EVALUATION OF SEISMIC PERFORMANCE OF AN EXISTINGDOLPHIN-TYPE BERTH SUBJECTED TO LIQUEFACTIONINDUCEDLATERAL SPREADING BY LARGE SCALE SHAKETABLE TEST

EVALUATION OF SEISMIC PERFORMANCE OF AN EXISTINGDOLPHIN-TYPE BERTH SUBJECTED TO LIQUEFACTIONINDUCEDLATERAL SPREADING BY LARGE SCALE SHAKETABLE TEST

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Part of #EVALUATION OF SEISMIC PERFORMANCE OF AN EXISTINGDOLPHIN-TYPE BERTH SUBJECTED TO LIQUEFACTIONINDUCEDLATERAL SPREADING BY LARGE SCALE SHAKETABLE TEST# :

Publishing year : 2014

Conference : Eleventh International Conference on Coastal, Ports and Marine Structures

Number of pages : 5

Abstract: Several important ports and marine structures are located in the northern and southern coasts of Iran, which are mostly comprised of saturated sands that are potentially prone to liquefaction during earthquakes.

Distortional Buckling of I – Shaped Columns

Distortional Buckling of I - Shaped Columns

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Part of #Distortional Buckling of I – Shaped Columns# :

Publishing year : 2012

Conference : Fourth International Conference on Reinforcement

Number of pages : 9

Abstract: Steel columns can be classified according to the ratio of slimming to three general categories. Long columns of medium pillars and short pillar columns have elastic behavior and collapse with elastic bending buckling. Short pillars are not only not buckling due to very low weight. But they can tolerate the surrender of all the cross sections and even the re-hardening area. Moderate pillars are in contrast to the short and long columns of complex behavior. In this type of columns, under certain conditions, some of the cross sections are submerged, while others are still in the elastic zone. gay The rupture and instability in this type of columns are due to the elastic buckling of some sectional sections along with the flow of other wires from the ground. For this reason, the buckling in these columns is non-elastic buckling, and in general terms these columns are non-reciprocal columns. Moderate vertices due to the state It has been pointed out that most of the distortional buckling bursts occur. These types of moderate-moderate columns are unstable in the case of distortion buckling.

Coded Cooperation Diversity for Uncoded Oversampled OFDM Systems

Coded Cooperation Diversity for Uncoded Oversampled OFDM Systems

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Part of #Coded Cooperation Diversity for Uncoded Oversampled OFDM Systems# :

Publishing year : 2008

Conference : Sixteenth Iranian Conference on Electrical Engineering

Number of pages : 6

Abstract: Recently, user-collaboration diversity has been introduced as an effective scheme that can bring about antenna diversity in wireless networks. In this paper, we introduce a co-distributed multi-technology technique for single-antenna uncoded OFDM systems, in which the implementation of collaboration is provided by the oversampling potential in OFDM instead of using extra channel coding. In fact, the zeropadding followed by IFFT in OFDM is similar to oversampling and could be an alternative to correction codes. Furthermore, we use this oversampling to implement the iterative receiver at the partner terminal. This receiver works base on the nonuniform sampling theorem for reconstructing lost symbols. The lost symbols appear at the partner terminal due to the division of each OFDM block into the two segments through the puncturing at the user terminal. We provide simulation results for our proposed scenario; and observe significant gains over non-cooperative oversampled OFDM systems without any need for any use for extra channel coding.

Effect of COD/N ratio on growth and adaptation of nitrifying bacteria

Effect of COD/N ratio on growth and adaptation of nitrifying bacteria

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Part of #Effect of COD/N ratio on growth and adaptation of nitrifying bacteria# :

Publishing year : 2013

Conference : Third Conference on Environmental Planning and Management

Number of pages : 9

Abstract: Acclimation of nitrifying bacteria using inorganic carbon source (bicarbonate) and organic carbon source (bicarbonate + glucose) was performed in this study. Sequential batch reactors were inoculated with activated sludge (mixed culture of heterotrophic and nitrifying bacteria), and fed by synthetic wastewater containing high concentration of ammonia (1000 mg L-1). Adapted nitrifying bacteria, using only bicarbonate as an carbon source, is caused by nitrification at a rate of 41 mg L-1 h-1. The second reactor, which uses the bicarbonate and glucose as an carbon source due to high C / N ratio, resulted in high growth of heterotrophic bacteria and the result showed a minor effect on nitrifying bacteria and ammonium complete removal

