Synthesis of a Novel Interpenetrating Polymer Network Hydrogel as Drug Delivery System

Synthesis of a Novel Interpenetrating Polymer Network Hydrogel as Drug Delivery System

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Part of #Synthesis of a Novel Interpenetrating Polymer Network Hydrogel as Drug Delivery System# :

Publishing year : 2011

Conference : 7th National Congress of Chemical Engineering

Number of pages : 6

Abstract: The present study aims to develop a novel type of interpenetrating polymeric network (IPN) hydrogels of chitosan with poly (acrylic acid) for controlled release of amphetamine drug. IPN hydrogels were synthesized by simultaneous polymerization / crosslinking of acrylic acid monomer in the presence of chitosan and crosslinker. The swelling properties and in vitro drug release characteristics of IPN hydrogels have been investigated in detail. The variation in the composition of the IPN was achieved by varying the crosslinker concentration. In addition, these IPNs have been characterized for their pH-sensitive behavior by equilibrium swelling studies. It was observed that the release of amphothein was much higher at pH 7.4 compared to pH 1.2, indicating that the release system is controllable and can be as a release system for specific drug delivery of the intestine.

An Intelligent Approach to Estimate Pressure-Volume-Temperature Properties in the System of Methane- Tetrafluoromethane: Densities and Compressibility Factors

An Intelligent Approach to Estimate Pressure-Volume-Temperature Properties in the System of Methane- Tetrafluoromethane: Densities and Compressibility Factors

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Part of #An Intelligent Approach to Estimate Pressure-Volume-Temperature Properties in the System of Methane- Tetrafluoromethane: Densities and Compressibility Factors# :

Publishing year : 2009

Conference : Sixth International Congress of Chemical Engineering

Number of pages : 6

Abstract: In this study, the ability of the Artificial Neural Network or ANN based on a back-propagation approach for predicting the densities and compressibility of gaseous binary mixtures of CH4-CF4 has been investigated. Some optimal networks are used for finding the optimal network, for which the density range is from 0.75 to 12.5 mole / lit were covered. Finally, the 10-5-1 neuron in the network layer is selected. By using this number of neurons, admissible absolute average deviations (approximately 0.112593% and 0.121046% for training and testing steps, respectively) are provided. Then, a comparison of the compressibility factors for a mixture containing 50% CH4 shows an acceptable deviation of about 0.023604%. These results show that there is a good agreement between experimental data and ANN predictions.

Data Hiding in video H.264 by motion vectors

Data Hiding in video H.264 by motion vectors

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Part of #Data Hiding in video H.264 by motion vectors# :

Publishing year : 2015

Conference : Second International Conference on Science and Technology

Number of pages : 15

Abstract: Currently, data transmission over the internet is safe from all directions and is vulnerable to various attacks. So in order to prevent access to valuable information, we need to have special security measures. A method for secure transmission of data, the steganography method, which we attribute to hide his message in this way, we can create more secure. Data steganography is one of the ways that a message can be in the picture, audio, video, text, etc. Hidden In this project we will use the H.264 video stream watermarking algorithm. Unlike the previous watermarking methods, the spatial domain, or the data used to hide the data, we compress the video to hide the secret data we use, so that the motion vectors for encoding and rebuilding both predicted P frames and B frameworks in video compression Used. Where the motion vector using macroblock prediction error is calculated, then the method based on motion vector features such as measure and angle can be used. Finally, all the candidates for the embedded data, and then using the LSB bits of the secret message is replaced. And at the same time for each GOP, the control information for the data embedded in the frame is done. At the end of the control information in each frame, we extract the secret message. The proposed method is well done. The algorithm is tested on different types of films based on the above criteria, the proposed method is well done.

Consideration of Gas Flow in Exhaust System

Consideration of Gas Flow in Exhaust System

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Part of #Consideration of Gas Flow in Exhaust System# :

Publishing year : 2003

Conference : Eighth National Congress of Chemical Engineering of Iran

Number of pages : 12

Abstract: The knowledge of the velocity fluctuations associated with acoustic pressure oscillations in the exhaust system of internal combustion engines can represent a powerful aid in the design of such a system, from the point of view of both engine performance improvement and exhaust noise reduction. We report a numerical study on hot gas exhaust flow. The behavior of the hot gas has been studied based on measured gas temperature and numerical simulation. The first part of the document presents a methodology based on the numerical finite-element solution of the governing differential conservation equation of mass, momentum, energy, and turbulent modeling (k-e) which yield variations of
The velocity, pressure, temperature of the gas flow in the exhaust. The remainder of the document compare these results with experimental results that we got in the lab. The results reported in this article provide guidance for the optimal structure of the exhaust chamber.

