In this paper, the behavior of barrel-vaulted structures undergoing rocking of the abutments and the effectiveness of a few retrofit solutions are discussed. The comprehension of the structural performance of vault-ab...In this paper, the behavior of barrel-vaulted structures undergoing rocking of the abutments and the effectiveness of a few retrofit solutions are discussed. The comprehension of the structural performance of vault-abutment systems is fundamental for their seismic vulnerability assessment, and for the design of efficient strengthening techniques. In the paper, traditional techniques such as extrados thin concrete slab or masonry spandrel walls as well as an innovative solution with an extrados thin improved lime mortar slab reinforced by means of glass fiber mesh are considered. The different strengthening solutions are studied and compared on the basis of the results of non linear numerical analyses and by reference to a simplified analytical approach. Numerical and analytical models are validated through comparison with the results of a recent experimental study focusing on the behavior of vaulted masonry structures subjected to rocking of the abutments. The validated models can be used by engineers for the seismic vulnerability assessment of masonry vaulted structures as well as for the proportioning of possible extrados strengthening solutions, and will be used in the future to explore different structural system configurations.展开更多
RENEWING THE FORBIDDEN CITY’S CENTURY-OLD LEGACY.Oriental Outlook.27 November 2025.At sunrise,the Forbidden City glows under a veil of gold;at night,it retreats into quiet dignity.But the palace never really sleeps.A...RENEWING THE FORBIDDEN CITY’S CENTURY-OLD LEGACY.Oriental Outlook.27 November 2025.At sunrise,the Forbidden City glows under a veil of gold;at night,it retreats into quiet dignity.But the palace never really sleeps.As visitors depart,the“digital relic vault”awakens online,where porcelain,calligraphy,jade and timepieces reveal their beauty in virtual form.History continues to breathe in the data stream.展开更多
AIM:To evaluate the differences and consistency of vault measurements obtained by Scheimpflug tomography(Pentacam),anterior segment optical coherence tomography(AS-OCT,CASIA II),and ultrasound biomicroscopy(UBM)follow...AIM:To evaluate the differences and consistency of vault measurements obtained by Scheimpflug tomography(Pentacam),anterior segment optical coherence tomography(AS-OCT,CASIA II),and ultrasound biomicroscopy(UBM)following implantable collamer lens(ICL)V4c implantation.METHODS:Vault measurements were acquired using three modalities:Pentacam,CASIA II AS-OCT,and UBM.Repeated-measures analysis of variance was used to compare the vault values obtained by the three devices.The correlation and consistency of measurements among the three instruments were assessed using the Pearson correlation coefficient,intraclass correlation coefficient(ICC),and Bland-Altman plots.RESULTS:This retrospective study enrolled 210 myopic eyes of 210 patients(158 women and 52 men)who underwent ICL implantation:108 eyes had a myopic ICL V4c implanted,and 102 eyes had a toric ICL V4c implanted.The mean vault values measured by Pentacam,CASIA II,and UBM were 452.64±204.20μm,538.57±203.54μm,and 560.95±227.54μm,respectively,with statistically significant differences among the three groups(P<0.05).Pearson correlation analysis showed strong positive correlations between vault values measured by different instruments(all P<0.001).ICC results indicated good consistency among the three measurement modalities(all P<0.001).Stratified analysis revealed that when the vault value was≤250μm,the correlation and consistency of measurements across the three instruments were lower than those in the medium and high vault subgroups.CONCLUSION:Vault values measured by Pentacam are lower than those obtained by CASIA II and UBM,with UBM yielding the highest mean vault values.Measurements from the three instruments are not interchangeable but can serve as mutual references due to their significant correlation and good overall consistency.Pentacam and CASIA II demonstrate the highest consistency in vault measurement.Notably,when the vault value is≤250μm,the consistency between Pentacam and the other two instruments decreases significantly.展开更多
AIM:To predict the post-operative vault and the suitable size of the implantable collamer lens(ICL)by comparing the performance of multiple artificial intelligence(AI)algorithms.METHODS:A retrospective analysis of 83 ...AIM:To predict the post-operative vault and the suitable size of the implantable collamer lens(ICL)by comparing the performance of multiple artificial intelligence(AI)algorithms.METHODS:A retrospective analysis of 83 patients with 132 eyes was conducted from 2020 to 2023.All patients underwent implantation of EVO-V4C ICLs.ICLs were selected based on STAAR’s recommended formula.Postoperative vault values were measured using anterior segment optical coherence tomography(ASOCT).First,feature selection was performed on patients’preoperative examination parameters to identify