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Wyświetlanie 1-25 z 3485
Tytuł:
Balancing Bilinearly Interfering Elements
Autorzy:
Carfì, D.
Gambarelli, G.
Powiązania:
https://bibliotekanauki.pl/articles/375967.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
bargaining problems
game theory
antagonist elements
interfering elements
optimal dosage
synergies
Opis:
Many decisions in various fields of application have to take into account the joint effects of two elements that can interfere with each other. This happens, for example, in Medicine (synergic or antagonistic drugs), Agriculture (anti-cryptogamics), Public Economics (interfering economic policies), Industrial Economics (where the demand of an asset can be influenced by the supply of another asset), Zootechnics, and so on. When it is necessary to decide about the dosage of such elements, there is sometimes a primary interest for one effect rather than another; more precisely, it may be of interest that the effects of an element are in a certain proportion with respect to the effects of the other. It may also be necessary to take into account minimum quantities that must be assigned. In Carfì, Gambarelli and Uristani (2013), a mathematical model was proposed to solve the above problem in its exact form. In this paper, we present a solution in closed form for the case in which the function of the effects is bilinear.
Źródło:
Decision Making in Manufacturing and Services; 2015, 9, 1; 27-49
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sur les elements bornants et les ideaux formes delements bornants joints dans les algebres bornologiques
Autorzy:
Zinedine, Ahmed
Tajmouati, Abdelaziz
Powiązania:
https://bibliotekanauki.pl/articles/746663.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
permanently singular elements, bounding elements, non-removable ideals, ideals consisting of joint bounding elements
Opis:
Bounding elements and ideals consisting of joint bounding elements were essential tools in the study of permanent singularity in the class of all bornological algebras ([1], [6], [7], [8] and [12]). In this paper we give some important properties of these two notions. Especially, we compare boundings elements with some similar known notions such as bornological divisors of zero and topological divisors of zero. Then we show that these elements can be seen as algebraic divisor of zero in some suitable extension of the initial algebra. This result is analogous to a well-known result of Żelazko [11] concerning topological divisors of zero in Banach algebras. Finaly, we show that a maximal ideal is a prime ideal among ideals consisting of joint bounding elements. This is analougous to the result given in [4] concerning ideals consisting of joint topological divisors of zero in the case of Banach algebras.
Źródło:
Commentationes Mathematicae; 2013, 53, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sulfur in railway elements
Autorzy:
Mikłaszewicz, I.
Czarnecki, M.
Powiązania:
https://bibliotekanauki.pl/articles/215627.pdf
Data publikacji:
2018
Wydawca:
Instytut Kolejnictwa
Tematy:
sulfur
Baumann test
railway elements
Opis:
The article presents the influence of sulfur as a harmful chemical element in railway elements working under load. The Baumann test shows the segregation of sulfur in the cross-section of the wheelset axle pivot, rail, wheel tyre and coupling elements. The tests were carried out in accordance with the standards PN-87/H-05414, ISO 4968:1979, PN EN 13674-1 + A1:2017, PN EN 13261: 2011, PN-84/H-84027/06, PN-EN 10083-3: 2006 and PN-EN 15566:2016-11, which require the determination of sulfur content and its distribution in those elements.
Źródło:
Problemy Kolejnictwa; 2018, 180; 101-104
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Banach *-algebras generated by semicircular elements induced by certain orthogonal projections
Autorzy:
Cho, I.
Jorgensen, P. E. T.
Powiązania:
https://bibliotekanauki.pl/articles/256025.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
free probability
orthogonal projections
weighted-semicircular elements
semicircular elements
Opis:
The main purpose of this paper is to study structure theorems of Banach *-algebras generated by semicircular elements. In particular, we are interested in the cases where given semicircular elements are induced by orthogonal projections in a C*-probability space.
Źródło:
Opuscula Mathematica; 2018, 38, 4; 501-535
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pre-assembly for FEM 2D non-curvilinear quadrilateral Lagrangian elements
Autorzy:
Sowa, M.
