Sentence examples for major difficulties is from inspiring English sources

Certain strains of microalgae have high lipid yields and appear to be good choices for the production of biodiesel, however, one of the major difficulties is the lack of a large-scale cost effective harvesting technique.

As other solar refrigeration systems, even if the cooling demand generally increases with the intensity of the solar radiation, one of the major difficulties is to insure a frigorific power supply when there is no, or low, solar radiation.

One of the major difficulties is that many different mixed models are in existence.

Although ICT is a promising treatment and a minimally invasive procedure, one of the major difficulties is maintaining long-term graft function and insulin independence as a result of the loss of transplanted islets by inflammatory reactions, allogeneic rejection, autoimmune recurrence, and senescence (3).

Two major difficulties are encountered in designing the system.

The major difficulties are caused by the unknown robot system dynamics and the unmeasurable states.

Climate change is a global problem and across the world there are major difficulties being experienced in reducing carbon dioxide (CO2) emissions.

By reviewing development of waste heat utilization in sintering process and sinter cooling process, two major difficulties are more and more apparent.

The major difficulties are caused by simultaneous existence of nonholonomic constraints, unknown system parameters and a quadratic term of unmeasurable states in the mobile robot dynamic system as well as their couplings.

Two major difficulties are the interactions between higher-order statistics of the stimuli and inherent nonlinearities of neural responses [1], [2] and the challenge of estimating receptive fields in high dimensional spaces with limited data [3], [4].

No major difficulties were registered.