Temat: coefficient - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The Influence of the Presence of Vegetations in Floodplains on Flood Risks
Autorzy:: Walczak, N.
Hammerling, M.
Spychała, M.
Nieć, J.
Powiązania:: https://bibliotekanauki.pl/articles/123654.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: flood area
flow velocity
resistance coefficient
roughness coefficient
vegetation
Opis:: The movement of water on flood areas depends mainly on the geometric parameters of vegetation, which as a dynamic factor causes a high changeability of flow conditions during the year. The actual ecological trend, whereby there is a tendency to leave the plants in the floodplain, imposes the necessity on engineers to develop accurate methods of determining the effect of vegetation on what used to be once a commonly occurring flood risk. According to the report on national security risk, elaborated by the Government Security Centre, flooding is the most common such risk. This is most likely to occur among all the risks included in the National Crisis Management Plan and brings the greatest number of negative effects. In order to mitigate the negative phenomena related to floodplains, the methodology and calculation of the average flows, using the Maninng and Darcy-Weisbach models is presented.
Źródło:: Journal of Ecological Engineering; 2015, 16, 5; 160-167
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Method of Removal Yttrium (III) and Ytterbium (III) From Dilute Aqueous Solutions
Autorzy:: Lobacheva, O.
Dzhevaga, N.
Danilov, A.
Powiązania:: https://bibliotekanauki.pl/articles/123428.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: ion flotation
sodium dodecyl sulfate
distribution coefficient
separation coefficient
removal
Opis:: Yttrium (III) and ytterbium (III) cations ion flotation from diluted aqueous solutions in the presence of chloride ions using sodium dodecyl sulfate as collector agent were studied. Y (III) and Yb (III) distribution and recovery coefficients as a function of aqueous phase рН value at different sodium chloride concentrations were received. Yttrium (III) and ytterbium (III) chloro and hydroxo complexes instability constants were calculated. The calculation of separation coefficient at рН specified values depending on chloride ion concentration was conducted. Maximum separation coefficient was observed when chloride concentration of 0.01 M is 50 at рН 7.8. Ksep is minimal in nitrate medium ans is 3 at рН 7.0. At sodium chloride concentration of 0.05 М Ksep is 9 at рН 7.8.
Źródło:: Journal of Ecological Engineering; 2016, 17, 2; 38-42
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Assessment of Phytoremediation of 137Cs Contaminated Soils During the Cultivation of Nectar-Pollinating Plants
Autorzy:: Razanov, Serhii
Kutsenko, Mykola
Klymenko, Mykola
Bakhmat, Mykola
Klymenko, Oleksandr
Bakhmat, Oleh
Holubieva, Tetiana
Kovalchuk, Nataliia
Mazurak, Oksana
Powiązania:: https://bibliotekanauki.pl/articles/24201711.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: soil
milk thistle
white melilot
plant
phytoremediation
137Cs
accumulation coefficient
danger coefficient
Opis:: The man-made activity of mankind has led to the emergence of many global problems and caused the deterioration of the quality of the natural environment (air, water, soil). Of particular concern is the contamination of agricultural land with toxicants, in particular, radionuclides, which, entering the soil – plant – human body food chain, can reach toxic levels. Therefore, an important task is the removal of hazardous substances from the soil. Phytoremediation can be one of the effective methods for reducing its pollution. The article examines the effectiveness of phytoremediation of soils contaminated as a result of the accident at the Chernobyl nuclear power plant in certain territories of Polissia of Ukraine (Korosten district of Zhytomyr region). Nectar-pollinating plants were selected for the research, which was carried out for two years: great globe-thistle (Echinops sphaerocephalus), milk thistle (Silybum marianum), and white melilot (Melilotus albus). The results of the research showed that in the dry vegetative mass of milk thistle, great globe-thistle, and white melilot, the specific activity of 137Cs over the two years of research was in the range from 30.8 Bq/kg to 238.5 Bq/kg, the accumulation coefficient – from 0.135 to 0.985, and the hazard coefficient – from 0.055 to 0.395. The highest indicators of specific activity and accumulation coefficient of 137Cs were observed in the vegetative mass of the white melilot, which amounted to 238.5 Bq/kg and 0.96, respectively, comparatively lower values – 2.3 times and 2.3 times were found in the vegetative mass of milk thistle, 2.8 times and 7.1 times – in the vegetative mass of the great globe-thistle. At this level of accumulation of 137Cs in the vegetative mass of nectarine plants from the soil, on average, over two years of research, 1130550 Bq of this radionuclide was removed from the soil per hectare of agricultural land with milk thistle, 621250 Bq with great globe-thistle, and 2851650 Bq with white melilot. The removal of 137Cs with the vegetative mass of nectarine plants reduced the content of this radionuclide in the soil per 1 kg – from 3.4% to 8% on average over two years of research.
