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Wyszukujesz frazę "Barczak, K." wg kryterium: Autor


Tytuł:
Application of Photonic Crystal Fiber in Optical Fiber Current Sensors
Autorzy:
Barczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/1417932.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.-a
42.79.Pw
33.20.Kf
42.25.Bs
Opis:
Optical fibers may be applied in the technique of measuring electric current, particularly as so-called optical current transducers. They are small in size, cheap, light and safe. Their sensitivity, however, connected with the Faraday effect, is rather poor, and they are also susceptible to considerable disturbances (deformations of the fibers). Their sensitivity can be increased by lengthening the path of effect, but this involves also an increase of noise and greater fluctuations of the measured signal due to changes of internal stresses induced by external factors. These negative phenomena can be reduced by applying fibers less sensitive to deformations. The author supposes that photonic crystal fiber with a glass core may display such properties. Orifices in the cladding can to some extent prevent the propagation of deformations from outside the core, and thus decrease the birefringence of the fiber induced by elastooptic effects. The paper presents preliminary measurements of typical photonic crystal fiber exposed to mechanical vibrations.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 793-795
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetooptic Effects in the Photonic Crystal Fiber as a Function of the Polarization State
Autorzy:
Barczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/1399333.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Bs
42.79.Pw
33.20.Kf
42.70.-a
Opis:
In optical fibers there exists an optical birefringence induced by external factors and stress produced in technological processes. The induced birefringence makes difficult to apply optical fibers in heads of polarimetric sensors. It has been proposed to use a photonic crystal fiber working in an index guiding regime due to the small value of stress in a fiber core produced by internal and external factors. This article presents an expansion of our earlier investigations. The expansion consists of investigations concerning the influence of external magnetic field induction on the state of polarization of light in the function of an azimuth of the input linear polarization ϕ. On the basis of the resulting characteristics optimal working points of the tested fiber were determined.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 384-386
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical fibre current sensor for electrical power engineering
Autorzy:
Barczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/200123.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnetooptic effect
optical fiber current sensors
polarimetric sensors
Opis:
The paper presents the experimental results of the investigations of optical fibre current sensors with an external transformation. The head of the sensor is made of the glass which has a high value of the Verdet constant. The sensor was built on the glass bar (with high value of the Verdet coefficient), polarisers, plastic optical fibres, a light source and a detector module. The paper deals with magnetic field measurements of two types of electrical current conductors: a typical conductor with circular cross-section and a busduct. Output signals from the optical current sensor were displayed on the digital oscilloscope and memorized in ěComp for a further analysis. This type of sensor was investigated on a laboratory stand and on an electrical power line which included conductor where the high intensity electric current flow. The constructed optoelectronic current sensor was tested for detection of current with intensity of the order of 200 A, with an accuracy of a few percent. Practically, the upper border of the current detection by means of this sensor is much higher.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 4; 409-414
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetooptic effect of photonic crystal fiber in blue region of visible spectrum
Autorzy:
Barczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/201952.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnetooptic effects
optical fiber current sensors
photonic crystal fiber
efekt magnetooptyczny
światłowód
czujniki prądu
włókno fotoniczne kryształów
Opis:
The phenomenon of optical birefringence in optical fibers is caused by external factors and stress induced by the manufacturing process. This optical birefringence makes it difficult to apply optical fibers as a polarimetric sensors head. Author of this paper, proposes the application of index guiding photonic crystal fibers because stress values in a fiber core caused by internal and external factors are lower. In this paper investigation results extended in comparison with the previous author’s investigations are presented. This extension relies on investigation of magnetooptic for wavelength 405 nm. On the basis of experimental results optimal work points of optical sensing fibers were determined.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 683-689
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Fibre Current Sensor for Electric Power Industry
Autorzy:
Barczak, K.
Pustelny, T.
Dorosz, D.
Dorosz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1506714.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.-a
42.81.-i
42.79.Pw
78.20.Ls
Opis:
The paper deals with the optical fibre current sensor based on new optical fibre made of glass with a high value of refractive index. This kind of glass was developed to meet the requirements of these optical fibres. The aim of investigations was to develop a new optical fibre with adequate magneto-optical properties and a relatively weak linear birefringence resulting from the process of its production. These features are of essential importance for optical fibre current sensors. The results of investigations concerning such optical fibres have been presented, displaying satisfactory magneto-optical properties, as well as only low linear birefringence induced by stresses arising in the course of their manufacturing.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1087-1089
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Optical Glasses with High Refractive Indices for Applications in Optical Current Sensors
Autorzy:
Barczak, K.
