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    Wyświetlanie 1-17 z 17
    Tytuł:
    Variation of CFCs and $SF_6$ Concentration in Air of Urban Area, Kraków (Poland)
    Autorzy:
    Bielewski, J.
    Śliwka, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1360579.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.60.-k
    Opis:
    Chlorofluorocarbons, both of natural and industrial origin, currently exist as trace gases in the entire human environment. The CFCs cause ozone depletion in the stratosphere. Moreover, CFCs and $SF_6$ take part in intensification of the greenhouse effect. On account of international agreements, the measurements of CFCs and $SF_6$ in air were started. Measurement stations of these gases were situated at places outside of urban areas influence and gathered on the world-wide program - AGAGE (Advanced Global Atmospheric Gases Experiment). One of these stations is Mace Head (Ireland, 53° N, 10° W), which participates in AGAGE since 1987 and in InGOS (Integrated non-$CO_2$ Greenhouse Gas Observing System) program since 2011. Similar research is also conducted in Central Europe, in urban area of Kraków (Poland, 50° N, 19° E) since 1997. This work discusses the results of concentration measurements (1997-2012) of selected halocarbons and $SF_6$ in Kraków. To obtain concentrations of the measured compounds the mathematical procedure has been used, where concentrations were calculated using a five points Lagrange interpolation method. Daily arithmetic means of the measured mixing ratios and their standard deviations were determined. Based on these data, efficiency of Montreal Protocol legislation, implemented in Poland could be assessed.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 895-897
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Ethephon on the Hemolymph Metabolites of the Greater Wax Moth Galleria mellonella L. (Lepidoptera: Pyralidae)
    Autorzy:
    Altuntaş, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401965.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.60.-k
    Opis:
    Ethephon (ETF), one of the plant growth regulators, is used in agricultural systems as a valuable tool due to its property of regulating fruit maturation. Here, we aimed to investigate the toxic effects of ETF on the hemolymph metabolites of the greater wax moth, G. mellonella which is an experimental animal and a serious pest in wax. Different doses of ETF (250-390 μg/5 μl) were injected with force feeding method to the last instars and the effects of ETF on the level of hemolymph protein, lipid, and glucose were estimated spectrophotometrically at 24 and 48 h after treatments. The levels of protein, glucose, and lipid in hemolymph showed dose- and time-dependent changes. These results indicated that treatment with ETF may result in significant physiological changes in pests. Consequently, it is likely that ETF can be a promising agent for use in integrated pest management programs as ecofriendly biopesticides.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-182-B-183
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soil Stabilization with Using Waste Materials against Freezing Thawing Effect
    Autorzy:
    Yilmaz, F.
    Kamiloğlu, H.
    Şadoğlu, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402431.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.60.Kk
    89.60.-k
    Opis:
    Freezing-thawing processes hapenning in seasonally cold climate cause deformation of soil in time of freezing and strength loss while thawing. Problems of ground frost heave and soil softening belong to the important factors, that could cause serious damage and financial loss. Bayburt tuff and tuffites known as Bayburt Stone mines, located around Bayburt, play important role on economy of the Bayburt city. As a result of researches in 2005 total of 2 535 700 tons proved reserve were determined several places in Bayburt. The goal of this study is proving, that deposits of Green Bayburt Stone wastes, created in the stone quarries during the stone processing, can be used as a stabilizing material. By recycling the waste material rejected stone was mixed with lime and used as a soil stabilizator against freezing-thawing effect. Prepared natural and stabilized soil samples were subjected to freezing-thawing cycles after curing for 28 days. After the freezing-thawing cycles, compressive strength of the samples was measured to investigate the influence of the additives on the freezing-thawing properties of soil samples. As a result of this study, it was determined that samples stabilized with Green Bayburt Stone mixtures have high freezing-thawing durability as compared to unstabilized samples. As a consequence, it was seen that those mixtures can be successfully used as an additive material to enhance the freezing-thawing effects of cohessive soils.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-392-B-394
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of New York/New Jersey Harbor Sediments
    Autorzy:
    Jones, K. W.
