Wyniki wyszukiwania - BazTech

1

Metaverse as a concept involving the coexistence of many virtual 3D worlds

Kawęcki Norbert

Nowoczesne Systemy Zarządzania

|

2023

|

T. 18, nr 3

99--108

EN

The article presents interesting new concept called Metaverse as a concept involving the coexistence of many virtual 3D worlds. The first part presents definition and history of the concept and moving forward some challenges related to MV. In next part some example of MV literature and main dimension has been developed by author of article. Next to summary and future of MV some opportunities has been presented. The main goal is to present new modern of concept in coexistence between the virtual world and human beings. The article brings: • overview of concept; • facts, statistic, numbers related to the topic; • opportunities and challenges; • future of Metaversum.

PL

W artykule przedstawiono interesującą nową koncepcję o nazwie Metaverse jako koncepcję polegającą na współistnieniu wielu wirtualnych światów 3D. W pierwszej części przedstawiono definicję i historię pojęcia oraz, posuwając się naprzód, niektóre wyzwania związane z MV. W dalszej części autor opracowania rozwinął przykład literatury MV i jej główny wymiar. Oprócz podsumowania i przyszłości MV zaproponowano kilka możliwości. Głównym celem jest przedstawienie nowej i nowoczesnej koncepcji współistnienia świata wirtualnego i człowieka. Artykuł zawiera: • przegląd koncepcji; • fakty, statystyki, liczby związane z tematem; • szanse i wyzwania; • przyszłość Metaversum.

2

Calculation of Road Traffic Noise, Development of Data, and Spatial Interpolations for Traffic Noise Visualization in Three-dimensional Space

Wickramathilaka Nevil, Ujang Uznir, Azri Suhaibah, Choon Tan Liat

Geomatics and Environmental Engineering

|

2023

|

Vol. 17, no. 5

61-85

EN

Road traffic noise visualization is vital in three-dimensional (3D) space. Designing noise observation points (NOPs) and the developments of spatial interpolations are key elements for the visualization of traffic noise in 3D. Moreover, calculating road traffic noise levels by means of a standard noise model is vital. This study elaborates on the developments of data and spatial interpolations in 3D noise visualization. In 3D spatial interpolation, the value is interpolated in both horizontal and vertical directions. Eliminating flat triangles is vital in the vertical direction. Inverse distance weighted (IDW), kriging, and triangular irregular network (TIN) are widely used to interpolate noise levels. Because these interpolations directly support the interpolation of three parameters, the developments of spatial interpolations should be applied to interpolate noise levels in 3D. The TIN noise contours are primed to visualize traffic noise levels while IDW and kriging provide irregular contours. Further, this study has identified that the TIN noise contours fit exactly with NOPs in 3D. Moreover, advanced kriging interpolation such as empirical Bayesian kriging (EBK) also provides irregular shape contours and this study develops a comparison for such contours. The 3D kriging in EBK provides a significant approach to interpolate noise in 3D. The 3D kriging voxels show a higher accurate visualization than TIN noise contours.

3

The natural convection inside a 3D triangular cross section cavity filled with nanofluid and included cylinder with different arrangements

Ghoben Zainab Kareem, Hussein Ahmed Kadhim

Diagnostyka

|

2022

|

Vol. 23, No. 2

no. art. 2022205

EN

In this paper the laminar unsteady natural convection heat transfer of (Al2O3-water) nanofluid inside 3D triangular cross section cavity was investigated. The cavity was heated differentially, the vertical walls were kept at different constant temperatures. The left hot and the right cold. The effect of the solid volume fraction was examined for two values and compared with the pure water results. The (Ra) range studied was (103≤Ra≤106). Inserting cylindrical body inside the cavity also investigated in three cases. One concentric cylinder has radius (15%) of the cavity side length. The other cases were of two cylinders having radius (7.5%) of the cavity side length, aligned vertically or nonaligned. The results show that the higher solid volume fraction gives the maximum enhancement of the average (Nu) and this enhancement increases with (Ra) increase. For the cases with inner cylinders, the average (Nu) enhanced for the case of double cylinders over single cylinder. On other hand, the nonaligned position of the cylinders giving more enhancement than other position. As like as, the location of maximum horizontal or vertical velocities were varied with the cylinders position while (Ra) has no effect.

