Deformation and failure of a heterogeneous high explosive

The deformation and failure of the pristine PBX 9501 high explosive are studied experimentally by combining Brazilian disk compression with the digital image correlation (DIC) technique. The Brazilian disk specimen was loaded by a pair of compressive forces across the diameter. The full-field deformation on the surface of the disk, during the loading process, was obtained using DIC on a series of random speckle images acquired during the test. In this series of experiments, we focused on the effect of temperature while keeping the loading speed quasi-static. Tests were conducted under three different temperatures, ?15°C, 23°C, and 50°C. For all testing conditions, it was observed that as the applied load reaches maximum, localized deformation starts at the two regions near the loading points. The localized deformation then proceeds along an irregular path toward the center of the specimen and coalesces. Finally, deformation of the Brazilian disk subjected to cyclic compressive load at ambient temperature was also measured and studied.     

Deformation twinning of Bi–Sb solid alloy formed under a strong gravitational field

We performed an ultracentrifuge experiment on Bi–Sb alloy. Deformation twins with misorientations of about 90° were observed in the low-gravitational region where grain refinement had not occurred. The twins were thicker than the conventional deformation twins and their thickness was proportional to the gravitational field. We found that the minimum gravitational field required for grain refinement was 0.17 × 10⁶ G at 240°C for periods <10 h.     

Twinning behaviour of TWIP steel studied by Taylor factor analysis

The twinning behaviour of Twinning-induced plasticity (TWIP) steel has been studied by analysing the grain orientation and the Taylor factor, based on microstructural and electron backscatter diffraction device observations. It is demonstrated that the Taylor factor can give an important guideline for determining the deformation mode of TWIP steel. The higher the Taylor factor, the easier the formation of twins and thus a tendency for the deformation mode to be mechanical twinning, while a low Taylor factor corresponds to a slip deformation mode. When the loading temperature is relatively low, the high Taylor factor regions increase and thus deformation twinning becomes easier while slip becomes more difficult, leading to increased tensile stress and decreased elongation.     

On the plasticity event in metallic glass

Based on a systematic molecular dynamics analysis, this study reveals that plastic deformation of metallic glass is not through a uniform configuration change but via many localized plasticity events. These events are manifested by the atomic clusters of high kinetic energy and high strain rate, emerging even in the elastic deformation regime. The life of such a plasticity event is on the order of 10^?12?s, during which the distribution of kinetic energy follows a power law. The study shows that yielding in metallic glass occurs at the sudden surge point of the number of plasticity events. In the steady plastic deformation regime, the continuous nucleation and annihilation of the plastic events lead to a steady flow stress and stabilized total potential energy.     

药物性肝损伤的发病机制

药物性肝损伤（DILI）可分为直接肝毒性和特异质性肝损伤（IDILI）.IDILI发生率较低,个体发病存在易感因素,在动物模型中很难复制.同时,IDILI缺乏可靠的临床诊断标准,使其发病机制的研究受到限制.近年来关于IDILI的发病机制,主要在遗传易感性、代谢途径、宿主免疫、线粒体毒性和胆道损伤等方面取得进展,各种发病机制的深入研究和相互关系的阐明,或将揭示IDILI的真正致病机制.     

Surviving or living? A question of containment

Abstract

This paper explores the establishment of a safe inner representation of a mother as a crucial containing experience that distinguishes surviving and living. A comparison is drawn between a client with a deprived early experience, who is turned into a refugee and is searching for a containing experience, and a refugee who has had a good inner experience and then loses it. The contrast between the two highlights how a refugee may have to shift from living to surviving. Survival is conceptualized in terms of a ‘fugitive state of mind’ which a refugee may come to occupy. Living is thought about as a state in which safety is not only contingent upon an external set of factors but vitally depends on the circumstances which allow for internal containment. In the last part of the paper emphasis is placed on needing to take account of these special needs for containment in addressing management practices and rehabilitation of refugees. It is suggested that doing so establishes the necessary conditions for containment while blindness to these needs impedes further rehabilitation and integration.     

The law and lawyers: Through psychodynamic eyes

Abstract

This article looks at some of the unconscious processes that operate among solicitors in general practice. In particular it considers various defences against the anxiety felt by solicitors partly because of the nature of their work and partly because of what is projected onto them by their clients. It argues that these defences have become embodied in the legal system itself as ‘socially structured defence mechanisms’ (Menzies Lyth 1989).     

Chapter 14: The Caleb Affect: The Oldest-Old in Church and Society

SUMMARY

Persons in North America who are over 80 years of age are generally overlooked by religious leaders. They are, however, the fastest growing cohort in society. This age crescendo promises to be a significant factor in the future ministry of the rapidly increasing number of graying churches and synagogues.     

前摄干扰对工作记忆的作用——大脑如何解决前摄干扰?

前摄干扰(PI)对工作记忆有决定性影响.注意加工理论认为处于工作记忆“注意焦点”的信息不受PI影响,偏向-竞争理论则提出个体对熟悉信息和情景信息代码做出权重评估,解决工作记忆PI效应.研究者从工作记忆编码和提取加工的PI效应、内容相关和情景相关的PI效应、PI消除的脑成像特征等角度进行了验证,多数结果支持偏向-竞争理论.未来研究应使用脑成像技术探讨PI效应与工作记忆子系统、子功能之间的关系等主题.     

The Dracula killer: A psychobiographical illustration of the Schahriar syndrome model for serial murder

This psychobiographical study of Richard Trenton Chase (1950–1980), a serial murderer, has the aim to uncover the psychic mechanisms characteristic of his functioning. The study included primary and secondary data sources. All materials collected and analysed, were published and publically available. The Schahriar syndrome model served as the conceptual framework for data framing and interpretation. Findings suggest that Chase exhibited five primitive psychic mechanisms namely: omnipotence, sadistic fantasies, ritualised performance, dehumanisation and symbiotic merger. The Schahriar syndrome model has utility to explain the psychological functioning of a serial murderer.