Skocz do pozycji: 1.

Tytuł:

Reduction of nitroaromatic compounds by NAD(P)H:quinone oxidoreductase (NQO1): the role of electron-accepting potency and structural parameters in the substrate specificity

Autorzy:

Misevičienė, Lina
Anusevičius, Žilvinas
Šarlauskas, Jonas
Čėnas, Narimantas

Powiązania:

https://bibliotekanauki.pl/articles/1041217.pdf

Data publikacji:

2006

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

reduction potential
DT-diaphorase
nitroaromatic compounds
reduction mechanism
explosives

Opis:

We aimed to elucidate the role of electronic and structural parameters of nitroaromatic compounds in their two-electron reduction by NAD(P)H:quinone oxidoreductase (NQO1, DT-diaphorase, EC 1.6.99.2). The multiparameter regression analysis shows that the reactivity of nitroaromatic compounds (n = 38) increases with an increase in their single-electron reduction potential and the torsion angle between nitrogroup(s) and the aromatic ring. The binding efficiency of nitroaromatics in the active center of NQO1 exerted a less evident role in their reactivity. The reduction of nitroaromatics is characterized by more positive entropies of activation than the reduction of quinones. This points to a less efficient electronic coupling of nitroaromatics with the reduced isoalloxazine ring of FAD, and may explain their lower reactivity as compared to quinones. Another important but poorly understood factor enhancing the reactivity of nitroaromatics is their ability to bind at the dicumarol/quinone binding site in the active center of NQO1.

Źródło:

Acta Biochimica Polonica; 2006, 53, 3; 569-576
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:

Reduction of vibrations generated by a variable torque in 5-cylinder in-line engines

Autorzy:

Iskra, A.

Powiązania:

https://bibliotekanauki.pl/articles/247235.pdf

Data publikacji:

2011

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

reduction of vibrations

Opis:

Despite undoubted advantages of a 5-cylinder in-line engine, its basic drawback is the lack of partial balancing the torque variability generated by gas forces by means of the torque caused by inertia forces. Such a desired phenomenon occurs in 4-cylinder engines. Accordingly, these engines - within a wide range of rotational speed -demonstrate greater engine smoothness than potentially better 5-cylinder engines. In the article, a concept of generating the moment of inertia forces by means of the proper rollers reducing the amplitude of the moment caused by gas forces is presented. Such a solution will allow for a significant mitigation of vibrations of 5-cylinder engines, and they are in many respects better than 4-cylinder ones, which has been justified more extensively in this article. The paper concerns the opportunity of constructing a 5-cylinder engine of the external torque stability equivalent to the torque stability of a 4-cylinder engine. It will allow obtaining a much better unit from the commonly used present 4-cylinder engines for the drive of passenger cars. An engine of the same swept capacity in the 5-cylinder rather than 4-cylinder version will be characterized by numerous advantages, and first and foremost: the space between the front wheels of the vehicle will be optimally used. 4-cylinder engine generates vary large summary forces of the 2nd order, which is manifested by intensive vibrations in the plane axis of the cylinders.

Źródło:

Journal of KONES; 2011, 18, 4; 137-140
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Effect of Particle Sizes of Slag on Reduction Characteristics of Nickel Slag-Coal Composite Briquette

Autorzy:

Li, Xiaoming
Li, Yi
Xing, Xiangdong
Wang, Yanjun
Wen, Zhenyu
Yang, Haibo

Powiązania:

https://bibliotekanauki.pl/articles/2049420.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

resources reutilization
nickel slag
particle size
direct reduction
reduction characteristics

Opis:

Nickel slag has a high-content iron and is a secondary utilization resource with great development potential. The coal-based direct reduction is an innovative technology that can be used to utilize the iron resources in nickel slag. The effect of the particle size of nickel slag on the strength and the reduction of nickel slag-coal composite briquettes were investigated. Four samples with particle size of 75~106 μm, 106~150 μm, 150~270 μm, and >270 μm were selected. The drop strength increased 9.4 times and the compressive strength reached 281.1 N when the nickel slag particle size decreased from >270 μm to 75~106 μm. The reduction degree determined by the data from the thermogravimetric experiment indicated that its maximum was 79.545%. The reduction experiments performed at 1200°C for 45 minutes indicated that the nickel slag with particle sizes between 75~106 μm were appropriate for the reduction of the nickel slag-coal composite briquettes.

Źródło:

Archives of Metallurgy and Materials; 2021, 66, 1; 127-134
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Asymmetrical PZT Applied to Active Reduction of Asymmetrically Vibrating Beam – Semi-Analytical Solution

Autorzy:

Brański, Adam
Kuras, Romuald

Powiązania:

https://bibliotekanauki.pl/articles/31339957.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

beam
actuator (PZT)
active vibration reduction
vibration reduction coefficient
effectiveness coefficient.

Opis:

The article extended the idea of active vibration reduction of beams with symmetric modes to beams with asymmetric modes. In the case of symmetric modes, the symmetric PZT (s-PZT) was used, and the optimization of the problem led to the location of the s-PZT centre at the point with the greatest beam curvature. In the latter case, the asymmetric modes that occur due to the addition of the point mass cause an asymmetric distribution of the bending moment and transversal displacement of a beam. In this case, the optimal approach to the active vibration reduction requires both new asymmetric PZT (a-PZT) and its new particular distribution on the beam. It has been mathematically determined that the a-PZT asymmetry point (a-point), ought to be placed at the point of maximum beam bending moment. The a-PZT asymmetry was found mathematically by minimizing the amplitude of the vibrations. As a result, it was possible to formulate the criterion of the maximum bending moment of the beam. The numerical calculations confirmed theoretical considerations. So, it was shown that in the case of asymmetric vibrations, the a-PZTs reduced vibrations more efficiently than the s-PZT.

Źródło:

Archives of Acoustics; 2022, 47, 4; 555-564
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:

Simulation of moving loads in elastic multibody systems with parametric model reduction techniques
Zastosowanie techniki parametrycznej redukcji modelu do symulacji ruchomych obciążeń w sprężystym układzie wieloczłonowym

Autorzy:

Fischer, M.
Eberhard, P.

Powiązania:

https://bibliotekanauki.pl/articles/950682.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

multibody systems
model reduction
parametric reduction
odkształcenia sprężyste
model redukcji
metoda parametryczna

Opis:

In elastic multibody systems, one considers large nonlinear rigid body motion and small elastic deformations. In a rising number of applications, e.g. automotive engineering, turning and milling processes, the position of acting forces on the elastic body varies. The necessary model order reduction to enable efficient simulations requires the determination of ansatz functions, which depend on the moving force position. For a large number of possible interaction points, the size of the reduced system would increase drastically in the classical Component Mode Synthesis framework. If many nodes are potentially loaded, or the contact area is not known a-priori and only a small number of nodes is loaded simultaneously, the system is described in this contribution with the parameter-dependent force position. This enables the application of parametric model order reduction methods. Here, two techniques based on matrix interpolation are described which transform individually reduced systems and allow the interpolation of the reduced system matrices to determine reduced systems for any force position. The online-offline decomposition and description of the force distribution onto the reduced elastic body are presented in this contribution. The proposed framework enables the simulation of elastic multibody systems with moving loads efficiently because it solely depends on the size of the reduced system. Results in frequency and time domain for the simulation of a thin-walled cylinder with a moving load illustrate the applicability of the proposed method.
W sprężystym układzie wieloczłonowym rozważane są duże, nieliniowe ruchy ciał sztywnych oraz małe odkształcenia sprężyste. W rosnącej liczbie zastosowań, np. W przemyśle motoryzacyjnym, procesach toczenia i frezowania, pozycja sił działających na ciało sprężyste jest zmienna. Redukcja rzędu modelu, niezbędna by umożliwić efektywną symulację, wymaga wyznaczenia funkcji ansatz, które zależą od zmiennej pozycji sił. Przy wielkiej liczbie możliwych punktów interakcji rozmiar zredukowanego systemu rósłby gwałtownie, gdyby stosować klasyczny schemat syntezy modów składowych (Component Mode Synthesis). Jeśli wiele węzłów jest potencjalnie obciążonych, lub obszar styku nie jest znany a priori, w ujęciu przedstawionym w artykule system opisuje się przy pomocy zależnej od parametru pozycji sił. Umożliwia to zastosowanie metod parametrycznej redukcji rzędu modelu. W artykule opisano dwie techniki oparte na interpolacji macierzowej, które transformują poszczególne systemy zredukowane, umożliwiają interpolację macierzy zredukowanych systemów i pozwalają wyznaczyć systemy zredukowane dla dowolnej pozycji sił. Zaprezentowano dekompozycję w trybie online-offline oraz opis rozkładu sił na zredukowanym ciele sprężystym. Zaproponowany schemat postępowania umożliwia efektywną symulację sprężystych układów wieloczłonowych z ruchomymi obciążeniami, gdyż zależy ona wyłącznie od rozmiaru zredukowanego systemu. Przedstawiono wyniki symulacji w dziedzinie czasu i częstotliwości dla cienkościennego cylindra z ruchomym obciążeniem, które ilustrują możliwości zastosowań proponowanej metody.

Źródło:

Archive of Mechanical Engineering; 2014, LXI, 2; 209-226
0004-0738

Pojawia się w:

Archive of Mechanical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Wpływ modyfikacji zębów na zjawiska dynamiczne w przekładni zębatej w różnych warunkach eksploatacyjnych

Autorzy:

Peruń, G.

Powiązania:

https://bibliotekanauki.pl/articles/196381.pdf

Data publikacji:

2011

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

przekładnia zębata
redukcja drgań
redukcja hałasu
gear
reduction of vibrations
noise reduction

Opis:

Artykuł przedstawia wyniki prac, mających na celu określenie wpływu modyfikacji zarysów zębów na zjawiska dynamiczne, które zachodzą w przekładniach zębatych. Wpływ modyfikacji został określony z wykorzystaniem modelu stanowiska FZG przy uwzględnieniu różnych warunków eksploatacyjnych.

Źródło:

Zeszyty Naukowe. Transport / Politechnika Śląska; 2011, 70; 71-76
0209-3324
2450-1549

Pojawia się w:

Zeszyty Naukowe. Transport / Politechnika Śląska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

PZT Asymmetrical Shape Optimization in Active Vibration Reduction of Triangular Plates

Autorzy:

Brański, Adam
Kuras, Romuald

Powiązania:

https://bibliotekanauki.pl/articles/31339818.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

triangular plate
actuator (PZT)
active vibration reduction
vibration reduction coefficient
effectiveness coefficient

Opis:

The article presents the new 2D asymmetrical PZT (a-PZT) and its effectiveness in the active reduction of triangular plate vibrations. The isosceles right triangular plate with simply supported edges was chosen as the research object. To determine the a-PZT asymmetry and its distribution on the plate, a maximum bending moment criterion for the beam was used. First of all, this criterion points out exact center location of the a-PZT. It was at the point, at which the plate bending moment has reached its maximum value. Next, at this point, it was assumed that the piezoelectric consists of active fibers located radially from the center. Each fiber acted on the plate as a separate actuator. Next, at each direction, the actuator asymmetry was found mathematically by minimizing the amplitude of the vibrations. By connecting the outer edges of individual fibers, the 2D a-PZT was obtained. It was quantitatively confirmed that the effectiveness of the new a-PZT was the best compared with the effectiveness of the standard square and the circular PZTs, adding the same exciting energy to the PZTs.

Źródło:

Archives of Acoustics; 2023, 48, 3; 425-432
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Study the Radiation Time Effect of Synthesis Silver Nanoparticles by Photo Reduction Method

Autorzy:

Abdullah, H. l.
Kadhim, K. J.
Hilal, I. H.

Powiązania:

https://bibliotekanauki.pl/articles/1192092.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

silver nanocolloids
AFM
photo reduction

Opis:

Highly stable dispersion of nanosized silver nanoparticles were prepared by the reduction of silver salt (silver nitrite - AgNO3 ) by photo reduction methods UV-lamps. The irradiation time from 6 min. to one hour effects on the morphology of dispersed silver nanoparticles were studied. The formation of silver nanoparticles characterized by means of ultraviolet-visible spectroscopy, X-ray diffraction spectroscopy and transmission electron microscopy (AFM). During the preparation of observed that the color of dispersion gradually changed from white, yellow, orange, brown finally dark brown by changing with irradiation time, it is also the acidic solutions (PH) have decreased by increasing the duration of irradiation in addition to get different nanoparticles size lies between (33.988-93.175) nm.

Źródło:

World Scientific News; 2016, 37; 220-231
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Application of Social Network Inferred Data to Churn Modeling in Telecoms

Autorzy:

Gruszczyński, W.
Arabas, P.

Powiązania:

https://bibliotekanauki.pl/articles/308695.pdf

Data publikacji:

2016

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

churn reduction
classification
social networks

Opis:

The subject of this work is the use of social network analysis to increase the effectiveness of methods used to predict churn of telephony network subscribers. The social network is created on the basis of operational data (CDR records). The result of the analysis is customer segmentation and additional predictor variables. Proposed hybrid predictor employs set of regression models tuned to specific customer segments. The verification was performed on data obtained from one of the Polish operators.

Źródło:

Journal of Telecommunications and Information Technology; 2016, 2; 77-86
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Influence of normal micro-vibrations in contact on sliding motion of solid body
Wpływ mikrodrgań normalnych w kontakcie na ruch ślizgowy ciała stałego

Autorzy:

Grudziński, K.
Kostek, R.

Powiązania:

https://bibliotekanauki.pl/articles/279625.pdf

Data publikacji:

2005

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

mechanical systems
vibration
friction reduction

Opis:

The paper shows results of some simulation studies on: (i) normal contact micro-vibrations in a simple model of a friction system and (ii) the influence of such vibrations upon reduction of friction forces in the system. A model of friction contact with two degrees of freedom is adopted, considering non-linear normal contact flexibility of rough surfaces acting on each other. The mechanisms which cause the reduction of the friction force are investigated and described. It is proved that the main cause of the decrease of the friction force, if normal contact micro-vibrations are present, is due to certain dynamic processes taking place within the contact region. This decrease is not due to lower values of the friction coefficient, nor lower mean values of the normal reaction and real contact area, as it is often quoted in many publications.
W artykule przedstawiono wyniki symulacyjnych badań mikrodrgań w kierunku normalnym w kontakcie ciał stałych o powierzchniach chropowatych oraz ich wpływu na redukcję siły tarcia. Przyjęto model o dwóch stopniach swobody, uwzględniający nieliniową podatność kontaktową normalną oddziaływujących na siebie powierzchni. Zbadano i opisano mechanizm powodujący zmniejszenie oporu tarcia w kontakcie, w przypadku występowania w nim drgań normalnych. Wykazano, że główną przyczyną redukcji oporu tarcia w takim przypadku są pewne procesy dynamiczne występujące w kontakcie, a nie spadki wartości współczynnika tarcia, ani też średniej wartości reakcji normalnej, jak to się podaje w wielu publikacjach.

Źródło:

Journal of Theoretical and Applied Mechanics; 2005, 43, 1; 37-49
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:

Sound and vibration analysis for 70 m supply vessel in aspect of underwater noise reduction

Autorzy:

Weryk, M.
Kusmirek-Ochrymiuk, M.

Powiązania:

https://bibliotekanauki.pl/articles/331657.pdf

Data publikacji:

2008

Wydawca:

Polskie Towarzystwo Akustyczne

Tematy:

underwater noise reduction
hydroacoustics
vessel

Opis:

The underwater noise and on-board noise measurement analysis, for 70 m supply ship, are presented in the paper, as well as the noise data for main machinery installed on-board. The results were completed by vibration measurements, then comparative analysis and identification of main sources of sound were executed. The main aim for this project was to analyse noise propagation and identify main noise excitation components resulting in underwater noise propagation. Some preliminary proposals of underwater noise reduction are put forward in the paper.

