Optical trapping capability of tornado circular Pearcey beams

We systemically investigate optical trapping capability of a kind of tornado waves on Rayleigh particles.Such tornado waves are named as tornado circular Pearcey beams(TCPBs)and produced by combining two circular Pearcey beams with different radii.Our theoretical exploration delves into various aspects,including the propagation dynamics,energy flux,orbital angular momentum,trapping force,and torque characteristics of TCPBs.The results reveal that the orbital angular momentum,trapping force,and torque of these beams can be finely tuned through the judicious manipulation of their topological charges(l_(1)and l_(2)).Notably,we observe a precise control mechanism wherein the force diminishes with|l_(1)+l_(2)|and|l_(1)-l_(2)|,while the torque exhibits enhancement by decreasing solely with|l_(1)+l_(2)|or increasing with|l_(1)-l_(2)|.These results not only provide quantitative insights into the optical trapping performance of TCPBs but also serve as a valuable reference for the ongoing development of innovative photonic tools.

Comprehensive Evaluation of Distributed PV Grid-Connected Based on Combined Weighting Weights and TOPSIS-RSR Method

To effectively quantify the impact of distributed photovoltaic(PV)access on the distribution network,this paper proposes a comprehensive evaluation method of distributed PV grid connection combining subjective and objective combination of assignment and technique for order preference by similarity to an ideal solution(TOPSIS)—rank sum ratio(RSR)(TOPSIS-RSR)method.Based on the traditional distribution network evaluation system,a comprehensive evaluation system has been constructed.It fully considers the new development requirements of distributed PV access on the environmental friendliness and absorptive capacity of the distribution grid and comprehensively reflects the impact of distributed PV grid connection.The analytic hierarchy process(AHP)was used to determine the subjective weights of the primary indicators,and the Spearman consistency test was combined to determine the weights of the secondary indicators based on three objective assignment methods.The subjective and objective combination weights of each assessment indicator were calculated through the principle of minimum entropy.Calculate the distance between the indicators to be evaluated and the positive and negative ideal solutions,the relative closeness ranking,and qualitative binning by TOPSIS-RSR method to obtain the comprehensive evaluation results of different scenarios.By setting up different PV grid-connected scenarios and utilizing the IEEE33 node simulation algorithm,the correctness and effectiveness of the proposed subject-object combination assignment and integrated assessment method are verified.

Banana-shaped electron acceptors with an electron-rich core fragment and 3D packing capability

The emergence of Y6-type nonfullerene acceptors has greatly enhanced the power conversion efficiency(PCE)of organic solar cells(OSCs).However,which structural feature is responsible for the excellent photovoltaic performance is still under debate.In this study,two Y6-like acceptors BDOTP-1 and BDOTP-2 were designed.Different from previous Y6-type acceptors featuring an A–D–Aʹ–D–A structure,BDOTP-1,and BDOTP-2 have no electron-deficient Aʹfragment in the core unit.Instead,there is an electron-rich dibenzodioxine fragment in the core.Although this modification leads to a marked change in the molecular dipole moment,electrostatic potential,frontier orbitals,and energy levels,BDOTP acceptors retain similar three-dimensional packing capability as Y6-type acceptors due to the similar banana-shaped molecular configuration.BDOTP acceptors show good performance in OSCs.High PCEs of up to 18.51%(certified 17.9%)are achieved.This study suggests that the banana-shaped configuration instead of the A–D–Aʹ–D–A structure is likely to be the determining factor in realizing high photovoltaic performance.

Dynamic phasor-based hybrid simulation for multi-inverter grid-connected system

To realize the efficient transient simulation of a grid-connected power generation system based on multiple inverters, this paper proposes a hybrid simulation method integrating the models of electromagnetic transient and dynamic phasors. Based on a demonstration of the concepts and properties of dynamic phasors, the models of single-phase and three-phase inverters described by dynamic phasors are established first. Considering the numerical compatibility problem between dynamic phasors and instantaneous values, an interface scheme between dynamic phasors and instantaneous values is designed, and the efficiency and precision differences of various transformation methods are compared in detail.Finally, by utilizing MATLAB/Simulink, a hybrid simulation platform of a multi-inverter grid-connected system is built, and the efficiency and accuracy of the hybrid simulation are validated via comparison with the full electromagnetic transient simulation.

