Rigid gate

The first type of gate is called a rigid gate where all necessary criteria must be passed in order to continue the project. Indeed, it is possible in the case of a rigid gate that the failure to reach even a single threshold could derail a new project. 

The first observation consists merely of an alternative but natural interpretation of the presence or absence of balls the movement of balls is equated with the communication of binary signals. Once this interpretation is made, the second observation also becomes a natural one wherever balls collide, either among themselves or with some collection of rigid mirrors, the effect of the collision may be viewed as a Boolean logic gate. 

The standard formalisms for describing ET processes assume that in reactions such as Eqs. (1) and (2) there is but a single stable conformational form for each of the precursor and successor electron-transfer states. However, for a system that displays two (or more) alternative stable conformations with different ET rates, dynamic conformational equilibrium can modulate the ET rates. Major protein conformational changes can occur at rates that are competitive with observed rates of ET [9], and such gating [10] may occur in non-rigid complexes such as that between zinc cytochrome c peroxidase (ZnCcP) and cytochrome c (see below) or even within cytochrome c [5]. 

Similar to higher organisms combining muscles with skeletons to attain mobility, the addition of flexible organic functionalities to the rigid mesoporous silica structures enables the formation of gated systems. Organic species can be covalently attached to silica with relative ease. The main sources for the functionalization of silica are... 

The main considerations in mold design effecting product shrinkage are to provide, for instance, with IM of RTPs, adequate cooling, proper gate size and location, and structural rigidity. Of these three, cooling conditions is the most critical, especially for crystalline TPs. 

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