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LiHMDS is often used in organic chemistry as a strong non-nucleophilic base. [3] Its conjugate acid has a pK a of ~26, [4] making it is less basic than other lithium bases, such as LDA (pK a of conjugate acid ~36).
Phase 5 of Discovery introduced updated versions of the Zul'Gurub and Blackwing Lair raids, as well as the new raid Crystal Vale. A new boss was also added to the Demon Fall Canyon dungeon from Phase 4. Phase 6 of Discovery added the "48-Hour War" event leading to the opening of the Ruins of Ahn'Qiraj and Temple of Ahn'Qiraj raids. Ruins was ...
Initially, the hypothesis boosting problem simply referred to the process of turning a weak learner into a strong learner. [3] Algorithms that achieve this quickly became known as "boosting". Freund and Schapire's arcing (Adapt[at]ive Resampling and Combining), [ 7 ] as a general technique, is more or less synonymous with boosting.
In acid–base extraction, the efficiency of extraction of a compound into an organic phase, such as an ether, can be optimised by adjusting the pH of the aqueous phase using an appropriate buffer. At the optimum pH, the concentration of the electrically neutral species is maximised; such a species is more soluble in organic solvents having a ...
Druids frequently follow this dedication to balance and, under Advanced Dungeons & Dragons rules, were required to be this alignment. In an example given in the 2nd Edition Player's Handbook, a typical druid might fight against a band of marauding gnolls, only to switch sides to save the gnolls' clan from being totally exterminated. Examples of ...
Telephone exchanges often have arrays of batteries in their basements to power equipment [2] and in the past metro systems such as the London Underground had their own power stations, [3] not only giving some redundancy but also using the grid for load balancing. Today these supplies often have been replaced by direct supply from the grid and ...
A cosmological phase transition is an overall change in the state of matter across the whole universe. The success of the Big Bang model led researchers to conjecture possible cosmological phase transitions taking place in the very early universe, at a time when it was much hotter and denser than today. [1] [2]