-
Open Access Article
1 - Investigation of the ability for removal of methylene blue cationic dye in aqueous samples using synthetic polymers
Marzieh Hasanzadeh Fariba OstovarIn this research, the ability for removal of methylene blue cationic dye using Electro active polymers based on polypyrrole (PPy) and poly (3-methylthiophene) (P3MTh) in a batch system were studied. Sawdust (SD) was made from wood, after patching, as a holder for coatin MoreIn this research, the ability for removal of methylene blue cationic dye using Electro active polymers based on polypyrrole (PPy) and poly (3-methylthiophene) (P3MTh) in a batch system were studied. Sawdust (SD) was made from wood, after patching, as a holder for coating polymers and Sodium Dodecyl Sulfate Anionic Surfactant (SDS) was used to modify the surface of the sawdust. The effects of some important parameters such as pH, initial concentration of dye and contact time were investigated. To evaluate the obtained data, adsorption isotherm curves (Langmuir and Freundlich) were used. The adsorption efficiency for methylene blue was maximized at alkaline pH. Adsorption capacity increased with increasing initial concentration and contact time. In all cases, the adsorption process complies with Langmuir isotherm and represents the homogeneous and single-layer process. Also, the adsorption capacity obtained in SD/PPy, SD /PPy / SDS and SD / P3MTh polymers were 59/52, 400 and 1000 mg/g, respectively. Based on the studies and the results obtained in this study, it was found that these polymer materials can effectively be used in waste dyes, such as textile industry, which they have the great environmental significance. Manuscript profile -
Open Access Article
2 - Investigating the Effect of Surface Water in Sacred Defense Operations on the South Front
usef hemati علی امیری hamed abaciOne of the wars that have occurred in Iranian history is the extensive attack of the neighboring country, Iraq, which lasted from 1980 to 1987. In this period, which is mentioned in Iranian sources under the title of the Holy defense, there are offensive and defensive o MoreOne of the wars that have occurred in Iranian history is the extensive attack of the neighboring country, Iraq, which lasted from 1980 to 1987. In this period, which is mentioned in Iranian sources under the title of the Holy defense, there are offensive and defensive operations in the western border of Iran that can be divided into three Northern, Middle and South fronts. The most important and decisive operations of the war parties took place on the southern front, which is extended from the south of Mehran to Abadan and Ras al-Bisheh. Since the hydrological and geomorphological conditions of this front are such that it is possible to use water tactics or hydraulic warfare, this research has been developed to study the effect of surface water on the operations carried out there. How to collect information this research is based on its nature. That is, according to its historical nature, it has been compiled with library and documentary methods. The obtained data were analyzed by descriptive-analytical method. The results showed that surface waters such as rivers, Hores and canals of water and dams in all phases of offensive operations, including designing, implementation and support, and especially defensive operations have had influential role and in each operation, have influenced several principles of nine principles of war. Manuscript profile -
Open Access Article
3 - The effect of changes in land use and reducing urban green space on surface temperatures and the urban heat island of Tehran (Case study: Region 1)
Sahar Mansouri شهريار خالدي Reza برنا farideh AsadianThis study was conducted to investigate the microclimate role of extruded builders in the last decade on surface temperature rise and heat island resonance and air pollution in the Tehran area. Shemiranat station data and Aqdasia air pollution measurement data over a 12 MoreThis study was conducted to investigate the microclimate role of extruded builders in the last decade on surface temperature rise and heat island resonance and air pollution in the Tehran area. Shemiranat station data and Aqdasia air pollution measurement data over a 12 year statistical period were used. Landsat 8 satellite images were used to reveal the role of vegetation reduction on surface temperature. The results showed that in area 1 due to non-regular and unconditional construction in recent decades, the vegetation and trees of the area were not cut or standard green space development was not followed. Two hot areas, or islands of high surface temperature heat, are forming and developing over other adjacent parts. The eastern half of Region 1, especially its southeastern part, boasts a very hot part in all seasons. In hot seasons, surface temperatures in the area can reach as high as 50 degrees Celsius. The middle section is still better off if it still manages to maintain its green space. However, due to the steady growth of builders in the last decade, the minimum (morning) temperatures, especially in cold seasons, are rising rapidly and steeply. The amounts of fine-grained particles, especially PM10 and PM2, are increasing in region 1.The intensification of the heat island has caused south-west to south-southeast winds to intensify all months of the year. And it has made the area particularly polluted in the colder months of the year. The purpose of this study was to investigate the role of changes in land use and deforestation and loss of vegetation in changes in surface temperature and heat island of Tehran metropolitan area. Manuscript profile -
