The phrase "a material has been" is correct and usable in written English.
It can be used when discussing the state or condition of a material in a passive construction, often in scientific or technical contexts.
Example: "A material has been tested for its durability under extreme conditions."
Alternatives: "a material is" or "a material was".
Recently, a new method for determining crack closure properties of a material has been presented.
Stress investigation on the problem of a subsurface Zener Stroh crack inclined to the free surface of a material has been carried out.
This chapter discusses a case study where a material has been chosen that has no natural dense phase conveying capability and so can only be conveyed in dilute phase suspension flow in a conventional pneumatic conveying system.
Such a material has been chosen due to its very low yield strength (about 20 MPa after heat treatment), high hardening ratio (about 4) and large ductility (about 40%).
In some chromophores the absence of a bridge (D-A+) between the donor and acceptor fragments enhances the NLO properties and the single crystal structure of such a material has been determined by X-ray diffraction.
Once a material has been chosen and a prototype stent is made, extensive in vitro testing of the stent is performed.
Although many switching materials have been reported for the RRAM applications, the Al2O3 as a switching material has been reported a few [6 9].
QCT, now as a starting material, has been used to synthesize a variety of biologically active compounds, most notably the inositol, as listed in Table 2.
Coupling conductive polymers to a carbon material has been proven to be an effective approach to overcome this problem [8, 9].
Its drawback, as a building material, has been its inability to withstand a similar amount of tensile stress which is pulling or stretching.
The potential application of tungsten as a structural material has been strongly restricted by inherent brittleness.
