scholarly journals STUDY OF DNIEPER’S ISLANDS’ SHORELINE CHANGE DYNAMICS WITHIN KIEV REGION (AT THE EXAMPLE OF VELYKIY PIVNICHNIY ISLAND)

2017 ◽  
pp. 84-88
Author(s):  
O. Tomchenko ◽  
L. Mazurkiewicz ◽  
A. Malets
Keyword(s):  
Three Dimensional ◽  
Remote Sensing Data ◽  
Shoreline Change ◽  
Coastal Landscape ◽  
Conservation Area ◽  
City Formation ◽  
Long Time ◽  
Grand Island ◽  
Three Dimensional Models ◽  
The 19Th Century

Changes of Dnieper’s islands’ landscapes within Kyiv at the example of Velykiy Pivnichniy Island are studied. Using GIS, cartographic materials and remote sensing data the island’s square dynamic for more than seventy years is obtained. During decoding vector layers – the contours of the coastline of the island and the island area – were created and island’s square for 1942, 1975, 1985, 1990, 2000, 2015 years was estimated. Using module implemented in ArcScene ArcGIS the dynamics of long-term changes of Velykiy Island’s shape was modeled and clearly reflected in the form of three-dimensional models. The coastal landscape of Kyiv began to rapidly change for the past 100-200 years due to rapid urban sprawl. Before it Dnieper’s backwater in Kyiv formed by glaciers and it became the basis for floodplain in Kyiv region for a long time. In the 19th century held-rectifying work was conducted and it greatly influenced the coastal landscape of our city. Formation of new islands, such as Grand Island and changes of old islands (such as the island of Murom united with Truhanov Island) has begun. Great Island consisted of 2 parts, one of which joined the island much later than the first part of the island was formed. From 1950 to 1990 the island had the largest area and it was unchanged while this period. The rapid square reduction began in the 1990s when sand mining started for the purpose of Troieshchyna district building. Currently the island is used as a career for the extraction of sand, which is important for development of different districts, including cottages on the site of meadows and oak forests on north of the Gulf of Camel. It is a negative factor for the island, where there are different species of animals and plants are located. The island is also an example of modern Dnieper floodplain formation and it should be preserved as a conservation area of the city.

scholarly journals Morpholithodynamics of lagoonal straits of the North-Eastern Sakhalin

2019 ◽  
pp. 79-94
Author(s):  
V. V. Afanasev
Keyword(s):  
Additional Data ◽  
Three Dimensional ◽  
Remote Sensing Data ◽  
Water Area ◽  
The North ◽  
North Eastern ◽  
Geological Information ◽  
History Of ◽  
Three Dimensional Models ◽  
And Migration

The results of the analysis of geospatial and geological information on the structure and dynamics of the lagoon coast of the North-Eastern Sakhalin are presented. On the basis of a number of parameters of the coastal erosion-accumulation processes and migration of lagoon straits during the period 1927–2014. the morpholithodynamics system of the North-Eastern Sakhalin was considered. The volume of sediments transported during the migration of the straits, was estimated with the help of three-dimensional models, in which, parallel with time-averaged areas of erosion and accumulation, additional data were used, namely: bathymetry of the straits and adjacent water area, characteristics of the relief of the barrier forms and geological information obtained as a result of georadar survey and drilling. Georadar data, together with remote sensing data, have made it possible to create a model of sedimentation, which formed the basis for the analysis of the history of the coast formation beyond the period of observations. Currently, we can trace the situation as long as to the middle of the XIXth century.

scholarly journals Simulation Models for Solar Photovoltaic Materials

2021 ◽  
pp. 114-133
Author(s):  
M. Rizwan
Keyword(s):  
Solar Cell ◽  
Band Structure ◽  
Computer Modelling ◽  
Three Dimensional ◽  
Simulation Models ◽  
Semiconductor Materials ◽  
Long Time ◽  
Three Dimensional Models ◽  
Materials Used ◽  
Device Operation

Semiconducting materials have dominated the photovoltaic industry for a long time. The advancement in solar cell technology is significantly influenced by computer modelling, designing and simulations of the semiconductor materials used for the device operation. Different modelling techniques including one, two and three dimensional models had been employed to comprehend the device operation of solar cell and other electronic devices based on semiconductor materials such as silicon and gallium arsenide. The performance of computing power is increasing with the passage of time in order to improve modelling and designing of different semiconductor materials for solar cell devices. In this chapter, different reported semiconductor materials, their standard characteristics and basic history of modelling, standard models used in photovoltaic industry and principles of modelling such as carrier statistics, transitions, band structure and mobility are explained in detail. Different characteristics of semiconductor material like the carrier transportation, carrier statistics, band structure, and heavy doping effect and carrier generations are described with respect to material modelling.

scholarly journals La enseñanza de la Botánica y los modelos anatómicos de Les Fils d’Émile Deyrolle

2018 ◽  
pp. 113-130
Author(s):  
José Pedro Marín Murcia
Keyword(s):  
Secondary School ◽  
Three Dimensional ◽  
Complete Collection ◽  
Secondary School Education ◽  
French Firm ◽  
Siglo Xix ◽  
Three Dimensional Models ◽  
The University ◽  
The 19Th Century ◽  
Siglo Xx

