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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of School Administration
- نوع مقاله: Journal Article
- کلمات کلیدی: Reflection,Identity,Awareness,Social status,Social inequality
- چکیده: این پژوهش با هدف شناخت عوامل و زمینههای اجتماعی و فرهنگی مؤثر بر بازگشت دختران ازدواج کرده شهر تهران به تحصیل با روش آمیخته متوالی اکتشافی(کیفی با روش تحلیل تماتیک و کمی با روش علی- مقایسهای پسارویدادی با گروه ملاکی) انجام شده است. در بخش کیفی با 36 نفر از زنان بازگشته به تحصیل، با روش نمونه گیری هدفمند با معیار اشباع نظری و مصاحبه نیمه ساختارمند دادهها جمع آوری و با رویکرد ولکات تحلیل شده است.در بخش کمی، جامعه آماریِ مبنا، تمام زنان ازدواج کرده بازگشته به تحصیل در شهر تهران بودند که 426 نفر از آنان با استفاده از روش نمونه-گیری خوشهای چندمرحلهای انتخاب شدند. برابر با همین تعداد(426 نفر)، با استفاده از همتاسازی گروهی از بین زنان ترک تحصیل کرده بدون بازگشت انتخاب شدند. برای تحلیل کمی، از آزمونهای رگرسیون لوجستیک دوگانه عادی و شرطی استفاده شده است. با انجام تحلیل کیفی درونمایه اصلی " استراتژی جستجوی خودهای ممکن برای تعادل بخشی به ساحت های مختلف مسیر زندگی" استخراج ارائه شده است. نتایج آزمون رگرسیون لوجستیک دومتغیره نشان داد بین دوگروه از زنان مورد مطالعه در متغیرهای برابری جنسیتی، نیاز مالی خانواده، کسب منزلت اجتماعی، تمایل به آگاهی بیشتر، تجارب سخت مسیر زندگی، میزان تابآوری و میزان فمینیسمگرایی تفاوت معنیدار وجود دارد و این متغیرها قابلیت پیشبینی احتمال بازگشت به تحصیل در بین زنان ازدواج کرده را دارند. متغیرهای کسب آگاهی، تابآوری و کسب منزلت اجتماعی مهمترین پیشبینی کننده های احتمال بازگشت زنان ازدواج کرده به مدرسه بودند.
- چکیده انگلیسی: This study aimed to identify the social and cultural motivations affecting the return of married women to school by consecutive exploratory mixed method (qualitative by thematic analysis and quantitative by causal-comparative method). Education and employment, as the most important areas of the new identity experience, provide the ground for cultural and identity changes, and women choose new identities to adapt and define a different identity from others to adapt to the social environment. . At the same time, the individual, family and traditional expectations of society from women have defined them more in maternal and marital plans, and new contexts have added different expectations to the new plans. This study focuses on a specific group of women. Women who for any reason have dropped out of school (dropped out) and entered a new phase of their lives (marriage), but after marriage and experience different conditions for each (continuation of cohabitation / divorce / death of spouse / divorce) / Suspension), have chosen the path to return to school. This group of women is known in the conventional educational management literature as Non-Traditional students. This group of women, especially in Iran, is unknown in many ways, even in educational management circles; they are considered as adults only and are judged under the influence of common stereotypes.
This research is applied in terms of purpose and descriptive-analytical in terms of type with an exploratory approach. The present study is an adaptation of the typology presented by Creswell (2004) of the type of consecutive mixed exploratory research in which first qualitative research with thematic analysis technique and then based on its results, quantitative method causal-post-event comparisons with the criterion group. The paradigmatic approach of the present study (in the qualitative part) is the interpretive constructivism approach. Interpretiveism in general is the systematic analysis of socially meaningful action through the direct detailed observation of people in natural contexts. In the qualitative section with 36 women returning to education, data were collected by purposeful sampling with theoretical saturation criterion and semi-structured interview and were analyzed with Walcott approach. Based on the results of qualitative interviews conducted with 36 married / returned women and considering the nature and objectives of research in the quantitative sector, the theoretical framework supporting the research hypotheses in the quantitative sector is a combination of Giddens' rethinking theory, field and space theory of Bourdieu, social theories of inequality (especially Max Weber), feminist theories, and the theory of resilience. In the quantitative part of the base statistical population, all married women returned to education in Tehran, 426 of whom were selected using multistage cluster sampling. An equal number (426) were selected using a matched cohort of non-returning educated women. To determine the validity of structural validity using confirmatory factor analysis test (in Amos software) and to determine the reliability of internal consistency coefficient (Cronbach's alpha) in SPSS software was used which based on the results, validity and reliability of the tool for all The main variables of the research were within the acceptable range. For quantitative analysis, ordinary and conditional dual logistic regression tests were used.
