Extraordinary plastic behaviour of the γ′ precipitate in a directionally solidified nickel-based superalloy

The deformation behaviour of the γ′ precipitate in a directionally solidified nickel-based superalloy is investigated using microscopic observations after tensile testing at room temperature. It is found that coarse γ′ precipitates (604 nm) are sheared by strongly coupled dislocations, and some γ′ precipitates are elongated to approximately 3–6 times of their original lengths. It reveals that, at room temperature, the γ′ precipitate within the experimental superalloy has a significant plastic deformation capacity in comparison with Ni₃Al bulk alloys. Based on the experimental observations, the extraordinary plastic behaviour of the γ′ precipitate is analysed.     

Age differences in working memory— The roles of storage and selective access

Twenty-four young (23 years) and 24 old (71 years) adults performed arithmetic tasks with working memory loads ranging from 1 to 4. Age groups were equivalent in mean accuracy and speed of arithmetic operations under minimal working memory load, but old adults were slower than young with memory demands >1. Access to a new object in working memory as the basis of computation required additional time. This object-switching cost increased with increases in memory demand, but was unaffected by age, indicating that old adults have no deficit in selective access to working memory.     

Transformation defects on θ′ precipitates in Al–Cu alloys

Growth defects in the form of transformation disconnections (TDs) are considered for the precipitation of θ′ in an Al–Cu αsolid solution. The minimum sized TDs are predicted to be 1–2?nm in height, in agreement with experimental observations. One type of TD is glissile and the other (more prevalent) type is sessile, requiring climb for motion. The presence of a fault plane on one side of the sessile TD does not impede its formation. The results are in accord with symmetry theory and with the topological model for precipitation.     

Television viewing and perceptions of women’s roles on television and in real life

Television has been heavily criticized in the popular press for the way it depicts women. Narrow and stereotyped portrayals of women may, according to some writers, cultivate misconceptions among the public about the way women are or should be. In a new investigation of this issue a survey study was undertaken with a large British sample in the London ITV region in which data were obtained on TV viewing behaviours and perceptions of the way women are portrayed on TV and beliefs about how they are or should be in real life. Results showed that only weight of action-drama viewing was significantly related to respondents’ perceptions of women. Heavy viewers of action-drama content were more likely than light viewers to perceive women in reality as self-reliant, not quarrelsome with other women, not dependent on attractiveness to get on, and not preoccupied by romantic affairs. However, heavy action viewers also tended to believe that most women actually want to become mothers, and do not want careers, and more importantly that women ought to be like this. Only in some respects were these relationships consonant with those inferred by content analysts.     

The roles of sociosexual orientation and relationship status in women’s face preferences

Previous research suggests that sociosexual orientation and relationship status each predict women’s preferences for masculine men. However, if partnered women’s preferences primarily reflect the short-term (i.e., currently unfulfilled) aspect of a pluralistic mating strategy and unpartnered women’s preferences reflect the dominant aspect of their current mating strategy, then sociosexual orientation should predict the preferences of unpartnered women better than those of partnered women. Perceptions of other women’s attractiveness may show a similar pattern of individual differences, if such perceptions of other women’s attractiveness are important for intra-sexual competitive behavior. Consistent with these predictions, in the current study, analyses of the relationship between women’s face preferences and sociosexual orientation indicated that unpartnered women reporting greater willingness to engage in uncommitted relationships demonstrated stronger preferences for exaggerated sex-typical characteristics in men’s and women’s faces. For partnered women, no corresponding relationship between sociosexual orientation and face preferences was evident. Collectively, these findings suggest that individual differences in sociosexual orientation may be better predictors of face preferences among unpartnered women than among women whose long-term relationship goals are currently being met.     

The coupled effect of grain size and solute on work hardening of Cu–Ni alloys

A modified grain size-dependent model developed to capture the combined effects of solute and grain size on the work hardening behaviour of fine-grained Cu–Ni alloys is provided. This work builds on a recent model that attributes the grain size-dependent work hardening of fine-grained Cu to backstresses. In the case of Cu–Ni alloys, unlike commercially pure Cu, a grain size-dependent separation between the Kocks–Mecking curves develops, this being explained here based on an extra contribution from geometrically necessary dislocations in the solid solution alloy. This is corroborated by strain-rate sensitivity experiments.     

