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In the United States, impact attenuators are tested and classified according to AASHTO Manual for Assessing Safety Hardware (MASH), [13] first issued in 2016 to supersede National Cooperative Highway Research Program (NCHRP) Report 350: Recommended Procedures for the Safety Performance Evaluation of Highway Features (1993). [14]
Another anecdote contributing to NCHRP's founding comes from the late 1950s when it was noted that 32 state DOTs were researching the same topic without any knowledge of each other’s work. This revelation provided incentive for the states to pool their resources on a national research program addressing common problems.
"NEBS Level 3" is a term from Bellcore special report, SR-3580, and means the equipment meets all of the requirements of GR-63-CORE and GR-1089-CORE. NEBS Level 3 has strict specifications for fire suppression, thermal margin testing, vibration resistance (earthquakes), airflow patterns, acoustic limits, failover and partial operational ...
A new variant of the bird flu has infected a dairy worker in Nevada, marking the state's first human case of the H5N1 avian influenza.. The worker was exposed to the D1.1 strain after working with ...
Sydney, Australia — A shark bit and killed a 17-year-old girl swimming off an eastern Australian island on Monday, officials said, in the country's third reported fatal attack in just over five ...
It necessitates the test of surge immunity in electrical or electronic equipment. IEC 61000-4-5 defines test set-up, procedures, and classification levels. In particular, it standardizes the required surge voltage and current waveforms for laboratory testing, with the "1.2/50-8/20 μs" impulse being the most frequently used surge waveform.
Level 3 Communications, Inc. was an American multinational telecommunications and Internet service provider company headquartered in Broomfield, Colorado. [4] It ultimately became a part of CenturyLink (now Lumen Technologies), where Level 3 President and CEO Jeff Storey was installed as Chief Operating Officer, becoming CEO of CenturyLink one year later in a prearranged succession plan.
The test was pivotal in understanding the fracture problems of ships during World War II. [2] [3] The test was developed around 1900 by S. B. Russell (1898, American) and Georges Charpy (1901, French). [4] The test became known as the Charpy test in the early 1900s due to the technical contributions and standardization efforts by Charpy.