Formation of decagonal and approximant phases in the Al-Ni-Ru system

Al-Ni-Ru alloys with a wide composition range have been synthesized and examined by X-ray and electron diffraction experiments. In this system, two types of decagonal (d) phases are formed, namely basic-type and superlattice-type d phases. Annealing experiments have shown that the basic-type d phase is stable at high temperatures and that its single-phase region is located in a small composition range around Al 75 Ni 15 Ru 10 . On the other hand, the superlattice-type d phase is metastable and has been found to form only in the samples before annealing. Besides the d phases, a high-order crystal approximant phase with lattice parameters a = 99.5 Å and b = 84.6 Å has been found. The structural relation between the approximant phase and the d phase is discussed in terms of a phason tensor.     

Contextual control of negative transfer produced by prior CS-US pairings

When a conditioned stimulus (CS) is repeatedly paired with a weak unconditioned stimulus (US) prior to being paired with a stronger US in a second conditioning phase, interference, or negative transfer, is often observed during Phase 2. Two conditioned suppression experiments with rat subjects examined the effect of a context switch between phases in this “Hall-Pearce negative transfer paradigm.” In Experiment 1, negative transfer was obtained when the context remained the same for both phases, but there was no evidence of negative transfer when the context was switched between phases. Experiment 2 was designed to control for familiarity with the Phase 2 context, and showed that a context switch between phases again attenuated negative transfer. The effect of context on negative transfer was also similar to its effect on latent inhibition produced under comparable conditions. The results are not consistent with a model proposed by J. M. Pearce and G. Hall (Psychological Review, 87, 532–555, 1980), which ascribes no major role to the context in this situation, but are consistent with A. R. Wagner's (In S. H. Hulse, H. Fowler, & W. K. Honig, Eds., Cognitive Processes in Animal Behavior, pp. 177–209. Hillsdale NJ: Erlbaum, 1978) short-term memory model of conditioning, or with the view that contexts may signal specific CS-US relations. The results extend previous research on other interference paradigms, like latent inhibition and extinction, where context may play a similar role.     

Learning as a possible sign of non-reflective consciousness in persons with a diagnosis of vegetative state and pervasive motor impairment

A diagnosis of vegetative state represents a serious predicament, which basically precludes/minimizes rehabilitation perspectives. Reliability of the assessment approach in these situations is of paramount importance, but not easy to achieve. In recent studies, a learning assessment procedure has been suggested as a supplement in the diagnostic process and assessed with eight patients. The procedure involves an ABABCB sequence in which A represents baseline phases with no stimulation available, B intervention phases with stimuli delivered contingently on target responses, and C a control condition. This condition involves stimulation presented non-contingently. The patients’ ability to associate responding with environmental stimuli and thus increase such responding during the B phases, and reduce it during the A and C phases, may be considered a sign of learning. Learning might be viewed as representative of forms of concrete knowledge and presumably basic levels of consciousness. Preliminary results indicate that (a) signs of learning may appear in patients with a previous diagnosis of vegetative state and (b) the presence of those signs may require a revision of their diagnostic label and a reappraisal of their rehabilitation perspectives.     

Adaptation of Neuromuscular Synergies During Intentional Constraints of Space-Time Relationships in Human Gait

Tight frequency-to-amplitude relationships are observed in spontaneous human steady gait. They can be modified, if required; that flexibility forms a fundamental basis of the intentional adaptive capabilities of locomotion. In the present experiments, the processes underlying that flexibility were investigated at both the level of joint kinematics and the level of neuromuscular synergies. Subjects (N = 4) walked at the same speed either with a preferred or a nonpreferred frequency-to-amplitude relationship (i.e., constrained, short steps at a high frequency [COS condition] or constrained, long steps at a low frequency [COL condition]); their swing and stance phases were separately analyzed. In the COS condition, increases in EMG activity were specifically required during the swing phase. In the COL condition, several muscles required increases in EMG activity during the stance phase, but decreases of the hamstring muscles were needed during the swing phase. Whereas, in preferred walking, modification of the frequency affects the EMG patterns globally (the gain increasing with the frequency in both the stance and swing phases), the present results show that changing the frequency in a constrained manner either affects the swing phase specifically or affects both phases, but in the opposite direction. That finding indicates mat a separate control is needed in both the swing and the stance phases.     