A qualitative analysis of the main themes of the "strategy of searching for possible selves to balance different aspects of life" is presented. This basic theme is the result of the interaction of its two main and self-contained categories, which comprise nine subcategories. It can be said that positive and negative motivational mechanisms in their core category of self can lead women to choose a new career path. At the same time, the beginning and the continuation of this path in the lives of women is also based on other axes called ex-self, which has its own complexities and always puts women in a series of social interactions. Finally, these results are presented as social, cultural and economic factors and have been used in a small part of research. According to the final thematic map, women create the context for returning to school as a possible self-search through an interactive and fluid process over time, and to reduce imbalances due to the failure to meet needs, expectations and goals. They choose the two-way path of education / employment as ways of self-realization. In completing and theoretically comparing this thematic map with others, the views on the formation of social identity and individual identity can be reflected; Content perspectives and personality processes to reduce internal tensions; and pondered biological theories for growth and prosperity. The results of the investigation of the main hypothesis of the study showed that all the independent variables included in the model were able to predict the probability of the dependent variable returning to education of married women and their ability to predict the error was less than 0.01. On the other hand, among the variables, the variable of awareness with the parent statistic value (78.56) is the most capable of predicting the dependent variable of return to education in married women, and the variables of resilience and social status in the next important categories. They are the best predictors.
What we call the main theme of this study, the strategy of searching for possible selves to balance different areas of life, is the result of achieving analytical results from interviews with the women studied. A strategy through which women are experiencing multiple identity spaces and consequently finding desirable selves / unfulfilled selves and possible selves. This modernist strategy has found meaning for women, which has led to their multifaceted presence and social participation in various fields. This strategy shapes women's actions not only in the individual space, but also in the larger social and cultural contexts. Women, as creative activists, reflect on their thoughts through processes of mental dynamics in line with the rapid changes in the world of modernity, and reflect their attitudes by renewing the powers of knowledge and insight. Society, on the other hand, presents the image of education as a regulated social reality that can be considered as part of one's individual identity. Therefore, choosing education as a way to define individual and social identity will not be unexpected. Women use social experiences to build their own self-organization and return to the social sphere by inventing ways to achieve themselves. This innovation and rethinking of education paves the way for women to enter the field of employment by continuing their education.
- انتشار مقاله: 15-11-1398
- نویسندگان: Fatemeh Rostami,Ozra Jarollahi,Mohammad Taghi Karami,Mohammad Zahedi Asl
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of School Administration
- نوع مقاله: Journal Article
- کلمات کلیدی: Reflection,Identity,Awareness,Social status,Social inequality
- چکیده: این پژوهش با هدف شناخت عوامل و زمینههای اجتماعی و فرهنگی مؤثر بر بازگشت دختران ازدواج کرده شهر تهران به تحصیل با روش آمیخته متوالی اکتشافی(کیفی با روش تحلیل تماتیک و کمی با روش علی- مقایسهای پسارویدادی با گروه ملاکی) انجام شده است. در بخش کیفی با 36 نفر از زنان بازگشته به تحصیل، با روش نمونه گیری هدفمند با معیار اشباع نظری و مصاحبه نیمه ساختارمند دادهها جمع آوری و با رویکرد ولکات تحلیل شده است.در بخش کمی، جامعه آماریِ مبنا، تمام زنان ازدواج کرده بازگشته به تحصیل در شهر تهران بودند که 426 نفر از آنان با استفاده از روش نمونه-گیری خوشهای چندمرحلهای انتخاب شدند. برابر با همین تعداد(426 نفر)، با استفاده از همتاسازی گروهی از بین زنان ترک تحصیل کرده بدون بازگشت انتخاب شدند. برای تحلیل کمی، از آزمونهای رگرسیون لوجستیک دوگانه عادی و شرطی استفاده شده است. با انجام تحلیل کیفی درونمایه اصلی " استراتژی جستجوی خودهای ممکن برای تعادل بخشی به ساحت های مختلف مسیر زندگی" استخراج ارائه شده است. نتایج آزمون رگرسیون لوجستیک دومتغیره نشان داد بین دوگروه از زنان مورد مطالعه در متغیرهای برابری جنسیتی، نیاز مالی خانواده، کسب منزلت اجتماعی، تمایل به آگاهی بیشتر، تجارب سخت مسیر زندگی، میزان تابآوری و میزان فمینیسمگرایی تفاوت معنیدار وجود دارد و این متغیرها قابلیت پیشبینی احتمال بازگشت به تحصیل در بین زنان ازدواج کرده را دارند. متغیرهای کسب آگاهی، تابآوری و کسب منزلت اجتماعی مهمترین پیشبینی کننده های احتمال بازگشت زنان ازدواج کرده به مدرسه بودند.
