Skocz do pozycji: 1.

Tytuł:

ON GENERATING MULTIVARIATE SAMPLES WITH ARCHIMEDEAN COPULAS

Autorzy:

Stelmach, Jacek

Powiązania:

https://bibliotekanauki.pl/articles/655822.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

Archimedean copulas
multivariate samples
permutation tests

Opis:

Archimedean copulas are one of the most known classes of copulas. They allow modeling the dependencies between variables with small number of parameters. This paper presents a method designated to generate multivariate samples of the same distribution like primary sample with Archimedean copulas. Such generator may be used in Monte Carlo investigations to create multivariate samples. Apart from theoretical considerations there are presented the examples of application of the method. All the calculations were carried out with R 2.15.0 packages.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 2014, 3, 302
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Application of selected ideas from statistical overlapping samples theory to tendency surveys: Designed panel vs resulting overlapping samples

Autorzy:

Kowalczyk, Barbara

Powiązania:

https://bibliotekanauki.pl/articles/500570.pdf

Data publikacji:

2015

Wydawca:

Szkoła Główna Handlowa w Warszawie

Tematy:

overlapping samples
repeated surveys
business tendency surveys
balance statistics

Opis:

Most tendency surveys are organized to be based on a fixed sample of units across time. This fixed panel constitutes a designed sample. But in practice the resulting sample always differs from the designed one, sometimes quite considerably. In tendency surveys, like in all real surveys, some sampled units refuse to participate, some agree to cooperate but forgo several periods later, some respond irregularly. Consequently, the resulting samples across time never constitute a perfect panel, they form an overlapping sample pattern. In the paper we propose a formula for adjusted balance statistics that takes into account distortion of a sample. The main idea of adjusted balance statistics is analogous to estimators known from statistical overlapping samples theory. Theoretical part of the paper is extended by empirical analysis of monthly business tendency survey data. In particular, the response pattern is studied and comparison of original and adjusted balance statistics is conducted.

Źródło:

Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2015, 96: Analyzing and forecasting economic fluctuations; 127-163
0866-9503

Pojawia się w:

Prace i Materiały Instytutu Rozwoju Gospodarczego SGH

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

QUANTITATIVE METHODS IN ACCOUNTING RESEARCH

Autorzy:

Gruszczyński, Marek

Powiązania:

https://bibliotekanauki.pl/articles/453702.pdf

Data publikacji:

2009

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki

Tematy:

accounting research
corporate disclosure
binary response
choice-based samples
matched samples
sample selection.

Opis:

Quantitative methods are in frequent use in modern accounting research. The evidence may be found e.g. in the journals like “Journal of Accounting Research”, “European Accounting Review”, “Review of Quantitative Finance and Accounting” or in the Accounting Research Network in SSRN base. Paper presents a brief survey of research areas and statistical-econometric approaches in accounting research. Particular reference goes to research on corporate disclosure. Methodological component of the paper includes remarks on the use of binary response models with choice-based and matched samples as well as comments on the sample selection approaches.

Źródło:

Metody Ilościowe w Badaniach Ekonomicznych; 2009, 10, 1; 76-87
2082-792X

Pojawia się w:

Metody Ilościowe w Badaniach Ekonomicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Some Remarks on Statistical Inference for Complex Samples
Uwagi o wnioskaowaniu statystycznym dla prób nieprostych

Autorzy:

Domański, Czesław

Powiązania:

https://bibliotekanauki.pl/articles/904714.pdf

Data publikacji:

2005

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

complex samples
estimation
goodness of fit tests

Opis:

Klasyczna teoria wnioskowania statystycznego dostarcza nam metod estymacji nieznanych parametrów rozkładu, szacowanie postaci funkcji określającej ten rozkład oraz weryfikację hipotez na podstawie prób prostych, tzn. takich, w których obserwacje są niezależne i mają ten sam rozkład prawdopodobieństwa. Na ogół jednak ze względu na koszty i efektywność badań posługujemy się próbami nieprostymi lub złożonymi (complex samples). Wyniki obserwacji w tych próbach są realizacjami stochastycznie zależnych zmiennych losowych o różnych rozkładach. W badaniach reprezentacyjnych wyróżniamy między innymi następujące schematy: losowanie zależne (bez zwracania), losowanie z różnymi prawdopodobieństwami wyboru, warstwowe, zespołowe i wielostopniowe. Przykładowo, losowanie bez zwracania eliminuje stochastyczną niezależność obserwacji, proces warstwowania zróżnicowanie prawdopodobieństw wyboru elementów próby, natomiast losowanie wielostopniowe wpływa na różnorodność rozkładów. Przedmiotem tej pracy są problemy związane z estymacją (metody adaptacji centralnego twierdzenia granicznego dla prób nieprostych) oraz weryfikacja hipotez o zgodności rozkładów dla prób nieprostych.
Classic theory of statistical inference gives us methods and verification of hypothesis for simple samples (observations are stochastically independent and have the same distribution). Because of costs and effectiveness of research we use simple samples. Observations in these samples are stochastically dependent and have different distribution. The paper presents problems in estimation and verifications of hypothesis of consistency of distributions for complex samples.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 2005, 194
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Thermophysical parameters of chosen granular samples

Autorzy:

Bozikova, M.

Powiązania:

https://bibliotekanauki.pl/articles/24725.pdf

Data publikacji:

2005

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Źródło:

International Agrophysics; 2005, 19, 3; 203-207
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Measurement the natural radioactivity of Sheep meat samples from Karbala governorate

Autorzy:

Kadhum, Nada Farhan
Omron, Auras Muse

Powiązania:

https://bibliotekanauki.pl/articles/1078152.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

HPGe detector
Natural radioactivity
Soil samples
Wassit governorate

Opis:

In this paper, the measurement of natural radioactivity in Sheep meat samples from different regions of Karbala governorate by using (Na(Tl)) detector. The results of measurements have shown that the specific activity and the determination of some other related parameters such as (Raeq , Hin, Iɣ, Iα, DƔ, Eff dos and AGDE). In fourteen four sheep meat samples by using NaI(Tl) detector. The results have shown that, the mean specific activity of (40K, 238U and 232Th) which were (6.813±1.82 Bq/kg, 3.865±1.033 Bq/kg and 1.02±1.03), respectively, were found to be less than the recommended values of specific activity given by (UNSCEAR, 2000).

Źródło:

World News of Natural Sciences; 2019, 22; 110-118
2543-5426

Pojawia się w:

World News of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Comparison of Microstructure and Mechanical Properties of Cast Steel Carried out on Cast-on Samples and Samples Cast Separately

Autorzy:

Kalandyk, B. E.
Zapała, R. E.

Powiązania:

https://bibliotekanauki.pl/articles/1837717.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

cast steel
cast-on samples
heat treatment
mechanical properties
metallography
staliwo
próbki odlewu
obróbka cieplna
właściwości mechaniczne
metalografia

Opis:

The results of microstructure examinations and UTS, YS, El, RA carried out on low-carbon cast steel containing 0.15% C. The tests were carried out on specimens cut out from samples cast on a large-size casting and from samples cast in separate foundry moulds. It has been shown that significant differences in grain size observed in the material of the separately cast samples and cast-on samples occur only in the as-cast. In the as-cast state, in materials from different tests, both pearlite percent content in the structure and mean true interlamellar spacing remain unchanged. On the other hand, these parameters undergo significant changes in the materials after heat treatment. The mechanical properties (after normalization) of the cast-on sample of the tested cast steel were slightly inferior to the values obtained for the sample cast in a separate foundry mould. The microscopic examinations of the fracture micro-relief carried out by SEM showed the presence of numerous, small non-metallic inclusions, composed mainly of oxide-sulphides containing Mn, S, Al, Ca and O, occurring individually and in clusters.

Źródło:

Archives of Foundry Engineering; 2021, 21, 2; 81-88
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Determination of di-n-butyl Phthalate in Environmental Samples

Autorzy:

Ziembowicz, Sabina
Kida, Małgorzata

Powiązania:

https://bibliotekanauki.pl/articles/27315758.pdf

Data publikacji:

2023

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

di-n-butyl phthalate
aqueous samples
landfill leachate
solid phase extraction
method validation

Opis:

A devised methodology presented here allows the determination of di-n-butyl phthalate in environmental samples (water and landfill leachate) using solid-phase extraction (SPE) and gas chromatography. It is developed based on the use of a gas chromatograph with an FID detector. Preliminary testing has also provided extraction parameters and conditions for chromatographic determination, with calibration applied by reference to an internal standard. The linearity of the calibration curve has been tested in DBP concentrations ranging from 0 to 7.5 mg/L, with the data obtained showing that, throughout this range, the detector readings as a function of the DBP concentrations remain linear (R2 coefficient >0.99). The average levels of recovery of DBP from aqueous solutions of phthalates are in the range of 97-109%, while the corresponding figures for leachates are 85-101%. The values of the coefficients of variation associated with the results obtained do not exceed 5%. The results, therefore, indicate that the applied extraction method is effective as regards DBP extraction from both water and landfill leachate, while numerous other substances present in the leachate from landfill sites apparently do not affect the correct determination of di-n-butyl phthalate by the method developed.

Źródło:

Rocznik Ochrona Środowiska; 2023, 25; 242--249
1506-218X

Pojawia się w:

Rocznik Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Further Discussion on Modeling of Measuring Process via Sampling of Signals

Autorzy:

Borys, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/226039.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

measuring process
sampling of signals
smearing of signal samples
averaging of signal samples

Opis:

In this paper, we continue a topic of modeling measuring processes by perceiving them as a kind of signal sampling. And, in this respect, note that an ideal model was developed in a previous work. Whereas here, we present its nonideal version. This extended model takes into account an effect, which is called averaging of a measured signal. And, we show here that it is similar to smearing of signal samples arising in nonideal signal sampling. Furthermore, we demonstrate in this paper that signal averaging and signal smearing mean principally the same, under the conditions given. So, they can be modeled in the same way. A thorough analysis of errors related to the signal averaging in a measuring process is given and illustrated with equivalent schemes of the relationships derived. Furthermore, the results obtained are compared with the corresponding ones that were achieved analyzing amplitude quantization effects of sampled signals used in digital techniques. Also, we show here that modeling of errors related to signal averaging through the so-called quantization noise, assumed to be a uniform distributed random signal, is rather a bad choice. In this paper, an upper bound for the above error is derived. Moreover, conditions for occurrence of hidden aliasing effects in a measured signal are given.

Źródło:

International Journal of Electronics and Telecommunications; 2020, 66, 3; 507-513
2300-1933

Pojawia się w:

International Journal of Electronics and Telecommunications

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

ESTIMATION OF POPULATION PARAMETERS USING INFORMATION FROM PREVIOUS PERIOD IN THE CASE OF OVERLAPPING SAMPLES – SIMULATION STUDY

Autorzy:

Kowalczyk, Barbara

Powiązania:

https://bibliotekanauki.pl/articles/453323.pdf

Data publikacji:

2013

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki

Tematy:

survey methodology
rotating surveys
repeated surveys overlapping samples

Opis:

The paper concerns the problem of estimating population parameters for repeated rotating surveys. Coefficients required for theoretical BLUE estimator for rotating surveys are for actual real surveys usually not known. There are no theoretical papers relating to this problem. It is therefore necessary to conduct suitable simulation studies. Broad simulation analyses conducted in the paper are carried out on the basis of two populations: generated from a multivariate normal distribution and based on real data derived from agricultural censuses.

Źródło:

Metody Ilościowe w Badaniach Ekonomicznych; 2013, 14, 1; 283-292
2082-792X

Pojawia się w:

Metody Ilościowe w Badaniach Ekonomicznych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Population Genetics Models for the Statistics of dna Samples Under Different Demographic Scenarios---Maximum Likelihood Versus Approximate Methods

Autorzy:

Polański, A.
Kimmel, M.

Powiązania:

https://bibliotekanauki.pl/articles/908157.pdf

Data publikacji:

2003

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

demografia
statystyka
DNA samples
demography
coalescence

Opis:

The paper reviews the basic mathematical methodology of modeling neutral genetic evolution, including the statistics of the Fisher-Wright process, models of mutation and the coalescence method under various demographic scenarios. The basic approach is the use of maximum likelihood techniques. However, due to computational problems, intuitive or approximate methods are also of great importance.

Źródło:

International Journal of Applied Mathematics and Computer Science; 2003, 13, 3; 347-355
1641-876X
2083-8492

Pojawia się w:

International Journal of Applied Mathematics and Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Gamma-Ray Spectrometry Laboratory for high-precision measurements of radionuclide concentrations in environmental samples

Autorzy:

Jodłowski, P.
Kalita, S. J.

Powiązania:

https://bibliotekanauki.pl/articles/148485.pdf

Data publikacji:

2010

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

gamma-ray spectrometry
environmental samples
efficiency
self-absorption
coincidence summing

Opis:

The paper outlines the methodology used in the Gamma-Ray Spectrometry Laboratory for high-precision measurements of radionuclide activity concentrations in environmental samples. The Laboratory equipment includes a semiconductor detector HPGe with a 42% relative efficiency. The detector is placed in a Pb housing made of bricks 10 cm in thickness. Three measurement geometries are considered: Marinelli beakers 710 cm3 in volume and two cylindrical geometries 121 and 48 cm3 in volume. In the efficiency calibration (E = 32 division sign 1836 keV) mixed gamma standard solutions were used. Obtained experimental efficiency values epsilon were fitted with two quadratic functions. The junction point is that equivalent to 200 keV. Uncertainty of the calibration curve is 2% for E > 200 keV. The relationship between the total efficiency and the energy epsilon t(E) was also found for energies E = 33 division sign 1250 keV. Self-absorption correction factors Cs are calculated by the method proposed by K. Debertin, the uncertainty level being 1 division sign 2% for E > 100 keV. These correction factors are calculated by an original computer program. Coincidence summing correction factors Cc for the selected nuclides are derived using the ETNA computer program, basing on the relationships epsilon(E) and epsilon t(E). Minimum detectable activity (MDA) for selected nuclides encountered in environmental samples was determined for the water matrix. The methodology used was successfully verified in the course of international intercomparison measurements.

Źródło:

Nukleonika; 2010, 55, 2; 143-148
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Simple, responsive and cost effective simultaneous quantification of Ga(III) and In(III) in environmental water samples

Autorzy:

Grabarczyk, M.
Adamczyk, M.

Powiązania:

https://bibliotekanauki.pl/articles/2082480.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

gallium(III)
indium(III)
trace analysis
environmental
water samples

Opis:

The simultaneous determination of Ga(III) and In(III) in environmental water samples was described. The procedure was based on adsorptive stripping voltammetry using an in situ plated bismuth film electrode as a working electrode. In order to obtain low detection limits and satisfactory separations of gallium and indium peaks on the voltammogram, cupferron was used as a complexing agent. The optimum composition of the supporting electrolyte was found to be: 0.1 mol l-1 acetate buffer (pH=5.0), 2 × 10-4 mol l-1 cupferron, 2 × 10-4 mol l-1 Bi(III), optimal voltammetric parameters were found to be: accumulation potential -0.9 V, accumulation time 60 s. The linear range of Ga(III) as well as In(III) was observed over a concentration range from 2.5 × 10-8 mol l-1 to 1.5 × 10-6 mol l-1. The method was satisfactorily applied to the simultaneous quantification of gallium and indium in environmental water samples. This facilitated a promising application of the recommended procedure for monitoring the environment, which is necessary to evaluate the soil-plant system.

Źródło:

International Agrophysics; 2019, 33, 2; 161-166
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Measurement the natural radioactivity of Chicken meat samples from Karbala governorate

Autorzy:

Ridha, Ali Abdulwahab
Ibrahim, Nadhim Khaleel
Omron, Auras Muse
Kadhum, Nada Farhan

Powiązania:

https://bibliotekanauki.pl/articles/1076107.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Chicken meat samples
Karbala governorate
Na(Tl) detector

Opis:

In this paper, the measurement of natural radioactivity in Chicken meat samples from different regions of Karbala governorate by using (Na(Tl)) detector. The results of measurements have shown that the specific activity and the determination of some other related parameters such as (Raeq, Hin, Iɣ, Iα DƔ, Eff dos and AGDE). In Fourteen four chicken meat samples by using NaI(Tl) detector. The results have shown that, the mean specific activity of (40K, 238U and 232Th) which were (14.272±14.2 Bq/kg, 2.255±0.45 Bq/kg and 1.3±0.26), respectively, were found to be less than the recommended values of specific activity given by (UNSCEAR, 2000).