Źródło:

Hydroacoustics; 2008, 11; 431-440
1642-1817

Pojawia się w:

Hydroacoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

A novel method for archiving multibeam sonar data with emphasis on efficient record size reduction and storage

Autorzy:

Moszynski, M.
Chybicki, A.
Kulawiak, M.
Lubniewski, Z.

Powiązania:

https://bibliotekanauki.pl/articles/260572.pdf

Data publikacji:

2013

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

sonar
compression
storage
reduction
efficiency

Opis:

Over the past few years considerable advances in sonar technology, spatial positioning capabilities and computer processing power have lead to significant improvements in mapping, imaging and technologies of seafloor exploration. Recently, modern multibeam echosounder systems (MBES) capable of recording backscatter data for the whole water column, not just for the seabed, have become available thus providing data allowing for visualization and analysis of objects other than the seabed such as single fish, fish schools or pollution. Unlike bathymetric sonars, which only capture the seafloor, multibeam systems produce very large amounts of data during surveys. Because of this, storing the data collected during hydrographic or scientific cruises becomes a crucial problem. In this context, the paper proposes a new approach for efficient reduction and storage of MBES records. The results of a sample implementation of the algorithm being tested on several different sets of MBES data are also discussed.

Źródło:

Polish Maritime Research; 2013, 1; 77-86
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Model of Interactive System for Training in the Proper Use of Hearing Protection Devices

Autorzy:

Górski, P.

Powiązania:

https://bibliotekanauki.pl/articles/176568.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

active noise reduction
hearing protectors

Opis:

In 2011, over 520 thousand persons worked in hazardous conditions (according to the GUS). Among hazardous factors related to working environment noise was found to be the most common one, threatening 199,6 thousand people (52.9% threats-per-persons related to working environment). The prevalence of workplace noise and increasing awareness of effects of its impact on the human body causes increase of the demand for knowledge of the methods of noise reduction. Due to the lack of knowledge concerning the proper use of hearing protectors, effective noise exposure in the real world may be about a dozen dB higher than the declared assumed protection value. For this reason, in Central Institute for Labour Protection – NRI “The interactive system for learning the correct use of hearing protectors” has been developed. The system includes a multimedia guide on hearing protectors supplemented by video tutorials, training materials with training hearing protectors, and software for evaluation of the activities of the trainee.

Źródło:

Archives of Acoustics; 2014, 39, 1; 11-15
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Husserl on the Unconscious and Reduction

Autorzy:

Togni, Alice

Powiązania:

https://bibliotekanauki.pl/articles/2158915.pdf

Data publikacji:

2018

Wydawca:

Projekt Avant

Tematy:

intentionality
phenomenology
psychoanalysis
reduction
unconscious

Opis:

Is there intentionality in the inner most level of the soul? Do we have experience of what is unconscious? And, supposing that such an experience might exist, is it possible to perform reduction on it? In this regard the present paper aims to investigate, from a phenomenological point of view, the process of “raising awareness” of what is unconscious, trying to understand if there is (or if there can be) a connection between this process and the methodological concept of “reduction” developed by Husserl. Particular attention is paid to the specific type of reduction called “psychological reduction,” which, according to Husserl, provides access to the pure soul, the pure field of psychological experience.

Źródło:

Avant; 2018, 9, 2; 75-86
2082-6710

Pojawia się w:

Avant

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Aktywne metody redukcji drgań mechanicznych
Active methods of vibrations reduction

Autorzy:

Konieczny, J.
Kowal, J.

Powiązania:

https://bibliotekanauki.pl/articles/153948.pdf

Data publikacji:

2002

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

redukcja drgań mechanicznych
vibrations reduction

Opis:

W artykule zaprezentowane zostały zasady ogólne i metody rozwiązywania problemu tłumienia drgań mechanicznych. Artykuł stanowi podsumowanie prac prowadzonych przez zespół pracowników Katedry zajmujący się dynamiką i sterowaniem w układach mechanicznych. W artykule tym przedstawiono metodologię projektowania układów aktywnej redukcji drgań, klasę zagadnień, które najlepiej pasuja do proponowanych rozwiązań oraz zasady wzajemnego uzupełniania się biernych i czynnych metod redukcji drgań. Publikacja ta pokazuje również kiedy, gdzie i jak stosować układy aktywnej redukcji drgań przy rozwiązywaniu problemów w praktyce.
The paper presents summary works leading by research works from Department of Process Control who are engaged in the problem of active vibration control. The general principles and methods of active vibration reduction in mechanical systems are in the paper considered.

Źródło:

Pomiary Automatyka Kontrola; 2002, R. 48, nr 12, 12; 5-10
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Active Noise Reduction Algorithm Based on NOTCH Filter and Genetic Algorithm

Autorzy:

Górski, P.
Morzyński, L.

Powiązania:

https://bibliotekanauki.pl/articles/177549.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

active noise reduction
hearing protectors

Opis:

Application of active noise reduction (ANR) systems in hearing protectors requires the use of control algorithms to ensure stability of the ANR system and at the same time highly effective active noise reduction. A control algorithm based on NOTCH filters is an example of solutions that meet these criteria. Their disadvantage is operation over a narrow frequency band and a need for prior determination of frequencies to be reduced. This paper presents a solution of the ANR system for hearing protectors which is controlled with the use of modified NOTCH filters with parameters determined by a genetic algorithm. Application of a genetic algorithm allows to change the NOTCH filter reference signal frequency, and thus, adapt the filter to the reduced signal frequency.

Źródło:

Archives of Acoustics; 2013, 38, 2; 185-190
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 17.

Tytuł:

From experience to gift. Reflections on life as disclosed to consciousness. Part 2

Autorzy:

Szalay, Mátyás

Powiązania:

https://bibliotekanauki.pl/articles/426927.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Papieski Jana Pawła II w Krakowie

Tematy:

life
death
encounter
reduction
donation

Źródło:

Logos i Ethos; 2016, 2(42); 33-54
0867-8308

Pojawia się w:

Logos i Ethos

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Multi-objective optimization problem in the OptD-multi method

Autorzy:

Błaszczak-Bąk, Wioleta
Sobieraj-Żłobińska, Anna
Kowalik, Michał

Powiązania:

https://bibliotekanauki.pl/articles/221473.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

reduction
OptD method
optimization
LiDAR

Opis:

New measurement technologies, e.g. Light Detection And Ranging (LiDAR), generate very large datasets. In many cases, it is reasonable to reduce the number of measuring points, but in such a way that the datasets after reduction satisfy specific optimization criteria. For this purpose the Optimum Dataset (OptD) method proposed in [1] and [2] can be applied. The OptD method with the use of several optimization criteria is called OptD-multi and it gives several acceptable solutions. The paper presents methods of selecting one best solution based on the assumptions of two selected numerical optimization methods: the weighted sum method and the ε-constraint method. The research was carried out on two measurement datasets from Airborne Laser Scanning (ALS) and Mobile Laser Scanning (MLS). The analysis have shown that it is possible to use numerical optimization methods (often used in construction) to obtain the LiDAR data. Both methods gave different results, they are determined by initially adopted assumptions and – in relation to early made findings, these results can be used instead of the original dataset for various studies.

Źródło:

Metrology and Measurement Systems; 2019, 26, 2; 253-266
0860-8229

Pojawia się w:

Metrology and Measurement Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Briquetting of Rosetta ilmenite ore with different organic binder and its reduction in hydrogen in the temperature range of 800-1200 degrees of Celsius
Brykietowanie rudy ilmenitowej z Rosetta przy użyciu różnego organicznego lepiszcza redukowanego w atmosferze wodoru w zakresie temp. 800-1200 stopni Celsjusza

Autorzy:

Abd el-Gawad, H. H.
El-Hussiny, N. A.
Wassf, M. A.
Kalifa, M. G.
Iskander, B. A.
Shalabi, M. E. H.

Powiązania:

https://bibliotekanauki.pl/articles/349661.pdf

Data publikacji:

2009

Wydawca:

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

Tematy:

kinetyka redukcji
brykiety
redukcja w środowisku wodorowym
ilmenite
reduction kinetics
briquetting
reduction by hydrogen

Opis:

Fine grained ilmenite ore was briquetted with different amounts of molasses or pitch and pressed under different values of pressure was studied in this investigation. The results show that optimal amount of added molasses and pitch were 1.5%, the pressure was fixed to 294.3 MPa. Furthermore, the characteristics of raw materials was examined by different methods of analysis, such as x-ray and screen analysis. The produced briquettes were then reduced by different amounts of hydrogen by different temperatures and the reduction kinetics was determined.
Drobno uziarniona ruda ilmenitu, brykietowana z różnymi ilościami melasy lub smoły pod różnym ciśnieniem, była przedmiotem badań w tym artykule. Wyniki wykazały, że optymalną ilością dodawanego lepiszcza było 1,5%, przy ciśnieniu 294,3 MPa. Ponadto, badano różnymi metodami, tj. promienie X oraz analiza sitowa, charakterystyki materiałów. Produkowane brykiety były redukowane przy udziale różnych ilości wodoru przy zmiennych wartościach temperatury. Kinetyka redukcji została określona.

Źródło:

Górnictwo i Geoinżynieria; 2009, 33, 4; 25-40
1732-6702

Pojawia się w:

Górnictwo i Geoinżynieria

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Reduction of Industrial Nickel Oxides with a Hydrogen Bearing Gas Between 523 and 673K

Autorzy:

Plascencia, G.

Powiązania:

https://bibliotekanauki.pl/articles/352276.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

nickel oxides reduction
hydrogen reduction
Avrami-Erofeyev kinetic model
nucleation and growth
activation energy

Opis:

Reduction of three industrial nickel oxides (Goro, Tokyo and Sinter 75) with a hydrogen bearing gas was revisited in the temperature interval from 523 to 673 K (250 to 400°C). A pronounced incubation period is observed in the temperature interval tested. This period decreases as the reduction temperature increases. Thermogravimetric data of these oxides were fitted using the Avrami-Erofeyev kinetic model. The reduction of these oxides is controlled by a nucleation and growth mechanism of metallic nickel over the oxides structure. Rate kinetic constants were re-evaluated and the activation energy for the reduction of these oxides was re-calculated.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 2; 781-789
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Physical and numerical modeling of heat-flow processes in tangentially pulverized fuel-fired boiler

Autorzy:

Barański, J.
Stąsiek, J.
Blasiak, W.

Powiązania:

https://bibliotekanauki.pl/articles/1955747.pdf

Data publikacji:

2003

Wydawca:

Politechnika Gdańska

Tematy:

combustion
experimental modelling
air pollutants reduction

Opis:

The paper presents results of three-dimensional physical modeling and computer simulations of fluid-flow structures, mixing and combustion processes in a 125 MW tangentially fuel-fired boiler and additional fuel - natural gas. This method is commonly called the reburning process, with an emphasis on the reduction of CO, NOx and SOx. The co-firing process is realized between the main coal burners and additional fuel nozzles. To improve the mixing and combustion processes, a physical technique, the so-called acid/alkali technique, is used to optimize the placement and direction of additional air and fuel nozzles. The best result obtained from physical modeling experiments is studied using numerical simulations with the FLUENT commercial code. Numerical modeling results are then used to analyze the performance of an industrial boiler. These results, compared with measurements in a real boiler, seem to be in good agreement with each other.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 3; 347-362
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Nitrogen-doped pyrene as a catalyst for fuel cells

Autorzy:

Chudoba, Anna

Powiązania:

https://bibliotekanauki.pl/articles/1179638.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

DFT
fuel cells
oxygen reduction reaction

Opis:

Density functional theory (DFT) was applied to study nitrogen-doped pyrene as an oxygen reduction reaction (ORR) cathode catalyst for fuel cells. Transition states and energy barriers were calculated to predict the catalytic properties of this substance.

Źródło:

World Scientific News; 2017, 72; 61-68
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Analysis of harmonics reduction methods selection for transformer substation

Autorzy:

Racewicz, Szymon
Rokicki, Mateusz

Powiązania:

https://bibliotekanauki.pl/articles/298173.pdf

Data publikacji:

2020

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

harmonics reduction
active filters
THD coefficient

Opis:

The article presents an investigation of the harmonic level and its possible reduction methods for one of the Michelin factory transformer substation. The substation electrical network consists of two transformers (1.6 MVA and 2.0 MVA) supplying a production line composed of several electrical equipment based on DC and AC motors. In order to investigate the harmonics level and its influence on the substation operation the measurements of the current and the load factor of the powered machines as well as the coefficients THD_u, THD_i, D_u and D_i have been performed using the 3-phase energy quality analyzer Fluke 435II and the network parameter recorder PEL103. Basing on the measurements data the four harmonics reduction methods (passive filters, active filters, 12-pulse rectifier and the Active Front End system) have been proposed and studied. For this purpose the substation electrical network has been modelled using Emerson Harmonics Estymator software. Furthermore, in order to choose the optimal solution the financial analysis of the potential investments has been performed.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2020, 23(1); 5-23
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Methods for risk analysis in disaster reduction

Autorzy:

Van Gelder, P. H. A. J. M.

Powiązania:

https://bibliotekanauki.pl/articles/2069580.pdf

Data publikacji:

2007

Wydawca:

Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności

Tematy:

risk analysis
disaster reduction
natural hazards

Opis:

This paper discusses a proposal for a risk management tool for applications to risk reduction of natural hazards.

Źródło:

Journal of Polish Safety and Reliability Association; 2007, 1; 121--125
2084-5316

Pojawia się w:

Journal of Polish Safety and Reliability Association

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Reduction of chromium(VI) ions from aqueous solutions by using the solvent impregnated resin

Autorzy:

Wójcik, G.
Hubicki, Z.

Powiązania:

https://bibliotekanauki.pl/articles/115625.pdf

Data publikacji:

2011

Wydawca:

Fundacja na Rzecz Młodych Naukowców

Tematy:

sorption of chromium(VI) ions
reduction

Opis:

The solvent impregnated resins enables effective recovery of microquantities of chromium(VI) ions from wastewaters. The solvent impregnated resin (SIR) Amberlite XAD 7 HP as polymer matrix has been prepared by the wet-impregnation technique. Aliquat 336 was employed as the extractant and acetone as the solvents for impregnation. Sorption of chromium(VI) was investigated in the batch process . Sorption of chromium(VI) was studied in the pH range from 1.5 to 7. It was stated that sorption of chromium(VI) ions depends on acidity of solution. The values of recovery factors of chromium(VI) are higher at low pH than in neutral solution. The speciation of chromium was investigated in the studied pH range. Reduction of chromium(VI) to chromium(III) under acidic conditions was observed. Chromium was determined by using the spectrophotometric and atomic absorption spectroscopy methods. Both methods permit to observe changing of valence of chromium(III) and (VI) oxidation states. The prepared SIR is a new sorbent used for recovery of chromium ions from wastewaters.

Źródło:

Challenges of Modern Technology; 2011, 2, 3; 41-43
2082-2863
2353-4419

Pojawia się w:

Challenges of Modern Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Textiles with reduced flammability – an overview

Autorzy:

Szefer, E.

Powiązania:

https://bibliotekanauki.pl/articles/134885.pdf

Data publikacji:

2016

Wydawca:

Tomasz Mariusz Majka

Tematy:

flame retardants
textiles
reduction of flammability

Opis:

Application of flame retardants (FRs) in textiles is crucial to minimize overall fire risk by delaying or suppressing the spread of fire. The use of FRs additives helps to ensure growing demands for reduction of fire hazard caused by highly flammable materials such as textiles and polymers. This paper aims to introduce chemistry and mechanisms as well as review the recent developments in obtaining textiles with reduced flammability (TRF).

