管线用高强韧性宽厚钢板的开发

本文回顾了舞钢高强韧性管线用宽厚钢板的研制开发过程，并结合生产工艺，对钢板性能作了全面分析，指导了钢管线钢的生产。舞钢X70级管线钢有较高的断裂韧性、良好的可焊性以及抗SSCC、HIC性能。舞钢正在进行技术改造，以进一步改善组织，提高性能、满足西气东输要求。     

补偿式光纤F—P干涉仪的信号处理系统

本文提出并研制成补偿式光纤F-P干涉仪信号处理系统,提出了用来测量微小位移信号的三种方法及电路,即透射峰时间间隔测量法、光脉冲基波幅度测量法(精密整流法)、鉴相法。测试结果表明:时间间隔测量法,它的最大灵敏度达到0.26纳米/微秒;精密整流法,最大灵敏度为2.38纳米/伏特。     

In-situ birefringence microscopy of uniaxially stretched metal-polymer laminate

This paper concentrates on revealing the local deformation as a function of applied strain in a polymer coating supported by a plastically deforming and roughening metal substrate. To this end in-situ birefringence microscopy measurements have been executed. The measurements are performed in reflection and an alternative unwrapping scheme for the optical path difference is proposed. From the characterization of PET (polyethylene terephthalate) coated stainless steel it is concluded that strain localization appears below the macroscopic strain at yield and that the surface roughness of the substrate is the driving force of the localization.     

Atomic force microscopic analysis of hydrogen peroxide bleached kraft northern black spruce fibres

Hydrogen peroxide is a potent, relatively inexpensive oxidant that chemically degrades chromophoric components in pulps and textiles. Oxidation of cellulose is a byproduct of this process step that decreases the tensile strength of individual fibres. The residence time of pulp in the bleaching reactor must be optimized to achieve the desired brightness and minimizing fibre degradation. To evaluate the impact of peroxide bleaching at the microfibrillar level, a single black spruce tree was chosen and kraft pulped. Peroxide bleaching was conducted via benchtop polyethylene bag bleaching in a temperature-controlled waterbath. Atomic force microscopy (AFM) topographical images acquired before and after the bleaching step show dramatic changes in fibre structure consistent with delignification and defects in the surface topography. This was further verified by X-ray work at Brookhaven National Laboratory, NY, U.S.A.     

网络环境下开发期刊信息资源的策略

论述了在信息技术高度发达的今天,图书馆期刊信息的特征和资源保障;提出在网络环境中开发期刊信息资源的主要策略,包括开展期刊目次报道、开展定题服务、网上期刊信息资源的开发、以及利用网络开展文献传递服务等.     

Models and observations of fcc/bcc interfaces

Whereas models of the structure and periodicity of CSL or near CSL high angle grain boundaries are relatively well developed and have been to some extent verified by experiment, the nature of more general (e.g. fcc/bcc) interfaces is very imperfectly understood. One of the major differences between homo- and heterophase boundaries is the occurrence, in the latter case, of reproducible orientation relationships due to the crystallographic requirements of phase transformation (e.g. a glissile interface for martensitic growth, low energy interfaces for classical nucleation). A review is given of the relationships commonly observed to obtain between fcc and bcc crystals (as well as ordered phases based upon these structures). Within a given relationship, it is possible to use models of the available interfaces to predict their dislocation content; the success of the various approaches is considered. It is shown that the dislocation arrays identified on fcc/bcc boundaries are consistent with the occurrence of a primary structural relaxation, but that the latter does not appear to be complete. Possible reasons for this are discussed, together with the extent to which secondary structural models may be applicable. Attempts to rationalize the observed orientation relationships and morphologies are discussed, and it is pointed out that these all rely on searches for situations of minimum primary misfit, but that the way in which the latter is quantified determines the results of the analyses. Nevertheless, the implication is that the primary misfit does appear to determine the actual behaviour, though no structural or mechanistic conclusions can safely be drawn from this observation.     

SEM observation of the “orange peel effect” of materials

This study investigated the peculiar “orange peel” effect often observed in nanomaterials using high-resolution scanning electron microscopes. The study used different materials, including semiconductor thin films and ceramic nanoparticles. The investigation established that the “orange peel” is of an artifact caused by the metallic coating of the samples in sample preparation. This discovery is important in eliminating the misinterpretation of such effect on the true surface feature of materials, hence avoiding the confusion in the discussion of the properties of nanomaterials.     

Cyclic X-Y mechanical tests: A new method to perform in situ reversed-deformation experiments in the high-voltage electron microscope

There has been, in the past, only limited success with in situ cyclic or reversed plastic deformation tests in the transmission electron microscope (TEM). This is probably partly due to problems associated with buckling of the foil when an applied tensile or shear stress is reversed. Mechanical analysis shows that dislocation movement can be reversed by tensile stressing in alternating perpendicular directions (i.e., 90° rotations of a tensile stress); thus buckling of the foil can be avoided. A design for performing such X-Y in situ TEM tests is presented, with observations that demonstrate its feasibility.     

管环缝射线一次透照长度及分段次数的计算

介绍了管环缝射线透照方式，以及环缝单壁外透法和环缝双壁单影法100％射线透照检查一次透照长度及分段次数的计算。