The situation of Rural Tourism Economy in Iran, with a Focus on Inhibiting Factors Affecting Positive Impacts of Rural Tourism on Iran’s Economic Status

The situation of Rural Tourism Economy in Iran, with a Focus on Inhibiting Factors Affecting Positive Impacts of Rural Tourism on Iran’s Economic Status

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Part of #The situation of Rural Tourism Economy in Iran, with a Focus on Inhibiting Factors Affecting Positive Impacts of Rural Tourism on Iran’s Economic Status# :

Publishing year : 2015

Conference : 6th International Conference on Economics, Management and Engineering Sciences

Number of pages : 7

Abstract: In this research, we tried to study the situation of tourism & amp; Rural tourism economy in Iran, the condition of entry and exit of tourists in Iran andinhibiting factors affecting the positive impacts of tourism & amp; Rural tourism is Iran's economic status. For studying the situation of tourism & amp; Rural tourism economy in Iran we used from documentary and library research methods. Also for finding the inhibiting factors affecting the positive impacts of tourism & amp; rural tourism on Iran's economic status, we used it from field research method based on questionnaire. The statistical methods of this research are based on119 authorities involved in tourism and rural tourism. For perusing the descriptive and demographic results, descriptive statistical tests were used for the sample comparison of the Kolmogorov Smirnove test. The most important results of this study are as follows: Iran's contribution to the contribution of tourism to GDP in the years 2003-2014 is very low and its changes in these years are disproportionate. There is no especial information and detailed statistics on rural tourism and rural tourists in Iran. Lack of planning, participation and management in the field of tourism are the most important inhibiting factors affecting positive tourism impacts on Iran's economic status from authorities' point of view. Also politicalfactors could be one of the most important factors affecting the tourism economic situation in Iran.

Mixed Convection and Thermal Radiation Heat Transfer in a Three Dimensional Vertical Channel

Mixed Convection and Thermal Radiation Heat Transfer in a Three Dimensional Vertical Channel

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Part of #Mixed Convection and Thermal Radiation Heat Transfer in a Three Dimensional Vertical Channel# :

Publishing year : 2011

Conference : 19th Annual Conference of Mechanical Engineering

Number of pages : 4

Abstract: A numerical study of the mixed convection (free and forced) together with thermal radiation is carried out in a vertical square channel, taking into account all of the radiation (emitting, scattering and absorbing). The flow in the channel is assumed to be laminar, steady and three dimensional. The opposite walls temperatures are considered to be different but constant. The governing equations include continuity, momentum, energy and radiative transfer equation and by solving them altogether, determine the velocity, pressure and temperature fields. The SIMPLE algorithm with a staggered system is used to solve the corresponding numerical equations formulated by the finite volume method and the discrete ordinate method, the DOM, its 6S scheme, is adopted for the radiation part. A fifth-order power law scheme is used to model the convection term and an appropriate grid distribution is introduced. The main objective of this work is to evaluate the effects of radiation parameters such as the conduction-radiation parameter and the optical thickness on the heat transfer in the 3-D channel. The results are presented as the profiles of velocity and temperature across the width of the channel, showing that these radiation parameters are influential on the flow.

Making comparison between security providers in Cloud Computing and present innovative secure scheme based on Hybrid Kalman Filtering

Making comparison between security providers in Cloud Computing and present innovative secure scheme based on Hybrid Kalman Filtering

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Part of #Making comparison between security providers in Cloud Computing and present innovative secure scheme based on Hybrid Kalman Filtering# :

Publishing year : 2014

Conference : First National Conference on Technological Advances in Electrical, Electronic and Computer Engineering

Number of pages : 6

Abstract: This paper is about a new technology that is named Cloud Computing. This revolutionary technology, share storage and processing ability to all the computer users through the internet. In this paper, at the first section, authors review the fundamentals of this technology. They discuss the benefits and potentials of this technology and also briefly describe some of its prominent applications. After that in the second section of this paper, we analyze the secure SDK and execution environment. In this section, the authors explain the protection of software modules, secure software distribution, controlled execution environment and the study of secure execution environment. After obtaining a general understanding of security in large-scale networks, in the third section of this paper, the authors apply a new Kalman filter, which is called the Hybrid Kalman filter. The purpose of purposing this filter is to increase the security level of such networks; Because if we have an estimator and predictor in such a network we can estimate and predict about the amount of resources and powers that we need in the network to prepare acceptable services for users.