Źródło:

Journal of Education and Technical Sciences; 2016, 3, 1; 11-15
2300-7419
2392-036X

Pojawia się w:

Journal of Education and Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

A Galerkin approximation method including space dimensional reduction - applied for solution of a heat conduction equation

Autorzy:

Nakonieczny, K.

Powiązania:

https://bibliotekanauki.pl/articles/118009.pdf

Data publikacji:

2012

Wydawca:

Polskie Towarzystwo Promocji Wiedzy

Tematy:

Galerkin approximation
dimensional reduction
heat conduction

Opis:

A multivariate data fitting procedure, based on the Galerkin minimization method, is studied in this paper. The main idea of the developed approach consists in projecting the set of data points from the original, higher-dimensional space, onto a line section. Then, the approximation problem is solved in the resulting one-dimensional space. The elaborated recipe can be designed so that it is computationally more efficient than the schemes based on the least squares minimization. The performance of the method is studied by comparison with the least squares and the moving least squares procedures in a number of examples, including the solution of the heat diffusion equation.

Źródło:

Applied Computer Science; 2012, 8, 2; 48-58
1895-3735

Pojawia się w:

Applied Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Computational study of the wake control problem

Autorzy:

Protas, B.

Powiązania:

https://bibliotekanauki.pl/articles/279533.pdf

Data publikacji:

1999

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

flow control
drag reduction
vortex method

Opis:

In the paper we are concerned with the problem of flow control. We consider two-dimentional (2D) turbulent wake flows past rotating obstacles where the control objective is to minimize the drag force. Results of numerical simulations are presented which indicate that substantial drag reduction can be obtained using an open-loop algorithm. This finding is compared with available experimental data. In the second part of the paper we derive a rigorous feedback method for optimal flow control.
W pracy badany jest problem sterowania przepływem. Rozważanyjest dwuwymiarowy turbulentny opływ obracającej się przeszkody. Celem sterowania jest minimalizacja siły oporu. Przedstawione wyniki stymulacji numerycznych dowodzą, że istotne efekty można uzyskać przy pomocy algorytmów "otwartych". Fakt ten potwierdzają również dostępne dane eksperymentalne. W drugiej części pracy sformułowany jest algorytm sprzężenia zwrotnego oparty o teorię sterowania optymalnego.

Źródło:

Journal of Theoretical and Applied Mechanics; 1999, 1; 13-27
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Laboratory stand for testing self-powered vibration reduction systems
Stanowisko laboratoryjne do badań samozasilającego się układu redukcji drgań

Autorzy:

Sapiński, B.
Snamina, J.
Jastrzębski, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/281876.pdf

Data publikacji:

2011

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

MR damper
electromagnetic generator
vibration reduction

Opis:

The study describes the laboratory stand for testing semi-active vibration reduction systems comprising a magnetorheological (MR) damper, powered from an electromagnetic generator. The design objectives, mechanical structure and parameters of the test stand are discussed. Dynamic parameters of the stand are estimated basing on numerical simulation data. The key elements of the test stand are presented: the vibration reduction system, the vibration generation system and the data acquisition system. Selected results of functional tests are provided.
W artykule przedstawiono stanowisko badawcze układu redukcji drgań z tłumikiem magnetoreologicznym (MR), który jest zasilany z generatora elektromagnetycznego. Omówiono założenia projektowe i przyjęto strukturę mechaniczną stanowiska oraz wykonano obliczenia jego podstawowych parametrów. Opisano budowę wchodzących w skład stanowiska układów: redukcji drgań, wytwarzania drgań i akwizycji danych pomiarowych. Wykonano obliczenia symulacyjne układu pozwalające na oszacowanie istotnych dla działania stanowiska wielkości mechanicznych i elektrycznych. Przedstawiono wybrane wyniki testów funkcjonalnych stanowiska.

Źródło:

Journal of Theoretical and Applied Mechanics; 2011, 49, 4; 1169-1181
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Procedures and treatments leading to reduction of toxic components emission in diesel engines exhaust gas

Autorzy:

Kalina, P.
Irzycki, A.
Snopkiewicz, K.

Powiązania:

https://bibliotekanauki.pl/articles/248119.pdf

Data publikacji:

2012

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

diesel engine
pollution
reduction of emission

Opis:

The fight against global warming and Earth atmosphere pollution has been for years one of the most important tasks of governments and national economies of the European Union members. Abandonment of efforts leading to reduction mainly of carbon dioxide emission by heavy industry, electric power generation based on coal, passenger aviation and wheeled passenger transport will inevitably be leading to deterioration of health condition of our citizens. This article presents an overview of commonly used structural and technological treatments which have impact on reduction of toxic standardized exhaust pollutants in the surface transport, exemplified on SW 400 engine version of L2 / 3 and its turbocharged version 6CT 107 2/L2. The impact of: engine's adjustment parameters, catalytic afterburners, exhaust gas recirculation, modifications of injectors, turbochargers, supercharging air-cooling and particulates filter on carbon monoxide, hydrocarbons, nitrogen oxides and particulates emission was thoroughly examined. The parameters being compared were the results of toxicity tests according to ECE-R49 Regulation and a maximal smoke values on full-load characteristics. In conclusion, of the paper the limiting allowable values of toxic components emitted in Diesel engines exhaust gases in the following EU Emission Standards are presented.

Źródło:

Journal of KONES; 2012, 19, 1; 163-169
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

A pulse noise detection algorithm using phase scattering

Autorzy:

Kardasz, P.

Powiązania:

https://bibliotekanauki.pl/articles/376739.pdf

Data publikacji:

2017

Wydawca:

Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej

Tematy:

signal processing
audio reconstruction
noise reduction

Opis:

One of the most difficult problems that appears during the process of archival sound restoration is the detection and reduction of the pulse type noise. This kind of noise is the result of contamination or damage to the analog record material. Pulse interference detection algorithms are prone to false positive results. Therefore, to ensure high reliability of the pulse detection process, more than one algorithm should be used and then the results of these algorithms should be analyzed using advanced methods, including intelligent algorithms. The paper presents the pulse detection algorithm based on the phase scattering. Since the Dirac impulse and white noise have the same amplitude part of their spectra, the phase scattering transforms the pulse to the noise. Then a pulse can be detected by comparing the envelope of the original and processed signals. The proposed algorithm has been tested using synthetic test signals as well as a fragment of the archival recording on the damaged record. The directions of further research are outlined.

Źródło:

Poznan University of Technology Academic Journals. Electrical Engineering; 2017, 91; 165-173
1897-0737

Pojawia się w:

Poznan University of Technology Academic Journals. Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Decreasing of the natural background counting - passive and active method

Autorzy:

Kozak, K.
Mietelski, J.
Jasińska, M.
Gaca, P.

Powiązania:

https://bibliotekanauki.pl/articles/148057.pdf

Data publikacji:

2001

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

active shield
background reduction
environmental radioactivity

Opis:

The methods of passive and active shielding and the results of background gamma measurements, during the years 1996-2000 are presented. The spectrometer background was recorded in various shielding configurations. The ultra-low level gamma-spectrometer (called in the paper the spectrometer E), equipped with a veto-detector for cosmic muons (active shield) was under tests during 1999-2000.

Źródło:

Nukleonika; 2001, 46, 4; 165-169
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Asymptotic results for sliced inverse regression
Asymptotyczne rezultaty dla „sliced inverse regression”

Autorzy:

Kötter, Thomas

Powiązania:

https://bibliotekanauki.pl/articles/904627.pdf

Data publikacji:

1997

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

dimension reduction
inverse regression
linear projections

Opis:

It is well known that nonparametric regression techniques do not have good performance in high dimensional regression. However nonparametric regression is successful in one- or low-dimensional regression problems and is much more flexible than the parametric alternative. Hence, for high dimensional regression tasks one would like to reduce the regressor space to a lower dimension and then use nonparametric methods for curve estimation. A possible dimension reduction approach is Sliced Inverse Regression (L i 1991). It allows to find a base of a subspace in the regressor space which still carries important information for the regression. The vectors spanning this subspace are found with a technique similar to Principal Component Analysis and can be judged with the eigenvalues that belong to these vectors. Asymptotic and simulation results for the eigenvalues and vectors are presented.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 1997, 141
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Fenomenologia [„Encyklopedia Brytyjska”: wersja I]
Phenomenology

Autorzy:

Husserl, Edmund
Bekrycht, Tomasz

Powiązania:

https://bibliotekanauki.pl/articles/950182.pdf

Data publikacji:

2015-12-15

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

phenomenology
transcendental philosophy
phenomenological reduction
psychology.

Opis:

This text is the ‘first draft” (erster Entwurf) of Edmund Husserl’s article for the 14th edition of the Encyclopedia Britannica. The text had four versions (A, B, C, D) and it received its final version after many months of work. This ‘first draft’ has a cognitive value as it reflects Husserl’s spontaneous intuitions about understanding of phenomenology and a phenomenological method in the vein of transcendental philosophy, which he has created, developed, improved and on and on modified.

Źródło:

Filozofia Publiczna i Edukacja Demokratyczna; 2015, 4, 2; 102-121
2299-1875

Pojawia się w:

Filozofia Publiczna i Edukacja Demokratyczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Influence of Different Plants Extracts on Silver Nanopar ticles Green Synthesis

Autorzy:

Velgosova, O.
Mražíková, A.
Veselovský, L.
Willner, J.
Fornalczyk, A.

Powiązania:

https://bibliotekanauki.pl/articles/351682.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

nanoparticles
silver
biosynthesis
reduction agents
TEM

Opis:

Three plants extracts were used for biosynthesis of Ag nanoparticles (AgNPs). AgNPs nucleation process requires effective reduction agents which secure Ag⁺ to Ag⁰ reduction and also stabilizing/capping agents. The UV-vis and TEM observation revealed that the best results were obtained by R. officinalis leaf extract. The strong SPR band peak appeared at the wavelength 418 nm. Synthetized AgNPs were globular, fine (~20 nm), uniform and stabile throughout the experiment. A rapid rate of AgNPs synthesis was also significant and economically advantageous factor. Fine (10-20 nm) and globular nanoparticles were synthetized also by U. dioica leaf extract, but the stability of nanoparticles was not permanent. Despite V. vitis-idaea fruit extract contains a lot of reducing agents, UV-vis did not confirm the presence of AgNPs in solution. Synthetized Ag particles were very unstable, Ag particles agglomerated very fast and clearly indicated sediment was formed.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 2; 665-670
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Preparation of Nickel Nanoparticles Using Nickel Raffinate Separated by Solvent Extraction from The Spent FeCl3 Etching Solution

Autorzy:

Park, Il-Jeong
Swain, Basudev
Kim, Dae-Weon
Kim, Geon-Hong
Han, Deok-Hyun
Jung, Hang-Chul

Powiązania:

https://bibliotekanauki.pl/articles/354453.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

nickel
recycling
solvent extraction
chemical reduction

Opis:

FeCl₃ bearing etching solution is mainly used for etching of metals used in shadow masks, PCBs and so on. Due course of Invar alloy etching process the FeCl₃ bearing etching solution get contaminated with Ni²⁺ which affect adversely the etching efficiency. Hence, FeCl₃ bearing etching solution discarded after several cycle of operation causes an environmental and economic problem. To address both the issues the etching solution was purified through solvent extraction and remained Ni²⁺ recovered by wet chemical reduction using hydrazine. For optimum Fe³⁺ extraction efficiency, various extraction parameter were optimized and size and morphology of the recovered pure Ni powder was analyzed. The reported process is a simple process to purify and recover Ni from industry etching solution.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 2; 531-534
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Redukcja zlinearyzowanych modeli podsystemów kotła energetycznego jako obiektu sterowania
Reduction of linearized models of power plant evaporator subsystems as control objects

Autorzy:

Stanisławski, W.
Rydel, M.

Powiązania:

https://bibliotekanauki.pl/articles/153294.pdf

Data publikacji:

2006

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

redukcja
modele hierarchiczne
reduction
hierarchical model

Opis:

Zagadnienia prezentowane w artykule są związane z budową zagregowanych hierarchicznych modeli dynamicznych obiektów sterowania o wielkiej złożoności na przykładzie modelu parownika kotła energetycznego. W szczególności przedstawiono problemy redukcji zlinearyzowanego modelu rur ekranowych parownika kotła energetycznego BP-1150. Poddano analizie problem doboru parametrów filtrów wagowych dla redukcji modelu metodą FW (ang. Frequency Weighted).
The problems connected with reduction of hierarchical models of complex control objects were presented in the article. The paper describes influence of parameters weight function on approximation errors and possibilities of parameters optimization.

Źródło:

Pomiary Automatyka Kontrola; 2006, R. 52, nr 10, 10; 17-18
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Model reduction problem of linear discrete systems: Admissibles initial states

Autorzy:

Abdelhak, A.
Rachik, M.

Powiązania:

https://bibliotekanauki.pl/articles/229165.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

linear discrete systems
model order reduction

Opis:

Given a linear discrete system with initial state x₀ and output function y_i , we investigate a low dimensional linear system that produces, with a tolerance index ϵ, the same output function when the initial state belongs to a specified set, called ϵ-admissible set, that we characterize by a finite number of inequalities. We also give an algorithm which allows us to determine an ϵ-admissible set.

Źródło:

Archives of Control Sciences; 2019, 29, 1; 41-55
1230-2384

Pojawia się w:

Archives of Control Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Husserl’s transcendental phenomenology and the project of science

Autorzy:

Wesolowska, Agnieszka

Powiązania:

https://bibliotekanauki.pl/articles/437547.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie. Instytut Filozofii i Socjologii

Tematy:

philosophy
consciousness
transcendental reduction
subjectivity
cognition

Opis:

The article presents Edmund Husserl’s idea of transcendental phenomenology in the perspective of the project of science. This aspect of Husserl’s writings was pointed out by, for example, Rudolf Bernet, Manfred Brelage, Iso Kern, Eduard Marbach, Eugen Fink, Ludwig Landgrebe, and Roman Ingarden. The main aim, realised in the article is to prove the main hypothesis claiming that transcendental phenomenology is closely connected with Husserl’s conception of philosophy, the idea of philosophy as a science (eidetic and transcendental). The project of transcendental science and knowledge is also connected with Husserl’s conception of transcendental reduction taken as a mode of revealing those constitutive achievements of consciousness which were covered in the natural attitude. In the paper, I focus on presenting the most important points (epistemological, methodological, and transcendental) connected with Husserl’s evolution of phenomenology in the perspective of the project of science.

Źródło:

ARGUMENT: Biannual Philosophical Journal; 2014, 4, 2; 391-404
2083-6635
2084-1043

Pojawia się w:

ARGUMENT: Biannual Philosophical Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Waste management law by example of a small European commune

Autorzy:

Boas Berg, A.
Zloch, J
Radziemska, M.
Adamcová, D.
Vaverková, M. D.

Powiązania:

https://bibliotekanauki.pl/articles/101151.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN

Tematy:

waste reduction activities
law
waste collection

Opis:

The aim of this article was to present the rules governing the waste management system (WMS) and identify the changes emerging as a result of new regulations being introduced by example of Wołomin commune. European, Polish and Czech regulations clearly indicate the value of the hierarchy of waste management (WM). A response to the amended law was the modification of the WMS in communes, including the Wołomin commune. Based on performed analysis and discussions, it can be stated that the municipal waste management system (MWMS) in the commune of Wołomin meets the requirements imposed by the legislator, works efficiently and positively influences the condition of the natural environment. In addition, the information obtained has been generalized and compared with the situation in the Czech Republic (CR).

