage (US English) or selvedge (British English) is a "self-finished" edge of a piece of fabric which keeps it from unraveling and fraying. [1] [2] The term "self-finished" means that the edge does not require additional finishing work, such as hem or bias tape, to prevent fraying.
Chipseal (also chip seal or chip and seal or spray seal) is a pavement surface treatment that combines one or more layers of asphalt with one or more layers of fine aggregate. In the United States, chipseals are typically used on rural roads carrying lower traffic volumes, and the process is often referred to as asphaltic surface treatment .
An arête is a thin ridge of rock that is formed by glacial erosion. [2] Pressure ridge (ice) An ice pressure ridge is a ridge of deformed ice along the boundaries of individual ice floes when the ice floes on a lake or ocean collide and compress their edges. The average height of a sea ice pressure ridge is between 5 and 30 meters. [8]
The Blue Ridge two-lined salamander ranges in size from 2 3/4 - 4 1/2 inches (7-10.7 cm) and ranges in color from bright yellow, yellow-orange, to orange. There are two black dorsolateral lines that usually break into dots or blotches around the middle of the tail. There are often scattered black dots on the back.
Otta seal is formed by adding graded aggregate to a soft bituminous binding agent. The agent is usually emulsified asphalt. Bituminous binder application rates are between 1.9 liter/m 2 (0.42 US gallon/yard 2) and 2.4 liter/m 2 (0.53 US gallon/yard 2) – the value is dependent on aggregate gradation and type. Low quality, local aggregates are ...
Large crabeater seals can weigh up to 300 kg (660 lb). [7] Pups are about 1.2 metres (3.9 ft) in length and 20 to 30 kilograms (44 to 66 lb) at birth. While nursing, pups grow at a rate of about 4.2 kilograms (9.3 lb) a day, and grow to be around 100 kilograms (220 lb) when they are weaned at two or three weeks. [3] [8]
Internal structure of a first-year ice ridge with a 2 m sail height, MOSAiC expedition, July 4, 2020. A pressure ridge, when consisting of ice in an oceanic or coastal environment, is a linear pile-up of sea ice fragments formed in pack ice by accumulation in the convergence between floes.