3,406 research outputs found
Why a local moment induces an antiferromagnetic ordering: An RVB picture
Based on a Gutzwiller projected BCS wavefunction, it is shown that a local
S=1/2 moment is present around a vacancy site (zinc impurity) in a form of
staggered magnetic moments, which is a direct consequence of the short-ranged
resonating-valence-bond (RVB) pairing in the spin background.Comment: 4 pages, 3 figure
3-(2-AminoÂethyl)-2-anilinoquinazolin-4(3H)-one methanol hemisolvate
The title methanol hemisolvated quinazolin-(3H)-one, C16H16N4O·0.5CH3OH, has an anilino substituent in the 2-position and an aminoÂethyl substituent in the 3-position of the planar fused-ring system (r.m.s. deviation = 0.019 Å). The anilino N atom donates an intramolecular hydrogen bond to the aminoÂethyl N atom. The molÂecule and the solvent methanol molÂecule are linked by N—Hâ‹ŻN, N—Hâ‹ŻO and O—Hâ‹ŻO hydrogen bonds. The methanol molÂecule is disordered over two equally occupied positions about a twofold rotation axis
A new class of fractional impulsive differential hemivariational inequalities with an application
We consider a new fractional impulsive differential hemivariational inequality, which captures the required characteristics of both the hemivariational inequality and the fractional impulsive differential equation within the same framework. By utilizing a surjectivity theorem and a fixed point theorem we establish an existence and uniqueness theorem for such a problem. Moreover, we investigate the perturbation problem of the fractional impulsive differential hemivariational inequality to prove a convergence result, which describes the stability of the solution in relation to perturbation data. Finally, our main results are applied to obtain some new results for a frictional contact problem with the surface traction driven by the fractional impulsive differential equation
catena-Poly[[silver(I)-ÎĽ-[N-(4-pyridylÂmethÂyl)pyridine-4-carboxamide-Îş2 N:N′]] nitrate monohydrate]
The title coordination polymer, {[Ag(C12H11N3O)]NO3·H2O}n, has a polycationic chain motif in which the Ag atom is bridged by the heterocyclic ligand; the Ag atom shows linear coordination. If the two long Agâ‹ŻOnitrate interÂactions [2.794 (6) and 2.867 (5) Å] are regarded as bonds, the compound adopts a three-dimensional network structure. The water molÂecule consolidates the network structure by forming hydrogen bonds, one to the polycationic chain and one to the nitrate anion
Security and Privacy on Generative Data in AIGC: A Survey
The advent of artificial intelligence-generated content (AIGC) represents a
pivotal moment in the evolution of information technology. With AIGC, it can be
effortless to generate high-quality data that is challenging for the public to
distinguish. Nevertheless, the proliferation of generative data across
cyberspace brings security and privacy issues, including privacy leakages of
individuals and media forgery for fraudulent purposes. Consequently, both
academia and industry begin to emphasize the trustworthiness of generative
data, successively providing a series of countermeasures for security and
privacy. In this survey, we systematically review the security and privacy on
generative data in AIGC, particularly for the first time analyzing them from
the perspective of information security properties. Specifically, we reveal the
successful experiences of state-of-the-art countermeasures in terms of the
foundational properties of privacy, controllability, authenticity, and
compliance, respectively. Finally, we summarize the open challenges and
potential exploration directions from each of theses properties
- …