Study on the damping behaviour of eutectic high-entropy alloys with lamellar structures

ABSTRACT

Damping is the ability to reduce the energy produced by vibrations in a system. In this research, the eutectic high-entropy alloys (EHEAs), AlCo_xCrFeNi_2.1 (x?=?0.7, 1.0 and 1.5), are firstly studied for their damping behaviour. EHEA is a promising concept of high-entropy alloys. By combining the advantages of eutectic phases and HEAs, the EHEAs show better liquidity, castability and compositional homogeneity than conventional HEAs. Meanwhile, it can strike a great balance in mechanical strength and tensile ductility owing to the lamellar structures. The microstructures and crystal structure of two near-EHEAs are also studied. AlCo_0.7CrFeNi_2.1 is a hypo-eutectic HEA with primary body-centred cubic phases. AlCo_1.5CrFeNi_2.1 is a hyper-eutectic HEA with primary face-centred cubic phases. The results showed that these eutectic and near-eutectic alloys gave rise to greater tan δ values than conventional dual-phase HEAs, which might be attributed to their lamellar structures.     

Motion analysis of dyadic talk during joint search and decision-making – A replication study

Human interaction frequently includes decision-making processes during which interactants call on verbal and non-verbal resources to manage the flow of interaction. In 2017, Stevanovic et al. carried out pioneering work, analyzing the unfolding of moment-by-moment dynamics by investigating the behavioral matching during search and decision-making phases. By studying the similarities in the participant's body sway during a conversation task in Finnish, the authors showed higher behavioral matching during decision phases than during search phases. The purpose of this research was to investigate the whole-body sway and its coordination during joint search and decision-making phases as a replication of the study by Stevanovic et al. (2017) but based on a German population. Overall, 12 dyads participated in this study and were asked to decide on 8 adjectives, starting with a pre-defined letter, to describe a fictional character. During this joint-decision task (duration: 206.46 ± 116.08 s), body sway of both interactants was measured using a 3D motion capture system and center of mass (COM) accelerations were computed. Matching of body sway was calculated using a windowed cross correlation (WCC) of the COM accelerations. A total of 101 search and 101 decision phases were identified for the 12 dyads. Significant higher COM accelerations (5.4*10⁻³ vs. 3.7*10⁻³ mm/s², p < 0.001) and WCC coefficients (0.47 vs. 0.45, p = 0.043) were found during decision-making phases than during search phases. The results suggest that body sway is one of the resources humans use to communicate the arrival at a joint decision. These findings contribute to a better understanding of interpersonal coordination from a human movement science perspective.     

Alleviating Choking: The Sounds of Distraction

“Choking” is defined as a critical deterioration in the execution of habitual processes as a result of an elevation in anxiety levels under perceived pressure, leading to substandard performance. In the current study, music was used in a “dual-task” paradigm to facilitate performance under pressure. Three “choking-susceptible” experienced female basketball players were purposively sampled from 41 screened players. Participants completed 240 basketball free throws in a single-case A₁-B₁-A₂-B₂ design (A phases = “low-pressure” and B phases = “high-pressure”), with the music intervention occurring during the B₂ phase. Following completion of the phases, an interview was conducted to examine perceptions of choking and cognitions associated with the effects of the music lyrics. Participants improved performance in the B₂ phase, and explained that choking resulted from an increase in public self-awareness (S-A). The music intervention decreased S-A, and enabled participants to minimize explicit monitoring of execution and reduce general distractibility.     

