Filtry
wszystkich: 2542
-
Katalog
wyświetlamy 1000 najlepszych wyników Pomoc
Wyniki wyszukiwania dla: FREE DECAY VIBRATIONS
-
Simple adaptive cubic spline interpolation of fluorescence decay functions
PublikacjaZaproponowano prostą metodę interpolacji funkcji zaniku fluorescencji. W pierwszym kroku interpolowany zanik jest całkowany za pomocą adaptacyjnego algorytmu wykorzystującego kwadratury Newtona-Cotesa. Uzyskiwana w ten spoób siatka wartości czasu jest używana w drugim kroku polegającym na typowej interpolacji za pomocą funkcji sklejanych trzeciego stopnia.
-
Nonsense-Mediated mRNA Decay: Pathologies and the Potential for Novel Therapeutics
Publikacja -
Stability evaluation of the marine propulsion unit mechanical system bymeans of vibrations measurements and their analysis.
PublikacjaIn paper selected issues concerning vibration diagnosis of the mechanical system within marine propulsion units have been given. The analysis of vibration parameters was carried out on the basis of experimental examinations of a real object in which an exceedance of the allowable vibration's level had been observed. In the beginning, the vibration apparatus being on laboratory equipment of the Department of Ship Power Plants of...
-
Independence in uniform linear triangle-free hypergraphs
PublikacjaThe independence number a(H) of a hypergraph H is the maximum cardinality of a set of vertices of H that does not contain an edge of H. Generalizing Shearer’s classical lower bound on the independence number of triangle-free graphs Shearer (1991), and considerably improving recent results of Li and Zang (2006) and Chishti et al. (2014), we show a new lower bound for a(H) for an r-uniform linear triangle-free hypergraph H with r>=2.
-
An optimal form of the finite element mass matrix in the analysis of longitudinal vibrations of rods
PublikacjaIn this paper, an attempt is made to find the optimal form of the mass matrix of a rod finite element, which allows one to obtain the smallest errors in the longitudinal frequency determination of natural vibrations of any boundary conditions within the whole range of determined frequencies. It is assumed that the mass matrix can be treated as a linear combination of the consistent and diagonal matrices. Based on analytical considerations,...
-
Electromagnetic forced vibrations of composite nanoplates using nonlocal strain gradient theory
PublikacjaThis article is intended to analyze forced vibrations of a piezoelectric-piezomagnetic ceramic nanoplate by a new refined shear deformation plate theory in conjunction with higher-order nonlocal strain gradient theory. As both stress nonlocality and strain gradient size-dependent effects are taken into account using the higher-order nonlocal strain gradient theory, the governing equations of the composite nanoplate are formulated....
-
INTERFACES AND FREE BOUNDARIES
Czasopisma -
Circular saw vibrations or dynamics of the spindle
PublikacjaSawing of wood with circular saws is a typical example of cutting with multi-blade tools. In that kind of cutting, theposition accuracy of following tool blades is a crucial factor which affects the cutting process and machining final effects.Position tooth errors may cause deterioration in cutting conditions, changes in loads of individual teeth and the tool as a whole,and also a decrease in accuracy and surface quality after...
-
Modes of vibrations occuring in the washboarding phenomenon
PublikacjaW oparciu o współczesną literaturę oraz wyniki badań własnych przedstawiono teorie zjawiska washboarding dla obróbki na pilarkach taśmowych z użyciem wąskich i szerokich pił. Zaprezentowano również wytłumaczenie wspomnianego zjawiska dla przypadku obróbki na pilarkach ramowych. Poprzez analogię do drgań typu chatter (drgania samowzbudne w obróbce metali) zaproponowano nazwy regenerative washboarding, dla drgań samowzbudnych na...
-
The analysis of mechanical vibrations with use of the MATHCAD.
PublikacjaPrzedstawiono zagadnienie analizy drgań mechanicznych ze wspomaganiem komputerowym za pomocą programu MATHCAD. Omówiono zagadnienia zastosowania programu w edukacji i w obliczeniach inżynierskich.
