Sentence examples for it was often required from inspiring English sources

Once a producer sold gas from a field to a pipeline, it was often required to sell that gas to only that pipeline for decades, until the field coughed up its last molecules.

For these applications, it is often required that the gels degrade under physiological conditions.

It is often required that these feedback controllers satisfy some specified criterion.

It is often required to compute the dynamic flexibility matrix [Z], which is the inversion of [D].

In spaceframe manufacturing, it is often required to join tubular parts with different cross sectional shapes and different materials.

However, to succeed with transdermal drug delivery it is often required to overcome the low permeability of the upper layer of the skin, the stratum corneum (SC).

In geographical epidemiology it is often required to produce a map of the risk of disease over a study region, a disease map.

In many practical engineering applications, it is often required to measure the similarity of two signals to gain insight into the conditions of a system.

When designing stable networks, it is often required to know the structure of networks attaining the maximum and minimum values of given stability parameters with prescribed number of communications stations and links.

In atmospheric aerosol studies, it is often required to use two different impactors, namely, the normal pressure and the low-pressure impactor, to measure the mass-size distribution over a wide size range.

In the reliability-based design of engineering systems, it is often required to evaluate the failure probability for different values of distribution parameters involved in the specification of design configuration.