Źródło:

Infrastruktura i Ekologia Terenów Wiejskich; 2017, IV/1; 1329-1341
1732-5587

Pojawia się w:

Infrastruktura i Ekologia Terenów Wiejskich

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Disability pension granted due to the reduction of prospects for success in the future

Autorzy:

Mularski, Krzysztof
Grzesiowski, Krzysztof

Powiązania:

https://bibliotekanauki.pl/articles/2206891.pdf

Data publikacji:

2023-06-15

Wydawca:

Uczelnia Łazarskiego. Oficyna Wydawnicza

Tematy:

disability pension
reduction
prospects
success
future

Opis:

The aim of this article is to interpret the conditions for, and the content of, a claim for an appropriate disability pension granted due to the reduction of prospects for success in the future (referred to as the third disability pension condition under Article 444 § 2 of the Civil Code). The chosen subject of analysis is primarily justified by the relative lack of attention this disability pension has received in legal literature compared to pensions granted due to other conditions specified in Article 444 § 2 CC. The authors focus on resolving some of the interpretative doubts in the civil law related to the phrase “reduction of the prospects for success in the future”. The derivative conception of legal interpretation serves as the foundation for their analyses. The article posits that a claim for a pension due to the reduction of prospects for success in the future is available to every natural person (including a conceived child) who has suffered a bodily injury or health disorder resulting in a loss of the ability to work (in the broad sense of the term), including the ability to perform household chores and, consequently, the material or financial benefits such work would provide. According to the authors, the provision’s apparent role is to resolve interpretative doubts regarding the pecuniary benefits that the aggrieved party would likely obtain in the future. This likelihood is higher than low or small, but lower than the probability bordering on certainty (or at least very high), which is the usual requirement for lost benefits in order to be granted a disability pension. This result of the interpretation is fully justified in both functional and systemic interpretative directives, as the legislator, to a certain extent, favours the interests of the person who suffered personal injury over those of the entity responsible for the damage.

Źródło:

Ius Novum; 2023, 17, 2 ENG; 86-107
1897-5577

Pojawia się w:

Ius Novum

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Problemy konstruowania modeli hierarchicznych złożonych obiektów sterowania (cz. II)
Hierarchical model construction problems of complex plants (Part II)

Autorzy:

Stanisławski, W.
Rydel, M.

Powiązania:

https://bibliotekanauki.pl/articles/157347.pdf

Data publikacji:

2010

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

redukcja
modele hierarchiczne
reduction
hierarchical model

Opis:

W części drugiej artykułu przedstawiono zagadnienia związane z budową zagregowanych hierarchicznych modeli dynamicznych obiektów sterowania o wielkiej złożoności, na przykładzie modelu parownika kotła energetycznego. W szczególności przedstawiono problemy konstrukcji modelu oraz redukcji zlinearyzowanego modelu parownika kotła energetycznego BP-1150. Zdefiniowano strukturę hierarchicznego modelu parownika oraz przedstawiono modele matematyczne poszczególnych podsystemów parownika. Szczególną uwagę zwrócono na redukcję modeli na poszczególnych poziomach hierarchii z zastosowaniem metody częstotliwościowych funkcji wagowych (ang. Frequency Weighted) z uwzględnieniem określonych zakresów adekwatności modeli. Redukcje modeli przeprowadzono na trzech poziomach: poziom pierwszy - strefa dogrzewu i trzy części strefy odparowania, poziom drugi - rury ekranowe, separator oraz układ cyrkulacji w parowniku, poziom trzeci - parownik.
Problems connected with building of aggregated hierarchical models of complex plants, are presented in the paper. The paper describes problems of linear model building and reduction of a steam boiler BP-1150. The hierarchical structure of a once-through steam boiler was defined, as well as mathematical models of particular parts of the boiler were presented in the paper. Especially, reduction of the models on particular hierarchy levels, using Frequency Weighted method and taking into account adequate ranges of models, were presented in the paper. Models on three levels were reduced: first level - one-phase flow zone and three parts of two-phase flow zone, second level - tubes of evaporator, separator and circulation system in evaporator, third level - evaporator.

Źródło:

Pomiary Automatyka Kontrola; 2010, R. 56, nr 3, 3; 287-291
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Design of fuzzy rule-based classifiers through granulation and consolidation

Autorzy:

Riid, A.
Preden, J.-S.

Powiązania:

https://bibliotekanauki.pl/articles/91638.pdf

Data publikacji:

2017

Wydawca:

Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych

Tematy:

pattern recognition
fuzzy classification
complexity reduction

Opis:

This paper addresses the issue how to strike a good balance between accuracy and compactness in classification systems - still an important question in machine learning and data mining. The fuzzy rule-based classification approach proposed in current paper exploits the method of rule granulation for error reduction and the method of rule consolidation for complexity reduction. The cooperative nature of those methods - the rules are split in a way that makes efficient rule consolidation feasible and rule consolidation itself is capable of further error reduction - is demonstrated in a number of experiments with nine benchmark classification problems. Further complexity reduction, if necessary, is provided by rule compression.

Źródło:

Journal of Artificial Intelligence and Soft Computing Research; 2017, 7, 2; 137-147
2083-2567
2449-6499

Pojawia się w:

Journal of Artificial Intelligence and Soft Computing Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

The influence of holmium on catalytic properties of Fe or Cu-modified vermiculites

Autorzy:

Samojeden, Bogdan
Grzybek, Teresa
Kowal, Joanna
Szymaszek, Agnieszka
Jabłońska, Magdalena
Gläser, Roger
Motak, Monika

Powiązania:

https://bibliotekanauki.pl/articles/109844.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

selective catalytic reduction
deNOx
holmium
vermiculite

Opis:

Natural layered clay, vermiculite, was modified and tested as catalyst for the selective catalytic reduction of NO_x with ammonia (NH₃-SCR). Its modification included the application of the blowing agent (azodicarbonamide), acid treatment and pillaring with Al₂O₃. Active phase (transition metals: Cu or Fe) was introduced via impregnation. The obtained materials were characterized by N₂ sorption (texture), XRD (structure), DR-UV-Vis (oxidation state and aggregation of the active phase), H₂-TPR (reducibility of the active phase), in situ DRIFTS (types of adsorbed species due to contact of the sample NH₃) and NH₃-TPD (type/strength of the acidic sites). The initial modification procedures (treatment with azodicarboamide) resulted in the increase of specific surface area of vermiculite. The introduction of transition metal ions provided a significant amount of acidic sites. The promoting impact of holmium was confirmed by the increased strength of the sites. The highest catalytic activity was exhibited by the sample Fe-containing vermiculite and doped with Ho.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1484-1495
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Long-term Results of Breast Reduction in Female-to-Male Transsexuals

Autorzy:

Antoszewski, Bogusław
Bratoś, Ryszard
Sitek, Aneta
Fijałkowska, Marta

Powiązania:

https://bibliotekanauki.pl/articles/1396621.pdf

Data publikacji:

2012-02-01

Wydawca:

Index Copernicus International

Tematy:

breast reduction
transsexualism female-to-male

Opis:

Transsexualism is considered to be an extreme end in a large group of gender identity disorders. Two main types of transsexualism are identified: male-to-female (MtF) and female-to-male (FtM). Transsexual persons have a feeling of being incarcerated in a foreign body and therefore they wish to change their sex by hormone therapy and surgical treatment. Breast reduction usually is the first procedure in the process of surgical reassignment in FtM transsexual persons.The aim of this study was to evaluate the long-term results of breast reduction in FtM transsexual persons, taking into account breast size and surgical technique. The doctors' and patients' opinions about the results were also compared.Material and methods. The study was carried out in a group of 98 FtM transsexual persons treated at the Department of Plastic, Reconstructive and Aesthetic Surgery. Evaluation of the long-term results of breast reduction was performed based on clinical examination done by the doctors and a questionnaire filled in by the patients and the surgeons.Results. Good results of breast reduction were achieved in more than 60% of the examined patients operated on mainly by Webster technique.Conclusions. Clinical examination of the long-term results of breast reduction in FtM transsexual persons revealed good aesthetic effects. The doctors' and the patients' opinions were similar.

Źródło:

Polish Journal of Surgery; 2012, 84, 3; 144-151
0032-373X
2299-2847

Pojawia się w:

Polish Journal of Surgery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Reduction and Biosorption of Cr(VI) from Aqueous Solutions by Acid- -Modifi ed Guava Seeds: Kinetic and Equilibrium Studies

Autorzy:

Ortíz-Gutiérrez, Marel
Alfaro-Cuevas-Villanueva, Ruth
Martínez-Miranda, Verónica
Hernández-Cristóbal, Orlando
Cortés-Martínez, Raúl

Powiązania:

https://bibliotekanauki.pl/articles/778567.pdf

Data publikacji:

2020

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Guava seeds
chromium reduction
biosorption
isotherms

Opis:

The use of guava seeds (GS) and acid-modified guava seeds (MGS) for the removal of Cr(VI) from aqueous solutions was investigated. Batch-type experiments were performed with Cr(VI) aqueous solutions and biosorbents to determine the kinetic and equilibrium sorption parameters. Results indicated that GS and MGS were capable of reducing and remove Cr(VI) from solutions, but the reduction was only observed at some experimental conditions. Infrared analysis showed that several functional groups were involved in the reduction, and biosorption of Cr(VI), particularly alcohol, phenolic, carboxylic, and methoxymethyl structures. The mechanisms of reduction and biosorption depended upon the type of biosorbent, pH, and temperature of the system. The pseudo-second-order kinetic model describes the kinetic sorption data, and the Langmuir-Freundlich (L-F) model describes the isotherm data in most cases. Significantly high total chromium biosorption capacities were obtained. Acid modification of guava seeds improves chromium biosorption performance.

Źródło:

Polish Journal of Chemical Technology; 2020, 22, 4; 36-47
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Method for efficient distribution of means to reduce CO2 emissions in a set of power plants

Autorzy:

Kałuszko, A.

Powiązania:

https://bibliotekanauki.pl/articles/406407.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

CO2 emissions
reduction
dynamic programming

Opis:

A method for the allocation of technologies of reduction of CO2 emission to sources of emissions based on dynamic programming has been described. The purpose of the application of the method was to develop an efficient strategy of allocating financial means for reducing CO2 emissions from a set of coal and lignite fired power plants (carbon dioxide sources) which enables reduction of the total emissions to the required level within a given time horizon, at the minimum cost. The application of the method is illustrated based on the set of the 20 largest Polish coal and lignite fired power plants.

Źródło:

Operations Research and Decisions; 2013, 23, 2; 55-65
2081-8858
2391-6060

Pojawia się w:

Operations Research and Decisions

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Fast and smooth trajectory planning for a class of linear systems based on parameter and constraint reduction

Autorzy:

Liu, Guangyu
Wu, Shangliang
Zhu, Ling
Wang, Jiajun
Lv, Qiang

Powiązania:

https://bibliotekanauki.pl/articles/2055148.pdf

Data publikacji:

2022

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

constraint reduction
parameter reduction
fast calculation
trajectory planning
redukcja ograniczeń
redukcja parametrów
szybka kalkulacja
planowanie trajektorii

Opis:

Fast and smooth trajectory planning is crucial for modern control systems, e.g., missiles, aircraft, robots and AGVs. However, classical spline based trajectory planning tools introduce redundant constraints and parameters, leading to high costs of computation and complicating fast and smooth execution of trajectory planning tasks. A new tool is proposed that employs truncated power functions to annihilate some constraints and reduce the number of parameters in the optimal model. It enables solving a simplified optimal problem in a shorter time while keeping the trajectory sufficiently smooth. With an engineering background, our case studies show that the proposed method has advantages over other solutions. It is promising in regard to the demanding tasks of trajectory planning.

Źródło:

International Journal of Applied Mathematics and Computer Science; 2022, 32, 1; 11--21
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Refleksje doradców nad własnymi doświadczeniami w streetworkingu
Reflections of counsellors on their own experciences in outreachwork

Autorzy:

Dec-Pietrowska, Joanna

Powiązania:

https://bibliotekanauki.pl/articles/950325.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

streetworking
poradnictwo
filozofia harm reduction
uczenie się przez doświadczenie
outreach/streetworking
counselling
harm reduction
learning through experiencing

Opis:

Artykuł jest prezentacją fragmentu badań doświadczeń zawodowych doradców pracujących jako streetworkerzy. Pomysł na tego rodzaju analizę zrodził się z chęci poznania świata osób zajmujących się pomaganiem osobom marginalizowanym w specyficznych, pozainstytucjonalnych warunkach. Artykuł przybliża czytelnikom refleksje streetworkerów na temat znaczenia, jakie ta praca wywarła na ich postrzeganie siebie, świata innych ludzi, osobistą i zawodową tożsamość. Prezentowany materiał jest elementem szerszych badań nad poradnictwem z wykorzystaniem metody streetworkingu. Ukazane zostały tu wyniki pierwszego ich etapu. Realizowano je strategią jakościową z zastosowaniem wywiadu pogłębionego. Koncepcja streetworkingu jako formy docierania z zewnątrz i pomocy pozainstytucjonalnej oraz koncepcja uczenia się przez doświadczenie były głównymi odniesieniami teoretycznymi prowadzonej analizy. Badani wskazywali, że doświadczenie streetworkingu przyczyniło się nie tylko do zmiany ich pewnych cech osobowościowych, ale pozwoliło im również na wypracowanie nowych lub innych ram definiowania tego, co składa się na pracę doradcy, co jest w niej istotne i potrzebne.
The article presents a fragment of research on experiences of professional counsellors working as outreachworkers. The idea of this analysis came from the desire to explore the world of people who professionally help marginalised people, in specific non-institutional conditions. The paper introduces outreachworkers’ reflections on the meaning and importance their work had on their own self-perception, perceiving others and their personal and professional identity. The material presented here is the element of the wider research on counselling with the use of outreach method. The first stage findings are shown here. Qualitative strategies were applied in the research with the use of in-depth interview. The concept of outreach and streetworking as a form of reaching people out and non-institutional help as well as the concept of learning through experiencing were the main theoretical perspective of the analysis. The respondents indicated that the experience of streetworking has contributed not only to changing their personality traits, but also has enabled them to develop new or different frameworks of defining what constitutes a counsellor’s work, what is important and needed in it.

Źródło:

Dyskursy Młodych Andragogów; 2018, 19; 237-253
2084-2740

Pojawia się w:

Dyskursy Młodych Andragogów

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

FFT-based simulation using a reduced set of frequencies adapted to the underlying microstructure

Autorzy:

Gierden, Christian
Waimann, Johanna
Svendsen, Bob
Reese, Stefanie

Powiązania:

https://bibliotekanauki.pl/articles/29520101.pdf

Data publikacji:

2021

Wydawca:

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

Tematy:

microstructure simulation
FFT
model order reduction
composites

Opis:

Instead of the classical finite element (FE) based microstructure simulation, a Fast Fourier transform (FFT) based microstructure simulation, introduced by Moulinec and Suquet (1994, 1998), also enables the computation of highly resolved microstructural fields. In this context, the microscopic boundary value problem is captured by the Lippmann-Schwinger equation and solved by using Fast Fourier transforms (FFT) and fixed-point iterations. To decrease the computational effort of the fixed-point solver, Kochmann et al. (2019) introduced a model order reduction (MOR) technique based on solving the Lippmann-Schwinger equation in Fourier space with a reduced set of frequencies. Thereby, the accuracy of this MOR technique depends on the number of used frequencies and the choice of frequencies that are considered within the simulation. Instead of the earlier proposed fixed (Kochmann et al., 2019) or geometrically adapted (Gierden et al., 2021b) sampling patterns, we propose a sampling pattern which is updated after each load step based on the current strain. To show the precision of such a strain-based sampling pattern, an elasto-plastic two-phase composite microstructure is investigated.

