Computer Modelling of Loading-Induced Fluid Motion in 3D Osteon Model

Based on the solution of the problem of non-stationary heat transfer during fluid motion in underground permeable layers, dependence was obtained to determine the operating time of the geothermal circulation system in the regime of constant and falling temperatures. It has been established that for a thickness of the layer H <4 m, the influence of heat influxes at = 0.99 and = 0.5 is practically the same, but for a thickness of the layer H> 5 m, the influence of heat inflows depends significantly on temperature. At a thickness of the permeable formation H> 20 m, the heat transfer at = 0.99 has virtually no effect on the thermal processes in the permeable formation, but at = 0.5 the heat influx, depending on the speed of movement, can be from 50 to 90%. Only at H> 50 m, the effect of heat influx significantly decreases and amounts, depending on the filtration rate, from 50 to 10%. The thermal effect of the rock mass with its thickness of more than 10 m, the distance between the discharge circuit and operation, as well as the speed of the coolant have almost no effect on the determination of the operating time of the GCS in constant temperature mode. During operation of the GCS at a dimensionless coolant temperature = 0.5, the velocity of the coolant is significant. With an increase in the speed of the coolant in two times, the error changes by 1.5 times.

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Analysis and CAD modelling of a new geometric spiroid hob

International Review of Applied Sciences and Engineering ◽

10.1556/1848.2015.6.2.2 ◽

2015 ◽

Vol 6 (2) ◽

pp. 89-93

Author(s):

S. Bodzás ◽

I. Dudás

Keyword(s):

Computer Modelling ◽

Cad Model ◽

Axial Section ◽

Cad Modelling ◽

Definition Of

The objectives of this publication are the analysis of surfaces and edges of a new geometric spiroid hob with arched profile in axial section and the definition of their equations for computer modelling. On the basis of this we will work out the CAD model of hob for our further geometric calculations.

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Modelling Lunar Extremes

Journal of Skyscape Archaeology ◽

10.1558/jsa.34686 ◽

2018 ◽

Vol 3 (2) ◽

pp. 207-216 ◽

Cited By ~ 1

Author(s):

David Fisher ◽

Lionel Sims

Keyword(s):

High Precision ◽

Celestial Mechanics ◽

Computer Modelling ◽

Landscape Context ◽

The Sun ◽

The Moon

Claims first made over half a century ago that certain prehistoric monuments utilised high-precision alignments on the horizon risings and settings of the Sun and the Moon have recently resurfaced. While archaeoastronomy early on retreated from these claims, as a way to preserve the discipline in an academic boundary dispute, it did so without a rigorous examination of Thom’s concept of a “lunar standstill”. Gough’s uncritical resurrection of Thom’s usage of the term provides a long-overdue opportunity for the discipline to correct this slippage. Gough (2013), in keeping with Thom (1971), claims that certain standing stones and short stone rows point to distant horizon features which allow high-precision alignments on the risings and settings of the Sun and the Moon dating from about 1700 BC. To assist archaeoastronomy in breaking out of its interpretive rut and from “going round in circles” (Ruggles 2011), this paper evaluates the validity of this claim. Through computer modelling, the celestial mechanics of horizon alignments are here explored in their landscape context with a view to testing the very possibility of high-precision alignments to the lunar extremes. It is found that, due to the motion of the Moon on the horizon, only low-precision alignments are feasible, which would seem to indicate that the properties of lunar standstills could not have included high-precision markers for prehistoric megalith builders.

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On a flight safety problem - Internal fluid motion in an aircraft

10.2514/6.1995-3927 ◽

1995 ◽

Author(s):

V Vyshinskij ◽

S Kravchenko

Keyword(s):

Fluid Motion ◽

Flight Safety ◽

Safety Problem ◽

Internal Fluid

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Visualizing 3D Molecular Structures Using an Augmented Reality App

10.26434/chemrxiv.10031888.v1 ◽

2019 ◽

Author(s):

Kristina Eriksen ◽

Bjarne Nielsen ◽

Michael Pittelkow

Keyword(s):

Augmented Reality ◽

Small Molecules ◽

Computer Modelling ◽

Simple Procedure ◽

3D Structure ◽

Molecular Structures ◽

Free Software ◽

Programming Skills ◽

2D Space ◽

Made In

<p>We present a simple procedure to make an augmented reality app to visualize any 3D chemical model. The molecular structure may be based on data from crystallographic data or from computer modelling. This guide is made in such a way, that no programming skills are needed and the procedure uses free software and is a way to visualize 3D structures that are normally difficult to comprehend in the 2D space of paper. The process can be applied to make 3D representation of any 2D object, and we envisage the app to be useful when visualizing simple stereochemical problems, when presenting a complex 3D structure on a poster presentation or even in audio-visual presentations. The method works for all molecules including small molecules, supramolecular structures, MOFs and biomacromolecules.</p>

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