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Search Results: 1 - 10 of 8184 matches for " Ahmad GHANBARI "
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Intercropping of Maize (Zea mays) and Cowpea (Vigna sinensis) as Whole-Crop Forage: Effect of Different Planting Pattern on Total Dry Matter Production and Maize Forage Quality
Hamdollah ESKANDARI,Ahmad GHANBARI
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2009,
Abstract: Mixtures of cereals and legumes are used extensively for forage production. Maize (Zea mays) and cowpea (Vigna sinensis) monocultures as well as their mixture in three planting patterns (M1: alternate-row intercrop, M2: within-row intercrop, M3: mixed intercrop) were used to investigate on forage yield as well as the effect of intercropping on maize forage quality. The experiment was carried out as randomized complete block design with three replications. The results showed that intercropping systems had a significant effect on forage dry weight, where dry matter yield was increased by intercropping as compared with maize and cowpea sole crops. It was related with a higher consumption consumption of environmental resources, such as photosynthetically active radiation and soil moisture, by intercropping. Maize forage quality in terms of crude protein was improved by intercropping. It was because of more nitrogen availability for maize in intercropping compared with its sole crop.
Optimal Trajectory Planning For Design of a Crawling Gait in a Robot Using Genetic Algorithm
Ahmad Ghanbari,SMRS. Noorani
International Journal of Advanced Robotic Systems , 2011,
Abstract: This paper describes a new locomotion mode to use in a crawling robot, inspired of real inchworm. The crawling device is modelled as a mobile manipulator, and for each step of its motion, the associated dynamics relations are derived using Euler-Lagrange equations. Next, the Genetic Algorithm (GA) is utilized to optimize the trajectory of the free joints (active actuators) in order to minimize the consumed effort (e.g. integral of square of torques over the step time). In this way, the results show a reduction of 5 to 37 percent in torque consumption in comparison with the gradient based method. Finally, numerical simulation for each step motion is presented to validate the proposed algorithm.
Explicit Dynamic Formulation for n-R Planar Manipulators with Frictional Interaction between End-effecter and Environment
SMRS. Noorani,Ahmad Ghanbari
International Journal of Advanced Robotic Systems , 2011,
Abstract: analysis of the planar manipulators which consist of n revolute joints and its end‐effecter may possess a frictional contact with an arbitrary surface. The dynamic analysis has been done by using the Lagrangian method. The main contribution of this work is presenting the equations of motion of the system in an explicit and straightforward manner. To this end, the absolute angles of the links are chosen as the generalized coordinates to constitute the Lagrangian, and by this way the Coriolis acceleration terms included the product of the joint velocities, will be hidden in structure of the equations of motion. It is very interested in the simplified results that show a clear conformity with the interpretations of the Euler's equation of motion of the rigid body. In following, the results are applied to a case study model to explain the deriving the equations of motion by our formulation. An inchworm robot included an articulated mechanism is considered to this end.
Effect of different Planting Pattern of Wheat (Triticum aestivum) and Bean (Vicia faba) on Grain Yield, Dry Matter Production and Weed Biomass
Hamdollah ESKANDARI,Ahmad GHANBARI
Notulae Scientia Biologicae , 2010,
Abstract: An experiment was conducted in University of London, Kent, UK during the year 2003. The aim of experiment was to investigate the effects of planting pattern on performance of wheat and bean intercrops. A complete randomized block design with four replications was employed to compare the treatments. Treatments included wheat sole crop (W), Bean sole crop (B), within row intercropping (M1), row intercropping (M2) and mix cropping (M3). The density of intercropping was according to replacement design (one wheat replaced by three bean plants). The results showed that total dry matter achieved by intercrops was significantly higher than those achieved by either wheat or bean sole crop. Regarding to weed control, intercrops were more effective than sole crops, especially bean sole crop. Crops performance in terms dry weight, height and percentage of leaf, stem pod and ear was affected by cropping systems depending on crop species, where wheat showed more changes compared to bean . Grain yield, harvest index and thousand grain weights of wheat were decreased in intercropping while bean had reduction only in grain yield.
Environmental Resource Consumption in Wheat (Triticum aestivum) and Bean (Vicia faba) Intercropping: Comparison of Nutrient Uptake and Light Interception
Hamdollah ESKANDARI,Ahmad GHANBARI
Notulae Scientia Biologicae , 2010,
Abstract: Wheat (Triticum aestivum) and bean (Vicia faba L.) sole crops and their mixture in three planting pattern (M1: alternate-row intercrop, M2: within-row intercrop, M3: mixed intercrop) were used to investigate the amount of resource consumption in terms of PAR interception and nutrient uptake. The experiment was carried out as randomized complete block design with four replications. The results showed that intercropping systems had a significant effect on environmental resources consumption, where intercropping systems had more nutrient uptake and light interception compared to sole crops, suggesting the complementarity effect of intercropping components in resources consumption. The ability of wheat and bean was different in intercropping systems in absorbing nutrients because of their differences in root morphology and cation exchange capacity.