ACCURACY OF SELF-ASSESSMENT OF ON-TASK BEHAVIOR BY ELEMENTARY SCHOOL CHILDREN1

Being able to assess one's own performance would seem to be prerequisite to most forms of self-management. The present study investigated the extent to which children in a typical second-grade classroom could accurately assess their own academic on-task behavior. In essence, this investigation replicated an experiment by Glynn and Thomas (Journal of Applied Behavior Analysis, 1974, 7 , 299–306) and extended those findings, by studying self-assessment over a longer span of time. The 31 children in the class ranged in age from 7 yr five months to 8 yr six months. Although only eight “problem” children were observed and studied, the self-control treatment procedures were applied to all children in the class. Behavior was observed daily during mathematics lessons for over eight school weeks. The study utilized a five-phase ABABC design, where the A phases were baseline periods, B phases were self-control periods, and C phase was a postcheck. In the self-control phases, children were asked by the teacher to put a check on their own individual performance card if they were on-task when a signal sounded. If they were not on-task, they were instructed not to touch their card. Typically, 15 to 20 signals occurred per 40-min session. At the end of the lesson, children were allowed to choose games to play according to how many checks they had earned. During all experimental phases, observers measured children's on-task behavior. Other observers measured the children's accuracy of self-assessment in the self-control phases. The results showed noticeable increases in the daily mean on-task behavior scores in the self-control phases following baseline phases. Also, a high level of on-task behavior was maintained in the postcheck phase. The variances of on-task behavior scores during the self-control phases were noticeably smaller than those in the baseline phases. Generally, individual data reflected group results, with some minor differences. Levels of accuracy of self-assessment varied from very accurate (95% of the time) to relatively inaccurate (56% of the time). The overall level of accuracy for all children was 78%. No consistent individual pattern appeared across phases. Some children got better as the study proceeded and some got worse. Most subjects tended to give themselves too much reinforcement, rather than too little. Peer social surveillance appeared to be the major factor that influenced individuals' evaluation of their own behavior, even though the teacher did make some control remarks in regard to how the children marked their cards. The results also demonstrated that self-control techniques can increase on-task behavior in a classroom with no history of external reinforcement, and that these techniques can have a lasting effect for more than two months of a school year.     

Burnout and psychiatric “cases”: Early evidences of an association

This exploratory study extends the phase model of burnout in a critical direction by assessing whether individuals assigned to eight progressive phases will present escalating mental health symptoms. Despite the small convenience population (N = 161), the present affirmative results encourage early replications for three basic reasons. Thus the associations with mental health reported here are consistent with numerous other tests of the concurrent validity of the phase model. Moreover, substantial proportions of the variance are explained here by data supporting the view that the progressive phases are associated with accelerating proportions of “cases,” here defined as respondents to the General Health Questionnaire (GHQ) who report four or more non-psychotic psychiatric symptoms. The GHQ form used here is modified for U.S. contexts. In addition, this basic conclusion is reinforced in three ways: by factor analysis of GHQ items; by rejecting several variables alternative to the phases as GHQ variants; and by using canonical discriminant functions to compare phase assignments with the actual group memberships of “normals” and “cases” assigned by the GHQ.     

Hegel and self‐actualization

Abstract

Hegel says that mind develops through three phases, which he calls soul, consciousness, and mind. By referring to these three phases as the Primary level, the Social level and the Realizing level, it makes it clearer that they link up with thoroughly familiar phenomena in the field of psychotherapy and with contemporary life generally. In fact, they give a new angle on the whole process of self‐actualization, which throws light on many topics in humanistic psychology.     

