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Attraction symmetry

B Li, C Q Xu, W Zhou, W H Jiao, R Sankar, F M Zhang, H H Hou, X F Jiang, B Qian, B Chen, A F Bangura, Xiaofeng Xu
Superconductivity in noncentrosymmetric compounds has attracted sustained interest in the last decades. Here we present a detailed study on the transport, thermodynamic properties and the band structure of the noncentrosymmetric superconductor La 7 Ir 3 (T c  ~ 2.3 K) that was recently proposed to break the time-reversal symmetry. It is found that La7Ir3 displays a moderately large electronic heat capacity (Sommerfeld coefficient γ n  ~ 53.1 mJ/mol K2) and a significantly enhanced Kadowaki-Woods ratio (KWR ~32 μΩ cm mol2 K2 J-2) that is greater than the typical value (~10 μΩ cm mol2 K2 J-2) for strongly correlated electron systems...
January 12, 2018: Scientific Reports
So Jung Park, Seyong Kim, Daeseong Yong, Youngson Choe, Joona Bang, Jaeup U Kim
We systematically examined the polymer-mediated interparticle interactions between polymer-grafted nanoparticles (NPs) within chemically identical homopolymer matrices through experimental and computational efforts. In experiments, we prepared thermally stable gold NPs grafted with polystyrene (PS) or poly(methyl methacrylate) (PMMA), and they were mixed with corresponding homopolymers. The nanocomposites are well dispersed when the molecular weight ratio of free to grafted polymers, α, is small. For α above 10, NPs are partially aggregated or clumped within the polymer matrix...
January 12, 2018: Soft Matter
Daniel S Calovi, Alexandra Litchinko, Valentin Lecheval, Ugo Lopez, Alfonso Pérez Escudero, Hugues Chaté, Clément Sire, Guy Theraulaz
The development of tracking methods for automatically quantifying individual behavior and social interactions in animal groups has open up new perspectives for building quantitative and predictive models of collective behavior. In this work, we combine extensive data analyses with a modeling approach to measure, disentangle, and reconstruct the actual functional form of interactions involved in the coordination of swimming in Rummy-nose tetra (Hemigrammus rhodostomus). This species of fish performs burst-and-coast swimming behavior that consists of sudden heading changes combined with brief accelerations followed by quasi-passive, straight decelerations...
January 11, 2018: PLoS Computational Biology
Xixia Liu, Tang Jiao Huang, Liuyang Zhang, Baoshan Tang, Nengduo Zhang, Diwen Shi, Hao Gong
Lead halide perovskite has attracted striking attention recently due to their appealing properties. However, toxicity and stability are two main factors restricting its application. In this work, we experimentally synthesized less toxic and highly stable Pd-based hybrid perovskite after exploring different experimental conditions. This new hybrid organic-inorganic perovskite (CH₃NH₃)₂PdBr₄ was found to be an orthorhombic crystal (Cmce, Z=4) with lattice parameters a=8.00 Å, b=7.99 Å, c= 18.89 Å. The Cmce symmetry and lattices parameters were confirmed using Pawley refinement...
January 11, 2018: Chemistry: a European Journal
Arghya Majee, Markus Bier, Rudolf Podgornik
The interaction between two chemically identical charge-regulated surfaces is studied using the classical density functional theory. In contrast to common expectations and assumptions, under certain realistic conditions we find a spontaneous emergence of disparate charge densities on the two surfaces. The surface charge densities can differ not only in their magnitude, but quite unexpectedly, even in their sign, implying that the electrostatic interaction between the two chemically identical surfaces can be attractive instead of repulsive...
January 11, 2018: Soft Matter
Terrence C Keaney, Robert Anolik, André Braz, Michael Eidelman, Joseph A Eviatar, Jeremy B Green, Derek H Jones, Vic A Narurkar, Anthony M Rossi, Conor J Gallagher
<p>BACKGROUND: The number of nonsurgical aesthetic procedures performed in men is growing rapidly. However, there are limited data on treatment principles and goals for the male aesthetic patient.</p> <p>OBJECTIVE: To review the objective data available on male aging and aesthetics and to synthesize with expert opinion on treatment considerations specific to male patients.</p> <p>METHODS: Expert advisors met to discuss anatomical differences in male versus female facial anatomy related to aging, facial treatment preferences in aesthetically oriented men, and current dosing data for facial injectable treatments in male versus female patients...
