فهرست مطالب m.ramezani

It is well known that ammonia nitrogen is a major pollutant in aquaculture, which can have toxic effects on fish. When absorbed in toxic concentrations, ammonia nitrogen can enter the bloodstream of fish, affecting blood parameters, immune responses, and causing oxidative damage and neurotoxicity. Recently, a study was conducted to investigate the toxic effects of ammonia on the blood, liver, growth, tissue damage, and immune indices of Cyprinus rubrofuscus in the presence of formaldehyde bisulfite sodium (FBS). The study involved 360 C. rubrofuscus, which were randomly distributed among 24 aquaria with a ratio of FBS to ammonia set at 31mg/L:1mg/L. The experiment was conducted with 15 fish in 6 treatments and 4 repetitions until 50% mortality was observed. The growth, histology, hematology, immunity, liver enzymatic and biochemical features of the fish were studied, and the results were analyzed using one-way analysis of variance (One-Way ANOVA) and Duncan’s test. The study found that the blood, immune, and liver indices of koi fish changed in the presence of FBS. Additionally, adding FBS to aquarium water reduced nitrogen compounds in fish storage tanks, further reducing the nitrogen compounds in fish aquaria.

With the growing movement of using direct current (DC) load demands, as well as DC distribution generations (DGs), the distribution system has undergone significant changes on the production and demand side. Due to alternating current (AC) and DC generators and load demands, it is not cost-effective to continue in the AC distribution system. Therefore, AC/DC hybrid distribution system planning is economical despite various demands and generations. On the other hand, uncertainty in load demand and output power of DGs cause the possible behavior of the distribution system. This behavior leads to risk in the distribution system. In this paper, the AC/DC distribution system planning is discussed by considering the risk. The planning problem in the matrix laboratory and general algebraic modeling system (MATLAB/GAMS) hybrid space has been formulated and solved. Using the K-means algorithm, the uncertainty related to renewable DG output power and load demand has been modeled. To verify the proposed method, it was implemented in a sample distribution system.

The Osteoblast differentiation is an essential process that causes bone stability and homeostasis. Zingerone (ZG) 4-(4-hydroxy-3-methoxyphenyl)-2-butanone isolated from the ginger plant is involved in many biological processes and can be used to treat diseases as an anti-inflammatory and antidiabetic agent. This study aims to identify ZG potential to bone tissue regeneration by investigating the effect of Zingerone on human umbilical cord stem cells (hUC-MSCs) and their differentiation into osteoblasts.

In this cross-sectional study, the effect of Zingerone toxicity on 2×106 hUC-MSCs cells was investigated in 4 groups; one control group without any ZG and 3 groups threated with 50µM, 100µM and 200µM ZG. Cell viability was evaluated by the MTT method after 24, 48 and 72 hours. The gene expression of miR-590 and Smad7 and differentiation markers such as Osterix (OSX) and runt-related transcription factor 2 (RUNX2) were investigated by quantitative real-time polymerase chain reaction (qRT-PCR). The expression level of this enzyme was checked by an alkaline phosphatase (ALP) reaction.

Zingerone has significant proliferative effects on hUC-MSCs cells in 200µM (p<0.05). Zingerone positively affects the differentiation process of osteoblasts by influencing the expression of specific markers such as ALP (p<0.05 in 200µM), RUNX2 (p<0.001 in 200µM), and OSX (p<0.001). The expression of miR-590 is increased in 200µM (p<0.05), while that of Smad7 is decreased under the influence of different Zingerone concentrations (p<0.001). In fact, miR-590 suppresses Smad7 and helps the differentiation of osteoblast cells.

The results of this study showed that Zingron causes the differentiation of osteoblast cells by increasing the expression of specific markers of osteoblasts (OSX, RUNX2 and ALP). In addition, increasing the expression of miR-590 suppresses Smad7 and helps the differentiation of osteoblast cells.

