Variable expenses are costs that change over time. Fixed expenses typically stay the same and can be easier to plan for. Many, or all, of the products featured on this page are from our advertising ...

Conventional wastegate equipped turbochargers suffer from narrow effective engine power speed range. Their turbines must be sized for either low speed response or high speed horsepower. Variable ...

Although quality is often measured by the joint level of several correlated random variables, it is common to find in practice, control decisions based on individual ...