For a special use a new modelling method of evaluating external disturbing potential is presented in this paper.Being different from classical methods in physical geodesy this method is grounded upon the theory of uni...For a special use a new modelling method of evaluating external disturbing potential is presented in this paper.Being different from classical methods in physical geodesy this method is grounded upon the theory of unified representation of gravitational field.The models created in this way are particularly satisfactory for a high_speed computation of gravitational field in low altitude because they take account of topographic effects and have their kernel functions with simple structure and weak singularity.展开更多
Achieving molecular self-assembly to produce functional supramolecular polymers with defined dimensions and structural periodicity is crucial,particularly for two-dimensional supramolecular polymers(2DSPs).However,a m...Achieving molecular self-assembly to produce functional supramolecular polymers with defined dimensions and structural periodicity is crucial,particularly for two-dimensional supramolecular polymers(2DSPs).However,a major challenge to their application has been poor electrical conductivity due to weakπ-electron delocalization in existing synthetic methods.Here,we overcome this limitation by demonstrating the controlled construction of conductive 2DSPs through self-aligned brick-like stacking of doubly chargedπ-conjugated monomers driven by aromatic cation-πinteractions.A key feature of this approach is the upright molecular orientation,a notable departure from the horizontal orientation typical of conventional 2D polymers.This versatile method is compatible with various molecular building blocks,enabling modulation of 2DSP conformation from flat to wavy.We have also prepared free-standing single-layer nanosheets of 2DSPs via solution-assisted exfoliation from their crystals.The resulting 2DSPs demonstrate efficient in-planeπ-electron delocalization,leading to impressive electrical conductivity properties,holding significant promise for optoelectronic applications.展开更多
文摘For a special use a new modelling method of evaluating external disturbing potential is presented in this paper.Being different from classical methods in physical geodesy this method is grounded upon the theory of unified representation of gravitational field.The models created in this way are particularly satisfactory for a high_speed computation of gravitational field in low altitude because they take account of topographic effects and have their kernel functions with simple structure and weak singularity.
基金supported by the National Natural Science Foundation of China(grant nos.22475171,22471219,22175142,22071197,22022107,22072103,51821002,and 22161132026)the Key Research and Development Program of Shaanxi(grant no.2024GX-YBXM-380)+1 种基金the Shaanxi Fundamental Science Research Project for Chemistry and Biology(grant nos.22JHQ019 and 23JHZ002)the Fundamental Research Funds for the Central Universities(grant nos.G2023KY0603 and D5000230114).
文摘Achieving molecular self-assembly to produce functional supramolecular polymers with defined dimensions and structural periodicity is crucial,particularly for two-dimensional supramolecular polymers(2DSPs).However,a major challenge to their application has been poor electrical conductivity due to weakπ-electron delocalization in existing synthetic methods.Here,we overcome this limitation by demonstrating the controlled construction of conductive 2DSPs through self-aligned brick-like stacking of doubly chargedπ-conjugated monomers driven by aromatic cation-πinteractions.A key feature of this approach is the upright molecular orientation,a notable departure from the horizontal orientation typical of conventional 2D polymers.This versatile method is compatible with various molecular building blocks,enabling modulation of 2DSP conformation from flat to wavy.We have also prepared free-standing single-layer nanosheets of 2DSPs via solution-assisted exfoliation from their crystals.The resulting 2DSPs demonstrate efficient in-planeπ-electron delocalization,leading to impressive electrical conductivity properties,holding significant promise for optoelectronic applications.
