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Issue Info: 
  • Year: 

    2024
  • Volume: 

    45
  • Issue: 

    1
  • Pages: 

    1-15
Measures: 
  • Citations: 

    0
  • Views: 

    1
  • Downloads: 

    0
Abstract: 

Longevity plays a significant role in determining an animal's overall health. Nutrition is a key factor that can influence an animal's longevity. Studying the relationship between wing symmetry and longevity provides a useful approach to understanding how nutrition can affect both longevity and symmetry. The effect of Pomegranate Juice (PJ) and Pomegranate Peel (PP) on longevity and FLUCTUATING ASYMMETRY (FA) of wings in male and female Drosophila melanogaster was analysed using Geometric Morphometric Analysis (GMA). The study revealed that PJ and PP-treated flies showed increased longevity and the highest FA compared to control in both males and females. Between PJ and PP-treated flies, PJ had the highest longevity in both males and females whereas PP flies had higher FA in both sexes. Between the sexes, females had lower longevity and FA values compared to males. Overall GMA study reveals shape variation for wings and the presence of a strong FA in PJ and PP flies. Pearson correlation revealed a strong positive association between longevity and wing FA.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2017
  • Volume: 

    70
  • Issue: 

    1
  • Pages: 

    21-29
Measures: 
  • Citations: 

    0
  • Views: 

    916
  • Downloads: 

    0
Abstract: 

This study was conducted to investigate the devastating impact of Mistletoe (Viscum album L.) on ASYMMETRY index and leaf characteristics of Ironwood (Parrotia persica DC.) in Tamishan Forest, Noor, Iran. For this purpose, 20 Ironwood trees were selected inside and outside of the forest. The results showed that the highest and lowest values of leaf area and specific leaf area were observed in healthy and infected trees, respectively, both inside and outside of the forest. Stomatal characteristics of diameter, area and density also varied depending on location of trees and branch types (healthy or infected). Analysis of variance (ANOVA) indicated that the effect of left or right sides of leaves (sides) and trees were significant, while the interaction between side´trees was not significant. The difference between left and right sides of leaves were also significantly affected by location of trees and branches types. Generally, this study showed that the presence of mistletoe influenced the ASYMMETRY index and have been caused to changes in the morphology of the infected trees. Finally, due to nutrition importance of Viscum album for animal to prevent from death of host trees, mechanical removing of Viscum album from host trees with high density is recommended.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

Issue Info: 
  • Year: 

    2019
  • Volume: 

    8
  • Issue: 

    -
  • Pages: 

    0-0
Measures: 
  • Citations: 

    1
  • Views: 

    51
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    1391
  • Volume: 

    17
Measures: 
  • Views: 

    424
  • Downloads: 

    0
Abstract: 

اثرات بیولوژیکی میدان های الکترومغناطیسی قوی و ضعیف بر مگس های سرکه (Drosophila melanogaster) موضوع بسیاری از مشاجرات علمی بوده است. برخی بر اثرات تراتوژنیک و برخی بر اثرات موتاسیون زای چنین میدان هایی تاکید داشته اند. در مطالعه حاضر مگس های والد برای سه نسل متوالی تحت تاثیر میدان الکترومغناطیسی متناوب 0.1 میلی تسلا حاصل از یک همهولتز کویل قرار گرفتند تا اثرات میدان را بر نوسانات عدم تقارن (FLUCTUATING ASYMMETRY) قالب (shape) بال های چپ و راست این حشرات بررسی کنیم. منظور از نوسانات قالب بال کلیه تغییرات جزیی در تقارن دو بال خواهد بود که در قالب بال انتظار داریم تحت شرایط استرس زا رخ داده باشد...

Yearly Impact:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2011
  • Volume: 

    16
  • Issue: 

    8
  • Pages: 

    1055-1061
Measures: 
  • Citations: 

    0
  • Views: 

    384
  • Downloads: 

    193
Abstract: 

BACKGROUND: There are controversial evidences on the association between fingerprint traits and schizophrenia. We compared fingerprint traits of patients with schizophrenia and normal individuals in Iranian population.METHODS: Finger tip dermal ridge of 290 patients with schizophrenia and 290 normal subjects were studied for four dermal traits. Data was analyzed with Pearson correlation and student's tests.RESULTS: Finger print patterns and secondary creases were not significantly different between the two groups (p>0.05).Although mean ridge counts of left and right index fingers of the case group were greater than the control group (p<0.05), these differences were not significant in females.CONCLUSIONS: Probably the left index ridge counts and FLUCTUATING ASYMMETRY in schizophrenic patients are different from those of the normal population. This difference may serve as a diagnostic biological marker for screening people susceptible to schizophrenia. Further studies are needed to determine predictive value of fingerprint trait as a biomarker for the schizophrenia.