A new mathematical model for single machine batch scheduling problem for minimizing maximum lateness with deteriorating jobs
Hamidreza Haddad,Payam Ghanbari,Ahmad Zeraatkar Moghaddam
International Journal of Industrial Engineering Computations , 2012,
Abstract: This paper presents a mathematical model for the problem of minimizing the maximum lateness on a single machine when the deteriorated jobs are delivered to each customer in various size batches. In reality, this issue may happen within a supply chain in which delivering goods to customers entails cost. Under such situation, keeping completed jobs to deliver in batches may result in reducing delivery costs. In literature review of batch scheduling, minimizing the maximum lateness is known as NP-Hard problem; therefore the present issue aiming at minimizing the costs of delivering, in addition to the aforementioned objective function, remains an NP-Hard problem. In order to solve the proposed model, a Simulation annealing meta-heuristic is used, where the parameters are calibrated by Taguchi approach and the results are compared to the global optimal values generated by Lingo 10 software. Furthermore, in order to check the efficiency of proposed method to solve larger scales of problem, a lower bound is generated. The results are also analyzed based on the effective factors of the problem. Computational study validates the efficiency and the accuracy of the presented model.
Intercropping of Cereals and Legumes for Forage Production
Hamdollah ESKANDARI,Ahmad GHANBARI,Abdollah JAVANMARD
Notulae Scientia Biologicae , 2009,
Abstract: Cereals are high important in feeding ruminant animals for their high dry matter production and low cost. However, cereals forage is poor in protein content which shows their low quality and nutritive value. Regarding to high feed costs of protein supplementations, legumes can be used in livestock nutrition for their high protein content and, thus, providing cost saving. Since legumes have low dry matter yield, acceptable forage yield and quality can obtained from intercropping of cereals and legumes compared with their sole crops. In this paper, forage quality indicators and different factors affecting forage quality are discussed. Forage production and quality of different cereals-legumes intercropping are also reviewed, where; different legumes had different effect on forage quality when intercropped with specific cereal. Regarding to forage quality and quantity, different cereals also led to different production of forage. A number of factors which must be noticified in selecting cereal-legume intercropping compositions, especially for forage production, were considered.
Problematizing Rating Scales in EFL Academic Writing Assessment: Voices from Iranian Context
Batoul Ghanbari,Hossein Barati,Ahmad Moinzadeh
English Language Teaching , 2012, DOI: 10.5539/elt.v5n8p76
Abstract: Along with a more humanitarian movement in language testing, accountability to contextual variables in the design and development of any assessment enterprise is emphasized. However, when it comes to writing assessment, it is found that multiplicity of rating scales developed to fit diverse contexts is mainly headed by well-known native testing agencies. In fact, it seems that EFL/ESL assessment contexts are receptively influenced by the symbolic authority of native assessment circles. Hence, investigating the actualities of rating practice in EFL/ESL contexts would provide a realistic view of the way assessment is conceptualized and practiced. To investigate the issue, present study launched a wide-scale survey in the Iranian EFL writing assessment context. Results of a questionnaire and subsequent interviews with Iranian EFL composition raters revealed that rating scale in its common sense does not exist. In fact, raters relied on their own internalized criteria developed through their long years of practice. Therefore, native speaker legitimacy in the design and development of scales for the EFL context is challenged and the local agency in the design and development of rating scales is emphasized.
Effect of Municipal Wastewater with Manure and Chemical Fertilizer on Grain Yield and Yield Components in Corn KoSc 704
Yaser Esmailiyan,Mostafa Heidari,Ahmad Ghanbari
Journal of Agronomy , 2008,
Abstract: In order to study effects of wastewater with two kind of fertilizers (manure and chemical fertilizer) on grain yield and yield components in corn (KoSc 704) a field experimental was conducted at the university of Zabol in Iran during 2007 growing season. The experiment was conducted as split block design with three replications. The treatments were comprised of two levels of irrigation water (W1 = well water and W2 = wasetewater) in main plot and five levels of fertilizer (F1 = control, F2 = manure: 30 ton ha–1, F3 = manure: 15 ton ha–1, F4 = NPK: 350, 200 and 100 kg ha–1 and F5 = NPK: 175, 100 and 50 kg ha–1) in sub plot. Results showed irrigation with wastewater significantly increased grain yield of corn than usual water. Also, wastewater had positive significantly influence on grain yield and all yield components, but the most effective of wastewater on yield components was on the 1000-seed weight. Among the fertilizer, F4 in all situations had the most effective on the grain yield and yield components and increased them.
Shear tensor and dynamics of relativistic accretion disks around rotating black holes
Mahboobe Moeen Moghaddas,Jamshid Ghanbari,Ahmad Ghodsi
Physics , 2012,
Abstract: In this paper we solve the hydrodynamical equations of optically thin, steady state accretion disks around Kerr black holes. Here, fully general relativistic equations are used. We use a new method to calculate the shear tensor in the LNRF (Locally Non-Rotating Frame), BLF (Boyer-Lindquist Frame) and FRF (Fluid Rest Frame). We show that two components of shear tensor in the FRF are nonzero (in previous works only one nonzero component was assumed). We can use these tensors in usual transonic solutions and usual causal viscosity, but we derive solutions analytically by some simplifications. Then we can calculate the four velocity and density in all frames such as the LNRF, BLF and FRF.
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