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Tytuł:
Proba pomiaru sredniej biomasy osobniczej [SBO] epigeicznych biegaczowatych w ogniskach gradacyjnych osnui gwiazdzistej [Acantholyda nemoralis Thoms.]
Autorzy:
Guzik, G.
Powiązania:
https://bibliotekanauki.pl/articles/825071.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
fauna
ogniska gradacyjne
entomologia lesna
lesnictwo
fauna epigeiczna
bioindykacja
Slask
liczebnosc
drzewostany sosnowe
owady
struktura dominacji
biegaczowate
Carabidae
srednia biomasa osobnicza
Źródło:
Sylwan; 2000, 144, 03; 79-85
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wplyw zyznosci siedlisk i wieku drzewostanow na gradacje osnui czerwonoglowej [Acantholyda erythrocephala L.] na Slasku
Autorzy:
Guzik, G.
Powiązania:
https://bibliotekanauki.pl/articles/820349.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
osnuja czerwonoglowa
zyznosc siedliska
siedliska lesne
drzewostany sosnowe
owady
szkodniki roslin
wiek drzewostanu
lesnictwo
Acantholyda erythrocephala
gradacja
Źródło:
Sylwan; 1999, 143, 06; 61-71
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oszacowanie metodami EPR, TL i PPSL odpowiedzi próbek przy wykrywaniu potencjalnego napromieniowania żywności
Evaluation of detection of potential radiation treatment of foodstuff samples using EPR, TL and PPSL methods
Autorzy:
Guzik, G. P.
Powiązania:
https://bibliotekanauki.pl/articles/214127.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
porównania międzylaboratoryjne
EPR
TL
PSL
intercomparative studies
Opis:
VI międzynarodowe porównanie wiarygodności trzech najważniejszych metod analitycznych stosowanych do wykrywania napromieniowanej żywności zorganizowano w 2015 r. pod auspicjami Ministerstwa Zdrowia i Hiszpańskiej Agencji Bezpieczeństwa Żywności i Żywienia (AESAN) oraz Krajowego Centrum Żywności (CNA). W badaniu zatytułowanym „Międzynarodowe badanie porównawcze metodami Tl, PSL i EPR, 6 runda” brało udział dziewiętnaście specjalistycznych laboratoriów z kilku krajów europejskich. CNA jest doświadczonym laboratorium, posiadającym akredytację do wykrywania napromieniowanej żywności metodami thermoluminescencji (TL), fotostymulowanej luminescencji (PSL) i spektroskopii elektronowego rezonansu paramagnetycznego (EPR). Większość laboratoriów uczestniczących w porównaniu międzylaboratoryjnym posiada również taką akredytację. Asortyment produktów spożywczych dostępnych na rynku jest coraz szerszy, jednak nie wszystkie z nich są testowane pod kątem ich potencjalnego napromieniowania. Jest to istotny argument przemawiający za udziałem wszystkich laboratoriów w porównaniach międzylaboratoryjnych, takich jak obecnie przeprowadzane.
Under the auspices of the Ministry of Health and the Spanish Agency for Food Safety and Nutrition (AESAN) the National Food Centre (CNA) in 2015 has organised the 6th international exercise for testing the reliability of three most important analytical methods used for the detection of irradiated food. The study named ”Intercomparative exercise for quality assurance on Tl, PSL and EPR Irradiated food detection methods, 6 th Round” assembled nineteen specialized laboratories from several European countries. The organizing institution CNA possess accreditation for the detection of irradiated food and is experienced in thermoluminescence (TL), photostimulated luminescence (PSL) and electron paramagnetic resonance spectroscopy (EPR). It is also the case with most of participating laboratories. Presently the spectrum of food products found in the market is significantly extended and many of this products were not tested or validated whether their radiation treatment is detectable. This is a strong argument for the need of the organization of intercomparative studies as the present one.
