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reduction in strength and bearing capacity after water immersion and the breakage of the structure under the combined action of soil self-weight pressure and additional pressure [42]. Therefore, loess...-qiong, LIAO Ming-sheng. Spatio- temporal characterization of a reclamation settlement in the Shanghai coastal area with time series analyses of X-, C-, and L-band SAR datasets [J]. Remote Sensing, 2018......
. [3] 徐振丽. 镁合金复合镀层结构和耐腐蚀性能研究[J]. 农机使用与维修, 2020(1): 30-32. XU Zhen-li. Study on the structure and corrosion resistance of magnesium alloy composite coating[J]. Agricultural Mechanization Using......
; (3) 式中:为有效应力.式(3)表示在有效应力和热激活共同作用下,位错可发生滑移,克服局部阻力.设作用在长度为l位错线的作用力为,x为位错..., and properties[J]. Journal of Propulsion & Power, 2006, 22(2): 361-374. [2] TAN X P, LIU J L, JIN T, et al. Effect of Ru additions on very high temperature creep properties of a single crystal Ni......
ASTM52100钢的4.45倍.高森等[32]采用同步送粉式激光熔覆在结晶器铜板表面分别制备组织细小致密的Ni基和Co基覆层,其硬度较电镀Ni,Co层分别提高了2.6倍和2.4倍,更是铜基体的6.5倍和6.2倍. WU等[33]在纯铜表面制备FeCoCrAlCuNix(x= 0.5, 1, 1.5)高熵合金(HEA)覆层,获得无裂纹无气孔的覆层,随着Ni含量降低,覆层硬度从522 HV(x=1.5)升高至636 HV(x=0.5),显微硬度的增加推测是由于固溶强化和铝与其他过渡金属间更强的p-d轨道结合的效果.高熵合金覆层能提高铜表面耐磨耐蚀性,其中Ni10 HEA (x=1.0)本征磨损率为9.31×10-5 mm3/(N·m),仅约为铜基体磨损率的22%. ZHANG等[34-35]利用激光熔覆在纯铜上制备多种Ni-Mn-Si与Ni-Cr-Si三元体系覆层.他们认为覆层中Ni-Si和Mn-Si硅......
; (1) where Fx, Fy and Fz are the static forces applied to the radial (x, y) and axial (z) directions, and Mx and My are the static moment loads around the x and y axes. The relative displacements and rotations between inner and outer rings are defined as d:  ......
性因素.若不存在激活函数,则输入和输出只能是简单的线性关系.常用的激活函数有Sigmoid,Tanh和Relu等.激活函数工作原理如图2所示,输入层输入参数x,经过突触权值wk相乘后,与偏置bk进行累加求和,通过激活函数Φ,得到激活值yk. 图2 激活函数 Fig. 2 Activation function Sigmoid函数值的范围在0~1之间,当输入值大于5或者小于-5,该函数就已经趋于1和0,映射的范围太小,非常容易饱和,训练效果明显降低,会产生欠拟合,分类效果会很差.Tanh函数值范围在-1~1,当输入值是比较大的正数时,将被映射成1,当输入值为较小的负数时,被映射成-1,均值为0.Tanh函数避免了Sigmoid函数可能会导致的梯度下降产生锯齿状波动的问题,但当输入值过大或过小时,梯度为0,同样会存在欠拟合的问题.Relu函数不存在这个问题,Relu函数的数学形式为:f (x......
with pyrometallurgical process[J]. Energy Saving of Nonferrous Metallurgy, 2015: 14-17. [38] NIU Q X, FU G X. Copper dross reverberatory structure reconstruction practice exploration[J]. Hunan Nonferrous Metals, 2011... 文献标志码:A 引文格式:周 毅, 蒋文龙, 查国正, 等. 从铅铜冶炼的副产物中回收共伴生贵金属[J]. 中国有色金属学报, 2021, 31(x): xxxx-xxxx. DOI: 10.11817/j.ysxb.1004.0609.2021-37835 ZHOU Yi, JIANG Wen-long, ZHA Guo-zheng......
横截面,拉伸力学试验样品沿着轧制方向制取,标距尺寸为40 mm×10 mm.钢/铝复合板的显微组织与拉伸断口形貌通过ZEISS Axio Scope A1光学金相显微镜和配备能谱分析仪(EDS)的JSM-6510LA扫描电镜(SEM)表征分析,金相腐蚀剂为4%(体积分数)硝酸酒精溶液.采用Ultima IV型X射线衍射仪(XRD)对钢,铝层沿复合界面剥离后的表面进行物相成分分析,用于确定钢/铝复合...; (1) 式中:x表示单层金属在复合板中的厚度占比.复合板的屈服强度,抗拉强度与式(1)计算值相比均略有偏大,表明冶金结合界面有利于钢,铝层之间产生协同变形,改善了复合板的强度性能.然而,复合板的断......
for the cryogenic storage tank and the spar of wing structure of a human powered aircraft. The study established the capability of the established method to provide for more reasonable selections in comparison... was known as GRA that aids in ranking the material with respect to several criteria. The proposed GRA method makes global comparison instead of considering the hierarchy structure for the different......
. Fabrication and application of alumina nanoscale ordered array template[J]. The Chinese Journal of Nonferrous Metals, 2005, 15(5): 680-687. [23] LEI Y, ZHANG L D, MENG G W, LI G H, ZHANG X Y, LIANG C H, CHEN W, WANG S X. Preparation and photoluminescence of highly ordered TiO2 nanowire arrays[J]. Applied Physics Letters, 2001, 78(8): 1125-1127. [24] LIU Su-qin, HUANG Ke-long. Straightforward fabrication......