-
Modelling of vibrations of a liquid filled tank
PublikacjaPrzeprowadzono analizę teoretyczną i numeryczną zbiorników długich i krótkich wypełnionych całkowicie lub częściowo cieczą. Wyznaczenie obciążeń hydrodynamicznych dotyczy bezpośrednio wytrzymałości konstrukcji samego zbiornika, a przez to pozwala określić wytrzymałość konstrukcyjną całego kadłuba. Szczególne wymagania stawiane są zbiornikom do przewozu cieczy radioaktywnych, gdyż należy zapewnić bardzo wysoki stopień bezpieczeństwa...
-
Decay properties of unstable Tonks-Girardeau gases from a split trap
Publikacja -
Experimental and numerical study on polymer element used for reduction of temporary steel grandstand vibrations
PublikacjaThe purpose of the paper is to analyse the effectiveness of a polymer damper in reduction of a temporary steel grandstand vibrations through the experimental and numerical study. The damper considered in the investigation is constructed out of two L-shape steel members bonded with polymer mass of high damping properties. The element has been installed as a diagonal one at the back part of the structure. The method has been compared...
-
Preliminary results from HEDGEHOG REXUS Project - sounding rocket experiment on accelerations, vibrations and heat flow
PublikacjaAs access to space conditions becomes more available, both technically and economically, scientists' interest in launching finer and more sophisticated experiments grows. This applies now more than ever to fragile by nature biological and chemical experiments. To be qualified for launch, such experiments need to be carefully tested prior to the event. The tests should represent actual launch conditions as closely and in as detailed...
-
Decoherence-free communication over multiaccess quantum channels
PublikacjaIn this paper we consider decoherence-free communication over multiple access and k-user quantum channels. First, we concentrate on a hermitian unitary noise model U for a two-access bi-unitary channel and show that in this case a decoherence-free code exists if the space of Schmidt matrices of an eigensubspace of U exhibits certain properties of decomposability. Then, we show that our technique is also applicable for generic random unitary...
-
On the size of identifying codes in triangle-free graphs
PublikacjaIn an undirected graph G, a subset C⊆V(G) such that C is a dominating set of G, and each vertex in V(G) is dominated by a distinct subset of vertices from C, is called an identifying code of G. The concept of identifying codes was introduced by Karpovsky, Chakrabarty and Levitin in 1998. For a given identifiable graph G, let gammaID(G) be the minimum cardinality of an identifying code in G. In this paper, we show that for any connected...
-
Lefschetz periodic point free self-maps of compact manifolds
PublikacjaLet f be a self-map of a compact connected manifold M. We characterize Lefschetz periodic point free continuous self-maps of M for several classes of manifolds and generalize the results of Guirao and Llibre [J.L.G. Guirao, J. Llibre, On the Lefschetz periodic point free continuous self-maps on connected compact manifolds,
-
Lefschetz periodic point free self-maps of compact manifolds
PublikacjaLet f be a self-map of a compact connected manifold M. We characterize Lefschetz periodic point free continuous self-maps of M for several classes of manifolds and generalize the results of Guirao and Llibre [J.L.G. Guirao, J. Llibre, On the Lefschetz periodic point free continuous self-maps on connected compact manifolds, Topology Appl. 158 (16) (2011) 2165-2169].
-
Computational methods for calculation of binding free energy for ligand-receptor complexes
PublikacjaAccurate description of the molecular complexes energetic influence is required for understanding of many biological functions carried out by proteins. Therefore, estimation of binding free energy for ligand-receptor complexes is of highest importance for structure-based ligand design and drug discovery approaches.Experimental methods of determination of difference in Gibbs'es free energy have many limitations. Thus, computational...
-
TEMPERATURE AND RELATIVE HUMIDITY CONTROL IN MASS AND DECAY PREVENTION IN POSTHARVEST HANDLING OF PEACHES
Publikacja -
Raman scattering tensors for translational vibrations of ice
Publikacja -
Chladni and circular saw disc vibrations visualisation
PublikacjaIn this paper are described some methods for saw disc vibration monitoring in march of time (chronology). Ernst Chaldni, the father of sound visualisation and his patternsis are mentioned. In the last partof article are introduced results received with authors measuring systems.
