2019-02-23T15:58:39Z
http://ijsts.shirazu.ac.ir/?_action=export&rf=summon&issue=592
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
Theoretical investigation of local structure distortion and absorption spectra for tetragonal Cr2+ ion in ZnSe:Cr2+ system
X.
Tan
Kang-Wei
Zhou
<span style="font-size: xx-small;">By analyzing the zero-field-splitting parameters and of Cr</span><span style="font-size: xx-small;">2+ </span><span style="font-size: xx-small;">(3d</span><span style="font-size: xx-small;">4</span><span style="font-size: xx-small;">) ion located at tetrahedral site in ZnSe crystal, the local structure distortion and absorption spectra around Cr</span><span style="font-size: xx-small;">2+ </span><span style="font-size: xx-small;">in ZnSe: Cr</span><span style="font-size: xx-small;">2+ </span><span style="font-size: xx-small;">system have been calculated on the basis of the complete energy matrix for the d</span><span style="font-size: xx-small;">4 </span><span style="font-size: xx-small;">configuration within the strong-filed-representation. It is shown that there exists an expansion distortion in the local lattice structure when Cr</span><span style="font-size: xx-small;">2+ </span><span style="font-size: xx-small;">ion is doped into ZnSe crystal. From our calculations, the distortion parameters and are determined. a D 0.20A R 3.4 </span>
Local structure
absorption spectra
strong-filed-representation
ZnSe: Cr2+
2015
11
04
349
354
http://ijsts.shirazu.ac.ir/article_3256_3919dd66aa96b7dca5927785824447b5.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
Iron biofortification and activation of antioxidant system of wheat by static magnetic field
F.
Ghanati
A.
Payez
<span style="font-size: xx-small;">Effect of static magnetic field (SMF) on plants is a matter of debate. In the present study plausible useful effects of SMF on wheat plant (</span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">Triticum aestivum </span></span></em><span style="font-size: xx-small;">L.) via improvement of antioxidant system and iron/ferritin fortification were evaluated. The plants were cultivated in pots and in their reproductive stages were treated with or without a 30 mT SMF for 4 days, each 5h. The activity of antioxidant system, iron and ferritin contents was evaluated. In comparison with the control groups, SMF treatment significantly increased the contents of iron, ferritin, and Fe-bound proteins in edible parts of the plants. Treatment with SMF also significantly increased catalase activity and radical scavenging capacity of wheat seeds which led in turn to decrease of membrane lipid peroxidation. The results provide us with a new approach for application of physical stimulators such as SMF in order for iron biofortification and increase of antioxidant capacity of critical crops. </span>
Bifortification
ferritin
iron
Magnetic field
SMF
Triticum aestivum
2015
11
04
355
360
http://ijsts.shirazu.ac.ir/article_3257_40a57d3c34886d904e3f5e85b3f54d75.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
Pesticidal and pest repellency activities of roots of Laportea crenulata (Gaud.) against Tribolium castaneum (Herbst)
A.
Khan
M.
Hedayetul Islam
M. A.
Alim Al-Bari
M.
Ekramul Islam
M. S.
Parvin
T.
Zaman
M.
Nurul Islam
M. E.
Haque
<span style="font-size: xx-small;">The presence of </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">Tribolium castaneum </span></span></em><span style="font-size: xx-small;">(Herbst) in a stored food results in contamination and substantial economic damage due to loss of the products and a decrease in nutritional value. This study was conducted to determine the pesticidal and pest repellent activities of roots of </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">Laportea crenulata </span></span></em><span style="font-size: xx-small;">Gaud. against </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">T. castaneum</span></span></em><span style="font-size: xx-small;">. Pesticidal activity was determined using surface film method, whereas, filter paper disc method was used to determine the pest repellency property of the plant. Both chloroform and methanol soluble fractions of ethanol extracts of roots of L crenulata were found to possess pesticidal property. High mortality record (77-83% at 24-48 hours exposure duration) for chloroform fraction was found at a dose 1.77mg/cm</span><span style="font-size: xx-small;">2</span><span style="font-size: xx-small;">. On the other hand, methanol fraction showed high mortality records (80-93%) at doses 0.44-1.77 mg/cm</span><span style="font-size: xx-small;">2</span><span style="font-size: xx-small;">, suggesting its superior pesticidal potency. Although, both fractions also showed pest repellency property, chloroform fraction has higher activity than methanol fraction. These results suggests that roots of </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">L. crenulata </span></span></em><span style="font-size: xx-small;">possess both pesticidal and pest repellency activities against </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">T castaneum </span></span></em><span style="font-size: xx-small;">and can be used in controlling pest of grain and flour based products. </span>
Laportea crenulata
ethanol extract
methanol fraction
chloroform fraction
Tribolium castaneum
2015
11
04
361
367
http://ijsts.shirazu.ac.ir/article_3258_5d3c211a166c60a9cbfe4fbbe9442329.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
Scintillation index effects on the bit error rate in free space optical communication of incoherent flat-topped laser beam propagating through turbulent atmosphere
M.
