The absorber is the key unit in the post-combustion monoethanolamine(MEA)-based carbon dioxide(CO_(2))capture process.A rate-based dynamic model for the absorber is developed and validated using steady-state experimen...The absorber is the key unit in the post-combustion monoethanolamine(MEA)-based carbon dioxide(CO_(2))capture process.A rate-based dynamic model for the absorber is developed and validated using steady-state experimental data reported in open literature.Sensitivity analysis is performed with respect to important model parameters associated with the reaction,mass transport and phy-sical property relationships.Then,a singular value decomposition(SVD)-based subspace parameter estimation method is proposed to improve the model accu-racy.Finally,dynamic simulations are carried out to investigate the effects of the feed rate of lean MEA solution and the flue inlet conditions.Simulation results indicate that the established dynamic model can reasonably reflect the physical behavior of the absorber.Some new insights are gained from the simulation results.展开更多
A well-conditioned spectral integration(SI)method is introduced,developed and applied to nth-order differential equations with variable coefficients and general boundary conditions.The approach is based on integral re...A well-conditioned spectral integration(SI)method is introduced,developed and applied to nth-order differential equations with variable coefficients and general boundary conditions.The approach is based on integral reformulation techniques which lead to almost banded linear matrices,and the main system to be solved is further banded by utilizing a Schur complement approach.Numerical experiments indicate the spectral integration method can solve high order equations efficiently,oscillatory problems accurately and is adaptable to large systems.Applications in Korteweg-de Vries(KdV)type and Kawahara equations are carried out to illustrate the proposed method is effective to complicated mathematical models.展开更多
Lentinus edodes(L.edodes)is a popular edible mushroom,which is very easy to rot and deteriorate after harvest.The quality of L.edodes were significantly affected by different packaging materials.Hence,polypropylene(PP...Lentinus edodes(L.edodes)is a popular edible mushroom,which is very easy to rot and deteriorate after harvest.The quality of L.edodes were significantly affected by different packaging materials.Hence,polypropylene(PP)or polyethylene(PE)packaging were employed to explore the effects and underlying mechanisms on the post-harvested quality of L.edodes.Compared with PE packaging,PP packaging could maintain good storage quality and membrane integrity of L.edodes by reducing oxidative damage,which might be related to the significantly decreased relative electrolyte leakage and malondialdehyde content at the later stage of storage.Also,PP packaging could improve the antioxidant ability and inhibit the production of H_(2)O_(2)by the decreased catalase and increased superoxide dismutase content.Phenylalanine ammonia lyase,phenylalanine ammonia lyase and cinnamaldehyde dehydrogenase,as the key enzymes in the metabolic pathway of phenylpropane,increased at the later storage of PP-packaged L.edodes.It helped the synthesis of phenolic substances and lignin accumulation.These results indicated PP packaging could be an effective material for maintaining the postharvest storage quality of L.edodes,which might be related to the antioxidant system and phenylpropane pathway.展开更多
基金The work was financially supported by Basic Public Welfare research Plan of Zhejiang Province(LGG19F030006)Key Laboratory of Intelligent Manufacturing Quality Big Data Tracing and Analysis of Zhejiang Province,China Jiliang University(Grant No.ZNZZSZ–CJLU2022–04)the Key Research and Development Program of Ningbo(2022Z165).
文摘The absorber is the key unit in the post-combustion monoethanolamine(MEA)-based carbon dioxide(CO_(2))capture process.A rate-based dynamic model for the absorber is developed and validated using steady-state experimental data reported in open literature.Sensitivity analysis is performed with respect to important model parameters associated with the reaction,mass transport and phy-sical property relationships.Then,a singular value decomposition(SVD)-based subspace parameter estimation method is proposed to improve the model accu-racy.Finally,dynamic simulations are carried out to investigate the effects of the feed rate of lean MEA solution and the flue inlet conditions.Simulation results indicate that the established dynamic model can reasonably reflect the physical behavior of the absorber.Some new insights are gained from the simulation results.
文摘A well-conditioned spectral integration(SI)method is introduced,developed and applied to nth-order differential equations with variable coefficients and general boundary conditions.The approach is based on integral reformulation techniques which lead to almost banded linear matrices,and the main system to be solved is further banded by utilizing a Schur complement approach.Numerical experiments indicate the spectral integration method can solve high order equations efficiently,oscillatory problems accurately and is adaptable to large systems.Applications in Korteweg-de Vries(KdV)type and Kawahara equations are carried out to illustrate the proposed method is effective to complicated mathematical models.
基金supported by the National Natural Science Foundation of China(32001811,32302631,31772020)Guangdong Basic and Applied Basic Research Foundation(2023A1515011834).
文摘Lentinus edodes(L.edodes)is a popular edible mushroom,which is very easy to rot and deteriorate after harvest.The quality of L.edodes were significantly affected by different packaging materials.Hence,polypropylene(PP)or polyethylene(PE)packaging were employed to explore the effects and underlying mechanisms on the post-harvested quality of L.edodes.Compared with PE packaging,PP packaging could maintain good storage quality and membrane integrity of L.edodes by reducing oxidative damage,which might be related to the significantly decreased relative electrolyte leakage and malondialdehyde content at the later stage of storage.Also,PP packaging could improve the antioxidant ability and inhibit the production of H_(2)O_(2)by the decreased catalase and increased superoxide dismutase content.Phenylalanine ammonia lyase,phenylalanine ammonia lyase and cinnamaldehyde dehydrogenase,as the key enzymes in the metabolic pathway of phenylpropane,increased at the later storage of PP-packaged L.edodes.It helped the synthesis of phenolic substances and lignin accumulation.These results indicated PP packaging could be an effective material for maintaining the postharvest storage quality of L.edodes,which might be related to the antioxidant system and phenylpropane pathway.