-
Viscoplastic analysis of damped vibrations of circular plate
PublikacjaGłównym celem artykułu jest przedstawienie procedury do nieliniowej statycznej i dynamicznej analizy MES z lepkoplastycznym prawem Bodnera-Partoma. Przedstawione są podstawowe równania modelu konstytutywnego wraz z koncepcją implementacji do komercyjnego programu MSC.Marc przy użyciu procedury UVSCPL. Przedstawiono przykład analizy numerycznej płyty kołowej, zweryfikowany eksperymentalnie. Dodatkowo przedstawiono koncepcje wyznaczania...
-
Friction induced vibrations in sliding of monolithic alumina
PublikacjaPrzedstawiono wyniki badań wzbudzania się (i ewentualnie - zaniku) drgań mechanicznych towarzyszących tarciu ślizgowemu próbek o płaskiej powierzchni styku, wykonanych z monolitycznego tlenku aluminium. Badano wpływ wymuszeń tribologicznych oraz dynamicznych cech układu badawczego na przebieg zjawiska.
-
Reduction of steel chimney vibrations with a pendlum damper.
PublikacjaKarman vortices observed around chimneys may induce dangerous structural vi-brations at certain wind velocities. The aim of this paper is to analyse theeffectiveness of pendulum damper in vibration reduction of a steel chimney. A two degree-of-freedom system is used to model the behaviour of the struc-ture equipped with a damper. The results of the study show that the use of pendulum with tuned frequency leads to significant...
-
Preliminary results from HEDGEHOG REXUS project – A sounding rocket experiment on accelerations, vibrations and heat flow
PublikacjaDuring flight, a sounding rocket is subject to a unique environment - severe vibrations and substantial heat flux. In order to design payloads, precise measurement of these conditions is required. This paper presents preliminary results from HEDGEHOG REXUS Project, whose scientific goal was to characterise the thermal and dynamic environment of REXUS sounding rockets. For this purpose, two new sensors have been designed - mechanical...
-
Determination of free tyrosine in equestrian supplements by LC–MS/MS and comparison of its quantity with total free amino acids content in view of doping control
PublikacjaThe reports on the probable beneficial impact of tyrosine (TYR) supplementation on performance enhancement have contributed to the growth of interest in TYR in equestrian sports field and related industries, such as the manufacture of dietary and nutritional supplements. In this study, the first attempt to the assessment of horses exposure to TYR during nutritional supplementation was demonstrated by quantification of unbound TYR...
-
Extending loophole-free nonlocal correlations to arbitrarily large distances
PublikacjaQuantum theory allows spatially separated observers to share nonlocal correlations, which enable them to accomplish classically inconceivable information processing and cryptographic feats. However, the distances over which nonlocal correlations can be realized remain severely limited due to their high fragility to noise and high threshold detection efficiencies. To enable loophole- free nonlocality across large distances, we introduce...
-
The Opening of Central and Eastern European Countries to Free Trade: A Critical Assessment
PublikacjaThree decades after the fall of the Berlin wall and one and a half decades after the Big Bang enlargement of the European Union (2004-2007), we revisit contrasting narratives about the benefit of both free trade and the EU enlargement for Central and Eastern European (CEE) countries. We distinguish old, pre-2004 EU countries from CEE countries that joined the EU in 2004-2007, as well as from the CEE countries that have not become...
-
Free convection of water-Al2O3 nanofluid from horizontal porous coated tube
PublikacjaThe main aim of the present study was to investigate the influence of nanoparticles on heat transfer coefficients during free convection of water-Al2O3 nanofluid from horizontal porous coated tube under atmospheric pressure for nanoparticle concentration of 0.01% by weight. Contrary to published data present study concerns on free convection of nanofluids in extensive, quiescent fluid.
-
Monitoring of the circular saw vibrations with machine vision system.
PublikacjaPraca przedstawia metodologię wyznaczania drgań obracających się pił tarczowych z wykorzystaniem technik wizyjnych. Na podstawie otrzymanych wyników można wyznaczyc prędkości krytyczne piły oraz podac obszary prędkości zalecanych (najmniejsze wartości drgań poprzecznych piły).
-
Influence of control loop on torsional vibrations of rotating machinery.
PublikacjaRozpatrywano wpływ pętli regulacyjnej silnika diesla na dynamikę układu napędowego okrętowego. Porównano obliczenia numeryczne z badaniami eksperymentalnymi. Stwierdzono duży wpływ pętli regulacyjnej silnika diesla na dynamikę układu. W obliczeniach numerycznych skoncentrowano się na drganiach skrętnych układu napędowego okrętowego. Analizowano wpływ sztywności skrętnej sprzęgła elastycznego na amplitudy momentów skrętnych...
