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Tytuł:
Impact of restrictions on the COVID-19 pandemic situation in Poland
Autorzy:
Herman, Sergiusz
Powiązania:
https://bibliotekanauki.pl/articles/2108274.pdf
Data publikacji:
2022-09-14
Wydawca:
Główny Urząd Statystyczny
Tematy:
COVID-19
coronavirus
lockdown
synthetic control method
treatment effect
Opis:
The COVID-19 pandemic has had a substantial impact on public health all over the world. In order to prevent the spread of the virus, the majority of countries introduced restrictions which entailed considerable economic and social costs. The main goal of the article is to study how the lockdown introduced in Poland affected the spread of the pandemic in the country. The study used synthetic control method to this end. The analysis was carried on the basis of data from the Local Data Bank and a government website on the state of the epidemic in Poland. The results indicated that the lockdown significantly curbed the spread of the COVID-19 pandemic in Poland. Restrictions led to the substantial drop in infections - by 9500 cases in three weeks. The results seem to stay the same despite the change of assumptions in the study. Such conclusion can be drawn from the performance of the placebo-in-space and placebo-in-time analyses.
Źródło:
Statistics in Transition new series; 2022, 23, 3; 127-146
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Treatment Effect of Heavy Metal Pollution from Sewage Sludge in Wastewater Treatment Plant Discharge in China’s Nanjing MV Industrial Park
Autorzy:
Xu, Lingjuan
Sun, Fengqi
Han, Xiuyan
Powiązania:
https://bibliotekanauki.pl/articles/2174921.pdf
Data publikacji:
2022
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
assessment of treatment effect
heavy metal pollution
niche model
sewage sludge
wastewater treatment plant
Opis:
To explore methods for a comprehensive assessment of the treatment effect of heavy metal pollution in the sewage sludge from China’s industrial parks, we studied the wastewater treatment plant of the Nanjing MV Industrial Park as an example. Eight common heavy metals in sewage sludge – Zinc (Zn), Copper (Cu), Lead (Pb), Mercury (Hg), Chromium (Cr), Nickel (Ni), Arsenic (As), Cadmium (Cd) were studied. The treatment effect of these containments was comprehensively assessed using the absolute niche fitness model, the relative niche model and the spatial niche fitness model. All three models showed that Pb > Cu > Ni > Hg > Cd > Cr > Zn > As in the samples. However, they produced – different numerical values – the absolute niche suitability model < the spatial niche suitability model < and the relative niche suitability model. Therefore, we concluded that special attention should be paid to the carcinogenic risk of As and Cr heavy metals to the person exposed to the sewage sludge.
Źródło:
Rocznik Ochrona Środowiska; 2022, 24; 276--293
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Understanding the Synergic Corrosion Issues with Regard to the Water Treatment Station
Autorzy:
Włodarczyk, Renata
Majek, Klaudiusz
Powiązania:
https://bibliotekanauki.pl/articles/125250.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
chlorination
corrosion microbiology
pitting corrosion
synergy effect
water treatment station
Opis:
The paper presents the examples of damage of elements caused by incorrect assessment of pipeline work conditions. The presented damage cases resulted in the need to replace pipelines. This work is an analysis pertaining to the impact of chemical and microbiological synergy of corrosion on stainless steel pipelines. The paper investigates the corrosion mechanisms that may occur under normal operating conditions at each water treatment station, and the methods of counteracting the corrosion were indicated. The analysis of the corrosion mechanisms was formulated taking into account the design stage, – the correctness of the steel grade choice by the designer, the stage of implementation – the most common implementation errors, and the operational stage – optimization of the technological system work and the effects of the introduced changes. The analysis was carried out at a water treatment plant in Poland with a maximum flow of 20,000 m3 a day-1, which draws raw water from deep water intakes and from a surface intake. The treatment technology includes an aeration system (aeration) and a two-stage treatment process using sand and carbon filters. The disinfection process and prophylaxis in the water treatment plant is based on the use of chlorine gas.
Źródło:
Journal of Ecological Engineering; 2019, 20, 6; 90-96
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hemp - its use in prevention and treatment of diseases of companion animals
Konopie - zastosowanie w zapobieganiu i leczeniu chorób zwierzat towarzyszących
Autorzy:
Kępińska-Pacelik, J.
