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The dredge Kaptajn Nielsen overturned without warning in Moreton Bay, trapping crew below deck in 35 feet (11 m) of water. Volunteer diver Engwirda and water police officer Ivan Adams immediately dived into the murky water and rescued twelve survivors, and some deceased persons.
Inserts are pins, bolts, screws, joints and other structures that are used to transfer localized loads to a composite panel or to join two composite panels together. Metallic inserts are commonly used in the aerospace and marine industries to attach objects to sandwich composite panels.
A Nielsen transformation is a finite composition of elementary Nielsen transformations. Since automorphisms of F n {\displaystyle F_{n}} are determined by the image of a basis, the elementary Nielsen transformations correspond to a finite subset of the automorphism group A u t ( F n ) {\textstyle \mathrm {Aut} (F_{n})} , which is in fact a ...
The concept behind the Bradbury–Nielsen shutter is to apply a high frequency voltage in a 180° out-of-phase manner to alternate wires in a grid which is orthogonal to the path of the ion beam. This results in charged particles only passing directly through the shutter at certain times in the voltage phase (φ=nπ/2), when the potential ...
Maloy stood by to transfer personnel, and Nelson was taken in tow. Twenty-four of her crew were killed or missing and nine wounded. Twenty-four of her crew were killed or missing and nine wounded. After emergency repairs at Derry , Northern Ireland, where her #2 turret and torpedo tubes were removed as a weight saving/stability measure, the ...
Tapcon screws are a popular anchor that stands for self tapping (self threading) concrete screw. Larger diameter screws are referred to as LDT's. This type of fastener requires a pre-drilled hole—using a Tapcon drillbit—and are then screwed into the hole using a standard hex or phillips bit. These screws are often blue, white, or stainless ...