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Wyświetlanie 1-15 z 61
Tytuł:
The airborne radioactivity and electrical properties of ground level air
Autorzy:
Mysłek-Laurikainen, B.
Matul, M.
Mikołajewski, S.
Trzaskowska, H.
Kubicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/148122.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
aerosols
air monitoring
radioelectricity
radionuclides
Opis:
The data presented in this work are the result of systematic measurements of radionuclide concentrations in air, collected with an ASS-500 high volume air sampler of the ground air monitoring network supervised by the Central Laboratory of Radiological Protection. Sampling has been done since March 1991. Simultaneously, the routine complex meteorological observations were performed. In particular, the electrical properties of ground level atmospheric air were studied with measurements of electrical field intensity, positive and negative conductivity of air and density of vertical current. The airborne 7Be concentration changes similarly to the electrical conductivity of air, while other isotopes, antropogenic or originating from the ground are correlated with dust and other meteorological factors like watering and wind.
Źródło:
Nukleonika; 2001, 46, 4; 195-197
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radionuclides in ground-level air and deposits near the Ignalina NPP
Autorzy:
Jasiulionis, R.
Savickaite, I.
Powiązania:
https://bibliotekanauki.pl/articles/148108.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
atmosphere
environment of Ignalina NPP
numerical models
radionuclide
water-insoluble fractions
water-soluble fractions
Opis:
Abstract Results of systematic measurements of radionuclide activity concentrations in the air and deposits from January 1997 to July 2000 near the Ignalina Nuclear Power Plant (hereafter detoted as NPP) are presented. The data on NPP produced radionuclides 60Co and 54Mn in deposits and results of calculation are used for establishment of their distribution near NPP. Water-soluble and water-insoluble radionuclide fractions in the airborne effluents of NPP were investigated. The possibility to evaluate the deposition factor of water-soluble and water-insoluble radionuclides from the NPP jet by comparing the experimental data in the NPP stack and the environment is shown.
Źródło:
Nukleonika; 2001, 46, 4; 183-187
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of plutonium isotopes in ground-level air in Northern-Germany - history and recent results
Autorzy:
Wershofen, H.
Arnold, D.
Steinkopff, T.
Powiązania:
https://bibliotekanauki.pl/articles/148061.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
caesium
environmental monitoring
ground-level aerosols
plutonium
radioactivity
Opis:
The history of plutonium measurements performed on ground-level aerosols is summarised. Recent results are presented, the activity ratios a((239+240)Pu)/a(137Cs) and a(238Pu)/a((239+240)Pu) measured are discussed and potential sources of 238Pu are considered.
Źródło:
Nukleonika; 2001, 46, 4; 155-159
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radioactivity of ground-level air in Poland in 1998-1999. Results from ASS-500 stations network
Autorzy:
Bysiek, M.
Biernacka, M.
Lipiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/148059.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
air
high-volume samplers
radionuclides
Opis:
The results of measurements of aerosol samples in the 1998-1999 period in the monitoring network of the ASS-500 stations in Poland are presented. The concentration of 137Cs remained at a rather low level during these two years. Higher levels resulting from the Algeciras release in southern Spain were identified in the first week of June 1998 at four stations situated in southern Poland. Higher concentrations of 137Cs were also observed during some other weeks of the presented period, but their origin has not been identified. The radionuclides of natural and antrophogenic origin were at their normal levels of activity. For comparison, the results from some other European stations are presented.
Źródło:
Nukleonika; 2001, 46, 4; 171-173
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the coal combustion input to the 226Ra ground-level air concentration in the Lodz city, Poland
Autorzy:
Bem, H.
Olszewski, M.
Bysiek, M.
Gluba, T.