Źródło:

World Scientific News; 2019, 117; 196-203
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Verification of Hypotheses Concerning Parameters of the Regression Model for Complex Samples
Weryfikacja hipotez dotyczących parametrów modelu regresji dla prób nieprostych

Autorzy:

Domański, Czesław

Powiązania:

https://bibliotekanauki.pl/articles/906878.pdf

Data publikacji:

2007

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

complex samples
test F
testing
design effect
χ² test

Opis:

The paper considers the linear regression function y = βx + ε, where β is a vector of unknown parameters and ε is a rest component. In case of complex samples some modifications of test statistics should be made. Results of simulation study revealed that the verification of the hypothesis H₀:β = β₀ should be conducted by means of modified test F.
Problem szacowania parametrów funkcji regresji na podstawie prób nieprostych jest badany z górą od dwudziestu pięciu lat. Przedmiotem badania będzie liniowa funkcja regresji postaci macierzowej: y = βx + ε, gdzie β jest wektorem nieznanych parametrów, natomiast ε jest składnikiem resztowym. W przypadku prób nieprostych należy dokonać modyfikacji statystyki testowej, uwzględniając tzw. efekt schematu losowania. W pracy prezentowane są wyniki badań symulacyjnych, które wskazują na konieczność weryfikacji hipotezy H₀:β = β₀ za pomocą zmodyfikowanego testu F.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 2007, 206
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Efficacy of the detection of Legionella in hot and cold water samples by culture and PCR. II. Examination of native samples from various sources

Autorzy:

Stojek, N.M.
Wojcik-Fatla, A.
Dutkiewicz, J.

Powiązania:

https://bibliotekanauki.pl/articles/50046.pdf

Data publikacji:

2012

Wydawca:

Instytut Medycyny Wsi

Opis:

A total of 123 water samples were examined in parallel by culture and semi-nested PCR for the presence of Legionella. They comprised: 35 samples of hot water distributed by the urban municipal water supply system (MWSS) taken in institutions, 45 samples of hot water distributed by urban MWSS taken in dwellings, 27 samples of cold water distributed by rural MWSS taken in dwellings, and 16 samples of cold well water taken in rural areas. The greatest frequency of the isolation of Legionella by culture (88.6%) was recorded in the samples of hot water from the urban institutions, having been greater compared to all other sources (p<0.001). The frequency of Legionella isolation from hot water in urban dwellings (28.9%) was significantly greater compared to the combined value (2.3%) for cold water from rural MWSS and wells (p<0.001). Strains belonging to Legionella pneumophila serogroups 2-14 predominated in the examined samples, while strains of L. pneumophila serogroup 1 and strains of Legionella spp. (other than L. pneumophila) were 3-fold less numerous. The rates of positive findings in the semi-nested PCR (stage 2) were greater than culture isolations in all kinds of samples, except for urban institutions. The correlation between the culture and PCR results was positive for samples of hot water from urban MWSS (p<0.01), but not for samples of cold water from rural MWSS and wells (p>0.5). A significant correlation was found between rates of PCRpositive results and numbers of Legionella pneumophila serogroups 2-14 strains, but not for other Legionella serogroups or species. In conclusion, our results support the opinion that though PCR cannot be a substitute for the isolation of Legionella by culture, it could be regarded as an useful complementary method.

Źródło:

Annals of Agricultural and Environmental Medicine; 2012, 19, 2
1232-1966

Pojawia się w:

Annals of Agricultural and Environmental Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

New Dynamic Method for Examination of Elastic Properties of Thin Wire Samples

Autorzy:

KVETAN, Karol
KUBLIHA, Marian
OŽVOLDOVÁ, Miroslava
BOŠÁK, Ondrej
NAĎ, Milan
KOTIANOVÁ, Janette

Powiązania:

https://bibliotekanauki.pl/articles/455675.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Rzeszowski

Tematy:

elastic modulus
connected reverse pendulums
thin wire samples

Opis:

Classical reverse pendulums are currently used for measuring the gravity acceleration g, or – when pendulums bodies are connected by the spring – for demonstration of composition of parallel vibrations. In this paper we present the reversed pendulums in „non-traditional” position – as a device for measuring of elastic modulus of wire samples. The connection is realized by the measured wire sample with the circle shape.

Źródło:

Edukacja-Technika-Informatyka; 2015, 6, 2; 179-185
2080-9069

Pojawia się w:

Edukacja-Technika-Informatyka

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 18.

Tytuł:

Alpha particles concentrations from soil samples of Al-Najaf/ Iraq

Autorzy:

Abojassim, A.A.

Powiązania:

https://bibliotekanauki.pl/articles/905365.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Opis:

Soil samples were collected at Al-Najaf governorate, Iraq and assessed for radon concentrations using CN-85 detector and uranium concentrations using CN-85 and CR-39 detectors. Also, Some radiation parameters due to radon concentrations were calculated. Radon concentrations were varied from (506.84) Bq/m³ to (1194.69) Bq/m³ with an average of (894.21±77.80) Bq/m³, while the radium content were varied from (77.19) Bq/kg to (181.95) Bq/kg with an average (136.18±11.84) Bq/kg. The average values of the rate of radon exhalation in term of mass, in term of area and the soil radon concentration contributing to indoor radon activity were (1.01±0.08) Bq/kg.h, (4.56±0.39) Bq/m².h and (18.24±1.58) Bq/m³ respectively. Also it is found that the average value of effective dose equivalent, annual effective dose and absorbed dose in soft tissues and in lungs were (0.084±0.007) WLM/y, (0.574±0.050)mSv/y, (0.090±0.007) nGy/h and (0.729±0.063) nGy/h respectively. Among other things, uranium concentration using CN-85 and CR-39 detectors were varied from (0.85) ppm to (2.0) with an average (1.5±0.13) ppm and from (1.16) ppm to (2.17) with an average (1.5±0.13) ppm respectively. The correlation between the contributing of radon to indoor with radium content and uranium concentrations with two detectors (CN-85 and CR-39) in clear. Finally, the values of radon concentrations, radium content, radon exhalation rate in term of area, annual effective dose and uranium concentrations in soil samples in the present study were below limits the world average, so can be consider according results the area under study does not pose risk to human health.

Źródło:

Polish Journal of Soil Science; 2017, 50, 2
0079-2985

Pojawia się w:

Polish Journal of Soil Science

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 19.

Tytuł:

Rapid and simple screening of transgenic mice: novel extraction-free, filter-based PCR genotyping from blood samples

Autorzy:

Suematsu, Naoya
Isohashi, Fumihide

Powiązania:

https://bibliotekanauki.pl/articles/1041227.pdf

Data publikacji:

2006

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

cytosolic acetyl-CoA hydrolase
blood samples
PCR genotyping
transgenic mice
FTA filter paper

Opis:

We evaluated the effectiveness of using Flinders Technology Associates (FTA) filter paper for the polymerase chain reaction (PCR) genotyping of transgenic mice. Tail prick blood sample dried on an FTA filter disc was processed for genomic PCR. It is easy and rapid to prepare DNA templates because the protocol is extraction-free and only requires minimal handling of wash briefly bloodstained FTA filter discs. Progeny of a transgene-positive founder mated with wild-type mice was screened for the presence of the transgene by the filter-based PCR using transgene-specific primers. The resulting amplicons with expected sizes of 3134 bp, 1152 bp, 877 bp and 688 bp were robust and reproducible, allowing a distinction between transgenic (n=44) and wild-type (n=47) mice showing no signal. The filter-based PCR screening took only half a day. The present study confirmed the validity and usefulness of the novel rapid extraction-free genotyping method.

Źródło:

Acta Biochimica Polonica; 2006, 53, 3; 613-613
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 20.

Tytuł:

Positron Annihilation in Helium Charged Ni Samples

Autorzy:

Pająk, J.
Rozenfeld, B.

Powiązania:

https://bibliotekanauki.pl/articles/1929108.pdf

Data publikacji:

1993-03

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.70.Bj

Opis:

The angular correlation curves of annihilation quanta and isochronal annealing curves for the plastically deformed nickel samples charged with helium have been measured. The results indicate that helium is effectively trapped at crystal lattice defects and is released from them at the temperature below 350 K.

Źródło:

Acta Physica Polonica A; 1993, 83, 3; 371-374
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 21.

Tytuł:

Metoda opracowania wyników obserwacji bazująca na ich porównaniu z próbami referencyjnymi
Method of the observations processing based on their comparison with the reference samples

Autorzy:

Dorozhovets, M.

Powiązania:

https://bibliotekanauki.pl/articles/154913.pdf

Data publikacji:

2009

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

opracowanie danych
obserwacje
próby referencyjne
data processing
observations
reference samples

Opis:

W artykule została zaproponowana i zbadana metoda opracowania wyników obserwacji, bazująca na ich porównywaniu z próbami referencyjnymi o zadanych właściwościach. Przedstawiono modele matematyczne najlepszego wyniku pomiaru oraz jego standardowej niepewności. Metodą Monte Carlo przeprowadzono badania symulacyjne skuteczności metody dla kilku wybranych rozkładów prawdopodobieństwa populacji przy liczbie obserwacji od 9 do 49. Stwierdzono, że jeśli liczba obserwacji wynosi kilkanaście i więcej, to proponowana metoda zapewnia zmniejszenie niepewności wyniku w porównaniu z niepewnością wartości średniej.
New method of the measurement result and its uncertainty determination, based on the comparison of input sample after its sorting with several reference samples (Fig. 1, Fig. 2), which correspond to models of the general population density distributions, is investigated and analyzed in the paper. Elements of the reference sample are the observations, which ideally reflect the properties of the general population distribution, and their values are calculated as the mathematical expectations of ordinal statistics corresponding to this distribution (1). Mathematical models of the determination of the best result (2), (9) and its standard uncertainty (12), (13) are presented. The effectiveness of propose method is investigated by the Monte Carlo method for 5 models of general population (Laplace, normal, triangular, uniform and arcsine (Fig. 3)) with the number of observations 9, 19, 29, 39 and 49. If the observation distribution significantly differs from normal distribution then the proposed method guarantees considerable decreasing of the uncertainty result in comparison with the uncertainty of average value (Fig. 4). As a result of investigations it is established that if the number of observations exceeds about 12-15, then in approximately ? cases the proposed algorithm identifies distribution correctly and in the rest near ? cases the nearest (accordingly the value of contra kurtosis (5)) distributions (Fig. 5). The proposed method can be used when the number of registered observations is small, when due to this the histogram is unstable and also the statistical tests can be positive for some models of the density distributions of the general populations simultaneously.

Źródło:

Pomiary Automatyka Kontrola; 2009, R. 55, nr 9, 9; 754-757
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 22.

Tytuł:

Zanieczyszczenie wybranych próbek stałych węglowodorami aromatycznymi przy trasach wylotowych z miasta Olecko
PAHs contamination in chosen samples taken from the Olecko region

Autorzy:

Chrząścik, Ireneusz
Szymalska, Magdalena
Kluska, Mariusz

Powiązania:

https://bibliotekanauki.pl/articles/1817556.pdf

Data publikacji:

2007-12-31

Wydawca:

Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie

Tematy:

próbki środowiskowe
sorpcja
węglowodory aromatyczne
environmental samples
sorption
PAHs
HPLC

Opis:

This paper presents the results of research conducted on some samples with soil and cabbage taken from the vicinity of Olecko town (Suwałki, Gołdapia, Ełk, Giżycko) and containing polycyclic aromatic hydrocarbons (PAHs) with 16 aromatic rings, the research is a continuation of a detailed monitoring of progressing pollution in the Olecko region, the samples were taken in August 2006 from the place situated 10 m from a road, this place was at the same time a cabbage plantation, the highest concentration of PAHs (750 pg/kg s. m.) was found in the sample taken close to the road from Olecko to Suwałki and in the sample with cabbage (313 pg/kg s. m.) taken near the road to Gołdapia. The lowest concentration of PAHs was stated in the samples taken in the vicinity of the road to Giżycko, the results don’t overpass the limits permitted in Poland but, unfortunately, are close to the upper limit of natural concentration defined by scientific literature.

Źródło:

Studia Ecologiae et Bioethicae; 2007, 5, 1; 295-304
1733-1218

Pojawia się w:

Studia Ecologiae et Bioethicae

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 23.

Tytuł:

Oznaczanie wybranych filtrów UV w próbkach wody
Determination of selected UV filters in water samples

Autorzy:

Gackowska, A.
Gaca, J.
Załoga, J.

Powiązania:

https://bibliotekanauki.pl/articles/1217169.pdf

Data publikacji:

2012

Wydawca:

Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem

Tematy:

filtry EHMC
MBBM
oznaczanie
walidacja
próbki wody i ścieków
filters EHMC
labeling
validation
samples of water and wastewater

Opis:

W artykule przedstawiono metody oznaczania wybranych filtrów UV w próbkach wody i ścieków. Opisano procedurę wzbogacania i izolacji dwóch filtrów UV z próbek wody i ścieków. Do analizy wykorzystano chromatograf gazowy sprzężony z detektorami płomieniowo-jonizacyjnym i spektrometrii mas (GC-FID-MS) oraz chromatograf cieczowy wyposażony w detektor z matrycą diod (HPLC-UV-DAD). Dla obu metod wykonano walidację. Etyloheksylo- metoksycynamonian (EHMC) i 1-(4'-t-butylofenylo)-3-(4''-metoksyfenylo-)propano-1,3-dion (MBBM) oznaczono w próbkach wody i ścieków kąpielowych. Oznaczono granicę wykrywalności i oznaczalności oraz wartość odzysku badanych związków. Uzyskano zadowalającą precyzję (RSD 5 -15 %). Przeprowadzono wstępne badania trwałości EHMC pod wpływem działania promieniowania UV. Wykazano, że produktem degradacji EHMC jest pochodna kwasu cynamonowego.
Methods for the determination of selected UV filters in water and wastewater samples have been presented. Procedure for enrichment and isolation of two UV filters from water and wastewater samples was described. Gas chromatograph coupled with flame ionization detector and mass spectrometry (GC-FID-MS) as well as liquid chromatograph equipped with UV and Diode Array (HPLC-UVDAD) detectors were used for the analysis. For both the methods, validation was performed. 2-Ethylhexyl 3- (4-methoxyphenyl)-2- propenoate (EHMC) and 1-(4'-t-butylphenyl)-3-(4''-methoxyphenyl-) propane-1,3-dione (MBBM) were determined in samples of water and bathing wastewater. Limit of detection, limit of quantification and recovery of the tested compounds were determined. The precision was satisfactory (RSD 5-15 %). Preliminary studies on stability of EHMC under influence of UV radiation were carried out. It was found that cinnamic acid derivative was the product of EHMC degradation.

Źródło:

Chemik; 2012, 66, 6; 615-620
0009-2886

Pojawia się w:

Chemik

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 24.

Tytuł:

A novel method for amplitude and phase measurements based on multiple samples

Autorzy:

Xiong, X.
Zieliński, A.

Powiązania:

https://bibliotekanauki.pl/articles/332594.pdf

Data publikacji:

2007

Wydawca:

Polskie Towarzystwo Akustyczne

Opis:

Precise amplitude and phase measurement of a narrowband signal is required in many practical applications related to underwater sensing, navigation, and positioning. In this paper, we propose a novel method for digital signal acquisition based on multiple signal sampling. This method is an extension of quadrature sampling where amplitude and phase of a harmonic signal can be obtained based on only two samples taken within one period. The advantage of our generalization are reduced errors caused by quantization noise of A/D converters.

Źródło:

Hydroacoustics; 2007, 10; 207-214
1642-1817

Pojawia się w:

Hydroacoustics

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 25.

Tytuł:

Przepis kontroli i odbioru prób relaskopowych
Procedure of checking and reception of relascope samples

Autorzy:

Rutkowski, B.

Powiązania:

https://bibliotekanauki.pl/articles/813806.pdf

Data publikacji:

1978

Wydawca:

Polskie Towarzystwo Leśne

Źródło:

Sylwan; 1978, 122, 05
0039-7660

Pojawia się w:

Sylwan

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 26.

Tytuł:

Analysis of surfaces for characterization of fungal burden – Does it matter?

