scholarly journals Registration of the dispersed composition of aerosol media by the holographic method

2021 ◽  
Vol 279 ◽  
pp. 02001
Author(s):  
Vladimir Semenov
Keyword(s):  
Information Content ◽  
Digital Holography ◽  
Layer By Layer ◽  
Holographic Method ◽  
Holographic Image ◽  
Amount Of Information ◽  
Complex Shapes ◽  
Volumetric Representation ◽  
Measured Particle

The article describes a device based on the holographic method for measuring the parameters of dispersed aerosols. In the proposed device, the measured particle is irradiated with two beams perpendicular to the main radiation axis, while the resulting holographic image in each of the projections gives an increased amount of information (in contrast to existing solutions) about the parameters of the particles. The information obtained is processed layer by layer using digital holography methods to form a volumetric representation of the aerosol under study, which significantly increases the information content of measurements in comparison with existing devices. Methods and algorithms for layer-by-layer processing of the obtained holographic images are described, which make it possible to reconstruct the parameters of aerosols of complex shapes. The design of the device and an algorithm for layer-by-layer reconstruction of aerosol images are proposed.

scholarly journals Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape Measurement

2019 ◽  
Vol 2019 ◽  
pp. 1-6
Author(s):  
Davood Khodadad
Keyword(s):  
Phase Difference ◽  
Digital Holography ◽  
Relative Phase ◽  
Groove Depth ◽  
Phase Unwrapping ◽  
Shape Measurement ◽  
Phase Ambiguity ◽  
Holographic Method ◽  
Height Range ◽  
Phase Differences

We present a digital holographic method to increase height range measurement with a reduced phase ambiguity using a dual-directional illumination. Small changes in the angle of incident illumination introduce phase differences between the recorded complex fields. We decrease relative phase difference between the recorded complex fields 279 and 139 times by changing the angle of incident 0.5° and 1°, respectively. A two cent Euro coin edge groove is used to measure the shape. The groove depth is measured as ≈300  μm. Further, numerical refocusing and analysis of speckle displacements in two different planes are used to measure the depth without a use of phase unwrapping process.

scholarly journals Application of Infrared Digital Holography for Characterization of Inhomogeneities and Voluminous Defects of Single Crystals on the Example of ZnGeP2

2020 ◽  
Vol 10 (2) ◽  
pp. 442 ◽  
Author(s):  
Victor Dyomin ◽  
Alexander Gribenyukov ◽  
Sergey Podzyvalov ◽  
Nikolay Yudin ◽  
Mikhail Zinoviev ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Spatial Resolution ◽  
Digital Holography ◽  
Second Phase ◽  
Experimental Setup ◽  
Holographic Method ◽  
Comparison Of The Results

In this work, the method of IR digital holography intended for detection of volumetric defects in ZnGeP2 single crystals has been tested. The holographic method is verified by a comparison of the results obtained with the data obtained by other methods. The spatial resolution of the experimental setup is ~15–20 µm. The volumetric defects of the ZnGeP2 crystal structure (in samples with thickness up to 50 mm) such as growth striations, dislocation chain, and inclusions of the second phase (Zn3P2) shaped as needles up to ~100 µm long and ~10 µm wide have been visualized by the method of IR digital holography.

scholarly journals Information Content of the Amalgamated Hromadas’ Websites and its Impact on Center-Periphery Interactions

2020 ◽  
Vol 10 (513) ◽  
pp. 233-240
Author(s):  
A. O. Maksymenko ◽  
Keyword(s):  
Content Analysis ◽  
Information Content ◽  
Public Information ◽  
The Internet ◽  
Regulatory Activity ◽  
Investment Projects ◽  
Amount Of Information ◽  
General Fund ◽  
Tourism Resources ◽  
Per Capita

