لوله

Open Access Article

1 - Medial-axis Enhancement of Tubular Structures and its Application in the Extraction of Portal Veins
amirhossein forouza reza aghaeizade youshi sato masa houri

I In this paper, a new filter is designed to enhance medial-axis of tubular structures. Based on a multi-scale method and using eigenvectors of Hessian matrix, the distance of a point to the edges of the tube is found. To do this, a hypothetical line with a deliberate d More

I In this paper, a new filter is designed to enhance medial-axis of tubular structures. Based on a multi-scale method and using eigenvectors of Hessian matrix, the distance of a point to the edges of the tube is found. To do this, a hypothetical line with a deliberate direction is passed through the point which cuts the tube at its edges. For points which are located on the medial-axis, this distance is symmetric with respect to any deliberate direction. We find samples of the distances in different directions and assign a measure to the points based on this symmetry property. The output of this step is an enhanced image in which noise is removed and tubes can be seen more clearly. Then, we employ the filter developed by Pock et al. to enhance medial axis. Evaluation of the proposed method is performed using 2D/3D synthetic/clinical datasets both quantitatively and qualitatively. Manuscript profile

Open Access Article

2 - Reinforcement of the central axis of tubular structures and its application in extracting the central axis of the portal vein
amirhossein forouza reza aghaeizade یوشی¬نبو ساتو ماساتوشی هوری

In this article, by presenting a new description of the characteristic of the central axis points of tubular structures, a method to strengthen these structures is proposed. In this method, in a multi-scale framework and using special vectors of the Hessian matrix of th More

In this article, by presenting a new description of the characteristic of the central axis points of tubular structures, a method to strengthen these structures is proposed. In this method, in a multi-scale framework and using special vectors of the Hessian matrix of the image points, we obtain the distance of each point from the edges of the image. For the points located on the central axis, this distance from the bisector of any arbitrary direction is symmetrical. In this step, by sampling the distance of each point from the edges of the image in different directions, we assign a greater value to the points that have more symmetry. In the next step, we use a filter based on the Pock method to strengthen the central axis of the tubes. The evaluation of the proposed method has been done using two-dimensional and three-dimensional phantom images and medical data qualitatively and quantitatively with the criteria of maximum error in determining the central axis and detection rate, which shows the advantage of this method over the existing methods. Manuscript profile

Open Access Article

3 - Aggregate Production Planning Of L.M.I Corporation Using Grey Goal Programming Approach
سید محمد‌علی خاتمی فیروز‌آبادی وحید پیری

Nowadays, the organizations’ success depends on planning. The purpose of medium term production planning is optimum usage of human resource, equipment, and capacity to meet demand during a given period. Always, in the organizations, there are multiple and sometimes con More

Nowadays, the organizations’ success depends on planning. The purpose of medium term production planning is optimum usage of human resource, equipment, and capacity to meet demand during a given period. Always, in the organizations, there are multiple and sometimes conflicting goals in planning. On the other hand, production planning models should be designed so that to be able to deal with uncertainty and lack of information. Grey goal programming technique is the way that not only consider multiple and conflicting goals but also it is able to deal with uncertainty and lack of information. In this research, in order to develop the L.M.I Company’s medium - term production planning is used grey goal programming model. Manuscript profile

Open Access Article

4 - Design and Implementation of Two Pipeline Architectures for Computing High-Order Moments of Grey-Level Images
M. Monajati E. Kabir

Moments are utilized in image processing for pattern recognition, machine vision and numerous feature extraction techniques. Due to computational complexity, it is difficult to use high order moments in real time processing. This paper presents the design of two new arc More

Moments are utilized in image processing for pattern recognition, machine vision and numerous feature extraction techniques. Due to computational complexity, it is difficult to use high order moments in real time processing. This paper presents the design of two new architectures for real time computation of moments, up to order 14, M00 to M77, in gray level images, based on parallel systolic arrays and pipelining technique, using a 0.18μm CMOS technology. Implementation of the moment processing element (MPE) of the first architecture illustrates a processing speed of 125 frames/s for 1024×1024 grey-level images. The maximum operating frequency and the power consumption for an architecture with 5 elements is 133 MHz and 14.36 mW, respectively. Since the design is very low power, the number of parallel MPE’s can be easily increased. Simulation shows that with 11 parallel MPE’s, the first 49 moments of 1024×1024 image are computed with the speed of 30 frames/sec. To further decrease the latency of the first architecture, the second architecture is proposed, in which the add operation is performed only with a single adder and a compressor. Simulation shows that the latency of the second architecture is 3.3 times lower than that of the first architecture. Implementation of the second architecture illustrates the maximum operating frequency and the power consumption of 125 MHz and 58.34 mW, respectively. Operating frequency and power consumption of the second architecture is approximately the same as that of the first architecture which befit real time applications. Manuscript profile