In recent years, there has been a lot of interest in the development and deployment of control methods that use different components of the building to mitigate the seismic response of the structure. Meanwhile, the building facade, as a non-structural component, can be a suitable alternative in affecting the structure's behavior because of its role as an envelope of the building with a significant weight. Among the modular cladding systems, the Double Skin Facade (DSF) can be considered a passive system due to the distance of the exterior layer from the main structure and sufficient continuity and rigidity.  In this study, DSF systems are used as Peripheral Mass Dampers (PMDs) that control structural movements by dissipating energy during strong motions. The PMD system provides a building with several inherent dampers without the need for extra mass. To show the reliability and efficiency of the proposed approach, the PMD model is investigated and compared with results available in uncontrolled and Tuned Mass Damper (TMD) models. The PMD model is examined in three structural frames with 10, 20, and 30 stories with the extreme Mass Ratios (MRs) of 5% to 20%. The Particle Swarm Optimization (PSO) is performed on damper parameters of PMD and TMD systems to minimize structural responses. The results demonstrate that an optimal PMD system with multiple inherent mass dampers outperforms a single TMD system.

Sleep disorders are common psychological disorders that disturb physical and mental health and quality of life. Sleep disturbances are syndromes characterized by impairment in the amount of sleep, sleep quality, sleep time, or disorder in the behavioral or physiological conditions that occur during sleep. Sleep disorder is a common childhood complaint and the fifth cause of referrals to pediatricians. Although Sleep disorder is considered one of the common disorders in childhood, it has not been primarily investigated.

Individuals follow a unique behavioral habit to sleep, but what is certain is that sleeping habits tremendously affect the sleep process. Inappropriate health habits and specific sleep problems result from physical, mental, environmental, or inherited conditions that reduce good sleep and endanger the individual's health. Sleep habits affect the quality of sleep during childhood. Improper sleep habits are hazardous for health and well-being, even in adulthood and after that. Perhaps, with much more community-based and clinical research, it is possible to identify and correct sleep problems and habits in children. So, those children can be brought to a higher level of physical-psychosocial health. On the other hand, early identification and suitable intervention of children with backgrounds of sleep problems provided them with better results.

 The present study investigates the kinetic and thermodynamic parameters in removing one of the essential phenolic derivatives (2-chlorophenol) by zinc oxide nanocatalysts synthesized by the green method, during photocatalytic and sonocatalytic progress.

 The present study is an experimental study conducted in the research laboratory of the Department of Chemistry of Ardabil Islamic Azad University. In order to evaluate the efficiency of the photocatalytic and ultrasonic process in the removal of 2-chlorophenol, the first nanocatalyst was prepared by the green method using a paper flower species called Bougainvillea spectabilis. After ensuring the synthesis accuracy with the help of various technologies, essential parameters affecting the removal efficiency of 2-chlorophenol, such as concentration, amount of nanocatalyst, solution pH, and temperature, were investigated, and the most suitable conditions for removal during photocatalytic and ultrasonic processes were identified.

 The XRD spectrum confirms the synthesis of zinc oxide nanocrystals. The uniform hexagonal nature of ZnO nanoparticles with a size between 12 and 31 nm was confirmed using SEM and TEM images. Elemental analysis (EDX) showed that the synthesized pure nanoparticles contained 74.94 wt. % of zinc and 25.06 wt. % of oxygen. Examination of 2-chlorophenol removal from aqueous solution in dark conditions showed that the Langmuir and Freundlich isotherm models best follow the removal process. Investigation of the removal kinetics of the studied phenolic derivative with high line regression coefficient introduced pseudo-second-order kinetics for the removal process of 2-chlorophenol.

 According to the thermodynamic parameters obtained in this study, the negative values of Gibbs free energy changes (ΔG°) at all temperatures studied during the photocatalytic and sonocatalytic removal process showed that the removal reaction is spontaneous. Also, the positive enthalpy changes (ΔH°) during the removal process by the nanoparticles synthesized from the paper flower indicated that the removal process is endothermic. Our research showed that the synthesized nanoparticles could be used for photocatalytic and sonocatalytic removal of 2-chlorophenol from the aqueous medium with an efficiency of 90.21 and 82.54%, respectively.

The realization of Islamic civilization based on religion, rationality, science and ethics is the goal of the Islamic Revolution. Culture-oriented knowledge and technology-oriented knowledge is a factor for reproducing the original Iranian culture with a leap in production, which is achieved with the approach of a civilization-building university. The present study is conducted to identify the antecedents of the Civilization University.

The paradigm of the present study was interpretive with a qualitative approach. Research data were collected through semi-structured interviews. The study participants included 12 academic experts familiar with the concept of a civilization-building university. For this purpose, by reviewing the documents and purposeful sampling, the interviews with the experts continued until the theoretical saturation was reached. Content analysis method was used to analyze the data.