The article analyzes the information content of the websites of amalgamated hromadas (AHs). On the example of AHs of Lviv region, a content analysis of the information on websites was carried out. Of the 41 formed during 2015-2019 amalgamated hromadas of Lviv region, 38 hromadas have created their official website. Mostly, the AHs’ websites cover: information about the activities of the management apparatus; information about the governance apparatus and the deputy composition of the AH council; budget and use of budget funds; participation of citizens in governance; regulatory activity/policy; strategic documents; passport of AH; detailed description of infrastructure, labor, agricultural, natural, tourism resources, enterprises operating on the territory of AH; there is a tab with information about ASC; investment passport and the land plots, which are intended for the implementation of investment projects, as well as information about the activities of various departments and communal utilities. It is noted that during the coverage of information on official websites, executive authorities should be guided by the Resolution of the Cabinet of Ministers of Ukraine «On the procedure for publishing information on the activities of executive authorities on the Internet», as well as Art. 15 of the Law of Ukraine «On Access to Public Information». It is determined that the most common is information about the composition and activities of the AH governance apparatus, information about the deputy composition, budget and use of budget funds, regulatory activities. The index of the amount of information covered is proposed and computed. It is concluded that AHs with general fund income (without transfers) per capita of more than 3000 UAH have more informatively filled websites. However, the type of hromada (urban or rural) does not influence the amount of information covered on the website. In general, the carried out analysis showed the lack of asymmetry in the disclosure and dissemination of information through the official websites of AHs of the Lviv region.

scholarly journals Significance of the Correlation in Turn-taking Dialogues

2013 ◽  
Vol 99 (1) ◽  
pp. 75-84
Author(s):  
Lourembam Surjit Singh ◽  
R.K. Brojen Singh
Keyword(s):  
Information Content ◽  
Significant Information ◽  
Information Functions ◽  
Amount Of Information ◽  
Turn Taking ◽  
Radio Play ◽  
The Relationship

Abstract This piece of work investigates the relation between characters in a play based on turntaking dialogues. As the dialogues are related to each other in the play, numbers of turn-taking are significant of the characters’ relationship and the utterances give indication about the information content of the interaction. In this Manipuri radio play, the sequence of turns taken by the characters convey different amount of information with different functions. Numbers of dialogues oscillate significantly with a period of 2 scenes during the play. The degree of oscillation present in turn-taking dialogues carries significant information functions. The nature of the relationship between the characters involved and the theme of the play may be characterised by calculations on turn-taking dialogues.

Principles of Holography

2014 ◽  
pp. 150-166
Author(s):  
Martin Richardson
Keyword(s):  
Digital Holography ◽  
Holographic Principle ◽  
Holographic Image ◽  
Creative Art ◽  
Transmission And Reflection ◽  
Holographic Stereograms

The discovery of diffraction and interference led eventually to the holographic principle, the recording and reconstruction of the shape of a wavefront. Transmission and reflection holograms are detailed in this chapter, along with the principles of rainbow holograms and holographic stereograms and their applications. Digital holography is described in the form of multiplexed images. The psychological and philosophical implications of the holographic image are discussed with some examples from the field of creative art.

Mortar for 3D Printing Based on Gypsum Binders

2021 ◽  
Vol 1037 ◽  
pp. 26-31
Author(s):  
Ekaterina Potapova ◽  
Tatiana Guseva ◽  
Kirill Shchelchkov ◽  
Hans Bertram Fischer
Keyword(s):  
3D Printing ◽  
Structural Design ◽  
High Speed ◽  
High Viscosity ◽  
Solid Model ◽  
3D Printer ◽  
Layer By Layer ◽  
Adhesive Properties ◽  
Binding Material ◽  
Complex Shapes

