Skocz do pozycji: 1.

Tytuł:

Numerical analysis of temperature influence on deformation and effort of bimetallic element

Autorzy:

Panowicz, R.
Kucewicz, M.

Powiązania:

https://bibliotekanauki.pl/articles/241699.pdf

Data publikacji:

2016

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

finite elements method
bimetallic elements
thermoelasticity

Opis:

Bimetallic elements consist of at least two, connected together, material layers. The materials have different coefficients of thermal expansion. An active layer of bimetallic elements has a greater thermal expansion coefficient, whereas a passive layer has a lower one. Therefore, deformation of bimetallic elements occurs due to a change in temperature. The simplest case of bimetallic elements is a strip, which bends in the shape of an arc. As a consequence of elements deformation, stresses appear in them. An important problem is optimization of each layer of the element to achieve certain characteristics of the system. The elements should work in an elastic domain in the entire operating range. The aim of the paper is to present both numerical and analytical results for three different bimetallic elements. The following pairs of materials are considered: invar – incoloy, steel – brass and aluminium – molybdenum subjected to uniform heating. An influence of temperature and active layer dimensions of the sample on deformation and stresses of each layer was developed. It was found that the stress value is close to zero, on the boundary of each layer, for characteristic deflections of the considered bimetallic elements. The results of numerical analyses were compared with a theoretical solution presented by Timoshenko. Numerical analyses were performed using the Finite Element Method implemented in the commercial software LS-Dyna.

Źródło:

Journal of KONES; 2016, 23, 3; 389-394
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

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

/5

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Skocz do pozycji: 3.

Tytuł:

Tectonic discrimination of siliciclastic sedimentary record of the northern Tethyan margin at the end of the Triassic

Autorzy:

Vďačný, Marek
Michalík, Josef
Lintnerová, Otília

Powiązania:

https://bibliotekanauki.pl/articles/2058608.pdf

Data publikacji:

2019

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

sedimentology
geodynamics
major elements
trace elements
palaeogeography

Opis:

Tectonic setting of both the uppermost Triassic Tomanová and the lowermost Jurassic Dudziniec formations can be characterized by a series of diagnostic discrimination diagrams. High-silica and low-silica multi-dimensional diagrams indicate that the sediments could have been deposited in the continental collision/rift setting. Diagrams of K2O/Na2O versus SiO2, SiO2/Al2O3 versus K2O/Na2O and Th-Co-Zr/10 as well as Th-Sc-Zr/10 determine an origin from the tectonically active and/or passive continental margin setting. REE parameters indicate predominantly a passive margin tectonic setting of the sediments. The most probable source of clastic admixture in the Scythian to Domerian sediments in the Tatric Unit was situated in a remnant of the Variscan collisional orogen - the Vindelician Highlands. Occasional monsoonal rains occurring in orbitally controlled cycles transported weathered material from the source area down river valleys on the seaward slopes of the Variscan Vindelician Mountains towards the Tethyan Sea. The input of this material influenced also the marginal parts of the Fatricum (e.g., Vysoká or Havran units).

Źródło:

Geological Quarterly; 2019, 63, 1; 30--38
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

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

/5

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Skocz do pozycji: 5.

Tytuł:

The monoid of generalized hypersubstitutions of type τ = (n)

Autorzy:

Puninagool, Wattapong
Leeratanavalee, Sorasak

Powiązania:

https://bibliotekanauki.pl/articles/729031.pdf

Data publikacji:

2010

Wydawca:

Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii

Tematy:

monoid
regular elements
idempotent elements
Green's relations
generalized hypersubstitution

Opis:

A (usual) hypersubstitution of type τ is a function which takes each operation symbol of the type to a term of the type, of the same arity. The set of all hypersubstitutions of a fixed type τ forms a monoid under composition, and semigroup properties of this monoid have been studied by a number of authors. In particular, idempotent and regular elements, and the Green's relations, have been studied for type (n) by S.L. Wismath.
A generalized hypersubstitution of type τ=(n) is a mapping σ which takes the n-ary operation symbol f to a term σ(f) which does not necessarily preserve the arity. Any such σ can be inductively extended to a map σ̂ on the set of all terms of type τ=(n), and any two such extensions can be composed in a natural way. Thus, the set $Hyp_{G}(n)$ of all generalized hypersubstitutions of type τ=(n) forms a monoid. In this paper we study the semigroup properties of $Hyp_{G}(n)$. In particular, we characterize the idempotent and regular generalized hypersubstitutions, and describe some classes under Green's relations of this monoid.

Źródło:

Discussiones Mathematicae - General Algebra and Applications; 2010, 30, 2; 173-191
1509-9415

Pojawia się w:

Discussiones Mathematicae - General Algebra and Applications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

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

/5

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Skocz do pozycji: 7.

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

/5

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Skocz do pozycji: 8.

Tytuł:

The influence of nitrogen fertilization with ENTEC-26 and ammonium nitrate on the concentration of thirty-one elements in carrot (daucus carota l.) storage roots
Wpływ nawożenia azotem z ENTEC-26 i saletrą amonową na zawartość trzydziestu jeden pierwiastków w korzeniach spichrzowych marchwi (Daucus carota L.)

Autorzy:

Smolen, S.
Sady, W.
Wierzbinska, J.

Powiązania:

https://bibliotekanauki.pl/articles/1188055.pdf

Data publikacji:

2012

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza

Tematy:

nitrogen fertilization
nitrification inhibitor
DMPP
heavy metals
rare elements
trace elements

Opis:

Aplikowanie inhibitorów nitryfikacji wraz z nawozami azotowymi (zawierającymi zredukowane formy azotu: amonową i amidową) może wzmacniać zakwaszające działanie tych nawozów na glebę. W efekcie może to prowadzić do obniżenia pH oraz zmian zawartości dostępnych dla roślin form metali ciężkich i pierwiastków śladowych w glebie. Celem badań była ocena wpływu stosowania nawozów azotowych z ENTEC-26 (zawierającego inhibitor nitryfikacji 3,4-dimetylopyrazolofosfat /DMPP/) i saletrą amonową na skład mineralny korzeni spichrzowych marchwi. Przeprowadzono dwuletnie badania z polową uprawą marchwi Kazan Fj. Doświadczenie założono metodą split-plot w czterech powtórzeniach. Obiektami badań były kombinacje ze zróżnicowanym nawożeniem azotem: 1 - kontrola (bez nawożenia azotem), 2 - ENTEC-26 35+35, 3 - ENTEC-26 70+70, 4 - ENTEC-26 105+105, 5 - saletra amonowa 35+35, 6 - saletra amonowa 70+70, 7 - saletra amonowa 105+105, gdzie: 35+35, 70+70 i 105+105 oznacza dawkę azotu w kg N ha- 1 stosowaną w nawożeniu przedsiewnym i w nawożeniu pogłównym. w korzeniach spichrzowych oraz w glebie po uprawie marchwi zawartość: Ag, Al, B, Ba, Ca, Ce, Co, Cr, Dy, Fe, Ga, In, K, La, Li, Lu, Mg, Mn, Na, Ni, P, Pb, S, Sc, Sn, Sr, Ti, Tm, Y, Yb i V była oznaczana techniką ICP-OES. Nawożenie azotem miało istotny wpiyw na zawartość Co, Fe, In, Li, Mn, Ni, S, Sc, Sr, Y, Yb i V w marchwi. Jednakże wpiyw ten był zróżnicowany w zależności od zastosowanego sposobu nawożenia azotem w badanych kombinacjach. Nie stwierdzono natomiast istotnego oddziaływania nawożenia azotem na zawartość Ag, Al, B, Ba, Ca, Ce, Cr, Dy, Ga, K, La, Lu, Mg, Na, P, Pb, Ti i Sn w marchwi. W porównaniu z kontrolą, zastosowane nawożenie azotem we wszystkich dawkach zarówno w formie ENTEC-26, jak i saletry amonowej powodowało zmniejszenie zawartości Mg, Al, B, Ba, Ce, Fe, Ga, La, Ni, Pb, Ti, Y, V, Cr, Dy, In, Li, Lu, Sc i Yb oraz zwiększenie zawartości Ca, Sr i Ag w glebie po uprawie marchwi. Jednakże wykazane zmiany zawartości tych pierwiastków w glebie pod wpływem nawożenia azotem nie miały odzwierciedlenia w ich zawartości w korzeniach spichrzowych marchwi.

