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Wyświetlanie 1-15 z 20535
Tytuł:
Field assessment of surge and continuous furrow irrigation methods in relation to tillage systems
Autorzy:
A. Mattar, Mohamed
A. El-Saadawy, Mohamed
A. Helmy, Mamdouh
M. Sorour, Hussien
Powiązania:
https://bibliotekanauki.pl/articles/973177.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
irrigation
ploughing system
water application
efficiency
distribution uniformity
advance rate
Opis:
Surge flow irrigation is one of the irrigation techniques for controlling furrow irrigation. The aim of this study was to investigate the effect of surge furrow irrigation on water management compared with continuous irrigation for different tillage systems. An experimental field was treated with various tillage systems (mouldboard plough, chisel plough and rotary plough) and water irrigation application methods (continuous flow, control) in which irrigation water was applied continuously, and surge flow (3-surges, 4-surges and 5-surges) in which irrigation water was applied intermittently until it reached the tail end of the furrow. The results showed that water savings obtained using the surge technique were 18.58, 11.84 and 18.93% lower water use than with continuous flow, for the mouldboard, chisel and rotary ploughs, respectively. The 3-surges treatment with the rotary plough reduced the advance time by 25.36% from that for continuous irrigation. The 4-surges treatment with the mouldboard plough had the highest water application efficiency (88.13%). The 3-surges treatment with the rotary plough had the highest distribution uniformity (85.01%). The rotary plough did not cause as much soil aeration around the root system as the other tillage systems. The field research provided information about surge flow, aimed at reducing advance times and increasing irrigation efficiency.
Źródło:
International Agrophysics; 2017, 31, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure silica leached by NaOH from semi-burned rice husk ash for moisture adsorbent
Autorzy:
A’yuni, D.Q.
Subagio, A.
Hadiyanto, H.
Kumoro, A.C.
Djaeni, M.
Powiązania:
https://bibliotekanauki.pl/articles/2175795.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
microstructure
moisture absorption
silica
rice husk ash
mikrostruktura
absorpcja wilgoci
krzemionka
popiół z łusek ryżu
Opis:
Purpose: This work aims to study the water vapor adsorption property of fine silica particles from semi-burned rice husk ash. The semi-burned rice husk ash is selected as the raw material since it contains high silica and is easily found as a by-product of pottery furnace combustion. Design/methodology/approach: The silica adsorbent from semi-burned rice husk ash was prepared through a sol-gel method using various NaOH concentrations. In doing so, the different pH precipitation was also observed. Here, the fine silica powder was obtained by pulverizing dry sol-gel. The product characterizations were conducted based on water adsorption capacity at different air relative humidity. Findings: The results show no significant effects of different treatments in the extraction and gelation process. The fine silica particles exhibit large porous surfaces with agglomerated nano-sized particles that formed pores. This porous structure is related to the distributions of pore size of each sample, which mostly obey the mesoporous characteristics. From sorption isotherm, weak adsorbent-adsorbate bonding was observed and demonstrated multilayer adsorption of mesoporous materials. Research limitations/implications: The study of water adsorption was carried out at room temperature, which can change at any time, even though has no significant effect on the humidity. However, it is needed to study the adsorption in an incubated area to receive a constant temperature. Practical implications: The products namely silica prepared from semi-burned rice husk ash show a high moisture uptake, especially at a high relative humidity region. This property can be comparable with the other silica preparation methods. So, this product can be a highly potential adsorbent for air or gas dehumidification systems. Originality/value: The silica-based semi-burned rice husk ash as a water adsorbent is more sustainable than commercial silica. This is a positive contribution to find a potentially develop water vapor adsorbent with good adsorption capacity. Besides, the synthesis process is a simple and low-cost process.
Źródło:
Archives of Materials Science and Engineering; 2021, 108, 1; 5--15
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Laser Pulse Energy on the Optical Properties of Cu₂O Films by Pulsed Laser Deposition
Autorzy:
Aadim, K.
