Temat: reduction - Prolib Integro

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
Tematy:: reduction potential
DT-diaphorase
nitroaromatic compounds
reduction mechanism
explosives; Pokaż więcej
Wydawca:: Polskie Towarzystwo Biochemiczne
Powiązania:: https://bibliotekanauki.pl/articles/1041217.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

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
Tematy:: resources reutilization
nickel slag
particle size
direct reduction
reduction characteristics; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2049420.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Raport Badawczy = Research Report ; RB/27/2004
Algorithm SBT in Argument Reduction
Autorzy:: Sęp, Krzysztof. Autor
Wydawca:: Instytut Badań Systemowych. Polska Akademia Nauk
Systems Research Institute. Polish Academy of Sciences
Powiązania:: Raport Badawczy = Research Report
Opis:: 8 pages ; 21 cm
Bibliografia s. 6-8
Bibliography p. 6-8
The new method in this article LJ greedy argument reduction strategy was proposed. The computer tests shown that the solutions generated by LJ algorithm were not the minimal sets in the sense of cardinality. Therefore, the presented heuristic improve the quality of solutions when it is applied as the post - processing method.
8 stron ; 21 cm
Dostawca treści:: RCIN - Repozytorium Cyfrowe Instytutów Naukowych

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Skocz do pozycji: 4.

Tytuł:: Reduction of vibrations generated by a variable torque in 5-cylinder in-line engines
Autorzy:: Iskra, A.
Tematy:: reduction of vibrations; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247235.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Asymmetrical PZT Applied to Active Reduction of Asymmetrically Vibrating Beam – Semi-Analytical Solution
Autorzy:: Brański, Adam
Kuras, Romuald
Tematy:: beam
actuator (PZT)
active vibration reduction
vibration reduction coefficient
effectiveness coefficient.; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/31339957.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: PZT Asymmetrical Shape Optimization in Active Vibration Reduction of Triangular Plates
Autorzy:: Brański, Adam
Kuras, Romuald
Tematy:: triangular plate
actuator (PZT)
active vibration reduction
vibration reduction coefficient
effectiveness coefficient; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/31339818.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Prehistoric quartz quarries and quarrying in Eastern Middle Sweden
Autorzy:: Lindgren, Christina
Wydawca:: Institute of Archaeology and Ethnology Polish Academy of Sciences
Powiązania:: Olausson, D. 1986. Intrasite spatial analysis in Scandinavian Stone Age research. A discussion of theory. Meddelanden från Lunds Universitets Historiska Museum 1985-1986. Lund
Bennet, A. 1977. Fornlämning 280 förhistoriskt kvartsbrott? Fittja, Botkyrka sn, Södermanland. Riksantikvarieämbetet och Statens Historiska Museums Kapport Undersökningsverksamheten 27. Stockholm
Callahan, E. 1987. An evaluation of the lithic technology in eastern middle Sweden during the Mesolithic and Neolithic. AUN 9. Uppsala
Gustafsson, P. and C. Lindgren in prep. The Eklundshov site. In Södertorn. Interdisciplinary investigation of Stone Age sites in eastern middle Sweden, Å. Âkerlund, E. Olsson, P. Gustafsson and U. Miller (eds). Riksantikvarieämbetet Byrån för Arkeologiska Undersökningar
Luedtke, B.E. 1984. Lithic demand and quarry production. In Prehistoric quarries and lithic production, J. Ericson and B. Purdy (eds). Cambridge
Binford, L. R. 1973. Interassemblage variability — the Mousteriean and the functional argument. In The explanation of cultural change, C. Renfrew (ed). London
Luho, V. 1956. Die Askolakultur. Finsk Fornminnestidskrift 57
Rudbeck, E. 1987. Flintmining in Sweden during the Neolithic Period. In The human use of flint and chert. Proceedings of the fourth international flint symposium held at Brighton Polytechnic 10 -15 april G. de G. Sieveking and M.H. Newcomber M.H. (eds). Cambridge
Möller, H. and G. Stålhös 1969. Beskrivning till geologiska kartbladet Stockholm SO. Sveriges geologiska undersökningar Serie Ae nr 3. Stockholm
Kihlstedt, B. in prep. The Kvedesta site. In Södertörn. Interdisciplinary investigation of Stone Age sites in eastern middle Sweden, Å. Åkerlund, E. Olsson, P. Gustafsson and U. Miller (eds). Riksantikvarieämbetet Byrån för Arkeologiska Undersökningar
Broadbent, N. 1979. Coastal resources and settlement stability. A critical study of a Mesolithic site complex in Northern Sweden. AUN 3 Uppsala
Welinder, S. 1977. The Mesolithic Stone Age of Eastern Middle Sweden. Antikvariskt Arkiv 65. Stockholm
Archaeologia Polona
Thorsberg, K. 1986. Bipolar teknik i flinta. Nigra funderingar. Fjölnir 2. Uppsala
Holm, L. 1994. Stone artifacts as transmitters of social information. Towards a wider interpretation with a North Swedish example. In Current Swedish archaeology, M. Burström and A. Carlsson (eds), Vol. 2:151-8. Stockholm
Kihlstedt, B. 1992. Arkeologisk utredning etapp 1 Gladö Industriomráde. Södermanland Huddinge socken Björksättra 1:4. Riksantikvarieämbetet, Byrån för arkeologiska undersökningar Kapport 1992:45
Risberg, J., U. Miller and L. Brunnberg 1991. Deglaciation, Holocene shore displacement and coastal settlements in Eastern Svealand, Sweden, Quaternary International 9:33—7
Rudbeck, E. 1986. Ängdala. Flintgruvor frân yngre stenaldern, S. Sallerup. Utgrävningar 1977—81. Kapport Nr I Malmö Museum
Lindgren, C. 1994. Ett bipolärt problem — Om kvartsteknologi under mesolitikum. In Aktuell Arkeologi IV. K. Hauptman Wahlgren (ed.). Stockholms Archaeological Reports 29. Stockholm
Olsson, E. and A. Vinberg 1994. Boplatser i Nolingeomrâdet. Kiksantikvarieämbetet Byrån för arkeologiska undersökningar. Rapport 26
Lindman, G. 1991. Smâskalig utvinning av kvarts. In Skärvor och fragment. Västgöta-Dal 1989—90. Vänersborg
Althin, C-A. 1951. The Scanian flint mines. Meddelandenfran Lunds Universitets Historiska Museum, 139—5 8. Lund
Opis:: In Sweden the flint mines of Angdala have often been regarded as representative of lithic procurement. During recent years several sites in Sweden have been interpreter as quartz quarrying sites. Some of these sites are situated in eastern middle Sweden where flaked quartz is common on the Stone Age settlements. This article presents these quarrying sites and discuss some problems related to their interpretation, especially in relations to the Mesolithic period. There are several problems related to the study of quartz quarries, e.g., the problem of dating them. The demand for raw material can be measured through the following variables: activities using stone tools, lithic technology and the efficiency of the stone tools. Some of these variables give contradictory results when used in analysis of flaked quartz in the region. The quarrying sites are however an important source of information for studies regarding lithic strategies in stone Age society
il. ; 24 cm
ill. ; 24 cm
Dostawca treści:: RCIN - Repozytorium Cyfrowe Instytutów Naukowych

