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数学概念是反映数学对象的本质属性和特征的思维形式,它是数学计算知识、判断、推理和证明的根本依据。因此,教师在教学中必须想方......
Synthesis,characterization and catalytic behaviour of La_(2-x)Sr_xCo0_4±λ(x=0—2)in complete oxidatio
A series of mixed oxides La_(2-x)Sr_xCoO_4±λ(x=0—2)with varying x values was synthesized.The crystal structure of th......
合成了x值不同的La_(2-x)Sr_xCoO_4±λ(x=0~2)系列复合氧化物.用XRD研究了这一系列氧化物的晶体结构,结果表明x在0.25~1.5之间可形......
采用放电等离子烧结(SPS)工艺制备了Mg2-xNdxNi(x=0,0.1,0.2,0.3)储氢合金.通过X射线衍射(XRD)和扫描电镜(SEM)研究了合金的相结构......
通过研究Fe-10Al,Fe-5Cr-10Al和Fe-10Cr-10Al(原子分数,%)合金在900℃的氧化行为,分析了二元Fe-Al合金形成选择性氧化铝膜所需的临......
系统研究了Nd0.5Ca0.5Mn1-xAlxO3(x=0,0.03)单相多晶样品在低温下的电磁性质和超声特性.电阻和磁化率测量表明,Nd0.5Ca0.5O3体系在TCO-2......
Magnetism, Electronic Transport and Infrared Absorption Spectra in Perovskite Manganite La_(0.67-x)D
Polycrystalline samples La0.67-xDyxCa0.3MnO3 (x=0~0.6) were prepared by traditional solid-state reaction method. The magn......
研究了Be部分替代Al对Al85Gd7Ni8合金的玻璃形成能力和初晶化的影响。结果表明,当Al-Be-Gd-Ni合金中Al/Be比例为二元Al-Be系的固溶......
Electrochemical synthesis of ammonia using a cell with a Nafion membrane and SmFe_(0.7)Cu_(0.3-x)Ni_
Samaria-doped ceria Ce0.8Sm0.2O2-δ(SDC) and SmFe0.7Cu0.3-xNixO3 have been synthesized by the sol-gel method and charact......
研究了Cu含量变化对La0.6Nd0.4Ni4.8Mn0.2Cux(x=0,0.1,0.2,0.3,0.4)合金系的晶胞参数、热力学性能以及贮氢性能的影响,讨论了晶胞......
Influences of Ti substitution on the structure and electrochemical properties of Mg_(1-x)Ti_xNi(x=0,
MgNi-based hydrogen storage alloys Mg1–xTixNi (x = 0, 0.1, 0.2, and 0.3) were prepared by means of mechanical alloying.......
在以ADμC812为CPU的单片机数据采集控制系统的基础上 ,用汇编语言实现正态分布曲线函数计算、检验和曲线输出 ,为用单片机实现更......
为了改善 La-Mg-Ni 系 A2B7型电极合金的电化学循环稳定性,用 Pr 部分替代合金中的 La,并用熔体快淬工艺制备了La0.75-xPrxMg0.25N......
采用铜模吸铸法制备Cu46Zr47-xA l7Tix(x=0,1.5)大块非晶合金。用X射线衍射仪(XRD)确定合金的结构,采用差示扫描量热仪(DSC)对非晶......
为了改善Mg2Ni型合金的电化学贮氢性能,用La部分替代Mg,并用铸造及快淬工艺制备了Mg2-xLaxNi(x=0、0.2、0.4、0.6)贮氢合金。用XRD......
用真空电弧熔炼方法制备了Zr1-xScxMn0.6V0.2Ni1.2Co0.1(x=0~1)AB2型储氢合金,研究了Sc元素替代Zr对合金的微观组织结构、气态储氢......
采用铜模吸铸法制备了Fe64-xCoxNd7B25Nb4(x=0~40)块体合金,利用X射线衍射仪(XRD)、差示扫描量热仪(DSC)和振动样品磁强计(VSM)研究......
针对■ζ/■_t+u■ζ/■_x=0方程,本文首先讨论了在一般情形下所谓“先向前差、后中央差”差分格式的稳定性,并给出了稳定的条件。......
Cerium addition on pitting corrosion of(Cu_(50)Zr_(50))_(100–2x) Ce_(2x)(x=0, 1,2 and 3) metallic gl
The industrial application of metallic glass is a longstanding challenge for researchers in the field. Toward this objec......
采用真空感应熔炼方法制备了La_(1-x)Sm_xMgNi_(3.6)Co_(0.4)(x=0~0.4)合金,并系统研究了Sm替代La对合金相结构、形貌、以及贮氢性......
对LaMg0.25Ni4.0-xCo0.75Alx(x=00.3)系列合金进行了快速凝固处理(15m/s),系统研究了该条件下Al部分替代Ni对合金相结构和电化学性能的......
为了研究Mg3MnNi2储氢合金的电化学储氢性能,实验采用Co元素部分取代Mg3MnNi2合金中的Ni,用固相扩散法制备出Mg3MnNi2-xCox(x=0~0.......
核电用冷凝器的失效形式以腐蚀为主。利用电化学测试系统、XRD、OM、SEM和EDS等分析测试方法研究Cu-30Ni-XRE(X=0~0.213)合金耐腐......
Nanocrystalline and amorphous La_(2–x)Sm_xMg_(16)Ni+200wt.% Ni(x=0, 0.1, 0.2, 0.3, 0.4) alloys were prepared by mechani......