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Wyświetlanie 1-10 z 17
Tytuł:
Fertilizer recommendations-environmental aspects
Autorzy:
Nemeth, T
Tematy:
nitrogen
fertilization
fertilizer
potassium
environmental aspect
long-term effect
soil chemical process
phosphorus
soil physical process
water balance
Pokaż więcej
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:
https://bibliotekanauki.pl/articles/797283.pdf  Link otwiera się w nowym oknie
Opis:
The author presents the main frame of a recommendation system worked out in RISSAC in the last years. The basis of this system is a description of the main processes in the soils, i.e., water balances, soil physical and chemical processes. The author also presents some data about the environmental effects of intensive land use.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of rock phosphates in sustainable agriculture: the Hungarian experience with Algerian rock phosphate
Autorzy:
Nemeth, T.
Csatho, P.
Osztoics, E.
Tematy:
rock phosphate
sustainable agriculture
Hungary
agriculture
fertilization
nutrient balance
phosphate
soil
plant nutrient
superphosphate
Pokaż więcej
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:
https://bibliotekanauki.pl/articles/801085.pdf  Link otwiera się w nowym oknie
Opis:
From the early 60's till the late 80's, in many countries - among them also in Hungary - agricultural production went through a tremendous development. In Hungary there was a 2-3-fold increase in the average yields of winter wheat, and maize - the two main crops - in comparison to those of the 50's. One of the main factors determining these developments was the increasing use of mineral fertilizers. From the turn of the century till the late 50's, nutrient balances in Hungary were strongly negative: 20 - 30 kg/ha/year less N and K₂O, and 10 kg/ha/year less P₂O₅ was given to the fields in the different forms (farmyard manure, mineral fertilizer and by-products, etc.), than was removed by the harvested yields. Nutrient balances of P became positive in the early 60's, while balances of N and K in the early 70's, resp. Then, for 20 years, N balances were positive by 10 - 20 kg/ha/year, while both P₂O₅ and K₂O balances by 30 - 50 kg/ha/year, resp. These long-term positive nutrient balances resulted in the NPK enrichment of our soils, which was also proven by the national soil test series. During the 80's, for example, the amount of yearly applied mineral fertilizer was 230 - 280 kg/ha N + P₂O₅ + K₂O/arable land. In certain regions N leaching could cause environmental damage, while, as a result of the P-Zn antagonism, on the fields poorly supplied with Zn, overfertilization with P resulted in 1 - 2 t/ha/year maize yield losses. From the early 90's, however, when political and ecological changes took place in the country, the free market was introduced, and state subsidies on mineral fertilizer were withdrawn, there was a sharp decrease in mineral fertilizer use: applied N dropped to 1/5th, P and K to 1/20th of the amount used in the 80's. This dramatic decrease resulted in the change of nutrient balances: in 1991 the balance for N was -60, for P₂O₅ -30, and for K₂O -40 kg/ha for the whole country, resp. In 1992 and 1993 the situation was similar, while in 1994 a slight increase in mineral fertilizer use was observed. According to our estimation, mineral fertilization of 150 kg/ha/year N + P₂O₅ + K₂O is sufficient for long-term sustainable plant nutrition in Hungary, if farmyard manure application and the incorporation of byproducts remains on the recent level. During intensive fertilization practice, emphasis was on the quantity, while crop and soil demands for specific or more economic fertilizers were not taken into consideration. For N, lime ammonium nitrate, for P superphosphate, and for K, potash chloride was used on almost the whole area. As a new attempt to find more economic P sources, Algerian rock phosphate was checked in field trials, set up on characteristic acidic soils in different regions of Hungary, as well as other Central European countries. The first two-year results are discussed in the presentation.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of soil acidification on heavy metal concentrations in the soil solution
Autorzy:
Csillag, J.
Lukacs, A.
Bujtas, K.
Nemeth, T.
Tematy:
soil acidification
heavy metal concentration
soil solution
soil contamination
toxic metal
agricultural land
soil
Pokaż więcej
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:
https://bibliotekanauki.pl/articles/802549.pdf  Link otwiera się w nowym oknie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonlinear analysis of vehicle control actuations based on controlled invariant sets
Autorzy:
Németh, B.
Gáspár, P.
Péni, T.