Resumen Los modelos anatómicos fueron muy utilizados en la enseñanza de la historia natural entre el siglo XIX y primer tercio de siglo XX. Hoy en día, siguen siendo un recurso didáctico importante para la enseñanza de la biología en muchos centros históricos de secundaria y museos de nuestro país. Estudiamos los modelos tridimensionales de la casa comercial francesa Les Fils d’Émile Deyrolle con su oferta de reproducción de organismos y estructuras botánicas, centrando nuestra investigación en una de las colecciones más completas que existen de esta serie conservada en el antiguo gabinete-laboratorio de biología de la Universidad de Murcia. Por una parte, se analizan sus características técnicas, funcionamiento, así como también su función didáctica y contenidos asociados. Abstract Anatomical models were widely used in the teaching of natural history between the 19th century and the first third of the 20th century. Nowadays, they still are an important didactic resource in many historical institutions of secondary school education and museums in Spain. We study the three-dimensional models of the French firm Les Fils d’Émile Deyrolle, which offered a reproduction of organisms and structures related to botany. We focused our study on one of the most complete collection - kept in the historic laboratory of biology of the University of Murcia. Its technical characteristics, functioning, as well as its didactic function and associated contents have been included in our analysis.

Two- and Three-Dimensional Models of Dispersion Based upon Measurements in the North Sea

1991 ◽  
Vol 24 (10) ◽  
pp. 45-53 ◽  
Author(s):  
G. C. van Dam
Keyword(s):  
North Sea ◽  
Three Dimensional ◽  
Historical Review ◽  
Particle Simulation ◽  
Simulation Methods ◽  
The North ◽  
Recent Developments ◽  
Long Time ◽  
The North Sea ◽  
Three Dimensional Models

After a brief historical review some recent developments are discussed, with an emphasis on particle simulation methods. Examples are shown of relatively short and relatively long time scale applications in connection with accidental spills and problems of continuous sources respectively.

scholarly journals Generation of 3D Tumor Models from DICOM Images for Virtual Planning of its Recession

2020 ◽  
Vol 29 (54) ◽  
pp. e10173
Author(s):  
Oscar Rodríguez-Bastidas ◽  
Hermes Fabián Vargas-Rosero
Keyword(s):  
Medical Images ◽  
Computational Cost ◽  
Three Dimensional ◽  
Tumor Model ◽  
Reconstruction Technique ◽  
Virtual Planning ◽  
New Techniques ◽  
Segmentation Strategy ◽  
Long Time ◽  
Three Dimensional Models

Medical images are essential for diagnosis, planning of surgery and evolution of pathology. The advances in technology have developed new techniques to obtain digital images with more details, in return this has also led to disadvantages, such as: the analysis of large volumes of information, long time to determine an affected region and difficulty in defining the malignant tissue for its later extirpation, among the most relevant. This article presents an image segmentation strategy and the optimization of a method for generating three-dimensional models. A prototype was implemented in which it was possible to evaluate the segmentation algorithms and 3D reconstruction technique, allowing to visualize the tumor model from different points of view through virtual reality. In this investigation, we evaluate the computational cost and user experience, the parameters selected in terms of computational cost are the time and consumption of RAM, we used 140 MRI images each with dimensions 260x320 pixel, and as a result, we obtained an approximate time of 37.16s and consumption in RAM of 1.3GB. Another experiment carried out is the segmentation and reconstruction of a tumor, this model is formed by a three-dimensional mesh made up of 151 vertices and 318 faces. Finally, we evaluate the application, with a usability test applied to a sample of 20 people with different areas of knowledge. The results show that the graphics presented by the software are pleasant, they also show that the application is intuitive and easy to use. Additionally, it is mentioned that it helps improve the understanding of medical images.

scholarly journals Key Aspects in 3D Fatigue Crack Closure Numerical Modelling

2018 ◽  
Vol 774 ◽  
pp. 441-446 ◽  
Author(s):  
Antonio González-Herrera ◽  
Daniel Camas ◽  
J. Garcia-Manrique
Keyword(s):  
Fatigue Crack ◽  
Numerical Modelling ◽  
Crack Closure ◽  
Three Dimensional ◽  
3D Models ◽  
Fatigue Crack Closure ◽  
Long Time ◽  
Dimensional Models ◽  
Three Dimensional Models ◽  
Key Aspects

Since long time, fatigue crack closure has been studied by means of finite element models. Initially by bi-dimensional models and recently, due to the higher computational capabilities, the use of three-dimensional models has been extended, providing a wider comprehension of the problem. Starting with the methodology used for 2D cases, a specific methodology for 3D models has been developed. Key parameters affecting the model have been analyzed and recommendations have been established. The numerical accuracy is evaluated in terms of crack closure and opening values. They main issues studied are the material behaviour, the loading cycles and crack growth scheme, the contact simulation, the meshing and the element size at the crack tip and along the thickness, the plastic wake computed and the opening and closure definition considered. This paper summarises the main learning and recommendations from the latest numerical modelling experience of the authors.