Dimensions related to the antecedents of this approach include: 1. Utilization of knowledge by society; 2. Combining the function of the university with civilization; 3. Paying attention to the production of science in accordance with the needs of society; 4. Use of communication and information technology; 5. The formation of the pillars of civilization;6. How to manage the university; 7. Value and spirituality; 8. Curricula are world-class and civilization-building.

The authors of the survey conclude that by providing the necessary basis for the civilization of the university based on the identified indicators, universities are on the path of civilization.

Since the introduction of the finite element approach, as a numerical solution scheme for structural and solid mechanics applications, various for mulation methodologies have been proposed. These ways offer different advantages and shortcomings. Among these techniques, the standard displacement-based approach has attracted more interest due to its straightforward scheme and generality. Investigators have proved that the other strategies, such as the force-based, hybrid, assumed stress, and as sumed strain provides special advantages in comparison with the classicfinite elements. For instance, the mentioned techniques are able to solve difficulties, like shear locking, shear parasitic error, mesh sensitivity, poor convergence, and rotational dependency. The main goal of this two-part study is to present a brief yet clear portrait of the basics and advantages of the direct strain-based method for development of high-performance plane finite elements. In this article, which is the first part of this study, assump tions and the basics of this method are introduced. Then, a detailed review of all the existing strain-based membrane elements is presented. Although the strain formulation is applicable for different types of structures, most of the existing elements pertain to the plane structures. The second part of this study deals with the application and performance of the reviewed elements in the analysis of plane stress/strain problems.

In this part of the study, several benchmark problems are solved to evalu ate the performance of the existing strain-based membrane elements, which were reviewed in the first part. This numerical evaluation provides a basis for comparison between these elements. Detailed discussions are offered after each benchmark problem. Based on the attained results, it is con cluded that inclusion of drilling degrees of freedom and also utilization of higher-order assumed strain field result in higher accuracy of the elements. Moreover, it is evident that imposing the optimal criteria such as equilib rium and compatibility on the assumed strain field, in addition to reducing the number of degrees of freedom of the element, increases the convergence speed of the resulting strain-based finite elements.

The presence of uncertain parameters in the power system has created many challenges for designers andoperators of the system including the problem of capacitors in the presence of wind power plants. The answer depends on the amount of load and output power of the wind power plant that has uncertain values. In this paper, the information gap based decision theory method is used model the uncertainty in load and output power of the wind power plant. The objective function includes the cost of capacitive banks and energy losses, used to of load Flow based on unscented transformation for calculate energy losses. A genetic algorithm is used to optimize the above problem. Finally, the efficiency of the proposed method has been investigated by carrying out numerical studies on the IEEE 33-bus network.

In this paper, a robust method is proposed to detect damage extent and location of structural elements focusing on data type and acquisition method and aiming to the promotion of model updating tools. The novelty of this method is rotational mode shape acquisition, which provides valuable information on the damage. In this method, the damaged elements are indirectly identified by detecting the healthy elements and eliminating them from searching space. This method requires to minimize the modal strain energy difference between the damaged model and numerical model via an optimization algorithm, then an improved genetic algorithm (IGA) is used. In this study, four numerical and two experimental damage scenarios are applied on a simply supported beam to examine the performance of the proposed method. Modal data acquisitions have been made by vision-based method and accelerometer sensors. The results demonstrate that this method could accurately figure out the location and severity of damage using just the first mode shape since rotational mode shapes are more sensitive than vertical mode shapes in damage detection.

The aim of the study was to investigate the effect of temperature, time, pH, capping agent concentration (mercaptoacetic acid), Zn to Se and Se to reducing agent (NaBH4) mole ratios on morphology, phase developments and size of zinc selenide nanoparticles prepared by hydrothermal method. Characterization of zinc selenide nanoparticles was performed by Field Emission Electron Microscopy (FESEM), Energy Dispersive X-ray Spectrometry (EDS), X-ray Diffraction (XRD), Induced Coupled Plasma Spectrometry (ICP), Fourier Transform Infrared spectroscopy (FTIR) and Simultaneous Thermal Analysis (STA). The results of EDS showed that the ratio of atomic percentage of Zn to Se in the optimized zinc selenide nanoparticles is 1: 1 and elements are evenly distributed in the nanoparticles. Based on the results of FTIR and STA thermal analyses, MAA as the stabilizing agent binds to and stabilizes zinc selenide nanoparticles. Finally, fine nanoparticles of zinc selenide with narrow size distribution, spherical shape and cubic crystal structure were obtained at the minimum temperature (130 °C) and processing time (15 hours) with the least amount of reducing and capping agents compared to previous researches.

