MaOEA/I:Many-objective Evolutionary Algorithm Based on Indicator I_(ε+)

Balancing the diversity and convergence of the population is challenging in multi-objective optimization. The work proposed a many-objective evolutionary algorithm based on indicator I_(ε+)(MaOEA/I) to solve the above problems. Indicator I_(ε+)(x,y) is used for environmental selection to ensure diversity and convergence of the population. I_(ε+)(x,y) can evaluate the quality of individual x compared with individual y instead of the whole population. If I_(ε+)(x,y) is less than 0, individual x dominates y. If I_(ε+)(x,y) is 0, individuals x and y are the same. If I_(ε+)(x,y) is greater than 0, no dominant relationship exists between individuals x and y. The smaller I_(ε+)(x,y), the closer the two individuals. The dominated individuals should be deleted in environmental selection because they do not contribute to convergence. If there is no dominant individual, the same individuals and similar individuals should be deleted because they do not contribute to diversity. Therefore, the environmental selection of MaOEA/I should consider the two individuals with the smallest I_(ε+)(x,y). If I_(ε+)(x,y) is not greater than 0, delete individual y;if I_(ε+)(x,y) is greater than 0, check the distance between individuals x, y, and the target point and delete the individual with a longer distance. MaOEA/I is compared with 6 algorithms until the population does not exceed the population size. Experimental results demonstrate that MaOEA/I can gain highly competitive performance when solving many-objective optimization problems.

Killing two birds with one stone:Constructing tri-elements doped and hollow-structured carbon sphere by a single template for advanced potassium-ion hybrid capacitors

Integrating the merits of long lifespan and excellent energy as well as power densities,potassium-ion hybrid capacitors(PIHCs)exhibit great prospects for future energy storage devices.To boost comprehensive performance of PIHCs,heteroatom-doping and morphology-tuning as two comprehensive strategies have been devoted to designing uniquely structural carbon-based materials with favorable advantages.An ideal strategy for simultaneous atomic doping and structural regulation is expected to be developed.Herein,we propose a novel"Killing Two Birds with One Stone"strategy to prepare a tri-elements doped hollow carbon sphere(TED-HCS)as PIHCs anodes,that is,a single template of spherical CoP particles is rationally adopted,which not only provides both a P source for heteroatom-doping but also acts as a selfsacrificial template for hollow-structure engineering.The multifunctional TED-HCS presents a high capacity of 473.0 mAh g^(-1) and excellent rate performance of 212.5 mAh g^(-1) at 5.0 A g^(-1).Remarkably,the as-assembled PIHCs show outstanding energy/power density(40.4 Wh kg^(-1)/10500 W kg^(-1))and remain high-capacity retention of 89.15%even cycling 12,000 times.The"Killing Two Birds with One Stone"strategy offers new insight into the search for the preparation of carbon-based materials with multi-elements doping and specific morphology structure.

Fabrication of Ceramic-Polymer Piezo-Composites with Triply Periodic Minimal Interfaces via Digital Light Processing

The geometry of the phase interface in co-continuous piezoelectric composites is critical in improving their piezo-electric properties.However,conventional co-continuous piezoelectric composites are mostly simple structures such as wood stacks or honeycombs,which are prone to stress concentrations at the joints,thus reducing the fatigue service performance and force-electric conversion efficiency of piezoelectric composites.Such simple structures limit further improvements in the overall performance of co-continuous piezoelectric composites.In this study,based on the digital light processing 3D printing method,we investigated the influence of three dif-ferent structures-the gyroid,diamond,and woodpile interfaces-on the piezoelectric and mechanical properties of co-continuous ceramic/polymer piezoelectric composites.These findings demonstrate that the gyroid and di-amond interfaces outperformed the ceramic skeleton of the woodpile interface in terms of both mechanical and electrical properties.When the ceramic volume percentage was 50%,the piezo-composite of the gyroid surface exhibited the greatest hydrostatic figure of merit(HFOM),reaching 4.23×10^(−12) Pa^(−1),and its piezoelectric coeffi-cient(d_(33))and relative dielectric constant(εr)reached 115 pC/N and 748,respectively.The research results lay the foundation for the application of co-continuous piezoelectric composites in underwater communication and detection.

重症医学信息物联平台应急建设实践

利用云技术和物联网技术, 构建"以患者为中心"的重症医学信息平台, 对于提高医护人员获取重症患者医学信息的效率以及重症患者的救治率具有重要意义。本研究介绍了浙江大学医学院附属第一医院收治新型冠状病毒肺炎重症患者期间, 在某院区快速搭建并完善重症医学信息物联平台的实践。该平台实现了对多种重症医学装备的有效物联, 具有信息集成全、搭建速度快、系统延展性好等特点, 具备生命体征监测及生命支持、床旁治疗数据检索、远程诊疗和云共享等功能, 能够提高医护人员的工作效率、提升重症治疗的效果, 降低与患者的接触频次, 可为重大公共卫生事件背景下快速建立重症诊治信息平台提供借鉴。

Patient-directed vs.fixed-volume PEG for colonoscopy preparation:a randomized controlled trial

Background:Individualization using different volumes of polyethylene glycol is widely regarded as the optimal solution for bowel preparation,while the patient-directed regimen we propose may serve as a reliable individual solution.This study aimed to assess the efficacy,safety,and satisfaction of bowel preparation with a patient-directed regimen.Methods:Patients in the fixed-volume group ingested the same amount of PEG,while those in patient-directed group ingested different amount according to stool consistency or stool water content.Results:After filtering by exclusion criteria,428 individuals in the fixed-volume group and 103 in the patient-directed group were successfully enrolled and analyzed.Eighty-three(80.6%)individuals in the patient-directed group had a reduced polyethylene glycol volume.There was no significant difference in the bowel preparation efficacy between the two groups(90.0%vs.90.3%,χ^(2)=0.01;p=0.918).Patients in the patient-directed group complained of fewer adverse effects(53.0%vs.36.9%,χ^(2)=8.655;p=0.003),especially vomiting(13.6%vs.1.0%,χ^(2)=13.304;p<0.001).Regarding comfort during bowel preparation,the degree of comfort was not significantly different between groups.Furthermore,the willingness rate for further colonoscopy in the patient-directed group was significantly higher than that in the fixed-volume group(90.3%vs.77.1%,χ^(2)=8.912;p<0.05).Multivariable logistic regression analysis showed that the body mass index served as an independent factor impacting quality of bowel preparation with the patient-directed regimen(OR 1.16,95%CI 1.00–1.34;p=0.043).Conclusions:Without decreasing the bowel preparation efficacy,the patient-directed regimen increased the safety and satisfaction of bowel preparation and is expected to be a regular and individual solution for bowel preparation.Individuals with a lower body mass index are more likely to undertake this new regimen.