Źródło:
Postępy Techniki Jądrowej; 2015, 4; 13-16
0551-6846
Pojawia się w:
Postępy Techniki Jądrowej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability of light-stimulated photoluminescence (PSL) in detection of irradiated food comparison with thermoluminescence method (TL)
Autorzy:
Guzik, G. P.
Stachowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/147688.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
irradiation
detection
food products
spices
herbs
blends
photostimulated luminescence (PPSL)
thermoluminescence (TL)
Opis:
The detection of irradiation of several classes of food products with the use of thermoluminescence (TL) and photostimulated luminescence (PPSL) has been proceeded. The comparison of the results obtained by both methods has been done and reliability of the PPSL method as compared with the TL method evaluated. Conclusion concerning the usefulness of such evaluation to the practice has been drawn.
Źródło:
Nukleonika; 2008, 53, suppl. 1; 25-29
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on radiation-induced radicals giving rise to stable EPR signal suitable for the detection of irradiation in L-sorbose-containing fruits
Autorzy:
Guzik, G. P.
Stachowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/146498.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
sorbose
crystallite
electron paramagnetic resonance (EPR)
EPR
irradiation
Opis:
The stable and complex EPR signals produced by the action of ionizing radiation on crystalline L-sorbose (C6H12O6) separated from rowan berries (Sorbus aucuparia) were studied. Isothermal heating of the samples at the temperature close to the melting point of L-sorbose (140°C) results in the modification and simplification of the EPR signal involved. In the EPR signal of heated L-sorbose, the isotropic quartet was distinguished. In the differential spectrum obtained by subtraction of normalized spectra of unheated and heated L-sorbose, the isotropic doublet was identified in addition. The DFT fitting offers the probable assignment of the EPR signals to specifi c radical structures.
Źródło:
Nukleonika; 2016, 61, 4; 461-465
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on organic radicals giving rise to multicomponent EMR spectra in dried fruits expose to ionizing radiation II. D-Glucose
Autorzy:
Guzik, G. P.
Stachowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/147173.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dried fruits
electron magnetic resonance (EMR)
irradiation
glucose
organic radicals
Opis:
Crystalline D-glucose extracted from dried resins was irradiated with 60Co gamma rays. The multicomponent EMR spectra of the samples kept at ambient temperature were compared with those heated at 105°C – the temperature close to the melting point of glucose. Normalized EMR spectra recorded with both samples were subtracted, resulting in a differential EMR spectrum. Spectral analysis of all three spectra has been done resulting in the identification of isotropic doublet of doublets assigned to less stable radical derived from parent glucose molecule.
Źródło:
Nukleonika; 2013, 58, 3; 425-428
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR study on sugar radicals utilized for detection of radiation treatment of food
Autorzy:
Guzik, G. P.
Stachowicz, W.
Michalik, J.
Powiązania:
https://bibliotekanauki.pl/articles/146706.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
density functional theory (DFT)
dried fruits
electron paramagnetic resonance (EPR)
irradiation
mannose
sorbose
Opis:
Radicals produced by ionizing radiation in sugars, the components of dried and raw fruits give rise to stable multicomponent electron paramagnetic resonance (EPR) signals unidentified so far. The subject of the present EPR study is to identify the radicals stabilized in gamma-irradiated crystalline sugars, D(+)mannose and L(-)sorbose extracted from cranberries (Vaccininum oxycoccos) and rowan berries (Sorbus aucuparia), respectively. EPR measurements and density functional theory (DFT) simulations were employed for that purpose.
Źródło:
Nukleonika; 2012, 57, 4; 545-549
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on stable radicals produced by ionizing radiation in dried fruits and related sugars by electron paramagnetic resonance spectrometry and photostimulated luminescence method – I. D-fructose
Autorzy:
Guzik, G. P.
Stachowicz, W.
Michalik, J.