Spillways are used in dam projects to convey flood flows and prevent destructive damages of downstream hydraulic systems, while the construction of other types of spillways is restricted, or there is a need to pass great values of flood discharge with a limited head. Siphon spillway is a kind of dam spillways employed in a number of dam reservoirs. This spillway is applied while the space for constructing other types of spillways is restricted, or when there is a need to pass great values of flood discharge with a limited head. One of the most important defects of this spillway is a complicated fluid-structure interaction due to the establishment of different flow regimes inside the spillway. This situation becomes more complicated when the spillway is not connected to the dam, working individually. Despite the importance of the operation of these hydraulic structures, there is a lack of comprehensive research to investigate the hydraulic behavior of these structures and the flow field around and inside them. In the present study, different unsteady flow regimes including sub-atmospheric flow, two-phase flow, and black-water flow and their effects on the hydraulic characteristics of siphon spillways were investigated. For this purpose, ANSYS CFX software was applied to simulate the flow field in such spillways. To validate the obtained flow regimes, via numerical modeling, experimental results of the former studies were used. Results indicated that the pressure fluctuations were mostly greater beneath the inlet and throat of the spillway compared to the other sections.

The aerodynamic of Vertical Axis Wind Turbine (VAWT) is more complex than a horizontal axis wind turbine. In the present research, the combination of the Wagner unsteady aerodynamic model, static stall and Double Multiple Stream Tube (DMST) aerodynamic model have been used to investigate the aeroelastic behavior of VAWT. For this purpose, the DMST aerodynamic model, which is related to the vertical axis wind turbine aerodynamics model, has been used to obtain two parameters of the angle of attack and relative velocity. Then these two parameters have been applied to the Wagner nonlinear aerodynamics, which considers the effect of the static stall. This flexible nonlinear presented model based on DMST is called NFDMST aerodynamic model. One-degree of freedom of typical section and two-degree of freedom model have been investigated for static aeroelasticity and dynamic aeroelastic behavior, respectively. The VAWT blade experiences a variety of attack angles and relative velocity in a spin, so the goal is to obtain the instability velocity in a different position and consider the effect of aerodynamic and structure nonlinearity. The results show that the nonlinear aerodynamic model has accurate results and the aeroelastic design condition associated with -90degree azimuth angle, in which the minimum instability velocity is 45.2m/s. In addition, the change of instability speed of rotating airfoil in a spin is about 6%.

This article investigated trade-off between human and natural resources emphasizing on education. Some studies have argued that resource-rich countries are exposed to relying on natural resources and neglecting human resources. So that emphasizing on education as a tool of investing in human resources was declined. Ratio of the share of resources rent to the share of taxes was introduced as representative of political economy of natural resources. This variable controlled effects of changing the natural resources rent management. International tests scores (TIMSS, PIRLS and PISA) were considered as education quality measure. A panel data model with fixed effects approach was applied as econometric method at the estimating of education production function‘s parameters. The findings revealed that effects of political economy of natural resources were significant and then education quality diminished while share of natural resources rent at the government revenues increased. In most cases estimated coefficients for the variable of the share of resources rent to the share of taxes’ ratio were robust and negative effect of reducing the dependence of the economy on resources rent on the quality of education was confirmed.

The myth is a scared narrative and dream is an unconscious natural phenomenon that appears in conscious. Myth and dream connected to each other ; both benefiting from a symbolic language and needed explanations. The aim of this paper was to review Jrireh and Katayun dreams in the Ferdowsi Shahnameh based on Jung theory. It was concluded that dreams were considered the inclusion of archetypal image of collective unconscious and had significance role in the development of Shahnameh stories. Jrireh dream was a huge dream regarding its own collective mythological essence consequented by death for the inhabitants of Kalat desert. But big dream of Katayun promised celebration and festival that would occur with the union (marriage) of Katayoun and Goshtasp.

