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2021 ◽  
Vol 08 (04) ◽  
pp. 78-81
Author(s):  
Gulnara Feyziyeva Gulnara Feyziyeva

Over the past 20 years, 3D (three-dimensional) technology has become widespread as an advanced method for creating digital models of objects. This direction of science is used not only in the technical and space fields, but in the storage and protection of pharmaceuticals, museum exhibits and other cultural values in the form of digital data. Currently, the method based on laser scanning is of particular importance for obtaining accurate images among wide-sector methods for constructing digital models of objects. Although the limited application of the method is associated with financial and economic problems, the accuracy of data, the creation of artificial objects, characters using various editors and programs, their animation, as well as harmony with real objects and interiors have become key factors in the spread of this technology. The article analyzes the process of obtaining a three-dimensional image of a model using two cameras using three-dimensional graphics editors. Keywords: 3D technology, digital model, graphic representation, Monge method, modeling.


2021 ◽  
Vol 23 (4) ◽  
pp. 48-55
Author(s):  
Yuri G. Pasternak ◽  
Evgeny A. Rogozin ◽  
Ruslan E. Rogozin ◽  
Sergei M. Fedorov

Cylindrical Lunebeg lenses allow azimuthal scanning in a wide sector of angles. The article discusses a cylindrical Luneberg lens with an out-of-focus parallel printed circuit boards made of thin fiberglass (FR-4) with an etched H-shaped metamaterial structure. The distribution of the electric field in the azimuthal plane is shown when a linearly polarized plane wave is incident on the lens surface parallel to the printed circuit boards. The dependence of the focal length on the frequency is shown. Conclusions are drawn about the effect of dispersion on the focal length. To clarify the value of the focal length, thedirectional characteristics of the antenna system are considered when the focal length is changed. Directional characteristics are investigated when the feed is rotated in the azimuthal plane. The results presented in the article are planned to be used to create broadband Luneberg lenses from metamaterials.


2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Stuart K. Gardiner ◽  
Steven L. Mansberger

Abstract Detecting rapid visual field deterioration is crucial for individuals with glaucoma. Cluster trend analysis detects visual field deterioration with higher sensitivity than global analyses by using predefined non-overlapping subsets of visual field locations. However, it may miss small defects that straddle cluster borders. This study introduces a comprehensive set of overlapping clusters, and assesses whether this further improves progression detection. Clusters were defined as locations from where ganglion cell axons enter the optic nerve head within a θ° wide sector, centered at 1º intervals, for various θ. Deterioration in eyes with or at risk of glaucomatous visual field loss was “detected” if ≥ Nθ clusters had deteriorated with p < pCluster, chosen empirically to give 95% specificity based on permuting the series. Nθ was chosen to minimize the time to detect subsequently-confirmed deterioration in ≥ 1/3rd of eyes. Times to detect deterioration were compared using Cox survival models. Biannual series were available for 422 eyes of 214 participants. Predefined non-overlapping clusters detected subsequently-confirmed change in ≥ 1/3rd of eyes in 3.41 years (95% confidence interval 2.75–5.48 years). After equalizing specificity, no criteria based on comprehensive overlapping clusters detected deterioration significantly sooner. The quickest was 3.13 years (2.69–4.65) for θ° = 20° and Nθ = 25, but the comparison with non-overlapping clusters had p = 0.672. Any improvement in sensitivity for detecting deterioration when using a comprehensive set of overlapping clusters was negated by the need to maintain equal specificity. The existing cluster trend analysis using predefined non-overlapping clusters provides a useful tool for monitoring visual field progression.


2020 ◽  
Vol 20 (3) ◽  
pp. 5-19
Author(s):  
N.I. Voytovich ◽  
◽  
A.V. Ershov ◽  
B.V. Zhdanov ◽  
E. M. Iungaitis ◽  
...  

The article is devoted to the problem of information protection generated by a glide path beacon of the PRMG format for providing instrumental approach of aircraft for landing. To en-sure a safe approach, the radio beacon landing system forms a descent trajectory in space - a glide path. A developed multilevel control system is designed to ensure the integrity of the land-ing system by continuous monitoring of the position of a given glide path and the steepness of the indicated glide path parameter. However, during flight tests of a glide path beacon (GPB), a false glide path is sometimes detected in the area of the landing system, which naturally vio-lates its integrity. The article shows the reason for this phenomenon - a violation of the multi-plicity of the heights of the suspension of the radiating elements of the GPB antenna array. Flight measurements data of the glide path zone at the airfield in the foothills are given. The experimental results confirm the theoretically found regularities in the behavior of the informa-tion parameter of the glide path beacon in a wide sector of angles. Recommendations are pro-posed for maintaining the integrity of the landing system


2017 ◽  
Vol 8 (1) ◽  
pp. 101-112 ◽  
Author(s):  
Wawmayura Chamsuk ◽  
Wanno Fongsuwan ◽  
Josu Takala

