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Wyświetlanie 1-15 z 97
Tytuł:
A simple model for predicting the free energy of binding between anthracycline antibiotics and DNA.
Autorzy:
Rudnicki, Witold
Kurzepa, Małgorzata
Szczepanik, Teresa
Priebe, Waldemar
Lesyng, Bogdan
Powiązania:
https://bibliotekanauki.pl/articles/1044384.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
anthracyclines
free energy
modelling
DNA
Opis:
A theoretical model for predicting the free energy of binding between anthracycline antibiotics and DNA was developed using the electron density functional (DFT) and molecular mechanics (MM) methods. Partial DFT-ESP charges were used in calculating the MM binding energies for complexes formed between anthracycline antibiotics and oligodeoxynucleotides. These energies were then compared with experimental binding free energies. The good correlation between the experimental and theoretical energies allowed us to propose a model for predicting the binding free energy for derivatives of anthracycline antibiotics and for quickly screening new anthracycline derivatives.
Źródło:
Acta Biochimica Polonica; 2000, 47, 1; 1-9
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accelerator Infrastructure in Europe EuCARD 2011
Autorzy:
Romaniuk, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/226312.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electronics and photonics for high energy physics experiments
free electron laser
distributed measurement and control systems
precise timing distribution systems of large space extent
advanced electronic systems
integration of hardware and software
Opis:
The paper presents a digest of the research results in the domain of accelerator science and technology in Europe, shown during the annual meeting of the EuCARD - European Coordination of Accelerator Research and Development. The conference concerns building of the research infrastructure, including in this advanced photonic and electronic systems for servicing large high energy physics experiments. There are debated a few basic groups of such systems like: measurement - control networks of large geometrical extent, multichannel systems for large amounts of metrological data acquisition, precision photonic networks of reference time, frequency and phase distribution.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 3; 413-419
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accelerator Science and Technology in Europe EuCARD 2012
Autorzy:
Romaniuk, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/226418.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electronics and photonics for high energy physics experiments
free electron laser
advanced electronic systems
integration of hardware and software
nuclear electronics
Opis:
Accelerator science and technology is one of a key enablers of the developments in the particle physics, photon physics, electronics and photonics, also applications in medicine and industry. The paper presents a digest of the research results in accelerators in Europe, shown during the third annual meeting of the EuCARD - European Coordination of Accelerator Research and Development. EuCARD concerns building of research infrastructure, including advanced photonic and electronic systems for servicing large high energy physics experiments. There are debated a few basic groups of such systems like: measurement - control networks of large extent, multichannel systems for metrological data acquisition, precision photonic networks for reference time distribution.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 4; 327-334
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption behavior of surfactants on lignite particles with different densities in aqueous medium
Autorzy:
Wang, J.
He, Y.
Wen, B.
Ling, X.
Xie, W.
Wang, S.
Powiązania:
https://bibliotekanauki.pl/articles/110538.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
interfacial surface free energy
adsorption
lignite
surfactant
Washburn equation
Opis:
Lignite is well known for its strong hydrophilicity and hard-to-float properties. However, the surface free energy of the solid is made up of two components, that is the Lifshitz-van der Waals and acid-base interaction energy. Differences in these two components between the low ash (lower density) and high ash fraction (higher density) provide a benefit for improving the separation efficiency through introducing surfactants in flotation. In this paper, thermodynamic characterization of three density lignite fractions was measured by a Washburn dynamic method. Combining the Washburn equation and Van Oss-Chaudhury-Good theory, the surface free energy components of three samples were calculated according to the wetting process by n-hexane, diiodomethane, deionized water and ethylene glycol. The Lifshitz-van der Waals part of surface free energy reduced with the coal density increase, especially between fractions of -1.45 g/cm3 and 1.45-1.80 g/cm3, while the Lewis base part increased slightly. The interfacial interaction free energies between the surfactant and lignite in aqueous medium indicated that the low hydrophilic index benefited for the stronger adsorption intensity. Increase of the surfactant Lifshitz-van der Waals component increases the adsorptive intensity on lower density lignite and the repulsive intensity on higher density lignite, which is beneficial for separation.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 996-1008
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption of sodium/calcium poly(acrylic acid) salts on anatase: effect of the polyelectrolyte molecular weight and neutralization
Autorzy:
Jacquemet, Christian
Powiązania:
