We show that defocusing Kerr media with parity-time-symmetric potentials can support one- and two-dimensional bright spatial solitons. These solitons are found to be stable over the wide range where they exist. More importantly, we discover an exact one-dimensional solution a closed in structure.

With the prosperity of Internet Things (IoT) industry environment, variety and quantity IoT devices have grown rapidly. been widely used in smart homes, wear, manufacturing, cars, medical care, many other life-related fields. it, security vulnerabilities are emerging endlessly. The proliferation will bring severe risks to users’ privacy property. This paper first describes research background, including architecture, device components, attack surfaces. We review state-of-the-art on...

We numerically study the gray solitons in parity-time (PT) symmetric potentials. Simulated results show that there are two kinds of solitons, dip-shaped and hump-shaped both them can be stable. Hump-shaped always exist, but grayness a stable soliton should exceed threshold value. More interesting, it is discovered when propagating PT potentials, have no transverse deviation, this phenomenon different from usual solitons.

Machine learning algorithms are widely used for cybersecurity applications, include spam, malware detection. In these the machine model has to face attack by adversarial samples. Therefore, how train a robust with small samples is very hot research problem. portable document format (PDF) file format, and often utilized as vehicle malicious behavior. There have been various PDF detectors based on learning. However, labeling of large-scale data time-consuming laborious. This paper aims reduce...

Gels comprised of dynamic bonds are important candidates for the emerging 'intelligent' gels due to their unique characteristics. We report a universal law hierarchical gel dynamics arising from association-dissociation physical crosslinks, as discerned light scattering (DLS) on diverse sets complex gels. It is first experimental evidence stretched exponential decay with exponent 1/3 in DLS all gels, complementing more than five decades studies conventional chemical Here we show that...

Generation of wave structures by a two-dimensional (2D) object (laser beam) moving in 2D two-component Bose-Einstein condensate with velocity greater than the two sound velocities mixture is studied means analytical methods and systematic simulations coupled Gross-Pitaevskii equations. The pattern features three regions separated Mach cones. Two branches linear patterns similar to so-called ``ship waves'' are located outside corresponding cones, oblique dark solitons found inside wider cone....

Deep neural network (DNN) is applied widely in many applications and achieves state-of-the-art performance. However, DNN lacks transparency interpretability for users structure. Attackers can use this feature to embed trojan horses the structure, such as inserting a backdoor into DNN, so that learn both normal main task additional malicious tasks at same time. Besides, relies on data set training. tamper with training interfere process, attaching trigger input data. Because of defects...

We numerically study the nonlocal gap solitons in parity-time (PT) symmetric optical lattices built into a self-focusing medium. state existence, stability, and propagation dynamics of such PT detail. Simulated results show that there exist stable soltions. The influences degree nonlocality on soliton power, energy flow density region are also examined.

Light-driven polymerization, such as photoinduced electron/energy transfer–reversible addition–fragmentation chain transfer (PET-RAFT) enables biological benign conditions and versatile functional polymer structure design, which is readily used in protein–polymer bioconjugates. However, conventional metalloporphyrinic homogeneous catalysts for PET-RAFT polymerization suffer from limited aqueous solubility tedious purification. Here we demonstrate the design of photocatalyst reticular...

Cross-project defect prediction is a hot topic in the field of prediction. How to reduce difference between projects and make model have better accuracy core problem. This paper starts from two perspectives: feature selection distance-weight instance transfer. We differences perspective engineering introduce transfer learning technology construct cross-project WCM-WTrA multi-source Multi-WCM-WTrA. tested on AEEEM ReLink datasets, results show that our method has an average improvement 23%...

We investigate numerically the interaction between two finite Airy-Gaussian (AiG) beams in different media with defected photonic lattices one transverse dimension. discuss that intensities and phases launch into lattice structures but accelerate opposite directions. During interactions, interference fringe, breathers, soliton pairs are observed. In linear media, initial deflection direction of accelerated is changed by adjusting phase shift beam interval. For a certain period, periodic...

A supramolecule photosensitizer (supra-photosensitizer) based on the host-guest complexation of cyclodextrins and a bis-chalcone dye (BDEA) was prepared. Methyl-β-cyclodextrin (Me-β-CD), with highest inclusion rate, confirmed as best host among four cyclodextrins. The properties Me-β-CD BDEA were characterized by FTIR, XRD, 1H NMR, PLQY, SEM, Job's plot, Benesi-Hildebrand others. Compared to conventional photosensitizers, supra-photosensitizers showed higher fluorescence emission longer...

We consider the manipulation of Bose-Einstein condensate vortices by optical potentials generated focused laser beams. It is shown that for appropriate choices strength and width it possible to successfully transport various positions inside trap confining atoms. Furthermore, full bifurcation structure stationary single-charge vortex solutions in a harmonic potential with this type impurity elucidated. The case when moving captured beam also studied, as well possibility dragging means...

We investigate the properties of gap solitons in spin–orbit-coupled Bose–Einstein condensates mixed linear–nonlinear optical lattices. The lattices can support parity-time (PT)-symmetric soliton solutions, and these PT-symmetric stably exist semi-infinite linear gap-stripe are found by increasing strength spin–orbit coupling. It is that amplitude nonlinear significantly affect stability solitons. With an increase lattices, stable domains shrunk. unstable show unique evolution characteristics...

The bright spatial solitons in nonlocal defocusing Kerr media with parity-time () symmetric potentials are studied. influence of the degree nonlocality on and transverse energy flow within stable examined. We also find that these can exist be over a different range propagation constant potential parameters. Interestingly, there exists threshold value for or

We demonstrate that in-bulk vortex localized modes, and their surface half-vortex ("horseshoe") counterparts self-trap in two-dimensional (2D) nonlinear optical systems with $\mathcal{PT}$-symmetric photonic lattices (PLs). The respective stability regions are identified the underlying parameter space. states related to truncated Bloch waves gaps of PL-induced spectrum. basic horseshoe modes built, severally, four three beams appropriate phase shifts between them. Their stable complex...

The structured light projection (SLP) method occupies a crucial position in three-dimensional (3D) imaging technology. Different working wavelengths of can be employed depending on the situation. However, there are few lights that modulated based wavelength at present. Therefore, we have comprehensively investigated and designed Dammann grating (DG) metasurface, which controlled through multi-beam interference (MBI) to achieve change wavelength. In this work, convert straight waveguide...

The experimental results show that there are two growth modes of crystalline metal oxide in the colloidal crystal template, which depend on quality crystal. In well-ordered templates, follows structure crystal; and high three-dimensional ordered macroporous (3DOM) Cu2O or ZnO formed. contrast, less-ordered is grown according to its own capital structure, cubic-shaped sheetlike Our method provides an easy convenient way prepare materials shaped via adjusting level arrangement templates.

We propose a method for generation of tunable three-dimensional (3D) helical lattices with varying helix pitch. In order to change only the lattice pitch, periodically phase along propagation direction is added central beam - one interference beams construction. The periodicity determines which can be reconfigured at ease. Furthermore, structure an interface (domain wall) also achieved by changing lateral beams, leading opposite rotating (helicity) on different sides interface. When Gaussian...