摘要：Electrochemical lithium extraction from salt lakes is an effective strategy for obtaining lithium at a low ***,the elevated Mg:Li ratio and the presence of numerous coexisting ions in salt lake brines give rise to challenges,such as prolonged lithium extraction periods,diminished lithium extraction efficiency,and considerable environmental *** this work,Li FePO4(LFP)served as the electrode material for electrochemical lithium *** conductive network in the LFP electrode was optimized by adjusting the type of conductive *** approach resulted in high lithium extraction efficiency and extended cycle *** the single conductive agent of acetylene black(AB)or multiwalled carbon nanotubes(MWCNTs)was replaced with the mixed conductive agent of AB/MWCNTs,the average diffusion coefficient of Li+in the electrode increased from 2.35×10^(-9)or 1.77×10^(-9)to 4.21×10^(-9)cm^(2)·s^(-1).At the current density of 20 mA·g^(-1),the average lithium extraction capacity per gram of LFP electrode increased from 30.36 mg with the single conductive agent(AB)to 35.62 mg with the mixed conductive agent(AB/MWCNTs).When the mixed conductive agent was used,the capacity retention of the electrode after 30 cycles reached 82.9%,which was considerably higher than the capacity retention of 65.8%obtained when the single AB was ***,the electrode with mixed conductive agent of AB/MWCNTs provided good cycling *** the conductive agent content decreased or the loading capacity increased,the electrode containing the mixed conductive agent continued to show excellent electrochemical ***,a self-designed,highly efficient,continuous lithium extraction device was *** electrode utilizing the AB/MWCNT mixed conductive agent maintained excellent adsorption capacity and cycling performance in this *** work provides a new perspective for the electrochemical extraction of lithium using LFP electrodes.

摘要：Objective: This study aims to determine the mediating effects of psychological empowerment on abusive supervision and turnover intention as perceived by nurses to provide information to change the status of nurse ***: A cross-sectional survey (a questionnaire examining perceptions of abusive supervision,measurement of psychological empowerment,and questionnaire for turnover intention) was used to collect data.A total of 1127 clinical nurses,who were recruited through convenience sampling,participated in the ***: Nurses' average perceived abusive supervision,psychological empowerment,and turnover intention scores were 1.62 ± 0.95,3.24 ± 0.83,and 14.17 ± 3.78,*** empowerment was found to mediate the relationship between abusive supervision and turnover intention (P< 0.01).Turnover intention tends to be stronger and psychological empowerment reduced when nurse managers adopt an abusive leadership ***: Nurses' psychological empowerment is an intermediary variable that predicts the relationship between abusive supervision and turnover *** managers should manage abusive supervision to increase nurses' psychological empowerment and decrease turnover intention.

摘要：Three kinds of 4-hydroxyl azobenzene compouds with different substituents varied as -NO2, -H, -OCH3 in the para-position were synthesized and characterized. Their nonlinearoptical properties in tetrahydrofuran (THF) and chloroform (CHCl3) solution were determined using Z-scan technique. The results revealed that the nonlinear absorption (β) and nonlinear refraction (γ) values of three azobenzene compounds in THF solution were larger than those in CHCl3 solution. It was mainly due to the regular arrangement and effective π-conjugation of azobenzene molecules caused by the formation of hydrogen bonds between the hydroxyl groups of azobenzene molecules and the oxygen atom of the THF molecules. Among three kinds of azobenzene compounds, the 4-nitro-4′-hydroxyazobenzene (NAzoOH) had the largest coefficients of β and γ values in both THF and CHCl3 solution. It was mainly because that a push-pull (D-π-A) electron system was formed by the electron withdrawing nitro-substituent with electron donating hydroxyl-group in both extremities of azobenzene, resulting in a higher electron delocalization.

摘要：针对钢筋混凝土(RC)柱抗剪承载力传统预测模型的非线性逼近能力不足且无法合理描述不确定性所存在的缺陷,提出一种基于各向异性混合核函数高斯过程回归的RC柱概率抗剪承载力预测模型。首先,基于核函数相加性和自动相关性,构造出一种新型的各向异性混合核函数;然后,结合高斯过程回归原理和各向异性混合核函数,建立了RC柱的概率抗剪承载力模型;进而采用极大似然估计法,确定了RC柱概率抗剪承载力模型的超参数;最后,基于91组剪切破坏RC柱的试验数据,通过与传统核函数形式和传统模型进行对比分析,验证了该模型的有效性。结果表明:与传统核函数相比,各向异性混合核函数的确定性预测指标均方根误差R_(MSE)和平均绝对误差M_(AE)分别降低约16%和19%,概率性预测值指标负对数预测密度N_(LPD)和平均标准化对数损失M_(SLL)分别降低约15%和23%;与传统机器学习模型相比,本文模型的均方根误差R_(MSE)和平均绝对误差M_(AE)分别降低约38%和39%;根据所提出的概率模型能够建立概率密度函数曲线和置信区间,从而合理描述抗剪承载力的不确定性并校准分析传统模型的预测精度。

摘要：可编程交换机的网络流量测量技术凭借其特性可以处理高速网络流量,在灵活性、实时性等方面均有巨大的优势.然而,由于需要使用复杂的P4语言配置交换机的内部逻辑,测量任务部署复杂且易错.此外,测量准确度往往受限于交换机内部可用的测量资源.详细研究基于意图的网络及网络流量测量技术,提出一种意图驱动的网络流量分布式测量方法.首先,设计基于测量意图原语的意图表示形式,构建意图编译器将抽象意图表示转译为可执行的P4代码.其次,提出网络流量分布式测量方法,使用多台交换机的资源以分布式的方式协同完成一个测量任务,以大流测量为例介绍测量资源动态分配及计数器配置算法.最后,实验结果表明所提出的方法可行并且具有一定的优越性.

