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Tytuł:
Studies of Plasma-Focus discharges within the PF-360 facility equipped with a planar D2O-ice target
Autorzy:
Zebrowski, J.
Baranowski, J.
Jakubowski, L.
Sadowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/147057.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
cryogenic target
ion beams
neutron yield
plasma focus
X-rays
Opis:
The paper reports on investigations of dense magnetized plasmas produced within a modernized PF-360 facility, which was operated with an additional planar cryogenic target placed in the front of the electrode outlet and covered with D2O-ice layers. The main aim of these studies was to overcome the neutron saturation effect and to increase the maximum neutron yield from PF discharges by using fast deuteron beams. Such beams are usually emitted from a pinch region and can produce fast neutrons from D-D reactions during their interactions with the additional target.
Źródło:
Nukleonika; 2001, 46, suppl. 1; 65-68
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi - body simulations of railway wagon dynamics
Autorzy:
Wójcik, K.
Małachowski, J.
Baranowski, P.
Mazurkiewicz, Ł.
Damaziak, K.
Krasoń, W.
Powiązania:
https://bibliotekanauki.pl/articles/246886.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
multi-body
MSC ADAMS
railway wagon
dynamics
Opis:
The main aim of the presented paper is to verify the dynamics of chosen railway wagon using multi-body methods. Thus, in tests a wagon prototype with rotational rail-car body was simulated, which is going to be used for TIR vehicles trailer bodies transporting. Implemented prototype is authored by the team from Department of Applied Mechanics and Computer Science from Faculty of Mechanical Engineering in Military University of Technology. For this purpose CAD model, and subsequently numerical model, of mentioned wagon was developed. Using MSC Adams software initial boundary conditions, material parameters and contact characteristics were defined. In the previous authors' paper [1], preliminary analyses of the loads acting on the railway platform were carried out, which verified chosen parameters and coefficients. The main aim of presently proposed 3D multi-body simulations of railway wagon is to investigate its motion with full load and to determine the operation limit safety. Thus, in the performed analyses the railway wagon was accelerated to the desired velocity and drove through the curved tracks with four different velocities. From the carried out simulations the wagon dynamic behaviour was investigated and obtained results including contact forces characteristics were compared from all analyses cases. Moreover, performed study shows that the MSC. Adams software is capable for analysing and simultaneously validating various complex engineering problems, such as the one investigated by the authors.
Źródło:
Journal of KONES; 2012, 19, 3; 499-506
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New slow-release fertilizers - economic, legal and practical aspects: a Review
Autorzy:
Wesołowska, M.
Rymarczyk, J.
Góra, R.
Baranowski, P.
Sławiński, C.
Klimczyk, M.
Supryn, G.
Schimmelpfennig, L.
Powiązania:
https://bibliotekanauki.pl/articles/2083050.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
slow-release and controlled-release fertilizers
national emission ceilings directive
greenhouse gas emissions
NH3 emisions
Opis:
The improper adjustment of the release characteristics of commonly used mineral fertilizers to the nutritional requirements of plants results in the loss of a significant part of them by infiltration into the soil profile or in the form of greenhouse gas emissions into the atmosphere. Legal regulations including the national emission ceilings directive, require the Member States of European Union to limit ammonia emissions from agriculture. In order to minimize the losses of valuable nutrients and to reduce greenhouse gas emissions it is necessary to find new solutions and technologies in agriculture. Specialists emphasize the beneficial effects of localized fertilization methods and the use of the slow-release/controlled-release fertilizers. Field studies conducted on newly obtained fertilizers prove their beneficial effect on the quality and quantity of the crop but currently the products offered on the market are too expensive to use in large acreage crops. This article presents an overview of some particular economic, legal and practical aspects of slow-release fertilizer production and use. Additionally, the results of field tests indicating their beneficial effect on plant yield, the plant response to stressful conditions and methods for environmental protection are also presented.
Źródło:
International Agrophysics; 2021, 35, 1; 11-24
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of antioxidant components of tomato using VIS-NIR reflectance data by handheld portable spectrometer
Autorzy:
Szuvandzsiev, P.
Helyes, L.
Lugasi, A.
Szanto, C.
Baranowski, P.
