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Tytuł:
Effect of Annealing Treatment on (Mg17Al12) Phase Characterization and Corrosion Behavior in Different Solutions for AZ91 Alloy
Autorzy:
Abass, Marwa H.
Abdulkareem, Makarim H.
Hussein, Hussien A.
Powiązania:
https://bibliotekanauki.pl/articles/2201907.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
AZ91
alloy
heat treatment
corrosion
microstructure
antibacterial
hardness
Opis:
Heat treatment is the most suitable technique for altering the microstructure and, consequently, it is possible to create the optimal balance of corrosion resistance and mechanical strength in a material by carefully regulating the conditions during the heating process. The present work aims to investigate the effect of heat treatments (annealing) at (300°C) at different times (10, 20, and 30 hr) on the magnesium alloy. How the Mg17Al12 phase influences the corrosion behavior of AZ91D magnesium alloy was quantified in different solution (SBF, Lactic and Ringer). It was able to construct an extensive range of Mg17Al12 phase volume fractions by varying the annealing period. The corrosion potential of many specimens with varied proportions of the Mg17Al12 phase was evaluated. The results of the conducted tests manifested that the material's resistance to corrosion greatly improved with an increase in the volume fraction of Mg17Al12 phase. The effect of heat treatment on the microstructure was analyzed using transmission electron microscopy and X-ray diffraction. The SEM photographs evinced that the amount of β-Mg17Al12 phase decreased significantly, with the distribution occurring at the grain boundaries and with increasing the time of annealing, resulting in a highly saturated α-grain. The XRD validated the all material peaks of phases that are present. The corrosion test behavior of AZ91 alloy in the simulated body fluid (SBF), lactic, and Ringer solutions was investigated through electrochemical measurements, the result was elucidated as measured along the Tafel slope, and the corrosion current density of all heat treated samples was lower than that of the as-cast sample. The measurement of hardness (HV) demonstrated that the hardness decreased to (64.5 HV0.5) during the heat treatment. The result antibacterial efficiency was revealed that AZ91 at 30 hr was best then as cast against the bacteria E.coli.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 2; 330--341
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fretting wear analysis of different tube materials used in heat exchanger tube bundle
Autorzy:
Abbas, T.
Khushnood, S.
Nizam, L. A.
Usman, M.
Powiązania:
https://bibliotekanauki.pl/articles/957958.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
fretting wear
flow-induced vibration
flexible tube
cross flow velocity
Opis:
Research on heat exchange has been carried out for more than five decades because of its importance in process industries and power generation plants. Heat exchanger experiencing cross flow are vulnerable to flow-induced vibration. This vibration causes the interaction of tubes with the baffle resulting in a fretting wear of the tubes. The present study focuses on fretting wear analysis of different tube materials. Fretting wear tests were performed on aluminum, copper and stainless steel instrumented central tubes against mild steel baffle. For each tube material the tests were performed for three different test durations i.e. 60 minutes, 120 minutes and 180 minutes at a cross flow velocity of 0.55 m/s. It was observed that vibrational amplitude of the flexible test tube is affected by its weight. A scanning electron microscope was used to analyze and measure the sizes of wear scar. The results indicated that wear loss in case of aluminum tube is the highest while that in case of stainless steel tube is the lowest.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 123-133
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power and thrust coefficients of the horizontal axis tidal stream turbine with different twist angles, blade numbers, and section profiles
Autorzy:
Abbasi, Alireza
Ghassemi, Hassan
Molyneux, David
Powiązania:
https://bibliotekanauki.pl/articles/135026.pdf
Data publikacji:
2019
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
HATST
twist angle
blade profile
blade number
power coefficient
thrust coefficients
Opis:
The purpose of this research was to investigate the power and thrust coefficients of a horizontal axis tidal stream turbine (HATST) with different blade geometries, including twist angles, blade numbers, and section profiles. The RANS equations and Star-CCM+ commercial software were used to numerically analyze these variables. Furthermore, the turbulence model used in this study is a Realisable k-ε turbulent model. Nine different models were defined by changing the twist angle, thickness, camber, and blade numbers. The results are presented, and the power and thrust coefficients are compared against TSR for each of the nine different models. The pressure distribution and flow velocity contour are also presented and discussed.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2019, 57 (129); 11-20
