Twinning stress prediction in bcc metals and alloys

The development of a twin stress relationship for bcc metals and alloys in agreement with experiments has been both scientifically challenging and technologically vital. A modified approach to Peierls–Nabarro model is formulated that predicts the twinning stress in excellent agreement with experiments. We utilize the first principles energy calculations to extract the energy landscape associated with twinning and obtain the disregistry function to account for the interaction of multiple dislocations comprising the twin. The metals and alloys considered include Fe, V, Nb, Ta, Mo, W, Fe–3at.%V, Fe–35at.%Ni and Fe–3at.%Si. The variation of twinning stress within metals is substantial (90–800 MPa) and depends primarily on the twin boundary migration energy, the shear moduli, the interplanar spacing and the geometrical positions of the fractional dislocations constituting the twin.     

Influencing surface plastic flow in metals using common chemical media

We demonstrate a unique mechanochemical effect – change in surface plastic flow by action of chemical media such as inks and glues – in large-strain deformation of metals. Unlike other well-known phenomena such as stress corrosion cracking and liquid metal embrittlement, the effect is not catastrophic and is largely material independent. High-speed in situ imaging shows that the media influence the flow by effecting a local ductile-to-brittle transition – from unsteady, large-amplitude, plastic folding, to repeated fracture and segmentation – with large decrease in deformation forces. The benign nature of the media offers opportunities for enhancing performance of metal cutting and deformation processes.     

Scaling of stacking fault energy and deformation temperature on strain hardening of FCC metals and alloys

The strain-hardening behaviour of metals and alloys are significantly affected by the dynamic recovery process, the rate of which can be increased by increases in deformation temperature and/or stacking fault energy (SFE). In the present work, the decay slope of the strain-hardening rate with flow stress as a function of both temperature and stacking fault energy is quantitatively evaluated for several face-centered cubic metals and alloys. A universal and quantitative approach to the scaling of the effects of temperature and stacking fault energy on strain-hardening behaviour is developed, which could be useful for predicting deformation behaviour or for material design.     

《道教义枢》中"道性"意蕴与佛性思想

道性思想是在南北朝时期受佛性思想的影响而发展起来的,至孟安排的<道教义枢>时已经形成了较为完备的道性理论.<道教义枢>中的道性思想既继承了传统道教的思想,又进一步吸收了佛教的重要思想.<道性义>用理和中道来解说道性,为修道成仙提供形上学的根据.进而,又彰显染净说来为道教完善修行解脱理论.道性思想对于道教的发展有着重要的方法论和本体论意义.     

论朱子性情关系中的性善论假设

在朱子性情关系的多重分析中,性善论只是一种假设。此种假设体现在“性体情用”原则中,体现在“心统性情”关系中,亦体现在“心贯已发未发”命题中。此种假设在朱子哲学中是可能与必要的。对于朱子性情关系中的性善论假设进行剖析,有助于为研究朱子哲学提供新的视角。     

Intuition and Nature in Kant and Goethe

Abstract: This essay addresses three specific moments in the history of the role played by intuition in Kant's system. Part one develops Kant's attitude toward intuition in order to understand how ‘sensible intuition’ becomes the first step in his development of transcendental idealism and how this in turn requires him to reject the possibility of an ‘intellectual intuition’ for human cognition. Part two considers the role of Jacobi when it came to interpreting both Kant's epistemic achievement and what were taken to be the outstanding problems of freedom's relation to nature; problems interpreted to be resolvable only via an appeal to ‘intellectual intuition’. Part three begins with Kant's subsequent return to the question of freedom and nature in his Critique of Judgment. With Goethe's contemporaneous Metamorphoses of Plants as a contrast case, it becomes clear that whereas Goethe can embrace the role of an intuitive understanding in his account of nature and within the logic of polarity in particular, Kant could never allow an intuition of nature that in his system would spell the very impossibility of freedom itself.     

Solid-solution hardening in dilute and concentrated alloys

Abstract

Numerical analysis of the temperature dependence of the critical resolved shear stress of several binary copper-based alloy single crystals containing 0·11 to 7·6 at.% Mn, 0·01 to 14·0 at.% Al, 0·5 to 8·0 at.% Ge and 5 to 30 at.% Zn, has been carried out in terms of the kink-pair formation model of solid-solution hardening. Several solute atoms are found to be involved in the unit activation process not only in concentrated alloys but also in dilute ones. A single mechanism of solution hardening, which involves the interaction between a dislocation and many solute atoms, is therefore operative in all the alloys referred to above.     