January 1, 2018: Journal of Drugs in Dermatology: JDD
Jinlong Yu, Ning Sun, Hui Zhai
In this Letter we present a theorem on the dynamics of the generalized Hubbard models. This theorem shows that the symmetry of the single-particle Hamiltonian can protect a kind of dynamical symmetry driven by the interactions. Here the dynamical symmetry refers to the phenomenon that time evolution of certain observables are symmetric between the repulsive and attractive Hubbard models. We demonstrate our theorem with three different examples in which the symmetry involves bipartite lattice symmetry, reflection symmetry, and translation symmetry, respectively...
December 1, 2017: Physical Review Letters
Mirko Scholz, Kawon Oum, Thomas Lenzer
Trivalent bismuth compounds featuring octahedral halide coordination, such as BiI3, double-perovskite structures and vacancy-ordered perovskite derivatives, have recently attracted considerable attention as potential environmentally benign thin film materials for solar light-harvesting and optoelectronic applications aiming to replace toxic lead-based perovskites. Yet, their photovoltaic performance still lags considerably behind their lead-counterparts. Improving their performance requires a detailed knowledge of the photoinduced carrier dynamics and kinetics in these systems...
December 20, 2017: Physical Chemistry Chemical Physics: PCCP
Tianyu Zhu, Piotr de Silva, Troy Van Voorhis
Chemical bonding plays a central role in the description and understanding of chemistry. Many methods have been proposed to extract information about bonding from quantum chemical calculations, majority of them resorting to molecular orbitals as basic descriptors. Here, we present a method called Self-Attractive Hartree (SAH) decomposition, to unravel pairs of electrons directly from electron density, which unlike molecular orbitals, is a well defined observable that can be accessed experimentally. The key idea is to partition the density into a sum of one-electron fragments which simultaneously maximize self-repulsion and maintain regular shapes...
December 11, 2017: Journal of Chemical Theory and Computation
Arpita Varadwaj, Pradeep R Varadwaj, Koichi Yamashita
Coulomb's law states that like charges repel, and unlike charges attract. However, it has recently been theoretically revealed that two similarly charged conducting spheres will almost always attract each other when both are in close proximity. Using multiscale first principles calculations, we illustrate practical examples of several intermolecular complexes that are formed by the consequences of attraction between positive atomic sites of similar or dissimilar electrostatic surface potential on interacting molecules...
December 11, 2017: Journal of Computational Chemistry
Jun Harada, Naho Yoneyama, Seiya Yokokura, Yukihiro Takahashi, Atsushi Miura, Noboru Kitamura, Tamotsu Inabe
Plastic crystals represent a unique compound class that is often encountered in molecules with globular structures. The highly symmetric cubic crystal structure of plastic crystals endows these materials with multiaxial ferroelectricity that allows a three-dimensional realignment of the polarization axes of the crystals, which cannot be achieved using conventional molecular ferroelec-tric crystals with low crystal symmetry. In this work, we focused our attention on malleability as another characteristic feature of plastic crystals...
December 11, 2017: Journal of the American Chemical Society
Guoqing Chang, Su-Yang Xu, Benjamin J Wieder, Daniel S Sanchez, Shin-Ming Huang, Ilya Belopolski, Tay-Rong Chang, Songtian Zhang, Arun Bansil, Hsin Lin, M Zahid Hasan
The theoretical proposal of chiral fermions in topological semimetals has led to a significant effort towards their experimental realization. In particular, the Fermi surfaces of chiral semimetals carry quantized Chern numbers, making them an attractive platform for the observation of exotic transport and optical phenomena. While the simplest example of a chiral fermion in condensed matter is a conventional |C|=1 Weyl fermion, recent theoretical works have proposed a number of unconventional chiral fermions beyond the standard model which are protected by unique combinations of topology and crystalline symmetries...
November 17, 2017: Physical Review Letters
Valeri P Frolov, Pavel Krtouš, David Kubizňák
The study of higher-dimensional black holes is a subject which has recently attracted vast interest. Perhaps one of the most surprising discoveries is a realization that the properties of higher-dimensional black holes with the spherical horizon topology and described by the Kerr-NUT-(A)dS metrics are very similar to the properties of the well known four-dimensional Kerr metric. This remarkable result stems from the existence of a single object called the principal tensor. In our review we discuss explicit and hidden symmetries of higher-dimensional Kerr-NUT-(A)dS black hole spacetimes...
