Wyniki wyszukiwania - Biblioteka Nauki

1

Membrany ciekłe jako efektywna metoda wydzielania, rozdziału i oczyszczania mieszanin

100%

Wieczorek P. P.

Przemysł Chemiczny

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2007

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tom T. 86, nr 10

996-1000

2

Effect of increasing doses of mushroom substrate on the root mass of selected lawn mixtures

100%

Wiśniewska-Kadżajan B.

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tom Vol. 14, nr 4

39--44

EN

To fertilize both grassland and turf lawns waste materials, including the substrate after mushroom cultivation have been used recently. The aim of this study was to determine the effect of the mushrooms substrate to change the amount of root mass of five turf lawns with varying precipitation of perennial ryegrass. Field experiment was established in 2004 in the agricultural station of University of Natural Science and Humanities in Siedlce. In the research, the following factors were used: 1) dose of mushroom substrate, 2) the mixtures lawns with different species composition and participation of perennial ryegrass. Within two years of research the evaluation of the amount of root mass of turf lawns were done. This assessment was made after plants’ vegetation in 2005 and 2006. The roots sampling of lawns were taken. After cleaning of the root and drying at 1050C, the mass was determined by weighing. The largest mass of roots (average from the study years and substrate doses) was observed for the two-component mixture (M1) with 80% share of perennial ryegrass, and the smallest for five-component mixture (M5), where the share of perennial ryegrass was 40%. The average for research years of and mixtures type, indicates that most of the root mass formed the turf lawns with the largest mushroom substrate doses, but at least on the control object. The majority of the tested lawn mixtures, with the exception of mixture five (M5) produced a greater mass of roots in the second year (2006) than in the first (2005) year, despite worse weather conditions.

3

CO2-CH4 mixtures phase equilibrium analysis

100%

Dorosz P. , Kopczyński A. , Wojcieszak P.

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2017

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tom T. 4

89--97

EN

Carbon dioxide removal is crucial step during natural gas processing, as CO2 is highly corrosive in presence of water. There are natural gas sources around the world with very high carbon dioxide content that cannot be developed. In order to design the effective CO2 removal process, properties of methane-carbon dioxide mixtures has to be determined. Authors have investigated thermodynamic properties of CH4-CO2 mixtures. Extended Peng-Robinson equations were used to determine the phase equilibrium of CH4-CO2 systems of different compositions.

4

Lattice Cluster Theory for Copolymer Blends : General Theory in the Incompressible System, Long Chain Limit

88%

Dudowicz J. , Freed K. F.

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2001

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tom Vol. 75, nr 4

527-545

EN

The lattice cluster theory is developed for binary blends of two structured monomer copolymers in the simplifying limit of an incompressible system and high molecular weights. The major advance in the present theory is the inclusion of nonrandom mixing effects that lead to a monomer sequence dependence of the Helmholtz free energy without the introduction of new adjustable parameters beyond those present in descriptions of binary homopolymer blends formed from the constituent monomers. Equivalently, the sequence dependent contributions are shown to emerge from a proper determination of the "surface fractions" in individual copolymer chains. The general theory applies to blends of random copolymer, diblock copolymers, alternating copolymers, as well as of copolymers with kinetically controlled monomer sequences. The theory is illustrated for purely random copolymer blends of deuterated and hydrogenated polybutadienes, where the computed phase boundaries depart qualitatively from those predicted by random copolymer Flory-Huggins theory.

5

The possibility of the SI engine CO2 emission reduction with the application of CNG-hydrogen blends

88%

Flekiewicz M. , Kubica G. , Flekiewicz B.

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tom Vol. 15, No. 3

139-146

EN

The influence of hydrogen-methane blends application in SI engines on their CO2 emission is the main goal of this paper. The 1.6 litre engine alternatively fed with either petrol, CNG and with methane-hydrogen blends has been tested in the research program. The possibility of passenger car engine operation on H2-CH4 mixtures has been demonstrated in the paper, with the underlining of the potential of those mixtures in the increasing of the engine efficiency. Necessary changes in strategy of engine regulation, especially in air/fuel ratio, ignition advance and EGR rate, were noticed and prepared. The methane-hydrogen blends, which were used in the research programme featured ratios as follows: 5%, 10% and 15% of hydrogen. For selected engine operating points, following data has been acquired: in cylinder pressure variation, crank angle, manifold pressure and finally mass fuel consumption. On the basis of registered data for all fuels - burned temperature in cylinder has been estimated, as well as the charge combustion ratio, and the heat release rate. With help of mathematical model describing the exhaust gases formation it has been possible to estimate the NO, CO and CO2 emission level. Obtained results made it possible to compare the combustion process for all tested fuels and pointed on the significant influence of hydrogen percentage for the methane-hydrogen blends, on the CO2 emission reduction up to 20%. Negative aspects of chosen blends application have been also describe in the paper, especially of increasing engine thermal load.