Hussain, A.
Abdulameer, M.
Powiązania:
https://bibliotekanauki.pl/articles/1401906.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Fg
Opis:
In this work copper oxide films (Cu₂O) were grown by pulsed laser deposition. The films were analyzed by X-ray diffraction and their thickness by using profilometer while the UV-VIS absorption spectra were recorded by using UV-VIS spectrometer. Pulsed Nd:YAG laser was used with varying its pulse energy, with distance between target and substrate 1 cm, and substrate temperature at room temperature, vacuum pressure was fixed at 6×10¯² mbar, number of pulses = 1000. The optical properties of as-grown film like energy gap has been measured experimentally and the effects of laser pulse energy on it were studied. There is linear relation between energy gap and pulse energy. The specific energy gap of Cu₂O film can be controlled by changing laser pulse energy and fixing other pulsed laser deposition parameter such as substrate temperature, distance between target and substrate, background pressure and number of pulses.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 419-422
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of an Ergonomic Intervention on Musculoskeletal, Psychosocial and Visual Strain of VDT Data Entry Work: The Norwegian Part of the International Study
Autorzy:
Aaras, A.
Horgen, G.
Ro, O.
Loken, E.
Mathiasen, G.
Bjorset, H. H.
Larsen, S.
Thoresen, M.
Powiązania:
https://bibliotekanauki.pl/articles/89686.pdf
Data publikacji:
2005
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
musculoskeletal
visual discomfort
psychosocial stress
choroby narządów ruchu
ergonomia
warunki pracy
praca biurowa
współpraca międzynarodowa
komputer
bazy danych
stres
zagrożenie zdrowia
Opis:
The Norwegian MEPS (musculoskeletal-eyestrain-psychosocial-stress) study included 3 groups: data entry, data dialogue (female) and data dialogue (male). Before intervention, the data entry group reported significantly more symptoms and signs of musculoskeletal illness and had longer periods in front of the video display terminal (VDT) without a break. The ergonomic intervention consisted mainly of ergonomic information and training. After intervention, the data dialogue female group reported a significant reduction in shoulder pain in parallel with a reduction in trapezius load. Increasing the understanding in how to adjust the work stand and chair may have been contributing factors to reducing the pain level. There was a significant reduction in eye problems in all groups; the greatest reduction in eye symptoms was seen in the groups who had new optometric corrections.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2005, 11, 1; 25-47
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Depressive episodes and depressive tendencies among a sample of adults in Kielce, south-eastern Poland
Autorzy:
Aaro, L.E.
Herbec, A.
Bjorngaard, J.H.
Manczuk, M.
Zatonski, W.A.
Powiązania:
https://bibliotekanauki.pl/articles/51028.pdf
Data publikacji:
2011
Wydawca:
Instytut Medycyny Wsi
Tematy:
human disease
depressive episode
depressive tendency
adult
Kielce town
Polska
urban population
rural population
Źródło:
Annals of Agricultural and Environmental Medicine; 2011, 18, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The clinical course of urolithiasis in children under 3 years of age
Autorzy:
Aaslid, A.
Tkaczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1916302.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
urolithiasis
pediatrics
treatment
risk factors
Opis:
Purpose: Certain risk factors of urolithiasis may be diagnosed in 75% of children with stones. They include genetic, anatomic, metabolic and nutrition causes. The diagnostics' evaluation should determine and rule out anatomic factors and establish metabolic disorders. The treatment is based on an increased fluid intake, and alterations in the nutrition pattern. The aim was to analyze the clinical course of urolithiasis in children below 3, and detect the possible factors affecting the success of therapy. Materials and methods: Between 2009 and 2013, we retrospectively investigated the cases of 68 children (34 boys and 34 girls) under 3 years who were treated in the clinic. Urolithiasis was diagnosed at the mean age of 10 months; the average follow-up lasted 26 months until reaching 3 years. The retrospective analysis was based on medical documentation and direct contact with parents. Results: Among the risk factors, the most common was hyperciuria. The treatment of children was based on an increased daily fluid intake and dietary recommendations. Among the specific treatments, the most common were citrates (51%). In the majority of cases, the therapy lasted over a year after the clinical absence of stones. This therapy was successful in 62% of children. The factors contributing to the success of the treatment were: a negative family history of urolithiasis, unilateral stones, normal urinalysis, decrease of the Ca/Cr index, and compliance of dietary and medical recommendations. Conclusions: The treatment is based on the elimination of risk factors, and alterations in the dietary pattern. High percentage of parents did not respect the medical recommendations.
