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Tytuł:
On orthogonally additive functions with orthogonally additive second iterate
Autorzy:
Baron, Karol
Powiązania:
https://bibliotekanauki.pl/articles/745043.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
orthogonally additive and additive function, inner product space, iterate
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.
Źródło:
Commentationes Mathematicae; 2013, 53, 2
0373-8299
Pojawia się w:
Commentationes Mathematicae
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
Powiązania:
https://bibliotekanauki.pl/articles/2200258.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
additive manufacturing
additive-subtractive process chain
functional properties
material properties
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.
Źródło:
Journal of Machine Engineering; 2023, 23, 1; 5--35
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
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
Powiązania:
https://bibliotekanauki.pl/articles/2049198.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
additive manufacturing
DfAM
Design for Additive Manufacturing
cooling system
lattice structure
simulation
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.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 689-693
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
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.
Powiązania:
https://bibliotekanauki.pl/articles/358086.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
coating
hydride
additive
hygroscopicity
DSC
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.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 1; 134-151
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rapid Prototyping: Technologies, Materials and Advances
Autorzy:
Dudek, P.
Rapacz-Kmita, A.
Powiązania:
https://bibliotekanauki.pl/articles/355282.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rapid prototyping
additive manufacturing
composites
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.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 891-896
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
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.
Powiązania:
https://bibliotekanauki.pl/articles/306425.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
biomateriały
biofilm
biopolimery
bioceramika
biomaterials
prototype additive manufacturing biopolymers
bioceramic
prototype additive manufacturing
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
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 3; 101-106
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection-based heritability of resistance to Pythium ultimum in safflower
Autorzy:
Nikmanesh, Elham
Pahlevani, Mohammadhadi
Razavi, Seyed Esmaeil
Powiązania:
https://bibliotekanauki.pl/articles/2199691.pdf
Data publikacji:
2012-08-20
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
additive
emergence
genotype
seed
zoospore
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.
Źródło:
Plant Breeding and Seed Science; 2012, 66; 109-118
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
STR zdań z partykułami dodającymi
TRS of sentences containing additive particles
Autorzy:
Kisiel, Anna
Powiązania:
https://bibliotekanauki.pl/articles/568146.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Mikołaja Kopernika w Toruniu. Wydawnictwo UMK
Tematy:
particle
prepositional expression
contextuality
additive index
Opis:
The author discusses Ewa Walusiak's proposal to distinguish three homogenous and synonymous language units belonging to three groups: prepositions, particles and conjunctions. It is argued that the criteria used by Walusiak do not allow for clear differentiation of the three groups. Therefore the author suggests an opposite hypothesis to be true: all of the language units in question belong to one and only one group of particles. The final part of the article is devoted to a preliminary semantic distinction between na dodatek, w dodatku, na dobitkę, na dobitek, na dokładkę and na domiar złego.
Źródło:
Linguistica Copernicana; 2012, 1(7); 139-151
2080-1068
2391-7768
Pojawia się w:
Linguistica Copernicana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizacija sostava betona dlja tekhnologicheskojj linii "Tehnsiland"
Optimization of the process for concrete line "Tensiland"
Autorzy:
Dmitriev, A.
Powiązania:
https://bibliotekanauki.pl/articles/76936.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
cement
concrete
strength
additive
composition
optimization
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 5
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of various additives on the chemical composition, fermentation parameters and apparent digestibility of Virginia fanpetals silage in sheep
Autorzy:
Starczewski, M.
Purwin, C.
Borsuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1192511.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
Virginia fanpetals
silage additive
apparent digestibility
Opis:
The aim of this study was to determine the effect of various additives (straw, grass, molasses, dried sugar beet pulp – pellets, inoculant, organic acids) on the quality and fermentation profile of Virginia fanpetals (Sida hermaphrodita L.) silage. Silage samples were assayed for the content of dry matter – DM, crude ash, crude protein – CP, water soluble carbohydrates – WSC, neutral detergent fiber – NDF, acid detergent fiber – ADF and acid detergent lignin – ADL as well as pH and the concentrations of ammonia nitrogen, lactic acid, acetic acid and butyric acid. Silage quality was evaluated according to the DLG Key. Apparent digestibility was determined in sheep, and the digestibility coefficients of DM, CP, NDF, organic matter – OM and digestible OM were calculated. The tested additives increased DM, decreased ADL content (P≤0.01), and reduced WSC utilization (P≤0.05, P≤0.01) in silages. Only sugar beet pulp decreased the content of NDF and ADF (P≤0.01). All silages had similar pH values (4.01 - 4.10). The analyzed silages were characterized by intense lactic acid fermentation, which was inhibited only by the grass additive (P≤0.01). All additives suppressed acetic acid fermentation (P≤0.05, P≤0.01). Grass and sugar beet pulp significantly decreased the concentration of butyric acid (P≤0.01). The addition of grass decreased CP digestibility (from 92.1% in the control silage to 89.3%), whereas the addition of a bacterial inoculant (P≤0.01) and a blend of organic acids (P≤0.05) increased CP digestibility to 93.8% and 92.8%, respectively. The addition of grass and sugar beet pulp increased the coefficient of NDF digestibility by 6 percentage points relative to 60.9% in the control silage. The addition of the inoculant and organic acids decreased NDF digestibility to 56.0% and 50.5%, respectively. Dried sugar beet pulp was the most effective additive, which positively affected the chemical composition, fermentation profile and apparent digestibility of Sida silage.
Źródło:
Journal of Elementology; 2020, 25, 4; 1499-1508
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topology optimization of structures with stress and additive manufacturing constraints
Autorzy:
Fiuk, Grzegorz
Mrzygłód, Mirosław
Powiązania:
https://bibliotekanauki.pl/articles/1839646.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
topology optimization
manufacturing constraint
additive manufacturing
Opis:
The paper presents a new methodology dedicated to design for additive manufacturing. Based on a hybrid algorithm of topological optimization, the method enables application of advanced constraints and validates solutions “on the fly” using virtual prototyping. Advanced constraints consider the influence of directions of additive manufacturing as well as the equivalent stress. In the optimization framework, real material properties related to three manufacturing directions were considered. The new design methodology is illustrated by benchmark tests and examples of wrist-hand orthosis topology optimization in which stress and manufacturing constraints were taken into account. As demonstrated by the conducted comparison tests with available commercial tools, the solutions obtained with the new method were characterized by lower mass and shorter computation time.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 2; 459-468
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prototyping of individual ankle orthosis using additive manufacturing technologies
Autorzy:
Wierzbicka, N.
Górski, F.
Wichniarek, R.
Kuczko, W.
Powiązania:
https://bibliotekanauki.pl/articles/102907.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
ankle orthosis
additive manufacturing
reverse engineering
Opis:
The paper presents design and manufacturing process of an individualized ankle orthosis using additive manufacturing technologies and reverse engineering. Conventional processes of manufacturing of orthoses are expensive and time consuming Thus, an alternative method was proposed. The patient’s leg was 3D scanned and the orthosis was designed using a CAD system. It was then manufactured using the Fused Deposition Modelling technology, assembled and fully tested. Positive results were obtained.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 3; 283-288
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potassium multiphosphates for food processing
Autorzy:
Cichy, B.
Folek, S.
Makała, H.
Powiązania:
https://bibliotekanauki.pl/articles/777875.pdf
Data publikacji:
2007
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
dodatki spożywcze
wielofosforany
food additive
multiphosphate
Opis:
The paper discusses the results of research on the preparation of food grade potassium di- and triphosphates and the application thereof as multiphosphate ingredients of functional additives for meat processing. The research on the process of potassium multiphosphate manufacture was performed with the use of equipment corresponding to that used on an industrial scale, facilitating thereby the transfer of the process conditions to a commercial level. The aim of the work was to obtain potassium di- and triphosphate products readily soluble in water and NaCl solutions, determination of optimum parameters of the manufacturing processes, and an application of the products obtained along with sodium multiphosphates in functional phosphate additives for selected meat products. The research presented here is part of an on-going project.