Typańska, D.
Powiązania:
https://bibliotekanauki.pl/articles/97541.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
pre-assembly
finite element method
higher order elements
quadrilateral Lagrangian elements
Opis:
The paper concerns an idea of preparing auxiliary equations and data for the finite element method assembly. This is made for a specific element type and element order and is referred to as the pre-assembly. Most importantly the prepared auxiliary equations require that only the element’s placement (coordinates) needs to be known, while the remaining coefficients that are required are stored in data sheets. The pre-assembly allows programmers who implement the FEM to significantly reduce the effort put into the assembly algorithm through its replacement by a few simple equations and the application of the prepared data. These data sheets can be prepared and can be utilized by FEM programmers. The construction of these data sheets for non-curvilinear quadrilateral Lagrangian elements (of any selected order) is explained in this paper.
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 106-119
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytoextraction of rare earth elements
Autorzy:
Gmur, Dominika
Siebielec, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2143646.pdf
Data publikacji:
2022-09
Wydawca:
Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy
Tematy:
rare earth elements
phytoextraction
hyperaccumulation
environmental remediation
Opis:
Rare earth elements (REE) are a group of 17 elements with similar physicochemical properties. Most of the world’s REE extraction belongs to China. Due to the growing demand for REE and limited resources, the European Commission has identified REE as critical materials. On the other hand, little is known so far about the possible effects of long-term exposure of living organisms and the ecosystem to REE. Therefore, potential solutions for the recovery of distributed REE are being sought. Phytoextraction is a method that allows the recovery of elements from the environment. For this purpose, two strategies are gener- ally used: the use of plants with the natural ability to accumulate REE (hyperaccumulators) and the support of the process through the use of chelators. Twenty two species have been identified as REE hyperaccumulators, e.g. Phytolacca americana, Dicranop- teris linearis, Blechnum niponicum or Carya tomentosa. For the total REE, an accumulation limit of 100 mg kg-1 dry weight was established. Natural chelators are used as additives, e.g. humic acids or low molecular weight acids, as well as synthetic ones: EDTA or EGTA. In addition, the efficiency of the process is also influenced by other factors, such as the sorption capacity of the soil, the content of organic matter in the soil or soil pH. The aim of this article is to present the plant species useful in REE phy- toextraction and the potential for enhancing the method with the use of chelators.
Źródło:
Polish Journal of Agronomy; 2022, 50; 3-11
2081-2787
Pojawia się w:
Polish Journal of Agronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertical distribution patterns of trace and major elements within soil profile in Lithuania
Autorzy:
Gregorauskiene, V.
Kadunas, V.
Powiązania:
https://bibliotekanauki.pl/articles/2058924.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Lithuania
complete soil profile
accumulative elements
removable elements
total element contents
variability
Opis:
The vertical distribution of the total contents assayed by Dc-Arc ES analysis of 28 trace elements and 6 major elements measured by ICP-MS within 53 complete soil profiles in Lithuania are presented. Models of the soil profiles were created, each having the master soil horizons A, E, B and C. Median values of elements in the master horizons of different texture were used in place of missing samples, while aberrant samples were discarded. The absolute average deviation () was taken to measure the variability of the data subsets and thus to check the reliability of location of the element contents within the soil profile. Within the context of the different actions of the various soil-forming processes (podzolization, lessivage, gleyfication, humification and so on) the general patterns of vertical element distribution were revealed. Element depletion is dominant in the soils of Lithuania. Themost easily removed are the alkaline elements Ca and Mg, while U, B, Th, As, Co, Cr, Sr, Y, Mo, La, Sc, Yb, Ti, P and K are depleted through the whole soil profile. Ag, Pb, Sn and Mn were defined as the accumulative elements in the surface A-horizon and might be influenced by anthropogenic or biogenic processes. A relative accumulation of Zr, Ba and Nb was observed in the surface A-horizon, and this seems to be related to the weathering of resistant minerals. Levels of Fe, Li, Al, V, Zn, Ga, Ni, Cu and Rb were ascribed to elements precipitated in the soil illuvial B-horizon due to soil formation processes. Na, K, Sr, B, U, As, Co Rb and Yb were found to be the most immobile elements within typical soil profiles, while Ag, Zn, Sc, Ba, Cu, Zr, Fe La, Th and Ca are themostmobile elements and affected by a variety of natural and human factors.
