Re-precipitation of coherent γ-Fe particles following annealing of equal-channel angular pressed Cu–Fe alloy

The transformation of second-phase particles in a Cu–Fe alloy following equal-channel angular extrusion and annealing has been determined by transmission electron microscopy. Equal-channel angular pressing of the Cu–Fe alloy transformed coherent γ-Fe particles in the Cu matrix into incoherent α-Fe. Upon annealing, numerous coherent γ-Fe particles were observed. A dislocation–particle interaction mechanism is suggested to explain the re-precipitation of coherent γ-Fe particles following annealing.     

Microstructure and mechanical properties of Mg–8Al alloy fabricated by room-temperature multi-directional forging

As-extruded Mg–Al alloy was multi-directionally forged (MDFed) at room temperature to cumulative strain of ΣΔ??=?2.0 at maximum by employing a pass strain of Δ??=?0.1. The coarse initial grains were subdivided gradually to ultra-fine ones by mechanical twinning. The MDFed Mg alloy showed superior mechanical properties of 530?MPa yield and 650?MPa ultimate tensile strengths with ductility of 9%. The relatively large ductility was induced by grain orientation randomization due to multiple twinning and the small pass strains which suppressed the sharp basal-texture evolution.     

High-resolution characterization of the precipitation behavior of an Al–Zn–Mg–Cu alloy

The metastable particles in an Al–Zn–Mg–Cu alloy have been examined at atomic-resolution using high-angle annular dark field (HAADF) imaging. In under-aged conditions, thin η′ plates were formed with a thickness of seven atomic planes parallel to the {111}_Al planes. The five inner planes of the η′ phase appear to be alternatively enriched in Mg and Zn, with two outer planes forming distinct Zn-rich interfacial planes. Similar Zn-rich interfacial enrichment has also been identified for the η phase, which is a minimum 11-plane thick structure. In rare instances, particles less than seven planes were found indicating a very early preference for seven-layer particle formation. Throughout the aging, the plate thickness appears constant, while the plate radius increases and no particles between 7 and 11 planes were observed. Based on the HAADF contrast, our observations do not support the η′ models previously set forth by other authors. Clear structural similarities between η′ and η were observed, suggesting that drawing distinctions between η′ and η phases may not be necessary or useful.     

Deformation structure after fracture-toughness test of Mg–Al–Zn alloys processed by equal-channel-angular extrusion

Fracture toughness and deformation structures have been investigated using an AZ31 magnesium alloy processed by equal-channel-angular extrusion (ECAE). The ECAE-processed alloy (as-ECAE) was annealed at 573?K for 24?h (annealed-ECAE). The average grain sizes of as-ECAE and annealed-ECAE alloys were 4.0 and 16.3?µm, respectively. The plane-strain fracture toughness K _IC, obtained by stretched-zone analysis in as-ECAE and annealed-ECAE, were estimated to be 27.3 and 23.5?MPa/m^1/2, respectively. From optical microstructural observations in samples after the fracture-toughness tests, deformation twins were observed in annealed-ECAE. No deformation twins were observed in as-ECAE. In addition, dislocations on basal planes, as well as on non-basal planes, were activated in as-ECAE. It is concluded that the enhancement of the fracture toughness in the fine-grain structure was related to a reduction of deformation twins and dislocation movement in non-basal planes.     

Research on parking choice behavior of shared autonomous vehicle services by measuring users’ intention of usage