Źródło:

Journal of Elementology; 2012, 17, 1; 115-137
1644-2296

Pojawia się w:

Journal of Elementology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Educational Elements and Motivation

Autorzy:

László, Karol

Powiązania:

https://bibliotekanauki.pl/articles/28409134.pdf

Data publikacji:

2005-03-31

Wydawca:

Wydawnictwo Adam Marszałek

Tematy:

elements of education
motivation

Opis:

Motivation is an important condition to win, hold and develop pupil’s activity in the teaching process. That is why we consider it useful to inform students of teaching professions about the possibilities how to utilize particular elements of education for motivation of their future pupils.

Źródło:

The New Educational Review; 2005, 5; 195-213
1732-6729

Pojawia się w:

The New Educational Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Application of the boundary element method in radiation
Zastosowanie metody elementów brzegowych do rozwiązywania zagadnień promieniowania ciepła

Autorzy:

Białecki, R.A.
Grela, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/281238.pdf

Data publikacji:

1998

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

heat radiation
boundary elements

Opis:

Two applications of the bonduary element technique to radiative analysis are discussed: radiation in participating media and the presence of concave, self irradiating cavities in heat conducting bodies. When compared with classic Hottel's zoning approach, BEM leads to shorter computing times. This is achieved because the most time consuming procedure of Hottel's approach, volume integration, can be avoided. Additionally, instead of multiple integrals only a single integration ought to be performed. The paper presents a general, self adaptive quadrature capable of evaluating integrals over the elements located close to the observation point. The paper shows also an original technique of coupling heat radiation and conduction. Both problems are solved by using BEM. Static condensation of linear unknowns before entering the iterative loop, makes this approach very efficient. Numerical examples are included.
Rozpatrzono dwa zastosowania metody elementów brzegowych (MEB) w zagadnieniach promieniowania ciepła: transmisja promieniowania w ośrodku optycznie czynnym i przewodzenia ciepła w ciałach zawierających promieniujące wnęki. Czas obliczeń przy zastosowaniu MEB jest krótszy niż w klasycznej metodzie strefowej Hottela. W MEB unika się całkowania po obiętości, czyli najbardziej czasochłonnego etapu metody Hottela. Dodatkowo, w miejsce całek wielokrotnych obliczanych w metodzie strefowej, w MEB oblicza się całki jednokrotne, W artykule zaprezentowano ogólną, adaptacyjną klawiaturę do obliczeń całek po elementach leżących blisko punktu obserwacji. Przedstawiono także oryginalną procedurę sprzęgania zadań promieniowania we wnękach i przewodzenia w ściankach tworzących tę wnękę. Oba problemy cząstkowe rozwiązywane są metodą elementów brzegowych. Przed rozpoczęciem procesu iteracyjnego rozwiązywania równań bilansu ciepła, eliminowane są liniowe niewiadome. Wykorzystuje przy tym technikę statystycznej kondensacji. Procedura taka prowadzi do znacznego skrócenia czasu obliczeń. Artykuł zawiera przykłady numeryczne.

Źródło:

Journal of Theoretical and Applied Mechanics; 1998, 2; 351-364
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Problems of numerical bifurcation reproducing in post-critical deformation states of aircraft structures

Autorzy:

Kopecki, T.
Mazurek, P.

Powiązania:

https://bibliotekanauki.pl/articles/281324.pdf

Data publikacji:

2013

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

bifurcation
experiment
finite elements

Opis:

The study presents results of research on the problem of obtaining credible results of nonlinear FEM analyses of thin-walled load-bearing structures subjected to post-critical loads. The similarity of numerical simulation results and actual stress distribution states depends on the correct numerical reproduction of bifurcations that occur during an advanced deformation process.

Źródło:

Journal of Theoretical and Applied Mechanics; 2013, 51, 4; 969-977
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

FEM Analysis of Active Reduction of Torsional Vibrations of Clamped-Free Beam by Piezoelectric Elements for Separated Modes

Autorzy:

Augustyn, E.
Kozień, M. S.
Prącik, M.

Powiązania:

https://bibliotekanauki.pl/articles/176836.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

piezoelectric elements
torsional vibrations

Opis:

Beams with rectangular cross-section, with large length-to-width ratio, can be excited to torsional vibrations. If the piezoelectric elements are mounted to the beam in pairs at the same cross-section with two separated elements positioned on the same side of the beam, and the voltages applied to them are in the opposite phase, they produce twisting moments which can be applied to reduce the torsional vibrations. Results of FEM simulations are presented and analysed in the paper. All analyses are performed for a steel free-clamped beam. The piezoelectric elements made of PZT material are mounted in pairs on one side of the beam. The analyses are done for separated natural modes.

Źródło:

Archives of Acoustics; 2014, 39, 4; 639-644
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

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

/5

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Skocz do pozycji: 14.

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

/5

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Skocz do pozycji: 15.

Tytuł:

Size levels for arcs

Autorzy:

Nadler, Sam
West, T.

Powiązania:

https://bibliotekanauki.pl/articles/1214951.pdf

Data publikacji:

1992

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Tematy:

hyperspace
cyclic elements
absolute retract

Opis:

We determine the size levels for any function on the hyperspace of an arc as follows. Assume Z is a continuum and consider the following three conditions: 1) Z is a planar AR; 2) cut points of Z have component number two; 3) any true cyclic element of Z contains at most two cut points of Z. Then any size level for an arc satisfies 1)-3) and conversely, if Z satisfies 1)-3), then Z is a diameter level for some arc.

Źródło:

Fundamenta Mathematicae; 1992, 141, 3; 243-255
0016-2736

Pojawia się w:

Fundamenta Mathematicae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Metal contents in soils of Kaffiöyra, Spitsbergen

Autorzy:

Plichta, Witold
Kuczyńska, Irena

Powiązania:

https://bibliotekanauki.pl/articles/2052828.pdf

Data publikacji:

1991

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Arctic
Spitsbergen
soil
metal elements

Źródło:

Polish Polar Research; 1991, 12, 2; 183-193
0138-0338
2081-8262

Pojawia się w:

Polish Polar Research

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 17.

