用过零极性相关法测量流体流速

利用研制的相关测试系统，借助高精度的热线风速仪作为标定设备，在标准风洞内进行了相关测量的实验研究，实现了利用过零极性相关法测量流体流速，并对测量结果进行了分析。     

多家相关数据的样条拟合

多家数据的样条拟合，已有不少工作，但都没考虑相关误差。文章处理了相关数据，推导公式并编写程序，研究了相关性对拟合值的影响，对ＰＰＰ问题也作了讨论。     

碱土元素锶,钡,镭年龄相关的生物动力学模式

本文介绍ＩＣＲＰ６７号出版物提出的关于碱土元素年龄相关的生物动力学芨相应的基本参数，说明涉及碱土元素锶，钡，镭年龄相关的代谢参数值的导出过程，以便加深对现行模式的理解，进一步了解相关参数值其间的纵横联系。     

基于遗传算法的神经网络分类器

本文基于遗传算法和级联相关算法的组合，提出了遗传辅助级联相关学习算法。该算法能够根据问题的需要自动设计网络结构，同时能有效地消除竞争协议问题。实验结果表明，与级联相关算法相比，它具有结构紧紧，泛化能力好等优点。     

岭澳核电厂先进燃料管理项目重点问题的审评

本文对岭澳核电厂先进燃料管理项目中重点问题的审评进行了探讨，根据相应法规、标准和国际国内相关经验，给出了相关问题的审评结论。     

锕系元素钚、镅、镎年龄相关的生物动力学模式

本文根据ＩＣＲＰ６７号出版物提出的关于锕系元素年龄相关的生物动力学模式及相应的基本参数，说明涉及锕系元素钚、镅、镎年龄相关的代谢参数值导出过程，以便加深对现行模式的理解，进一步了解相关参数值其间的纵横联系。     

温度噪声相关测速方法的系统误差与自标定

研究了流体噪声的湍流传递行为及信号源的性质对相关测速系统的影响，分析了相关测速系统的系统误差，并提出了理论修正该误差的方法，使得相关测速成为一种绝对的测量方法。在理论分析的基础上进行了实验研究，理论与实践得到了较好的统一。     

Progress on Study of ^93Zr Separation

由于普通时域内的自相关测量只能给出脉宽等有限的信息，不能给出光强和相位在时域和频域内的分布，而传统紫外测量方法就是基于双光子过程的自相关测量；且由于自相关测量缺乏足够的独立性，要求仔细检查光谱的响应、信号光强与入射光强的相关性，     

典型事故工况下压水堆核电厂内工作人员辐射风险分析方法研究

基于概率论和确定论分析方法建立了事故工况下场内工作人员辐射剂量控制的体系。针对典型三代压水堆核电厂，建立了事故工况下场内工作人员辐射风险分析的方法论，并采用典型事故进行验证。验证结果表明，对于选取的堆外放射性系统相关典型事故，建立的辐射风险控制体系和分析方法可很好地评估并控制事故工况下场内工作人员的辐射风险。该方法可进一步扩展至堆芯相关事故以及其他堆外放射性系统相关事故，从而提升压水堆核电厂辐射防护最优化水平。     

放射性核废料自埋过程中的热量阈值

针对恒释热率热源接触熔化，提出了热量阈值的概念。分析计算了典型反应堆核废料自埋接触熔化过程中的热量阈值和达到阈值的时间以及相应的熔化深度，并与相关文献结果进行比较，指出了相关文献中的一些错误，得出了一些有意义的结论。     

钚自辐照老化过程中氦效应理论研究进展

钚因放射性衰变而出现自辐照老化效应。钚中氦行为是理解钚自辐照老化效应的一个基础和前提。运用分子动力学模拟技术,计算研究了钚中缺陷行为、氦与缺陷的相互作用、氦泡的初始形核过程、氦泡的长大过程以及氦泡对钚材料宏观性能的影响等。其中,钚-钚、钚-氦和氦-氦相互作用势分别采用修正嵌入原子多体势（modifiedembeddedatommethod,MEAM）、Morse对势和Lennard-Jones对势。主要的计算结果表明,氦原子与空位的结合能较大,在钚的自辐照过程中,两者易于结合并形成氦-空位团簇,成为氦泡的前驱体;氦泡可通过冲出位错环的机制而长大;氦泡的压力在GPa量级,且氦泡引起的基体膨胀很小。     

Plasma Treatment of Aluminum Using a Surface Barrier Discharge Operated in Air and Nitrogen: Parameter Optimization and Related Effects

This paper presents the results of aluminum surface treatment by diffuse coplanar surface barrier discharge. The goals are to study the effectiveness of the plasma treatment and the dependence of its efficiency on operation parameters, such as sample-to-electrode distance, treatment time or gas atmosphere. Three types of aluminum materials (bricks, sheets and thin films) were tested to ensure the reliability of the treatment. The changes in the surface properties were characterized by the surface free energy, atomic force microscopy, attenuated total reflectance Fourier transform infrared spectroscopy (ATR FTIR) and X-ray photoelectron spec- troscopy (XPS). The influence of aging effect on the treatment was also measured and discussed.     

A resistometric study of ageing in nimonic alloys (I). PE16

The Nimonic alloy PE16 is a candidate for use in a radiation environment in fast reactors. Williams and Fisher have investigated void-swelling in this alloy and have found it to be dependent upon the γ' precipitate present. In order to investigate the dependence of precipitation upon heat-treatment, the variation of the electrical resistivity with time on ageing PE16 at various temperatures between 580°C and 780°C has been measured. To account for the observed variation, a model based on nucleation and growth of γ' precipitates has been developed. This model allows for different scattering cross sections, and hence specific resistivities, of particles in small and large clusters. The rate constants for nucleation and growth are found to follow the usual Arrhenius behaviour with activation energies of 1.11 eV and 1.83 eV respectively. Specimens aged at different temperatures for varying times t, were viewed in the electron microscope. The observations have indicated that the precipitate diameter varies as $\text{(K}{}_2\text{t)}{}^{\mathrm{<mtext>1</mtext><mtext>2</mtext>}}$, where K₂ is the growth rate constant.     