Źródło:

Computer Methods in Materials Science; 2021, 21, 1; 51-58
2720-4081
2720-3948

Pojawia się w:

Computer Methods in Materials Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Effectiveness of friction force reduction in sliding motion depending on the frequency of longitudinal tangential vibrations, sliding velocity and normal pressure

Autorzy:

Leus, Mariusz
Gutowski, Paweł
Rybkiewicz, Marta

Powiązania:

https://bibliotekanauki.pl/articles/27314317.pdf

Data publikacji:

2023

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

reduction of friction force
vibrations
experimental verification

Opis:

The article presents the results of experimental research and simulation analyses of the influence of slip velocity, normal pressures and vibration frequency on the effectiveness of friction force reduction carried out in sliding motion in the presence of forced tangential vibrations. In experimental studies, changes in the driving force were measured during the slip of the upper body over the vibrating lower body. The direction of these vibrations was parallel both to the contact plane and to the direction of movement of the shifted body. The simulation tests were carried out in the Matlab/Simulink environment through the use of numerical procedures that were specially created for this purpose. Dynamic friction models considering the tangential compliance of contact and the phenomenon of pre-sliding displacement were used for calculations. The paper presents the designated values of the so-called coefficient of average friction force reduction in sliding motion for the following friction pairs: steel C45–steel C45, steel C45–cast iron GGG40 and steel C45–polytetrafluoroethy-lene PTFE (Teflon). The results of numerical analyses were in good agreement with those of experimental tests. A significant dependence of the level of average friction force reduction on the frequency of forced vibrations, sliding velocity as well as the kind of sliding pair material, and normal pressures was shown.

Źródło:

Acta Mechanica et Automatica; 2023, 17, 4; 490--498
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Investigation of structural, optical and antibacterial effect of copper nanoparticles synthesis by photoreduction

Autorzy:

Hilal, Zahraa Hadi
Wahab, Farah Lateef
Hila, Israa Hadi

Powiązania:

https://bibliotekanauki.pl/articles/1191426.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Nanocopper
photo reduction
optical properties
Antibacterial effect

Opis:

The copper nanoparticles films has been prepared via the reduction of copper salts CuSO4•5H2O by UV-lamps. The irradiation time changed from 15 min. to one hour effects on the morphology of dispersed copper nanoparticles were studied. The structure properties of the films were determined by X-ray diffraction, the change on the surface morphology was observed using atomic force microscope (AFM). Finally, The optical transmission of thin films was measured by UV-VIS spectrometer, during the preparation of observed that the color of dispersion gradually changed from blue coloration, brown finally dark brown by changing with irradiation time .As well as studies the biochemical and antibacterial effect of nano colloid studying by using Pseudomonas aeruginosa, Bacillus subtitis, Escherichia coli and Klebsiella phenmoniae. The copper nanoparticles is increasing its antibacterial activities. Actions of copper nanoparticles synthesized in both above method was also observed against both gram (-) and gram (+) bacteria.

Źródło:

World Scientific News; 2016, 40; 1-11
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Measuring wind gradients in agroforestry systems by shaded piche evaporimeters. II. Accuracies obtained in some African case studies

Autorzy:

Stigter, C J
Kainkwa, R.M.R.
Oteng'i, S.B.B.
Onyewotu, L.O.Z.
Mohammed, A.E.
Ibrahim, A.A.
Rashidi, M.G.M.

Powiązania:

https://bibliotekanauki.pl/articles/26193.pdf

Data publikacji:

2000

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

anemometry
Piche evaporimeter
wind reduction
agroforest system

Źródło:

International Agrophysics; 2000, 14, 4
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

Methods of reduction of tick population in the environment

Autorzy:

Gliniewicz, A.
Krolasik, A.
Mikulak, E.
Przygodzka, M.

Powiązania:

https://bibliotekanauki.pl/articles/6042.pdf

Data publikacji:

2016

Wydawca:

Polskie Towarzystwo Parazytologiczne

Tematy:

population reduction
tick
animal population
natural environment

Źródło:

Annals of Parasitology; 2016, 62, Suppl.
0043-5163

Pojawia się w:

Annals of Parasitology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Optimal positions of tunable translational and rotational dynamic absorbers in global vibration control in beams

Autorzy:

Łatas, W.

Powiązania:

https://bibliotekanauki.pl/articles/279393.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

dynamic vibration absorber
beam vibration
vibration reduction

Opis:

The paper discusses the problem of vibration of an Euler-Bernoulli beam with translational and rotational dynamic absorbers attached. The beam is subjected to concentrated and distributed harmonic forces. The equation of motion is solved using the Fourier method. The time Laplace transformation allows one to determine the amplitude-frequency characteristics of the beam deflection. The aim of the study is to examine the influence of positions of the translational and rotational dynamic absorbers on vibration suppression in the global control problem in beams. Numerical examples present reduction of kinetic energy of the cantilever beam with tunable absorbers over a wide range of frequencies. Optimal positions of the absorbers are obtained.

Źródło:

Journal of Theoretical and Applied Mechanics; 2015, 53, 2; 467-476
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Study operation of the active suspension system of a heavy machine cab
Analiza pracy aktywnego zawieszenia kabiny maszyny roboczej

Autorzy:

Tora, G.

Powiązania:

https://bibliotekanauki.pl/articles/279997.pdf

Data publikacji:

2010

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

active vibration reduction
cab suspension
platform mechanism

Opis:

This study is a part of research on active suspension systems of cabs in heavymachines and trucks, used for suppressing low-frequency and large- amplitude vibrations. The suspension system incorporates two platform mechanisms placed one upon the other. The lower mechanism is responsible for maintaining the cab in the vertical position whilst the upper mechanism controls the cab movements in the vertical direction. Motion of the cab is described using versors associated with the mechanism links. Relationships are derived that yield the instantaneous velocities of the drives that lead to reduction of the cab vibrations in selected DOFs. The procedure is shown for calculating the loads acting on the drives of the active suspension during the specified movement of the machine frame. The mathematical model is further utilised in simulations of the suspension operation.
Artykuł stanowi etap prac dotyczących aktywnego zawieszenia kabiny maszyny roboczej, służącego do redukcji drgań niskoczęstotliwościowych o dużej amplitudzie. Zawieszenie składa się z dwóch mechanizmów platformowych umieszczonych jeden na drugim. Dolny mechanizm jest odpowiedzialny za utrzymanie kabiny w pionie. Górny mechanizm odpowiada za ruch kabiny w kierunku pionowym. Do opisu ruchu wykorzystano wersory związane z ogniwami mechanizmu. Wyprowadzono zależności na chwilowe prędkości napędów, powodujących redukcję drgań kabiny maszyny w wybranych stopniach swobody. Przedstawiono sposób obliczania obciążeń napędów aktywnego zawieszenia kabiny dla znanego ruchu ramy maszyny. Na podstawie matematycznego modelu wykonano symulacje pracy zawieszenia.

Źródło:

Journal of Theoretical and Applied Mechanics; 2010, 48, 3; 715-731
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Optimization as a tool for time reduction in simulation projects

Autorzy:

Gregor, M.
Stefanik, A.

Powiązania:

https://bibliotekanauki.pl/articles/117744.pdf

Data publikacji:

2006

Wydawca:

Polskie Towarzystwo Promocji Wiedzy

Tematy:

simulation
optimization
time reduction
optimization algorithms
application

Opis:

This paper presents the optimization methods appropriate for discrete event simulations of manufacturing systems. The chosen optimization approach was applied in various simulation projects. Given example shows practically how can be utilize optimization in simulation. The paper presents the results of simulation and time reductions achieved through optimisation.

Źródło:

Applied Computer Science; 2006, 2, 1; 135-147
1895-3735

Pojawia się w:

Applied Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

Determinants of the experts evaluation of journals in economic sciences

Autorzy:

Osiewalski, Jacek
Osiewalska, Anna

Powiązania:

https://bibliotekanauki.pl/articles/703006.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

scientometrics
multiple regression statistical model
model reduction

Opis:

In 2015 an important part of the official evaluation of Polish scientific journals was left to experts’ judgement. In this paper we try to establish which observable factors (with available data) are closely related to the outcome of experts’ evaluation of Polish journals in economic sciences. Using the multiple regression statistical model we show that only 5 variables (out of 17) significantly explain almost 50% of the empirical variance of the experts’ evaluation. The determinants of particular interest, not entering the formal criteria and not related to the impact on global science, are: the number of citations mainly in Polish journals and the affiliation with the Polish Academy of Sciences.

Źródło:

Nauka; 2017, 1
1231-8515

Pojawia się w:

Nauka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Numerical Modeling of Copper Reduction in Fire Refining Process

Autorzy:

Kolczyk, E.
Miczkowski, Z.
Czernecki, J.

Powiązania:

https://bibliotekanauki.pl/articles/354138.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

numerical modelling
copper reduction
anode furnace
tuyere

Opis:

Copper reduction represents one of the steps in the process of fire refining of blister copper. Process of copper reduction with natural gas as performed in the anode furnace was modeled. Numerical analysis was conducted using the IPSA (Inter- Phase-Slip Algorithm) module of PHOENICS package and standard turbulent model k - ε. The model takes into account the liquid phase - slag and phase of natural gas which is supplied through the tuyere from the bottom of the charge. Calculations were made for two different diameters of tuyeres for supply of reducer. Based on the calculations and analysis, it was found out that the gas flow which causes strong movement in the bath guarantees homogeneous composition of the liquid copper in each process stage. Application of a tuyere with a larger diameter results in a greater intensity of the reduction process and better use of the reducer.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2A; 521-528
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Recovery of Pig Iron from Copper Smelting Slag by Reduction Smelting

Autorzy:

Erdenebold, U.
Choi, M.-H.
Wang, J.-P.

Powiązania:

https://bibliotekanauki.pl/articles/355067.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

copper slag
reduction
pig iron
fayalite
recovery

Opis:

Copper slag is a by-product obtained during smelting and refining of copper. Copper smelting slag typically contains about 1 wt.% copper and 40 wt.% iron depending upon the initial ore quality and the furnace type. Main components of copper slag are iron oxide and silica. These exist in copper slag mainly in the form of fayalite (2FeO ·SiO₂ ). This study was intended to recover pig iron from the copper smelting slag by reduction smelting method. At the reaction temperature of below 1400°С the whole copper smelting slag was not smelted, and some agglomerated, showing a mass in a sponge form. The recovery behavior of pig iron from copper smelting slag increases with increasing smelting temperature and duration. The recovery rate of pig iron varied greatly depending on the reaction temperature.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 4; 1793-1798
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Numerical Evaluation of the Vibration Reduction Index for Structural Joints

Autorzy:

Ramis, J.
Segovia, E.
Alba, J.
Carbajo, J.
Godinho, L.

Powiązania:

https://bibliotekanauki.pl/articles/177736.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

finite element model
vibration reduction
structural joints

Opis:

The present paper addresses the analysis of structural vibration transmission in the presence of struc- tural joints. The problem is tackled from a numerical point of view, analyzing some scenarios by using finite element models. The numerical results obtained making use of this process are then compared with those evaluated using the EN 12354 standard vibration reduction index concept. It is shown that, even for the simplest cases, the behavior of a structural joint is complex and evidences the frequency dependence. Comparison with results obtained by empirical formulas reveals that those of the standards cannot accurately reproduce the expected behavior, and thus indicate that alternative complementary calculation procedures are required. A simple methodology to estimate the difference between numerical and standard predictions is here proposed allowing the calculation of an adaptation term that makes both approaches converge. This term was found to be solution-dependent, and thus should be evaluated for each structure.

Źródło:

Archives of Acoustics; 2012, 37, 2; 189-197
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Thermodynamics and Kinetics Analysis on Carbothermic Reduction of Calcined Magnesite in Vacuum

Autorzy:

Tang, Qifeng
Ao, Jinqing
Peng, Biyou
Guo, Biao
Yang, Tao

Powiązania:

https://bibliotekanauki.pl/articles/2125546.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

calcined magnesite
carbothermic reduction
vacuum
thermodynamics
kinetics

Opis:

The carbothermic reduction of calcined magnesite in vacuum was studied. By thermodynamic analysis, the starting temperature of reduction reaction dropped from 2173K to 1523K when system pressure dropped from 1 atmosphere to 100 Pa. The experiments were carried out at different conditions under 10~100 Pa and the experimental results shown that the reduction extent of MgO improved by increasing the reaction temperature and time, the pellet forming pressure as well as adding fluoride as catalyst. The rate-determining step of carbothermic reduction process was gas diffusion with the apparent activation energy of 241.19~278.56 kJ/mol.

Źródło:

Archives of Metallurgy and Materials; 2022, 67, 3; 1021--1026
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Nitrogen-doped Carbon Catalyst by Ultrasonic for Electrocatalytic CO2 Reduction

Autorzy:

Liu, Jianfeng
Wang, Ting
Zhang, Zhenhai
Ning, Kai
Yin, Shibin
Yuan, Binxia

Powiązania:

https://bibliotekanauki.pl/articles/780079.pdf

Data publikacji:

2020

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Nitrogen-doped
Catalyst
Ultrasonic
CO2 Reduction

Opis:

The electrocatalytic reduction of carbon dioxide into valued chemicals such as formic acid has the most promising potential in applying renewable energy for useful materials and mitigating the greenhouse effect. However, the studies still focus on developing catalysts with low price and high catalytic properties. In this study, nitrogen atoms were decorated into carbon structure by a unique ultrasonic method, then the nitrogen-doped carbon material was applied as catalyst in CO₂ reduction, it exhibited excellent electrochemical activity, 4 times higher than the normal method. The improved activity should be attributed to the interaction between nitrogen and carbon atoms through analysis.

Źródło:

Polish Journal of Chemical Technology; 2020, 22, 3; 24-28
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Development of an Engineer Operation Aimed at the Reduction of Atmospheric Dust Pollution in the Decommissioning of Iron-Ore Treatment Waste

Autorzy:

Suprun, Igor
Kuznetsov, Vladimir S.
Ivanov, Andrey V.

Powiązania:

https://bibliotekanauki.pl/articles/123979.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

reduction
dust pollution
decommissioning
iron-ore waste

Opis:

This work covers the pollution of the atmosphere during the work of the Mikhailovsky Mining and Refining Facility which is located within 100 km from the city of Kursk, in the city of Zheleznogorsk. Over the past few years in the whole world, the anthropogenic activity, connected mainly with the locations of mineral production and those of mineral treatment and processing, has become increasingly dangerous for the natural environment. Resource development in open pits causes the formation of inorganic dust. The dust is released into the atmosphere at all stages of the enterprise’s technical process. The principal sources generating inorganic dust during open mining of iron deposits include: blasting operations in an open pit, the work of transfer points, the enrichment process at a factory, pellet firing as well as dusting from the surfaces of stock dumps and dry tailings beaches.

Źródło:

Journal of Ecological Engineering; 2019, 20, 4; 23-28
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Pressure drops during the flow of solutions of cocamidopropyl betaine and cocamide DEA mixtures with the addition of ethylene glycol

Autorzy:

Różańska, Sylwia
Różański, Jacek
Wagner, Patrycja
Warmbier, Ewelina

Powiązania:

https://bibliotekanauki.pl/articles/2174827.pdf

Data publikacji:

2022

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

drug reduction
pressure drop
rheology
surfactants solutions

Opis:

The paper presents the results of experimental studies on pressure drops during the flow of cocamidopropyl betaine (CAPB) and DEA cocamide solutions with the addition of ethylene glycol. The degree of drag reduction during the flow of the CAPB/DEA aqueous solution and with the 10% addition of ethylene glycol was similar. A significant reduction in pressure drops was also observed at the 20% concentration of ethylene glycol. However, the increase in the concentration of ethylene glycol resulted in the reduction of flow resistance at higher temperatures. The resistance of the micellar microstructure of CAPB/DEA solutions to mechanical degradation depends strongly on the pH level. Significant changes in flow properties were observed when the initial pH was alkaline. The solution with initial pH close to neutral was stable over time, though reduced resistance to degradation with time was also observed.