Pek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/25194.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
antioxidant component
tomato
Lycopersicon esculentum
vegetable
lycopene
polyphenol
spectrometer
near infrared reflectance spectroscopy
Opis:
Processing tomato production represents an important part of the total production of processed vegetables in the world. The quality characteristics of processing tomato, important for the food industry, are soluble solids content and antioxidant content (such as lycopene and polyphenols) of the fruit. Analytical quantification of these components is destructive, time and labour consuming. That is why researchers try to develop a non-destructive and rapid method to assess those quality parameters. The present study reports the suitability of a portable handheld visible near infrared spectrometer to predict soluble solids, lycopene and polyphenol content of tomato fruit puree. Spectral ranges of 500-1000 nm were directly acquired on fruit puree of five different tomato varieties using a FieldSpec HandHeld 2™ Portable Spectroradiometer. Immediately after spectral measurement, each fruit sample was analysed to determine soluble solids, lycopene and polyphenol content. Partial least square regressions were carried out to create models of prediction between spectral data and the values obtained from the analytical results. The accuracy of the predictions was analysed according to the coefficient of determination value (R2), the root mean square error of calibration/cross-validation.
Źródło:
International Agrophysics; 2014, 28, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of numerical testing methods in terms of impulse loading applied to structural elements
Autorzy:
Mazurkiewicz, Ł.
Małachowski, J.
Baranowski, P.
Damaziak, K.
Powiązania:
https://bibliotekanauki.pl/articles/280777.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
blast wave
FEM
Eulerian mesh
Opis:
This paper presents comparison of numerical testing methods of an impulse loading which comes from a detonation process, i.e. blast wave propagation in a gas medium. Investigations were carried out using an analytical and numerical model based on the Finite Element Method. In order to reduce computational time, the substitute analytical model with one degree of freedom was implemented, which replaced a chosen actual system (I-section steel column). For structure modelling, the constitutive model was used, which included the strain rate effect. From the performed analyses, an acceptable similarity was noticed, although the discrete model due to greater forces gave inflated results. Nevertheless, it should be pointed out that simplified methods do not take any wave and flow around effects into consideration, which have an influence on the dynamical response of the structure and are possible to implement in the gas medium coupling.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 615-625
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of layers distribution in the composite coupon using finite element method and three point bending test
Autorzy:
Mazurkiewicz, Ł.
Małachowski, J.
Damaziak, K.
Baranowski, P.
Gotowicki, P.
Powiązania:
https://bibliotekanauki.pl/articles/387164.pdf
Data publikacji:
2013
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
fibre reinforced composite
FE analysis
hand lay-up technique
experimental validation
kompozyt włóknisty
analiza elementów skończonych
weryfikacja doświadczalna
Opis:
The main objective of the study is to develop experimentally validated FE model and perform numerical analysis of layered composites made by hand lay-up techniques during tension and bending test. The research object is glass - polyester laminate made of four unidirectional layers. In order to validate the numerical models experimental test were performed. Due to the very different stiffness modulus in tension and bending loading the material properties obtained from standard test are not suitable to apply in numerical model. Significantly different behaviour compared to experimental test was obtained for tree point bending where the numerical model becomes too stiff. Simple coupons, relatively easy to manufacture presented in the paper have very low quality. The differences in actual and theoretical bending stiffness (obtained from tension stiffness) exceed 70%. In order to represent the actual structure the layers of the composite were divided by resin layers and also additional resin layer at the top and bottom of the model were defined. Single stage optimization process was used to adjust the material layout. After layer set-up modification very significant improvement can be seen for flexural behaviour.
Źródło:
Acta Mechanica et Automatica; 2013, 7, 3; 160-165
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Load carrying capacity numerical study of I-beam pillar structure with blast protective panel
Autorzy:
Mazurkiewicz, L.
Kolodziejczyk, D.
Damaziak, K.
Malachowski, J.
Klasztorny, M.
Baranowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/202056.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FE analysis
blast protection
stability study
Opis:
The paper presents numerical analyses aimed at preliminary assessment of the protective panel effectiveness, which task is to protect the elements of building structures against explosion. For the criterion of assessing the effectiveness of the panel the load capacity of the column made of steel I-beam was chosen. Ultimate force was determined by using advanced computational procedure, which consisted of four stages: preload, blast simulation, dynamic response and static analysis of deformed structure. Blast load was simulated using Lagrangian- Eulerian domain coupling. Results indicated that the application of the protective panel significantly reduces the plastic deformation of the structure.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 451-457
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The carcinogenic effects of benzoquinones produced by the flour beetle
Autorzy:
Lis, L.
Bakula, T.
Baranowski, M.
Czarnewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/31981.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
beetle
benzoquinone
carcinogenic effect
enterotoxic activity
enterotoxin
flour beetle
healthy effect
2-methyl-1,4 benzoquinone
2-ethyl-1,4 benzoquinone
Tribolium confusum
red flour beetle
Tribolium castaneum
Opis:
Humans and animals come into contact with various compounds in their natural environment. Most of the encountered substances are neutral, yet some may carry adverse health effects. The ingested food may be a source of harmful substances, including benzoquinones which, as shown by research results cited in this paper, demonstrate toxic, carcinogenic and enterotoxic activity. This group of compounds is inclusive of 2-methyl-1,4-benzoquinone (MBQ) and 2-ethyl-1,4-benzoquinone (EBQ), defensive secretions of the confused flour beetle (Tribolium confusum J. du V) and the red flour beetle (Tribolium castaneum Herbst). Benzoquinones have a carcinogenic effect, they are inhibitors of growth of various microorganisms, they produce a self-defense mechanism in threat situations and affect population aggregation. As noted by the referenced authors, the properties of benzoquinones have not been fully researched to this date.
Źródło:
Polish Journal of Veterinary Sciences; 2011, 14, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time Resolved Photoluminescence Study of the Wide (Cd,Mn)Te/(Cd,Mg)Te Quantum Well
Autorzy:
Kutrowska, J.
Bugajny, P.
Baranowski, M.
Bryja, L.
Syperek, M.
Wójs, A.
Misiewicz, J.
Wiater, M.
Karczewski, G.
Powiązania:
https://bibliotekanauki.pl/articles/1399154.pdf
Data publikacji:
2013-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
78.47.D-
78.67.De
Opis:
The static and dynamic properties of excitons and trions in a 80 nm wide $Cd_{1-x}Mn_xTe/Cd_{0.7}Mg_{0.3}$Te quantum well with extremely small Mn content (x=0.00027) have been studied by means of time-integrated and time-resolved photoluminescence experiment at low and elevated temperatures. The trion binding energy has been estimated to be 2.6 ± 0.8 meV. The exciton and trion lifetimes have been measured to be ≈ 150 ps, and ≈ 200 ps, respectively. The temperature dependence of both lifetimes together with the multicomponent character of the PL decay process suggest a spatial localization of excitons and trions in the investigated quantum well.
Źródło:
Acta Physica Polonica A; 2013, 124, 5; 895-897
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interference of nematode parasitism by silencing of plant genes
Autorzy:
Koter, M.
Matuszkiewicz, M.
Baranowski, L.
Sobczak, M.
Wisniewska, A.
Dabrowska-Bronk, J.
Swiecicka, M.
Skowron, W.
Filipecki, M.
Powiązania:
https://bibliotekanauki.pl/articles/80931.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
nematode
crop rotation
parasitism
plant gene
gene silencing
GTP-binding protein
plant fertility
biotic stress
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wpływu uproszczenia modelu matematycznego na parametry procesu samonaprowadzania rakiety przeciwlotniczej sterowanej jednokanałowo
The analysis of mathematical model simplifications on parameters of anti-aircraft one-canal controlled missile homing guidance process
Autorzy:
Gacek, J.
Baranowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/223334.pdf
Data publikacji:
2009
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
technika rakietowa
samonaprowadzanie
dynamika lotu
missile technology
homing guidance
flight dynamics
Opis:
W pracy podjęto próbę dokonania analizy wpływu uproszczeń modelowych na symulację procesu samonaprowadzania (dokładność i czas trwania obliczeń) na przykładzie rakiet przeciwlotniczych sterowanych jednokanałowo. Uzyskano komputerowe wyniki obliczeń w oparciu o dwa — o różnym stopniu uproszczenia — modele matematyczne lotu rakiety 9M39 z przenośnego zestawu przeciwlotniczego Igła (9K38). Wyniki i wnioski z przeprowadzonych badań numerycznych zilustrowano rysunkami i wykresami.
An attempt was made to analyze the effect of the model simplifications on homing process simulation (accuracy and computation time) based on the example of anti-aircraft one-canal controlled missiles. The computer-based calculation results were obtained on the basis of two differently approximated mathematical models for missile 9M39 of the portable anti-aircraft missile system Igla (9K38). The solutions and conclusions are illustrated by figures and drawings. Keywords: missile technology, homing guidance, flight dynamics.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2009, R. 50 nr 4 (179), 4 (179); 19-34
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Domestication of the red fox (Vulpes vulpes) reflected in metric characters of selected thoracic girdle bones
Domestykacja lisa pospolitego (Vulpes vulpes) odzwierciedlona w cechach metrycznych niektórych kości pasa barkowego
Autorzy:
Felska-Blaszczyk, L.
