فهرست مطالب bahram ebrahimi

This study used thermochemical and Fe particle co-precipitation methods to prepare a magnetic-activated carbon composite. The hard nutshell of Baneh from the Oraman region of Kurdistan province was used as raw material. The structural properties of the prepared adsorbent were investigated using SEM, FT-IR, EDAX, BET, and VSM analysis methods. The SEM images clearly showed the formation of a porous adsorbent with porosity in the range of micro- and mesopores. The results of the FT-IR and EDAX analyses proved the presence of Fe in the absorbent structure. The specific surface area of the adsorbent before and after the deposition of iron particles was determined to be 229.6 and 179.37 m2/g, respectively. Under the optimized conditions, the removal amount of the investigated dyes from the model solutions was 91.2 and 98.6 % for acid blue 113 and acid orange 10, respectively. The kinetic study revealed that the pseudo-second-order model best fits the obtained adsorption data. In addition, the Freundlich model was the best model to describe the adsorption process.

Bio-remediation methods of organic pollutants are promising due to their high efficiency, low cost, and green chemistry. These methods are effective alternatives to traditional elimination methods. Bacillus cereus PTCC 1015S strain was used to eliminate acid blue 113 (AB113) and acid orange 7 (AO7) from aqueous solutions. The bacteria were activated in the Luria Bertani Broth (MILLER) culture medium. The effective parameters such as incubation time and temperature, pH of dye solution, dye concentration, and the bacterial inoculation quantity on decolorization were investigated. Kinetic and thermodynamic studies were done to clarify the different aspects of the introduced method. Also, the reliability of the method to remove studied dyes was investigated in dye factory wastewater samples. The first-order kinetic model was the best model to describe the kinetics of decolorization. The obtained thermodynamic data showed that the elimination process was endothermic (ΔH0 = + 29.03, 30.53) while it was spontaneous (ΔG0 < 0) for both studied dyes and so entropy change (ΔS0 = + 109.63, 116.32) was an effective force in the decolorization. Under optimized conditions, B. cereus PTCC 1015S showed high average removal; 98.5 and 99.3 % for AB113 and AO7 respectively in dye model solutions. The removal efficiency was more than 85 % for bothstudied dyes in wastewater spiked samples. The B. cereus PTCC 1015 strain was capable of being exploited in the removal of AB113 and AO7 dye molecules as an affordable and eco-amiable method for the treatment of aqueous samples contaminated with the studied azo dyes.

Sustainable development is one of the most important goals with which city managers tend to be faced. With the increasing need for public services in cities on the one hand and financial constraints on the other hand, the need to realize this goal is felt more and more. Furthermore, today, city tourism is one of the main pillars and economic stimulus of many cities that plays an important role in employment, income, protection of infrastructure, public services and sustainable urban development. Therefore, the purpose of this study is to develop a city branding model with the aim of sustainable development considering the variable of human resources. The research method in the present study is practical in terms of its nature and purpose, and descriptive and cross-sectional in terms type. The statistical population in this study in the stage of systematic review of the literature includes all the research available in domestic and foreign databases, and in the stage of Delphi panel section, it includes university professors and experts in the field of the research topic. The statistical population in the model test stage includes managers of all municipal departments and city council members in three cities: Amol, Babol, and Mahmudabad. The sampling strategy to determine the panel was informed by non-probability judgment and snowball sampling method, and in the model test stage, it was done through random cluster sampling method. The data collection tool is a questionnaire. In order to evaluate the validity of the questionnaire, content validity, factor analysis, convergent and discriminant validity were used. Cronbach's alpha value was more than 0.70. In order to develop the model, in the first step, the method of systematic review of the thematic research literature was used, after which the Delphi method was conducted. In the second step, the method of structural equation modeling was used to determine the appropriateness of the conceptual model. The findings showed that there were positive and significant relationships between the variables of the model and the claimed model had a good fit.

Investigate the impact of income is one of the most important challenges facing city managers, but on the other hand, with the increasing need for public services in cities and financial constraints, this challenge is increasing day by day. On the other hand, today, city tourism is one of the main pillars and economic stimulus of many cities that plays an important role in employment, income and protection of urban infrastructure and public services. Therefore, the purpose of this study is Investigate the impact of the role of city managers that as a human factor can affect the sustainable income of tourism by considering the mediating variable of city brand. The statistical population in this study included municipal managers at both senior and operational levels, members of the city council and officials of the heritage department related to the tourism sector in Cities in the central part of Mazandaran province. Sampling was done by cluster sampling method. Data collection tools are questionnaires.in order to evaluate the validity of the questionnaire, content validity, factor analysis, convergent and discriminant validity were used. Cronbach's alpha value was more than 0.70. To determine the degree of fit of the conceptual model, the structural equations modeling method has been used. Findings showed that there were positive and significant relationships between model variables and the role of city brand mediation was also confirmed and the claimed model has a good fit.

There is no official and representative information on certain health-risk behaviors in Iran. This national survey was performed to determine the prevalence of five high-risk behaviors among the adult population and underlying factors.

This cross-sectional study was performed in 23 provinces of Iran in 2019 involving 10,957 participants. The following five risky behaviors were evaluated: (a) using illicit drugs in the past month, (b) drinking alcohol in the past month, (c) having extramarital sex in the past year, (d) having suicidal thoughts in the past month, (e) and attempting suicide in the past year. The logistic regression model was used for analyses and associations were reported using odds ratio (OR) with its 95% confidence interval (CI).

