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1
Content available Nonlinear vibration analysis of prebuckling and postbuckling in laminated composite beams
100%
Abdollahzadeh G. , Ahmadi M. , Abdollahzadeh G. , Ahmadi M.
|
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nr 2
2
Growth and mineral content of coriander (Coriandrum sativum L.) plants under mild salinity with different salts
89%
Ahmadi M. , Souri M. K.
Acta Physiologiae Plantarum
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2018
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tom 40
|
nr 11
3
Badania metoda emisyjnej spektrometrii atomowej [ESA] nad zawartoscia jonow metali w cukrze bialym, melasie i blocie defekosaturacyjnym
89%
Maslowska J. , Ahmadi M.
Zeszyty Naukowe Politechniki Łódzkiej. Technologia i Chemia Spożywcza
|
1995
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tom 49
55-69
4
Content available Nutrient uptake, proline content and antioxidant enzymes activity of pepper (Capsicum annuum L.) under higher electrical conductivity of nutrient solution created by nitrate or chloride salts of potassium and calcium
89%
Ahmadi M. , Souri M. K.
Acta Scientiarum Polonorum. Hortorum Cultus
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2019
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tom 18
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nr 5
EN
This study was conducted to evaluate the effects of higher conductivity of nutrient solution created by nitrate or chloride salts of potassium and calcium on growth characteristics of pepper plants (Capsicum annuum var annuum) during four months of growth period. Two EC5 and EC8 dS/m of Hoagland nutrient solutions were prepared using various salt combinations, namely: KCl + CaCl2, KNO3 + CaNO3, and KNO3 + CaNO3 + NaCl. Hoagland nutrient solution with EC 1.8 dS/m served as a control. Higher conductivity treatments had different effects on pepper plant growth. The most significant reduction in growth parameters of plant height, shoot fresh weight, fruit yield and nutrients uptake was in plants treated with KCl + CaCl2 particularly at EC8. Application of KNO3 + CaNO3 particularly at EC5, showed no difference as compared to the control regarding many growth parameters. Application of KNO3 + CaNO3 at EC5 resulted in higher shoot fresh weight compared to the control. All salinity treatments, except from KNO3 + CaNO3 at EC5, reduced the fruit yield compared to the control. Treatments of KCl + CaCl2 and KNO3 + CaNO3 + NaCl particularly at EC8 of nutrient solution, resulted in higher leaf proline concentration, catalase and peroxidase enzymes activity compared to the control. Other conductivity treatments showed no difference in catalase or peroxidase enzymes activities. Significantly the lowest amount of leaf N, K, Mg and Ca was in KCl + CaCl2 at EC8. On the other hand, the highest leaf macronutrient concentrations were in KNO3 + CaNO3 at EC5 and/or EC8 that showed only higher leaf N and Ca values compared to the control. Leaf micronutrient concentrations were the highest in KNO3 + CaNO3 at EC5 that generally showed no difference with control plants. However, application of KCl + CaCl2 particularly at EC8 and to less extent KNO3 + CaNO3 + NaCl at EC8, reduced the leaf micronutrient concentrations. Application of KNO3 + CaNO3 at EC5 increased and KCl + CaCl2 or KNO3 + CaNO3 + NaCl at EC8 decreased the leaf Fe concentration compared to control plants.
5
Badanie poziomu składników mineralnych w cukrze białym metodą emisyjnej spektrometrii atomowej (ESA)
89%
Maslowska J. , Ahmadi M.
Przemysł Spożywczy
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1989
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tom 43
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nr 02
6
Content available Nonlinear vibration analysis of prebuckling and postbuckling in laminated composite beams
89%
Abdollahzadeh G. , Ahmadi M.
Archives of Civil Engineering
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2015
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tom Vol. 61, nr 2
161--178
EN
In this study, we attempt to analyse free nonlinear vibrations of buckling in laminated composite beams. Two new methods are applied to obtain the analytical solution of the nonlinear governing equation of the problem. The effects of different parameters on the ratio of nonlinear to linear natural frequencies of the beams are studied. These methods give us an agreement with numerical results for the whole range of the oscillation amplitude.
PL
Niniejsze opracowanie podejmuje temat analizy swobodnych drgań nieliniowych wyboczenia laminowanych belek kompozytowych. Zastosowano dwie nowe metody w celu uzyskania rozwiązania w postaci kluczowego równania nieliniowego, opisującego ten problem. Przestudiowano wpływ różnych parametrów na stosunek częstotliwości drgań nieliniowych do drgań liniowych w odniesieniu do badanych belek. Metody te umożliwiły nam weryfikację otrzymanych wyników dla całego zakresu amplitudy oscylacji.