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Author(s): 

Tavabi Ehsan | Zeighami Sima

Issue Info: 
  • Year: 

    2025
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    1-11
Measures: 
  • Citations: 

    0
  • Views: 

    20
  • Downloads: 

    0
Abstract: 

The solar corona has a temperature equivalent to one million degrees Kelvin. The very high temperature of this region indicates that this region is heated to this extent by a source other than the heat emitted from the photosphere. It is thought that the energy required to heat the solar corona is provided by the very turbulent flows of the convection layer located below the photosphere, which is proposed to explain how the two types of mechanisms are different. The first mechanism includes wave heating and describes the formation of sound waves, gravity waves and magnetic hydrodynamic waves due to the presence of turbulent and turbulent currents. After being produced, these waves go up and when they hit the solar corona, they disintegrate and release energy in the form of thermal energy. The second mechanism includes magnetic heating, in which magnetic energy is continuously created by the currents in the photosphere and is released towards magnetic regions and sunspots in the form of flares and huge solar flares. In this research, using the time series taken by the IRIS telescope, different regions of the solar disk in 4 filters C II, Si IV, Mg II h and k (1330, 1400, 2796 and 2832 Å) are investigated. The morphology and displacement of magnetic bright points can be described as convective turbulence caused by super-granular flows from the center to the edge. The purpose of this research is to find out the FLUCTUATING morphology of the bright points in the border regions of the network and inside the network. The intensity-time graphs clearly show the coherence of the fluctuations, which is because of the common origin of these fluctuations, which are created with similar periods. Also, the wavelet analysis of intensity fluctuations showed that the frequency of fluctuations is from 2.5 to 12 minutes. Also, to investigate the wave propagation in these layers, the correlation between the chromosphere and the transition region was investigated. Due to the difference in the height of the chromosphere layer and the transition region, and the time delay obtained from the intensity fluctuations between the two mentioned layers, the wave speed was determined with an approximate value of 150 km  s-1. Examining the captured images shows that their source lies in the bright points of the chromosphere. Many jets reach a temperature of at least 105 K and form an important part of the transition region structure. They are likely an intermittent but continuous source of mass and energy for the solar wind.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

Issue Info: 
  • Year: 

    2022
  • Volume: 

    13
  • Issue: 

    49
  • Pages: 

    27-50
Measures: 
  • Citations: 

    0
  • Views: 

    152
  • Downloads: 

    54
Abstract: 

There are views on the influence of Islam on science in Islamic civilization. Among the viewpoints that believe in influence, issues are raised, one of which is the extent of influence and the other is the type and quality of this influence in terms of uniformity and fluctuation. In the issue of the extent of influence, we have two viewpoints with maximum differences, one is reductionist and the other is expansionist,however, despite the serious difference in the issue of scope, these two viewpoints agree on the issue of the type of the effect. That is to say, both views have seen the level of influence as uniform, which can be called the "view of uniformity". The reductionists, with a uniform view, have always considered the role of Islam on the sciences of Islamic civilization as merely motivational and encouraging, and the developmentists, with a holistic view, have always considered the sciences realized in Islamic civilization as an essential part of the Islamic program. Based on the findings of this research, the influence of Islam as a comprehensive theoretical school in the sciences of Islamic civilization is uneven, and it can be accepted as an independent variable.

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Author(s): 

Issue Info: 
  • Year: 

    2023
  • Volume: 

    17
  • Issue: 

    3
  • Pages: 

    75-91
Measures: 
  • Citations: 

    0
  • Views: 

    66
  • Downloads: 

