Wyniki wyszukiwania - BazTech

1

A nanoscale simulation study of elastic properties of gaspeite

Benazzouz B.-K.

Studia Geotechnica et Mechanica

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2014

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Vol. 36, nr 2

9--16

EN

The study of structural and mechanical properties of carbonate rock is an interesting subject in engineering and its different applications. In this paper, the crystal structure of gaspeite (NiCO3) is investigated by carrying out molecular dynamics simulations based on energy minimization technique using an interatomic interaction potential. At first, we focus on the structural properties of gaspeite mineral. And then, the elastic properties are calculated, including the elastic constants, bulk modulus, shear modulus, the S- and P-wave velocities. In the next part of this paper, the pressure effect will be studied on the structural and elastic properties of NiCO3 at high pressure.

2

Wpływ ciśnienia na rozdział wody dla wybranych elementów wylotowych instalacji tryskaczowych

Domżał A., Wnęk W., Kubica P., Boroń S., Graba M.

Materiały Budowlane

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2014

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nr 10

125--126

PL

W artykule przedstawiono wyniki badań laboratoryjnych rozdziału wody poniżej i powyżej deflektora dla wybranych elementów wylotowych instalacji tryskaczowych. Badano cztery wybrane rodzaje tryskaczy rozpylających o stałych wypływu K = 57, K = 80, K = 150. Celem badań było ustalenie, w jaki sposób ciśnienie zmieniające się w zakresie 0,5 – 5,0 bar wpływa na rozdział wody poniżej i powyżej deflektora, a w efekcie, jak wiedza o rozdziale wody może wpływać na dobór tryskaczy do konkretnych zastosowań.

EN

The article presents the results of laboratory studies on the distribution of water below and above the deflector for selected elements of the exhaust fixed sprinkler systems. The study involved four selected types of spray – fixed outflow of K = 57, K = 80, K = 150. The aim of the study was to determine how, for selected sprinkler pressure variable in the range of 0,5 – 5,0 bar affects the distribution of water below and above the deflector, and, therefore, the knowledge of the distribution of water may affect the selection of a specific application of sprinklers.

3

Influence of Pressure and Load on Radial Deformation of the Tyre

Olszewski Z., Waluś K. J.

Machine Dynamics Research

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2012

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Vol. 36, No. 3

65-71

EN

Adhesive tire-road interaction significantly depends on the tyre operational parameters and directly affects safety of the vehicle. Phenomena occurring in the area of contact between the ground and tyre are crucial to maintain directional stability and the ability to transfer driving forces. Changes in pressure and tire load affects the geometry of the contact area and lead to changes in the coefficient of adhesion. This paper presents results of research and discusses effect of pressure and vehicle axle radial load on the geometric features of the contact zone.

4

Internal pressure as a function of pressure for alkanols

Zorębski E.

Molecular and Quantum Acoustics

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2007

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Vol. 28

319-327

EN

Internal pressure as a function of pressure was estimated from the literature data for five chosen alkanols (ethanol, 1-pentanol, 3-pentanol, 3-methyl-3-pentanol, and 3-ethyl-3-pentanol). The data on isothermal compressibility and isobaric coefficient of thermal expansion obtained from acoustic method were used. The results shown that internal pressure can reaches a maximum for moderate pressures and then decreases more and more rapidly.

5

Internal Pressure as a Function of Pressure

Zorębski E.

Molecular and Quantum Acoustics

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2006

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Vol. 27

327-336

EN

Internal pressure as a function of pressure was estimated from literature data. Mostly, the data on isothermal compressibility and isobaric coefficient of thermal expansion obtained from acoustic method were used. The results shown that internal pressure can reaches a maximum for moderate pressures and then decreases more and more rapidly.

6

Remarks on the phase diagram of high-temperature superconductors: pressure dependence

Stankowski J., Krupski M., Micnas R.

Materials Science Poland

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2004

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Vol. 22, No. 3

175--185

EN

The Tc(x) dependence of high-temperature superconductors shows that superconductivity occurs above a critical concentration x1. For concentrations exceeding x1, Tc increases until an optimal concentration xopt is reached and drops with further increase of x. Above xopt, i.e., in the overdoped region, there exists a single Tc which can be taken as the temperature of the Cooper pair formation and, simultaneously, of their condensation (BEC) to the superconducting state. For carrier concentrations below the optimal value, x < xopt, there are two characteristic temperatures, > Tc. At T*, phase incoherent local pairs (LP's) are formed and only at Tc the system undergoes the superconducting phase transition. The existence of these two characteristic temperatures, T* and Tc, reflects various phenomena related to strong electron correlations. We review the pressure effects in the cuprate family YBCO and propose their explanation within the Hubbard model and crossover from BCS cooperative pairing to Bose-Einstein of preformed pairs. The scaling of the pressure effects above and below xopt is analyzed in terms of two parameters: the transfer integral t and on-site energy U. With increasing pressure, t increases and the density of states at the Fermi level decreases. Above xopt, Tc ?1/2zt and dTc/dp < 0. Below xopt, however, the derivative dTc/dp > 0, since Tc ?t2/U.

7

Ocena efektu umocnienia uzyskiwanego w wyniku oddziaływania ciśnienia na krzepnący odlew

Wierzbicka B.

Krzepnięcie Metali i Stopów

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2000

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R. 2, nr 43

525--530

PL

Badania przeprowadzono dla dwuskładnikowych stopów Cu-Zn. Materiał badawczy stanowiły odlewy grawitacyjne i krzepnące pod ciśnieniem 170 MPa, zarówno surowe, jak i poddane zabiegowi wyżarzania. Celem oceny efektu umocnienia przeprowadzono badania mikrostruktury (rozdrobnienie ziarna, zawartość fazy β', mikrotwardość fazy α) oraz struktury dyslokacyjnej.