221 research outputs found
trans-Bis(1-cyclohexylpyrrolidin-2-one)dinitratopalladium(II)
In the title compound, [Pd(NO3)2(C10H17NO)2], the PdII centre is located on an inversion center and is coordinated in a square-planar geometry by two O atoms of the monodentate nitrate groups and two carbonyl O atoms of the 1-cyclohexylpyrrolidin-2-one ligands
Empirical Studies on Corporate Behavior in Japan
【学位授与の要件】中央大学学位規則第4条第1項【論文審査委員主査】本庄 裕司(中央大学商学部教授)【論文審査委員副査】小野 有人(中央大学商学部教授), 原田 喜美枝(中央大学商学部教授)博士(経済学)中央⼤
Photocurrent induced by a bicircular light drive in centrosymmetric systems
A bicircular light (BCL) consists of left and right circularly polarized
lights with different frequencies, and draws a rose-like pattern with a
rotational symmetry determined by the ratio of the two frequencies. Here we
show that an application of a BCL to centrosymmetric systems allows a
photocurrent generation through introduction of an effective polarity to the
system. We derive formulas for the BCL-induced photocurrent from a standard
perturbation theory, which is then applied to a simple 1D model and 3D
Dirac/Weyl semimetals. A nonperturbative effect with strong light intensity is
also discussed with the Floquet technique.Comment: 12 pages, 6 figure
Strongly Iridescent Hybrid Photonic Sensors Based on Self-Assembled Nanoparticles for Hazardous Solvent Detection
Facile detection and the identification of hazardous organic solvents are essential for ensuring global safety and avoiding harm to the environment caused by industrial wastes. Here, we present a simple method for the fabrication of silver-coated monodisperse polystyrene nanoparticle photonic structures that are embedded into a polydimethylsiloxane (PDMS) matrix. These hybrid materials exhibit a strong green iridescence with a reflectance peak at 550 nm that originates from the close-packed arrangement of the nanoparticles. This reflectance peak measured under Wulff-Bragg conditions displays a 20 to 50 nm red shift when the photonic sensors are exposed to five commonly employed and highly hazardous organic solvents. These red-shifts correlate well with PDMS swelling ratios using the various solvents, which suggests that the observable color variations result from an increase in the photonic crystal lattice parameter with a similar mechanism to the color modulation of the chameleon skin. Dynamic reflectance measurements enable the possibility of clearly identifying each of the tested solvents. Furthermore, as small amounts of hazardous solvents such as tetrahydrofuran can be detected even when mixed with water, the nanostructured solvent sensors we introduce here could have a major impact on global safety measures as innovative photonic technology for easily visualizing and identifying the presence of contaminants in water
Giant Magnetochiral Anisotropy in Weyl-semimetal WTe2 Induced by Diverging Berry Curvature
The concept of Berry curvature is essential for various transport phenomena.
However, an effect of the Berry curvature on magnetochiral anisotropy, i.e.
nonreciprocal magneto-transport, is still elusive. Here, we report the Berry
curvature originates the large magnetochiral anisotropy. In Weyl-semimetal
WTe2, we observed the strong enhancement of the magnetochiral anisotropy when
the Fermi level is located near the Weyl points. Notably, the maximal figure of
merit reaches , which
is the largest ever reported in bulk materials. Our semiclassical calculation
shows that the diverging Berry curvature at the Weyl points strongly enhances
the magnetochiral anisotropy.Comment: 26 page
Multiband superconductivity with unexpected deficiency of nodal quasiparticles in CeCu2Si2
Superconductivity in the heavy-fermion compound CeCu2Si2 is a prototypical
example of Cooper pairs formed by strongly correlated electrons. For more than
30 years, it has been believed to arise from nodal d-wave pairing mediated by a
magnetic glue. Here, we report a detailed study of the specific heat and
magnetization at low temperatures for a high-quality single crystal.
Unexpectedly, the specific-heat measurements exhibit exponential decay with a
two-gap feature in its temperature dependence, along with a linear dependence
as a function of magnetic field and the absence of oscillations in the field
angle, reminiscent of multiband full-gap superconductivity. In addition, we
find anomalous behavior at high fields, attributed to a strong Pauli
paramagnetic effect. A low quasiparticle density of states at low energies with
a multiband Fermi-surface topology would open a new door into electron pairing
in CeCu2Si2.Comment: 5 pages, 4 figures (main text) + 5 pages, 6 figures (supplemental
material), published in Phys. Rev. Let
Thermodynamic study of gap structure and pair-breaking effect by magnetic field in the heavy-fermion superconductor CeCu2Si2
This paper presents the results of specific-heat and magnetization
measurements, in particular their field-orientation dependence, on the first
discovered heavy-fermion superconductor CeCuSi (
K). We discuss the superconducting gap structure and the origin of the
anomalous pair-breaking phenomena, leading e.g., to the suppression of the
upper critical field , found in the high-field region. The data
show that the anomalous pair breaking becomes prominent below about 0.15 K in
any field direction, but occurs closer to for . The
presence of this anomaly is confirmed by the fact that the specific-heat and
magnetization data satisfy standard thermodynamic relations. Concerning the gap
structure, field-angle dependences of the low-temperature specific heat within
the and planes do not show any evidence for gap nodes. From
microscopic calculations in the framework of a two-band full-gap model, the
power-law-like temperature dependences of and , reminiscent of nodal
superconductivity, have been reproduced reasonably. These facts further support
multiband full-gap superconductivity in CeCuSi.Comment: 10 pages, 8 figures, published in Phys. Rev.
Comprehensive identification of sphingolipid species by in silico retention time and tandem mass spectral library
Additional file 1. Figure S1 The fragment assignments of 12 sphingolipid classes. The annotations were combinatorially performed by hydrogen rearrangement rules in combination with substantial manual curation. The original spectra were obtained from LC/MS data of some biological samples including human cells, mouse tissues, and plant species
Contents of the Digital Natural History Museum of Hiroshima University, especially in the field of biology
広島大学デジタル自然史博物館は,広島大学の開学以来長年にわたって蓄積された教育・研究に関する知的資産を外部に公開し,生涯学習や学校教育のために活用することを目的として設置されている。デジタル自然史博物館には生物学や地学とそれに関係する資料が含まれる。特徴のあるコンテンツとしてはコケ植物や世界遺産宮島に関するものがあげられる。コンテンツの大部分は日本語であり,アクセス数は2015年度以降増加傾向にある。今後,現在進めているMediaWiki を使ったシステムへの移行を進めるとともに,コンテンツの充実やICT を使った学習への対応,運用母体の強化などを通じて,教育・研究のためだけでなく地域貢献のためのリソースとして発展させる計画である。The Digital Natural History Museum of Hiroshima University is a cluster of web sites for dissemination and practical use of educational and research resources for lifelong learning as well as school education in collaboration with laboratories and centers of Hiroshima University, Japan. The museum site includes contents on biological, environmental and earth sciences, mainly in Japanese with some English, especially bryophytes and the world heritage listed Itsukushima (Miyajima) Island, Hiroshima Prefecture, Japan. Online site access has increased since 2015. The museum site is now transferring the html based system to the MediaWiki system which is a free and open-source wiki software. For regional studies we plan to expand significantly the content of available resources to enable greater use and ease of access through information and communication technology (ICT)
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