Interfacial waves between two magneto-electro-elastic half-spaces with magneto-electro-mechanical imperfect interface

The propagation of shear horizontal waves between the interface of two magneto-electro-elastic materials with an magneto-electro-mechanical imperfect contact has been studied. Mechanical, electrical and magnetical imperfections are modelled by means of a spring, a capacitor and an inductor, respectively. A general expression for the dispersion relation is given in an explicit form. Some limit cases are analysed in detail. The influence of imperfect contacts is shown in some numerical results.     

Interfacial waves between two piezoelectric half-spaces with electro-mechanical imperfect interface

We study the propagation of shear horizontal waves between the interface of two piezoelectric materials with an electro-mechanical imperfect contact. Mechanical and electrical imperfections are modeled by means of a spring and a capacitor, respectively. The corresponding mathematical expressions for the imperfect contact are given in this article. The system of differential equations for the waves in the considered half-space is derived and the associate solutions are found. A general expression for the dispersion relation, not reported previously in the literature, is given in an explicit form, with the diverse limit cases analyzed in detail. In some of these limit cases, new expressions are also obtained, which predict the existence of interfacial waves. In the other cases, where already reported results exist, a comparison with them is done. Some physical interpretations are derived from the limit cases. The influence of mechanical and electrical imperfect contacts are shown in some numerical examples.     

Scaling law for the low-frequency a.c. conductivity of fluid-saturated porous media

Abstract

An empirical scaling law for the real part of the frequency-dependent electrical conductivitσ′(ω) of brine-saturated porous materials in relation to its d.c. limit has been identified. This scaling law relates the conductivity as a function of frequency, porosity and salinity to a function of only one variable that is the ratio of the frequency to the d.c. conductivity in appropriate units. This result is very similar to what has been reported in hopping semiconducting systems.     

Shear horizontal surface waves in piezoelectric materials with surface stress

ABSTRACT

The propagation of shear horizontal (SH) surface waves in piezoelectric semi-infinite bodies is investigated theoretically. The surface stress exerting on the boundary is taken into account through surface piezoelectricity theory, and the velocity ranges and existence conditions of such surface waves for both electrically open and shorted cases are derived in detail. Analysis results show that the SH surface waves occurring with surface stress are dispersive in contrast to the classical situation, and the propagation characteristics strongly depend on the relative value of surface elasticity, surface piezoelectricity and surface density.     

“Eddie would(n't) go!” perceptual-cognitive expertise in surfing

ObjectivesThe goal of the present research was to investigate the decision making skills of surfers as a function of surfing experience.DesignWe used a between-subject quasi-experimental design.MethodParticipants (N = 76) with different levels of surfing expertise were asked to indicate via a button press which waves they would try to catch in a computer-based video decision-making task that presented videos of approaching waves.ResultsThe quality of participants' decisions corresponded in a linear manner with the amount of surfing experience, i.e. the more experience a surfer had, the better they were able to decide which waves were surfable and which waves were not. Specifically, more experienced surfers were superior at deciding which waves not to surf.ConclusionsWe provided first evidence that highly experienced surfers possess a cognitive advantage compared to less experienced surfers or a non-surfing control group by being better able to distinguish between surfable and non surfable waves. The results are discussed within the expert performance approach as being supportive of the notion that surfing experience led to perceptual-cognitive adaptations that allow surfers to pick the right waves.     

Are Our Concepts conscious state and conscious creature Vague?

Intuitively it has seemed to many that our concepts conscious state and conscious creature are sharp rather than vague, that they can have no borderline cases. On the other hand, many who take conscious states to be identical to, or realized by, complex physical states are committed to the vagueness of those concepts. In the paper I argue that conscious state and conscious creature are sharp by presenting four necessary conditions for conceiving borderline cases in general, and showing that some of those conditions cannot be met with conscious state. I conclude that conscious state is sharp, and the conclusion is then extended to conscious creature. The paper ends with a brief discussion of some implications.

