Aside from such typical economic concerns as raw material and maintenance costs and durability, storage technologies all face some losses in "round-trip efficiency".
Diesel engine is widely used in underground mining machines due to its efficiency, ease of maintenance, reliability and durability.
For underground mines, self-propelled diesel equipment is preferred due to its high fuel efficiency, ease of maintenance, reliability and durability.
The instrument choice is a compromise between performance characteristics, ruggedness and durability, maintenance requirements and purchase cost.
More importantly, ultrasound is a "sustainable technology" for developing and impoverished nations because of its relatively low cost of purchase, low cost for maintenance and supplies, portability, and durability in comparison with all other imaging modalities [47].
The "new generation" program was headed in 1984 by the 580 mm bore/640 mm stroke L58/64 series, whose designers sought a high overall operating economy, reliability, ease of maintenance, component durability and unrestricted heavy fuel compatibility.
The challenges for widespread use of water electrolysis are to reduce energy consumption, cost and maintenance and to increase reliability, durability and safety.
The paradox of great longevity in this 'short-lived' tree species is explained by slow growth that minimizes maintenance and repair costs while maximizing durability and strength, combined with an internal architecture that creates functionally independent units within each tree.
In addition to the efficiency improvements, the needs for reduction in equipment and maintenance costs, and improvement in reliability and durability are also established.
