Search results

1

Hydrodynamic cavitation: from theory towards a new experimental approach

100%

Lucia U., Gervino G.

Open Physics

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2009

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vol. 7

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issue 3

638-644

EN

Hydrodynamic cavitation is analysed by a global thermodynamics principle following an approach based on the maximum irreversible entropy variation that has already given promising results for open systems and has been successfully applied in specific engineering problems. In this paper we present a new phenomenological method to evaluate the conditions inducing cavitation. We think this method could be useful in the design of turbo-machineries and related technologies: it represents both an original physical approach to cavitation and an economical saving in planning because the theoretical analysis could allow engineers to reduce the experimental tests and the costs of the design process.

2

Rediscussion of charged dilaton-axion black hole entropy

100%

Wang C., Gui Y.

Open Physics

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2009

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vol. 7

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issue 3

521-526

EN

We rediscuss the entropy of a charged dilaton-axion black hole for both the asymptotically flat and non-flat cases by using the thin film brick-wall model. This improved method avoids some drawbacks in the original brick-wall method such as the small mass approximation, neglecting the logarithm term, and taking the term L 3 as the contribution of the vacuum surrounding the black hole. The entropy we obtain turns out to be proportional to the horizon area of the black hole, conforming to the Bekenstein-Hawking area-entropy formula for black holes.

3

Analysis of the horizontal structure of a measurement and control geodetic network based on entropy

100%

Mrówczyńska M.

Geodesy and Cartography

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2013

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vol. 62

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issue 1

4

Using of Entropy at Estimation Business Risks

88%

Savina N. B., Slyusarenko N. V., Yakobchuk M. S., Gromaszek K., Smailova S., Muslimov K., Savina N. B., Slyusarenko N. V., Yakobchuk M. S., Gromaszek K., Smailova S., Muslimov K.

International Journal of Electronics and Telecommunications

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2021

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vol. 67

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issue 2

5

The characteristics of the kinematics of the post-mining dislocation process

88%

Piwowarski W., Piwowarski W.

Geodesy and Cartography

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2004

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vol. 53

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issue 3-4

6

The use of Lempel-Ziv complexity to analyze turbulence and flow randomness based on velocity fluctuations

88%

Blonski S., Pregowska A., Michalek T., Szczepanski J.

Bulletin of the Polish Academy of Sciences: Technical Sciences

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2019

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issue 5

7

Simultaneous thermodynamic simulation of CNG filling process

88%

Deymi-Dashtebayaz M., Farzaneh-Gord M., Reza Rahbari H.

Polish Journal of Chemical Technology

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2014

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vol. 16

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issue 1

7-14

EN

In CNG station, the fuel is usually stored in the cascade storage bank to utilize the station more efficiently. The cascade storage bank is generally divided into three reservoirs, commonly termed low, medium and high-pressure storage bank. The pressures within these reservoirs have huge effects on the performance of the stations. In the current study, a theoretical simulation based on mass balance and thermodynamic laws has been developed to study the dynamic fast fi lling process of vehicle’s (NGV) cylinder from the cascade storage bank. The dynamic change of the parameters within the storage bank is also considered. Natural gas is assumed to contain only its major component, methane, and so thermodynamic properties table has been employed for finding the thermodynamics properties. Also the system is assumed as a lumped adiabatic system. The results show that the initial pressure of the cascade storage bank has a big effect on the storage bank volumes for bringing up the NGV cylinder to its target pressure (200 bar). The results also showed that ambient temperature has effect on the refueling process, chiefly the final NGV cylinder and the cascade storage bank conditions

8

Entropy of charged dilaton-axion black hole with minimal length revisited

88%

Wang C., Gui Y., Xing L.

Open Physics

|

2009

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vol. 7

|

issue 3

630-637

EN

Using the generalized uncertainty principle, we calculate the entropy of the charged dilaton-axion black hole for both asymptotically flat and non-flat cases by counting degrees of freedom near the horizon. The divergence of density of states and free energy appearing in the thin film brick-wall model is removed without any cutoff. The entropy proportional to the horizon area is derived from the contribution of the vicinity of the horizon.

9

A quantum version of the classical Szilard engine

75%

Bracken P.

Open Physics

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2014

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vol. 12

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issue 1

1-8

EN

A reinvention of the classical Maxwel demon was proposed by Szilard around the time quantum mechanics was developed. His model continues to attract great interest, especially quantum versions of it. A quantum formulation of the Szilard engine is introduced and investigated here. It is made to operate through specified cycles in such a way that all thermodynamic quantities which pertain to the system can be evaluated exactly in closed form along each sequence of steps through a cycle. It is shown that as a result of the structure of the model, it is possible to calculate and compare various thermodynamic quantities as the engine proceeds around a well defined specific cycle.