Adaptation of neuromuscular synergies during intentional constraints of space-time relationships in human gait

Tight frequency-to-amplitude relationships are observed in spontaneous human steady gait. They can be modified, if required; that flexibility forms a fundamental basis of the intentional adaptive capabilities of locomotion. In the present experiments, the processes underlying that flexibility were investigated at both the level of joint kinematics and the level of neuromuscular synergies. Subjects (N = 4) walked at the same speed either with a preferred or a nonpreferred frequency-to-amplitude relationship (i.e., constrained, short steps at a high frequency [COS condition] or constrained, long steps at a low frequency [COL condition]); their swing and stance phases were separately analyzed. In the COS condition, increases in EMG activity were specifically required during the swing phase. In the COL condition, several muscles required increases in EMG activity during the stance phase, but decreases of the hamstring muscles were needed during the swing phase. Whereas, in preferred walking, modification of the frequency affects the EMG patterns globally (the gain increasing with the frequency in both the stance and swing phases), the present results show that changing the frequency in a constrained manner either affects the swing phase specifically or affects both phases, but in the opposite direction. That finding indicates that a separate control is needed in both the swing and the stance phases.     

Stimulus contributions to operant resurgence

In two experiments, pigeons were exposed to a three‐phase resurgence procedure (train Response A; extinguish Response A and train Response B; extinguish Response B). In the first experiment, the stimuli associated with phases were different, resulting in a resurgence procedure combined with an ABC renewal procedure. Presenting the novel stimulus, C, during extinction of both responses in the third phase resulted in minimal resurgence. Subsequently, substituting the original training Stimulus A for Stimulus C resulted in resurgence with all pigeons. In the second experiment, resurgence with the same stimuli present in all three phases of the resurgence procedure (AAA) was compared concurrently with a resurgence procedure in which the ABC renewal procedure used in Experiment 1 was superimposed. Substantially more resurgence occurred with the AAA procedure compared to the ABC procedure. Although ABC renewal in combination with the resurgence procedure generated some resurgence, such recurrent responding was attenuated relative to that observed when the stimulus conditions were constant across phases. Combined with earlier research showing the enhancing effects of combining resurgence and ABA renewal procedures, the present results elaborate on how stimuli correlated with certain behavioral histories affect the course of operant resurgence.     

Observed increases in positive affect during behavioral treatment

A 15‐year‐old female diagnosed with mental retardation was admitted to an inpatient facility for the assessment and treatment of a severe behavior disorder. A behavioral treatment to reduce destructive behavior consisting of enriched environment, differential reinforcement, and time‐out was evaluated in a reversal design. Data on affect were collected during baseline and treatment phases. In addition to achieving clinically significant reductions in problem behavior, collateral improvements in positive affect were observed during treatment phases. Copyright © 2003 John Wiley & Sons, Ltd.     

Distinct eye movements for different cognitive processes as expressed in the face recognition task

Contemporary research literature indicates that eye movements during the learning and testing phases can predict and affect future recognition processes. Nevertheless, only partial information exists regarding eye movements in the various components of recognition processes: Hits, Correct rejections, Misses and False Alarms (FA). In an attempt to address this issue, participants in this study viewed human faces in a yes/no recognition memory paradigm. They were divided into two groups – one group that carried out the testing phase immediately after the learning phase (n?=?30) and another group with a 15-minute delay between phases (n?=?28). The results showed that the Immediate group had a lower FA rate than the Delay group, and that no Hit rate differences were observed between the two groups. Eye movements differed between the recognition processes in the learning and the testing phases, and this pattern interacted with the group type. Hence, eye movement measures seem to track memory accuracy during both learning and testing phases and this pattern also interacts with the length of delay between learning and testing. This pattern of results suggests that eye movements are indicative of present and future recognition processes.     

