In order to analyze the hydrodynamic performance of the ducted propeller with high precision, this paper proposes a new method which combines Multi-Block Hybrid Mesh and Reynolds Stress Model (MBHM & RSM). The cal...In order to analyze the hydrodynamic performance of the ducted propeller with high precision, this paper proposes a new method which combines Multi-Block Hybrid Mesh and Reynolds Stress Model (MBHM & RSM). The calculation errors of MBHM & RSM and standard two-equation model (standard k-ε model) on the ducted propeller JD7704 +Ka4-55 are compared. The maximum error of the total thrust coefficient KT, the duct thrust coefficient KTN, the torque coefficient KQ and the open-water efficiency η0 of MBHM & RSM are 2.98%, 4.01%, 1.46%, and 0.89%, respectively, which are lower than those of standard k-ε model. Indeed, the pressure distribution on the propeller surfaces, the pressure and the velocity vector distribution of the flow field are also analyzed, which are consistent with the theory. It is demonstrated that MBHM & RSM on the thruster dynamics analysis are feasible. This paper provides reference in the thruster designing of underwater robot.展开更多
Acute lung injury(ALI)linked to sepsis has a high mortality rate,with limited treatment options available.In recent studies,medical ozone has shown the potential to alleviate inflammation and infection.Here,we aimed t...Acute lung injury(ALI)linked to sepsis has a high mortality rate,with limited treatment options available.In recent studies,medical ozone has shown the potential to alleviate inflammation and infection.Here,we aimed to evaluate therapeutic potential of medical ozone in a mouse model of the sepsis-induced ALI by measuring behavioral assessments,lung function,and blood flow.Protein levels were quantified by Western blotting.In vitro,we performed experiments on bone marrow-derived macrophages(BMDMs)to investigate the effect of adenosine monophosphate(AMP)-activated protein kinase(AMPK)inhibitors and agonists on their phagocytic activity.The results showed that medical ozone significantly improved the survival rate,ameliorated lung injury,and enhanced lung function and limb microcirculation in mice with ALI.Notably,medical ozone inhibited the formation of neutrophil extracellular traps(NETs),a crucial factor in the ALI development.Additionally,medical ozone counteracted the elevated levels of tissue factor,matrix metalloproteinase-9,and interleukin-1β.In the ALI mice,the effects of ozone were abolished,and BMDMs showed an impaired capacity to engulf NETs following the Sr-a1 knockout.Under normal physiological conditions,the administration of an AMPK antagonist showed similar effects on the Sr-a1 knockout,significantly inhibiting the phagocytosis of NETs by BMDMs.In contrast,AMPK agonists enhanced this phagocytic process.In conclusion,medical ozone may alleviate the sepsis-induced lung injury through the AMPK/SR-A1 pathway,thereby enhancing the phagocytosis of NETs by macrophages.展开更多
The preparation of bioactive materials with good film-forming properties has become a hot research topic nowadays in recent years.In this study,an edible protein film with good mechanical and barrier properties was ma...The preparation of bioactive materials with good film-forming properties has become a hot research topic nowadays in recent years.In this study,an edible protein film with good mechanical and barrier properties was made from soybean protein isolate(SPI)in terms of physical modification.Specifically,the SPI was treated by dielectric barrier discharge cold plasma(DBD-CP)via modified atmosphere packaging(MAP).The effects of oxygen content in MAP on the structure SPI as well as its edible film surface microstructure,mechanical properties,barrier properties and opacity were all investigated.The results showed that the particle size of SPI gradually decreased with the increase of oxygen content.In addition,the surface of the resulting film became smoother and more detailed.At the same time,the elongation at break(EB),water vapor performance(WVP)and opacity of the edible film were significantly improved(p<0.05).The functional properties of the edible film were most significantly improved when the oxygen content was 50%.Compared with control samples,the EB of the film and water contact angle increased by 122.60%and 47.70%,while the WVP and opacity decreased by 19.28%and 27.40%,respectively.Therefore,the MAP-assisted DBD-CP method has the potential of modification of edible protein film with good functional properties and facilitates the application of edible SPI film in various fields.展开更多
文摘In order to analyze the hydrodynamic performance of the ducted propeller with high precision, this paper proposes a new method which combines Multi-Block Hybrid Mesh and Reynolds Stress Model (MBHM & RSM). The calculation errors of MBHM & RSM and standard two-equation model (standard k-ε model) on the ducted propeller JD7704 +Ka4-55 are compared. The maximum error of the total thrust coefficient KT, the duct thrust coefficient KTN, the torque coefficient KQ and the open-water efficiency η0 of MBHM & RSM are 2.98%, 4.01%, 1.46%, and 0.89%, respectively, which are lower than those of standard k-ε model. Indeed, the pressure distribution on the propeller surfaces, the pressure and the velocity vector distribution of the flow field are also analyzed, which are consistent with the theory. It is demonstrated that MBHM & RSM on the thruster dynamics analysis are feasible. This paper provides reference in the thruster designing of underwater robot.