Introducing a New Methodology to Maximize the Success Reliability of Engineering, Procurement and Construction (EPC) Contracts

Introducing a New Methodology to Maximize the Success Reliability of Engineering, Procurement and Construction (EPC) Contracts

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Part of #Introducing a New Methodology to Maximize the Success Reliability of Engineering, Procurement and Construction (EPC) Contracts# :

Publishing year : 2016

Conference : 7th International Conference on Economics and Management

Number of pages : 12

Abstract: Application of reliability concept has no suitable situation in civil engineering projects. This concept is used in manydifferent industrial projects and has led to an increase in theirreliability. One of the most important points in applying the credibility concept in civil engineering projects is systematicapproach to EPC contracts. This paper will show a methodology for calculating and enhancing the reliability of EPC contracts on the basis of system specifications. In this method, the probability of unsafe operations of system components is taken into account (instead of the probability of safe operations); Which is another point that has not been seen in similar studieses. Equalizing of risk effects is one of the new ways that is applied in this method.671 The risks have been derived from the study of the EPC contract terms; And these risks have been evaluated and the relationship between them and EPC contracts is derived. To make similarrisks effects, decision-making parameters have been introduced that produce similar risk effects. As an important parameter, reliability is more enhanced on the basis of taking financialproblems of projects into account. In a case study, it will be added that the reliability of a project is increased from% 6.81 to% 1. by using this methodology.

Real-parameter Compact Supervision for the Particle Swarm Optimization (RCSPSO)

Real-parameter Compact Supervision for the Particle Swarm Optimization (RCSPSO)

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Part of #Real-parameter Compact Supervision for the Particle Swarm Optimization (RCSPSO)# :

Publishing year : 2013

Conference : Twelfth National Conference on Intelligent Systems

Number of pages : 6

Abstract: This paper proposes the Real-parameter Compact Supervision for the Particle Swarm Optimization (RCSPSO) in order to optimize problems with continuous parameters. RCSPSO uses the evolutionary configuration of the Real-Value Compact Genetic Algorithm (RCGA) and the Particle Swarm Optimization (PSO) search philosophy. As a Compact Evolutionary Algorithms (CEA), RCGA rather than a population of individuals processes a statistical representation of that population. Thus, it shows a very explorative behavior. In contrast, PSO, despite having access to multiple solutions, only uses the best solution to explore the search space. Although it hardly consumes any additional memory, it provides great insight on the potential exploration areas to the particles. In addition, to improve the update operation of the probability vector in RCGA, it uses an algorithm that prevents inaccurate influence of particle fitness on its genetic fitness by evaluating each gene separately. The algorithm uses a combination of Cauchy and Gaussian distributions. To show the algorithm's viability, we useDifferential Evolution (DE), CEAs and PSO have some well-known benchmark functions under identical initial conditions. The results show that the proposed method outperforms the aforementioned algorithms in most simulation scenarios

Effect of Aquifer Size On the Performance of Partial Waterdrive Gas Reservoirs

Effect of Aquifer Size On the Performance of Partial Waterdrive Gas Reservoirs

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Part of #Effect of Aquifer Size On the Performance of Partial Waterdrive Gas Reservoirs# :