Autorzy:

Viegas, Carla
Faria, Tiago
Meneses, Márcia
Carolino, Elisabete
Viegas, Susana
Gomes, Anita Q.
Sabino, Raquel

Powiązania:

https://bibliotekanauki.pl/articles/2177424.pdf

Data publikacji:

2016-05-12

Wydawca:

Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi

Tematy:

surface samples
fungal burden assessment
high fungal load settings
low fungal load settings
air samples
occupational environments

Opis:

Objectives Mycological contamination of occupational environments can be a result of fungal spores’ dispersion in the air and on surfaces. Therefore, it is very important to assess it in both types of the samples. In the present study we assessed fungal contamination in the air and in the surface samples to show relevance of surfaces sampling in complementing the results obtained in the air samples. Material and Methods In total, 42 settings were assessed by the analysis of air and surfaces samples. The settings were divided into settings with a high fungal load (7 poultry farms and 7 pig farms, 3 cork industries, 3 waste management plants, 2 wastewater treatment plants and 1 horse stable) and a low fungal load (10 hospital canteens, 8 college canteens and 1 maternity hospital). In addition to culture-based methods, molecular tools were also applied to detect fungal burden in the settings with a higher fungal load. Results From the 218 sampling sites, 140 (64.2%) presented different species in the examined surfaces when compared with the species identified in the air. A positive association in the high fungal load settings was found between the presence of different species in the air and surfaces. Wastewater treatment plants constituted the setting with the highest number of different species between the air and surface. Conclusions We observed that surfaces sampling and application of molecular tools showed the same efficacy of species detection in high fungal load settings, corroborating the fact that surface sampling is crucial for a correct and complete analysis of occupational scenarios.

Źródło:

International Journal of Occupational Medicine and Environmental Health; 2016, 29, 4; 623-632
1232-1087
1896-494X

Pojawia się w:

International Journal of Occupational Medicine and Environmental Health

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 27.

Tytuł:

Molecular detection of crimean-congo hemorrhagic fever virus (CCHFV)in tick samples but not in blood and milk samples of domestic ruminant species (cattle, sheep and goat) in northern Turkey

Autorzy:

Özüpak, T.
Albayrak, H.

Powiązania:

https://bibliotekanauki.pl/articles/2087269.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Crimean Congo Hemorrhagic Fever Virus
domestic ruminant
milk
tick

Źródło:

Polish Journal of Veterinary Sciences; 2020, 23, 4; 651-653
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 28.

Tytuł:

Comparison of the detection efficiency of haemoparasite DNA in blood and faecal samples – the way to eco-epidemiological studies

Autorzy:

Bajer, A.
Dwużnik, D.
Tołkacz, K.
Alsarraf, M.
Mierzejewska, E.J.

Powiązania:

https://bibliotekanauki.pl/articles/2085115.pdf

Data publikacji:

2019

Wydawca:

Instytut Medycyny Wsi

Tematy:

Babesia canis
Babesia microti
Babesia vulpes
Hepatozoon canis
red fox
faecal samples
faeces

Opis:

Introduction and objective. It is easier and non-invasive to obtain faecal samples compared with blood samples. Molecular techniques may enable detection of parasites even in tiny amounts of blood-containing faeces. We aimed to compare the sensitivity of detection of three Babesia species and Hepatozoon canis in blood and faecal samples, including samples derived from naturally infected hosts. Materials and method. Three groups were involved: 1) Nine BALB/c mice infected with Babesia microti sampled during acute (n=3), post-acute (n=3) and chronic phases of infection (n=3); 2) Eight dogs with symptoms of babesiosis; 3) Six red foxes infected with B. vulpes, one fox infected with B. canis, four foxes infected with H. canis. Genomic DNA was extracted from blood and faeces by use of commercial kits and amplified with genus-specific primers in one-step or nested PCR reactions. Selected PCR products were sequenced. Results. No positive results for faecal samples were obtained from H. canis-positive foxes in contrast to Babesia spp. infections. Positive results from PCRs were obtained for all BALB/c mice (100%), five dogs (62.5%) and four of seven foxes (57.1%). Successful sequencing was obtained for six selected murine samples (B. microti), four canine samples (B. canis) and for one fox sample (B. vulpes). The success of B. microti detection in murine faecal samples from acute, post-acute and chronic phases was identical (100%). Conclusions. Detectability of Babesia spp. infections was lower in naturally infected dogs and foxes, compared to experimentally infected mice. Detection of DNA in faecal samples can be useful in the detection of Babesia infection in populations from which blood samples are hard to obtain, but due regard must be given to the possibility that prevalence of infection may be severely underestimated.

Źródło:

Annals of Agricultural and Environmental Medicine; 2019, 26, 4; 538-543
1232-1966

Pojawia się w:

Annals of Agricultural and Environmental Medicine

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 29.

Tytuł:

Badanie własności wybranej charakterystyki sygnału sinusoidalnego wyznaczanej na podstawie sześciu próbek sygnału
Study of selected sinusoidal signal characteristic obtained from six signal samples

Autorzy:

Sienkowski, S.
Krajewski, M.

Powiązania:

https://bibliotekanauki.pl/articles/158483.pdf

Data publikacji:

2014

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

sześć próbkek sygnału
funkcja autokorelacji
wartość średniokwadratowa
six signal samples
autocorrelation function
mean square estimator

Opis:

W artykule przedstawiono wyniki badania własności wybranej charakterystyki sygnału sinusoidalnego wyznaczanej na podstawie możliwie najmniejszej liczby próbek sygnału. Do badań zastosowano funkcję autokorelacji sygnału. Pokazano, że do wyznaczania wartości funkcji autokorelacji wystarczy sześć próbek sygnału oraz, że podczas obliczania wartości funkcji autokorelacji odpowiedni dobór parametrów sygnału powoduje wyeliminowanie skutków operacji kwantowania.
This paper presents the results of a research of the selected sinusoidal signal characteristic obtained from the smallest possible number of the signal samples. Research was carried out using the autocorrelation function. It was shown that the values of the autocorrelation function can be determined on the basis of six signal samples. It was also shown that the appropriate selection of the signal parameters eliminates the effects of quantization. Chapter 1 provides basic information on the reasons for study of the autocorrelation function properties. In Chapter 2 the results of the theoretical study were presented. Th. 1 deals with the determination of the sinusoidal signal autocorrelation function and her estimator, when M >> 1, where M is the number of samples. Eq. (1) describes the relation between the number of samples and the delay times of the autocorrelation function. Eq. (3) presents the autocorrelation function estimator. In the second Theorem, it has been shown that, to determine the autocorrelation function values can be used only six sinusoidal signal samples. In the next part of Chapter 2 the third Theorem has been presented. It has been shown that if the initial phase of the signal is equal to (...)/2, then the effects of quantization are eliminated. In Chapter 3 the results of the experimental research were presented. Eq. (22) and (23) describes the mean of the mean square estimator obtained on the basis the autocorrelation function. In Fig. 1 the eq. (22) and (23) have been shown.

Źródło:

Pomiary Automatyka Kontrola; 2014, R. 60, nr 11, 11; 948-950
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 30.

Tytuł:

Positron Annihilation in Defected Monocrystalline Gold Samples

Autorzy:

Pająk, J.
Rudzińska, W.
Szuszkiewicz, M.
Garłowska, M.

Powiązania:

https://bibliotekanauki.pl/articles/2043340.pdf

Data publikacji:

2005-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.70.Bj

Opis:

Angular distribution of the positron annihilation quanta was measured for monocrystalline gold samples, oriented in (110) and (111) directions. The samples were deformed by elongation for different deformation degrees. The S and W parameters as a function of deformation degree of the sample were determined. It was found that the dynamics of the dislocations and vacancy generation during the sliding of some crystallographic planes, depends on the crystallographic direction.

Źródło:

Acta Physica Polonica A; 2005, 107, 5; 848-851
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 31.

Tytuł:

Detection of Echinococcus multilocularis in faeces by nested PCR with the use of diluted DNA samples

Autorzy:

Karamon, J.

Powiązania:

https://bibliotekanauki.pl/articles/30812.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Opis:

The aim of this study was to choose the optimal variant of PCR examination of faeces to detect Echinococcus multilocularis infection which would allow to reduce the influence of different inhibitors in faeces. The investigation was carried out by comparison of 3 different methods of DNA isolation from faeces and different DNA dilutions used in PCR. Thirty five intestines of red foxes were used. Small intestines were examined by the sedimentation and counting technique (SCT). Faeces were collected from the rectum for PCR and flotation. DNA were isolated with the use of 3 different methods. Two methods were dedicated for faeces: method 1 (M1) - for larger samples and method 2 (M2) - for standard samples. The third method, method 3 (M3), was not dedicated for faeces. DNA samples were tested by nested PCR in 6 variants: not diluted (1/1) and 5 diluted (1/2.5, 1/5, 1/10. 1/20, 1/40). E. multilocularis was found by SCT in 18 from 35 (51.4%) intestines. Taenia-type eggs were detected only in 20.0% of faecal samples. In PCR the highest number of positive results (45.7%) were obtained during examination of DNA isolated by M1 method, and then 40.0% and 34.3%, respectively, for M2 and M3. In some samples positive results in PCR were obtained only in diluted DNA. For example, 8 from 12 positive samples isolated by M3 method gave the PCR negative results in non-diluted DNA and positive only after dilution 1:2.5, 1:10 or 1:20. Also 3 samples isolated by methods dedicated for stool gave positive results only after DNA dilution. The investigation has revealed that in copro-PCR for detection of E. multilocularis infection additional using of diluted DNA (besides non diluted) can avoid false negative results causing by PCR inhibition. In the best method of DNA isolation (M1), the use of non diluted DNA sample together with diluted in proportion 1:10 seems to be optimal.

Źródło:

Polish Journal of Veterinary Sciences; 2014, 17, 1
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 32.

Tytuł:

An experimental study of selected Jurassic carbonate samples from north-eastern Tunisia

Autorzy:

Dhahri, R.
Ezzine, I.
Ghanmi, M.

Powiązania:

https://bibliotekanauki.pl/articles/886200.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

/5

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Skocz do pozycji: 33.

Tytuł:

Characterisation of the ancient city of Teos western necropolis sherd samples

Autorzy:

Polat, R.
Tunalı, A.

Powiązania:

https://bibliotekanauki.pl/articles/1061991.pdf

Data publikacji:

2016-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

81.05.Je

Opis:

Ancient city of Teos, one of the Ionian Religion Cities, is located in Sığacık district, Seferihisar Province in Izmir. The city was inhabited from Protogeometric period. The ancient city which has sheltered two harbors, due to its geographical position as a major trading center in the early emerges. Phokaia has been north of the city, Miletus has been south of the city, Samos and Khios Island have been in Ionian Cities. In this study, rescue excavations carried out by Izmir archaeological Museum in west and northwest of the city between 2013 and 2014. One of the necropolis is in the city as crow flies 1.1 km northwest, the other necropolis is located 1 km west of the city. This study will be dealt with the characterisation of clay and sherd samples which are obtained by necropolis. Samples from west and northwest of the necropolis of Teos City have been characterised by X-ray diffraction analyses and chemical analysis X-ray fluorescence methods.

Źródło:

Acta Physica Polonica A; 2016, 129, 4; 521-523
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

LC determination and stability assessment of macrolide antibiotics azithromycin and spiramycin in bulk and tablet samples

Autorzy:

Mahmoudi, A.

Powiązania:

https://bibliotekanauki.pl/articles/11708.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Opis:

Development and validation of rapid HPLC method for quantifying macrolide antibiotics azithromycin (AZI) and spiramycin (SPI) in bulk and tablet samples is described. Determination was performed on a reversed phase C18 ODB column (250×4.6 nm I.D) at ambient temperature, and employing a UV-detection set at 210 nm. The mobile phase consists of acetonitrile –2-methyl-2- propanol–hydrogenphosphate buffer, pH 6.2, with 1.8% triethylamine (32:8: up to 100, v/v/v), delivered at a flow-rate of 1.1 mL min-1. The assay is linear in concentration ranges of: 0.004–4.8 and 0.0003–1.2 mg mL−1 for azithromycin and spiramycin, respectively, with detection limit of 0.02% for SPI and 0.03% for AZI. Recovery experiments revealed recovery of 98.51–100.82%. The applicability of this method in stability assessment studies is evaluated.

Źródło:

International Letters of Natural Sciences; 2015, 47
2300-9675

Pojawia się w:

International Letters of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Technologia przygotowania próbek do badań wytrzymałościowych materiałów stosowanych w konstrukcjach lotniczych
The technology for preparation of samples for the strength tests of materials used in aviation constructions

Autorzy:

Kozioł, S.
Zbrowski, A.

Powiązania:

https://bibliotekanauki.pl/articles/257433.pdf

Data publikacji:

2011

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy

Tematy:

badanie materiałowe
wytrzymałość materiałów
próbka
obróbka ścierna
material testing
material strength
samples
abrasive processing

Opis:

Artykuł prezentuje specjalną technologię wykonania próbek do badań wytrzymałościowych materiałów stosowanych w konstrukcjach lotniczych. Uwzględnia ona specyficzne wymagania dotyczące dokładności i geometrii warstwy wierzchniej próbek do badań wytrzymałości zmęczeniowej. Opisano specjalne urządzenie do ściernej obróbki wykańczającej odcinka po-miarowego oraz wyniki pomiarów uzyskanych dokładności.
The article presents the special technology for manufacturing of the samples for strength tests of materials used in aviation constructions. It considers the specific requirements for accuracy and geometry of the top layer of the samples for strength testing. It describes the special device for abrasive processing for finishing of the tested section and presents the results of measurement of the achieved accuracy.

Źródło:

Problemy Eksploatacji; 2011, 2; 251-263
1232-9312

Pojawia się w:

Problemy Eksploatacji

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Comparison beech wood tension strength parallel to grain of cylindrical samples with conical and funnel tapering versus standard rectangular cross section samples

Autorzy:

Karwat, Zbigniew
Koczan, Grzegorz
Rębkowski, Bartłomiej
Kozakiewicz, Paweł

Powiązania:

https://bibliotekanauki.pl/articles/2201354.pdf

Data publikacji:

2022

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna

Tematy:

tension strength
cylindrical sample
conical shape
funnel shape
rectangular shape
turn-milling
beech Wood

Opis:

In this paper, the influence of shape samples on tension strength parallel to grain of beech wood have been analyzed. The cylindrical samples with conical tapering and with funnel tapering were used. Both types of cylindrical samples were compared with one-sided tapered standard samples with a rectangular cross-section. Experimental outcome indicates that cylindrical samples have higher tension strength than rectangular standard ones. Whereas shape of tapering in cylindrical samples (conical or funnel) was not statistically significant. Furthermore the presentation and reanalysis of data concerning use of cylindrical samples made of seven domestic wood species from the doctoral dissertation were performed. Comparison of that data with source data about tension strength of standard rectangular samples, have proven higher tension strength parallel to grain of cylindrical samples.

Źródło:

Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2022, 65, 209; Art. no. 1644-3985.403.11
1644-3985

Pojawia się w:

Drewno. Prace Naukowe. Doniesienia. Komunikaty

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Quantification of Chaetomium globosum spores in house dust samples

Autorzy:

Shi, C.
Provost, N.B.
Desroches, T.
Miller, J.D.

Powiązania:

https://bibliotekanauki.pl/articles/51412.pdf

Data publikacji:

2014

Wydawca:

Instytut Medycyny Wsi

Źródło:

Annals of Agricultural and Environmental Medicine; 2014, 21, 3
1232-1966

Pojawia się w:

Annals of Agricultural and Environmental Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Influence of the distance between a reflectance sensor and soil samples with different roughness on their spectra

Autorzy:

Herodowicz, K.

Powiązania:

https://bibliotekanauki.pl/articles/905459.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Opis:

The study assessed the influence of the distance between a reflectance sensor and soil samples with various roughness states (R1– the lowest, R2 – the medium, R3 – the highest roughness state) on their spectra level, under laboratory condition. Studied soil samples were illuminated at three light source zenith angles (θs equal to 20°, 40°, 60°) and observed by the sensor to the nadir, from various distances (Hs) from 10 to 54 cm. These dark (the Mollic Gleyic Fluvisol) and light (the Cutanic Stagnic Luvisol) soil materials with their minimum roughness were characterized by diffused reflectance spectra. The relative differences (RD) between the spectra level of soil samples with R1, R2, R3 roughness states and the diffused reflectance level of soil materials were calculated with 1 nm interval in range of 420–2,300 nm. Higher roughness state and higher θs, result in higher RD. Thus, for the dark and light soil samples with R3 roughness state and illuminated at θs= 60°,the RD are the highest reached 63 and 39% (Hs=54 cm) and reached 77 and 63% (Hs=10 cm), respectively. The spectra level of the soil samples in R1 and R3 roughness states, illuminated at θs=20° and soil samples with R1 roughness, illuminated at θs=60°, reached a stable level, at a specific Hs. It means, that a spectra does not significantly change with a further increase Hs. However, the soil samples in R3 roughness, illuminated at θs=60° have not reached the stability.