- چکیده انگلیسی: This study aimed to identify the social and cultural motivations affecting the return of married women to school by consecutive exploratory mixed method (qualitative by thematic analysis and quantitative by causal-comparative method). Education and employment, as the most important areas of the new identity experience, provide the ground for cultural and identity changes, and women choose new identities to adapt and define a different identity from others to adapt to the social environment. . At the same time, the individual, family and traditional expectations of society from women have defined them more in maternal and marital plans, and new contexts have added different expectations to the new plans. This study focuses on a specific group of women. Women who for any reason have dropped out of school (dropped out) and entered a new phase of their lives (marriage), but after marriage and experience different conditions for each (continuation of cohabitation / divorce / death of spouse / divorce) / Suspension), have chosen the path to return to school. This group of women is known in the conventional educational management literature as Non-Traditional students. This group of women, especially in Iran, is unknown in many ways, even in educational management circles; they are considered as adults only and are judged under the influence of common stereotypes.
This research is applied in terms of purpose and descriptive-analytical in terms of type with an exploratory approach. The present study is an adaptation of the typology presented by Creswell (2004) of the type of consecutive mixed exploratory research in which first qualitative research with thematic analysis technique and then based on its results, quantitative method causal-post-event comparisons with the criterion group. The paradigmatic approach of the present study (in the qualitative part) is the interpretive constructivism approach. Interpretiveism in general is the systematic analysis of socially meaningful action through the direct detailed observation of people in natural contexts. In the qualitative section with 36 women returning to education, data were collected by purposeful sampling with theoretical saturation criterion and semi-structured interview and were analyzed with Walcott approach. Based on the results of qualitative interviews conducted with 36 married / returned women and considering the nature and objectives of research in the quantitative sector, the theoretical framework supporting the research hypotheses in the quantitative sector is a combination of Giddens' rethinking theory, field and space theory of Bourdieu, social theories of inequality (especially Max Weber), feminist theories, and the theory of resilience. In the quantitative part of the base statistical population, all married women returned to education in Tehran, 426 of whom were selected using multistage cluster sampling. An equal number (426) were selected using a matched cohort of non-returning educated women. To determine the validity of structural validity using confirmatory factor analysis test (in Amos software) and to determine the reliability of internal consistency coefficient (Cronbach's alpha) in SPSS software was used which based on the results, validity and reliability of the tool for all The main variables of the research were within the acceptable range. For quantitative analysis, ordinary and conditional dual logistic regression tests were used.
A qualitative analysis of the main themes of the "strategy of searching for possible selves to balance different aspects of life" is presented. This basic theme is the result of the interaction of its two main and self-contained categories, which comprise nine subcategories. It can be said that positive and negative motivational mechanisms in their core category of self can lead women to choose a new career path. At the same time, the beginning and the continuation of this path in the lives of women is also based on other axes called ex-self, which has its own complexities and always puts women in a series of social interactions. Finally, these results are presented as social, cultural and economic factors and have been used in a small part of research. According to the final thematic map, women create the context for returning to school as a possible self-search through an interactive and fluid process over time, and to reduce imbalances due to the failure to meet needs, expectations and goals. They choose the two-way path of education / employment as ways of self-realization. In completing and theoretically comparing this thematic map with others, the views on the formation of social identity and individual identity can be reflected; Content perspectives and personality processes to reduce internal tensions; and pondered biological theories for growth and prosperity. The results of the investigation of the main hypothesis of the study showed that all the independent variables included in the model were able to predict the probability of the dependent variable returning to education of married women and their ability to predict the error was less than 0.01. On the other hand, among the variables, the variable of awareness with the parent statistic value (78.56) is the most capable of predicting the dependent variable of return to education in married women, and the variables of resilience and social status in the next important categories. They are the best predictors.