-
On forced vibrations of piezo-flexomagnetic nano-actuator beams
PublikacjaThe effect of excitation frequency on the piezomagnetic Euler-Bernoulli nanobeam taking the flexomagnetic material phenomenon into consideration is investigated in this chapter. The magnetization with strain gradients creates flexomagneticity. We couple simultaneously the piezomagnetic and flexomagnetic properties in an inverse magnetization. Resemble the flexoelectricity, the flexomagneticity is also size-dependent. So, it has...
-
Novel Analytic-Numerical Model of Free Convection: with Leading Edge Considered
PublikacjaA novel solution of the free convection boundary problem is represented in analytical form for velocity and temperature for an isothermal vertical plate, as an example. These fields are built as a Taylor Series in the x coordinate with coefficients as functions of the vertical coordinate (y). We restrict ourselves by cubic approximation for both functions. The basic Navier-Stokes and Fourier-Kirchhoff equations and boundary conditions...
-
Reactive extrusion of biodegradable aliphatic polyesters in the presence of free-radical-initiators: A review
PublikacjaNowadays, growing attention is being paid to the environment and sustainability, what fully justified research works focused on modification of biodegradable polymers and their composites. In this field of research reactive extrusion seems to be the most promising approach, which fits well to sustainable development strategy. In In the present work, the in-situ modification of biodegradable aliphatic polyesters and the compatibilization...
-
Effect of Temperature and Nanoparticle Concentration on Free Convective Heat Transfer of Nanofluids
PublikacjaA theoretical analysis of the influence of temperature and nanoparticle concentration on free convection heat transfer from a horizontal tube immersed in an unbounded nanofluid was presented. The Nusselt (Nu) number and heat transfer coefficient were parameters of the intensity of the convective heat transfer. For free convection, the Nu number was a function of the Rayleigh (Ra) number and Prandtl (Pr) number. The Rayleigh (Ra)...
-
Free Convection Heat Transfer from Horizontal Cylinders
PublikacjaThe results of experimental investigation of free convection heat transfer in a rectangular container are presented. The ability of the commonly accepted correlation equations to reproduce present experimental data was tested as well. It was assumed that the examined geometry fulfils the requirement of no-interaction between heated cylinder and bounded surfaces. In order to check this assumption recently published correlation equations...
-
Inhibition of the granular anammox process by the high concentration of free ammonia.
PublikacjaHigh concentrations of ammonia and nitrite, typical for reject water treatment in the anammox process with the use of high temperatures and pH, may cause free ammonia (FA) inhibition. In this study, the inhibitory effect of FA on anammox process rate was investigated in a bench-scale sequencing batch reactor (SBR) with granular anammox biomass. Results of the study present that the anammox process could be successfully operated...
-
Optical fiber aptasensor for label-free bacteria detection in small volumes
PublikacjaHighly sensitive devices for fast bacteria detection are sought to be developed with the task of quantifying the worldwide problem of pathogenic bacteria and thus helping to take control over spreading bacterial infections. This work concerns a sensing solution based on microcavity in-line Mach-Zehnder interferometer (μIMZI) induced in an optical fiber. Such a device exhibits ultrahigh sensitivity to refractive index changes...
-
Propeller Load Modelling In The Calculations Of Marine Shafting Torsional Vibrations
Publikacja -
Simple model of rain wind induced vibrations of stayed cables.
PublikacjaAnalizowano prosty, liniowy model drgań kabli mostów wantowych pod obciążeniem wiatrem i deszczem. Zakłada się, iż częstotliwość ruchu górnej kropli po powierzchni kabla i częstotliwość kabla są równe oraz iż amplituda ruchu kropli dla danej prędkości wiatru są stałe. Otrzymane rezultaty są porównane z istniejącymi w literaturze wynikami badań eksperymentalnych. Podaje się analityczne związki służące do oszacowania tłumienia...
