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scattering function and Spinodal Transition of Linear and Nonlinear Block Copolymers Based on a Unified Molecular Model

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Chinese Journal of Polymer Science 2021年第6期39卷 779-788,I0009页

作者： Weichao Shi Key Laboratory of functional Polymer Materials of Ministry of Education Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China

This work uses a block copolymer architecture[(A′B)nA2]m to unify the scattering function and spinodal transition of typical AB-type block *** key roles of block number,junction points and asymmetry ratios of block length are(1)to determine the form factor of each block copolymer at the molecular scale;(2)to affect the entropy loss across the spinodal transition and may result in deflection of spinodal *** common features are validated in typical linear and nonlinear block copolymers,including AB diblock,asymmetric A′BA triblock,miktoarm stars of ABn,AnBn,(AB)n,(A′B)nA,A′BAm,and multi-graft combs of(BnA2)m and[(A′B)nA2]*** explicit scattering functions and form factors of various block copolymers can be directly applied in radiation experiments(*** or X-ray scattering)to unravel the effect of molecular architecture in solution and microphase separation in disordered *** molecular model used in this study is also helpful to guide the chemical synthesis to explore more potentially interesting block copolymers.

关键词： scattering function Form factor Spinodal transition Molecular structure Block copolymer

Research on the acoustic scattering function and coherence properties from rough seafloor based on finite element model

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Chinese Physics B 2016年第12期25卷 85-91页

作者：雷波杨益新马远良陈东旭 School of Marine Science and Technology Northwestern Polytechnical University

Acoustic scattering from a rough sea bottom is recognized as a main source of reverberation. In this study, scattering properties from a layered bottom were exploited based on the finite element model. The scattering strength and loss from the layered rough seabed were investigated by ensembling the realizations of rough interface. They were found to be dependent on the thickness of sediment, and interference was significant in the case of thin sediment. Through verification of the finite element model, the scattering loss could be evaluated using the Eckart model with a proper sound speed in the thick sediment. The multiple scattering effect on the sound field was also exploited. It revealed that the effect depended strongly on the bottom type.

关键词： finite element rough seafloor scattering function coherence

A Study on Ionospheric HF Channel with Bitemporal Response and scattering function

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Wuhan University Journal of Natural Sciences 2000年第3期5卷 317-319页

作者： Chong Yan-wen Xie Shu-guo Zhao Zheng-yu Huang Tian-xi Yao Yong-gang Wuhan University College of Electronic Information Wuhan China (GRID:grid.49470.3e) (ISNI:***)

At first the bitemporal response method is introduced to solve the scattering function of the ionospeeric channel. We can get the scattering function, as a function, of the group path time delay and Doppler frequency. Thus Doppler effect resulting from the continuous movement of the ionosphere is analyzed to study the characteristics of the various ionospheric irregularities and diturbance. many possible problems and correction are researched lastly.

关键词： bitemporal response function scattering function the Doppler effect the movement of the ionosphere

Automated Identification of Ordered Phases for Simulation Studies of Block Copolymers

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Chinese Journal of Polymer Science 2024年第5期42卷 683-692,I0011页

作者： Yu-Chen Zhang Wei-Ling Huang Yi-Xin Liu State Key Laboratory of Molecule Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai200433China

In unit cell simulations,identification of ordered phases in block copolymers(BCPs)is a tedious and time-consuming task,impeding the advancement of more streamlined and potentially automated research *** this study,we propose a scattering-based automated identification strategy(SAIS)for characterization and identification of ordered phases of BCPs based on their computed scattering *** approach leverages the scattering theory of perfect crystals to efficiently compute the scattering patterns of periodic morphologies in a unit *** the first stage of the SAIS,phases are identified by comparing reflection conditions at a sequence of Miller *** confirm or refine the identification results of the first stage,the second stage of the SAIS introduces a tailored residual between the test phase and each of the known candidate ***,our strategy incorporates a variance-like criterion to distinguish background species,enabling its extension to multi-species BCP *** has been demonstrated that our strategy achieves exceptional accuracy and robustness while requiring minimal computational ***,the approach allows for real-time expansion and improvement to the candidate phase library,facilitating the development of automated research workflows for designing specific ordered structures and discovering new ordered phases in BCPs.

关键词： Block copolymer Phase identification scattering function

FRACTIONAL ANOMALOUS DIFFUSION CAUSED BY AN INSTANTANEOUS POINT SOURCE IN DISORDERED FRACTAL MEDIA

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FRACTIONAL ANOMALOUS DIFFUSION CAUSED BY AN INSTANTANEOUS PO...