Inhibitory ability of children with developmental dyscalculia(DD) was investigated to explore the cognitive mechanism underlying DD.According to the definition of developmental dyscalculia,19 children with DD-only a...Inhibitory ability of children with developmental dyscalculia(DD) was investigated to explore the cognitive mechanism underlying DD.According to the definition of developmental dyscalculia,19 children with DD-only and 10 children with DD&RD(DD combined with reading disability) were selected step by step,children in two control groups were matched with children in case groups by gender and age,and the match ratio was 1:1.Psychological testing software named DMDX was used to measure inhibitory ability of the subjects.The differences of reaction time in number Stroop tasks and differences of accuracy in incongruent condition of color-word Stroop tasks and object inhibition tasks between DD-only children and their controls reached significant levels(P〈0.05),and the differences of reaction time in number Stroop tasks between dyscalculic and normal children did not disappear after controlling the non-executive components.The difference of accuracy in color-word incongruent tasks between children with DD&RD and normal children reached significant levels(P〈0.05).Children with DD-only confronted with general inhibitory deficits,while children with DD&RD confronted with word inhibitory deficits only.展开更多
室内合成的聚胺强水化抑制剂SD-A可有效抑制黏土水化分散,与国外同类产品Ultrahib性能相当。聚胺水基钻井液配方为:4%膨润土浆+3%SD-A+0.5%SD-E+1%PAC-LV+0.3%XC+3%SD-506。与聚合醇、阳离子、KCl/聚合物钻井液相比,二级膨润土在聚胺水...室内合成的聚胺强水化抑制剂SD-A可有效抑制黏土水化分散,与国外同类产品Ultrahib性能相当。聚胺水基钻井液配方为:4%膨润土浆+3%SD-A+0.5%SD-E+1%PAC-LV+0.3%XC+3%SD-506。与聚合醇、阳离子、KCl/聚合物钻井液相比,二级膨润土在聚胺水基钻井液中的膨胀率最小,岩屑回收率最高,表明聚胺水基钻井液抑制页岩水化分散能力强。聚胺水基钻井液120℃热滚16 h前后的流变性能稳定,热滚后动塑比为1.07,高于油基钻井液。在400 mL聚胺水基钻井液中分别加入144 g NaCl、8 g CaCl2和80 g劣土后,体系流变性发生不同程度的改变,而滤失量变化较小,其中CaCl2对体系流变性影响最大。结果表明聚胺水基钻井液的抗污染能力较强。屈曲硬度实验、耐崩散实验和黏结实验等新型实验方法表明,聚胺水基钻井液的抑制性接近甚至超过油基钻井液,清洁润滑性优良,其EC值为12 g/L,符合环保要求。另外,简要分析了聚胺水基钻井液的抑制机理。展开更多
文摘Inhibitory ability of children with developmental dyscalculia(DD) was investigated to explore the cognitive mechanism underlying DD.According to the definition of developmental dyscalculia,19 children with DD-only and 10 children with DD&RD(DD combined with reading disability) were selected step by step,children in two control groups were matched with children in case groups by gender and age,and the match ratio was 1:1.Psychological testing software named DMDX was used to measure inhibitory ability of the subjects.The differences of reaction time in number Stroop tasks and differences of accuracy in incongruent condition of color-word Stroop tasks and object inhibition tasks between DD-only children and their controls reached significant levels(P〈0.05),and the differences of reaction time in number Stroop tasks between dyscalculic and normal children did not disappear after controlling the non-executive components.The difference of accuracy in color-word incongruent tasks between children with DD&RD and normal children reached significant levels(P〈0.05).Children with DD-only confronted with general inhibitory deficits,while children with DD&RD confronted with word inhibitory deficits only.
文摘室内合成的聚胺强水化抑制剂SD-A可有效抑制黏土水化分散,与国外同类产品Ultrahib性能相当。聚胺水基钻井液配方为:4%膨润土浆+3%SD-A+0.5%SD-E+1%PAC-LV+0.3%XC+3%SD-506。与聚合醇、阳离子、KCl/聚合物钻井液相比,二级膨润土在聚胺水基钻井液中的膨胀率最小,岩屑回收率最高,表明聚胺水基钻井液抑制页岩水化分散能力强。聚胺水基钻井液120℃热滚16 h前后的流变性能稳定,热滚后动塑比为1.07,高于油基钻井液。在400 mL聚胺水基钻井液中分别加入144 g NaCl、8 g CaCl2和80 g劣土后,体系流变性发生不同程度的改变,而滤失量变化较小,其中CaCl2对体系流变性影响最大。结果表明聚胺水基钻井液的抗污染能力较强。屈曲硬度实验、耐崩散实验和黏结实验等新型实验方法表明,聚胺水基钻井液的抑制性接近甚至超过油基钻井液,清洁润滑性优良,其EC值为12 g/L,符合环保要求。另外,简要分析了聚胺水基钻井液的抑制机理。