Original Research Article
Engineering
Andi Brous
Abstract
Distribution of distributed generation resources in distribution systems has several advantages, including reducing losses, improving voltage profiles, reducing pollution, and increasing system reliability. However, one of the most important points regarding the placement of these resources in distribution ...
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Distribution of distributed generation resources in distribution systems has several advantages, including reducing losses, improving voltage profiles, reducing pollution, and increasing system reliability. However, one of the most important points regarding the placement of these resources in distribution networks is economic issues and the return on investment and the increase in profits from the placement of these resources. On the other hand, due to the privatization of power systems, other distribution networks will not necessarily own the distributed generation resources. Therefore, despite choosing the location of scattered production resources by the owners of scattered production resources and pricing their production power, the selection of purchasing power from each of the scattered production units or the national electricity system is done by the distribution network operator. It will be for supply. Thus, owners of scattered production resources must choose the location and price of the production capacity of their resources in such a way that their profit is maximized and at the same time the amount of payment paid by the network operator is minimized. Therefore, in this paper, the issue of location and optimal pricing of distributed products is considered to increase the profit of the owner of scattered production resources provided that the distribution company pays the minimum payment cost and the method used to solve this problem is the ant-optimization algorithm. It is inspired by the ant's milk hunting mechanism and is a powerful optimization algorithm.
Original Research Article
Engineering
Reza Kolbadinezhad; Ebadollah Amouzad Mahdiraji
Abstract
Exposure to dust in the air is one of the most common environmental hazards in workshops that can have devastating effects on health. In this study, workers' exposure to particles in inhaled air by conventional methods as well as GIS has been investigated. The research was performed cross-sectionally-analytically ...
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Exposure to dust in the air is one of the most common environmental hazards in workshops that can have devastating effects on health. In this study, workers' exposure to particles in inhaled air by conventional methods as well as GIS has been investigated. The research was performed cross-sectionally-analytically and the sample size was determined through homogeneous exposure groups and environmental and individual exposure was performed based on standard methods and individual and environmental sampling methods. The obtained data were analyzed using GIS software to determine the distribution maps. In this paper, the mean concentration of exposure to dust for each individual in the matched exposure groups was 8.361 mg/m. The highest level of individual exposure was estimated in the powder operator with a value of 21313 mg/m3 and the lowest in the fine wire emperor with a value of 1.97 mg/m3. The minimum environmental concentration in the cutting hall was 0.305 mg/m and the maximum value was 22 mg/m3 in the powder hall. The results of the evaluation with AIHA criteria in all methods showed that weaving, material, and packaging halls have the highest concentration and cutting halls have the lowest dust concentration. Comparison with the GIS method showed that powdering, materializing, and packing halls have the highest concentration and cutting halls have the lowest dust concentration. Comparison with the GIS method showed that in this method, more people are classified in the risk area.
Original Research Article
Clinical Medicine
Andi Brous
Abstract
One of the most important goals in the color photography process is to reconstruct and translate colors faithfully and correctly, and if the photographer wants the colors to have unnatural effects in the image, this unfaithful translation must be predictable and completely under the control and desire ...
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One of the most important goals in the color photography process is to reconstruct and translate colors faithfully and correctly, and if the photographer wants the colors to have unnatural effects in the image, this unfaithful translation must be predictable and completely under the control and desire of the photographer. Special color photography filters are filters that serve these purposes. As mentioned, the process of translating and reconstructing colors depends on the topic of "color temperature".It is emphasized again that the correct translation of colors in a color image is achieved when the color temperature of the light used is completely consistent with the color quality of the emulsion used. Different types of special color photography filters are actually color temperature filters that change the sum of the three colors of blue, red and green in the light or each of these three colors by different images.
Original Research Article
Engineering
Ebadollah Amouzad Mahdiraji; Mojtaba Sedghi Amiri
Abstract
Nowadays, to involve wind turbines in controlling the network frequency, drop and inertia control methods are usually used for variable speed wind turbines. Adjusting the benefits of droop and inertia control loops is very effective on the performance of wind turbines, but due to the variability of wind ...