Biel, W.
Powiązania:
https://bibliotekanauki.pl/articles/3136053.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
companion animal
animal disease
prevention
treatment
hemp
Cannabis sativa
cannabidiol
pharmacological effect
Źródło:
Acta Scientiarum Polonorum. Zootechnica; 2021, 20, 3; 15-21
1644-0714
Pojawia się w:
Acta Scientiarum Polonorum. Zootechnica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of combined treatment with vigabatrin and antihypertensive drugs against electroconvulsions in mice
Autorzy:
Lukawski, K.
Raszewski, G.
Czuczwar, S.J.
Powiązania:
https://bibliotekanauki.pl/articles/3559.pdf
Data publikacji:
2015
Wydawca:
Instytut Medycyny Wsi
Tematy:
combined treatment
treatment
vigabatrin
antihypertensive drug
electroconvulsion
mice
mouse
receptor antagonist
diuretic drug
cardiovascular drug
human disease
anticonvulsant effect
Opis:
Introduction and objective: It is likely that cardiovascular drugs will be used in epileptic patients because heart failure and hypertension are common comorbid conditions with epilepsy. Experimental studies show that some cardiovascular drugs can affect the protective activity of antiepileptics. The aim of this study was to examine the effects in mice of angiotensin-converting enzyme (ACE) inhibitors (captopril and perindopril), angiotensin AT1 receptor antagonists (losartan and candesartan) and diuretics (hydrochlorothiazide and ethacrynic acid) on the anticonvulsant activity of vigabatrin (VGB), a second generation antiepileptic drug. Material and Methods: Adult Swiss mice were used in the study. The anticonvulsant action of VGB was assessed in the maximal electroshock seizure threshold test. Combined treatment with VGB and antihypertensive drugs was also tested for adverse effects in the passive avoidance task and chimney test. All drugs were administered intraperitoneally. Results: Captopril (50 mg/kg), perindopril (10 mg/kg), losartan (50 mg/kg), candesartan (8 mg/kg), hydrochlorothiazide (100 mg/kg) and ethacrynic acid (100 mg/kg) did not influence the protective action of VGB. The combined treatment with VGB (700 mg/kg) and antihypertensive drugs showed a strong tendency towards impaired retention in the passive avoidance task, and in the case of the combination of VGB with ethacrynic acid it reached statistical significance (P &lt; 0.05). Mice were not disturbed in the chimney test following applied treatment. Conclusions: From the preclinical point of view, the use of the tested antihypertensive drugs in patients treated with VGB seems neutral regarding its anticonvulsant activity.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2015, 09, 1
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of wood ash, river sand, mineral oil and dry pepper (Capsicum spp) dust on the population of Sitophilus zeamais (Motschulsky, 1855) (maize weevil) in maize grain storage
Autorzy:
Adiaha, Monday
Agba, Oliver
Obio, Ekpe
Undie, Utang
Asuquo, Offiong
Powiązania:
https://bibliotekanauki.pl/articles/1112671.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Control
Hymenocardia acida
Sitophilus zeamais
Zea mays
corn
effect
food
pest
population
quality
treatment
Opis:
An experiment to evaluate the effect of wood ash, river sand, mineral oil and dry pepper (Capcium spp) dust on the population (control) of Sitophilus zeamais (Motschulsky, 1855) (Coleoptera: Curculionidae) (maize weevil) was conducted. The experiment was laid out in a Completely Randomized Design (CRD) consisting of five (5) treatments; 0g, 5g river sand, 5g dry pepper dust, 5g wood ash and 5g mineral oil. All treatment were replicated three times. Data were taken on the number of population of Sitophilus zeamais emerging from individual treatments. Herein, weight loss on grain maize was taken for S. zeamais infestation. The effect of the various treatments on maize seed with S. zeamais was not significant (P>0.05), although the highest population numbers of the weevil was recorded in the control (0g). Zero population of S. zeamais was recorded in wood ash treatment at 5g, which significantly (P<0.05) protected the grains over the control. Significant (higher) weight loss was recorded in the control since no treatment was applied. All treatments except the control indicate the potential of reducing (controlling) weevil numbers. Data obtained in these experiments reveal that wood ash, pepper dust and river sand produced the most protective/control effect on the population of the weevil over the control. Result of the study show that river sand, pepper dust, wood ash and mineral oil (vegetable oil) performed positively, and hence, exert protectant properties on maize grains.
