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Wyświetlanie 1-15 z 89
Tytuł:
Investigation on inertia characteristics of corncobs
Badania inercyjnych właściwości kolb kukurydzy
Autorzy:
Kuzenko, D.
Kuzenko, L.
Vantukh, Z.
Powiązania:
https://bibliotekanauki.pl/articles/8735543.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
inertia characteristics
corn cob
inertia moment
separate mechanism
pulling speed
corn
harvesting
Źródło:
Acta Scientiarum Polonorum. Technica Agraria; 2010, 09, 3-4; 19-27
1644-0684
Pojawia się w:
Acta Scientiarum Polonorum. Technica Agraria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nature of Inertia forces
Autorzy:
Baurov, Yu. A.
Powiązania:
https://bibliotekanauki.pl/articles/412012.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
byuon
new force
inertia forces
Opis:
The physical nature of inertia forces is shown on the base of theory of byuons, the theory of “life’ of special unobservable discrete objects – byuons from which the surrounding physical space (dark matter) and the world of elementary particles are formed. The theory of byuons predicts a new non-gauge force of nature which explains of physical nature of inertia forces.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 10; 14-24
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduction of Deformations during Welding Metal Wire Mesh with Frames
Autorzy:
Krawczyk, R.
Słania, J.
Powiązania:
https://bibliotekanauki.pl/articles/356539.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
welding
stresses
deformations
moment of inertia
Opis:
The article presents an issue referring to a reduction of deformation during welding metal wire mesh into the frames. A problem of a possible reduction of deformations was described taking into account characteristics of a construction of a welded element. Technological tests and their results are provided. Technological recommendations relating to the reduction of deformations of the welded element are given.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 529-534
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deflection of Steel Reinforced Concrete Beam Prestressed with CFRP Bar
Autorzy:
Selvachandran, P.
Anandakumar, S.
Muthuramu, K. L.
Powiązania:
https://bibliotekanauki.pl/articles/353032.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cracked moment of inertia
deformability
effective moment of inertia
neutral axis
Partial Prestressig Ratio
yielding point
Opis:
Carbon Fiber Reinforced polymer (CFRP) bars are weak in yielding property which results in sudden failure of structure at failure load. Inclusion of non-pretensioned steel reinforcement in the tension side of CFRP based prestressed concrete beam will balance the yielding requirements of member and it will show the definite crack failure pattern before failure. Experimental investigation has been carried out to study the deflection behavior of partially prestressed beam. Experimental works includes four beam specimens stressed by varying degree of prestressing. The Partial Prestressing Ratio (PPR) of specimen is considered for experimental works in the range of 0.6 to 0.8. A new deflection model is recommended in the present study considering the strain contribution of CFRP bar and steel reinforcement for the fully bonded member. New deflection model converges to experimental results with the error of less than 5% .
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1915-1922
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scientific bases of creation of dust catchers
Autorzy:
Batluk, V.
Powiązania:
https://bibliotekanauki.pl/articles/410869.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
dust catchers
centrifugal - inertia vehicles
mathematical model
Opis:
The mathematical model of process of portale and besieging of hard particles from the dust stream of vertical vehicles is examined in the article. The calculation chart of dust catcher of vertical vehicles is built with the jalousie separator of a new principle type.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2012, 1, 4; 3-7
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic analysis of torsional discrete-continuous systems with position-dependent variable inertia
Autorzy:
Pielorz, A.
Powiązania:
https://bibliotekanauki.pl/articles/279507.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
variable inertia
discrete-continuous systems
wave approach
Opis:
In the paper, dynamic investigations of multi-mass discrete-continuous systems torsionally deformed are performed taking into account the position-dependent mass moment of inertia of one of rigid bodies. It is assumed that the rigid body representing a motor moves with a variable velocity. An originally nonlinear problem is linearized, and the wave approach leading to solving equations with a retarded argument having variable coefficients is used for the solution. Exemplary numerical calculations are done for a three-mass system.
Źródło:
Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 107-115
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal dynamics of a building
Autorzy:
Matysko, R.
Dyczkowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/175263.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transient model
thermal loss
thermal inertia
building
Opis:
The work presents the thermal dynamics of the building. The mathematical model covers the issues of heat exchange and temperature control in the room due to changing environmental conditions. The presented work describes the operation of the control system due to thermal losses and thermal inertia of the building. Mathematical model introduces a new method of thermal loss analysis in the conditions of variable thermal dynamics of the building.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2018, 141; 31-40
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The inertia of unicyclic graphs and bicyclic graphs
Autorzy:
Liu, Ying
Powiązania:
https://bibliotekanauki.pl/articles/728942.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
matching number
inertia
nullity
unicyclic graph
bicyclic graph
Opis:
Let G be a graph with n vertices and ν(G) be the matching number of G. The inertia of a graph G, In(G) = (n₊,n₋,n₀) is an integer triple specifying the numbers of positive, negative and zero eigenvalues of the adjacency matrix A(G), respectively. Let η(G) = n₀ denote the nullity of G (the multiplicity of the eigenvalue zero of G). It is well known that if G is a tree, then η(G) = n - 2ν(G). Guo et al. [Ji-Ming Guo, Weigen Yan and Yeong-Nan Yeh. On the nullity and the matching number of unicyclic graphs, Linear Algebra and its Applications, 431 (2009), 1293-1301.] proved if G is a unicyclic graph, then η(G) equals n - 2ν(G) - 1, n-2ν(G) or n - 2ν(G) + 2. Barrett et al. determined the inertia sets for trees and graphs with cut vertices. In this paper, we give the nullity of bicyclic graphs ₙ⁺⁺. Furthermore, we determine the inertia set in unicyclic graphs and ₙ⁺⁺, respectively.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2013, 33, 1; 109-115
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implications of inertia for hydroelastic instability of Herschel-Bulkley fluids in plane poiseuille flow
Autorzy:
Jafargholinejad, S.
Najafi, M.
Powiązania:
https://bibliotekanauki.pl/articles/280168.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
inertia
instability
Herschel-Bulkley fluid
Mooney-Rivlin solid
Opis:
This study investigates the effects of inertia on the hydroelastic instability of a pressure- -driven Herschel-Bulkley fluid passing through a two-dimensional channel lined with a polymeric coating. The no-viscous hyperelastic polymeric coating is assumed to follow the two-constant Mooney-Rivlin model. In this work, analytical basic solutions are determined for both the polymeric gel and the fluid at very low Reynolds numbers. Next, the basic solutions are subjected to infinitesimally-small, normal-mode perturbations. After eliminating the nonlinear terms, two 4-th order differential equations are obtained. The equations with appropriate boundary conditions are then numerically solved using the shooting method. The results of the solution show that the inertia terms in the perturbed equations destabilize the pressure-driven Herschel-Bulkley fluid flow. The investigation reveals that the elastic parameter has a stabilizing effect on the flow. Also, based on the obtained results, the yield stress, depending on the power-law index, has a stabilizing or destabilizing effect on the flow. Since in this work the inertia terms are included in the pertinent governing equations, therefore, the results of this study are much more realistic and reliable than previous works in which inertia terms were absent. In addition, unlike the previous works, the present study considers both the shear-thinning and shear-thickening types of fluids. Hence, the results of this work embrace all the fluids which obey the Herschel-Bulkley model.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 4; 1205-1216
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of dynamic growth of a micro-scaled void based on strain gradient elasto-plasticity
Autorzy:
Ma, Xinbing
Liu, Jinxing
Wang, Jiadong
Pan, Hao
Powiązania:
https://bibliotekanauki.pl/articles/1839598.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
dynamic void growth
size effect
inertia
thermal softening
Opis:
Void initiation and growth serve as an important mechanism in ductile failures in metals. Particularly, on the micron-level, the extra hardening effect associated with strain gradient is accounted for by adopting strain gradient elasto-plasticity instead of the conventional plasticity. Effects of inertial, strain gradient hardening and thermal softening are formulated analytically for the case where a spherical void expands under external hydrostatic stress. As demonstrated by our results, the inertia effect firstly tends to hinder but then promotes the void growth. The threshold stress required for rapid void growth is lifted due to extra hardening of strain gradient so that the growth of a smaller void is delayed more remarkably. A considerable thermal softening phenomenon is observed here, which is caused by plastic work during the deformation process. The final void growth rate is mainly related to the maximum loading, which is consistent with the prediction based on the classical plastic theory.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 4; 927-941
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Polish mutual funds performance: a Markovian approach
Autorzy:
Filip, Dariusz
Rogala, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1363627.pdf
Data publikacji:
2021-03-03
Wydawca:
Główny Urząd Statystyczny
Tematy:
Markov chain
smart money effect
effectiveness
performance inertia
Opis:
The aim of this study is to determine whether mutual funds provide benefits for their clients. The performance of Polish mutual funds has been evaluated in terms of their efficiency, including their potential inertia over time. Moreover, the use of the phenomenon of economies of scale resulting from assets inflow to the fund by means of the Markovian framework has been examined. The results are consistent with the efficient market hypothesis. When assessing the market-adjusted returns, underperformance was noticed in both small and large funds. The smart money effect, recognised in the literature, is not confirmed here; however, there are some noticeable investor reactions, such as the phenomenon of chasing performance.
