نتایج جستجو برای: free addition
تعداد نتایج: 1186203 فیلتر نتایج به سال:
Effects of elements addition on superconductivity of rare-earth-element-free high Tc superconductor.
It turns out that there exists a surprising connection between certain ideas from the areas listed in the title. In this announcement we try to briefly outline the connection and to state our principal results. Very roughly, we use concepts from formal language theory, group theory, and the theory of ends to investigate a class of graphs which we call context-free graphs. Using the results obta...
We look at 1-region membrane computing systems which only use rules of the form Ca! Cv, where C is a catalyst, a is a noncatalyst, and v is a (possibly null) string of noncatalysts. There are no rules of the form a ! v. Thus, we can think of these systems as “purely” catalytic. We consider two types: (1) when the initial configuration contains only one catalyst, and (2) when the initial configu...
An environmentally benign, fast and convenient protocol has been developed for the Michael addition of 1,3-dicarbonyl compounds to β-nitroalkenes in good to excellent yields by a grinding method under catalyst- and solvent-free conditions.
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