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Frontiers in Energy 2021年第4期15卷 842-853页

作者： Ferry ROELOFS Antoine GERSCHENFELD Katrien Van TICHELEN Nuclear Research and Consultancy Group(NRG) Westerduinweg 31755 LEPettenThe Netherlands CEA DES UniversitéParis-SaclayF-91191 Gif-sur-YvetteFrance sck cen Boeretang 2002400 MolBelgium

A significant role for a future nuclear carbonfree energy production is attributed to fast reactors,mostly employing a liquid metal as a *** paper summarizes the efforts that have been undertaken in collaborative projects sponsored by the European Commission in the past 20 years in the fields of liquid-metal heat transfer modeling,fuel assembly and core thermal hydraulics,pool and system thermal hydraulics,and establishment of best practice guidelines and verification,validation,and uncertainty quantification(UQ).The achievements in these fields will be presented along with the prospects on topics which will be studied collaboratively in Europe in the years to *** prospects include further development of heat transfer models for applied computational fluid dynamics(CFD),further analysis of the consequences of fuel assembly blockages on coolant flow and temperature,analysis of the thermal hydraulic effects in deformed fuel assemblies,extended validation of three-dimensional pool thermal hydraulic CFD models,and further development and validation of multi-scale system thermal hydraulic methods.

关键词： liquid metal thermal hydraulics Europe

Effects of surfactant on properties of MIM feedstock

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中国有色金属学会会刊：英文版 2007年第1期17卷 1-8页

作者：李益民刘相权罗丰华岳建岭 State Key Laboratory of Powder Metallurgy Cen tral South University

Effects of the surfactant for improving the properties of MIM feedstock were investigated. Feedstocks were prepared by 17-4PH stainless steel(SS) powder and paraffin wax-based binder containing different contents of stearic acid(SA) as the surfactant. The viscosity of the feedstock decreases significantly when the SA is added. Besides, the wetting angle of the binder against the 17-4PH SS powder decreases greatly and the critical solid loading increases with the adding of the SA. Fourier transformation infrared spectroscopy(FTIR) analysis was used to prove the interaction between the SA and the 17-4PH SS powder. Chemical bonding is found on the surface of 17-4PH SS powder after mixing and it helps a lot to enhance the interacting force between the binder and the powder. Then an adsorbing model was adopted to estimate the least content of the surfactant that formed a monolayer adsorption on the mono-sized spherical powder (with smooth surface). The least content of the surfactant is calculated to be 0.19%. Whereas, the experiments indicate that about 5% is the optimal value to improve the properties of the feedstock. The reason may come from two aspects: firstly, the powders used in current experiment are not all mono-sized spheres and the coarse surface of the powder has a great effect on the adsorptive capacity of the powder; secondly, multilayer adsorption is likely to occur on the powder surface, which will also increase the adsorptive capacity.

关键词：喷射造型法金属加工表面活性剂合金

Inhibition mechanism of aspartic acid on crystal growth of hydroxyapatite

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中国有色金属学会会刊：英文版 2007年第3期17卷 612-616页

作者：黄苏萍周科朝李志友 State Key Laboratory of Powder Metallurgy Cen tral South University

The effects of aspartic acid on the crystal growth, morphology of hydroxyapatite(HAP) crystal were investigated, and the inhibition mechanism of aspartic acid on the crystal growth of hydroxyapatite was studied. The results show that the crystal growth rate of HAP decreases with the increase of the aspartic acid concentration, and the HAP crystal is thinner significantly compared with that without amino acid, which is mainly due to the (1 010) surface of HAP crystal being inhibited by the aspartic acids. The calculation analysis indicates that the crystal growth mechanism of HAP, following surface diffusion controlled mechanism, is not changed due to the presence of aspartic acid. AFM result shows that the front of terrace on vicinal growth hillocks is pinned, which suggests that the aspartic acid is adsorbed onto the (1 010) surface of HAP and interacts with the Ca2+ ions of HAP surface, so as to block the growth active sites and result in retarding of the growth of HAP crystal.