Źródło:
Geological Quarterly; 2006, 50, 2; 229-237
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Culture-bound elements: Rendering and preserving in translation
Autorzy:
Maksvytytė, Jūratė
Powiązania:
https://bibliotekanauki.pl/articles/1191841.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Wrocławski. Oficyna Wydawnicza ATUT – Wrocławskie Wydawnictwo Oświatowe
Tematy:
culture-bound elements
translation
strategies
rendering
preserving
Opis:
Each culture is unique and has its own unique objects or phenomena related to its history, traditions, and cultural identity. These specific objects, otherwise called culture-bound elements, may be strange and unrecognizable to another culture. Translators are often challenged to translate the text of one culture to another and to convey the names of cultural elements, while still preserving their unique meaning, as well as their national and cultural colour. The aim of the article is to analyse the strategies and techniques by means of which the names of Lithuanian culture-bound elements are translated into English in a work devoted to public affairs. To what extent the original is preserved in the foreign-language environment clarifies the (dis)harmony. In short, the name of a culture-bound element is an integral part of such work that otherwise would not accomplish its purpose.
Źródło:
Studia Translatorica; 2019, 10; 253-264
2084-3321
2657-4802
Pojawia się w:
Studia Translatorica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Okresowy układ pierwiastków chemicznych
Periodic system of chemical elements
Autorzy:
Rurarz, E.
Powiązania:
https://bibliotekanauki.pl/articles/214493.pdf
Data publikacji:
2018
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
okresowy układ pierwiastków chemicznych
pierwiastki promieniotwórcze
pierwiastki super ciężkie
Międzynarodowa Unia Chemii Czystej i Stosowanej
periodic system of chemical elements
radioactive elements
super heavy elements
International Union of Pure and Applied Chemistry
Opis:
W roku bieżącym przypada 120. rocznica odkrycia polonu i radu. Liczby atomowe tych pierwiastków to odpowiednio: Z= 84 i Z=88. Dziś znamy 118 pierwiastków. W artykule przypomniano ważniejsze fakty z historii odkrycia nowych pierwiastków i badania ich właściwości. Szczególną uwagę poświęcono pierwiastkom promieniotwórczym z obszaru liczb atomowych Z= 104 -118, które odkryto w ostatnich kilkudziesięciu latach. Autor artykułu zwraca uwagę na złożoność i ważność procedur decydujących o ustalaniu nazwy nowych pierwiastków.
In the current year is 120. anniversary of the discovery of polonium and radium. Atomic numbers of these elements is: Z = 84 and Z = 88. Today we know the 118 elements. The article pointed out important facts from the history of the discovery of new elements and study their properties. Particular attention was given to radioactive elements with atomic numbers Z = 104-118, which was discovered in recent decades. The author of the article draws attention to the complexity and validity procedures for determining the names of new elements.
Źródło:
Postępy Techniki Jądrowej; 2018, 2; 37-40
0551-6846
Pojawia się w:
Postępy Techniki Jądrowej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possibilities of recovery and separation of rare earth elements
Autorzy:
Fila, Dominika
Powiązania:
https://bibliotekanauki.pl/articles/2079965.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
rare earth elements
resources
recovery
separation
Opis:
Rare earth metals are a group of elements widely used in high technology products. They are included in the group of critical mineral resources for the EU economy. Rare earth elements are found in computers and mobile phones, as well as in low-emission energy technologies. They are also applied in chemical processes as catalysts in the oil refining. Some of them occur even in considerable quantities in the earth's crust but not very often in the concentrations justifying the profitability of their extraction. Additionally, the constantly growing demand and the current market situation cause that alternative resources of rare earth elements recovery are sought after. Therefore, the recovery and separation methods as well as recovery from the secondary sources are becoming more and more important. The following paper presents the possibilities of recovery and separation of rare earth elements from primary and secondary sources.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2018, 73, 1; 99-110
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustical Boundary Elements : Theory and Virtual Experiments
Autorzy:
Piscoya, R.
