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Wyświetlanie 1-15 z 34
Tytuł:
Determination of oleuropein in herbal preparation and Olea europaea L. extracts by HPLC
Autorzy:
Szymański, M.
Witkowska-Banaszczak, E.
Matławska, I.
Szymański, A.
Powiązania:
https://bibliotekanauki.pl/articles/346909.pdf
Data publikacji:
2013
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
oleuropein
Olea europaea L.
herbal products
high performance liquid chromatography
Opis:
Oleuropein is a secoiridoide monoterpene. It is found primarily in all parts of the Olea europaea L. tree, mostly in its unripe fruit and leaves. It has a number of beneficial effects on the human body, being readily absorbed from the gastrointestinal tract due to its hydrophilic properties. The paper presents a simple, rapid and precise method for the assay of oleuropein in herbal formulations and the European Olive leaf extract. Chromatographic separation was performed using a C-18 column with an acetonitrile/water 20/80% vol. mixture as the mobile phase. The method has a wide range of linearity between 0.05 and 1.5 mg/mL, very good repeatability of retention time, and accuracies between 95.8 and 103.3%. Its limit of detection is 0.04 mg/mL. The developed method was tested on two herbal formulations which are commercially available in Poland.
Źródło:
Ars Separatoria Acta; 2012-2013, 9/10; 55-63
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the concentration of the ionic liquid didecyldimethylammonium lactate on the retention and separation of pyrimidine bases
Autorzy:
Szymański, M.
Zapart, J.
Florek, G.
Szymański, A.
Powiązania:
https://bibliotekanauki.pl/articles/347003.pdf
Data publikacji:
2013
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
Tematy:
ionic liquids
reversed-phase high-performance liquid chromatography
additives
Opis:
Ionic liquids (IL) are new materials with a wide spectrum of use. Being a variable combination of an organic cation and an organic or inorganic anion, their have controllable properties. The effect of the ionic liquid added to the mobile phase on the separation of uracil derivatives is studied and demonstrated in this paper. The ionic liquid used was didecyldimethylammonium lactate, which has an advantageous effect on the separation of the analytes studied. Pyrimidine bases which were used as the test compounds are characterized by alkaline properties due to which so-called peak tailing is observed during separation. A methanol/water mixture was used as the mobile phase in the chromatographic analyses. Optimum separations were obtained for 8% levels of the organic modifier. The best separations of the test isomers were obtained for 0.01% IL added to the mobile phase. The findings obtained are evidence that the use of ionic liquids in HPLC is an efficient method for the separation of polar compounds: the duration of the analysis is shorter and the resulting peaks are sharp and symmetrical.
Źródło:
Ars Separatoria Acta; 2012-2013, 9/10; 15-24
1731-6340
Pojawia się w:
Ars Separatoria Acta
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on relationships between the content of chemical elements and polyphenols and antioxidant activity in Sambucus nigra
Autorzy:
Szymański, M.
Szymański, A.
Powiązania:
https://bibliotekanauki.pl/articles/54454220.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
Black elder is a popular medicinal plant. Its flowers contain flavonoids, phenolic acids, tannins, essential oil and other compounds. The fruits contain carbohydrates, anthocyanins, flavonoids, tannins, fatty acids, vitamins C and B2, folic acid and organic acids. According to research results, its flower extracts show anti-inflammatory and antibacterial activity, and they control the blood glucose level, whereas fruit extracts have immunostimulatory, antiviral, antibacterial and antioxidative activity. Alcoholic extracts of fruits and leaves show anti-toxoplasma activity. The objective of the present study was to determine selected chemical elements (using ICP-OES), total polyphenolic compounds (using the Folin-Ciocalteu reagent) and antioxidative activity (using the radical DPPH and total activity of iron (III) ions reduction by FRAP) in aqueous extracts of black elder-based materials. The test material included the flowers, leaves and fruits of Sambucus nigra from eight locations. The samples were powdered and sieved prior to obtaining extracts. The findings underwent the Spearman’s rank correlation analysis and cluster analysis. The tests confirmed the presence of very high and high correlations between certain chemical elements and the content of polyphenols versus antioxidative activity in the raw materials. The results of the cluster analysis revealed a series of correlations between antioxidative activity, total polyphenols and the chemical elements determined.
