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排序方式: 共有120条查询结果,搜索用时 93 毫秒
1.
为了探明低碳钢在带钢轧制过程中出现边部翘皮缺陷的形成原因,取样分析了翘皮缺陷形貌及夹杂物成分,并采用ø750 mm×550 mm高刚度二辊热轧机组进行实验室模拟轧制分析翘皮缺陷演化过程。通过建立不同轧制方案,探明了热轧带钢翘皮缺陷形成于精轧道次,缺陷的产生与坯表面质量和边部原始凝固组织无关,轧材在轧制过程中由于边部不均匀变形形成侧面凹陷,凹陷在后续轧制中被轧制压缩闭合,并翻转到表面成为翘皮缺陷。最后,工业生产试验表明,倒角铸坯可提高轧材边部在轧制过程中的温度和均匀性,抑制轧材边部不均匀变形,有效降低翘皮缺陷的发生率。 相似文献
2.
《Journal of Nuclear Science and Technology》2013,50(9):700-709
In safety evaluation of nuclear waste repository systems, the analysis on migration of radionuclides in geologic media is important. In previous analytical models called Band- Release, Step-Release and Impulse-Release for decay chains, nuclide-specific release rate and time-dependence of release rate can not be taken into consideration. In this paper, two new release models are proposed. In Preferential-Release model, both of nuclide-specific release rate and time-dependence of leach are taken into account. Exponential-Release model is a special case of Preferential-Release model, in which no preferentiality in leach is assumed. The obtained analytical solutions for these new models are applicable even to four or more member decay chains and are as simple as those for the previous models. As an example of the application of the new models, the discharge rates of the four nuclides in the decay chain of 238Pu→234U→ 230Th→236Ra→ into a surface water body are calculated as a function of time after the start of leach and path length from the repository. By using the result, heavy hazard due to 238Pu at short distance and 226Ra at long distance are also discussed briefly. 相似文献
3.
《Journal of Nuclear Science and Technology》2013,50(9):853-861
Neutron nuclear data for 15 minor nuclides (Z>88) have been evaluated in the energy range of 10?5 eV–20 MeV. Since only few experimental data are available, the present evaluation was mainly based on the systematics of the data from neighboring nuclides and also optical and statistical model calculations. The evaluations have been carried out for neutron cross sections of total, elastic scattering, inelastic scattering, (n, 2n), (n, 3n), (n, 4n), fission and capture reactions. In addition, angular and energy distributions of the emitted neutrons and average number of the emitted neutrons per fission were also evaluated. The results were compiled in the ENDF/B-V format and stored in the JENDL-3. 相似文献
4.
蒋理 《冶金设备管理与维修》2014,(4):45-47
中板二辊轧机压下蜗轮异常磨损问题,常规检测及从装配上难以查明原因,而从蜗轮蜗杆设计和金加工上分析,找出了其损坏机理及对策。 相似文献
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6.
介绍了渐开线圆柱齿轮倒棱刀的设计原理和设计方法,提出了使用CAD软件进行倒棱刀切削仿真的方法,提高了复杂倒棱刀设计效率;介绍了几种特殊的倒棱刀设计方法,解决了有齿端台阶、齿端倒角、变棱边倒棱等特殊要求的产品倒棱刀设计难题。 相似文献
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8.
由于镭厂退役废物的多样性,多必须适当分类后才能分别进行处理处置。利用现有条件,将含镭低放废物进行废铀矿井处置是合理,安全和经济的。 相似文献
9.
钢管倒棱机的设计研究 总被引:1,自引:0,他引:1
为了适应钢管制造业的发展 ,有必要设计先进的钢管倒棱机。为此 ,从国内外倒棱机的典型结构入手 ,阐述了倒棱机的整机布置方案、动力传动方式、夹紧装置类型、随动切削头设计及控制系统设计等技术发展现状。在分析对比各设计项目优缺点的基础上 ,指出对于高质量的钢管生产用倒棱机 ,宜采用移动床头箱平移钢管式布置方式、左右侧向抱管式夹紧装置、径向浮动切削头、PLC控制以及灵活选用动力传动方式等设计方案 相似文献
10.
Gross-α and gross-β, activities of eight well and five tap water samples taken in
stanbul were determined. Ra226, Rn222, Pb214, Bi214, K40, Cs137 activity concentrations in four lake, four sea water, one snow and one rain water samples were also analyzed in order to determine their radioactivity. The results obtained showed that, in general, natural activities in drinking water samples did not exceed WHO and ITS guidelines. In sea and lake water, four samples were over WHO and TSI guidelines. Concentrations ranging from 0.007 to 0.04 Bq l−1 and from 0.02 to 0.1 Bq l−1 were observed for drinking water and the gross-α and gross-β activities, respectively. For all samples the gross-β activities were higher than the corresponding gross-α activities. In order to evaluate the annual effective dose equilavent of ingestion of these waters, a conservative dosimetric calculation was carried out using dose conversion factor suggested by the ICRP. An average annual effective dose equivalent of 0.84 μSv y−1 for Ra226 was calculated. 相似文献