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Tytuł:
Seed Quality and Protein Classification of Some Quinoa Varieties
Autorzy:
Abd El-Hakim, Ahmed F.
Mady, Emad
Abou Tahoun, Ayman M.
Ghaly, Mohammed S. A.
Eissa, Mohamed A.
Powiązania:
https://bibliotekanauki.pl/articles/2025743.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
quinoa
seed vigour
seed quality
amino acids composition
agro-climatic zone
Opis:
Quinoa plants, originating from the Andean mountains in South America, have a large scale of biological diversity. Along with the cultivation favorableness of quinoa, it reveals superior nutrition aspects. In comparison with cereal crops, like rice, maize, and wheat, quinoa seeds contain valuable quantities of protein of remarkable quality. The current study compared four quinoa cultivars from different origins in terms of protein composition and germinability. In addition, this study focused on the effect of different geographical cultivation areas on the protein composition of wild Egyptian quinoa seeds and three other cultivars that vary in their cultivation origins. Significant differences were observed among the quinoa varieties in the germination percentage (GP), shoot length (SL), and root length (RL). Using the technology of Near-InfraRed Spectroscopy, the highest protein value was recorded for the American variety (18.39%), followed by the Wild Egyptian variety (17.16%). The aromatic phenylalanine recorded the highest concentration of the essential amino acid bulk. The Rainbow variety contained 12.7 g-aa/kg protein, followed by the wild Egyptian variety with 4.9 g-aa/kg protein. In turn, glutamic was the most abundant amino acid of the non-essential amino acids, with 10.1, 4, 23.4, and 4 (g-aa/kg protein) for quinoa varieties, Wild Egyptian, American, Rainbow, Black, respectively. SDS-PAGE was used to identify the allelic variations in the seed storage protein profiles among the studied quinoa varieties. The studied quinoa varieties showed 23.81% of the polymorphism in the protein bands, with the mean band frequency of 0.881. The resulting protein bands fluctuated in the range between 115.02 and 16 kDa. With a similarity percentage (90%), Wild Egyptian and the Rainbow quinoa varieties can be classified in one clade.
Źródło:
Journal of Ecological Engineering; 2022, 23, 1; 24-33
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of melatonin, GA3 and NAA on vegetative growth, yield and quality of ‘Canino’ apricot fruits
Autorzy:
Abd El-Naby, S.K.M.
Abdelkhalek Ahmed Mohamed, M.
El-Naggar, Y.I.M.
Powiązania:
https://bibliotekanauki.pl/articles/12684291.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
plant cultivar
apricot
Canino cultivar
fruit tree
fruit quality
fruit yield
vegetative growth
field experiment
gibberellic acid
melatonin
plant growth regulator
naphthaleneacetic acid
titratable acidity
total soluble solid
Opis:
A field experiment was carried out during 2017–2018 in the Horticulture Research Station farm in El Kanater El Khayreia, El Kalubeia Governorate, Egypt, to find out the response of foliar application of melatonin, GA3 and NAA on vegetative and fruit attributes of ‘Canino’ apricot. Different plant growth regulators influenced all variable parameters related to vegetative growth and fruit. Results revealed that between all growth regulators, the foliar application of melatonin following by GA3 there was the highest vegetative growth as compared to other treatments, while GA3 gave the highest yield following by melatonin as compared to other treatments. Treatment with NAA improved vegetative growth, yield and fruit quality to a lesser extent as compared to the control.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 3; 167-178
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption mechanism and modelling of hydrocarbon contaminants onto rice straw activated carbons
Autorzy:
Abdel daiem, Mahmoud M.
Sánchez-Polo, Manuel
Rashed, Ahmed S.