4

Hydrogels for 3D bioprinting

Golda-Cepa Monika, Smet Jasper, Fudali Julia, Tomsic Brigita, Declercq Heidi, Kotarba Andrzej

Engineering of Biomaterials

|

2021

|

Vol. 24, no. 163

105

5

Development of a 3D-printed PCL-TiAlNb material composite with anti-microbial ZnO coating for next-generation maxillofacial implants

Lackner Juergen M., Major Roman, Clement Gullaume, Jabłoński Robert, Kaindl Reinhard, Russmueller Guenter

Engineering of Biomaterials

|

2021

|

Vol. 24, no. 163

15

6

Composite inks of hydrogels and inorganic bioactive fillers as potential materials for 3D bioprinting

Biernat Monika, Woźniak Anna, Ciołek Lidia, Szterner Piotr

Engineering of Biomaterials

|

2021

|

Vol. 24, no. 163

62

7

3D bioprinting - dedicated biomaterials and devices

Bociaga Dorota, Rosinska Karolina, Bartniak Mateusz, Wierzbicka Adrianna, Clapa Marian, Sobczyk-Guzenda Anna

Engineering of Biomaterials

|

2021

|

Vol. 24, no. 163

9

8

3D bioprinted human tissue models for pharmaceutical and cosmetic product testing

Blell Josefin, Pernevik Elin, Gullstrand Mickis, Nath Shubhankar, Jaiswal Himjyot, Kuzmenko Volodymyr, Redwan Itedale Namro

Engineering of Biomaterials

|

2021

|

Vol. 24, no. 163

11

9

3D Design of Clothing in Medical Applications

Cichocka Agnieszka, Frydrych Iwona, Zimniewska Małgorzata, Muzyczek Małgorzata, Mikołajczak Przemysław, Schmidt-Przewoźna Katarzyna, Romanowska Barbara, Pawlaczyk Mariola, Krucińska Izabella, Komisarczyk Agnieszka, Kowalska Stanisława, Herczyńska Lucyna, Urbaniak Monika

Autex Research Journal

|

2021

|

Vol. 21, no. 4

408--412

EN

In this paper, we present a new methodology of clothing engineering construction for the medical application. Project “BIOAKOD” intends to propose clothing solutions for elderly people with dermatological defects. This purpose requires a particular concept of clothing because of the additional functionality expected in the clothing. It means that the proposed clothing needs to cover a human body in an aesthetic way and gives comfort of use it, and it should also bring an adding value in health treatment of people with dermatosis (psoriasis).

10

Magnetyzm środowiskowy : badania podatności magnetycznej w mikroskali z obrazowaniem 3D

Łukasik Adam, Szuszkiewicz Maria Magdalena, Szuszkiewicz Marcin

Przegląd Geofizyczny

|

2020

|

Z. 3-4

167--177

PL

Podatność magnetyczna gleb jest parametrem geofizycznym wykorzystywanym, między innymi, w badaniach środowiskowych, w kontekście zanieczyszczeń atmosferycznych deponowanych na powierzchnię gleby. Właściwości magnetyczne cząstek powstających w procesach technologicznych (spalanie paliw kopalnych, hutnictwo, przemysł cementowy) pozwalają na ich łatwą detekcję w terenie. W warunkach lądowych, gleba jest finalnym odbiorcą zanieczyszczeń pochodzenia atmosferycznego. W pracy przedstawiono wyniki pomiarów podatności magnetycznej gleby leśnej przeprowadzone w rdzeniach pobranych w gęstej siatce pomiarowej (1 m × 1 m) pod okapem buka zwyczajnego (Fagus sylvatica L.). Łącznie pobrano 102 rdzenie, na których w rozdzielczości co 1 cm wykonano 3060 pojedynczych pomiarów objętościowej podatności magnetycznej. Przestrzenny rozkład wartości podatności magnetycznej przedstawiono wykorzystując program do wizualizacji przestrzennej TerraSurveyor 3D. Wyniki potwierdzają kluczową rolę poziomów organicznych w procesie zatrzymywania cząstek magnetycznych. Przestrzenne zobrazowanie wyników wskazuje na wertykalną i horyzontalną zmienność koncentracji cząstek magnetycznych pod koroną pojedynczego drzewa.