Źródło:: Journal of Ecological Engineering; 2023, 24, 5; 316--321
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Particularities of Forming Desert Pastures Near Settlements of Southern Balkhash (Kazakhstan)
Autorzy:: Kubenkulov, Kanaibek
Naushabaev, Ashat
Abdirahymov, Niet
Rustemov, Bagdat
Bazarbaev, Samat
Powiązania:: https://bibliotekanauki.pl/articles/124750.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: degradation
pasture
dominant
soil
spectral brightness coefficient
Opis:: The results of field soil-and-geobotanical research study of the pastures near settlement Lepsy located in the desert area of the Almaty region are shown. The particularities of the climatic conditions for the formation of desert pastures in Southern Balkhash area are described. The characteristics of the plant cover of the pastures and the graybrown soils formed under them are provided. The effects of long unsystematic use of the pastures in the conditions of the growth of concentrated grazing areas near settlements on the degradation of the plant and soil covers have been identified, and four stages of degradation have been outlined by seven indicators. In determining the boundaries, the spectrometric characteristics of the surface of the pastures in the spectrum of near-infrared (600–750 nm), blue (400–500 nm), and red (500–600 nm) bands were used.
Źródło:: Journal of Ecological Engineering; 2019, 20, 8; 129-134
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Integration Remote Sensing and Meteorological Data to Monitoring Plant Phenology and Estimation Crop Coefficient and Evapotranspiration
Autorzy:: Hassan, Diaa Fliah
Abdalkadhum, Aysar Jameel
Mohammed, Rafal J.
Shaban, Amin
Powiązania:: https://bibliotekanauki.pl/articles/2086414.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: actual evapotranspiration
crop coefficient
remote sensing
vegetation index
Opis:: The water requirements of the wheat crop are represented by the actual evapotranspiration, which depends on the meteorological data of the study area and the amount of water consumed during the season. Estimation of crop coefficients (Kc) and evapotranspiration (ETc) using remote sensing data is essential for decision-making regarding water management in irrigated areas in arid and semi-arid large-scale areas. This research aims to estimate the crop coefficient calculated from remote sensing data and the actual evapotranspiration values for the crop. The FAO Penman-Monteith equation has been used to estimate the reference evapotranspiration from meteorological data. Linear regression analysis was applied by developing prediction equations for the crop coefficient for different growth stages of comparing with the vegetation cover index (NDVI). The results showed that (R2 = 0.98) between field crop coefficient and crop coefficient predicted from (Kc = 2.0114 NDVI-0.147) in addition to (RMSE = 0.92 and (d = 0.97).
Źródło:: Journal of Ecological Engineering; 2022, 23, 4; 325--335
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Oszacowanie zdolności filtracyjnych odpadów poflotacyjnych wbudowanych w zapory składowisk namywanych
Estimation of filtration capacity of postflotation tailings embedded in dams of tailings deposition sites
Autorzy:: Tschuschke, W.
Skowrońska, D.
Powiązania:: https://bibliotekanauki.pl/articles/399909.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: współczynnik wodoprzepuszczalności
odpady poflotacyjne
permeability coefficient
post-flotation tailings
Opis:: Budowa bardzo dużych obiektów unieszkodliwiania odpadów wydobywczych, do których niewątpliwie kwalifikują się mokre składowiska odpadów poflotacyjnych, jest skomplikowanym zadaniem inżynierskim, wymagającym rozwiązania szeregu zagadnień technicznych i środowiskowych. Projektowanie, budowa i eksploatacja takiego obiektu metodą obserwacyjną sprowadza się do weryfikacji założeń projektowych na podstawie prowadzonego na bieżąco monitoringu. Jednym z podstawowych zadań monitoringu jest, w miarę wypełniania składowiska odpadami, kontrola jakości formowanych nadbudów zapór, elementu konstrukcyjnego obiektu, odpowiedzialnego za jego stateczność. Wykorzystywanie do nadbudowy zapór wyselekcjonowanego z deponowanych odpadów materiału, wymaga zdefiniowania kryteriów uziarnienia i zagęszczenia, które przekładają się wprost na nośność i odkształcalność konstrukcji. Podstawowe badania kontrolne obejmują zatem analizy uziarnienia i właściwości fizycznych wbudowanego w zapory materiału. Dane te mogą być również wykorzystane do oszacowania zdolności filtracyjnych nasypu budowlanego. Brak możliwości odpływu, powodującego akumulację wody w obrębie nasypu, potencjalnie pogarsza warunki stateczności. W pracy zbadano przydatność wzorów empirycznych do oceny współczynnika filtracji odpadów, wzorów które powszechnie stosuje się do gruntów naturalnych. Zaproponowano również prostą formułę empiryczną pozwalającą oszacować współczynnik filtracji odpadów na bazie parametrów uziarnienia i zagęszczenia, określanych w rutynowych badaniach kontroli jakości formowanych nadbudów zapory.