Powiązania:
https://bibliotekanauki.pl/articles/147322.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
226Ra concentration in air
gamma spectrometry
fly ash
Opis:
The network of high volume aerosol samplers type ASS-500 in Poland, established mainly for monitoring radionuclides of artificial origin, offers also a unique opportunity for measuring natural radionuclide concentrations in ground-level air. Recounting of the closed (sealed) filters after a one month period, necessary for establishing radioactive equilibrium between 226Ra and 222Rn, as well as its short-lived decay products, remarkably improves the accuracy of 226Ra determination. The Currie's average detection and determination limits (with 10% relative accuracy) calculated for 226Ra for 160,000 s counting time and combined with the average filtered air volume of 60,000 m3 were 0.3 and 1.2 mi Bq/m3, respectively. The observed 226Ra concentrations in air in Lodz during the half year collection period, including parts of winter and summer seasons, were always above the detection limit and ranged from 0.76 to 2.75 mi Bq/m3. 226Ra, present in the ground level air mainly as a result of resuspension from the top layer of soil and fly ash emissions from coal burning, was used for rough estimation of the contribution of the coal combustion to the total suspended particulate matter. On the basis of available data for 226Ra content in the soil and fly ashes for the Lodz region of Poland, the calculated coal combustion input to the total air suspended particulate matter ranged from 8 to 39%.
Źródło:
Nukleonika; 2004, 49, 4; 167-171
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cosmogenic 22Na and 7Be in ground level air
22Na i 7Be w przyziemnej warstwie atmosfery
Autorzy:
Grabowska, S.
Mietelski, J.
Powiązania:
https://bibliotekanauki.pl/articles/340706.pdf
Data publikacji:
2004
Wydawca:
Główny Instytut Górnictwa
Tematy:
izotopy kosmogeniczne
skażenie promieniotwórcze atmosfery
gamma emiter
detektor HPGe
cosmogenic radionuclides
atmosphere radioactive contamination
HPGe detector
Źródło:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa; 2004, 1; 81-82
1643-7608
Pojawia się w:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of radium 226Ra nuclide in ground-level air
Pomiary stężenia radu 226Ra w warstwie przypowierzchniowej atmosfery
Autorzy:
Bem, H.
Olszewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/340763.pdf
Data publikacji:
2004
Wydawca:
Główny Instytut Górnictwa
Tematy:
automatyczna stacja pomiarowa ASS
spektrometria gamma
stężenie radu
Aerosol Sampling Station ASS
gamma spectrometry
radium concentration
Źródło:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa; 2004, 1; 95-96
1643-7608
Pojawia się w:
Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Usefulness of Measurement on a Board at Ground Level for Assessing the Noise Level from a Wind Turbine
Autorzy:
Wszołek, Tadeusz
Pawlik, Paweł
Mleczko, Dominik
Chronowska, Jagna
Powiązania:
https://bibliotekanauki.pl/articles/176301.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
wind turbine noise
amplitude modulation
acoustical measurements
environmental acoustics
Opis:
The specific working conditions of the wind turbine in strong wind cause a number of problems in the measurement of noise indicators used in its short and long-term assessment. The wind is a natural working environment of the turbine, but it also affects the measurement system, moreover, it can be a secondary source of other sounds that interfere with the measurement. One of the effective methods of eliminating the direct impact of wind on the measurement system is placing the microphone on the measurement board at ground level. However, the obtained result can not be directly compared with the admissible values, as it has to be converted to a result at a height of 4 m. The results of previous studies show that this relation depends, inter alia, on the speed and direction of the wind. The paper contains the results of measurements on the measurement board, according to EN 61400-11:2013, and at a height of 4 m above ground made simultaneously in three points around the 2 MW turbine at various instantaneous speeds and changing wind directions. Analysis of the impact of measuring point location on the measurement result of noise indicators and the occurrence of additional features affecting the relationship between the values measured on the board and at the height of 4 m, and especially the tonality, amplitude modulation and content of low frequency content, was made.
Źródło:
Archives of Acoustics; 2020, 45, 1; 165-175
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Ground Ozone Level under the Physiological Strain Conditions
Autorzy:
Sobolewski, R. K.
Kalbarczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/123691.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
air pollution
thermal strain
bioclimate
urban climate
Opis:
Urban areas are characterised by the impact of negative environmental factors, such as: stress connected with extreme bio-thermal conditions or the presence of high concentrations of air pollutants. This study aims to evaluate the relationship between the hours of O3 concentrations and the levels of physiological strain (PhS) in Legnica, during the period from December 2013 to November 2014. The hourly concentrations of O3, NO2 and meteorological elements used in the study were obtained from the State Environmental Monitoring station in Legnica (Lower Silesia). The evaluation of the bio-thermal conditions was carried out by means of the physiological strain indicator (PhS). The basic statistics were subject to analysis, the frequency of hourly pollution concentrations and the thermal strain were evaluated, as was the Pearson correlation coefficient and multiple regression between O3 and PhS. A detailed analysis was carried out for the summer months (June-August). The most adverse conditions in terms of pollution with tropospheric ozone and heat strain were noted in July. The strongest relations between O3 and PhS were observed in June. In winter months (December-February) no significant dependencies were noted between the tested variables. These tests will help to contribute to increasing the current knowledge on evaluating the thermal comfort of urbanised areas and the accompanying aero-sanitary conditions.
Źródło:
Journal of Ecological Engineering; 2018, 19, 4; 207-216
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Above and Below-Ground Decomposition of Leaf Litter in Leucaena leucocaephala Plantation of Federal University of Agriculture, Abeokuta (FUNAAB), Nigeria
Autorzy:
Oladoye, A. O.
Oyebamiji, N. A.
Ayoku, Y. B.
Powiązania:
https://bibliotekanauki.pl/articles/1077278.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Forest plantation
Leucaena leucocaephala
ground level
leaf litter
mass loss
nutrient contents
release pattern
Opis:
A decomposition study was carried out on the leaf litters of Leucaena leucocaephala to determine the rate of decomposition of its leaves with respect to its placement on above or below the ground levels in L. leucocaephala plantations of the Federal University of Agriculture, Abeokuta, Nigeria. In the study, leaf litter were randomly handpicked from the forest floor, of this, 40 g each were weighed into thirty (30) litter bags of 2 mm mesh size in which 15 were randomly placed on the forest floor (above-ground) and the remaining 15 were buried in the soil between 5-10 cm depth (below-ground). Data were analysed using descriptive statistical techniques such as percentage, while inferential statistics (simple linear regression) was used to determine relationships between various nutrient elements and days of decomposition (DOD). We noted that the percentage of mass loss of leaf litter increased with time in days after deposit and was higher (29.93%, 32.43 % and 33.25%, 41.65%) at 80 to 100 days of placement above- and below-ground, respectively. Moreover, the exchangeable basic cations and chemical compositions of litters were not consistent with respect to DOD. Regression analysis of nitrogen (N) and organic carbon (OC) showed that these elements significantly contributed to the high (86 %) overall decomposition of litter (p < 0.05, p < 0.01) below-ground level. It is, therefore, concluded that decomposition of leaf litters occur faster below ground than above ground within the forest plantation.
Źródło:
World News of Natural Sciences; 2019, 23; 211-220
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ozon w przygruntowej warstwie troposfery i jego wpływ na rośliny polskich parków narodowych
Ground level ozone concentration and its effect on plants of Polish national parks
Autorzy:
Godzik, Barbara
Grodzińska, Krystyna
Powiązania:
https://bibliotekanauki.pl/articles/1201776.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Przyrodników im. Kopernika
Opis:
Ozone concentrations were determined during the 1997-1999 growing seasons in 26 forest sites of the Carpathian Mountains using passive samplers (Ogawa & Co, Pompano Beach, FL, USA). In addition, in two western Carpathian sites ozone was continuously monitored (UV O3 Thermo Environmental Model 49C). Highest hourly ozone concentrations reached 160 and 200 μg m-3 ; ozone concentrations fluctuated over the whole growing seasons between 40 and 100 μg m-3 and showed significant differences between individual monitoring years, monitoring periods and geographic location of the sites. The highest ozone concentrations appeared in Western Carpathians. In the Tatra Mountains (18 forest sites in Polish and Slovak parts) ozone concentrations fluctuated over the whole season between 65 and 122 μg m-3 , average monthly concentrations reached 100 μg m-3 , and the highest 1-hour concentrations were close to 200 μg m-3 . The sites equipped with active monitors showed different patterns of diurnal ozone distribution. The results of studies show that high ozone concentrations appeared in many parts of the Carpathian range, and potential phytotoxic effects of ozone on forest stands (trees, herb layer) can be expected to appear on almost the entire territory of the Carpathian Mountains. The following species showed ozone-like injury symptoms: Pinus cembra, Sorbus aucuparia, Corylus avellana, Sambucus racemosa, Ranunculus repens and R. lanuginosus, Senecio subalpinus, Vaccinium myrtillus, Gentiana asclepiadea, Centaurea jacea, Impatiens parviflora.
