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Tytuł:
Ekonomiczno-rolnicze tlo rozwoju infrastruktury obszarow wiejskich
Autorzy:
Zawadzki, W
Powiązania:
https://bibliotekanauki.pl/articles/796084.pdf
Data publikacji:
1997
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
polityka regionalna
obszary wiejskie
rolnictwo
polityka rolna
infrastruktura techniczna
ekonomika i organizacja
Opis:
Obszary wiejskie wykazują w Polsce duże różnice pod względem warunków przyrodniczych i ekonomicznych, co ma istotne znaczenie w doborze kierunków i allokacji inwestycji infrastrukturalnych. Autor dokonuje wstępnej delimitaci i regionów rolniczych kraju.
Polish farming as well as availability of public utility equipment throughout the countryside are highly differentiated. An evaluation of differences among these areas was carried out based on Z. Hellwig taxonomic method. The policy of public utility infrastructure development depends on the nature of economic/agricultural region. Author differentiates 10 such regions, considering the following features: type of farmland use; morphology: soil type; agricultural organization; demography; farming intensity; urbanization and industrialization level. A number of conclusions with regard to the organizational and economic issues of rural infrastructure were given.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 1997, 445; 45-52
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Dynamics in Crystalline Semiconductors
Autorzy:
Zawadzki, W.
Powiązania:
https://bibliotekanauki.pl/articles/1400405.pdf
Data publikacji:
2013-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.28.+d
73.61.Ey
72.20.-i
Opis:
Electron dynamics in crystalline semiconductors is described by distinguishing between an instantaneous velocity related to electron's momentum and an average velocity related to its quasi-momentum in a periodic potential. It is shown that the electron velocity used in the theory of electron transport and free-carrier optics is the average electron velocity, not the instantaneous velocity. An effective mass of charge carriers in solids is considered and it is demonstrated that, in contrast to the "acceleration" mass introduced in textbooks, it is a "velocity" mass relating carrier velocity to its quasi-momentum that is a much more useful physical quantity. Among other advantages, the velocity mass is a scalar for spherical but nonparabolic energy bands ϵ(k), whereas the acceleration mass is not a scalar. Important applications of the velocity mass are indicated. A two-band k·p^ model is introduced as the simplest example of a band structure that still keeps track of the periodic lattice potential. It is remarked that the two-band model, adequately describing narrow-gap semiconductors (including zero-gap graphene), strongly resembles the special theory of relativity. Instructive examples of the "semi-relativistic" analogy are given. The presentation has both scientific and pedagogical aspects.
Źródło:
Acta Physica Polonica A; 2013, 123, 1; 132-138
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Density of States for Ballistic Electrons in Electric and Magnetic Fields
Autorzy:
Zawadzki, W.
Kubisa, M.
Powiązania:
https://bibliotekanauki.pl/articles/2011136.pdf
Data publikacji:
1999-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
73.40.Hm
78.20.Ls
Opis:
The density of states for ballistic electrons in the presence of an electric field of almost arbitrary shape is calculated for one, two, and three dimensions using the semiclassical quantization in a finite sample. The semiclassical results are compared with these of the complete quantum treatment for a constant electric field. The case of crossed electric and magnetic fields is also considered and it is demonstrated that in this configuration the density of states exhibits a transition between magnetic and electric types of motion. Implications of this transition for the quantum Hall effect are mentioned.
Źródło:
Acta Physica Polonica A; 1999, 96, 5; 603-612
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oblique Reflection of Electrons from a Potential Barrier in Heterostructures
Autorzy:
Pfeffer, P.
Zawadzki, W.
Powiązania:
https://bibliotekanauki.pl/articles/1205321.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ej
73.22.Dj
73.40.-c
75.76.+j
Opis:
Reflection of electrons from a potential barrier in heterostructures is described. An electric field of the barrier causes spin splitting of electron energies via the spin-orbit interaction and its form is calculated in the three-level $k·p$ model for a nontrivial case of unbound electrons. It is shown that if the potential barrier is the only source of the spin-orbit interaction, the spin-flip electron reflections are not possible. However, there appear two unexpected possibilities related to the spin-orbit interaction: (a) non-attenuated electron propagation in the barrier whose height exceeds the energies of incoming electrons, (b) total reflection of electrons whose energies exceed barrier's height. It is indicated that the system can serve as a source of spin-polarized electron beams.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 820-826
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Z obchodów 25 rocznicy Ludowego Wojska Polskiego
Autorzy:
Łuszczewski, A.
Zawadzki, W.
Powiązania:
W Służbie Ojczyzny 1968, nr 43, s. 2-3
Data publikacji:
1968
Tematy:
Warszawa Grób Nieznanego Żołnierza uroczystości obchody rocznicowe
Opis:
Z okazji 25-lecia ludowego Wojska Polskiego przed Grobem Nieznanego Żołnierza w Warszawie odbyła się uroczysta odprawa warty (różnych rodzajów broni) zakończona defiladą.