Being a good witness: The roles of benevolence and working memory capacity in rapport’s effect on eyewitness memory

Prior studies suggest that building rapport with eyewitnesses can produce measurable recall improvements, but the underlying mechanisms of rapport’s possible effects on recall remain underexplored. The present study investigated two possible mechanisms for rapport’s impact: (1) improved working memory capacity and (2) increased benevolence. Participants (N = 105) viewed a mock theft video, followed by one of two possible pre-interview interactions: rapport-building or a control interaction. Next, participants completed measures of working memory, altruism, and benevolence (pre-interview and post-interview), before recalling details of the theft. Analyses revealed that, when controlling for the effects of the interaction duration and participants’ pre- and post-interview benevolence, rapport did not affect eyewitness recall directly. However, rapport building did increase benevolence measured after and associated with the substantive eyewitness interview, which in turn predicted more accurate and new details reported, and fewer subjective/other details reported. These findings support benevolence toward the interviewer as a mechanism behind rapport’s effect on eyewitness recall. Implications for investigative interviews in relation to benevolence and motivating reciprocation are discussed.     

Individual differences in speakers’ perspective taking: The roles of executive control and working memory

Both speaking and listening require taking into account the perspective of one’s communicative partner. Is perspective taking a domain-specific process internal to the language production and comprehension systems? Or is it a domain-general process regulated by the same mechanisms that are used to regulate other forms of behavior? Past research has shown that listeners’ perspective taking is at least partially regulated by inhibitory control and working memory (WM), suggesting that it may be best thought of in domain-general terms. The present experiment was designed to explore individual differences in nonlinguistic executive functioning in order to assess whether domain-general mechanisms help regulate speakers’ perspective-taking behavior. A group of 60 speakers participated in a referential communication task and in tasks measuring WM and executive control (EC). The results revealed that WM and EC were both predictive of the speakers’ perspective taking, suggesting that perspective taking may be regulated by domain-general mechanisms.     

Who benefits from chatting, and why? The roles of extraversion and supportiveness in online chatting and emotional adjustment

The current study aimed to provide more insight into the role of online chatting in young adults' emotional adjustment. A model was tested that takes into account (a) extraversion of individuals who communicate online, (b) the kind of peers these individuals communicate with online (i.e., online-exclusive peers vs. friends), and (c) the extent to which effects of online chatting on emotional adjustment are mediated by individuals' ability to provide support to others. Young adults (age M = 18.9) filled out questionnaires about themselves and their fellow students at three measurements with a 4-month interval. Results showed that only for less extraverted individuals, chatting with peers found exclusively online directly predicted higher self-esteem and indirectly predicted less depressive symptoms through increases in supportiveness. Thus, results supported a model of social compensation where effects of online chatting with online-exclusive peers improved young adults' emotional adjustment.     

The Effect of Multiple Reference Points and Prior Gains and Losses on Managers′ Risky Decision Making

This study examines the impact of two contextual features of decision settings on managers′ risky behavior. Considerable research indicates that decision makers exhibit risk avoiding or risk taking behavior depending upon whether options are viewed as gains or losses with respect to a given reference point. We argue in this paper that multiple points of reference are important determinants of risky behavior in many decision contexts, and that research should explicitly consider their effect to fully understand and predict risky behavior. The analysis of contextual features is extended to consider the impact of prior gains and losses in the second part of the paper. Seventy-two professional corporate managers participated in two experiments that involved a corporate investment decision setting. The setting exemplifies a context that has both multiple important points of reference and prior gains and losses. The data indicated that the presence of multiple relevant reference points results in a complex pattern of risky behavior, where managers′ decisions to accept or avoid risk were affected by the relative positions of risky alternatives with respect to two important points of reference. In particular, a mixture of risk taking and risk avoiding occurred for options between the relevant reference points. The managers were also found to be more willing to accept risk after experiencing a prior gain as opposed to a prior loss. These findings point to the importance of considering such task characteristics when attempting to predict and understand risky behavior across a variety of task contexts.     