https://bibliotekanauki.pl/articles/1449765.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adsorption
free energy
Langmuir isotherm
sodium-calcium poly(acrylic acid) salts
anatase
Opis:
Abstract: Interactions of poly(acrylic acid)s (PAAs) of two different molecular weights (Mw = 9,560 g×$mol^{-1}$ and 4,220 g×$mol^{-1}$) with surfaces of an untreated anatase $TiO_2$ were assessed through adsorption isotherm measurements. Those dispersants were tested under different sodium-calcium neutralization states (molar ratio $r = Ca^{2+}$ / $CO_{2-}$ varying from 0 to 0.35). Their behavior towards the $TiO_2$ surfaces can be described by the Langmuir adsorption model. For both polymers, surface coverage ($Γ_max$) evolves linearly with the molar ratio $r$. For a given r value, a lower surface coverage was observed with the polymer having the highest molecular weight. The free energy of adsorption ($/DeltaG_{ads}$) of PAAs was estimated from adsorption experiment data. This calculation indicates that sorption occurs spontaneously and is unlikely to be of chemical nature. The absolute values of $/DeltaG_{ads}$ are higher for the highest molecular weight polymers suggesting that they are more strongly adsorbed to anatase surfaces. The absolute values of $/DeltaG_{ads}$ per mole of sodium-calcium macromolecules are found to be lower than those calculated for their homologues 100% sodium neutralized suggesting that they are bound with the solid by a fewer number of segments.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 1; 113-123
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of oxygen binding by hemoglobin on the basis of mean intrinsic thermodynamic quantities
Autorzy:
Bordbar, Abdol-Khalegh
Mousavi, Sayed
Dazhampanah, Hamid
Powiązania:
https://bibliotekanauki.pl/articles/1041216.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
cooperativity
mean intrinsic Gibbs free energy
linkage phenomena
hemoglobin
Opis:
The binding data for oxygenation of human hemoglobin, Hb, at various temperatures and in the absence and presence of 2,3-diphosphoglycerate, DPG, and inositol hexakis phosphate, IHP, were analyzed for extraction of mean intrinsic Gibbs free energy, ΔGo, enthalpy, ΔHo, and entropy, ΔSo, of binding at various partial oxygen pressures. This method of analysis considers all the protein species present such as dimer and tetramer forms which were not considered by Imai et al. (Imai K et al., 1970, Biochim Biophys Acta 200: 189 - 196) , in their analysis which was based on Adair equation. In this regard, the values of Hill equation parameters were estimated with high precision at all points of the binding curve and used for calculation of ΔGo, ΔHo and ΔSo were also calculated by analysis of ΔGo values at various temperatures using van't Hoff equation. The results represent the enthalpic nature of the cooperativity in Hb oxygenation and the compensation effect of intrinsic entropy. The interpretation of results also to be, into account the decrease of the binding affinity of sites for oxygen in the presence of DPG and IHP without any considerable changes in the site - site interaction (extent of cooperativity). In other words, the interactions between bound ligands, organic phosphates and oxygen, are more due to a decreasing binding affinity and not to the reduction of the cooperative interaction between sites. The results also document the more heterotropic effect of IHP compared to DPG.
Źródło:
Acta Biochimica Polonica; 2006, 53, 3; 563-568
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Ozonation Process for Shaping the Energy Properties of the Surface Layer of Polymer Construction Materials
Autorzy:
Kłonica, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/2027827.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
surface layer
ozone
polymer material
surface free energy
Opis:
The properties of the surface layer of construction materials are very important for making adhesive bonds. The article presents the test results for surface free energy in PA6 polyamide subjected to surface layer modification using the ozonation process. To develop the surface geometrically, the samples were subjected to mechanical processing. The comparison of results demonstrated that ozonation is an efficient and eco-friendly method of modifying the surface layer. The article also presents the comparison results for measurements of selected surface roughness parameters.
Źródło:
Journal of Ecological Engineering; 2022, 23, 2; 212-219
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania właściwości adhezyjnych stali oraz tworzyw sztucznych w kontekście zastosowania ich na węzły tarcia
Research of the adhesion of steel and plastics in the context of their application in frictional couples
Autorzy:
Paszkowski, M.
Wieleba, W.
Wróblewski, R.
Powiązania:
https://bibliotekanauki.pl/articles/188849.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
swobodna energia powierzchniowa
adhezja
tarcie statyczne
free surface energy
adhesion
static friction
Opis:
W pracy przedstawiono badania właściwości adhezyjnych stali i polimerów w kontekście zastosowania ich na węzły tarcia. Najpowszechniejszą metodą oceny właściwości adhezyjnych ciał stałych jest pomiar kąta zwilżania. Pomiar kąta zwilżania został użyty do wyznaczenia swobodnej energii powierzchniowej stali i polimerów oraz pracy adhezji dla skojarzeń stal–polimer. Badaniom poddano polietylen o ultrawysokim ciężarze cząsteczkowym, polieteroeteroketon, polioksymetylen, politetrafluoroetylen oraz stal austenityczną 316L i stal C45 o różnej twardości. Analiza wyników badań ukazała silną zależność między pracą adhezji a współczynnikiem tarcia statycznego oraz brak wpływu twardości stali na jej swobodną energię powierzchniową.
