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Aiming at the problems of poor generalization ability and low accuracy of remain useful life prediction of rolling bearings under different working conditions and different faults, this paper proposed a remain useful life prediction method based on Siamese multi-convolutional long short-term memory (S-MCISTM) and domain adversarial neural network (DANN). Firstly, to reduce the influence of different working conditions on the degradation process, it input two samples with a certain time interval to the S-MCLSTM differentiation feature extractor to extract the differentiated features. At the same time, it designed and trained the work condition discriminator adversarially with the feature extractor, which could avoid to extract redundant features due to different working conditions. Then, to reduce the influence of different faults on the degradation process, it designed and trained a fault diagnoser adversarially with the differentiation feature extractor. Finally, considering the differences in the mapping between degradation process and features in different degradation stages, it proposed a stage discriminator and applied different remain useful life predictors in different stages. In the end, experiments on the XJTU-SY bearing dataset show that the method can accurately predict the remain useful life under various working conditions and faults, and has a wide range of application scenarios. [ABSTRACT FROM AUTHOR]

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There are 4 main types of N-alkylamides in Anacyclus pyrethrum DC., namely, isobutylamide (IBA), N-Me isobutylamide (N-Me IBA), 2-phenylethylamide (2-PEA) and 4-hydroxyphenylethylamide (4-OH PEA). However, there was very few research on the fragmentation pathways of N-alkylamides by now. In order to obtain accurate and comprehensive information about the fragmentation pathways of N-alkylamides, 5 kinds of N-alkylamides were analyzed by HPLC-ESI-MSn. They are identified as deca-2E, 4E-dienoicacid isobutylamideylamide, undeca-2E, 4E-diene-8, 10-diynoic acid phenylethylamide, deca-2E, 4E-dienoicacid 4-hydroxyphenylethlamide, dodeca-2E, 4E-dienoicacid 4-hydroxyphenyl-ethylamide and tetradeca-2E, 4E-dienoic acid 4-hydroxyphenylethylamide. Multi-stage mass spectrum diagrams of five N-alkylamides were obtained in positive ion mode. Simultaneously, the method of quantum computational chemistry was adopted to verify their fragmentation pathways. Characteristic fragment ions were identified and the patterns were deduced further. The fragmentation patterns and structural assignment of ‘isobutylamides (IBA)' type, ‘2-phenylethylamide(2-PEA)' type and ‘4-hydroxyphenylethyl-amides (4-OH PEA)' type in ESI-MSn under positive ion mode were summarized. The results show that five N-alkylamides have the similar fragmentation pathway, ［M+H］+ is prone to α-cracking in N-position at the first, loss of 28(CO), 18(H2O) subsequently. These compounds have strong pyrolysis rules and the study can provide reference for N-alkylamides in structural identification and quantitative analysis. [ABSTRACT FROM AUTHOR]