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Wyświetlanie 1-15 z 83
Tytuł:
Characterization of ferromagnetic composite materials for biomedical applications
Autorzy:
Fedotova, J.
Wójcik, M.
Powiązania:
https://bibliotekanauki.pl/articles/284640.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanokompozyty
nanocomposites
Opis:
The great technological development in materials engineering together with quantum mechanical effect called giant magnetoresistance (GMR) observed in thin film structures composed of alternating ferromagnetic and nonmagnetic metal layers have evolved to the point where their synergistic combination have culminated in a new field of multidisciplinary research and in new applications. Paper shows results of investigations of nanocomposites consisting of magnetic metallic (alloy) nanoparticles (MMNPs) embedded in a dielectric matrix (like SiO2 or Al2O3). The studied (Fe0.45Co0.45Zr0.10)x(Al2O3)100-x(17
Źródło:
Engineering of Biomaterials; 2007, 10, no. 69-72; 6-7
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations on using GPS/RTK technique in displacement surveys
Autorzy:
Wyczałek, I.
Wójcik, M.
Powiązania:
https://bibliotekanauki.pl/articles/225346.pdf
Data publikacji:
2009
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
GPS
RTK
nawigacja satelitarna
badania
satellite navigation
surveys
Opis:
The survey technique using satellite navigation methods have already reached such level, that it can be used not only for position determination at any place on earth but they have the quality which makes it possible to take actions at higher demands in regard to thc accuracy. Such field of potentlal implementation is displacement survey especially at vast areas where classic methods based on angles and distances don't guarantee sufficient accuracies of the results. In regard to increasing possibilities of RTK technique, some tests of its accuracy have been performed in different places, which showed the reality of reaching standard deviation in less than 1 cm. Such assessment encourages to attempt the use of this techniąue to ineasure displacements. As a part of this work the methods for obtaining accurate results with RTK technique have been reviewed, our own procedure for measuring and calculation has been developed and series of tests have been performed along with a study of their accuracy. Factors which affect the accuracy of the measurement time were examined among others, the number of reference stations approximations and observations filtering, and the differential adjustment. The conclusions provide prospects for achieving the accuracy of the measurement of horizontal displacements of large objects with the average error of 2-3 mm.
Źródło:
Reports on Geodesy; 2009, z. 2/87; 427-435
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ultrashort pulses supported by SESAM absorber
Autorzy:
Jasik, A.
Muszalski, J.
Gaca, J.
Wójcik, M.
Pierściński, K.
Powiązania:
https://bibliotekanauki.pl/articles/200639.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
DBR
SESAM
mode-locking
femtosecond pulses
Opis:
We have developed a mode-locked diode-pumped Yb:KYW laser generating nearly band-width limited pulses as short as 101 fs. At 1.1 W absorbed power and 3% transmission output coupler, the laser delivers 150 mW for pulse duration of 110 fs, what corresponds to an efficiency of 14%. It was achieved using semiconductor saturable absorber mirror (SESAM) grown by molecular beam epitaxy. SESAM contains a distributed Bragg reflector (DBR) completed by single quantum well (SQW) playing role of an absorbing layer. The absorbers were crystallized in accordance with the predicted structure parameters under optimised growth conditions. The resonant-like type of structures ensured relatively high enhancement factor due to antireflective properties of SiO2 capping material and a wavelength independence of a group delay dispersion. The optimisation of the growth conditions of both an absorbing layer and DBR structure were widely carried out. Optical reflectance and high resolution X-ray diffraction have been used for characterization and verification of DBR structures. It results in reduction of the nonsaturable absorption in SESAM and self-starting mode-locking of the ultrashort pulses.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 4; 477-483
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient use of energy in wastewater treatment plants
Autorzy:
Masłoń, A.
Wójcik, M.
Chmielowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/101760.pdf
Data publikacji:
2018
Wydawca:
Instytut Polityki Energetycznej im. Ignacego Łukasiewicza
Tematy:
wastewater treatment
energy intensity
energy consumption
biogas
aeration
Opis:
Saving energy and increasing energy efficiency constitutes a rationalisation of energy use, which is becoming increasingly important in the context of sustainable development and security of energy supply, as well as the fight against global climate change. In line with the global trend, the issue of energy intensity of water and wastewater management is currently dynamically developing in terms of research. Consideration is therefore being given to the use of electricity in wastewater treatment systems, as well as the assessment of the energy efficiency of wastewater treatment plants. This paper presents the issues of electricity consumption in wastewater treatment systems and the possibilities of improving the energy efficiency of wastewater treatment plants.
