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271. Uneven distribution of drill lixiviant for stope leaching was solved by adopting micro-irrigation technology.

272. For minimized seller's total expected loss and seasonal products, the paper proposes an optimal pricing model that is solved by Particle Swarm Optimization(PSO).

273. The energy equations of the oil film and the bush are solved simultaneously by using an efficient finite difference scheme.

274. Through the analysis of the movement process of S-twist yarn unwound on the surface of the bobbin, the article has solved end-breakage and raveling problems when the yarn is unwound.

275. The standards of Web Service solved interoperability puzzles among heterogeneous information systems.

276. Problems of corrosiveness of gas dispersoid have been solved effectively through optimizing formula design and set off testing. Application limits of gas dispersoid has been expanded.

277. By observing the network,(www.Sentencedict.com) the admittance matrix is written directly and thus circuit can be solved.

278. This design solved the problem that ground point of DC system can't be automatically detected in our country.

279. Experimental data shows that link failure can be solved and new route found by MPLS-based DiffServe network.

280. Building block model is the key problem that should be solved in mine 3D calculation of reserves.