Kamal, Nehal
Said, Noha
Powiązania:
https://bibliotekanauki.pl/articles/779863.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
activated carbon
rice straw
adsorption mechanism
adsorption modeling
pore volume surface diffusion
Opis:
The adsorption of Diphenolic acid (DPA), 2,4-Dichlorophenoxyacetic acid (2,4-D), and 2-methyl-4-chlorophenoxyacetic acid (MCPA) were examined in aqueous solution using activated carbon rice straw. The rice straw was activated by using two reagents, zinc chloride and phosphoric acid and named as RSZ, RSP, respectively. The results showed that both carbons have a relatively high adsorption capacity. Concerning the adsorption kinetic, the second-order model has better fit than the first model to experimental data. The adsorption yield of both carbons increased in the order: DPA < 2,4-D < MCPA. The pore volume diffusion model satisfactorily fitted the experiment on both carbons. Furthermore, solution pH has a high influence on the adsorption capacity for both carbons. The adsorption mechanism of selected pollutants onto carbon samples has been controlled by dispersion interaction π-π electrons and electrostatic interaction, moreover, the contribution of pore volume diffusion is the controlling mechanism of the overall rate of adsorption.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 4; 1-12
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biological synthesis of Titanium Dioxide nanoparticles by Curcuma longa plant extract and study its biological properties
Autorzy:
Abdul Jalill, Raghad DH.
Nuaman, Rasha S.
Abd, Ahmed N.
Powiązania:
https://bibliotekanauki.pl/articles/1182934.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
biosynthesis
curcuma longa
damping-off
nanoparticles
plant
tio2
Opis:
The objective of this study was biosynthesis of titanium dioxide nanoparticles (TiO2 NPs) using Curcuma longa aqueous extract and characterize them. Study their effect on the growth, sporulation, pathogenicity of Fusarium graminearum and some wheat plants parameters compared with standards industrials nanoparticles. C. longa aquatic extract was used to biosynthesis TiO2 NPs by two methods. At first method, TiO2 was found in both colloidal solutions (CS) and nanopawder while it found in jest nanopawder in second method. All biosynthetic nanoparticles were in nano size. It was: 91.37 nm, 76.36 nm of (CS) and nanopawder for first methods respectively while it was 92.6 nm of nanopawder in second method. All nanoparticles have good optical properties. Crystal’s shape of nanopawder were in three form: anatase, rutilr and brookite and it was anatase in colloidal solutionat first method while it was pure anatase innanopawder when at second method. The average crystallite size of was calculate by Scherer's equation, it was 43.088 nm and 22.881 nm for nanopawder and colloidal solution respectively at first method. It was 45.808 nm for nanopawder at second method. All concentrations of nanoparticles were reduced fungal and spores. These decreasing were more effective using biosynthetic compare with industrial synthetic nanoparticles. There were reductions in damping-off caused by F. graminearum by biosynthetic NBs in both varieties of plant (Al-Rasheed and Tamuze-2). These was better than the effect of industrial synthetic nanoparticles. The resistance to damping off and the growth of plant in Al-Rasheed variety was more sensitive compared with Tamuze-2 variety especially at higher concentrations. There were decrease in all plant's parameters at most concentrations of TiO2 biological synthetic compare with industrial synthetic nanoparticles in Al-Rasheed variety, while there were inductions in some plant's parameters by biosynthetic nanoparticles compared with industrial synthetic in Tamuze-2 variety. Finally, C. longa can be used to biosynthesis TiO2 NPs with good biological properties.
Źródło:
World Scientific News; 2016, 49, 2; 204-222
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of a subgrade soil by using EarthZyme and cement kiln dust waste
Autorzy:
Abdulkareem, Ahmed Hazim
Eyada, Saadoon O.
Mahmood, Nabeel S.