Źródło:
Progress in Health Sciences; 2014, 4, 1; 68-74
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, computational, anticancerous and antiproliferative effects of some copper, manganese and zinc complexes with ligands derived from symmetrical 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl-salicylaldehyde
Autorzy:
Ababneh, Taher S.
El-Khateeb, Mohammad
Tanash, Aissar K.
AL-Shboul, Tareq M.A.
Shammout, Mohammad Jamal A.
Jazzazi, Taghreed M.A.
Alomari, Mohammad
Daoud, Safa
Talib, Wamidh H.
Powiązania:
https://bibliotekanauki.pl/articles/1849324.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
tetradentate schiff base
symmetrical metal complexes
DFT calculation
spectroscopy
anticancerous
antiproliferative
Opis:
Four new symmetrical Schiff bases derived from 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl-salicylaldehyde have been synthesized and characterized by elemental analysis and different spectroscopic techniques. The reaction of 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl with two equivalents of 5-tert-butyl-, 3,5-dinitro-, 3,5-dibromo- and 3-tert-butyl-salicylaldehyde yielded 2,2’-bis(5-tert-butyl-salicylideneamino)-4,4’-dimethyl-1,1’-biphenyl (A1) as well as the 3,5-dinitro- (A2), 3,5-dibromo- (A3) and 3-tert-butyl- (A4) substituted derivatives. The tetradentate ligands were then reacted with copper-, manganese- and zinc-acetate producing the tetra-coordinate metal complexes which were characterized by FTIR, UV-Visible spectroscopy, magnetic susceptibility and elemental analysis. Zinc complexes were characterized by 1H-NMR spectroscopy. Density functional theory (DFT) calculations at the B3LYP/6-31G(d) level of theory were carried out to fully optimize and examine the molecular geometries of complexes. Subsequently, IR vibrational and UV-Vis absorption spectra were computed and correlated with the observed values and the results are in good agreement with the experimental data. The anticancerous and antiproliferative activity of the A3 ligand and its metal complexes were determined.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 1; 7-15
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Excimer Laser Irradiation Effects on Properties of Crystalline YBaCuO Thin Films
Autorzy:
Abal'oshev, A.
Abal'osheva, I.
Lewandowski, S. J.
van der Beek, C. J.
Konczykowski, M.
Rizza, G.
Barbanera, S.
Powiązania:
https://bibliotekanauki.pl/articles/2038396.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Fy
74.72.Bk
74.78.Bz
81.15.Fg
Opis:
The influence of UV laser irradiation on the physical properties of epitaxial YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ thin (<1μm) films fabricated by laser ablation was studied. The samples were irradiated by pulsed excimer laser beam at different incident energy densities E$\text{}_{ir}$≤130 mJ/cm$\text{}^{2}$, i.e. 2-3 times below the ablation threshold of YBaCuO. The analysis of the sample cross-section using transmission electron microscope shows that such irradiation forms a disordered layer on the top of the crystalline film. Sample surface amorphization was observed also by atomic force microscope. Due to strong UV irradiation absorption in YBaCuO this surface layer acts like a protective cover for the sample interior. Only a small reduction of superconducting critical temperature T$\text{}_{c}$ was observed. Both transport measurements in normal state and magneto-optical studies in superconducting state indicate that between the disordered layer and the bottom non-modified part of the film there exists a wide transitional region with reduced carrier concentration.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 681-685
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20535

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