Construction of very big mine tailings deposition sites, such as postflotation tailings ponds, is a complicated engineering task, in which several technical and environmental problems need to be solved. Designing, construction and operation of such an object applying the monitoring method consists in the verification of design assumptions based on continuous observations. One of the primary tasks of monitoring while the deposition site is being filled with tailings is to control quality of the formed dam embankments, as the structural element of the object responsible for its stability. In order to use material selected from deposited tailings in the construction of dams it is necessary to define grain size and compaction criteria, which directly affect load bearing capacity and deformation of the structure. For this reason main control tests include the analyses of grain size distribution and physical properties of the material embedded in the dams. These data may also be used to estimate filtration capacity of the embankment. A lack of drainage, causing accumulation of water within the embankment, may potentially deteriorate stability conditions. This paper presents the use of empirical formulas, i.e. formulas typically applied to natural soils, to assess permeability coefficient of tailings. A simple empirical formula was also proposed for the estimation of permeability coefficient of tailings based on grain size and compaction parameters determined in routine quality tests of constructed dam embankments.
Źródło:: Inżynieria Ekologiczna; 2015, 44; 95-103
2081-139X
2392-0629
Pojawia się w:: Inżynieria Ekologiczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Study on the Influence of Selected Technological Parameters of a Rotating Biological Contactor on the Degree of Liquid Aeration
Autorzy:: Szulżyk-Cieplak, J.
Tarnogórska, A.
Lenik, Z.
Powiązania:: https://bibliotekanauki.pl/articles/123213.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: biological rotating contactor
domestic wastewater
aeration
oxygen transfer coefficient
Opis:: The subject of the research involves a rotating biological contractor with a bi-directional longitudinal flow as an element of a synchronized system of disposal and biological treatment of domestic wastewater in small-bore sewerage. The rotor design is based on a system of corrugated protective pipes, arranged in coils wound around its rotation axis. The pipes are wound in a way that enables a bi-directional flow of liquids. During the rotor rotation in wastewater, the contactor is simultaneously emptied and filled with wastewater. The role of corrugated protective pipes is twofold; on the one hand, they constitute a surface for the biofilm development and on the other, they enable the flow of liquids, thus ensuring its aeration. The contactor design aims to achieve intensive aeration of transported wastewater, which will allow for greater development of microorganism populations participating in hybrid wastewater treatment, i.e. the methods involving activated sludge and trickling filter. An analysis on the influence of rotor operation kinematics on the efficiency of liquid aeration was conducted. The aeration capacity for variable rotational speed (0.7 rpm, 1.5 rpm, 2.0 rpm, 3.0 rpm) and direction of the contactor rotating element were calculated. In the considered case, oxygen transfer coefficient K_La was within the range of 0.011÷0.023 1/min. The obtained results indicate a clear connection between the system kinematics and the degree of liquid aeration in the contactor.
Źródło:: Journal of Ecological Engineering; 2018, 19, 6; 247-253
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Hydraulic Research for Lateral Plant Obstruction in an Open Channel
Autorzy:: Tymiński, Tomasz
Wolski, Krzysztof
Gruszczyński, Maciej
Xia, Jianxin
Ren, Huatang
Yao, Nijun
Powiązania:: https://bibliotekanauki.pl/articles/124647.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: fascine overfall
coefficient of discharge
local resistance
damming up
Opis:: The hydraulic model testing results of flow of a water stream through a lateral plant obstruction are presented in the paper. The plant element was formed by natural deciduous and coniferous tree branches filling the space between tree trunks set in chequered pattern. The experiments conducted in a horizontal, rectangular hydraulic channel included the measurements of flow intensity, difference in water surface level before and after the obstruction and filling of the channel on the upstream and downstream sides. A preliminary analysis of results was performed determining the coefficient of local losses of lateral plant obstruction. The coefficient of water discharge for the fascine overfall case assumed for the plant obstruction was determined as well.
