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Wyświetlanie 1-15 z 71
Tytuł:
Assessment of nitrous oxide emissions from agricultural soils at a local level in Poland
Autorzy:
Wiśniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/2082567.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
nitrous oxide
emission
agricultural soils
communes
Polska
Opis:
Nitrous oxide (N2O) is a very potent greenhouse gas whose concentration in the atmosphere is steadily increasing. Almost 80% of the annual N2O emissions in Poland originate from agriculture, and its main source is the use of agricultural soils. This study attempts to estimate the N2O emissions from agricultural soils and presents statistical analyses and spatial distributions for all Polish communes. For this purpose, a solution has been proposed which could be successfully applied by local government in order to assess N2O emissions, as well as to monitor the impact of actions undertaken to limit them. The annual N2O emissions from agricultural soils in Polish communes varies from 0.002 Mg N2O-N to 437.77 Mg N2O-N (with an average value of 21.13 Mg N2O-N and a standard deviation of 23.86 Mg N2O-N), and the cultivation of organic soils is its main source. The use of fertilizers and nitrogen fertilization with plant residues, as well as indirect emissions from nitrogen leaching, are also significant. The results may be used to provide a database for local governments, which will serve, not only to identify local emission sources related to agricultural soils, but also to properly plan and prioritize measures for its reduction.
Źródło:
International Agrophysics; 2019, 33, 3; 303-311
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnon Drag Effect on Resistivity and Thermoelectric Power of Semimetallic Antiferromagnet USb
Autorzy:
Henkie, Z.
Wiśniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1943936.pdf
Data publikacji:
1995-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Eb
72.20.Pa
75.50.Ee
72.15.Jf
Opis:
Resistivity ρ(T) and absolute thermoelectric power S(Τ) have been measured for USb single crystals characterized by different residual resistivity ratios, RRR = ρ(300 K)/ρ(4.2 K). A 50 μV/K peak of S(Τ) observed at 40 K for high RRR crystal vanishes for low RRR one. The ρ ∝ Τ$\text{}^{4}$ dependence observed below 40 K changes to the ρ ∝ Τ $\text{}^{5}\text{}^{/}\text{}^{2}$ one. These variations are ascribed to reduction of the magnon drag effect by an increased incoherent magnetic scattering of carriers, possibly induced by a small change of composition. Resistivity anomaly is analysed above the antiferromagnetic transition temperature T$\text{}_{N}$. We have found that resistivity decreases as tlnt in the range 0.02 ≤ t ≤ 0.35, where t = (Τ - T$\text{}_{N}$)/T$\text{}_{N}$. It is ascribed to a semimetallic character of this compound.
Źródło:
Acta Physica Polonica A; 1995, 88, 6; 1103-1112
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbon Footprint as a Tool for Local Planning of Low Carbon Economy in Poland
Ślad węglowy jako narzędzie w lokalnym planowaniu gospodarki niskoemisyjnej w Polsce
Autorzy:
Wiśniewski, P.
Kistowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813888.pdf
Data publikacji:
2017
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
carbon footprint
emission inventory
greenhouse gases
carbon dioxide equivalent
low carbon economy plans
ślad węglowy
inwentaryzacja emisji
gazy cieplarniane
ekwiwalent dwutlenku węgla
plany gospodarki niskoemisyjnej
Opis:
Based on the analysis of 48 local plans for a low carbon economy, adopted for implementation by randomly selected communes of various specificity, the assessment of the role and importance of carbon footprint as a tool in local planning of low carbon economy at local levels in Poland was carried out. The methodology of the inventory of greenhouse gas emissions applied in these documents was evaluated. On the basis of the results of the inventory of greenhouse gases presented in the studied plans, the estimation of carbon footprint was carried out for the individual municipalities, which was expressed in carbon dioxide equivalent. Furthermore, statistical and comparative analyzes were carried out. There were significant differences in the size of the carbon footprint in the individual municipalities and sectors, resulting mainly from the non-uniform methodological assumptions. Global values range from 17.3 thousand Mg CO2 eq/year to 436.4 thousand Mg CO2eq/year (with an average of 131.1 thousand Mg CO2eq/year and a standard deviation of 91.6 thousand Mg CO2eq/year), while per capita from 2.9 Mg CO2eq to 31.5 Mg CO2eq (with an average of 6.6 Mg CO2eq and a standard deviation of 4.5 Mg CO2eq). Having compared the size of the carbon footprint in the analyzed municipalities with the calculations carried out for the Starogard county, which is under a pilot program of low carbon development, as well as estimate values for Poland, presented in national and international reports on CO2 emissions, it was found that in most cases, the values are underestimated, which makes it difficult to identify the main sources of emissions and hence the implementation of effective low carbon policy at the local level in Poland. Keywords