Fot.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
The potential of using corn dried distillers grains with solubles (DDGS) in order to improve the fermentation profile in sheep
Potencjał zastosowania suszonego wywaru z kukurydzy (DDGS) w celu poprawienia profilu fermentacyjnego u owiec
Autorzy:
Wysocka, O.
Pecka, E.
Zawadzki, W.
Powiązania:
https://bibliotekanauki.pl/articles/82568.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Źródło:
Folia Pomeranae Universitatis Technologiae Stetinensis. Agricultura, Alimentaria, Piscaria et Zootechnica; 2015, 35
2081-1284
Pojawia się w:
Folia Pomeranae Universitatis Technologiae Stetinensis. Agricultura, Alimentaria, Piscaria et Zootechnica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The occurrence of Coccidia [Eimeria sp., Isospora sp.] in commercially bred swine
Autorzy:
Polozowski, A.
Zawadzki, W.
Nowak, M.
Powiązania:
https://bibliotekanauki.pl/articles/838622.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
parasite
pig
Eimeria polita
Eimeria
agriculture experimental station
Isospora
young pig
Isospora suis
Coccidia
zoohygienic condition
Źródło:
Annals of Parasitology; 1998, 44, 3
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Młodość jako ryzyko
Autorzy:
Zawadzki, Piotr W.
Powiązania:
https://bibliotekanauki.pl/articles/473399.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Problemy Polityki Społecznej. Studia i Dyskusje; 2012, 19
1640-1808
Pojawia się w:
Problemy Polityki Społecznej. Studia i Dyskusje
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An application of Mössbauer spectroscopy in the studies of iron - molybdenum silica mesoporous materials
Autorzy:
Surowiec, Z.
Wiertel, M.
Marynowska, A.
Gac, W.
Zawadzki, W.
Powiązania:
https://bibliotekanauki.pl/articles/147814.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
iron
MCM-41 porous silica
molybdenum
Mössbauer effect
superparamagnetic nanoparticles
Opis:
Iron-molybdenum silica mesoporous materials were obtained by the application of direct hydrothermal method. Four samples with different metal contents relative to silica were investigated. Incorporation of iron and molybdenum ions in the synthesis stage led to structural changes of the MCM-41 support. With an increasing metals content, cylindrical pores of silica initially transformed into bottle-ink type pores, and then into the slit-like ones. Mössbauer spectroscopy investigations indicated that Fe ions were embedded in the silica walls and then formed nanosized crystallites in the pores. Superparamagnetic phase was observed at liquid nitrogen temperature.
Źródło:
Nukleonika; 2013, 58, 1; 137-141
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In vitro study of the effect of corn dried distillers grains with solubles on rumen fermentation in sheep
Autorzy:
Pecka-Kielb, E.
Zawadzki, W.
Zachwieja, A.
Michel, O.
Mazur, M.
Mista, D.
Powiązania:
https://bibliotekanauki.pl/articles/31638.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The aim of the in vitro study was to determine the effect of corn dried distillers grains with solubles (corn DDGS), used as a replacement for the concentrate ingredients of sheep diet, on rumen fermentation. The material for the study was the ruminal fluid of Polish Merino sheep which was incubated during 4-, 8- or 24-hour periods. Five groups of samples were prepared for in vitro fermentation: C – control, incubated with the substrate consisting of the concentrate ingredients; D1, D2 and D3, where DDGS was used as a substrate added in proportions of 10, 20 and 30% of dry matter of the concentrate; and D4, where 100% DDGS was used as a substrate. After fermentation, the gas and short chain fatty acids (SCFAs) analyses were performed using gas chromatography. The ammonia concentration and pH were also determined, and the SCFA utilization index (NGR), the fermentation efficiency (FE) and the index of cell yield of ruminal microorganisms (CY) were calculated. This research showed no effect of DDGS on the methane emission. The positive correlations between the amount of methane and ammonia concentrations in the 8- and 24-hour fermentation periods were found. DDGS addition increased propionate proportion, but decreased production of acetate (p<0.01). Additionally, D1, D2, D3 and D4 substrates lowered isobutyrate (p<0.05) and isovalerate (p<0.01) production. Based on the results obtained, it can be stated that partial substitution of the concentrate ingredients with DDGS did not have deleterious effect on sheep rumen fermentation processes.
Źródło:
Polish Journal of Veterinary Sciences; 2015, 18, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of humic-fatty acid preparation on selected haematological and biochemical serum parameters of growing rabbits
Autorzy:
Mista, D.
Rzasa, A.
Wincewicz, E.
Zawadzki, W.
Dobrzanski, Z.
Szmanko, T.
Gelles, A.
Powiązania:
https://bibliotekanauki.pl/articles/31611.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
In this study, we assessed the effect of a humic-fatty acid preparation (HFA) used in rabbit feed on certain haematological and biochemical serum parameters (the lipid profile and the Ca, P and Fe contents). A higher RBC, HGB and HCT values were observed in the groups that were given HFA. An increase in Fe concentrations were also noted. The total and LDL cholesterol were lower in the groups which received HFA than in the control group.
