应用改进的快速边界搜索法对Y系列电机进行节材优化

本文结合电机设计的实际,对快速边界搜索法进行了研究改进.针对某些离散变量对目标函数和约束函数起决定性影响这一具体特点,提出了检查潜在好点的算法,从而形成了新的优化软件,本文对Y系列三相鼠笼式异步电动机按系列设计原则进行节材优化计算,结果令人满意.实算证明,算法是有效的,具有工程实用价值.     

13C标记和未标记果糖化赖氨酸"一釜法"合成工艺的研究

为了能够快速、高效合成果糖化赖氨酸及其~(13)C同位素标记物,分别以~(13)C同位素标记、非标记的葡萄糖和Fmoc保护赖氨酸为原料,通过对阿马德里反应与Fmoc脱除反应的工艺条件进行系统优化,建立了串联"一釜法"合成工艺。该方法大幅提升了果糖化赖氨酸的合成效率,为实现果糖化赖氨酸的工业化生产奠定了基础。     

锂离子电池负极材料多孔硅/硅铁合金的制备及性能

为改善锂离子电池硅负极材料的电化学性能,利用镁热还原法制备了不同铁掺杂量的多孔硅/硅铁合金复合材料,并对其结构以及在锂离子电池中的充放电性能进行了研究.材料均呈现多孔结构,硅铁合金均匀分布在孔道内部.多孔硅/硅铁合金复合材料具有较好的循环稳定性,在0.1C倍率下循环100圈后可逆容量为1 133.5 m A·h/g,容量保持率为66%;在1C倍率下可逆容量仍可以达到776.9 m A·h/g.     

FogMed: A Fog-Based Framework for Disease Prognosis Based Medical Sensor Data Streams

Recently, an increasing number of works start investigating the combination of fog computing and electronic health (ehealth) applications. However, there are still numerous unresolved issues worth to be explored. For instance, there is a lack of investigation on the disease prediction in fog environment and only limited studies show, how the Quality of Service (QoS) levels of fog services and the data stream mining techniques influence each other to improve the disease prediction performance (e.g., accuracy and time efficiency). To address these issues, we propose a fog-based framework for disease prediction based on Medical sensor data streams, named FogMed. This framework aims to improve the disease prediction accuracy by achieving two objectives: QoS guarantee of fog services and anomaly prediction of Medical data streams. We build a virtual FogMed environment and conduct comprehensive experiments on the public ECG dataset to validate the performance of FogMed. The experiment results show that it performs better than the cloud computing model for processing tasks with different complexities in terms of time efficiency.     

透明导电CuCr1-xMgxO2(x=0～0.08)薄膜的固溶度扩展和c轴外延生长

采用脉冲激光沉积(PLD)技术,在0～15°斜切的α-Al2O3(0001)衬底上生长了c轴外延的CuCr1-xMgxO2(x=0～0.08)系列薄膜.随Mg掺杂量增加,薄膜均为单相铜铁矿结构,表现出符合Arrhenius热激活模式的半导体电输运行为,室温电阻率单调下降2～3个数量级,热激活能由0.22 eV下降至0.025 eV,由此推断薄膜中Mg的固溶度至少为0.08,与多晶(～0.03)相比显著扩展.这是由于PLD薄膜生长具有非平衡、瞬时爆炸特征,使靶材第二相(MgCr2O4)中的Mg重新以等离子态定向运输到衬底上,迁移固溶到薄膜晶格中,固溶度扩展.薄膜(x=0,0.02)在380～780 nm可见光区的透过率为60％～80％,直接光学带隙Eg分别为3.06 eV、3.04 eV.更多Mg2+替代Cr3+时,会在价带顶上方引入受主能级并展宽,使热激活能显著下降,产生更多空穴载流子,透过率和光学带隙略有下降;Mg固溶到晶格中,促进薄膜层状晶粒长大,外延性提高,使电阻率进一步下降.     

振动对光纤陀螺线形测量系统影响分析

在使用光纤陀螺测量系统对桥梁线形进行测量的过程中,由于线形测量结果是通过积分算法得到的,所以来自汽车发动机和路面不平的振动影响会给测量结果带来巨大的误差,并且这类误差会随着测量时间和距离的增加变得越来越大,呈现出发散的特性;为了减小这些振动给测量结果带来的误差,可以使用时频分析的手段,通过时间信息和运动速度得到位置和路况信息,进而得到不同路况下的频域特点;选择路面完好的路段进行实验,点状减速带代表路面不平,使用Morlet小波对光纤陀螺采集到的信号进行时频分析,发现了不同工况下带来的振动噪声信号的频域特点,并且确定了27 Hz以上均为振动带来的噪声信号;在实际对某跨江大桥的线形测量中,使用切比雪夫滤波器去除光纤陀螺所采集到27 Hz以上的噪声信号,相比没有使用低通滤波处理的线形,测量精度提高了50%。     

全球宽带接入市场发展趋势

从用户数持续快速增长、宽带用户数最多的国家和地区、宽带用户增量、宽带用户增长率以及宽带业务普及率等5个方面阐明了全球宽带接入市场的总体情况。分析指出宽带接入技术发展趋势．DSL在近两年内仍将占据主流地位。介招了宽带增值业务发展情况。     

浅谈数码印花技术在服装设计中的应用

文章对数码印花技术的特点及优势进行了介绍,详细分析了其在服装设计中的应用,并探讨了数码印花技术在服装领域的应用前景。     

NiFe2O4–Ni3S2 nanorod array/Ni foam composite catalyst indirectly controlled by Fe3+ immersion for an efficient oxygen evolution reaction

A NiFe alloy was designed on nickel foam (NF) as a precursor using cathodic electrodeposition. NiFe₂O₄–Ni₃S₂ nanorods (NRs) composite catalysts were prepared by Fe³⁺ impregnation and further hydrothermal sulfuration methods. NiFe₂O₄–Ni₃S₂ nanosheets (NSs) were also prepared by direct hydrothermal sulfuration of the NiFe alloy for comparison. Compared to the dense NS structure of the NiFe₂O₄–Ni₃S₂ NSs/NF, the NiFe₂O₄–Ni₃S₂ NRs/NF showed better oxygen evolution performance due to its unique weed-like NR array structure composed of additional oxygen evolution reaction (OER) active sites, with a strong electron interaction for Ni and Fe and the active sulfide synergistic effect with oxides. Therefore, Driving a current density of 10 mA cm^?2 only requires an overpotential of 189 mV and the catalyst could provide 100 mA cm^?2 continuously and be constant for more than 80 h in 1.0 M KOH. This experiment indicated that Fe³⁺ immersion had an indirect regulating effect on the morphological growth of the catalyst, which provided a novel concept for designing better OER catalysts.