Źródło:
Journal of Elementology; 2022, 27, 3; 739-753
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
KRONIKA. Wystawa konserwatorska woj. warszawskiego w Pułtusku
Autorzy:
Szymański, M.
Powiązania:
https://bibliotekanauki.pl/articles/536871.pdf
Data publikacji:
1951
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
wystawa konserwatorska w Pułtusku
wystawa ochrony zabytków
wystawa zabytków woj. warszawskiego
Źródło:
Ochrona Zabytków; 1951, 3-4; 213-215
0029-8247
Pojawia się w:
Ochrona Zabytków
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prototyp stacji pogodowej dla potrzeb leśnictwa - badania pilotażowe
Prototype of the weather station for the needs of forestry - a pilot study
Autorzy:
Szymański, P.
Szymański, M.
Śmieja, M.
Brach, M.
Ożga, W.
Powiązania:
https://bibliotekanauki.pl/articles/989036.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
meteorologia
lasy
pomiary meteorologiczne
stacja pogodowa
prototypy
badania pilotazowe
arduino™
stevenson screen
sensors meteorological parameters
forest
Opis:
The aim of the study was to design a weather station dedicated for applications in the forestry. The device is thought to be used to measure temperature, pressure, humidity and sunlight and to record that data to the microSD memory card supplementing also the information on the time of measurement. The objective of the field part of the study was to gather accurate meteorological data from the interior of the forest to the geostatistical analysis, necessary for breeding purposes. Here we present the assumptions for technical equipment and describe the components of the device, including the systems of sensor and control. In the further stage of the study we performed the comparative test of the prototype with a professional weather station. The results show a very strong correlation between data form both devices, while the average error relative is at a very satisfactory level: temperature (0.15°C), relative humidity (–3.73%), pressure (–3.37 hPa) and light intensity (–0.82 klx). The project proved that it is possible to construct simple and economically grounded weather station. The total cost of presented prototype does not exceed 500 PLN (ca. 110 US$). We suggest to continue further research and development of the network of similar weather stations. It may allow to create a model of meteorological factors for bigger areas.
Źródło:
Sylwan; 2017, 161, 05; 405-412
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Navigation in emission control area zones
Autorzy:
Wiśniewski, B.
Szymański, M.
Powiązania:
https://bibliotekanauki.pl/articles/135364.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ECA
exhaust emission
ship route optimization
fuel criterion
route programming
Bon Voyage
Opis:
The article presents the origin of Emission Control Area (ECA) zones, a timetable for their enforcement, criteria of their implementation and the principles and rules of navigation in these areas. Plans and areas of the next ECA zones envisaged for the future are presented. Least fuel route programming was presented, together with a description of safety rules during the change-over procedure in operations concerning the main engine and other ship systems. An attempt to identify the problems that may be encountered when programming the routes with the use of on-board routing systems, like Bon Voyage of AWT, leading through the ECA zones, has been made. Examples of such problems, taken from a true voyage of a postpanamx container vessel on a transpacific voyage, have been presented. A generalized algorithm for programming the route leading through the ECA zone according to the least fuel criterion has been presented.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 47 (119); 116-120
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cenny zabytek architektury drewnianej na Ziemi Śląskiej
Autorzy:
Szymański, M.
Powiązania:
https://bibliotekanauki.pl/articles/535419.pdf
Data publikacji:
1956
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
kościółki drewniane na Śląsku
drewniane zabytki Śląska
kościół w Pniowie
kościół w Chechle
Źródło:
Ochrona Zabytków; 1956, 3; 191-193
0029-8247
Pojawia się w:
Ochrona Zabytków
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex Characteristics of Sintered Nd-Fe-B Magnets in Terms of Hydrogen Based Recycling
Autorzy:
Szymański, M.
