刘家峡水电厂1号机转轮更换前后稳定性分析

阐述了刘家峡水电厂1号机转轮更换前后机组的稳定运行情况,介绍了1号机原转轮叶片裂纹情况、补焊修复措施,并根据转轮更换前后机组稳定性试验数据,分析了机组在不同负荷区域的稳定性能。     

水轮机转轮叶片模压成型技术

介绍了水轮机转轮叶片模压制造所涉及的叶片展平方法、压模设计制造、叶片模压成型工艺及热处理等技术,并对今后制造模压叶片提出了一些改进措施。     

多腔注塑模具浇注系统的平衡研究

为了保证多腔注射模具浇注出的各个塑件的质量,注射加工过程中浇注系统应处于平衡状态,使塑料热熔体能够同时间、同压力、同温度到达并充满各型腔。对相同塑件和不同塑件分别使用平衡式和非平衡式多腔浇注系统进行分析,提出了为达到浇注系统的平衡在设计中应考虑的问题。     

Commercial Runner peanut cultivars in the USA: Fatty acid composition

Though peanuts are classified as a high‐fat food, they possess good proportions of fatty acids deemed as heart healthy. The fatty acid compositions of Runner peanuts were determined for commercially grown cultivars over two recent crop years. GC‐FID analyses revealed that the fatty acid levels for Runner peanuts were significantly (p <0.05) different among the normal, mid‐, and high‐oleic peanuts investigated. Oleic acid‐to‐linoleic acid (O/L) ratios were found to be 1.93 ± 0.30, 5.25 ± 1.12, and 16.9 ± 5.20 for normal, mid‐, and high‐oleic peanut lipids, respectively. Tamrun OL01 possessed a fatty acid profile characteristic of a mid‐oleic cultivar. From the sample set (n = 151), mean % weights for oleic acid and linoleic acid were 52.09 ± 2.84 and 27.38 ± 2.60 in normal, 69.33 ± 3.18 and 13.66 ± 2.35 in mid‐oleic, and 78.45 ± 2.05 and 5.11 ± 1.67 in high‐oleic peanuts, respectively. Cluster analysis segregated cultivars based on fatty acids into normal, mid‐, and high‐oleic groups. Factorial analysis revealed that cultivar effects were significant (p <0.01) for all fatty acids, except for lignoceric acid. Cultivar effects were also highly significant (p <0.001) for O/L, IV, unsaturated/saturated fatty acid (U/S) ratio, and % saturation. Significant crop year effects were shown for palmitic, oleic, arachidic, gondoic, and lignoceric acids, as well as U/S ratio and % saturation. Healthy unsaturated fats accounted for ?80% in all crop years and cultivars.     

注塑模具流道数控铣削加工编程方法研究

通过在对注塑模具流道数控铣削加工与NX编程软件研究的基础上,总结出了注塑模具流道数控铣削加工编程方法,并讨论了其实际应用的优缺点,对于模具生产加工具有实用价值。     

Runner sizing and weld line positioning for plastics injection moulding with multiple gates

Weld line and warping are two critical defects for injection-moulded part. If weld lines are unavoidable due to multiple gates in a moulding, they should be positioned in the non-critical region. Instead of using flow leaders and deflectors to control the locations of the weld lines, this paper presents an approach to specify the locations of the weld lines by sizing the runners in a multi-gated injection moulding with the optimum gate locations. The methodology consists of three steps: partitioning the moulding into sub-mouldings based on the specified weld line location, determining the optimum gate location in each sub-moulding by minimizing the injection pressure and repositioning the weld lines to the desired locations by varying the runner sizes. Two examples are used to illustrate the approach.     

盐锅峡水轮机转轮活动导叶整铸新工艺

介绍盐锅峡水轮机转轮活动导叶整体铸造新工艺。在制定工艺方案时应用计算机辅助工艺设计，采用合理有效的工艺措施，有效地解决了裂纹和缩松问题。     

热流道技术在双层注射模具上的应用

在简要介绍单层热流道注射模具技术的基础上，重点阐述了双层热流道注射模具的基本结构、设计要点、工作原理及应用实例。     

Profiling of bioactive compounds in cultivars of Runner and Valencia peanut market-types using liquid chromatography/APCI mass spectrometry

Peanuts are classified into four market-types (Runners, Spanish, Virginia and Valencia). Studies on their phytochemical composition have focused mainly on market-types other than Valencia. The objectives of this study are to evaluate the phytochemical composition of cultivars of Valencia and Runner market-types. Extracts of 25 peanut cultivars of Runner and Valencia market-types were analysed using HPLC-DAD-MS analysis. Results showed major differences in UV profile of the market-types. A major peak with m/z 317 identified as isorhamnetin was present only in Valencia cultivars while its glycoside (isorhamnetin-3-O-rutinoside) having m/z 625 was identified in both market-types. Genistein, daidzein, rutin, quercetin and trans-resveratrol were also identified and quantified. Genistein and daidzein concentrations (0.03 mg/100 g) were similar in both market-types. trans-Resveratrol and rutin were significantly (p < 0.05) higher in Runner cultivars while quercetin was 10-fold higher (0.60 ± 0.04 mg/100 g) in Valencia cultivars making them a better source of this phytochemical.     

基于Moldflow的时序进料系统在消除熔接痕中的应用

以汽车前保险杠为例,使用Moldflow软件对其进行仿真分析,分析比较了使用热流道多浇口顺序控制系统前后熔接痕状态,结果表明通过时序阀门进料技术可有效地消除或抑制熔接痕,从而达到获得高质量的产品,降低生产成本,缩短产品开发周期的目的.