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| 1 | Thermal analysis as a microstructure prediction tool for A356 aluminium parts solidified under various cooling conditions显示文摘Thermal analysis technique has been used for a long time,in both ferrous and nonferrous industries for evaluating the metallurgical quality of the liquid metal before casting.However,obtaining a proper microstructure in a standard cup does not ensure that the microstructure is correct in real parts which may solidify at very different cooling rates.For this study,alloy A356 with different metal quality in terms of modification and grain refinement was tested.Different cooling rates were obtained by using cylindrical test samples with various diameters cast in sand and metallic moulds.The correlation between microstructure features such as grain size,modification rate and secondary dendrite arm spacing (SDAS) measured in the standard thermal analysis cup with those obtained in the cylindrical test parts has been investigated.Thus,knowing the thermal modulus and the mould type it is possible to establish the required grain size and modification rate in the standard cup in order to get a desired structure in a real part.Corrective actions can then be taken in order to improve the metallurgical quality before casting the part. | A.Niklas U.Abaunza A.I.Fernández-Calvo J.Lacaze R.Suárez | 2011 | China Foundry2011，8，1： | 10 |
| 2 | 不同冷却条件下A356铝合金铸件凝固组织的预测工具--热分析法显示文摘在浇注铝合金铸件之前,用标准杯进行热分析以控制金属液并预测铸件的微观组织,已有数十年的历史。但是,在标准杯中获得适宜的微观组织并不能保证在真实铸件中也是如此,因为真实铸件可能是在完全不同的冷却速度下凝固的。本研究从晶粒细化和变质处理两方面试验了不同品质的A356合金。通过砂型铸造和金属型铸造不同直径的圆柱试样来达到不同的冷却速度。研究了在标准热分析试杯中测得的晶粒尺寸、变质率和二次枝晶臂间距(SDAS)与在圆柱试样中获得的同样参数之间的相互关系。因此,只要知道热模数和铸型类型,就能够确定所要求的标准热分析试杯中的晶粒尺寸和变质率,从而在真实铸件中获得所要求的组织。这样就能在浇注铸件前采取相应措施以改善冶金质量。 | A.Niklas U.Abaunza A.I.Fernández-Calvo J.Lacaze R.Suárez 朱文高 | 2010 | 铸造2010，59，11： | 1 |
| 3 | Supervisory control of concurrent discrete-event systems显示文摘Concurrency is a common feature in most industrial systems,where several components can execute different actions simultaneously.In this paper,we first introduce a new feasible nonblocking concurrent supervisory control map for a concurrent system,and subsequently,new concepts of concurrent controllability and concurrent observability.Then we present a sufficient and necessary condition for the existence of a feasible nonblocking concurrent supervisory controlmap to achieve a given concurrent language.After introducing a new concept of prefix-closed concurrent normality,we show that the supremal concurrently controllable and prefix-closed concurrently normal sublanguages exist and are computable.Our emphasis here is not to address the computational efficiency of solving concurrent supervisory control problems,which is still a technical challenge,but to show that the commonly used Ramadge–Wonham asynchronous control is simply a special case of our proposed concurrent control framework by providing an insightful treatment on compound events. | R.Su | 2015 | Journal of Control and Decision2015，2，2： | 0 |
| 4 | Numerical analysis of thermal process in the near field around vertical disposal of high-level radioactive waste显示文摘For deep geological disposal of high-level radioactive waste(HLW)in granite,the temperature on the HLW canisters is commonly designed to be lower than100fiC.This criterion dictates the dimension of the repository.Based on the concept of HLW disposal in vertical boreholes,thermal process in the nearfield(host rock and buffer)surrounding HLW canisters has been simulated by using different methods.The results are drawn as follows:(a)the initial heat power of HLW canisters is the most important and sensitive parameter for evolution of temperaturefield;(b)the thermal properties and variations of the host rock,the engineered buffer,and possible gaps between canister and buffer and host rock are the additional key factors governing the heat transformation;(c)the gaps width and thefilling by water or air determine the temperature offsets between them. | H.G.Zhao H.Shao H.Kunz J.Wang R.Su Y.M.Liu | 2014 | Journal of Rock Mechanics and Geotechnical Engineering2014，6，1： | 0 |
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