Barite Sag Potential Determination and Management in Iranian High Pressure Directional Wells with New Experimental Apparatus

Barite Sag Potential Determination and Management in Iranian High Pressure Directional Wells with New Experimental Apparatus

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Part of #Barite Sag Potential Determination and Management in Iranian High Pressure Directional Wells with New Experimental Apparatus# :

Publishing year : 2011

Conference : Third National Congress of Petroleum Engineering

Number of pages : 15

Abstract: Barite sag is the undesirable fluctuations in mud weight that occurs due to downhole settling of the weighting agent. Barite sag has been exacerbated by the increased frequency of high-angle wells with the associated increase in particle settling rate, which occurs in directional wells. Settling of weighing materials can lead to problems such as stuck pipe, lost circulation, well control difficulties and poor cement jobs. Since the high-pressure deviations of torque and drag are high in comparison with vertical wells, oil-based muds are used to reduce the friction factor. High mud weight drilling fluidpreparation with oil based mud increases solid content and may cause some problems, for this reason in some oilfields such as Iran waterbase mud is used inevitably. In this paper, after setting up an experimental apparatus, the effect of inclination is investigated and the critical range isdetermined in static condition. The main purpose of this work is to manage the barite uptake due to the use of new water-based drilling fluid formulations. It is seen that the barite sag potential decreased using these drilling fluids

Site condition and earthquake; Survey of liquefaction, landslides and hazard mitigation

Site condition and earthquake; Survey of liquefaction, landslides and hazard mitigation

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Part of #Site condition and earthquake; Survey of liquefaction, landslides and hazard mitigation# :

Publishing year : 2008

Conference : Third National Conference on Rehabilitation and Rehabilitation of Iran

Number of pages : 10

Abstract: Observations of damages during numerous historical earthquakes have shown that in addition to structural stability, geological factors and site conditions also play a major role in the final stability of structures. Two important types of mentioned geotechnical phenomena that cause ground failure are liquefaction and landslides, which can take many forms: settlement, cracking and fissuring, sinking, surface fault displacement, etc. In the framework of this paper, the presentation of the fault and the effects of site conditions on the damage intensity are presented. This paper also investigates the geotechnical consideration of the Iranian code of seismic resistant design by studying on liquefaction and landslides characters, and finally, effective hazard reduction methods are presented.

In Silico Determination and Validation of PorA Structure and Ligand Binding Site as a vaccine candidate in Neisseria meningitidis

In Silico Determination and Validation of PorA Structure and Ligand Binding Site as a vaccine candidate in Neisseria meningitidis

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Part of #In Silico Determination and Validation of PorA Structure and Ligand Binding Site as a vaccine candidate in Neisseria meningitidis# :

Publishing year : 2015

Conference : Second International Conference on Science and Technology

Number of pages : 17

Abstract: Neisseria meningitidisis is a major cause of bacterial meningitis and septicemia worldwide. In the framework of a comprehensive vaccine against this organism, characterization of its variable surface antigens is important for epidemiological monitoring and vaccine development. The serologic characterization scheme for meningococci comprises the following: groups based on variations in the capsular polysaccharide; Types, based on variations of the PorB outer membrane protein (OMP); Subtypes based on variants of the PorA OMP; And immunotypes, based on variants in lipopoligosaccharide. Therefore, the development of an effective vaccine against serogroup B strains, which has been responsible for most infections in temperate states, may therefore require alternative approaches. The two major components of the OMV vaccine Are the meningococcal porin proteins encoded by porAnd porBgenes. In order to study the vaccine potential of individual outer membrane proteins, we analyze the PorB structure to identify the functional residues that are in the ligand bindig site.

