基于数据分布的聚类联邦学习

联邦学习(federated learning)可以解决分布式机器学习中基于隐私保护的数据碎片化和数据隔离问题。在联邦学习系统中,各参与者节点合作训练模型,利用本地数据训练局部模型,并将训练好的局部模型上传到服务器节点进行聚合。在真实的应用环境中,各节点之间的数据分布往往具有很大差异,导致联邦学习模型精确度较低。为了解决非独立同分布数据对模型精确度的影响,利用不同节点之间数据分布的相似性,提出了一个聚类联邦学习框架。在Synthetic、CIFAR-10和FEMNIST标准数据集上进行了广泛实验。与其他联邦学习方法相比,基于数据分布的聚类联邦学习对模型的准确率有较大提升,且所需的计算量也更少。     

聚氨酯对棉织物免烫整理的影响

在不同预聚反应条件（预聚物摩尔比、反应温度、反应时间）下合成的水性聚氨酯产品，研究其作为免烫整理添加剂，对棉织物免烫整理效果的影响。结果表明：预聚反应中，聚乙二醇分子量为400—800，能够提高整理织物的回复角；PE与TDI的摩尔比对提高织物回复角也有一定影响。     

Flexible,self-cleaning,and high-performance ceramic nanofiber-based moist-electric generator enabled by interfacial engineering

Due to their long-term stability, even under extreme conditions, oxide ceramics have attracted significant attention in emerging fields like moist-electric generation However, the inherent brittleness and low voltage output of oxide ceramic-based moist-electric generators (MEGs) limit their applications in wearable electronics. Herein, a facile strategy involving the combination of sol-gel electrospinning and calcination is used to fabricate flexible and freestanding TiO₂/ZrO₂ (TZ) composite nanofiber-based MEGs. The excellent flexibility of the TZ nanofiber membranes can be attributed to the suppression of their crystal structure transformation, dispersion of stress concentration, and reduction of crack propagation via interfacial engineering The porous structure of the electrospun nanofiber membrane features an abundance of charged narrow channels for the diffusion of water molecules and generates a streaming potential: The optimal voltage output reached ～0.8 V, which is the highest value reported for an oxide ceramic-based MEG. Furthermore, the as-fabricated nanofiber-based MEG exhibits good self-cleaning capability to degrade organic pollutants under ultraviolet irradiation. By integrating mechanical flexibility, high performance, and a self-cleaning effect, this work presents a new idea for exploring diverse, efficient, and wearable oxide ceramic-based MEGs.

     

单片机课程改革与嵌入式教学的思考

文章分析了高校单片机教学和专业人才培养现状，对单片机课程改革和嵌入式课程教学进行了思考，论述开展嵌入式教学的意义，嵌入式课程内容选取和如何开展嵌入式教学等问题。     

Defect agglomeration in ferroelectric ceramics under cyclic electric field

The agglomeration of point defects in ferroelectric ceramics could be driven by repeated domain switching under cyclic electric field. The evolution equation of pore concentration under cyclic electric field is derived, with the help of a relation between the pore concentration and the extent of pore agglomeration. The results of the simulation agree quantitatively with the experimental data. An integrated framework about the mechanisms of electrically induced fatigue is proposed, which links the mechanisms at different scales.     

Preparation of LiMn2O4 thin films by aqueous solution deposition

Cathode material LiMn₂O₄ thin films were prepared by aqueous solution deposition using lithium acetate and manganese acetate as starting materials. The structures, morphologies, and the first discharge specific capacity of the thin films were investigated as a function of annealing temperature and time. The cycling properties of the thin films were also examined. The results show that LiMn₂O₄ thin films prepared by this method are homogenous and crack-free. The thin film annealed at 750°C for 30 min has good rechargeability. The capacity loss per cycle is about 0.05% after being cycled 100 times.     

火试金中使用镁砂灰皿银的补正初探

本文介绍了火试金中镁砂灰皿二次试金银量校正法 ;通过实验确定了二次试金的配料方案、熔炼温度和时间 ;通过统计分析数据 ,计算出了不同物料银的合理的补正系数     

胶东换流站非电量保护“三取二”逻辑改造

2010年胶东换流站投运时,胶东换流站换流变压器非电量保护采用"双重化"配置,当有一套保护或者现场的非电量保护跳闸接点误动时,会造成单极闭锁,对山东电网安全稳定带来重大影响。因此,对换流变压器非电量保护进行"三取二"逻辑改造,即当三个跳闸接点中的两个跳闸接点导通时,才允许出口闭锁直流,大大减少了因保护设备或跳闸接点误动带来的安全隐患。胶东换流站直流场非电量保护也存在类似的问题,故也对其进行了"三取二"逻辑改造。     

脑脓肿9例CT误诊原因分析

CausesAnalysisof9BrainTumourCaseslncorrectDiagnosisXiaLiMing;ZhaoJidong;ZhangShizhong(No.1People'sHospital,ShishuiCountryShandong,273200)我院1993年5月～1998年10月共收治脑脓肿32例．其中CT初次检查误诊9例（28．1％）,4例手术后病理证实,3例多次复查证实,现就其误诊原因进行讨论。l临床资料正．1一般资料本组男6例,女3例;年龄用～65岁,平均49．l岁;其中30岁以下1例,31～50岁2例,51岁以上6例。有肺癌手术病史2例,胃癌、卵巢癌手术病史各1例,颅脑外伤手术史1例。1．2临床表现头痛最为多见9例,呕吐6例,抽搐…     

安全自动装置升级改造动作行为分析

通过分析丰镇发电厂改造后安全自动装置的功能及不足之处,提出了相应的事故处理方案,从而保证机组在事故情况下安全稳定运行。