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001-es BibID:BIBFORM058734
Első szerző:Centeri Csaba
Cím:Comparison of particle-size analyzing laboratory methods / Centeri Csaba, Jakab Gergely, Szabó Szilárd, Farsang Andrea, Barta Károly, Szalai Zoltán, Bíró Zsolt
Dátum:2015
ISSN:1582-9596 1843-3707
Megjegyzések:Particle size distribution is one of the most influential factors of most soil physical and even some soil chemical characteristics. As modern measurement techniques are being introduced, the need for comparing new methods with older methodologies arises because comparability means data continuity. Here, three institutes conducted a comparison of particle size measurement among the laser, areometer and pipette techniques. The purpose of the comparison was to a) discover any differences among operators, laboratories, and techniques; b) identify if there were any differences and if they could be linked to soil type (e.g. high clay, loam, or sand content) or particle size range; and c) understand if the laser diffraction method gave results that were significantlylarger than the other methods of any size fraction. There was no statistically proven difference between the two operators examined based on the pipette method's result. The comparison of two of the institutes' pipette methods showed statistically significant differences for three of the eight samples tested. However, these differences only seemed to appear in the 0.01 mm to 0.02 mm particle size range. A technical comparison among all three methods resulted in significantdifferences in all cases except for one sample that had very high sand content and very low clay content. Finally, the laser diffraction method was analyzed to see if it measured a larger amount of the clay fraction, however, it instead overestimated the silt and the finesand (0.01 mm to 0.02 mm) fraction, not the clay fraction. Therefore, we conclude that different methodologies can providesignificant difference in particle-size measurement. Based on the results, we recommend creating a widely accepted patent for sample preparation (disaggregation,the use of peroxide or other agents, using ultrasonic or other methods) and for measuring techniques (a set of refractive and sorption indexes, using ultrasonic during the measurement, pump speed etc.).
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
areometer
laser diffractometry
pipette method
soil fractions
Megjelenés:Environmental Engineering and Management Journal. - 14 : 5 (2015), p. 1125-1135. -
További szerzők:Jakab Gergely Szabó Szilárd (1974-) (geográfus) Farsang Andrea (1967-2022) (geográfus) Barta Károly Szalai Zoltán Bíró Zsolt
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2.

001-es BibID:BIBFORM063079
Első szerző:Szabó György (geográfus, egyetemi tanár)
Cím:The carbon footprint of a biogas power plant / György Szabó, István Fazekas, Szilárd Szabó, Gergely Szabó, Tamás Buday, Mónika Paládi, Krisztián Kisari, Attila Kerényi
Dátum:2014
ISSN:1582-9596
Megjegyzések:In our study, we examined the annual carbon footprint and energy balance of a Hungarian biogas power plant with a power output of 0.637 MW in 2013, with reference to the complete life cycle of the biogas production. The life cycle analysis (LCA) considered the emissions of greenhouse gases (GHG) during the production of feedstock and its transportation into the power plant, during the operation of the factory and during the process of rendering the discarded waste materials harmless. We established that the highest GHG emissions related to the feedstock production in which both the use of machines and N2O release from the use of artificial fertilizers played an important role. In 2013, the power plant produced 4347.21 MWh electric power and 4607.89 MWh thermal energy. The carbon footprint of the complete energy production life cycle was 208173 kg CO2 equivalents (CO2e). If the regular Hungarian energy structure produced such a quantity of energy, GHG emissions would be 15 times higher. Therefore, the energy balance of the power plant is positive; in contrast to its 8955.10 MWh energy production, its energy requirements were merely 2720.26 MWh, of which 1520.60 MWh as thermal energy served to heat the digesters. Unfortunately, more than 50% of the produced thermal energy is currently wasted; therefore, in the future, it is important to find a solution for the proper utilization of this valuable energy.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
biogas
carbon footprint
energy balance
greenhouse gas emission
life cycle analysis
Megjelenés:Environmental Engineering and Management Journal. - 13 : 11 (2014), p. 2867-2874. -
További szerzők:Fazekas István (1973-) (geográfus) Szabó Szilárd (1974-) (geográfus) Szabó Gergely (1975-) (geográfus) Buday Tamás (1982-) (geográfus) Paládi Mónika (1987-) (geográfus) Kisari Krisztián (1986-) (energetikai mérnök, közgazdász) Kerényi Attila (1943-2023) (geográfus)
Pályázati támogatás:TÁMOP-4.2.2.A-11/1/KONV-2012-0041
TÁMOP
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3.

