基于熵权-逼近理想解排序法结合体外模拟消化评价功能性水稻品质

目的 探究不同品种功能性水稻的品质差异性指标,并进行综合品质评价。方法 以来源于咸宁市农业科学院的7种功能性水稻为研究对象,对其7项基本营养成分、9种矿物质元素含量、3类淀粉含量和1种血糖预测指数共计20项营养品质指标进行对比分析,在利用正交偏最小二乘法-判别分析(orthogonal partial least-squaresdiscriminationanalysis,OPLS-DA)筛选重要差异性指标的基础上,建立熵权-逼近理想解排序法(technique for order preference by similarity to ideal solution, TOPSIS)模型对7种功能性水稻的综合品质进行评价。结果 不同品种功能性水稻的基本营养成分在较小范围内波动,但钾元素含量和淀粉含量的变化范围较大,其中水稻GN 7、GN 5、GN 6在钾元素含量方面表现较好,水稻GN 4、GN 1、GN 3抗性淀粉含量最高,预估血糖生成指数(estimated glycemic index, eGI)值更低,抗消化能力优于其他品种。OPLS-DA分析筛选出锌、钠、钾、抗性淀粉、钙、镁、...     

凸轮机构磨损数值仿真软件研制

根据零件磨损过程一般数值仿真方法 ,以凸轮机构为研究对象 ,开发出不同类型凸轮磨损仿真软件 ,可实现不同极根条件下的凸轮磨损寿命预测、参数优化和状态监测等功能。     

519法兰铝铸件的低压铸造

519法兰壳体是大型回转体结构的气密性铸件,其外形尺寸为680mm×364mm,通过低压铸造的生产实践表明,在模具温度为300～350℃,充型压力为0.3MPa,充型时间为20s,保压压力为0.8MPa,保压时间为120s的条件下,可生产出优良铸件,工艺出品率由砂型铸造的50%提高到75%以上,铸件一次气密性检漏合格率达98%以上。由于铸件加工量比砂型铸造工艺减少了5%以上,铸件质量由52kg降低到36kg,每件减轻了16kg,仅此项每年可节约30万元。     

Effect of modified resistant starch of culinary banana on physicochemical,functional, morphological,diffraction, and thermal properties

Resistant starch has received much attention for both its potential health benefits and functional properties. The present study revealed that the culinary banana can be a potential source for production of resistant starch type III. The results showed that resistant starch yield can be increased using debranching enzyme (Pullulanase EC 3.2.1.41) and hydrothermal process. The three repeated autoclaving and cooling (hydrothermal) cycles followed by storage at –20ºC, increased the resistant starch yield from 12.3 to 26.4%. The use of debranching enzyme and subsequent retrogradation at –20ºC increased the resistant starch yield up to 31.2%. The modified resistant starch when compared to culinary banana starch evinced better stability. The modified resistant starch was analyzed using scanning electron microscopy, Fourier transform infrared, x-ray diffraction, and thermogravimetric diffraction analysis to determine the structural changes which proved that the modification occurred substantially.     

一种新型的高耐热、高阻燃、低介电损耗的热固性树脂的开发

文章介绍了马来酰亚胺与三嗪环改性的酚醛树脂通过MICHAEL加成反应形成的新型热固性树脂。这种新型热固性树脂与环氧树脂一起形成了二元共混体系,这个二元共混体系应用于覆铜板,使得覆铜板具有高耐热、高阻燃、低介电损耗的特点,而且机械性能和吸湿后耐焊性有很好的平衡。     

Increasing Resistant Starch Content in Fish Crackers Through Repetitive Cooking-Chilling Cycles

This work describes the effect of a repetitive cooking-chilling process on resistant starch content in crackers prepared from a mixture of fish and starch, which are popularly known in Malaysia as “keropok.” Three fish cracker formulations were prepared using tapioca, wheat, and sago starch. Up to four cycles of repetitive cooking-chilling increased the resistant starch content in all products; however, the hardness of chilled samples decreased, and their moisture content increased. For the fried samples, the texture became harder, the color turned darker, and linear expansion was reduced. The dried fish cracker samples prepared with sago starch yielded the highest resistant starch content. The results demonstrated that four cycles of repetitive cooking-chilling were able to enhance resistant starch in fish crackers.     

抗磨钢的最新进展

综述了抗磨钢包括奥氏体锰钢，低合金马氏体钢和贝氏体钢的最新研究进展，通过分析各种抗磨钢的组织，性能以及应用工况和环境，指出了抗磨钢的发展方向。     

Proliferation resistance properties of u and Pu isotopes

The present study provides a quantitative basis for assessment of proliferation resistance properties of U and Pu isotopes.

Within the large area of issues covered by term of proliferation resistance, the only technical characteristics were chosen as a subject for discussion. The present study concentrates on intrinsic proliferation resistance features focusing the material characteristics associated with bare critical mass (BCM), decay heat (DH) and spontaneous-fission neutrons (SFN), which are treated as the main constituents of isotopic barriers against proliferation. The present study aims at determining major proliferation resistant attributes for U and Pu. This determination is largely based on analysis of their critical bare spheres. The MCNP code coupled with JENDL 3.2 data library is the main tool applied for this study. The other characteristics were summarized from the data available in scientific literature.     

高强耐磨钢刨削加工工艺研试

通过优选刀具材料和模拟工况的切削试验,确定高强耐磨钢系列材料的机械加工可行性,并对工艺参数进行优化,从而达到经济合理的加工.     

In vitro starch bioavailability of corn tortillas with hydrocolloids

Tortillas were prepared using commercial hydrocolloids, stored for 7 and 14 days and their available, resistant and retrograded resistant starches, were evaluated alongside their in vitro starch digestibility. Available starch (AS) decreased with storage time and tortillas with hydrocolloids had lower values than the control sample. Tortillas elaborated with TC-20 gum did not present substantial differences in AS. Control tortilla had resistant starch (RS) content that increased with storage time but, in general, tortillas with hydrocolloids did not show any change in RS values with storage time, except tortillas with TC-1 gum that presented a slight increase after 7 storage days. Approximately 50% of RS is due to the retrogradation phenomenon as it was shown by the amount of retrograded resistant starch (RRS). Tortillas with added hydrocolloids had lower hydrolysis percentage and the hydrolysis was slower than in the control. In general, tortillas prepared with hydrocolloids had a lower tendency for retrogradation than control tortillas; it is important to consider this to obtain tortillas with better texture and lower RS content.