关键词：羟磷灰石晶体生长抑制机构天门冬氨酸

Seismic Isolation of Reactor Assembly for a Fixed Base Accelerator Driven System Reactor Building

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Journal of Civil Engineering and Architecture 2016年第2期10卷 203-210页

作者： Bong Yoo Didier De Bruyn Primary System Design Group SCK-CEN Belgium Nuclear Research Center Mo12400 Belgium

In the SILER （Seismic-Initiated events risk mitigation in LEad-cooled Reactors） Project, it is interesting to apply seismic isolation technology for the reactor assembly of the fixed base reactor building for ADS （Acceleration Driven System） heavy liquid reactor MYRRHA （Multipurpose Hybrid Research Reactor for High-Tech Application） which contains the most critical safety related components, such as reactor vessel, safe shutdown and control rod mechanisms, primary heat exchangers, primary pumps, spoliation target assembly and fuel assemblies, etc. The purpose of this paper is to investigate the possibility of an application of a partial seismic isolation to the safety critical components only, here, the reactor assembly. This paper presents the preliminary analysis results of the isolated reactor assembly and compares these with those of seismic isolated ADS reactor building. The analysis results show the reduction of the seismic acceleration response but the increase of the relative displacement for the reactor assembly. Some safety issues, especially, coolant＇s incapable covering the reactor core make difficult to apply for the partial seismic isolation of the ADS reactor assembly due to large relative displacement occurring the partial isolation system. Further study on the partial seismic isolation application of the critical safety components are also discussed.

关键词： Partial seismic isolation ADS MYRRHA reactor building reactor assembly interface systems FRS (floor responsespectra) reduction of accelerations increase of relative displacement reactor safety issues.

Bayesian model averaging(BMA)for nuclear data evaluation

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Nuclear Science and Techniques 2024年第11期35卷 193-218页

作者： E.Alhassan D.Rochman G.Schnabel A.J.Koning sck cen(Belgian Nuclear Research centre) Boeretang 2002400 MolBelgium Laboratory for Reactor Physics and Thermal‑Hydraulics Paul Scherrer Institute5232 VilligenSwitzerland Nuclear Data Section International Atomic Energy Agency(IAEA)ViennaAustria Division of Applied Nuclear Physics Department of Physics and AstronomyUppsala UniversityUppsalaSweden

To ensure agreement between theoretical calculations and experimental data,parameters to selected nuclear physics models are perturbed and fine-tuned in nuclear data *** approach assumes that the chosen set of models accurately represents the‘true’distribution of considered ***,the models are chosen globally,indicating their applicability across the entire energy range of ***,this approach overlooks uncertainties inherent in the models *** this work,we propose that instead of selecting globally a winning model set and proceeding with it as if it was the‘true’model set,we,instead,take a weighted average over multiple models within a Bayesian model averaging(BMA)framework,each weighted by its posterior *** method involves executing a set of TALYS calculations by randomly varying multiple nuclear physics models and their parameters to yield a vector of calculated ***,computed likelihood function values at each incident energy point were then combined with the prior distributions to obtain updated posterior distributions for selected cross sections and the elastic angular *** the cross sections and elastic angular distributions were updated locally on a per-energy-point basis,the approach typically results in discontinuities or“kinks”in the cross section curves,and these were addressed using spline *** proposed BMA method was applied to the evaluation of proton-induced reactions on ^(58)Ni between 1 and 100 *** results demonstrated a favorable comparison with experimental data as well as with the TENDL-2023 evaluation.

关键词： Bayesian model averaging(BMA) Nuclear data Nuclear reaction models Model parameters TALYS code system Covariances

The Role of Computational Intelligence in Sensory Evaluation

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Journal of Donghua University(English Edition) 2004年第3期21卷 21-25页

作者：阮达 The Belgian Nuclear Research centre (sck. cen) Boeretang 200 B-2400 Mol Belgium

Sensory evaluation is the evaluation of signals that a human receives via its senses of sight, smell, taste, touch and hearing. In today’s industrial companies, sensory evaluation is widely used in quality inspection of products, in marketing study and in many other fields such as risk evaluation, investment evaluation and safety evaluation. In practice, setting up a suitable mathematical formulation, an efficient working procedure and a pertinent computing method for sensory evaluation is quite difficult because of uncertainty and imprecision in sensory panels and their results involving linguistic expressions, non normalized data, data reliability, etc. At the present a prime problem of the practitioner is not the lack of useful methods but the lack of transparency in this area. In this tutorial lecture, we briefly describe some of the technology in the computational intelligence (CI) areas that has been developed for application to sensory evaluation and related fields. Moreover, we will illustrate the role of CI in sensory evaluation related applications from some recent publications.