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Nowadays, to involve wind turbines in controlling the network frequency, drop and inertia control methods are usually used for variable speed wind turbines. Adjusting the benefits of droop and inertia control loops is very effective on the performance of wind turbines, but due to the variability of wind speed and network conditions, adjusting the control coefficients that produce the best response in all conditions is impossible. In this paper, a new method for the comparative regulation of the gain of the droplet control loops and the inertia of the doubly-fed induction generator (DFIG) is presented. Also, due to the relief of problems and shortcomings of wind turbine and network modeling, the use of a data-driven method, which operates only on the input and output of the system, has been proposed. In the new idea presented for faster control and prevention of sharp frequency droop, new equations have been calculated to update the coefficients of the control loops using the second fault derivative, which is used in the comparative adjustment of the gain of the droop and inertia control loops. In the proposed control method, the next instantaneous output is first estimated using KVNN and then the coefficients of the frequency control loops are adjusted adaptively using the Hessian matrix. The simulation results for a DFIG wind farm show the proper performance of an adaptive method based on data-driven control in increasing the minimum frequency and improving the network frequency in a permanent and transient state when a fault occurs.
Original Research Article
Engineering
Sergey Brindred; Minoo Akhtarian Zand
Abstract
The stability of the power system is essential to ensure its proper functioning. In recent years, Flexible AC Transmission Systems have been considered as one of the effective methods to improve the control ability of the power system and power transition constraints. One of the devices of the parallel ...
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The stability of the power system is essential to ensure its proper functioning. In recent years, Flexible AC Transmission Systems have been considered as one of the effective methods to improve the control ability of the power system and power transition constraints. One of the devices of the parallel flexible alternating current transmission systems is STATCOM which can improve the power system dynamic and transient voltage stability. In this study, a new method for designing the damping controller was proposed to improve the transient power system stability in a single machine network connected to an infinite bus. The STATCOM controller problem in a wide area of the system function was considered as an optimization problem with multi-purpose objective function. Also, the Honey Bee Mating Optimization Algorithm was used to determine its parameters.
Original Research Article
Basic Medicine
Andi Brous
Abstract
The invention of photography made it possible for objects, places, landscapes and even ordinary people around us to play a symbolic role and have a clear effect on the mental path of meaning-making and content-making. Seeing these ordinary natural objects with the eye, while it may be emotional or even ...
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The invention of photography made it possible for objects, places, landscapes and even ordinary people around us to play a symbolic role and have a clear effect on the mental path of meaning-making and content-making. Seeing these ordinary natural objects with the eye, while it may be emotional or even reminiscent of memory, can be less symbolic, meaningful, or content-creating, leading the mind to a truth beyond the subject itself unless the eye that sees is the eye of truth. Be between mystics. However, if the same objects, landscapes and subjects are present in a photo frame with their different visual forms and characteristics, they will rise above their individuality, and will have the status of a typical sample (general sample). A tree is a specific tree that has grown in a certain place before it is placed in the camera frame, but by placing it in the photo of the general sample of all similar trees, it will recreate the general meaning of the tree. Thus, when an object is present in a photograph, it gains more credibility than its individuality, and therefore can have a more specific effect, as well as a stronger symbolism or deeper meaning.
Original Research Article
Clinical Medicine
Kamal Malmal; Negin Shiri
Abstract
In photography, emulsions that are proportionate to the light must be used. If we use daylight, we must use emulsions that are set to a color temperature of 5500 degrees Kelvin (which is the temperature of daylight). Otherwise, incorrect translation of colors will take place. For this reason, in color ...
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In photography, emulsions that are proportionate to the light must be used. If we use daylight, we must use emulsions that are set to a color temperature of 5500 degrees Kelvin (which is the temperature of daylight). Otherwise, incorrect translation of colors will take place. For this reason, in color photography, different emulsions are made, each of which is set to capture an image with a specific light (light with a specific color temperature). This emulsion is formulated for use with light whose color temperature is 5500 degrees Kelvin. Since the most famous light that has such a color temperature is daylight, this type of emulsion is called daylight emulsion. This type of color emulsion is produced with little difference for both photography and cinema. In color filmmaking, another non-professional scale emulsion was used in the past, known as the G-type emulsion, which could provide almost accurate color translation if used with light at temperatures between 3200 ° K and 5500 ° K. In fact, this type of emulsion was designed to cover a variety of "color temperatures" from 3200 to 5500 degrees Kelvin, but this type of coating and adaptation was not perfect, and the color translation seemed almost correct, and therefore There was no professional application of this type of emulsion. This type of emulsion is not very popular today.
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