    Feng, H.
    Stern, E. A.
    Neuhäusler, U.
    Osán, J.
    Marinkovic, N.
    Song, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044657.pdf
    Data publikacji:
    2006-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.60.-k
    89.20.-a
    Opis:
    Sediments found in waterways around the world may contain toxic compounds of anthropogenic origin that can harm the environment and human health. As a result, it is often necessary to remove them and find disposal methods that are environmentally and economically acceptable. Here, we report on results obtained in an experimental program to characterize the nature of the sediment contamination. The objective was to gain a better understanding of the properties of the sediments to develop better methods for understanding the fate and transport of the contaminants and for improving methods for their removal from the sediments. Our investigations made use of X-ray facilities at the Brookhaven National Synchrotron Light Source and the European Synchrotron Radiation Facility at Grenoble, France. The experiments included: measurements of the microstructure of the sediments using computed microtomography, X-ray absorption, and fluorescence microscopy with resolutions as low as 0.2 micrometers to obtain information on the relationships of organic and mineral components of the sediments and on the distribution of contaminants on the surfaces of the sediment grains, investigation of functional groups of chemical compounds using X-ray absorption near-edge spectroscopy and Fourier transform infrared spectroscopy. Scanning electron microscopy and electron probe measurements were made to ascertain the morphology of the sediment surfaces and the distribution of metals on individual sediment grains.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 3; 279-286
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Investigation of Radionuclide Concentrations in Soil and Lifetime Cancer Risk Due to Gamma Radioactivity in Zonguldak, Turkey
    Autorzy:
    Koray, A.
    Akkaya, G.
    Kahraman, A.
    Kaynak, G.
    Baldık, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031848.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.88.+y
    89.60.-k
    Opis:
    The distributions of ²²⁶Ra, ²³²Th, ⁴⁰K and ¹³⁷Cs activity concentrations were determined using a high-purity germanium detector in uncultivated surface soil samples collected from Zonguldak. The range of ²²⁶Ra, ²³²Th, ⁴⁰K and ¹³⁷Cs activity concentrations varied from 10.5 ± 2.0 to 98.0 ± 4.3 Bq kg¯¹ (mean value 28.8± 4 Bq kg¯¹), from 12.9 ± 3.4 to 53.2 ± 5.1 Bq kg¯¹ (mean value 29.6± 3 Bq kg¯¹), from 190 ± 22 to 808 ± 43 Bq kg¯¹ (mean value 395± 31 Bq kg¯¹) and from <0.5 to 47.1± 3.8 Bq kg¯¹ (mean value 12.5± 2 Bq kg¯¹), respectively. In addition, the mean outdoor absorbed dose rates in air (terrestrial, terrestrial+cosmic), annual effective dose equivalent, radium equivalent activity and external hazard index were found to be 48 nGy h¯¹ (terrestrial), 56 nGy h¯¹ (terrestrial+cosmic), 58 μSv y¯¹, 101 Bq kg¯¹ and 0.27, respectively. The evaluated excess lifetime cancer risks (ELCRs) varied from 0.13× 10¯³ to 0.36× 10¯³ with a mean value of 0.20× 10¯³.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 1122-1125
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Carburizing by Valorization of Organic Waste
    Autorzy:
    Boutessouna, B.
    Allaoui, O.
    Allaoui, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031860.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.65.-b
    89.60.-k
    Opis:
    The organic waste recycling problem remains an important economic issue for the industry, where much research is done in this area. In this study, we are interested in the enhancement of some organic waste from slaughterhouses (blood and horns) with two objectives: recycling wastes and producing cheap cement for surface carburizing. The waste is converted into coal and added to an activator to produce a solid medium, witch can be used for surface carburizing of carbon steels. Preparation of waste and physical and chemical carbonating of blood and horns resulted in production of coal, that was used as an effective carbon source for cementation treatment. Comparison of the obtained results with other works on carburizing treatment, using industrial solid mixtures, has shown that carburizing layers in both cases are very similar. Indeed, metallographic analysis, X-ray diffraction and Vickers hardness testing of obtained layers have led to results very similar to those in literature.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 1173-1175
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of natural radioactivity of surface soil samples in the vicinity of Edirne-Turkey
    Autorzy:
    Zaim, N.