Źródło:
Polish Journal of Chemical Technology; 2007, 9, 3; 86-90
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interests of 5 axis toolpaths generation for Wire Arc Additive Manufacturing of aluminum alloys
Autorzy:
Hascoët, J.-Y.
Querard, V.
Rauch, M.
Powiązania:
https://bibliotekanauki.pl/articles/99951.pdf
Data publikacji:
2017
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
additive manufacturing
5 axis manufacturing
WAAM
Opis:
Additive Manufacturing (AM) for metal part can be divided into two different types: The powder technology and the wire technology. Usually, powder is adapted for fine components and small parts whereas wire is used for structural components and large scale part. One of the main benefits of AM is to simplify assemblies by reducing the number of components and to provide a large freedom of design. A standard AM system consists of a combination of three blocks: a motion system, a heat source and a feedstock. For Wire Arc Additive Manufacturing (WAAM), the heat source is a welding generator and the feedstock is a wire. The motion system generally used is a 6 axis robot or a CNC machine. This paper aims to propose a methodology to generate 5 axis toolpaths for WAAM and highlight the main parameters which selection is a key issue to resolve. The goal is to compare 3 axis and 5 axis toolpaths on part accuracy, depending the clearance angle of the part.
Źródło:
Journal of Machine Engineering; 2017, 17, 3; 51-65
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
THE DIVERSITY OF EUROPEAN UNION COUNTRIES ACCORDING TO EQUIPMENT WITH AGRICULTURAL TRACTORS
Autorzy:
Badach, Elżbieta
Luty, Lidia
Zioło, Monika
Žukovskis, Jan
Powiązania:
https://bibliotekanauki.pl/articles/453778.pdf
Data publikacji:
2017
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
agricultural tractors
European Union
additive structures
Opis:
The research of taxonomic structure of holdings owning agricultural tractors in EU countries was conducted on the basis of statistical information from EUROSTAT database, for 2013 year. The purpose of this article was to present level of equipment of holdings in European Union countries in agricultural tractors in the spatial aspect. The method of vector elimination was used in the analysis. Apart from the analysis concerning the fact of the possession of agricultural tractors according to areal groups of arable land in the European countries, the groups of countries with similar structure were distinguished. Percentage of holdings possessing tractors was related with the number of holdings in each groups of areal groups of arable land.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2017, 18, 3; 399-407
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of the shape accuracy of parts fabricated by means of FLM process using FEM simulations
Autorzy:
Möhring, H.-Christian
Stehle, Thomas
Maucher, Clemens
Becker, Dina
Braun, Steffen
Powiązania:
https://bibliotekanauki.pl/articles/99674.pdf
Data publikacji:
2019
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
additive manufacturing
FLM-simulation
shape accuracy
Opis:
The prediction of component properties from the Additive manufacturing (AM) process poses a challenge. Therefore, this paper presents the development of a novel machine data (G-Code) based procedure as well as its programming implementation of a process simulation in ANSYS Mechanical for the fused layer modelling (FLM) process. For this purpose, an investigation of additively produced components with varying parameters made of polylactic acid (PLA) is carried out and simulated by means of the developed method. Application of the developed method makes it possible to predict the thermally induced distortion of PLA-Parts based on the machine data from the FLM process before production.
Źródło:
Journal of Machine Engineering; 2019, 19, 1; 114-127
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the addition of mixture of plant components on the mechanical properties of wheat bread
Autorzy:
Wójcik, Monika
Dziki, Dariusz
Biernacka, Beata
Różyło, Renata
Miś, Antoni
H. Hassoon, Waleed
Powiązania:
https://bibliotekanauki.pl/articles/972789.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
mechanical properties
bread
quality
plant
additive
Opis:
Instrumental methods of measuring the mechanical properties of bread can be used to determine changes in the properties of it during storage, as well as to determine the effect of various additives on the bread texture. The aim of this study was to investigate the effect of the mixture of plant components on the physical properties of wheat bread. In particular, the mechanical properties of the crumb and crust were studied. A sensory evaluation of the end product was also performed. The mixture of plant components included: carob fiber, milled grain red quinoa and black oat (1:2:2) – added at 0, 5, 10, 15, 20, 25 % – into wheat flour. The results showed that the increase of the addition of the proposed additive significantly increased the water absorption of flour mixtures. Moreover, the use of the mixture of plant components above 5% resulted in the increase of bread volume and decrease of crumb density. Furthermore, the addition of the mixture of plant components significantly affected the mechanical properties of bread crumb. The hardness of crumb also decreased as a result of the mixture of plant components addition. The highest cohesiveness was obtained for bread with 10% of additive and the lowest for bread with 25% of mixture of plant components. Most importantly, the enrichment of wheat flour with the mixture of plant components significantly reduced the crust failure force and crust failure work. The results of sensory evaluation showed that the addition of the mixture of plant components of up to 10% had little effect on bread quality.
