1,424 research outputs found
1-(2,4-Dichlorobenzyl)pyridinium bis(2-sulfanylidene-1,3-dithiole-4,5-dithiolato-κ2 S,S′)nickelate(III)
In the title compound, (C12H10Cl2N)[Ni(C3S5)2], the NiIII atom is chelated by two bidentate 2-sulfanylidene-1,3-dithiole-4,5-dithiolate (dmit) dianions and shows a distorted square-planar geometry. The two dmit ligands are twisted with respect to each other by 3.21 (2)°. In the cation, the two aromatic groups linked by the methylene bridging group form a dihedral angle of 68.09 (2)°. S⋯S [3.6212 (11) and 3.5573 (9) Å] and Ni⋯S [3.566 (2)Å] interactions influence the arrangement of the anions in the crystal
Vacancy expansion in alpha-Ti under tensile loads at different strain rates with MD simulation
In order to analyze the effect of strain rate under tensile load on microcrack growth in Alpha Titanium, molecular dynamics simulation was used to analyze the results of atomic location, dislocation distribution, lattice phase transition, potential energy distribution and volume strain distribution. It was found that the cracks gradually evolved into holes after unstable propagation, and the holes were occupied by clusters on both sides of the material in the later stage under the necking of the material. The higher the tensile strain rate, the earlier the crack initiation and the larger the evolution of the through-hole. When the same strain value is reached, the lattice transformation ratio is higher under high strain rate loading. HCP is transformed into amorphous structure, BCC lattice type and a small amount of FCC type. Moreover, the larger the strain rate, the less the compatible deformation ability of the lattice is, and the more twins are produced. In addition, it is found that there are volumetric strain wave emission and diffusion in the model at the moment of void birth, and voids play a role in dividing the energy absorption region. Dislocation emission occurs at the crack tip and energy competition exists between dislocation and crack propagation
Fast Lithium Ion Diffusion in Brownmillerite
Ionic conductors have great potential for interesting tunable physical
properties via ionic liquid gating and novel energy storage applications such
as all-solid-state lithium batteries. In particular, low migration barriers and
high hopping attempt frequency are the keys to achieve fast ion diffusion in
solids. Taking advantage of the oxygen-vacancy channel in
, we show that migration
barriers of lithium ion are as small as 0.28~0.17eV depending on the lithium
concentration rates. Our first-principles calculation also investigated hopping
attempt frequency and concluded the room temperature ionic diffusivity and ion
conductivity is high as and
respectively, which
outperform most of perovskite-type, garnet-type and sulfide Li-ion solid-state
electrolytes. This work proves
as a promising solid-state
electrolyte.Comment: 6 pages, 7 figure
Research on a Model of Extracting Persons\u27 Information Based on Statistic Method and Conceptual Knowledge
PACLIC 21 / Seoul National University, Seoul, Korea / November 1-3, 200
Facing Unknown: Open-World Encrypted Traffic Classification Based on Contrastive Pre-Training
Traditional Encrypted Traffic Classification (ETC) methods face a significant
challenge in classifying large volumes of encrypted traffic in the open-world
assumption, i.e., simultaneously classifying the known applications and
detecting unknown applications. We propose a novel Open-World Contrastive
Pre-training (OWCP) framework for this. OWCP performs contrastive pre-training
to obtain a robust feature representation. Based on this, we determine the
spherical mapping space to find the marginal flows for each known class, which
are used to train GANs to synthesize new flows similar to the known parts but
do not belong to any class. These synthetic flows are assigned to Softmax's
unknown node to modify the classifier, effectively enhancing sensitivity
towards known flows and significantly suppressing unknown ones. Extensive
experiments on three datasets show that OWCP significantly outperforms existing
ETC and generic open-world classification methods. Furthermore, we conduct
comprehensive ablation studies and sensitivity analyses to validate each
integral component of OWCP.Comment: Accepted by 2023 IEEE ISCC, 6 pages, 5 figure
Numerical simulation analysis of large eddy simulation for T-tube based on solid-liquid two-phase abrasive flow
As a kind of nano machining technology, abrasive flow polishing technology plays an important role in precision machining region. As an important numerical simulation method in fluid mechanics, large eddy numerical simulation method has become an important method for many scholars to study abrasive grain polishing technology. In this paper, the use of fluid mechanics software FLUENT and selected Mixture mixed model. Based on the theory of solid-liquid two-phase flow dynamics, the large-eddy numerical simulation method was used to study the polishing process of T-tube abrasive flow, and the micro-machining mechanism of abrasive-polished workpiece was discussed. The influence of the different inlet velocities on the polishing effect of the abrasive grains was discussed by analyzing the numerical simulation results of the different inlet velocities of the abrasive grains during the processing of the T-tube
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