Radiation damage in TiOx at high current density

Abstract

Observations of beam damage under high-current-density irradiation in three forms of titanium oxide are presented. The three forms: TiO₂, Ti₂O₃ and TiO, have widely differing electrical conductivities but all appear to be damaged by the same mechanisms. The results are discussed in terms of a previously reported model which suggested that only ionic insulators should be susceptible to this type of damage.     

Attitudes toward health-messages: The link between perceived attention and subjective strength

IntroductionMany efforts are invested in promoting healthy attitudes and behaviors; nonetheless there is no clear, definitive evidence of sustained effectiveness of those efforts in all cases.ObjectiveThe present study examined the role of perceived attention in changing attitudes toward vegetable consumption as well as the perceived stability and resistance of those changes (attitude strength).MethodParticipants were randomly assigned to read a strong or weak health communication arguing in favor of vegetable consumption. After reading the message, participants reported attitudes toward this health issue, the perceived attention, and the perceived strength associated with their evaluations.ResultsParticipants who reported high (vs. low) perceived attention showed a greater effect of argument quality on persuasion. Furthermore, such participants also reported stronger attitudes compared to those who reported low perceived attention.ConclusionThis study showed that attitudes toward vegetable consumption can be changed after reading a persuasive message, and that the extent of perceived attention moderated the extent to which those changes were perceived as stable and resistant (stronger attitudes).     

The Indifference Function

Abstract

Data from 2 studies conducted in the United States—1 with high school students and 1 with college students—are reported. Two-hundred forty-one multiethnic/multiracial youths (also termed biethnic/biracial, mixed ethnic/mixed racial, and interracial) were selected using 2 large surveys and compared with 1,041 of their monoethnic peers. Although more than 10% of the students across both studies were multiethnic, less than one third of these respondents labeled themselves as such. Ethnic self-labels varied with setting, type of question, and parental ethnicity. Multiethnic youths did not differ from monoethnics regarding self-esteem. In some cases, multiethnic students had more positive attitudes toward other groups than moneethnics did.     

A view from the visitors' gallery

SUMMARY

In this paper, the author describes aspects of his work as a psychoanalytical psychotherapist in a hospital for diseases of the colon and rectum. After reviewing some of the earlier psychoanalytic literature (Freud and Abraham), and more recent theoretical contributions, two cases are described in some detail, which help give a flavour to some of the work. The paper concludes with caveats about the internal and external working environment, which will facilitate or hinder working in particular medical settings.     

Sb 2 Te 3 and In 0.2 Sb 1.8 Te 3 : A comparative study of thermoelectric and related properties

Sb 2 Te 3 and its solid solutions with group III elements such as In are materials of current interest for their potential thermoelectric applications. Single crystals of Sb 2 Te 3 and In 0.2 Sb 1.8 Te 3 have been grown by the Bridgman method and their powder X-ray diffractograms obtained and indexed. The transport properties, namely electrical conductivity, Seebeck coefficient and thermal conductivity, as well as the optical bandgap of the alloys have been measured and are compared. The ternary alloy containing In has a smaller optical bandgap and lower electrical and thermal conductivity than Sb 2 Te 3, but a higher Seebeck coefficient.     

Co-occurrence of aggressive behavior and depressive symptoms in early adolescence: A longitudinal multi-informant study