Źródło:: Journal of Ecological Engineering; 2019, 20, 3; 214-218
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: The Effect of Hydrothermal Conditions on Oats Yields in East-Central Poland (1975–2005)
Autorzy:: Radzka, E.
Jankowska, J.
Markowska, M.
Powiązania:: https://bibliotekanauki.pl/articles/125480.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: hydrothermal coefficient
growing season
oats
yield
central-eastern Poland
Opis:: The objective of the work was to evaluate the effect of hydrothermal conditions on oats yields produced in east-central Poland. Hydrothermal conditions were determined based on the Sielianinov’s hydrothermal coefficient for nine IMGW (Institute of Meteorology and Water Management) stations located in the study area. The second data set consisted of oats yields compiled and published by the Main Statistical Office. Average yields as well as minimum and maximum yields were analysed. The relationship between oats yields and hydrothermal conditions was examined using a step-wise linear regression model. Correlation coefficients were negative in April and positive in June at all the stations. The relationships were confirmed by an analysis of regression equations. The regression equations also included coefficients for May and June which, however, were not statistically significant. Yield variation, described by regression equations of the dependence of oats yield on Sielianinov’s hydrothermal coefficient value was accounted for from 19 (Siedlce, Biała Podlaska) to 50% (Ostrołeka).
Źródło:: Journal of Ecological Engineering; 2015, 16, 3; 184-188
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Kształtowanie się współczynnika wilgotności gleby w zlewni potoku Mątny w Gorcach
Shaping of the wetness coefficient in the Mątny stream basin in the Gorce mountains
Autorzy:: Kruk, E.
Ryczek, M.
Malec, M.
Klatka, S.
Powiązania:: https://bibliotekanauki.pl/articles/400504.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: współczynnik wilgotności gleby
parametry fizjograficzne
GIS
wetness coefficient
physiographical parameters
Opis:: W pracy przedstawiono wyniki oznaczeń współczynnika wilgotności gleby, zdefiniowanego jako stosunek zawartości wody w dowolnym punkcie zlewni w stosunku do zawartości wody w poziomie bazowym, zlokalizowanym na wierzchowinie zlewni, przeprowadzonych według modelu zaproponowanego przez Svetlitchnyi i in. Uzyskane wyniki porównano z wynikami oznaczeń empirycznych, przeprowadzonych w różnych warunkach wilgotności gleby. Rozkład przestrzenny wilgotności gleby opracowano metodą krigingu na podstawie pomiarów objętościowej zawartości wody wyznaczonej za pomocą urządzenia TDR HH2 przeprowadzonych w trzech okresach o AMC (Antedescent Moisture Conditions). Badania przeprowadzono w zlewni potoku Mątny, o powierzchni 1,47 km₂ położonej w na granicy Gorców i Beskidu Wyspowego. Analiza porównawcza pokazała dość słabe dopasowanie modelu do danych eksperymentalnych uzyskanych dla badanej zlewni. Model zaproponowany przez Svetlitchnyi i in. wymaga analizy wpływu innych czynników na kształtowanie się tego współczynnika na obszarze zlewni.
In the work presentsd results of investigations of wetness coefficient defined as ratio of water content in an any point of a basin to comparative point located on the Surface of a basin, carried out according to model proposed by Svetlitchnyi et al. (2003). The obtained research results were compared with the empirical ones carried out during various soil humidity periods AMC (Antedescent Moisture Conditions). Investigations were carried out in the Mątny stream basin, of area 1.47 km₂, located between Gorce and Beskid Wyspowy. Comparative analysis showed very low fitting for the experimental results. The model proposed by Svetlitchnyi et al. requires the analysis of influence of another factors oh distribution of this parameter on the area of a basin.
Źródło:: Inżynieria Ekologiczna; 2016, 50; 99-105
2081-139X
2392-0629
Pojawia się w:: Inżynieria Ekologiczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Assessing the Solar Power Plant Efficiency Degradation Resulting from Heating
Autorzy:: Lavrik, A.
Yakovleva, E.
Lеskov, A.