关键词： computational intelligence fuzzy logic neural networks genetic algorithms intelligent hybrid systems sensory evaluation

Destabilization analysis of overlapping underground chambers induced by blasting vibration with catastrophe theory

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中国有色金属学会会刊：英文版 2006年第3期16卷 735-740页

作者：闫长斌徐国元左宇军 School of Resources and Safety Engineering Cen tral South University Changsha 410083 China

According to the main characters of overlapping underground chambers, the roof (floor) of two adjacent underground chambers is simplified to the mechanical model that is the beam with build-in ends. And vibration load due to blasting is simplified to harmonic wave. The catastrophic model of double cusp for underground chambers destabilization induced by blasting vibration has been established under the circumstances of considering deadweight of the beam, and the condition of destabilization has been worked out. The critical safety thickness of the roof (floor) of underground chambers has been confirmed according to the destabilization condition. The influence of amplitude and frequency of blasting vibration load on the critical safety thickness has been analyzed, and the quantitative relation between velocity, frequency of blasting vibration and critical safety thickness has been determined. Research results show that the destabilization of underground chambers is not only dependent on the amplitude and frequency of blasting vibration load, but also related to deadweight load and intrinsic attribute. It is accordant to testing results and some related latest research results of blasting seismic effect. With increasing amplitude, the critical safety thickness of underground chambers decreases gradually. And the possibility of underground chambers destabilization increases. When the frequency of blasting vibration is equal to or very close to the frequency of beam, resonance effect will take place in the system. Then the critical safety thickness will turn to zero, underground chambers will be damaged severely, and its loading capacity will lose on the whole.

关键词：爆破振动地下开采扰动突变理论临界安全厚度

The Use of Microcontrollers by Scientists in Experimental Research Applications

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World Journal of Nuclear Science and Technology 2015年第1期5卷 18-26页

作者： J. L. Genicot Radiation Dosimetry & Calibration Environmental Health and Safety Belgian Nuclear Research Centre SCK&middot cen Mol Belgium

If the microcontrollers are devices quite easy to use for experts in electronics, a scientist devoted to different research topics from digital electronics is generally totally unable to develop and use these complex components. Most of the time, the researcher is looking for simple devices able to control different parameters during his experimentation. He is obliged in this case to request the intervention of an expert in electronics to develop such a device and the result is sometimes different from the precise initial requirement. Nowadays, it is possible to find on the market, simple units able to satisfy the requirements of the scientist and easy enough to be manipulated by him in specific applications. The purpose of this paper is to present some of these devices and to compare their possibilities and the ways to use them. These devices are compared in optically stimulated dosimetry with applications found in external dosimetry, interventional radiology, nuclear medicine and space dosimetry.

关键词： Microelectronics External Dosimetry Experimental Research USB Card

Effects of Ag addition on mechanical properties and microstructures of Al-8Cu-0.5Mg alloy

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中国有色金属学会会刊：英文版 2006年第4期16卷 766-771页

作者：宋旼陈康华黄兰萍 State Key Laboratory of Powder Metallurgy Cen tral South University Changsha 410083 China

The mechanical properties and microstructures of Al-8Cu-0.5Mg alloy with and without Ag addition were studied at both room- and elevated-temperatures. The results show that the alloy with Ag is strengthened by a homogeneous distribution of coexistent θ′ and ? precipitates on the matrix (001) and (111) planes, respectively, whereas the alloy without Ag by θ′ precipitates only. The small size and high volume fraction of θ′ and ? precipitates in the Ag-containing alloy improve the tensile strength and yield strength, especially those at the elevated temperatures. However, it is also responsible for the decrease in elongation, compared with the alloy without Ag, which is due to the microcracks initiated from the inherent incompatibility between the particles and the Al matrix during deformation.

关键词： Al-Cu-Mg 铝合金机械性能显微结构银