Tytuł:

An attempt to determine the digestibility of natural food in Antarctic seals using tracer method. A preliminary study

Autorzy:

Weiner, January
Woyciechowski, Michał
Zieliński, Jan

Powiązania:

https://bibliotekanauki.pl/articles/2058103.pdf

Data publikacji:

1981

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Antarctic seals
digestibility
mineral elements

Źródło:

Polish Polar Research; 1981, 2, 1-2; 153-163
0138-0338
2081-8262

Pojawia się w:

Polish Polar Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Analysis and monitoring of electrical grounding grid encapsulated with concrete: case study using simulation in finite element method

Autorzy:

Pereira, T. M.
Lima, R.
Gomes, V. M.
Calixto, W. P.
Alves, A. J.

Powiązania:

https://bibliotekanauki.pl/articles/136184.pdf

Data publikacji:

2017

Wydawca:

EEEIC International Barbara Leonowicz Szabłowska

Tematy:

grounding systems
finite elements method

Opis:

This work study the influence of concrete, plaster, clay and others buried structures in grounding systems. Comparison of soil characteristics between dry and rainy seasons on different grounding systems. The study includes comparison of six different grounding system on dry season and wet season. Simulations in finite element method was performed for tree layer stratified soil and the electrostatic equipotential surfaces were mapped into the region of interest.

Źródło:

Transactions on Environment and Electrical Engineering; 2017, 2, 2; 31-36
2450-5730

Pojawia się w:

Transactions on Environment and Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Content of Selected Elements in the Leaves Growing in an Urban Agglomeration
Zawartość wybranych pierwiastków w liściach drzew rosnących w aglomeracji miejskiej

Autorzy:

Malinowska, K.

Powiązania:

https://bibliotekanauki.pl/articles/389409.pdf

Data publikacji:

2010

Wydawca:

Towarzystwo Chemii i Inżynierii Ekologicznej

Tematy:

pierwiastki
Acer platanoides L.
elements

Opis:

In the study the content of K, Ca, Mg and Na in the leaves of Acer platanoides L., growing in the agglomeration of Gdynia and Gdansk, was shown and the mean ion equivalent ratios between these elements were determined. The obtained results showed large differentiation in the amount of the elements in the leaves of maple growing on particular sites in the urban environment. Correlation relationships between the concentration of heavy metals in the leaves of maple show a significant influence, particularly in the case of of Cd and Pb, on the content of determined elements in the assimilation apparatus. The results of the studies on the trees also showed changes in mutual ion ratios of the elements in the leaves.
W pracy przedstawiono zawartość K, Ca, Mg i Na w liściach Acer platanoides L., rosnącego w aglomeracji miejskiej Gdyni i Gdańska oraz określono średnie równoważnikowe proporcje jonowe między tymi pierwiastkami. Uzyskane wyniki wykazały duże zróżnicowanie w zawartości oznaczanych pierwiastków w liściach klonu rosnącego na poszczególnych stanowiskach w środowisku miejskim. Zależności korelacyjne między koncentracją metali ciężkich w liściach klonu wskazują na znaczący wpływ szczególnie Cd i Pb na zawartość oznaczanych pierwiastków w aparacie asymilacyjnym. U badanych drzew uzyskane wyniki wykazały również zmiany we wzajemnych proporcjach jonowych pierwiastków w liściach.

Źródło:

Ecological Chemistry and Engineering. A; 2010, 17, 10; 1263-1268
1898-6188
2084-4530

Pojawia się w:

Ecological Chemistry and Engineering. A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Mixture and Transformation in Aristotle’s De generatione et corruptione

Autorzy:

Zarifian, Arman

Powiązania:

https://bibliotekanauki.pl/articles/633444.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

Aristotle
physics
generation
mixture
elements

Opis:

In his works on natural sciences, primarily in the Physics, Aristotle focuses on different forms of metabolē and distinguishes movement in general from substantial change. The On generation and corruption deals with the latter. When reading this treatise, one should pay particular attention to the concept of mixture. Apart from being the subject of a specific chapter (I 10), the problem of mixture permeates the whole work. But what exactly is mixture? Is it a simple combination of small parts? Can a compound of water and wine be called mixture? If so, is this mixture and nothing more? In the course of the discussion, it is argued that the Aristotelian idea of mixis does not correspond to the concept that is usually associated with it. Rather, it is shown that mixis is fundamental for comprehending the physical world and constitutes not only the term per quem the first elements of all material bodies originate, but also plays a fundamental role in all natural sciences, particularly, in biology.

Źródło:

Peitho. Examina Antiqua; 2018, 9, 1; 53-69
2082-7539

Pojawia się w:

Peitho. Examina Antiqua

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Content of Calcium, Magnesium, Sodium and Potassium in the Street Dust from the Area of Białystok (Poland)

Autorzy:

Skorbiłowicz, Mirosław
Skorbiłowicz, Elżbieta

Powiązania:

https://bibliotekanauki.pl/articles/124005.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

major elements
road dust
congestion

Opis:

The aim of the study was to assess the content of Ca, Mg, Na and K in the road dust collected in Białystok from various environments (roads with high traffic intensity, housing estate roads, roads located near parks and green areas), in order to determine the impact of the road transport on the spatial differentiation of the content of the tested components in street dust and identify their main sources. In total, the samples from 69 points were analyzed, which were taken in spring 2018 (late April and May) during the dry weather. The content of Ca, Mg, Na and K was determined by means of atomic absorption spectrometry (AAS). The average contents of the tested elements in the dust from all measuring points were in the following order: Ca (23.53%) > Mg (2.38) > Na (1.16) > K (0.25). This shows that Ca is the most numerous element in the tested dusts. Studies have not shown a significant impact of vehicle traffic, in particular the so-called non-exhaust sources related to this traffic on the content of main elements in the Białystok road dusts. The analyses have indicated that the main source of Ca and Mg in the Białystok road dust constitute the structural elements of roads, bridges and structures, in which building cement and its derivatives are the main component.

Źródło:

Journal of Ecological Engineering; 2019, 20, 10; 125-131
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Pochodzenie materii meteorytowej
The origin of meteorite constituents

Autorzy:

Kozłowski, Szymon

Powiązania:

https://bibliotekanauki.pl/articles/2195009.pdf

Data publikacji:

2023

Wydawca:

Polskie Towarzystwo Meteorytowe

Tematy:

elements
minerals
dust
meteorites
cosmology

Opis:

In this article, I briefly review the history of the elements in the Universe, starting from cosmic inflation and ending at the creation of elements and minerals that we find in meteorites.

Źródło:

Acta Societatis Metheoriticae Polonorum; 2023, 14; 100-113
2080-5497

Pojawia się w:

Acta Societatis Metheoriticae Polonorum

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Indium in polymetallic mineralisation at the Gierczyn mine, Karkonosze-Izera Massif, Poland : results of EPMA and LA-ICP-MS investigations

Autorzy:

Foltyn, Krzysztof
Bertrandsson Erlandsson, Viktor
Kozub-Budzyń, Gabriela Anna
Melcher, Frank
Piestrzyński, Adam

Powiązania:

https://bibliotekanauki.pl/articles/2058542.pdf

Data publikacji:

2020

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

Gierczyn
indium
trace elements
metamorphism

Opis:

Cassiterite and base-metal mineralisation from the Gierczyn mine on the Karkonosze-Izera Massif, Poland has been studied using electron microprobe and LA-ICP-MS (Laser Ablation Inductively Coupled Plasma Mass Spectrometry) techniques in order to determine the content of indium in the ore minerals. The main carriers of this element are sphalerite (up to 433 μ/g of In), chalcopyrite (up to 117 μ/g of In) and cassiterite (up to 0.02 wt.% In). Trace element contents of sulphides, especially Ga in chalcopyrite intergrown with sphalerite in comparison with chalcopyrite without sphalerite, may indicate metamorphic re-equlibration and suggests that the ore minerals might recrystallized and underwent metamorphism in conditions of greenschist/amphibolite facies. Although the deposits in the Stara Kamienica Schist Belt are not of economic value, they can contribute to better understanding of the relations between trace element partitioning and the formation of ore minerals.

