منابع مشابه
Radical reductions of alkyl halides bearing electron withdrawing groups with N-heterocyclic carbene boranes.
1,3-Dimethylimidazol-2-ylidene borane and 2,4-dimethyl-1,2,4-triazol-3-ylidene borane are found to be useful reagents for the reduction of alkyl iodides and bromides bearing nearby electron withdrawing substituents. Signatures of radical chain reactions are seen in many cases, but ionic reductions may also be occurring with some substrates. The reagents are attractive because of their low molec...
متن کاملCryptographic reductions
One of the main tools of cryptography are reductions. The simplest way to prove the security of a complex scheme based on the security of its constituents is to prove that if there exists an adversary that breaks the complex scheme then we can construct an adversary that breaks at least one of the constituent primitives. Since the security of the primitive is taken as a premise, this gives a co...
متن کاملBounded Reductions
We study properties of resource{ and otherwise bounded reductions and corresponding completeness notions on nondeterministic time classes which contain exponential time. As it turns out, most of these reductions can be separated in the sense that their corresponding completeness notions are diierent. There is one notable exception. On nondeterministic exponential time, 1-truth table and many-on...
متن کاملLocal Reductions
We reduce non-deterministic time T ≥ 2n to a 3SAT instance φ of size |φ| = T · log T such that there is an explicit circuit C that on input an index i of log |φ| bits outputs the ith clause, and each output bit of C depends on O(1) inputs bits. The previous best result was C in NC1. Even in the simpler setting of |φ| = poly(T ) the previous best result was C in AC0. More generally, for any time...
متن کاملChemical Reductions Do Not Necessarily Lead to Computational Reductions
The comparison of solutions of the shock-ignition of a hydrogen bubble in air using detailed and reduced chemical mechanisms is presented. The reduced chemical kinetics mechanism with 9 species and 12 irreversible reactions is obtained using the G-Scheme. The test shows that the simulation becomes computationally more expensive using the reduced mechanism.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature Climate Change
سال: 2007
ISSN: 1758-678X,1758-6798
DOI: 10.1038/climate.2007.19