Safety factor requirements for the offshore industry

Safety factor requirements for the offshore industry

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Part of #Safety factor requirements for the offshore industry# :

Publishing year : 2009

Conference : HSE International Conference on Oil and Gas Industry

Number of pages : 15

Abstract: The maintenance of structural integrity is a significant consideration in the safety management of offshore installations. Installations operating in the North Sea are primarily made of welded construction and are subject to severe environmental conditions, which cause significant fatigue loads. Thus, offshore installations are designed to resist structural failure from fatigue and extreme loading as well as other failure mechanisms, eg corrosion. Additionally, design to resist failure from accidental loading, such as fire and explosion and boat impact, is recognized as particularly important. The need to maintain safety standards is especially relevant in sites where there is an increasing population of installations that have exceeded their original design life and which subsequently require a reassessment to ensure that structural integrity is maintained throughout its life cycle.
The emphasis on safety highlights the need for appropriate structural integrity assessment procedures and the use of appropriate safety factors. A particularly important development has been the major international effort since 1993 to produce ISO standards for offshore structures. This has entailed the harmonization of relevant national codes and
standards and the development of new procedures, where appropriate, resulting in the derivation of revised safety
factors for offshore structures. The subject of safety factors within the ISO arena and in terms of the general
requirements for offshore structures is addressed in this paper.

Explaining Relationship Between Customer Orientation,Dimensions of Service Orientation and Job Satisfaction in Khorasan Razavi Water and Wastewater Co

Explaining Relationship Between Customer Orientation,Dimensions of Service Orientation and Job Satisfaction in Khorasan Razavi Water and Wastewater Co

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Part of #Explaining Relationship Between Customer Orientation,Dimensions of Service Orientation and Job Satisfaction in Khorasan Razavi Water and Wastewater Co# :

Publishing year : 2014

Conference : International Conference on Economics, Accounting, Management and Social Sciences

Number of pages : 17

Abstract: The quality of services rendered to customers has a crucial role in successful practices of an organization. Also, organizational service orientation influences job satisfaction of these employees in direct contact with customers, and since organizational service orientation is very important for creating and providing the highest quality services, this paper discusses the relationship between customer orientation and satisfaction of work by analyzing how to render Intermediary services in Khorasan Razavi Water and Wastewater Co. For this purpose, after drawing the analytical model of the research according to the data by Path Diagram, by running the Prelis program from LISREL software, we obtain a measurement model in which, using B coefficients and T test, some hypotheses are tested. The results, generally, showed the effect of customer orientation with service orientation in the job satisfaction of employees, and the intermediary role of service encounter practices and practices of human resources in employees' job satisfaction was accepted.

ANN Based Fault Location in Electrical Distribution System

ANN Based Fault Location in Electrical Distribution System

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Part of #ANN Based Fault Location in Electrical Distribution System# :

Publishing year : 2012

Conference : 7th Specialized Conference on Protection and Control of Power Systems

Number of pages : 7

Abstract: An Artificial Neural Network based fault location algorithm for distribution feeders is presented in this paper. The principle of the algorithm is quite simple and it only uses a phasor ofvoltage and current measured at the substation, but it can estimate the location of the fault with very good resolution. The first phase of voltage and current will be calculated and then according to the type of fault, the trained ANN estimates the fault location. According to the different types of faults, 3 differentANN's will be used for fault location estimation. The simulations were done in an IEEE 34 feeder test system and the results show that ANNs can estimate fault location with a good resolution for a wide range of fault resistance.

Multi-objective group hybrid flow shop scheduling problem with time lags and sequence-dependent setup times

Multi-objective group hybrid flow shop scheduling problem with time lags and sequence-dependent setup times

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Part of #Multi-objective group hybrid flow shop scheduling problem with time lags and sequence-dependent setup times# :

