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We study the problem of approximating the partition function of the ferromagnetic Ising model in graphs and hypergraphs. Our first result is a deterministic approximation scheme (an FPTAS) for the partition function in bounded degree graphs that is valid over the entire range of parameters β (the interaction) and λ (the external field), except for the case |λ|=1 (the...
This article describes a method for recognizing Ukrainian car's license plates of the most common format, which has a high percentage of correct recognition and applied in practice.
The existing constructions of Golay complementary sets based on generalized Boolean functions are limited to lengths, which are powers of two. In a recent paper, Chen [3] proposed a new construction of binary and nonbinary complementary sets of non-power-of-two length based on truncated method. In this paper, we proposed a novel construction of ç-ary complementary sets based on the concatenation of...
Parametric downconversion (PDC) allows the generation of highly coherent, spectrally pure single photons for quantum photonics. In a typical heralded PDC source, the signal photon emerges in a spectrally mixed state due to strong (anti)correlation in the joint spectrum of PDC photon pairs.
Squeezed states of light are referred to as non-classical field states and are known to be characterized by strong correlations between photons both in the spectral and spatial domain. For these reasons they are very perspective for many important and interesting practical applications in modern quantum optics including storage and transfer of quantum information. From this point of view multiphoton...
Elementary school students experience significant personal changes; their bodies change, as well as their inner selves. Their emotional status can be affected by both intrinsic and extrinsic factors; therefore, it is vital to highlight the emotional factors that influence the learning process, as a negative emotional status may lead to reduced motivation and low school performance, whereas a positive...
Pure and deterministic single-photon sources, obtained by coupling a semiconductor quantum dot (QD) to a photonic crystal (PhC) cavity, constitute a key component for quantum photonic integrated circuits (QPICs) [1]. These sources are commonly excited by a laser pump, which involves some practical limitations in scaling the number of integrated cavity-emitter nodes and is hardly compatible with on-chip...
Motion detection typically is the case for applications using a fixed camera such as video surveillance applications or traffic monitoring applications. This research directed to detect a movement within a single scene and build a new background based on the correlation method. The recorded footages scenes (vehicle and human) were outdoor at different day times using a fixed camera. The suggested...
Measurements of two- and multi-particle angular correlations in pp collisions at s=5,7, and 13TeV are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0pb−1 (5 TeV), 6.2pb−1 (7 TeV), and 0.7pb−1 (13 TeV), were collected using the CMS detector at the LHC. The second-order (v2) and third-order (v3) azimuthal anisotropy harmonics of unidentified...
Measurements of two-particle angular correlations in pp collisions at s=7 TeV are presented as a function of charged-particle multiplicities. The data, corresponding to an integrated luminosity of about 6.2 pb−1, were collected during the 2010 LHC pp run using the CMS detector. In high-multiplicity events, a long-range (|Δη|>2), near-side (Δϕ≈0) structure is found in the two-particle Δη−Δϕ correlation...
While the data mining in education field gained more and more popularity in recent years, there have many research endeavors to find association rules in students' academic situation. The current methods normally apply traditional association rules mining technique to identify those rules. However, traditional association rules mining technique can not identify difference between different types of...
The Leontovich definition of the free energy of a non-equilibrium system is discussed. In this approach it is assumed that system has a define temperature and is described by some set parameters (these parameters and the temperature are parameters of the reduced description of the system). It is shown that the Leontovich non-equilibrium free energy is obtained from an equilibrium free energy by a...
Respiratory gating is a powerful tool for tackling motion-related issues in chest PET imaging. On current scanners the respiratory signal is obtained from external devices, whereas with Data-Driven methods it can be extracted directly from the data. The aim of this work is to show the increased potential of the application of Principal Component Analysis (PCA) on TOF data. We propose a methodology...
Sparse reconstruction algorithms aim to retrieve high-dimensional sparse signals from a limited number of measurements. A common example is LASSO or Basis Pursuit where sparsity is enforced using an ℓ1-penalty together with a cost function ‖y — Hx‖22. For random design matrices H, a sharp phase transition boundary separates the ‘good’ parameter region where error-free recovery of a sufficiently sparse...
Photonic crystals are versatile architecture for controlling photonic properties. In the history, photonic crystals are used to design low-dimensional photonic structures such as cavities and waveguides using photonic band gaps [1, 2]. They are exploited for engineering photonic dispersions for control light flow, such as negative refraction and super-prism [2]. Beside these applications based on...
In this talk, we will discuss our recent progress on second-order correlation weak-value measurements. By extending the conventional weak-value measurements to second-order correlation function, in one experiment, we have post-selected a nonlinear observable to improve the sensitivity of EIT-based magnetometry in an atomic vapor cell by few orders of magnitude in comparison to previous reports. In...
Respiratory motion correction in PET imaging is of crucial importance in the thorax. On current scanners, respiratory gating is performed based on the signal of an external device. Recent methods extract a respiratory signal from raw PET data exploiting data driven (DD) methods, avoiding the use of external equipment and having potential increased fidelity to internal motion. However, many of these...
The prediction of both, vehicular traffic and communication connectivity are important research topics. In this paper, we propose the usage of innovative machine learning approaches for these objectives. For this purpose, Poisson Dependency Networks (PDNs) are introduced to enhance the prediction quality of vehicular traffic flows. The machine learning model is fitted based on empirical vehicular...
We monitor the terahertz fingerprints of electronic and structural orders of the charge density wave in 1T-TiSe2 on the femtosecond scale. NIR photoexcitation selectively melts electronic ordering while the structural distortion persists in a coherently excited state.
Terahertz control of semiconductor excitations is analyzed theoretically in a double-quantum-well by theoretical modeling. The results demonstrate that selective transport of electrons, excitons and even pure correlations is realizable in present-day experiments.
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