Plastic replicas as three-dimensional models of pulps

1975 ◽  
Vol 39 (8) ◽  
pp. 544-546
Author(s):  
HL Wakkerman ◽  
GS The ◽  
AJ Spanauf
Keyword(s):  
Three Dimensional ◽  
Dimensional Models ◽  
Three Dimensional Models

Validation of a Belt Model for Prediction of Hub Forces from a Rolling Tire4

2009 ◽  
Vol 37 (2) ◽  
pp. 62-102 ◽  
Author(s):  
C. Lecomte ◽  
W. R. Graham ◽  
D. J. O’Boy
Keyword(s):  
Internal Pressure ◽  
Equations Of Motion ◽  
Three Dimensional ◽  
Prediction Method ◽  
Analytical Models ◽  
Beam Model ◽  
Impedance Boundary ◽  
Bending Waves ◽  
Tire Rotation ◽  
Three Dimensional Models

Abstract An integrated model is under development which will be able to predict the interior noise due to the vibrations of a rolling tire structurally transmitted to the hub of a vehicle. Here, the tire belt model used as part of this prediction method is first briefly presented and discussed, and it is then compared to other models available in the literature. This component will be linked to the tread blocks through normal and tangential forces and to the sidewalls through impedance boundary conditions. The tire belt is modeled as an orthotropic cylindrical ring of negligible thickness with rotational effects, internal pressure, and prestresses included. The associated equations of motion are derived by a variational approach and are investigated for both unforced and forced motions. The model supports extensional and bending waves, which are believed to be the important features to correctly predict the hub forces in the midfrequency (50–500 Hz) range of interest. The predicted waves and forced responses of a benchmark structure are compared to the predictions of several alternative analytical models: two three dimensional models that can support multiple isotropic layers, one of these models include curvature and the other one is flat; a one-dimensional beam model which does not consider axial variations; and several shell models. Finally, the effects of internal pressure, prestress, curvature, and tire rotation on free waves are discussed.

In Silico Identification and Molecular Characterization of Extracellular Cathepsin L Proteases from Giardia duodenalis

2020 ◽  
Vol 17 (4) ◽  
pp. 342-351
Author(s):  
Sergio A. Durán-Pérez ◽  
José G. Rendón-Maldonado ◽  
Lucio de Jesús Hernandez-Diaz ◽  
Annete I. Apodaca-Medina ◽  
Maribel Jiménez-Edeza ◽  
...  
Keyword(s):  
In Silico ◽  
Cathepsin L ◽  
Three Dimensional ◽  
Giardia Duodenalis ◽  
Evolutionary Genetics ◽  
Extracellular Proteins ◽  
In Silico Identification ◽  
Dimensional Models ◽  
Three Dimensional Models

Background: The protozoan Giardia duodenalis, which causes giardiasis, is an intestinal parasite that commonly affects humans, mainly pre-school children. Although there are asymptomatic cases, the main clinical features are chronic and acute diarrhea, nausea, abdominal pain, and malabsorption syndrome. Little is currently known about the virulence of the parasite, but some cases of chronic gastrointestinal alterations post-infection have been reported even when the infection was asymptomatic, suggesting that the cathepsin L proteases of the parasite may be involved in the damage at the level of the gastrointestinal mucosa. Objective: The aim of this study was the in silico identification and characterization of extracellular cathepsin L proteases in the proteome of G. duodenalis. Methods: The NP_001903 sequence of cathepsin L protease from Homo sapienswas searched against the Giardia duodenalisproteome. The subcellular localization of Giardia duodenaliscathepsin L proteases was performed in the DeepLoc-1.0 server. The construction of a phylogenetic tree of the extracellular proteins was carried out using the Molecular Evolutionary Genetics Analysis software (MEGA X). The Robetta server was used for the construction of the three-dimensional models. The search for possible inhibitors of the extracellular cathepsin L proteases of Giardia duodenaliswas performed by entering the three-dimensional structures in the FINDSITEcomb drug discovery tool. Results: Based on the amino acid sequence of cathepsin L from Homo sapiens, 8 protein sequences were identified that have in their modular structure the Pept_C1A domain characteristic of cathepsins and two of these proteins (XP_001704423 and XP_001704424) are located extracellularly. Threedimensional models were designed for both extracellular proteins and several inhibitory ligands with a score greater than 0.9 were identified. In vitrostudies are required to corroborate if these two extracellular proteins play a role in the virulence of Giardia duodenalisand to discover ligands that may be useful as therapeutic targets that interfere in the mechanism of pathogenesis generated by the parasite. Conclusion: In silicoanalysis identified two proteins in the Giardia duodenalisprotein repertoire whose characteristics allowed them to be classified as cathepsin L proteases, which may be secreted into the extracellular medium to act as virulence factors. Three-dimensional models of both proteins allowed the identification of inhibitory ligands with a high score. The results suggest that administration of those compounds might be used to block the endopeptidase activity of the extracellular cathepsin L proteases, interfering with the mechanisms of pathogenesis of the protozoan parasite Giardia duodenalis.

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