Powiązania:
https://bibliotekanauki.pl/articles/1852537.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stabilizacja gruntu
ściskanie nieskrępowane
EarthZyme
pył z pieca cementowego
nanomateriał
soil stabilization
unconfined compressions
cement kiln dust
nanomaterial
Opis:
Soil stabilization techniques are widely used for road construction to improve the properties of the subgrade materials. Using new additives and stabilizers to improve soil properties can reduce the costs of construction and reduce the possible negative effects of these materials on the environment. The purpose of this study was to evaluate the use of a liquid based nano-material called EarthZyme (EZ) and cement kiln dust (CKD) as admixtures to improve the soil properties. A mixture of two soils was used in this study which were prepared from mixing sand soil and fine-grained soil. Compaction tests were performed on the soil that was stabilized with the CKD to determine the density-water content relationships. Unconfined compression tests were also conducted on specimens without treatment, specimen treated with the CKD only, and specimens treated with the CKD and the EZ after curing period for seven days. The obtained results indicated that adding the CKD to the soil decreased the values of the unconfined compression strength (UCS) from 5 to 15 percent. However, adding the CKD reduced the maximum dry density (MDD) from 10 to 12 %. As discussed herein, soil stabilization with the EZ had insignificant effects on the results obtained from the unconfined compression test.
Źródło:
Archives of Civil Engineering; 2021, 67, 2; 525-536
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of wood-derived biochar on the hydraulic characteristics of compacted soils: Its influence on simulated farmland carbon sequestration
Autorzy:
Ahmed, A.
Kurian, J.
Satyanarayana, S.
Raghavan, V.
Powiązania:
https://bibliotekanauki.pl/articles/2083067.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil biochar mixture
water retention
pore-size
distribution
hydraulic conductivity
carbon sequestration
Opis:
The addition of biochar is often proposed to increase agricultural soil quality and crop yield, while at the same time sequestering carbon from the atmosphere to help mitigate global climate change. In this research, the pore-size distribution, and saturated hydraulic conductivity of sandy loam and clay loam soils amended with varying dosages (0-10% dry basis) and two different particle sizes (0.5-420 μm (PS1) or 421-841 μm (PS2)) of wood-derived biochar were investigated under compacted conditions (5, 10, or 15 standard Proctor rammer blows (5B, 10B, or 15B, respectively)). In the 5B compacted SL (SL-5B) soil, the volume of the soil fissures and transmission pores decreased, while the volume of the storage pores (SP) increased with increasing wood-derived biochar dosage. 23.1±0.9% of the volume of the 5B compacted clay loam (CL-5B) are storage pores, this value increased to 27.4±2.0% upon amendment with 10% PS1. The saturated hydraulic conductivity of the sandy loam-5B soil amended with 10% PS1 decreased from 6.8±0.3 to 0.80±0.03 mm h-1. The sandy loam farmland C emissions decreased by 0.071 tC ha-1 y-1, whereas CL farmland C emissions decreased by 0.091 tC ha-1 y-1.
Źródło:
International Agrophysics; 2021, 35, 2; 167-177
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sequential Pattern Discovery Algorithm for Malaysia Rainfall Prediction
Autorzy:
Ahmed, A.
Bakar, A.
Hamdan, A.
Syed Abdullah, S.
Jaafar, O.
Powiązania:
https://bibliotekanauki.pl/articles/1402374.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
92.40.Zg
92.60.Wc
Opis:
This study proposes a sequential pattern mining algorithm to discover sequential patterns of Malaysia rainfall data for prediction. The apriori based algorithm is employed to find the sequential patterns from the time series data. The frequent episodes of rainfall sequences are discovered and classified by the expert into four main events namely, No rain, Light, Moderate and heavy. The sequential rules of ten rainfall stations from the duration of 33 years are analysed. The proposed algorithm is able to generate higher confidence and support of frequent and sequential patterns. Generally, the proposed study has shown its potential in producing methods that manage to preserve important knowledge and thus reduce information loss in weather prediction problem.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-324-B-326
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Some Inorganic Anions and Organic Compounds as Corrosion Inhibitors of Cu-Zn Alloys in H2SO4 and HNO3 Solutions
Autorzy:
Ahmed, Amal S. I.
Ghanem, Wafaa A.
Hussein, Walaa A.
Gaber, Ghalia A.