The paper deals with adhesion properties of steels and polymers in the context of their application in frictional couples. A general method for a qualitative estimate of the adhesive properties of solids is wetting angle measurement. The wetting angle measurements were used to determine the free surface energy for steels and polymers and the work of adhesion for steel-polymer combinations. The research was done on UHMW polyethylene, polyether ether ketone, polyoxymethylene, polytetrafluoroethylene, 316L austenitic steel and C45 steels in four different hardnesses. The results of the experiment showed a great correlation between the work of adhesion and the static friction coefficient and had no influence on the hardness of steel on free surface energy in the steel-polymer material combinations. The research was carried out by means of a goniometer – DSA-HT12.
Źródło:
Tribologia; 2010, 5; 95-104
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bench tests results analysis of the engines modelled elements
Analiza wyników stanowiskowych badań modelowych elementów silników spalinowych
Autorzy:
Kaźmierczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/133299.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
combustion engine
wear
surface free energy
SFE
friction
silnik spalinowy
zużycie
swobodna energia powierzchniowa
tarcie
Opis:
This paper presents an analysis of the bench tests results of an internal combustion engines modelled elements. The investigated samples was made through the technology used to manufacture the cylinder and piston rings. The original materials and coatings were retained. The aim of this research was to determine the influence of employed coatings on friction and friction pairs wear resistant in an internal combustion engines. The emphasis was given here on the variant investigation in which the counterface was made of nitrided cast iron or was not subjected to this process.
W artykule przedstawiono analizę wyników stanowiskowych badań modelowych elementów silników spalinowych. Badaniom poddano próbki wykonane z użyciem technologii stosowanych do wykonywania cylindrów oraz pierścieni tłokowych. Zachowano oryginalne materiały oraz powłoki. Celem badań było określenie wpływu powłok przeciwzużyciowych na tarcie i zużycie par trących stosowanych w silnikach spalinowych. Badania przeprowadzono wariantowo z zastosowaniem przeciw próbek żeliwnych azotowanych i nie poddanych procesowi azotowania.
Źródło:
Combustion Engines; 2013, 52, 3; 843-848
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conformational Ensemble of B Chain in $T_{6}$ Human Insulin Based on the Landau Free Energy
Autorzy:
Lei, Yanlin
He, Jianfeng
Liu, Jiaojiao
Li, Jing
Powiązania:
https://bibliotekanauki.pl/articles/1398189.pdf
Data publikacji:
2018-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
insulin
structural flexibility
free energy
conformational ensemble
Opis:
Insulin is an important peptide hormone for the glucose metabolism. The structural flexibility of insulin B chain attracts a lot of our attention for understanding the biological activity. Our work carried out the extensive sampling to statistically clarify the structural changes of isolated $T_{6}$ human insulin B chain. We introduced the Landau free energy to describe the isolated insulin B chain whose experimental structure locates a local energy minimum. Its trained model was subjected to thousands of heating and cooling circles between the high and low temperatures. Six typical structure clusters were found by classifying the final generated structures with RMSD and radius of gyration. The structures in clusters indicate the potential deformations of insulin B chain at residues 5-8 of N-terminus, residues 9-12 of central helix and residues 24-29 of C-terminus, which agrees with the experimental results.
Źródło:
Acta Physica Polonica A; 2018, 133, 5; 1261-1265
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contact angle and surface free energy of fresh and stored pig’s skin
Autorzy:
Liber-Kneć, A.
Łagan, S.
Powiązania:
https://bibliotekanauki.pl/articles/285482.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
skin tissue
surface free energy
biomaterials
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 10
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of glass surface wettability via esterification with n-alkyl alcohols
Autorzy:
Kruszelnicki, Mateusz
Polowczyk, Izabela
Kowalczuk, Przemyslaw B.