Pustelny, T.
Dorosz, D.
Dorosz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1795777.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.-a
42.81.-i
42.79.Pw
78.20.Ls
Opis:
The paper concentrates on the optical fibre sensors of electric current intensity. The specially elaborated glasses with high values of refractive indices were investigated in the prepared testing stand. The glasses have possessed the refractive index values n in the range 1.6 ≤ n ≤ 2.2. For the glasses the values of the Verdet constants for two waveguides: $λ_1$ = 635 nm and $λ_2$ = 1550 nm were determined. The obtained results showed that the elaborated on the base of new glasses optical fibres are much more sensitive on the action of magnetic field than the silica fibres.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 247-249
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Fibre Magnetic Field Sensors for Monitoring οf the State of Work of Electric Motors
Autorzy:
Barczak, K.
Pustelny, T.
Zycki, Z.
Blazejczyk, T.
Powiązania:
https://bibliotekanauki.pl/articles/1795778.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.-a
42.79.Hp
42.81.-i
42.79.Pw
78.20.Ls
Opis:
The present paper deals with investigations concerning optical magnetic sensors. The most important advantage of sensors of this kind is their safety of service and insulating power. The insensitiveness of optical sensors to electromagnetic interference was discussed and experimentally investigated. The experimental investigations were concentrated on the adequate sensing fibre as well as on the sensor based on the bulk glass cylinder. The paper presents the results of magnetooptic tests of the elaborated magnetic field optical sensors and conclusions arise from them.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 250-253
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The New Sensing Fibre for Application in Optical Fibre Current Sensor
Autorzy:
Barczak, K.
Pustelny, T.
Dorosz, D.
Dorosz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811528.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Ls
42.81.Gs
42.81.Pa
42.81.Qb
Opis:
The present paper deals with investigations concerning optical fibre current sensors. They are mainly applied in measurements of the intensity of the electric current in the power lines as so-called optical transformers of the electrical current. The most important advantages of fibre current sensors are: safety of service, insulating power as well as their insensitiveness to electromagnetic interference. The investigations were concentrated on designing of adequate sensing fibre, and particularly on the choice of an adequate kind of glass, of which this fibre could be made. Besides, also the head of the fibre current sensor was designed, basing on the suggested and produced sensing fibre. The paper presents the results of magneto-optic tests of the glass and the sensing fibre.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-3-A-6
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single Mode High Refractive Index Optical Fibres
Autorzy:
Dorosz, D.
Barczak, K.
Pustelny, T.
Dorosz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811520.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.81.Pa
42.81.-i
42.81.Qb
Opis:
The present paper is focussed on the search of technology of new kinds of optical fibers characterised by good magnetooptical properties. The elaborated optical fibres are to apply in optical sensors of electric current and the magnetic field. In result of these researches and analyses a new optical fibre was put forward. Such optical fibers were designed, produced and subjected to extensive tests. This paper presents the results of investigations that were carried out as well as the parameters of the tested structures.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-63-A-68
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Sensor of the Magnetic Field in Electrical Power Engineering
Autorzy:
Barczak, K.
Pustelny, T.
Zycki, Z.
Blazejczyk, T.
Dorosz, D.
Powiązania:
https://bibliotekanauki.pl/articles/1506720.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.-a
42.81.-i
42.79.Pw
78.20.Ls
Opis:
The authors of the presented paper deal with investigations concerning applications of the optical fiber sensor of the magnetic field in electric DC engines with permanent magnets. The aim of the sensor is to measure the state of magnetization of permanent magnets (basing on the measurements of magnetic field induction). The knowledge of the state of magnetization helps to decide whether permanent magnets need to be additionally magnetized in order to prevent damages of the whole engine. This can be done automatically, even when the engine is running. For the purpose the Faraday magnetooptic effect is used. The presented investigations concern an optical fiber sensor of the magnetic field provided with a glass rod characterized a high value of the Verdet constant as the sensing element. Thanks to the application of optical fibers the connection of the sensor head with the whole measuring system is constructed of insulating material without using of electrical connections.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1090-1092
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluoride concentration in teeth of the roe deer (Capreolus capreolus) and red deer (Cervus elaphus) from areas of Poland industrially uncontaminated with fluoride compounds
Autorzy:
Palczewska-Komsa, M.