Ochmann, M.
Powiązania:
https://bibliotekanauki.pl/articles/178118.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
boundary elements
Green's functions
non-uniqueness
Opis:
This paper presents an overview of basic concepts, features and difficulties of the boundary element method (BEM) and examples of its application to exterior and interior problems. The basic concepts of the BEM are explained firstly, and different methods for treating the non-uniqueness problem are described. The application of the BEM to half-space problems is feasible by considering a Green’s Function that satisfies the boundary condition on the infinite plane. As a special interior problem, the sound field in an ultrasonic homogenizer is computed. A combination of the BEM and the finite element method (FEM) for treating the problem of acoustic-structure interaction is also described. Finally, variants of the BEM are presented, which can be applied to problems arising in flow acoustics.
Źródło:
Archives of Acoustics; 2014, 39, 4; 453-465
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minkowski difference and Sallee elements in an ordered semigroup
Autorzy:
Borowska, Danuta
Grzybowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/745931.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Minkowski difference
Sallee elements
semigroups
Opis:
In the manner of Pallaschke and Urbański ([5], chapter 3) we generalize the notions of the Minkowski difference and Sallee sets to a semigroup. Sallee set (see [7], definition of the family \(S\) on p. 2) is a compact convex subset \(A\) of a topological vector space \(X\) such that for all subsets \(B\) the Minkowski difference \(A -B\) of the sets \(A\) and \(B\) is a summand of \(A\). The family of Sallee sets characterizes the Minkowski subtraction, which is important to the arithmetic of compact convex sets (see [5]). Sallee polytopes are related to monotypic polytopes (see [4]). We generalize properties of Minkowski difference and Sallee sets to semigroup and investigate the families of Sallee elements in several specific semigroups.
Źródło:
Commentationes Mathematicae; 2007, 47, 1
0373-8299
Pojawia się w:
Commentationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semicircular elements induced by p-adic number fields
Autorzy:
Cho, I.
Jorgensen, P. E. T.
Powiązania:
https://bibliotekanauki.pl/articles/255340.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
free probability
primes
p-adic number fields Qp
Hilbert-space representations
C*-algebras
wighted-semicircular elements
semicircular elements
Opis:
In this paper, we study semicircular-like elements, and semicircular elements induced by p-adic analysis, for each prime p. Starting from a p-adic number field Qp, we construct a Banach *-algebra [formula], for a fixed prime p, and show the generating elements Qpj of [formula] form weighted-semicircular elements, and the corresponding scalar-multiples Θpj of Qpj become semicircular elements, for all j ∈ Z. The main result of this paper is the very construction of suitable linear functionals [formula] on [formula], making Qpj be weighted-semicircular, for all j ∈ Z.
Źródło:
Opuscula Mathematica; 2017, 37, 5; 665-703
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prognosis of environmental impact of trace elements from brown coal-fired power plant Bełchatów
Autorzy:
Konieczyński, J.
Komosiński, B.
Jabłońska, M.
Cieślik, E.
Powiązania:
https://bibliotekanauki.pl/articles/204574.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
environment protection
brown coal
trace elements
combustion products
fl ue gas desulphurization (FGD) gypsum
forecast of trace elements emission
forecast of trace elements transfer
Opis:
A forecast of the negative impact exerted on the environment by selected trace elements in "Bełchatów" Power Plant has been prepared on the basis of the results of investigations into these elements’ distribution carried out as part of earlier research on coal from “Bełchatów” Field and the data on updated analyses of the content of these elements in 55 brown coal samples from test boreholes. Work in "Bełchatów" Power Plant, which is supplied with coal from "Szczerców" Field, will be accompanied by trace elements transfer. On the basis of the conducted investigations it has been found that the biosphere is most threatened by mercury emissions. As shown by the presented results of analyses and calculations, the emissions of mercury in "Bełchatów" Power Plant are low. Mercury is accumulated chiefly in gypsum produced in the FGD plant. The content of mercury in slag and ash is low.
