(Fe_(0.86)Zr_(0.033)Nb_(0.033)B_(0.068)Cu_(0.01))_x(Al_2O_3)_(1-x)颗粒膜的霍耳效应

用磁控溅射方法制备了系列 (Fe0 .86 Zr0 .0 33Nb0 .0 33B0 .0 6 8Cu0 .0 1 ) x(Al2 O3) 1 -x颗粒膜样品 ,体积百分比x从 0 .3 3～ 0 .63 ,样品厚度约为10 0nm。室温下在Fe0 .86 Zr0 .0 33Nb0 .0 33B0 .0 6 8Cu0 .0 1 体积百分比x =0 .43时得到 17.5 μΩ·cm的最大饱和霍耳电阻率 ,比纯铁磁金属提高了 3～ 4个量级。对其磁性和微结构进行了研究 ,样品霍耳电阻率随外场的变化曲线 ρxy～H与磁场平行于膜面时的磁化曲线M～H有相似性 ,说明霍尔电阻率 ρxy与磁化强度M相关。样品电阻率 ρxx随金属体积百分比x的减小而增加 ,在x =0 .43附近发生突变 ,从金属导电变为绝缘体。根据微结构和输运性质对可能的机制进行了探讨     

ZG3Cr13钢经长期时效后组织及硬度的研究

研究了ZG3Cr13钢在550℃～600℃的工作温度区间经2500h长期时效后的硬度及组织的变化。结果表明，在时效1000h内，硬度有明显的下降，之后趋于稳定；组织变化与正常处理后的组织均匀化程度有关，原始组织越均匀组织稳定性和热强性越高。     

镁合金表面喷铝防腐蚀层的微观组织分析

在AZ91D镁合金表面热喷铝，用以提高其表面的耐腐蚀性能。采用SEM，EPMA等方法对AZ91D表面喷铝扩散层的组织进行了仔细的观察与分析，发现在防腐蚀层上有大量的Mg17Al12相存在，且呈决状及非连续片状分布。经显微硬度测定，喷铝层硬度较镁合金基体高；腐蚀后这种相凸出于基体，比镁合金基体有较好的耐腐蚀性能。     

Psychometric considerations in the dimensional analysis of subjective picture quality

A discussion of the factors involved in the subjective perception of television picture quality is presented. Much of the work in this field is cited, and it is concluded that future work needs to consider a broader range of variables than has been looked at so far.     

残留奥氏体对1500MPa级新型低碳Mn-Si-Cr系合金钢冲击韧度的影响

15 0 0MPa级无碳化物贝氏体 马氏体复相钢的第一类回火脆性开始温度高于 36 0℃。实验表明 ,这并非由于贝氏体 马氏体复相韧化 ,而是与无碳化物贝氏体中的膜状残留奥氏体有关。无碳化物贝氏体中机械稳定性较高的残留奥氏体可能是导致无碳化物贝氏体 马氏体复相钢第一类回火脆性开始温度升高的直接原因。     

Cold Gelation of β-lactoglobulin in the Presence of Iron

ABSTRACT: To protect and transport iron, we investigated the trapping properties of a network formed from β-lactoglobulin. We studied the influence of different parameters—pH, iron, and protein concentrations—on gel properties (optical and mechanical properties, WHC, and microstructure). For all conditions tested, the results show the formation of a cold gel in the presence of iron. The mechanical properties reveal that the elastic behavior and the strength of rupture increase with higher protein concentrations and decrease with higher iron concentrations. The water-holding capacity is high for low iron concentrations. The microstructure shows that, at low iron/protein ratios, a homogeneous filamentous network is obtained whereas, at high iron/protein ratios, more random aggregated particles are present.     

Recovery retardation in equal channel angular pressed Al–Zr alloy during friction stir welding

The effect of Zr on reduction of hardness and microstructure in an FS weld of equal channel angular-pressed Al alloy was investigated. Zr addition to Al suppressed dynamic recovery in the thermomechanically affected zone and enabled retention of the high hardness of the ECA-pressed material throughout the weld.     

用于二维非线性静磁场计算的微型计算机程序TRIM／PC

一、引言TRIM是一个相当成熟的解二维非线性静磁问题的计算程序,它在束流光学系统设计中起着越来越重要的作用。最原始的TRIM程序是A.M.Winslow(Lawrence Radi-ation Laboratory,Livermore,California)编写的,后来又经多次修改扩充,并能运行在CDC-6600,IBM-360等中型计算机上。近年来,微型计算机的应用有了很大的发展,IBM-PC/XT或其兼容机在国内已相当普及。在微型机上运行应用软件会更有利于软件的     

Al-Cu-Fe系初生准晶相凝固过程的电子显微分析

采用包括金相（OM），粉末X射线衍射（XRD），扫描电子显微镜（SEM）观察和透射电子显微（TEM）分析等方法，研究了铸态Al592.Cu36.8Fe3.0Si1.0合金（700℃保温2．5h后水淬）的显微组织及相组成。发现铸锭中存在4种相：准晶I相，τ3相（或φ相），θ－Al2Cu相和η－AlCu相，凝固过程可描述为：初生晶是准晶Ⅰ相；在保温过程中发生包晶或共晶反应（L＋i→τ3(或φ）或L→τ3（或φ）＋i)形成的τ3相（或φ相），呈微畴结构；而剩余液体水淬形成θ－Al2Cu相和η－AlCu 相。