-
Unusual Influence of Fluorinated Anions on the Stretching Vibrations of Liquid Water
PublikacjaInfrared (IR) spectroscopy is a commonly used and invaluable tool in the studies of solvation phenomena in aqueous solutions. Concurrently, ab initio molecular dynamics (AIMD) simulations deliver the solvation shell picture at a molecular detail level and allow for a consistent decomposition of the theoretical IR spectrum into underlying spatial correlations. Here, we demonstrate how the novel spectral decomposition techniques...
-
Positron binding to alkali-metal hydrides: The role of molecular vibrations
PublikacjaThe bound vibrational levels for J=0 have been computed for the series of alkali-metal hydride molecules from LiH to RbH, including NaH and KH. For all four molecules the corresponding potential-energy curves have been obtained for each isolated species and for its positron-bound complex (e+XH). It is found that the calculated positron affinity values strongly depend on the molecular vibrational state for which they are obtained...
-
Diamond investments – Is the market free from multiple price bubbles?
PublikacjaThe following study aims to investigate whether multiple price bubbles, in which the quoted market price of diamonds significantly deviates from their fundamental value, exist in the diamond market. It was conducted using ADF, SADF and GSADF tests, with the latter found to be an optimal form of evaluating the analysed issue. The presented results support the conclusion that the diamond market is not free from periods defined as...
-
Adapt Your Teacher: Improving Knowledge Distillation for Exemplar-free Continual Learning
PublikacjaIn this work, we investigate exemplar-free class incremental learning (CIL) with knowledge distillation (KD) as a regularization strategy, aiming to prevent forgetting. KDbased methods are successfully used in CIL, but they often struggle to regularize the model without access to exemplars of the training data from previous tasks. Our analysis reveals that this issue originates from substantial representation shifts in the teacher...
-
Fluorescence anisotropy decay in the presence of multistep energy migration and back transfer in disordered two-component systems
PublikacjaPrzeprowadzono analizę zaniku anizotropii fluorescencji w sztywnym (lepkim) układzie dwuskładnikowym donor (Rodamina 6G)- akceptor (Rodamina B) z uwzględnieniem prostego i powrotnego transferu energii. Stwierdzono bardzo dobrą zgodność danych doświadczalnych z wynikami symulacji Monte Carlo. W pracy zaprezentowano specjalnie opracowany hybrydowy algorytm symulacji Monte Carlo anizotropii emisji, który jest bardzo wydajny w porównaniu...
-
The decay of quantum correlations between quantum dot spin qubits and the characteristics of its magnetic-field dependence
PublikacjaWe address the question of the role of quantum correlations beyond entanglement in the context of quantum magnetometry. We study the evolution of the rescaled variant of the geometric quantum discord of two electron-spin qubits interacting with an environment of nuclear spins via the hyperfine interaction. We have found that quantum correlations display a strong magnetic-field sensitivity which can be utilized for decoherence-driven...
-
Site-to-site distance distribution in flexible molecules: theoretical evaluation of the donor and/or acceptor fluorescence decay function
PublikacjaPrzedstawiono wyrażenie teoretyczne opisujące zależność funkcji zaniku fluorescencji od rozkładu odległości P(r) pomiędzy donorami i akceptorami w giętkich molekułach dwuchromoforowych. Wyrażenie uwzględnia wiekoeksponencjalny zanik izolowanych donorów i akceptorów, a także możliwość niekompletnego oznakowania molekuł akceptorami. Przyjęto, że względne zmiany odległości donorów i akceptorów w czasie życia fluorescencji donora mogą...
-
Free trade with the former COMECON Countries as Unequal Exchange
PublikacjaTwo authors of this chapter were born to the East of what was once The Iron Curtain and two to the West. From both angles, the two systems – capitalism and communism – seemed to be as contrary to each other as possible. Few people are aware that in terms of industrial and trade policy, both classical capitalism and communism had a common root in the theories of German economist Friedrich List (1789-1846) (List, 1841). In fact,...
-
Free volume in physical absorption of carbon dioxide in ionic liquids: Molecular dynamics supported modeling
PublikacjaUnderstanding the mechanisms underlying the carbon dioxide (CO2) absorption in ionic liquids (ILs) is the key to their efficient utilization in industrial flue gas treatment. One of the parameters considered substantially important in the process is the Free Volume. In this study, the Fractional Free Volume (FFV) of 73 ILs was calculated using Molecular Dynamics (MD). A quantitative Structure-Property Relationship (QSPR) study...