001-es BibID:BIBFORM060259
Első szerző:Szabó Szilárd (geográfus)
Cím:Testing of algorithms for the identification of asbestos roofing based on hyperspectral data / Szabó Szilárd, Burai Péter, Kovács Zoltán, Szabó György, Kerényi Attila, Fazekas István, Paládi Mónika, Buday Tamás, Szabó Gergely
Dátum:2014
Megjegyzések:There are several environmental issues in urban areas that are caused by the unintentional consequences of past activities. One of these issues is the wide application of asbestos cement in roofing materials in the 2nd half of the 1900s. In this study, our goal was to identify different roof types and to determine those with asbestos components using high-ground (1 m) and spectral (126 bands) resolution airborne hyperspectral imagery (AISA Eagle II) and several classification approaches. In addition, we aimed to identify those wavelengths that play a significant role in distinguishing the different roof types. In the image analysis, the SAM,MLC and SVM classification methods were used to evaluate the different types of roofs. These methods resulted in accurate maps of the roof types, and asbestos cement roofs were identified with over 85% accuracy.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
Aisa EAGLE
asbestos-cement
hyperspectral remote sensing
image classification
roofs
Megjelenés:Environmental Engineering and Management Journal. - 143 : 11 (2014), p. 2875-2880. -
További szerzők:Burai Péter (1977-) (agrármérnök) Kovács Zoltán (1988-) (geográfus) Szabó György (1964-) (geográfus, egyetemi tanár) Kerényi Attila (1943-2023) (geográfus) Fazekas István (1973-) (geográfus) Paládi Mónika (1987-) (geográfus) Buday Tamás (1982-) (geográfus) Szabó Gergely (1975-) (geográfus)
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4.

001-es BibID:BIBFORM060900
Első szerző:Szegedi Sándor (klimatológus)
Cím:Role of urban morphology in development of the thermal exess in the city of Debrecen, Hungary / Sándor Szegedi, Tamás Tóth, István Lázár
Dátum:2014
ISSN:1582-9596 1843-3707
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Environmental Engineering and Management Journal. - 13 : 11 (2014), p. 2805-2808. -
További szerzők:Tóth Tamás (1982-) (klimatológus) Lázár István (1986-) (geográfus)
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5.

001-es BibID:BIBFORM056580
Első szerző:Verbai Zoltán (gépészmérnök, épületgépész)
Cím:Heating degree day in Hungary / Zoltán Verbai, István Lázár, Ferenc Kalmár
Dátum:2014
ISSN:1582-9596 1843-3707
Megjegyzések:In Central European countries, heating represents approximately 75% of the total energy use of a residential building, with average thermal characteristics of the envelope. The expected energy use can be determined using complex simulation programs, but an easier way is to use specific degree day values. Degree da y values should be calc ulated as precisely as possible. At pre sent in Hungary, the degree day values that are used for simplified energy calculations were dete rmined several decades ago. The aim of our research was to determine the degree day values based on the last 60 years for different Hungarian settlements. Using the CarpathClim database and elaborating the degree day values for 25 Hungarian cities, differen ces of 10% have been found compared with the values used previously for energy calculations.
Tárgyszavak:Műszaki tudományok Gépészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Environmental Engineering and Management Journal. - 13 : 11 (2014), p. 2887-2892. -
További szerzők:Lázár István (1986-) (geográfus) Kalmár Ferenc (1974-) (gépészmérnök)
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