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排序方式: 共有103条查询结果,搜索用时 15 毫秒
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Hrvoje Mikulčić Jiři Jaromír Klemeš Neven Duić 《Clean Technologies and Environmental Policy》2016,18(6):1633-1639
Due to increased environmental awareness and social responsibility, social and human welfare have been increasingly viewed through the prism of sustainable development. As sustainable development is a highly multi-disciplinary field of research, a considerable number of studies have been devoted to this issue. The studies show that sustainable development has become an urgent task for the international community, academia, industry experts, policy makers and the general public, due to the rapidly growing social challenges of mankind. This review article provides a short assessment of the current state-of-the art papers related to sustainable development covered in the recent publications mostly originated from previous SDEWES conferences. 相似文献
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Dušan Kopecký Martin Vrňata Filip Vysloužil Přemysl Fitl Ondřej Ekrt Jaromír Seidl Vladimír Myslík Jaroslav Hofmann Josef Náhlík Jan Vlček Lukáš Kučera 《Synthetic Metals》2010,160(9-10):1081-1085
The contribution deals with synthesis and characterization of conductive polypyrrole (PPY), which should be suitable for depositions of thin layers by Matrix Assisted Pulsed Laser Evaporation (MAPLE) method. The samples of doped PPY containing various organic dopants – (i) p-toluenesulfonic acid, (ii) dodecyl-benzenesulfonic acid, (iii) dioctyl-sulfosuccinic acid and (iv) camphorsulfonic acid – were synthesized by polymerization of pyrrole in acidic or neutral solution. Solubility of synthesized PPY and settlement time of PPY particles in water and dimethylsulfoxide – parameters critical for MAPLE method – were investigated. The composition of prepared PPY was verified by FTIR spectroscopy. Conductivity of the polymer in solid state was determined to be in range from σ = 2.6 × 10?6 S cm?1 to σ = 6.0 × 10?2 S cm?1. The optimal material for MAPLE deposition is PPY containing organic dopants (ii)–(iv), dissolved in DMSO matrix (solubility from 4.1% to 6.5% by weight and settlement time 140–240 h). 相似文献
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The work deals with numerical modelling of turbulent flows in channels with an expansion of the cross-section where flow separation and reattachment occur. The performance of several eddy viscosity models and an explicit algebraic Reynolds stress model (EARSM) is studied. The used test cases are flows in channels with various backward facing steps where the step is perpendicular or inclined and the top wall is parallel or deflected. Furthermore, a channel with the circular ramp is considered. The numerical solution is achieved by the finite volume method or by the finite element method. The results of both numerical approaches are compared. 相似文献
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Václav Kočí Jiří Maděra Miloš Jerman Jaromír Žumár Dana Koňáková Monika Čáchová Eva Vejmelková Pavel Reiterman Robert Černý 《Clean Technologies and Environmental Policy》2016,18(6):1725-1733
A potential application of waste ceramic dust as cement replacement in lime-cement plasters is studied using both experimental and computational approaches. A comprehensive experimental analysis of the material properties of lime-cement plaster and three lime-pozzolan plasters containing different amounts of waste ceramics is performed at first. The results show that compressive strength of ceramics-containing plasters can be up to three times higher as compared with the lime-cement plaster but their thermal conductivity is higher as well. In the second part of the study, the hygrothermal and energy performance of a characteristic building envelope provided with the four analyzed plasters as surface layers is analyzed. The results of numerical simulations reveal that the application of waste ceramic dust in lime-pozzolan plasters does not have a negative effect on both the hygrothermal and energy performance of the building envelope, as compared with the use of lime-cement plaster. Taking into account the energy demand and environmental load related to cement production, the application of waste ceramic dust as a ready-to-use replacement of cement in lime-cement plasters represents the right step toward sustainable development. 相似文献
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Abstract Photon statistics and non-classical behaviour of forward and backward four-wave mixing are examined including the coupling of modes in the approximation of small fluctuations around a stationary point, which is analytically determined and conditions for its stability are obtained. The depletion of pump modes is involved and effects of nonlinear dynamics, non-classical behaviour of input radiation, external noise and losses are included. 相似文献
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Abstract Using the approximation of small fluctuations around a stationary point, photon statistics and squeezing of vacuum fluctuations are derived in stimulated Raman scattering including the coupling of photon-photon and photon-phonon modes. The depletion of pump light is described and it is shown that a regime of inversion of the process is related to an increase in quantum fluctuations, which are finally reduced again, more in the anti-Stokes mode than in the Stokes mode. If the anti-Stokes coupling is stronger than the Stokes coupling, then an oscillating behaviour of the statistical characteristics occurs and substantial squeezing can be found in photon-phonon modes. 相似文献