Źródło:

Polish Journal of Soil Science; 2016, 49, 2
0079-2985

Pojawia się w:

Polish Journal of Soil Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Prawdopodobieństwo przejścia i efektywna liczba próbek cyfrowego sygnału z multipleksacją OFDM
Transition probability and effective number of samples of a digital OFDM signal

Autorzy:

Rudziński, A.

Powiązania:

https://bibliotekanauki.pl/articles/317404.pdf

Data publikacji:

2012

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

przetwornik cyfrowo-analogowy
multipleksacja OFDM
prawdopodobieństwo przejścia
efektywna liczba próbek
digital-to-analog converter
OFDM
transition probability
effective number of samples

Opis:

W artykule przedstawiono wyprowadzenie wyrażenia opisującego efektywną liczbę próbek sygnału cyfrowego z multipleksacją OFDM. Wyprowadzenie oparte jest na obliczeniu prawdopodobieństwa przejścia dla tego sygnału. Otrzymane wyrażenie wskazuje wprost zależności między efektywną liczbą próbek a parametrami sygnału i stanowi uzupełnienie modelu teoretycznego.
This paper presents a derivation of the expression for the effective number of samples of a digital signal with OFDM coding. The derivation is based on the calculation of transition probability for the signal. The obtained expression explicitly reveals dependencies of the effective number of samples on parameters of the signal and supplements the theoretical model discussed previously.

Źródło:

Telekomunikacja i Techniki Informacyjne; 2012, 1-2; 58-66
1640-1549
1899-8933

Pojawia się w:

Telekomunikacja i Techniki Informacyjne

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Positron Annihilation in Steel Samples Deformed by Uniaxial Tension

Autorzy:

Rudzińska, W.
Szuszkiewicz, M.
Bujnarowski, G.
Kluza, A.

Powiązania:

https://bibliotekanauki.pl/articles/1812548.pdf

Data publikacji:

2008-05

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.70.Bj

Opis:

Angular distributions of the positron annihilation quanta were measured for steel ST2 SAL samples deformed by uniaxial tension up to different deformation degrees. The dependences of the S parameter on the relative elongation of the samples are presented. The positron annihilation data for steel are compared with the results obtained previously for polycrystalline iron samples deformed by uniaxial tension up to different deformation degrees in the proportionality and limited proportionality regions.

Źródło:

Acta Physica Polonica A; 2008, 113, 5; 1507-1510
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Investigations of Some Properties of Material Samples Taken from the Aircraft Withdrawn from Service

Autorzy:

Klysz, S.
Gmurczyk, G.
Lisiecki, J.

Powiązania:

https://bibliotekanauki.pl/articles/97859.pdf

Data publikacji:

2010

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Opis:

Materials used in aircraft structures have (should have) certificates confirming their quality. Nowadays, in majority of cases, the symbols of materials used in construction of aircraft give detailed information about their mechanical properties. This general material data is gathered in the widely available engineering material data bases. In the case of materials used in Polish aviation several decades ago, there is no reliable material data crucial for crack propagation estimation or fatigue life estimation among others. Examinations conducted in many different research institutes are not systematized and are not gathered in a remotely accessible data base. As aging aircraft are concerned, the influence of service time (often exceeding thirty years) on the overall material properties is a very important factor. It may be too crude estimation to use standard material properties when it comes to aging aircraft fleet. Some experimental works concerning this topic are published from time to time and they are always very welcome. In the Air Force Institute of Technology experimental tests were carried out to determine some specific properties of the materials used in the PZL-130 Orlik aircraft structure. The samples were obtained from aircraft withdrawn from service. This enabled estimating the difference in material properties over time. The following tests were conducted during the experiments:
- fatigue tests (crack propagation examination)
- static tests.
The analyzed material was taken from the central upper part of the aircraft wing. The experiment was conducted with the MTS machine with the 810.23 system.

Źródło:

Fatigue of Aircraft Structures; 2010, 2; 52-58
2081-7738
2300-7591

Pojawia się w:

Fatigue of Aircraft Structures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Improving the efficiency of fluidized bed comminution of limestone samples

Autorzy:

Wysocki, D.

Powiązania:

https://bibliotekanauki.pl/articles/1818778.pdf

Data publikacji:

2021

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

comminution
grinding
limestone
desulfurization
rozdrabnianie
mielenie
wapień
odsiarczanie

Opis:

Purpose: The aim of the research was to describe the properties and methods of using limestone for desulfurization of flue gases and to analyse the process of fluidized bed comminution and the influence of selected parameters and stand modification on quality of product of fluidized bed comminution. Design/methodology/approach: Tests of the grinding process on the fluidized bed were carried out using a modified fluid bed mill for operational variable parameters and their results were compared with the results received before modification. The modification of the test stand consisted of increasing the height of the grinding chamber, which ensured an increase in the volume of the fluidized layer where the grinding process takes place. Findings: Main parameters that determined the effects of comminution in the analyzed case were: overpressure of working air and the rotor speed of the classifier. The introduction of the modifications of the test stand ensured an increase in the volume of the fluidized layer in which the grinding process takes place. As well as a greater gravitational classification, which caused larger grains to be stopped in the grinding chamber and shift of characteristics of grain compositions towards finer grains. Research limitations/implications: It is assumed that the diameter of sorbent grains used in the fluidized bed can not exceed 6 mm. The granularity of the offered sorbents ranges from 0.1 mm to 1.2 mm. The quality of the desulfurization process depends on the overall granulation of used sorbent grains. Practical implications: Appropriately selected sorbent grains used in wet and dry flue gas desulphurisation plants ensure improved efficiency of the desulphurisation process and lower operating costs of the installation. Originality/value: Thanks to the comminution method used, a sorbent is obtained without impurities and with an increased specific surface, which can be used in fluidized bed boilers.

Źródło:

Journal of Achievements in Materials and Manufacturing Engineering; 2021, 107, 1; 5--14
1734-8412

Pojawia się w:

Journal of Achievements in Materials and Manufacturing Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Panel, czyli ujęcie dynamiczne w badaniach społecznych

Autorzy:

Markiewicz, Paulina

Powiązania:

https://bibliotekanauki.pl/articles/2050782.pdf

Data publikacji:

2014-08-31

Wydawca:

Wydawnictwo Adam Marszałek

Tematy:

diachronic research
panel method
social dynamic
social change
sample’s mortality

Opis:

The article presents a specificity of dynamic research based on panel studies. On the basis of chosen examples, including long-term Polish nationwide research, the field of panel studies application as well as difficulties in the implementation of the studies were indicated. The main purpose of this publication was to present some aspects of methodical research tools of panel study projects, that are conducted both by individual researchers and research teams. Basing on examples, panel studies diversified in terms of scope, measurement techniques, sampling and problem assumptions, were presented. The article starts with the research conducted by Ryszard Borowicz at the turn of the sixties and seventies, that includes one typical study cycle of Nicolaus Copernicus University – the research coveres the whole education cycle. Then, the article describes Polish Panel Survey POLPAN research that has been conducted since the end of the eighties. Besides determining individual trajectory of Polish fortunes, the research introduces innovative approach to social structure in a dynamic perspective. The Social Diagnosis panel studies project, of which the first round of studies was held in 2000, was in turn presented in this article with a special emphasis on defining and sampling methods, as well as mechanisms of dealing with the sample’s “mortality”. The last example included in the article, presents the research conducted by Zielonogórski Center (Ośrodek Zielonogórski), in which the panel studies method is particularly applied to the field of pedagogical studies. The comparison of such different projects, in particular studies from the seventies and contemporary studies, allowed to indicate several points differentiating research tools, and in addition, opportunities that are created by using modern technologies in the area of data collection, reaching respondents and dissemination of study results.

Źródło:

Kultura i Edukacja; 2014, 4(104); 332-348
1230-266X

Pojawia się w:

Kultura i Edukacja

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Wodorowanie próbek materiałów konstrukcyjnych
Hydrogenation of samples of technological materials

Autorzy:

Łukaszewicz, J.
Łapiński, Z.

Powiązania:

https://bibliotekanauki.pl/articles/234812.pdf

Data publikacji:

2007

Wydawca:

Wojskowy Instytut Techniczny Uzbrojenia

Tematy:

wodorowanie
materiały konstrukcyjne
hydrogenation
constructional materials

Opis:

W artykule przedstawiono wpływ wodorowania na mikrostrukturę materiałów konstrukcyjnych oraz wykorzystanie tego procesu podczas określania przydatności eksploatacyjnej tych materiałów.
The influence of the hydrogenation process into the microstructure of technological materials and their further usefulness in the final article functionality is presented in the paper.

Źródło:

Problemy Techniki Uzbrojenia; 2007, R. 36, z. 101; 127-141
1230-3801

Pojawia się w:

Problemy Techniki Uzbrojenia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Simultaneous transmission and scattering Mössbauer measurements of powder samples

Autorzy:

Fornal, P.
Stanek, J.

Powiązania:

https://bibliotekanauki.pl/articles/148213.pdf

Data publikacji:

2007

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

methodology of Mössbauer spectroscopy
CEMS
micro-powders

Opis:

A vertical experimental set-up for simultaneous recording transmission and scattering Mössbauer spectra is described. Application of the apparatus for the study of model powder mixture of two components with different grain sizes shows differences in the relative intensity ratio of these fractions in absorption and conversion electron Mössbauer spectroscopy (CEMS) spectra. This effect, explained as a result of the size selectivity of CEMS technique, is parameterized by the grain radius ratio of components. The possible application for investigation of isolated surface nano- and microobjects is discussed.

Źródło:

Nukleonika; 2007, 52, supl. 1; 13-16
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

FT-IR/PAS Studies of Lunar Regolith Samples

Autorzy:

Pasieczna-Patkowska, S.
Dąbrowski, A.
Robens, E.
Ryczkowski, J.

Powiązania:

https://bibliotekanauki.pl/articles/1811545.pdf

Data publikacji:

2008-12

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

82.80.Gk

Opis:

This paper describes investigations of the surface properties of lunar regolith powder samples from the Apollo 11, 12, and 16 missions, respectively. For this part of studies conducted at the Faculty of Chemistry, Maria Curie-Skłodowska University a Fourier transform infrared photoacoustic spectroscopy was applied.

Źródło:

Acta Physica Polonica A; 2008, 114, 6A; A-163-A-168
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Main physical-mechanic properties of concrete samples taken from Bražuolė - first removed dam in Lithuania
Główne właściwości fizykomechaniczne próbek betonu pobranych z Bražuolė - pierwszej usuniętej zapory na Litwie

Autorzy:

Sadzevicius, R.
Adamonyte, I.
Gabrys, K.
Kucharski, M.

Powiązania:

https://bibliotekanauki.pl/articles/2084095.pdf

Data publikacji:

2021

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

concrete samples
dam removal
concrete compression strength
density
water absorption by
weight

Opis:

According to historical records, the dam was first built in the 19th century to power a water mill. In this article, the main attention focused on the main physical-mechanic properties of concrete samples taken from Bražuolė dam – first officially removed dam in Lithuania (in 2020). The purpose of these investigations based on field research is to establish actual quantities of compression strength, density, and water absorption by weight of concrete used in the retaining walls of Bražuolė dam. The concrete water absorption by mass (Wm) and compression strength (fck) testing results based on research data of concrete samples from Bražuolė hydroscheme retaining walls do not meet the requirements of currently valid technical construction regulation.

Źródło:

Acta Scientiarum Polonorum. Architectura; 2021, 20, 4; 11-19
1644-0633

Pojawia się w:

Acta Scientiarum Polonorum. Architectura

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Zastosowanie teorii perkolacji do wyznaczania mocy wydzielanej na próbkach kompozytowych
Application of percolation theory for determination of power emitted on composite samples

Autorzy:

Frączak, P. S.
Czajkowski, A. A.

Powiązania:

https://bibliotekanauki.pl/articles/135872.pdf

Data publikacji:

2015

Wydawca:

Wyższa Szkoła Techniczno-Ekonomiczna w Szczecinie

Tematy:

prąd upływnościowy powierzchniowy
próbki kompozytowe
teoria perkolacji
moc pozorna
symulacja
MathCAD
surface leakage current
composite samples
percolation theory
apparent power
simulation

Opis:

Wstęp i cele: W pracy przedstawiono sposób analityczno-numeryczny wyznaczania wartości mocy wydzielanej na próbkach walcowych kompozytowych przez prąd upływnościowy powierzchniowy w ujęciu teorii perkolacji. W przyjętym modelu sformułowano w zapisie macierzowym prąd perkolacji, impedancję i moc wydzielaną na powierzchni próbek kompozytowych. Celem pracy było wyznaczenie wartości mocy traconej na powierzchni próbek kompozytowych. Materiał i metody: Podstawą opracowania była literatura dotycząca perkolacji. Badania starzeniowe oparto metodzie MGR (ang. Merry-Go-Round) dla próbek kompozytowych. Zastosowano metodę tak analityczno-numeryczną jak i doświadczalną. Wyniki opracowano numerycznie w programie MathCAD. Wyniki: W wyniku obliczeń analityczno-numerycznych uzyskano wartości mocy pozornej wydzielanej na powierzchni badanych próbek kompozytowych. Opracowano graficznie charakterystyki mocy pozornej. Wniosek: Podczas badania starzeniowego próbki kompozytowej metodą MGR, po osiągnięciu progu perkolacji następuje wzrost mocy pozornej wydzielanej na jej powierzchni.
Introduction: Analytical and numerical determination of power occurring on cylinder composite samples by surface leakage current in the aspect of percolation theory have been presented in the paper. In the given model the value of percolation current, impedance and power occurring on the samples have been defined in matrix notation. Some determinations of power in the aspect of percolation theory have been elaborated in the paper. The main aim of the paper is some determination of apparent power values on the surface of composite samples. Material and methods: The basis of the study was literature contained percolation theory. The study was based on aging method MGR (Merry-Go-Round) for composite samples. In the paper have been used not only the analytical and numerical but also some experimental method. The results have been numerically elaborated in the MathCAD program. Results: Using some analytical and numerical calculations have been obtained the values of apparent power emitted on the surface of the tested composite samples. The apparent power characteristics have been graphically elaborated in the study. Conclusion: During the senescence study of the composite sample by MGR method, after reaching the percolation threshold there is an increase apparent power emitted on its surface.

Źródło:

Problemy Nauk Stosowanych; 2015, 3; 107-116
2300-6110

Pojawia się w:

Problemy Nauk Stosowanych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Bioactivity samples with SiO2-Y2O3 ceramic layers produced by sol-gel method

Autorzy:

Mazur-Nowacka, Anna
Qasem, Badr

Powiązania:

https://bibliotekanauki.pl/articles/284313.pdf

Data publikacji:

2019

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Źródło:

Engineering of Biomaterials; 2019, 22, no.153; 74
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Enzyme profile in samples of bacterial cellulose film treated with Trametes versicolor and Coniophora puteana

Autorzy:

Betlej, Izabela

Powiązania:

https://bibliotekanauki.pl/articles/2166520.pdf

Data publikacji:

2021

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

bacterial cellulose
Basidiomycetes
enzymes

Opis:

Profile of enzymes in samples of bacterial cellulose film treated with Trametes versicolor and Coniophora puteana. The paper presents the results of research showing the profile of hydrolytic enzymes synthesized by fungi that cause decomposition of wood during growth on film samples made of bacterial cellulose. The performed analyzes allowed for the conclusion that the presence of cellulose in the culture medium stimulates the fungal cells to synthesize full groups of enzymes that are not produced on the agar-maltose medium. Among the synthesized enzymes, both species of fungi produced two enzymes: β - glucosidase and N-acetyl-β - glucuronidase with the highest observed activity.
Profil enzymów w próbkach folii celulozy bakteryjnej, poddanych działaniu grzybów Trametes versicolor oraz Coniophora puteana. W pracy przedstawiono wyniki badań obrazujące profil enzymów hydrolitycznych, syntetyzowanych przez grzyby powodujące rozkład drewna w trakcie wzrostu na próbkach folii wytworzonych z celulozy bakteryjnej. Wykonane analizy pozwoliły na stwierdzenie, że obecność celulozy w podłożu hodowlanym stymuluje komórki grzybów do syntezy pewnych grup enzymów, które nie są wytwarzane na podłożu agarowo-maltozowym. Spośród syntetyzowanych enzymów obydwa gatunki grzybów wytwarzały enzymy: β – glukozydazę i N-acetylo- β – glukuronidazę o najwyższej, stwierdzonej aktywności.

Źródło:

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2021, 116; 141--147
1898-5912

Pojawia się w:

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Technical experimental equipment for making porous wire samples

Autorzy:

Jakubowski, A.
Dounar, S.