    2
Abstract: 

Different types of energy dissipators are used to reduce the excess kinetic flow energy downstream of the spillways. The flow characteristics of submerged jumps differ significantly from those of free jumps. It was observed that the mixing of the flow jet decreases with the increase in the submergence of hydraulic jumps. This leads to reduced energy dissipation compared to free jumps. Pressure fluctuations in energy-dissipator structures are caused by the FLUCTUATING nature of hydraulic jumps, which are caused by strong eddies and water-air mixing. Therefore, the identification and measurement of hydrodynamic pressures on the bottom of stilling basins play a significant role in the design of the thickness of the bottom slab and the determination of effective forces. Most of the research have been carried out in the field of hydrodynamic pressures of free hydraulic jumps in stilling basins with rough bed downstream of sluice gates. However, few studies are found in the literature regarding the effect of chute blocks and the end sill of the stilling basin on the bottom pressure fluctuations downstream of the spillways for different values of the initial Froude number and the submergence ratio in hydraulic jumps. This research aims to understand the mechanism of pressure fluctuations and determine the coefficient of pressure fluctuations intensity (C'P) of hydraulic jump at the bottom of USBR Type I (smooth bed) and Type II stilling basins, including chute blocks and end sill, at the downstream of the spillway. In this paper, the C'P coefficient on the bottom of USBR stilling basins was evaluated based on the experimental data. Several experiments were carried out in the hydraulic laboratory flume of the University of Tabriz to collect data. The geometric dimensions of an Ogee spillway and stilling basins were designed based on USBR criteria. Based on this, the length of Type I (LI) and Type II (LII) basins for the maximum flow discharge (Qmax) was calculated as 200 and 125 cm, respectively. Experiments were performed at different flow discharges varying ratios of submergence (S=Yt/Y2) equal to 1 (for free jump), 1.05, 1.1, 1.2, 1.3, and 1.4, respectively. The values of initial Froude numbers (Fr1) for different flow discharges were calculated in the range of 7.12 to 9.46. Therefore, in the present research, the range of relatively high values of Fr1 was investigated. Pressure transducers were used to measure FLUCTUATING pressure data, which could record instantaneous pressure values at different times and provide the time series of pressure at for each pressure taps. The pressure transducers were calibrated for the pressure load range of ‒100 to +100 cm, and their nominal measurement accuracy is ±0.5%. The data acquisition frequency of the pressure transducers was 20 Hz, and the duration of data collection was 90 seconds for each pressure taps in each experiment. The number of pressure taps was equal to 25 points. Each pressure tap was connected to the corresponding pressure sensor using a hose with a diameter of 3 mm. The results showed that the maximum values of the CʹP coefficient occur in the initial zone of basins. In free jumps, CʹPmax values in the basinI were located in the range of 15 ≤ ΓX ≤ 20, and in the basinII in the range of ΓX ≤ 15. The variation trend of free jumps showed that in the zone of ΓX ≤ 10 of the basinI and basinII, CʹP coefficient values increase by 49% and 36% on average, respectively, by decreasing the Fr1 parameter. The rate of increase in CʹP coefficient values in free jumps with the reduction of the Fr1 parameter in the zone of ΓX > 10 in basinII was somewhat higher than basinI. In the upstream location of submerged jumps, the CʹP coefficient increased as the Fr1 parameter decreased. The increase of the CʹP coefficient with the decline of the Fr1 parameter in submerged jumps for the upstream zone of basinI and basinII was calculated to be equal to 7 and 4.8 percent, respectively. In the area of ΓX > 10 in the basinII, depending on the degree of submergence of the jump, the values of the coefficient CʹP ranged from 62 to 77% with the decrease of the Fr1 parameter. The variations of the CʹP coefficient in the downstream area of basinI were somewhat similar to basinII. The values of the CʹP coefficient in the upstream zone of the basins for higher Froude numbers were higher in submerged jumps than in free jumps. It seems that the turbulence intensity of submerged jumps in this zone was higher than free jumps. The results showed that the position of CʹPmax values of free jumps inside the basins is located in the zone of ΓXmax < 22 and ΓXmax < 16, respectively. The mean values of CʹPmax in free jumps of the basinI and basinII were achieved around 0.039 and 0.062, respectively. The reduction of CʹPmax in basinII compared to basinI in free jumps is 38% on average. The values of the CʹPmax coefficient decreased with the increase of Fr1 in free and submerged jumps. As the submergence ratio (S) increased, CʹPmax values decreased in different Froude numbers (Fr1). CʹPmax for the minimum Froude numbers had higher values in free jumps compared to submerged jumps.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    2007
  • Volume: 

    31
  • Issue: 

    B3
  • Pages: 

    345-360
Measures: 
  • Citations: 

    0
  • Views: 

    830
  • Downloads: 

    151
Abstract: 

In this paper, an adaptive detection scheme for FLUCTUATING targets with a swerling I model in AR interference is presented. Since the proposed detector uses more information from the target signal in its structure, it has better performance compared with those detectors which do not use the target amplitude model. Performance improvement of this detector compared with the previously AR model based adaptive detector (ARGLR) is shown by simulation results. Besides, another detector is proposed for the known amplitude situation whose performance can be used as an upper bound for all similar detectors.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    1986
  • Volume: 

    -
  • Issue: 

    -
  • Pages: 

    744-751
Measures: 
  • Citations: 

    1
  • Views: 

    94
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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