Experimental study of the temporary plugging capability of diverters to block hydraulic fractures in high-temperature geothermal reservoirs

The effective plugging of artificial fractures is key to the success of temporary plugging and diverting fracturing technology,which is one of the most promising ways to improve the heat recovery efficiency of hot dry rock.At present,how temporary plugging agents plug artificial fractures under high temperature remains unclear.In this paper,by establishing an improved experimental system for the evaluation of temporary plugging performance at high temperature,we clarified the effects of high temperature,injection rate,and fracture width on the pressure response and plugging efficiency of the fracture.The results revealed that the temporary plugging process of artificial fractures in hot dry rock can be divided into four main stages:the initial stage of temporary plugging,the bridging stage of the particles,the plugging formation stage,and the high-pressure dense plugging stage.As the temperature increases,the distribution distance of the temporary plugging agent,the number of pressure fluctuations,and the time required for crack plugging increases.Particularly,when the temperature increases by 100℃,the complete plugging time increases by 90.7%.

Sb-Cu alloy cathode with a novel lithiation mechanism of ternary intermetallic formation: Enabling high energy density and superior rate capability of liquid metal battery

Antimony(Sb) is an attractive cathode for liquid metal batteries(LMBs) because of its high theoretical voltage and low cost.The main obstacles associated with the Sb-based cathodes are unsatisfactory energy density and poor rate-capability.Herein,we propose a novel Sb_(64)Cu_(36)cathode that effectively tackles these issues.The Sb_(64)Cu_(36)(melting point:525℃) cathode presents a novel lithiation mechanism involving sequentially the generation of Li_(2)CuSb,the formation of Li_(3)Sb,and the conversion reaction of Li_(2)CuSb to Li_(3)Sb and Cu.The generated intermetallic compounds show a unique microstructure of the upper floated Li_(2)CuSb layer and the below cross-linked structure with interpenetrated Li_(2)CuSb and Li_(3)Sb phases.Compared with Li_(3)Sb,the lower Li migration energy barrier(0.188 eV) of Li_(2)CuSb significantly facilitates the lithium diffusion across the intermediate compounds and accelerates the reaction kinetics.Consequently,the Li‖Sb_(64)Cu_(36)cell delivers a more excellent electrochemical performance(energy density:353 W h kg^(-1)at 0.4 A cm^(-2);rate capability:0.59 V at 2.0 A cm^(-2)),and a much lower energy storage cost of only 38.45 $ kW h^(-1)than other previously reported Sb-based LMBs.This work provides a novel cathode design concept for the development of high-performance LMBs in applications for large-scale energy storage.

针灸推拿学专业研究生创新能力培养问题与对策

针灸推拿学作为中医学的一门传统优势学科,国家和社会对其创新型研究人才的需求日益迫切。文章分析了目前针灸推拿学专业研究生创新能力的培养现状,从师和生共创的两个角度探讨应对策略,旨在深化针灸推拿学专业研究生教育改革,提高本专业研究生培养质量,培养符合时代特征的、素质全面的针灸推拿学创新型研究人才。

高校图书馆科研数据管理服务能力评价指标体系研究

本文通过对相关文献和主流模型的梳理,从形式、内容、效用三个维度构建高校图书馆科研数据管理服务能力评价指标体系,并通过一系列科学验证,最终得到由机构支撑力、管理服务力、社会效应力3个一级指标,经费资源支撑、数据资源管理、用户素养教育、学术影响力等11个二级指标,成本效益分析、数据使用规范、用户素养教育内容、科研成果产出等35个三级指标构成的指标体系。构建高校图书馆科研数据管理服务能力评价指标体系,在为国内实践研究提供评价工具的同时,也可以促进高校图书馆科研数据管理服务规范化发展。

中小企业数字化转型的路径探析

加快推动中小企业数字化转型是数字经济发展的重要基础。由于缺乏足够的技术与资源,中小企业数字化转型需依附第三方数字平台完成产品体系、组织结构、业务流程的改造,进而降低成本、提升效率。其数字化转型过程为企业层面的数字技术部分采用、行业层面的数字技术整体融合以及生态层面的数字技术共生发展。但中小企业在数字化转型过程中,还面临数字意识薄弱、转型能力不足、转型资源受限、转型数据欠缺、转型成本过高等诸多困境。中小企业要立足推动数字经济发展的战略要求,从培养动态管理能力、运用轻体量数字平台、提升组织使用信息技术的能力、获得政府外部帮扶及支持等方面创新路径,推动数字化转型。

