Coupled dynamic response analysis of multi-column floating offshore wind turbine with low center of gravity

To realize the application of the floating offshore wind turbine(FOWT)from deep to relatively shallow waters,a new concept of multi-column floating wind turbine platform with low center of gravity(CG)is designed and validated.The multi-column low CG platform is designed to support a 6MW wind turbine class and operated at a water depth of 50m in the South China Sea.The frequency domain software WADAM and time domain software NREL-FAST are used to simulate coupled dynamic responses of the floating wind turbine system with second-order wave loads considering.The dynamic behaviors of multi-column low CG FOWT system under normal operation and parked conditions are presented.The influence of second-order wave force on the motion responses of the multi-column platform,fore-aft force and moment of the tower base and mooring force are researched respectively.The results demonstrate that the coupled dynamic responses at rated operating condition and extreme condition meet the normal operating requirements and extreme survival requirements of FOWT system in the shallow water(50m)of South China Sea.In addition,it is found that,the wave frequency response gradually replaces the second-order low frequency response as the main influencing factor of the coupled dynamic response of the FOWT system with the increasing severity of the sea states.However,in general,the magnitude of second-order low frequency response increases with the increasing severity of the design load case.Thus,in the subsequent design of the shallow water FOWT system,the second-order effects should be paid enough attention.

Homochiral design of titanium-organic cage for circularly polarized luminescence-based molecular detection

Post-assembly modification strategy is used as an effective approach to improve the functional applications of metal-organic cages. The active vertex of the racemic tetrahedral Ti4L6(L = embonate) cages traps four chiral diamine chelated dinuclear silver ions, obtaining homochiral cages which exhibit helical perovskite stacks. Such a surface modification engineering enables the structural precise cages presenting homochirality and circularly polarized luminescence(CPL) response, further achieving enantioselective recognition toward chiral Camphorquinone molecules and displaying enhanced temperature-dependent effects of CPL output.

Cage-Ligand Strategy for the Construction of Zr_(4)(embonate)6-Based MOFs with Third-Order Nonlinear-Optical Properties

Herein,we demonstrate a very useful strategy to construct cage-based metal-organic frameworks(MOFs)with third-order nonlinear-optical properties.More specifically,by employing the Zr_(4)L_(6)(L=embonate)cages to assembly with N-contained ligands and Mn^(2+)/Zn^(2+) ions,four Zr_(4)L_(6)-cage-based MOFs have been synthesized and structurally characterized.Among them,a 3D framework with strong aromatic π−πstacking force exhibits a good optical limiting effect.