31 research outputs found
Anisotropy of thermal conductivity oscillations in relation to the Kitaev spin liquid phase
In the presence of external magnetic field, the Kitaev model could either
hosts gapped topological anyon or gapless Majorana fermions. In
-RuCl, the gapped and gapless cases are only separated by a
thirty-degree rotation of the in-plane magnetic field vector. The
presence/absence of the spectral gap is key for understanding the thermal
transport behavior in -RuCl. Here, we study the anisotropy of the
oscillatory features of thermal conductivity in -RuCl. We examine
the oscillatory features of thermal conductivities (k//a, k//b) with fixed
external fields and found distinct behavior for the gapped (B//a) and gapless
(B//b) scenarios. Furthermore, we track the evolution of thermal resistivity
() and its oscillatory features with the rotation of in-plane
magnetic fields from B//b to B//a. The thermal resistivity
display distinct rotational symmetries before and after the emergence of the
field induced Kitaev spin liquid phase. These experiment data suggest close
correlations between the oscillatory features of thermal conductivity, the
underlying Kitaev spin liquid phase and the fermionic excitation it holds
Construction of ionic liquid-Pd/C based bifunction catalysts for the synthesis of UV-P
Adding light stabilizers to polymeric materials can inhibit or delay the light aging effect and improve the light resistance of materials. 2-(2′-Hydroxy-5′-methylphenyl) benzotriazole (UV-P), as a typical benzotriazole ultraviolet absorber, is widely used in various polymer synthetic materials and products owning to its outstanding oil resistance, color change resistance and low volatility. Currently, it is of great theoretical and practical significance to develop an environmentally friendly method to produce UV-P. Here, we introduce ionic liquids, tetra-butyl ammonium hydroxide, into the palladium-based catalyst, design a “transfer hydrogenation site - alkaline site” duel active center system, and investigate the physical and chemical properties and possible mechanism of this bifunction catalyst system. Such heterogeneous catalytic transfer hydrogenation method can remain 100% conversion and 93.86% selectivity. This bifunction catalyst also shows an outstanding stability when it was used for ten times, proving a green and efficient transfer hydrogenation method for the synthesis of UV-P
Topological Nernst and topological thermal Hall effect in rare-earth kagome ScMnSn
Thermal and thermoelectric measurements are known as powerful tools to
uncover the physical properties of quantum materials due to their sensitivity
towards the scattering and chirality of heat carriers. We use these techniques
to confirm the presence of momentum and real-space topology in ScMnSn.
There is an unconventional dramatic increase in the Seebeck coefficient on
entering the transverse conical spiral (TCS) below = 200 K suggesting an
unusual scattering of heat carriers. In addition, the observed anomalous
thermal Hall effect and the anomalous Nernst effect indicates non-zero Berry
curvature in -space. Furthermore, we identify a significant topological
contribution to the thermal Hall and Nernst signals in the TCS phase revealing
the impacts of real-space Berry curvature. We discuss the presence of
topological thermal Hall effect and topological Nernst effect for the first
time in the diverse HfFeGe family. This study illustrates the
importance of transverse thermal and thermoelectric measurements to investigate
the origin of topological transport in the non-coplanar magnetic phases in this
family of kagome metals.Comment: 9 pages, 6 figure
Choriocarcinoma of unknown origin with multiple organ metastasis and cerebral hemorrhage: A case report and literature review
Concussive Injury before or after Controlled Cortical Impact Exacerbates Histopathology and Functional Outcome in a Mixed Traumatic Brain Injury Model in Mice
Association of Plasminogen Activator Inhibitor Type 2 (PAI-2) with Proteasome within Endothelial Cells Activated with Inflammatory Stimuli
Preparation and properties of sodium bicarbonate-incorporated LDPE films with deodorizing function for kimchi packaging
A physiological function of inflammation-associated SerpinB2 is regulation of adaptive immunity
SerpinB2 (plasminogen activator inhibitor-2) is widely described as an inhibitor of urokinase plasminogen activator; however, SerpinB2(-/-) mice show no detectable increase in urokinase plasminogen activator activity. In this study, we describe an unexpected immune phenotype in SerpinB2(-/-) mice. After immunization with OVA in CIA, SerpinB2(-/-) mice made approximate to 6-fold more IgG2c and generated approximate to 2.5-fold more OVA-specific IFN-gamma-secreting T cells than SerpinB2(+/+) littermate controls. In SerpinB2(+/+) mice, high inducible SerpinB2 expression was seen at the injection site and in macrophages low levels in draining lymph nodes and conventional dendritic cells, and no expression was seen in plasmacytoid dendritic, B, T, or NK cells. SerpinB2(-/-) macrophages promoted greater IFN-gamma secretion from wild-type T cells in vivo and in vitro and, when stimulated with anti-CD40/IFN-gamma or cultured with wild-type T cells in vitro, secreted more Th1-promoting cytokines than macrophages from littermate controls. Draining lymph node SerpinB2(-/-) myeloid APCs similarly secreted more Th1-promoting cytokines when cocultured with wild-type T cells. Regulation of Th1 responses thus appears to be a physiological function of inflammation-associated SerpinB2; an observation that may shed light on human inflammatory diseases like pre-eclampsia, lupus, asthma, scleroderma, and periodontitis, which are associated with SerpinB2 polymorphisms or dysregulated SerpinB2 expression. The Journal of Immunology, 2010, 184: 2663-2670