Counselling asylum seekers and refugees: a study of Kurds in early and later stages of exile

This study explores the experience of asylum seekers and refugees in early and later phases of exile. Twenty-five Kurds (mainly asylum seekers) were interviewed in Greece in early phases of exile and twenty Kurds (mainly refugees) in later phases of exile in the UK. Refugee camps in Greece and community centres in London were the main locations for these interviews. Representatives from eight support organizations were also interviewed in each country. The multidimensional aspects of being a refugee are discussed, including models of formulating the experience, PTSD and the cross-cultural context. Key findings of the study include the desperate need among the asylum seekers and refugees, in the early phases, to have the story of their traumatic journey to Greece witnessed and validated by an outsider; the differing experiences of men and women; a change in identity over time; and considerable fear, which was evident in early and later phases. Moreover, all the support organizations expressed pronounced frustration but responded to it in different ways. Those organizations with supervision and support groups in place demonstrated more insight into their interactions with asylum seekers and refugees. Counselling approaches are evaluated with reference to the asylum seekers' and refugees' needs, and the desirability of adequate support for those with a counselling role is highlighted.     

Synthesis,transformation and superconductivity of dual phase In–Sn alloy nanoparticles embedded in an Al matrix

We report the synthesis of nanoembedded biphasic alloy particles of In–Sn near eutectic alloy compositions embedded in an aluminium matrix by rapid solidification processing. Detailed transmission electron microscopy indicates that the two phases present at room temperature in as-synthesized samples are β and γ phases with tetragonal and hexagonal crystal structures, respectively. These co-exist with a small amount of single phase In or Sn particles with sizes less than 10?nm. Low temperature magnetization measurements indicate a superconducting transition temperature of 5?K, suggesting complete decomposition of the β-phase at small sizes and at low temperature. The small particles show type II behavior with a critical field Hc₁≈44?G and two values for Hc₂ of 250 and 1000?G, respectively. These values are considerably lower than those observed in bulk In–Sn alloys.     

The repetition effect in judgments of temporal duration across minutes, days, and months.

Three experiments assessed the stability of the repetition effect in time judgment. In Experiment 1, subjects (N = 18) produced intervals ranging from 8 to 31 sec in a two-phase procedure with a five min rest between phases. In Experiment 2, subjects (N = 20) made verbal estimates of intervals ranging from 8 to 20 sec with a 48-hour delay between phases. Experiment 3 involved daily productions by three subjects of intervals ranging from 8 to 54 sec over several months. The slope of the psychophysical function increased across phases in Experimental 1, declined (as expected for estimation) across days in Experiment 2, and increased across months in Experiment 3. It was concluded that the repetition effect is relatively permanent and thus more similar to habituation than to sensory adaptation.     

Thermodynamic criterion for the formation of Laves phases in binary transition-metal systems

A thermodynamic factor k is proposed to combine the deviation of atomic size ratio from the ideal value of 1.225 and the formation enthalpy, for the formation of Laves phases in binary transition-metal systems. Based on calculations for some 132 Laves phases, the conditions favouring the formation of the Laves phases are that k be greater than a critical value of 310 and formation enthalpy be larger than ?130 kJ mol^?1. The calculated results are statistically in agreement with experimental observations reported so far in the literature.     

Using group therapy to foster the psychosexual development of patients with eating disorders

When eating-disordered patients participate in long-term eating-dis-order groups, they move through phases of group development that parallel phases of psychosexual development. In the trust (oral) phase, members have an opportunity to experience a positive symbiosis, a suitable holding environment, and optimal frustration. In the control (anal) phase, members learn to identify and express anger constructively. In the intimacy (oedipal) phase, members learn to compete and be intimate. Individual and group movement is facilitated by the group leader being able to identify stages of group development and being able to utilize phase-related techniques.Many thanks to Anne Alonso, Ph.D., Robert Dies, Ph.D., and Geraldine Alpert, Ph.D., for their critiques of the first draft of this paper.     

The self in transformation: Dialectical processes in long-term psychotherapy

A number of phases are notable during the process of integration of the self through psychotherapy. Each of these phases encompasses a particular ontology in relation to the dynamic self. The underlying process of change, moreover, may be conceived of as dialectical in nature with each phase having a unique thesis and antithesis. A clinical case is presented to illustrate these ideas for the therapist.