Publishing year : 2016

Conference : International Conference on Science and Engineering

Number of pages : 28

Abstract: This paper deals with the time lags and sequence-dependent setup times that have wide application in real-world. Most of the researches on operations scheduling problems have ignored time lags. A lot of researches about manufacturing scheduling have neglected group preparing time and time lags and / or considered the machine setup times independent of job sequences. This is a series of scheduling problems, which depends on the sequence and time lags among stations targeting simultaneously minimizing total weighted latency and maximum completion time. This type of manufacturing systems could be found in the metallurgy industry. Increasing the complexity of industrial problems makes traditional scheduling techniques inefficient. Meta-heuristic algorithms, calculations inspired by biology and other soft computing can be used to solve high-complexity problems and produce a reasonable production program at an acceptable time. Genetic algorithm is an intelligent technique for solving scheduling problems. This algorithm is based on genetic science and natural selection to optimize and search among choices to choose the best answer. In such problems we have a group of people born and grow in a condition to maximize their worthiness or minimize social costs. Also, the Artificial Immune System AIS algorithm is a computing system that is inspired by the immune system principles, functions and mechanisms. These two types of meta-heurists are used to solve a complex task-flow scheduling problem with a sequence-dependent set-up of time and time-lags targeting the minimization of total weighted latency and total completion time. The NSGAII is an efficient and effective algorithm to solve complex work shop flow group scheduling problems with sequence dependent setup time and time lags.

Correlation coefficient analysis (path analysis) and the direct and indirect effects of studied traits on alfalfa yield under normal and salinity stress conditions

Correlation coefficient analysis (path analysis) and the direct and indirect effects of studied traits on alfalfa yield under normal and salinity stress conditions

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Part of #Correlation coefficient analysis (path analysis) and the direct and indirect effects of studied traits on alfalfa yield under normal and salinity stress conditions# :

Publishing year : 2014

Conference : The First International Conference on New Findings in Agricultural Sciences, Natural Resources and the Environment

Number of pages : 5

Abstract: In order to evaluate and evaluate the salinity on the alfalfa, different traits under salinity, a factorial test was conducted in a randomized two-factor plot. The first factor appeared in 3 salinity levels and the second factor appeared in 3 repetitions of 5 alfalfa varieties. Statistical analysis of data showed a significant difference between varieties and care of studied traits in this step. Traits causality analysis of total dry showed that the yield was most directly affected by leaf dry weight and most indirectly influenced by leaf number by means of stomach numbers. The high correlation between the leaf numbers and the stem numbers confirms this result.

Production of exopolygalacturonase from wheat flour by Aspergillus awamori in submerged and surface culture fermentation

Production of exopolygalacturonase from wheat flour by Aspergillus awamori in submerged and surface culture fermentation

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Part of #Production of exopolygalacturonase from wheat flour by Aspergillus awamori in submerged and surface culture fermentation# :

Publishing year : 2009

Conference : National Symposium on Chemical Engineering

Number of pages : 9

Abstract: Pectinases are a group of hydrolytic enzymes that degrade pectic substances. They are produced by a variety of microorganisms including filamentous fungi. Studies were carried out on the production of exoplygalacturonase (exo-PGase) using wheat flour by Aspergillus awamori in submerged fermentation (SmF) and surface culture fermentation (SCF). Higher titres of exopolygalacturonase were observed when the medium was supplements with carbon (4 g / L Pectin for both SmF and SCF) and nitrogen (ammonium sulfate 6 g / L for both SmF and SCF) sources. SCF proved to be a better process than SmF for exopolygalacturonase production, giving the highest enzyme production rate in 96h. Exo-PGase produced by Aspergillus awamori provided optimum activity at pH 5 for SmF and 5.5 for SCF. Using a continuous system for exo-PGase production was obtained better than batch system.

Soil-Structure interaction in piled-raft foundation compound system

Soil-Structure interaction in piled-raft foundation compound system

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Part of #Soil-Structure interaction in piled-raft foundation compound system# :

Publishing year : 2012

Conference : Second national congress, earthquake and geotechnical conference

Number of pages : 10

Abstract: Soil-structure interaction refers to the interaction between a structure, its foundation and the subsoil. As the term soil-structure interaction covers a broad field, the work presented in this paper will be berestricted to the analysis of pit or piled-pit foundations under static loading. Piled-raft is a composite structure which consists of three elements: pile, raft and supporting soil. Loads applied to the raft are transferred to the soil through the piles. Therefore, it is necessary to take into account the interaction between the three elements. Four different types of interaction have to be considered in the analysis. In this paper, we discuss the interaction mechanism for piled-raft foundations and the use of finite layer technique for calculating interaction factors.