3D construction printer - is an innovative construction approach with which building elements can be constructed without the use of formwork and you to get products of various complex shapes with minimal time and material costs. Binder 3D printing technology results in a cheap and high-speed construction method that allows greater freedom in both architectural and structural design of concrete. The principle of operation of a 3D printer is based on the principle of gradual (layer-by-layer) creation of a solid model, which is, as it were, "grown" from a certain binding material. The working mixture must have thixotropic and adhesive properties, it must be workable by the printer and at the same time not spread under the influence of subsequent layers. Therefore, it is important to select the composition of the composition of the working mixture. This paper presents the results of a study on the development of the composition of a working mixture based on a gypsum-cement-pozzolanic binder. The developed composition of the gypsum-cement-pozzolanic binder with a complex of modifying additives is characterized by low spreadability, high viscosity and is easy to lay.

scholarly journals Engineering calculations for complex geometric domains

2018 ◽  
Vol 157 ◽  
pp. 02009 ◽  
Author(s):  
Elzbieta Gawronska ◽  
Robert Dyja ◽  
Andrzej Grosser ◽  
Jerzy Winczek
Keyword(s):  
Volume Fraction ◽  
Layer By Layer ◽  
The Finite Element Method ◽  
Compound Structure ◽  
Software Module ◽  
Volume Percentage ◽  
Unit Cell Size ◽  
Complex Shapes ◽  
Full Structure ◽  
Spherical Core

The paper aims to present the possibility of performing engineering calculations in domains of complex shapes expressed by mathematical descriptions. We focus on calculations done with the use of the Finite Element Method. An example of the compound structure is gyroid, which is a periodic structure representing an area close to the porous structure. The presented gyroid structure exhibits circular struts and a spherical core and spatially occupies a cube. The side length of the cube is defined as unit cell size, and the volume percentage of the struts inside the cube is referred to as volume fraction. The periodic cellular lattice structures are generated by our own software module. One of the uses of such structures is their employment in additive manufacturing (AM) of the so-called 3D printing (layer-by-layer AM technique), where they can contribute reducing the weight of an item and limiting the material consumption. It is important to answer the question of what effect does an element with a gyroid structure have on the thermal properties (e.g. the heat flow versus the volume fraction) compared to an element with full structure. The paper will show the results of such a comparison.

scholarly journals ACCURATE INTERACTIVE ANIMATION OF DEFORMABLE MODELS AT ARBITRARY RESOLUTION

2010 ◽  
Vol 10 (02) ◽  
pp. 175-202 ◽  
Author(s):  
MATTHIEU NESME ◽  
FRANÇOIS FAURE ◽  
YOHAN PAYAN
Keyword(s):  
Patient Specific ◽  
Medical Simulation ◽  
Interactive Simulation ◽  
The Finite Element Method ◽  
Interactive Animation ◽  
Hexahedral Elements ◽  
Complex Shapes ◽  
Volumetric Representation ◽  
Volumetric Rendering ◽  
Theoretical Results

Providing realistic interactive simulation requires a powerful animation method with a highly detailed rendering. Based on continuum mechanics, the finite element method needs a volumetric representation of the object to animate. This paper proposes an automatic method for building meshes that are well adapted to interactive simulation starting from miscellaneous input data. Contrary to commonly used methods based on tetrahedral volume meshing, the object is embedded in a regular grid of deformable hexahedra at an arbitrary resolution. This alleviates the complexities and limitations of tetrahedra and results in regular, well-conditioned meshes. Mass and stiffness are set in order to model the physical properties as accurately as possible at any given resolution, in a manner that takes into account the distribution of material within the hexahedra. This allows us to accurately model the mechanical properties of the partially empty boundary hexahedra, and thus enables us to perform fast simulation at a coarse resolution. The accuracy of this approach is compared to theoretical results. In addition, we extend a fast and robust co-rotational approach to the case of hexahedral elements. This permits simulation of arbitrarily complex shapes at interactive rates. We show how to build the hexahedra directly from surfaces and from segmented scanned data, which is very useful to animate complex artistic models or patient specific models for individual medical simulation. Finally, we show how a fast volumetric rendering can make efficient use of the grid structure.

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