77 research outputs found
The reduced ring of the -graded -equivariant stable stems
We describe in terms of generators and relations the ring structure of the
-graded -equivariant stable stems modulo the
ideal of all nilpotent elements. As a consequence, we also record the ring
structure of the homotopy groups of the rational -equivariant sphere
.Comment: 13 page
CiteSpace Visual Analysis of Community Pharmacy Services in China: Bridging Local Insights and Global Trends
Purpose: This research traces the history of pharmacy services research in Chinese pharmacies over the past twenty years and attempts to identify key trends and hotspots consistent with global practices. Methodology: From January 2002 to December 2022, we leveraged databases such as CNKI, VIP, and Wanfang and deployed CiteSpace 5.8.R3 to visualize publication trends, authorship, and institutional contributions within the field. Results: Our synthesis highlights critical developments in drug safety monitoring, prescription management, pharmacoeconomics, and public health education and highlights the leadership of respected researchers and institutions. Conclusion: The “Internet+” paradigm is identified as an important catalyst for pharmacy services innovation, with implications that extend beyond China and suggest models for international adaptation and strategy development
Heat Adaptation Induced Cross Protection Against Ethanol Stress in Tetragenococcus halophilus: Physiological Characteristics and Proteomic Analysis
Ethanol is a toxic factor that damages membranes, disturbs metabolism, and may kill the cell. Tetragenococcus halophilus, considered as the cell factory during the manufacture of traditional fermented foods, encounters ethanol stress, which may affect the viability and fermentative performance of cells. In order to improve the ethanol tolerance of T. halophilus, a strategy based on cross protection was proposed in the current study. The results indicated that cross protection induced by heat preadaptation (45°C for 1.5 h) could significantly improve the stress tolerance (7.24-fold increase in survival) of T. halophilus upon exposure to ethanol (10% for 2.5 h). Based on this result, a combined analysis of physiological approaches and TMT-labeled proteomic technology was employed to investigate the protective mechanism of cross protection in T. halophilus. Physiological analysis showed that the heat preadapted cells exhibited a better surface phenotype, higher membrane integrity, and higher amounts of unsaturated fatty acids compared to unadapted cells. Proteomic analysis showed that a total of 163 proteins were differentially expressed in response to heat preadaptation. KEGG enrichment analysis showed that energy metabolism, membrane transport, peptidoglycan biosynthesis, and genetic information processing were the most abundant metabolic pathways after heat preadaptation. Three proteins (GpmA, AtpB, and TpiA) involved in energy metabolism and four proteins (ManM, OpuC, YidC, and HPr) related to membrane transport were up-regulated after heat preadaptation. In all, the results of this study may help understand the protective mechanisms of preadaptation and contribute to the improvement of the stress resistance of T. halophilus during industrial processes
Highly efficient room-temperature nonvolatile magnetic switching by current in Fe3GaTe2 thin flakes
Effectively tuning magnetic state by using current is essential for novel
spintronic devices. Magnetic van der Waals (vdW) materials have shown superior
properties for the applications of magnetic information storage based on the
efficient spin torque effect. However, for most of known vdW ferromagnets, the
ferromagnetic transition temperatures lower than room temperature strongly
impede their applications and the room-temperature vdW spintronic device with
low energy consumption is still a long-sought goal. Here, we realize the highly
efficient room-temperature nonvolatile magnetic switching by current in a
single-material device based on vdW ferromagnet Fe3GaTe2. Moreover, the
switching current density and power dissipation are about 300 and 60000 times
smaller than conventional spin-orbit-torque devices of magnet/heavymetal
heterostructures. These findings make an important progress on the applications
of magnetic vdW materials in the fields of spintronics and magnetic information
storage.Comment: 18 page2, 4 figure
Crop Area Estimation from UAV Transect and MSR Image Data Using Spatial Sampling Method
AbstractUsing remote sensing data to estimate crop area is efficient to a wide range of end-users, including government agencies, farmers and researchers. Moderate spatial resolution (MSR) image data are widely used to estimate crop area. But its accuracy can’t meet the demands of precision. Spatial sampling techniques integrated the strengths of remote sensing and sampling survey are being widely used. This method need large sample size which is cannot be guaranteed by remote sensing due to weather. The Unmanned Aerial Vehicle (UAV) can be used as an effective way to guarantee enough sample size. This paper proposed a spatial sampling method using MSR image classification results and UAV transects, a stratified random sampling method was proposed, area-scale (from MSR image classification) was used as auxiliary variable to guide the distribution of UAV transects, which had proved that 2% sampling ratio can make the crop area estimation accuracy more than 95% with a 95% confidence interval