W oparciu o analizę 48 lokalnych planów gospodarki niskoemisyjnej, przyjętych do realizacji przez losowo wybrane gminy o zróżnicowanej charakterystyce, dokonano oceny roli i znaczenia śladu węglowego jako narzędzia w planowaniu gospodarki niskoemisyjnej na poziomie lokalnym w Polsce. Ocenie poddano zastosowaną w tych dokumentach metodologię inwentaryzacji emisji gazów cieplarnianych. W oparciu o przedstawione w badanych planach wyniki inwentaryzacji gazów cieplarnianych, dokonano obliczeń śladu węglowego w poszczególnych gminach, wyrażonego w ekwiwalencie dwutlenku węgla. Przeprowadzono również analizy statystyczne i porównawcze. Stwierdzono znaczne zróżnicowanie wielkości śladu węglowego w poszczególnych gminach i sektorach, wynikające przede wszystkim z niejednolitych założeń metodologicznych. Wartości globalne wahają się od 17.3 tys. Mg CO2eq/rok do 436.4 tys. Mg CO2eq/rok (przy średniej 131.1 tys. Mg CO2eq/rok i odchyleniu standardowym 91.6 tys. Mg CO2eq/rok), natomiast per capita od 2.9 Mg CO2eq do 31.5 Mg CO2eq (przy średniej 6.6 Mg CO2eq i odchyleniu standardowym 4.5 Mg CO2eq). Z porównania wielkości śladu węglowego w analizowanych gminach z obliczeniami przeprowadzonymi dla powiatu starogardzkiego, objętego pilotażowym programem niskowęglowego rozwoju, a także szacunkowymi wielkościami dla Polski, prezentowanymi w krajowych i międzynarodowych raportach dotyczących emisji CO2, stwierdzono iż w większości przypadków są to wartości niedoszacowane, co utrudnia identyfikację głównych źródeł emisji oraz realizację skutecznej polityki niskowęglowej na poziomie lokalnym w Polsce.
Źródło:
Rocznik Ochrona Środowiska; 2017, Tom 19; 335-354
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Local Low Carbon Economy Plans in the Context of Low Carbon Rural Development
Autorzy:
Wiśniewski, P.
Kistowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/123920.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
low carbon economy plans
low carbon development
rural areas
rural communities
agriculture
Opis:
Based on the analysis of twenty plans for a low carbon economy, adopted for implementation by the rural municipalities of typical agricultural character, representing various Polish regions, the evaluation of the role and effectiveness of these documents in the planning and coordination of activities in favor of a low carbon rural development was carried out. Evaluated among others are the scope and extent of regard for agriculture and rural areas in the diagnostic and programming parts of plans, sources of financing and monitoring indicators of individual actions. Both the advantages and disadvantages of these documents were pointed out and recommendations for drawing them up were formulated. The proposals can be a model solution for the recognition of agriculture and rural areas in a low carbon economy plans prepared by local government units.
Źródło:
Journal of Ecological Engineering; 2016, 17, 4; 112-119
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extending DQL with Recursive Facilities
Autorzy:
Wiśniewski, P.
Burzańska, M.
Krukowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/106328.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
ORM
PHP
Doctrine
recursive queries
CTE
Opis:
Object Relational Mappings reduce a gap between Relational Databases and programming languages. However, only the simplest operations are covered by the ORM frameworks. Most facilities provided by DBMSs are not usable via ORM. Among such features are recursive queries, introduced in SQL:99 standard. This paper presents integration of Recursive Common Table Expressions with Doctrine Query Language - a part of Doctrine ORM framework for PHP.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2016, 16, 1; 12-20
1732-1360
2083-3628
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Transport Properties of Possibly Topologically Nontrivial Half-Heusler Bismuthides RMBi (R = Y, Gd, Dy, Ho, Lu; M = Pd, Pt)
Autorzy:
Pavlosiuk, O.
Kaczorowski, D.
Wiśniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1398607.pdf
Data publikacji:
2016-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.55.Ak
72.15.Eb
72.15.Jf
Opis:
High quality single crystals of some representatives of half-Heusler family were grown from Bi-flux. For single crystals characterization, X-ray diffraction and scanning electron microscopy techniques were used. The low-temperature physical properties of the synthesized crystals were determined by means of magnetization, magnetic susceptibility, electrical resistivity and heat capacity measurements. For each compound but LuPtBi, the electrical resistivity varies in a semimetallic manner at high temperatures, and exhibits a metallic character at low temperatures. LuPtBi is metallic in the whole temperature range studied. The bismuthides HoPdBi, LuPdBi, LuPtBi and YPtBi were found superconducting below the critical temperature $T_{c}$ = 0.7, 1.8, 0.9, and 0.96 K, respectively. For the compounds GdPdBi, DyPdBi and HoPdBi, an antiferromagnetic ordering was found to set in below $T_{N}$ = 12.8, 3.7, and 1.9 K, respectively. HoPdBi is thus an intriguing material in which both cooperative phenomena coexist.