What we call the main theme of this study, the strategy of searching for possible selves to balance different areas of life, is the result of achieving analytical results from interviews with the women studied. A strategy through which women are experiencing multiple identity spaces and consequently finding desirable selves / unfulfilled selves and possible selves. This modernist strategy has found meaning for women, which has led to their multifaceted presence and social participation in various fields. This strategy shapes women's actions not only in the individual space, but also in the larger social and cultural contexts. Women, as creative activists, reflect on their thoughts through processes of mental dynamics in line with the rapid changes in the world of modernity, and reflect their attitudes by renewing the powers of knowledge and insight. Society, on the other hand, presents the image of education as a regulated social reality that can be considered as part of one's individual identity. Therefore, choosing education as a way to define individual and social identity will not be unexpected. Women use social experiences to build their own self-organization and return to the social sphere by inventing ways to achieve themselves. This innovation and rethinking of education paves the way for women to enter the field of employment by continuing their education.
- انتشار مقاله: 15-11-1398
- نویسندگان: Fatemeh Rostami,Ozra Jarollahi,Mohammad Taghi Karami,Mohammad Zahedi Asl
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Health Literacy
- نوع مقاله: Journal Article
- کلمات کلیدی: Education,conflict,marriage
- چکیده:
- چکیده انگلیسی: Background and objective: Commitment is one of the most important components of a successful marriage that without it, the marital commitment will be superficial, apparent and without direction. In this case, the couples are not able to experience the depth of love and intimacy which create because of loyalty, commitment, and marriage. The Study had done the impact of the effect of educational assemble program of practical application of intimate relationship skills (PAIRS) on marital commitment.
Methods: This study was a quasi-experimental study that was conducted in a pretest-posttest control group method. The study population was couples that referred to Aram counseling and psychological services center in Gorgan were in the second quarter of 2016. Sample study was 20 couples who were selected and replaced in the experimental and control groups. Evaluation of using Adams and Jones’s standard questionnaire marital commitment took place. Couples of experimental group received the training based on the practical application of intimate relationship skills in 13 weekly sessions of group therapy. Data Analysis with SPSS 20 software and analysis of covariance was performed.
Results: The results showed that the practical application of skills intimate relationship, the couple's marital commitment in the experimental group has improved.
Conclusion: Due to the results of this study recommended to marriage and family counselors that operate of this marriage enrichment program in marital counseling centers and workshops to improve a couple's intimate relationships and increase satisfaction.
Paper Type: Research Article.- انتشار مقاله: 30-11-1394
- نویسندگان: Amir Gerafar,Seyed Mostafa Pouryahya,Kianoush Zahrakar,Mohammad Shakarami,Reza Davarniya
- مشاهده
- جایگاه : پژوهشی
- مجله: Radiation Physics and Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Monte Carlo simulation,pattern recognition,Volume fraction,Adaptive neuro-fuzzy inference system,Three-phase flow
- چکیده:
- چکیده انگلیسی: The used metering technique in this study is based on the dual energy (Am-241 and Cs-137) gamma ray attenuation. Two transmitted NaI detectors in the best orientation were used and four features were extracted and applied to the model. This paper highlights the application of Adaptive Neuro-fuzzy Inference System (ANFIS) for identifying flow regimes and predicting volume fractions in gas-oil-water multiphase systems. In fact, the aim of the current study is to recognize the flow regimes based on dual energy broad-beam gamma-ray attenuation technique using ANFIS. In this study, ANFIS is used to classify the flow regimes (annular, stratified, and homogenous) and predict the value of volume fractions. To start modeling, sufficient data are gathered. Here, data are generated numerically using MCNPX code. In the next step, ANFIS must be trained.
According to the modeling results, the proposed ANFIS can correctly recognize all the three different flow regimes, and other ANFIS networks can determine volume fractions with MRE of less than 2% according to the recognized regime, which shows that ANFIS can predict the results precisely.- انتشار مقاله: 24-07-1397
- نویسندگان: Gholam Hossein Roshani,Alimohammad Karami,Ehsan Nazemi,Cesar Marques Salgado
- مشاهده
- جایگاه : پژوهشی
- مجله: Quarterly Journal of Applied Chemical Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Environmental pollution,Magnetic nanoparticle,New Adsorbent,PVAGLPs
- چکیده:
- چکیده انگلیسی: Polyvinyl alcohol/ glycerin- magnetic iron oxide nanoparticles (PVAGLPs) have been synthesized successfully by hydrothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectra (FTIR). The adsorbed activities of the polyvinyl alcohol/ glycerin- magnetic iron oxide nano particles (PVAGLPs) were carried out varying parameters for adsorption Cr (III) and Hg (II) ions. Adsorption experiments were carried out varying parameters such as initial metal ion concentration (10-100 ml/g), pH (1-9), contact time (10-120 min) and weight of adsorbents (0.1-0.6 g). The increase in metal uptake with increase in dose of adsorbent from 0.1 – 0.6g was due to the increase in surface area and number of active sites for the adsorption. Shows that the adsorbent of metal ions increased from 65 to 92% and 54 to 82% for Hg (II) and Cr (III) respectively. Optimum conditions for the removal of Cr (III) and Hg (II) with PVAGLPs are: 0.4 g of adsorbent, concentration 50 ppm, at 25°C and at pH 5.0 for Cr (III) and 4.0 for Hg (II).