Powiązania:
https://bibliotekanauki.pl/articles/147212.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
fructose
PPSL
EPR
irradiation
detection
food products
Opis:
Stability of sugar born radicals separated from irradiated Iranian dried raisins and from D-fructose by Sigma Aldrich has been studied at room temperature by EPR and PPSL methods in a period of 360 days. It has been proven for the first time experimentally that the complex EPR spectrum of irradiated sugars is changed in time and after heating. Hence, this made it possible to distinguish spectral lines of two specific radicals contributing to the formation of multicomponent spectra, recorded in both time dependent and heating experiments. The radicals measured by EPR and energy traps detected by PPSL decay at room temperature in a similar way, suggesting a similar distribution of both species in sugar crystallites. We think that our experimental approach might be useful to study interrelation between the formation and trapping of radicals and energy accumulated in crystalline matrices. In order to achieve the isolation of individual sugars from fruits the extraction and specific separation procedures have been adapted with the use of methanol, ethanol and water solvents. Our results clearly show that radicals induced by radiation in fruits (with fructose born radicals as major constituent) are stable enough at room temperature for easy identification of irradiated raisins using the EPR method.
Źródło:
Nukleonika; 2008, 53, suppl. 2; 89-94
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of irradiated dried fruits using EPR spectroscopy
Autorzy:
Guzik, G. P.
Stachowicz, W.
Michalik, J.
Powiązania:
https://bibliotekanauki.pl/articles/148844.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dried fruits
electron paramagnetic resonance (EPR)
fructose
glucose
irradiation
Opis:
The dominating carbohydrates in fruits are monosaccharides like fructose, glucose, sorbose and mannose. In dehydrated fruits, concentration of monosaccharides is higher than in fresh fruits resulting in the formation of sugar crystallites. In most of dried fruits, crystalline fructose, and glucose dominate and appear in proportion near to 1:1. Irradiation of dried fruits stimulates radiation chemical processes resulting in the formation of new chemical products and free radicals giving rise to multicomponent EPR signal which can be detected for a long period of time. For that reason, it is used as a marker for the detection of radiation treatment of dried fruits. It has been found that EPR spectra recorded in dried banana, pineapple, papaya, and fig samples resemble the EPR spectrum obtained by computer addition of fructose and glucose spectra taken in proportion 1:1. The decay of radiation induced EPR signals proceeds in dried fruits fast during the first month of observation and becomes much slower and almost negligible after prolonged storage. However, it remains intense enough for EPR detection even one year after processing. The radiation induced EPR signal is easily detected in dried fruits exposed to 0.5 kGy of gamma rays. Thus, the EPR method of the detection of irradiated fruits can be used for the control of dried fruits undergoing quarantine treatment with 200–300 Gy of ionizing radiation.
Źródło:
Nukleonika; 2015, 60, No. 3, part 2; 627-631
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection of radiation treatment of dry plant extracts by thermoluminescence and pulsed photostimulated luminescence. Comparative study
Autorzy:
Lehner, K.
Malec-Czechowska, K.
Stachowicz, W.
Guzik, G.
Powiązania:
https://bibliotekanauki.pl/articles/148034.pdf
Data publikacji:
2009
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
plant extract
detection
irradiation
thermoluminescence
photostimulated luminescence
Opis:
Results of the examination of the variety of dry plant extracts (Thyme extract, Celery seed extract, Artichoke extract, Citrus aurantium extract and others) by two different detection methods are described. Both PSL and TL methods are presented and discussed. Comparative study based on the analysis of the results obtained by thermoluminescence (TL) and photostimulated luminescence (PSL) measurements delivered the arguments that preselection of detection methods based on model studies is rational to be adapted in analytical laboratories specialized in the detection of irradiated foods.
Źródło:
Nukleonika; 2009, 54, 2; 99-105
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical model of piston ring sealing in combustion engine
Autorzy:
Koszałka, G.