Powiązania:

https://bibliotekanauki.pl/articles/27315847.pdf

Data publikacji:

2018

Wydawca:

STE GROUP

Tematy:

wire
mandrel
winding
radial reduction
fixing of the ends

Opis:

Original experimental technical equipment for making samples in the form of permeable tubes of porous material, i.e. coiled wire. The article describes the construction of the equipment, the processes of forming and pressing the wire semi-product and methods of fixing the ends of the wire product.

Źródło:

New Trends in Production Engineering; 2018, 1, 1; 669-674
2545-2843

Pojawia się w:

New Trends in Production Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Structural Characterization of Some Table Salt Samples by XRD, ICP, FTIR and XRF Techniques

Autorzy:

Yalçin, Ş.
Mutlu, İ.

Powiązania:

https://bibliotekanauki.pl/articles/1490744.pdf

Data publikacji:

2012-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

61.05.cp

Opis:

In this study, we have investigated structure and impurities of six different salts which have a great importance in our everyday life, namely source salt, Himalayan salt, rock salt, sea salt, lake salt and reduced sodium salt (minsalt) by means of different analytical methods, namely X-ray powder diffraction, scanning electron microscope-energy dispersive X-ray spectroscopy, inductive coupling plasma optic emission spectroscopy, X-ray fluorescence spectrometer and the Fourier transform infrared spectroscopy. With the light of obtained results, suitability and performance of the different analytical methods were discussed in some details.

Źródło:

Acta Physica Polonica A; 2012, 121, 1; 50-52
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Manganese and its speciation in environmental samples using hyphenated techniques: A review

Autorzy:

Jablonska-Czapla, M.

Powiązania:

https://bibliotekanauki.pl/articles/15404.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza

Tematy:

manganese
speciation
environmental sample
hyphenated technique

Opis:

Manganese is one of the most frequently used materials in industry, hence its elevated levels in the surrounding environment. Manganese is an essential nutrient, important in biochemical reactions of several enzymes; on the other hand, it can cause both acute and chronic diseases (eg. manganism). The importance of manganese in living systems remains poorly explored. Manganese compounds share with certain other elements the property of being essential for life, but certain manganese species and large doses are toxic. Manganese plays an important role in iron metabolism and is required for the brain’s normal function. Chemical speciation is an important subject in the environmental protection as well as in toxicological and analytical research because toxicity, availability and reactivity of trace elements depend on the chemical forms in which they occur. This study deals with effects of manganese and manganese speciation forms on living organisms, particularly in aquatic environments. The review presents manganese speciation methods using sophisticated hyphenated techniques.The hyphenated techniques, in which a separation method is coupled with multi-dimensional detectors, have become a useful alternative. These techniques allow for a qualitative and quantitative analysis of the sample composition, wherein manganese may be present in various speciation forms. The article provides many examples of the hyphenated technique application in manganese speciation analysis.

Źródło:

Journal of Elementology; 2015, 20, 4
1644-2296

Pojawia się w:

Journal of Elementology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

Emission of Self-Assembled CdTe/ZnTe Quantum Dot Samples with Different Cap Thickness

Autorzy:

Nowak, S.

Powiązania:

https://bibliotekanauki.pl/articles/1791338.pdf

Data publikacji:

2009-11

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

78.55.Et
78.67.Hc

Opis:

Photoluminescence measurements on CdTe/ZeTe self-assembled quantum dot samples with different cap thickness values (18-110nm) were performed at 1.8 K at varying excitation levels. The shape of macrophotoluminescence spectra did not altered notably with the excitation power. The spectra exhibited interference fringes related to the total barrier thickness. Simulation of the fringes confirmed the barrier thickness determined during the growth. The minimal amplitude of the fringes was observed for the cap thickness corresponding approximately to a quarter of the emission wavelength in the barrier material. Maximum emission intensity occurred for the largest thickness of the cap, i.e., 110 nm. We attribute this result to the influence of the surface recombination centers.

Źródło:

Acta Physica Polonica A; 2009, 116, 5; 890-892
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Dobór procesu kondycjonowania próbek zgodnie z wymaganiami kwalifikacji kompozytów polimerowych do zastosowań w konstrukcjach lotniczych
Selection of samples conditioning process in Accordance with the requirements of qualification polymer matrix composites for use in aircraft construction

Autorzy:

Kaczorowska, E.

Powiązania:

https://bibliotekanauki.pl/articles/213263.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

kondycjonowanie
klimatyzowanie
kwalifikacja kompozytowych materiałów lotniczych
samples conditioning
qualifications of materials
composite
aerospace

Opis:

W artykule przedstawiono sposób kondycjonowania próbek wedlug stosowanych na świecie regulacji dotyczących kwalifikacji kompozytowych materiałów lotniczych (FAA – Federalna Administracja Lolnictwa - Federal Aviation Administration, EASA - Europejska Agencja Bezpieczeństwa Lotniczego - European Aviation Safety Agency, MIL-HNBK – Podręcznik Wojskowy - Military Handbook). Przeprowadzono proces kondycjonowania próbek w komorze klimatycznej o zadanej temperaturze oraz wilgotnosci zgodnie z normq ASTM D5229. Przeprowadzono obliczenia w celu doboru parametrów klimatyzowania oraz dokonano weryfikacji stanu nasycenia próbek. Wykonane obliczenia zwróciły wartość współczynnika dyfuzji, dla badanych próbek wytworzonych w technologii bezautoklawowej z prepregu węglowo-epoksydowego CYTEC MTM46. Znajomość współczynnika dyfuzji pozwolila zmniejszyć czas interwałowego ważenia o 30 %. Dokonano także selekcji rodzajow substancji chemicznych, które mogą mieć wpływ na trwałość materiału kompozytowego. Podsumowano i porównano stosowane procesy kondycjonowania według regulacji stosowanych do kwalifikacji materiałów lotniczych, oraz przeprowadzony process klimatyzowania według normy ASTM D 5229.
Kind of the samples conditioning, used on the world according to the regulations of the qualifications of composite aerospace materials (FAA - Federal Aviation Administration, EASA- European Aviation Safety Agency, MIL-HNBK - Military Handbook), is presented in this article. The process of conditioning the samples in a climate chamber set temperature and humidity in accordance with the ASTM D5229 was carried out. Calculations were carried out in order to select the parameters of conditioning and a verification of the saturation of the samples. Types of chemicals that may affect the durability of the composite material have also been selected. The processes of conditioning according to the regulations applicable to the qualification of aerospace materials and conditioning process according to the ASTM D 5229 were summarized and compared. Keywords: samples conditioning, qualifications of materials, composite, aerospace.

Źródło:

Prace Instytutu Lotnictwa; 2016, 3 (244); 83-89
0509-6669
2300-5408

Pojawia się w:

Prace Instytutu Lotnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Comparison of the efficiency of drawing samples with and without replacement when the variance of the general population is unknown

Autorzy:

Koźniewska, I.

Powiązania:

https://bibliotekanauki.pl/articles/969210.pdf

Data publikacji:

1957

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Źródło:

Colloquium Mathematicum; 1956-1957, 4, 2; 232-238
0010-1354

Pojawia się w:

Colloquium Mathematicum

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Hall Mobility Field Effect in Two Layer Conductivity Samples

Autorzy:

Mekys, A.
Storasta, J.
Zindulis, A.
Smilga, A.
Balakauskas, S.

Powiązania:

https://bibliotekanauki.pl/articles/1812055.pdf

Data publikacji:

2008-10

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

84.37.+q

Opis:

Classical Hall mobility experimental setup was applied for samples with parallel plane (sandwich) variable conductivity layers. The measured effective Hall mobility strongly depends on applied electric field and does not characterise the real carrier mobility. Numerical modelling explains the effect as a consequence of electric field redistribution and lowering at Hall contacts. Measurement of carrier mobility in such structures is suggested.

Źródło:

Acta Physica Polonica A; 2008, 114, 4; 903-912
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 58.

Tytuł:

Differences in the relationship between bacterial count decay and storage time in Antarctic freshwater samples

Autorzy:

Allende, Luz

Powiązania:

https://bibliotekanauki.pl/articles/2051915.pdf

Data publikacji:

2006

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Antarctica
bacterioplankton
count decay
storage

Źródło:

Polish Polar Research; 2006, 27, 1; 63-69
0138-0338
2081-8262

Pojawia się w:

Polish Polar Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 59.

Tytuł:

Phylogenetic characterization of Canine Parvovirus VP2 partial sequences from symptomatic dogs samples

Autorzy:

Zienius, D.
Lelesius, R.
Kovaliauskis, H.
Stankevicius, A.
Salomskas, A.

Powiązania:

https://bibliotekanauki.pl/articles/31615.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Opis:

The aim of the present study was to detect canine parvovirus (CPV) from faecal samples of clinically ill domestic dogs by polymerase chain reaction (PCR) followed by VP2 gene partial sequencing and molecular characterization of circulating strains in Lithuania. Eleven clinically and antigen-tested positive dog faecal samples, collected during the period of 2014-2015, were investigated by using PCR. The phylogenetic investigations indicated that the Lithuanian CPV VP2 partial sequences (3025-3706 cds) were closely related and showed 99.0-99.9% identity. All Lithuanian sequences were associated with one phylogroup, but grouped in different clusters. Ten of investigated Lithuanian CPV VP2 sequences were closely associated with CPV 2a antigenic variant (99.4% nt identity). Five CPV VP2 sequences from Lithuania were related to CPV-2a, but were rather divergent (6.8 nt differences). Only one CPV VP2 sequence from Lithuania was associated (99.3% nt identity) with CPV-2b VP2 sequences from France, Italy, USA and Korea. The four of eleven investigated Lithuanian dogs with CPV infection symptoms were vaccinated with CPV-2 vaccine, but their VP2 sequences were phylogenetically distantly associated with CPV vaccine strains VP2 sequences (11.5-15.8 nt differences). Ten Lithuanian CPV VP2 sequences had monophyletic relations among the close geographically associated samples, but five of them were rather divergent (1.0% less sequence similarity). The one Lithuanian CPV VP2 sequence was closely related with CPV-2b antigenic variant. All the Lithuanian CPV VP2 partial sequences were conservative and phylogenetically low associated with most commonly used CPV vaccine strains.

Źródło:

Polish Journal of Veterinary Sciences; 2016, 19, 1
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Effective Measyrand Estimators for Samples of Trapezoidal PDF-s

Autorzy:

Warsza, Z. L.

Powiązania:

https://bibliotekanauki.pl/articles/384747.pdf

Data publikacji:

2012

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów

Tematy:

estimators of probability density function
trapezoidal PDF
mid-range
uncertainty evaluation

Opis:

This paper is final overview of investigations on the accuracy of basic estimators of trapezoidal probability distribution samples of the measured data. For symmetrical trapezoidal PDF of straight as well concaved sides, using Monte-Carlo method of simulation, the standard deviation (SD) of linear 1- and 2-component estimators are evaluated. Approaches for theirs evaluation are proposed. It is established that in the ratio of upper and bottom bases of trapezoidal PDF in the range from 1 to 0,35 the mid-range value has smaller standard deviation (SD) than the mean value and median. It is find then for the whole family of the symmetric linear trapezoidal PDF more accurate than above single element estimators are two-component (2C) estimators as the linear form of the mean and mid-range values of the sample. Their coefficients are found, properties discussed and formulas of SD are given. The new simplified 2C-estimator of equal coefficients is also proposed. These estimators successfully extend estimation of the measurand value as the sample mean and description of its accuracy by the uncertainty type A recommended by the international guides of uncertainty evaluation in measurement GUM-2008 [1], EA-4/02 [2] and by Handbook NASA [3]. Approaches of described below investigations could be effectively applied also for other models of convoluted PDF-s.

Źródło:

Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 1; 8-14
1897-8649
2080-2145

Pojawia się w:

Journal of Automation Mobile Robotics and Intelligent Systems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Study on buffering capacity and organic matter of some soil samples from Rungicherra Tea-Estate, Bangladesh

Autorzy:

Zamir, R.
Islam, N.
Hossain, M.F.

Powiązania:

https://bibliotekanauki.pl/articles/11819.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Opis:

In this study, soil samples from three different hills of three topographic positions were evaluated on the basis of buffer capacity and organic matter. Maximum soil samples were found to have good buffer capacity where soil samples of topographical positions hill base and hill top showed maximum and minimum values respectively, leaving hill slope samples in medium value of buffer capacity. Our study suggested this variation of buffer capacity may be due to the differences of organic matter amongst the topographical positions and profiles.

Źródło:

International Letters of Natural Sciences; 2015, 44
2300-9675

Pojawia się w:

International Letters of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Logiczna analiza wypowiedzi dotyczących braku pozytywnych i negatywnych odpowiedzi
Logical analysis of language samples regarding lack of positive and negative responses

Autorzy:

Lapis, Włodzimierz

Powiązania:

https://bibliotekanauki.pl/articles/1036408.pdf

Data publikacji:

2007-06-16

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Opis:

Ninety-nine statements concerning the lack of positive or negative reply were gathered from Polish Internet sites in this article and they were analysed in terms of their logical meaning (whether they denoted acceptance or lack of it). We also analysed in which situations we are dealing with such coincidences and what exactly is the touchstone that enables us to take this classification decision.

Źródło:

Investigationes Linguisticae; 2006, 14; 147-161
1426-188X
1733-1757

Pojawia się w:

Investigationes Linguisticae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

A comparative study of some chemical components of various milk samples in Yobe State, Nigeria

Autorzy:

Khanam, Sabina

Powiązania:

https://bibliotekanauki.pl/articles/1077039.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

camel
chemical components
cow
goat
milk

Opis:

Milk is an important ingredient in our diet as it is very good source of calcium. This study was carried out to investigate the chemical components of milk samples collected from cow, camel and goat in Yobe State, Nigeria. Chemical components as moisture content, dry matter and ash content were determined. The generated data show that goat milk has the highest moisture content (88.41 ±0.20) and ash content (0.75 ±0.01), while Camel milk has lowest moisture content (84.73 ±0.22) and ash content. Dry matter is highest in camel milk (15.27 ±0.22) and lowest in goat milk (11.59 ±0.20).

Źródło:

World News of Natural Sciences; 2019, 23; 104-109
2543-5426

Pojawia się w:

World News of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Detection of gastric Helicobacter spp. in stool samples of dogs with gastritis

Autorzy:

Jankowski, M.
Spuzak, J.
Kubiak, K.
Glinska-Suchocka, K.
Biernat, M.

Powiązania:

https://bibliotekanauki.pl/articles/30957.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Opis:

The aim of this study was to determine the prevalence and identify the species of gastric Helicobacter in the stool of dogs with gastritis. The study was carried out on thirty dogs of different breeds, of both genders and of various ages, diagnosed with gastritis. Helicobacter spp. was detected in stool samples using the nested-PCR method. Helicobacter bacteria were identified in stool samples from seven (23.3%) dogs. Helicobacter heilmannii was found to be the most common species of gastric Helicobacter. Helicobacter salomonis was identified much less frequently, while Helicobacter felis, Helicobacter pylori and Helicobacter bizzozeronii were not detected in any of the samples.

Źródło:

Polish Journal of Veterinary Sciences; 2016, 19, 2
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Identification of the reinforcement bars in concrete samples using eddy currents thermography

Autorzy:

Różański, Leszek
Ziopaja, Krzysztof

Powiązania:

https://bibliotekanauki.pl/articles/114038.pdf

Data publikacji:

2019

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

active IR thermography
eddy currents
reinforcement bars

Opis:

It is known that sub-surface discontinuities of matter, internal voids, inclusions of other materials or delaminations of the structure can be revealed on the surface temperature distribution. An important element of IR thermography investigations is the application of an appropriate heat source to heat the examined object. This article discusses the use of eddy currents for identification of reinforcing bars in concrete samples. The experiments have the laboratory character and are used primarily for qualitative assessment of the influence of bar diameter and concrete cover thickness on the identification of reinforcement in concrete elements. In order to induce a transient heat flow in tested samples, the eddy currents (EC) generator from IFF GmbH was used. After the pulse was completed, the surface temperature distribution was recorded using FLIR T620 infrared camera. The following experimental studies validate the practical application of active IR with EC to locate and assess the technical condition of reinforcing bars in reinforced concrete structures in buildings and civil engineering structures.

Źródło:

Measurement Automation Monitoring; 2019, 65, 2; 55-59
2450-2855

Pojawia się w:

Measurement Automation Monitoring

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Preparation of Samples used in Fatigue Testing of Aircraft Materials

Autorzy:

Manaj, W.
Wronicz, W.
Michałowski, A.