Źródło:
Statistics in Transition new series; 2021, 22, 1; 115-130
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O względności bezwładności. Uwagi dotyczące ostatniej hipotezy Einsteina (Przedstawione na spotkaniu 31 III 1917)
On the relativity of inertia. Remarks concerning Einstein’s latest hypothesis
Autorzy:
de Sitter, Willem
Powiązania:
https://bibliotekanauki.pl/articles/690934.pdf
Data publikacji:
2017
Wydawca:
Copernicus Center Press
Tematy:
general relativity
inertia
Willem de Sitter
Albert Einstein
Opis:
W. de Sitter, „On the relativity of inertia. Remarks concerning Einstein’s latest hypothesis”, Proceedings of the Section of Sciences. Koninklijke Akademie van Wetenschappen te Amsterdam, Vol. XIX, No. 9 i 10, Johannes Müller, Amsterdam, September 1917, pp. 1217–1225 (section: „Mechanics”). Translated to Polish by Robert Janusz.
Źródło:
Zagadnienia Filozoficzne w Nauce; 2017, 63; 205-222
0867-8286
2451-0602
Pojawia się w:
Zagadnienia Filozoficzne w Nauce
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematic model of the process of dust catching in an apparatus with a movable separator
Autorzy:
Batluk, V.
Basov, M.
Dorundyak, L.
Powiązania:
https://bibliotekanauki.pl/articles/410724.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
odpylacze
modelowanie matematyczne
dust catchers
inertia vehicles
mathematical model
Opis:
The article considers the mathematical model of the process of cleaning of dust-laden stream in centrifugal - inertia vehicles and the obtained designs are confirmed by conducting complex processes of dust colection in radioelectronics. The article describes new trends in the development of dust catching apparatuses based on the use of centrifugal-inertial forces, permitting to significantly improve the effectiveness of dust catching.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2012, 1, 1; 13-16
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fatigue crack detection method using analysis of vibration signal
Autorzy:
Rychlik, A.
Ligier, K.
Powiązania:
https://bibliotekanauki.pl/articles/297839.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
fatigue cracking
diagnostic signal
force of inertia
microscopic examination
Opis:
This paper discusses the method used to identify the process involving fatigue cracking of samples on the basis of selected vibration signal characteristics. Acceleration of vibrations has been chosen as a diagnostic signal in the analysis of sample cross section. Signal characteristics in form of change in vibration amplitudes and corresponding changes in FFT spectrum have been indicated for the acceleration. The tests were performed on a designed setup, where destruction process was caused by the force of inertia of the sample. Based on the conducted tests, it was found that the demonstrated sample structure change identification method may be applied to identify the technical condition of the structure in the aspect of loss of its continuity and its properties (e.g.: mechanical and fatigue cracks). The vibration analysis results have been verified by penetration and visual methods, using a scanning electron microscope.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(1); 63-74
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Capability of synchronous machines to ride through events with high ROCOF
Autorzy:
Assenkamp, Alf
Kreischer, Christian
Kulig, Stefan
Powiązania:
https://bibliotekanauki.pl/articles/140451.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ROCOF
under-excitation protection
turbo-generator
low-inertia grids
Opis:
The transition of power grids to implement large amounts of nonsynchronous renewables reduces the inertia in the power system. Therefore, the rate of change of fre- quency (ROCOF) after a fault of given energy is higher in low inertia grids than in grids with mainly synchronous machines operating. Standard faults for the design of existing synchronous machines assume fixed frequency grids, in which an electrically close fault happens. It is not tested, if the machines can ride through transient disturbances with high ROCOF. For ROCOF values of up to 1 Hz/s as foreseen for the upcoming grid code of the Republic of Ireland and up to 2 Hz/s for Northern Ireland, a thorough verification, if generators are capable to ride through such events is necessary. For this study, ROCOF frequency traces provided by the transmission system operators (TSOs) of Ireland were first benchmarked with a full-grid model and in a second step impressed on a model of generators connected to the power grid via a step-up transformer to study transient stability and nonlinear response of the generator. This paper focusses on the ability of nine different synchronous machines to stay connected to the transmission system during severe ROCOF events without losing synchronism.
Źródło:
Archives of Electrical Engineering; 2019, 68, 2; 325-339
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 89

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