EN

Magnetic susceptibility is a geophysical parameter effectively applied in environmental research concerning air derived pollutants and its deposition into topsoil. Magnetic properties of particles formed in technological processes (solid fuel combustion, metallurgical processes, cement industry) simplify their detection in field. Soil is a final receiver of the air borne pollutants in terrestrial ecosystems. The paper present results of magnetic susceptibility measurements conducted on soil cores sampled in dense grid (1 m × 1 m) under European beech (Fagus sylvatica L.) crown. On the total amount of 102 soil cores, volume magnetic susceptibility (κ) was measured in 1 cm interval giving 3060 single values. On the basis of such data set, spatial distribution of topsoil magnetic susceptibility was performed with application TerraSurveyor3D software. Results confirmed critical role of topsoil organic horizons in capture and storage of anthropogenic magnetic particles and indicate vertical and horizontal variability under individual tree.

11

Budownictwo przyszłości – nowe możliwości, trendy, rozwiązania

Szruba Maria, Ferenc Tadeusz, Styliński Jan, Żuchowski Tomasz

Nowoczesne Budownictwo Inżynieryjne

|

2020

|

Nr 4

32--38

PL

Budownictwo na całym świecie mierzy się z coraz większymi i bardziej ambitnymi projektami inwestycyjnymi. Ich sukces w dużym stopniu zależy od wprowadzenia innowacji w zakresie technologii, materiałów, ale także zarządzania inwestycją. Dlatego coraz więcej firm budowlanych decyduje się na cyfryzację procesów projektowania i realizacji obiektów budowlanych.

12

Multisource data integration to investigate a 3D landslide morphology affecting an urban area: case of Bordj Bou Naama (west Algeria)

Zaagane M., Refas S., Abbache A., Mouassa S., Khaldi A.

Mining Science

|

2020

|

Vol. 27

227-251

EN

Situated in the northern part of Algeria, Ouarsenis is one of several area affected by landslide phenomena. Indeed, 60 houses, a stadium and a lot of sports infrastructures are affected by the landslides. In this perspective, we have chosen a model of landslide with an area of 166 700 m2 affecting the southern part of the Bordj Bou Naama city. In order to characterized the landslide structure, we used multisource data (geological, topographical, geophysical and geotechnical). For modeling the 3D landslide surfaces we used three geometric models which are generated from different techniques of interpolation as Inverse Distance Weight (IDW), Minimum Curvature (MC) and Kriging (KO) and applied to the same input data set. The root of the mean square error (RMSE) and visual appearance of the morphology are used to select the best model. Indeed our results show that the KO represents the best model that gives a good result. Quality control is also performed to ensure that the model is suitable for hydro-mechanical modeling. This model show that the total volume of soils moved is ~9.8*105 m3, in which the volume of geological levels is 828 500 m3, 143440 m3 and 11 434.32 m3 respectively for the embankments, colluviums and Brown shale. The bleu shale is far from to be affected by this landslides, indeed the deepest zone that the rupture area affects is located at 12 m of depth. These results seem to be very important in order to plan remediation work in this area.

13

Metody wytwarzania realistycznych pomieszczeń – skanowanie 3D oraz modelowanie 3D

Salwierz Aleksandra, Szymczyk Tomasz

Journal of Computer Sciences Institute

|

2020

|

Vol. 14

101--108

PL

Artykuł przedstawia dwie współczesne metody wytwarzania realistycznych pomieszczeń 3D. Porównanie obejmuje skanowanie 3D za pomocą skanera FARO Focus 3D X330 oraz modelowanie 3D w programie Blender 2.8. Analiza sposobów generowania realistycznych pomieszczeń może okazać się przydatna w wielu dziedzinach np.: w architekturze, druku 3D, grach, wizualizacjach, kryminalistyce, inżynierii wstecznej czy dokumentacji zabytków. Artykuł opisuje proces generowania wybranego pomieszczenia dla każdej z metod. Dokonano porównania obu rozwiązań pod kątem kosztów, dokładności oraz stopnia oddania rzeczywistości. Dodatkowo opisano napotkane problemy oraz wskazano ich możliwe źródła. Oceniono stopień przydatności oraz opłacalności obu metod. Przeprowadzono również badania dotyczące stopnia immersyjności wizualizacji poszczególnych metod w wirtualnej rzeczywistości.