Źródło:

Polish Journal of Chemical Technology; 2022, 24, 4; 67--71
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

A Study on the Recovery of Zinc and Pig Iron from Byproducts after Steelmaking Dust Treatment

Autorzy:

Wang, Jei-Pl

Powiązania:

https://bibliotekanauki.pl/articles/2203737.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

steelmaking dust
reduction
recovery
zinc
pig iron

Opis:

In this study, a research was conducted to recover metallic zinc and pig iron and to improve the purity and the recovery rate through a reduction process for zinc and iron in the byproducts that are generated after steelmaking dust treatment. As the result of the calcination, it was confirmed that Cl (6.06%) and K (3.37%) decreased to Cl (2.75%) and K (0.22%), respectively. For the zinc powder that was recovered with reaction temperature of 1100°C, reaction time of 4 hours, and argon gas of 1L/min as the optimal conditions. The measurement for the purity of zinc was 99.8% and the recovery rate was 92.14%. The melt reduction for recovering pig iron from the residue was reacted under reaction temperature of 1600°C, flux composition (CaO:SiO2) of 1:1, and reducing agent infusion ratio (residue: C) of 14:1, and the pig iron was measured to have a purity of 87.7% and a recovery rate of 91.81%.

Źródło:

Archives of Metallurgy and Materials; 2023, 68, 1; 205--208
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Univalent iron monoazaetioporphyrin complexes studied by Mössbauer spectroscopy

Autorzy:

Kaczmarzyk, T.
Dziliński, K.
Sinyakov, G.
Egorova, G.

Powiązania:

https://bibliotekanauki.pl/articles/148854.pdf

Data publikacji:

2003

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

EPR
iron porphyrins
Mössbauer spectroscopy
reduction reactions

Opis:

Results of Mössbauer and EPR studies of univalent-iron monoazaetioporphyrin complexes [Fe(I)(MAEP)] are presented in this paper. Fe(I)(MAEP) were generated using the chemical reduction method. Three forms of the univalent-iron monoazaetioporphyrin complexes were observed: (I) typical Fe(I)(MAEP), (II) with an additional electron on the porphyrin ligand [Fe(I)(MAEP•)]- and (III) the Fe(I)(MAEPh) phlorin structure. Electron configuration of Fe(I) ions in these complexes is (dxy)2(dxz ,dyz)4(dz 2)1. The [Fe(I)(MAEP•)]- structure is stable only in solution and it is transferred into Fe(I)(MAEP) in the solid state. Mössbauer parameters for all products of the reduction reaction are given.

Źródło:

Nukleonika; 2003, 48,suppl.1; 31-34
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

The influence of effectiye strain on the reduce roughness and strain hardening surface layer ship machine elements

Autorzy:

Dyl, T.

Powiązania:

https://bibliotekanauki.pl/articles/243929.pdf

Data publikacji:

2010

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

burnishing
strain hardening
surface roughness reduction ratio

Opis:

Processes of the burnishing can be used to production and regeneration of many elements of par t of shipping machines. The cylindrical external surfaces be regenerated often (the Journal of drive shaft and crankshaft). The burnishing is the cold plastic working; it marks with cleanness and the speed of process as well as the possibility of easy applying in practice. Across she pressing it can be applied to processing of cylindrical external surfaces processing and internal, flat and about different shapes. Examinations have been carried out for C45 steel with the use of fixed load furnisher NK-01 constructed in Department of Marine Materials and Technology. The research results have been presented in the paper and served as a basis for defining which parameters and values have greatest influence on the obtained hardness of the burnished surface. Finally conclusions related to the influence of burnishing on surface layer strengthening of a treated material have been drawn taking into account the results obtained in the research. The influence of effective strain on stereometrical properties and strain hardening at the surface layer of steel C45 after surface plastic working (burnishing) is presented. Characteristic features ofburnishing technology are a lack of thermal phenomena, simplicity of use and low-cost application. Burnishing is a technology used for the production and regeneration of parts of marine machinery, for example, can be used in the manufacture or repair of shafts and crankshafts as finishing. These papers present the influence of technological parameters of burnishing on strain hardening and surface roughness reduction ratio of ship machine elements surface layer.

Źródło:

Journal of KONES; 2010, 17, 3; 75-78
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Prevalence of Depressive Symptoms among Young Adults in Szczecin

Autorzy:

Stępień-Słodkowska, Marta
Kostkiewicz, Hanna
Kotarska, Katarzyna
Kawicka, Bożena

Powiązania:

https://bibliotekanauki.pl/articles/1030614.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego

Tematy:

Beck Depression Inventory
depression
mood reduction
students

Opis:

Depressive disorders have become one of the greatest health problems of the modern society, with about 350 million people suffering from depression around the world (WHO). The aim of this study was to determine the prevalence of symptoms of depressed mood and symptoms indicating the possibility of depression or its progression among young people living in the city of Szczecin, Poland. Data from 150 students (107 women and 43 men) from one of the local universities constituted the material for this anonymous study which was based on the Beck Depression Inventory – 21 questions assessing the severity of depressive symptoms. Our results showed that 78% of women and 89% of men did not show symptoms of depression (Fig. 1). The incidence of mild depressive episodes was revealed in 15% of women and 7% of men, moderate episodes in 3% of women and 2% of men, and severe depression in 4% of women and 2% of men.

Źródło:

Central European Journal of Sport Sciences and Medicine; 2019, 25, 1; 15-21
2300-9705
2353-2807

Pojawia się w:

Central European Journal of Sport Sciences and Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Cost management with budgeting and Kaizen Costing

Autorzy:

Olszewska, Kinga

Powiązania:

https://bibliotekanauki.pl/articles/1062764.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Kaizen Costing
Kaizen philosophy
budgeting
cost reduction

Opis:

Business units must constantly adapt to changing market conditions and consumer expectations. Introducing changes aimed at increasing the adaptability of an enterprise is often associated with high costs or radical changes in the structure of the company and the way it operates. This article discusses the budgeting and Kaizen philosophy and their impact on the management of the enterprise's cost area. Based on the case study, it was presented how the use of the budgeting procedure and Kaizen Costing can affect the unit's cost management process. The use of Kaizen in the area of enterprise cost management was also discussed. The aim of the article is to show how the decision to use budgeting and Kaizen in the area of costs can translate into the company's financial results and its overall functioning.

Źródło:

World Scientific News; 2019, 133; 171-190
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

Reduction Kinetics Behavior of FeO-CaO-SiO2-MgO-Al2O3 Molten Slag Using Solid-Carbon

Autorzy:

Gao, Q.
Shen, Y.
Wei, G.
Shen, F.

Powiązania:

https://bibliotekanauki.pl/articles/353876.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

kinetics
molten slag
reduction
blast furnace
carbon

Opis:

Reduction of FeO-bearing molten slag using solid-carbon, existing in primary slag of blast furnace (BF), consumes much BF energy. It is also a limit for BF efficiency. In this paper, reduction kinetics behavior of FeO-CaO-SiO₂-MgO-Al₂O₃ molten slag (primary slag of BF) was investigated, and the restrictive step of the reaction was identified. It has been found that the reduction process of FeO-CaO-SiO₂-MgO-Al₂O₃ BF slag using solid-carbon is a second-order reaction. And the reduction process is controlled by both diffusion of FeO and gasification reaction of carbon in molten slag. The apparent activation energy of reaction is 342.37 kJ/mol, the diffusion activation energy of FeO in molten slag is 355 kJ/mol, and the gasification reaction activation energy of carbon is 152.98 kJ/mol. Additionally, it is also concluded that reduction rate is influenced by temperature (T), mass fraction of FeO (w_(FeO)), and basicity (R) of the slag. Moreover, a reduction model of this slag system was established and verified by a series of experiments.

Źródło:

Archives of Metallurgy and Materials; 2018, 63, 1; 257-263
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

Intrinsic dimensionality detection criterion based on Locally Linear Embedding

Autorzy:

Meng, L.
Breitkopf, P.

Powiązania:

https://bibliotekanauki.pl/articles/952945.pdf

Data publikacji:

2018

Wydawca:

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

Tematy:

LLE
dimensionality reduction
intrinsic dimensionality
neighborhood
preserving

Opis:

In this work, we revisit the Locally Linear Embedding (LLE) algorithm that is widely employed in dimensionality reduction. With a particular interest to the correspondences of the nearest neighbors in the original and embedded spaces, we observe that, when prescribing low-dimensional embedding spaces, LLE remains merely a weight-preserving rather than a neighborhood-preserving algorithm. Thus, we propose a \neighborhood-preserving ratio" criterion to estimate the minimal intrinsic dimensionality required for neighborhood preservation. We validate its efficiency on sets of synthetic data, including S-curve, Swiss roll, and a dataset of grayscale images.

Źródło:

Computer Science; 2018, 19 (3); 345-356
1508-2806
2300-7036

Pojawia się w:

Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

Efficient multi-classifier wrapper feature-selection model. Application for dimension reduction in credit scoring

Autorzy:

Bouaguel, Waad

Powiązania:

https://bibliotekanauki.pl/articles/27312845.pdf

Data publikacji:

2022

Wydawca:

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

Tematy:

multi-classifier
heuristic
dimensionality reduction
credit scoring

Opis:

The task of identifying the most relevant features for a credit-scoring application is a challenging task. Reducing the number of redundant and unwanted features is an inevitable task for improving the performance of a credit-scoring model. The wrapper approach is usually used in credit-scoring applications to identify the most relevant features. However, this approach suffers from the issue of subset generation and the use of a single classifier as an evaluation function. The problem here is that each classifier may give different results that can be interpreted differently. Hence, we propose an ensemble wrapper featureselection model in this study that is based on a multi-classifier combination. In the first stage, we address the problem of subset generation by minimizing the search space through a customized heuristic. Then, a multi-classifier wrapper evaluation is applied using two-classifier-arrangement approaches in order to select a set of mutually approved sets of relevant features. The proposed method was evaluated on four credit datasets and has shown good performance as compared to individual classifier results.

Źródło:

Computer Science; 2022, 23 (1); 133--155
1508-2806
2300-7036

Pojawia się w:

Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

Selected Aspects of the Assessment of the Quality of Slag

Autorzy:

Bydałek, A. W.
Holtzer, M.

Powiązania:

https://bibliotekanauki.pl/articles/382633.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

slag quality
slag reduction
reduction capability
environment
environmental impact assessment
żużel
redukcja żużla
środowisko
ocena oddziaływania na środowisko

Opis:

Two approaches have been proposed to analyze the quality of the slag: metallurgical evaluation of and environmental impact assessment. The analysis of the metallurgical quality of the slag using the DTA methods was carried. In the paper a method of determining the reduction capability of slag solutions was used. There are the oxides complexes used in to the slag composition for the purpose to establish two quality indicators in reduction processes: EW - indicator showing the direction and intensity of reaction in to the slag composition and r - indicator of the rate of coal consumption. Proposed to other qualitative criteria. The analysis was conducted on the example of slag from aluminium metallurgical processes, and slag from the smelting processes of copper and its alloys. Divided influence on the environment and the use slag in other processes. Discusses the quality of the slag as a function of their operating qualities. Highlighted the need qualitative assessment of slag in a broad sense. Indicated the necessity to analysis including the quality of the slag more criteria, including: - technology - suitability for further processes, - operational, environmental and economic benefits.

Źródło:

Archives of Foundry Engineering; 2015, 15, 1 spec.; 9-12
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Model reduction techniques for linear constant coefficient port-Hamiltonian differential-algebraic systems

Autorzy:

Hauschild, Sarah-Alexa
Marheineke, Nicole
Mehrmann, Volker

Powiązania:

https://bibliotekanauki.pl/articles/970123.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

structure-preserving model reduction
index reduction
port-Hamiltonian differential-algebraicsystem
moment matching
effort constraint method
flow constraint method

Opis:

The aim of this paper is to combine model order reduction for differential-algebraic equations with port-Hamiltonian structure preservation. For this, we extend two classes of model reduction techniques (reduction of the Dirac structure and moment matching) to handle port-Hamiltonian differential-algebraic equations. The performance of the methods is investigated for benchmark examples, originating from semi-discretized flow problems and mechanical multibody systems.

Źródło:

Control and Cybernetics; 2019, 48, 1; 125-152
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Influence of solvents on low-temperature reduction-exfoliation of graphene oxide
Wpływ rozpuszczalników na niskotemperaturową redukcję-eksfoliację tlenku grafenu

Autorzy:

Sieradzka, M.
Fryczkowski, R.
Fryczkowska, B.
Biniaś, D.
Ślusarczyk, C.
Rajba, S.
Janicki, J.

Powiązania:

https://bibliotekanauki.pl/articles/946932.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej

Tematy:

thermal reduction of graphene oxide
low-temperature reduction
organic solvents
termiczna redukcja tlenku grafenu
niskotemperaturowa redukcja
rozpuszczalniki organiczne

Opis:

Graphene due to its extraordinary properties and a wide range of potential applications, has aroused a great interest. Although there are many ways to obtain graphene, the existing methods still possess certain disadvantages. Numerous attempts are made to scale up a new and efficient production method of this material on an industrial scale. A very popular method to obtain graphene is a two-step process. It is based on the oxidation of graphite and subsequent reduction to graphene. This article presents a new way of low-temperature reduction of graphene oxide (GO) in presence of various solvents. Indeed, using of appropriate organic solvents in a particular stage of graphene preparation affects the reduction process and the exfoliation of graphene oxide. The possibility to reduce GO in the presence of a disperser opens new paths for the preparation of graphene containing composites.
Grafen cieszy się ogromnym zainteresowaniem ze względu na swoje szczególne właściwości oraz szeroki zakres potencjalnych zastosowań. Znane sposoby otrzymywania grafenu są obarczone pewnymi wadami, co powoduje, że wciąż podejmuje się próby opracowania nowej, skutecznej metody produkcji tego materiału na dużą skalę. Powszechną techniką wytwarzania grafenu jest proces dwuetapowy, polegający na utlenianiu grafitu do jego tlenku, a następnie redukcji do grafenu. W pracy przedstawiono nową metodę niskotemperaturowej redukcji tlenku grafenu (GO) z zastosowaniem różnych rozpuszczalników. Jak wynika z przeprowadzonych badań, użycie odpowiednich rozpuszczalników organicznych na jednym z etapów otrzymywania grafenu pozwala skutecznie zredukować oraz eksfoliować tlenek grafenu. Możliwość redukcji GO w obecności rozpuszczalników odgrywa istotną rolę w procesie otrzymywania kompozytów z udziałem grafenu.

Źródło:

Polimery; 2017, 62, 11-12; 841-847
0032-2725

Pojawia się w:

Polimery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Genesis of hydrogen sulfide in carbonate reservoirs
Geneza siarkowodoru w węglanowych skałach zbiornikowych

Autorzy:

Matyasik, I.
Spunda, K.
Kania, M.
Wencel, K.