Źródło:

Geological Quarterly; 2020, 64, 1; 74--85
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

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

/5

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Skocz do pozycji: 25.

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

/5

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Skocz do pozycji: 26.

Tytuł:

Chemical and morphological characterization of polymetallic (Mn-Fe) nodules from the Clarion-Clipperton Zone in the Pacific Ocean

Autorzy:

Kozłowska-Roman, Agata
Mikulski, Stanisław

Powiązania:

https://bibliotekanauki.pl/articles/2058694.pdf

Data publikacji:

2021

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

polymetallic nodules
critical elements
rare earth elements
deep-sea mining
Clarion-Clipperton Fracture Zone
Pacific

Opis:

Geochemical studies (WD-XRF, ICP-MS, and GF-AAS) have shown that polymetallic nodules from the eastern Clarion-Clipperton Zone (CCZ) in the Pacific Ocean are enriched in several metals such as Cu (mean 1.16%), Ni (1.15%), Co (0.15%), and Zn (0.14%), as well as remarkable contents of Mo (0.059%), V (0.04%), Ce (0.019%), Nd (0.011%), Li (0.015), and Pt (43 ppb). The average content of REE, together with Y and Sc, is 620 ppm. In nodules from the CCZ metal concentrations are often much higher than those reported in nodules from other ocean basins in the world. The bulk-nodule mean value of the Mn/Fe ratio is 5.3, which is characteristic for a mixed (hydrogenetic and diagenetic) origin of the nodules. Microprobe investigation revealed two different chemical compositions of the layers, and ascertained their general metal content. The nodules analyzed are composed mainly of concentric-collomorphic laminae of Mn and Fe (oxy)hydroxides which crystallized around mineral nuclei (e.g., quartz, clay minerals), bioclasts or rock fragments. They are from 3.3 to 7.6 cm in diameter. The chemical and physical properties of the laminae allowed distinction of two genetic types: hydrogenetic and diagenetic. Those formed as a result of hydrogenesis had increased values of Co, Si, Cl and S, while formed diagenetically showed increased levels of Cu, Ni, Mg, Zn and K. These lamina types are characterized by different growth structures, reflectivity, density and Mn/Fe ratios. The ratio of the diagenetic layers to hydrogenetic layers (192/53) in representative polymetallic nodules shows that the nodules of this study are of mixed hydrogenetic-diagenetic type. A mixed genesis was also shown by discriminant diagrams, with these CCZ samples being located at the transition between typical hydrogenetic and diagenetic fields.

Źródło:

Geological Quarterly; 2021, 65, 4; 177--194
1641-7291

Pojawia się w:

Geological Quarterly

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Trace analysis of Indonesian volcanic ash using thermal and epithermal neutron activation analysis

Autorzy:

Canion, B.
Jacques, C.
Landsberger, S.
Taftazani, A.

Powiązania:

https://bibliotekanauki.pl/articles/146890.pdf

Data publikacji:

2012

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

neutron activation analysis (NAA)
trace elements
volcanic ash
rare earth elements (REE)
Mount Merapi

Opis:

There is continued great interest in determining the trace element and heavy metal content of volcanic ash for a variety of reasons. The motivation stems from the desire to understand the geochemistry of volcanic ash in imbedded geological formations, the impact on seawater, and the possible release of toxic elements into the environment that may impact livestock grazing and water systems. Ash from volcanic plumes can go as high 8-18 km thus affecting climate and air traffic. We have employed Compton suppression neutron activation analysis (NAA) with thermal and epithermal neutrons to determine trace elements in volcanic ash from Indonesian eruption of Mount Merapi in October 2010. We found a wide range of elements, including several rare earth elements.

Źródło:

Nukleonika; 2012, 57, 4; 585-589
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Characteristics of the Ahmadabad hematite/barite deposit, Iran – studies of mineralogy, geochemistry and fluid inclusions

Autorzy:

Babaei, A. H.
Ganji, A.

Powiązania:

https://bibliotekanauki.pl/articles/94546.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

geochemistry
trace elements
rare earth elements
Semnan
geochemia
pierwiastki śladowe
pierwiastki ziem rzadkich
REE

Opis:

The Ahmadabad hematite/barite deposit is located to the northeast of the city of Semnan, Iran. Geostructurally, this deposit lies between the Alborz and the Central Iran zones in the Semnan Subzone. Hematite-barite mineralisation occurs in the form of a vein along a local fault within Eocene volcanic host rocks. The Ahmadabad deposit has a simple mineralogy, of which hematite and barite are the main constituents, followed by pyrite and Fe-oxyhydroxides such as limonite and goethite. Based on textural relationships between the above-mentioned principal minerals, it could be deduced that there are three hydrothermal mineralisation stages in which pyrite, hematite and barite with primary open space filling textures formed under different hydrothermal conditions. Subsequently, in the supergene stage, goethite and limonite minerals with secondary replacement textures formed under oxidation surficial conditions. Microthermometric studies on barite samples show that homogenisation temperatures (TH) for primary fluid inclusions range from 142 to 256°C with a temperature peak between 200 and 220°C. Salinities vary from 3.62 to 16.70 NaCl wt% with two different peaks, including one of 6 to 8 NaCl wt% and another of 12 to 14 NaCl wt%. This indicates that two different hydrothermal waters, including basinal and sea waters, could have been involved in barite mineralisation. The geochemistry of the major and trace elements in the samples studied indicate a hydrothermal origin for hematite and barite mineralisation. Moreover, the Fe/Mn ratio (>10) and plots of hematite samples of Ahmadabad ores on Al-Fe-Mn, Fe-Mn-(Ni+Co+ Cu)×10, Fe-Mn-SiX2 and MnO/TiO2 – Fe2O3/TiO2 diagrams indicate that hematite mineralisation in the Ahmadabad deposit occurred under hydrothermal conditions. Furthermore, Ba and Sr enrichment, along with Pb, Zn, Hg, Cu and Sb depletion, in the barite samples of Ahmadabad ores are indicative of a low temperature hydrothermal origin for the deposit. A comparison of the ratios of LaN/YbN, CeN/YbN, TbN/LaN, SmN/NdN and parameters of Ce/Ce* and La/La* anomalies of the hematite, barite, host volcanic rocks and quartz latite samples to each other elucidate two important points: 1) the barite could have originated from volcanic host rocks, 2) the hematite could have originated from a quartz latite lithological unit. The chondrite normalised REE patterns of samples of hematite barite, volcanic host rocks and quartz latite imply that two different hydrothermal fluids could be proposed for hematite and barite mineralisation. The comparison between chondrite normalised REE patterns of Ahmadabad barite with oceanic origin barite and low temperature hydrothermal barite shows close similarities to the low temperature hydrothermal barite deposits.