Open Access Article
4 - Design and construction of minipiezometers to determine surface water-groundwater interactions
Behzad Hammamipour BaranjiUnderstanding the interactions of ground water and surface water is one of the most important challenges among hydrogeologists. Hydraulic gradient between ground water and surface water, as well as hydraulic conductivity of streambed sediments are required to determine MoreUnderstanding the interactions of ground water and surface water is one of the most important challenges among hydrogeologists. Hydraulic gradient between ground water and surface water, as well as hydraulic conductivity of streambed sediments are required to determine ground water and surface water exchanges. Minipiezometers are simple instruments that measure flow direction and hydraulic gradients between ground water and surface water. Often temporarily installed, minipiezometers are essentially small-scaled versions of piezometers, which are commonly used to make groundwater level measurements. By combining water table data with surface water level measurements, flow direction can be determined. Minipiezometers are typically used in the areas where many measurements are required. Commercial minipiezometers are available, but they are very expensive. The purpose of this paper is to design and construc a low-cost minipiezometer for measuring ground water and surface water exchanges. In this study, a minipiezometer was made by simple and available materials such as steel pipe, steel 3NPSoft rob, clear plastic hose, gas valves, hand vacuum pump, hammer, U-shape clear tubing, graduated manometer board, and graduated transparent plastic cylinder and was successfully tested in the Soleghan River in the west of Tehran. Manuscript profile -
Open Access Article
5 - Design and construction of minipiezometers to determine surface water-groundwater interactions
Behzad Hammamipour Baranji Gholam Abbas Fanaei Kheirabad Delkhahi Hatefi Mokhtar karami NajibiUnderstanding the interactions of ground water and surface water is one of the most important challenges among hydrogeologists. Hydraulic gradient between ground water and surface water, as well as hydraulic conductivity of streambed sediments are required to determine MoreUnderstanding the interactions of ground water and surface water is one of the most important challenges among hydrogeologists. Hydraulic gradient between ground water and surface water, as well as hydraulic conductivity of streambed sediments are required to determine ground water and surface water exchanges. Minipiezometers are simple instruments that measure flow direction and hydraulic gradients between ground water and surface water. Often temporarily installed, minipiezometers are essentially small-scaled versions of piezometers, which are commonly used to make groundwater level measurements. By combining water table data with surface water level measurements, flow direction can be determined. Minipiezometers are typically used in the areas where many measurements are required. Commercial minipiezometers are available, but they are very expensive. The purpose of this paper is to design and construc a low-cost minipiezometer for measuring ground water and surface water exchanges. In this study, a minipiezometer was made by simple and available materials such as steel pipe, steel 3NPSoft rob, clear plastic hose, gas valves, hand vacuum pump, hammer, U-shape clear tubing, graduated manometer board, and graduated transparent plastic cylinder and was successfully tested in the Soleghan River in the west of Tehran. Manuscript profile -
Open Access Article
6 - The Analysis of Conflict of Tradition and Modernity in Social Novel after Islamic Revolution in Iran
مریم عاملی رضاییSocial Novel is an applicatory area to reflect and recreate social realities in the mirror of literature. The challenge between tradition and modernity is one the themes that is reflected in the Persian literature from the constitutional monarchy and is reflected in an MoreSocial Novel is an applicatory area to reflect and recreate social realities in the mirror of literature. The challenge between tradition and modernity is one the themes that is reflected in the Persian literature from the constitutional monarchy and is reflected in an appropriate manner with social changes of every era. After the Islamic Revolution of Iran, social novel experienced considerable quantitative and qualitative growth and there is few novels which in this time which has not expressed social themes. The main problem of this study is reviewing the conflict of tradition and modernity concepts in social novels after the Islamic Revolution. The purpose of this study is comparative reviewing and comparing of the authors’ approach toward this issue in the three decades from 1360 to 1390 (1981 to 2011). This study is done applying descriptive-analytic method and using library resources. The result of this research shows that in Novels of 1360 to 1370 (1981 to 1991) this conflict is reflected in a clear and manifest manner particularly in objection to industrialization, the material looks of modernity and losing traditions, but in 1370 to 1390 (1991 to 2011) this experience is internalized and is manifested in form of suspicion, wandering, and traditionalism. However, the acceptance of changes of first decade which were regarded as serious challenges in second and third decade shows the flourishing movement toward modernity particularly in city communities and educated group. Manuscript profile -