Powiązania:

https://bibliotekanauki.pl/articles/98020.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

mechanical processing
stress measurement
X-ray diffraction

Opis:

The application of a new type of alloy requires the evaluation of its properties, which is typically achieved with destructive methods. For this purpose, among others, static and fatigue mechanical tests are performed. Tests are performed on standardized samples in a way which reflects the level of stress occurring in real elements. These tests should limit random errors associated with sample preparation. For this reason the proper preparation of samples is crucial, not only in terms of their geometric dimensions but also in terms of the residual stress level. A sample preparation process was developed, involving checking samples’ surface for cracks, scratches, roughness, and the state of stress. The measurements are performed with nondestructive methods so as not to affect the proceeding research. In this study, the residual stress and features of a mechanically prepared surface were characterized. The specimens were subjected to various surface finishes mainly, lathe turning and grinding surface conditions. The effects of residual surface stress (measured by XRD) were studied after machining and polishing.

Źródło:

Fatigue of Aircraft Structures; 2015, 7; 66-68
2081-7738
2300-7591

Pojawia się w:

Fatigue of Aircraft Structures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Monte Carlo simulation of the positron implantation profiles in the layered samples

Autorzy:

Dryzek, J.
Horodek, P.

Powiązania:

https://bibliotekanauki.pl/articles/146332.pdf

Data publikacji:

2010

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

positron implantation
implantation profile
GEANT4 tool kit

Opis:

Theoretical studies of the positron implantation profiles in the layered samples are presented. Simulations performed using a GEANT4 tool kit revealed accumulation of positrons in denser layer embedded by less dens environment. This effect is significant for implantation profiles of slow positrons formed in a beam. Nevertheless, it is also present in conventional experiments, where positrons are emitted from radioactive nuclei. In some cases the diffusion process, which follows the implantation and thermalization processes, can smear this effect. However, defects on the interfaces or differences in the positron affinity can sustain it.

Źródło:

Nukleonika; 2010, 55, 1; 13-16
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Biodiversity of museum and bulk field samples compared: The Eocene Chiampo sponge fauna, Lessini Mountains, Italy

Autorzy:

Frisone, V.
Pisera, A.
Preto, N.
Kiessling, W.

Powiązania:

https://bibliotekanauki.pl/articles/21824.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Opis:

The sponge body fossils from the Lutetian (Eocene) of Chiampo Valley in north-eastern Italy, Lessini Mountains, exhibit a high diversity. The fauna, comprising 32 species, was recently described in a systematic study based on museum material. Here we compare diversity measures and rank-abundance distributions between the museum material and new material from random surface collection at the original sampling site. Not surprisingly, we find that selectively collected museum material tends to have greater diversity and evenness than bulk field samples. Nevertheless, abundance rank - orders are maintained between samples. Bulk field sampling revealed hexactinellids to be strongly dominant over lithistids, which suggests a deep-water setting of greater than 200 m water depth.

Źródło:

Acta Palaeontologica Polonica; 2018, 63, 4
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

Some aerodynamic properties of selected samples of wheat, rye, and barley seeds
Niektóre właściwości aerodynamiczne wybranych prób ziarna pszenicy, żyta i jęczmienia

Autorzy:

Bogaczynski, K.

Powiązania:

https://bibliotekanauki.pl/articles/10186.pdf

Data publikacji:

1975

Wydawca:

Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie

Opis:

Opracowano metodę wyznaczania szybkości unoszenia i obliczenia, współczynnika oporu aerodynamicznego ziarna zbóż. Stwierdzono, że wartość współczynnika oporu aerodynamicznego maleje wraz ze wzrostem wielkości ziarna i wynosi dla ziarna bardzo drobnego ok. 1,0 a dla ziarna dużego 0,66 przy prędkości unoszenia nie przekraczającej dla pszenicy 9,3 m/s, a dla żyta i jęczmienia 8,7 m/s. Dane zebrane w pracy wskazują, że klasyfikacja pneumatyczna umożliwia sortowanie ziarna zbóż na frakcje o różnej masie poszczególnych ziarn.

Źródło:

Acta Alimentaria Polonica; 1975, 01, 2
0137-1495

Pojawia się w:

Acta Alimentaria Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

Nowe metody mineralizacji i oznaczania zawartości mikroelementów w próbkach biologicznych
Modern methods of digestion and micronutrient determination in biological samples

Autorzy:

Gorecka, H.
Gorecki, H.

Powiązania:

https://bibliotekanauki.pl/articles/810569.pdf

Data publikacji:

2000

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Opis:

W pracy przedstawiono wyniki badań nad zastosowaniem do analizy metali w próbkach środowiskowych i biologicznych procedury oznaczania metali metodą spektrometrii plazmowej (ICP), w próbkach uprzednio rozłożonych w zamkniętym systemie mikrofalowym. Przedstawiono również ocenę stosowanych obecnie metod oznaczania metali i rozkładu próbek. Eksperymentalnie porównano możliwości oznaczania metali stosując kombinację rozwiązań aparaturowych, takich jak emisyjna spektrometria plazmowa (ICP-OES) z nebulizacją pneumatyczną - ICP- OES PN, emisyjna spektrometria plazmowa (ICP-OES) z nebulizacją ultradźwiękową - ICP-OES USN oraz masowa spektrometria plazmowa indukcyjnie sprzężona (ICP-MS) o wysokiej rozdzielczości. Przedstawiono wyznaczone progi wykrywalności dla mikroelementów i metali uznawanych za toksyczne. Stwierdzono, że techniką ICP-MS dla większości pierwiastków możliwe jest oznaczanie na poziomie µg·kg⁻¹-ng·kg⁻¹ . Również kombinacją metody ICP-OES USN możliwe jest oznaczanie wielu pierwiastków na poziomie µg·kg⁻¹. Metodą ICP-MS analizowano matrycowe wzorce materiałów biologicznych, w tym liście tytoniu oraz rajgrasu. Uzyskane wyniki wskazują na dużą zgodność z certyfikowanymi wartościami. Kombinacja mikrofalowego rozkładu i oznaczeń wielopierwiastkowych przy użyciu spektrometru ICP-MS stanowi niezwykle przydatne narzędzie do oznaczania śladowych stężeń metali w próbkach biologicznych i środowiskowych.
The combination of coupled plasma spectrometry with microwave digestion procedures were tested on biological and environmental samples. Evaluation of modern analytical methods to determination of trace elements and digestion methods were presented. Characteristics of their types of analytical equipment were experimentally compared including combination of the emission of (ICP-OES) inductively coupled plasma with pneumatic nebulization - ICP-OES PN, emission of (ICP-OES) inductively coupled plasma with ultrasonic nebulization - ICP-OES USN and high resolution of inductively coupled plasma mass spectrometry (ICP-MS). Experimentally determined limits of detection for these combinations were presented. Limits detection in the low µg·kg⁻¹-ng·kg⁻¹ range were obtained for most elements investigated by using ICP-MS and partially ICP-OES USN combination. Inductively coupled plasma mass spectrometer ICP-MS was tested for the analysis of two biological reference materials (tobacco leaves, ryegrass). Obtained result indicates good agreement with certified analytical reports. Combination of the ICP-MS method with microwave-assisted digestion can be recommended as an useful and accurate method to multielement determination of metals in biological and environmental samples.

Źródło:

Zeszyty Problemowe Postępów Nauk Rolniczych; 2000, 471, 1
0084-5477

Pojawia się w:

Zeszyty Problemowe Postępów Nauk Rolniczych

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

Determination of ⁴⁰K Concentration in Gravel Samples from Konyaalt i Beach, Antalya

Autorzy:

Seçkiner, S.
Akkurt, İ.
Günoğlu, K.

Powiązania:

https://bibliotekanauki.pl/articles/1031203.pdf

Data publikacji:

2017-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

23.90.+W
78.66.SQ

Opis:

Terrestrial radioactivity is caused by the radioactive elements, located in various amounts in soil and rocks. The concentration of radioactive elements varies with the geographical and geological structure of the region and with the mineralogical composition of soil and rock. In this study, ⁴⁰K activity concentrations in gravel samples, collected from Konyaaltı Beach, were measured. The measurement was performed using gamma ray spectrometery at gamma spectrometry laboratory of Süleyman Demirel University.

Źródło:

Acta Physica Polonica A; 2017, 132, 3; 1095-1097
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

Assessment of quality of water samples collected from different areas of Kolkata district of West Bengal, India

Autorzy:

Pal, Partha

Powiązania:

https://bibliotekanauki.pl/articles/1191493.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Potable water
Bacteriological
Kolkata
Pathogen

Opis:

As a result of rapid urbanization and huge increase in population in city like Kolkata in West Bengal, India, limits the adequate supply of pure and safe potable water to the city-dwellers. Overcrowding in a congested city like Kolkata possesses threats for contamination of potable water supply which may deteriorate the physical, chemical as well as the bacteriological quality. The sanitary effluents when contaminate the drinking water supply sources which may cause potential health hazards to a huge number of residents and can even lead to spread of infective pathogenic bacterial strains within the population. Keeping this view the present study aims in the survey of potable water samples collected from different sources in and around the Kolkata district. Direct contact and intake of those water samples are very common phenomenon for the people residing in a congested city like Kolkata. A number of water samples from different areas consisting of varying population densities and also having numerous sources are collected and analyzed using commercially available kits. The study mainly based on observing the physical parameters as well as the chemical and bacteriological quantity and quality of the source sample of drinking water mainly from domestic sources as well as the water collected from open water bodies and the municipality supplies including tap water and deep tube wells. The presence of pathogenic bacterial strains along with the coliform contamination of the sample water tested signified a threat to the suitable drinking water in certain selected areas of this crowded city like Kolkata. If the contaminated water sources are not purified the surviving outrageous intensity of fecal E. coli, Vibrio cholera, Salmonella species and other pathogens will pose unfavorable difficulty by upgrading recurrence of water borne infection. The present survey will throw light on the current situation of the quality of potable water in certain areas of Kolkata so that necessary action should be undertaken in those areas to cope up with the situation for the benefit of the people residing there and to provide safe and pure drinking water following WHO guidelines.

Źródło:

World Scientific News; 2016, 40; 248-263
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

Quality of Samples in Adhesive Joint Testing

Autorzy:

Kuczmaszewski, Józef
Zawada-Michałowska, Magdalena

Powiązania:

https://bibliotekanauki.pl/articles/102118.pdf

Data publikacji:

2020

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

adhesive joints
quality
aviation
sample preparation
połączenia klejone
jakość
lotnictwo
przygotowanie próbki

Opis:

The study attempts to assess the quality of various types of samples used in the adhesive joint testing. One great weakness of the scientific research conducted on this type of joints is that the published papers generally do not include an analysis of the samples quality. Although the standards define the tolerances of individual dimensions, detailed reports are in fact rarely presented. Above all, it is very important to control the thickness of the adhesive, which significantly affects the strength of adhesive bonds. It was found that obtaining high quality samples depends mainly on observing the technological discipline and using appropriate instrumentation. The paper presents the standards that should be a reliable model for the scientific research on adhesive joints.

Źródło:

Advances in Science and Technology. Research Journal; 2020, 14, 3; 182-191
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

Implementation of NSOM to Biological Samples

Autorzy:

Prauzner-Bechcicki, S.
Wiltowska-Zuber, J.
Budkowski, A.
Lekka, M.
Rysz, J.

Powiązania:

https://bibliotekanauki.pl/articles/1490227.pdf

Data publikacji:

2012-02

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

87.64.M-
87.64.mt

Opis:

Near-field scanning optical microscopy is a technique providing images of structures with spatial resolution better than λ/2, which is undetectable in far-field where the Abbe law of limiting resolution is critical. In parallel to the optical imaging, topography maps are also acquired. Near-field scanning optical microscopy measurements can be performed both in air and liquid environments. The later makes the technique very useful for biomaterials analysis offering information that could not be obtained with other methods. Our work presents the results of recent studies on application of near-field scanning optical microscopy to imaging of cells in air as well as in physiological buffers. Differences in cell's topography and morphology have been noticed between two cell lines from human bladder non-malignant (HCV29) and malignant (T24) cancers. Presented results are part of the research that characterizes physiological changes of cells depending on stage of cancer.

Źródło:

Acta Physica Polonica A; 2012, 121, 2; 533-538
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

Manufacturing of composites samples with graphene
Wytwarzanie kompozytowych próbek z grafenem

Autorzy:

Wiśniewski, A.
Sałacińska, A.
Szymański, R.
Kunikowska, A.

Powiązania:

https://bibliotekanauki.pl/articles/213647.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

composite
graphene
composites with graphene

Opis:

The article presents the state of knowledge within the scope of graphene production used in polymer matrices composites, as well as methods of obtaining graphene for these composites, including chemical method. The way of obtaining graphene in form of planes with dimensions of90 x 100 mm and the method of manufacturing multilayer composite with graphene were presented. Composites were produced from carbon fiber-epoxy resin prepregs in out of autoclave process. The adhesive film were used as an additional component which allows to transfer of graphene plane on carbon-epoxy resin prepregs and facilitate the consolidation process. In terms of the quality analysis of prepared composite samples results of ultrasonic tests of composites plate without the graphene and with graphene as an A-scan, B-scan, C-scan, S-scan were shown. The use of ultrasonic methods of registration: C-scan type amplitude of the echo and bottom echo signal amplitude, that allows to detect manufacturing defects caused by the mismatch of parallel edges of carbon prepregs, were engaged. The analysis of C-scan images allows to determine the accuracy of the angular orientation of the carbon layers.
W artykule przedstawiono stan wiedzy w zakresie wytwarzania grafenu do zastosowań w kompozytach o osnowach polimerowych, a także metody pozyskiwania grafenu dla tych kompozytów, w tym metodę chemiczną. Przedstawiono sposób pozyskiwania grafenu w formie płaszczyzn o wymiarach 90x100 mm, a także metodę wytwarzania wielowarstwowego kompozytu z grafenem. Kompozyty wytwarzano z preimpregantów węglowo-epoksydowych w procesie bezautoklawowym. Zastosowano klej błonkowy, jako dodatkowy składnik kompozytu pozwalający na przeniesienie płaszczyzn grafenowych na preimpregnat węglowo-epoksydowy oraz ułatwiający proces konsolidacji kompozytu. W zakresie wykonanych analiz jakości przygotowanych próbek kompozytowych przedstawiono wyniki badań ultradźwiękowych płyt kompozytowych bez grafenu i z grafenem w postaci: A-scan, B-scan, C-scan i S-scan. Przedstawiono użycie metody ultradźwiękowej z rejestracją typu C-scan amplitudy echa oraz amplitudy echa dna, która pozwala na wykrycie wad produkcyjnych powstałych w wyniku niedopasowania równoległego krawędzi preimpregnatu węglowego. Z analizy obrazów typu C-scan określono dokładność kątową ułożenia warstw węglowych.

Źródło:

Prace Instytutu Lotnictwa; 2016, 4 (245); 262-270
0509-6669
2300-5408

Pojawia się w:

Prace Instytutu Lotnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Optoacoustic Measurements for Small-Volume Liquid Samples

Autorzy:

Egerev, S.

Powiązania:

https://bibliotekanauki.pl/articles/1377936.pdf

Data publikacji:

2015-01

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

43.35.Bf
43.35.Sx
05.70.-a
42.40.My
42.55.-f

Opis:

High sensitivity of optoacoustic measurement method makes it possible to use it for the analysis of the liquid samples having microliter volume. The core of any measurement optoacoustic system is represented by a so-called optoacoustic cell. The paper deals with a layered prism optoacoustic cell. It is well-suited for the small-volume sample analysis. In the paper, laser-induced elastic pulse in the layered prism cell is examined at the stage of its generation, at the stage of its propagation through the body of the cell, and at the stage of the wideband pick-up with the piezoelectric transducer. This pulse serves to determine trace concentrations of various impurities in the sample. The optimization of layered prism cell parameters is proposed. Figures of merit of optoacoustic determination of lipopolysaccharides in the liquid small-volume sample with the use of the optimized layered prism cell are evaluated as an example.

Źródło:

Acta Physica Polonica A; 2015, 127, 1; 10-14
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Investigation of Modal Behaviour of Resonance Spruce Wood Samples (Picea abies L.)

Autorzy:

Mania, P.
Fabisiak, E.
Skrodzka, E.