Shared autonomous vehicles (SAVs) are one of the important development directions of smart and green transportation. However, relevant researches are not sufficient at present. The factors influencing the intention to use SAVs and their parking choice behaviors need to be further analyzed. First, in order to better explain, predict, and improve travelers’ intention to use SAVs, the conceptual framework based on technology acceptance model was developed to establish the relationships between the travelers’ intention to use SAVs, social influence of SAVs, attitude toward behavior of SAVs, perceived risk of SAVs, perceived usefulness of SAVs and perceived ease of these use. Then structural equation model (SEM) was established to analyze the relationship between various variables. The results show that the perceived usefulness, behavior attitude, social influence, perceived ease of use, and perceived risk are the main factors that determine the intention to use SAVs. Through the test of direct effect, indirect effect, and total effect in the model, it is found that perceived usefulness has the largest total impact on intention to use SAVs, with a standardized coefficient of 0.765, followed by behavior attitude (0.732), social influence (0.597), perceived ease of use (0.462) and perceived risk of SAVs (−0.452). In addition, through the study of observed indicator variables ATB2 and BI3, it is found that perceived usefulness, perceived ease of use, social influence, perceived risk, attitude toward behavior, and behavior intention all have an impact on parking behavior. In order to study the specific influencing factors of parking choice behavior, a multinomial logit (MNL) model was established to analyze the relationships between travelers’ parking choice behaviors and the influential factors, which include travelers’ individual characteristics, travel attributes, and parking modes’ attributes by extracting from a questionnaire. The results show that the travel time, travel fees, parking charge, cruising fees, parking time and traffic emission are the main factors that determine travelers’ choices of parking. This paper provides advice for operators of SAVs.     

Are employees' ratings of coworkers' organizational citizenship behavior influenced by their own perceptions of organizational justice?'

Partial correlation analysis of questionnaire data from 62 of 65 employees of a Turkish company indicated that employees' own perceptions of organizational justice in terms of distributive, procedural, and interactional justice were related to how they rated their coworkers' organizational citizenship behavior. Specifically, all three two-way interactions between the justice variables were related to organizational citizenship behavior.     

Acquisition and retention of control of instrumental behavior by a cue-signaling airblast: How specific are conditioned anticipations?

The conditioned state evoked by a CS that had been paired with an aversive airblast was assessed by superimposing the CS on baselines of instrumental responding. The first experiment used a shock avoidance baseline; CS-airblast pairings were administered on the baseline, with the shock avoidance schedule in effect. The CS that signaled airblast came, over trails, to accelerate shock avoidance responding. As further CS-airblast trials were administered, however, the acceleratory effect of the CS decreased, producing an inverted-U-shaped acquisition curve. A second experiment used off-baseline CS-airblast conditioning, and the CS was tested on both shock avoidance and water reinforcement baselines. After 20 CS-airblast pairings the CS accelerated shock avoidance and suppressed water-reinforced responding. After 10o pairings, however, the acceleratory effect on shock avoidance was much attenuated, although the suppressions of the water-reinforced behavior did not differ between 20- and 100-trial groups. Two further experiments examined retention, over a 45-day interval, of the attenuation of the CS's effects on shock avoidance. Over the retention interval, this attenuation disappeared. It was, however, reinstated by giving the animals “reminder” presentations of the airblast. These results are interpreted as representing systematic changes in the specificity of the conditioned state evoked by a Pavlovian CS.     

Nanostructure and related mechanical properties of an Al–Mg–Si alloy processed by severe plastic deformation

Microstructural features and mechanical properties of an Al–Mg–Si alloy processed by high-pressure torsion (HPT) have been investigated using transmission electron microscopy, X-ray diffraction, three-dimensional atom probe, tensile tests and micro-hardness measurements. It is shown that HPT processing of the Al–Mg–Si alloy leads to a much stronger grain size refinement than of pure aluminium (down to 100 nm). Moreover, massive segregation of alloying elements along grain boundaries is observed. This nanostructure exhibits a yield stress even two times higher than that after a standard T6 heat treatment of the coarse-grained alloy.     