摘要：随着《建筑工程抗震管理条例》的正式实施,医疗类建筑采用隔震减震技术将越来越普遍。以某不规则医疗建筑的隔震设计为案例背景,采用GB/T 51408—2021建筑隔震设计标准整体分析方法进行隔震设计,介绍了整体分析方法的设计流程及设计要点。结合案例存在多项不规则的特点,阐述了隔震设计的性能目标设定、隔震支座布置、隔震设计流程等要点,通过计算分析表明,结构的各项指标均满足要求,并补充罕遇地震作用下的弹塑性时程分析,结果显示结构的支座参数等均能满足规范要求,罕遇地震下结构耗能主要以隔震支座耗能为主,上部结构构件损伤较小,可见结构具有较好的隔震效果,能够满足预期性能目标,可以为类似的存在多项不规则的隔震项目提供一定的参考。

摘要：近年来,数字孪生技术在水利领域正在快速发展。其中,数字孪生数据底板存储着水利工程全生命周期中的信息,存在数据量庞大、管理复杂、更新成本增加等问题。同时,以WebGL为核心引擎渲染加载的应用层数字孪生平台受网络带宽和计算机性能的限制,面临着轻量化处理的挑战。针对数字孪生虚拟实体维度中的几何模型数据,利用改进QEM(Quadric Error Metrics,二次误差测度)算法和Low-Poly算法进行轻量化处理,选取水轮机导水机构作为案例,研究在满足数字孪生业务需求下的最优简化程度。结果表明:轻量化的处理是必要的;轻量化处理后的模型文件大小大幅度减小;在满足数字孪生精细度等级4个精度等级的简化程度的上限分别为原始数据、40%左右、70%左右、98%左右。

摘要：随着人口老龄化进程的加快,老年人在地铁出行中面临的问题日益突出,地铁站空间适老化设计对提升老年人的出行体验和生活质量至关重要。本研究从情感化理论出发,分析老年人的生理和心理特征,构建老年人在乘坐地铁过程中的流程与痛点图。通过调查问卷收集老年人对地铁站适老性评价,分析并总结他们对地铁站空间的需求。根据分析结果,徐州市地铁站空间适老性评价得分从高到低依次为安全性、便利性、舒适性和愉悦性,且各项得分偏低。基于此,结合情感化设计的三层次理论提出地铁站空间适老化设计策略。

摘要：Electronic skins and flexible pressure sensors are important devices for advanced healthcare and intelligent *** is a key parameter of flexible pressure *** introducing surface microstructures in a capacitive-type sensor can significantly improve its sensitivity,the signal becomes nonlinear and the pressure response range gets much narrower,significantly limiting the applications of flexible pressure ***,we designed a pressure sensor that utilizes a nanoscale iontronic interface of an ionic gel layer and a micropillared electrode,for highly linear capacitance-to-pressure response and high sensitivity over a wide pressure *** micropillars undergo three stages of deformation upon loading:initial contact(0-6 k Pa)and structure buckling(6-12 k Pa)that exhibit a low and nonlinear response,as well as a post-buckling stage that has a high signal linearity with high sensitivity(33.16 k Pa-1)over a broad pressure range of 12-176 k *** high linearity lies in the subtle balance between the structure compression and mechanical matching of the two materials at the gel-electrode *** sensor has been applied in pulse detection,plantar pressure mapping,and grasp task of an artificial *** work provides a physical insight in achieving linear response through the design of appropriate microstructures and selection of materials with suitable modulus in flexible pressure sensors,which are potentially useful in intelligent robots and health monitoring.

摘要：将非结构化VOSET方法推广至求解气液界面存在相变的流动传热问题.为准确计算界面两侧因相变导致的能量跳跃,给出了含界面非结构网格控制单元温度的计算方法,并对非界面网格温度场采用隐式求解以提高计算精度.为验证所构建相变模型的正确性,编写程序分别模拟了恒壁面过热度和恒热流密度两种边界条件下的水平表面膜态沸腾,计算结果与Klimenko经验关联式吻合良好.通过圆弧表面膜态沸腾问题,验证了本文基于带相变非结构VOSET方法对不规则区域沸腾相变问题的适用性.通过模拟近临界压力水的膜态沸腾问题,并与Berenson和Klimenko经验关联式对比,验证了本文方法对实际沸腾问题的适用性.