- انتشار مقاله: 01-05-1395
- نویسندگان: Mohammad Alikarami,Zahra Abbasi
- مشاهده
- جایگاه : پژوهشی
- مجله: Pure Life
- نوع مقاله: Journal Article
- کلمات کلیدی: coping strategies,Methodology,Cyberspace,Anti-Religious Propaganda,Advertise
- چکیده: تبلیغات گسترده ضد دینی در فضای مجازی، حاکی از آن است که دولت ها و رسانه های غربی، گسترش بیداری اسلام و گرایش به اسلام را تاب نمی آورند و با تبلیغات نادرست، میکوشند چهره اسلام را در جهان، تیره و تار نشان دهند. شناخت روش های جدید و گوناگون در این زمینه، به مسلمانان کمک می کند با آشنایی راهبردی تاکتیک های دشمن، محتوای غنی دینی را متناسب با نیاز مخاطب ارائه نماید که عمده ترین تاکتیک های دشمن در این زمینه عبارت است از نمایش زننده برخی اعتقادات غیر دینی به نام دین، پُررنگ نمودن عرفان های کاذب و انحرافی به عنوان گرایشات دینی، تولید ابزارهای جدید و متنوع در عرصه تکنولوژی در راستای اشاعه فحشا و دین گریزی کاربران و به ویژه نوجوانان و سوء استفاده از نقاط ضعف حکومت های اسلامی در استفاده از تکنولوژی های نو در عرصه نظارت و مدیریت.
پژوهشگران در این مقاله تلاش کرده اند با گردآوری آرا و نظرات مختلف صاحب نظران به مطالعه و بررسی راه های متنوع نفوذ دشمن و تبلیغات ضد دینی در فضای مجازی در اذهان کاربران پرداخته و با معرفی این راه ها و ارائه راهکارهای مقابله با تهاجم دشمن- در این زمینه- به واکسینه نمودن مخاطبان فضای مجازی کمک نمایند.- چکیده انگلیسی: Widespread anti-religious propaganda in cyberspace indicates that Western governments and media do not tolerate the spread of Islamic awakening and inclination to Islam, and with false propaganda, they try to portray the face of Islam in the world. Knowing the new and various methods in this field, helps Muslims to provide rich religious content in accordance with the needs of the audience with the strategic familiarity of the enemy's tactics. The main tactics of the enemy in this field are to show some non-religious beliefs. In the name of religion, highlighting false and deviant mysticism as religious tendencies, producing new and diverse tools in the field of technology in order to spread prostitution and apostasy of users, especially teenagers, and exploiting the weaknesses of Islamic governments in using technologies. New in the field of monitoring and management.
In this article, researchers have tried to study the various ways of enemy infiltration and anti-religious propaganda in cyberspace by collecting the opinions and opinions of various experts and by introducing these ways and offering solutions to counter the enemy aggression. This context - to help vaccinate cyberspace audiences.- انتشار مقاله: 26-07-1396
- نویسندگان: Mahdi Amrabadi,Mohammad Ismaeil Abdollahi,Mohammad Karaminia
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Rehabilitation in Civil Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: geogrid,Rehabilitated road way,Pavement settlement,Soil/load condition
- چکیده:
- چکیده انگلیسی: One of the efficient techniques to improve the behavior of the paved road under traffic loads is implementing the geosynthetic material in the sub-base or the soil under the road. In the past years, many researches have been done about this topic, but the study on the effect of soil/load conditions on the performance of the rehabilitated paved road by geogrid in order to investigate the effective parameters on it is still open. In this paper a series of 2D FEM models using the software PLAXIS-2D are carried out to evaluate the effects of soil/load conditions which includes the effect of the subgrade material and load properties (such as modulus of elasticity, Poisson's ratio, drainage conditions, shear strength and the area of load), in the presence of soil-geogrid-interaction. The results showed that the use of a geogrid reinforcement layer decreases the vertical settlement in a soft subgrade surface, and this indicates that the main mechanism of the geogrid is to restrain soils from lateral displacement through interlocking with the particles. In addition, it is concluded that increasing the Poisson's ratio of the subgrade leads to reducing the vertical settlement and increasing the value of modulus elasticity leads to decrease of the vertical displacement, it is also shown that with increasing un-drained shear strength, vertical deflection has also decreased.