Michalski, B.
Leonowicz, M.
Miazga, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1032966.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ww
Opis:
Sintered Nd-Fe-B magnets, dismantled by the P.P.H.U. Polblume company from scrap hard disc drives and medical device, were thermally demagnetized and analyzed in terms of their chemical composition, structure and magnetic properties. Magnets from hard disc drives drives had a magnetic structure of two opposite poles in a plane of a magnet and were covered with a nickel coating (around 50 μ m in thick), which however was often discontinuous and deeply scratched. The majority of the magnets were partially destroyed (broken or corroded). The magnet from hard disc drives were basically made of iron (65±1 wt%) and neodymium (30±2 wt%) however, they also included alloying elements such as Co (1-2.5 wt%), Dy (0-1 wt%) or Pr (0-5 wt%). The magnets from medical device consisted only of iron (65±1 wt%) and neodymium (34±1 wt%). Magnets of both kinds were textured thus their XRD patterns were amended. Diffraction patterns, typical for the Nd₂Fe₁₄B (φ) phase, were achieved after mechanical crushing of the bulk magnets. A regular X-ray diffraction pattern was achieved after mechanical crushing of the magnets. The microstructure of both types of the magnets, observed by scanning electron microscopy, consisted of grey grains of a Nd₂Fe₁₄B (φ) phase and a Nd-rich grain boundary phase. The magnets from hard disc drives exhibited excellent magnetic properties and anisotropy: maximum energy product above 300 kJ/m³, remanence around 1.4 T and coercivity around 1000 kA/m, slightly varying between each magnet. Magnetic properties of medical magnet were only a little worse: maximum energy product above 200 kJ/m³, remanence around 1.1 T and coercivity around 900 kA/m. Hydrogen disproportionation phase diagrams (temperature vs. pressure) were constructed for both kinds of the magnets, revealing possible conditions for the hydrogenation, disproportionation, desorption and recombination reaction.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1270-1273
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Navigational and legislative constraints for optimization of ocean routes in the Northern Pacific Ocean
Autorzy:
Szymański, M.
Wiśniewski, B.
Powiązania:
https://bibliotekanauki.pl/articles/134983.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
route programming
SPOS system
Bon Voyage system
navigational constraints
legislative constraints
Northern Pacific
Opis:
A ship sailing between the coasts of China, Japan, Korea and the Western coast of North America must cross navigational and geographical barriers of the Kuril Islands Archipelago and Aleutian Chain. Passes between the islands are particularly difficult and hazardous in winter. Most of them are covered by drifting ice for 5 months of the year. A number of allowed passes and offshore routes had been established by the maritime authorities of Alaska on the Bering Sea and in Aleutian Chain. However, use of other passes and routes is limited to exceptional cases only. Similar regulations exist in the Okhotsk Sea and other waters under Russian jurisdiction. The ship must then give grounds for a deviation from recommended or allowed passes and tracks and report other required information. Since January 1, 2015, it is mandatory to use the low sulphur fuel oil (sulphur content no higher than 0.01%) in the main propulsion system and auxiliary machinery when navigating inside the Emission Control Area (ECA) zone. Ships face a constant dilemma whether to remain in the ECA zone for the shortest or longer period of time, if the fuel and cost gain in relation to the entire route justify that. Available decision making support systems, like SPOS and Bon Voyage, do not solve that issue satisfactorily.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 48 (120); 96-104
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Large Vocabulary Continuous Speech Recognition for Polish
Autorzy:
Demenko, G.
Szymański, M.
Cecko, R.
Kuśmierek, E.
Lange, M.
Wegner, K.
Klessa, K.
Owsianny, M.