    Tugrul, A.
    Atlas, H.
    Buyuk, B.
    Demir, E.
    Baydogan, N.
    Altınsoy, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070463.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.88.+y
    89.60.-k
    Opis:
    The study was carried out to determine radioactivity concentrations in surface soil samples of the city of Edirne in connection with the potential radiological hazards due to Chernobyl event. The natural radionuclide ((226)Ra, (232)Th and (40)K) contents were determined for nine different locations in nine different towns of the Edirne city. Radiation levels were measured. Natural beta-ray activity was also determined for the same locations. The average estimated activity values were determined and compared with reported values for other cities in Turkey and also for many countries of the world. The studied areas do not pose radiological risks to the inhabitants due to harmful effects of the ionizing radiation from the natural radioactivity of the soil.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 64-67
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Heterogeneous Reverse Osmosis Membranes Based Separation of Fluorides with Fly Ash Pretreatment
    Autorzy:
    Thaçi, B.
    Gashi, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402534.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.45.Mp
    89.30.ag
    89.60.-k
    Opis:
    The objective of this paper was to examine the separation efficiency of fluorides by heterogeneous reverse osmosis membranes made from cellulose acetate and modified coal with aryl diazonium salt (batch 318 K) and lignite based fly ash pretreatment. The effect of varying the feed concentration (400-100 mg/dm³) of sodium and ammonium fluorides on performances of these membranes using 400 mg/dm³ aqueous solution of sodium chloride as referent system at 1.76 MPa have been investigated. Practically no significant change in the membrane characteristics (product rate, and solute separation) by varying the above concentration of feed salt solutions. The high separation of fluoride (synthetic sample) ≈99% was obtained by resulting membranes pretreated with different amount and contact time of low cost adsorbent (fly ash) at pH 4. A sample of waste water effluents of cement industry was also treated with above membranes without pretreatment and the results are presented. These data indicate that the fluoride ion concentration are within acceptable level as far as environmental limits concerned, therefore, their practical application produced water of suitable quality, essentially free from fluorides.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-62-B-66
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Marble Dust for Soil Stabilization
    Autorzy:
    Yilmaz, F.
    Yurdakul, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031496.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.20.Kk
    94.05.59
    89.60.-k
    89.60.Ec
    Opis:
    Usage of marble dust was investigated for soil stabilization in the scope of utilization of waste material. Geotechnical properties, such as compaction, Atterberg limits, unconfined compressive strength of the mixtures and changes of these properties with the marble dust ratio were determined. From the test results it is seen that marble dust increases the mechanical properties of soil and application of dust wastes for soil stabilization will be an efficient practice in terms of solid waste management.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 710-711
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Importance of Solar Calculations for "Two Colored Rainbow System" in Istanbul
    Autorzy:
    Er, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402524.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    96.60.Ub
    96.60.Q
    89.60.-k
    89.30.Cc
    Opis:
    The sun radiation is the largest renewable energy source on the planet which can be used in technology by means of thermal, photovoltaic and concentrated solar power systems. In this study, two types of solar collectors, called the "Two Colored Rainbow System", were used as a source for water heating at the Faculty of Science and Letters, at Istanbul Technical University. The performance of solar water heating system was experimentally investigated. In the experimental study, the temperature of hot water storage tank versus time of the day was investigated. The average daily solar radiation at a location is often sufficient for a basic system analysis. The radiation of sun varies according to the location, date, time and conditions of climate. The change of sun radiation was computed using a determined set of parameters. This study was aimed to offer optimization of design parameters taking into account possible interferences during the operation of the system. Additionally, hourly solar radiation on tilted surfaces is measured in Istanbul. Data of solar radiation intensity were also collected using a standard solarimeter (pyrometer) via a data logger.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-477-B-478
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel metal(II) complexes with bidentate Schiff base ligand: Synthesis, spectroscopic properties and dye decolorization functions
    Autorzy:
    Karakaya, C.
