Cyberspace and the Identity Matter

Cyberspace and the Identity Matter

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Part of #Cyberspace and the Identity Matter# :

Publishing year : 2016

Conference : Third International Conference on Science and Engineering

Number of pages : 11

Abstract: Cyberspace is a new stage in technological evolution and science production in human life that has evolved along with human civilization and has created a specific cultural and civilizational structure. This space has provided new and pristine areas for human and has affected all aspects of his life and social interactions. Cyberspace actually contains online computer networks in which users exchange with each other at the moment. Internet is the founder of this World Wide Web Development. Internet as a post-modern media has created a new territory in which certainty and integrity has been replaced by fragmentation and diversity. The authors have explained the impact of the cyberspace on identity by descriptive and analytical approaches in this paper. From this perspective, the cyberspace has proposed a new path to the plurality of identity within society and even more within individual identities by creating multiple identification references

SCALING OF LONG-TERM SEISMICITY IN ZAGROS, IRAN

SCALING OF LONG-TERM SEISMICITY IN ZAGROS, IRAN

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Part of #SCALING OF LONG-TERM SEISMICITY IN ZAGROS, IRAN# :

Publishing year : 2011

Conference : 6th International Conference on Seismology and Earthquake Engineering

Number of pages : 8

Abstract: The phenomenon involves an increase in the magnitude and frequency of minor earthquakes in an area near the location of a major event by the long-term precursor scale increase phenomenon. The modeling of long-term seismogenesis as a three-stage faulting process against a background of self-organized criticality can be deduced from a predictor scale increase.

Enhanced Plantlet Regeneration from Cultured Meristems in Sprouting Buds of Saffron Corms

Enhanced Plantlet Regeneration from Cultured Meristems in Sprouting Buds of Saffron Corms

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Part of #Enhanced Plantlet Regeneration from Cultured Meristems in Sprouting Buds of Saffron Corms# :

Publishing year : 2006

Conference : Second International Symposium on Technology and Biology of Saffron

Number of pages : 5

Abstract: When meristems were dissected from dormant corms were used for micropropagation of saffron, low and heterogeneous morphogenic potential as well as high contamination levels were found (Piqueras and Hernandez, 2004). With the aim of preventing the above mentioned inconvenient, shoot cultures have been initiated from meristems in sprouted saffron corms before flowering. These experiments showed a significant lower contamination rate (less than 30%) when cultured in culture medium, composed of QL salts, MS vitamins and 30 g / l sucrose, solidified with 7.5 g / l agar. To study the morphogenic response induced by different cytokinin types and concentrations (BAP, 2iP and TDZ), the explants were cultivated in medium supplemented with them for sex weeks. After this period, the number of new shoots per initial explant, their length and quality were recorded and used as parameters for selecting the most effective cytokinin level for multiplication. Using this new explant for initiation of axillary shoot cultures in a saffron, a new micropropagation procedure has been developed for the selection of selected genotypes for clonal propagation or ex situ germplasm conservation.

A Novel Flux-Based Protection Scheme for Power Transformers

A Novel Flux-Based Protection Scheme for Power Transformers

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Part of #A Novel Flux-Based Protection Scheme for Power Transformers# :

Publishing year : 2014

Conference : The 9th Specialized Conference on Protection and Control of Power Systems

Number of pages : 6

Abstract: Power transformers must be protected against faults and should be monitored permanently to increase power system reliability and reduce maintenance costs. Internal Turn-Turn faults (TTFs) are the most common faults in power transformers, which can seriously reduce the useful life of these equipment. Although common protections such as differential relays can detect some of the internal faults, some other ones (such as TTFs and short circuit near the neutral point) can not be detected by them. Also, these relays may trip erroneously due to energizing inrush currents, transformer over excitation, and occurring CT saturation at one side. In this paper, a novel Linkage Flux Based (LFB) scheme is proposed to detect TTF in power transforms, which uses some Search Coils (SC) located on the transformer legs to sense the associated linkage flux. Any difference in induced voltage in the corresponding SCs (located in any leg) suggests the passing of unsymmetrical linkage fluxes through them (against normal conditions), which stands for occurrence a fault inside the transformer. The proposed technique can not be used to protect power transformers, but can also be used to find fault location during repair operations, as well

Soil Classification Using a Combined Algorithm of Simulated Annealing and Genetic Programming

Soil Classification Using a Combined Algorithm of Simulated Annealing and Genetic Programming

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Part of #Soil Classification Using a Combined Algorithm of Simulated Annealing and Genetic Programming# :

Publishing year : 2009

Conference : Eighth International Congress of Civil Engineering

Number of pages : 8

Abstract: This paper presents a novel approach for determination of soil classification using a hybrid search algorithm that couples genetic programming (GP) and simulated annealing (SA) as a combined algorithm called GP / SA. Properties of soil, namely, plastic limit, liquid limit, color of soil, percentage of gravel, sand, and fine grained particles were used as input variables to the models to determine the soil classification. The odels were developed using a reliable database derived from previously published literature. The results of GP / SA based formulations were found to be more accurate as compared to experimental, numerical and analytical results obtained by other researchers.

Bottleneck Analysis In a Pharmaceutical Production Line, Using Simulation Approach

Bottleneck Analysis In a Pharmaceutical Production Line, Using Simulation Approach

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Part of #Bottleneck Analysis In a Pharmaceutical Production Line, Using Simulation Approach# :

Publishing year : 2012

Conference : 9th International Industrial Engineering Conference

Number of pages : 7

Abstract: The main purpose of this paper is to introduce an effective framework for detecting bottlenecks in a high-speed production line of the Exir Pharmaceutical Company in Tehran, Iran, in order to find out the improvement scenarios for reducing the bottleneck effect and increasing the output of the Production line. The proposed framework integrates the simulation model of the line and bottleneck detection methods. Bottleneck detection methods detect bottleneck machine-based simulation modeloutputs and then improving scenarios are foundout. Scenarios are evaluated with simulation model based on the desired performance measures such as average daily production. The results analysis shows that the average daily production can be increased by 20%.