Źródło:
Energy Policy Studies; 2018, 1 (2); 12-26
2545-0859
Pojawia się w:
Energy Policy Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of a new technique to immobilize yeast cells in alginate capsules
Autorzy:
Wójcik, M.
Grubecki, I.
Trawczyńska, I.
Powiązania:
https://bibliotekanauki.pl/articles/347068.pdf
Data publikacji:
2013
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
immobilization
encapsulation
viscosity
alginate capsule
Opis:
A new technique for the encapsulation of yeast cells by elimination of any thickening agent has been evaluated. The proposed procedure is based on the application of a concentrated suspension of cells which already has the sufficient viscosity to obtain spherical capsules with a semipermeable membrane. Measurements have been conducted which show that, for suspensions with yeast cell concentrations higher than 20% dry weight, apparent viscosity depends not only on the yeast concentration, but also on shear rate. The influence of sodium alginate and calcium chloride concentrations on membrane thickness has also been studied.
Źródło:
Ars Separatoria Acta; 2012-2013, 9/10; 77-82
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the effective diffusivity of cadmium(II) in calcium alginate beads
Autorzy:
Kwiatkowska-Marks, S.
Wójcik, M.
Kopiński, L.
Powiązania:
https://bibliotekanauki.pl/articles/347047.pdf
Data publikacji:
2011
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
cadmium ions
alginate beads
effective diffusivity
Opis:
Effective diffusivity (De) of cadmium compounds was calculated in the beads. The study was carried out using two methods: a shrinking core model (SCM) method and a newly developed method named conductometric. It turned out to be a simple and effective method for the calculation of effective diffusivity of Cd(II) in alginate sorbents. The De values obtained by the two methods depended on the alginate content in the beads. However, SCM, in contrast to the conductometric method, gave De values increasing with increasing alginate levels in the beads and lower than the molecular diffusivity of Cd(II), this being inconsistent with the mechanism of diffusion in porous carriers. Hence, the conductometric method can be considered as one giving more reliable results, compared with the SCM method. Moreover, diffusion retardation coefficients for the alginate beads were calculated. Enhanced content of the biopolymer in the beads caused retardation of Cd(II) diffusion in the beads due to the decreasing calculated retardation coefficients with the increasing alginate contents in the beads.
Źródło:
Ars Separatoria Acta; 2011, 8; 11-23
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Response Surface Methodology for Optimization of Permeabilization Process of Baker’s Yeast
Autorzy:
Trawczyńska, I.
Wójcik, M.
Powiązania:
https://bibliotekanauki.pl/articles/778342.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
permeabilization
baker's yeast
response surface methodology
isopropyl alcohol
Opis:
Permeabilization was used for the purpose of transforming the cells of microorganisms into biocatalysts with an enhanced enzyme activity. Baker’s yeast cells were permeabilized with various organic solvents. A high degree of catalase activity was observed upon permeabilization with acetone, chloroform, isopropyl alcohol and ethyl acetate. Response surface methodology was used to model the effect of concentration of isopropyl alcohol, temperature and treatment time on the permeabilization of baker’s yeast cells to maximize the decomposition of H2O2. The optimum operating conditions for permeabilization were observed at 53.7% concentration of isopropyl alcohol, treatment time of 40 min and temperature of 15.6oC. A maximum value of catalase activity was found to be 6.188 U/g wet wt. and was ca. 60 times higher than the catalytic activity of yeast not treated by the permeabilization process.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 2; 31-35
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal stability for the effective use of commercial catalase
Autorzy:
Miłek, J.
Wójcik, M.
Verschelde, W.