Powiązania:: https://bibliotekanauki.pl/articles/124651.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: photoelectric module
PEM
solar power plant
performance coefficient
heating
cooling
Opis:: Renewable power sources (RPS) play an ever growing role in power production. With the green power cost decreasing, the RPS share (including hydro power plants) in power production grows fast. Using RPS in supplying power to various facilities reduces the CO₂ emission into atmosphere, thus reducing the greenhouse effect and being a fundamental factor in fighting the global warming. Every type of RPS possesses certain drawbacks that need to be eliminated. RPS units do have disadvantages, too, including low efficiency coefficient, and low specific power. However, there is the need for specific technological conditions. The present work describes the issue of photoelectric module heating. Photoelectric module heating results in both lower output voltage and module aging acceleration. The present work offers the method for assessing the practicability of development and implementation of solar power cell module active cooling systems, based on the photoelectric module daily performance schedules, drawing on statistic meteorological data collected over many years, and also it presents the brief description of various methods for cooling photoelectric modules.
Źródło:: Journal of Ecological Engineering; 2018, 19, 3; 115-119
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Litologiczne uwarunkowania zalegania pierwszego poziomu wód gruntowych w okolicach wsi Haćki na Równinie Bielskiej
Lithologic conditions of the water table logging in the area of Haćki village in the Bielska Plain
Autorzy:: Micun, K.
Powiązania:: https://bibliotekanauki.pl/articles/400806.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: poziom wód gruntowych
litologia
współczynnik filtracji
water table
lithology
permeability coefficient
Opis:: Celem badań było rozpoznanie litologicznych warunków występowania pierwszego poziomu wód gruntowych w rejonie wsi Haćki na Równinie Bielskiej. W trakcie badań wykonano pomiary poziomu wody w studniach kopanych, sondowania świdrem ręcznym do głębokości 5 m, pobrano próbki utworów wodonośnych i zbadano ich uziarnienie. W oparciu o wyniki analiz uziarnienia obliczono współczynnik filtracji. W budowie geologicznej obszaru dominują utwory pyłowe różnego pochodzenia. Takie wykształcenie utworów bezpośrednio wpływa na warunki filtracji i głębokość zwierciadła wód. W pobliżu wsi Haćki na Równinie Bielskiej wody gruntowe zalegają na głębokości od kilkudziesięciu centymetrów do 2 m w obniżeniach terenowych i maksymalnie nieco ponad 5 m na powierzchniach wyżej położonych. Na wzniesieniach stwierdzono obecność wód zawieszonych, zaobserwowano okresowe wysięki u podnóży wzniesień i skarp i jedno okresowe źródło. Utwory wodonośne stanowią piaski średnioziarniste, piaski drobnoziarniste i piaski drobnoziarniste zaglinione lub z pyłem. Skutkiem tego współczynnik filtracji ma niskie i bardzo niskie wartości. Zawierają się one w przedziale od poniżej 0,001 m· d^-1 do 3,8 m·d^-1. Powszechna obecność utworów pyłowych na badanym obszarze wpływa na ograniczoną wydajność pierwszego poziomu wód gruntowych.
The aim of the study was to examine lithological conditions of the water table in the area of Haćki village located in the Bielska Plain. The study involved the measurements of water level in dug wells, hand drill probing to a depth of 5 m, acquiring the samples of water-bearing deposits and analysing their granulation. The results of analyses allowed to calculate the permeability coefficient. The geological structure of the area is dominated by dusty deposits of various origins. Such deposits’ formation directly affects the conditions of filtration and depth of the water table. Groundwater logging near Haćki village in the Bielska Plain appears at a depth of several tens of centimeters to 2 meters in the depressions field and up a little over 5 meters in the case of higher ground surfaces. The presence of perched water was revealed on the hills, periodic leachates at the foot of the hills and scarps and one periodic spring. Water-bearing deposits are medium sands, fine sands and loamy fine sands or fine sands with silt. Consequently, the permeability coefficient is low or even very low. Its values range from 0,001 m·d^-1 to 3,8 m d^-1 (d – 24 hours). The widespread presence of dusty deposits in the area affects the limited efficiency of the water table.
