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prevent the formation
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  “prevent the formation”译为未确定词的双语例句
     ②selectivity prevent the formation of ECM by HSC.
     ②选择性阻止HSC合成ECM;
短句来源
     Crystallization process of Co-Ti substituted M-type barium ferrite nanoparticles was investigated by XRD and TEM. The results show that the pretreatment method through coprecipitation process to eliminate Cl- anions in the citrate sol of BaCoTiFe10O19 can not only greatly improve the stability of the sol but also completely prevent the formation of α-Fe2O3 and BaFe2O4 during the whole crystallization of BaCoTiFe10O19 nanopartilces.
     XRD和TEM对BaCoTiFe10O19纳米粒子的结晶过程研究表明:采用共沉淀预处理方法消除溶胶中的Cl-离子,不仅可以显著提高柠檬酸盐溶胶的稳定性,而且阻止BaCoTiFe10O19纳米粒子结晶过程中α-Fe2O3和BaFe2O4中间相的形成;
短句来源
     Crystallization process of Co-Ti substituted M-type barium ferrite nanoparticles was investigated by XRD and TEM. The results show that the pretreatment method through coprecipitation process to eliminate Cl-anions in the citrate sol of BaCoTiFe10O19 can not only greatly improve the stability of the sol but also completely prevent the formation of α-Fe2O3 and BaFe2O4 during the whole crystallization of BaCoTiFe10O19 nanopartilces.
     XRD和TEM对BaCoTiFe10O19纳米粒子的结晶过程研究表明:采用共沉淀预处理方法消除溶胶中的Cl-离子,不仅可以显著提高柠檬酸盐溶胶的稳定性,而且阻止BaCoTiFe10O19纳米粒子结晶过程中α-Fe2O3和BaFe2O4中间相的形成;
     Large amount of sodium nitrite (6900 mg/kg) could significantly prevent the generation of 3-methylbutanal, 2-Butanone, dimethyl disulfide and 3-(methylthio)-propanal (P<0.05), and absolutely prevent the formation of 2-methyl-2-butenal.
     高浓度(6900mg/kg)亚硝酸钠可以显著抑制3-甲基丁醛、2-丁酮、二甲基二硫化物和3-甲基硫代丙醛的生成(P<0.05),并完全抑制2-甲基-2-丁烯醛的生成;
短句来源
     Conclusion Both Kv1.3 and Kir2.1 channels play a critical role in differentiation of macrophages into foam cells and blockage of corresponding potassium channels would prevent the formation of the foam cells.
     结论:Kv1.3和Kir2.1对泡沫细胞的分化均起关键作用,特异性阻断后能够抑制人单核细胞源性巨噬细胞向泡沫细胞分化。
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     How to prevent it?
     如何有效地遏制腐败现象 ?
短句来源
     prevent shock;
     防止休克发生;
短句来源
     Prevent the particle from polluting;
     防止微粒污染;
短句来源
     Prevent the Transmission of HIV in the Environment
     预防医疗环境中HIV病毒的传播
短句来源
     formation;
     评价的形成性问题;
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  prevent the formation
These membranes proved to be the most efficient in the filtration of natural surface water in a noncontinuous regime, a result that is explained by the ability of membranes to prevent the formation of a fouling biofilm on their surfaces.
      
An increase in the pH of irradiated solutions up to pH ≥ 9 was found not only to prevent the formation of methyl iodide but also to enhance its radiation-chemical degradation.
      
It is expected that the development of bubbles should prevent the formation of "pockets" at the flame front, similar to those predicted by a simplified model of turbulent combustion in a constant density flux.
      
The results of the study suggest that a mobility value lower than 106 cm2/V s does not prevent the formation of zero-resistance states in a magnetic field in a two-dimensional system under the effect of microwave radiation.
      
A model explaining the occurrence of recording delay time (dead zone) by the presence of oxygen or other impurities that prevent the formation of free radicals is put forward.
      
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The formation of Widmanst(a|¨)tten structure of alpha iron in hypoeutectoidsteels was investigated in 0.27,0.40,0.52 and 0.60% carbon steels.Specimenswere heated to 860° and 1240℃ in vacuo and cooled at different rates to roomtemperature or isothermally treated at various temperatures between 650° and750℃ in vacuo.It was shown that the Widmanst(a|¨)tten structure of alpha ironproduced in 0.27,0.40 and 0.52% carbon steels was always accompanied by asurface relief of the type associated with bainite transformation.The...

The formation of Widmanst(a|¨)tten structure of alpha iron in hypoeutectoidsteels was investigated in 0.27,0.40,0.52 and 0.60% carbon steels.Specimenswere heated to 860° and 1240℃ in vacuo and cooled at different rates to roomtemperature or isothermally treated at various temperatures between 650° and750℃ in vacuo.It was shown that the Widmanst(a|¨)tten structure of alpha ironproduced in 0.27,0.40 and 0.52% carbon steels was always accompanied by asurface relief of the type associated with bainite transformation.The surfacerelief was not observed when conditions were not favourable for the productionof Widmanst(a|¨)tten structure.The effects of various factors on the formation of Widmanst(a|¨)tten structure ofalpha iron are discussed.It is suggested that the absence of Widmanst(a|¨)ttenstructure in slowly cooled specimens,and in specimens with fine austenitic grains,is due to the formation of grain boundary ferrite,which enriches the remainingaustenite with carbon,thereby prevents the formation of carbon-free bainite.The experimental results showed that austenite may decompose by bainitetransformation at temperatures as high as 750℃.