Is self disclosure by a physically handicapped proband reciprocated by the interaction partner? An experimental study of the effect of physical handicap on interaction behavior with non-handicapped interaction partners

An experimental study tested whether an able-bodied person's positive disposition toward a disabled interaction partner was effective in the amount of reciprocation given to the disabled partner's self-disclosure. Sixty female subjects were confronted with either a disabled or nondisabled conversation partner who showed either a high or a low amount of self-disclosure. We anticipated that a "sympathy" effect of disablement in the amount of the subjects' self-disclosure would result from the nondisabled partner's overcompensation. This arises from an effort to compensate the negative, stereotyped attitudes to the disabled in actual behavior toward a single, disabled person by more strongly reciprocating the self-disclosure of a disabled interaction partner compared to a nondisabled one. Results showed that, contrary to expectations, self-disclosure was equally reciprocated with both a disabled and a nondisabled partner. However, a "sympathy" effect was found in the impression judgments on the disabled partner who had shown a high amount of self-disclosure in the previous conversation. The lack of a "sympathy" effect in the amount of self-disclosure was possibly the result of (1) the reciprocation of self-disclosure not being exclusively determined by intentional control processes; and/or (2) the evaluative significance of the amount of self-disclosure not being clear to the subjects in the interaction studied. It is concluded that the efforts of the nondisabled to show an unprejudiced attitude toward a disabled interaction partner are mostly effective in other aspects of behavior than the amount of self-disclosure.     

What motivates deviant behavior in the workplace? An examination of the mechanisms by which procedural injustice affects deviance

This research examines the motivational and social-cognitive processes underlying the procedural injustice and deviance relationship. Based on psychological need and self-determination theories, it was hypothesized that intrinsic motivation would mediate the relationship between procedural injustice and deviance. Based on the general aggression model and social-cognitive theory, it was hypothesized that this positive indirect effect would be moderated by dispositional aggression. Two studies were conducted, including multi-wave and multi-source data, to test these relationships through mediation and moderated mediation procedures. Results supported both hypotheses: intrinsic motivation mediated the procedural injustice and deviance relationship; and this positive indirect effect was moderated by dispositional aggression, such that higher levels of aggression increased the magnitude of the indirect effect. Results were consistent across multiple measures of intrinsic motivation, aggression, and deviance (self- and other-report). Theoretical and practical contributions include support for a process-based theory of deviant behavior in the workplace and organizational interventions aimed at enriching one’s job to develop greater feelings of intrinsic motivation.     

‘Fighting’ for survival: A systematic review of physically violent behavior perpetrated and experienced by homeless young people

ObjectivesThis systematic review appraises published studies reporting associations between homelessness, perpetration of physically violent behavior and experience of victimization due to others' physically violent behavior, among young people.MethodsA comprehensive systematic search of psychology, sociology, and health electronic databases, including PsycInfo and SocIndex was conducted. Search terms examined (a) homeless youth, (b) perpetration of physically violent behavior, and (c) experience of victimization due to others' physically violent behavior.ResultsTwenty-nine studies met the inclusion criteria. Findings showed homeless youth report engaging in physically violent behavior including assault, physical fights, and robbery, and commonly describe victimization experiences such as being physically assaulted, threatened with weapons, and robbed. Rates of perpetration of physically violent behavior and experiences of victimization were inconsistent across reviewed studies. It is unclear whether homelessness is a predictor of the perpetration of physically violent behavior and/or victimization. Findings suggest that perpetration of, and being victimized by others' physically violent behavior, may vary for sub-groups of homeless youth.ConclusionsFurther research embedded within theoretical perspectives that consider the influence of situational antecedents is warranted to examine whether homelessness is predictive of engagement in physically violent behavior and the experience of victimization due to others' physically violent behavior.     

A developmental-genetic analysis of aggressive behavior in mice (Mus musculus): III. Behavioral mediation by heightened reactivity or immobility?

This research was designed to investigate development and behavioral mediation in lines of ICR mice that have been selectively bred for aggressive behavior. General behavioral reactivity and behavioral immobility have been implicated as potential mediators by prior analyses of preattack interactions. To evaluate the separate roles of these dispositions, the emergence of attacks in genetically selected lines was tracked for 11 years by three levels of analysis: over successive generations, over development, and over dyadic interactions. Convergent outcomes were observed in all three levels with respect to two findings: (a) Robust line differences were obtained in attack behaviors, and (b) strong associations were found between line differences in attacks and line differences in behavioral immobility. Conversely, all three levels of analysis indicated a weak and inconsistent association between line differences in attacks and measures of social and nonsocial reactivity.