This study investigates the resistance of a transport ship navigating in level ice by conducting a series of model tests in an ice tank at Tianjin University. The laboratory-scale model ship was mounted on a rigid car...This study investigates the resistance of a transport ship navigating in level ice by conducting a series of model tests in an ice tank at Tianjin University. The laboratory-scale model ship was mounted on a rigid carriage using a one-directional load cell and then towed through an ice sheet at different speeds. We observed the ice-breaking process at different parts of the ship and motion of the ice floes and measured the resistances under different speeds to determine the relationship between the ice-breaking process and ice resistance. The bending failure at the shoulder area was found to cause maximum resistance. Furthermore, we introduced the analytical method of Lindqvist （1989） for estimating ice resistance and then compared these calculated results with those from our model tests. The results indicate that the calculated total resistances are higher than those we determined in the model tests.展开更多
Molecular chaperones are widely employed as additives in nature to trap proteins in the kinetic state,which inspire the development of kinetically trapped artificial supramolecular systems.Till now,such additive-contr...Molecular chaperones are widely employed as additives in nature to trap proteins in the kinetic state,which inspire the development of kinetically trapped artificial supramolecular systems.Till now,such additive-controlled approaches have enabled the stabilization of extended supramolecular structures in the kinetically trapped state,while discrete assemblies with sufficient kinetic persistence are scarce.In this study,a Pt(Ⅱ)-based discrete supramolecular system has been constructed by taking advantage of Cu+-bridged ions as chaperone-like additives.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos. 51179123 and 51279131
文摘This study investigates the resistance of a transport ship navigating in level ice by conducting a series of model tests in an ice tank at Tianjin University. The laboratory-scale model ship was mounted on a rigid carriage using a one-directional load cell and then towed through an ice sheet at different speeds. We observed the ice-breaking process at different parts of the ship and motion of the ice floes and measured the resistances under different speeds to determine the relationship between the ice-breaking process and ice resistance. The bending failure at the shoulder area was found to cause maximum resistance. Furthermore, we introduced the analytical method of Lindqvist （1989） for estimating ice resistance and then compared these calculated results with those from our model tests. The results indicate that the calculated total resistances are higher than those we determined in the model tests.
基金sup-ported by the National Natural Science Foundation of China(nos.21922110,21871245,21674106,and 21704075)the Fundamental Research Funds for the Central Univer-sities(no.WK3450000005)the CAS Youth Innova-tion Promotion Association(no.Y201986).
文摘Molecular chaperones are widely employed as additives in nature to trap proteins in the kinetic state,which inspire the development of kinetically trapped artificial supramolecular systems.Till now,such additive-controlled approaches have enabled the stabilization of extended supramolecular structures in the kinetically trapped state,while discrete assemblies with sufficient kinetic persistence are scarce.In this study,a Pt(Ⅱ)-based discrete supramolecular system has been constructed by taking advantage of Cu+-bridged ions as chaperone-like additives.