Numerical simulations of the phase separation properties for the thermal aged CDSS with Phase Field Model

Experiments and numerical simulations with Phase Field Model and Finite Element Analysis were carried out to investigate the phase separation dynamic properties and the corresponding thermal aging degradation mechanism. Experimental results from transmission electron microscopy and atomic force microscopy show that thermal aging causes the Cr-rich phase precipitate and form clusters. A phase field dynamic model was developed with constitutive relations and empirical potential functions to investigate the phase separation dynamics in the ferrite phase. Numerical results integrated with cell dynamical system method show clearly the micro structure morphology and the phase separation coarsening with aging time. The evolution process of the phase separation was quantitatively illustrated and reproduced macroscopically. The scattering pattern becomes clearer and the corresponding radius becomes smaller along with the increasing aging time. The average characteristic length increases firstly then decreases and enters a more stable stage. With the increment of the local Cr concentration, the evolution of the phase morphology was quite different. Finite Element Analysis simulation results with the Gurson-Tvergaard-Needleman void model show that the damage initiated more easily in the ferrite matrix for the Cr atoms forming clusters with increasing aging time. The phenomenological simulations with Phase Field Model and Finite Element Analysis were in remarkably good agreement with experimental results and analytical considerations.     

Investigations on strength and ductility of base metals and welded joints of steels for power plants at elevated temperatures

Dynamic strain aging can appear at low alloyed ferritic steels and their welded joints. It influences the strength as well as toughness of the steels. It causes a relative maximum of impact energy at temperatures around 300°C. It also causes a distinct dependence of the strain rate on the shape of crack resistance curves. A lower slope of J_R-curves is to be found at higher deformation rates. The technical initiation J_Ic has a relative minimum in the range between 200 and 300°C.     

Strain ageing of quenched zircaloy-2

The stain ageing behaviour of quenched Zircaloy-2 has been studied in the temperature range 150 to 475°C. Quenching from 750°C enhanced the strain ageing response at 300° C and suppressed it at ~450°C compared with the behaviour of annealed and slow cooled Zircaloy-2. Increasing the quenching temperature in the range 750 to 850°C increased the strain ageing response at all test temperatures. The yield stress and tensile strength increased with quenching temperature whereas the ductility was decreased.The enhanced strain ageing at 300°C is thought to be due to the presence of interstitial-interstitial atom pairs. The suppression of strain ageing at ~450°C is considered to be due to trapping of Fe atoms by quenched-in defects.     

一种新型中子剂量当量仪的能量响应性能分析

介绍了对一种新型中子剂量当量仪的能量响应性能的分析.用MCNP程序分别计算了它的各探测单元的中子注量能量响应,并按照中子剂量当量指示值的算法计算了它的中子周围剂量当量能量响应性能,从计算结果看,在热中子～15 MeV的能量范围内它的能量响应变化范围大约在0.55～1.95之间.计算了它在Am - Be源和Cf - 25...     

Investigation of thermal aging damage mechanism of the Cast Duplex Stainless Steel

Besides the macro-mechanical properties for thermal aging effect published in “Thermal aging effect on Z3CN20.09M Cast Duplex Stainless Steel” (Nuclear Engineering and Design 239(2009) 2217-2223), the thermal aging damage mechanism is investigated in this paper through nano-indentation tests and micro-structures evolution examination. Numerical simulations were carried out with GTN continuum damage model to investigate the different crack propagation process for aging. The nano-indentation hardness values increase with aging time for both phases while the hardness values of the ferrite phase are much higher and increase much more. The nano-indentation energy indicating the toughness decreases for both phases with aging time. TEM results show that the Cr-enriched α′ phase precipitates in the ferrite phase which is considered as the critical reason making the dislocation slip difficult and causing the increase of the strength and reduction of the toughness. The crack initiates from the ferrite phase instead of the austenite phase from the SEM observation and FEA simulation results, which reflects the change of the fracture mechanism for thermal aging.     

Managing the effects of aging and reliability improvement

Over recent years the electric power generating community has acknowledged the importance of the aging process on plant safety and availability. To cope with time-dependent degradation phenomena that can affect active as well as passive components and lead to unacceptable, unanticipated failures requires research into the mechanisms of the aging process, advances in predictive methods for assessing the aging impact on risk and availability, and a better understanding of power plant operations so that strategies for defending against this pervasive stress can be developed. This paper discusses current research advances and presents a framework to aid in the systematic integration of these three needs. It also discusses current research in the aging effect on electric components. As such it is anchored to research being conducted at Brookhaven National Laboratory in the areas of plant aging, life extension, reliability, performance indication, and risk assessment.     

高温及γ辐照老化对改性钠基膨润土影响的初步研究

为了确认高温及γ辐照对改性钠基膨润土的影响.以内蒙古高庙子改性钠基膨润土为研究对象,利用X射线衍射仪和同步热分析仪分析了高温热老化、γ辐照老化和γ辐照-热程序老化作用对改性钠基膨润土性能和微观结构的影响.发现单纯热作用或单纯的辐照作用影响较小,而辐射-热程序老化作用会显著影响改性钠基膨润土的微观结构.经过1000 kG...