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on Miedema’s model[J]. Journal of Alloys and Compounds, 2010, 506(1): 377-387. [12] 孙顺平, 易丹青, 臧 冰. 基于Miedema模型和Toop模型的Al-Si-Er合金热力学参数计算[J]. 稀有金属材料与工程, 2010, 39(11): 1974-1978. SUN Shun-ping, YI Dan-qing, ZANG Bing. Calculation of thermodynamic parameters of Al-Si-Er alloy based on Miedema’s model and Toop model[J]. Rare Metal Materials and Engineering, 2010, 39(11): 1974-1978. [13] 孙顺平, 李小平, 卢雅琳, 李 勇, 黄......
H, WEN S P, LU J T, MI Z P, ZENG X L, HUANG H, NIE Z R. Microstructural evolution of new type Al-Zn-Mg-Cu alloy with Er and Zr additions during homogenization [J]. Transactions of Nonferrous Metals......
含量能提高合金的时效硬化与抗拉强度.综上所述,随着Cu元素含量的增加,合金中强化相的数量增多,密度变大,合金的强度也随之升高.但研究同样表明,当Cu含量超过5.6%时,合金强度基本保持不变,其断裂韧性却会随着Cu含量的增加而降低[10].在Al-Cu-Mg合金中添加微量的Ag,Er,Sc等贵金属元素也可以细化合金晶粒,显著提高合金的力学性能和抗疲劳性能[13-14],但是成本也会大幅度提高. 大应... conductivity of dilute Al-Sc-Zr-Er alloys[J]. Journal of Alloys and Compounds, 2017, 704: 683-692. [14] SUN F F, NASH G L, LI Q Y, LIU E Z, HE C N, SHI C S, ZHUO N Q. Effect of Sc and Zr additions......
working (the deformation is approximately 10%) followed by artificial aging [14,15]. The plates were butt-welded perpendicular to the rolling direction and the filler metal was ER 2325. Table 1 lists......
A. Computer-aided diagnosis of parkinson's disease using enhanced probabilistic neural network[J]. Journal of Medical Systems, 2015, 39(11):179-190. [25] ER O, TANRIKULU A C, ABAKAY A, et al. An approach......
, XIA Tian-dong, LAN Ye-feng, LI Peng-fei, FAN Lu. Effects of rare earth Er addition on microstructure and mechanical properties of hypereutectic Al-20% Si alloy[J]. Materials Science &......
Sm可以制备出具有低磁感温度系数的永磁材料Sm1-xDyx(Co0.695Fe0.2Cu0.08Zr0.025)7.2[18],Sm0.8Re0.2 (CobalFe0.22Cu0.06Zr0.03)7.4 (Re=Gd, Er)[19].通过降低Fe含量,增加Co含量可制备出使用温度达550 ℃的高温磁体.YU等[20]通过调整Fe和Cu含量,在500 ℃获得Br=0.765 T,Hcj...- reorientation-transition cell boundary phases[J]. Applied Physics Letters, 2015, 106(5): 052408. [19] 胡新建, 王会杰, 郭朝晖. 具有低温度系数的Sm0.8Re0.2(CobalFe0.22Cu0.06Zr0.03)7.4 (Re=Gd, Er)两种烧结磁体的磁性能比较[J]. 磁性材料与器件......
earth metals such as Er added to Al-Zn-Mg-Cu alloy and followed by heat treatment will enhance ductility, strength and conductivity, thereby increasing SCC resistance of the alloy [36]. The additions... of the unrecrystallized grains which have ability to enhance the resistance to stress corrosion cracking, ductility, fracture and toughness and strength [34]. The combined additions of Zr, Er and Cr to Al-Zn-Mg-Cu......
双金属Hg2+和Cu2+对木瓜蛋白酶活性与构象的影响 张存滢,曾虹燕,熊龙斌,刘学英,Gohi A,蔡西玲,陈泽新 (湘潭大学 化工学院,湖南 湘潭,411105) 摘要:研究双金属Hg2+和Cu2+对木瓜蛋白酶活性与构象的影响.利用FT-IR,荧光发射以及紫外吸收光谱探讨Hg2+和Cu2+处理与木瓜蛋白酶二级结构变化的关系.研究结果表明:金属离子与木瓜蛋白酶活性之间存在剂量-效应关系,表现出低剂量促进,高剂量抑制的Hormesis现象.低浓度下,双金属Hg2+和Cu2+表现出协同激活效应;高浓度下,Cu2+的添加屏蔽了Hg2+的抑制作用.双金属离子浓度为10-6 mol/L Hg2+和10-......
; 斜条分受力分析及安全系数计算 图1所示为一般情况下斜条受力分析.斜条分参数如下(见图1(a)):P1和P2分别为斜坡坡趾点和坡顶点;A和B分别为滑动面下,上滑出点;L为下,上滑出点A和B之间垂直斜条划分方向的长度;△为斜条倾角,即斜条i的倾斜方向eg(et)与竖直方向的夹角,当以竖直线为基准时,顺时针为负,逆时针为正;αi为斜条i底面曲线中心点切线er与水平方向的夹角,即;Q为作用在滑动体上的......