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation on the vibration reduction of rotating shaft using different groove shapes of tilt bearing
Autorzy:
Abbood, Ahmed Imad
Abdulla, Fadhel Abbas
Powiązania:
https://bibliotekanauki.pl/articles/2203648.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
tilt bearings
bearing groove
rotor system
ANSYS transient
fluent
vibration reduction
finite elements
układ wirnikowy
ANSYS
redukcja drgań
badanie numeryczne
łożysko
Opis:
Vibration control is very important for high-speed rotors. Oil film damping is considered an effective vibration-damping method, especially for long shafts in gas turbines, ships, and other high-speed rotating equipment. The existing groove in the internal surface of the tilt bearing increases the amount of oil that flows through the bearing; this is more effective in suppressing the vibration of the rotor system carried by the plain bearing. In order to suppress the vibration of the rotor system, which is supported by sliding bearings, a different groove-shaped oil flow (GSOF) is studied and analysed in this paper. A different shape of grooves in bearings was set up and measured to study the vibration-damping effect of the flow oil shape with GSOF. ANSYS software presents significant benefits to engage Fluent for oil flow with Transient structural for vibration measurements. This paper uses these terms to perform the simulation numerically to explore the groove-shaped damper's damping effect under the rotor system. The study identified three enhancements of vibration and settling time. First, the circular groove showed a 35.71% reduction in amplitude and 10% increase in stilling time; the next one is the circular groove which reduced the amplitude by 42.85% and the settling time by 0%. The third modification was the inclined groove which reduced the amplitude by 42.85% and the settling time by 12%. The last one was the triple-inclined groove, which reduced the amplitude and settling time by 57.14% and 20%, respectively.
Źródło:
Diagnostyka; 2023, 24, 3; art. no. 2023304
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on the structural, optical and topographical behavior of Cadmium oxide polycrystalline thin films using electrochemical depositing method at different times
Autorzy:
Abd, Ahmed N.
Dawood, Mohammed O.
Hassoni, Majid H.
Hussein, Ali A.
Powiązania:
https://bibliotekanauki.pl/articles/1192094.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cadmium oxide
thin film
optical characteristics of film
electrochemical depositing method
Opis:
The optical and structure properties of Cadmium oxide (CdO) thin film prepared by electrochemical deposition method at different times (15, 30 and 60) min were investigated in this paper. Results of optical Transmission, absorption, reflection spectra, optical conductance, refractive index, extension coefficient, real and imaginary dielectric constants studies are reported. The optical transmittance of the CdO thin film which formed at room temperature was 20% at wavelength ≈350 nm then increases to 60% at wavelength ≈1100 nm for thin film of CdO. The band-gap was also calculated from the equation relating absorption coefficient with the wavelength. The energy band gap changes from 2.3eV (Bulk CdO) to 2.45eV (CdO thin film). The plotted graphs show the optical characteristics of the film which varied with the wavelength and the photon energy. The optical conductance and band-gap indicated that the film is transmitting within the visible range. The dielectric constant and optical conductance of the film initially decreases slowly with increase in photon energy. The extinction coefficient and refractive index of the films also evaluated, which affected with the change in transmittance. The structure of synthesised CdO thin film was analyzed by X-ray diffraction XRD which revealed that the CdO thin film are polycrystalline and have several peaks of cubic face structure. The crystallite size, dislocation density, microstrain and number of dislocations of the thin film were calculated and listed.
Źródło:
World Scientific News; 2016, 37; 249-264
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Briquetting of Rosetta ilmenite ore with different organic binder and its reduction in hydrogen in the temperature range of 800-1200 degrees of Celsius
Brykietowanie rudy ilmenitowej z Rosetta przy użyciu różnego organicznego lepiszcza redukowanego w atmosferze wodoru w zakresie temp. 800-1200 stopni Celsjusza
Autorzy:
Abd el-Gawad, H. H.
El-Hussiny, N. A.
Wassf, M. A.
Kalifa, M. G.
Iskander, B. A.
Shalabi, M. E. H.
