A compact form of a cubic equation from the 7-point algorithm

One of the popular approaches to estimate the fundamental matrix of a stereo pair is a 7-point algorithm. One of the key elements of the algorithm is a solution of a cubic equation. This paper provides a compact representation of the equation, helping researchers to implement less error-prone computer vision software faster

Plausible rectification from the fundamental matrix

Rectification of a stereo pair from the fundamental matrix (also known as uncalibrated rectification [1]) is a procedure that results in a new pair of images that have strictly horizontal epipolar lines. Moreover, the corresponding epipolar lines of the two images acquire the same vertical position. This means that the vertical disparity between corresponding pixels becomes small enough (e.g. zero, if we speak about integer pixel coordinates), and efficient stereo matching algorithms can be applied further. This article presents a plausible algorithm to achieve this. The plausibility consists in the fact that the algorithm works not for all cases, and these cases are studied in detail in this paper. However, authors claim that the presented algorithm deserves attention because of implementation and explanation simplicity

Activities at Kyzylkala Settlement in 2021 and Preliminary Analysis of Ceramic Material

The paper highlights the results of studies conducted at Kyzylkala settlement in the Mangystau region of the Republic of Kazakhstan in 2021. The results of the primary analysis of ceramics obtained during the excavation of the monument are presented. The complex was subdivided into three technological groups, and the categories and types of vessels are briefly described. An analysis of these materials demonstrated their proximity to the pottery complex of Samosdelskoye settlement located in Astrakhan Oblast. Ceramics of group 2 find analogies in the collection from the excavations of Derbent. The main types of glazed ceramics are connected by their origin with the territory of Transcaucasia. Their dating makes it possible to clarify the dating of the monument, which has been determined as the 11th– 13th centuries

The formation of human populations in South and Central Asia

By sequencing 523 ancient humans, we show that the primary source of ancestry in modern South Asians is a prehistoric genetic gradient between people related to early hunter-gatherers of Iran and Southeast Asia. After the Indus Valley Civilization’s decline, its people mixed with individuals in the southeast to form one of the two main ancestral populations of South Asia, whose direct descendants live in southern India. Simultaneously, they mixed with descendants of Steppe pastoralists who, starting around 4000 years ago, spread via Central Asia to form the other main ancestral population. The Steppe ancestry in South Asia has the same profile as that in Bronze Age Eastern Europe, tracking a movement of people that affected both regions and that likely spread the distinctive features shared between Indo-Iranian and Balto-Slavic languages

EPR of Yb 3+ ions in a monoclinic KY(WO 4) 2 single crystal

The electron paramagnetic resonance (EPR) of Yb 3+ ions in a KY(WO 4) 2 single crystal was investigated at T=4.2 K and fixed frequency of 9.38 GHz. The resonance absorption observed on the lowest Kramers doublet represents the complex superposition of three spectra, corresponding to the ytterbium isotopes with different nuclear moments. The EPR spectrum is characterized by a strong anisotropy of the g-factors. The temperature dependence of the g-factors is shown to be caused by the strong spin-orbital and orbital-lattice coupling. The resonance lines broaden with increasing temperature due to the short spin-lattice relaxation times. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 200775.30.Gw Magnetic anisotropy, 76.30.-v Electron paramagnetic resonance and relaxation,

Benefits of Printed Graphene with Variable Resistance for Flexible and Ecological 5G Band Antennas

The possibility of creating antennas of the 5G standard (5.2–5.9 GHz) with specified electrodynamic characteristics by printing layers of variable thickness using a graphene suspension has been substantiated experimentally and by computer simulation. A graphene suspension for screen printing on photographic paper and other flexible substrates was prepared by means of exfoliation from graphite. The relation between the graphene layer thickness and its sheet resistance was studied with the aim of determining the required thickness of the antenna conductive layer. To create a two-sided dipole, a technology has been developed for the double-sided deposition of graphene layers on photographic paper. The electrodynamic characteristics of graphene and copper antennas of identical design are compared. The antenna design corresponds to the operating frequency of 2.4 GHz. It was found that the use of graphene as a conductive layer made it possible to suppress the fundamental (first) harmonic (2.45 GHz) and to observe radiation at the second harmonic (5.75 GHz). This effect is assumed to observe in the case when the thickness of graphene is lower than that of the skin depth. The result indicates the possibility of changing the antenna electrodynamic characteristics by adjusting the graphene layer thickness