Źródło:: Inżynieria Ekologiczna; 2016, 47; 10-18
2081-139X
2392-0629
Pojawia się w:: Inżynieria Ekologiczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Application of the Plackett-Burman Design on Soil Fertility Determinants
Autorzy:: Mehdaoui, Imane
El Ouadrhiri, Faiçal
Saoudi Hassani, El Mokhtar
Ben Abbou, Mohamed
Elhaji, Mounia
Akhazane, Mohamed
Taleb, Mustapha
Rais, Zakia
Powiązania:: https://bibliotekanauki.pl/articles/2202310.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: screening
factor
variable
Plackett-Burman design
coefficient of determination
Pareto chart
Opis:: In the present review article, a soil from the region of Fez-Sefrou Morocco was screened for some physicochemical characteristics using the Plackett-Burman model in order to determine the most important factors that promote its fertility. Five independent variables were selected: pH, electrical conductivity, humidity, organic matter, and C/N ratio. These variables were evaluated by statistical analysis, based on their significance, the value of the coefficient of determination and the Pareto chart. The results suggest that humidity and C/N ratio have an influence with a high level of confidence, while the other three show no significant effect on the content of nutrients in the soil. The analysis of the R2 variance value also showed that the models used for prediction were large and significant factors (p less than 0.05). Pareto chart plots for each response and its characteristics provided accurate data to select well-fitting variables for further optimization.
Źródło:: Journal of Ecological Engineering; 2022, 23, 12; 254--263
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Long-Term Retardation of Water Evaporation by Ultra-Thin Layers of Polydimethylsiloxanes in the Indoor Conditions
Autorzy:: Zhuk, Volodymyr
Rehush, Andriy
Burchenya, Sofiya
Hrytsiv, Oleh
Powiązania:: https://bibliotekanauki.pl/articles/1955471.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: evaporation
retardation
mass exchange coefficient
monolayer
polydimethylsiloxane
ultrathin layer
water balance
Opis:: Global climate change is causing water imbalances in many regions of the world to exceed evaporation over rainfall, leading to negative environmental consequences and economic losses. An effective way to reduce the water loss due to evaporation from the free surface of water bodies is the use of ultra-thin surface films of special additives. Insufficient stability and significant cost of additives based on fatty alcohols (hexadecanol, octadecanol and their mixtures) necessitate searching for new effective and more economical additives to reduce the water loss due to evaporation. A series of long-term (84 day) experimental studies of the effect of ultra-thin layers of polydimethylsiloxanes PDMS100 and PDMS-200 with a thickness of 1 μm on the rate of evaporation of water from the free surface was conducted under the indoor laboratory conditions. Both the dynamics of change in time of daily values of the effect of evaporation retardation by PDMS films, and total effect from the beginning of experiment were obtained. The maximum daily effects of evaporation retardation were obtained on the 6th day of the study; they are 39.5% for the PDMS-200 film and 32.9% for the PDMS-100 film, respectively. Linear correlations are obtained between the values of the mass transfer coefficient and the free surface temperature for water without additives, as well as for the same free surfaces with ultra-thin PDMS films. Overall integral efficiency of evaporation retardation by the PDMS-200 film with a thickness of 1 μm for 84 days was equal to 17.2%, while for the PDMS-100 film of the same thickness a reduction of evaporation by 5.7% was obtained. Due to the long-term activity, ultra-thin films of polydimethylsiloxanes, especially PDMS-200, can be a profitable alternative to the use of monolayers based on fatty alcohols.
Źródło:: Journal of Ecological Engineering; 2021, 22, 8; 33-40
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Analysis of hydrothermal conditions and their impact on early potato yields
Autorzy:: Radzka, E.
Rymuza, K.
Lenartowicz, T.
Powiązania:: https://bibliotekanauki.pl/articles/123670.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: Sielianinow’s coefficient
growing season
east-central Poland
yield
early potato
Opis:: The work is based on data on monthly air temperatures, monthly sums of atmospheric precipitation and early potato yields in 2000–2013 obtained from seven COBORU (Research Centre for Cultivar Testing) stations situated in east-central Poland. Hydrothermal conditions during the growing season (April–July) of early potato were described by means of the Sielianinow’s coefficient. The relationships between potato yields and the Sielianinow’s hydrothermal coefficient of the growing season were examined using multiple regression equations generated by means of the step-wise regression procedure followed by polynomial regression procedure. The average Sielianinow’s coefficient values ranged from 1.43 in April to 1.66 in May during the early potato growing season in east-central Poland. The applied statistical methods revealed that the hydrothermal factors impacted on early potato yields, particularly in the second stage of potato growth and development.
Źródło:: Journal of Ecological Engineering; 2015, 16, 2; 120-124
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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