Pressure induced superconductivity in WB2 and ReB2 through modifying the B layers
The recent discovery of superconductivity up to 32 K in the pressurized MoB2
reignites the interests in exploring high-Tc superconductors in
transition-metal diborides. Inspired by that work, we turn our attention to the
5d transition-metal diborides. Here we systematically investigate the responses
of both structural and physical properties of WB2 and ReB2 to external
pressure, which possess different types of boron layers. Similar to MoB2, the
pressure-induced superconductivity was also observed in WB2 above 60 GPa with a
maximum Tc of 15 K at 100 GPa, while no superconductivity was detected in ReB2
in this pressure range. Interestingly, the structures at ambient pressure for
both WB2 and ReB2 persist to high pressure without structural phase
transitions. Theoretical calculations suggest that the ratio of flat boron
layers in this class of transition-metal diborides may be crucial for the
appearance of high Tc. The combined theoretical and experimental results
highlight the effect of geometry of boron layers on superconductivity and shed
light on the exploration of novel high-Tc superconductors in borides.Comment: 17 pages,5 figure
Magnetic topological insulator MnBi6Te10 with zero-field ferromagnetic state and gapped Dirac surface states
Magnetic topological insulators (TIs) with nontrivial topological electronic
structure and broken time-reversal symmetry exhibit various exotic topological
quantum phenomena. The realization of such exotic phenomena at high temperature
is one of central topics in this area. We reveal that MnBi6Te10 is a magnetic
TI with an antiferromagnetic ground state below 10.8 K whose nontrivial
topology is manifested by Dirac-like surface states. The ferromagnetic axion
insulator state with Z4 = 2 emerges once spins polarized at field as low as 0.1
T, accompanied with saturated anomalous Hall resistivity up to 10 K. Such a
ferromagnetic state is preserved even external field down to zero at 2 K.
Theoretical calculations indicate that the few-layer ferromagnetic MnBi6Te10 is
also topologically nontrivial with a non-zero Chern number. Angle-resolved
photoemission spectroscopy experiments further reveal three types of Dirac
surface states arising from different terminations on the cleavage surfaces,
one of which has insulating behavior with an energy gap of ~ 28 meV at the
Dirac point. These outstanding features suggest that MnBi6Te10 is a promising
system to realize various topological quantum effects at zero field and high
temperature.Comment: 18 pages, 4 figures and 1 tabl
Nearly-room-temperature ferromagnetism and tunable anomalous Hall effect in atomically thin Fe4CoGeTe2
Itinerant ferromagnetism at room temperature is a key ingredient for spin
transport and manipulation. Here, we report the realization of
nearly-room-temperature itinerant ferromagnetism in Co doped Fe5GeTe2 thin
flakes. The ferromagnetic transition temperature TC (323 K - 337 K) is almost
unchanged when thickness is down to 12 nm and is still about 284 K at 2 nm
(bilayer thickness). Theoretical calculations further indicate that the
ferromagnetism persists in monolayer Fe4CoGeTe2. In addition to the robust
ferromagnetism down to the ultrathin limit, Fe4CoGeTe2 exhibits an unusual
temperature- and thickness-dependent intrinsic anomalous Hall effect. We
propose that it could be ascribed to the dependence of band structure on
thickness that changes the Berry curvature near the Fermi energy level subtly.
The nearly-room-temperature ferromagnetism and tunable anomalous Hall effect in
atomically thin Fe4CoGeTe2 provide opportunities to understand the exotic
transport properties of two-dimensional van der Waals magnetic materials and
explore their potential applications in spintronics.Comment: 28 pages, 4 figures, 1 tabl
Eightfold Fermionic Excitation in a Charge Density Wave Compound
Unconventional quasiparticle excitations in condensed matter systems have
become one of the most important research frontiers. Beyond two- and fourfold
degenerate Weyl and Dirac fermions, three-, six- and eightfold symmetry
protected degeneracies have been predicted however remain challenging to
realize in solid state materials. Here, charge density wave compound TaTe4 is
proposed to hold eightfold fermionic excitation and Dirac point in energy
bands. High quality TaTe4 single crystals are prepared, where the charge
density wave is revealed by directly imaging the atomic structure and a
pseudogap of about 45 meV on the surface. Shubnikov de-Haas oscillations of
TaTe4 are consistent with band structure calculation. Scanning tunneling
microscopy reveals atomic step edge states on the surface of TaTe4. This work
uncovers that charge density wave is able to induce new topological phases and
sheds new light on the novel excitations in condensed matter materials.Comment: Accepted by PRB:
https://journals.aps.org/prb/accepted/7907cK4eW0b1ee0b93fd67c1b42942bbb08eafc3
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