Wyniki wyszukiwania - Biblioteka Nauki

1

Contrasting foliar and soil nutrients responses to drought induced crown dieback in a Quercus brantii forest

100%

Hosseini A. , Hosseini S. M.

Dendrobiology

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2022

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tom 87

2

Survival, growth and mineral accumulation in ash Fraxinus excelsior L. seedlings irrigated with water treatment effluent

100%

Selahvarzi B. , Hosseini S. M.

Folia Forestalia Polonica. Series A . Forestry

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2012

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tom 54

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nr 3

3

Model development of integrated CPOx reformer and SOFC stack system

80%

Pianko-Oprych P. , Hosseini S. M. , Jaworski Z.

Polish Journal of Chemical Technology

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2016

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tom Vol. 18, nr 4

41--46

EN

The main purpose of this study was to develop a mathematical model, in a steady state and dynamic mode, of a Catalytic Partial Oxidation (CPOx ) reformer – Solid Oxide Fuel Cell (SOFC) stack integrated system in order to assess the system performance. Mass balance equations were written for each component in the system together with energy equation and implemented into the MATLAB Simulink simulation tool. Temperature, gas concentrations, pressure and current density were computed in the steady-state mode and validated against experimental data. The calculated I–V curve matched well the experimental one. In the dynamic modelling, several different conditions including step changes in fuel flow rates, stack voltage as well as temperature values were applied to estimate the system response against the load variations. Results provide valuable insight into the operating conditions that have to be achieved to ensure efficient CPOx performance for fuel processing for the SOFC stack applications.

4

Leaf biomass and leaf area equations for three planted trees in Iran

80%

Eslamdoust J. , Sohrabi H. , Hosseini S. M. , Naseri B.

European Journal of Biological Research

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2017

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tom 07

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nr 1

5

Determination of the best canopy gap area on the basis of soil characteristics using the Analytical Hierarchy Process (AHP)

80%

Kooch Y. , Hosseini S. M. , Mohammadi J. , Hojjati S. M.

Folia Forestalia Polonica. Series A . Forestry

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2012

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tom 54

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nr 1

6

Electrical properties comparison of NTC thermistors prepared from nanopowders and in mixed oxide process

80%

Hosseini S. M. , Ghanbari Shohany B. , Azad N. , Kompany A.

Materials Science Poland

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2011

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tom Vol. 29, No. 4

253--259

EN

We have synthesized and studied the effect of cobalt doping on the electrical properties of NTC thermistors with the composition of NiCoxMn2-xO4 (x = 0.0, 0.4, 0.8, 1.2, 1.6). The electrical properties of NTC thermistors prepared from nanopowders by gel auto-combustion and mixed oxides processes have been compared. The measurement results indicate that the fluctuations of B value in the samples made from nanopowders are smaller than that in the samples prepared using mixed oxides method. The electrical properties of these ceramics depend strongly on their grain size. The sintering time and temperature were chosen the same for the samples made from the powders prepared by the two methods. It was found that the samples made from nanopowders have smaller grain sizes.

7

Effect of bee pollen and propolis (bee glue) on growth performance and biomarkers of heat stress in broiler chickens reared under high ambient temperature

80%

Hosseini S. M. , Vakili Azghandi M. , Ahani S. , Nourmohammadi R.