    Dede, B.
    Cicek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065151.pdf
    Data publikacji:
    2016-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Ka
    82.80.-d
    89.60.-k
    Opis:
    The bidentate Schiff base ligand 4-chloro-2-[1-(4-phenylphenyl)ethylideneamino]phenol and its mononuclear Co(II), Ni(II), Cu(II) and Zn(II) complexes have been synthesized. Ligand and metal complexes were characterized by elemental analyses, magnetic susceptibility, molar conductivity, ¹H- and ¹³C-NMR, the Fourier transform infrared, UV-Vis, inductively coupled plasma optical emission spectrometry, and thermogravimetric-differential thermogravimetric studies. The results suggest that the mononuclear complexes have a metal to ligand mole ratio of 1:2 and the metal(II) ions are coordinated with the phenolic oxygen and imine nitrogen atoms. Octahedral structures are proposed for the complexes of the Schiff base ligand. Furthermore, the complexes were checked for their efficiency to decolorize the dye methylene blue. In our experiments we found that metal(II) complexes had an acceptable decolorization efficiency against the dye methylene blue.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 2; 208-212
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An investigation into strength and permittivity of compacted sand-clay mixtures by partial replacement of water with lignosulfonate
    Autorzy:
    Sezer, A.
    Mardani-Aghabaglou, A.
    Boz, A.
    Tanrınıan, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070228.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Rm
    83.80.Fg
    89.60.-k
    Opis:
    Strength and permeability of sand-bentonite mixtures are of main concern, particularly in liner design. This study presents the results obtained from an experimental investigation of strength and permittivity of compacted sand-bentonite mixtures in the presence of water-reducing admixture of lignosulfonate. For this, sand-bentonite mixtures containing 4, 8, 12, 16% of bentonite were subjected to standard Proctor tests, to obtain the optimum water content and maximum void ratio of the mixtures. Similar specimens were prepared by partially replacing 0.5, 1 and 2% of water in the mixture with lignosulfonate. Additional specimens containing 16% of bentonite were prepared with 5% deviation towards the wet and dry sides of optimum water content, which was partially replaced with lignosulfonate for evaluation of the effects of deviation from optimum moisture content during densification. It was observed that partial replacement of water with lignosulfonate slightly increases the strength and decreases the permittivity, and that this effect was more pronounced as the replacement level was increased. Additionally, test results reveal that lignosulfonate replacement was more effective on the dry side of optimum water content.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 23-27
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Nuclear Microprobe - a Challenging Tool in Plant Sciences
    Autorzy:
    Mesjasz-Przybyłowicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028925.pdf
    Data publikacji:
    2001-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.60.-k
    41.75.-i
    07.78.+s
    Opis:
    The nuclear microprobe is a microanalytical tool capable of quantitative studies of elemental distribution at the ppm level with a spatial resolution of the order of 1μm. This sensitivity is adequate for most elements of interest, and the spatial resolution is acceptable for studies of elemental distribution in organs, tissues, and cells. The main techniques used in plant science are particle induced X-ray emission using protons, proton backscattering, scanning transmission ion microscopy, and particle induced gamma-ray emission. Specimen preparation is the most difficult part of analysis, and only cryotechniques are recommended presently for all types of microanalytical studies.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 5; 659-668
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Ammoxidation Process on $NO_2$ Sorption Abilities of Active Carbons
    Autorzy:
    Nowicki, P.
    Pietrzak, R.
    Dobkiewicz, M.