Open Access Article

5 - A New High Speed Easily Expandable Digital Multiplication Algorithm without Pipeline
ebrahim hosseini Morteza Mousazadeh

This paper proposes a new high speed low power algorithm for unsigned digital multiplier without pipeline which could be easily expanded to a wider number of bits. The blocks of multiplier works in parallel which significantly increase the speed of multiplier. In propos More

This paper proposes a new high speed low power algorithm for unsigned digital multiplier without pipeline which could be easily expanded to a wider number of bits. The blocks of multiplier works in parallel which significantly increase the speed of multiplier. In proposed algorithm, the input bits of multiplier, are divided into smaller groups of bits which multiplication of these groups are in parallel and simultaneously. This division continues until the minimum number of input bits which is 2×2. In calculating the product of each category, the proposed algorithm is used, which leads to acceleration of the product of each category.The final result will be obtained from the sum of these smaller categories.Modified tree adder have been used to add smaller groups, which can increase the multiplication speed. Multipliers with input bit lengths of 64, 32, 16, 8, 4, and 2 have been implemented using the proposed algorithm in 180 nm and 90 nm technology, which its delay and power consumption with bit length of 32 in 180 nm are 3.05 ns and 40 mW respectively. In 90 nm technology and with the 32 bit length the delay is 1.53 nm and power consumption is 9.7 mW. Also, using the proposed method, it is estimated that the delay of 128×128 bits multiplier in the 180 nm and 90 nm technology are equal to 5.4ns and 2.5ns, respectively. According to the results and in comparison with other works reported in the articles and in the same process, without increasing the power consumption and with a silicon area of 1.5 times, the proposed multiplication speed has increased more than 2 times. Manuscript profile

Open Access Article

6 - Determination of In-situ stress in the Marun oilfield’s failure wells
میثم فارسی مدان مرتضی احمدی کاوه آهنگری جاسم دشت بزرگی

Abstract Determination of In-situ stress domain in oilfields is so important for drilling, well completion and petroleum geomechanics. Simply, determination of magnitude and direction of In-situ stress around wellbore is the first step of geomechanical studies and we More

Abstract Determination of In-situ stress domain in oilfields is so important for drilling, well completion and petroleum geomechanics. Simply, determination of magnitude and direction of In-situ stress around wellbore is the first step of geomechanical studies and wellbore stability particularly. Preliminarily, because of importance of casing collapse problem in the Marun oilfield, the magnitude of in-situ stress is determined. The magnitude of vertical stress (Sv) was in range of 85 to 90 MPa. The minimum horizontal stress (Shmin) determined by some analytical methods. For estimating of maximum horizontal stress (SHmax) domain we used Anderson’s faulting theory and stress polygon. So the magnitude of SHmax was so close to Sv and the faulting regime shows normal/strike slip. Within Gachsaran Formation in depth of collapses because of salty lithology and high pore pressure, magnitude of In-situ stress is so close and it can be assume hydrostatic stress state. Manuscript profile

Open Access Article

7 - Effect of multi-walled carbon nanotubes to improve hydrocarbon wells annular clearance space
Mohammad سلیمانی سعیده رعیت دوست

Proper drilling fluids has vital role for achieving to hydrocarbon reservoirs by using Drilling operation. Some important problems such as friction, stuck pipe, slow drilling rate, high torque and drag, lost of materials, density variation of mud can be happened due of More

Proper drilling fluids has vital role for achieving to hydrocarbon reservoirs by using Drilling operation. Some important problems such as friction, stuck pipe, slow drilling rate, high torque and drag, lost of materials, density variation of mud can be happened due of poor hole annulus and cuttings down falling that induce expensive drilling. Various drilling fluids have been widely used in the wells drilling to improve lifting capacity of drilled cuttings. In this paper, the experimental results have been studied that conducted on effect of Multiwall Carbon Nano tubes (MWNTs) as additives for lifting capacity of water based mud. The effect of Useful parameters such as amount of MWNTs used, cutting size and mud annular velocity on the drilling fluid cleaning capacity have been studied. The results show that lifted cuttings increase as the amount of MWNTs added increases. MWNTs associated with water based mud displays the stability against base mud since surface forces easily balance the gravity force and attached to drilled cuttings, resulting in increase of drag force acts to drilled cuttings and easily lifted cuttings to the surface. The MWNTs also will improve viscosity which will significantly increase carrying capacity of the mud. For small and medium cuttings, the improvement relatively simplified compare to the big cuttings. The impact will significantly Manuscript profile

Open Access Article

8 - Introduction and technical and economic evaluation of preparation and installation of GRP pipes
amene fatehi yaghob zoalfeghary