6

O termodyfuzji w polu elektrycznym

75%

Jędrzejczyk-Kubik J.

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tom z. 6

41--45

EN

An n-th component mixture placed in electric field is analysed. It is assumed that there exists a component which has a much greater density than those of the other components. Such an assumption validates the determination of the thermodiffusion equations in the electric field. In the final step, the constitutive equations for viscoelastic thermodiffusion concerning the electric field are formulated.

7

On the exponential decay for viscoelastic mixtures

75%

Passarella F. , Zampoli V.

Archives of Mechanics

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2007

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tom Vol. 59, nr 2

97-117

EN

This paper concerns the study of mixtures composed of a thermoelastic solid and a viscous fluid. For these mixtures, the dissipation effects are connected with the viscosity rate of one constituent and with the relative velocity vector. Using the time-weighted surface power method, associated with the linear process, we obtain some spatial decay estimates, characterized by time-independent and time-dependent decay rates, respectively. The first type of estimate is appropriate for large values of time, while the other is useful for short values of the same variable.

8

Ultrasonic study of molecular interaction in binary liquid mixtures of n-hexane with alcohols

63%

Santhi N. , Sabarathinam P. , Alamelumangai G. , Madhumitha J. , Emayavaramban M.

International Letters of Chemistry, Physics and Astronomy

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2012

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tom Vol. 5

59-71

EN

Ultrasonic velocity, viscosity and density of alcohol[s] in n-hexane have been measured AT various temperatures in the range of 303.15 - 318.15K. From the experimental data, the acoustical parameters such as molar volume, adiabatic compressibility, intermolecular free length and their excess values have been computed and presented as functions of compositions. The deviations from ideality of the acoustical parameters are explained on the basis of molecular interactions between the components of the mixtures. The variations of these parameters with composition of the mixture suggest the strength of interactions in these mixtures.

9

Badanie ciepła spalania mieszanin biomasy z węglem

63%

Błogowska K. , Wójcik P.

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2007

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tom T. 1, z. 25

99-103

PL

Celem polityki energetycznej Unii Europejskiej jest osiągnięcie 20% energii ze źródeł odnawialnych do 2020 r. Ze wszystkich rodzajów energii odnawialnej znaczący udział w polskiej energetyce może mieć jedynie spalanie biomasy i biogazu. Prezentowany artykuł dotyczy badań eksperymentalnych mieszanin biomasy, której zastosowanie jest w dużej mierze zależne od ciepła spalania i wartości opałowej proponowanego paliwa. Przedstawiono wartości ciepła spalania uzyskane drogą eksperymentalną dla mieszanin biomasy odpadowej z węglem oraz porównano je z analogicznymi wartościami dla węgla i innych rodzajów biomasy. Uzyskane rezultaty mogą dać pojęcie o opłacalności stosowania biomasy jako dodatku do węgla tam, gdzie dostęp do niej jest łatwy i często darmowy. W pracy przedstawiono również problemy jakie może powodować stosowanie mieszanin zawierających biomasę jako paliwo.

EN

The goal of energetic politics of EU is achieving 20% of energy from reneveble sources in 2020.fn Poland the only renevable source of energy, that can be used to the large scale is biomass and biogas. In this article the heats of combustion of biomass and some mixtures of biomass and coal were presented. Measured values of heats of combustion of biomass give us in some cases about 50% of coal heat of combustion, and it can answer the quesrion of profitability of using tose fuels and its meltings. Some problems we can observe with changing of water concentration in biomass, because of changing heat of combustion and temperature of combustion.

10

Wbudowywanie gorących mieszanek mineralno-asfaltowych na obiektach mostowych z izolacją z pap termozgrzewalnych z uwzględnieniem procesu przepływu ciepła

63%

Mieczkowski P.

Drogownictwo

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2008

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tom nr 10

343-353

PL

Przy układaniu gorących mieszanek asfaltowych na papę izolacyjna ujawniają się błędy układania papy. W szczególności zamknięte pod papą powietrze i woda powodują odrywanie i deformowanie papy. Asfalt lany powoduje większe negatywne skutki niż beton asfaltowy. Skuteczne jest tylko dokładne wysuszenie i wyczyszczenie powierzchni betonowej przed ułożeniem papy.

EN

During laying of hot asphalt mixture on insulation felt, mistakes of felt laying are exposing. In particular, air and water closed under the felt cause coming off an deformation of the felt. Mastic asphalt gives higher negative effects than concrete asphalt. Only careful drying and cleaning of the concrete before felt laying are effective.