Powiązania:
https://bibliotekanauki.pl/articles/779418.pdf
Data publikacji:
2014
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
catalase
Terminox Ultra
thermal deactivation
energy of thermal deactivation
hydrogen peroxide
Opis:
Catalase with the commercial catalase name Terminox Ultra is widely used in the textile industry in bleaching processes. This enzyme is used to catalyse the decomposition of residual hydrogen peroxide into oxygen and water. In this study catalase was kept for about 30 hours in water baths in a temperature range from 35 to 70°C. For the first time, the kinetics of thermal deactivation of this enzyme was examined using an oxygen electrode. Stability of the enzyme depends strongly on temperature and its half-life times are 0.0014 h and 7.6 h, at 35 and 70°C, respectively.
Źródło:
Polish Journal of Chemical Technology; 2014, 16, 4; 75-79
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economical and safe method of granular material storage in silos in offshore port terminals
Autorzy:
Sondej, M.
Ratnayake, C.
Wójcik, M.
Powiązania:
https://bibliotekanauki.pl/articles/260491.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
silo
corrugated sheet
granular material
port terminal
Opis:
The article discusses issues related with storage of granular materials in silos made of corrugated sheets and reinforced with vertical ribs. Advantages and disadvantages of these structures are named, and typical technological solutions used by largest silo producers are presented. Moreover, basic assumptions of Eurocode 3 are discussed in the context of determining the buckling load capacity of a ribbed jacket. Alternative methods are indicated to determine the silo stability using analytical and FEM based methods. General conclusions are formulated with respect to designing of silos made of corrugated sheets.
Źródło:
Polish Maritime Research; 2018, 3; 62-68
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Application of the Laplace Transform for Modeling of Gas Flow Using Maple®
Autorzy:
Wójcik, M.
Szukiewicz, M.
Kowalik, P.
Powiązania:
https://bibliotekanauki.pl/articles/972896.pdf
Data publikacji:
2014
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
Laplace transform
mathematical model
differential equations
Maple program
Opis:
The Laplace transform is powerful method for solving differential equations. This paper presents the application of Laplace transform to solve the mathematical model of gas flow through the measuring system. The basis of the mathematical model used to describe and simulate the analyzed process is a system of ordinary differential equations. As a result is obtained a single algebraic equation in terms of the complex variable s. In order to study the dynamics of the system these equation should be reverted to the time domain by performing an inverse Laplace transform. Calculations were performed in the environment of Maple®. Determining of mixing in a u-shape vessel is aim of presented calculations.
Źródło:
Journal of Applied Computer Science Methods; 2014, 6 No. 1; 43-53
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Numerical Laplace Inversion Methods in Chemical Engineering with Maple®
Autorzy:
Wójcik, M.
Szukiewicz, M.
Kowalik, P.
Powiązania:
https://bibliotekanauki.pl/articles/108690.pdf
Data publikacji:
2015
Wydawca:
Społeczna Akademia Nauk w Łodzi
Tematy:
numerical inversion of Laplace transform
gas flow model
Maple program
Opis:
In this paper, the procedure of choice of the effective numerical inversion method of Laplace transform for solving of the mathematical model of gas flow was shown. Two inversion methods are evaluated in this work: the GaverStehfest method, and the Dubner and Abate method. The numerical tests has been made using test functions. Based on the test results the fast and accurate method was selected and applied for modeling of the gas flow. The GaverStehfest method has proven the most effective. The model was developed using the computer algebra system Maple®. Implementation of the methods were done by authors.
Źródło:
Journal of Applied Computer Science Methods; 2015, 7 No. 1; 5-15
1689-9636
Pojawia się w:
Journal of Applied Computer Science Methods
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Immobilizacja lipazy metodą zol-żel
Immobilization of lipase by sol-gel method
Autorzy:
Kmiecik, J.
Wójcik, M.
Powiązania:
https://bibliotekanauki.pl/articles/2070380.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
immobilizacja
lipaza
zol-żel
biokatalizator
TMOS
immobilization
lipase
sol-gel
biocatalyst
Opis:
Badano immobilizację lipazy z Candida rugosa metodą zol-żel. Puła-kowanie enzymu w żelu wykonano używając tetrametoksysilanu i fluorku sodu. Magnetyt dodawano, aby umożliwić separację biokatalizatora. Aktywność lipazy określano spektrofotometrycznie. Stwierdzono, że biokatalizator może być stosowany wielokrotnie w operacjach okresowych. Potwierdzono także długookresową stabilność biokatalizatora podczas przechowywania.