Powiązania:
https://bibliotekanauki.pl/articles/349661.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
kinetyka redukcji
brykiety
redukcja w środowisku wodorowym
ilmenite
reduction kinetics
briquetting
reduction by hydrogen
Opis:
Fine grained ilmenite ore was briquetted with different amounts of molasses or pitch and pressed under different values of pressure was studied in this investigation. The results show that optimal amount of added molasses and pitch were 1.5%, the pressure was fixed to 294.3 MPa. Furthermore, the characteristics of raw materials was examined by different methods of analysis, such as x-ray and screen analysis. The produced briquettes were then reduced by different amounts of hydrogen by different temperatures and the reduction kinetics was determined.
Drobno uziarniona ruda ilmenitu, brykietowana z różnymi ilościami melasy lub smoły pod różnym ciśnieniem, była przedmiotem badań w tym artykule. Wyniki wykazały, że optymalną ilością dodawanego lepiszcza było 1,5%, przy ciśnieniu 294,3 MPa. Ponadto, badano różnymi metodami, tj. promienie X oraz analiza sitowa, charakterystyki materiałów. Produkowane brykiety były redukowane przy udziale różnych ilości wodoru przy zmiennych wartościach temperatury. Kinetyka redukcji została określona.
Źródło:
Górnictwo i Geoinżynieria; 2009, 33, 4; 25-40
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lung Cancer Risk Due to Radon in Different Brand Cigarette Tobacco in Iraqi Market
Autorzy:
Abdalsattar, Kareem Hashim
Ahmed Najam, Ahmed Najam
Abbas, Fadhel Hadi
Fadhil, Khaddam fuliful
Powiązania:
https://bibliotekanauki.pl/articles/1178355.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CR-39
Radon
effective dose
lung cancer
nuclear track detectors
tobacco
Opis:
Sealed can technique using CR-39 plastic track detector strippable has been used in order to measure radon concentrations to calculate the annual effective dose and lung cancer cases per year per million person for twenty different brand tobacco cigarette were collected from Iraqi market. Lung cancer is the leading cause of cancer-related deaths worldwide. Radon exposure is the second leading cause of lung cancer, following tobacco smoke. Radon is not only an independent risk factor; it also increases the risk of lung cancer in smokers. It has been observed that tobacco smoking increases the risks of radon-induced lung cancer. Radon and cigarette smoking have synergistic, multiplicative effect on lung cancer rates. People who inhale tobacco smoke are exposed to higher concentrations of radioactivity. Ever since studies on the relation of smoking to cancer, particularly the lung cancer has been established, there had been a great interest in studies concerned with the monitoring of the alpha radioactivity in tobacco. The results showed that the 222Rn concentrations in cigarette tobacco samples ranged from (156.450 to 403.087) Bq/m3 with an average 284.751 Bq/m3, while the radon induced lung cancer risks was found to vary from 71.047 to 183.049 with an av¬erage value of 129.3107 per million person, and standard deviation 83.529 and 37.932, respectively. Excellent correlation has been observed between radon concentration and lung cancer cases per year per million person for different brand tobacco cigarettes.
Źródło:
World Scientific News; 2017, 77, 2; 163-176
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Different Copper Salts on the Mechanical and Ballistic Characteristics of Double Base Rocket Propellants
Autorzy:
Abdel-Ghani, N.
Elbeih, A.
Helal, F.
Powiązania:
https://bibliotekanauki.pl/articles/357974.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
double base rocket propellant
burning rate modifiers
ballistic performance
mechanical properties
Opis:
This paper discusses the enhancement in the ballistic performance of double base rocket propellants (DBRPs) by the addition of different copper salts vs lead salts as burning rate modifiers through stable combustion and the formation of a plateau region in the low pressure region. Compositions based on DBRPs containing different percentages of lead stearate and different types of copper salts were prepared and studied. For comparison, a conventional DBRP was studied. The ignition temperature and heat of combustion were determined experimentally, and the mechanical properties were measured and evaluated. The performance in terms of ballistic characteristics (burning rate, operating pressure) were measured at different throat diameters (8, 8.5, 9, 9.5 mm) and at different temperatures (−20 and 50 °C). Specific impulses were calculated using the ICT thermodynamic code. The experimental data from the proportional study indicate that the compositions containing the studied burning rate modifiers are superior to the original DBRP in respect of ballistic performance and mechanical properties.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 2; 469-482
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fusaria and other fungi taxa associated with rhizosphere and rhizoplane of lentil and sesame at different growth stages
Autorzy:
Abdel-Hafez, S.I.I.
Ismail, M.A.
Hussein, N.A.
Abdel-Hameed, N.A.