11

Ciecze i mieszaniny do wypełniania likwidowanych odwiertów

63%

Uliasz M. , Rzepka M.

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2013

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tom R. 16, Nr 2 (178)

8--15

PL

W artykule przedstawiono, w oparciu o wyniki badań laboratoryjnych, wymagania i właściwości technologiczne cieczy i mieszanin do wypełniania likwidowanych odwiertów znajdujących się na sczerpanych złożach gazu ziemnego i ropy naftowej. Do badań laboratoryjnych nad opracowaniem ich składów zastosowano materiały płuczkowe i wiążące, środki chemiczne, a także zużyte płuczki wiertnicze. Dobór składu oraz właściwości cieczy i mieszanin ustalono dla warunków geologiczno-złożowych występujących w odwiertach znajdujących się na obszarze przedgórza Karpat. Opracowane ciecze i mieszaniny z powodzeniem mogą być stosowane w warunkach przemysłowych efektywnie izolując przewiercone poziomy wodonośne i roponośne.

EN

Requirements and technological properties of liquids and mixtures for filling abandoned wells, in depleted oil and gas reservoirs are presented in this publication. For laboratory evaluation of tested compositions the mud materials, binding materials, chemical agents and used drilling muds were used. The selection of composition and properties of liquids and mixtures was adjusted for geologic and reservoir conditions existing in wells drilled in the area of Polish Carpathian Foreland. Liquids and mixtures developed, may be successfully used in field conditions, effectively isolating drilled water and oil bearing strata.

12

Theoretical Evaluation of Ultrasonic Velocity in Binary Liquid Mixtures of Alcohols [S] + Benzene

63%

Santhi N. , Sabarathinam P. L. , Madhumitha J. , Alamelumangai G. , Emayavaramban M.

International Letters of Chemistry, Physics and Astronomy

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2013

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tom Vol. 2

18-35

EN

Ultrasonic velocities and densities of the binary liquid mixtures of benzene with 1-propanol, 2-propanol, 1-butanol, 2-butanol and 3-butanol at 303.15 to 318.15 K, over the entire composition range were measured. The theoretical values of ultrasonic velocity were evaluated using the Nomoto’s Relation (NR), Ideal Mixture Relation (IMR), Free Length Theory (FLT) and Collision Factor Theory (CFT). The validity of these relations and theories were tested by comparing the computed sound velocities with experimental values. Further, the molecular interaction parameter (á) was computed by using the experimental and the theoretical ultrasonic velocity values. The variation of this parameter with composition of the mixtures has been discussed in terms of molecular interaction in these mixtures.

13

Wpływ wybranych czynników agrotechnicznych na plonowanie i budowę przestrzenną łanu mieszanki zbożowej

51%

Leszczyńska D.

Journal of Research and Applications in Agricultural Engineering

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2012

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tom Vol. 57, nr 4

30-34

PL

Ziarno trójskładnikowej mieszanki zbożowej charakteryzuje się dobrą jakością paszową i moze być stosowane w żywieniu zwierząt w gospodarstwach ekologicznych. Celem przeprowadzonych badań było określenie reakcji mieszanki trójskładnikowej o różnym udziale komponentów, na termin siewu i ilość wysiewu w warunkach uprawy na glebie kompleksu żytniego bardzo dobrego oraz kompleksu żytniego dobrego. Mieszanka z przewagą jęczmienia okazała się plenniejsza od mieszanki z większym udziałem owsa, niezależnie od warunków glebowych i terminu siewu. Opóźnienie siewu spowodowało spadek poziomu plonowania wszystkich wariantów mieszanki. Budowa łanu mieszanki zależała od udziału gatunków zbóż oraz od terminu siewu. Na glebach kompleksów żytniego bardzo dobrego i żytniego dobrego mozna zalecać uprawę dwu wariantów mieszanki trójskładnikowej, tj. o składzie komponentów: jęczmień - owies - pszenica w stosunku 2:1:1 lub 1:1:1 w materiale siewnym.

EN

The grain of the three-cereal mixture makes good quality and can be used in animal feeds in organic farming. The aim of The study was to determine effects of seeding rate and seeding date on the yield of the three - cereals mixture (at different participation of components). The experiment was located in very good rye and good rye soil suitability complexes. The highest yield gave the mixture with the highest participation of barley (50% barley + 25% oat + 25% wheat) in seeding lot. Delaying of the seeding date decreased grain yield of mixtures. Architecture of canopy mixture depended on participation of species and seeding date. The barley-oat-wheat mixture can be recommended to cultivation on the very good rye and good rye complexes. The best proportions of individual components in seed lot are 2:1:1 and 1:1:1.