7
Badania zawartości pierwiastków toksycznych w melasie i błocie defekosaturacyjnym metodą widm emisyjnych
89%
Maslowska J. , Ahmadi M.
Przemysł Spożywczy
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1991
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tom 45
|
nr 08
8
Content available Characteristics of postharvest quality of chrysanthemum cut flowers under pretreatment with nitrogenous compounds
71%
Souri M. K. , Goodarzizadeh S. , Ahmadi M. , Hatamian M.
Acta Scientiarum Polonorum. Hortorum Cultus
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2018
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tom 17
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nr 3
EN
This study was done using three nitrogenous compounds to evaluate their effects on postharvest characteristics of chrysanthemum (Chrysanthemum indicum) cut flowers. The study consisted of three separate and parallel experiments, in which ammonium sulfate, calcium nitrate and potassium nitrate were used in different concentrations of zero, 50, 100, 200 and 500 mg dm ‒3 N for pretreatment of stems for 6 hour before transferring to holding d-water solution. The results showed that petal ion leakage and leaf SPAD values were increased by increasing ammonium sulfate, but not calcium or potassium nitrate. Petal carotenoids were increased by pretreatment of ammonium sulfate and potassium nitrate. There was constant increase in water uptake by increasing the levels of calcium nitrate and potassium nitrate, while ammonium sulfate at high concentrations (200 and 500 mg dm ‒3 N) resulted in significant less water uptake compared to control. Ammonium sulfate in 50 and 100 mg dm ‒3 increased shelf life of pretreated stems, but higher concentrations significantly reduced cut flowers shelf life. Increasing concentrations of calcium nitrate and particularly potassium nitrate have led to prolongation of flower shelf life to 12 days compared to 6 days of control. The results indicate that pretreatment of chrysanthemum cut flowers with ammonium sulfate in rather low concentrations or with moderate to high concentrations of calcium nitrate or potassium nitrate can significantly improve shelf life and postharvest flower qualities.
9
Content available remote Utilization of artificial neural networks to prediction of the capacity of CCFT short columns subject to short term axial load
71%
Ahmadi M. , Naderpour H. , Kheyroddin A.
Archives of Civil and Mechanical Engineering
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2014
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tom Vol. 14, no. 3
510--517
EN
Due to high strength and ductility, concrete filled steel tube columns have been highly regarded in recent decades and many experimental studies have been carried out in predicting the strength of these columns. Increase in compressive strength of concrete core by the lateral confinement provided by steel tube and delay of the steel local buckling by the contact with the hardened concrete are effective parameters in behavior of concrete filled steel tubes. This study presents a new approach to predict the capacity of circular concrete filled steel tube columns under axial loading condition, using a large number of experimental data by applying artificial neural networks. The effects of yield stress and wall thickness of steel tube, compressive strength of concrete and dimensions of column are examined. Proposed equation is compared with other existing models and indicates that the new model can predict the ultimate strength of axially loaded columns by a high level of precision.
10
Content available Characteristics of GZO/IZO Dual-Layer as an Electron Transport Layer in Dye-Sensitized Solar Cell
71%
Manzari Tavakoli M. H. , Ahmadi M. , Sabet M.
Archives of Metallurgy and Materials
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2018
|
tom Vol. 63, iss. 4
1609--1614
EN
GZO/IZO semiconductor thin films were prepared on the ITO substrate via sol-gel spin coating method for using in the dye-sensitized solar cells (DSSCs). For this purpose, GZO and IZO thin films were optimized by the percentage of doping gallium and indium in zinc oxide and were studied their electrical, optical and structural properties. After that, the layers with the best performance were selected for use in the DSSCs. The concentration of all solutions for spin coating processes was 0.1 M and zinc oxide has been doped with gallium and indium, with different doping percentages (0, 0.5, 1, 2 and 4 volume percentage). So, by studying the properties of the fabricated thin films, it was found the films with 0.5%GZO and 0.5%IZO have the best performance and hence, the optimized dual-layer (0.5% GZO/0.5% IZO (GIZO)) were prepared and studied their electrical and optical properties. The synthesized optimized dual-layer film was successfully used as the working electrode for dye-sensitized solar cells. The sample with 0.5%IZO shows the 9.1 mA/cm2 short-circuit current density, 0.52 V open circuit voltage, 63% fill factor and 2.98% efficiency.