those most closely related to postoperative vault and incorporate them into the machine learning model.Subsequently,four regression models,namely MLP,XGBoost,RFR,and KNN,were employed to predict the vault,and their predictive performances were compared.The ICL size was set as the prediction target,with the vault and other input features serving as new inputs for predicting the ICL size.RESULTS:Among all preoperative parameters,16 parameters were most closely related to postoperative vault and were included in the prediction model.In vault prediction,XGBoost performed the best in the regression model(R^(2)=0.9999),followed by MLP(R^(2)=0.9987)and RFR(R^(2)=0.8982),while the KNN model had the lowest predictive performance(R^(2)=0.3852).XGBoost achieved a prediction accuracy of 99.8%,MLP had a prediction accuracy of 98.9%,while RFR and KNN had accuracies of 87.1%and 57.4%,respectively.CONCLUSION:AI effectively predicts postoperative vault and determines ICL size.XGBoost outperforms other machine-learning algorithms tested.Its accurate predictions help ophthalmologists choose the right ICL size,ensuring proper vaulting.展开更多
Phakic intraocular lens implantation has become one of the important means of correcting refractive errors today.Among them,the implantable collamer lens(ICL)is favored for its wide range of correction,excellent optic...Phakic intraocular lens implantation has become one of the important means of correcting refractive errors today.Among them,the implantable collamer lens(ICL)is favored for its wide range of correction,excellent optical quality,and high safety,but the risks of postoperative complications such as glaucoma and anterior subcapsular opacification still exist.Vault is an important indicator for evaluating the safety after ICL implantation,and its ideal state is crucial for preventing complications.Studies have shown that iris morphology has a significant impact on vault.In order to further optimize surgical outcomes and improve surgical safety,this review comprehensively reviews the research progress of iris-related parameters in ICL implantation and discusses the importance of various parameters in preoperative evaluation and postoperative follow-up.展开更多
In accordance with the relative movement between end-milling cutter and workpiece surface, a theoretical generation model for milled surface was established with the movement error of principal axle considered. Then t...In accordance with the relative movement between end-milling cutter and workpiece surface, a theoretical generation model for milled surface was established with the movement error of principal axle considered. Then the milled surfaces under various cutting condition were simulated, the results of which showed that end milled surfaces were of "vaulted profile", heights of surface irregularty at various points to be different with maximum value in the middle and smaller at both sides, the difference were determined by diameter of milling cutter, feeding speed, ratio between the diameter of milling cutter and teeth point curve radius and width of workpiece. The study results can be applied to quality prediction of milled surfaces for precision and/or super precision milling operation.展开更多
文摘In this paper, the behavior of barrel-vaulted structures undergoing rocking of the abutments and the effectiveness of a few retrofit solutions are discussed. The comprehension of the structural performance of vault-abutment systems is fundamental for their seismic vulnerability assessment, and for the design of efficient strengthening techniques. In the paper, traditional techniques such as extrados thin concrete slab or masonry spandrel walls as well as an innovative solution with an extrados thin improved lime mortar slab reinforced by means of glass fiber mesh are considered. The different strengthening solutions are studied and compared on the basis of the results of non linear numerical analyses and by reference to a simplified analytical approach. Numerical and analytical models are validated through comparison with the results of a recent experimental study focusing on the behavior of vaulted masonry structures subjected to rocking of the abutments. The validated models can be used by engineers for the seismic vulnerability assessment of masonry vaulted structures as well as for the proportioning of possible extrados strengthening solutions, and will be used in the future to explore different structural system configurations.
文摘RENEWING THE FORBIDDEN CITY’S CENTURY-OLD LEGACY.Oriental Outlook.27 November 2025.At sunrise,the Forbidden City glows under a veil of gold;at night,it retreats into quiet dignity.But the palace never really sleeps.As visitors depart,the“digital relic vault”awakens online,where porcelain,calligraphy,jade and timepieces reveal their beauty in virtual form.History continues to breathe in the data stream.
基金Supported by the National Natural Science Foundation of China(No.82171095)the Project of Shanghai Science and Technology(No.23XD1400500)the Research Fund of Sichuan Academy of Medical Sciences and Sichuan Provincial People’s Hospital(No.24QNPY049).