Źródło:
World News of Natural Sciences; 2018, 18, 2; 241-251
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of seborrheic dermatitis: The efficiency of sertaconazole 2% cream vs. tacrolimus 0.03% cream
Autorzy:
Goldust, M.
Rezaee, E.
Raghifar, R.
Hemayat, S.
Powiązania:
https://bibliotekanauki.pl/articles/5733.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
treatment
seborrheic dermatitis
efficiency
sertaconazole cream
tacrolimus cream
drug effect
antifungal agent
Malassezia
human disease
Źródło:
Annals of Parasitology; 2013, 59, 2
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of enzymatic effects on pit membranes using light and scanning electron microscopy
Autorzy:
Durmaz, S.
Yildiz, U.C.
Ozturk, M.
Serdar, B.
Powiązania:
https://bibliotekanauki.pl/articles/52338.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
investigation
enzymatic effect
pit membrane
light electron microscopy
scanning electron microscopy
spruce wood
permeability
enzymatic treatment
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2016, 59, 198
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Remelting on Microstructure of the AlSi9Cu3 Alloy with Higher Iron Content
Autorzy:
Matejka, M.
Bolibruchova, D.
Powiązania:
https://bibliotekanauki.pl/articles/380982.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metallography
heat treatment
Al-Si-Cu alloy
remelting effect
metalografia
obróbka cieplna
stop Al-Si-Cu
efekt przetapiania
Opis:
Secondary or multiple remelted alloys are common materials used in foundries. For secondary (recycled) Al-Si-Cu alloys, the major problem is the increased iron presence. Iron is the most common impurity and with presence of other elements in alloy creates the intermetallic compounds, which may negatively affect the structure. The paper deals with effect of multiple remelting on the microstructure of the AlS9iCu3 alloy with increased iron content to about 1.4 wt. %. The evaluation of the microstructure is focused on the morphology of iron-base intermetallic phases in caste state, after the heat treatment (T5) and after natural aging. The occurrence of the sludge phases was also observed. From the obtained results can be concluded that the multiple remelting leads to change of chemical composition, changes in the final microstructure and also increases sludge phases formation. The use of heat treatment T5 led to a positive change of microstructure, while the effect of natural aging is beneficial only to the 3rd remelting.
Źródło:
Archives of Foundry Engineering; 2018, 18, 4; 25-30
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the term of mulching and herbicides spraying on ‘Foxtrot’ tulip flowering and bulbs yield
Autorzy:
Marcinek, B.
Durlak, W.
Szmagara, M.
Galant, H.
Węgrzyn, A.
Powiązania:
https://bibliotekanauki.pl/articles/12676175.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
plant cultivation
tulip
Foxtrot cultivar
ornamental plant
flowering plant
plant flowering
plant yield
bulb
mulching
spraying
herbicide treatment
herbicide effect
application term
Opis:
The experiment studied the effect of various mulching terms of ‘Foxtrot’ tulips with wheat straw in combination with spraying of plantations with herbicides using various doses and different amounts of working liquid. The mulch was laid out just after planting and after the soil had frozen. The experiment included combinations, in which the mulch was left until the end of the growing season or removed in spring. Spraying with single (linuron 675 g·ha–1 + lenacyl 1000 g·ha–1) or double herbicide dose (linuron 1350 g·ha–1 + lenacyl 2000 g·ha–1) was made before covering the soil with mulch and also on mulch – two weeks after planting the bulbs, or in the spring after thawing the soil. Volumes of 300 dm3 and 600 dm3 of working liquid were used for spraying. Tulips covered with mulch bloomed 2–3 days later and formed longer shoots as compared to non-mulched ones. The highest yield of marketable bulbs and the first-selection ones was obtained from tulips mulched immediately after planting and sprayed 2 weeks later with herbicides used in a single dose of 600 dm3 of a working liquid. Mulching of tulips after soil freezing and removal of mulch in spring adversely affects the number and weight of commercial bulbs. The lowest yield was obtained in combinations, in which the mulch was not used. The use of additional nitrogen fertilization before laying out the mulch did not affect the yield of tulips. Herbicides can be used both before mulching and after covering the plantation with mulch. It is not necessary to increase the dose of the agent and the amount of water.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 4; 71-82
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser melted steel free surface formation
Tworzenie powierzchni swobodnej laserowo przetapianej stali
Autorzy:
Siwek, A.