Journal of Animal and Feed Sciences

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2016

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tom 25

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nr 1

EN

This study investigated the supplemental effects of bee pollen (BP) and propolis (bee glue; BG) on broiler performance, intestinal morphometry, haematological profile and biomarkers of heat stress in broilers reared under high ambient temperature. Two hundred and forty one-day-old male broiler chickens were divided into 4 treatment groups: control; BP – supplemented with 20 g of BP · kg–1 of feed; BG – supplemented with 3 g of BG· kg–1 of feed; and BP+BG – supplemented with 20 g of BP · kg–1 + 3 g of BG · kg–1. It was estimated that dietary BP and BG improved average daily gain and average daily feed intake of broilers particularly during the starter period (P < 0.05). The relative weights of spleen and bursa of Fabricius were higher in groups fed supplemented diets when compared to the control group (P < 0.05). Biomarkers of heat stress including the circulating heterophil:lymphocyte ratio, creatine kinase level and mRNA expression of 70 kD heat shock protein (HSP70) levels in breast muscle were decreased in supplemented birds. In birds fed diets with BP and BG addition, crypts were deeper and villus:crypt ratios were higher in the jejunum segment (P < 0.05). The obtained results suggest that the dietary use of both BP and BG as a feed additive may offer a practical nutritional strategy in high temperature environment to prevail the harmful effects of heat stress in broiler.

8

A comparison of distance sampling methods in Saxaul (Halloxylon ammodendron (C.A. Mey Bunge) shrub-lands

70%

Kiani B. , Fallah A. , Tabari M. , Hosseini S. M. , In Parizi M.-H.

Polish Journal of Ecology

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2013

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tom Vol. 61, nr 2

207--219

EN

The primarily goal of plot-less sampling methods is to reduce costs and rapid survey of plant communities. First full inventory was conducted in two 30-ha sites of Saxaul populations geo-morphologically different. In first site (site I), population had random pattern while in second site (site II) clumped pattern was observed. Crown diameters and spatial situation of all trees were recorded using distance and azimuth. Data were transferred to computer and stem map was generated with ArcGIS Software. Distance sampling methods include point-centred quarter method (PCQ), joint-point method (JP), Random pairs method (RP), T-Square method (T-Sq) and Quartered neighbour methods beside fixed area plot (FAP), n-tree and variable area transect (VAT) methods were conducted on generated stem maps. A time study was done aiding indices determined in field works. In site I, point centred quarter estimator with measurements to the second closest individual in each quadrant had the lowest relative bias (RBIAS) in estimating density followed by 3-tree and closest individual methods. In clumped pattern (site II), variable area transect method with measurements to the 4th and 5th closest individuals in each transect brought the best results. The most time consuming methods after fixed area plot, were point centred quarter estimators while methods considering measurement to the closest individual were rapid. Considering RBIAS and Time together, VAT method was the best sampling method in clumped pattern followed by point centred quarter estimator with measurements to the second closest individual in each quadrant and closest individual estimators. In random pattern, point centred quarter estimator with measurements to the second closest individual in each quadrant was the best method followed by 3-treeandclosest individualestimators. But for estimating cover per unit area N-tree methods performed well. As in this site, VAT method located in 4th grade, and due to simplicity of field works related to this method, in the case that the investigator would not be able to clearly define spatial pattern of the population, this method can be recommended as well.

9

Growth and nutrition of restored Quercus castaneifolia C.A. Mey. versus native Celtis australis L. tree species: conservation perspectives of Hyrcanian forest (Iran)

70%

Hosseini S. M. , Raouhi-Moghaddam E. , Ebrahimi E. , Rahmani A. , Tabari M.

Polish Journal of Ecology

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2010

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tom 58

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nr 1

EN

For native species, mixed plantation systems seem to be the most appropriate for providing a broader range of options such as production, protection, biodiversity conservation and restoration. After 11 years, growth and nutrition and soil properties were examined in young plantation of two indigenous tree species in Hyrcanian forests of Iran. Quercus castaneifolia C.A. Mey. (as target species) and Celtis australis L. (as native component species) were planted in five proportions (100Q, 70Q:30C, 60Q:40C, 50Q:50C, 40Q:60C) in Noor, Iran. Diameter at breast height of individual Quercus trees and total basal area were affected by the presence of Celtis. Percent retranslocation of nutrients in Quercus followed in order: K> P> N. Leaf-litter fall production ranged from 4.10 to 6.14 t ha⁻¹ year⁻¹. Ca and Mg concentrations in fully expanded leaves of Quercus, N and K retranslocation of Quercus, concentration of available P in soil were higher in some of the mixed plantations than in monoculture of Quercus. On the other hand, N concentration in fully expanded leaves of Quercus, N fluxes and soil C/N ratio were higher in monoculture of Quercus. Within the framework of this experiment, it appeared that production was maximized when these two species were grown together in the proportion of 60% Quercus and 40% Celtis.