Open Access Article
7 - Studying the Binary Oppositions in the Structure of Sanaie's Hadiqa
محمد امير عبيدينيا علي دلائي ميلان'Binary oppositions' is considered as one of the basic concepts of structural and post-structural critique, and theories of linguistics and semiotics. It is rooted in mythological and cultural beliefs of the humans. Binary oppositions can be found throughout Hadiqa. At More'Binary oppositions' is considered as one of the basic concepts of structural and post-structural critique, and theories of linguistics and semiotics. It is rooted in mythological and cultural beliefs of the humans. Binary oppositions can be found throughout Hadiqa. At the level of its surface structure, the phrases, headings, the relations between lines and their arrangements show binary oppositions. At its deep structure, there can be found such oppositions among the successively expressed contents. At the surface structure of its narratives, the characters are of binary oppositions. Their deep structure also centers on this concept. The present article first studies and analyzes the term 'binary oppositions' concerning with different theories, and then classifies the origins of the binary oppositions in both the surface and deep structures of Hadiqa, especially considering its characterization. Manuscript profile -
Open Access Article
8 - EBG Structures Properties and their Application to Improve Radiation of a Low Profile Antenna
Masoumeh Rezaei Abkenar Pejman RezaeiIn this paper we have studied the characteristics of mushroom-like Electromagnetic Band Gap (EBG) structure and performance of a low profile antenna over it. Afterward, a novel EBG surface is presented by some modifications in mushroom-like EBG structure. This structure MoreIn this paper we have studied the characteristics of mushroom-like Electromagnetic Band Gap (EBG) structure and performance of a low profile antenna over it. Afterward, a novel EBG surface is presented by some modifications in mushroom-like EBG structure. This structure, which has more compact electrical dimensions, is analyzed and its electromagnetic properties are derived. Results show that resonant frequency of this novel structure is about 15.3% lower than the basic structure with the same size. Moreover, the novel EBG structure has been used as the ground plane of antenna. Its application has improved radiation of a low profile dipole antenna. The antenna performance over the new EBG ground plane is compared with the conventional mushroom-like EBG structure. Simulation results show that using this slot loaded EBG surface, results in 13.68dB improvement in antenna return loss, in comparison with conventional mushroom-like EBG, and 33.87dB improvement in comparison with metal ground plane. Besides, results show that, EBG ground planes have increased the input match frequency bandwidth of antenna. Manuscript profile -
Open Access Article
9 - The Surfer Model with a Hybrid Approach to Ranking the Web Pages
Javad Paksima Homa KhajehUsers who seek results pertaining to their queries are at the first place. To meet users’ needs, thousands of webpages must be ranked. This requires an efficient algorithm to place the relevant webpages at first ranks. Regarding information retrieval, it is highly impor MoreUsers who seek results pertaining to their queries are at the first place. To meet users’ needs, thousands of webpages must be ranked. This requires an efficient algorithm to place the relevant webpages at first ranks. Regarding information retrieval, it is highly important to design a ranking algorithm to provide the results pertaining to user’s query due to the great deal of information on the World Wide Web. In this paper, a ranking method is proposed with a hybrid approach, which considers the content and connections of pages. The proposed model is a smart surfer that passes or hops from the current page to one of the externally linked pages with respect to their content. A probability, which is obtained using the learning automata along with content and links to pages, is used to select a webpage to hop. For a transition to another page, the content of pages linked to it are used. As the surfer moves about the pages, the PageRank score of a page is recursively calculated. Two standard datasets named TD2003 and TD2004 were used to evaluate and investigate the proposed method. They are the subsets of dataset LETOR3. The results indicated the superior performance of the proposed approach over other methods introduced in this area. Manuscript profile -
Open Access Article
10 - Improved Generic Object Retrieval In Large Scale Databases By SURF Descriptor