Powiązania:

https://bibliotekanauki.pl/articles/1835280.pdf

Data publikacji:

2018

Wydawca:

Instytut Nafty i Gazu - Państwowy Instytut Badawczy

Tematy:

hydrogen sulfide
bacterial sulfate reduction
thermochemical sulfate reduction
main dolomite
siarkowodór
bakteryjna redukcja siarczanów
termochemiczna redukcja siarczanów
dolomit główny

Opis:

The article presents the problem of hydrogen sulfide (H2S) occurring in hydrocarbon deposits and copper mines. The presence of this gas is an immense problem due to the necessity of removing it from liquid and gaseous deposits, threat to miner’s life, a negative impact on the equipment and the need of its utilization. The authors try to determine the origin of hydrogen sulfide in sedimentary basins on the basis of literature data concerning Polish and foreign deposits. The main processes of hydrogen sulfide formation are bacterial sulfate reduction (BSR) and thermochemical sulfate reduction (TSR). Because of similar products of these reactions, the unequivocal identification of the process of hydrogen sulfide formation is a difficult problem to solve. It is necessary to use additional geological and geochemical indicators to identify the origin of this gas. In this article Polish and foreign deposits with documented symptoms of the presence of hydrogen sulfide are compared. In addition, major mechanisms of H2S generation and criteria necessary for the occurrence of BSR and TSR processes are presented. The knowledge gained is essential at the stage of planning the exploitation of the reservoirs in order to predict the hydrogen sulfide presence.
W artykule poruszony został problem występowania siarkowodoru w złożach węglowodorów oraz rud miedzi. Obecność tego gazu jest dużym problemem ze względu na konieczność jego usunięcia z ciekłych i gazowych kopalin, zagrożenia życia górników prowadzących eksploatację w kopalniach, negatywny wpływ na urządzenia oraz konieczności jego zagospodarowania. Autorzy wskazują na genezę siarkowodoru w basenach sedymentacyjnych, na podstawie danych literaturowych dotyczących złóż polskich i światowych. Jako główne procesy powstawania H2S przyjmuje się bakteryjną redukcję siarczanów (BRS), a także termochemiczną redukcję siarczanów (TRS). Ze względu na jednakowe produkty tych reakcji, jednoznaczne określenie procesu powstania siarkowodoru jest problemem trudnym do rozwiązania. Niezbędne jest zastosowanie dodatkowych wskaźników geologicznych i geochemicznych w celu określenia genezy tego gazu. W prezentowanej pracy zestawiono krajowe i zagraniczne złoża w których odnotowano przejawy obecności siarkowodoru. Ponadto przedstawiono główne mechanizmy jego powstawania oraz kryteria które muszą zostać spełnione aby zaistniał proces BRS lub TRS. Zdobyta wiedza jest niezbędna na etapie planowania eksploatacji złóż celem przewidzenia możliwości wystąpienia siarkowodoru.

Źródło:

Nafta-Gaz; 2018, 74, 9; 627-635
0867-8871

Pojawia się w:

Nafta-Gaz

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

An algorithm for reducing the dimension and size of a sample for data exploration procedures

Autorzy:

Kulczycki, P.
Łukasik, S.

Powiązania:

https://bibliotekanauki.pl/articles/330110.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

dimension reduction
sample size reduction
linear transformation
simulated annealing
data mining
redukcja wymiaru
transformacja liniowa
wyżarzanie symulowane
eksploracja danych

Opis:

The paper deals with the issue of reducing the dimension and size of a data set (random sample) for exploratory data analysis procedures. The concept of the algorithm investigated here is based on linear transformation to a space of a smaller dimension, while retaining as much as possible the same distances between particular elements. Elements of the transformation matrix are computed using the metaheuristics of parallel fast simulated annealing. Moreover, elimination of or a decrease in importance is performed on those data set elements which have undergone a significant change in location in relation to the others. The presented method can have universal application in a wide range of data exploration problems, offering flexible customization, possibility of use in a dynamic data environment, and comparable or better performance with regards to the principal component analysis. Its positive features were verified in detail for the domain’s fundamental tasks of clustering, classification and detection of atypical elements (outliers).

Źródło:

International Journal of Applied Mathematics and Computer Science; 2014, 24, 1; 133-149
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Reduction of Greenhouse Gas Emissions by Replacing Fertilizers with Digestate

Autorzy:

Kowalczyk-Juśko, Alina
Pochwatka, Patrycja
Mazurkiewicz, Jakub
Pulka, Jakub
Kępowicz, Barbara
Janczak, Damian
Dach, Jacek

Powiązania:

https://bibliotekanauki.pl/articles/24201726.pdf

Data publikacji:

2023

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

biogas plant
anaerobic digestion
digestate
fertilizing
emission reduction

Opis:

Digestate from a biogas plant can be a valuable organic and mineral fertilizer. Quantitative proportions of cosubstrates used in three agricultural biogas plants in Poland were analyzed. The composition of digestates was examined and large differences in the content of macronutrients were found, especially N and K. On the basis of the factors used to calculate emissions from the production and use of artificial fertilizers, the greenhouse gas (GHG) reduction resulting from replacing mineral fertilizers with digestate was calculated. In terms of 1 Mg of fresh digestate, this reduction may not seem large, as it amounts to 27.9–61.6 kg of CO2 eq, but it should be taken into account that digestate contains little dry matter. The annual amount of digestate used on an area of 1 ha allows avoiding GHG emissions of 25.8–44.5 Mg CO2 eq.

Źródło:

Journal of Ecological Engineering; 2023, 24, 4; 312--319
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

Determinants of women’s empowerment and household poverty reduction in Imbulpe DS Division, Sri Lanka

Autorzy:

Dilini Rathnachandra, S.D.
Pushpa Malkanthi, S.H.

Powiązania:

https://bibliotekanauki.pl/articles/2081189.pdf

Data publikacji:

2021

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

empowerment
poverty reduction
women farmers
Imbulpe
Sri Lanka

Opis:

Women empowerment and poverty reduction are interrelated key driving forces to achieve the sustainable development of a country. However, most of the women farmers in rural areas have lack of access to adequate assets and resources, credit facilities and freedom of decision making within the households. Therefore, women empowerment is a timely important requirement to reduce the household poverty among them. This study was conducted to identify the determinants of empowerment of women farmers and also roles of them in reduction of poverty in Imbulpe Divisional Secretariat (DS) Division in Sri Lanka. In this study, 238 women farmers were selected using simple random sampling method, from purposively identified seven Grama Niladhari (GN) divisions in this area. Primary data was gathered from a field survey using a pre-tested, self-administered questionnaire from May to July 2019. Descriptive statistics and chi-square analysis were used as the statistical methods in data analyzing process. The result revealed that, age, education, monthly income of the respondents, economic resource accessibility, participation in decision making and freedom of mobility act as the determinants of empowerment of women farmers. The moderately significant positive nature of relationship was showed between the age of the women farmers and their role in poverty reduction. And also, the level of education, monthly income, economic resources accessibility of the respondents and participation of decision making within the household of the women farmers were showed moderately significant positive relationship with their role in poverty reduction. Therefore, encourage women farmers as rural entrepreneurs while performing their farming practices to earn additional income, enhance economic resource accessibility and motivate women farmers to express their ideas for enhance the active participation in the household decision making process are timely important requirements to empower women farmers and enhance their role in poverty reduction.

Źródło:

Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2021, 21[36], 4; 76-90
2081-6960

Pojawia się w:

Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

BIAS REDUCTION IN KERNEL ESTIMATOR OF DENSITY FUNCTION IN BOUNDARY REGION

Autorzy:

Baszczyńska, Aleksandra

Powiązania:

https://bibliotekanauki.pl/articles/453760.pdf

Data publikacji:

2015

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki

Tematy:

kernel estimator
density function
bias reduction
reflection method

Opis:

The properties of the classical kernel estimator of density function deteriorate when the support of density function is bounded. The use of classical form of kernel estimator causes the increase of the bias estimator, particularly in the so-called boundary region, close to end of support. It can also lead to undesirable situation where density function estimator has a different support than the density function. The paper presents selected bias reduction procedures, such as reflection method and its modification. An example is presented with an attempt to compare considered procedures.

Źródło:

Metody Ilościowe w Badaniach Ekonomicznych; 2015, 16, 1; 7-16
2082-792X

Pojawia się w:

Metody Ilościowe w Badaniach Ekonomicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

Morphophonological reduction in Swahili: the pressure of frequency and lexical diffusion

Autorzy:

Kraska-Szlenk, Iwona

Powiązania:

https://bibliotekanauki.pl/articles/969694.pdf

Data publikacji:

2010-12-10

Wydawca:

Uniwersytet Warszawski. Wydział Orientalistyczny. Katedra Języków i Kultur Afryki

Tematy:

Morphophonological reduction
Swahili language
frequency and lexical diffusion

Opis:

The article discusses a number of morphophonological alternations in Swahili which vary as to their scope and degree of regularity. It is argued that the allomorphy between syllabic and non-syllabic variants of some morphemes is due to phonological reduction which affects high frequency lexical items first and gradually extends on others by way of lexical diffusion. The analysis is supported by comparing the data of Standard Swahili to less conservative colloquial varieties and non-standardized local dialects, in which reductions are more advanced. The analysis contributes to a better comprehension of synchronic allomorphy and it also sheds light on the mechanism of diachronic change.

Źródło:

Studies in African Languages and Cultures; 2010, 44; 83-102
2545-2134
2657-4187

Pojawia się w:

Studies in African Languages and Cultures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Recursos de objetividad discursiva en algunos lenguajes funcionales

Autorzy:

Bień, Janusz

Powiązania:

https://bibliotekanauki.pl/articles/2079592.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Warszawski. Wydział Neofilologii

Tematy:

discourse analysis
nominalizations
argument reduction
objectivity
specialized languages

Opis:

The so-called discursive objectivity is understood as the distance and neutrality of the speakers toward processes expressed by verbal predicates. This phenomenon is directly related to a high frequency of structures with little grammatical, deictic and temporal information like nominalizations, agentless passive sentences and, on the other hand, to a low frequency about the speaker, of personal pronouns. Obviously, its role depends on the type of text and the use of specialized language. Detailed analysis of an electronic and manually annotated corpora allows us to state that this discursive feature is the most important in the academic and scientific texts and its role decreases in journalistic and narrative ones. The statistical data automatically extracted from the electronically annotated corpora confirms the trend. In spite of structural differences between the four languages, reflected in different frequency of objectivity markers, in each of the languages the number of such markers strongly correlated with each functional style. This in turn leads to a statement that the functional type of text is probably the most decisive factor for many discursive features of the language.

Źródło:

Itinerarios; 2016, 23; 15-34
1507-7241

Pojawia się w:

Itinerarios

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 84.

Tytuł:

Controlled turning process for the production of friction-reduced cylinder liners with a defined free-form geometry

Autorzy:

Denkena, Berend
Bergmann, Benjamin
Handrup, Miriam
Schmidt, Christopher

Powiązania:

https://bibliotekanauki.pl/articles/1833769.pdf

Data publikacji:

2021

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

free-form turning
active cutting tool
friction reduction

Opis:

Friction in the piston-cylinder system of combustion engines has a great influence on fuel consumption. To reduce the friction of combustion engines, free-form cylinder liners and microstructured cylinder liners have proven to be advantageous. However, the combination of both processes is not industrially realized today because of an increased manufacturing effort due to a higher number of process steps. To save resources in form of honing oil in the production, the free-form can be machined by a dry turning process instead of form honing. A combination with the microstructuring process in a single manufacturing step would furthermore reduce non-productive time. This paper presents a piezo-actuated hybrid tool that can carry out both processes. The tool wear and the behavior during free-form fine machining of cylinder liners are investigated. A process control system is introduced that controls the cylinder liner geometry by adapting the process parameters during free-form turning.

Źródło:

Journal of Machine Engineering; 2021, 21, 3; 47--59
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 85.

Tytuł:

A molecular dynamics study of the influence of chemical reduction on the structure of amorphous Germania

Autorzy:

Witkowska, A.
Murawski, L.
Bergmański, G.

Powiązania:

https://bibliotekanauki.pl/articles/1963001.pdf

Data publikacji:

2002

Wydawca:

Politechnika Gdańska

Tematy:

oxide glasses
hydrogen reduction
molecular dynamics
structural modelling

Opis:

The contribution is dedicated to the molecular dynamics (MD) study of the structure of reduced germania glass of composition 1Ge 1GeO2. The work is inspired by a recent report on the formation of Ge clusters in hydrogen reduced germanate glasses containing oxides of heavy metals. The MD simulations have been performed in the microcanonical (NVE) ensemble, using a simple two-body Born-Mayer-Huggins interaction potential. A tendency of germanium atoms to agglomeration into clusters, observed in the present calculations, is compared with an analogous tendency of Bi and Pb atoms, observed previously in the xBi (1-x)GeO2 and xPb (1-x)GeO2 systems. The differences in the short and medium-range order in GeO2 system between the 1Ge 1GeO2 and GeO2 glasses are discussed.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 2; 273-281
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 86.

Tytuł:

Balancing electric power in a microgrid via programmable agents auctions

Autorzy:

Pałka, P.
Radziszewska, W.
Nahorski, Z.

Powiązania:

https://bibliotekanauki.pl/articles/206683.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Instytut Badań Systemowych PAN

Tematy:

multi-agent system
microgrid management
shortshortterm imbalance reduction

Opis:

The paper presents an application of an auction algorithm in a multi-agent computer system for managing the unbalanced energy in a microgrid. The main goal of the system is to control and minimize the deviations of the current energy dem and from the actual energy production, using an auction algorithm. Distributed generation is assumed in the microgrid, with renewable power sources. The energy storages and the controllable power sources improve the system operation. The differences between the actual demand and produced energy are caused by unpredictable level of electric power generation by uncontrolled sources, like wind turbines or solar panels, and/or randomness of power utilization. The system will tend to balance out these differences on-line in short time intervals (less than one minute) to follow-up varying levels of local power generation and loads.

Źródło:

Control and Cybernetics; 2012, 41, 4; 777-797
0324-8569

Pojawia się w:

Control and Cybernetics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 87.

Tytuł:

Automotive vehicle engine mount based on an MR squeeze-mode damper: modeling and simulation

Autorzy:

Sapiński, B.
Snamina, J.

Powiązania:

https://bibliotekanauki.pl/articles/281564.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

engine mount
vibration reduction
MR damper
control
algorithm

Opis:

The study investigates the performance of a semi-active vehicle engine mount incorporating an MR damper working in the squeeze mode (MRSQD), summarising its design, operating principles and key characteristics. The mathematical model of the mount is formulated based on the newly developed MRSQD. Two control algorithms are proposed for MRSQD control. The first algorithm (ALG1) uses the inverse model of the engine-frame system, the other is the sliding mode algorithm (ALG2). The effectiveness of the engine mount system is demonstrated in computer simulation.

Źródło:

Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 377-388
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 88.

Tytuł:

The Special Forces in the age of hybrid warfare

Autorzy:

Podloch, M.

Powiązania:

https://bibliotekanauki.pl/articles/347110.pdf

Data publikacji:

2017

Wydawca:

Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki

Tematy:

hybrid warfare
Special Forces
risk reduction
threat prevention

Opis:

This article attempts to locate the Special Forces in the light of dynamic changes in the environment of national security caused by the situation in Ukraine. The author focuses attention on the issues related to the outline of the essence of activities referred to as “hybrid”, and the possibility of using the Special Forces’ potential in terms of identification and elimination of threats, being a tool of these activities. The analysis of the potential has been performed at two levels: reducing risks and countering threats.

Źródło:

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2017, 2; 48-58
1731-8157

Pojawia się w:

Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 89.

Tytuł:

Spectroscopic characteristics of FeI-phthalocyanine

Autorzy:

Kaczmarzyk, T.
Jackowski, T.
Dziliński, K.

