C_{{CH_{4} }}, =,5.24, times,10^{ - 5} cdot left[ {frac{A}{V}, times,HRT} right], +,0.0015 (1)where (C_{{CH_{4} }}) is the mass CH4 emission per unit volume of wastewater (kg/m3), A/V is the surface area to volume ratio of sewer, (m−1) and HRT is wastewater retention time in sewer (h).
The operation of Frank-Read sources of volume density nFR increases the curvature density by 2π times the loop emission rate per unit volume, hence begin{array}{*{20}l} dot{q}_{text{fr}}&= 2pi n_{text{FR}} nu_{text{FR}} = pi vfrac{rho_{text{FR}}}{eta r_{text{FR}}^{2}}.
Also, the acoustic emission energy generated per unit volume of martensite has been found to scale with the change in dislocation density in the formed martensite as the carbon content is varied.
On one hand, the study reveals an upward trend of steel per unit volume of concrete in emission-optimized earth-retaining buttressed walls, compared to the cost-optimized.
Diesel engines are generally more efficient than petrol engines (they have a higher compression ratio, and diesel fuel also contains more energy per unit volume), and they produce lower levels of CO and CO2 emissions per kilometre travelled.
A procedure similar to the one used in positron emission tomography (PET) allowed us to obtain the factor to convert counts per pixel into activity per unit volume.
Levels of energy absorption per unit volume reach 40 MJ/m3 and, per unit mass, 25 J/g.
As a result, both the surface area and micropore volume per unit volume were increased.
