An Improved JSO and Its Application in Spreader Optimization of Large Span Corridor Bridge

In this paper,given the shortcomings of jellyfish search algorithmwith low search ability in the early stage and easy to fall into local optimal solution,this paper introduces adaptive weight function and elite strategy,improving the global search scope in the early stage and the ability to refine the local development in the later stage.In the numerical study,the benchmark problem of dimensional optimization with a 10-bar truss structure and simultaneous dimensional shape optimization with a 15-bar truss structure is adopted,and the corresponding penalty method is used for constraint treatment.The test results show that the improved jellyfish search algorithm can provide better truss sections as well as weights.Because when the steel main truss of the large-span covered bridge is lifted,the site is limited and the large lifting equipment cannot enter the site,and the original structure does not meet the problem of stress concentration and large deformation of the bolt group,so the spreader is used to lift,and the improved jellyfish search algorithm is introduced into the design optimization of the spreader.The results show that the improved jellyfish algorithm can efficiently and accurately find out the optimal shape and weight of the spreader,and throughMidas Civil simulation,the spreader used canmeet the requirements of weight and safety.

Preparation of bimetal Co-Ni supported on Mg-Al oxide for chemocatalytic upgrading of tailored fermentation products to energy intensive fuels

The great challenge in the aldol condensation of tailored fermentation products(acetone-butanol-ethanol,ABE)into energy intensive fuels is to develop a suitable catalyst with high activity and low-cost.In this study,Co,Ni,and Co-Ni supported on Mg-Al oxide catalysts were prepared and their pore diameters were enlarged via adding active carbon as a hard template into Mg-Al hydrotalcite.During the aldol condensation reaction,the catalyst activity was enhanced after enlarging the pore diameter and Co-Ni bimetal supported catalyst presented the highest activity,which was resulted from that the electron transfer between Co and Ni in Co-Ni alloy enhanced the dehydrogenation activity and large pore lowered the mass transfer resistance.After optimizing the reaction conditions,acetone conversion and the total selectivity of C_(5)-C_(11)desired products in the aldol condensation of ABE reached up to 76%and 90%,respectively.The stability study showed that the activity was decreased with the increase of reaction number because of the oxidation of metallic Co and Ni,but this could be solved via a simple hydrogen reduction method.

Optimal extent of fluorination enabling strong temperature-dependent aggregation, favorable blend morphology and high-efficiency polymer solar cells

Temperature-dependent aggregation is a key property for some donor polymers to realize favorable bulk-heterojunction(BHJ)morphologies and high-efficiency(>10%) polymer solar cells.Previous studies find that an important structural feature that enables such temperature-dependent aggregation property is the 2nd position branched alkyl chains sitting between two thiophene units.In this report,we demonstrate that an optimal extent of fluorination on the polymer backbone is a second essential structural feature that enables the strong temperature-dependent aggregation property.We compare the properties of three structurally similar polymers with 0,2 or 4 fluorine substitutions in each repeating unit through an in-depth morphological study.We show that the non-fluorinated polymer does not aggregate in solution(0.02 mg mL^(-1) in chlorobenzene) at room temperature,which results in poor polymer crystallinity and extremely large polymer domains.On the other hand,the polymer with four fluorine atoms in each repeating unit exhibits an excessively strong tendency to aggregate,which makes it difficult to process and causes a large domain.Only the polymer with two fluorine atoms in each repeating unit exhibits a suitable extent of temperature-dependent aggregation property.As a result,its blend film achieves a favorable morphology and high power conversion efficiency.This provides another key design rationale for developing donor polymers with suitable temperature-dependent aggregation properties and thus high performance.

有机电化学晶体管材料、器件及功能

有机电化学晶体管具有实现高灵敏度的传感及突破“冯·诺依曼瓶颈”实现低功耗的神经形态计算的潜力.目前有限的活性层材料及低的器件性能严重制约着其进一步集成与应用,器件性能的进一步提升亟需关键活性层材料的原始创新.本文综述了本课题组近五年在有机电化学晶体管材料和器件方面的研究进展.我们从材料源头创新出发,致力于材料制备方法、材料结构、聚集态结构、离子电子耦合传输对材料光电性质的影响以及相关的基本规律和物理过程,打破传统设计思路,发展非金属聚合/偶联方法,使用有效的多功能分子设计与结构调控策略制备新概念共轭高分子/寡聚物/小分子混合离子电子导体的有机电化学晶体管活性层材料;开发有机电化学晶体管的关键技术,实现若干集高性能、高稳定性、柔性于一体的有机电化学晶体管,构筑面向柔性、可穿戴器件的传感及低功耗的有机突触晶体管,对柔性生物电子学的发展具有积极的促进意义.