Due to the hierarchical nanostructures, the enhanced number of active sites, improved electron conductivity and mass transport of the geometric constraint, the material shows high current density, low overpotential, and excellent anti-aggregation behaviors over a wide pH range (0 14) in HER.
Liberated from the physical constraints of the material world, cartoon characters are free to defy gravity or to perform miracles at the animator's behest.
This proceeds by identifying the constraints that the material must meet and the objectives that the design must fulfill.
On the other hand, the manufacturing constraints of the material distribution in the machining directions of stiffeners are implemented by an improved piecewise interpolation based on a beveled cut-surface.
Concrete scaling is caused by the formation of an ice lens, which induces constraints on the material periphery.
These forms of distribution seem to imply experiences free from the constraints of the material world, but in fact, the experiences are highly shaped by the reception devices through which users come in contact with the transmitted information.
The main constraints define the material balance for each country and product: The quantity imported plus the domestic supply and the manufactured quantity must equal the domestic demand plus the quantity used in manufacturing other products and exports.
Poverty imposes constraints on the material conditions of everyday life, by limiting access to the fundamental building blocks of health such as adequate housing, good nutrition and the opportunity to maintain optimal personal hygiene [ 2, 4].
In this process, the heated polymer billet is deformed in a channel formed in the circumference of the bottom roll that provides lateral constraint to the material as it deforms.
Taking the static and dynamic performance as objective function, the light weight as constraint and the material density or the feature size as optimization variables, the mathematical optimization model is established.