Źródło:
Kosmos; 2002, 51, 4; 427-434
0023-4249
Pojawia się w:
Kosmos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ozone concentration in ground-level air layer in north-western Poland - The role of meteorological elements
Stezenie ozonu w przyziemnej warstwie powietrza w polnocno-zachodniej Polsce - rola elementow meteorologicznych
Autorzy:
Kalbarczyk, R
Kalbarczyk, E.
Powiązania:
https://bibliotekanauki.pl/articles/81591.pdf
Data publikacji:
2009
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2009, 41, 1
0208-5771
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of regularities of ground-level air radionuclide contamination at the Russian coast of the Baltic Sea in the course of the long-term Leningrad Nuclear Power Plant (1983-1999) operation
Autorzy:
Blinova, L.
Goloubeva, L.
Dushin, V.
Michurina, T.
Powiązania:
https://bibliotekanauki.pl/articles/148106.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
air contamination
artificial radionuclides
7Be
nuclear power plant
Opis:
Long-term results of ground-level air radionuclide contamination at the Russian coast of the Baltic Sea (nuclear facilities in the vicinity of the town of Sosnovy Bor) are under consideration. As compared with 1992-1997 [1], the Leningrad Nuclear Power Plant (NPP) equipment hermetic sealing (in 1998-1999) caused both the reduction of detection frequency of 131I aerosol and the maximum concentrations of 137Cs in the ground-level air at the NPP site. Long-term weekly nuclides' concentration time series were examined by the correlation analysis. Results of the analysis are presented. The seasonal fluctuations of 7Be concentrations in the ground-level air were examined by the harmonic (Fourier) analysis. The seasonal fluctuations of its concentrations with the maximum in spring-summer period are shown.
Źródło:
Nukleonika; 2001, 46, 4; 179-182
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Precise measurements of the changes of the ground water level in Lamkowko satellite observatory. Preliminary results
Autorzy:
Krankowski, A.
Kaczorowski, M.
Baran, L.
Sieradzki, R.
Krypiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/224782.pdf
Data publikacji:
2006
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
geodezja
geodezja satelitarna
obserwatorium
geodesy
satellite geodesy
observatory
Opis:
In the years 2003-2005 in the Lamkowko Satellite Observatory a measuring well equipped with a measuring float was establisshed. This measurement instrument was constructed jointly with Space Research Center of Polish Academy of Sciences. The measuring system enables to detect precisely changes in the level of ground water. The changes in the water level are measured with the accuracy better than 0.1 mm. the obtained accuracy of measuring allows to detect several phenomena: meteorological ones, geodynamics one4s, Earth tides. In this paper, the preliminary results of the first time series of changes of changes in the level of ground water are presented. The time series of these measurements, utilized in this study, cover only 4 months (from January to April 2006). Preliminary results enable to detect diurnal and semidiurnal oscillations.
Źródło:
Reports on Geodesy; 2006, z. 2/77; 47-52
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metodyka prowadzenia analizy wizualnej zobrazowań cyfrowych w celu wyznaczania dopuszczalnej wysokości lotu dla misji Open Skies
The methodology of conducting visual analysis of digital imagery when determining the minimal height above ground level for Open Skies missions
Autorzy:
Orych, A.