Barczak, K.
Grocholewicz, K.
Buczkowska-Radlińska, J.
Piotrowski, P.R.
Sobolewska, E.
Powiązania:
https://bibliotekanauki.pl/articles/2087218.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fluoride
biomonitoring
teeth
herbivorous
mammals
Źródło:
Polish Journal of Veterinary Sciences; 2021, 24, 1; 151-157
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of sulphur fertilisation on the content of macroelements and their ionic ratios in potato tubers
Autorzy:
Barczak, B.
Nowak, K.
Powiązania:
https://bibliotekanauki.pl/articles/13937.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
Next to nitrogen, phosphorus, potassium and magnesium, sulphur plays an important role in plant metabolism and is considered to be one of the most important nutrients. As sulphur deficit in Polish soils has been increasing in the last few decades, research has been carried out in order to evaluate the impact of different sulphur rates and forms on the content of macroelements (N, P, K, Ca, Mg, S, Na) and their ratios in the Mila cultivar potato tubers. A strict, three-year field experiment was set up on Haplic Luvisol with acid reaction (5.3 pHKCl), mean richness in available forms of phosphorus, potassium and magnesium but low in sulphur. The field experiments involved the sulphur application in doses of 20 and 40 kg S kg-1 in the form of sulphate (VI) (K2SO4 and (NH4)2SO4) as well as in elemental form (Wigor S, containing 90% of pure sulphur and 10% of bentonite). Although potatoes represent the group of crops with low sulphur requirements, the research has clearly indicated that this component has definite impact on the content of macroelements in tubers. It was found that sulphur application, irrespective of its form and rate, compared with control sample generally increased the content of nitrogen, sulphur and magnesium in potato tubers, decreasing at the same time calcium content. The effect of the form of sulphur fertilisers on the content of macroelements was not univocal. The values of all the ratios calculated (K+:Mg+2, K+:(Ca+2+Mg+2) and (K++Na+ ):(Ca+2+Mg+2)), except for K+:Ca+2, have generally decreased after sulphur application, which indicates positive changes in the nutritive value of potato tubers.
Źródło:
Journal of Elementology; 2015, 20, 1
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skład aminokwasowy białka biomasy jęczmienia ozimego (Hordeum vulgare L.) w zależności od stadium rozwoju rośliny i nawożenia azotem
Content of amino acids of winter barley biomass depending on the plant growth stage and nitrogen fertilization
Autorzy:
Barczak, B.
Nowak, K.
Powiązania:
https://bibliotekanauki.pl/articles/47231.pdf
Data publikacji:
2008
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:
aminokwasy
bialko
biomasa
Hordeum vulgare
jeczmien ozimy
nawozenie azotem
rozwoj roslin
sklad aminokwasowy
amino acid
amino acid composition
biomass
nitrogen fertilization
plant development
protein
winter barley
Opis:
Badania przeprowadzono w latach 1998-2000 w Stacji Badawczej w Wierzchucinku, należącej do Uniwersytetu Technologiczno-Przyrodniczego w Bydgoszczy. W dwuczynnikowym doświadczeniu polowym badano wpływ zróżnicowanych dawek azotu (0, 60, 120, 180 kg N∙ha-1) na zawartość azotu ogólnego oraz skład aminokwasowy białka jęczmienia ozimego w kolejnych fazach rozwojowych. W wyniku zastosowanego nawożenia azotem nastąpiło istotne obniżenie zawartości azotu ogólnego w zielonej masie jęczmienia ozimego w każdej z badanych faz jego rozwoju. Podczas wegetacji jęczmienia ozimego, a także pod wpływem nawożenia azotem, wykazano w jego biomasie istotne obniżenie zawartości większości aminokwasów egzogennych, co wskazuje na pogorszenie wartości biologicznej białka, postępujące wraz z rozwojem rośliny.
