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Wyświetlanie 1-10 z 560
Tytuł:
On orthogonally additive functions with orthogonally additive second iterate
Autorzy:
Baron, Karol
Tematy:
orthogonally additive and additive function, inner product space, iterate
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Wydawca:
Polskie Towarzystwo Matematyczne
Powiązania:
https://bibliotekanauki.pl/articles/745043.pdf  Link otwiera się w nowym oknie
Opis:
Let $\(E\) be a real inner product space of dimension at least 2. If \(f\) maps \(E\) onto \(E\) and both \(f\) and \(f \circ f \) are orthogonally additive, then \(f\) is additive.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The additive-subtractive process chain – a review
Autorzy:
Moehring, Hans-Christian
Maucher, Clemens
Becker, Dina
Stehle, Thomas
Eisseler, Rocco
Tematy:
additive manufacturing
additive-subtractive process chain
functional properties
material properties
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Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:
https://bibliotekanauki.pl/articles/2200258.pdf  Link otwiera się w nowym oknie
Opis:
In recent years, metal additive manufacturing developed intensively and became a relevant technology in industrial production of highly complex and function integrated parts. However, almost all additively manufactured parts must be post-processed in order to fulfil geometric tolerances, surface quality demands and the desired functional properties. Thus, additive manufacturing actually means the implementation of additive-subtractive process chains. Starting with the most relevant additive processes (powder-based PBF-LB, LMD-p and wire-based WAAM and LMD-w/WLAM), considering intermediate process steps (heat treatment and shot peening) and ending up with post-processing material removal processes (with defined and undefined cutting edges), this paper gives an overview of recent research findings with respect to a comprehensive scientific investigation of influences and interactions within the additive-subtractive process chain. This includes both the macroscopic geometric scale and the microscopic scale of the material structure. Finally, conclusions and future perspectives are derived and discussed.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-Efficiency Cooling System Using Additive Manufacturing
Autorzy:
Woo, Yeong-Jin
Nam, Dong-Ho
Lee, Seok-Rok
Kim, Eun-Ah
Lee, Woo-Jin
Yang, Dong-Yeol
Yu, Ji-Hun
Park, Yong-Ho
Lee, Hak-Sung
Tematy:
additive manufacturing
DfAM
Design for Additive Manufacturing
cooling system
lattice structure
simulation
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/2049198.pdf  Link otwiera się w nowym oknie
Opis:
In this study, we propose a cooling structure manufactured using a specialized three-dimensional (3D) printing design method. A cooling performance test system with complex geometry that used a thermoelectric module was manufactured using metal 3D printing. A test model was constructed by applying additive manufacturing simulation and computational fluid analysis techniques, and the correlation between each element and cooling efficiency was examined. in this study, the evaluation was conducted using a thermoelectric module base cooling efficiency measurement system. The contents were compared and analyzed by predicting the manufacturing possibility and cooling efficiency, through additive manufacturing simulation and computational fluid analysis techniques, respectively.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The potential of additive manufacturing of metal components to reduce environmental impacts
Autorzy:
Balidas, Antoine
Kerbrat, Olivier
Hascoet, Jean-Yves
Tematy:
additive manufacturing
WAAM
wire arc additive manufacturing
life cycle assessment
energy consumption
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Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:
https://bibliotekanauki.pl/articles/59124062.pdf  Link otwiera się w nowym oknie
Opis:
Additive manufacturing (AM) is used in metal part forming for its innovative character but its potential for sustainability is uncertain. The energy and material consumption required for manufacturing are significant. Thus, the research question of this article is: "What are the current uses of AM that present a real potential for reducing environmental impact?". The WAAM (Wire Arc Additive Manufacturing) process appears to be the most energy-efficient in comparison to other AM processes. A process parameters study shows that deposition rate has a substantial impact on energy consumption. This parameter represents the amount of material deposited in a unit of time and is directly linked to productivity. It appears that an increase of the deposition rate leads to a reduction in energy consumption. Experiments on WAAM with a high deposition rate permits to create a database of energy and material consumption. This database is then used to identify cases of parts made with WAAM that offer a significant impact reduction compared with conventional manufacturing processes.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of different composite mixtures (PLA/HA) manufactured with additive laser technology on the ability of S. aureus and P. aeruginosa to form biofilms
Autorzy:
Woźna, A. E.
Junka, A. F.
Szymczyk, A. E.
