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排序方式: 共有157条查询结果,搜索用时 15 毫秒
81.
Hae Gyeong Kim Gon-Sup Kim Jung Han Lee Semin Park Won Young Jeong Yun-Hi Kim Jae Hoon Kim Soo Taek Kim Young Ah Cho Won Sup Lee Soo Jung Lee Jong Sung Jin Sung Chul Shin 《Food chemistry》2011
A healthy fruit peel of Citrus unshiu Marc. and one infected by Penicillium digitatum were analysed for flavonoids via high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC–MS/MS) in the positive mode with selected ion monitoring (SIM). Among 16 flavonoid components characterised in C. unshiu Marc., four flavanones and nine flavones were identified for the first time. The identified compounds were quantified by HPLC–UV. To investigate the function of the flavonoids as defence materials, the flavonoid content change of the fruit peel inoculated with P. digitatum was monitored by HPLC. The flavonoid concentration in the infected fruit peel decreased initially after the infection and then gradually increased before finally progressively decreasing. 相似文献
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Yong Yu Chunyan Meng 《北京科技大学学报(英文版)》2005,12(6):495-499
It is claimed that the formula used for calculating the tensile strength of a disk-shaped rock specimen in the Brazilian test is not accurate, because the formula is based on the 2-dimensional elastic theory and only suitable for very long or very short cylinders. The Matlab software was used to obtain the 2-dimensional distribution of stress in the rock specimen for Brazilian test. Then the 2-dimensional stress distribution in Brazilian disk was analyzed by the Marc FEM software. It can be found that the results obtained by the two software packages can verify each other. Finally, the 3-dimensional elastic stress in the specimen was calculated. The results demonstrate that the distribution of stress on the cross section of the specimen is similar to that in 2-dimension. However, the value of the stress on the cross section varies along the thickness of the specimen and the stress is bigger when getting closer to the end of the specimen. For the specimen with a height-to-diameter ratio of 1 and a Poisson's ratio of 0.25, the tensile strength calculated with the classical 2-D formula is 23.3% smaller than the real strength. Therefore, the classical 2-D formula is too conservative. 相似文献
84.
大型转炉倾动机构扭力杆有限元分析 总被引:1,自引:0,他引:1
应用有限单元法对大型转炉倾动装置的重要部件扭力杆进行应力应变分析,通过对正常工作状态和事故状态两种工况下扭力杆的变形及最大剪应力状态分析,确定出变截面扭力杆的强度,为产品设计提供依据. 相似文献
85.
应用有限元分析理论对钢板仓输料桁架进行动力分析,得到输料桁架的应力分布和位移变化过程图. 通过分析,能对钢板仓输料桁架的结构设计提供有益的参考. 相似文献
86.
应用运用MSC Marc对制动块进行接触分析,得到其应力分布云图和接触状态云图,在此基础上进行结构优化,使之受力分散、接触均匀. 相似文献
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利用大型有限元软件MSC.Marc,建立了弧齿锥齿轮副三齿啮合的三维有限元非线性接触模型.该模型可以实现转速和转矩的传递,基于该模型对齿轮副进行了准静态啮合仿真分析,并对啮合过程中的齿面接触应力及齿根弯曲应力变化规律进行了研究.数值计算结果符合弧齿锥齿轮的实际啮合规律,为进一步分析高速情况下弧齿锥齿轮的啮合状态提供了基础和依据. 相似文献