11
Content available Removal of benzotriazole by Photo-Fenton like process using nano zero-valent iron: response surface methodology with a Box-Behnken design
71%
Ahmadi M. , Rahmani K. , Rahmani A. , Rahmani H.
Polish Journal of Chemical Technology
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2017
|
tom Vol. 19, nr 1
104--112
EN
In this paper, the removal of benzotriazole (BTA) was investigated by a Photo-Fenton process using nano zero valent iron (NZVI) and optimization by response surface methodology based on Box-Behnken method. Effect of operating parameters affecting removal efficiency such as H2O2, NZVI, and BTA concentrations as well as pH was studied. All the experiments were performed in the presence of ultraviolet radiation. Predicted levels and BTA removal were found to be in good agreement with the experimental levels (R2 = 0. 9500). The optimal parameters were determined at 60 min reaction time, 15 mg L-1 BTA, 0.10 g L-1 NZVI, and 1.5 mmol L-1 H2O2  for Photo-Fenton-like reaction. NZVI was characterized using X-ray diffraction (XRD), transmission electron microscope (TEM) images, and scanning electron microscope (SEM) analysis.
12
Content available First Observation of Vertically Aligned Cesium Doped ZnO Nanorods as an Efficient Electron Transporter in Polymer Solar Cell
71%
Ahmadi M. , Rashidi Dafeh S. , Ghazanfarpour S. , Khanzadeh M.
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|
nr 4
13
Content available remote Fat Dormouse (Glis glis L.) Distribution Modeling in the Hyrcanian Relict Forests of Northern Iran
71%
Naderi M. , Kaboli M. , Ahmadi M. , Kryštufek B.
Polish Journal of Ecology
|
2016
|
tom Vol. 64, nr 1
136--142
EN
The fat dormouse (Glis glis L.) is a small arboreal and extreme habitat specialist mammal that is tightly linked to the deciduous mixed forests dominated by Beech (Fagus orientalis) and oaks (Quercus sp.). Despite its status in Iran as a least concern species, dormice face high risk of extinction in some parts of Europe. The unique life history and large scale distribution of the species in the Palearctic region made it as an ideal model species. This habitat specialist rodent is particularly sensitive to size and connectivity of the forest patches. The fat dormouse shows very deep molecular and morphological divergence in its eastern most parts of its global distribution, in the Hyrcanian refugium of the Northern Iran. Therefore modeling its distributional range can leads to identify biodiversity hotspots and planning conservation activities. The meteorological data, land cover types, topographical variables and geo-referenced points representing geographical locations of the fat dormouse populations (latitude/longitude) in the study area were used as the primary MaxEnt model input data. The predictive accuracy of the Fat Dormouse ecological niche model was significant (training accuracy of 93.3%). This approach successfully identified the areas of the fat dormouse presence across the study area. The result suggests that the maximum entropy modeling approach can be implemented in the next step towards the development of new tools for monitoring the habitat fragmentation and identifying biodiversity hotspots.
14
Fat dormouse (Glis glis L.) distribution modeling in the Hyrcanian relict forests of Northern Iran
71%
Naderi M. , Kaboli M. , Ahmadi M. , Krystufek B.
Polish Journal of Ecology
|
2016
|
tom 64
|
nr 1
EN
The fat dormouse (Glis glis L.) is a small arboreal and extreme habitat specialist mammal that is tightly linked to the deciduous mixed forests dominated by Beech (Fagus orientalis) and oaks (Quercus sp.). Despite its status in Iran as a least concern species, dormice face high risk of extinction in some parts of Europe. The unique life history and large scale distribution of the species in the Palearctic region made it as an ideal model species. This habitat specialist rodent is particularly sensitive to size and connectivity of the forest patches. The fat dormouse shows very deep molecular and morphological divergence in its eastern most parts of its global distribution, in the Hyrcanian refugium of the Northern Iran. Therefore modeling its distributional range can leads to identify biodiversity hotspots and planning conservation activities. The meteorological data, land cover types, topographical variables and geo-referenced points representing geographical locations of the fat dormouse populations (latitude/longitude) in the study area were used as the primary MaxEnt model input data. The predictive accuracy of the Fat Dormouse ecological niche model was significant (training accuracy of 93.3%). This approach successfully identified the areas of the fat dormouse presence across the study area. The result suggests that the maximum entropy modeling approach can be implemented in the next step towards the development of new tools for monitoring the habitat fragmentation and identifying biodiversity hotspots.