Źródło:

Geologos; 2018, 24, 1; 55-68
1426-8981
2080-6574

Pojawia się w:

Geologos

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

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

/5

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Skocz do pozycji: 30.

Tytuł:

Trace element geochemistry of coals from the Southern Cantabrian Zone (NW Spain): preliminary results

Autorzy:

Botor, Dariusz

Powiązania:

https://bibliotekanauki.pl/articles/2086486.pdf

Data publikacji:

2011

Wydawca:

Polskie Towarzystwo Mineralogiczne

Tematy:

trace elements
coal
Cantabrian Mountains
Spain

Opis:

Bituminous to anthracite coals from three small Stephanian intramontane coal-bearing basins (La Magdalena, Cinera-Matallana and Sabero) located along the Sabero-Gordón fault line strike-slip systems of the Southern Cantabrian Zone (SCZ) were examined. Coal rank expressed as mean vitrinite reflectance values of these Stephanian coals is in the range 0.72-3.96%. The vitrinite maceral group exceeds 72 vol. % in all of the coals. The coals are characterized by relatively variable contents of mineral matter and coal-ash. The mineral matter comprises, in the main, clay minerals, carbonates, sulphides and quartz. The coals exhibit medium-high concentrations (see for comparison Ronov et al. 1990; Kabata-Pendias, Pendias 1999; Ketris, Yudovich 2009) of the following elements (in ppm): ΣREE (53-205), Ba (300-900), As (11-57), Zn (<50-150), Cr (10-160), Rb (50- 145), Co (5-26), Sc (2-24.6), Ce (17-99), Yb (1.3-4.5), Th (2.4-11.9) and U (1.1-8.1), Br (<1-14), Cs (<2-9), Eu (<0,3-1.5), Lu (0.11-0.85) and Sb (0.8-4.8), and relatively low concentrations of Sm (0.6-6.6) and Ta (<1-2). They are also characterised by relatively high Th/U values (1.31-2.29). LREE/HREE values fall in the range 24-44 (average - 30). In contrast, concentrations of Au, Ag, Hg, Ir, Ni, Se, Sn, Sr, and W are below detection limits for the applied INAA method. As the concentrations of elements are significantly higher in coal-ash, most are likely related to mineral matter in the coals.

Źródło:

Mineralogia; 2011, 42, 1; 39--51
1899-8291
1899-8526

Pojawia się w:

Mineralogia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Trace element geochemistry of coals from the Southern Cantabrian Zone (NW Spain): preliminary results

Autorzy:

Botor, D.

Powiązania:

https://bibliotekanauki.pl/articles/2086537.pdf

Data publikacji:

2011

Wydawca:

Polskie Towarzystwo Mineralogiczne

Tematy:

trace elements
coal
Cantabrian Mountains
Spain

Opis:

Bituminous to anthracite coals from three small Stephanian intramontane coal-bearing basins (La Magdalena, Cinera-Matallana and Sabero) located along the Sabero-Gordón fault line strike-slip systems of the Southern Cantabrian Zone (SCZ) were examined. Coal rank expressed as mean vitrinite reflectance values of these Stephanian coals is in the range 0.72-3.96%. The vitrinite maceral group exceeds 72 vol. % in all of the coals. The coals are characterized by relatively variable contents of mineral matter and coal-ash. The mineral matter comprises, in the main, clay minerals, carbonates, sulphides and quartz. The coals exhibit medium-high concentrations (see for comparison Ronov et al. 1990; Kabata-Pendias, Pendias 1999; Ketris, Yudovich 2009) of the following elements (in ppm): ΣREE (53-205), Ba (300-900), As (11-57), Zn (<50-150), Cr (10-160), Rb (50- 145), Co (5-26), Sc (2-24.6), Ce (17-99), Yb (1.3-4.5), Th (2.4-11.9) and U (1.1-8.1), Br (<1-14), Cs (<2-9), Eu (<0,3-1.5), Lu (0.11-0.85) and Sb (0.8-4.8), and relatively low concentrations of Sm (0.6-6.6) and Ta (<1-2). They are also characterised by relatively high Th/U values (1.31-2.29). LREE/HREE values fall in the range 24-44 (average - 30). In contrast, concentrations of Au, Ag, Hg, Ir, Ni, Se, Sn, Sr, and W are below detection limits for the applied INAA method. As the concentrations of elements are significantly higher in coal-ash, most are likely related to mineral matter in the coals.

Źródło:

Mineralogia; 2011, 42, 1; 39--51
1899-8291
1899-8526

Pojawia się w:

Mineralogia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Transposon-associated polymorphisms of stress-responsive gene promoters in selected accessions of Arabidopsis thaliana

Autorzy:

Naydenov, Mladen
Gospodinova, Nadezhda
Apostolova, Elena
Anachkov, Nikolay
Baev, Vesselin
Gozmanova, Mariyana
Minkov, Ivan
Yahubyan, Galina

Powiązania:

https://bibliotekanauki.pl/articles/1038365.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

transposable elements
promoters
natural accessions
Arabidopsis

Opis:

Genetic diversity caused by transposable element movement can play an important role in plant adaptation to local environments. Regarding genes, transposon-induced alleles were mostly related to gene bodies and a few of them to promoter regions. In this study, promoter regions of 9 stress-related genes were searched for transposable element insertions in 12 natural accessions of Arabidopsis thaliana. The promoter screening was performed via PCR amplification with primers designed to flank transposable element insertions in the promoter regions of the reference accession Col-0. Transposable element-associated insertion/deletion (indel) polymorphisms were identified in 7 of the 12 promoter loci across studied accessions that can be developed further as molecular markers. The transposable element absence in the promoter regions of orthologous genes in A. lyrata indicated that the insertion of these transposable elements in A. thaliana lineage had occurred after its divergence from A. lyrata. Sequence analysis of the promoter regions of CML41 (Calmodulin-like protein 41) and CHAP (chaperone protein dnaJ-related) confirmed the indel polymorphic sites in four accessions - Col-0, Wassilewskija, Shahdara, and Pirin. The observed indel polymorphism of the CHAP promoter region was associated with specific gene expression profiles in the different accessions grown at a normal and elevated temperature in a plant growth chamber. The collected data can be a starting point for gene expression profiling studies under conditions resembling the natural habitats of accessions.

Źródło:

Acta Biochimica Polonica; 2018, 65, 3; 391-396
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Profile distribution of metals in Gelic Cambisols of Kaffiöyra, Spitsbergen

Autorzy:

Plichta, Witold
Kuczyńska, Irena
Sapek, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/2052830.pdf

Data publikacji:

1991

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Arctic
Spitsbergen
Gelic Cambisols
metal elements

Źródło:

Polish Polar Research; 1991, 12, 2; 195-201
0138-0338
2081-8262

Pojawia się w:

Polish Polar Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

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

/5

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Skocz do pozycji: 35.

Tytuł:

Nickel and Copper-Free Sintered Structural Steels Containing Mn, Cr, Si, and Mo Developed for High Performance Applications

Autorzy:

Cias, A.
Stoytchev, M.