EN

Article shows two modern methods of creating realistic 3D spaces. The comparison includes 3D scanning with FARO Focus 3D X330 and 3D modelling in Blender 2.8. Analysis of methods for creating realistic 3D spaces can be useful in many fields e.g.: architecture, 3D printing, games industry, visualization, criminalistics, reverse engineering or monument documentation. The paper also describes process of generating a chosen space for each method. Each of the two approaches is assessed in terms of the expenses, precision and degree of reflecting reality.. Article includes an analysis of encountered problems and their possible sources. The paper also evaluate usefulness and profitability for each method. A research was carried out and focused on degree of immersion for VR visualizations depending on the used method.

14

Functional Model of a Warp-Knitted Machine for Producing 3D Technical Knitted Fabrics

Michalak Andrzej, Mikołajczyk Zbigniew

Fibres & Textiles in Eastern Europe

|

2020

|

Vol. 28, no. 5 (143)

97--105

EN

The article describes the construction and testing of a functional model of an innovative warp – knitting machine for technical spatial knitted fabrics with an original structure. Design assumptions regarding the geometrical, kinematic and driving characteristics of the machine are described. The functional model as well as its physical implementation as a research stand are presented. The production phases of the 3D knitted fabric are also demonstrated. The research results are described and their importance for the construction of a machine prototype of the production version are emphasised.

PL

W artykule opisano konstrukcję i badania modelu funkcjonalnego innowacyjnej osnowarki do technicznych dzianin przestrzennych o oryginalnej strukturze. Przedstawiono założenia projektowe dotyczące geometrii, kinematyki i napędów maszyny. Zaprezentowano projekt modelu funkcjonalnego oraz jego fizyczną realizację jako stanowiska badawczego. Opisano fazy tworzenia dzianiny 3D. Przedstawiono wyniki badań oraz podkreślono ich znaczenie dla budowy prototypu maszyny w wersji produkcyjnej.

15

Cattaneo-christov heat flux on an MHD 3D free convection casson fluid flow over a stretching sheet

Shankar D. Gowri, Raju C.S.K., Kumar M.S. Jagadeesh, Makinde Oluwole Daniel

Engineering Transactions

|

2020

|

Vol. 68, iss. 3

223--238

EN

In this investigation, we analyze the magnetohydrodynamic (MHD) three-dimensional (3D) flow of Casson fluid over a stretching sheet using non-Darcy porous medium with heat source/sink. We also consider the Cattaneo-Christov heat flux and Joule effect. The governing partial differential equations (PDEs) are transformed into ordinary differential equations (ODEs) using suitable transformations and solved by using the shooting technique. The effects of the non-dimensional governing parameters on velocity and temperature profiles are discussed with the graphs. Also, the skin friction coefficient and Nusselt number are discussed through tables. We also validate our results with the ones already available in the literature. It is found that the obtained results are in excellent agreement with the existing studies under some special cases. Our analysis reveals that the thermal relaxation parameter reduces the temperature field for the Newtonian and non-Newtonian fluid cases. It is also found that the temperature profile is decreased in the Newtonian fluid case when compared with the non-Newtonian fluid case.

16

The Study on Effects of Walking on the Thermal Properties of Clothing and Subjective Comfort

Špelić Ivana, Rogale Dubravko, Mihelić Bogdanić Alka

Autex Research Journal

|

2020

|

Vol. 20, no. 3

228--243

EN

Former studies done by other authors investigated the first- and second-layered air gaps beneath the clothing garments. None of the previous studies reported multidisciplinary clothing design testing approach linking both the objective measuring methods and subjective responses, while testing the thermal properties linked to a microclimatic volume formed between the layers of garments forming the ensemble. Neither was determined the limiting value of the microclimatic volume for outerwear garments, after which the thermal insulation will start to decrease due to convection. By taking the advantage of the precise three-dimensional (3D) body scanning technology and reverse engineering 3D CAD tool, the volume of the microclimatic air layers formed under outerwear garments was determined to study the impact of the ensemble’s microclimatic volume on the overall insulation value, measured by means of the thermal manikin. The jacket with the smaller microclimatic volume provided 5.2–13.5% less insulation than wider jackets, while the ensembles with tighter jackets showed 0.74–1.9% less insulation in static and 0.9–2.7% more insulation in dynamic conditions, thus proving that the limiting value of the microclimatic volume is greater than previously reported for three-layered ensembles. The effective thermal insulation value was reduced in average by 20.98–25.34% between standing and moving manikins. The thermal manikins are designed for steady-state measurements and do not work well under transient conditions, so three human subjects were employed as evaluators of the clothing thermal quality. In cooler climatic conditions, the measured physiological parameters and subjects’ grades pointed to discomfort while wearing ensembles with tighter jackets.