Powiązania:
https://bibliotekanauki.pl/articles/351226.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cu-Zn alloys
oxy-acid solution
inhibition efficiency
inorganic anions
organic compounds
Opis:
Evaluation of inorganic and organic compounds as corrosion inhibitors of Cu-Zn alloys in H2 SO4 and HNO3 solutions was studied using potentiodynamic and impedance spectroscopy along with scanning electron microscope (SEM) and energy dispersive X-Ray analyzer (EDX) investigations. The corrosion inhibition of Cu-Zn alloys was investigated in oxy acid solutions using inorganic potassium permanganate and di-hydrogen phosphate, amino acids as environmentally safe materials, commercial cooling water, and green tea extracts. Both potassium permanganate and di-hydrogen phosphate improve the corrosion resistance of Cu-Zn alloys. Phosphate appears more effective as corrosion inhibitor for Cu-Zn alloys than permanganate. The inhibition efficiency (IE%) of the different amino acids such as valine, leucine and lysine was also calculated. The experimental results have shown that amino acid-like lysine can be used as an efficient corrosion inhibitor for the Cu-Zn alloys in oxy acid solutions. This may be due to the presence of two amino groups adsorbed together. For lysine, inhibition efficiency, IE%, of ~87 and ~59 is for H2SO4 and ~96.3 and 54.9 for HNO3 for alloy I and II respectively are observed. Due to the composition of green water have a great effect on the inhibition action on Cu-Zn alloys which reaching 91.8 and 96.5% for Alloy I and 95.4 and 87.1% for Alloy II in 0.5 M H2 SO4 and HNO3 respectively. Although benzotriazole, in cooling water, is an excellent inhibitor suitable for use in a wide variety of environments, it has toxic properties. So, much of the recent researches have focused on formulating new and more environmentally acceptable preservation solutions. The green tea, as plant extract, will be very environmentally friendly. The EDX confirm the formation of a protective layer on the Cu-Zn alloys containing aluminum in Alloy II. This sequence reflects the beneficial effects of Al in Alloy II. The presence of 2.43% Al in Alloy II improves the corrosion resistance due to the formation of thin, transparent, stable and self-healing Al2 O3 layer. This confirmed the results obtained from the potentiodynamic polarization measurements and EIS methods.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 639-651
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Residual strength and toughness after impact loading for RC slabs strengthened with different layers of geogrid
Autorzy:
Ahmed, Aya M. E.
Hamdy, Osman
Saad, Youssef L. Z.
Ahmad, Seleem S. E.
Powiązania:
https://bibliotekanauki.pl/articles/36064265.pdf
Data publikacji:
2023
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
impact load
geogrid
RC slab
residual strength
static flexural load
toughness
toughness index
Opis:
This study presents an experiment for investigating the residual strength and toughness of reinforced concrete, RC, and slab reinforced by a geogrid as shrinkage reinforcement along with lower tensile steel reinforcement. Three different parameters were considered, slab thickness, number of geogrid layers, and thickness of the upper concrete cover. Fifteen slab samples with sizes of 50 × 50 cm exposed to the impact load on its center before being re-load by the static load and six slab samples exposed to the static load only. The load and deflection relation were recorded through the static loading process for all specimens, where loading capacity, toughness, and toughness index were measured. The results show an enhancement in the slabs residual strength as the slab thickness and concrete cover increased. On the other hand, the residual strength of slabs has a remarkable decrease with the increase in geogrid layers. Moreover, the toughness has a positive relationship with the concrete cover and has an inverse relation with the slab thickness and the number of layers. A geogrid reduced the number and distribution of cracks and mitigated their severity, especially for double layers with the same concrete cover.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2023, 32, 2; 117-134
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flotation after a direct contact of flotation reagents with carbonate particles. Part 1, Model investigations
Autorzy:
Ahmed, H. A. M.
Aljuhani, M. S.
Drzymala, J.