Hassan Farsi Reza Nasiripour Sajad MohammadzadehNormally, the-state-of-the-art methods in field of object retrieval for large databases are achieved by training process. We propose a novel large-scale generic object retrieval which only uses a single query image and training-free. Current object retrieval methods req MoreNormally, the-state-of-the-art methods in field of object retrieval for large databases are achieved by training process. We propose a novel large-scale generic object retrieval which only uses a single query image and training-free. Current object retrieval methods require a part of image database for training to construct the classifier. This training can be supervised or unsupervised and semi-supervised. In the proposed method, the query image can be a typical real image of the object. The object is constructed based on Speeded Up Robust Features (SURF) points acquired from the image. Information of relative positions, scale and orientation between SURF points are calculated and constructed into the object model. Dynamic programming is used to try all possible combinations of SURF points for query and datasets images. The ability to match partial affine transformed object images comes from the robustness of SURF points and the flexibility of the model. Occlusion is handled by specifying the probability of a missing SURF point in the model. Experimental results show that this matching technique is robust under partial occlusion and rotation. The properties and performance of the proposed method are demonstrated on the large databases. The obtained results illustrate that the proposed method improves the efficiency, speeds up recovery and reduces the storage space. Manuscript profile -
Open Access Article
11 - Eye Gaze Detection Based on Learning Automata by Using SURF Descriptor
Hassan Farsi Reza Nasiripour Sajad MohammadzadehIn the last decade, eye gaze detection system is one of the most important areas in image processing and computer vision. The performance of eye gaze detection system depends on iris detection and recognition (IR). Iris recognition is very important role for person iden MoreIn the last decade, eye gaze detection system is one of the most important areas in image processing and computer vision. The performance of eye gaze detection system depends on iris detection and recognition (IR). Iris recognition is very important role for person identification. The aim of this paper is to achieve higher recognition rate compared to learning automata based methods. Usually, iris retrieval based systems consist of several parts as follows: pre-processing, iris detection, normalization, feature extraction and classification which are captured from eye region. In this paper, a new method without normalization step is proposed. Meanwhile, Speeded up Robust Features (SURF) descriptor is used to extract features of iris images. The descriptor of each iris image creates a vector with 64 dimensions. For classification step, learning automata classifier is applied. The proposed method is tested on three known iris databases; UBIRIS, MMU and UPOL database. The proposed method results in recognition rate of 100% for UBIRIS and UPOL databases and 99.86% for MMU iris database. Also, EER rate of the proposed method for UBIRIS, UPOL and MMU iris database are 0.00%, 0.00% and 0.008%, respectively. Experimental results show that the proposed learning automata classifier results in minimum classification error, and improves precision and computation time. Manuscript profile -
Open Access Article
12 - Drone Detection by Neural Network Using GLCM and SURF Features
Tanzia Ahmed Tanvir Rahman Bir Ballav Roy Jia UddinThis paper presents a vision-based drone detection method. There are a number of researches on object detection which includes different feature extraction methods – all of those are used distinctly for the experiments. But in the proposed model, a hybrid feature extrac MoreThis paper presents a vision-based drone detection method. There are a number of researches on object detection which includes different feature extraction methods – all of those are used distinctly for the experiments. But in the proposed model, a hybrid feature extraction method using SURF and GLCM is used to detect object by Neural Network which has never been experimented before. Both are very popular ways of feature extraction. Speeded-up Robust Feature (SURF) is a blob detection algorithm which extracts the points of interest from an integral image, thus converts the image into a 2D vector. The Gray-Level Co-Occurrence Matrix (GLCM) calculates the number of occurrences of consecutive pixels in same spatial relationship and represents it in a new vector- 8 × 8 matrix of best possible attributes of an image. SURF is a popular method of feature extraction and fast matching of images, whereas, GLCM method extracts the best attributes of the images. In the proposed model, the images were processed first to fit our feature extraction methods, then the SURF method was implemented to extract the features from those images into a 2D vector. Then for our next step GLCM was implemented which extracted the best possible features out of the previous vector, into a 8 × 8 matrix. Thus, image is processed in to a 2D vector and feature extracted from the combination of both SURF and GLCM methods ensures the quality of the training dataset by not just extracting features faster (with SURF) but also extracting the best of the point of interests (with GLCM). The extracted featured related to the pattern are used in the neural network for training and testing. Pattern recognition algorithm has been used as a machine learning tool for the training and testing of the model. In the experimental evaluation, the performance of proposed model is examined by cross entropy for each instance and percentage error. For the tested drone dataset, experimental results demonstrate improved performance over the state-of-art models by exhibiting less cross entropy and percentage error. Manuscript profile -