The experiments were conducted in 1998-2000 at the Research Station in Wierz- chucinek, belonging to the University of Technology and Life Science in Bydgoszcz. The two-factor field experiment was made and the effect of diverse nitrogen dosages (0, 60, 120, 180 kg N∙ha-1) on the content of total nitrogen and amino acid composition was analysed in the consecutive plant growth phases. Nitrogen fertilization significantly reduced nitrogen content in the green mass of winter barley in each phase of its growth. An essential decrease in the contents of the most exogenous amino acids was shown, which may suggest some decline in the protein biological value.
Źródło:
Acta Scientiarum Polonorum. Agricultura; 2008, 07, 1
1644-0625
Pojawia się w:
Acta Scientiarum Polonorum. Agricultura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Project of the assigning/executive manipulator to surgery
Autorzy:
Barczak, T.
Mianowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/115560.pdf
Data publikacji:
2011
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
robots
manipulator
surgery
haptics
6 dof
parallel robot
force feedback
laparoscopic surgery
Opis:
The development of an interactive remote control of robots, of sensors and of view systems has enabled an expansion of potential area of modern surgery. Initiated by an army, the project of surgery in the field of battle has become a base of new domain of knowledge. It should be noticed that surgery executed by robots as minimally invasive surgery could be more precise and less incriminating for patient then using classical methods. The topic of the research described in this elaboration is the project of the haptic device with 6 degrees of freedom intended for the work with feedback-force control. The kinematic scheme is based on a partially decoupled parallelogram mechanism POLMAN 3×2. It means that it has 3 arms, each consists of parallelogram and quadrilateral transmission-carrying mechanism. The displacement of any degree of freedom has a very little influence on other degrees of freedom. Very important problem for ergonomic and surgery precision is a signal communication between the two sides, so it can give a feeling of real touching of an operated tissue by a doctor.
Źródło:
Challenges of Modern Technology; 2011, 2, 3; 20-24
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wplyw wzrastajacych dawek azotu na plon i jakosc bialka ziarna trzech odmian jeczmienia ozimego
Autorzy:
Barczak, B
Cwojdzinski, W.
Nowak, K.
Powiązania:
https://bibliotekanauki.pl/articles/796288.pdf
Data publikacji:
1994
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
jeczmien Maron
sklad chemiczny
bialko
dawki nawozowe
jeczmien ozimy
nawozy azotowe
ziarno
odmiany roslin
uprawa roslin
jeczmien Dura
plony
nawozenie
jeczmien Goplanski
aminokwasy
Opis:
Na podstawie wyników trzyletniego doświadczenia polowego, w którym badano wpływ czterech poziomów nawożenia azotem (w kg N/ha: 0, 60, 120, 180) na plon i jakość białka trzech odmian jęczmienia ozimego (Goplański, Maron, Dura) stwierdzono, że nawożenie azotem powodowało istotny wzrost zawartości białka ogólnego w ziarnie u wszystkich odmian. Plon białka w całym zakresie badanych dawek na ogół również wzrastał, mimo że dla plonu ziarna optymalną dawką azotu było 120 kg N/ha. Wykazano, że rola nawożenia azotem w kształtowaniu wysokości plonu ziarna oraz zawartości w nim białka była porównywalna z rolą czynników pogodowych. Znaczenie odmiany było mniejsze. Nawożenie azotem w porównaniu z czynnikiem odmianowym wywierało znacznie większy wpływ również na kształtowanie się składu aminokwasowego białka. W miarę wzrostu dawek azotu, wartości wskaźnika aminokwasów egzogennych (EAA-Index) obniżały się, co było następstwem spadku zawartości większości aminokwasów egzogennych w białku ziarna.
Grain samples of three cultivars of winter barley (Goplański, Maron, Dura) grown with considerably different doses of nitrogen fertilizer were taken into consideration. The following four doses of nitrogen fertilizer were used: 0, 60, 120 and 180 kg N/ha. The results showed that the Maron cultivar had the highest yield when intensive fertilization with nitrogen was used, while the Goplański cultivar revealed the weakest reaction to the fertilization. It was noted that nitrogen fertilization caused a significant increase of crude protein content in all cultivars of winter barley. An increase of protein yield was observed with all the applied nitrogen doses, though 120 kg N/ha was considered to be the optimum nitrogen dose for grain yield. It was proved that the importance of fertilization with nitrogen in formation of protein content in winter barley grain was comparable to the importance of factors connected with particular year of harvest. The cultivar as such was of less importance.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 1994, 414; 235-244
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł

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