Źródło:
Archives of Environmental Protection; 2012, 38, 3; 59-72
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Territoire, espace, lieu : éléments pour une réflexion géocritique
Territory, space, place: elements for a geocritical reflexion
Autorzy:
Di Pasquale, Fabrizio
Powiązania:
https://bibliotekanauki.pl/articles/1627981.pdf
Data publikacji:
2018-03-01
Wydawca:
Uniwersytet Gdański. Wydawnictwo Uniwersytetu Gdańskiego
Opis:
This article proposes a reflection onto Geocriticism and its analysis tools, in order to highlight the importance of the literary text when creating the sense of space. The three concepts of territory, space and place will also be useful as analysis to reflect on the different ways of space representation in French literature and, in a small portion, European literature. Several authors have been considered, such as Honoré de Balzac, Gustave Flaubert, Jules Verne, René Barjavel, but also Miguel de Cervantes and Italo Calvino. As a method of interdisciplinary analysis, Geocriticism allows the diversification of perspectives in literature: a “multi‐focalisation” of places, a poly‐sensuous approach to places, a stratigraphic vision of places, and an intertextuality of places. This is why it does not gravitate around only one author or novel, but it concentrates in the referential dimension of fictional spaces.
Źródło:
Cahiers ERTA; 2018, 13; 9-21
2300-4681
Pojawia się w:
Cahiers ERTA
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-Performance Milling Techniques of Thin-Walled Elements
Autorzy:
Zawada-Michałowska, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/2201768.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
milling
HPC
HSC
thin-walled elements
aluminium alloy
Opis:
The paper presents an overview of high-performance milling techniques of thin-walled elements. Currently, the tendency to simplify semi-finished products is used in aviation. In that case even 95% of semi-finished product mass is converted into chips, hence the increasing interest in such technol-ogies as: High Performance Cutting and High Speed Cutting. The aim of the paper was to research high-performance milling techniques of thin-walled elements in reference to conventional machin-ing. The material was the EN AW-7075 T651 aluminium alloy. A thin-walled pocket structure was designed and manufactured. The aspects related to geometric accuracy, surface quality and cutting time were analysed. On the basis of the obtained results, it was found that in case of geometric accu-racy related to the wall deformation, the greatest deformation was obtained after HPC, while the smallest one after HSC. The difference was over 400% (comparing HPC to HSC). A similar relation-ship was also received for the quality of the machined surface. Analysing the cutting time, the best result was achieved after HPC in reference to HSC and conventional machining. Taking into ac-count all analysed variables, the best solution was a combination of HPC and HSC. Thanks to the use of high-speed machining as a finishing, it is possible to receive high geometric accuracy and quality of the machined surface, while the application of HPC for roughing allows to shorten the cutting time, translating into an increase in the efficiency of the milling process. Conventional ma-chining is slightly less advantageous in terms of geometric accuracy and surface quality and it could possibly be used alternatively with High Speed Cutting, but its weakness is significantly lower effi-ciency compared to high-performance machining.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 3; 98--110
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On rank one elements
Autorzy:
Harte, Robin
Powiązania:
https://bibliotekanauki.pl/articles/1288542.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
Without the "scarcity lemma", two kinds of "rank one elements" are identified in semisimple Banach algebras.
Źródło:
Studia Mathematica; 1995-1996, 117, 1; 73-77
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On orbits of elements
Autorzy:
Rolewicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/1386543.pdf
Data publikacji:
1969
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Studia Mathematica; 1969, 32, 1; 17-22
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mikroprzetworniki termopneumatyczne w elementach płynowych
Thermopneumatic microactuators in fluid elements
Autorzy:
Dindorf, R.