Tematy:
vehicle dynamics
sum of squares programming
Lyapunov method
dynamika pojazdu
metoda Lapunowa
analiza nieliniowa
Pokaż więcej
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:
https://bibliotekanauki.pl/articles/331245.pdf  Link otwiera się w nowym oknie
Opis:
In the paper, an analysis method is applied to the lateral stabilization problem of vehicle systems. The aim is to find the largest state-space region in which the lateral stability of the vehicle can be guaranteed by the peak-bounded control input. In the analysis, the nonlinear polynomial sum-of-squares programming method is applied. A practical computation technique is developed to calculate the maximum controlled invariant set of the system. The method calculates the maximum controlled invariant sets of the steering and braking control systems at various velocities and road conditions. Illustration examples show that, depending on the environments, different vehicle dynamic regions can be reached and stabilized by these controllers. The results can be applied to the theoretical basis of their interventions into the vehicle control system.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radon and thoron parallel measurements in dwellings nearby a closed Hungarian uranium mine
Autorzy:
Németh, C.
Jobbágy, V.
Kávási, N.
Somlai, J.
Kovács, T.
Tokonami, S.
Tematy:
radon
thoron
dwelling
Pokaż więcej
Wydawca:
Instytut Chemii i Techniki Jądrowej
Powiązania:
https://bibliotekanauki.pl/articles/148705.pdf  Link otwiera się w nowym oknie
Opis:
Integrated measurements of radon (222Rn) and thoron (220Rn) were executed in a Hungarian village, located in the vicinity of an abandoned uranium mine. The applied passive radon and thoron monitor was the RADUET which is based on a CR-39 track detector. The investigated 35 houses were one storey buildings made of bricks. The rock under the village is a gray-sandstone with an average of 136 and 77 Bqźkg–1 uranium and thorium, respectively. The detectors were mostly placed in the inhabited areas of the houses, such as bedrooms and living-rooms, at a height of 1–1.5 m close to the wall. The measurement periods were between December 2006 and May 2007 and between May 2007 and February 2008. Annual averages of radon concentrations were calculated applying seasonal correction factors to the results of the two measurement periods. The results show that the radon concentrations in the case of considerable part of the investigated dwellings seems to be significantly higher than the Hungarian averages for ground-floor houses (152 Bqźm–3). The thoron concentrations in some cases are also not negligible indicating that radon measurements which are sensitive to thoron can be misleading. Additionally, thoron can also be a contributor of extra dose.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-ray spectroscopy station for sample characterization at ELI Beamlines
Autorzy:
Zymaková, A.
Zymak, I
Vankó, G.
Z. Németh
Błachucki, W.
Andreasson, J.
Szlachetko, Jakub
T. Wiste
Picchiotti, A.
Sá, J.
Precek, M.
Opis:
X-ray spectroscopy is a demanded tool across multiple user communities. Here we report on a new station for X-ray emission spectroscopy at the Extreme Light Infrastructure Beamlines Facility. The instrument utilizes the von Hamos geometry and works with a number of different sample types, notably including liquid systems. We demonstrate a simple and reliable method for source position control using two cameras. This approach addresses energy calibration dependence on sample position, which is a characteristic source of measurement uncertainty for wavelength dispersive spectrometers in XES arrangement. We also present a straightforward procedure for energy calibration of liquid and powder samples to a thin film reference. The developed instrumentation enabled us to perform the first experimental determination of the Kα lines of liquidized K3Fe(CN)6 as well as powdered and liquidized FeNH4(SO4)2. Finally, we report on proof-of-principle use of a colliding jet liquid sample delivery system in an XES experiment.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Preliminary photometric results for the 2003 eclipse of EE Cep
Autorzy:
Apostolovska, G.
Bilkina, B.
Cikala, M.
Gere, B.
Hajduk, M.
Kolev, D.
Bellas-Velidis, L.
Drahus, Michał
Mikolajewski, M.
Waniak, Wacław
Tomov, T.
Kolaczkowski, Z.
Majcher, A.
Semkov, E.
Winiarski, Maciej
Csak, B.
Majewska, A.
Siwak, Michał
Kurpińska-Winiarska, Maria
Gazeas, K.
Graczyk, D.
Nemeth, P.
Dimitrov, D.
Pigulski, A.
Galan, C.
Gromadzki, M.
Osiwala, J.
Zoła, Stanisław
Niarchos, P.
Michalska, G.
Dapergolas, A.
Zajczyk, A.
Opis:
We report multicolour photometric observations of the 2003 eclipse of the long-period (5.6 yr) eclipsing binary EE Cep. Measurements were obtained with ten telescopes at eight observatories in four countries. In most cases, UBV(RI)C broad band filters have been used. The light curve shape shows that the obscuring body is an almost dark disk around a low-luminosity central object. However, variations of the colour indices during the eclipse indicate that the obscuring body emits a considerable amount of radiation in the near infrared.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 17

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