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排序方式: 共有110条查询结果,搜索用时 15 毫秒
31.
为了获得反应堆压力容器(RPV)材料在高温下的蠕变行为,保证RPV在严重事故工况下的完整性,本研究对国产RPV用16MND5钢的高温蠕变性能进行了测试,获得了600~900℃下材料的蠕变性能,并基于应变强化的基本蠕变本构模型与基于延性耗竭理论的蠕变损伤模型,建立了适用于16MND5钢的蠕变损伤本构模型,给出了材料的蠕变损伤模型参数。结果表明,本文提出的蠕变损伤本构模型的有限元模拟数据与试验数据符合性较好,验证了此蠕变损伤模型的正确性。该方法可用于严重事故情况下RPV的蠕变损伤分析,为RPV的完整性分析提供支持。 相似文献
32.
带拐角裂纹的反应堆压力容器接管的安全分析 总被引:1,自引:0,他引:1
从疲劳断裂的角度对反应堆压力容器(RPV)在两种停堆过程中,带拐角裂纹的RPV接管的安全性进行了分析评定。针对压力和温度随时间变化的复杂情况,采用“半解析法”和弹塑性断裂力学观点进行了大量的分析计算。结果表明,ASME规范第Ⅺ卷的观点(以LEFM为基础)似偏保守。 相似文献
33.
A study using some available high-quality data from German surveillance and research programmes has been carried out in order to provide evidence on the prediction capabilities of a semi-mechanistic model for changes in ductile to brittle transition temperature. The model was developed and tuned originally on model alloys and later proved to be suitable also for WWER and other materials. This study demonstrates that the model can predict very well all the results obtained on low nickel–manganese weld metals and that the corrections required for high nickel–manganese weld metals are consistent with those found for model alloys. 相似文献
34.
J. R. Tarpani W. W. Bose Filho D. Spinelli 《Journal of Materials Engineering and Performance》2002,11(4):414-421
The elastic-plastic fracture toughness and crack extension behavior under quasi-static loading regimes of the as-received
and several thermally embrittled states of a reactor pressure vessel (RPV) steel were assessed on the basis of microstructural
parameters. Through a simple rule of mixture that is typically applied for composite materials, it was found that the equivalent
grain size (EGS) of dual-phase annealed microstructures is the controlling parameter of the fracture properties. It was concluded
that a Hall-Petch type relationship correlates the J-fracture mechanics criteria to the EGS. 相似文献
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反应堆压力容器(RPV)支座在核电厂设计中属ASME核安全1级支承,是关系到RPV安全的关键设备。通过建立支座的"流-固"耦合CFD模型和基于响应面法的实验设计,分析了支座入口空气流速和温度对支座温度场和空气流场的影响规律;进一步面向支座底面最高温度限制和减小空气流速的双目标要求,获得了优化的入口空气参数组合;最后通过对比"流-固"耦合模型结果和响应面法拟合结果,证明了模型和分析方法的正确性。 相似文献
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At the Paul Scherrer Institut, a methodology for PWR fast neutron fluence estimations, based on the Monte-Carlo particle transport code MCNPX with general-purpose neutron data libraries and using neutron source data from deterministic 3-D core-follow calculations, has been developed. The methodology has been validated on the basis of experimental data related to the fluence at the inner surface of a Swiss PWR Reactor Pressure Vessel. In this technical note, a first objective is to enlarge the validation basis of the methodology as well as to extend it for applications to RPV outer-surfaces. To that aim, a preliminary analysis with the MCNPX-2.4.0 code, along with the JEFF-3.1 continuous-energy neutron data library, of the “H.B. Robinson-2 Pressure Vessel Benchmark”, providing in-vessel and out-vessel experimental dosimetry data, is presented. In addition, considering that the available original solutions of the benchmark employed deterministic transport methods with associated libraries, a second objective of this technical note is to assess the progress achieved for this type of problems when applying modern Monte-Carlo based methods. The results show that for the 237Np and 238U fission dosimeters, which were of primary interest in the given study, a non-negligible improvement is seen in the MCNPX solution, indicating thus a rather good performance of the employed Monte-Carlo method and providing thereby, additional confidence for the overall PSI fluence methodology. For other high-energy dosimeters, the presented new results do not show yet any significant accuracy improvement versus previously reported results. This can however not be confirmed before additional studies, e.g., with focus on improvements of the involved modelling approximations and the statistical precision of the MCNPX calculations, be carried out. Similarly, investigations of neutron cross-section and dosimetry libraries effects remain to be addressed. These further studies are however not included here since at this stage, the principal aim was mainly to model and analyse this benchmark at most consistent manner with the previous solutions using a continuous-energy Monte-Carlo based method. 相似文献
40.