Conventional attacks of insider employees and emerging APT are both major threats for the organizational information system. Existing detections mainly concentrate on users' behavior usually analyze logs recording their operations in an In general, most these methods consider sequential relationship among log entries model behavior. However, they ignore other relationships, inevitably leading to unsatisfactory performance various attack scenarios. We propose log2vec, a heterogeneous graph...

The naturally persistent flow of hundreds dust particles is experimentally achieved in a dusty plasma system with the asymmetric sawteeth gears on electrode. It also demonstrated that direction particle can be controlled by changing conditions gas pressure or power. Numerical simulations ion drag inside verify experimental observations rectification particles. Both experiments and suggest potential collective effect are two keys this ratchet. With nonequilibrium drag, along orientation...

We report the observation of a square superlattice pattern in dielectric barrier discharge system. The correlation measurements indicate that is an interleaving two different transient sublattices. interplay between charge and filament discussed.

Utilizing the principle of Feynman ratchet, it is possible to rectify random motion into directed flow particles under a nonequilibrium environment. In this paper, an experimental setup for dusty plasma metal straight ratchet designed create asymmetric environment along channel, enabling controllable rectification micron-sized dust particles. Monodispersed can form directional in and transport direction could be precisely controlled by adjusting discharge power gas pressure. Research on...

Understanding of the effect coupling interaction is at heart nonlinear science since some nonequilibrium systems are composed different layers or units. In this paper, we demonstrate various spatio-temporal patterns in a nonlinearly coupled two-layer Turing system with nonidentical reaction kinetics. Both type mode and form play an important role pattern formation selection. Two kinds interactions, namely supercritical-subcritical supercritical-supercritical interaction, have been...

Abstract The Feynman ratchet has the ability to convert random fluctuations into directional particle transport. transport velocity of particles is highly dependent on their size, leading and subsequent separation under suitable parameter conditions. Here, exploiting distinct responses with different sizes system, bi-dispersed dust achieved experimentally in air at 35 Pa using a dusty plasma ratchet. To reveal underlying mechanism, we construct model perform Langevin simulations for...

A rich variety of spiral patterns such as single-armed spiral, dipole spirals, target pattern, multiarmed and defect chaos state have been observed in ac-driven atmospheric pressure gas discharge. The confined free boundary conditions are defined by means whether there is a sidewall the discharge domain or not, respectively. In condition, pattern arises when stripe undergoes core instability notching instability. formed forcing. drifts upward condition meanders condition. topological charge...

In this paper, a computational simulation of the sheath formation during streamer-surface interaction at atmospheric pressure is presented. A two-dimensional fluid model point-to-plane configuration applied to investigate evolution discharge in vicinity cathode plane. The effects surfaces on properties streamer have been studied for three cases, i.e., conductive surface with secondary electron emission (SEE), without SEE, and dielectric surface. all we found that axial propagation velocity...

Abstract The rate-integrating gyroscope (RIG) operation is considered as the next generation architecture for hemispherical resonator gyroscopes (HRGs) with advantages of direct angle measurement and unlimited dynamic range. However, this RIG requires high symmetry HRG device damping mismatch two gyroscopic modes will result in a dead area problem. This work analyzes error mechanism asymmetry induced proposed novel virtual procession compensation method RIG. simulation proves existence...

Abstract We demonstrate an effective method for realization of robust, tailorable annular plasma photonic crystals (PPC) in dielectric barrier discharge with two water electrodes. Fast reconfiguration between triangular lattice, core-annular lattice and concentric-annular has been achieved. An active control on the structure elements is realized by solely changing applied voltage. The changes band gaps different PPCs have studied both experimentally numerically. 28.0–30.0 GHz are verified. A...

Abstract The microscopic dynamics and formation mechanism of Trichel pulse discharge are investigated. A nonequal current transient effect exists in the discharge. By reducing limiting resistance, simulated waveforms qualitatively quantitatively consistent with those experiment. dominant positive ions vary at different stages, which originate from evolution reactions for generation consumption charged particles. existence negative layers results attenuation electric field rising edge pulse....