17

Three dimensional magnetotelluric inversion using L BFGS

Lu Libin, Wang Kunpeng, Tan Handong, Li Qingkun

Acta Geophysica

|

2020

|

Vol. 68, no. 4

1049--1066

EN

The gradient-based optimization methods are preferable for the large-scale three-dimensional (3D) magnetotelluric (MT) inverse problem. Compared with the popular nonlinear conjugate gradient (NLCG) method, however, the limited-memory Broyden–Fletcher–Goldfarb–Shanno (L-BFGS) method is less adopted. This paper aims to implement a L-BFGS-based inversion algorithm for the 3D MT problem. And we develop our code on top of the ModEM package, which is highly extensible and popular among the MT community. To accelerate the convergence speed, the preconditioning technique by the afne linear transformation of the original model parameters is used. Two modifcations of the conventional L-BFGS algorithm are also made to get a comparable convergence rate with the NLCG method. The impacts of the preconditioner parameters, the regularization parameters, the starting model, etc., on the inversion are evaluated by synthetic examples for both L-BFGS and NLCG methods. And the real MT Kayabe dataset is also inverted by the inversion algorithms. The synthetic tests show that through our L-BFGS inversion algorithm the similar resistivity models can be obtained with that from the NLCG method. For the real data inversion, the L-BFGS method performs more efciently and reasonable results could be obtained by less iterations of the inversion process than the NLCG method. Thus, we suggest the common usage of the L-BFGS method for the 3D MT inverse problem.

18

Analiza zawodności ochrony odgromowej w ujęciu przestrzennym

Pacoń Radosław, Benesz Mariusz

Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

|

2019

|

Nr 68

41--44

PL

Możliwość identyfikacji narażeń napięciowych układów izolacyjnych znacząco wpływa na efektywność w koordynacji izolacji, co z kolei wpływa na zwiększenie niezawodności w przesyle i rozdziale energii elektrycznej. W artykule poruszono jeden z możliwych scenariuszy narażeń napięciowych w napowietrznych liniach elektroenergetycznych związany z zawodnością ochrony odgromowej. Ważne znaczenie w zachowaniu ochrony odgrywa ukształtowanie terenu, które może mieć pozytywny jak i negatywny wpływ na ochronę przed bezpośrednimi wyładowaniami atmosferycznymi. Rezultatem pracy jest określenie charakterystycznych wartości szczytowych prądu wyładowania atmosferycznego IUBmax, powyżej których ochrona odgromowa jest zachowana. Obliczenia przeprowadzono w ujęciu przestrzennym dla typowej konstrukcji wsporczej serii B2 typu przelotowego i czterech przypadków ukształtowania powierzchni terenu.

EN

The ability to identify of overvoltage in insulation systems significantly affects the efficiency in the coordination of insulation, which increases the reliability of electrical power transmission and distribution systems. The purpose of the paper is to present the problems related to one of the possible scenarios of overvoltages caused by atmospheric discharge, which is shielding failure. In this scenario, despite the ground wires used, it is possible to direct hiss into the phase conductor by atmospheric discharge. Lightning protection conditions may be additionally affected by the lay of the land, which was checked in this paper. The result of the work is the determination of characteristic peak values of the lightning current IBUmax, above which lightning protection is maintained. Calculations were carried out for a typical B2 tower profile with different height and four cases taking into account different terrain.

19

LASERTEC 30 SLM 2nd Gen. Produkcja przyrostowa metodą selektywnego stapiania laserowego (SLM)

Świat Obrabiarek i Narzędzi

|

2019

|

R. 14, nr 3-4

8

20

Virtual Conservation-Restoration vs. actual Conservation-Restoration in the Conservation of fragmentary Artefacts: the case study frescoes from Sybaris-copia (Italy)

Muca Sokol

Ochrona Dziedzictwa Kulturowego

|

2019

|

Nr 8

211--222

EN

This article discusses the role that new digital technologies play on conservation-restoration of fragmentary artefacts. Above all, the use of these tools is essential in case the artefacts have lost the formal unity and reach us without documentation concerning their original position, as in the case of the Roman frescoes from Sybaris, object of this study. The creation of virtual models proves as fundamental for the material and formal recomposition of the artefacts, especially in the creation of a new support and display choices. This last aspect required an analysis on the effects that virtual reconstructions and augmented reality have on visitors.