Numerical simulation of air-cooled condenser performance under different windy condition

Numerical simulation of air-cooled condenser performance under different windy condition

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Part of #Numerical simulation of air-cooled condenser performance under different windy condition# :

Publishing year : 2010

Conference : Eighteenth Annual Conference of Mechanical Engineering

Number of pages : 6

Abstract: A reliable and economical power production in thermal power plants is highly dependent on the optimal selection of site equipment and their best possible arrangement. One of the most significant systems that play a crucial role in power production is the cooling system. Therefore, understanding and predicting the factors or mechanisms that can reduce the performance of ACC is essential. The hot air recirculation (HAR) is a common problem in air-cooled power units. HAR is affected by the arrangement of the air-cooled island, the environmental condition around the direct air-cooled system, the wind direction and wind speed. Results show that the wind causes air temperature rise at the fan inlet due to hot air recirculation, resulting in a deterioration of the heat transfer efficiency. At the wind speed of 3 m / s, the plume rise angle (angle between flume and vertical) is approximately 30 , 45 at 6 m / s and 55 at 9 m / s. The hot air recirculation increases with increment of velocity speed. The hot air recirculation is the main factor responsible for the reduction of heat rejection rate. The peak value of the HAR occurs at 9 m / s and the wind direction angle = 90 .

Multi- Storey Buildings Behavior under Seismic Ground Motion using MAPA Method

Multi- Storey Buildings Behavior under Seismic Ground Motion using MAPA Method

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Part of #Multi- Storey Buildings Behavior under Seismic Ground Motion using MAPA Method# :

Publishing year : 2009

Conference : Eighth International Congress of Civil Engineering

Number of pages : 8

Abstract: The innovative Modal Adaptive Pushover Analysis (MAPA) procedure for asymmetric building systems under seismic ground motions is proposed. In this study, MAPAs are extended to two-way asymmetric buildings simultaneously excited by two horizontal components of ground motion using an adapted DRAIN-3DX computer program. An asymmetric multi-story building is analyzed by the MAPA procedure. The analytical results are compared with those obtained from nonlinear response history analysis (RHA). When the RHA results are taken as reference, it is seen that the proposed method is capable of estimating frame buildings' seismic response.

Effects of Temperature and Organic Loading Rates on the Biogas Yield of MSW Anaerobic Digester

Effects of Temperature and Organic Loading Rates on the Biogas Yield of MSW Anaerobic Digester

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Part of #Effects of Temperature and Organic Loading Rates on the Biogas Yield of MSW Anaerobic Digester# :

Publishing year : 2011

Conference : 7th National Congress of Chemical Engineering

Number of pages : 7

Abstract: The amount of municipal solid waste (MSW) generated in Iran is about 60000 tons / day of which more than 70% is organic waste. The objective of this study was to optimize the applications of anaerobic digestion for the treatment of municipal organic waste. In order to obtain a basic design criterion for anaerobic digesters of MSW, the effect of different organic loading rates (OLR) and digesting temperatures were investigated. The study was made at pilot scale using a 70l reactor. In the first part of the study, the digester was operated at different organic feeding rates of 1.4.2 and 2.75 kg VS / (m3.d). The biogas produced had a methane composition of 49.7-64% and biogas production rates of 0.12-0.4 m3 / (kg VS). The reactor showed a stable performance with a high biogas production (0.4m3 / kg VS) and a VS reduction of about 88% at a loading rate of 1.4 kg VS / (m3.d). VS removal and methane concentration in the biogas was reduced when the organic loading rate was increased. In the second part of the study, the digester temperature was set between 25-34 C. Digestion with temperature in these range resulted in a biogas yield of 0.23-0.33 m3 biogas / kg VS, with a methane content in the biogas of 52.4-62.6%. The methane content and yield decreased with a reduction of digestion temperature. However, this reduction was almost negligible from 34 C to 30 C. Based on the data obtained from this study, organic loading rates of 1.4 kg VS / (m3.d) and temperature in the range of 30-34 C are suggested as a basis for design purpose.