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In 1941, the Hilti company Maschinenbau Hilti OHG was founded by Martin (1915–1997) and Eugen Hilti (1911–1964), [3] with the opening of a mechanical workshop in Schaan, Liechtenstein. Martin Hilti was trained in mechanical engineering and automotive design at the Wismar Engineering College and was 26 at the time of founding the company.
Ramset powder-actuated tool. A powder-actuated tool (PAT, often generically called a Hilti gun or a Ramset gun after their manufacturing companies) is a type of nail gun used in construction and manufacturing to join materials to hard substrates such as steel and concrete.
The Houston Heights, one of the earliest planned communities in Texas, is located 4 miles (6.4 km) northwest of Downtown Houston.A National Geographic article says "stroll the area's broad, tree-canopied esplanades and side streets dotted with homes dating from the early 1900s and you may think you've landed in a small town."
The first vibrational mode corresponds to the lowest natural frequency. Higher modes of vibration correspond to higher natural frequencies. Often when considering rotating shafts, only the first natural frequency is needed. There are two main methods used to calculate critical speed—the Rayleigh–Ritz method and Dunkerley's method. Both ...
Typical values of ground vibration particle velocity associated with vehicles passing over traffic calming road humps are in the range of 0.1 – 2 mm/s. Magnitudes of ground vibrations that are considered to be able to cause structural damage to buildings are above 10–20 mm/s.
One version of the story has Tesla experimenting with a small version of his mechanical oscillator at his laboratory on 46 East Houston Street near the Manhattan neighborhood of SoHo. Tesla said the oscillator was around 7 inches (18 cm) long and weighing 1 or 2 pounds (450 or 910 g), something "you could put in your overcoat pocket".
Random vibration testing is one of the more common types of vibration testing services performed by vibration test labs. Some of the more common random vibration test standards are MIL-STD-810, RTCA DO-160, and IEC 60068-2-64.
Magnetic field strength (from lower to higher orders of magnitude) Factor (tesla) SI name SI Value CGS. Value Example of magnetic field strength 10 −18 T attotesla 1 aT: 10 fG: 5 aT: 50 fG: Sensitivity of Gravity Probe B gyroscope's "SQUID" magnetometer (most sensitive when averaged over days) [3] 10 −17 T 10 aT: 100 fG: 10 −16 T 100 aT ...