Aerodynamic performance of the high-altitude propeller, especially the counter rotation effects, is ex- perimentally studied. Influences of different configurations on a stratospheric airship, included 2-blade counter...Aerodynamic performance of the high-altitude propeller, especially the counter rotation effects, is ex- perimentally studied. Influences of different configurations on a stratospheric airship, included 2-blade counter-rotating propeller （CRP）, dual 2-blade single rotation propellers （SRPs） and 4-blade SRP, are also indicated. This research indicates that the effect of counter rotation can greatly improve the efficiency. It shows that the CRP configuration results in a higher efficiency than the dual 2-blade SRPs configuration or 4-blade SRP configuration under the same advance ratio, and the CRP configuration also gains the highest efficiency whether under the situation of providing the same trust or absorbing the same power. It con- cludes that, for a stratospheric airship, the CRP configuration is better than the multiple SRPs configuration or a multi-blade SRP one.展开更多
Non-alcoholic Fatty Liver Disease(NAFLD)is becoming the leading cause of chronic liver injury in developed countries and China.Chronic systemic inflammation plays a decisive role and is fundamental in the progression ...Non-alcoholic Fatty Liver Disease(NAFLD)is becoming the leading cause of chronic liver injury in developed countries and China.Chronic systemic inflammation plays a decisive role and is fundamental in the progression of NAFLD from simple steatosis(SS)toward higher risk nonalcoholic steatohepatitis(NASH)states.However,the exact mechanisms by which inflammation leading to NASH are incompletely understood.In this review,we focus the role of the cross talk between inflammation and lipid homeostasis on the progression of NAFLD.展开更多
The brittleness index plays a significant role in the hydraulic fracturing design and wellbore stability analysis of shale reservoirs.Various brittleness indices have been proposed to characterize the brittleness of s...The brittleness index plays a significant role in the hydraulic fracturing design and wellbore stability analysis of shale reservoirs.Various brittleness indices have been proposed to characterize the brittleness of shale rocks,but almost all of them ignored the anisotropy of the brittleness index.Therefore,uniaxial compression testing integrated with geophysical logging was used to provide insights into the anisotropy of the brittleness index for Longmaxi shale,the presented method was utilized to assess brittleness index of Longmaxi shale formation for the interval of 3155e3175 m in CW-1 well.The results indicated that the brittleness index of Longmaxi shale showed a distinct anisotropy,and it achieved the minimum value at β=45°-60°.As the bedding angle increased,the observed brittleness index(BI_(2_β))decreased firstly and increased then,it achieved the lowest value at β=40°-60°,and it is consistent with the uniaxial compression testing results.Compared to the isotropic brittleness index(β=0°),the deviation of the anisotropic brittleness index ranged from 10%to 66.7%,in other words,the anisotropy of brittleness index cannot be ignored for Longmaxi shale.Organic matter content is one of the main intrinsic causes of shale anisotropy,and the anisotropy degree of the brittleness index generally increases with the increase in organic matter content.The present work is valuable for the assessment of anisotropic brittleness for hydraulic fracturing design and wellbore stability analysis.展开更多
文摘Aerodynamic performance of the high-altitude propeller, especially the counter rotation effects, is ex- perimentally studied. Influences of different configurations on a stratospheric airship, included 2-blade counter-rotating propeller （CRP）, dual 2-blade single rotation propellers （SRPs） and 4-blade SRP, are also indicated. This research indicates that the effect of counter rotation can greatly improve the efficiency. It shows that the CRP configuration results in a higher efficiency than the dual 2-blade SRPs configuration or 4-blade SRP configuration under the same advance ratio, and the CRP configuration also gains the highest efficiency whether under the situation of providing the same trust or absorbing the same power. It con- cludes that, for a stratospheric airship, the CRP configuration is better than the multiple SRPs configuration or a multi-blade SRP one.
基金This study was supported by Major State Basic Research Development Program of China(973 Program,NO.2012CB517700&2012CB517500)the National Natural Science Foundation of China(81270493,81270789,81200567 and Key Program,No.81030008,81390354)the Moorhead Trust,the Royal Free Hospital Special Trustees Grant-115 through Dr.Zac Varghese,and Kidney Research UK(RP37/2008).
文摘Non-alcoholic Fatty Liver Disease(NAFLD)is becoming the leading cause of chronic liver injury in developed countries and China.Chronic systemic inflammation plays a decisive role and is fundamental in the progression of NAFLD from simple steatosis(SS)toward higher risk nonalcoholic steatohepatitis(NASH)states.However,the exact mechanisms by which inflammation leading to NASH are incompletely understood.In this review,we focus the role of the cross talk between inflammation and lipid homeostasis on the progression of NAFLD.
基金supported by the post-doctoral project of Petrochina Southwest Oil&Gas Field Company“Research on Deep Shale Geomechanics and Effective Fracturing Factors”(Grant No.20210302-31)the Program of Introducing Talents of Discipline to Chinese Universities(111 Plan)(Grant No.D18016)+2 种基金the Sichuan Science and Technology Program(Grant No.2020JDJQ0055)the Nanchong-SWPU Science and Technology Strategic Cooperation Foundation(Grant No.SXHZ033)the Youth Scientific and Technological Innovation Team Foundation of SWPU(Grant No.2019CXTD09).
文摘The brittleness index plays a significant role in the hydraulic fracturing design and wellbore stability analysis of shale reservoirs.Various brittleness indices have been proposed to characterize the brittleness of shale rocks,but almost all of them ignored the anisotropy of the brittleness index.Therefore,uniaxial compression testing integrated with geophysical logging was used to provide insights into the anisotropy of the brittleness index for Longmaxi shale,the presented method was utilized to assess brittleness index of Longmaxi shale formation for the interval of 3155e3175 m in CW-1 well.The results indicated that the brittleness index of Longmaxi shale showed a distinct anisotropy,and it achieved the minimum value at β=45°-60°.As the bedding angle increased,the observed brittleness index(BI_(2_β))decreased firstly and increased then,it achieved the lowest value at β=40°-60°,and it is consistent with the uniaxial compression testing results.Compared to the isotropic brittleness index(β=0°),the deviation of the anisotropic brittleness index ranged from 10%to 66.7%,in other words,the anisotropy of brittleness index cannot be ignored for Longmaxi shale.Organic matter content is one of the main intrinsic causes of shale anisotropy,and the anisotropy degree of the brittleness index generally increases with the increase in organic matter content.The present work is valuable for the assessment of anisotropic brittleness for hydraulic fracturing design and wellbore stability analysis.