Abstract A structural equation model was used to verify both the direct and indirect influences on research and development and innovation capabilities that affect Thai automotive parts enterprises competitive advantage. Thailand’s automotive sector is a major driver of the economy with a multi-thousand network of both domestic and international companies contributing a significant amount to both domestic and Asian economic growth. After peaking in 2013 and reaching the Top 10 automotive nations, there has been a slide backwards. Competition is fierce and the pace of change ever quickening. Therefore, the researchers sought to determine how the automotive parts sector needed to improve in capability, skills and infrastructure to maintain a sustainable competitive advantage. From the structural equation model analysis of 220 regional automotive parts sector managers and use of AMOS software, it was determined that research and development combined with innovation plays key roles in the industry’s profitability and survivability. Additionally, there must be support across a wide sector of the economy, including universities, government agencies and institutions. Once championed as the ‘Detroit of Asia’, Thailand’s recognized success as a global automotive hub is a classic case of a well-executed industrial plan but that lead can potentially slip away without embracing new technologies and innovative thinking.


2017 ◽  
Vol 68 (1) ◽  
pp. 6-18 ◽  
Author(s):  
Bernardino Gentili ◽  
Gilberto Pambianchi ◽  
Domenico Aringoli ◽  
Marco Materazzi ◽  
Marco Giacopetti

Abstract This work is a significant contribution to knowledge of the Quaternary and pre-Quaternary morphogenesis of a wide sector of central Italy, from the Apennine chain to the Adriatic Sea. The goal is achieved through a careful analysis and interpretation of stratigraphic and tectonic data relating to marine and continental sediments and, mostly, through the study of relict limbs of ancient landscapes (erosional surfaces shaped by prevailing planation processes). The most important scientific datum is the definition of the time span in which the modelling of the oldest morphological element (the “summit relict surface”) occurred: it started during Messinian in the westernmost portion and after a significant phase during middle-late Pliocene, ended in the early Pleistocene. During the middle and late Pleistocene, the rapid tectonic uplift of the area and the climate fluctuations favoured the deepening of the hydrographic network and the genesis of three orders of fluvial terraces, thus completing the fundamental features of the landscape. The subsequent Holocene evolution reshaped the minor elements, but not the basic ones.


2015 ◽  
Vol 28 (18) ◽  
pp. 7385-7406 ◽  
Author(s):  
David K. Hutchinson ◽  
Matthew H. England ◽  
Andrew M. Hogg ◽  
Kate Snow

Abstract Climate model projections and observations show a faster rate of warming in the Northern Hemisphere (NH) than the Southern Hemisphere (SH). This asymmetry is partly due to faster rates of warming over the land than the ocean, and partly due to the ocean circulation redistributing heat toward the NH. This study examines the interhemispheric warming asymmetry in an intermediate complexity coupled climate model with eddy-permitting (0.25°) ocean resolution, and results are compared with a similar model with coarse (1°) ocean resolution. The models use a pole-to-pole 60° wide sector domain in the ocean and a 120° wide sector in the atmosphere, with Atlantic-like bathymetry and a simple land model. There is a larger high-latitude ocean temperature asymmetry in the 0.25° model compared with the 1° model, both in equilibrated control runs and in response to greenhouse warming. The larger warming asymmetry is caused by greater melting of NH sea ice in the 0.25° model, associated with faster, less viscous boundary currents transporting heat northward. The SH sea ice and heat transport response is relatively insensitive to the resolution change, since the eddy heat transport differences between the models are small compared with the mean flow heat transport. When a wind shift and intensification is applied in these warming scenarios, the warming asymmetry is further enhanced, with greater upwelling of cool water in the Southern Ocean and enhanced warming in the NH. Surface air temperatures show a substantial but lesser degree of high-latitude warming asymmetry, reflecting the sea surface warming patterns over the ocean but warming more symmetrically over the land regions.


2009 ◽  
Vol 7 (44) ◽  
pp. 397-408 ◽  
Author(s):  
William Rowe ◽  
Mark Platt ◽  
David C. Wedge ◽  
Philip J. Day ◽  
Douglas B. Kell ◽  
...  

Properties of biological fitness landscapes are of interest to a wide sector of the life sciences, from ecology to genetics to synthetic biology. For biomolecular fitness landscapes, the information we currently possess comes primarily from two sources: sparse samples obtained from directed evolution experiments; and more fine-grained but less authentic information from ‘ in silico ’ models (such as NK -landscapes). Here we present the entire protein-binding profile of all variants of a nucleic acid oligomer 10 bases in length, which we have obtained experimentally by a series of highly parallel on-chip assays. The resulting complete landscape of sequence-binding pairs, comprising more than one million binding measurements in duplicate, has been analysed statistically using a number of metrics commonly applied to synthetic landscapes. These metrics show that the landscape is rugged, with many local optima, and that this arises from a combination of experimental variation and the natural structural properties of the oligonucleotides.


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