In order to imitate biological addesion performance nd skin properties,phase transitions on dielectric elastomers(D E)with high voltages are studied.The states of flat,rinkled and bulging on the circular active area w...In order to imitate biological addesion performance nd skin properties,phase transitions on dielectric elastomers(D E)with high voltages are studied.The states of flat,rinkled and bulging on the circular active area which is coated w th electrodes verify the theoretical prediction of phase transitions and failure phenomena.When the DE membrane is subjected to a radial force and increasing voltage,four experimental phenomena are discovered before electric breakdown:The active region expands,and the thin membrane is still flat till breakdown;bulging forms instead of a fa t area on the membrane;wrinkes and bulging coexist;and the active aea is completely wrinlded there are two types of phase transitions between the fa t andwrinded regions in a membrane:Wrinkles form in small regions,and te n propagate at the expense of t e flat area until he entire active part becomes wrinded;b o t the wrinded a d flat regions move interchangeably on a membrane with ramping voltage till breakdown.It is found that when Aere is no prestretch of a DE membrane,bulging w ill occur with te increasing voltage.Wrinkles commonly appear at large prestretch and,terefore,the prestetched ratio significantly affects electomechanical phase tansitions.展开更多
Factors of shale gas accumulation can be divided into the external and internal factors,according to accumulation mechanism and characteristics of shale gas. The internal factors mainly refer to parameters of organic ...Factors of shale gas accumulation can be divided into the external and internal factors,according to accumulation mechanism and characteristics of shale gas. The internal factors mainly refer to parameters of organic geochemistry,mineral components and physical parameters. Six factors were presented in this study,i. e.organic matter,maturity,quartz,carbonate,clay mineral and pore. The external factors mainly refer to geologic environment of shale gas reservoir,including four factors: temperature,pressure,depth and thickness.Based on the experiment results of 26 samples of drilling cores from Wuling fold belt in Lower Paleozoic Silurian of the Upper Yangtze Basin,combined with the integrated analysis of geology,logging and test,the correlation of the gas content of shale gas to the above-mentioned ten factors was concluded. Six important evaluation indicators were preliminarily established in the gas-bearing core area of marine shale in the Upper Yangtze Basin.展开更多
Let V be a smooth projective 3-fold of general type. We show that the canonical volume K3 of V has a lower bound 1/10 provided q（V） 〉 0 and Ka ≥ 3 provided P4（V） ≥ 5. We also give some clean and better form for...Let V be a smooth projective 3-fold of general type. We show that the canonical volume K3 of V has a lower bound 1/10 provided q（V） 〉 0 and Ka ≥ 3 provided P4（V） ≥ 5. We also give some clean and better form for Noether inequalities for minimal 3-folds of general type.展开更多
基金The National Natural Science Foundation of China No.51775108)
文摘In order to imitate biological addesion performance nd skin properties,phase transitions on dielectric elastomers(D E)with high voltages are studied.The states of flat,rinkled and bulging on the circular active area which is coated w th electrodes verify the theoretical prediction of phase transitions and failure phenomena.When the DE membrane is subjected to a radial force and increasing voltage,four experimental phenomena are discovered before electric breakdown:The active region expands,and the thin membrane is still flat till breakdown;bulging forms instead of a fa t area on the membrane;wrinkes and bulging coexist;and the active aea is completely wrinlded there are two types of phase transitions between the fa t andwrinded regions in a membrane:Wrinkles form in small regions,and te n propagate at the expense of t e flat area until he entire active part becomes wrinded;b o t the wrinded a d flat regions move interchangeably on a membrane with ramping voltage till breakdown.It is found that when Aere is no prestretch of a DE membrane,bulging w ill occur with te increasing voltage.Wrinkles commonly appear at large prestretch and,terefore,the prestetched ratio significantly affects electomechanical phase tansitions.
文摘Factors of shale gas accumulation can be divided into the external and internal factors,according to accumulation mechanism and characteristics of shale gas. The internal factors mainly refer to parameters of organic geochemistry,mineral components and physical parameters. Six factors were presented in this study,i. e.organic matter,maturity,quartz,carbonate,clay mineral and pore. The external factors mainly refer to geologic environment of shale gas reservoir,including four factors: temperature,pressure,depth and thickness.Based on the experiment results of 26 samples of drilling cores from Wuling fold belt in Lower Paleozoic Silurian of the Upper Yangtze Basin,combined with the integrated analysis of geology,logging and test,the correlation of the gas content of shale gas to the above-mentioned ten factors was concluded. Six important evaluation indicators were preliminarily established in the gas-bearing core area of marine shale in the Upper Yangtze Basin.
基金supported by the Innovation Team Foundation of the Department of Education of Zhejiang Province(Grant No.T200924)
文摘Let V be a smooth projective 3-fold of general type. We show that the canonical volume K3 of V has a lower bound 1/10 provided q（V） 〉 0 and Ka ≥ 3 provided P4（V） ≥ 5. We also give some clean and better form for Noether inequalities for minimal 3-folds of general type.