10

A comparison of distance sampling methods in saxaul (Halloxylon ammodendron C.A. Mey Bunge) shrub-lands

70%

Kiani B. , Fallah A. , Tabari M. , Hosseini S. M. , In Parazi M.-H.

|

tom 61

|

nr 2

EN

The primarily goal of plot-less sampling methods is to reduce costs and rapid survey of plant communities. First full inventory was conducted in two 30-ha sites of Saxaul populations geo-morphologically different. In first site (site I), population had random pattern while in second site (site II) clumped pattern was observed. Crown diameters and spatial situation of all trees were recorded using distance and azimuth. Data were transferred to computer and stem map was generated with ArcGIS Software. Distance sampling methods include point-centred quarter method (PCQ), joint-point method (JP), Random pairs method (RP), T-Square method (T-Sq) and Quartered neighbour methods beside fixed area plot (FAP), n-tree and variable area transect (VAT) methods were conducted on generated stem maps. A time study was done aiding indices determined in field works. In site I, point centred quarter estimator with measurements to the second closest individual in each quadrant had the lowest relative bias (RBIAS) in estimating density followed by 3-tree and closest individual methods. In clumped pattern (site II), variable area transect method with measurements to the 4th and 5th closest individuals in each transect brought the best results. The most time consuming methods after fixed area plot, were point centred quarter estimators while methods considering measurement to the closest individual were rapid. Considering RBIAS and Time together, VAT method was the best sampling method in clumped pattern followed by point centred quarter estimator with measurements to the second closest individual in each quadrant and closest individual estimators. In random pattern, point centred quarter estimator with measurements to the second closest individual in each quadrant was the best method followed by 3-tree and closest individual estimators. But for estimating cover per unit area N-tree methods performed well. As in this site, VAT method located in 4th grade, and due to simplicity of field works related to this method, in the case that the investigator would not be able to clearly define spatial pattern of the population, this method can be recommended as well.

11

Effect of Y3+ and Nb5+ co-doping on dielectric and piezoelectric properties of PZT ceramicsn

70%

Zak A. K. , Jalalian A. , Hosseini S. M. , Kompany A. , Shekofteh Narm T.

Materials Science Poland

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2010

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tom Vol. 28, No. 3

703--708

EN

The effect of co-doping of Pb1-xYx[(Zr0.53Ti0.47)1-xNbx]O3 bulk materials (0 ? x ? 0.03) with Y3+ ions and Nb5+ on their dielectric and piezoelectric properties o was investigated. Samples fabricated by conventional oxide mixing (OM) were sintered at 1250 °C for 2 h in a Pb-rich atmosphere. During the tetragonal-rhombohedral transition in the doped PZT ceramics a negligible effect was observed after additions of Y3+ and Nb5+ ions. The co-doping with both ions was noted to inhibit grain growth and promote densification and electrical properties. The optimal doping level was found to be at x = 0.015, for which the electric permittivity of 907, the piezoelectric constant of 323 pC/N, g33 of 40 mV/N, Qm of 272 and the electromechanical coupling factor (kp) of 0.49 were obtained.

12

Optimal method to determine density of the scarce vegetation in dry desert: variable area transect (VAT) applied to saxaul (Haloxylon ammodenderon) community

70%

Kiani B. , Tabari M. , Fallah A. , Hosseini S. M. , Iran Nejad Parizi M.-H.