Differences in influence between pitched-from-vertical lines and slanted-from-frontal horizontal lines on egocentric localization

The visual field exerts powerful effects on egocentric spatial localization along both horizontal and vertical dimensions. Thus, (1) prism-produced visual pitch and visual slant generate similar mislocalizations of visually perceived eye level (VPEL) and visually perceived straight ahead (VPSA) and (2) in darkness curare-produced extraocular muscle paresis under eccentric gaze generates similar mislocalizations in VPEL and VPSA that are essentially eliminated by introducing a normal visual field. In the present experiments, however, a search for influences of real visual slant on VPSA to correspond to the influences of visual pitch on VPEL failed to find one. Although the elevation corresponding to VPEL changes linearly with the pitch of a visual field consisting of two isolated 66.5°-long pitched-from-vertical lines, the corresponding manipulation of change in the slant of either a horizontal two-line or a horizontal four-line visual field on VPSA did not occur. The average slope of the VPEL-versus-pitch function across 5 subjects was +0.40 over a ±30° pitch range, but was indistinguishable from 0.00 for the VPSA-versus-slant function over a ±30° slant range. Possible contributions to the difference between susceptibility of VPEL and VPSA to visual influence from extraretinal eye position information, gravity, and several retinal gradients are discussed.     

The Unnatural Nature of Nature and Nurture: Questioning the Romantic Heritage

From a cultural-historical perspective, nature and nurture (and thus education) are contested concepts. The paper focuses on the nature/nurture debate in the work of William Shakespeare (influenced by Montaigne) and in the Romantic tradition (evidenced by Rousseau and Wordsworth), and argues that while our Romantic inheritance (still highly influential in education) problematises nurture, it tends to mystify nature. Given that conceptions of nature are culturally driven, there is an urgent educational challenge to problematise nature as well as nurture.

政府与自然的和谐:节约型政府理念中的和谐社会

以新时期节约型政府理念的核心意蕴分析为视角,广义的和谐社会也就是一种政府与自然和谐的社会。其理论内涵的完整内容应既包括政府以及政府引导社会如何改造与利用自然以实现自身存在与发展的需要,也包括政府以及政府引导社会如何改造和完善自身以满足遵循与顺应自然的需要。构建政府与自然和谐的节约路径主要在于树立强化政府的节约意识和建立健全政府的节约制度。     

Meaning in Nature: Meaning in Life as a Mediator of the Relationship Between Nature Connectedness and Well-Being

Research has established nature connectedness as a reliable correlate of well-being. In the current research, we examined whether meaning in life mediated the association between nature connectedness and well-being. In Study 1, 311 undergraduates completed multiple measures of nature connectedness, multiple measures of meaning in life, and multiple measures of well-being. Mediational analyses revealed that meaning in life fully mediated the association between nature connectedness and well-being. In Study 2, we examined whether mediation of the association between nature connectedness and well-being by meaning in life could be demonstrated alongside a previously documented mediation of the association between religiousness and well-being by meaning in life. Undergraduates (N = 227) completed measures of nature connectedness, religiousness, meaning in life, and well-being. Mediational analyses revealed that meaning in life fully mediated both the association between nature connectedness and well-being and the association between religiousness and well-being.     

Nature and Self in New Age Pilgrimage

Several scholars have argued that New Age spirituality is best understood as a form of ‘self-spirituality’ and as an expression of the consumer capitalist tendency to commodify all things, in the process converting religion into a ‘spiritual marketplace’. This article examines the phenomenon of New Age pilgrimage, especially pilgrimage to natural ‘power places’, with a focus on New Age practices at Sedona, Arizona, USA. The author assesses New Age notions of sacred space, nature, and the self, and compares pilgrim practices and sensorial interactions with Sedona's red rock landscape to forms of tourist practice and commodification more prevalent in Sedona. He argues that New Age pilgrimage, in theory and sometimes in practice, rejects the consumerist impulse, and that the New Age ‘self’ is both more open-ended and ‘postmodern’, and less central to New Age practice, than is suggested by the characterisation of New Age as ‘self-spirituality’.     

Nature and nurture in own-race face processing

A standard visual preference task was used to examine 3-month-olds' looking times at own-race versus other-race faces as a function of environmental exposure to faces from the two categories. Participants were Caucasian infants living in a Caucasian environment, African infants living in an African environment, and African infants living in a predominantly Caucasian environment. The results indicate that preference for own-race faces is present as early as 3 months of age, but that this preference results from exposure to the prototypical facial environment.     

自然、文化和自然遗产：走向自然之文化

人们常把自然和文化看作是对立的。按这一看法,自然因为文化的发展或作用而逐渐衰落。人们需要根据“文化景观”的概念,对这两个术语间的关系进行新的分析。通过分析认识到,即使承认文化结构的创建作用,也可把自然视为是一重要的、独特的范畴。谈论并且追求自然的文化是明智的,所以人们不必把文化和自然考虑成彼此对立的,这些思考对自然遗产的保护具有重要的意义。     

无意识的意识本性

就精神分析的无意识而言,无意识实际上是由意识创建而来的。不是无意识派生了意识,而是意识派生了无意识。无意识是意识的一种变体,它恰恰体现了意识的塑造能力和它自身的可塑性。弗洛伊德在《意识与什么是无意识》中对意识和无意识的关系问题做了集中的论述。该文借助对这篇论文的全面解析进行阐述。