Powiązania:
https://bibliotekanauki.pl/articles/67219.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Fusarium
fungi
rhizosphere
rhizoplane
lentil
sesame
growth stage
Lens culinaris
Sesamum indicum
Opis:
Density and diversity of Fusarium species and other fungi associated with rhizosphere and rhizoplane of lentil and sesame plants at three different growth stages were investigated. Sixteen species of Fusarium were isolated from rhizosphere (13 species) and rhizoplane (11) of both plants studied. In lentil, 11 species were recorded from its rhizosphere (9 species) and rhizoplane (8). Fusarium species associated with lentil rhizoplane gave highest number of propagules at the first stage of plant growth while the ones of Fusarium associated with the rhizosphere produced the highest number at the second stage of growth. F. solani was the most common in the three growth stages. In addition, of two growth stages, F. culmorum and F. tricinctum were isolated from the rhizosphere while F. nygamai and F. verticillioides from the rhizoplane. The other species were recorded from only one growth stage of lentil plant. In sesame plants, rhizosphere yielded nine Fusarium species while rhizoplane gave only six from the three stages investigated. Stage I of sesame rhizosphere possessed the highest colony forming units of Fusarium. As the case for lentil, F. solani was the most common species in sesame rhizospere and rhizoplane. F. verticillioides and F. nygamai (in three different growth stages) followed by F. oxysporum and F. tricinctum (in two growth stages) were recorded using the dilution-plate and/or soil-plate methods from sesame rhizosphere soils. Rhizoplane Fusarium species of sesame plants were isolated at the three different growth stages with almost equal number of colony forming units. F. poae came after F. solani in its frequency since it was recovered from two growth stages. Several of the isolated species are well-known as pathogens to many cultivated plants. To the best of our knowledge, three species are recorded here for the first time in Egypt from the rhizosphere (F. acutatum), rhizoplane of sesame plants (F. longipes) and from rhizosphere of both lentil and sesame and rhizoplane of lentil (F. nygamai).
Źródło:
Acta Mycologica; 2012, 47, 1
0001-625X
2353-074X
Pojawia się w:
Acta Mycologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of the Different Moulding Parameters on Properties of the Green Sand Mould
Autorzy:
Abdulamer, Dheya
Powiązania:
https://bibliotekanauki.pl/articles/27314147.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
green sand
compactability
tensile strength
permeability
Taguchi method
masa formierska
zagęszczalność
wytrzymałość na rozciąganie
przepuszczalność
Metoda Taguchiego
Opis:
Sand Casting process depends mainly on properties of the green sand mould, sand casting requires producing green sand mould without failure and breakage during separation the mould from the model, transportation and handling. Production of the green sand mould corresponding to dimensions and form of the desired model without troubles depends on the properties of the green sand. Ratio of constituents, preparation method of the green sand, mixing and pressing processes determine properties of green sand. In the present work, study effect of the moulding parameters of bentonite content, mixing time, and compactability percentage on the properties of the green sand mould have been investigated. Design of experiments through Taguchi method was used to evaluate properties of permeability, compressive strength, and tensile strength of the green sand. It was found that 47% of compactability, 9(min) of mixing time, and 6% of bentonite content gives highest values of these properties simultaneously.
Źródło:
Archives of Foundry Engineering; 2023, 23, 2; 5--9
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Hardness Prediction Model of Turning Duplex Stainless Steel under Different Cutting Variables
Autorzy:
Abdulateef, Osamah Fadhil
Ali, Abduljabar H.
Al Kareem, Salah Sabeeh Abed
Powiązania:
https://bibliotekanauki.pl/articles/2201899.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
CNC turning
orthogonal array
ANN
signal-to-noise ratio
Opis:
The quality of machine components surfaces plays an important impact on their functional performance. Product performance may be restricted by changes to surface integrity, which includes changes to roughness, hardness, and microstructure. In this research, the impact of cutting variables in CNC turning under the conventional cooling condition on surface hardness of Duplex Stainless Steel. Cutting variables under conventional cooling, including cutting speed, feed, and depth of cut, have been optimized utilizing Taguchi’s L9 orthogonal array designed with three stages of turning variables. The optimal variable stages and the degree of significance of the cutting variables, respectively, were determined utilizing the analysis of means (ANOM) and analysis of variance (ANOVA). Effectiveness tests with optimum stages of variables were done to prove the viability of optimization by utilizing Taguchi. It has been found that the maximum surface hardness is most strongly affected by the feed 71.29%, followed by the depth of cut 12.1%, and finally the cutting speed 11.61%.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 1; 1--7
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of calcium sulfoaluminate additive on linear deformation at different humidity and strength of cement mortars
Autorzy:
Abdulwahid Al-Musawi, Kadhim
Bindhu Abraham, Kottayil
Potses, Tatsiana
Leonovich, Sergey
Kalinouskaya, Natallia
Beulah, M.