Źródło:
International Agrophysics; 2017, 31, 4; 563-569
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New aspects of 3D printing by robots
Autorzy:
Wypysiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/132124.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
additive technologies
3D printing
robot
Opis:
Additive technologies are common field of industry and daily life. Almost everyone heard about 3D printing and rapid prototyping technologies. Dynamic evolution of methods gives us new possibilities and open new chances. Let’s look on 3D robot printing, its limitation and advantages.
Źródło:
Advanced Technologies in Mechanics; 2016, 3, no. 2 (7); 17-21
2392-0327
Pojawia się w:
Advanced Technologies in Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Additives on Maximizing Petrol Production from Crude Oil and Investigation of Properties
Autorzy:
Ashaduzzaman, Md.
Miah Yunus, Md.
Powiązania:
https://bibliotekanauki.pl/articles/412104.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
petrol
crude oil
additive
quality
mechanism
Opis:
The objectives of this work were concentrated to investigate the enhancement of petrol distillate production from crude oil after treating with two additives. Attempts were also made to find out the mechanisms, those are responsible for enhancing the quantity and quality of petrol from crude oil by straight run refining process. From this study, it has been illustrated that the yield of petrol was directly proportional to the lubricating oil and inversely proportional to the bitumen asphalt content in the hydrocarbon mixture influenced by both physical and chemical reasons. The yield of petrol was increased ca. 4% (w/w) when 0.25% (w/w) additive-1 was used for blending before distillation. The physical properties of distillate petrol product were studied as well as the chemical quality was determined by TGA, 1H- NMR and GC-MS photometer.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 6; 6-16
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the support structure on the bandsawing process when separating lpbf components from the building platform
Autorzy:
Moehring, Hans-Christian
Becker, Dina
Maucher, Clemens
Eisseler, Rocco
Ringger, Jonas
Powiązania:
https://bibliotekanauki.pl/articles/2142352.pdf
Data publikacji:
2022
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
additive manufacturing
LPBF process
cutting process
Opis:
The method of laser powder bed fusion (LPBF) is an additive manufacturing process and allows great freedom of component geometry due to the layer-by-layer structure. The LPBF components are printed on a substrate plate and must be separated from the plate afterwards. Support structures are used to attach LPBF components to the substrate plate and to sustain overhanging parts. The cutting of the components is mainly carried out by means of a sawing process using the support structure. The forces occurring during this process are very challenging because the component has to be cut off without damage or deformation. The present study investigates and discusses the resultant forces and vibrations during the sawing of LPBF components made of titanium alloy Ti6Al4V using two different support structures. The components were arranged on the substrate plate at angles of 0°, 5°, 10°, 15°, 45° and 90° to the direction of primary motion.