Open Access Article
13 - Farsi Font Detection using the Adaptive RKEM-SURF Algorithm
Zahra Hossein-Nejad Hamed Agahi Azar MahmoodzadehFarsi font detection is considered as the first stage in the Farsi optical character recognition (FOCR) of scanned printed texts. To this aim, this paper proposes an improved version of the speeded-up robust features (SURF) algorithm, as the feature detector in the font MoreFarsi font detection is considered as the first stage in the Farsi optical character recognition (FOCR) of scanned printed texts. To this aim, this paper proposes an improved version of the speeded-up robust features (SURF) algorithm, as the feature detector in the font recognition process. The SURF algorithm suffers from creation of several redundant features during the detection phase. Thus, the presented version employs the redundant keypoint elimination method (RKEM) to enhance the matching performance of the SURF by reducing unnecessary keypoints. Although the performance of the RKEM is acceptable in this task, it exploits a fixed experimental threshold value which has a detrimental impact on the results. In this paper, an Adaptive RKEM is proposed for the SURF algorithm which considers image type and distortion, when adjusting the threshold value. Then, this improved version is applied to recognize Farsi fonts in texts. To do this, the proposed Adaptive RKEM-SURF detects the keypoints and then SURF is used as the descriptor for the features. Finally, the matching process is done using the nearest neighbor distance ratio. The proposed approach is compared with recently published algorithms for FOCR to confirm its superiority. This method has the capability to be generalized to other languages such as Arabic and English. Manuscript profile -
Open Access Article
14 - Relation of academic hope and approach to learning: Investigating the mediating role of academic self-regulation
samira rahpeima Dr Barani farhad khormaeiIntroduction: Hope as a perspective in positive psychology has attracted the attention of education specialist in the recent years. The aim of this study was to investigate the mediating role of academic self-regulation in the relation of academic hope and components of MoreIntroduction: Hope as a perspective in positive psychology has attracted the attention of education specialist in the recent years. The aim of this study was to investigate the mediating role of academic self-regulation in the relation of academic hope and components of approaches to learning. Method: Participants were 348 (223 girls and 125 boys) high school students which were selected using the random cluster sampling method. In order to investigate the variables of research self- regulation questionnaire, academic hope and learning approach scale were used. For analyzing the research model, structural equation model and Amos 22 software was used. Results: Results showed that academic hope predicted approach to learning directly and also indirectly through academic self- regulation. Conclusion: Conclusively, results of this study showed the importance of academic hope and self-regulation in the approaches to learning. Manuscript profile -
Open Access Article
15 - Relation of academic hope and approach to learning: Investigating the mediating role of academic self-regulation
Samira Rahpeima Dr Barani Farhad KhormaeeThe aim of this study was to investigate the mediating role of academic self-regulation in the relationship between academic hope and components of approaches to learning. Participants were 348 high school students (223 girls and 125 boys) which were selected using the MoreThe aim of this study was to investigate the mediating role of academic self-regulation in the relationship between academic hope and components of approaches to learning. Participants were 348 high school students (223 girls and 125 boys) which were selected using the random cluster sampling method during 2014-2015 academic years. In order to investigate the variables of research, Self-Regulation Questionnaire (Bouffard et al., 1995), Academic Hope and Learning Approach (Elliot et al., 1999) scale were used. For analyzing the research model, structural equation model and Amos 22 software were used. Results showed that academic hope predicted approach to learning directly and also indirectly through academic self- regulation. In sum, the results of this study indicate the importance and role of academic hope in increasing academic self-regulation and adaptive approaches. Due to the adaptive role of academic hope, educators need to pay special attention to teach these capabilities to students. Also, an increase in the negative attitude toward education and a decrease in the positive expectation of education society today will also increase the need for education and training of capabilities such as hope. Manuscript profile -