Powiązania:

https://bibliotekanauki.pl/articles/177109.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

resonance wood
spruce wood
modal analysis

Opis:

Results of experimental modal analysis of a resonance and non-resonance spruce wood (Picea abies L.) are presented. The resonance wood came from a tree from Poland and Bosnia and Herzegovina, while the non-resonance wood came from the vicinity of Olsztyn from the north-eastern Poland. The modal parameters (modal frequency, modal damping and mode shapes) of the wood samples were determined for the samples of 8 mm in thickness. Modal analysis was made by pulse excitation. The resonance and non-resonance wood differ in the fundamental modal parameters as well as in the number of potential modes. Additionally, calculated values of damping factor are presented. The values are much bigger for a non-resonance wood than for good quality resonance spruce.

Źródło:

Archives of Acoustics; 2017, 42, 1; 23-28
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Porównanie wyników szacowania niepewności pomiaru na podstawie próbek dublowanych w monitoringu jakości wód podziemnych, według różnych schematów badań
Comparison of measurement uncertainty estimation results based on duplicate samples of groundwater quality monitoring according to different experimental designs

Autorzy:

Kostka, A.

Powiązania:

https://bibliotekanauki.pl/articles/2075412.pdf

Data publikacji:

2015

Wydawca:

Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy

Tematy:

niepewność pomiaru
próbki duplikowane
zrównoważone badania
niezrównoważone badania
projekt RANOVA
measurement uncertainty
duplicate samples
balanced and unbalanced design
RANOVA

Opis:

In accordance with EU and Polish legal regulations the obtained results of chemical analysis of groundwater monitoring should include the information about the measurement uncertainty. Sampling process, transportation and analysis procedure – all impact the final outcome of measurement. In this paper, on the basis of duplicated samples taken during groundwater monitoring, various calculations of measurement uncertainty were compared via simplified balanced, full balanced and unbalanced experimental designs. The aforementioned estimations differ in terms of number of chemical analysis, which is reflected in the cost of monitoring. The details of results and the possibility of assessing particular components influencing the value of uncertainty derives from the number of undertaken analysis. Calcium, magnesium, bicarbonate and aluminum were investigated. The calculations were made using RANOVA program, applying robust statistics method. Conclusively, the simplified balanced design fulfills the necessary legal requirements at the lowest possible costs. The major drawback associated with this method is the total measurement uncertainty due to the lack of values of components. The full balanced experimental design provides sufficient information on certain components of measurement uncertainty. However, significant financial input is necessary. The unbalanced experimental design, which allows to estimate the contribution of particular components in the total measurement uncertainty, is more affordable and only one extra chemical analysis (for the pair of samples) is needed.

Źródło:

Przegląd Geologiczny; 2015, 63, 10/1; 834--839
0033-2151

Pojawia się w:

Przegląd Geologiczny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Możliwości oceny zanieczyszczenia handlowego węgla kamiennego rtęcią na podstawie analiz próbek pokładowych
Possibilities of assessment of commercial hard coal contamination with mercury on the basis of analyses of seam coal samples

Autorzy:

Pyka, I.
Wierzchowski, K.

Powiązania:

https://bibliotekanauki.pl/articles/167296.pdf

Data publikacji:

2015

Wydawca:

Stowarzyszenie Inżynierów i Techników Górnictwa

Tematy:

węgiel kamienny do celów energetycznych
próbki pokładowe
zawartość rtęci
prognozy emisji rtęci
steam hard coal
seam samples
mercury content
mercury emissions prognosis

Opis:

W artykule omówiono badania zawartości rtęci w próbkach pokładowych bruzdowych dokumentacyjnych oraz dwóch grupach produktów handlowych: sortymentach średnich i grubych łącznie (węgiel wzbogacony) oraz w sortymentach innych (węgiel głównie surowy – niewzbogacony). Przeprowadzono poróżniania w celu oceny czy wyniki oznaczeń zawartości rtęci w próbkach pokładowych bruzdowych dokumentacyjnych mogą być wykorzystane do prognozowania wyników zawartości rtęci w węglach handlowych, czyli do oceny zagrożeń środowiskowych (emisje) zużytkowania węgla, jako alternatywy dla bezpośrednich pomiarów emisji rtęci u użytkowników węgla. Możliwości te są ograniczone, a różnice między zawartością rtęci w próbkach bruzdowych dokumentacyjnych, a zawartością rtęci w produktach są nieco inne niż opisane w literaturze, np. dotyczące węgli amerykańskich. Badania są ograniczone do węgla kamiennego do celów energetycznych, wydobywanego w kopalniach Górnośląskiego Zagłębia Węglowego.
This paper presents the analyses of mercury content in samples taken from coal seams, so called seam channel samples, for documentary purposes in two groups of coal commercial products (sized coals): pea coals, nuts and cobbles analyzed together (constituting the cleaned coal) and all remaining sized coal products analyzed together (constituting raw coal or only partially cleaned). Comparisons were performed to assess whether the results of mercury content determinations for seam coal samples could be used for prognoses of the results of mercury content determinations for coal products and furthermore for the assessment of the environmental impacts (emission) of coal usage, as the alternative to direct mercury emissions measurements. One can conclude that such prognoses are limited and the differences between the results of determinations of mercury content in coal in seams and in products are different than those described in the literature, for example concerning US coals. The analyses are limited to the steam coal exploited in collieries located in the Upper Silesian Coal Basin.

Źródło:

Przegląd Górniczy; 2015, 71, 6; 50-56
0033-216X

Pojawia się w:

Przegląd Górniczy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

Determination of low molecular weight organic acids (LMWOAs) in environmental samples

Autorzy:

Magdziak, Z.
Drzewiecka, K.

Powiązania:

https://bibliotekanauki.pl/articles/347035.pdf

Data publikacji:

2011

Wydawca:

Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej

Tematy:

bioremediation
heavy metals
low molecular weight organic acids
LMWOAs
uptake

Opis:

This paper presents a quick method to identify and quantify ten low molecular weight organic acids in environmental samples (e.g., soil, cultivation substrate). The procedure involves extraction of the acids from the sample with a dilute acid of a pH of 2, followed by the separation and quantification of ten acids, i.e., oxalic, formic, acetic, malic, maleic, lactic, malonic, succinic, fumaric, and citric, by reversed-phase liquid chromatography (RPLC). The detection limit was in the range from 8.6 × 10-4 nM to 0.014 microM, with recovery in the range from 60 to 100%. A proven method was applied for the determination of exudate components in the king oyster mushroom (Pleurotus eryngii) post-cultivation straw substrate spiked individually with Cu2+, Co2+, Cd2+, Zn2+ and Ni2+ at 10 mM. The generation/exudation of LMWOAs was metal dependent and was strongly induced by Ni and Cd, less induced by Co and Cu, and suppressed by Zn ions. At 10 mM of Ni, the total concentration of the acids was about 6 times as high as that of the control. We can assume that particular metals alter the mycelium growth and mushroom physiology mainly through the competitive inhibition of nutrients such as Fe and Ca, and also by the inactivation of metalloenzymes, responsible for the substrate mineralization and antioxidant potential. Moreover, organic ligands do not only enhance the solubility of the trace metals, but also they reduce their toxicity to the mushroom, increasing uptake/accumulation abilities during bioremediation of soil/medium contaminated with heavy metals.

Źródło:

Ars Separatoria Acta; 2011, 8; 81-88
1731-6340

Pojawia się w:

Ars Separatoria Acta

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

Characterization of Viscoelastic Materials Using Free-Layered and Sandwiched Samples: Assessment and Recommendations

Autorzy:

Ozer, M.
Koruk, H.
Sanliturk, K.

Powiązania:

https://bibliotekanauki.pl/articles/1194059.pdf

Data publikacji:

2015-04

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

46.35.+z
46.80.+j

Opis:

Viscoelastic materials are widely used in many applications in practice. However, determination of the elastic and damping properties of these materials is quite difficult in the sense that the identified results may contain high degree of uncertainty. The characterization of viscoelastic materials using the Oberst beam method, based on non-contact excitation and response measurements, is revisited in this paper. The effects of signal processing parameters such as frequency resolution in Frequency Response Function (FRF) measurements, as well as the effects of various single-degree-of-freedom modal analysis methods, including circle-fit, half-power and line-fit are investigated first. Then, the modal loss factors, Young's modulus and shear modulus of some sample viscoelastic materials are identified using both the free-layered and sandwiched samples. The results obtained from different tests are compared, discussed and some recommendations are made so as to identify the damping and elastic properties of typical viscoelastic materials with better accuracy. Analyses of a large number of FRF measurements show that the selection of the appropriate signal processing parameters and the use of appropriate modal analysis method can be very significant during the identification of viscoelastic materials. By following the approach presented in this paper, the damping and elastic properties of viscoelastic materials can be identified with better accuracy using either free-layered or sandwiched samples. The material properties obtained by this approach can be used for developing valid structural models and/or for damping optimization purposes.

Źródło:

Acta Physica Polonica A; 2015, 127, 4; 1251-1254
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

Radon Concentration in Drinking Water Samples at Hilla city, Iraq

Autorzy:

Muttaleb Al-jnaby, Mohsin Kadhim

Powiązania:

https://bibliotekanauki.pl/articles/1189957.pdf

Data publikacji:

2016

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Babylon
water
radon
concentrations
annual effective dose
RAD7
UNSCEAR

Opis:

The radioactivity of radon gas in thirty eight samples of drinking water that manufactured in different regions of Hilla, the center of Babylon (Iraq) have been measured by RAD7 detector. The high and low average radon concentration, average standard deviation and the annual dose have been calculated, where the result were A16 (0.193 ±0.0211) Bq•L-1, A1 (0.0361 ±0.00014) Bq•L-1, the average of radon concentration (0.115 ±0.048) Bq•L-1 and the annual effective dose was 0.413 mSv•y-1

Źródło:

World Scientific News; 2016, 52; 130-142
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Quantifying the risk of zoonotic geohelminth infections for rural household inhabitants in Central Poland

Autorzy:

Gawor, Jakub
Borecka, Anna

Powiązania:

https://bibliotekanauki.pl/articles/989954.pdf

Data publikacji:

2017

Wydawca:

Instytut Medycyny Wsi

Tematy:

geohelminth eggs
soil samples
contamination
rural environment

Opis:

The objective of this study was to evaluate the risk of soil transmitted zoonotic helminth infections for families with young children, inhabitants of villages in the Mazowieckie Province of Central Poland. Epidemiological survey was conducted at 33 randomly selected households with 2–3 children present. Examination of soil samples from yards surrounding the houses for the presence of geohelminth eggs was conducted, the households were inspected, and family members interviewed using a designed questionnaire. Among 55 localities examined, i.e. 33 backyards, 10 vegetable gardens and 12 sandpits, contamination was found in 2 backyards (6.1%) and 1 sandpit (8.3%) at 3 households (9.1%). Of the total 550 examined soil samples, 4 (0.7%) were found to contain Trichuris and Toxocara eggs, with an average density of 1.5 and 2.0 eggs per sample. The study showed a low level of soil contamination, which was the result of inhabitants care about the sanitation of their domiciles. However, the results of the questionnaire survey demonstrated the need to warn rural residents about the risk factors for zoonotic helmints infections. In particular, parents should be advised how to minimize the threat of parasitic diseases for children in the rural environment. The presented study showed that promotional campaigns implemented in recent years on the prevention of parasitic zoonoses have had little effect to increase the awareness of the rural community. The present results confirmed that Toxocara is the most common zoonotic agent among geohelminths in the rural environment.

Źródło:

Annals of Agricultural and Environmental Medicine; 2017, 24, 1
1232-1966

Pojawia się w:

Annals of Agricultural and Environmental Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

Evaluation of the Content of Selected Heavy Metals in Samples of Polish Honeys

Autorzy:

Sitarz-Palczak, E.
Kalembkiewicz, J.
Galas, D.

Powiązania:

https://bibliotekanauki.pl/articles/123800.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

bee products
heavy metals
FAAS

Opis:

This paper presents the result of the determination of the total content of Cu, Pb and Zn by the method of atomic absorption spectrometry with atomization in an air-acetylene flame in Polish honeys samples. The research material was a honeydew, monofloral honey and buckwheat honey. For the mineralization of samples, the following solutions were applied: 1) HNO_3(conc), 2) HNO_3(conc) and H₂O_2(conc) in the volume ratio equal to 4:1 and 3:1. On the basis of the results and recommended food standards the percentage of the recommended dietary allowances (RDA) in connection with the consumption of 100 g of product were estimated. To verify the results validation of analytical method used was carried out. It was included defining the following validation parameters values: the limit of detection and quantification; linearity and measurement range; repeatability and accuracy of the results. The contamination of the analyzed honeys by Pb is higher than the acceptable level of contamination of this element. The highest contents of Cu and Zn were characterized by monofloral honeys.

Źródło:

Journal of Ecological Engineering; 2015, 16, 3; 130-138
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

The Structure of Goal Contents Revisited. A Verification of the Model in Polish Samples

Autorzy:

Górnik-Durose, Małgorzata
Jach, Łukasz

Powiązania:

https://bibliotekanauki.pl/articles/2128336.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

goals
Self-Determination Theory
Aspiration Index

Opis:

The article presents an attempt to confirm the circumplex structure of goal contents, identified in 15 cultures around the world (Grouzet et al., 2005), in nine Polish samples. The procedure followed steps from the original study and included testing the assumed 11-factor goal structure and the two-dimensional circular organization of the goal contents. None of the analyses showed outcomes that would explicitly confirm the results attained in the original study. The CFA showed rather poor fits. Results of the MDS generally supported the assumption about the two-dimensional goal contents structure, however ipsative distance analysis reproduced only one of the two assumed dimensions. Finally, although the CIRCUM analysis showed in principle that in the Polish sample the organization of goal contents on the circumference was quite similar to original, the RMSEA indicated poor fit. Methodological and conceptual reasons for the replication failure are analyzed and discussed.

Źródło:

Polish Psychological Bulletin; 2016, 4; 451-463
0079-2993

Pojawia się w:

Polish Psychological Bulletin

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

Radioactivity investigation of sediment samples from Beni Haroun Dam using high-resolution gamma-ray spectroscopy

Autorzy:

Bouhila, G.
Benrachi, F.

Powiązania:

https://bibliotekanauki.pl/articles/1050951.pdf

Data publikacji:

2017-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

29.90.+r
29.30.-h

Opis:

In this study, the levels of natural and anthropogenic radioactivity in the sediment samples, collected from Beni Haroun Dam, were investigated using gamma-ray spectrometry. The results obtained for the ²³⁸U, ²³²Th series, ⁴⁰K natural element and ¹³⁷Cs anthropogenic radionuclide are discussed. To evaluate the radiological hazard of radioactivity in samples, the absorbed dose rate, the annual effective dose, the radium equivalent activity Ra_{eq}, the external and internal hazard indices H_{ex} and H_{in} were calculated and presented in comparison with the data collected from different areas in the world.

Źródło:

Acta Physica Polonica A; 2017, 132, 3; 889-891
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 87.

Tytuł:

Temperature Measurement by Statistical Parameters of Ultrasound Signal Backscattered from Tissue Samples

Autorzy:

Gambin, B.
Kruglenko, E.

Powiązania:

https://bibliotekanauki.pl/articles/1402186.pdf

Data publikacji:

2015-07

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

87.50.wp
43.35.+d
87.57.-s

Opis:

A novel estimation of temperature changes inside soft tissues has been proposed in sub-ablation range, i.e. ≈ 20°C-48°C. This estimation has been obtained by studying statistical properties of backscattered ultrasonic signals. Two different procedures of heating/cooling have been performed in which the RF echoes have been registered from soft tissue phantom in the first procedure, and from soft tissue in vitro in the second one. Calculated envelopes of signals registered in time points during heating/cooling experiments have been treated as a statistical sample drawn from a random variable with three different distributions, namely the Rayleigh distribution, the Nakagami distribution, and the K-distribution. The histograms obtained in subsequent time moments have been fitted to the three distributions. Dependencies of their shape and scale parameters on temperature have been calculated. It is concluded that the shape parameter of the K-distribution can be chosen as the best marker of temperature changes in both experiments. The choice of the marker has been made by analysis of temperature dependencies of all calculated parameters and by comparing the quality of fitting all histograms to the considered distributions. Besides, the chosen marker as a function of temperature exhibits the closest shape to temperature/time function experimentally measured.

Źródło:

Acta Physica Polonica A; 2015, 128, 1A; A-72-A-78
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 88.

Tytuł:

DNA isolation from Cryptosporidium oocysts directly from stool samples for diagnostic goals using PCR

Autorzy:

Sulima, P.