Powiązania:

https://bibliotekanauki.pl/articles/350824.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

sintered steels
alloying elements
sintering atmosphere

Opis:

In an attempt to study the sinterability of potential high-strength nickel-free sintered structural steels containing Mn, Cr, Si and Mo compacts were prepared based on sponge and water atomised iron powders and on Astaloy prealloyed powders. To these were admixed ferromanganese, ferroslicon, and graphite. The samples were sintered at temperatures 1120 and 1250°C in laboratory tube furnaces in hydrogen, hydrogen-nitrogen atmospheres with dew points better than –60°C or in nitrogen in a semiclosed container in a local microatmosphere. After sintering the samples were slowly cooled or sinterhardened. Generally resultant microstructures were inhomogeneous, consisted of pearlite/ bainite/martensite, but were characterised by an absence of oxide networks. Sintering studies performed over a range of compositions have shown that superior strength, ranging beyond 900 MPa, along with reasonable tensile elongation, can be achieved with these new steels.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 1; 11-17
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

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

/5

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Skocz do pozycji: 37.

Tytuł:

Dwa żywioły bezkresu. Woda i powietrze w filozofii Gastona Bachelarda

Autorzy:

Kotowska, Joanna

Powiązania:

https://bibliotekanauki.pl/articles/667933.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Papieski Jana Pawła II w Krakowie

Tematy:

air
elements
infinity
water
Bachelard G.

Opis:

The article proposes to look at the idea of the infinity from the perspective of a French philosopher, Gaston Bachelard. His theory concerning the four elements is one of the twentieth century’s most interesting elementary concepts. The aim of this work is to show a manifest link between the notion of the infinity and its realizations (materializations) on the physical plane, that is to say Bachelard’s water and air. Both of these elements represent their own, specific kind of infinity, which is nonetheless very close to a man, because not only conceivable but also present in everyday life. Every single contact with the element is a touch of infinity.

Źródło:

Racjonalia. Z punktu widzenia humanistyki; 2013, 3
2391-6540
2083-9952

Pojawia się w:

Racjonalia. Z punktu widzenia humanistyki

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

The content of macro and microelements in the shoots of Glyceria maxima of the Słupia River

Autorzy:

Parzych, A.
Cymer, M

Powiązania:

https://bibliotekanauki.pl/articles/125150.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

macrophytes
macroelements
trace elements
accumulation
pollution

Opis:

The study shows the content of macro- and microelements in the leaves and rhizomes of Glyceria maxima of the Słupia River in Słupsk. The content of macro and micro-elements in G. maxima was analyzed for each component separately and in an integrated way, and comparing the demand for nutritions. The largest quantity of nitrogen, phosphorus, potassium, magnesium and calcium were found in the leaves, meanwhile zinc, iron, manganese, nickel and copper in the G. maxima rhizomes. The amount of Zn and Cu, in all of the tested positions, within the range of the limit for the plants, and the concentrations of Ni and Mn exceed physiological needs. The U Mann Whitney test showed a number of statistically significant differences in the concentration of the analyzed elements in leaves – rhizomes, leaves – bottom sediment and rhizome bottom sediment relation. The relations between designated heavy metals formed a following series: Mn>Fe>Zn>Ni>Cu in leaves and Fe>Mn>Zn>Ni>Cu in rhizomes. The G. maxima shoots accumulated 985.8 do 1441.4 mmolc∙kg-1 in all the analyzed components, and the lower value of the sum of the accumulated macro and microelements were found in rhizomes. The sum of ion comospition of the macronutrients in the leaves and rhizomes was similar. The content of nitrogen was 51.7–53.7% of this amount, 5.8–8.6% phosphorus, potassium 22.8 – 26.6%, 4.9-5.8% of magnesium, calcium, 8.2–11.9%, and trace elements were 0.58% in total, in the case of leaves and 8.70% in the rhizomes.

Źródło:

Journal of Ecological Engineering; 2014, 15, 4; 29-36
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Changes in the concentrations of selected toxic and essential elements in ewe milk from area with a potentially undisturbed environment

Autorzy:

Pšenková, Martina
Toman, Róbert
Imrich, Ivan
Hluchý, Svätoslav

Powiązania:

https://bibliotekanauki.pl/articles/2086184.pdf

Data publikacji:

2021

Wydawca:

Państwowa Wyższa Szkoła Zawodowa w Tarnowie

Tematy:

essential elements
toxic elements
sheep
milk
environmental burdes
pierwiastki niezbędne
pierwiastki toksyczne
owca
mleko
obciążenia środowiskowe

Opis:

The aim of this study was to evaluate the effect of lactation on the concentration of selected essential and toxic elements in sheep milk forma area of Slovakia with potentially undisturbed environment and to find the actual contamination of selected area, in view of its environmental character. The research was conducted with 400 sheep (Tsigai breed), where the milk samples were taken during the lactation periods (early, middle and late lactation stage). Sheep were reared on the extensive pastures, reared indoors afterwards, fed with pasture ad libidum. Milk samples were collected after morning and afternoon milking. The samples of milk were analysed toxic and essential elements (Ca, Se, Mg, Zn, Fe, Cu, As, Cd, Hg, Ni, Pb) by the method of atomic absorption spectroscopy (AAS). The macro elements concentration in milk changes following the stages of lactation (p < 0.05). There was found that Ca milk concentration increased gradually in the following stages of lactation while Mg, Se, and Fe only in the last stage of lactation. With order hand, the milk concentration of Zn was the highest during summer (p < 0.05). Simultaneously the contents of essential elements (Cu) and toxic elements (As, Cd, Hg, Ni, Pb) in milk were very low, below the limit of quantification. In conclusion, ewe’s milk from potentially undisturbed environmental areas of Slovakia is safe and poses no risk to consumer health, and is suitable for use directly or in dairy processing.

Źródło:

Science, Technology and Innovation; 2021, 13, 2; 28--34
2544-9125

Pojawia się w:

Science, Technology and Innovation

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

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

/5

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Skocz do pozycji: 41.

Tytuł:

Computer Aided Design and Structural Analysis of the Endoprosthesis of the Knee Joint

Autorzy:

Zubrzycki, J.
Karpiński, R.
Górniak, B.

Powiązania:

https://bibliotekanauki.pl/articles/118225.pdf

Data publikacji:

2016

Wydawca:

Polskie Towarzystwo Promocji Wiedzy

Tematy:

knee joint
endoprosthesis
finite elements analysis

Opis:

The paper presents results of the preliminary structural analysis of model of the endoprosthesis of the knee joint. Basics of anatomy and biomechanics of the knee joint were introduced. Based on data from computed tomography, the model of knee joint was constructed. The prototype of the endoprosthesis of the knee joint was designed. After determining physical properties of structural materials, the Finite Elements Analysis of the model was conducted under various load conditions. Finally the results of analysis are presented.

Źródło:

Applied Computer Science; 2016, 12, 2; 84-95
1895-3735

Pojawia się w:

Applied Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Nonlinear elastic brittle damage: numerical solution by means of operator split methods

Autorzy:

Pires-Domingues, S.M.
Costa-Mattos, H.
Rochinha, F.A.

