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211. The regio - selectivity depends greatly on the type of bases used and the reaction time.

212. S - PPESK showed high catalytic activity and excellent dimerization selectivity under low reaction temperature conditions.

213. Cyclon micro bubble flotation column is a new type and highly efficient equipment for fine ore separation. It can accomplish roughing cleaning and scavenging in one pass and has good selectivity.

214. And ammonia had effective selectivity for the separation of potassium nitrate.

215. In the catalytic systems for ethylene oligomerization, different organo-aluminum compounds significantly influence the activity and selectivity of the catalysts.

216. The results showed that selectivity and stability of the catalyst were greatly enhanced and yield of cumene was increased after the modification.

217. Based on the thermodynamics of swelling gel, factors affecting solute partition and deswelling of gel, which determine the selectivity and the capacity of gel extraction respectively, are analyzed.

218. Admixture of a SiO 2 carrier, however, decreases the propene selectivity somewhat.

219. The reason for selectivity lies mainly in the violation of pragmatic principle for interrogative mood.

220. The mesh size selectivity can be expressed by logistic or Richards equation.

221. Objective To investigate if a bacterial enhancer-like element (BELE) in the upstream region of Escherichia coli gln Ap2 gene had strict promoter selectivity.

222. Orthogonal Multi-Carrier Modulation(OMCM) is adopted to overcome the frequency selectivity and time variation of low-voltage power line channel.

223. This research optimized the process conditions for the synthesis of neopentyl glycol by a serial of orthogonal experiments and improved the selectivity and conversion.

224. Selectivity of human migration long been the focus of demographers and economists.

225. The quasi-elliptic function filter with one transmission zero has the better selectivity than the general Chebyshev filter.

226. Immobilized metalloporphyrins avoid to form dimerization and have high stability, activity and shape and size selectivity.

227. Incorporating the existing selectivity estimation techniques, a new selectivity estimation method for the distance join based on Minkowski sum and histogram is proposed.

228. Apart from light alkenes, CO prevailed in the produced COX while the selectivity to CO2 was always below 1 %, so the efficient utilization of carbon resources in the GOC process is high.

229. This biosensor has the advantage of high selectivity, sensitivity and short response time.

230. Since the work of Hubel and Wiesel, it is generally accepted that visual orientation and direction selectivity are achieved by processes in the visual cortex in the higher mammals.

231. The Zn modified catalyst has not improve the selectivity of catalyst for thiophene in model gasoline containing octene . Sentencedict.com

232. The constraint index for shape selectivity of zeolite catalyst of ZSM type has been determined by means of gas chromatography in connection with a continuous flow micro-reactor under normal pressure.

233. A high flow rate and pressure of hydrogen was in favor of the catalytic reduction of nitrate, but not benefit for the selectivity.

234. The attenuation poles will improve the selectivity of the diplexer and can be obtained by modifying the traditional Chebyshev frequency response.

235. It is concluded that the index bears good structural selectivity and relativity.

236. The result showed proper reaction temperature, catalyst to oil ratio and short reaction time may detriment thermal cracking reaction, hydrogen transfer reactions, and get high propylene selectivity.

237. Galvani cell gas sensor was made of electrolyte such as H2SO4 and electrodes such as Pt film and PtO film. It has high sensitivity and excellent selectivity to H2 and CO.

238. The selectivity is related to the porous structure and acid strength of the catalyst.

239. In this paper, two building blocks of cross coupling pseudoelliptic filter are cascaded to get high selectivity of filter characteristic.

240. Advantageous in high activity, good selectivity and long operation cycle, the C_2 hydrogenation isothermal reactor ER-424A/B has a unique hydrogenation effect.