Tension and compression of bulk Al-7.5 wt% Mg alloy

The mechanical behaviour of bulk ultrafine-grained Al-7.5 wt% Mg alloy consolidated from cryomilled powders has been investigated. The experimental data show that the alloy exhibits high strength, low strain hardening, serrated flow and relatively high ductility. In addition, the data indicate that the yield strength in tension is essentially equal to that in compression. The yield and flow strengths of the alloy are discussed in terms of strengthening processes that are related to grain size, the Orowan mechanism and solid-solution hardening. The serrations in the stress-strain curve are discussed in terms of dynamic strain ageing and deformation twinning.     

Nature of shear flow lines in equal-channel angular-pressed metals and alloys

The nature of shear flow lines in equal-channel angular-pressed (ECAPed) metals has been investigated experimentally and theoretically. Experimental results indicate that, for metals pressed in a right-angle die, the shear flow lines often have an angle of ～27° with respect to the extrusion direction. It is suggested that the shear flow lines are composed of a group of elongated grains with an elongation direction that deviates slightly from that of the shear flow lines.     

Thermophysical properties of undercooled liquid cobalt

The surface tension of undercooled liquid cobalt has been measured by the oscillating-drop technique combined with electromagnetic levitation. The accuracy of the method was verified by measurements of the surface tension of liquid nickel. The liquid cobalt was undercooled by up to 231K (0.13T _m), and its surface tension determined to be σ_Co =1875 0.348(T-T _m)mNm^-1. From this result, the viscosity, self-diffusion coefficient, density and thermal diffusivity of undercooled liquid cobalt were derived. Using these thermophysical parameters, the growth velocity of cobalt dendrite is calculated and shown to agree well with experimental results. Furthermore, the Marangoni number and the Rayleigh number are calculated; these increase slowly with increasing degree of undercooling.     

通货膨胀、通货紧缩和产品类型对货币幻觉的影响

货币幻觉是指经济交易活动中,人们因倾向于以货币的名义价值而非实际价值思考从而对其消费和投资行为造成影响的一种认知偏差。本研究探讨了在通货膨胀和通货紧缩下以及产品类型对货币幻觉程度的影响。研究发现,在通货膨胀或通货紧缩下,大部分被试判断经济状况时不受货币名义价值的影响,而判断快乐程度和离职意向时受到货币名义价值的影响;在相同的涨价幅度下被试对日常消费品和昂贵消费品涨价幅度的判断差异显著,昂贵消费品引起人们更高程度的货币幻觉。     

The Attitudinal Entropy (AE) Framework as a General Theory of Individual Attitudes

Abstract

This article introduces the Attitudinal Entropy (AE) framework, which builds on the Causal Attitude Network model that conceptualizes attitudes as Ising networks. The AE framework rests on three propositions. First, attitude inconsistency and instability are two related indications of attitudinal entropy, a measure of randomness derived from thermodynamics. Second, energy of attitude configurations serves as a local processing strategy to reduce the global entropy of attitude networks. Third, directing attention to and thinking about attitude objects reduces attitudinal entropy. We first discuss several determinants of attitudinal entropy reduction and show that several findings in the attitude literature, such as the mere thought effect on attitude polarization and the effects of heuristic versus systematic processing of arguments, follow from the AE framework. Second, we discuss the AE framework’s implications for ambivalence and cognitive dissonance.     

The Contextual and Compositional Associations of Social Capital and Subjective Happiness: A Multilevel Analysis from Seoul, South Korea

Although studies on the association between social capital and subjective well-being have been recently increasing many issues still remain unsolved. The purpose of this study is to investigate the association between various social capital dimensions both at the individual (political participation, network source, trust, and organizational participation) and area level (voting rate, trust, and organizational participation) and subjective well-being (happiness) using multilevel analysis while controlling for various control variables at multiple levels. Survey data was collected from December, 2010 to April, 2011 in Seoul, South Korea. The final sample was comprised of 4,585 respondents within all 25 administrative areas in Seoul. Results from the multilevel analysis revealed that all individual and area level (trust) social capital variables are positively associated with subjective happiness. Our findings also point to the need for more sophisticated studies with longitudinal datasets based on multilevel framework using instrumental variable analysis to clarify our knowledge regarding the effects of social capital on subjective well-being.     

Blue Monday Is Real for Suicide: A Case–Control Study of 188,601 Suicides

Many studies have reported that suicides tend to occur on Mondays. However, owing to a lack of controls, conclusive findings on the potential effects of a day of the week on suicides have been lacking. We analyzed public data for causes of death from 1997 to 2015 in the Republic of Korea. Accidental death was used as a control group. The probability of suicide on each day of the week according to age group was calculated. A total of 377,204 deaths (188,601 suicides and 188,603 accidental deaths) were used. The frequency of suicide was highest on Monday and decreased throughout the week until Saturday. Accidental death was highest on Saturday and showed no variations according to weekday. For people in their teens and 20s, the probabilities of suicide on Monday were 9% and 10% higher, respectively, than those on Sunday. As age increased, the differences in suicide probability according to the day of the week were attenuated. The so‐called Blue Monday effect is real, particularly for people in their teens and 20s. Suicide prevention strategies that aim to attenuate the burden and stress of Mondays should be planned.     

清光绪皇帝为广州六榕寺赐匾考

<正>2019年7月,笔者来到位于台北士林外双溪流域的故宫博物院,在图书文献馆查询到一份清代中央政府军机处关涉六榕寺的密档折件,题为《奏报恩赐捐银兴学之六榕寺僧铁禅[1]匾额事(折片)》。这份奏折是时任头品顶戴兵部尚书衔署理两广总督岑春煊所呈,落款日期为"光绪三十年二月二十八日"[2]。台北故宫博物院图书文献馆报请馆方,最终同意将这份文献的原件扫描后免费供我学术研究及刊载使用。这份奏折亦是台北故宫博物院收藏关涉广州六榕寺的唯一官方档案原件,弥足珍贵。     

Taiwanese immigrant mothers' childcare preferences: socialization for bicultural competency

This paper explores how middle-class Taiwanese immigrant mothers in the United States defined the benefits of placing their children in predominantly White American childcare centers instead of using more culturally familiar forms of care. From in-depth interviews with seven Taiwanese immigrant mothers, it was learned that they viewed these settings positively, even though their children were not in cultural environments that mirrored their homes and ethnic communities. Mothers explained that they purposefully chose this type of setting because 1) they desired to develop their children's social competency in U.S. society; 2) they perceived U.S. childcare settings as multicultural and accepting of diverse cultures even if they were in the minority; and 3) they were confident that their children's participation in their own Taiwanese ethnic community would ensure the maintenance of their children's ethnic identity and knowledge of their parents' culture. For these reasons, they did not seek out race matching or cultural congruity between childcare centers and their homes. Instead, mothers viewed the childcare center as part of their overall socialization strategy for developing their children's bicultural competency in both their heritage culture as well as U.S. society.