Budrevich, Neli
Powiązania:
https://bibliotekanauki.pl/articles/110953.pdf
Data publikacji:
2020
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
shrinkage
cracks
calcium sulfoaluminate additives
expanding additives
Opis:
The effect of calcium sulfoaluminate additives (CSA) on the compression and bending strength of mortar, as well as linear deformation of prism samples at different environmental humidity was studied. Test results indicate that bending strength of mortars with CSA and the referent at the age of 28 days are practically equal. Compressive strength of mortars with CSA reduced by 20 ... 23% for all dosages of CSA. Relative linear deformations depend on the humidity of the environment. At a humidity of 100%, the relative linear deformations are positive and the expansion increases with increasing dosage of the expanding additive. When hardening in dry air at a humidity of 55%, the greatest shrinkage deformations were for mortars with CSA. We can conclude that the expanding effect of CSA is fully manifested at high humidity, i.e. under construction conditions, this means very high-quality moisture care for concrete structures.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2020, 2; 1-9
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of sterile wild oat (Avena sterilis L.) resistance to acetolactate synthase (ALS)-inhibiting herbicides using different assay techniques
Autorzy:
Abdurruhman, A.M.
Uygur, S.
Mathiassen, S.K.
Uygur, N.
Powiązania:
https://bibliotekanauki.pl/articles/2082753.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acetolactate synthase
agar-based assay
Avena sterilis
Petri-dish assay
whole-plant assay
Opis:
Different techniques have been devised to detect herbicide resistance in weeds, and the over- all aim from this study was to compare four different assay techniques for evaluating acetol- actate synthase (ALS)-inhibiting herbicide resistance in sterile wild oat (Avena sterilis L.). A resistant sterile wild oat population (R) was collected from the wheat field in Kozan, Adana province, Turkey. The susceptible (S) population was collected from the border of the same field. Effects of different doses of mesosulfuron-methyl + iodosulfuron-methyl- -sodium and pyroxsulam + cloquintocet-mexyl were assessed in agar based (seed and seed- ling) assay, Petri dish with seeds, and whole plant pot assay. In the agar based assays, the level of resistance was evaluated by measuring coleoptile and hypocotyl lengths, and sur- vival of seedlings. Plant height and shoot dry weight were measured in the Petri dish and whole plant pot assays, respectively. Results from the dose response analyses showed that both the R and S populations were extremely sensitive to mesosulfuron-methyl + iodosul- furon in the seedling bioassay. The resistance indices (RI’s) of the R biotype treated with mesosulfuron-methyl + iodosulfuron in the agar based seed, Petri dish, and whole plant assays were 2.29, 2.63 and 4.18, respectively. The resistance indices of the R biotype treated with pyroxsulam + cloquintocet-mexyl was 3.41, 5.05 and 2.82 in the agar based seed, Petri dish, and whole plant pot assays, respectively. The agar based seed assays and Petri dish as- say provided feasible, accurate, rapid, and cost effective opportunities to identify resistance in sterile wild oat.
Źródło:
Journal of Plant Protection Research; 2020, 60, 3; 244-252
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wheat water use and yield under different salinity of irrigation water
Zużycie wody i plon pszenicy w warunkach różnego zasolenia wody stosowanej do nawodnień
Autorzy:
Abedinpour, M.