A rich variety of gas-discharge patterns have been observed in a specially designed dielectric-barrier discharge system with two liquid electrodes. The presented here include square-lattice pattern, square-texture square-superlattice hexagonal superlattice state, multiarmed-spiral hollow-hexagonal and rotating-wheels pattern.

Federated learning is a secure machine technology proposed to protect data privacy and security in model training. However, recent studies show that federated vulnerable backdoor attacks, such as replacement attacks distributed attacks. Most defense techniques are not appropriate for since they based on entire samples cannot be hold scenarios. The newly methods sacrifice the accuracy of models still fail once persist many training rounds. In this paper, we propose novel effective detection...

Rotation manipulation in the fields of metamaterials and metasurfaces has led to a variety striking properties. Here, we propose an efficient scheme for realizing rotation-controllable plasma dielectric barrier discharge. Rotating triangular photonic crystals (RTPPCs) are obtained by self-organization filaments simply ambient air. Independent control angular velocity lattice constant RTPPCs is realized. A phenomenological reaction–diffusion model with two coupled layers established reveal...

In this paper, a computational study of two counter-propagating helium plasma jets in ambient air is presented. A two-dimensional fluid model applied to investigate the physical processes interaction (PJI) driven by equal and unequal voltages, respectively. all studied cases, PJI results decrease both bullets propagation velocity. When are they never merge but rather approach each other around middle gas gap at minimum distance, minimal distance decreases with increase voltages initial...

Abstract As Moore’s law deteriorates, the research and development of new materials system are crucial for transitioning into post Moore era. Traditional semiconductor materials, such as silicon, have served cornerstone modern technologies over half a century. This has been due to extensive engineering on techniques continuously enrich silicon-based and, subsequently, develop better performed devices. Meanwhile, in emerging era, layered transition metal dichalcogenides (TMDs), garnered...

Self-organized stationary patterns in dielectric barrier discharges operating glow regime at atmospheric pressure are investigated by a self-consistent two-dimensional fluid model. The simulation results show that two different modes, namely, the diffuse mode and static patterned mode, can be formed ranges of driving frequency. discharge operates Townsend while it inside filaments outside stable pattered mode. forming process divided into three stages, destabilizing stage, self-assembling...

Malicious login, especially lateral movement, has been a primary and costly threat for enterprises. However, there exist two critical challenges in the existing methods. Specifically, they heavily rely on limited number of predefined rules features. When attack patterns change, security experts must manually design new ones. Besides, cannot explore attributes' mutual effect specific to login operations. We propose MLTracer, graph neural network (GNN) based system detecting such attacks. It...

Lieb lattice has been proven to host various extraordinary properties due its unique Dirac-flat band structure. However, the realization of tunable lattices with controllable configurations still remains a significant challenge. We demonstrate first robust and tailorable plasma in dielectric barrier discharges by use uniquely designed mesh-water electrodes. Fast reconfiguration between square lattice, superlattices achieved wide range discharge parameters even ambient air. Active control...

Abstract In this paper, an extended three-dimensional (3D) model of the Yellow River Estuary (YRE) is established. It based on a Delft 3D shallow-water high-resolution hydrodynamic model. The calibrated and verified by field observation data, which ensures its stability accuracy, provides better simulation river plume in estuary under different flow inputs. Since 2009, spring pulse can be divided into four types. strong more conducive to extension low salinity zone (LSZ). Doubling peak...

Radial structures of atmospheric pressure glow discharges in dielectric barrier discharge with multiple current pulses are investigated by a self-consistent two-dimensional fluid model. The simulation results show that the densities at different radial positions do not reach their peaks simultaneously, indicating there exists non-uniform structure. time delay between plasma ignitions become larger and successive pulses. It is argued non-uniformity originates from edge effects first pulse,...

Abstract Dust particles are often electrostatically trapped and levitated within the non-electroneutral region of a sheath. The fascinating transport phenomena dust strongly depend on plasma parameters surrounding them sheath, whereas, that quite difficult to obtain, leading an unclear understanding particle mechanisms. Here, we demonstrate tunable horizontal micron-sized by precisely manipulating their vertically suspended heights in asymmetric ratchet sheath designing dusty ratchet. A...