Polish Journal of Ecology

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2011

|

tom 59

|

nr 4

EN

The assessment of the density and cover of very scarce vegetation in dry habitats may create methodological problems. The variable area transect method (VAT ) is a potential labour-saving sampling method and an alternative to plot (quadrate) method. It allows for density estimation without the time-consuming studies associated with other plot-less density estimators. We used the method in a natural shrubland of Saxaul (Haloxylon ammodenderon C.A.M) to define optimum parameters include transect width and individual’s number to which, distance is measured. Three transect widths were chosen, 10-m, 15-m and 20-m and distances to the 3rd, 4th and 5th individual. Transect width affected the estimation, a 20-m width transect had the least relative bias (–0.5%), and a 10-m width sampling had the greatest bias (–20%). However, all methods underestimated the plant density. The most accurate estimation was with the 3rd plant distance and 20-m transect. As the VAT method is more efficient per unit effort in the field than the quadrate methods, it can be recommended for rapid assessment of desert communities density (like saxaul) especially when plants are dispersed at random.

13

Neuroprotective effects of lipopolysaccharide and naltrexone co‑preconditioning in the photothrombotic model of unilateral selective hippocampal ischemia in rat

61%

Hosseini S. M. , Golaghaei A. , Nassireslami E. , Naderi N. , Pourbadie H. G. , Rahimzadegan M. , Mohammadi S.

Acta Neurobiologiae Experimentalis

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2019

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tom 79

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nr 1

EN

Preconditioning with lipopolysaccharide (LPS) or opioid antagonists has a neuroprotective effect in ischemic insults. However, the co-preconditioning effect of toll-like receptor ligands and opioid antagonists has not been investigated. In this study we examined the neuroprotective effect of LPS and naltrexone (NTX) preconditioning and co-preconditioning in unilateral selective hippocampal ischemia in rats to assess for possible synergistic protective effects. LPS and NTX were injected unilaterally into the left cerebral ventricle of male rats. Forty-eight hours after LPS and twenty-four hours after NTX injection, ipsilateral selective hippocampal ischemia was induced using a modified version of the photothrombotic method. Protective effects for LPS and NTX were assessed by evaluating infarct volume (using 2,3,5-triphenyltetrazolium chloride staining), and cognitive function (using radial arm water maze and passive avoidance tests). Animals in the ischemic group had an infarct lesion and considerable cognitive impairment, compared with the sham group. LPS or NTX preconditioning significantly reduced the infarct size and improved cognitive function. Moreover, co-preconditioning with LPS and NTX increased the protective effect compared with preconditioning with LPS or NTX alone. Our data showed that LPS and NTX preconditioning resulted in a neuroprotective effect in hippocampal ischemia. Furthermore, co-preconditioning with LPS and NTX resulted in a synergistic protective effect.

14

The effects of Viscum album L. on foliar weight and nutrients content of host trees in Caspian forests [Iran]

61%

Hosseini S. M. , Kartoolinejad D. , Mirnia S. K. , Tabibzadeh Z. , Akbarinia M. , Shayanmehr F.

Polish Journal of Ecology

|

2007

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tom 55

|

nr 3

EN

Caspian forests (in the region it is called – Hyrcanian Forests) with an area of about 1.9 million ha are located in north of Iran, in southern coast of Caspian Sea. It is exclusive site for some valuable species like Populus caspica Bornm., Gleditsia caspica Desf., Parrotia persica Meyer. and Pterocaria fraxinifolia (Lam.) Spach., and the forests are dominated by Fagus orientalis Lipsky, Quercus castanifolia C. A. M., and Alnus glutinosa Gaertn. The mistletoe (Viscum album L.) effects on the area and weight of leaves of the two host tree species ( hornbeam Carpinus betulus L. and ironwood Parrotia persica Meyer.) were studied on a number of severely infected individuals and control trees in selected parts of Hyrcanian Forests. Almost 100 leaves from infested and non-infested branches of two host species were sampled in order to compare with control trees (non-infested trees growing near each host). Results showed, that area and weight of leaves taken from infested branches of ironwood were significantly lower (at 95% confidence level) than leaf area and weight in non-infested branches and control trees. The amount of K, Mn and Zn was higher in infested branches of both species compared to control trees. However, the amount of nitrogen in infected branches of ironwood was lower. The results suggest that V. album may have detrimental effect on leaf structure, physiology and chemical composition of strongly infested host trees.