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Issue Info: 
  • Year: 

    1392
  • Volume: 

    1
Measures: 
  • Views: 

    420
  • Downloads: 

    0
Keywords: 
Abstract: 

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

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Journal: 

Seed and Plant

Issue Info: 
  • Year: 

    2003
  • Volume: 

    19
  • Issue: 

    2
  • Pages: 

    12-15
Measures: 
  • Citations: 

    1
  • Views: 

    1210
  • Downloads: 

    0
Abstract: 

Six male sterile with four male fertile sorghum, Sorghum bicolor(L.) Moench, LINES were crossed in a factorial mating design in 1998. Twenty four F1 hybrids and ten parental LINES were planted in a randomized complete block design in three replications, at Seed and Plant Improvement Institute, Karaj, Iran in 1999. Two cuttings forage were harvested from all genotypes (F12 and parents). Four traits including plant height, tiller no., green yield and dry matter were measured. There were significant differences among genotypes, cuttings and genotype X cutting interaction for all traits at 1% level of probability. Analysis of variance showed that, there are significant effects of genotypes, parent, parent vs. crosses (except for tiller no. at average of cuttings), LINES (for plant height in 2nd cut and mean), testers and line tester interaction. There were differnces among LINES and testers GCA which shows the importance of additive effects of genes for this traits, therefore, the selection METHODs can be used for breeding programmes. Heretiability of some traits were different in first, second and average of cuttings. Therefore, in each cutting, the heretiability should be considered in multi cutting sorghum LINES. Significant differences were observed among SCA of some parents which shows the importance of dominance effects of genes for majority of traits in hybrids. Hence the hybridization METHOD can be used for breeding programmes. The highest positive SVA was obtained for green fodder from crossing of A__ICS 84 × R__2 , A__ICS88005× R__1, A__ICS31×R__28 & A__1×R__112, and for dry matter from crossing of A__ICS88005×R__1, A__ICS__31×R__28, A__2×R__112, A__ISC84×R__112& A__ICS31× R__2 at average of two cutting. The highest yield of two cuttings was obtained for green fodder from crossing of A__ICS84×R__2 and for dry matter from crossing of A__ICS31×R__2 with 144.8 and 34.5 tha^-1 , respecticely.

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

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Issue Info: 
  • Year: 

    1382
  • Volume: 

    5
Measures: 
  • Views: 

    322
  • Downloads: 

    0
Keywords: 
Abstract: 

The main objective of this study is to investigate the phenomenon of water impact underneath the decks of offshore structures due to propagating waves. The decks of offshore structures may be subjected to wave induced loads, which may be not accounted for in the original design. For safe design of offshore platforms, it is important that the hydrodynamic loads and the predicted accurately. In this report, a review of the previous work on this topic with a brief introduction to slamming theory together with a proposed procedure to predict the water impact underneath the decks of floating offshore structures will be presented. Meantime, three dimensional hydrodynamic analysis of a semi-submersible in sea waves has been performed by using the direct boundary element METHODs.

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

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Issue Info: 
  • Year: 

    2022
  • Volume: 

    52
  • Issue: 

    4
  • Pages: 

    269-280
Measures: 
  • Citations: 

    0
  • Views: 

    139
  • Downloads: 

    12
Abstract: 

One of the obvious reasons for most disorders in network service provisioning is network path congestion. Congestion avoidance in today's networks is too costly and sometimes impossible. With the introduction of SDN, centralizing the equipment's control plane has become possible. This paper presents an enhanced METHOD named ESV-DBRA to avoid congestion in multi-tenant SDN networks. At first, ESV-DBRA monitors the traffic load and delay of all network paths for each tenant individually. Then, by merging the parameters obtained from the monitoring, the Service Level Agreements (SLA), and a novel proposed cost function, it calculates the cost of the network paths per tenant. As a result, traffic for each tenant is routed through the path/paths at the lowest possible cost from the tenant's perspective. Next, the bandwidth quotas will be calculated and assigned to the tenants over their optimal routes. Afterward, whenever congestion is likely to occur in a path, ESV-DBRA automatically changes the route or bandwidth of the tenants' traffic related to this path to avoid congestion. Related algorithms are also proposed.Eventually, simulations show that the proposed METHOD effectively increases bandwidth utilization by 10.76%.

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

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Author(s): 

mahbobeh fadavi mahbobeh fadavi, fadavi mahbobeh

Issue Info: 
  • Year: 

    2023
  • Volume: 

    2
  • Issue: 

    71
  • Pages: 

    95-109
Measures: 
  • Citations: 

    0
  • Views: 

    61
  • Downloads: 

    0
Abstract: 

The Qur'an contains religious values ​​for the advancement of man to happiness. The claim is that Quranic teachings are the basis of religious values; By choosing it better, the METHOD of proving religious beliefs can be extracted. This research tries to extract the METHOD of proving religious beliefs with a business approach and by using artistic forms with a descriptive and analytical METHOD and with a better selection of Quranic teachings. Based on the verses, the process was defined as the introduction to the institutionalization of religious values ​​in the businessman 1- Gaining self-knowledge (knowing the talents, capacities, existential dimensions and position of man in the universe); 2- Gaining monotheistic insight (knowing the origin and your relationship with the Creator); 3- Reciprocity is (knowing the destination and drawing the path of happiness in the universe). After the realization of these three stages, the beliefs must be proven through rational and scientific reasoning and penetrate, in this case, the acceptance of good qualities in the businessman will be facilitated.