基于情感和认知协同的道德判断方法

随着大语言模型的迅速发展,大语言模型的安全性逐渐引起了研究者和公众的密切关注.为了防止大语言模型在与人类协作中对人类产生伤害,如何确保大语言模型在日常场景中的判断能与人类道德观念相符成为了一个重要问题.其中一个关键的挑战是,如何确保大语言模型在道德判断方面,能够像人类那样,针对不同的情境,灵活地调整或重新考虑预定的规则,从而使其判断与人类的道德观念保持一致.受心理学和认知科学中关于人类道德判断的情感和认知影响因素研究的启发,结合大语言模型在认知推理和情感分析能力上的优势,设计了一种模仿人类道德判断过程中情感判断和认知判断能力交互的方法,从而提升了大语言模型的道德判断表现.实验结果证明了所提方法在该任务上的有效性.总的来说,不仅为大语言模型的道德判断提供了一种创新的方法,也强调了心理学与认知科学理论在此领域的重要性,为未来的进一步研究奠定基础.

考虑碳流约束的电力系统能碳安全域模型与计算方法

针对当前电力系统碳减排任务与安全稳定运行需求,研究电力系统低碳安全运行技术。现有的能量流安全域模型使电力系统安全监视与控制更加科学有效,但忽略了系统运行过程中可能存在的“高碳”风险。文中提出了一种考虑碳流约束的电力系统能碳耦合安全域(简称能碳安全域)模型与计算方法,旨在保证系统安全性的同时减排提效。为完整刻画电力系统的低碳运行能力极限,分别从负荷端和源端角度提出了考虑碳流约束的系统最大供电能力曲线及最大消纳能力曲线模型。基于系统最大供电能力工作点,提出了能碳安全边界仿真拟合计算方法,实现了能碳安全域的降维观测。最后,结合算例验证了所提模型的有效性。

“三融入,一反哺”:植物生理学课程思政探索与实践

课程思政是立德树人的根本任务,针对植物生理学教学中课程思政元素融入不够,育智重于育人的不足。以文化自信为切入点,采取“三融入,一反哺”策略,即将处于世界领先地位的中国古代传统农业思想、近现代中国植物生理学家的成就、西南联合大学(简称“西南联大”)的卓越贡献和科研反哺教学融入植物生理学教学。激发学生的学习热情,提高创新能力;增强文化自信,提升专业认同感。

新时代韧性社区建设路径研究

面对不确定性风险的扰动与冲击,传统的理论框架难以回应社会现实样态中确定性与不确定性的耦合效应,韧性理念逐渐成为社区治理研究的理论共识。随着中国式现代化道路的不断推进,要求反思和探索基层社区治理在应对风险社会、供给公共服务、培育社会资本、提升治理效能等维度的价值取向和实践机制。研究发现,现阶段推进韧性社区建设,还面临着组织能力滞后、资源整合松散、情感维系游离等现实梗阻。因此,提升社区治理能力以及推进韧性社区的持续性发展,需要把握韧性社区的功用和治理逻辑,在结构要素、功能效应、社会价值等维度建构富有韧性的治理体系,以回应不确定性情境下社区治理现代化的现实要求。

数字平台生态嵌入对商业模式创新的影响研究——基于资源编排理论的视角

数字平台生态系统是缓解企业资源与能力约束进而推动企业实现商业模式创新的重要载体,但数字平台生态嵌入如何影响商业模式创新尚未被充分揭示。基于资源编排理论,构建并检验了数字平台生态嵌入通过能力进化式重构与能力替代式重构作用于商业模式创新的双中介模型,并探讨了组织敏捷性的调节作用。研究发现:数字平台生态嵌入正向影响商业模式创新;能力进化式重构与能力替代式重构在数字平台生态嵌入与商业模式创新的关系中起双中介作用;组织敏捷性不仅会强化数字平台生态嵌入与能力进化式重构和能力替代式重构之间的正向关系,还会正向强化数字平台生态嵌入通过能力进化式重构与替代式重构影响商业模式创新的中介路径。研究结论丰富了商业模式创新的前因研究,并为企业嵌入数字平台生态系统进行商业模式创新提供了实践启示。

