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An example of this device is shown in the figure on the right; it had a 0.125-inch-diameter (3.2 mm) hole, was 1.9 in (48 mm) long, and 0.8 in (20 mm) in diameter. The quarter-wave resonance was calculated to be 1780 Hz, while the measured fundamental was 1625 Hz with detectable second and third harmonics.
A wingspan that can span 6 feet. The sandhill crane is a symbol of changing seasons in New Mexico, and the scientific questions left to be answered about the bird are nearly boundless.
A tower crane is usually assembled by a telescopic jib (mobile) crane of greater reach (also see "self-erecting crane" below) and in the case of tower cranes that have risen while constructing very tall skyscrapers, a smaller crane (or derrick) will often be lifted to the roof of the completed tower to dismantle the tower crane afterwards ...
The concept that matter behaves like a wave was proposed by French physicist Louis de Broglie (/ d ə ˈ b r ɔɪ /) in 1924, and so matter waves are also known as de Broglie waves. The de Broglie wavelength is the wavelength , λ , associated with a particle with momentum p through the Planck constant , h : λ = h p . {\displaystyle \lambda ...
The main principle in PHC is to store the energy from the external forces influencing the system and dissipate them or reapply them later.Shock absorbers or drill string compensators are simple forms of PHC, so simple that they are normally named heave compensators, while "passive" is used about more sophisticated hydraulic or mechanical systems.
AHC winches are used in ROV-systems and for lifting equipment that is to operate near or at the seabed. [3] Active compensation can include tension control, aiming to keep wire tension at a certain level while operating in waves. Guide-wires, used to guide a load to an underwater position, may use AHC and tension control in combination.
The external lewis was originally shaped like a pair of scissor-tongs, and swung from a treadwheel crane. [3] This type of tong device has been known as dogs and the holes in the stone as dog holes for many centuries. Many old bridges and walls in the UK still have dog holes to reveal how the stones were lifted, particularly onto bridge ...
From ancient history to the modern day, the clitoris has been discredited, dismissed and deleted -- and women's pleasure has often been left out of the conversation entirely. Now, an underground art movement led by artist Sophia Wallace is emerging across the globe to challenge the lies, question the myths and rewrite the rules around sex and the female body.