- انتشار مقاله: 10-01-1395
- نویسندگان: Mohammad Iman Khodakarami,Hamed Khakpour Moghaddam
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Aerospace Science and Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Bifurcation,Poincaré map,Preload,Tow-lobe bearing
- چکیده:
- چکیده انگلیسی: This paper presents the effect of preload on nonlinear dynamic behavior of a rigid rotor supported by two-lobe aerodynamic noncircular journal bearing. A finite element method is employed to solve the Reynolds equation in static and dynamical states and the dynamical equations are solved using Runge-Kutta method. To analyze the behavior of the rotor center in the horizontal and vertical directions under different operating conditions, the dynamic trajectory, the power spectra, the Poincare maps and the bifurcation diagrams are used. From this study, results show how the complex dynamic behavior of this type of system comprising periodic, -periodic and quasi-periodic responses of the rotor center varies with changes in preload values by considering two bearing aspect ratio. The results of this study contribute to a better understanding of the nonlinear dynamics of two-lobe aerodynamic noncircular journal bearing system.
- انتشار مقاله: 29-01-1389
- نویسندگان: R. Rashidi,A. Karami Mohammadi Karami Mohammadi,F. Bakhtiari Nejad Bakhtiari Nejad
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Aerospace Science and Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Bifurcation,Poincaré map,Preload,Tow-lobe bearing
- چکیده:
- چکیده انگلیسی: This paper presents the effect of preload on nonlinear dynamic behavior of a rigid rotor supported by two-lobe aerodynamic noncircular journal bearing. A finite element method is employed to solve the Reynolds equation in static and dynamical states and the dynamical equations are solved using Runge-Kutta method. To analyze the behavior of the rotor center in the horizontal and vertical directions under different operating conditions, the dynamic trajectory, the power spectra, the Poincare maps and the bifurcation diagrams are used. From this study, results show how the complex dynamic behavior of this type of system comprising periodic, -periodic and quasi-periodic responses of the rotor center varies with changes in preload values by considering two bearing aspect ratio. The results of this study contribute to a better understanding of the nonlinear dynamics of two-lobe aerodynamic noncircular journal bearing system.
- انتشار مقاله: 29-01-1389
- نویسندگان: R. Rashidi,A. Karami Mohammadi Karami Mohammadi,F. Bakhtiari Nejad Bakhtiari Nejad
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Sludge,TNT,Rhamnolipid,induced aeration
- چکیده:
- چکیده انگلیسی: This study describes the biological degradation of TNT by using induced aeration. Three plastic reactors were used. In each reactor 3 kg of soil were used. In order to increase the porosity of the soil, sawdust was added to soil. Textile wastewater treatment plant sludge was also added to soil. TNT at the concentrations of 1000 mg/kg of soil was added thereafter. Rhamnolipid biosurfactant at the concentration of 60 mg/L was added to related reactors. Aeration interval was at every 3 to 5 days. Every two weeks, sampling of soil were done to analyze the explosives. Samples were analyzed by HPLC. The results showed that at the end of 120 days, TNT removal efficiency in induced aeration in reactors containing sludge and biosurfactant was 98 percent. COD removal efficiency in induced aeration in reactors amended by rhamnolipid was 58 percent and in reactors to which rhamnolipid was not added was 41 percent. Follow-up kinetic studies revealed that explosives removal follow the pseudo first order reaction. The pseudo first-order rate constants of rhamnolipid amended experiments were at least 3.89 orders of magnitude higher for TNT than those found for experiments without rhamnolipid. Application of Rhamnolipid biosurfactant could have a protective effect against the toxicity of explosives for bacteria. Textile sludge from wastewater treatment plant can decrease the time needed for explosive removal. Growth of bacteria and degradation of explosives showed that explosives have been used as a nitrogen source.
- انتشار مقاله: 11-10-1395
- نویسندگان: Mohammad Amin Karami,Bahram Kamarehie,Mansour Ghaderpoori,Ali Jafari,Ahmad Akrami,Fateme Baghban Shahri
- مشاهده