This study was conducted to determine the application of biofertilizers, instead of chemical fertilizer, for optimal cowpea nutrition. It was performed in a factorial experiment based on Randomized Complete Block Design with three replications at Agricultural Research Center of West Azarbaijan, Iran during growing season of 2008-2009. Experimental treatments consisted of 4 rates of biofertilizers (without fertilizer , Yashil chemical fertilizer, Nitragine biofertilizer, Yashil㘫歪ࢧ) as factor A and 4 rates of nitrogenous chemical fertilizer( 0, 26.25, 52.5 and 75 kg/ha urea) as factor B. Analysis of the results showed that there were significant differences between rates of factor A (Nitragin biofertilizers Yashil chemical fertilizer) and rates of chemical fertilizers and interaction between different levels of factor(A and B) for grain yield, number of grain per pod, number of grain per plant, number of pod per plant, 1000- grain weight and harvest index at 5% level of probability. It was also revealed that the effect of Yashil㘫歪ࢧ treatment was highly positive. The results showed that application 52.5 kg/ha urea highly increased on traits. The results obtained from interaction of different levels of factor AÍB indicated that application of 52.5 kg/ha urea and Yashil Nitragin combination had the highest effects on all traits. With regard to this results, it can be said that application of biofertilizers with chemical fertilizers had maximum increase in all traits under study.

In this paper, we introduce the cone normed spaces and cone bounded linear mappings. Among other things, we prove the Baire category theorem and the Banach--Steinhaus theorem in cone normed spaces.

The general goal of this research was to study the effective factors on the success of the poultry-farm cooperatives in Isfahan province. Based on multi-stage cluster sampling and Chocran formulas, nine cooperatives and 173 members were selected from 15 cooperatives with 1768 members. After completion of questionnaires, the AHP method was employed for scaling. Statistical tests (factor analysis and alpha coefficient) indicated that this research has a high construction validity and reliability. The research results indicated that cooperative functions toward fulfillment of members' demands were weak. The results of the path model indicated that effective factors on the success of cooperatives (from highest to the lowest) are: knowledge of cooperative principles by the members, extra-organizational factors, education quality, managers' skills, participation in cooperative affairs, and members' education level. Also, the success of cooperatives much relies on inter-organizational factors. The amount of members' share from education, participation in cooperative's affairs, the managers' specialty and skills, and knowledge of cooperatives' principles are very weak. Research results indicated that there is a direct and statistically significant correlation between these independent variables and the success of cooperatives in Isfahan province.

The general goal of this research was to study the effective factors on the success of the poultry-farm cooperatives in Isfahan province. Based on multi-stage cluster sampling and Chocran formulas, nine cooperatives and 173 members were selected from 15 cooperatives with 1768 members. After completion of questionnaires, the AHP method was employed for scaling. Statistical tests (factor analysis and alpha coefficient) indicated that this research has a high construction validity and reliability. The research results indicated that cooperative functions toward fulfillment of members' demands were weak. The results of the path model indicated that effective factors on the success of cooperatives (from highest to the lowest) are: knowledge of cooperative principles by the members, extra-organizational factors, education quality, managers' skills, participation in cooperative affairs, and members' education level. Also, the success of cooperatives much relies on inter-organizational factors. The amount of members' share from education, participation in cooperative's affairs, the managers' specialty and skills, and knowledge of cooperatives' principles are very weak. Research results indicated that there is a direct and statistically significant correlation between these independent variables and the success of cooperatives in Isfahan province.

The distinction between follicular adenoma and follicular carcinoma of the thyroid can be particularly challenging in routine practice of diagnostic surgical pathology. Often examination of several histologic sections is required in order to identify the presence of unequivocal capsular and/ or vascular invasion.

To investigate the role of immunohistochemical markers in the differential diagnosis of follicular lesions of the thyroid, we studied the expression pattern of P53 and Ki-67 in 52 follicular adenomas and 52 follicular carcinomas of the thyroid. Thirty simple goiters were examined as a control.

Ten percent of simple goiters exhibited nuclear P53 expression. P53 positivity was seen in 55.8% and 82.7% of follicular adenomas and carcinomas respectively. Ki-67 nuclear immunoreactivity was observed in 30% of simple goiters, 51.9% of follicular adenomas and 96.2% of follicular carcinomas. Sensitivity and specificity of P53 in diagnosing follicular carcinoma in compaarison with follicular adenomas were 82.7% and 44.2% respectively. Similarly, the results for Ki-67 were 96.2% and 48.1% respectively. Using both P53 and Ki-67 markers had 82.7% sensitivity and 57.7% specificity which shows high sensitivity and a better specificity for diagnosis of follicular carcinoma (compared with follicular adenoma).

The results of this study indicate that immunohistochemical detection of P53 and Ki-67 may have practical application in the differential diagnosis of follicular carcinomas from follicular adenomas in routine surgical pathology (p<0.0005).