Open Access Article
16 - Exploring Content of Nurses’ Emotional Labour Dimensions and Investigating the Impact of Human Resource Management Practices on it in Mashhad’s Public Hospitals
Mostafa Kazemi saeed mortazaviEmotional labor as the management of emotions is the vital aspect of nursing profession that must be observed in order to express the organization’s intended emotions. Despite the emphasis made over the importance of this topic, it has not been much within the spot ligh MoreEmotional labor as the management of emotions is the vital aspect of nursing profession that must be observed in order to express the organization’s intended emotions. Despite the emphasis made over the importance of this topic, it has not been much within the spot light of experts inside the country; as the result there is no accurate cognition over the phenomenon. The current study, due to the existing knowledge gap and its important application in the domain being studied, explores contents of emotional labor dimensions in nurses; since a special goal out of HRM practices must be developed to create and preserve desired organization’s emotions, the second aim for this paper is studying the impact of HRM practices on contents of these dimensions. In the qualitative, all exemplar nurses of Mashhad’s public hospitals were interviewed by purposeful sampling; and the analysis was conducted through Colaizzi method. In quantitative, a questionnaire was distributed among 130 experienced nurses; and the analysis was conducted through confirmatory factor analysis (CFA) and AMOS software. Finally, in qualitative, in surface acting, 5 subcategories in 2 categories “emotional mask and emotional deal”; and in deep acting, 15 subcategories in 5 categories “emotional withdrawal, emotional empathy, emotional arousal, emotional sharing, and emotional reflection” emerged. In quantitative, the result for confirmatory factor analysis confirmed all categories and subcategories obtained in nurses’ emotional labor; also, HRM practices affected contents of emotional labor dimensions. Manuscript profile -
Open Access Article
17 - Design of Proportional-Integral Sliding Mode Controllers for Hyperchaotic Systems in the Presence of Uncertainty, Disturbance and Nonlinear Control Inputs
A. Abooee M. R. Jahed Motlagh Z. RahmaniIn this paper, robust controllers for a new hyperchaotic system are investigated in the presence of uncertainty, disturbance and nonlinear control inputs. The controllers are designed by considering two major goals: first to stabilize the hyperchaotic system in the pres MoreIn this paper, robust controllers for a new hyperchaotic system are investigated in the presence of uncertainty, disturbance and nonlinear control inputs. The controllers are designed by considering two major goals: first to stabilize the hyperchaotic system in the presence of uncertainties, disturbance and nonlinear control inputs; and second, to guarantee the prescribed disturbance attenuation, considering the defined performance index for it. Sliding mode control by defining three proportional integral switching surfaces is used to reach mentioned goals. Numerical simulations are used to exhibit the feasibility and performance of the proposed method. Manuscript profile -
Open Access Article
18 - Designing an Optimal Proportional-Integral Sliding Surface for a Quarter Car Active Suspension System with Suspension Components Possessing Uncertain Constants and Nonlinear Characteristics
S. A. Zahiripour A. A. JalaliIn this paper, design of a controller for a quarter car active suspension system have been done with the focus on sliding mode strategy. Suspension components, including spring and shock-absorber have nonlinear characteristics with uncertain constants, but they have def MoreIn this paper, design of a controller for a quarter car active suspension system have been done with the focus on sliding mode strategy. Suspension components, including spring and shock-absorber have nonlinear characteristics with uncertain constants, but they have defined bound. To simplify the controller designing, feedback-linearization is proposed, then with using the optimal strategy, we obtain a proportional - integral sliding surface and a controller for meeting the sliding condition has been proposed. The design process is in a such way that not only, guarantees asymptotic stability of the suspension system in the presence of parametric uncertainties, but also the designer can supply his slightly trade-off between convenience of passengers and controllability of car, with setting some parameters. Manuscript profile -
Open Access Article
19 - Designing an Adaptive Sliding-Mode Controller for Car Active Suspension System Using an Optimal logarithmic Sliding Surface
