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Search Results: 1 - 10 of 12886 matches for " Mohammad Valipour "
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Sprinkle and Trickle Irrigation System Design Using Tapered Pipes for Pressure Loss Adjusting
Mohammad Valipour
Journal of Agricultural Science , 2012, DOI: 10.5539/jas.v4n12p125
Abstract: Accurate computing of amount of pressure loss is very important in sprinkle and trickle irrigation system design. Not correctly adjusted of pressure loss are causes lack of appropriate performance or failure of sprinkle and trickle irrigation system. By tapered pipes, pressure loss adjusted using increasing or decreasing of pressure head. In this study using HydroCalc software, ability of single and tapered pipes in pressure loss adjusting has been compared. Single and tapered laterals were able to adjusting of pressure loss but single manifolds were not able to achieving to the desired pressure head. In single lateral-tapered manifold system due to the lower pressure loss in laterals, can be use from several types of pipe diameters for manifolds but in tapered lateral-tapered manifold system due to the more pressure loss in laterals, the choice is limited. The best diameters for tapered manifolds with single lateral were 69.2-36.8 mm, 69.2-58.2-36.8 mm, and 58.2-46.0-36.8 mm whereas the best diameters for tapered manifold with tapered lateral were 69.2-46.0-36.8 mm.
Comparison of Surface Irrigation Simulation Models: Full Hydrodynamic, Zero Inertia, Kinematic Wave
Mohammad Valipour
Journal of Agricultural Science , 2012, DOI: 10.5539/jas.v4n12p68
Abstract: Some phenomena such as surface irrigation are so complex that it is very difficult to implement them in nature. For this purpose, simulation models are used. In this study, ability of full hydrodynamic, zero inertia, and kinematic wave models has been investigated in surface irrigation simulation. Using SIRMOD software, their performance has been compared. The results showed that full hydrodynamic and zero inertia models were very powerful in simulation process. For increasing of filed slope until amount of 0.01 full hydrodynamic and zero inertia models had not any difference but for more increasing of S0 due to the increasing of velocity, accuracy of zero inertia model dropped. In full hydrodynamic and zero inertia models for increase in Manning’s roughness coefficient amount of error was increased until n=0.15. After this amount, error remained constant thus n=0.15 determined as critical discharge. Accuracy of kinematic wave model reduced in clay and heavy clay soils, high discharges, high Manning’s roughness coefficient, and basin irrigation. However, in many situations all three models had the same answers and were capable tools to simulating of surface irrigation processes.
Earning Quality and Stock Return of Listed Companies in Tehran Stock Exchange (TSE)
Mohammad Hadi Zohdi,Hashem Valipour,Mohadese Hasani,Mohammad Reza Dalvand
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: Earning quality is referred to the closeness of operating earnings to cash flow of operation. The more the distance of earning with cash flow, the less the earning quality and the less the ability of earning to explain stock return changes. Therefore, the present study aims to investigate the relation between earning quality and gained return by stockholders. To do the research, 157 companies of the companies listed in TSE were selected and the related data were studied during 2006 to 2010 by statistical tests of Analysis of Variance (ANOVA) and correlation. The results indicated that among different classified companies, there is not different return average based on earning quality. The other results show that there was no significant relation between earning quality and stock return of the companies.
The Survey of the political Costs and Firm Size: Case from Iran
Reza Tehrani,Mahdi Salehi,Hashem Valipour,Mohammad Jahandar Lashky
Business Intelligence Journal , 2009,
Abstract: The political cost is one of the most important costs and payment of companies, and companies sought to reduce these costs. According to the theory that political expenditures by Watts and Zimmerman has been presented, Politicians have the power to by using the policies of the distribution of wealth again such as taxes, aid, the contributions, insurance and etc companies under the influence of. In other words, the change in currents can cash by taxes, special rules and information pertinent to the political challenges under the influence of. The aim of this research study is the relationship between the size of the company and the political costs. To do research the historical information of all present companies in Tehran stock exchange in the period of time 2005 to 2007 has been used. In the way of analyze information after making dependent conversional normal, seeing transmittal charts and with regard to the index R2, logarithmic models have been selected for the expression of communication. The results of different patterns show that relation between the size of company and political costs is meaningful. It means that by increasing the costs of the company as much as political as well as it will increase. On the other hand because companies' environment in political activities and many of the cost of the political support by law, so a big part of the political challenges that the companies will be imposed is unavoidable and another part of it like celebration relations and the cost for participation in elections and help and contributions have been impossible to control and it can be with proper management and precise auditing by considering the long-term works reduced them.
A simple method for decision making in robocup soccer simulation 3d environment
Khashayar Niki Maleki,Mohammad Hadi Valipour,Sadegh Mokari,Roohollah Yeylaghi Ashrafi,Mohammad Reza Jamali,Caro Lucas
Computer Science , 2012,
Abstract: In this paper new hierarchical hybrid fuzzy-crisp methods for decision making and action selection of an agent in soccer simulation 3D environment are presented. First, the skills of an agent are introduced, implemented and classified in two layers, the basicskills and the highlevel skills. In the second layer, a twophase mechanism for decision making is introduced. In phase one, some useful methods are implemented which check the agent's situation for performing required skills. In the next phase, the team str ategy, team for mation, agent's role and the agent's positioning system are introduced. A fuzzy logical approach is employed to recognize the team strategy and further more to tell the player the best position to move. At last, we comprised our implemented algor ithm in the Robocup Soccer Simulation 3D environment and results showed th eefficiency of the introduced methodology.
