The remarkable properties of carbon nanotubes(CNTs)have led to promising applications in the field of electromagnetic inter-ference(EMI)shielding.However,for macroscopic CNT assemblies,such as CNT film,achieving high ...The remarkable properties of carbon nanotubes(CNTs)have led to promising applications in the field of electromagnetic inter-ference(EMI)shielding.However,for macroscopic CNT assemblies,such as CNT film,achieving high electrical and mechanical properties remains challenging,which heavily depends on the tube-tube interac-tions of CNTs.Herein,we develop a novel strategy based on metal-organic decomposition(MOD)to fabricate a flexible silver-carbon nanotube(Ag-CNT)film.The Ag particles are introduced in situ into the CNT film through annealing of MOD,leading to enhanced tube-tube interactions.As a result,the electrical conductivity of Ag-CNT film is up to 6.82×10^(5) S m^(-1),and the EMI shielding effectiveness of Ag-CNT film with a thickness of~7.8μm exceeds 66 dB in the ultra-broad frequency range(3-40 GHz).The tensile strength and Young’s modulus of Ag-CNT film increase from 30.09±3.14 to 76.06±6.20 MPa(~253%)and from 1.12±0.33 to 8.90±0.97 GPa(~795%),respectively.Moreover,the Ag-CNT film exhibits excellent near-field shield-ing performance,which can effectively block wireless transmission.This innovative approach provides an effective route to further apply macroscopic CNT assemblies to future portable and wearable electronic devices.展开更多
Background：Several studies have investigated the association between smoking and anal abscess and anal fistula （AA/F） diseases.However,the relationship between cigarette smoking and AA/F remains unclear.This study ...Background：Several studies have investigated the association between smoking and anal abscess and anal fistula （AA/F） diseases.However,the relationship between cigarette smoking and AA/F remains unclear.This study sought to assess the role of smoking in anorectal male patients in a Chinese population.Methods：In this retrospective study,a questionnaire,including smoking history,was completed over a 3-month period by male inpatients in the Proctology Department of China-Japan Friendship Hospital.＂Cases＂ were patients who had AA/F,and ＂controls＂ were patients with other anorectal complaints.Mann-Whitney U-test and Chi-square test were carried out to examine differences in baseline characteristics between groups.Subsequently,multivariate logistic regression was used to explore any related factors.Results：A total of 977 patients aged from 18 to 80 years were included,excluding those diagnosed with inflammatory bowel disease or diabetes mellitus.Out of this total,805 patients （82.4％） completed the entire questionnaire.Among the 805 patients,334 （41.5％） were cases and 471 （58.5％） were controls.Results showed significant differences between cases and controls （x2 =205.2,P ＜ 0.001）,with smoking found to be associated with the development of AA/F diseases （odds ratio：12.331,95％ confidence interval：8.364-18.179,P ＜ 0.001）.Conclusions：This study suggested smoking to be a potential risk factor for the development of AA/F diseases in a Chinese population.Consequently,current smoking patients should be informed of this relationship,and further research should be conducted to explore and investigate this further.展开更多
In this paper, we propose a new time-dependent model for solving total variation （TV） minimization problems in image restoration. The main idea is applying a priori smoothness on the solution image. Five different B...In this paper, we propose a new time-dependent model for solving total variation （TV） minimization problems in image restoration. The main idea is applying a priori smoothness on the solution image. Five different BCs are introduced and analyzed. 2D numerical experimental results by explicit numerical schemes are discussed.展开更多
In this paper, we analyze the Bregman iterative model using the G-norm. Firstly, we show the convergence of the iterative model. Secondly, using the source condition and the symmetric Bregman distance, we consider the...In this paper, we analyze the Bregman iterative model using the G-norm. Firstly, we show the convergence of the iterative model. Secondly, using the source condition and the symmetric Bregman distance, we consider the error estimations between the iterates and the exact image both in the case of clean and noisy data. The results show that the Bregman iterative model using the G-norm has the similar good properties as the Bregman iterative model using the L2-norm.展开更多
基金The authors gratefully acknowledge financial support from the National Natural Science Foundation of China(52103090)the Natural Science Foundation of Guangdong Province(2022A1515011780)Autonomous deployment project of China National Key Laboratory of Materials for Integrated Circuits(NKLJC-Z2023-B03).