2017: Living Reviews in Relativity
Yan Zhang, Xiaoying Wang, Juan Wang, Lili Zhang, Yu Xiang
The purpose of the present study is to explore the fixed model for the explicit judgments of attractiveness and infer which features are important to judge the facial attractiveness. Behavioral studies on the perceptual cues for female facial attractiveness implied three potentially important features: averageness, symmetry, and sexual dimorphy. However, these studies did not explained which regions of facial images influence the judgments of attractiveness. Therefore, the present research recorded the eye movements of 24 male participants and 19 female participants as they rated a series of 30 photographs of female facial attractiveness...
2017: Frontiers in Psychology
Xiu-Ying Zheng, You-Hong Jiang, Gui-Lin Zhuang, Da-Peng Liu, Hong-Gang Liao, Xiang-Jian Kong, La-Sheng Long, Lan-Sun Zheng
Nanoscale inorganic wheel-shaped structures are one of the most striking molecular aggregations. Here, we report the synthesis of a gigantic lanthanide wheel cluster containing 140 Gd3+ atoms. As the largest lanthanide cluster reported thus far, {Gd140} features an attractive wheel-like structure with tenfold symmetry. The nanoscopic molecular wheel possesses the largest diameter of 6.0 nm and displays high stability in solution, which allows direct visualization by scanning transmission electron microscopy (STEM)...
December 4, 2017: Journal of the American Chemical Society
Qian Zhang, Shuhui Tao, Ruowei Yi, Chunhui He, Ce Zhou Zhao, Weitao Su, Alexander Smogunov, Yannick J Dappe, Richard J Nichols, Li Yang
The unique structural and electronic characteristics of graphene make it an attractive contact for fundamental single molecule electrical studies. With this in mind, we have probed here the electrical conductance of a molecular junction based on alkane-diamine chains sandwiched between a gold and a graphene electrode. Using an STM based break junction method combined with Density Functional Theory based transport calculations, we demonstrate that the resulting attenuation factor turns out to be much lower when compared to the standard molecular junction between two gold electrodes...
November 27, 2017: Journal of Physical Chemistry Letters
Brigitte Pansu, Jean-François Sadoc
Understanding how soft particles can fill the space is still an open question. Structures far from classical FCC or BCC phases are now commonly experimentally observed in many different systems. Models based on pair interaction between soft particles are at present much studied in 2D. Pair interactions with two different lengths have been shown to lead to quasicrystalline architectures. It is also the case for a hard core with a square repulsive shoulder potential. In 3D, global approaches have been proposed for instance by minimizing the interface area between the deformed objects in the case of foams or micellar systems or using a self-consistent mean-field theory in copolymer melts...
November 24, 2017: European Physical Journal. E, Soft Matter
S K Adhikari
We study spontaneous symmetry breaking (SSB), Josephson oscillation, and self-trapping in a stable, mobile, three-dimensional matter-wave spherical quantum ball self-bound by attractive two-body and repulsive three-body interactions. The SSB is realized by a parity-symmetric (a) one-dimensional (1D) double-well potential or (b) a 1D Gaussian potential, both along the z axis and no potential along the x and y axes. In the presence of each of these potentials, the symmetric ground state dynamically evolves into a doubly-degenerate SSB ground state...
November 22, 2017: Scientific Reports
Ian D Stephen, Vivian Hiew, Vinet Coetzee, Bernard P Tiddeman, David I Perrett
Facial cues contribute to attractiveness, including shape cues such as symmetry, averageness, and sexual dimorphism. These cues may represent cues to objective aspects of physiological health, thereby conferring an evolutionary advantage to individuals who find them attractive. The link between facial cues and aspects of physiological health is therefore central to evolutionary explanations of attractiveness. Previously, studies linking facial cues to aspects of physiological health have been infrequent, have had mixed results, and have tended to focus on individual facial cues in isolation...
2017: Frontiers in Psychology
Urszula M Marcinkowska, Andrzej Galbarczyk, Grazyna Jasienska
Although under investigation for more than two decades, a common agreement on the occurrence of cyclical shifts in women's masculinity and symmetry preferences is still missing. Such shifts are considered to be an important feature of sexual selection as they supposedly direct women's attention towards cues for "good genes" (e.g. masculinity and symmetry) during times when probability of conception is the highest. Multiple studies have, however, failed to find these shifts. We attempt to address this lack of agreement analysing a sample of 110 healthy women, using intra-participant design and repeated measurements of oestradiol and LH during the cycle...
November 14, 2017: Psychoneuroendocrinology
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