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

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Issue Info: 
  • Year: 

    2024
  • Volume: 

    13
  • Issue: 

    25
  • Pages: 

    3-32
Measures: 
  • Citations: 

    0
  • Views: 

    15
  • Downloads: 

    0
Abstract: 

In this research, in order to investigate the effect of the piezoelectric patch which is used as a sensor or actuator in rotating flexible structures such as a helicopter blade, the free vibrations of the rotating rectangular sheet with and without the piezoelectric patch have been presented. First-order shear deformation theory is considered for plate displacement and piezoelectric field. Considering the effect of Coriolis acceleration, centrifugal acceleration and centrifugal in-plane forces, the equations of motion are derived from Hamilton's principle and the electromechanical couple equation is obtained from Maxwell's equation. For piezoelectric, two electrical conditions, open circuit and closed circuit, which are used in sensors and actuators, respectively, have been considered. The equations are discretized with the help of the numerical METHOD of generalized differential squares and the matrices of inertia mass, eccentricity, Coriolis and stiffness matrix are obtained. Natural frequency values for beam and rotating plate have been compared in Abaqus software. Also, the values obtained from the numerical solution in MATLAB have been verified with articles and ABAQUS, which have high accuracy. The effect of parameters such as hub radius, rotation speed, sheet thickness, aspect ratio, piezoelectric patch thickness and applied voltage on the natural frequency of the system has also been investigated.

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

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Author(s): 

Salehi Mehdi | Ahmadi Alireza

Issue Info: 
  • Year: 

    2024
  • Volume: 

    13
  • Issue: 

    25
  • Pages: 

    145-156
Measures: 
  • Citations: 

    0
  • Views: 

    17
  • Downloads: 

    0
Abstract: 

In this article, an attempt has been made to estimate the amount of sound transmission loss in a flat oval channel by applying the approach of statistical energy analysis. Correct estimation of sound transmission loss in an air conditioning channel is of great importance due to the harmful effects of noise pollution in the environment on human health. Simulation with the statistical energy analysis METHOD is a powerful approach to estimate sound and vibration in problems in which we deal with complex and multi-part systems; is considered. In this METHOD, first, a system is divided into several subsystems, and then by writing a matrix equation that includes the energy exchanges between subsystems and energy loss coefficients; It is investigated from the perspective of vibration and sound estimation.On average, the model presented in this research is able to estimate the sound transmission loss in different dimensions of the air conditioning channels according to the experimental results in the accuracy range of ± 2.5 dB. Considering that it seems that the results obtained from modeling with this METHOD are in good agreement with the experimental data; The results of this research can be used as an efficient approach to estimate noise in oval shaped channels stretched in different lengths.

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Author(s): 

hadi asgari hadi asgari | asgari hadi

Issue Info: 
  • Year: 

    2022
  • Volume: 

    1
  • Issue: 

    68
  • Pages: 

    65-82
Measures: 
  • Citations: 

    0
  • Views: 

    85
  • Downloads: 

    0
Abstract: 

The purpose of the current research was to investigate the obstacles to the implementation of school-based management in Iran's educational system based on the interpretive structural modeling approach. The research METHOD was a modeling study. The statistical population of the research was specifically the academic staff members of the university, 25 of whom were purposefully selected from the desired cases. The data collection tool was a researcher-made self-interactive questionnaire. In order to measure and evaluate the validity of the questionnaire, the criterion of content validity was used. The content validity of the questionnaire was 0.96. The data analysis was done with interpretive structural modeling METHOD. The results of the research showed that 9 factors play a role as barriers to school-oriented management. Also, the results showed that financial obstacles (the cost of school-oriented management), socio-cultural obstacles and political obstacles (political focus on schools by the central government) as key independent variables have high influence power and low dependence. Also, the results showed that the lack of belief in the professional competence of school administrators, the lack of infrastructure facilities, the emphasis of upper management on the supervision and control of schools, and the lack of cooperation of local communities with school-based management as the linking variables with the greatest power of influence and the greatest power of dependence. and the centralism in the education system of the country and the lack of legal powers to school managers and staff as dependent variables have high dependency power and low influence power.

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: 

    1399
  • Volume: 

    11
  • Issue: 

    3 (44)
  • Pages: 

    649-663
Measures: 
  • Citations: 

    1
  • Views: 

    177
  • 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: 

    1387
  • Volume: 

    2
Measures: 
  • Views: 

    463
  • Downloads: 

    0
Abstract: 

بهایی که انسان در طول تاریخ برای ماده اولیه حیات پرداخته گاهی بسیار گزاف بوده است، از جمله این موارد زلزله ویرانگر بم در جنوب شرقی ایران است. ارتباط بین گسل های معکوس فعال، آبخوان های بالا آمده ای که ذخیره آب را تهیه می کنند و مکان های تجمع اقوام بشری در نواحی خشکی از جهان مانند ایران شناخته شده می باشد.در نگاهی گذرا به نقشه زمین شناسی ناحیه زلزله زده آبرفت هایی دیده می شود که کل منطقه را پوشانده اند. برای مشخص کردن ساختارهای زمین شناسی زیرسطحی از جمله گسل مسبب زلزله که یک گسل پنهان است روش مگنتوتلوریک می تواند بسیار کارآمد باشد.برای مشخص شدن ساختاراین گسل یک پروفیل MT با امتداد شرقی - غربی و عمود بر راستای گسل آشکار بم - بروات زده شد. مطالعه مقاطع 2D این پروفیل یک زون با مقاومت پایین در عمق 8-2 کیلومتری نشان می دهد که به وضوح دچار گسلش شده است. در اعماق بیشتر زون دیگری با مقاومت پائین تر مشاهده می شود که گسل خوردگی در آن مشاهده نمی شود، این زون به خوبی با عمق پسلرزه های ثبت شده مطابقت دارد شیب نزدیک به قائم گسل پنهان، عمق سنگ کف و وجود مولفه معکوس در گسل آشکار از نتایج این مطالعه است.

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