Yousefi
R.
Talatian Azad
F. D.
Kashani
B.
Ghafary
<span style="font-size: xx-small;">In this paper, the effects of scintillation phenomena on Bit Error Rate (BER) and Signal to Noise Ratio (SNR), which are essential characteristics in Free Space Optical (FSO) communication system, are studied. Until now various methods have been introduced to decrease BER and increase the link's reliability. Optimizing SNR is one of the fundamental methods to decrease BER value. Intensity fluctuations variance of laser beam on the receiver optics due to propagation through turbulent atmosphere which is called Scintillation Index is an effective parameter in SNR. Thus, due to the importance of this index in FSO systems, to study the effects of source and turbulence parameters on BER, first the scintillation index of incoherent flat-topped laser beam propagating through turbulent atmosphere is calculated (using Kolmogorov spectrum model). Then, an analytical formula for SNR and so BER based on Log-Normal irradiance distribution function is expressed. With the help of this formula, results of investigations are shown by graphs. Simulations show that scintillation index and source parameters such as modulation methods and order of beam's flatness have a strong effect on SNR and BER. </span>
Bit Error Rate
free space optical communication
log-normal pdf
scintillation index
signal to noise ratio
2015
11
04
369
374
http://ijsts.shirazu.ac.ir/article_3259_7d3f7821e7557238c35f44a5a8f054a9.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
A Novel Differential Evolution based optimization algorithm for Non-Sliceable VLSI Floorplanning
D.
Gracia Nirmala Rani
S.
Rajaram
<br /><span style="font-size: xx-small;">Floorplanning is an important step in physical design of VLSI circuits. It is used to plan the positions of a set of circuit modules on a chip in order to optimize the circuit performance. However, modern floorplanning takes better care of providing extra options to place dedicated modules in the hierarchical designs to align circuit blocks one by one within certain bounding box for helping sequential data transfer (bus or pipeline) signal in the VLSI circuit. In this paper, the placement of circuit blocks with alignment constraints can be handled using B*tree representation with Differential Evolutionary algorithm. In order to reduce the solution space, feasibility conditions of nonslicing floorplan with alignment constraints have been examined. The properties associated with our proposed Differential Evolutionary algorithm provide the way to produce optimal floorplan. Experimental results based on the MCNC benchmark circuits with the alignment constraint shows that our Differential algorithm can produce promising solutions. </span>
CAD VLSI
floorplanning
alignment constraints
differential evolutionary algorithm
2015
11
04
375
382
http://ijsts.shirazu.ac.ir/article_3260_c723752b466907db86ce7c23d4c91f4b.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
Effects of short term fasting and refeeding on some hematological and immune parameters in Mesopotamichthys sharpeyi (Günther, 1874) fingerlings
A.
Najafi
A. P.
Salati
V.
Yavari
F.
Asadi
<span style="font-size: xx-small;">This study investigated the effects of short-term fasting and re-feeding on hematological and immunological parameters of </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">Mesopotamichthys sharpeyi </span></span></em><span style="font-size: xx-small;">(Günther, 1874) fingerlings. After 2 weeks of adaptation, 360 fish with an average initial body weight of 6.13±0.40g were distributed in nine 300-L circular fiberglass tanks provided with aeration system following a completely randomized design. The fish were divided in 3 experimental groups (each in triplicate) that included 4, 8 and 16 days of fasting. After food deprivation periods, fish in all the experimental groups were fed to satiation two times a day for a period of 32 days. Blood samples were collected from 15 fish in each treatment (5 fish from each replicate) at the initial and the end of fasting and also re-feeding periods. Blood samples were collected from the caudal vasculature vein using heparinized syringes. Results showed that the numbers of red blood cells, hemoglobin and hematocrit were significantly lower (P<0.05) in 16-days starved group than the control group. Experimental fish showed no significant change (P>0.05) in the number of white blood cells, though their number increased significantly after refeeding period (P<0.05). Lysozyme and total immunoglobulins of the experimental fish were not affected by fasting and refeeding (P>0.05). The results of the study showed that food deprivation up to 16 days and subsequent refeeding did not have a significant effect on hematologic and immune indices in </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">M. sharpeyi fingerlings. </span></span></em>
Fasting
refeeding
hematology
immune parameters
Mesopotamichthys sharpie
2015
11
04
383
389
http://ijsts.shirazu.ac.ir/article_3261_25b49599435335de491b431f850e61f2.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
Long-term changes in the biological parameters of wild carp (Cyprinus carpio carpio) from the south-eastern Caspian Sea
A.