Powiązania:
https://bibliotekanauki.pl/articles/1490468.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.72.-p
43.72.+q
Opis:
In this study, the results of acoustic modeling used in a large vocabulary continuous speech recognition system are presented. The acoustic models have been developed with the use of a phonetically controlled large corpus of contemporary spoken Polish. Evaluation experiments showed that relatively good speech recognition results may be obtained with adequate training material, taking into account: (a) the presence of lexical stress; (b) speech styles (a variety of segmental and prosodic structures, various degrees of spontaneity of speech (spontaneous vs. read speech), pronunciation variants and dialects); (c) the influence of the sound level and background noises. The present large vocabulary continuous speech recognition evaluation results were obtained with Sclite assessment software. Moreover, the article delivers information about the speech corpus structure and contents and also a brief outline of the design and architecture of the automatic speech recognition system.
Źródło:
Acta Physica Polonica A; 2012, 121, 1A; A-086-A-091
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Properties of Nd-Fe-B Alloy Subjected to HDDR Process
Autorzy:
Szymański, M.
Michalski, B.
Leonowicz, M.
Miazga, Z.
Powiązania:
https://bibliotekanauki.pl/articles/352047.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
HDDR
magnets hydrogenation
Nd-Fe-B alloy
neodymium magnets
magnets recycling
Opis:
In this paper the Hydrogenation, Disproportionation, Desorption and Recombination (HDDR) route was tested, for the Nd-Fe-B master alloy, as a prospective procedure for recycling of sintered scrap neodymium magnets. The HDDR method is based on the hydrogen induced reversal phase transformation of Nd-Fe-B alloy: Nd2Fe14B + (2±x) H2 = 2NdH2±x + Fe2B + 12Fe. Microstructural observations (SEM), phase constitution studies (XRD) and measurement of magnetic properties (VSM) were done to investigate the HDDR transformation progress. It was observed that disproportionation reaction starts at the grain boundaries, where the Nd-rich phase is located. Average grain size was reduced and coercive material was produced as a result of the HDDR process. Obtained results are similar to literature data.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 217-220
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
"Błotniak" - wczoraj i dziś. Polski załogowy pojazd podwodny
The "Błotniak" - yesterday and today. Polands the manned underwater vehicle
Autorzy:
Stoltmann, P.
Szymański, M.
Powiązania:
https://bibliotekanauki.pl/articles/366386.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Medycyny i Techniki Hiperbarycznej
Tematy:
załogowe pojazdy podwodne
technologia nurkowania
manned underwater vehicle
underwater technology
Opis:
W artykule przedstawiono informacje o jedynym w Polsce załogowym pojeździe podwodnym typu mokrego o nazwie "Błotniak". Pojazd został opracowany w latach 70- tych XX w. w Akademii Marynarki Wojennej. Do dziś dane na temat jego konstrukcji były niejawne. W artykule przedstawiono rys historyczny tego typu pojazdów, gdzie szczególną uwagę zwrócono na ich zastosowanie w czasie I I II wojny światowej. Ponadto przedstawiono wymagania taktyczno-techniczne I opisano na podstawie literatury I rozmów z konstruktorami prac projektu. Zamieszczono także informacje na temat rekonstrukcji pojazdu, która została zrealizowana przez Stowarzyszenie Grupa Akwonautów militarnych "Błotniak" z Gdyni.
In the article presented the information on only in Poland the manned underwater vehicle of the wet type about the name "Błotniak". The vehicle was worked out in years 70- this XX in. in Naval University In Gdynia. To today data on the subject his construction was secret. In the article presented the historic outline of this type of vehicles, the were special attention was returned on their use during I and II of the world war. Besides presented requirements tactical- technical and one described on the ground literatures and conversation with constructors of the vehicle which was realized by the Military Aquanaut Group Association "Błotniak" from Gdynia.
Źródło:
Polish Hyperbaric Research; 2007, 4(21); 39-48
1734-7009
2084-0535
Pojawia się w:
Polish Hyperbaric Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal management in vertical-external-cavity surface-emitting lasers : an analytical approach
Autorzy:
Szymański, M.