Powiązania:
https://bibliotekanauki.pl/articles/264124.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
obróbka laserowa
modelowanie
analiza numeryczna
efekt Marangoniego
konwekcja, geometria strefy przetopionej
laser treatment
simulation
numerical analysis
Marangoni effect
convection
geometry of the melted zone
Opis:
Two-dimensional mathematical model of recasting steel by laser was presented in this paper. Surface velocity and liquid temperature for several powers of laser beams and sulfur contents were obtained as results of numerical modeling of liquid flow and heat exchange processes. The shape of free surface in a melted zone was computed with the use of iterative method proposed in this paper.
W pracy zaprezentowano dwuwymiarowy model matematyczny laserowego przetapiania stali. Jako wynik numerycznego modelowania procesów przepływu cieczy i wymiany ciepła, otrzymano pole prędkości i temperatury cieczy dla kilku mocy wiązki laserowej oraz zawartości siarki. Korzystając z zaproponowanej w pracy metody iteracyjnej, obliczono kształt powierzchni swobodnej w strefie przetopionej.
Źródło:
Metallurgy and Foundry Engineering; 2007, 33, 1; 13-21
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new and fast method to obtain in vitro cultures of Huperzia selago (Huperziaceae) sporophytes, a club moss which is a source of huperzine A
Autorzy:
Szypula, W.J.
Mistrzak, P.
Olszowska, O.
Powiązania:
https://bibliotekanauki.pl/articles/58228.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
clubmoss
ground pine zob.clubmoss
club moss zob.clubmoss
in vitro culture
Huperzia selago
Lycopodium selago
Huperziaceae
sporophyte
huperzine A
sesquiterpene alkaloid
pharmaceutical effect
treatment
Opis:
This study presents a protocol for a fast and effective in vitro axenic culture of Huperzia selago (Huperziaceae Rothm.) sporophytes, a club moss which is a source of huperzine A, an alkaloid of a considerable therapeutic potential extensively investigated for its uses as treatment for some neurodegenerative diseases. The proposed procedure allowed approximately tenfold shortening of the species developmental stages with the omission of the gametophyte stage while the sporophyte mass could be increased tenfold within a 6-month period. The cultures were established using vegetative propagules (bulbils) procured from sporophytes growing in the wild without degrading the habitats of this endangered plant species. Explants underwent surface and internal disinfection to eliminate the epiphytic and endophytic bacteria and fungi. In in vitro cultures, the optimum results were achieved using Moore (Mr) medium without growth regulators or supplemented with 0.015 mg/l IBA and 0.3 mg/l kinetin. These media ensured both viability of the propagules and their further development. The biomass growth index for H. selago sporophytes grown from propagules, determined at 3 months of culture (1 passage) on Mr medium with IBA and kinetin was 650%. At 6 months, the biomass growth index increased to 1114%. Vigorous growth of adventitious roots, especially on Mr medium with the addition of 0.25 mg/l NAA, and callus formation on shoot apices were observed. At 6 months of culture, some sporophytes obtained from the bulbils were used as the initiating material for shoot subcultures, which developed best on Mr medium with IBA and kinetin.
Źródło:
Acta Societatis Botanicorum Poloniae; 2013, 82, 4
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation of the laser welding
Symulacja procesu laserowego spawania
Autorzy:
Siwek, A.
Powiązania:
https://bibliotekanauki.pl/articles/305496.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
obróbka laserowa
komputerowa dynamika płynów
efekt Marangoniego
przemiany fazowe
kształt strefy przetopionej
laser treatment
computational fluid dynamics (CFD)
Marangoni effect
metallurgical transformation
geometry of the melted zone
Opis:
The model takes into consideration thermophysical and metallurgical properties of th remelting steel, laser beam parameters and boundary conditions of the process. As a result of heating the material, in the area of laser beam operation a weld pool is being created whose shape and size depends on convection caused by the Marangoni force. The direction of the liquid stream depends on the temperature gradient on the surface and on the chemical composition as well. The model created allows to predict the weld pool shape depending on material properties, beam parameters, and boundary conditions of the sample.