S. A. Zahiripour R. Tafaghodi A. A. Jalali S. K. Mousavi MashhadiIn this paper, a quarter car active suspension system with a hydraulic actuator, has been controlled by sliding mode coupled with an adaptive approach. To deal with all kinds of uncertainty arising from the effect of external perturbation or the any nonlinear behavior s MoreIn this paper, a quarter car active suspension system with a hydraulic actuator, has been controlled by sliding mode coupled with an adaptive approach. To deal with all kinds of uncertainty arising from the effect of external perturbation or the any nonlinear behavior system, sliding mode control has been used. In the proposed method the sliding surface, by using an optimal strategy to minimize the optimal cost function is derived, so the result is a logarithmic sliding surface. Adaptive algorithms proposed in this paper because of the nonlinear variability by time and not bounded uncertainty in the system. While the effects of parameter uncertainties and external disturbances to system performance have been dramatically reduced, the stability of control system proves based on the Lyapanof theory. The proposed control method has been done on a quarter car active suspension system with a hydraulic actuator. Simulation results of the proposed method show that the activation of suspension system by the proposed method increases its performance compare with the passive suspension system. Manuscript profile -
Open Access Article
20 - Analytical Stator Design for Reducing the Cogging Torque in Surface-Mounted PM Motors
M. R. Alizadeh Pahlavani V. Zamani FaradonbeWe present an analytical method for the calculation of cogging torque in surface permanent-magnet (PM) motors. The cogging torque is calculated by integrating the Maxwell stress tensor inside the air gap. The stator design techniques are applied to reduce the cogging to MoreWe present an analytical method for the calculation of cogging torque in surface permanent-magnet (PM) motors. The cogging torque is calculated by integrating the Maxwell stress tensor inside the air gap. The stator design techniques are applied to reduce the cogging torque in SPM motors. The used techniques are stator dummy slots, teeth pairing and stator slot skewing. The direct search method is used to find the optimum geometry in the mentioned methods. Finally, the validity of the proposed model and the obtained results are verified with Finite Element Analysis. Manuscript profile -
Open Access Article
21 - Laboratory study of alteration in reservoir rock wettability for the prevention of asphaltene sediment formation using metal oxide Nano-particles
abdolhamid ansari Sadegh AmeriOne of the methods of harvesting oil reservoirs is the injection of nanoparticles. Nanoparticles increase oil recovery from reservoirs by changing wettability, reducing surface tension, reducing oil viscosity. Metallic nanoparticles (ceramic nanoparticles) have the high MoreOne of the methods of harvesting oil reservoirs is the injection of nanoparticles. Nanoparticles increase oil recovery from reservoirs by changing wettability, reducing surface tension, reducing oil viscosity. Metallic nanoparticles (ceramic nanoparticles) have the highest application in increasing the absorption of reservoirs. In this research, changes in the contact levels of oil, water, and stone in the presence and absence of metal oxide nanoparticles have been investigated. The change in the rock's wettability has been analyzed in various concentrations of nanoparticles in the aqueous phase and the governing mechanism for changing the rock solidity in two metal oxide nanoparticles is presented. 4 nanoparticles used in this study are TiO2, NiO, Co3O4, Al2O3 The specimens were then measured by the DSA and the angles were measured and it was observed that the maximum gradient of the graph is related to nickel oxide followed by cobalt oxide and then titanium oxide and the lowest slope to aluminum oxide. In this respect, from this point of view, Nano particles are considered as NiO> Co3O4> TiO2> Al2O3, respectively. So the first suggestion is to select the most suitable nanoparticles of metal oxide, NiO, and for the second position Co3O4, the third and fourth choices are TiO and Al2O3, respectively. Manuscript profile -
Open Access Article
22 - Polyoxymetal / polymer composites An overview of synthesis methods and their properties
Marziyeh Kavian Milad Ghani Jahan Bakhsh RaoofThis article gives an overview of the manufacturing method and properties of composites containing polyoxymetals / polymers. Polyoxometals (POMs) are discrete, molecular, metal oxide clusters of various sizes ranging from one to several nanometers that exhibit different MoreThis article gives an overview of the manufacturing method and properties of composites containing polyoxymetals / polymers. Polyoxometals (POMs) are discrete, molecular, metal oxide clusters of various sizes ranging from one to several nanometers that exhibit different topologies and diverse chemical and electronic properties. POMs show very strong acidity, which makes them effective acid catalysts for specific reactions such as esterification, hydrolysis, Friedel-Craft alkylation, and tetrahydrofuran ring-opening polymerization. The integration of mineral components with polymer matrices will combine the properties of the mineral phase with polymers and create new functions. Mineral micrometer building blocks have been used to enhance mechanical strength, improve thermal and chemical stability, and improve the performance of polymeric materials. With the rapid development of nanotechnology, polymers can also be used as a substrate for the stabilization of nanostructures, which will eventually have the properties of nanostructures and polymer substrates at the same time. Methods such as physical composition, electrostatic adsorption, covalent bonding, and supermolecular modification are the main methods for combining POM in organic or inorganic polymer matrices (eg silica). Polyoxymetal / polymer composites have various properties such as unique optical, electrical or catalytic properties of polyoxymetals and the optimal processing and stability of polymer matrices. POM/ polymer composites may have many applications in optics, electronics, biology, medicine and catalysis Manuscript profile -