Powiązania:

https://bibliotekanauki.pl/articles/279553.pdf

Data publikacji:

1999

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

damage mechanics
finite elements
splitting technique

Opis:

The avoid the loss of well-posedness in the post localization range, some continuum damage theories for elastic materials introduce higher order gradients of the damage variable into constitutive model. Although such theories allow for mathematically correct modelling of the strain localization phenomena, they are usually considered to be very complex to handle from the numerical point of view. The present work deals with the numerical implementation of a gradient-enhanced damage theory for elastic materials. A simple numerical technique, based on the finite element method, is proposed to approximate the solution to the resulting nonlinear mathematical problems. The coupling between damage and strain variables is circumvented by means of a splitting technique.
Celem poprawności sformułowania problemu w pewnych teoriach zniszczenia do modelu konstytutywnego materiałów sprężystych wprowadza się wyższe gradienty zmiennych opisujących zniszczenie. Chociaż teorie takie umożliwiają matematycznie poprawne modelowanie zjawisk lokalizacji odkształceń, to z punktu widzenia numeryki stosowanie ich uważa się zwykle za bardzo skomplikowane. W niniejszej wersji przedstawiono zastosowanie numeryczne teorii zniszczenia z wyższymi gradientami do materiałów sprężystych. Do przybliżonego rozwiązania otrzymanych nieliniowych zadań matematycznych zaproponowano prostą metodę numeryczną opartą na metodzie elementów skończonych. Użycie metody operatorowej pozwoliło uniknąć sprężenia między zmiennymi opisującymi zniszczenie i odkształcenie.

Źródło:

Journal of Theoretical and Applied Mechanics; 1999, 4; 847-861
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

The magnetically loaded noncontact couple between valve tip and surface of cam follower or rocker arm

Autorzy:

Siczek, K.

Powiązania:

https://bibliotekanauki.pl/articles/242240.pdf

Data publikacji:

2011

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

combustion engine
valvetrain elements
permanent magnets

Opis:

The lightweight valves are more and more commonly used in cam and camless valvetiming in combustion engine. They can be made as drilled steel valves or as full but of TiAl alloys or of ceramic material. They usually can mate with the same valve guides and seat inserts made of cast iron, as in case of the standard full steel valves. Sometimes in the high speed engine, the valve insert should be made of chromium steel and valve guides of phosphorous bronze. The one of sources for wear and for resistance of motion for valve is a friction contact area between the valve tip and the surface of rocker arm or of cam follower. To minimize the wear the valve tip should be hardened or have a special hard cup, which makes greater mass of the valve. To avoid the wear and friction resistance in such contact area the mentioned friction contact can be eliminated. Such friction contact type can be replaced by a noncontact couple loaded by magnetic field force. Such solution requires introducing the set of the cylindrical permanent magnet fixed to nonmagnetic valve tip and of the similar magnet fixed to the bottom face of a cam follower or of the set of small plane magnets on the cam surface. The cam should be made of nonmagnetic material either. The model of such assembly of magnets has been made with the help of the finite element method. The values of magnetic force loading noncontact couple have been obtained for some configurations of magnets and for different positions for elements of valvetrain and presented in the article.

Źródło:

Journal of KONES; 2011, 18, 2; 397-403
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

As and Pb and their potential source in the hair of residents of Cracow

Autorzy:

Kicińska, A.
Jelonek-Waliszewska, A.

Powiązania:

https://bibliotekanauki.pl/articles/1190158.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza

Tematy:

environmental contamination
potential harmful elements
factors

Opis:

The hair content of arsenic and lead of residents of Cracow, an agglomeration with nearly one -million population, was determined and compared to those of inhabitants of Lubasz (a village with around 3,200 population in central Poland). The sample material (composed of scalp hair samples) was collected in July and August of 2014. The residents who agreed to participate in the test had to be over eighteen years old and in the case of Cracow have been living there for at least two years. The maximum values reached 0.278 mg kg-1 arsenic and 31.7 mg kg-1 lead, and those of lead were determined in the samples collected in Lubasz. The highest mean content of arsenic (0.077 mg kg-1) was obtained for residents of Dębniki, a district of Cracow. The impact of the quality of the environment in which the tested persons lived as well as other selected factors that can affect their hair arsenic and lead content (for example: gender, age, state of health, work place, type of food, smoking, drinking) was assessed. The results have confirmed the general knowledge that a proper diet and a clean, unaffected environment are basic factors minimizing the adverse impact of arsenic and lead on human beings. The factors whose influence on the hair content of arsenic and lead were considered are: the place of residence, occupational exposure, sex, age, diet, alcohol consumption and hair colour. Due to the small number of samples that have been examined this is a pilot study.

Źródło:

Journal of Elementology; 2017, 22, 2; 517-528
1644-2296

Pojawia się w:

Journal of Elementology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Chemometric evaluation of concentrations of trace elements in intervertebral disc tissue in patient with degenerative disc disease

Autorzy:

Kubaszewski, Łukasz
Zioła-Frankowska, Anetta
Gasik, Zuzanna
Frankowski, Marcin
Dąbrowski, Mikołaj
Molisak, Bartłomiej
Kaczmarczyk, Jacek
Gasik, Robert

Powiązania:

https://bibliotekanauki.pl/articles/987050.pdf

Data publikacji:

2017

Wydawca:

Instytut Medycyny Wsi

Tematy:

intervertebral disk
degeneration
trace elements
chemometrics

Opis:

Background. The work is designed to uncover the pattern of mutual relation among trace elements and epidemiological data in the degenerated intervertebral disk tissue in humans. Hitherto the reason of the degenerative process is not fully understood. Trace elements are the basic components of the biological compound related both its metabolism as well as environmental exposure. The relation pattern among elements occurs gives new perspective in solving the cause of the disease. Methods. We have analysed trace elements content in the 30 intervertebral disc from 22 patients with degenerative disc disease. The concentrations of Al, Cu, Cd, Mo, Ni and Pb were determined with Atomic Absorption Spectrometry. To analyse the multidimentional relation between trace element concentration and epidemiological data the chemometric analysis was applied. Results. The similarity have been shown in occurrence of following pairs: Cd-Mo as well as Mg-Zn. The second pair was correlated with Pb concentration. Pb levels are observed to be competitive to Cu concentration. Cd concentration was related to Zn and Mg deficiency. No single but rather cluster of epidemiological data show observable influence on the TE tissue variance. Zn and Cu was related to the male sex. Operation with orthopedic implants were related to combined Al, Mo and Zn concentration. Conclusions. This is the first chemometric analysis of trace elements in disk tissue. It shows multidimentional relations that are missed by the classical statistic. The analysis shows significant relation. The nature of the relations is the basis for further metabolic and environmental research.

Źródło:

Annals of Agricultural and Environmental Medicine; 2017, 24, 4
1232-1966

Pojawia się w:

Annals of Agricultural and Environmental Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Morphometric analysis in investigations of the coastal zone. Part I. Separation of morphological elements and scope of morphometric measurements

Autorzy:

Dubrawski, R.

Powiązania:

https://bibliotekanauki.pl/articles/111415.pdf

Data publikacji:

2001

Wydawca:

Instytut Morski w Gdańsku

Tematy:

coastal zone
morphological elements
morphometric parameters

Opis:

Hypsometric and bathymetric measurements of the Polish coastal zone, which were carried out since the early 50 ties of the last century, provided a very large amount of empirical material. Standardisation of profile recordings in the Coastal·Zone Databank provided a basis for the determination of the multi-temporal changes of the coast. Comparative analysis of coastal zone profiles is of basic importance in planning coastal protection and in designing coastal defence methods. For this aim morphological elements of the shore (beach and dune) and the nearshore (from waterline seawards) zones were separated, and measurements were made on profiles drawn in identical scale. In the present paper, methods of separating morphological elements and the scope of morphometric measurements on cross-shore profiles are presented. The next parts shall discuss: the methods of analysing morphometric parameters (part II), the methods of determining the erosion/accretion systems (part III), and the use of morphometric analysis in the protection of selected regions of the Polish coast (part IV).