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Skocz do pozycji: 8.

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.
Tematy:: multibody systems
model reduction
parametric reduction
odkształcenia sprężyste
model redukcji
metoda parametryczna; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/950682.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Wpływ modyfikacji zębów na zjawiska dynamiczne w przekładni zębatej w różnych warunkach eksploatacyjnych
Autorzy:: Peruń, G.
Tematy:: przekładnia zębata
redukcja drgań
redukcja hałasu
gear
reduction of vibrations
noise reduction; Pokaż więcej
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Powiązania:: https://bibliotekanauki.pl/articles/196381.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Transition to metallic and superconducting states induced by thermal or electrical deoxidation of the dislocation network in the surface region of SrTiO$_{3}$
Autorzy:: Rogacki, Krzysztof
Speier, Wolfgang
Keller, Hugo
Szot, Krzysztof
Rodenbücher, Christian
Krok, Franciszek
Roleder, Krystian
Simon, Arndt
Bihlmayer, Gustav
Bussmann-Holder, Annette
Opis:: The question as to why deoxidized SrTiO$_{3- \delta}$ becomes metallic and superconducting at extremely low levels of oxygen vacancy concentration has been a mystery for many decades. Here, we show that the real amount of effused oxygen during thermal reduction, which is needed to induce superconducting properties, is in the range of only 10$^{14}$/cm$^{3}$ and thus even lower than the critical carrier concentrations assumed previously (10$^{17}$–10$^{19}$/cm$^{3}$). By performing detailed investigations of the optical and electrical properties down to the nanoscale, we reveal that filaments are forming during reduction along a network of dislocations in the surface layer. Hence, a reduced epi-polished SrTiO$_{3- \delta}$ crystal has to be regarded as a nano-composite consisting of a perfect dielectric matrix with negligible carrier density, which is short-circuited by metallic filaments with a local carrier density in the range of 10$^{20}$/cm$^{3}$. We present that electro-degradation leads to a more pronounced evolution of filamentary bundles and thus can generate a superconducting state with higher T$_{C}$ than thermal reduction. These findings indicate that traditional homogeneous models of superconductivity in self-doped SrTiO$_{3- \delta}$ need to be revised, and we propose an alternative explanation taking into account the coexistence of metallic dislocation cores with polar insulating regions allowing for polaronic coupling.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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