Tematy:
biomateriały
biofilm
biopolimery
bioceramika
biomaterials
prototype additive manufacturing biopolymers
bioceramic
prototype additive manufacturing
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Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/306425.pdf  Link otwiera się w nowym oknie
Opis:
Staphylococcus aureus (Gram-positive coccus) and Pseudomonas aeruginosa (Gram-negative bacterium) are the leading etiologic agents of biofilm-related, life-threatening infections in patients after orthopaedic implantations. The aim of the present paper is to estimate the ability of these two bacterial strains to form a biofilm on bioresorbable composites manufactured from polylactide (PLA) and hydroxyapatite (HA) with the use of Selective Laser Sintering (SLS) method. Methods: Microbiological tests were conducted on two variants of a solid specimen made with additive laser technology. Samples with different content of hydroxyapatite were made, with appropriate manufacturing parameters to ensure stability of both composite ingredients. The geometry of samples was obtained by technical computed tomography. Microbiological tests determined the number of bacterial cells after incubation. Results: The results indicate significantly decreased ability of S. aureus and P. aeruginosa to form biofilms on the surface of materials with higher content of hydroxyapatite ceramics. Conclusions: The data may be useful for future applications of SLS technology in the production of bioresorbable PLA/HA medical implants
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coating of LiBH4 and Its Effect on the Decomposition of RDX and AP
Autorzy:
Ding, X.
Shu, Y.
Chen, Z.
Liu, N.
Gou, B.
Zhang, J.
Wu, M.
Xie, G.
Dang, T.
Tematy:
coating
hydride
additive
hygroscopicity
DSC
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Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:
https://bibliotekanauki.pl/articles/358086.pdf  Link otwiera się w nowym oknie
Opis:
The novel fuel additive LiBH4 was introduced as an energetic component for its outstanding hydrogen content, perfect burning performance and high reactivity. In order to limit the hygroscopicity and to improve the stability in the air, LiBH4 was coated on the surface with wax and polyester carbonate. The final product was characterized by scanning electron microscopy (SEM), X-ray photoelectron energy spectroscopy (XPS) and Raman spectroscopy, while the stability in air was investigated by regular checking of variations in weight. The results show that a uniform coating layer was formed on the surface of the LiBH4, and the coverage was estimated from the boron content as approximately 82%. A healing effect was confirmed on defective surfaces exposed to air; the coating layer improves the relative stability by 50.7%. Furthermore, LiBH4 as an additive to promote the thermal decomposition of 1,3,5-trinitro-1,3,5-trazinane (RDX) and ammonium perchlorate (AP) was explored by differential scanning calorimetry (DSC), in which the catalytic effects of pure LiBH4 and coated LiBH4 were compared, and indicated that the coating does not decrease the reactivity of LiBH4. It is suggested that surface coating with some inert materials is a simple and effective method for improving the storage and performance of LiBH4, while ensuring its reactivity.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rapid Prototyping: Technologies, Materials and Advances
Autorzy:
Dudek, P.
Rapacz-Kmita, A.
Tematy:
rapid prototyping
additive manufacturing
composites
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Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:
https://bibliotekanauki.pl/articles/355282.pdf  Link otwiera się w nowym oknie
Opis:
In the context of product development, the term rapid prototyping (RP) is widely used to describe technologies which create physical prototypes directly from digital data. Recently, this technology has become one of the fastest-growing methods of manufacturing parts. The paper provides brief notes on the creation of composites using RP methods, such as stereolithography, selective laser sintering or melting, laminated object modelling, fused deposition modelling or three-dimensional printing. The emphasis of this work is on the methodology of composite fabrication and the variety of materials used in these technologies.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection-based heritability of resistance to Pythium ultimum in safflower
Autorzy:
Nikmanesh, Elham
Pahlevani, Mohammadhadi
Razavi, Seyed Esmaeil
Tematy:
additive
emergence
genotype
seed
zoospore
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Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Powiązania:
https://bibliotekanauki.pl/articles/2199691.pdf  Link otwiera się w nowym oknie
Opis:
Damping-off disease caused by Pythium ultimum can kill both germinating seeds and young seedlings and cause considerable damage in safflower cultivation. An estimation of heritability lets safflower breeders determine the most effective method for improving seedling emergence in soils  infected  with P. ultimum, the causal agent of seed rot and damping-off. Two cycles of selection were performed to estimate the realized heritability of resistance to the pathogen in five safflower populations. Undamaged seedlings were selected as resistant individuals and were kept to produce seed. The results showed that selection for two consecutive generations increased the emergence of seedlings in Pythium-infected soil from 46 to 53 %. The heritability estimates varied between 1.72 and 77.66 % over the genotypes and environments, in inverse proportion to the severity of the disease. Estimates of heritabilities showed that genes conferring resistance to P. ultimum in safflower are highly heritable and would respond to selection breeding, particularly in some of the studied genotypes, like Isfahan and Zarghan259. However,  different breeding methods must be explored for other genotypes.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 560

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