Powiązania:
https://bibliotekanauki.pl/articles/109753.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
phosphates
flotation
microemulsion
separation Introduction
Opis:
Carbonate fluorapatite (francolite), calcite and dolomite separately, as well as their model mixtures, were subjected to flotation after conditioning the particles with microemulsion consisting of 20% of Custafloat AR27 (collector, blend of fatty acid soaps and sulfates), 55% fuel oil #5 and 25% water at 70% solids density and subsequent pulp dilution with water to 25% solids. The best separation of carbonate fluorapatite from calcite and dolomite occurred at pH 8.5 and microemulsion dose between 0.9 and 1.5 kg/Mg, 1.5 min conditioning time and 2 minutes of flotation time. The obtained flotation concentrates using 1.5 kg/Mg of collector contained 84% carbonate fluorapatite (34% P2O5) with 84% recovery. The 84/84 separation efficiency in terms of grade-recovery indices points to promising results which can be obtained for real phosphate ores.
Źródło:
Physicochemical Problems of Mineral Processing; 2013, 49, 2; 713-723
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena energii rozdrabniania składników cementowych
Energy assessment in mixture grinding of cement raw materials
Autorzy:
Ahmed, H. A. M.
Al-Maghrabi, M. N.
Haffez, G. S. A.
Powiązania:
https://bibliotekanauki.pl/articles/318945.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
ocena energii
składniki cementowe
rozdrabnianie
energy assessment
cement raw materials
mixture grinding
Opis:
Przemysł cementowy stosuje rozdrabnianie, które zużywa dużo energii. Zatem proces rozdrabniania cementu jest ważnym zagadnieniem. Dlatego w tym artykule rozważano rozdrabnianie surowego cementu w okresowym młynie kulowym według różnych metodologii, w tym mielenie każdego składnika (glina, kwarcyt, wapień) osobno oraz mielenie ich razem jako mieszaniny trzech składników. Oceniano zużycie energii dla obu rozwiązań. Dodatkowo, w przypadku mieszaniny trzech składników, zmieniano stosunek wszystkich trzech składników. Wyniki oceniano za pomocą składu ziarnowego produktów mielenia dla odpowiednich poziomów zużycia energii i podziału zużytej energii pomiędzy składniki mieszaniny. Stwierdzono, że ilość zużytej na mielenie energii silnie wpływa na ziarnowy moduł Gaudina-Schumanna w zależności od tego, czy materiał był mielony jako mieszanina czy też nie. W przeciwieństwie do tego, wpływ zużywanej energii na dystrybucyjny moduł Gaudina-Schumanna był niewielki. Ustalono, że zmodyfikowane równanie Charlesa, stosowane do obliczania energii rozdrabniania mieszaniny, opisuje bardzo dobrze dystrybucję energii pomiędzy składnikami mieszaniny. Dystrybucja energii pomiędzy składnikami mieszaniny zależy w dużym stopniu od udziału twardych składników, które zwiększają rozdrabnialność składników miękkich. Z tego powodu kwarc wykorzystuje tylko 96% energii przewidywanej dla mieszaniny 1:2:1 dla wszystkich stosowanych poziomów zużycia energii.
Cement industry depends mainly on grinding which is an energy intensive unit operation. Thus, understanding the behaviour of cement raw materials grinding is a vital issue. Therefore, this paper considers batch ball mill grinding of cement raw materials according to different grinding schemes, including single grinding of each component (clay quartzite, limestone) separately and grinding them together in ternary mixtures. The applied energy levels were verified for both schemes. In addition, in the ternary mixtures case, the ratio between the components was changed. The results were judged in light of the product size distribution at specified level of energy and the energy distribution between the mixture components. It was found that increasing the grinding energy level sharply affects the Gaudin-Schumann size modulus of the ground material whether was ground as single or a mixture. On contrary, the energy influence on the Gaudin-Schumann distribution modulus was minor. It was also found that the modified Charles equation for energy calculation (in mixture grinding) expresses very well the energy distribution between the mixture components. The energy distribution among the mixture components depends to a large extent on the hard component portion which enhances the grindability of the soft ones. For that reason quartz utilizes only 96% of its predicted energy in the mixture 1:2:1 at any applied level of grinding energy.