    Wachowska, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1536483.pdf
    Data publikacji:
    2010-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    81.05.Rm
    81.65.-b
    89.60.-k
    Opis:
    The paper presents results of a study on obtaining N-enriched active carbons from Polish brown coal and on their use as adsorbents for removal of pollution from gas phase. The crushed precursor was subjected to carbonisation at 500, 600 and 700°C in argon atmosphere. The chars obtained were activated by KOH at 800°C. The active carbons were further subjected to the ammoxidation at 350°C for 3 h, by a mixture of ammonia and air at the ratio of 1:3. The final products were microporous active carbons of well-developed surface area reaching to 2849 $m^2$/g and pore volume to 1.49 $cm^3$/g, showing mixed acid-base character of the surface. The results have shown that a suitable choice of the carbonisation, activation and ammoxidation procedures for brown coal can lead to obtaining activated carbons with high nitrogen dioxide adsorption ability, reaching from 16.9 to 36.4 mg $NO_2$/g.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 3; 493-499
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbonaceous Materials Obtained from Sewage Sludge for $NO_2$ Removal under Wet Conditions at Room Temperature
    Autorzy:
    Pietrzak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1536471.pdf
    Data publikacji:
    2010-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Fn
    81.05.-t
    81.05.Rm
    82.65.+r
    89.60.-k
    Opis:
    The effect of the processes of carbonisation and activation on adsorbents obtained from sewage sludge and their sorption properties towards $NO_2$ were studied. Carbonaceous adsorbents were obtained by carbonisation of sewage sludge at 600°C for four different times 30, 60, 90 and 120 min followed by activation of the carbonisates by $CO_2$ at 800°C for 60 min. Adsorption of $NO_2$ was carried out in wet air. It has been shown that by appropriate thermal and chemical treatment of sludge, mesoporous adsorbents capable of $NO_2$ removal can be obtained. The sorption abilities of the carbonised and activated samples to adsorb $NO_2$ have been shown to increase with increased time of carbonisation and reach maximum for the carbonisation maintained for 90 min. Further increase in this time causes a decrease in the adsorption abilities of the samples. The sorption properties of the carbonisates have been proved to be determined by the chemical character of the surface, while those of the activated samples - by the porous structure.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 3; 487-492
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Sediments Causing Damage to Water Meters in a Large Drinking Water Distribution System
    Autorzy:
    Kopeć, M.
    Roman, M.
    Kąc, M.
    Budziak, A.
    Paluszkiewicz, C.
    Zarzycki, A.
    Kąc, S.
    Dutkiewicz, E.
    Cichoń, T.
    Bochnia, T.
    Kwiatek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030652.pdf
    Data publikacji:
    2018-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.60.-k
    78.70.En
    61.05.cp
    82.80.-d
    82.80.Gk
    Opis:
    Preliminary studies on the sediments collected from water meters of Krakow water supply system were performed in the cooperation with the Municipal Water Supply and Sewage. Creation and deposition of sediments on the measuring devices installed in the water supply system is a serious technological and economical problem for water companies, defectively operating for this reason water meters must be replaced. It is evident that knowledge of the chemical and phase composition of sediments is an important step towards resolving the problem of impurities in water supply systems. Four different samples of sediments, coming from water meters, were investigated using the proton-induced X-ray emission, the X-ray diffraction, the Fourier transform infrared and Raman spectroscopy. The X-ray methods revealed presence of amorphous and fine-crystalline phases as well as high content of iron-based compounds. As a crystalline phase, the most frequently appeared: goethite, lepidocrocite, iron oxides (hematite, maghemite, magnetite), calcium carbonate, and quartz. In one of the samples, the nanocrystalline phase was found and identified as hydrous iron oxyhydroxide ferrihydrite. Vibrational spectroscopy methods confirmed the composition of crystalline phases as well as enabled to estimate the abundance of amorphous phase in samples.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 2; 296-301
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Alternative Random Matrix Approach in Analysis of Correlations in Financial Data
    Autorzy:
    Sawa, M.
    Grech, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1388194.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.Tp
    02.60.-x
    89.20.-a
    89.75.-k
    89.65.Gh
    89.75.Fb
    Opis:
    We present an alternative method based on random matrix approach that enables to distinguish the respective role of temporal autocorrelations inside given time series and cross correlations between various time series. The proposed algorithm is based on the properties of Wigner eigenspectrum of random matrices instead of commonly used Wishart eigenspectrum methodology. It is then qualitatively and quantitatively applied to financial data of stocks building WIG 30 - the main Warsaw Stock Exchange Index.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3A; A-118-A-122
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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