Sentence examples for challenges were posed from inspiring English sources

A few new dye types were introduced in the 20th century, and major challenges were posed by the introduction of synthetic fibres, which held a major share of the world market, and by technological advances.

Additional challenges were posed by the threat – or reality – of police harassment: "It is difficult for us to have groups in my place because when police find out that there is a group of sex workers they can beat us and arrest us".

Particular challenges are posed when such weapons are possessed by states that have used them or threaten to do so.

"In the fall of 2008, fully aware of the need to meet new challenges being posed by the Taliban, we dug into every aspect of Afghanistan policy, assembling a team that repeatedly went into the country, reviewing options and recommendations, and briefing President-elect Obama's team," Mr. Cheney said.

However, greater challenges are posed by growth of layers InN, AlN, and of alloys close to these two binaries in composition.

Further challenges are posed by the fact that the PSA operation is periodic in nature and never attains a true steady state.

On the other hand, computational challenges are posed for existing methods in modeling the interphase interactions and complex boundaries within such three-phase systems.

Aside from the inherent concentration polarization (CP) phenomena, new challenges are posed by the coupled concentrating and dilution effects in the design of FO hollow fiber modules.

When treatment is available in the jail, challenges are posed by the offender's legal status, limited duration of detention, and unpredictable or unexpected release dates (Draine et al. 2010).

As HIV infection in childhood and adolescence has evolved from a terminal to a chronic illness, new challenges are posed for both medical and psychosocial teams serving these clients.

Other significant challenges are posed by a revanchist Russia and an assertive China.