Powiązania:
https://bibliotekanauki.pl/articles/152418.pdf
Data publikacji:
2002
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mikroprzetworniki termopneumatyczne
elementy płynowe
thermopneumatic microactuators
fluid elements
Opis:
Artykuł dotyczy zastosowania mikroprzetworników termopneumatycznych w elementach płynowych (hydraulicznych i pneumatycznych). Przetworniki termopneumatyczne są uruchamiane ciśnieniem gazu (powietrza) podgrzanego elektrycznie. Przedstawiono przykłady mikropompy membranowej i bistabilnego mikrozaworu foliowego uruchamianych termopneumatycznie. Mikroprzetworniki są zaprojektowane do zastosowań w mikrorobotach i mikrotechnice.
The paper deals with the use of thermopneumatics microactuators in fluid (hydraulics and pneumatics) elements. The thermopneumatic microactuators are driven by gas (air) pressure heated electrically. The examples of thermopneumatically actuated membrane micropump and bistable foil microvavle are presented. Microactuators are designed for use in microrobots and microtechniques.
Źródło:
Pomiary Automatyka Kontrola; 2002, R. 48, nr 3, 3; 9-10
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pre-assembly of FEM n-th order triangular elements
Autorzy:
Sowa, M.
Typańska, D.
Powiązania:
https://bibliotekanauki.pl/articles/377713.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
assembly
finite element method
higher order elements
Opis:
The paper presents a method of preparing data, which can be used to simplify the procedure of formulating local stiffness matrices in the finite element method (the part of preparing this data is hence referred to as the pre-assembly). For the presentation of the methodology non-curvilinear triangular elements have been chosen, where it has been taken into account that any order can be selected for the elements. The paper presents a mathematical basis of how the auxiliary data is prepared. The appropriate relations to the final FEM equations are also given.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 77; 133-139
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The order of normalform hypersubstitutions of type (2)
Autorzy:
Denecke, Klaus
Mahdavi, Kazem
Powiązania:
https://bibliotekanauki.pl/articles/728816.pdf
Data publikacji:
2000
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
hypersubstitutions
terms
idempotent elements
elements of infinite order
Opis:
In [2] it was proved that all hypersubstitutions of type τ = (2) which are not idempotent and are different from the hypersubstitution whichmaps the binary operation symbol f to the binary term f(y,x) haveinfinite order. In this paper we consider the order of hypersubstitutionswithin given varieties of semigroups. For the theory of hypersubstitution see [3].
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2000, 20, 2; 183-192
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical model of plastic destruction of thick steel structural elements
Autorzy:
Kowalski, J.
Kozak, J.
Powiązania:
https://bibliotekanauki.pl/articles/259652.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
impact strength
numerical modeling
steel structural elements
Opis:
In the shipbuilding industry, the risk of brittle fracture of the structure is limited by using certified materials with specified impact strength, determined by the Charpy method (for a given design temperature) and by supervising the welding processes (technology qualification, production supervision, non-destructive testing). For off-shore constructions, classical shipbuilding requirements may not be sufficient. Therefore, the regulations used in the construction of offshore structures require CTOD tests for steel and welded joints with a thickness greater than 40 mm in the case of high strength steel and more than 50 mm in the case of other steels. Classification societies do not accept CTOD test results of samples with a thickness less than the material tested. For this reason, the problem of theoretical modeling of steel structure destruction process is a key issue, because laboratory tests for elements with high thickness (in the order of 100 mm and more) with a notch are expensive (large samples, difficulties in notching), and often create implementation difficulties due to required high load and range of recorded parameters. The publication will show results and conclusions from numerical modeling of elastic properties for steel typical for offshore applications. Calculations were carried out at the Academic Computer Centre in Gdańsk.