The growing trend of construction projects, including water supply and sewerage lines, as well as the willingness of employers and investors to use new technologies requires careful technical evaluation and economics in accepting new materials and technologies before im More

The growing trend of construction projects, including water supply and sewerage lines, as well as the willingness of employers and investors to use new technologies requires careful technical evaluation and economics in accepting new materials and technologies before implementation, because this can avoid negative risks that lead to costs. One of the new materials that is used in water supply, sewerage and water transmission lines with high acidity has significantly increased GRP pipe, which due to the important characteristics of the pipe index, the position against corrosion, no need for Internal and external coatings and cathode protection and light weight have provided the acceptance of this pipe for a suitable replacement of pipes (steel, concrete, asbestos and diameters larger than 400 mm polyethylene). The cost of drilling and placement of the pipe in the drilling method is higher than the cost of preparing and purchasing the pipe for pipe check due to GRP reinforcement for use in the pipe jacking method is more than the open drilling method. The use of GRP pipes is a very good solution, considering that the country produces special GRP pipes, so the use of trenchless drilling can be economical in reducing the social and environmental problems that we see open drilling. Manuscript profile

Open Access Article

9 - Investigation of corrosion of metals in oil pipes: a case study of Gachsaran Oil Company
Omid Fard ali aram

Analysis of a dynamic light scattering instrument "Wyatt DynoproNanoStar" was used to detect the accumulation of surfactant in the oil phase. Triple measurements were performed for each sample and at least two samples were tested for each level of surfactant concentrati More

Analysis of a dynamic light scattering instrument "Wyatt DynoproNanoStar" was used to detect the accumulation of surfactant in the oil phase. Triple measurements were performed for each sample and at least two samples were tested for each level of surfactant concentration to ensure reproducibility. The detection temperature was controlled at the same temperature by segmentation experiments. The accumulation properties of BAC surfactant in toluene were investigated using DLS and samples were presented in Figure 3, including the total radius and intensity of the collected light signal, C12, C14, and toluene C16, from the oil phase in the water-oil partitioning equilibrium from the surface. Net BAC was sampled. As can be seen, both the particle radius and the intensity of the C12 and C14 signals varied sharply within the evaluated concentration range, indicating that C12 and C14 do not form micelles in toluene. In this research, a multi-physical model, integrated corrosion inhibition model (ICI), is presented theoretically and empirically to evaluate integrated water-oil separation, aggregation, adsorption / desorption, and corrosion inhibition of mixed surfactant inhibitors in water-containing oils. We pay salt in Gachsaran Oil Company. Steel Pipe Environments (WOS). The ICI model is based on three main sub-models that consider water-oil surfactant classification, micellation, effective adsorption / desorption on the substrate, surfactant type, surfactant-solvent interactions, surfactant-contrion pair, and side surfactant interactions, etc. opnions have been asked. Acts as a basic framework in the design, selection, optimization, and use of various pure and mixed surfactant inhibitors in WOS environments. In summary, a comprehensive model, the ICI model, has been theoretically developed and empirically validated to evaluate the partitioning, aggregation, and corrosion inhibition of surfactant (both homologous and inhomogeneous) inhibitors (water-containing) and oil-steel pipe. Manuscript profile

Open Access Article

10 - -
Amirhosein Yazdanbakhsh

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- Manuscript profile

Open Access Article

11 - Modeling the behavior of polymer matrix composite pipes carrying fluid exposed to hydrocarbon fire
Alireza Rahimi Ehsan Selahi

Despite the very good mechanical properties of composite materials, the strength of these materials is not suitable for heat resistance. Therefore, due to the increasing use of composite pipes, especially in the oil, gas and petrochemical industries, fire analysis in th More

Despite the very good mechanical properties of composite materials, the strength of these materials is not suitable for heat resistance. Therefore, due to the increasing use of composite pipes, especially in the oil, gas and petrochemical industries, fire analysis in these pipes is very important. The most important goal of this research was to investigate the effects of fire on the strength of composite pipes and their failure time by performing a numerical thermal-mechanical analysis for a fluid-carrying composite pipe using MATLAB software. At the first step thermal modeling is carried out and heat distribution, due to the hydro carbonian fire, in the composite pipes is determined in terms of the location and time and then in the mechanical modeling stage, the loss of mechanical properties of the composite pipe due to this increase in temperature is calculated and considering the stresses from the fluid inside the pipe as well as thermal stresses have been created, the total stresses have been calculated. This Thermo-Mechanical model has been validated with the results found in valid articles and used to analyze the behavior of a fluid-carrying composite pipe exposed to hydrocarbon fire. Finally, the Tsai–Wu failure theory was employed to determine the failure time of the pipe in the above-mentioned conditions. By estimating the failure time of the composite pipe, it was possible to determine the pressure bearing capacity and failure time of pressurized composite pipes subjected to fire Manuscript profile

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