The prevalence of health-risk behaviors was as follows: illicit drug use 10.4%, drinking alcohol 16.8%, extramarital sex 9.9%, suicidal thoughts 8.8%, and suicide attempt 5.4%. Almost 27.6% of the participants were involved in at least one risky behavior. There was a strong association between illicit drugs use and male gender 2.51 (2.11-2.98) and using psychiatric medications 2.96 (2.46-3.55); between drinking alcohol and male gender 2.23 (1.93-2.58); between extramarital sex and divorced/widowed status 2.43 (1.72-3.44) and having an intimate friend of the opposite sex 3.75 (3.13-4.51); between suicidal thoughts and using psychiatric medications 2.23 (1.83-2.72); between suicide attempt and a history of running away from home 2.10 (1.64-2.68).

More than one-fourth Iranian adult population is involved in at least one risky behavior. Engaging in any risky behavior may increase the possibility of engaging in other high-risk behaviors.

This survey was conducted to determine the level of aggression among the Iranian adult population and underlying predisposing factors. Study design: A cross-sectional study.

This cross-sectional study included 10,957 participants, involving 23 out of the 31 provinces of Iran in 2019. The outcome of interest was aggression, evaluated by the Buss & Perry aggression questionnaire. The association between aggression and 34 demographic, behavioral, social, and cultural characteristics was assessed using simple and multiple linear regression.

The overall mean (SD) score of aggression was 77.10 (22.53). Based on the severity of aggression, the participants were categorized into four groups as follows: 2,464 (23.1%) nonaggressive, 4,692 (43.9%) mild, 3,071 (28.8%) moderate, and 454 (4.2%) severe aggressive. Aggression was more likely to occur in people with the following characteristics: younger ages, having several siblings, lower ranks of birth, having an intimate friend of the opposite sex, having an aggressive father/mother, history of parental divorce, interest in watching action/porn movies, listening to music, history of escape from home/school, using neuropsychiatric drugs, using illicit drugs, history of suicidal thoughts/attempt, and family conflict and hostility. Aggression was less likely to occur with the following characteristics: reading, regular physical exercise, the ability to control anger, regular prayer, adherence to avoid lying, respect to other people's rights, sexual satisfaction, and attachment to parents.

A majority of the population has some degree of aggression. Aggression is a multifactorial behavior corresponding with several demographical, social, cultural, and religious factors, some of which back to early childhood events.

To date, no study with a proper sample size has been done to evaluate the efficiency of using pre-designed checklists in history taking of trauma patients in Iran. Therefore, the present study was designed to evaluate the pre-designed checklist’s effects on the quality of history taking in trauma patients referred to the emergency department (ED).
In the present prospective cross-sectional study, data of the trauma patients presented to the ED were recorded either with or without using a checklist, randomly. The designed checklist consisted of personal data, trauma mechanism, wound characteristics and trauma severity, severity and location of injuries, and the patient’s diagnostic and therapeutic plans. The quality of data gathering in each evaluated item was divided into 3 groups of complete recording, incomplete recording, and not recorded. Data recording quality was compared between the 2 groups using chi square or exact Fisher’s test. In all analyses, p In the preset study, patient data were gathered without using a checklist in 795 and using a checklist in 384 cases. Complete and accurate data recording in all items was more frequent in the group that had used the checklist (p It seems that using pre-designed checklists for history taking in trauma patients, leads to a significant increase in quality of data recording and history taking.

There are alloantibody in the patient with hematologic disorders like acute leukemia and multiple blood transfusion. These alloantibodies are IgM and IgG antibodies against alloantigens of platelets like HLA antigen.Platelets resistant was detected in 2-30% of patients with blood transfusion and in 50% patients case a unsuitable respond to platelet transfusion in patients.In this descriptive analytic Study anti platlet antibodes were detected by lymphocytotoxicity method in 18 patients that received blood and blood components in Imam Reza and Taleghani hospitals.Anti HLA antibodies detected in 9 of 18 sample of patients with blood disorder and malignance. The mean of old in samples was 24.5 years.Anti HLA antibodies were detected in 50% of study patients. There were not significant related in anti HLA antibodies and FFP, platelet rates and times of hospitalization. But between ratty and times of pack cell transfusion and anti HLA antibodies a significant related was seen.

In this paper, a numerical investigation on behavior of concrete in filled columns using nonlinear finite element method is done. Numerical results are verified using experimental results. Behavior of rolled steel tubes witch are filled with concrete of different strength on the axial applied loads is present. Effect of steel tubes thickness and confining stress are considered and the results are compared with concrete columns. The results showed that with increasing thickness of steel tubes, axial load capacity and confinement stress and ductility is increased and with increasing the concrete strength, confining stress and ductility is reduced. Specimens with different concrete strength of 30,60,80 MPaand different ratioare analyzed and all the specimens have the same length of 300 mm. The main objects are: 1) to investigate effect of prominence on axial load capacity. 2) to investigate the effect of different parameters like thickness of steel tubes, friction coefficient and the ratio of prominence area over total perimeter area. 3) to investigate effect of loading(i.e. loading concrete only or loading concrete and steel tubes simultaneous. 4) to investigate the ductility of columns.