文摘AIM:To evaluate the differences and consistency of vault measurements obtained by Scheimpflug tomography(Pentacam),anterior segment optical coherence tomography(AS-OCT,CASIA II),and ultrasound biomicroscopy(UBM)following implantable collamer lens(ICL)V4c implantation.METHODS:Vault measurements were acquired using three modalities:Pentacam,CASIA II AS-OCT,and UBM.Repeated-measures analysis of variance was used to compare the vault values obtained by the three devices.The correlation and consistency of measurements among the three instruments were assessed using the Pearson correlation coefficient,intraclass correlation coefficient(ICC),and Bland-Altman plots.RESULTS:This retrospective study enrolled 210 myopic eyes of 210 patients(158 women and 52 men)who underwent ICL implantation:108 eyes had a myopic ICL V4c implanted,and 102 eyes had a toric ICL V4c implanted.The mean vault values measured by Pentacam,CASIA II,and UBM were 452.64±204.20μm,538.57±203.54μm,and 560.95±227.54μm,respectively,with statistically significant differences among the three groups(P<0.05).Pearson correlation analysis showed strong positive correlations between vault values measured by different instruments(all P<0.001).ICC results indicated good consistency among the three measurement modalities(all P<0.001).Stratified analysis revealed that when the vault value was≤250μm,the correlation and consistency of measurements across the three instruments were lower than those in the medium and high vault subgroups.CONCLUSION:Vault values measured by Pentacam are lower than those obtained by CASIA II and UBM,with UBM yielding the highest mean vault values.Measurements from the three instruments are not interchangeable but can serve as mutual references due to their significant correlation and good overall consistency.Pentacam and CASIA II demonstrate the highest consistency in vault measurement.Notably,when the vault value is≤250μm,the consistency between Pentacam and the other two instruments decreases significantly.
基金Supported by the National Natural Science Foundation of China(No.82271100)the Jiangsu Science and Technology Support Program(No.BE2022805)the Clinical Skills Enhancement Program of Jiangsu Province Hospital(No.JSPH-MC-2022-24).
文摘AIM:To predict the post-operative vault and the suitable size of the implantable collamer lens(ICL)by comparing the performance of multiple artificial intelligence(AI)algorithms.METHODS:A retrospective analysis of 83 patients with 132 eyes was conducted from 2020 to 2023.All patients underwent implantation of EVO-V4C ICLs.ICLs were selected based on STAAR’s recommended formula.Postoperative vault values were measured using anterior segment optical coherence tomography(ASOCT).First,feature selection was performed on patients’preoperative examination parameters to identify those most closely related to postoperative vault and incorporate them into the machine learning model.Subsequently,four regression models,namely MLP,XGBoost,RFR,and KNN,were employed to predict the vault,and their predictive performances were compared.The ICL size was set as the prediction target,with the vault and other input features serving as new inputs for predicting the ICL size.RESULTS:Among all preoperative parameters,16 parameters were most closely related to postoperative vault and were included in the prediction model.In vault prediction,XGBoost performed the best in the regression model(R^(2)=0.9999),followed by MLP(R^(2)=0.9987)and RFR(R^(2)=0.8982),while the KNN model had the lowest predictive performance(R^(2)=0.3852).XGBoost achieved a prediction accuracy of 99.8%,MLP had a prediction accuracy of 98.9%,while RFR and KNN had accuracies of 87.1%and 57.4%,respectively.CONCLUSION:AI effectively predicts postoperative vault and determines ICL size.XGBoost outperforms other machine-learning algorithms tested.Its accurate predictions help ophthalmologists choose the right ICL size,ensuring proper vaulting.
基金Key Research and Development Projects of Zhejiang Science and Technology Plan(No.2021C03103)Research and Development Plan of Zhejiang Science and Technology Department(No.2023C03089)Scientific Research Project of Zhejiang Provincial Department of Education(No.Y202456401)。
文摘Phakic intraocular lens implantation has become one of the important means of correcting refractive errors today.Among them,the implantable collamer lens(ICL)is favored for its wide range of correction,excellent optical quality,and high safety,but the risks of postoperative complications such as glaucoma and anterior subcapsular opacification still exist.Vault is an important indicator for evaluating the safety after ICL implantation,and its ideal state is crucial for preventing complications.Studies have shown that iris morphology has a significant impact on vault.In order to further optimize surgical outcomes and improve surgical safety,this review comprehensively reviews the research progress of iris-related parameters in ICL implantation and discusses the importance of various parameters in preoperative evaluation and postoperative follow-up.
文摘In accordance with the relative movement between end-milling cutter and workpiece surface, a theoretical generation model for milled surface was established with the movement error of principal axle considered. Then the milled surfaces under various cutting condition were simulated, the results of which showed that end milled surfaces were of "vaulted profile", heights of surface irregularty at various points to be different with maximum value in the middle and smaller at both sides, the difference were determined by diameter of milling cutter, feeding speed, ratio between the diameter of milling cutter and teeth point curve radius and width of workpiece. The study results can be applied to quality prediction of milled surfaces for precision and/or super precision milling operation.