试验证明亚共析钢中魏氏组织的α铁系以贝茵体型相变的机构形成,相当于无碳贝茵体。奥氏体晶粒尺度、碳含量、温度以及冷却速度对魏氏组织的影响都很容易根据贝茵体形成机构的理论加以解释。

Miracil D is effective against Schistomia Mansoni,but is ineffective against SchistosomaJaponica.The present communication deals with the preparation of seventeen new compoundsof the hydrochlorides of 3-dialkylaminomethyl-thiochromanones including its 7-chloro-and 7-methoxy-derivatives,which are related to Miracil D in structure.Those compounds were prepared by means of the Mannich reaction from the correspondingthiochromanone,amine and paraformaldehyde.Besides the hydrochloride of the Mannich base,tar-like...

Miracil D is effective against Schistomia Mansoni,but is ineffective against SchistosomaJaponica.The present communication deals with the preparation of seventeen new compoundsof the hydrochlorides of 3-dialkylaminomethyl-thiochromanones including its 7-chloro-and 7-methoxy-derivatives,which are related to Miracil D in structure.Those compounds were prepared by means of the Mannich reaction from the correspondingthiochromanone,amine and paraformaldehyde.Besides the hydrochloride of the Mannich base,tar-like substance was also obtained as the by-product of the reaction.It was found that theaddition of few drops of alcoholic hydrochloride solution could prevent the formation of the tar-like substance and thus increase the yield of the hydrochloride of the Mannich base.All the products,especially the 7-chloro-derivatives,were unstable in aqueous solution onstanding for several hours; but they were stable even on boiling if a few drops of dilute hydro-chloric acid solution were added.The physical and chemical properties of the decompositionproduct in aqueous solution and those of the above mentioned tar-like substance were identicalfor the same thiochromanone.It was probably a dimer of the corresponding 3-methylene-thio-chromanone.

本文制备了十七种3-二烃氨基甲基-苯并硫六圜-4-酮盐酸盐的衍生物。这些化合物是用相当的酮、胺类盐酸盐与聚甲醛进行 Mannich 反应制得。在反应中,氢离子可以抑制 Mannich 碱的分解。

The influence of various factors on the aging embrittlement of Cr-Mn-N austenitic heat-resisting steels strengthened with Mo, V and B have been studied. It is shown that there are three factors controlling the aging embrittlement. (1) Loss of ductility is accompanied by fine precipitation of carbide and nitride along the grain boundaries. With increasing C and N content, the ductility of the aged steel is dropped sharply. The time-temperature-iso-impact values curves are in form of double C shape. The noses...

The influence of various factors on the aging embrittlement of Cr-Mn-N austenitic heat-resisting steels strengthened with Mo, V and B have been studied. It is shown that there are three factors controlling the aging embrittlement. (1) Loss of ductility is accompanied by fine precipitation of carbide and nitride along the grain boundaries. With increasing C and N content, the ductility of the aged steel is dropped sharply. The time-temperature-iso-impact values curves are in form of double C shape. The noses of the curves may possibly be related to the precipitation of carbide and X phase. (2) Strengthening elements such as Mo and B tend to segregate at grain boundaries. The effect of B in steel is to prevent the formation of the continuous fine precipitation film along grain boundaries, thus the aging embrittlement is minimized. Segregation of Mo along grain boundaries promotes brittlement. (3) After aging at temperature interval between 600—850℃ for a long time, austenite will become less stable due to the precipitation of carbide and nitride as M_(23)C_6 and (Cr, Fe)_2N of the solid solution. Thus the diffusionless transformation such as γ→s→α' or γ→α' can easily occur when shock load is applied, and therefore the aged specimens will show low ductility at temperature of testing.

Cr-Mn-N奥氏体耐热钢在时效过程中有变脆的倾向,可能成为高溫长期使用的障碍.本文研究了下列三方面变脆的影响因素:(1)碳和氮含量的增加,促进时效变脆,硼防止时效变脆的作用随C+N含量的增加而減弱.在时间-溫度-等冲击值曲线上出现双C形式,它们与碳氮化物的析出和χ相生成有关.(2)碳、硼及钼等元素在晶界有偏聚现象.碳、钼等元素的偏聚促进沿晶界碳化物析出,加速钢的变脆.硼则有延缓晶界碳化物析出的作用,抑制时效脆性.(3)在长期时效过程中,碳氮化物及中间相的析出引起基体合金元素的贫化,从而降低γ相的稳定性,在形变过程中发生ε及马氏体相变,也会引起钢的变脆.

 
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