3,348 research outputs found
Fundamental relation between longitudinal and transverse conductivities in the quantum Hall system
We investigate the relation between the diagonal () and
off-diagonal () components of the conductivity tensor in the
quantum Hall system. We calculate the conductivity components for a short-range
impurity potential using the linear response theory, employing an approximation
that simply replaces the self-energy by a constant value
with the scattering time. The approximation is equivalent to assuming
that the broadening of a Landau level due to disorder is represented by a
Lorentzian with the width . Analytic formulas are
obtained for both and within the framework of this
simple approximation at low temperatures. By examining the leading terms in
and , we find a proportional relation between
and . The relation, after
slight modification to account for the long-range nature of the impurity
potential, is shown to be in quantitative agreement with experimental results
obtained in the GaAs/AlGaAs two-dimensional electron system at the low
magnetic-field regime where spin splitting is negligibly small.Comment: 21 pages, 8 figures, accepted for publication in J. Phys.: Condens.
Matte
Sex ratio influences the motivational salience of facial attractiveness
The sex ratio of the local population influences mating-related behaviours in many species. Recent experiments show that male-biased sex ratios increase the amount of financial resources men will invest in potential mates, suggesting that sex ratios influence allocation of mating effort in humans. To investigate this issue further, we tested for effects of cues to the sex ratio of the local population on the motivational salience of attractiveness in own-sex and opposite-sex faces. We did this using an effort-based key-press task, in which the motivational salience of facial attractiveness was assessed in samples of faces in which the ratio of male to female images was manipulated. The motivational salience of attractive opposite-sex, but not own-sex, faces was greater in the own-sex-biased (high competition for mates) than in the opposite-sex-biased (low competition for mates) condition. Moreover, this effect was not modulated by participant sex. These results present new evidence that sex ratio influences human mating-related behaviours. They also present the first evidence that the perceived sex ratio of the local population may modulate allocation of mating effort in women, as well as men
The Senator Waltzes
https://digitalcommons.library.umaine.edu/mmb-ps/2130/thumbnail.jp
Solutions of Schr\"odinger Equation with Generalized Inverted Hyperbolic Potential
We present the bound state solutions of the Schr\"odinger equation with
generalized inverted hyperbolic potential using the Nikiforov-Uvarov method. We
obtain the energy spectrum and the wave function with this potential for
arbitrary - state. We show that the results of this potential reduced to the
standard known potentials - Rosen-Morse, Poschl - Teller and Scarf potential as
special cases. We also discussed the energy equation and the wave function for
these special cases.Comment: 20pages, 5figure
Women's hormone levels modulate the motivational salience of facial attractiveness and sexual dimorphism
The physical attractiveness of faces is positively correlated with both behavioral and neural measures of their motivational salience. Although previous work suggests that hormone levels modulate women's perceptions of others’ facial attractiveness, studies have not yet investigated whether hormone levels also modulate the motivational salience of facial characteristics. To address this issue, we investigated the relationships between within-subject changes in women's salivary hormone levels (estradiol, progesterone, testosterone, and estradiol-to-progesterone ratio) and within-subject changes in the motivational salience of attractiveness and sexual dimorphism in male and female faces. The motivational salience of physically attractive faces in general and feminine female faces, but not masculine male faces, was greater in test sessions where women had high testosterone levels. Additionally, the reward value of sexually dimorphic faces in general and attractive female faces, but not attractive male faces, was greater in test sessions where women had high estradiol-to-progesterone ratios. These results provide the first evidence that the motivational salience of facial attractiveness and sexual dimorphism is modulated by within-woman changes in hormone levels
The reward value of infant facial cuteness tracks within-subject changes in women’s salivary testosterone
“Baby schema” refers to infant characteristics, such as facial cues, that
positively influence cuteness perceptions and trigger caregiving and protective
behaviors in adults. Current models of hormonal regulation of parenting
behaviors address how hormones may modulate protective behaviors and
nurturance, but not how hormones may modulate responses to infant
cuteness. To explore this issue, we investigated possible relationships
between the reward value of infant facial cuteness and within-woman changes
in testosterone, estradiol, and progesterone levels. Multilevel modeling of
these data showed that infant cuteness was more rewarding when women’s
salivary testosterone levels were high. Moreover, this within-woman effect of
testosterone was independent of the possible effects of estradiol and
progesterone and was not simply a consequence of changes in women’s
cuteness perceptions. These results suggest that testosterone may modulate
differential responses to infant facial cuteness, potentially revealing a new
route through which testosterone shapes selective allocation of parental
resources
Three-point density correlation functions in the fractional quantum Hall regime
In this paper we consider the three-particle density correlation function for
a fractional quantum Hall liquid. The study of this object is motivated by
recent experimental studies of fractional quantum Hall systems using inelastic
light scattering and phonon absorption techniques. Symmetry properties of the
correlation function are noted. An exact sum-rule is derived which this
quantity must obey. This sum-rule is used to assess the convolution
approximation that has been used to estimate the matrix elements for such
experiments. PACS Numbers: 73.40.Hm, 73.20.Mf, 72.10.DiComment: 12 pages + 1 (PS) figur
Women’s facial attractiveness is related to their body mass index, but not their salivary cortisol
Objectives: Although many theories of human facial attractiveness propose positive correlations between facial attractiveness and measures of actual health, evidence for such correlations is somewhat mixed. Here we sought to replicate a recent study reporting that women’s facial attractiveness is independently related to both their adiposity and cortisol.
Methods: Ninety-six women provided saliva samples, which were analyzed for cortisol level, and their height and weight, which were used to calculate their body mass index (BMI). A digital face image of each woman was also taken under standardized photographic conditions and rated for attractiveness.
Results: There was a significant negative correlation between women’s facial attractiveness and BMI. By contrast, salivary cortisol and facial attractiveness were not significantly correlated.
Conclusions: Our results suggest that the types of health information reflected in women's faces include qualities that are indexed by BMI, but do not necessarily include qualities that are indexed by cortisol
Reading of Waiting, Time and Social Change in S. N. A. Agoro’s Something To Die For
The study of waiting and time, hope and none fulfilment of hope, came into literary limelight in literature particularly in the dramas of Samuel Beckett, the absurdist playwright and others like Albert Camus, Martin Esslin and Eugene Ionesco. The subject is most prominent in Samuel Beckett’s seminal dramas - Waiting for Godot (1956) and End Game (1957). In these dramas waiting is presented as a static experience that generates the rise and fall of hope. It breeds frustration, alienation, faithlessness and depersonalization. The act of waiting as a critical feature of the human condition is the most significant and intense thematic engagement in Beckett’s Waiting for Godot. The study notes that aside the circle of the absurd art in drama, the subject of waiting and time has not been given adequate dramatic representation by dramatists outside the absurd background. It is against this backdrop that we attempt to explore the depiction and treatment of waiting, time and social change in the dramatic universe of existentialism created by some playwrights who have not been given scholarly attention. The study shall therefore undertake a dialectical consideration of the concept of waiting and time in Agoro’s Something to die Foran existential drama and raise new judgment in the appreciation of waiting and time from the perception of Christian reflection in literary limelight and scholarship.Keywords: dialectics, waiting and time, social change, absurdism, existentialis
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