Vazirzadeh
S.
Yelghi
<br /><span style="font-size: xx-small;">The populations of wild carp (</span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">Cyprinus carpio carpio</span></span></em><span style="font-size: xx-small;">), as a commercially valuable species in the southeast Iranian waters of the Caspian Sea, have been severely declined during last three decades, but there is no comprehensive research available on the biology of this species in this area. The age, growth and reproductive aspects of samples collected during 2009-2010 fishing season were measured and compared with data from previous studies to elucidate changes during the last five decades. The mean total length and weight of sampled carp ranged from 262- 726 mm and 314- 3733 g, respectively. The von Bertalanffy parameters of K and L</span><span style="font-size: xx-small;">∞ </span><span style="font-size: xx-small;">for both sexes were 0.24 year </span><span style="font-size: xx-small;">-1 </span><span style="font-size: xx-small;">and 68.13 cm, respectively. The Gonadosomatic index ranged from 6.61 to 20.12% and 1.2 to 7.11% in female and male samples, respectively. The mean fecundity of fish ranged from 33695 in 4 years carp to 1234567 in 12 years samples with mean of 273 thousand in all fish. The oocyte diameters ranged from 0.69 to 1.53 mm with mean of 1.32 mm. Egg size frequency distribution showed that wild carp has asynchronous ovarian development. Comparing the results from 5 decades ago showed that replacing the gill nets with beech seines has had evident impact on the growth and age-composition of wild carp and the observed asynchronous reproduction strategy should be considered for artificial reproduction programs. </span>
Cyprinus carpio carpio
biology
age
Growth
long-term assessment
south-eastern Caspian Sea
2015
11
04
391
397
http://ijsts.shirazu.ac.ir/article_3262_724c25418a2d17ad8e4010f8ab141457.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
An algorithmic approach for solution of nonlinear Fredholm-Hammerstein integral equations
H.
Saberi Najafi
S. A.
Edalatpanah
H.
Aminikhah
<br /><span style="font-size: xx-small;">In this paper, we present a new computational technique for solving nonlinear Fredholm integral equations of the second kind. This proposed method is based on Galerkin method and is computationally very attractive. Moreover, for reducing the operations in comparing similar works, we design our algorithm based on transformations of orthogonal polynomials in approximation coefficients calculating scheme. Finally, for showing the reliability and efficiency of this method, we use some numerical examples. </span>
Nonlinear Fredholm integral equation
Hammerstein equations
Galerkin method
Legendre
polynomials
Trial space
Taylor expansion
2015
11
04
399
406
http://ijsts.shirazu.ac.ir/article_3263_a23a04125a0754601efd386193212582.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
On the existence of solutions for a class of systems of functional integral equations of Volterra type in two variables
R.
Allahyari
R.
Arab
A.
Shole Haghigh
<br /><span style="font-size: xx-small;">The aim of this paper is to show how some measures of noncompactness in the Banach space of continuous functions defined on two variables can be applied to the solvability of a general system of functional integral equations . The results obtained generalize and extend several equations . An illustrative example is also presented . </span>
Measure of noncompactness
modulus of continuity
system of integral equations
2015
11
04
407
415
http://ijsts.shirazu.ac.ir/article_3264_08c13435f010f1c56eef693fa6c35be3.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
Some notes on the topological centers of module actions
K.
Haghnejad Azar
A.
Bodaghi
A.
Jabbari
In this paper, we extend some propositions of Banach<br />algebras into module actions and establish the relationships between<br />topological centers of module actions. We introduce some newconcepts as <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /><br /> <br />-property and <br /> <br />-property for Banach modules and obtain some conclusions in<br />the topological center of module actions and Arens regularity of Banach<br />algebras.
Arens regularity
bilinear mappings
factorization
module action
second dual
topological center
2015
11
04
417
431
http://ijsts.shirazu.ac.ir/article_3266_3f910c51c66e3b04a249157655579762.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
Nanofluid flow and heat transfer over a stretching porous cylinder considering thermal radiation
M.