Źródło:
Acta Physica Polonica A; 2016, 130, 2; 573-576
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Electronic Properties in Series of $GdT_{x}Ga_{4-x}$ Solid Solutions (T = Ni or Cu)
Autorzy:
Wiśniewski, P.
Gorzelniak, R.
Kaczorowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/1385707.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ee
72.15.-v
72.15.Jf
Opis:
We present results of extensive measurements of magnetic susceptibility, electrical resistance, specific heat and thermoelectric power of two series of solid solutions $GdNi_{x}Ga_{4-x}$ and $GdCu_{x}Ga_{4-x}$, for ranges of doping x from 0.6 to 1 and from 1 to 1.5, respectively. All studied phases display the Curie-Weiss behaviour of magnetic susceptibility and antiferromagnetic ordering at temperatures below 23 K. Substitution of gallium with transition metal atoms has strong influence on Néel temperatures of all studied phases, shifting them by few K, depending on x. Metamagnetic-like anomalies are observed for some compositions. Behaviour of the electrical resistivity reveals metallic nature of all samples. Their magnetic ordering is reflected in low-temperature anomalies of the resistivity and the heat capacity.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 382-384
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linear Control of Electro-hydraulic Injection Moulding Machine
Sterowanie liniowe elektrohydraulicznego napędu maszyny wtryskowej
Autorzy:
Wiśniewski, P.
Winnicki, A.
Wnuk, P.
Olszewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/154498.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
elektrohydrauliczny układ sterowania
ICON-HISIM
maszyna wtryskowa
electro-hydraulic control system
injection machines
Opis:
This paper presents the idea of a linear control strategy, simulation and experimental results represented by graphs. The results from the implementation of the proposed control algorithm with the use of a real machine are also shown.
W artykule przedstawiono: sposób działania liniowego algorytmu sterującego, wyniki symulacji i eksperymentów zostały przedstawione w postaci wykresów. Znajdują się tu również wyniki uzyskane w wyniku implementacji opracowanego algorytmu na rzeczywistej maszynie wtryskowej.
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 3, 3; 178-182
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antiferromagnetic order in the half-Heusler phase TbPdBi
Autorzy:
Pavlosiuk, O.
Kleinert, M.
Wiśniewski, P.
Kaczorowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/1047687.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Ee
75.80.+q
71.55.Ak
72.15.Eb
Opis:
Single crystals of TbPdBi, a representative of the group of half-Heusler bismuthides, were studied by means of magnetic susceptibility, heat capacity, electrical resistivity, magnetostriction and thermal expansion measurements. The compound was characterized as an antiferromagnet with the Néel temperature T_{N} ≈5.3 K. Neutron diffraction experiment confirmed the antiferromagnetic ordering and yielded the propagation vector k=(1/2,1/2,1/2). Remarkably, this k vector is in accord with the recently developed theory of antiferromagnetic topological insulators.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 498-500
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing the Lightweight Ceramic Proppants Properties
Autorzy:
Wisniewski, P.
Szymanska, J.
Malek, M.
Mizera, J.
Powiązania:
https://bibliotekanauki.pl/articles/1187431.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.-n
Opis:
The paper presents results of sintering proppants parameters and its influence on light ceramic proppants obtained by the mechanical granulation method. The proppants were prepared basing on a ceramic composition consisting of three raw materials such as kaolin, clay and bauxite mixed with poly(vinyl alcohol) binder with a molecular weight 26000 g/mol and hydrolysis degree of 88%, added in amount of 5 wt% with respect to the powder. Sintering temperature range oscillated between 1200 and 1225°C, kiln rotations were 1-2 rpm. Sintered proppants were characterized in compliance with PN-EN ISO 13503-2 norm and bulk density, sphericity coefficient, turbidity, solubility in acids and scanning electron microscopy observations have been estimated. The results demonstrated that sintering temperature and kiln rotation have an essential effect of the proppants parameters.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 501-503
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Interference in Disordered Ferromagnet U₂NiSi₃
Autorzy:
Gnida, D.
Szlawska, M.
Wiśniewski, P.
Kaczorowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/1386551.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.-v
75.50.Lk
72.15.Rn
Opis:
A single-crystalline sample of disordered ferromagnetic U₂NiSi₃ was investigated by means of electrical resistivity measurements under ambient and high hydrostatic pressure. Temperature dependences of the electrical resistivity clearly reveal interplay of the ferromagnetic ordering and quantum interference effects resulting from crystallographic disorder. Electron-electron interaction manifests itself as a $T^{0.5}$ increase in the in-plane and out-of-plane electrical resistivity below 5 K. Weak localization is observed solely in the ab-plane as a linear-in-T contribution to resistivity, which suggests that internal magnetic field does not break the interference of scattered electron waves in ab-plane. Applied hydrostatic pressure does not affect the $T^{0.5}$ electron-electron interaction contribution, however it diminishes the impact of weak localization on the ab-plane resistivity.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 451-453
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Order and SdH Effect in Half-Heusler Phase ErPdBi
Autorzy:
Pavlosiuk, O.
Filar, K.
Wiśniewski, P.
Kaczorowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/1388106.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.10.+v
75.40.Cx
71.18.+y
71.20.Eh
72.15.Gd
Opis:
Single crystals of ErPdBi were grown from Bi-flux. The crystal structure of MgAgAs-type was confirmed using X-ray diffraction. Magnetization, magnetic susceptibility, electrical resistance and heat capacity measurements revealed an antiferromagnetic phase transition at $T_{N}$ = 1.2 K. At high temperatures, the electrical resistance has a semiconducting-like character (dR/dT < 0 ). The resistance starts decreasing with decreasing T below 15 K and shows a very sharp drop below $T_{N}$ but remains finite down to 0.4 K. Hence, no obvious evidence of superconductivity was found in the electrical transport data. On the other hand, the real part of AC magnetic susceptibility is negative below $T_{C}$ = 1.6 K and its imaginary component has a clear maximum at this temperature that might be associated with the onset of superconducting state. The electrical resistance revealed Shubnikov-de Haas oscillations in magnetic fields 8-33 T. Their amplitude decreases with increasing T and disappears above 10 K. Cyclotron mass determined from this dependence is 0.21 $m_{e}$.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 656-658
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-Field Magnetisation and Magnetoresistance οf $U_3P_4$ and Its Solid Solution $U_3(P,As)_4$
Autorzy:
Wiśniewski, P.
Kozlova, N.
Freudenberger, J.
Henkie, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1810506.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Gd
75.50.Cc
75.60.Ej
Opis:
Magnetisation and longitudinal magnetoresistance of single-crystal samples of two compositions: stoichiometric compound $U_3P_4$ and its solid solution $U_3(P,As)_4$ (with As:P ratio close to 1) were measured in pulsed magnetic fields with strength up to 47 T, and in temperatures from 4 K up to few tens of kelvins above the Curie temperatures (135 K and 181 K for both compositions, respectively). Field was always applied along a hard magnetic direction [100]. Magnetisation experiments showed no sign of expected magnetic-moment-reorientation transition and data look quantitatively similar for both compositions. On the other hand, longitudinal magnetoresistance (MR) is remarkably different for each composition. Onset of the above mentioned transition can be held responsible for broad maxima observed in MR(B) curves for $U_3(P,As)_4$. Values of magnetic field strength corresponding to these maxima follow a linear dependence on temperature. We assume that these features of MR(B) curves are due to progressive deformation of magnetic structure of $U_3(P,As)_4$ in high magnetic fields.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 254-256
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From the heap to the park - reclamation and adaptation of degraded urban areas for recreational functions in Poland
Autorzy:
Lukaszewicz, J.
Fortuna-Antoszkiewicz, B.
Dlugonski, A.
Wisniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/887391.pdf
Data publikacji:
2019
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Scientific Review Engineering and Environmental Sciences; 2019, 28, 4[86]
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Giant Magnetoresistance and Shubnikov-de Haas Effect in LuSb
Autorzy:
Kleinert, M.
Pavlosiuk, O.
Swatek, P.
Kaczorowski, D.
Wiśniewski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1030528.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Eh
71.55.Ak
72.15.Eb
Opis:
Single-crystals of LuSb were investigated by means of electrical resistivity and magnetoresistance measurements. The compound was found to exhibit giant magnetoresistance exceeding 3000%, low-temperature resistivity plateau, and Shubnikov-de Haas oscillations. It was characterized as a semimetal with nearly balanced contributions of electron and hole carriers to the magnetotransport properties. The experimental findings, supported by the results of electronic structure calculations, proved that the magnetotransport in LuSb can be described in the scope of 3D multi-band Fermi surface model without topologically non-trivial electronic states.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 538-540
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 71

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