enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Perforated metal - Wikipedia

   en.wikipedia.org/wiki/Perforated_metal

   The process of perforating metal sheets has been practiced for over 150 years. In the late 19th century, metal screens were used as an efficient means of separating coal. The first perforators were laborers who would manually punch individual holes into the metal sheet. This proved to be an inefficient and inconsistent method which led to the ...

3. Marston Mat - Wikipedia

   en.wikipedia.org/wiki/Marston_mat

   Sometimes the sheets were welded together. A typical later PSP was the M8 landing mat. A single piece weighed about 66 pounds (30 kg) and was 10 ft (3.0 m) long by 15 in (0.38 m) wide. The hole pattern for the sheet was produced to allow easier transportation by aircraft, since it weighed about two-thirds as much.

4. Corrugated galvanised iron - Wikipedia

   en.wikipedia.org/wiki/Corrugated_galvanised_iron

   Corrugated galvanised iron (CGI) or steel, colloquially corrugated iron (near universal), wriggly tin (taken from UK military slang), pailing (in Caribbean English), corrugated sheet metal (in North America), zinc (in Cyprus and Nigeria) or custom orb / corro sheet (Australia), is a building material composed of sheets of hot-dip galvanised ...

5. Sheet metal - Wikipedia

   en.wikipedia.org/wiki/Sheet_metal

   Sheet metal is available in flat pieces or coiled strips. The coils are formed by running a continuous sheet of metal through a roll slitter. In most of the world, sheet metal thickness is consistently specified in millimeters. In the U.S., the thickness of sheet metal is commonly specified by a traditional, non-linear measure known as its ...

6. Micro perforated plate - Wikipedia

   en.wikipedia.org/wiki/Micro_perforated_plate

   One early contributor to the theory of micro perforated plates as sound absorbers was Professor Daa-You Maa. [1] [2] Further possibilities aiming to improve the accuracy of Maa's original model are currently being investigated. One other major phenomenon that currently being investigated is the nonlinear effect i.e. an MPP behaves differently ...

7. Aluminium foil - Wikipedia

   en.wikipedia.org/wiki/Aluminium_foil

   Although aluminium is non-magnetic, it is a good conductor, so even a thin sheet reflects almost all of an incident electric wave. At frequencies more than 100 MHz, the transmitted electric field is attenuated by more than 80 decibels (dB), that is less than 10 −8 = 0.00000001 of the power gets through.