Źródło:
Inżynieria Mineralna; 2007, R. 8, nr 1, 1; 1-14
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of an optical catalyst for cracking contaminating dyes in the wastewater of factories using indium oxide in nanometer and usage in agriculture
Autorzy:
Ahmed, Ishaq F. E.
El-Shenawy, Ahmed I.
Refat, Moamen S.
Powiązania:
https://bibliotekanauki.pl/articles/778735.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Photocatalyst
In2O3
precursors
Crystal Violet
Congo Red
NPs
Opis:
Herein, the photocatalytic degradation of the Congo Red (CR) and Crystal Violet (CV) dyes in an aqueous solution were discussed in the presence of an indium(III) oxide (In2O3) as optical catalyst efficiency. The caproate bidentate indium(III) precursor complex has been synthesized and well interpreted by elemental analysis, molar conductivity, Fourier transform infrared (FT-IR), UV-Vis, and thermogravimetric (TGA) with its differential thermogravimetric (DTG) studies. The microanalytical and spectroscopic assignments suggested that the associated of mononuclear complex with 1:3 molar ratio (M3+:ligand). Octahedral structure is speculated for this parent complex of the caproate anion, CH3(CH2)4COO− ligand. The In2O3  NPs with nanoscale range within 10–20 nm was synthesized by a simple, low cost and eco-friendly method using indium(III) caproate complex. Indium oxide nanoparticles were formed after calcination of precursor in static air at 600°C for 3 hrs. The structural, grain size, morphological and decolorization efficiency of the synthesized NPs were characterized using the FT-IR, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and transmission electron microscopy (TEM) analyses. It was worthy mentioned that the prepared In2O3  NPs showed a good photodegradation properties against CR and CV organic dyes during 90 min.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 4; 98-105
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Passive filter design for three-phase inverter interfacing in distributed generation
Autorzy:
Ahmed, K. H.
Finney, S. J.
Williams, B. W.
Powiązania:
https://bibliotekanauki.pl/articles/262578.pdf
Data publikacji:
2007
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
DG
inverter
grid connected
filtering
damping
harmonics
Opis:
With the growing use of inverters in distributed generation, the problem of injected harmonics becomes critical. These harmonics require the connection of low pass filters between the inverter and the network. This paper presents a design method for the output LC filter in grid coupled applications in distributed generation systems. The design is according to the harmonics standards that determine the level of current harmonics injected into the grid network. Analytical expressions for the maximum inductor ripple current are derived. The filter capacitor design depends on the allowable level of switching components injected into the grid. Different passive filter damping techniques to suppress resonance affects are investigated and evaluated. Simulated results are included to verify the derived expressions.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2007, 13, 2; 49-58
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biodiversity in morphological and physico-chemical characteristics of wild raspberry (Rubus idaeus L.) germplasm collected from temperate region of Azad Jammu and Kashmir (Pakistan)
Różnorodność biologiczna w morfologicznych i fizyko-chemicznych cechach materiału genetycznego maliny właściwej (Rubus idaeus L.) zbieranej w regionie umiarkowanym Azad Jammu i Kaszmiru (Pakistan)
Autorzy:
Ahmed, M.
Anjum, M.A.
Khaqan, K.
Hussain, S.