Powiązania:
https://bibliotekanauki.pl/articles/209897.pdf
Data publikacji:
2011
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
Open Skies
terenowa zdolność rozdzielcza
algorytmy próbkowania
sensory cyfrowe
ground resolution
resampling algorithms
digital sensors
Opis:
Traktat Open Skies jest międzynarodowym porozumieniem umożliwiającym jego sygnatariuszom wykonywanie nieuzbrojonych lotów obserwacyjnych nad terytorium innych państw - stron. Traktat dokładnie określa, jakie samoloty, sensory oraz filmy mogą być wykorzystywane podczas lotów obserwacyjnych. Każda konfiguracja kamery musi przejść proces certyfikacji zanim będzie mogła być wykorzystana podczas misji. Ma to na celu zapewnienie, że za pomocą konfiguracji kamery nie będzie możliwe uzyskanie zobrazowań o rozdzielczości lepszej niż ta określona przez traktat. Ponieważ terenowa zdolność rozdzielcza zależna jest od wysokości lotu, podczas certyfikacji należy określić minimalną dopuszczalną wysokość lotu, przy której nie zostanie przekroczona minimalna dopuszczalna terenowa zdolność rozdzielcza (Hmin) dla każdej konfiguracji kamery. Proces ten wykonywany jest poprzez analizę zobrazowań specjalnie skonstruowanych celów kalibracyjnych. Dotychczas traktat zezwalał jedynie na wykorzystywanie sensorów analogowych podczas misji obserwacyjnych. Wraz z pojawieniem się na rynku nowoczesnych rozwiązań cyfrowych rozpoczęto prace nad umożliwieniem wykorzystania tych nowych sensorów podczas misji Open Skies. Zobrazowania cyfrowe nie mogą być jednak rozpatrywane w ten sam sposób co tradycyjne zobrazowania analogowe. Sensory cyfrowe mogą spowodować występowanie pewnych artefaktów na zobrazowaniach. Te artefakty mogą spowodować niezgodne i niejednoznaczne odczyty i analizy, a co za tym idzie, niepoprawne wyznaczenie wartości Hmin. Dodatkowo, wpływ na wyznaczanie tej wartości może mieć sposób, w jaki obraz jest przetwarzany i wyświetlany. Zespół badawczy Wojskowej Akademii Technicznej wykonał serię testów w celu zbadania wpływu tych czynników.
The Treaty on Open Skies is an international agreement, which enables its signatories to perform unarmed observation flights over the territory of other State-Parties. The Treaty states very clearly what aircraft, sensors and films can be used during an observation flight. All camera configurations must pass a certification process before they are allowed to be used during observation missions. This is to ensure, that the camera configuration will not enable the Observing Party to obtain imagery which is of better resolution than that stated by the Treaty. According to the Treaty, frame and video sensors registering imagery in the visible and close infrared regions of the electromagnetic spectrum, can acquire imagery with a ground resolution no better than 30 cm. Because ground resolution is dependend on the height of the flight, a minimal allowed flying height (Hmin) at which the minimal resolution will not be exceeded must be determined for each configuration during certification. This is done by analyzing a series of images of specially constructed calibration targets. Up till now, the Treaty has only allowed for analogue sensors to be used during such observation flights. The 21st century has seen an extremely dynamic development in modern technologies. Traditional techniques which have been used to acquire imagery are now being pushed out by more modern solutions. The appearance of the DMC-2001 sensor in 2001 has opened new doors in the image acquisition and interpretation world. Such new sensors are now being considered by State-Parties, signatories of the Open Skies Treaty. However, imagery obtained from digital sensors cannot be regarded in the same way as traditional analogue imagery. Digital sensors can cause certain artifacts to appear on imagery. These artifacts can lead to inconsistent and ambiguous readings and analyses, in turn leading to incorrect determining of the Hmin value. Additionally, it has to be tested, whether the way in which an image is processed and displayed, can have any effect on the determination of this very important value. A research team at the Military University of Technology in Warsaw has performed a number of tests in order to analyze the affect of some of these factors.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2011, 60, 3; 321-334
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 61

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