IntroductionAggressive behavior and depressive symptoms co-occur frequently during adolescence. The failure model argues that the onset of aggressive behavior is more likely to precede the onset of depressive symptoms, whereas the acting-out model states that depressed mood predicts subsequent aggressive behavior. However, few longitudinal studies have examined with fully recursive models the temporal ordering of aggressive behavior and depressive symptoms during early adolescence.ObjectiveTherefore, this study examined the bidirectional associations between aggressive behavior and depressive symptoms during early adolescence, using a multi-informant cross-lagged panel model. Gender differences were also investigated.MethodWe used data from three waves of questionnaire data that were annually collected among 497 early adolescents (56.9% boys) and their parents, thereby covering an age range from 12 to 15. Adolescents reported on their depressive symptoms and the parents reported on the adolescents’ aggressive behavior.ResultsCross-lagged path analyses showed that early adolescents’ aggressive behavior predicted subsequent depressive symptoms, but early adolescents’ depressive symptoms did not predict aggressive behavior. Findings were similar for boys and girls.ConclusionThus, our results provide support for the failure model and suggest that reducing aggressive behavior at the start of adolescence might reduce the risk for subsequent depressive symptoms.     

Attitudes toward Women in Northern Ireland

ABSTRACT

Previous research has shown that priming the individual self can increase the accessibility of individual self-cognitions. In turn, we hypothesized that blame for immoral behaviors also would increase, leading to higher assignments of punishment, but that the size of this effect would depend on whether the behaviors violated perfect or imperfect duties. To test these hypotheses, participants assigned yearly bonus penalties to employees who had performed dishonest, disloyal, unfriendly, or uncharitable acts. As expected, the individual prime increased punishments, and this effect was accentuated for violations of perfect duties relative to violations of imperfect duties.     

Blinding integrity of dorsomedial prefrontal intermittent theta burst stimulation in depression

BackgroundThe antidepressant effect of repetitive transcranial magnetic stimulation (rTMS) is partly placebo, making blinding integrity important. Blinding of high-frequency rTMS and intermittent theta burst stimulation (iTBS) has been reported as successful at study end. However, blinding integrity at study start is rarely reported. The aim of this study was to investigate blinding integrity during a treatment course of iTBS over the dorsomedial prefrontal cortex (DMPFC) in depression.MethodsForty-nine patients with depression from a double-blind-designed randomized controlled trial (NCT02905604) were included. Patients received either active or sham iTBS over the DMPFC with a placebo coil. The sham group received iTBS-synchronized transcutaneous electrical nerve stimulation.ResultsAfter one session, 74% of participants were able to correctly guess their treatment allocation. This was above chance level (p = 0.001). The percentage dropped to 64% and 56% after the fifth and last sessions. Belonging to the active group influenced the choice to guess “active” (odds ratio: 11.7, 95% CI 2.5–53.7). A higher treatment intensity of the sham treatment increased the probability to guess “active”, but pain did not influence the choice.ConclusionsBlinding integrity in iTBS trials must be investigated at study start to avoid uncontrolled confounding. Better sham methods are needed.     

Family Experiences and Self-Criticism in College Students: Testing a Model of Family Stress,Past Unfairness,and Self-Esteem

Marriage and Family Therapists and other mental health professionals are often unaware of the sexual activity of preadolescent girls. The reason for this is the lack of research reporting on the sexual behavior of these young people. Also, in many cases the family may attend therapy for an unrelated issue and the sexual activity goes unnoticed. The present paper is an exploration into the lives of pre-teenagers' (ages 8–13) sex lives as they reported them in Internet chat rooms. Research on the content of chat rooms on the Internet is practically non-existent regarding this age group. Based on reports from over 1,300 pre-teen girls over a five-year time period, the results indicate that for some young girls, their young lives are filled with sexual behavior of one sort or another. They appear to be well versed in sexual terms and behaviors. In some cases the girls are forced into sexuality by a relative; in other cases, they appear to engage freely in sex with their boyfriends; in yet other cases they are forced by an older male. The girls overwhelmingly report that their parents are unaware of their sexual chatting on the Internet, even though it occurred regularly throughout the day. These girls are at risk. They are at risk for pregnancy and for sexual transmitted diseases, including HIV, not to mention the concomitant psychological effects. The data also indicate that the girls do not think about the consequences of their sexual behavior. Birth control and condom use appear not to be issues of concern for these young girls. Given the increased accessibility and use of the Internet by young people and the ability to create private spaces, blogs, and soon which are often sexual in nature, it is important for marriage and family therapists to understand the level of sexualization of some of these young girls in order to better address their needs and the needs of their families.     

