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为满足用户抗辐射加固实验研究的需要,在中国第二号快中子脉冲反应堆上开展了提高特定区域内n/γ值初步实验研究。其中,n是待测辐射场中子注量,γ是相应辐射场的吸收剂量。 相似文献
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Fe-ZSM-5 分子筛催化剂上N2O一步氧化苯制苯酚的积炭动力学 总被引:2,自引:0,他引:2
采用等温固定床反应器和热重分析相结合的方法研究了 Fe-ZSM-5 分子筛上 N2O 一步氧化苯制苯酚的积炭行为, 考察了反应时间、温度和原料配比对积炭量的影响. 依据实验现象和积炭物组分分布的气相色谱-质谱分析结果, 提出了 Fe-ZSM-5 分子筛上 N2O 一步氧化苯制苯酚的积炭机理. 结果表明, Fe-ZSM-5 分子筛上的积炭物种主要来源于氧化产物苯酚的深度氧化, 属连串失活. 基于所提出的积炭机理和实验结果, 建立了 Fe-ZSM-5 分子筛催化剂的积炭动力学模型, 统计检验和残差分布检验表明, 所建模型与实验结果相容, 可靠性强. 相似文献
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The effect of particle shape on the rheological behavior of small particle-large polymer chain mixture solutions has been investigated with two model colloidal silica dispersions, one of which is ellipsoidal(BINDZIL20/440) and the other is spherical(TM40). It was found that BINDZIL20/440 series showed shear-thickening at lower shear rates and had a lower upper limit in PEO concentration to demonstrate shear-thickening phenomena. The particle shape was identified as the major factor accounting for these differences. This work enables one to control the rheological behavior of colloid-polymer mixture through simply changing particle geometry instead of performing surface modifications, which could be especially useful in cases where only certain chemicals are allowed, for example in vivo applications. 相似文献
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利用CFBR-Ⅱ快中子反应堆(中国第二座快中子脉冲堆)和60Co装置开展不同顺序的中子/γ辐照双极晶体管的实验。在集电极-发射极电压恒定条件下,测量了双极晶体管电流增益随集电极电流的变化曲线,研究不同顺序中子/γ辐照对双极晶体管电流增益的影响。分析实验结果发现,集电极-发射极电压一定时,集电极电流极低情况下电流增益退化比较大,随集电极电流增加电流增益逐渐减小;就实验选中的两类晶体管而言,先中子后γ辐照造成双极晶体管电流增益的退化程度大于先γ后中子辐照,而且PNP型晶体管比NPN型晶体管差异更明显。本文进行了双极晶体管电离/位移协同辐照效应相关机理的初步探讨。 相似文献
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给出图闭模糊映射和闭模糊映射的关系:图闭模糊映射一定是闭模糊映射;若闭模糊映射是上半连续的则它也是图闭模糊映射. 相似文献
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在矩阵理论框架下,引入了模糊有限自动机转移矩阵,变换矩阵半群以及覆盖概念.定义了模糊有限自动机Kronecker积,讨论了其转移矩阵性质及变换矩阵半群间的覆盖关系. 相似文献
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In this paper, the continuum self-consistent field theory(SCFT) is applied to study the structure and the interaction of the adsorption of symmetrical ABA polyampholytes(PAs) between two neutral planes. It is found that the amounts of all the conformations decrease with the increase of the charge fraction of polymer chain, and increase with the increase of the bulk salt concentration and become saturated at high bulk salt concentration. The effective interaction between the two planes presented a long-range repulsion. Splitting it into various components and relating with the dependence of the variations of the conformations on environment parameters, we try to find the origin of the total long-range interaction between the two planes. 相似文献