Publishing year : 2011

Conference : Third National Congress of Petroleum Engineering

Number of pages : 16

Abstract: The prediction of gas / water contact (GWC) in a waterdrive gas reservoir plays an important role in reservoir performance evaluation, forecasting and analysis. This study was conducted to predict the behavior and the rise of the GWC, assuming that it remains horizontal, and to determine its effect on ultimate gasrecovery. Several factors control the rise of the GWC. Some of the most important factors are the size of the aquifer, the gas production rate, initialreservoir pressure, and formation permeability. These factors account for the abandonment of a number of gas reservoirs at extraordinarily high pressure. Several methods have been developed for predicting the volume of water flow into a reservoir; The van Everdingen-Hurst method is used in this study. The performance calculated in this study was based on the material-balance equation for gas reservoirs. The gas reservoir pressure was adjusted to the original GWC for the water-influx equation, and the captured gas in the water-invaded zone was accounted for in the watereded region. A constant reservoir permeability of 300 md was used in all calculations. The results showed that when ra / rg2, the effect of theaquifer on the gas reservoir performance can be neglected. Also, the rate at which the GWC advances are controlled by the aquifer size when ra / rg> 2. Finally, regardless of the reservoir size, when ra / rg & gt; 2, the pressure in the unsteady state water- The influx equation has to be corrected to the original GWC. Failure to do so could lead to an error of more than 3rd Iranian Petroleum Engineering Congress 100% in the cumulative water influx, which in turn could lead to wrong conclusions regarding the performance of the gas reservoir.

Zoning flooding by using GIS (Case Study: Marjan and Khosban basins, Alborz province)

Zoning flooding by using GIS (Case Study: Marjan and Khosban basins, Alborz province)

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Part of #Zoning flooding by using GIS (Case Study: Marjan and Khosban basins, Alborz province)# :

Publishing year : 2013

Conference : Second International Conference on Environmental Risks

Number of pages : 7

Abstract: Development of remote sensing techniques in various fields of management has provided access to a large amount of data in various areas of natural hazards management.Environmental planning and risk management are cases that are very well done by application of Geographic Information Systems ( GIS). The damage caused by naturaldisasters such as floods has increased in recent years in Iran. In this paper, the effects of geomorphological features on flooding were studied and compared by comparing thevariables effectiveness in the basin in the Marjan and Khosban sub-basins of the Taleghan Basin in the Alborz province. For this purpose, the morphometric features of these two sub-basins include: area, watershed length, form factor, elongation factor, main channel slope and time ofconcentration were studied, quantified and analyzed by Arc-GIS. The results show that the therunoff height in the Khosban sub-basin is more than Marjan's, and this is more productive aboutpeak discharge and runoff volume, therefore the structural measures set in this area should be more resistant. On the contrary, the reaction rate of runoff and flooding in the Marjan sub-basin is shorter in duration. So it is necessary to do more investigations on the effective parameterson flood and flood-prone areas and the main factor that can have the greatest impact onflooding should be identified and management actions need to be taken.

Investigating the Effect of Different Parameters on Fractured Reservoir’s Recovery

Investigating the Effect of Different Parameters on Fractured Reservoir’s Recovery

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Part of #Investigating the Effect of Different Parameters on Fractured Reservoir’s Recovery# :

Publishing year : 2014

Conference : The first national conference on development of oil and gas fields

Number of pages : 6

Abstract: Existence of fractures can impose some difficulties in understanding the mechanisms of oil recovery and subsequently reservoir simulation. There are some new mechanisms active in fractured reservoirs that do not exist in conventional ones. In this paper we investigate the effect of different parameters on oil recovery by simulating a typical fractured reservoir in the Eclipse software package. It is seen that very high production rates or small matrix blocks can drastically fall the Ultimate Recovery Factor (URF). Also in these cases, the transition period terminates faster and the reservoir produces mainly in pseudo-steady-state conditions. Block-to-block interaction (Re-Infiltration) is another threat to oil recovery, which shows that it would have a more dominant effect in some moderate oil production rates.

Forward to the future with lignocellulosic products using nanotechnology

Forward to the future with lignocellulosic products using nanotechnology

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Part of #Forward to the future with lignocellulosic products using nanotechnology# :

Publishing year : 2013

Conference : Second National Conference on Nanotechnology from theory to application

Number of pages : 6

Abstract: Studies on reviews of rapid growth and ever-increasing nanotechnology and recent developments in the field of fundamental changes that take place in a wide range of industries, which could be a promising new applications. Nowadays, many industries are producing lignocellulosic products for everyday needs in communication, training, packaging, construction, healthcare etc. The use of nanotechnology in the wood and paper industry due to the efficiency of wood, composite wood and pulp and paper production processes and efficiency, and anything that will lead to sustainable development and improve the lives of wood and paper.