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 2
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of Linola and W92/72 transgenic flax seeds on the rabbit caecal fermentation - in vitro study
Autorzy:
Mista, D.
Kroliczewska, B.
Zawadzki, W.
Pecka, E.
Steininger, M.
Hull, S.
Zuk, M.
Szopa, J.
Powiązania:
https://bibliotekanauki.pl/articles/30370.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The effect of W92/72 transgenic flax seeds taken from a variety of Linola on the production of SCFA, ammonia and methane by bacteria inhabiting rabbit caecum was studied. The in vitro method was used where caecal contents from rabbits was incubated with W92/72 transgenic or Linola flax seeds, or without any additives (control samples).The total concentration of SCFA was higher in samples with the addition of flax seeds than in the control samples. The increase in concentrations of acetic, propionic and butyric acids was the highest in samples with Linola seeds added. A higher percentage of propionic and butyric acids was observed in the contents incubated with addition of flax seeds as compared to the control samples. This increase was the result of a percentage decrease in acetic acid. No differences were observed in the concentration of ammonia between fermented samples. Moreover, the addition of flax seeds resulted in slight decrease of pH in incubated samples. In gas samples, the methane level was higher in samples with flax seeds added, although the highest level was found in samples with transgenic seeds.In addition, gas pressure was significantly higher in samples with flax seeds added as compared to control samples, and this may indicate a higher intensity of microbiological fermentation processes. These studies suggest that neither Linola nor W92/72 flax seeds have any unfavorable effect on the caecal microflora activity of rabbits. A beneficial influence of flax seeds on the microbiological fermentation process in rabbit caecum was observed, based on an increase in percentage ratio of propionic acid in samples with flax seeds added.
Źródło:
Polish Journal of Veterinary Sciences; 2011, 14, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An effect of mammary gland infection caused by Streptococcus uberis on composition and physicochemical changes of cows’ milk
Autorzy:
Pecka-Kielb, E.
Vasil, M.
Zachwieja, A.
Zawadzki, W.
Elecko, J.
Zigo, F.
Illek, J.
Farkasova, Z.
Powiązania:
https://bibliotekanauki.pl/articles/31243.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
An effect of mammary gland infection caused by Streptococcus uberis on the changes in cows’ milk composition and its physicochemical properties was examined. The study was conducted in the herd of Slovak Pied breed cattle (with a share of HF blood), in 2nd and 3rd lactation, after 4th month of milking. Milk samples were collected from a quarter milking. The samples were subjected to microbiological analysis, basic milk composition, total bacteria count, somatic cell count and physicochemical properties were examined. Also analyses of protein fractions share and fatty acids profile were conducted. An effect of bacterial infection of the mammary gland bring an increase (P<0.01) in somatic cell count was observed in this study. Milk samples contaminated with S. uberis were characterized by higher (P<0.05) total bacteria count and total protein compared to milk samples collected from non-infected mammary gland. The level of κ-casein was significantly (P<0.05) decreased in cows with subclinical mastitis caused by S. uberis. Significant (P<0.05) reduction in the share of C13:0 acid, and an increased level of C18:0, C18:1n7t and CLA were observed in milk contaminated with S. uberis compared to healthy cows’ milk. It should be concluded that S. uberis causes the increase in total bacteria count, SCC and the decrease in κ-casein level, which significantly affects deterioration of technological quality of cows’ milk.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of udder infections with Staphylococcus xylosus and Staphylococcus warneri on the composition and physicochemical changes in cows milk
Autorzy:
Vasil, M.
Pecka-Kielb, E.
Elecko, J.
Zachwieja, A.
Zawadzki, W.
Zigo, F.
Illek, J.
Farkasova, Z.
Powiązania:
https://bibliotekanauki.pl/articles/32101.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
The aim of this study was an evaluation of the effects of two species of coagulase negative staphylococci (CNS), Staphylococcus xylosus and Staphylococcus warneri, on the changes in technological parameters of cows’ milk. The study was conducted in a herd of Slovak Pied cattle breed (with share of HF blood). Based on the performance results from three subsequent months, cows in the 2nd and 3rd lactation with SCC up to 200 thousand/ml (8 heads, 32 quarters), and above 800 thousand/ml (8 heads, 32 quarters), after the 4th month of lactation, were selected. The samples were subjected to microbiological analysis, total bacteria count, somatic cell count; basic milk composition and physicochemical properties were also examined. The research has found the impact of bacterial infection on the increasing (p<0.05) of the number of somatic cells and a decrease (p<0.01) in protein levels in milk due to both types of staphylococci. There was a significant (p<0.05) reduction in C8: 0, C10: 0 and the total amount of saturated fatty acids in the milk of the infected cows in comparison to the healthy ones. The research also revealed higher (p<0.01) levels of C14: 0 and C20: 1 in milk from the healthy cows.
Źródło:
Polish Journal of Veterinary Sciences; 2016, 19, 4
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 45

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