Baranowski, P.
Seremak, B.
Pedzinska, K.
Nowak, P.
Lasota, B.
Steller, O.
Powiązania:
https://bibliotekanauki.pl/articles/45047.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Opis:
The aim of this study was to compare the characters of the pectoral girdle morphological elements between the wild and captive, farm-bred forms of the red fox. The study was conducted on the humeri, radii, ulnae, and scapulae collected from 24 wild and 20 farmed red foxes. Each individual was posthumously measured for body weight and natural length, and the bones of the anterior girdle were collected. Images of humeri and their epiphyses were used for measurements. Statistical analysis of the measurements suggests that most metric characters of the shoulder girdle bones are greater in farmed fox. Captive foxes are characterized by a larger body weight and a shorter body as compared to the wild form. There were significant (P ≤0.01, P ≤0.05) dimorphic differences in the length and breadth of the humeral epiphysis and radial epiphysis. Also, we found a significant (P ≤0.01, P ≤0.05) effect of origin on the length of the bones.
Celem badań było porównanie wartości cech morfologicznych elementów obręczy barkowej lisa pospolitego dzikiego i hodowlanego. Badania przeprowadzono na kości ramiennej, promieniowej, łokciowej i łopatce 24 lisów pospolitych dzikich i 20 lisów hodowlanych. Po uboju określono masę ciała i długość naturalną każdego osobnika, a na pobranym odcinku obwodowym przednim wykonano pomiary wymienionych kości, wykonano fotografie rzutów poziomych kości ramiennych i nasad tych kości. Analiza statystyczna wybranych cech szkieletu obręczy barkowej wskazuje na zwiększenie wartości większości cech badanych kości. Osobniki pochodzące z hodowli charakteryzowały się większą masą, ale mniejszą długością ciała. Stwierdzono istotne (P ≤ 0.01; P ≤ 0.05) różnice dymorficzne dla cech długości i szerokości nasad kości ramiennej i promieniowej oraz istotny (P ≤ 0.01; P ≤ 0.05) wpływ pochodzenia lisów na cechy długości tych kości.
Źródło:
Acta Scientiarum Polonorum. Zootechnica; 2013, 12, 2
1644-0714
Pojawia się w:
Acta Scientiarum Polonorum. Zootechnica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GaN Synthesis by Ammonothermal Method
Autorzy:
Dwiliński, R.
Wysmołek, A.
Baranowski, J.
Kamińska, M.
Doradziński, R.
Garczyński, J.
Sierzputowski, L.
Jacobs, H.
Powiązania:
https://bibliotekanauki.pl/articles/1933907.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Dn
Opis:
It is shown that ammonothermal method can be successfully used to synthesize GaN powder of good crystallographic quality from ammonia solution at high pressure and a moderate temperature. The size of obtained GaN powder grains was of a few micrometers. The improvement of the powder crystalline quality (examined by X-ray rocking curve, scanning electron microscopy and luminescence measurements) with increasing molar proportion of mineralizer was observed. It was therefore possible to conclude that high molar proportion of mineralizer in ammonia solution plays a crucial role in the polycrystal growth process. Visible luminescence of high efficiency from the GaN powder was found.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 833-836
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On GaN Crystallization by Ammonothermal Method
Autorzy:
Dwiliński, R.
Baranowski, J. M.
Kamińska, M.
Doradziński, R.
Garczyński, J.
Sierzputowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/1950744.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Dn
Opis:
GaN crystals are grown using ammonothermal method at pressures below 5 kbar and temperatures below 550°C. In this method, GaN is synthesised from high purity metallic gallium. The main role in the low temperature GaN crystallization is played by the chemically active and dense ammonia and dissolved mineralizer. Morphology of the obtained crystals as well as solubility experiments prove that gallium nitride is dissolved and crystallised from solution. Physical properties of GaN crystals obtained using ammonothermal method depend on the growth conditions and the type of mineralizer. All GaN samples reveal very intensive photoluminescence, also at room temperature. The spectra of crystals grown with lithium compound mineralizer are shifted towards higher energies in comparison to crystals grown with potassium based mineralizer. At helium temperatures, phosphorescence is also observed.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 763-766
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 53

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