Powiązania:

https://bibliotekanauki.pl/articles/148333.pdf

Data publikacji:

2007

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

iron phthalocyanine
reduction process
Mössbauer spectroscopy
EPR
DTF

Opis:

Results of Mössbauer and EPR study of a univalent-iron phthalocyanine complex (FeIPc) are presented in this paper. FeIPc has been obtained from FeIIPc by the chemical reduction method in tetrahydrofuran (THF) and dimethoxyethan (DME) solutions. Like in the case of FeI-porphyrin complexes, Mössbauer and EPR data as well as quantum calculations of electronic absorption spectra confirm in this case a low-spin configuration of FeI ions with an unpaired electron located at dz2 orbital. Interaction between FeIPc and THF molecules does not change significantly the electron configuration of FeI ions coordinated to phthalocyanine ligand.

Źródło:

Nukleonika; 2007, 52, supl. 1; 99-103
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 90.

Tytuł:

Modelling and simulation of a new variable stiffness holder for milling of flexible details

Autorzy:

Kaliński, K. J.
Galewski, M. A.
Mazur, M.
Chodnicki, M.

Powiązania:

https://bibliotekanauki.pl/articles/259636.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

milling
vibration reduction
optimum spindle speed
optimum stiffness

Opis:

Modern industry expectations in terms of milling operations often demand the milling of the flexible details by using slender ball-end tools. This is a difficult task because of possible vibration occurrence. Due to existence of certain conditions (small depths of cutting, regeneration phenomena), cutting process may become unstable and self-excited chatter vibration may appear. Frequency of the chatter vibration is close to dominant natural frequency of the workpiece or the tool. One of the methods of chatter vibration avoidance is matching the spindle speed to the optimum phase shift between subsequent cutting edges passes (i.e. the Liao-Young condition). However, the set of optimum spindle speeds from the point of view of vibration reduction may be not optimum one from other points of view. For example milling efficiency or machine tool capabilities cannot be assured. This article presents the idea of a workpiece holder with adjustable stiffness and discusses a new variant of its realization. In the holder, milling process is performed at constant spindle speed and feed speed. In order to avoid vibration the holder stiffness is modified. Stiffness changes modify natural frequencies of the workpiece and thus it is possible to modify dynamic properties of the workpiece in such a way that arbitrary chosen, constant spindle speed will be optimum, due to the Liao-Young condition performance. Calculation of the optimum stiffness is performed before milling, based on the workpieces modal identification results and the finite element model simulations.

Źródło:

Polish Maritime Research; 2017, S 1; 115-124
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 91.

Tytuł:

On Reduction in English: What the English Don’t Say

Autorzy:

Tomaka, Maciej

Powiązania:

https://bibliotekanauki.pl/articles/601277.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

reduction, elision, connected speech, British English, oral performace

Opis:

The aim of this article is to examine which sounds are most often omitted in official oral public performances by native speakers of British English. Such terms as reduction, elision (and its types), and connected speech are explained; the literature cited is concerned with elision of vowels (triphthong smoothing being treated separately), of consonants, and of whole syllables. The study presents the results of an analysis conducted on selected material available on the Internet – this comprises three British English oral performances of the total length of approximately 20 minutes. With regard to the nature of the data, they were divided into scripted, semi-scripted, and unscripted samples. The research has shown that earlier preparation significantly lowers the number of phonetic reduction phenomena. Furthermore, if the speech is given in front of an audience rather than being pre-recorded, the number of reduction phenomena is higher. Besides, the analysis has shown a few important tendencies in modern British pronunciation, such as omission of /t/, realisation of final /t/ as [ʔ], omission of final /t/ in contractions, which therefore are realised as [n] instead of [nt]. 

Źródło:

New Horizons in English Studies; 2017, 2
2543-8980

Pojawia się w:

New Horizons in English Studies

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 92.

Tytuł:

Zastosowanie cyjanobakterii w biotransformacji 2-oksopropanofosfonianu dietylu
Application of cyanobacteria as biocatalysts for the reduction of diethy-l2-oxopropylphosphonate

Autorzy:

Górak, M.
Żymańczyk-Duda, E.

Powiązania:

https://bibliotekanauki.pl/articles/142867.pdf

Data publikacji:

2014

Wydawca:

Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem

Tematy:

biotransformacja
cyjanobakterie
redukcja ketofosfonianów
biotransformation
cyanobacteria
oxoalkylphosphonates reduction

Opis:

Celem przeprowadzonych badań było zastosowanie mikroorganizmów fotoautotroficznych jako biokatalizatora w redukcji -ketoalkilofosfonianu dietylu. Przeprowadzone badania przesiewowe wskazały szczepy cyjanobakterii Arthrospira maxima CCALA 027 oraz Nodularia sphaerocarpa CCALA 114 jako zdolne do redukcji 2-oksopropanofosfonianu dietylu do odpowiedniego 2-hydroksypropanofosfonianu dietylu. W trakcie 7-dniowego procesu biokonwersji stopień przereagowania substratu w przypadku zastosowania wymienionych szczepów wynosił odpowiednio 26,4% oraz 12,9%, zaś czystość optyczna produktu w obu przypadkach wyniosła ponad 99%.
The aim of the study was applying of autotrophic microorganisms as a biocatalyst in the reduction of oxoalkylphosphonates. Cyanobacteria strains Arthrospira maxima CCALA 027 and Nodularia sphaerocarpa CCALA 114 are capable to reduce diethyl 2- oxopropylphosphonate to the corresponding diethyl 2- hydroxypropylphosphonate. The degree of conversion of the substrate was respectively 26.4% and 12.9%, and the optical purity of the product in both cases was over 99%.

Źródło:

Chemik; 2014, 68, 2; 123-128
0009-2886

Pojawia się w:

Chemik

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 93.

Tytuł:

Influence of the Inter Teeth Volumes on the Noise Generation in External Gear Pumps

Autorzy:

Fiebig, W.

Powiązania:

https://bibliotekanauki.pl/articles/177707.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

gear pumps
noise reduction
simulation
inter teeth volume

Opis:

The paper shows the new method for noise reduction in external gear pumps based on the analysis of the pressure in inter teeth volumes. The simulation model and measurement results of pressure changes in the inter teeth volume has been presented. Based on simulation results an additional volume has been obtained, which is connected to the inter teeth volume (decompression filter volume). Due this additional volume the build down processes in the pump are longer and the pressure overdue in the inter teeth volumes are smaller. This leads to the reduction of the dynamical excitation forces inside the pump and noise, especially in the higher frequency range I.

Źródło:

Archives of Acoustics; 2014, 39, 2; 261-266
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 94.

Tytuł:

Evaluation of the Effect of a Step Change in Piezo Actuator Structure on Vibration Reduction Level in Plates

Autorzy:

Wiciak, J.
Trojanowski, R.

Powiązania:

https://bibliotekanauki.pl/articles/177942.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

vibration reduction
two-part elements
different material composition

Opis:

This paper presents numerical analyses and a physical experiment on efficiency of different shapes and material composition of piezo actuators on vibration reduction. For this purpose numerical models of a plate clamped on all sides with piezo actuators attached were developed. The elements used were either standard homogeneous elements or the proposed two-part elements with different material composition for inner and outer part of piezo ceramic. Numerical analyses were performed using ANSYS software.

Źródło:

Archives of Acoustics; 2015, 40, 1; 71-79
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 95.

Tytuł:

Ontological Freedom in Jan Patočka’s “Natural World as a Philosophical Problem” with Regard to Husserl’s Phenomenology

Autorzy:

Rybák, David

Powiązania:

https://bibliotekanauki.pl/articles/549643.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie

Tematy:

phenomenology
phenomenological reduction
ontology
education
intersubjectivity
language
world

Opis:

In his post-doctoral dissertation Přirozený svět jako filosofický problém (The Natural World as a Philosophical Problem; orig. publ. 1936) Jan Patočka critically deals with modern metaphysics of subjectivity, at the same time introducing phenomenology with its phenomenological reduction. I would like to investigate this issue in the text just mentioned and briefly compare the similarities and differences in Edmund Husserl’s phenomenology. Patočka provides a deepening of phenomenology by approaching the ontological conditions for the phenomenological reduction in the negativity of freedom in which the spontaneity of ‘having-the-world’ originates.

Źródło:

Forum Pedagogiczne; 2019, 9, 1; 203-212
2083-6325

Pojawia się w:

Forum Pedagogiczne

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 96.

Tytuł:

Feasibility study on preparation of magnesium titanate in carbonthermic reduction of vanadium titanomagnetite concentrates

Autorzy:

Chen, Chao
Sun, Ti-Chang
Kou, Jue
Wang, Xiao-Ping
Zhao, Yong-Qiang

Powiązania:

https://bibliotekanauki.pl/articles/110181.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

vanadium titanomagnetite
carbonthermic reduction
magnesium titanate
formation mechanism

Opis:

Effect of temperature and Mg:Ti ratio on phase composition and microstructure of reduced pellets was investigated to verify the feasibility of preparation of magnesium titanate by adding MgO in carbonthermic reduction of the vanadium titanomagnetite concentrates (VTC). Thermodynamic analysis results showed that magnesium titanate is more easily generated than FeTi2O5 or TiO2 by the reaction of FeTiO3 and MgO under the reductive atmosphere, which was confirmed by the discovery of magnesium titanate at roast experiment. It was found that the optimum conditions for reduction of VTC pellets were temperature of 1250 ºC and Mg:Ti ratio of 2, and the main phases of reduction product were metallic Fe and magnesium titanate (Mg2TiO4). However, trace iron impurities in Mg2TiO4 particles were found by energy-dispersive spectroscopy (EDS), so further purification is required.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 2; 417-425
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 97.

Tytuł:

Effect of mechanical activation on carbothermic reduction and nitridation of titanomagnetite concentrates

Autorzy:

Wen, Xiaojin
Yu, Wen
Zeng, Danliang
Zhu, Liang Liang
Chen, Jiangan

Powiązania:

https://bibliotekanauki.pl/articles/1446680.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

titanomagnetite concentrates
carbothermic reduction
mechanical activation
titanium nitride

Opis:

The carbothermic reduction and nitridation process of titanomagnetite concentrates with the help of mechanical activation were investigated by particle size analysis, thermodynamic calculation, thermogravimetric analysis, X-ray diffraction analysis, scanning electron microscopy, and energy-dispersive spectroscopy analysis. The thermogravimetric and X-ray diffraction results indicated that either the reduction of iron oxide or the reduction and nitridation of M3O5 to TiN could be promoted significantly with the increase in activation time. The results obtained from scanning electron microscopy and energy-dispersive spectroscopy showed that, when samples were not activated, chunks of and thin M3O5 were derived from the reduction of ilmenite and titanomagnetite. They were severely sintered with impurities to form a dense structure. As a result, M3O5 was difficult to be converted to TiN, especially chunks of M3O5. However, when samples were activated, the sintering degrees of the impurity and M3O5 were mitigated, and the particle size of the iron as a medium for delivering C to M3O5 was decreased in the roasted product. This condition enhanced the diffusion of C to the surface of M3O5. Meanwhile, the bulk of ilmenite was broken in the activation process, which prevented the formation of chunks of M3O5. Thus, the conversion of M3O5 to TiN was promoted.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 5; 33-45
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 98.

Tytuł:

The Oxygen Reduction Activity of Nitrogen-doped Graphene

Autorzy:

Jian-feng, Liu
Ge, Sun
Ting, Wang
Kai, Ning
Bin-xia, Yuan
Wei-guo, Pan

Powiązania:

https://bibliotekanauki.pl/articles/2174819.pdf

Data publikacji:

2022

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Nitrogen Doping
Graphene
Oxygen Reduction Activity
Molecular Simulation

Opis:

Graphite nitrogen, pyridine nitrogen and pyrrole nitrogen are the main nitrogen types in nitrogen-doped graphene materials. In order to investigate the mechanism of the oxygen reduction activity of nitrogen-doped graphene, several models of nitrogen-doped graphene with different nitrogen contents and different nitrogen types are developed. The nitrogen content is varied from 1.3 at% to 7.8 at%, and the adsorption energy is calculated according to the established models, then the band gaps are analyzed through the optimization results, so as to compare the mag-nitude of the conductivity. Finally, the oxygen reduction activity of graphite nitrogen-doped graphene (GNG) is found to be better than pyridine nitrogen-doped graphene (PDNG) and pyrrole nitrogen-doped graphene (PLNG) when the nitrogen content is lower than 2.6 at%, and the oxygen reduction activity of PDNG is the best when the nitrogen content was higher than 2.6 at%.

Źródło:

Polish Journal of Chemical Technology; 2022, 24, 3; 29--34
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 99.

Tytuł:

Sound Insulation of Dwellings Façades : the Case of Santiago de Chile

Autorzy:

Meza, Leonardo
Delannoy, Jaime
Marzzano, Antonio
Fuentes, Mauricio

Powiązania:

https://bibliotekanauki.pl/articles/176347.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

sound reduction index
construction quality
acoustic insulation
façade

Opis:

The increment in the number of automobiles and the densification of the city has increased noise pollution rates. In addition, the lack of regulation in Chile regarding the acoustic insulation of façades is a problem of a growing concern. The main objective of the present study was to obtain a model of the Sound Insulation of housing, façades, stratified in Santiago, Chile, based on constructive variables. It is expected to serve as a basis for one future regulation for acoustic façades of houses. In the present study, tests based on the international ISO 140-5 standard were carried out in situ. An estimation model of the Standardized Level Difference D_ls;2m;nT;w + C, was obtained based on the opening/façade proportion, and the type of glass used for the windows.

Źródło:

Archives of Acoustics; 2019, 44, 1; 99-104
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 100.

Tytuł:

Problemy redukcji złożonych modeli obiektów sterowania
Problems of a complex plant models reduction

Autorzy:

Rydel, M.
Stanisławski, W.

Powiązania:

https://bibliotekanauki.pl/articles/157192.pdf

Data publikacji:

2010

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

redukcja modelu
modele złożone
model reduction
complex models

Opis:

W artykule zaprezentowano zagadnienia związane z redukcją złożonych modeli obiektów sterowania. Przedstawiono podstawowe grupy metod redukcji wraz z omówieniem ich wad i zalet dla celów redukcji złożonych modeli obiektów sterowania. Zaproponowano wprowadzenie nowej miary błędu aproksymacji dla oceny dokładności aproksymacji modelu zredukowanego. Dobór parametrów metod redukcji pod kątem minimalizacji tej miary błędu umożliwia uzyskanego znacznie lepszych rezultatów redukcji niż minimalizacja normy Hankela błędu aproksymacji.
Model order reduction problems of complex control model are presented in this paper. The article presents basic method group of complex control models reduction. Out of the many methods known from the literature, the methods based on balancing a system and then reducing it (SVD method) have become of great significance [1, 2, 5, 6, 10, 11, 13, 17, 23]. Also Krylov-based approximation methods are widely used, which are based on moment matching of the impulse response of the reduced system [1-3, 7, 9, 20]. Most of the MIMO models are characterized by large differences in gain characteristic and gain variability in frequency function (Fig. 1). The Hankel norm of approximation error (4) can't be used to estimate quality of approximation gain characteristic (Fig. 2). Authors propose in the paper new approximation error measure for reduced models of control objects (5). Minimizing this approximation error for selection of method reduction parameters gives better results than minimizing Hankel norm of approximation error (Tab. 1, Fig. 2). The reduction results of a structural model of component 1r (Russian service module) of the International Space Station [4] are also described in the paper [4].

Źródło:

Pomiary Automatyka Kontrola; 2010, R. 56, nr 2, 2; 197-200
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

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