Powiązania:
https://bibliotekanauki.pl/articles/378457.pdf
Data publikacji:
2007
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Elektronowej
Tematy:
przepływ ciepła
system VECSEL
przewodność cieplna
lasery
model analityczny
heat conduction
VECSEL system
thermal conductivity
lasers
analytical model
Opis:
This paper tackles with thermal management in optically pumped vertical-external-cavity surface-emitting lasers. The considerations are based on one-dimensional, stationary solution of heat conduction equation. It is shown that even such simplified model can provide useful hints for designing devices of this type.
Źródło:
Electron Technology : Internet Journal; 2007, 39, 3; 1-4
1897-2381
Pojawia się w:
Electron Technology : Internet Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wspomagana komputerowo ocena własności polaryzacyjnych elementów światłowodowych
Computer-aided evaluation of polarization properties of optical elements
Autorzy:
Sulej, W.
Marć, P.
Szymański, M.
Powiązania:
https://bibliotekanauki.pl/articles/153703.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
włókno światłowodowe
polaryzacja
macierz Muellera
GPIB
optical fibre
polarization
Mueller matrix
NI-VISA
Opis:
W artykule przedstawiono metodologię i wyniki pomiarów macierzy Muellera wybranych włókien światłowodowych zrealizowanych z wykorzystaniem autorskiego, specjalistycznego oprogramowania sterującego. Oprogramowanie to umożliwia zdalny i szybki pomiar oraz automatyczne wyznaczenie interesujących wielkości fizycznych opisujących badane włókna. Pomiar macierzy Muellera przeprowadzano w konfiguracji układowej: źródło światła, specjalizowany światłowodowy generator stanu polaryzacji, badane włókno oraz polarymetr z wejściem światłowodowym.
The rapid development of telecommunication and sensor technology requires more comprehensive evaluation of the optical properties of optical components used. At present it seems that in both groups of applications, obtaining information about the polarization properties of fiber-optic components used in an optical path plays an increasing role. This leads to the need for ever more sophisticated measurement techniques in which the key issue is to use a computer performing functions of control, reading and processing data. In this paper a methodology and experimental results of Mueller matrices measurements of optical fibres based on specially designed software are presented. The successive sections present: the theoretical basis of the measurement method, the measurement system, description of the library I/O - VISA and the measurement results. The developed software allows for remote and fast measurements as well as control of all devices in the measurement system. A Mueller matrix was measured based on the following configuration: a laser light source, an optical fibre polarization generator, a tested optical fibre and a polarimeter with an optical fibre adapter (Fig. 1). The presented preliminary results are satisfactory and give a very good perspective for building a measurement system that will allow for automatic characterization of not only the polarization properties of optical fibers, but also passive components made based on them. The described measurement system will be used as a base for developing the system enabling full characterization of fiber optic components with special reference to their polarizing properties.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 11, 11; 1338-1343
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of ship performance optimization systems and the bon voyage onboard routing system
Autorzy:
Wiśniewski, B.
Szymański, M.
Powiązania:
https://bibliotekanauki.pl/articles/135531.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
ocean routes programming
SPOS system
Bon Voyage system
ocean routes optimization
safety of navigation
weather navigation
weather routing
Opis:
A significant increase in demand for navigation support systems called Onboard Routing Systems (ORS) can be observed in the World’s merchant fleet. ORS is a navigation-support system that enables route programming to warn of dangers and navigation constraints and determine the required route-safety level directly onboard the vessel. In this article, an attempt to analyze and compare two ORS systems has been made: the Ship Performance Optimization System (SPOS), by the Meteo Consult Group; and the Bon Voyage system by Applied Weather Technologies (AWT). Individual items, methods, and criteria of both systems for optimization and weather forecasting models utilized have been compared. Particular attention has been paid to the usefulness of the systems regarding the problem of identification and avoidance of hazards such as tropical cyclones and wave resonance. Ergonomics of both systems has also been compared.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 47 (119); 106-115
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
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