The Geotourism Potential Investigations in Kashmar Area, Khorasan-e-Razavi Province, NE Iran
Morteza Taherpour Khalil Abad,Mohammad Ibrahim Fazel Valipour,Habib Allah Torshizian,Vida Taherpour Khalil Abad
Iranian Journal of Earth Sciences , 2012,
Abstract: The remains of the natural and human activities in some parts of the earth register as geopark. Actually, geopark is one or more geological phenomenon which is important from ecology, history, culture and archeological view. The aim of the geotourism description in an area and creating a geopark is trying to keep the earth's inheritance and locality the economic of the area. Iran with an old history, diversity of the environment and a lot of geological phenomenon has a great potential in creating geoparks. From this point of view, we can divide it into the five geotourism areas which are as follows: North, South, East, West and Central part of Iran. The Kashmar township is an area which is located in the south part of the Khorasan-e-Razavi province in the Northeast of Iran. This area because of the nearness into the desert, is hot and dry. The area is rich of mines, hot-water springs and geological landscapes. In this research, we tried to introduce some examples of the geotourism features in the study area such as faults, mines, hot-water springs, Bejestan playa, Asyab-e-Khooshab valley, Kavir-e-Lut salt desert, Bijvard entrance, Sar-e-Borj waterfall, Sir and Ahoo Bam caves and Natural glacier.
Channel Optimized Distributed Multiple Description Coding
Mehrdad Valipour,Farshad Lahouti
Mathematics , 2011, DOI: 10.1109/TSP.2011.2180903
Abstract: In this paper, channel optimized distributed multiple description vector quantization (CDMD) schemes are presented for distributed source coding in symmetric and asymmetric settings. The CDMD encoder is designed using a deterministic annealing approach over noisy channels with packet loss. A minimum mean squared error asymmetric CDMD decoder is proposed for effective reconstruction of a source, utilizing the side information (SI) and its corresponding received descriptions. The proposed iterative symmetric CDMD decoder jointly reconstructs the symbols of multiple correlated sources. Two types of symmetric CDMD decoders, namely the estimated-SI and the soft-SI decoders, are presented which respectively exploit the reconstructed symbols and a posteriori probabilities of other sources as SI in iterations. In a multiple source CDMD setting, for reconstruction of a source, three methods are proposed to select another source as its SI during the decoding. The methods operate based on minimum physical distance (in a wireless sensor network setting), maximum mutual information and minimum end-to-end distortion. The performance of the proposed systems and algorithms are evaluated and compared in detail.
Dividend Policy and Information Asymmetry from the Signaling Perspective
Reza Zare,Javad Moradi,Hashem Valipour
Asian Economic and Financial Review , 2013,
Abstract: This study attempts to examine the relevance of dividend policy and information asymmetry From the Signaling Perspective and Compare the relative information content of them. Based on sampling, 88 firms from Tehran Stock Exchange (TSE) were selected and examined during 2003 to 2010. The findings show that the profit division policy(Divisible profit proportion) has positive and significant relation with market data asymmetry namely when the profit division policy increases the data asymmetry increases, too. On the other side, the test findings indicate the investors are sensitive to the EPS changes and when the EPS changes are positive their divisible profit increases, but when the divisible profit of the company decreases the data boggles their mind and data asymmetry increases.
Asymmetric Information and Dividend Policy in Emerging Markets: Empirical Evidences from Iran
Hashem Valipour,Vahab Rostami,Mahdi Salehi
International Journal of Economics and Finance , 2009, DOI: 10.5539/ijef.v1n1p203
Abstract: Purpose-this study investigates the effect of asymmetric information on dividend policy in listed companies in Tehran Stock Exchange. Methodology-four main hypothesis have designed by theoretical framework, and tested on 111 listed companies in Tehran stock exchange during 2003 to 2007. The statistic analysis had done by malt- variable regression analysis. Findings-the study findings show that there is a meaningful and reverse relationship between asymmetric information and dividend policy. Some other findings show there is a meaningful relationship between dividend policy and return on stock but there is no meaningful relationship between dividend policy with firm size and book value to market value of equity ratio. Practical implementation-the finding of the study could be helpful for university students and users of financial information and other financial analysts in capital market.
Effects of Indole-3-butyric Acid on the Rooting Ability of Semi-hardwood Bougainvillea sp. Cuttings
Marzieh Babashpour Asl,Somayeh Shakueefar,Vida Valipour
Modern Applied Science , 2012, DOI: 10.5539/mas.v6n5p121
Abstract: The experiment was carried out to investigate the effect of different concentration of Indole-3-butyric acid (IBA) on the rooting ability of semi-hardwood Bougainvillea flower. The treatments were control (without IBA), 2000, 3000 and 4000 ppm IBA. The cuttings were treated with IBA solution for 7 seconds and immediately transferred to the rooting medium. Perlite was used as a rooting substrate. Treatment was evaluated in a completely randomized design (CRD) with 3 replications. According to the obtained results, there was no significant difference between IBA treatment and control on rooting percentage. The best effect of different levels of IBA on the number of root (8.67 roots per plant) was obtained at 2000 ppm IBA. The highest root length (151.42 mm) was observed at control and there was no significant difference between control and 2000, 4000 ppm IBA. It can be concluded that using perlite as a rooting substrate without using IBA (control) affected rooting ability in bougainvillea flower.
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