Źródło:

Biuletyn Instytutu Morskiego w Gdańsku; 2001, 28, 1; 39-53
1230-7424
2450-5536

Pojawia się w:

Biuletyn Instytutu Morskiego w Gdańsku

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 47.

Tytuł:

Content and uptake of selected trace elements by weeds in potato to cultivation under different conditions of soil tillage and weed control methods

Autorzy:

Zarzecka, K.
Gugała, M.
Baranowska, A.

Powiązania:

https://bibliotekanauki.pl/articles/124723.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

weeds
trace elements
content
uptake
potato

Opis:

The study utilized data from a field experiment carried out at the Experimental Station in Zawady owned by the University of Natural Sciences and Humanities in Siedlce in the years 2005–2007. The experimental factors included two soil tillage systems and seven weed control methods in potato. Iron, copper and zinc in weeds were deter- mined with the AAS method. The trace element content in weed dry matter before row closure of potato depended significantly on soil tillage methods (excluding Cu), weed control methods and weather conditions, and, prior to tuber harvest, on soil tillage and weather conditions during the growing season. The uptake of Fe, Cu, and Zn by weeds from the area of 1 hectare depended on the experimental factors, weed biomass and weed chemical composition.

Źródło:

Journal of Ecological Engineering; 2014, 15, 4; 131-136
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 48.

Tytuł:

Computer Aided Development of the Innovative Incremental Forming Process

Autorzy:

Szyndler, J.
Madej, Ł.
Grosman, F.

Powiązania:

https://bibliotekanauki.pl/articles/99760.pdf

Data publikacji:

2014

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

incremental forming
integral elements
numerical modelling

Opis:

Computer aided design of innovative incremental forming process dedicated to manufacturing integral elements for aerospace industry is the main aim of the present work. Description of the proposed incremental forging idea as well as details of the developed numerical models are presented within the paper. First, a simple model of a single anvil indentation was created to evaluate material behaviour under different pressing depths. Then a complete numerical model of developed incremental forming press was proposed. Finally, obtained results in the form of strain distribution and recorded forging loads are presented and compared with results from conventional forming model.

Źródło:

Journal of Machine Engineering; 2014, 14, 1; 84-93
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 49.

Tytuł:

Deformation of semicircular and circular laws via p-adic number fields and sampling of primes

Autorzy:

Cho, Ilwoo
Jorgensen, Palie E. T.

Powiązania:

https://bibliotekanauki.pl/articles/255649.pdf

Data publikacji:

2019

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

free probability
primes
p-adic number fields
Banach *-probability spaces semicircular elements
circular elements
truncated linear functionals

Opis:

In this paper, we study semicircular elements and circular elements in a certain Banach *-probability space [formula] induced by analysis on the p-adic number fields Qp over primes p. In particular, by truncating the set P of all primes for given suitable real numbers t < s in R, two different types of truncated linear functionals [formula], and [formula] re constructed on the Banach *-algebra [formula]. We show how original free distributional data (with respect to r°) are distorted by the truncations on P (with respect to [formula], and [formula]). As application, distorted free distributions of the semicircular law, and those of the circular law are characterized up to truncation.

Źródło:

Opuscula Mathematica; 2019, 39, 6; 773-813
1232-9274
2300-6919

Pojawia się w:

Opuscula Mathematica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:

Wpływ nałogu palenia na interakcje pierwiastków fizjologicznych z Mo, Li, Ti, Sr w strukturze mineralnej złogów pęcherzyka żółciowego
Effects of smoking addiction on the interactions of physiological elements with Mo, Li, Ti, Sr in the mineral structure of gallbladder deposits

Autorzy:

Musielińska, R.
Kwapuliński, J.
Szady, B.
Szady, A.

Powiązania:

https://bibliotekanauki.pl/articles/410261.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Humanistyczno-Przyrodniczy im. Jana Długosza w Częstochowie. Wydawnictwo Uczelniane

Tematy:

złogi pęcherzyka żółciowego
interakcje
nałóg palenia
pierwiastki śladowe
pierwiastki odnośnikowe
gallstones
interactions
smoking
trace elements
reference elements

Opis:

Celem badań było określenie kierunku zmian zawartości Ti, Li, Mo, Sr w nawiązaniu do zmian zawartości czterech podstawowych pierwiastków fizjologicznych (Mg, K, Ca, Na) w strukturze mineralnej hydroksyapatytów złogów pęcherzyka żółciowego, na podstawie analizy zmian ilorazów przeciętnej zawartości badanych pierwiastków w hydroksyapatytach złogów pęcherzyka żółciowego i zawartości poszczególnych metali traktowanych jako odnośnikowe. Zawartość pierwiastków w złogach pęcherzyka żółciowego pozyskanych podczas cholecystektomii oznaczano metodą emisyjnej spektrometrii z plazmą wzbudzoną indukcyjnie (ICP-AES) z wykrywalnością 0,01µg/g. Obecność i kierunek zmian badanych pierwiastków w złogach pęcherzyka żółciowego obrazowana ilorazem przeciętnej zawartości danego pierwiastka Me+n i przeciętnej zawartości pierwiastków odnośnikowych Me+k jest determinowana płcią, nałogiem palenia oraz miejscem zamieszkania w zależności od stopnia zanieczyszczenia powietrza tymi pierwiastkami. Graficzny obraz zmian ilorazu Me+n/Me+k w odniesieniu do przeciętnej zawartości pozostałych pierwiastków odnośnikowych - Me+k wchodzących w skład struktury mineralnej złogów pęcherzyka żółciowego pozwala wskazać na znaczenie fizjologiczne danego pierwiastka w procesie jego złożonej kumulacji w patogenie.
The aim of this study was to determine the direction of changes in the content of Ti, Li, Mo, Sr in relation to changes in the content of four basic physiological elements (Mg, K, Ca, Na) in the mineral structure of hydroxyapatites of gallbladder deposits, on the basis of the analysis of changes in the quotient of the average content of the tested elements in hydroxyapatites of gallbladder deposits and the content of individual metals treated as references. The content of elements in gallstones deposits obtained during cholecystectomy was determined by inductively induced plasma emission spectrometry (ICP-AES) with a detection rate of 0,01µg/g. The presence and direction of changes in the examined elements in the gallbladder deposits, illustrated by the quotient of the average content of a given Me+n element and the average content of the Me+k reference elements, is determined by sex, smoking addiction and place of residence depending on the degree of air pollution with these elements. The graphical picture of changes in the Me+n/Me+k ratio in relation to the average content of other reference elements - Me+k, which are part of the mineral structure of gallstones deposits - allows to indicate the physiological significance of a given element in the process of its complex accumulation in pathogenesisethods.

Źródło:

Chemistry, Environment, Biotechnology; 2018, 21; 30-37
2083-7097

Pojawia się w:

Chemistry, Environment, Biotechnology

Dostawca treści:

Biblioteka Nauki

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