Experimental and Theoretical Investigation of Simultaneous Absorption of H2S and CO2 from gaseous mixtures by MEA

Experimental and Theoretical Investigation of Simultaneous Absorption of H2S and CO2 from gaseous mixtures by MEA

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Part of #Experimental and Theoretical Investigation of Simultaneous Absorption of H2S and CO2 from gaseous mixtures by MEA# :

Publishing year : 2004

Conference : Ninth National Congress of Chemical Engineering of Iran

Number of pages : 13

Abstract: Absorption of H2S from a gaseous mixture containing H2S and CO2 by amine solutions is one of the promising techniques for preventing serious environmental problems that could be caused by this harmful compound. Usually these gases contain some significant amounts of CO2 that compete with H2S in being absorbed by amine solutions. So the problem of selective absorption of H2S by the amine solution could be very interesting from the economic and operational points of view. In this research, a mathematical model is proposed for simultaneous absorption of H2S and CO2 with special emphasis on selectivity of absorption. The effects of different parameters such as pressure, amine concentration, L / G and packing size are studied on the selectivity of absorption. The effect of these parameters is discussed according to the different nature of
mechanism of H2S and CO2 absorption in amine, theoretically and experimentally. A pilot scaled plant is constructed to measure the rate of absorption of H2S and CO2 in an amine solution at different operating conditions. The results obtained by the proposed mathematical model are compared with experimental data. Once the validity of the model is verified, it could be used for design and construction of industrial plants.

Investigation of parameters affecting discrete Vapour cavity model

Investigation of parameters affecting discrete Vapour cavity model

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Part of #Investigation of parameters affecting discrete Vapour cavity model# :

Publishing year : 2014

Conference : National Conference on Civil Engineering, Urban Development and Sustainable Development

Number of pages : 10

Abstract: Rapid valve closure or pump shutdown causes a rapid transitional flow with column separation which causes such problems as hydraulic equipment damage and cavitation. This paper presents a numerical study of a water hammer with column separation in a simple reservoir-pipeline-valve system. The governing equations for two-phase transient flow in the pipes have been solved based on a method of characteristics using a discrete vapor cavity model (DVCM), which has been coupled with four different friction models including Brunone, Zielke, Vardy and Brown, and quasi -steady friction. The DVCM may produce unrealistic pressure pulses (spikes) due to the collapse of multi-cavities. Studies of the DVCM have suggested that using a weighting factor close to 1.0, using the unsteady friction term in the DVCM and restricting the number of reaches to improve computational results, and this paper explores this suggestion in detail. The simulation results clearly show that using the unsteady friction term in the DVCM reduces the unrealistic pressure pulses. It has been observed that using a weighting factor close to 1.0 and restricting the number of reaches does not improve the computational results in all cases. Instead, the proper selection of these parameters reduces the unrealistic pressure pulses.

Optimal Solving of Scheduling Problem with V2G Based on Mixed Integer Quadratically Constrained Programming

Optimal Solving of Scheduling Problem with V2G Based on Mixed Integer Quadratically Constrained Programming

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Part of #Optimal Solving of Scheduling Problem with V2G Based on Mixed Integer Quadratically Constrained Programming# :

Publishing year : 2012

Conference : Fourth Iranian Conference on Electrical and Electronic Engineering

Number of pages : 5

Abstract: Vehicle to Grid (V2G) processes has been drafted in recent years. Electric Vehicles (EV) with the ability to connect to the grid are a kind of storage systems with a set of special features. Unit commitment (UC) includes efficiently scheduling on / off states of all available generators in power network. As the number of gridable vehicles in V2G is much higher than the minor units of existing systems, UC with V2G is more complex than basic traditional UC. This paper presents a Compound Integer Quadratically Constrained Programming (MIQCP) Component Commitment to a Vehicle to Grid (UC-V2G). As a case study, the results of the 10-bus system are presented to facilitate the efficiency of the proposed method

Estimation of Creep Deformations in Circular Tunnels Considering Elasto-Plastic Behavior

Estimation of Creep Deformations in Circular Tunnels Considering Elasto-Plastic Behavior

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Part of #Estimation of Creep Deformations in Circular Tunnels Considering Elasto-Plastic Behavior# :

Publishing year : 2012

Conference : 7th International Conference on Science and Technology

Number of pages : 7

Abstract: By excavating an underground space, the state of stress and displacement in the environment are changed in comparison with initial state. As time passes, the variation of displacement mainly depends on the creep behavior of the hosting rock mass. In this paper, an elasto-viscoplastic creep model is proposed. In the proposed model, the main purpose is to consider plastic deformations increasing with time. The viscoplastic behavior of rocks plays a key role in tunneling works, especially for deep tunnels subjected to large in situ stresses. Using the nonlinear Hoek-Brown yield criterion in a creep model is another important objective of this paper, which eliminates the estimation of specific specific Mohr-Coulomb strength parameters from the Hoek-Brown parameters. The equations are related to the proposed model, and then, to achieve a numerical solution of the equations, the finite difference software (FLAC (2D) -FISH Editor) is used. The application of the proposed model is illustrated numerically using a finite difference software FLAC (2D).