Open Access Article
23 - Investigation of structural pattern and introduction of detachment surface of Alborz Mountain Range in the north of Damghan
Z. Taslimi A. Saidi M. Ghoreshi M. Aryan A. SolgiThe studied area is a part of Eastern central Alborz, bestween southeastern piedmont of Alborz (NW of Damghan) and North Alborz Fault (South of Sari). The Alborz Mountain range which forms the heights of northern territory, separated the Caspian Depression from Iran cen MoreThe studied area is a part of Eastern central Alborz, bestween southeastern piedmont of Alborz (NW of Damghan) and North Alborz Fault (South of Sari). The Alborz Mountain range which forms the heights of northern territory, separated the Caspian Depression from Iran central plateau. The Alborz is one of the Iranian mountain ranges that were deformed during two Cimmerian and Alpine organic events. This deformation is continued until the present day. This research is based on the satellite images, field investigations, drawing structural sections, stratigraphic sequences from the folded and thrusted parts of Alborz Mountains. The studied area is composed of numerous anticlines and synclines from South to North as Tuyeh- Darvar anticline, Sabour anticline, Talma- Darreh anticline, Alikhani syncline, Tarkan anticline, Babr cheshmeh syncline and anticline. Some of these folds are related to faulting which occured due to the typical continuous shortening and faulting of Alborz crust and destroyed their original patterns. The function of main faults and specially thrust faults played an essential role on the present models of mentioned folds. Regarding the axes of the folds, the effective compression over the area has a North, North Waste-South, South-East direction. This direction is perpendicular to axial trend of folds. The physico-mechanical properties of Alborz geological units caused development of detachment surfaces on main faults. The shortening intensity and large displacements have led to disappearance of a limb or whole fold. In this study the three surfaces of detachment were introduced inside the stratigraphic sequences from Precambrian to middle Eocene based on the well-known and documented data. Manuscript profile -
Open Access Article
24 - Investigation of Blood Coagulation Process on Biopolymers and Review on the Hemocompatibility Evaluation Methods
Rahim Dehghan Jalal Barzin Seyed Hossein Abtahian Behnam Darabi Hamidreza GhaderiThe use of biopolymers in the development of biomedical devices has extended in recent years. These devices are including prosthetic heart valves catheter, cardiovascular stents, artificial arteries, peacemakers, hemodialysis membranes, etc. Hemocompatibility is taken i MoreThe use of biopolymers in the development of biomedical devices has extended in recent years. These devices are including prosthetic heart valves catheter, cardiovascular stents, artificial arteries, peacemakers, hemodialysis membranes, etc. Hemocompatibility is taken into account as one of the essential cases of biopolymers for biomedical applications. Knowing biopolymer-blood interaction is very considerable for the development of a hemocompatible biopolymer. Various factors can undergo the hemocompatibility of biopolymers. Surface properties such as hydrophilicity, surface energy, and electrostatic charge are the most important factor for the control of hemocompatibility. In this study, further blood coagulation mechanism on the biopolymers, evaluation methods of hemocompatibility is investigated. Methods include protein adsorption which is the first phenomenon of the blood coagulation process, investigation of kallikrein activity which evaluates intrinsic coagulation pathway, assessment of coagulation times such as thrombin time (TT), prothrombin time (PT) and activated partial thromboplastin time (APTT) which monitor extrinsic, intrinsic and common pathway of blood coagulation, hemolysis of erythrocytes, microscopy analysis of cell adhesion, platelet adhesion and activation. Change in platelet morphology is one of the main criteria for the investigation of blood compatibility. Finally, a hemocompatible polymer should pass all mentioned blood compatibility analyses. Herein, besides i Manuscript profile
Rimag
Rimag is an integrated platform to accomplish all scientific journal requirements such as submission, evaluation, reviewing, editing, DOI assignment and publishing in the web.
Links
Related Centers
Technical Support
Official pages
The rights to this website are owned by the Raimag Press Management System.
Copyright © 2017-2024