Guzik, M
Powiązania:
https://bibliotekanauki.pl/articles/258834.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
exhaust gas blow-by
displacements of rings
twisting of rings
oil film
cylinder
piston
ring
mathematical model
lubrication
Opis:
This paper presents a mathematical model of piston-rings-cylinder sealing (TPC) of a combustion engine. The developed model is an itegrated model of gas flow through gaps in TPC unit , displacements and twisting motions of piston rings in ring grooves as well as generation of oil film between ring face surfaces and cylinder liner. Thermal deformations and wear of TPC unit elements as well as heat exchange between flowing gas and surrounding walls , were taken into account in the model. The paper contains descriptions of: assumptions used for developing the model , the model itself, its numerical solution as well as its computer application for carrying out simulation tests.
Źródło:
Polish Maritime Research; 2014, 4; 66-78
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of friction force determination method on results obtained from model of gas flow from combustion chamber to the crankcase
Autorzy:
Koszałka, G.
Niewczas, A.
Guzik, M.
Powiązania:
https://bibliotekanauki.pl/articles/245664.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
blowby
piston ring
friction force
mathematical model
Opis:
The paper presents investigation of the influence of the friction force calculation method on the results of simulations run with the use of the model ofgas flow from the combustion chamber to the crankcase and piston rings motion in the grooves. The first series of simulations was run using the gas flow and ring motion model in which the friction force was calculated from the empirical equation. The second series was run with the use of the gas flow and ring motion model fully integrated with the ring lubrication model. In that case the friction force was derived from the hydrodynamic model of ring lubrication. Comparison of the results obtained in the first and second series of simulations indicated that despite the fact that the friction forces calculated with these two methods differed considerably, the method of friction force calculation had insignificant effect. This refers to the ąuantities determined in the simulations which are most important from practical point of view - i.e. displacements of the rings in the grooves, pressure courses in inter-ring regions and blowby rate. It is not necessary to integrate the gas flow and ring motion model with the model of ring lubrication, and doing so to complicate it very much, if the aim of the calculations is simulation of blowby and rings behaviour in the grooves.
Źródło:
Journal of KONES; 2009, 16, 4; 223-239
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A numerical model for calculation of piston rings wetted area in a combustion engine
Autorzy:
Guzik, M.
Koszałka, G.
Niewczas, A.
Powiązania:
https://bibliotekanauki.pl/articles/246518.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
ring pack
lubrication
simulation
wear
mechanical losses
Opis:
Assumptions made while modelling the oil film between the ring and the cylinder liner in IC engines, especially concerning the boundaries of the wetted area of the ring face surface, were discussed and the assumptions adopted for the developed model were presented in this study. It was assumed that the model should take into account partially flooded lubrication, which meant that the boundaries of the ring wetted area had to be determined. Based on the adopted assumptions, a model for calculation of the oil film thickness between the cylinder and moving rings, and thickness of the oil film left on the cylinder by the ring pack was developed. A computer application operating in the Windows operation system was developed to carry out numerical calculations. The results of initial numerical calculations were also presented. The proposed model can be utilized to determine the effects of the ring pack geometry, especially the geometry of the ring surface, on parameters of lubrication. These parameters, including the oil film thickness, distribution of pressure in oil film or tangential force, are crucial for friction and wear of cooperating surfaces, oil consumption, and flow of gas from the combustion chamber to the crankcase, thus playing a role in the durability, fuel consumption and emission of an engine.
Źródło:
Journal of KONES; 2012, 19, 3; 156-164
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The content of heavy metals in shells of Mytilus sp. from the Adriatic, Baltic and Black seas
Autorzy:
Gal, A.
Guzik, M.
Kuczkowska-Kuzniar, A.
Formicki, G.
Stawarz, R.
Powiązania:
https://bibliotekanauki.pl/articles/84122.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
heavy metal content
shell
Mytilus
salt water mussel
marine bivalve mollusc
animal species
Adriatic Sea
Baltic Sea
Black Sea
statistical analysis
Źródło:
Folia Malacologica; 2012, 20, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 22

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