Precipitate characteristics and selected area diffraction patterns of the β′ and Q′ precipitates in Al–Mg–Si–Cu alloys

In this study, the precipitate characteristics and selected area diffraction patterns (SADP) of the β?′ and Q?′ precipitates formed at the over-aged state of Al–Mg–Si–Cu alloys are systematically investigated by means of high-resolution transmission electron microscopy and transition matrix. The β?′ precipitates have two cross-sections, rectangle-shaped and round-shaped aligned with [0?0?1]_Al direction, but only rectangle-shaped cross-section exists for Q?′ precipitates. And, both of them have 12 variants and orientations with Al matrix. However, there are only three different zone axes, [0?0?0?1]_β?′, [1?4?5?0]_β?′, and [5?4?1?0]_β?′ for β?′ precipitates, and [0?0?0?1]_Q?′, [1?4?5?0]_Q?′, and [3?2 1?0]_Q?′ for Q?′ precipitates, parallel to the [0?0?1]_Al direction when they are precipitated from the Al matrix, respectively. Then, a new [0?0?1]_Al SADP model, which superposes diffraction patterns of the β?′ and Q?′ precipitates, is established. Furthermore, some “cross-shaped” diffraction streaks appeared at over-aged state can be explained reasonably by this model, which is good in agreement with the experimental data.     

Beyond the heritability of life satisfaction – The roles of personality and twin-specific influences

In a behavior genetic design, we investigated individual differences in life satisfaction and its relation to personality with respect to both internal and external influences. We questioned the absence of shared environment and examined the specific contribution of additive and non-additive genetic influences. We also tested for twin-specific environmental influences in a total sample of 1308 dyads including identical and fraternal twins, siblings, mother–child and grandparent–child pairs. The results showed substantial shared environmental influences on life satisfaction that varied between twins and non-twins, supporting twin-specific environmental influences. Additive and non-additive genetic influences on life satisfaction were completely shared with personality. The remaining variance could be explained by unique non-shared environmental influences for life satisfaction independent of personality.     

“Other” behavior and the DRO: The roles of extinction and reinforcement

Jessel et al. (2015) provided some evidence to suggest that “other” behavior is strengthened in the differential reinforcement of other behavior (DRO). The present study is a systematic replication of the Jessel et al. procedures. The effects of DRO and extinction on target responding, target-other responding (a response with an established history of reinforcement), and nontarget-other responding emitted by children with intellectual and developmental disabilities and children with no known diagnoses were compared. Other behavior increased in at least one DRO condition for each participant, suggesting that other behavior increases when using DRO, at least initially. Under extinction, target responding and target-other responding decreased to low rates for three of the five participants; however, rates of nontarget-other responding were elevated compared to the DRO condition. These results suggest that increased rates of target-other responding and nontarget-other responding during the DRO condition may be a result of extinction-induced variability.     

Who is most likely to seek and give support in the face of agentic and communal threat? The roles of extraversion and agreeableness

Agentic threat tends to elicit support seeking and hinder support provision. Communal threat tends to elicit support seeking and provision. We examined whether the associations between threats and support are moderated by Extraversion and Agreeableness. Three hundred fifty undergraduate students completed questionnaires twice daily across one week, reporting the worst stressor of the half-day, appraisals of agentic and communal threats, and efforts to seek and provide support. In response to agentic threat, those higher in Extraversion increased their support seeking and decreased their support provision to a greater extent than those lower in Extraversion. In response to communal threat, those higher in Agreeableness increased their support seeking and provision to a greater extent than those lower in Agreeableness.     

Attentional spreading in object-based attention: The roles of target–object integration and target presentation time

What is the best account to explain the object-based attentional benefit—that is, the spread of attention within an attended object or prioritization of search across possible target locations within an attended object? Using a task in which the location of the target was known with certainty, in the present study we systematically manipulated the type (letters or bites) and the presentation time (long or short) of the target and flankers in order to test the effects of target–object integration and target presentation time on object-based attention. The results showed that an object-based effect could appear when the target was a bite, no matter whether the target presentation time was long or short; but when the target was a letter, an object-based effect was only observed when the target presentation time was short enough. These findings provide additional evidence supporting the argument of attentional spreading in object-based attention. However, this spreading is moderated jointly by target–object integration and the target presentation time.     

Alloying effects on sulphur embrittlement of the γ-γ′ interface of nickel-based single-crystal superalloys

Fully first-principles calculations have been performed to investigate the alloying effect on the sulphur embrittlement of the n - n ' interface of nickel-based single-crystal superalloys. The shear and cohesive strengths of the inter-face are calculated in terms of Mayer bond orders (BOs), and the ratio R BO of shear strength over cohesive strength is analysed as a function of alloying element substitution. The interface characteristics are also studied using the electron charge-density distribution. It is found that the interplay between shear and cohesive strengths has a significant influence on the interfacial embrittlement. Using the phenomenological theory of fracture as well as the calculated ratio R BO, we propose a new mechanism responsible for relieving sulphur embrittlement of the n - n ' interface through alloying substitution.     