Źródło:
Journal of Machine Engineering; 2022, 22, 3; 19--30
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Opening new opportunities for aeronautic, naval and train large components realization with hybrid and twin manufacturing
Autorzy:
Rauch, Matthieu
Hascoet, Jean-Yves
Powiązania:
https://bibliotekanauki.pl/articles/2171769.pdf
Data publikacji:
2022
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
additive manufacturing
hybrid manufacturing
twin manufacturing
Opis:
Additive Manufacturing (AM) consist in producing parts by depositing material in successive layers. These step-by-step processes proposes new innovative directions for high value components: complex geometries are accessible without strong efforts (such as hollow or lattice structures which dramatically reduce the component weight while keeping their at least similar mechanical properties), assemblies can be simplified, spare parts can be realized at demand... Hence, AM has benefitted from large research efforts over the last decade, almost all existing industrial sectors have benefitted from them. This paper introduces some opportunities and the associated challenges attached to Additive Manufacturing, to produce large metallic components for naval aeronautics and train industries. In particular, two innovative approaches are discussed in details: hybrid manufacturing and twin manufacturing. Hybrid manufacturing consists in integrating AM together with other processes for the realization of components, with the objective to benefit from the interests of each process while avoiding its drawbacks. Hence, AM can realize complex geometries or offer low buy-to-fly ratios while high speed machining generates very good surface properties (position, roughness). Processes can be carried out sequentially or simultaneously on the features to manufacture and finding the optimal manufacturing work plan can be challenging. The paper introduces some hybrid approaches developed in the laboratory. Twin manufacturing uses models and multiphysics simulation methods to create a digital clone of the process implementation within the manufacturing environment. Manufacturing preparation and optimization can be carried in the virtual workshop where various configurations and choices can be tested before being selected. To enhance its accuracy, the digital twin can also be fed by monitoring data captured during the process. Several digital twins developed in the laboratory are provided. The paper is illustrated with several proof-of-concept parts made with SLM, LMD, WAAM and hybrid approaches in the laboratory. Among them, a hollow propellers that has the same hydrodynamics efficiency for a reduced weight for the naval industry, an aircraft structural panel that demonstrates simplified assemblies increased performance/mass ratio, a train component that shows the ability to produce structural parts at demand.
Źródło:
Journal of Machine Engineering; 2022, 22, 4; 5--20
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-additive genetic effects in animal selection
Autorzy:
Lukaszewicz, M
Powiązania:
https://bibliotekanauki.pl/articles/2048300.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pure breed
epistasis
dominance effect
crossbreed
animal selection
non-additive genetic effect
additive effect
farm animal
Źródło:
Journal of Applied Genetics; 2001, 42, 4; 467-478
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Process of Manufacturing Transparent Models of Anatomical Structures
Autorzy:
Wojnarowska, Wiktoria
Nieroda, Maciej
Gładysz, Ewelina
Miechowicz, Sławomir
Kudasik, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/176131.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
3D printing
medical applications
additive manufacturing
Opis:
In recent years, a rapid increase in the use of three-dimensional (3D) printing technologies in medicine, especially in the manufacturing of the diagnostic models, can be observed. In some cases, there is a need to fabricate transparent models that allow visualization of internal structures of the object. Unfortunately, techniques used to manufacture such models are often very expensive and time-consuming. The above-mentioned issues were the motivation for developing a new method of fabrication transparent models for visualization of internal structures for planning surgical treatments. This paper presents the process of making transparent models using the newly developed method – the stacked layers method. In order to compare this new method and one of the most common 3D printing technologies – fused deposition modeling (FDM) – the models for two medical cases using both of these methods were fabricated. As a result of this work, it can be concluded that the stacked layers method provides faster and cheaper way of making transparent medical models. The main features of fabrication process that have a huge impact on quality of the models made by new method were pointed. The results of this study suggest that models fabricated with the use of this method can be useful as a diagnostic tool in medical applications for planning surgical treatments.
Źródło:
Advances in Manufacturing Science and Technology; 2020, 44, 2; 62-66
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A descriptive, additive modification of Mawhins integral and the Divergence Theorem with singularities
Autorzy:
Nonnenmacher, Dirk
Powiązania:
https://bibliotekanauki.pl/articles/1311753.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Mawhin's integral
additive interval function
divergence theorem
Opis:
Modifying Mawhin's definition of the GP-integral we define a well-behaved integral over n-dimensional compact intervals. While its starting definition is of Riemann type, we also establish an equivalent descriptive definition involving characteristic null conditions. This characterization is then used to obtain a quite general form of the divergence theorem.
Źródło:
Annales Polonici Mathematici; 1994, 59, 1; 85-98
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 451

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