Model uwzględnia własności termofizyczne i metalurgiczne przetapianej stali, parametry wiązki laserowej i warunki brzegowe procesu. W wyniku nagrzania materiału w obszarze działania wiązki lasera tworzy się jeziorko cieczy, którego kształt i rozmiar zależą od konwekcji wywołanej siłą Marangoniego. Kierunek strumienia cieczy zależy od gradientu temperatury na powierzchni, a także składu chemicznego. Utworzony model pozwala na przewidywanie kształtu strefy przetopionej w zależności od własności fizycznych materiału, parametrów wiązki i warunków brzegowych próbki.
Źródło:
Computer Science; 2008, 9; 137-146
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Molybdenum Addition on Mechanical Properties of Low Carbon HSLA-100 Steel
Wpływ dodatku molibdenu na własności mechaniczne niskowęglowej stali HSLA -100
Autorzy:
Bogucki, R.
Pytel, S.M.
Powiązania:
https://bibliotekanauki.pl/articles/352005.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high strength low alloyed steels
HSLA steels
effect of copper and molybdenum additions
microstructure
mechanical properties
heat treatment
stal HSLA
dodatek miedzi i molibdenu
mikrostruktura
właściwości mechaniczne
obróbka cieplna
Opis:
The results of mechanical properties and microstructure observation of low carbon copper bearing steel with high addition of molybdenum are presented in this paper. This steels were characterized by contents of molybdenum in the range from 1% to 3% wt. After the thermo -mechanical processing the steels were subsequently quenched and tempered at different temperatures (500-800°C) for 1h. The changes of mechanical properties as function of tempering temperature were typical for the steel with the copper addition. The sudden drop of impact resistance after tempering from 575°C to 600°C was caused probably by precipitates of Laves phase of type Fe2Mo.
W pracy przedstawiono wyniki badań własności mechanicznych oraz obserwacji mikroskopowych nisko węglowych stali z dodatkiem Cu o podwyższonej koncentracji molibdenu w zakresie od 1 do 3% wg. Po obróbce cieplno-plastycznej stale były hartowane i odpuszczane w rożnych temperaturach (500-800°C) przez 1 godzinę. Przebieg zmian własności mechanicznych w funkcji temperatury odpuszczania był zbliżony do przebiegu stali z dodatkiem miedzi. Silny spadek udarności po odpuszczaniu od 575 do 600°C spowodowany był prawdopodobnie procesami wydzieleniowymi fazy Lavesa typu Fe2Mo.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 3; 859-864
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of titanium dioxide/attapulgite composites and their application in treating Reactive Black KN-B wastewater
Autorzy:
Xie, A.
Luo, S.
Chaoyao, Y.
Powiązania:
https://bibliotekanauki.pl/articles/207828.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wastewater treatment
titanium dioxide
X ray diffraction
adsorption capacities
adsorption kinetics
Langmuir models
photocatalytic effect
oczyszczanie ścieków
dwutlenek tytanu
dyfrakcja promieniowania X
zdolności adsorpcyjne
kinetyka adsorpcji
modele Langmuira
efekt fotokatalityczny
Opis:
Removal of water soluble Reactive Black KN-B from aqueous media by means of titanium dioxide/attapulgite (TiO2/ATP) composites was studied in a batch system. The composites were investigated using X-ray diffraction and surface area analysis. Under UV irradiation, the photocatalytic effect of TiO2/ATP composites, pH and reaction temperature on the decolorization rate of Reactive Black KN-B were investigated in detail. The adsorption experiments of TiO2/ATP composites showed that the isotherms and adsorption kinetics were well followed by the Langmuir model and the zero order equation, respectively. The maximum adsorption capacity of TiO2/ATP composites for Reactive Black KN-B calculated by the Langmuir model was 20.08 mg g-1. It can be concluded that the TiO2/ATP composites could be good photocatalysts/adsorbents for treating Reactive Black KN-B wastewater.
Źródło:
Environment Protection Engineering; 2014, 40, 1; 45-56
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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