Powiązania:
https://bibliotekanauki.pl/articles/2146948.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydrophobicity
surface free energy
contact angle
zeta potential
roughness
Opis:
Surface wettability plays an essential role in many processes and materials applications. It depends mainly on the surface roughness and chemical composition, thus through a controlled modification of these parameters, the wettability can be restrained. Glass is an inorganic solid material, composed mainly of amorphous silica, which surface, due to the presence of reactive hydroxyl groups, can be quite easily chemically modified. This feature can be used to control the wettability of glass by reaction with organic compounds. In this study, the esterification of glass silanol groups with n-alkyl alcohols (Cn/H2n+1/OH, n=3, 4, 6, 8, 10) was employed to modify its wettability. The effect of such modification on the physicochemical properties of glass surface was comprehensively investigated and characterised by the water contact angle, surface free energy, zeta potential, atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) measurements. We demonstrate that the wettability of the esterified glass surface is strongly dependent on both the chain length of used alcohol and modification time. The alcohol molecule binds to the glass surface through a Si-O-C bond, leading to the formation of a monolayer that does not significantly affect the surface morphology and zeta potential. Conducted studies provided a broader view of the influence of this technique for modifying surface wettability on its physicochemical properties.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 2; art. no. 145147
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of mechanical ventilation systems - efficient use of energy
Projektowanie systemów wentylacji mechanicznej - efektywne wykorzystanie energii
Autorzy:
Goreczny, T.
Powiązania:
https://bibliotekanauki.pl/articles/402110.pdf
Data publikacji:
2012
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
efficient use of energy
mechanical ventilation
energy consumption
free cooling
efektywne wykorzystanie energii
wentylacja mechaniczna
zużycie energii
Opis:
The paper presents the possibility of using energy-efficient technologies, namel y free cooling and mechanical ventilation system operation with variable stream of fresh air used in order to meet the requirements of energy efficiency. Analysis of energy consumption of ventilation air treatment processes compared the theoretical/designed energy consumption of real energy needs. For this purpose, energy consumption for heating and cooling processes for one unit m3/h of fresh air was determined.
Źródło:
Structure and Environment; 2012, 4, 1; 31-36
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does Physics Forbid Libertarian Freedom?
Autorzy:
Koperski, Jeffrey
Powiązania:
https://bibliotekanauki.pl/articles/2083941.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Instytut Filozofii
Tematy:
libertarianism
free will
conservation of energy
dualism
emergentism
Opis:
Three well-known physicists have recently argued that libertarian freedom is impossible. In their view, free will is incompatible with what we know about science at the most fundamental level. Here I show that their arguments presuppose a naïve version of reductionism and consider two alternatives, one appealing to mind–body dualism and the other to emergentism. The former says that free will is a capacity of one’s mind, an immaterial entity not subject to the laws of nature. The latter says that free will is an emergent capacity that cannot be reduced to the properties of an agent’s constitutive atoms. These alternatives, however, face the same problem: They seem to violate a fundamental law, namely the conservation of energy. I show how the libertarian can respond to this objection.
Źródło:
Filozoficzne Aspekty Genezy; 2022, 19, 1; 111-132
2299-0356
Pojawia się w:
Filozoficzne Aspekty Genezy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efektywność produkcji mleka w oborach różnej wielkości i systemach utrzymania krów
Effectiveness of milk production in the cowsheds of different size and animal keeping systems
Autorzy:
Fiedorowicz, G.
Powiązania:
https://bibliotekanauki.pl/articles/239766.pdf
Data publikacji:
2006
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
ferma
obora stanowiskowa
obora wolnostanowiskowa
efektywność energetyczna
nakłady energii eksploatacyjnej
cattle farm
tying-stall cowsheds
free-stall cowsheds
energetic efficiency
energy inputs
Opis:
Stwierdzono wyższą efektywność energetyczno-eksploatacyjną obór wolnostanowiskowych w porównaniu ze stanowiskowymi w oparciu o analizę ekonomiczną. Do analizy przyjęto dane z przebadanych 11 ferm wolnostanowiskowych, 11 obór dużych i 17 obór małych oraz 5 obór małych wolnostanowiskowych. Efektywność określono według wskaźnika efektywności energetycznej eksploatacyjnej H(e), który wynosi: dla ferm - 0,580, dla obór wolnostanowiskowych - 0,582 i dla obór stanowiskowych -0,402. Stwierdzono wyższą efektywność wyrażoną m.in. niższymi nakładami energii na robociznę.
On the basis of economic analysis the higher energetic and exploitation effectiveness of the free-stall cowsheds was stated in comparison to the tying-stall cowsheds. The survey covered 11 large and 5 small free-stall cowsheds as well as 11 large and 5 small tying-stall cowsheds. The effectiveness was determined according to energetic and exploitation indices H(e), which amounted 0.580 for large and 0.582 for small free-stall cowsheds, and 0.402 for the tying-stall cowsheds. Higher effectiveness consisted in lower energy inputs on the labour.
Źródło:
Problemy Inżynierii Rolniczej; 2006, R. 14, nr 4, 4; 39-44
1231-0093
Pojawia się w:
Problemy Inżynierii Rolniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 97

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