Powiązania:
https://bibliotekanauki.pl/articles/292283.pdf
Data publikacji:
2017
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
crop coefficient
saline water
stress
wheat crop
stres
uprawa pszenicy
woda słona
współczynnik roślinny
Opis:
A field experiment was conducted for determination of crop coefficient (KC) and water stress coefficient (Ks) for wheat crop under different salinity levels, during 2015–2016. Complete randomized block design of five treatments were considered, i.e., 0.51 dS∙m–1 (fresh water, FW) as a control treatment and other four saline water treatments (4, 6, 8 and 10 dS∙m–1), for S1, S2, S3 and S4 with three replications. The results revealed that the water consumed by plants during the different crop growth stages follows the order of FW > S1 > S2 > S3 > S4 salinity levels. According to the obtained results, the calculated values of KC significantly differed from values released by FAO paper No 56 for the crops. The Ks values clearly differ from one stage to another because the salt accumulation in the root zone causes to reduction of total soil water potential (Ψt), therefore, the average values of water stress coefficient (Ks) follows this order; FW(1.0) = S1(1.0) > S2(1.0) > S3(0.93) > S4(0.82). Precise data of crop coefficient, which is required for regional scale irrigation management is lacking in developing countries. Thus, the estimated values of crop coefficient under different variables are essential to achieve the best management practice (BMP) in agriculture.
W latach 2015–2016 przeprowadzono polowy eksperyment w celu określenia współczynnika roślinnego (KC) i współczynnika stresu (Ks) dla pszenicy nawadnianej wodą o różnym zasoleniu. Eksperyment przeprowadzono metodą bloków losowych w pięciu wariantach zasolenia: 0,51 dS∙m–1 (woda słodka FW jako kontrola) oraz 4, 6, 8 i 10 dS∙m–1 odpowiednio dla wariantów S1, S2, S3 i S4, każdy w trzech powtórzeniach. Wyniki wskazują, że woda pobierana przez rośliny w różnych stadiach ich rozwoju układała się w malejącym porządku zasolenia FW > S1 > S2 > S3 > S4. Obliczone wartości współczynnika KC różniły się istotnie od wartości podanych dla upraw w biuletynie FAO nr 56. Wartości Ks różniły się znacząco między poszczególnymi stadiami, ponieważ kumulacja soli w strefie korzeniowej ograniczyła całkowity potencjał wody glebowej (Ψt). Z tego powodu średnie wartości współczynnika stresu (Ks) malały w porządku FW(1,0) = S1(1,0) > S2(1,0) > S3(0,93) > S4(0,82). W krajach rozwijających się brakuje dokładnych danych o współczynniku roślinnym, które są niezbędne w regionalnym zarządzaniu wodą do nawodnień. Dlatego wartości współczynnika oznaczone w różnych wariantach zasolenia są istotne dla osiągnięcia najlepszych praktyk w gospodarce rolnej.
Źródło:
Journal of Water and Land Development; 2017, 33; 3-9
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Os riscos do silenciamento: Diferentes perspectivas nos processos de tomada de decisão na elaboração de políticas públicas de memória no contexto da redemocratização brasileira
The risks of silencing: different perspectives on the decision-making processes in the establishment of public policies of memory in the context of Brazilian redemocratization
Autorzy:
Abreu Silva, Fernanda
Powiązania:
https://bibliotekanauki.pl/articles/2076270.pdf
Data publikacji:
2021-12-31
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
justiça de transição
lei de anistia
redemocratização
políticas públicas
memória
transitional justice
amnesty law
redemocratization
public policies
memory
Opis:
Trata-se de uma análise dos processos de tomada de decisão na elaboração de políticas públicas de memória executadas no Brasil entre as décadas 1990 e 2010. Considerando a Lei de Anistia como uma importante chave analítica para o processo de redemocratização do país, tendo orientado as ações de memória, verdade e justiça ao longo desse período, desenvolvemos o termo política pública de silenciamento visando compreender as negociações em torno da elaboração dessas medidas sob a convergência de três diferentes perspectivas sobre como lidar com o passado autoritário que se mantiveram em constante disputa nesse cenário.
It is an analysis of the decision-making processes in the establishment of public policies of memory achieved in Brazil between the 1990s and 2010, still in progress. Considering the Amnesty Law as an important analytical key for the re-democratization process, guiding the actions of memory, truth, and justice throughout this period, we developed the concept of public policy of silencing in order to understand the negotiations around the formulation of these measures under the convergence of three different perspectives on how to deal with the authoritarian past in a steady contest in this scenario.
Źródło:
Revista del CESLA. International Latin American Studies Review; 2021, 28; 295-310
1641-4713
Pojawia się w:
Revista del CESLA. International Latin American Studies Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 4220

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