10

Optimizing information processing in brain-inspired neural networks

75%

Paprocki B., Pregowska A., Szczepanski J., Paprocki B., Pregowska A., Szczepanski J.

Bulletin of the Polish Academy of Sciences: Technical Sciences

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2020

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issue 2

11

The Criterion of Minimum Entropy Production in Eutectic Growth

75%

Trepczyńska-Łent M.

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issue 2

12

Karcinogenna entropia

63%

Klimek R., Kolenda Z.

Current Gynecologic Oncology

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2012

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vol. 10

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issue 3

185-193

EN

According to the laws of thermodynamics, a cell, threatened by the end of its metabolism, can extend its life in a neoplastic form by reducing the production of its entropy while at the same time increasing dissipation of matter and energy in its surroundings. The basis for the progression of all irreversible processes including life and of course carcinogenesis are changes (d) in the value of entropy production (diS) in time (dt), called by the names of the sources of generated entropy: di S dt Sgen, for which Sgen 0. For that reason prophylactic and oncological treatment must always take the ageing of the body and the primary illnesses this brings into consideration. The source of entropy production is life itself, meaning a constant spontaneous exchange of matter, information, and the energy of elementary particles. The entropy of living organisms is produced by coupled molecular processes increasing (positive source) and decreasing (negative source) its magnitude. Is such a transformation of cellular forms of life only the initial states of cells and the neoplasms derived from them, while an intermediate state of dysplasia is characterized by an increased fluctuation of opposing metabolic processes. Human health is determined by the material-energy condition of the germ cells which are responsible for the intergenerational passageof life, thus contributing to the creation of individuals with new identities. The processes are programmed as early as at the time of the conception of an individual. The increasingly widespread use of drugs as well as the rising use of contraceptive pills by women, combined with the ever more numerous Cesarean sections, reduced lactation, or delayed first pregnancy help explain the increasingly frequent incidence of cancer diseases.

PL

Zgodnie z prawami termodynamiki zagrożona kresem swego metabolizmu komórka może przedłużyć swoje życie w formie nowotworowej poprzez zmniejszenie produkcji własnej entropii z równoczesnym zwiększeniem rozpraszania (dysypacji) materii i energii w otoczeniu. Podstawę przebiegu wszystkich procesów nieodwracalnych, w tym życia i oczywiście karcinogenezy, stanowią zmiany (d) wartości produkcji entropii (diS) w czasie (dt), noszące nazwę źródeł entropii generowanej: di S dt Sgen, dla których Sgen 0. Dlatego profilaktyka i leczenie onkologiczne musi uwzględniać starzenie się organizmu i zawsze towarzyszące temu wcześniejsze schorzenia. Źródłem produkcji entropii jest życie, czyli ciągła, spontaniczna i wzajemna zamiana materii, informacji i energii cząstek elementarnych. Entropię żywych organizmów produkują sprzężone wzajemnie procesy molekularne zwiększające (dodatnie źródła) i zmniejszające (ujemne źródła) jej wielkości. W takiej przemianie komórkowych form życia stabilne są tylko stany wyjściowe komórek i powstałe z nich nowotwory, a pośredni stan dysplazji charakteryzuje się zwiększoną fluktuacją przeciwstawnych procesów metabolicznych. Ludzkie zdrowie jest zdeterminowane przez materialno-energetyczny stan komórek rozrodczych, które są odpowiedzialne za międzypokoleniowy przekaz życia. Procesy te są już zaprogramowane w momencie poczęcia. Wzrastające zużycie leków, a także rosnąca liczba kobiet stosujących pigułki antykoncepcyjne w połączeniu z coraz większą liczbą cięć cesarskich i skróconych laktacji oraz z opóźnieniem pierwszej ciąży pomagają wyjaśnić wzrost częstości występowania chorób nowotworowych.

Refine search results

Hydrodynamic cavitation: from theory towards a new experimental approach

Rediscussion of charged dilaton-axion black hole entropy

Analysis of the horizontal structure of a measurement and control geodetic network based on entropy

Using of Entropy at Estimation Business Risks

The characteristics of the kinematics of the post-mining dislocation process

The use of Lempel-Ziv complexity to analyze turbulence and flow randomness based on velocity fluctuations

Simultaneous thermodynamic simulation of CNG filling process

Entropy of charged dilaton-axion black hole with minimal length revisited

A quantum version of the classical Szilard engine

Optimizing information processing in brain-inspired neural networks

The Criterion of Minimum Entropy Production in Eutectic Growth

Karcinogenna entropia