15
Content available Thermally activated persulfate treatment and mineralization of a recalcitrant high TDS petrochemical wastewater
71%
Jorfi S. , Pourfadakari S. , Ahmadi M. , Akbari H.
Polish Journal of Chemical Technology
|
2017
|
tom Vol. 19, nr 2
72--77
EN
Thermally activated persulfate efficiency for the treatment of a recalcitrant high TDS wastewater was investigated. The specific character of studied wastewater was high TDS content of around 23820 mg/L and BOD5/COD ratio of 0.07. Effective operational parameters including initial pH values of 3–9, reaction temperature of 40–80°C and persulfate concentrations of 0.5–5 g/L for COD removal were investigated in batch mode experiments. Removal efficiency was pH and temperature dependent. The COD and TOC removal of 94.3% and 82.8% were obtained at persulfate concentration of 4 g/L, initial pH value of 5 and temperature of 70°C after 180 min for initial COD concentration of 1410 mg/L. The pseudo first-order kinetic model was best fitted with COD removal (R2  = 0.94).
16
Content available First observation of vertically aligned cesium doped ZnO nanorods as an efficient electron transporter in polymer solar cell
71%
Ahmadi M. , Rashidi Dafeh S. , Ghazanfarpour S. , Khanzadeh M.
Archives of Metallurgy and Materials
|
2018
|
tom Vol. 63, iss. 4
1571--1574
EN
Single crystalline cesium doped ZnO nanorods with homogeneous size and shape were grown hydrothermally on ITO substrates that are presented in our previous work. According to the previous work, XRD analysis showed that cesium doped ZnO nanorods are wurtzite single crystals and are grown preferentially along the c-axis. Also, the electrical conductivity of doped ZnO showed higher values for the 1% cesium, which confirmed incorporation of the cesium dopant. Cesium doped ZnO nanorods are suitable candidates for applications in solar cells. So, in this research, we employed cesium doped ZnO nanorods with the different dopant concentration in inverted polymer solar cell. By comparing the effect of doped ZnO nanorods with diverse dopant concentration (0, 0.5, 1.0, 1.5 and 2%) on the performance of devices, 1.0% cesium doped ZnO was found as the most effective doping level among the selected doping concentrations. Also, using 1.0% cesium doped ZnO nanorods, Jsc of 8.21 mA/cm2, Voc of 0.541V and Fill Factor of 63.01% were achieved, which led to power conversion efficiency of 2.80%.
17
Complexes of Ni[II], Cd[II] and Pb[II] with polyalcohol type polymers for heavy matal ions removal from waters in ultrafiltration process
71%
Maslowska J. , Kurkowska-Mielczarek A. , Ahmadi M.
Zeszyty Naukowe Politechniki Łódzkiej. Technologia i Chemia Spożywcza
|
1996
|
tom 56
103-114
18
Content available Enhancement the conditioning of waste activated sludge through a sequence of freeze/thaw-electro-Fenton process
62%
Shahheidar N. , Jorfi S. , Takdastan A. , Jaafarzadeh N. , Ahmadi M.
Polish Journal of Chemical Technology
|
2018
|
tom Vol. 20, nr 1
47--53
EN
Sludge conditioning is an important stage in sludge management. In the present study, a sequence of freeze/thaw-electro-Fenton process was designed and specific resistance filtration (SRF) was monitored during sludge conditioning as an important factor in sludge dewaterability. Furthermore, protein and polysaccharide concentrations were measured during the experiments. Results showed that the lowest SRF value contributed to −10°C in freezing process which showed a reducing trend by decreasing solution pH. In addition, results revealed that solution pH less than 3 caused a significant improvement in sludge dewatering; so the lowest SRF has been registered at pH = 2. By increasing current intensity from 0.5 to 1A, SRF values were reduced and then followed by an enhancement with increasing current intensity to 3.2 A. The lowest SRF value (6.1 × 104 m/kg) was obtained at H2O2 = 30 mg/L which was the best conditions for sludge dewatering.
19
Content available An optimum level of nano-selenium supplementation of a broiler diet according to the performance, economical parameters, plasma constituents and immunity
62%
Ahmadi M. , Poorghasemi M. , Seidavi A. , Hatzigiannakis E. , Milis C.
Journal of Elementology
|
2020
|
tom 25
|
nr 3
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