Powiązania:

https://bibliotekanauki.pl/articles/840154.pdf

Data publikacji:

1998

Wydawca:

Polskie Towarzystwo Parazytologiczne

Tematy:

diagnostic goal
stool
polymerase chain reaction
Cryptosporidium
DNA
oocyst

Źródło:

Annals of Parasitology; 1998, 44, 3
0043-5163

Pojawia się w:

Annals of Parasitology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 89.

Tytuł:

Infrared spectral analysis of waste pet samples

Autorzy:

Vijayakumar, S.
Rajakumar, P. R.

Powiązania:

https://bibliotekanauki.pl/articles/411833.pdf

Data publikacji:

2012

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

butelki PET
ABS
FTIR
mieszanki kompozytowe
PET bottles
FT-IR spectra
blended composites

Opis:

There are fifteen waste pet bottles and a commercial grade ABS was collected from local supplier of Chidambaram town. The ABS was used to study the mechanical properties of PET blend composites. This study was performed by FT-IR spectroscopy. From the characteristics infra-red stretching bands the mechanical properties of samples were discussed.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2012, 4; 58-65
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 90.

Tytuł:

An Automatic Synthesis of Musical Phrases from Multi-Pitch Samples

Autorzy:

Pluta, M.
Spalek, L. J.
Delekta, R. J.

Powiązania:

https://bibliotekanauki.pl/articles/177577.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

sound synthesis
synthesis methods
sampling
Concatenative Sound Synthesis

Opis:

Sound synthesizers are a natural element of a musician’s toolset. In music arrangement, samplers can often produce satisfactory results, but it requires a combination of manual and automatic methods that may be arduous at times. Concatenative Sound Synthesis reproduces many of natural performance- and expression-related nuances but at a cost of high demand for processing power. Here, another method of musical phrase synthesis aimed at music arrangement is presented that addresses these and other related issues. Contrary to common practice, we propose to record and utilize sound samples containing not one, but short sequences of pitches. In effect, natural pitch transitions are preserved and phrases appear to be much smoother, despite using very limited set of performance rules. The proof-of-concept implementation of the proposed method is discussed in detail along with attempts at optimizing the final sound effects, based on auditory tests. The limitations and future applications of the synthesizer are also discussed.

Źródło:

Archives of Acoustics; 2017, 42, 2; 235-247
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 91.

Tytuł:

Method of asbestos separation in soil samples and determination by optical microscope

Autorzy:

Lipiecka, S.
Domaszewicz, A.
Szeflińska, K.
Urbaniak, W.

Powiązania:

https://bibliotekanauki.pl/articles/347011.pdf

Data publikacji:

2010

Wydawca:

Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej

Tematy:

asbestos determination
airborne fibers
microscopic analysis

Opis:

A new method of asbestos determination for quantitative analysis in environmental samples, e.g., soil and water has been developed. The proposed procedure is inexpensive and relatively fast and easy. It can be used e.g. for quantitative determination of asbestos in the soil after the removal of asbestos containing materials for confirmation of the efficiency of work executed. A Polish Patent Application for the procedure of asbestos determination and an analytical set for asbestos determination have been prepared. The analytical set for asbestos determination is based on optical microscopy with optional phase contrast, and is equipped with a digital camera connected to a computer with the appropriate software. The procedure of determination involves leaching the asbestos fibers from the soil and subsequently investigation of leachate by optical microscope. A surface active agent is used for a better leaching of the asbestos fibers. It has been shown, that application of the surface active agent for analysis improves the accuracy of determination. We would like to briefly present the proposed procedure of asbestos determination and the results of studies on the optimization of this procedure, especially in soils.

Źródło:

Ars Separatoria Acta; 2009-2010, 7; 85-98
1731-6340

Pojawia się w:

Ars Separatoria Acta

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 92.

Tytuł:

Remarks on Classical Means for One and Many Samples
Uwagi o średnich klasycznych dla jednej i wielu prób

Autorzy:

Wagner, Wiesław

Powiązania:

https://bibliotekanauki.pl/articles/905041.pdf

Data publikacji:

2009

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

descriptive statistics
classical means
optimization criteria

Opis:

In the paper there were given basic designations for one and many samples in reference to classical means. In the next there were introduced the optimization criteria defining classical means for one sample, also for the distributive series of size, and for many samples and gives several examples, after which comes recapitulation of the paper.
W statystyce opisowej do podstawowych czynności opracowywania danych liczbowych z próby zalicza się wyznaczanie charakterystyk liczbowych. Wyróżnia się dwie ich grupy: klasyczne i pozycyjne. W pierwszej, najczęściej stosuje się charakterystyki położenia, a wśród nich średnie klasyczne. Pełnią one ważną rolę w interpretacji danych, a także są często wykorzystywane do wyznaczania innych charakterystyk liczbowych. Zasadniczo wyróżnia się trzy średnie: arytmetyczną, harmoniczną i geometryczną. Każda z nich jest wyznaczana na innych zasadach, a mianowicie na przekształceniach liniowych, odwrotnościowych i potęgowych. Powstaje pytanie, czy można dla nich znaleźć wspólną regułę wyprowadzenia, a wraz z tym traktować je jako szczególne przypadki szerszej klasy średnich zarówno w przypadku jednej próby, jak i wielu prób. W pracy została taka reguła wyprowadzona.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 2009, 225
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

Ilorazowe testy sekwencyjne dla frakcji dla prób nieprostych
Sequential Probability Ratio Tests of Fraction for Nonsimple Samples

Autorzy:

Pekasiewicz, Dorota

Powiązania:

https://bibliotekanauki.pl/articles/906579.pdf

Data publikacji:

2002

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Tematy:

ilorazowy test sekwencyjny
statystyka testu
schemat losowania

Opis:

Sequential probability ratio tests may be used to verify statistical hypotheses not only when sample is drawn sequentially independently but also when the sampling is performed according to other patterns. In the paper a sequential probability ratio test for fraction is considered. The following sampling patterns are considered: individual dependent and layer sampling and aggregate two stage sampling. For these sampling patterns the samples were determined in the form of the statistics of the sequential test for fraction.
Ilorazowe testy sekwencyjne mogą służyć do weryfikacji hipotez statystycznych nie tylko wtedy, gdy elementy do próby losowane są sekwencyjnie w sposób niezależny, ale również w przypadku, gdy próba pobierana jest według innych schematów losowania. W pracy rozważany jest ilorazowy test sekwencyjny dla frakcji. Rozpatrywane są następujące schematy losowania próby: indywidualne losowanie zależne i warstwowe oraz losowanie zespołowe dwustopniowe. Dla wymienionych schematów losowania próby wyznaczone zostały postaci statystyk testu sekwencyjnego dla frakcji.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 2002, 162
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

Identifying microbes from environmental water samples

Autorzy:

Mungs, Wenfa

Powiązania:

https://bibliotekanauki.pl/articles/1153739.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

biomarker
educational research
inquiry-based
mass spectrum fingerprinting
microbial ecology
microbial typing
phylogeny
ribosomal proteins
scientific method
taxonomy

Opis:

What is the microbe that we are dealing with? Whether it is cholera or anthrax, we want to know the disease-causing microorganism as quickly as possible since prompt identification of the causative organism would help control disease spread - and potentially save lives through provision of appropriate care and medication. Yet, despite the advent of rapid microbial identification tools – particularly those based on mass spectrometry – most undergraduate curricula continue to focus on culture- and nucleic acid-based identification techniques since they are widely used for detecting and identifying microbes in clinical and environmental samples. Mass spectrometry-based methods, however, have increasingly complemented traditional approaches in clinical and research laboratories - but are rarely featured in undergraduate curricula. Motivated by the desire to address the curriculum gap, the author of this study developed an inquiry-based laboratory exercise for introducing students to the operating principles and methodology of mass spectrometry-based microbial identification. By requiring students to identify microbes in environmental water samples – a real-life problem with unknown answers – the exercise piqued the students’ interest in learning, while helping to stir their curiosity through an interesting field activity in which they could put on a scientist’s hat in solving a mystery. This synopsis article summarizes a piece of published educational research and expands on the discussion of concepts underlying matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS)-based microbial identification. Herein, the article discusses the relative advantages and disadvantages of the pattern recognition and proteome database search approaches for analyzing mass spectra data. Additionally, the effect of general and tailored sample preparation protocols on identification accuracy is also elaborated. Finally, the pedagogical utility of field- and inquiry-based educational tools is also discussed in greater detail from a post-publication perspective. A full-length synopsis of the work and a structured abstract can be found in the accompanying PDF file, the original article being entitled: “Teaching Microbial Identification with Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS) and Bioinformatics Tools”.

Źródło:

World News of Natural Sciences; 2015, 2; 7-19
2543-5426

Pojawia się w:

World News of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 95.

Tytuł:

Quantitative microbial risk assessment of Cryptosporidium in bivalve samples from Manila Bay, Philippines

Autorzy:

Bolo, N.R.
Pagoso, E.J.A.
Widmer, K.W.
Rivera, W.L.

Powiązania:

https://bibliotekanauki.pl/articles/6612.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Parazytologiczne

Źródło:

Annals of Parasitology; 2019, 65, 4
0043-5163

Pojawia się w:

Annals of Parasitology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

Scalar damage variable determined in the uniaxial and triaxial compression conditions of sandstone samples

Autorzy:

Cieślik, J.

Powiązania:

https://bibliotekanauki.pl/articles/178345.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

trójosiowe ściskanie
jednoosiowe ściskanie
uszkodzenia
triaxial compression
uniaxial compression
damage

Opis:

The article is based on the results of uniaxial and triaxial compression tests, performed on Wustenzeller sandstone. An overview of the possible definitions of damage variable describing the process of damage development on the basis of various hypotheses has been presented in the first part of the article. In the main part of the article the author has presented the results of laboratory investigations, where the state of damage and its changes in rock samples under uniaxial and triaxial compression conditions were being observed. Using a modified procedure of triaxial tests, a definition of damage variable, determined on the basis of changes of volumetric stiffness of an examined rock, has been developed. Damage variable defined this way, in relation to a variable determined on the basis of axial stiffness changes, points to some anisotropy effects of damage phenomenon. The results obtained from both methods have been compared whereas the relations determining the evolution of damage variable in the loading process have been established.

Źródło:

Studia Geotechnica et Mechanica; 2013, 35, 1; 73-84
0137-6365
2083-831X

Pojawia się w:

Studia Geotechnica et Mechanica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

Aproksymacja wartości krytycznych testu Manna-Whitneya dla małych prób
Approximation of Critical Values of Mann-Whitney Test for Small Samples

Autorzy:

Guraj-Kaczmarek, Kazimiera
Tomaszewicz, Andrzej S

Powiązania:

https://bibliotekanauki.pl/articles/904637.pdf

Data publikacji:

1992

Wydawca:

Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego

Opis:

The article deals with important, from the point of view of application, Mann-Whitney test used for comparing distribution of two populations. After a short review of the known from literature basic properties of the test’s statistic, a definition of randomized test and interpolated quantiles is given. Then a simple and at the same time quite exact (for a sample of the size 5 ≤ n ≤ 50) approximation of these quant i les is presented, due to which the using of tables becomes needless. Moreover, it has been proved that the recommended in many works approximation by means of normal distribution leads to large errors in the sample size.

Źródło:

Acta Universitatis Lodziensis. Folia Oeconomica; 1992, 117
0208-6018
2353-7663

Pojawia się w:

Acta Universitatis Lodziensis. Folia Oeconomica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

Assessment of the size of VaR backtests for small samples

Autorzy:

Kaszyński, Daniel
Kamiński, Bogumił
Pankratz, Bartosz

Powiązania:

https://bibliotekanauki.pl/articles/1043916.pdf

Data publikacji:

2020-12-30

Wydawca:

Główny Urząd Statystyczny

Tematy:

Value at Risk
market risk management
backtesting
empirical size assessment

Opis:

The market risk management process includes the quantification of the risk connected with defined portfolios of assets and the diagnostics of the risk model. Value at Risk (VaR) is one of the most common market risk measures. Since the distributions of the daily P&L of financial instruments are unobservable, literature presents a broad range of backtests for VaR diagnostics. In this paper, we propose a new methodological approach to the assessment of the size of VaR backtests, and use it to evaluate the size of the most distinctive and popular backtests. The focus of the paper is directed towards the evaluation of the size of the backtests for small-sample cases - a typical situation faced during VaR backtesting in banking practice. The results indicate significant differences between tests in terms of the p-value distribution. In particular, frequency-based tests exhibit significantly greater discretisation effects than duration-based tests. This difference is especially apparent in the case of small samples. Our findings prove that from among the considered tests, the Kupiec TUFF and the Haas Discrete Weibull have the best properties. On the other hand, backtests which are very popular in banking practice, that is the Kupiec POF and Christoffersen's Conditional Coverage, show significant discretisation, hence deviations from the theoretical size.

Źródło:

Przegląd Statystyczny; 2020, 67, 2; 114-151
0033-2372

Pojawia się w:

Przegląd Statystyczny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Testing the construct validity of the Discounting Inventory – Psychometric properties of a Polish and German samples

Autorzy:

Malesza, Marta

Powiązania:

https://bibliotekanauki.pl/articles/2128671.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

Discounting Inventory
construct validity
behavioral impulsivity
university students

Opis:

The Discounting Inventory (DI), originally developed in polish language, allows the measurement of individual differences in the delay, probabilistic, effort, and social discounting rates. The present study attempted to validate the DI’s psychometric properties using German university students and to compare the results to those from a sample of Polish university students. Over four hundred participants completed the DI and traditional discounting measures. A confirmatory factor analyses indicated that the original four-factor model of the DI provided an excellent fit for the German data and internal consistency was high. These outcomes were similar, if not superior, to those from the Polish sample. DI scores strongly correlated with traditional discounting measures scores in both samples, replicating previous results. These findings indicate that the DI is a valid measure for use in a sample from another cultural setting, which is potentially useful to both researchers and practitioners.

Źródło:

Polish Psychological Bulletin; 2017, 1; 118-128
0079-2993

Pojawia się w:

Polish Psychological Bulletin

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 100.

Tytuł:

Jak w Polsce rozwija się zjawisko niedostępności respondentów? Analiza na przykładzie badań CBOS 1993–2011
How is the nonresponse phenomenon developing in Poland? A trend analysis of nonresponse in Poland in 1993–2011 based on CBOS research

Autorzy:

Grzeszkiewicz-Radulska, Katarzyna

Powiązania:

https://bibliotekanauki.pl/articles/413183.pdf

Data publikacji:

2012

Wydawca:

Łódzkie Towarzystwo Naukowe

Tematy:

niedostępność respondentów współczynnik kontaktów
współczynnik kooperacji
próba imienna
próba gospodarstw domowych
PAPI
CAPI
nonresponse
contact rate
cooperation rate
individual samples
household samples

Opis:

Celem artykułu jest przedstawienie i objaśnienie trendów niedostępności respondentów w oparciu o dane z lat 1993–2011 dla sondażu „Aktualne problemy i wydarzenia”, realizowanego techniką wywiadu osobistego przez Centrum Badania Opinii Społecznej. W pracy autorka posługuje się miarami poziomu realizacji przyjętymi przez AAPOR. Wyniki wskazują, że na przestrzeni badanego okresu odsetek odpowiedzi (RR2) spadł o około 40 punktów procentowych, głównie za sprawą wzrostu nieobecności oraz odmów. W analizach wielozmiennowych ustalono, że na kształt krzywej kontaktów (CON1) niekorzystnie wpłynęła przede wszystkim zmiana sposobu doboru próby (przejście z prób gospodarstw domowych na próby imienne) oraz większe obciążenie ankietera pracą. Zmiana sposobu doboru respondentów miała jednak korzystny wpływ na poziom kooperacji (COOP4). Czynniki niesprzyjające partycypacji w sondażach to większe obciążenie ankietera pracą, a także negatywne nastroje społeczne i poprawa sytuacji ekonomicznej w kraju.
1993 to 2011 based on the personal interview survey (CAPI) “Current Problems and Events” conducted in Poland by the Public Opinion Research Center (CBOS). The author shows that since 1993 response rate (RR2) has remarkably decreased (by 40 percentage points) due to nonconatcts and refusals. The findings of multivariate analysis demonstrate that the lower contact rate (CON1) can be explained by changes in sample design (i.e. using individual samples rather than household samples) and interviewer workload. The transition of sampling choices however, positively influenced the level of respondents’ cooperation (COOP4). The adverse factors affecting respondents’ participation are: heavier interviewer workload, a negative social mood and an improvement in the economic situation.

Źródło:

Przegląd Socjologiczny; 2012, 61, 1; 83-111
0033-2356

Pojawia się w:

Przegląd Socjologiczny

Dostawca treści:

Biblioteka Nauki

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