Nacre, also known as mother of pearl is a composite, organic-inorganic material produced in nature in the inner shell layer of molluscs and the outer coating of pearls. The material is resilient and iridescent with high strength ...
(PhysOrg.com) -- Imagine a platoon of soldiers fighting in a hazardous urban environment who carry personal digital assistants that can display the location of enemy shooters in three dimensions and accurately identify the ...
Engineering
Mar 24, 2009
8
0
Scientists at the University of California Santa Barbara, HRL Laboratories LLC, and the U.S. Army Research Laboratory have developed elastic microlattice pads that can withstand both single hits and a series of impacts better ...
Materials Science
Nov 27, 2019
2
201
Habitat destruction results in wildlife populations that are small, made up of relatives, and have low genetic variation.
Plants & Animals
Aug 1, 2019
0
17
New research has shown that honeycomb "cellular" materials made of a shape-memory polymer might be programmed for specific purposes, from shock-absorbing football helmets to biomedical implants.
Materials Science
Nov 29, 2016
0
1061
Stanford bioengineer David Camarillo knows all too well that bicycling is the leading cause of sports- and activity-related concussion and brain injury in the United States. He's had two concussions as the result of bicycling ...
Engineering
Oct 4, 2016
1
1
To look tougher, a weakling might shave their head and don a black leather jacket, combat boots and a scowl that tells the world, "don't mess with me."
Plants & Animals
Aug 25, 2015
1
77
An entrepreneur whose Eureka moment came at last year's wet and windy Grand National has reinvented the umbrella with the help of WMG at the University of Warwick.
Engineering
May 10, 2013
13
0
Biomechanics researchers Timothy Higham of Clemson University and Andrew Clark of the College of Charleston conclude that moving quickly in a forward, firm-footed stance across a slippery surface is less likely to lead to ...
Other
Mar 24, 2011
0
0
The latest accessory for cyclists comes in the form of an inflatable airbag -- for the head. A Stockholm-based industrial duo by the names of Terese Alstin and Anna Haupt have developed a solution for those struggling with ...
A helmet is a form of protective gear worn on the head to protect it from injuries.
Ceremonial or symbolic helmets (e.g., English policeman's helmet) without protective function are sometimes used. The oldest known use of helmets was by Assyrian soldiers in 900BC, who wore thick leather or bronze helmets to protect the head from blunt object and sword blows and arrow strikes in combat. Soldiers still wear helmets, now often made from lightweight plastic materials.
In civilian life, helmets are used for recreational activities and sports (e.g., jockeys in horse racing, American football, ice hockey, cricket, baseball, and rock climbing); dangerous work activities (e.g., construction, mining, riot police); and transportation (e.g., Motorcycle helmets and bicycle helmets). Since the 1990s, most helmets are made from resin or plastic, which may be reinforced with fibers such as aramids.
This text uses material from Wikipedia, licensed under CC BY-SA