The effect of experience and of dots’ density and duration on the detection of coherent motion in dogs

Knowledge about the mechanisms underlying canine vision is far from being exhaustive, especially that concerning post-retinal elaboration. One aspect that has received little attention is motion perception, and in spite of the common belief that dogs are extremely apt at detecting moving stimuli, there is no scientific support for such an assumption. In fact, we recently showed that dogs have higher thresholds than humans for coherent motion detection (Kanizsar et al. in Sci Rep UK 7:11259, 2017). This term refers to the ability of the visual system to perceive several units moving in the same direction, as one coherently moving global unit. Coherent motion perception is commonly investigated using random dot displays, containing variable proportions of coherently moving dots. Here, we investigated the relative contribution of local and global integration mechanisms for coherent motion perception, and changes in detection thresholds as a result of repeated exposure to the experimental stimuli. Dogs who had been involved in the previous study were given a conditioned discrimination task, in which we systematically manipulated dot density and duration and, eventually, re-assessed our subjects’ threshold after extensive exposure to the stimuli. Decreasing dot duration impacted on dogs’ accuracy in detecting coherent motion only at very low duration values, revealing the efficacy of local integration mechanisms. Density impacted on dogs’ accuracy in a linear fashion, indicating less efficient global integration. There was limited evidence of improvement in the re-assessment but, with an average threshold at re-assessment of 29%, dogs’ ability to detect coherent motion remains much poorer than that of humans.     

The roles of different executive functioning skills in young children’s mental computation and applied mathematical problem-solving

This study investigated the relationships of four executive functioning skills (including verbal working memory, spatial working memory, inhibitory control, and cognitive flexibility) with young children’s mental computation and applied mathematical problem-solving. Two hundred and twenty-five Chinese kindergarteners were tested with a battery of general cognitive, executive functioning and mathematics skills. Results showed that when children’s age, gender, non-verbal intelligence, and listening comprehension skills were controlled, verbal working memory and cognitive flexibility were significant correlates of mental computation, whereas verbal working memory, spatial working memory, and cognitive flexibility were significant correlates of applied mathematical problem-solving. Inhibitory control was not significantly associated with the two domains of mathematics under investigation. The findings highlight the differential roles of different executive functioning skills in early mathematical skills and offer practical implication for helping young children in learning complex mathematical skills.     

What makes us believe a conditional? The roles of covariation and causality

Two experiments were conducted to investigate the roles of covariation and of causality in people's readiness to believe a conditional. The experiments used a probabilistic truth-table task (Oberauer & Wilhelm, 2003 Oberauer, K. and Wilhelm, O. 2003. The meaning(s) of conditionals: Conditional probabilities, mental models, and personal utilities. Journal of Experimental Psychology: Learning, Memory & Cognition, 29: 680–693. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar]) in which people estimated the probability of a conditional given information about the frequency distribution of truth-table cases. For one group of people, belief in the conditional was determined by the conditional probability of the consequent, given the antecedent, whereas for another group it depended on the probability of the conjunction of antecedent and consequent. There was little evidence that covariation, expressed as the probabilistic contrast or as the pCI rule (White, 2003 White, P. A. 2003. Making causal judgements from the proportion of confirming instances: The pCI rule. Journal of Experimental Psychology: Learning, Memory, and Cognition, 29: 710–727.  [Google Scholar]), influences belief in the conditional. The explicit presence of a causal link between antecedent and consequent in a context story had a weak positive effect on belief in a conditional when the frequency distribution of relevant cases was held constant.     

Influence of Cd and Ge on the kinetics of Guinier–Preston zone formation in Cu–Be alloys

The influence of Cd and Ge on the kinetics of Guinier–Preston zone formation has been studied for Cu–2?wt%?Be–0.3?wt%?Cd and Cu–2?wt% Be–0.3wt%?Ge solid solutions. The relative volume fractions of these Guinier–Preston (GP) zones are determined for different times of ageing at 473?K by a method based on microhardness measurements. Cd atoms in Cu–Be–Cd accelerate GP zone formation. This is due to the supersaturation of Cd atoms in Cu and their strong binding energy with vacancies. In contrast, the Ge atoms do not influence GP zone formation in Cu–Be–Ge. The binding energies between the two solute atoms and a vacancy, and the concentration of the quenched-in vacancies bound to the solute atoms, are calculated using the Hasiguti formula and the Kimura equation.