Sheikholeslami
M. T.
Mustafa
D. D.
Ganji
<span style="font-size: xx-small;">The aim of the present paper is to study the Cu-water nanofluid flow and heat transfer characteristics of a stretching permeable cylinder. Thermal radiation effect is considered in energy equation. The governing partial differential equations with the corresponding boundary conditions are reduced to a set of ordinary differential equations with the appropriate boundary conditions using similarity transformation, which is then solved numerically by the fourth order Runge–Kutta integration scheme featuring a shooting technique. Numerical results for the flow and heat transfer characteristics are obtained for various values of the nanoparticle volume fraction, suction parameter, Reynolds number and radiation parameter. The results show that skin friction coefficient increases with increase of Reynolds number and suction parameter but it decreases with increase of nanoparticle volume fraction. Nusselt number is an increasing function of nanoparticle volume fraction, Reynolds number and suction parameter but it is a decreasing function of radiation parameter. </span>
Thermal radiation
nanofluid
boundary layer
stretching cylinder
heat transfer
porous media
2015
11
04
433
440
http://ijsts.shirazu.ac.ir/article_3267_86323d98e5ed934a58ba0f10b3aae46b.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
Determination of radiosensitive organs in head CT for the head area
M.
Mahdavi
M.
Hosseinnezhad
M.
Vahabi Moghaddam
<span style="font-family: 'Times New Roman','serif'; font-size: 9pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA; mso-bidi-font-weight: bold;">Computed Tomography<br />represents about 10% of all diagnostic radiology procedures, but it is<br />responsible for almost 50% - 60% of exposure from diagnostic procedures. In<br />head CT, other critical organs such as eye lenses and thyroids are in the<br />radiation field. Therefore, dose assessment in these organs is very important.<br />The aim of this study is to estimate the absorbed dose in critical organs of<br />patients undergoing common head CT scans. In this study, the Radiosensitive<br />organs in CT were determined in Razi hospital in Rasht, the capital of Gilan<br />province in Iran. The standard head phantom that was built from ertalon and cheap<br />termolominecene dosimeter LiF; Mg: Cu; P was used for dosimetry in organs.<br />Height and diameter of the phantom which contained holes for placing the TLD<br />were 32 cm and 16 cm, respectively. Readouts were obtained on a Harshaw reader.<br />The results show that during head CT scan, the maximum absorbed dose belongs to<br />occipital bone skin, that is 15.2mGy, and the minimum absorbed dose belongs to<br />the neck, which is 0.13 mGy. For reduction of damage due to exposure in CT, it<br />is necessary that the absorbed dose of organs be decreased.</span>
Aabsorbed dose
computed tomography
radiation
radiosensitive
termolominecene dosimeter
2015
11
04
441
444
http://ijsts.shirazu.ac.ir/article_3268_d8aa70eb1802e71da454fc79e77a3d6b.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
Study the heat dissipation performance of horizontal battery pack
X.
Xiaoming
T.
Wei
J.
Haobin
G.
Ran
<br /><span style="font-size: xx-small;">Battery pack is the main energy storage element, and directly affects the performance of electric vehicle. This paper selects the forced air cooling of horizontal battery pack as the study object, and researches the heat dissipation performance of different operating conditions with FLEUNT software. Results indicate that: according to the four kinds of transient state conditions and steady state condition, the temperature rising of horizontal battery pack is significantly higher than the temperature difference; when the electric vehicle beginning to decrease speed, the curve of temperature rising and temperature difference rise, it shows that the internal heat continuously rising up, so even the electric vehicle beginning to decrease speed, the fan must work. Then the reference basis for heat flow field characteristic analysis of horizontal battery pack is offered. </span>
Electric vehicle
heat dissipation performance
battery pack
operation conditions
transient state
steady state
temperature rising
temperature difference
2015
11
04
445
453
http://ijsts.shirazu.ac.ir/article_3269_603089291d9a08adcdea120830268ad2.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2015
39
3.1
An efficient method for solving strongly nonlinear oscillators: combination of the multi-step homotopy analysis and spectral method
S. M.
Hosseini Harat
E.
Babolian
M.
Heydari
<span style="font-size: xx-small;">In this study, a new efficient semi-analytical method is introduced to give approximate solutions of strongly nonlinear oscillators. The proposed method is based on combination of two different methods, the multi-step homotopy analysis method and spectral method, called the multi-step spectral homotopy analysis method (MSHAM). In this method, firstly, we propose a new spectral homotopy analysis method and then, we apply it on smaller subintervals and join the resulting solutions that obtained from new spectral homotopy analysis method at the end points of the subintervals. Several significant strongly nonlinear oscillators are tested with the new scheme to demonstrate its accuracy and easy implementation. </span>
Homotopy analysis method (HAM)
Spectral method
spectral HAM (SHAM)
multi-step HAM
nonlinear oscillator
Runge-Kutta method
2015
11
04
455
462
http://ijsts.shirazu.ac.ir/article_3270_87d3c82282f5988b6bb326622909c53d.pdf