Computer generated holography is a method of using numerical methods to simulate the physical processes underlying a real hologram's optical recording and reconstruction i.e. the method of digitally ...generating holographic interference patterns. As such, it represents substantial progress compared to classical holography. A major disadvantage of this approach is the absence of specialized software tools for computer generated holograms and extremely high computer resource consumption, resulting in an excessive computing time. The goal of this paper is to create a physically plausible computer model for generating holograms, with a large potential for calculation optimization and acceleration, as well as the integration of this model into simple hologram creation software. We made software that simulates wave optics using previously known physical model to generate a hologram with the possibility of connection with commercial 3D tools via .obj documents. Considering that there is a problem of high computing resources consumption and time we have incorporated in our software the possibility of a parallel calculation for the purpose of testing, further software development and customization to optimize the computer generation of holograms.
Rapid development and expanding deployment of additive manufacturing mark this technology as an acceptable alternative to traditional methods of production in terms of speed and quality. All types of ...additive manufacturing technologies build objects layer by layer, therefore anisotropy of mechanical properties is often encountered, making it difficult to accurately predict the mechanical behavior of additively manufactured parts. This paper examines the mechanical properties of additively manufactured parts and the creation of an anisotropic digital material model that can be used to accurately simulate the behavior of additively manufactured parts using FEA (Finite Element Analysis). A three-point bending test was performed on samples created using SLA (Stereolithography) technology. The identical bending scenario was computer modeled using FEA, while the modified manufacturer's data was used for digital material creation. Comparison and analysis of the experimentally obtained results and the results of the FEA were performed.
Abstract
The ultimate goal of each production process is to optimize all the subprocesses leading to the high quality final product. Within the printing process, dot gain is identified as one of the ...most important variables to control because of the extremely negative impact to middle tone contrast and the overall reproduction. Dot gain consists of two components, mechanical and optical dot gain, as a result of two different contributions. This article proposes a model for separately analyzing components of dot gain for electrophotography prints using gradient method, where the impact of printing technique and paper type will be examined. It is shown that mechanical dot gain for electrophotography prints can be satisfactorily approximated with Gaussian, whilst optical dot gain is once again confirmed to have the form of a Lorentzian.
U radu je prikazan dizajn vertikalne farme u obliku 3D modela. Cilj je predstaviti modernizirani način uzgajanja poljoprivrednih dobara koji će u budućnosti unaprijediti, te zamijeniti oblike uzgoja ...koji se koriste danas. Vertikalne farme se smatraju potencijalnom budućnosti poljoprivrede jer u odnosu na konvencionalne načine poljoprivrednih uzgoja imaju veći urod na manjoj jedinici površine. Smještaj vertikalnih farmi u neposrednoj blizini urbanih središta osigurava rast raznolikih vrsta usjeva neovisno o klimi i lokaciji. Osim uzgoja poljoprivrednih dobara za prehranu, vertikalne farme osiguravaju lijepu estetiku u urbanim središtima. Vertikalne farme omogućuju povećanu proizvodnje hrane i proširenje poljoprivrednih sustava. Navedeni način uzgoja uvelike pomaže u smanjenju rastućih globalnih potreba za hranom na ekološki odgovoran i održiv način. 1 U idućim desetljećima, u kojima će prenaseljenost i ozbiljne globalne promjene utjecati na dosadašnji način života, vertikalne farme postat će nužno rješenje u globalnoj proizvodnji hrane. 2 Za izradu 3D modela vertikalne farme korišten je računalni program za 3D modeliranje, Maxon Cinema 4D R23.
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