Geometrical frustration yields fiber formation in self-assembly

Controlling the self-assembly of supramolecular structures is vital for living cells, and a central challenge for engineering at the nano- and microscales. Nevertheless, even particles without optimized shapes can robustly form well-defined morphologies. This is the case in numerous medical conditions where normally soluble proteins aggregate into fibers. Beyond the diversity of molecular mechanisms involved, we propose that fibers generically arise from the aggregation of irregular particles with short-range interactions. Using a minimal model of ill-fitting, sticky particles, we demonstrate robust fiber formation for a variety of particle shapes and aggregation conditions. Geometrical frustration plays a crucial role in this process, and accounts for the range of parameters in which fibers form as well as for their metastable character.Comment: 6 pages, 5 figures, 1 ancillary movie; to appear in Nature Physic

Detection of high-degree prograde sectoral mode sequences in the A-star KIC 8054146?

This paper examines the 46 frequencies found in the Delta Sct star KIC 8054146 involving a frequency spacing of exactly 2.814 c/d (32.57 microHz), which is also a dominant low-frequency peak near or equal to the rotational frequency. These 46 frequencies range up to 146 c/d. Three years of Kepler data reveal distinct sequences of these equidistantly spaced frequencies, including the basic sequence and side lobes associated with other dominant modes (i.e., small amplitude modulations). The amplitudes of the basic sequence show a high-low pattern. The basic sequence follows the equation fm = 2.8519 + m * 2.81421 c/d with m ranging from 25 to 35. The zero-point offset and the lack of low-order harmonics eliminate an interpretation in terms of a Fourier series of a non-sinusoidal light curve. The exactness of the spacing eliminates high-order asymptotic pulsation. The frequency pattern is not compatible with simple hypotheses involving single or multiple spots, even with differential rotation. The basic high-frequency sequence is interpreted in terms of prograde sectoral modes. These can be marginally unstable, while their corresponding low-degree counterparts are stable due to stronger damping. The measured projected rotation velocity (300 km/s) indicates that the star rotates with app. 70% of the Keplerian break-up velocity. This suggests a near equator-on view. We qualitatively examine the visibility of prograde sectoral high-degree g-modes in integrated photometric light in such a geometrical configuration and find that prograde sectoral modes can reproduce the frequencies and the odd-even amplitude pattern of the high-frequency sequence

Implications of CP violating 2HDM in B physics

The charged fermion mass matrices are invariant under $U(1)^3$ symmetry linked to the fermion number transformation. Under the condition that the definition of this symmetry in arbitrary weak basis does not depend upon Higgs parameters such as ratio of vacuum expectation values, a class of two Higgs doublet models (2HDM) can be identified in which tree level flavor changing neutral currents normally present in 2HDM are absent. However unlike the type I or type II Higgs doublet models, the charged Higgs couplings in these models contain additional flavor dependent CP violating phases. These phases can account for the recent hints of the beyond standard model CP violation in the $B_d$ and $B_s$ mixing. In particular, there is a range of parameters in which new phases do not contribute to the $K$ meson CP violation but give identical new physics phases in the $B_d$ and $B_s$ meson mixing.Comment: 7 pages, 1 figure, Talk given by Bhavik P. Kodrani at 16th International Symposium on Particles, Strings and Cosmology, July 19th - 23rd, 2010, Valencia, Spai

Implications for Wellness‐Based Supervision and Professional Quality of Life

This study evaluated the efficacy of the wellness model of supervision (WELMS; Lenz & Smith, 2010) for promoting changes across the perceptions of counselors‐in‐training (CITs) regarding professional quality of life. Three female participants (1 Caucasian, 2 Hispanic) were enrolled in a program accredited by the Council for Accreditation of Counseling and Related Educational Programs. Results of a single‐case research design with multiple baselines indicated that the WELMS was efficacious across client–CIT interactions on professional quality of life

Emotional Regulation and Interpersonal Effectiveness as Mechanisms of Change for Treatment Outcomes Within a DBT Program for Adolescents

Predictive modeling was used to identify the degree that hypothesized moderators of dialectical behavioral therapy for adolescents (DBT-A) treatment outcomes predicted anxiety and depression symptoms over time. Participants were 66 adolescents (41 girls; 25 boys) with a mean age of 15.38 years (SD = 1.51) who completed a 7-week DBT-A intervention. Analyses revealed convergent models, wherein emotion regulation and interpersonal effectiveness were substantial predictors of change in the symptoms of anxiety, F(4, 65) = 23.21, p \u3c .01, R2 = .60, and depression, F(4, 65) = 29.76, p \u3c .01, R2 = .66

Crippling effects of 'hyper-rational' planning / 956

Includes bibliographical references