Some articles on material, materials:

Wide Bandgap Semiconductors - Material Properties - Bandgap
... The magnitude of the coulombic potential determines the bandgap of a material, and the size of atoms and electronegativities are two factors that determine the bandgap ... Materials with small atoms and strong, electronegative atomic bonds are associated with wide bandgaps ... Most wide bandgap materials are associated with a direct bandgap, with SiC and GaP as exceptions ...
Organic Field-effect Transistor - Materials
... One common feature of OFET materials is the inclusion of an aromatic or otherwise conjugated π-electron system, facilitating the delocalization of orbital wavefunctions ... OFETs employing many aromatic and conjugated materials as the active semiconducting layer have been reported, including small molecules such as rubrene, tetracene, pentacene ... Many review articles exist documenting the development of these materials ...
Drill Bit - Characteristics - Materials
... Many different materials are used for or on drill bits, depending on the required application ... Many hard materials, such as carbides, are much more brittle than steel, and are far more subject to breaking, particularly if the drill is not held at a very constant angle to the workpiece ... the properties conferred by hardening and tempering the material ...
Obscene Publications Act 1959 - Impact and Assessment
... operations where the police purchased "obscene" materials were not considered sufficient evidence of publication, since the police were not considered easy to "corrupt ... Secondly, the offer of such materials for sale was not held to be publication, since it was merely an invitation to treat ... articles for publication or sale" and also extended "obscene materials" to cover photograph negatives ...
Bow (music) - Materials and Manufacture
... bow consists of a specially shaped stick with other material forming a ribbon stretched between its ends, which is used to stroke the string and create sound ... Part of the bowmaker's skill is the ability to choose high quality material for the stick ... export is regulated by international treaty, so makers are currently adopting other materials woods such as Ipê (Tabebuia) as well as synthetic materials ...

Famous quotes containing the word materials:

    Young children learn in a different manner from that of older children and adults, yet we can teach them many things if we adapt our materials and mode of instruction to their level of ability. But we miseducate young children when we assume that their learning abilities are comparable to those of older children and that they can be taught with materials and with the same instructional procedures appropriate to school-age children.
    David Elkind (20th century)

    If our entertainment culture seems debased and unsatisfying, the hope is that our children will create something of greater worth. But it is as if we expect them to create out of nothing, like God, for the encouragement of creativity is in the popular mind, opposed to instruction. There is little sense that creativity must grow out of tradition, even when it is critical of that tradition, and children are scarcely being given the materials on which their creativity could work
    C. John Sommerville (20th century)

    Though the hen should sit all day, she could lay only one egg, and, besides, would not have picked up materials for another.
    Henry David Thoreau (1817–1862)