Immobilization of lipase from Candida rugosa by sol-gel method was studied. The gel-entrapped lipase was prepared by using tetramet-hoxysilane and sodium fluoride. Magnetite was added to enable separation of biocatalyst from reaction mixture. Activities of lipase were determined spectrophotometrically. It was found that the biocatalyst can be used many times in batch operations. Long-term storage stability of biocatalyst was also confirmed.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 3; 61-62
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody wierceń z płuczką : Wykorzystanie metod wiertniczych do wykonywania dolnych źródeł pomp ciepła. cz. 2
Autorzy:
Wójcik, M.
Powiązania:
https://bibliotekanauki.pl/articles/365554.pdf
Data publikacji:
2010
Wydawca:
Nowoczesne Budownictwo Inżynieryjne
Tematy:
budownictwo
płuczka
pompa ciepła
wiertnictwo
building
drilling
heat pump
muds
Opis:
W 1. części cyklu poświęconego omówieniu metod wiertniczych do wykonywania dolnych źródeł pomp ciepła ("Nowoczesne Budownictwo Inżynieryjne" 2009, nr 3 [24]) zostały omówione wiercenia okrętne oraz wiercenia wibracyjne, realizowane metodą SONIC (ryc. 1). Przed przystąpieniem do dalszej analizy metod wiercenia, wykorzystywanych do wykonania kolektorów pionowych pomp ciepła, chcę zwrócić uwagę na uprzednio przyjęte kryterium celu. Celem wykonania odwiertów pod kolektory pionowe pomp ciepła jest wprowadzenie na zadaną głębokość sondy w postaci U-kształtnej rurki o określonej średnicy rur. W przypadku pomp ciepła jest to jedyny cel wiercenia i jego spełnienie jest jedynym miernikiem powodzenia.
Źródło:
Nowoczesne Budownictwo Inżynieryjne; 2010, 1; 58-60
1734-6681
Pojawia się w:
Nowoczesne Budownictwo Inżynieryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy Logic Enhancement of Material Strain Hardening Data Obtained in the Heyers Test
Autorzy:
Skrzat, A.
Wójcik, M.
Bąk, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/354901.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fuzzy logic
plasticity
material hardening parameters
Heyer's method
Opis:
Fuzzy logic determination of the material hardening parameters based on the Heyer’s method was applied in this research. As the fuzzy input variables, the length of two measuring bases and the maximum force registered in the Heyer's test were used. Firstly, the numerical experiment (the simulation of the fuzzification of the input data) with the assumed disturbance of input variables was performed. Next, on the basis of experimental investigations (eleven samples made from the same material), the membership functions associated with the input data were created. After that, the fuzzy analysis was examined. Fuzzy material hardening constants obtained by means of the α-level optimization and the extension principle methods were compared. Discrete values of the hardening data are found in the defuzzification process, by application of the mass center method.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 1059-1065
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Loads on walls and inserts in a mass-flow silos
Autorzy:
Ding, S.
Wójcik, M.
Jecmenica, M.
Silva de, S. R.
Powiązania:
https://bibliotekanauki.pl/articles/1955779.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
silo flow/loads
insert
Lagrangian-Eulerian
adaptive
fillet
Opis:
A finite element analysis has been carried out to investigate flow patterns and loads on silos either with a ralatively steep hopper, or with a shallow hopper but in the presence of an insert. A Lagrangian-Eulerian approach was first adopted to simulate the material flow pattern, with the precondition that mass flow was obtained. It was then attempted to predict the loads exerted by granular materials on the walls of such silos. The load on the insert was also simulated. Techniques such as the adoption of adaptive meshes and filleting along sharp corners were applied in the analysis to overcome the difficulties usually encountered with large deformations in the FEM and the mathematic singularity presented by the abruptness of geometry. Filleting proved to be necessary to bring down the pressure peak at the transition level. The insert took over a significant part of the loads. Comparison with the classic theories have confirmed that the loads predicted on the wall agree quite well with the theoretical results in the silo's cylinder section, but that differences exist in the hopper section; the difference is greater when the hopper is shallower. It has also shown the limitations of predicting flow patterns of granular materials with the traditional elastic-plastic model; a more advanced model is needed.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 4; 525-538
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 83

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