老年髋部骨折患者照护人员照护能力提升需求调查研究

目的探讨老年髋部骨折患者照护人员照护能力提升需求及主要影响因素。方法采取便利抽样法选取医院、养老机构、康复机构、居家照护4类机构417名老年髋部骨折患者照护人员,自行设计老年髋部骨折患者照护人员照护能力提升需求问卷进行调查。结果老年髋部骨折患者照护人员照护能力提升需求总分为(303.61±41.15)分,疾病相关知识需求、基础照护需求、围手术期照护需求、延续性家庭康复照护需求维度得分分别为(55.91±8.79)分、(80.40±11.71)分、(109.55±15.42)分、(57.76±8.63)分。多元线性回归分析显示,照护培训经历、个人照护能力水平自我评价是老年髋部骨折患者照护人员照护能力提升需求的主要影响因素。结论老年髋部骨折患者照护人员的照护能力提升需求较强烈,应以需求为导向,针对性设计培训项目内容,以满足照护人员的能力提升需求。

企业数字化能力影响因素分析——以广东省制造业为例

制造业是我国国民经济的重要组成部分,随着新一代信息技术和数字技术的迅猛发展,民众日益增长的智能化需求和数字化市场趋势推动着企业不断探索和构建自身的数字化能力来实现数字化转型,进而获取持续的竞争优势。本文基于动态能力理论和TOE分析框架,以广东省制造业为例,设计了企业数字化能力的研究模型,并提出假设,在对模型和假设的不同影响路径进行实证检验和修正后,分析了组织结构、高层管理者和数字技术能力对广东省制造企业数字化能力构建的作用机理。

计及灾后恢复全过程储能应急响应能力的配电网韧性规划

储能因响应快、灵活性高的特点,已成为可再生能源发展必不可少的支撑技术,不仅具有削峰填谷、改善电能质量的作用,在灾后恢复过程中的应急响应能力同样不可忽视。提出了一种计及灾后恢复全过程储能应急响应能力的配电网韧性规划方法,构建了同时考虑网架增强和储能配置策略的配电网韧性增强双层规划模型,系统地刻画了极端灾害发生后配电网网架重构、设备抢修及复电等灾后恢复全过程的源-网-荷-储互动模式场景。最后,通过IEEE33节点系统的算例分析表明,所提方法能更充分地挖掘储能的应急响应潜力,有效提高增强性规划决策的精准度,获得更佳的投资回报。

技术密集型企业的创新能力及其对实体经济的影响分析

为研究技术密集型企业的创新能力并探究其对国家实体经济的影响情况,参照A股市场通用的交易性成分指数拟合方式,从上市企业中遴选出300家技术密集型上市企业样本并编制能表征技术密集型企业这个群体的市场表现指标—技术密集型企业300,进而以此为基础从市场表现、产业结构和区域分布情况等方面探究技术密集型企业的创新能力,同时借助自向量回归模型(VAR)的构建和脉冲响应函数的分析探究技术密集型企业对国家实体经济的影响情况。技术密集型企业的整体表现优于蓝筹企业,传统制造企业是其科技创新的主力军,重点分布于首都北京及东南沿海地区,其市场表现对实体经济的重要组成部分工业和消费呈现出正向影响,且对科技含量较高的工业影响最大。

配电网的最小供电能力:定义、模型、求解和应用

最小供电能力是最大供电能力的对偶指标,它们分别位于供电能力曲线的最低点和最高点。提出最小供电能力的定义、数学模型、求解方法和应用方法。建立最小供电能力的数学模型,它是严格安全边界上以总负荷最小为目标函数的线性规划模型;提出基于最大冗余方程的求解方法,以得到达到最小供电能力时的工作点,针对每个取得最小供电能力的边界,该方法将冗余量等于最大冗余的约束添加到边界约束中,形成最大冗余方程,通过求解该方程得到边界上最小供电能力点的表达式;对所有的最小供电能力点表达式取并集得到最终结果。算例结果验证了所提模型和方法的正确性。

急诊科护士突发公共卫生事件心理弹性培训方案的构建与初步应用研究

目的构建基于Kumpfer心理弹性框架理论与国际心理弹性研究计划项目组(the International Resilience Research Project,IRRP)心理弹性训练策略的心理弹性培训方案,探讨其在急诊科护士突发公共卫生事件下的应用效果。方法2022年1-6月,采用简单随机抽样法选择上海市某三级医院的急诊科护士为研究对象,按随机数字表分为对照组和观察组各30例,对照组采用常规培训和管理方法,观察组在对照组的基础上实施心理弹性培训方案。评价并比较两组护士干预前后心理弹性及应急能力的变化。结果干预后,观察组护士的心理弹性、应急能力得分均高于对照组(均P<0.05)。结论心理弹性培训方案在突发公共卫生事件下能有效提升急诊科护士的心理弹性水平,保障突发公共卫生事件应急处置工作有序开展。