Źródło:
Polish Maritime Research; 2018, 2; 78-84
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photochemical investigation of elements in Oryza sativa
Autorzy:
McKenzie, Feanna
Verma, Vishwa N.
Powiązania:
https://bibliotekanauki.pl/articles/1192076.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Oryza Sativa
Rice Grains
Human Consumption
Trace Elements
AAS
Opis:
Short white rice grains produced locally from Mahaica, Guyana were collected from the rice farm and analyzed for ten trace elements by flame atomic absorption spectrometer. The concentrations of the trace elements investigated are as follows: - Ca (76.81), Mg (54.30), Fe (28.2), Cu (4.90), Zn (71.16) and Mn (14.33) mg/Kg. There had been controversial reports about the toxic elements normally present in the rice produced in different areas and conditions. The other four toxic elements As, Co, Pb and Al were also analyzed but not detected. With reference to the literature on the maximum daily intakes for human consumption, the concentration levels were all below the literature except for zinc and manganese
Źródło:
World Scientific News; 2016, 37; 50-60
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a snap connector to connect panel elements
Autorzy:
Matwiej, Łukasz
Kłos, Robert
Bonowski, Mirosław
Powiązania:
https://bibliotekanauki.pl/articles/24072158.pdf
Data publikacji:
2019
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
connecting elements
snap connector
numerical calculations
Opis:
Design of a snap connector to connect panel elements. The aim of this study was to design, manufacture and verify the tensile strength of a prototype snap connector to be used to connect panel elements. Firstly, analyses were conducted on solutions of commercially available designs for connectors invisible from the cabinet’s outside and those with minimized visibility. While searching for the best concept of connector design, three proposals were prepared, of which – after thorough analysis of design – one concept was selected. In the next step, the adopted solution was improved so that the connector met the previously formulated design requirements. In the course of further analyses, the causes and effects of failure were verified in order to limit or eliminate potential defects. In the next stage of the study, numerical calculations were conducted for the nut and the connector, concerning tensile strength, using the Autodesk Simulation Multiphysics program. After a prototype connector was manufactured, tensile strength tests were conducted on the connector using a strength testing machine. Experiments verified the correctness of the developed design in terms of geometry and the physico-mechanical properties of materials of individual elements, and resulted in possible changes proposed in the design of the final connector product.
Projekt złącza zatrzaskowego do łączenia elementów płytowych. Celem niniejszej pracy było zaprojektowanie, wykonanie i sprawdzenie wytrzymałości na rozciąganie prototypu złącza zatrzaskowego przeznaczonego do łączenia elementów płytowych.Na wstępie dokonano wnikliwej analizy rozwiązań konstrukcji podobnych złączy znajdujących się na rynku. Dokonano także przeglądu wymagań dotyczących nowoprojektowanej konstrukcji złącza. W ramach poszukiwań najlepszej koncepcji rozwiązania konstrukcji złącza przygotowano trzy propozycje, z których – po przeprowadzeniu wnikliwej analizy konstrukcji – wybrano jedną koncepcję. W kolejnym etapie dokonano udoskonalenia przyjętego rozwiązania tak, aby złącze to spełniało postawione wcześniej wymagania projektowe. Podczas dalszych badańprzeprowadzono analizę rodzajów i skutków możliwych błędów (analiza FMEA), co miało posłużyć ograniczeniu lub wyeliminowaniu możliwych wad. W dalszej części pracy przeprowadzono obliczenia numeryczne przy wykorzystaniu programu AutodeskSimulationMultiphysics. Po wykonaniu prototypu złącza przeprowadzono badania wytrzymałości złącza na rozciąganie przy wykorzystaniu maszyny wytrzymałościowej. Badania eksperymentalne pozwoliły na zweryfikowanie poprawności opracowanej konstrukcji pod kątem geometrii oraz właściwości fizyko-mechanicznych materiału poszczególnych elementów i zaproponowanie ewentualnych zmian w konstrukcji finalnego złącza.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2019, 108; 26--38
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 3485

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