文摘The remarkable properties of carbon nanotubes(CNTs)have led to promising applications in the field of electromagnetic inter-ference(EMI)shielding.However,for macroscopic CNT assemblies,such as CNT film,achieving high electrical and mechanical properties remains challenging,which heavily depends on the tube-tube interac-tions of CNTs.Herein,we develop a novel strategy based on metal-organic decomposition(MOD)to fabricate a flexible silver-carbon nanotube(Ag-CNT)film.The Ag particles are introduced in situ into the CNT film through annealing of MOD,leading to enhanced tube-tube interactions.As a result,the electrical conductivity of Ag-CNT film is up to 6.82×10^(5) S m^(-1),and the EMI shielding effectiveness of Ag-CNT film with a thickness of~7.8μm exceeds 66 dB in the ultra-broad frequency range(3-40 GHz).The tensile strength and Young’s modulus of Ag-CNT film increase from 30.09±3.14 to 76.06±6.20 MPa(~253%)and from 1.12±0.33 to 8.90±0.97 GPa(~795%),respectively.Moreover,the Ag-CNT film exhibits excellent near-field shield-ing performance,which can effectively block wireless transmission.This innovative approach provides an effective route to further apply macroscopic CNT assemblies to future portable and wearable electronic devices.
文摘Background：Several studies have investigated the association between smoking and anal abscess and anal fistula （AA/F） diseases.However,the relationship between cigarette smoking and AA/F remains unclear.This study sought to assess the role of smoking in anorectal male patients in a Chinese population.Methods：In this retrospective study,a questionnaire,including smoking history,was completed over a 3-month period by male inpatients in the Proctology Department of China-Japan Friendship Hospital.＂Cases＂ were patients who had AA/F,and ＂controls＂ were patients with other anorectal complaints.Mann-Whitney U-test and Chi-square test were carried out to examine differences in baseline characteristics between groups.Subsequently,multivariate logistic regression was used to explore any related factors.Results：A total of 977 patients aged from 18 to 80 years were included,excluding those diagnosed with inflammatory bowel disease or diabetes mellitus.Out of this total,805 patients （82.4％） completed the entire questionnaire.Among the 805 patients,334 （41.5％） were cases and 471 （58.5％） were controls.Results showed significant differences between cases and controls （x2 =205.2,P ＜ 0.001）,with smoking found to be associated with the development of AA/F diseases （odds ratio：12.331,95％ confidence interval：8.364-18.179,P ＜ 0.001）.Conclusions：This study suggested smoking to be a potential risk factor for the development of AA/F diseases in a Chinese population.Consequently,current smoking patients should be informed of this relationship,and further research should be conducted to explore and investigate this further.
基金Supported by the National Natural Science Foundation of China (No. 10726035, 10801049)Foundation of North China Electric Power University
文摘In this paper, we propose a new time-dependent model for solving total variation （TV） minimization problems in image restoration. The main idea is applying a priori smoothness on the solution image. Five different BCs are introduced and analyzed. 2D numerical experimental results by explicit numerical schemes are discussed.
基金Supported by the National Natural Science Foundation of China(No.10726035,10771065,10801049)Foundation of North China Electric Power University
文摘In this paper, we analyze the Bregman iterative model using the G-norm. Firstly, we show the convergence of the iterative model. Secondly, using the source condition and the symmetric Bregman distance, we consider the error estimations between the iterates and the exact image both in the case of clean and noisy data. The results show that the Bregman iterative model using the G-norm has the similar good properties as the Bregman iterative model using the L2-norm.