Powiązania:
https://bibliotekanauki.pl/articles/11542966.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
biodiversity
morphological characteristics
physicochemical characteristics
wild plant
raspberry
Rubus idaeus
germplasm
temperate region
Azad Jammu and Kashmir
Pakistan
Opis:
Wild raspberry (Rubus idaeus L.) is abundantly grown and widely distributed in temperate regions of lower Himalayan range which represents rich biological diversity for raspberry. Thirty accessions were explored from three different locations of Azad Jammu and Kashmir (Pakistan), several traits were visualized at sampling locations and some characteristics were evaluated and quantified after harvest of leaf and fruit samples. The accessions differed greatly in growth habit, blooming time, intensity of flowering, fruit setting, ripening time, productivity, fruit shape and color. Concerning quantitative characteristics, significant differences were found in plant height, leaf length and width, number of braches per plant, duration of flowering, fruit setting percentage, days to maturity, fruit length, width and weight among the samples collected from different locations. Ripe fruits were evaluated for their chemical composition i.e. moisture, carbohydrates, protein, fat, fiber, ash, TSS, acidity, pH and mineral (K, Ca, Na, Fe, Cu, Zn, Mn, Pb, and Cr) contents. The location also had significant effect on chemical composition of ripe fruits.
Malina właściwa (Rubus idaeus L.) jest często hodowana i szeroko rozprowadzana w umiarkowanych rejonach niższego pasma Himalajów, które reprezentuje bogatą różnorodność biologiczną malin. Zbadano trzydzieści próbek z trzech różnych miejsc Azad Jammu i Kaszmiru (Pakistan), dokonano wizualizacji kilkunastu cech w miejscach pobierania próbek oraz oceniono i ilościowo określono kilka cech po zebraniu próbek liści i owoców. Próbki znacznie różniły się wzrostem, czasem kwitnienia, intensywnością zakwitania, zawiązywaniem owoców, czasem dojrzewania, plonowaniem oraz kształtem i kolorem owoców. Jeśli chodzi o cechy ilościowe, to stwierdzono istotne różnice w wysokości roślin, długości i szerokości liści, liczbie gałązek na roślinie, długości kwitnienia, procencie zawiązywanych owoców, liczbie dni do dojrzałości, długości owoców, szerokości i wadze pomiędzy próbkami zebranymi z różnych stanowisk. Dojrzałe owoce oceniono pod względem składu chemicznego, tzn. wilgotności, zawartości węglowodanów, białka, tłuszczu, błonnika, popiołu, TSS, kwasowości, pH oraz zawartości minerałów (K, Ca, Na, Fe, Cu, Zn, Mn, Pb oraz Cr). Stanowisko także miało istotny wpływ na skład chemiczny dojrzałych owoców.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2014, 13, 4; 117-134
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessing the impact of the compliance rate and daytime running lights penetration on the safety effectiveness of regulatory headlight use signs
Autorzy:
Ahmed, M. M.
Gaweesh, S.
Ksaibati, K.
Rahman, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/2140903.pdf
Data publikacji:
2018
Wydawca:
Fundacja Centrum Badań Socjologicznych
Tematy:
Daytime Running Lights
safety
headlight signs
safety effectiveness
Opis:
While Daytime Running Lights (DRLs) are proven to increase vehicle conspicuity during various times of the day, their safety effectiveness is still debatable. This study utilized various statistical techniques and a field study to assess the impact of the compliance rate, and the penetration of the Daytime Running Lights (DRLs) technology on the safety efficacy of regulatory headlight use signs. Daytime head-on and opposite sideswipe multivehicle crashes for Daytime Running Lights and non-DRLs equipped passenger vehicles on mountainous rural two-way highway sections with and without regulatory headlight use signs were examined in a matched case control design. Preliminary analysis showed that only 23% of vehicles involved in crashes on the study sections were equipped with DRLs. Although results from the odds ratios and ratios of odds ratios indicated some safety benefits of the headlight use signs, the safety benefits were statistically insignificant. The study concluded that the low compliance rate of 12% affected the safety effectiveness of the regulatory headlight signs. Transportation agencies should have different considerations when evaluating the safety effectiveness of compliance-and behavioral-based countermeasures.
Źródło:
Journal of Sustainable Development of Transport and Logistics; 2018, 3, 1; 6-21
2520-2979
Pojawia się w:
Journal of Sustainable Development of Transport and Logistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 82

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