基金supported by the National Natural Science Foundation of China(Grant Nos.82271252,82204542,and 81971047)the Lianyungang Science and Technology Program Project(Grant Nos.SF2122 and SF2214)+2 种基金the Scientific Research Project of Jiangsu Provincial Health Commission(Grant No.Z2021066)the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(Grant No.21KJB310019)the Open Project of Jiangsu Province Key Laboratory of Anesthesiology,Xuzhou Medical University(Grant No.XZSYSKF2021014).
文摘Acute lung injury(ALI)linked to sepsis has a high mortality rate,with limited treatment options available.In recent studies,medical ozone has shown the potential to alleviate inflammation and infection.Here,we aimed to evaluate therapeutic potential of medical ozone in a mouse model of the sepsis-induced ALI by measuring behavioral assessments,lung function,and blood flow.Protein levels were quantified by Western blotting.In vitro,we performed experiments on bone marrow-derived macrophages(BMDMs)to investigate the effect of adenosine monophosphate(AMP)-activated protein kinase(AMPK)inhibitors and agonists on their phagocytic activity.The results showed that medical ozone significantly improved the survival rate,ameliorated lung injury,and enhanced lung function and limb microcirculation in mice with ALI.Notably,medical ozone inhibited the formation of neutrophil extracellular traps(NETs),a crucial factor in the ALI development.Additionally,medical ozone counteracted the elevated levels of tissue factor,matrix metalloproteinase-9,and interleukin-1β.In the ALI mice,the effects of ozone were abolished,and BMDMs showed an impaired capacity to engulf NETs following the Sr-a1 knockout.Under normal physiological conditions,the administration of an AMPK antagonist showed similar effects on the Sr-a1 knockout,significantly inhibiting the phagocytosis of NETs by BMDMs.In contrast,AMPK agonists enhanced this phagocytic process.In conclusion,medical ozone may alleviate the sepsis-induced lung injury through the AMPK/SR-A1 pathway,thereby enhancing the phagocytosis of NETs by macrophages.
基金National Key Research and Development Program of China for Young Scientists(2022YFF1102600)National Natural Science Foundation of China(32172306 and 32101618)+3 种基金QingLan Project and Youth Science Fund of Jiangsu Province(BK20200832 and BK20211291)Youth Top Talents in Grain Industry of China(QN2022205)Key Research and Development Program of Jiangsu and Zhejiang Province(BE2023347 and 2022C02020)A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).
文摘The preparation of bioactive materials with good film-forming properties has become a hot research topic nowadays in recent years.In this study,an edible protein film with good mechanical and barrier properties was made from soybean protein isolate(SPI)in terms of physical modification.Specifically,the SPI was treated by dielectric barrier discharge cold plasma(DBD-CP)via modified atmosphere packaging(MAP).The effects of oxygen content in MAP on the structure SPI as well as its edible film surface microstructure,mechanical properties,barrier properties and opacity were all investigated.The results showed that the particle size of SPI gradually decreased with the increase of oxygen content.In addition,the surface of the resulting film became smoother and more detailed.At the same time,the elongation at break(EB),water vapor performance(WVP)and opacity of the edible film were significantly improved(p<0.05).The functional properties of the edible film were most significantly improved when the oxygen content was 50%.Compared with control samples,the EB of the film and water contact angle increased by 122.60%and 47.70%,while the WVP and opacity decreased by 19.28%and 27.40%,respectively.Therefore,the MAP-assisted DBD-CP method has the potential of modification of edible protein film with good functional properties and facilitates the application of edible SPI film in various fields.