Short-range order in the arrangement of grains in two-dimensional polycrystals

Abstract

Experimental results for two-dimensional grain growth are compared with the results obtained from computer-generated random threefold vertex networks with a fixed one-particle distribution function. A considerable discrepancy in the two-particle distributions implies some kind of short-range order. New results in the computer simulation of normal grain growth are reported, demonstrating a similar kind of ordering. A simple relation is suggested for the quantity m _n, introduced by Aboav and the second moment of the one-particle distribution μ₂     

The effect of electropulsing on dislocation structures in [233] coplanar double-slip-oriented fatigued copper single crystals

The effect of high-current-density electropulsing on dislocation structures in a coplanar double-slip-oriented copper single crystal that had previously been fatigued is reported. The results show that, after electropulsing, vein structures are transformed to cell structures with some dark regions. It is proposed that the thermal compressive stress caused by electropulsing activates a coplanar slip system and leads to strong dislocation interactions between primary and coplanar slip systems, thereby forming cell structures. Partial recrystallization may occur by electropulsing, leading to the appearance of some dark regions.     

Rationality,group choice and expected utility

In this paper I propose a view uniformly extending expected utility calculations to both individual and group choice contexts. By way of three related cases I discuss the problems inherent in applying expected utility to group choice cases. I show that the problem with such group cases does not essentially depend upon the fact that more than one agent is involved. A modified strategy is then devised allowing the application of the expected utility formula to these otherwise problematic cases. One case, however, leads to contradiction. But recognizing the falsity of the proposition.(1) If an agent x knows options A and B are both available, and x knows that were he to do A he would be better off (in every respect) than were he to do B, then doing A is more rational for x than doing B,allows the resolution of the contradiction and also allows my modified strategy to resolve otherwise paradoxical cases of group choice such as the Prisoners' Dilemma.This paper is dedicated to my parents, Arleen Eichengreen and Alvin Richter, for their encouragement, understanding, and financial support. Very special thanks also go to Daniel Hunter, Richard Sharvy, and Paul Horwich. In addition I owe a great deal to discussions and correspondence with Michael Ferejohn, John Ferejohn, Kit Fine, Allan Gibbard, Dale Jamieson, Gregory Kavka, David Lewis, J. Karel Lambert, Alice Perrin, Howard Pospesel, Brian Skyrms, J. Howard Sobel, and Michael Tooley.     

Fiction as a Base of Interpretation Contexts

In this paper, I want to deal with the problem of how to find an adequate context of interpretation for indexical sentences that enables one to account for the intuitive truth-conditional content which some apparently puzzling indexical sentences like “I am not here now” as well as other such sentences contextually have. In this respect, I will pursue a fictionalist line. This line allows for shifts in interpretation contexts and urges that such shifts are governed by pretense, which has to be understood in terms of socially shared make-believe games. By appealing to pretense so conceived, I will show that the fictionalist perspective is halfway between an intentionalist perspective, according to which the above indexical sentences have to be interpreted in a shifted intended context, (this perspective is primarily defined by Predelli 1998, Analysis 58, 107; Mind and Language 13, 400) and a conventionalist perspective, according to which indexical reference shifts in accordance with a conventional setting. (For this perspective, cf. Corazza et al. 2002, Philosophical Studies 107, See also Corazza 2004, Reflecting the Mind: Indexicality and Quasi-Indexicality, Oxford University Press). Finally, I will claim that the fictionalist analysis of cases of non-ordinary uses of indexicals like “here” and “now” can be retained in face of a new alternative analysis of those cases in terms of an ‘unbound anaphora’ – theory (cf. Corazza 2004, Synthese 138, 145).