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Number of pages: 105 Category: Geography - Urban Planning

Dissertation for Master's Degree in Natural Geography Abstract Iran is a vast country that, due to its special location and topographic features, lacks water and It has a different atmosphere. For this reason, most of Iran is in the dry climates of the world. In addition to the lack of rainfall, the extreme fluctuations of rainfall in daily, seasonal and annual scales are among ...

Number of pages: 145 Category: Physical Education - Sports

Dissertation for receiving a doctorate degree in the field of physical education, sports biomechanics, abstract: Osteoporosis is a skeletal disorder in which the mechanical strength of bones is reduced and leads to bone fractures, so it is important to pay attention to methods to maintain bone strength and prevent osteoporosis. The aim of this research was to determine the ...

Number of pages: 94 Category: Medical Sciences

((Master's Thesis)) Abstract Introduction: Helicobacter pylori is one of the most important human stomach pathogens. BabA2 Hpa HsP genes are essential in binding to gastric epithelial cells and bacterial pathogenicity. The frequency of these genes is different in different geographical regions. The aim of this study was to evaluate the frequency of BabA2, Hsp Hpa genes in ...

Number of pages: 101 Category: Facilities - Mechanics

In order to obtain a master's degree in the field of mechanical engineering, energy conversion, abstract: In this thesis, the mass and heat transfer by integral method in the flow of natural displacement of a fluid with a very low frontal near the wavy inclined wall and under the magnetic field has been investigated. The wall is permeable and as a result, the fluid can be sucked ...

Number of pages: 129 Category: Civil Engineering

Thesis for receiving a master's degree in the field of civil engineering of hydraulic structures, October 2013 This study is to quantitatively evaluate the effects of watershed operations and with the aim of evaluating the efficiency of projects

Number of pages: 148 Category: Management

Dissertation for receiving the master's degree (M.A.) public management, human resources orientation, summer 2019, abstract knowledge in today's advanced world of organizations, is rapidly becoming a competitive advantage.

Number of pages: 137 Category: Management

Dissertation for receiving a master's degree in the field of executive management of strategic orientation March month 1391 The abstract of the current research is survey in terms of method and practical in terms of purpose. society

Number of pages: 140 Category: Civil Engineering

Dissertation for Master's Degree in Civil Engineering/ Cold Water Engineering 1392 1-1- Introduction In this chapter, an overview of the concept of climate change and its causes and the effect of this phenomenon on natural resources and

Number of pages: 104 Category: Art - Graphics

Master's Thesis of Faculty of Art and Architecture, Department: Carpet (Painting), October 2013 Abstract: Today, in today's advanced and industrialized world, using new methods, it is trying to make Tul products

Number of pages: 84 Category: Educational Sciences

Dissertation for Master's Degree in Information Science and Epistemology Keywords: change management, preparation for change, library services, central library of Tarbiat Modares University, academic libraries Persian Abstract: Change means leaving one state and arriving and settling in another state. Today's organizations are facing wider changes than in the past in various ...

Number of pages: 93 Category: Literature - Persian Language

Dissertation for receiving a master's degree major: Persian language and literature Abstract: The present research is conducted with the aim of investigating the types of similes in the 6th century poet Ganjavi's military letter. The research method in this thesis is analytical and by referring to the sources dedicated to the life and style of the poet, it has been examined with ...

Number of pages: 131 Category: Geography - Urban Planning

Dissertation to receive a master's degree in the field of meteorology with an urban orientation. Abstract: The researches conducted in the world mainly indicate a gradual increase in the average temperature. Today, the trend of freezing temperatures is one of the most important climate parameters that are evaluated to prove climate change in a region. Analyzing the trend of the ...

Number of pages: 121 Category: Geography - Urban Planning

Dissertation for receiving a master's degree in the field of natural geography in the field of climate change. Abstract: With the process of global warming and water resources becoming more valuable due to population growth and the needs of industries and agriculture, numerous investigations have been conducted in line with water conservation and protection programs in line with ...

Number of pages: 91 Category: Geography - Urban Planning

Dissertation for M.A Master's Degree Field: Natural Geography Major: Climatology in Environmental Planning Abstract Climate is one of the most important basic factors for identifying the natural areas of the earth, among the climatic elements, precipitation is of great importance. By examining the rainfall areas, it is possible to identify the potential of the country's water ...

Number of pages: 190 Category: Psychology

Master's Thesis in Psychology (M.A.) Orientation: Clinical Abstract The purpose of this research was to compare the emotional schemas and cognitive distortions in people with migraine with healthy people. To do it, a causal comparative (post-event) research method was used. The statistical population was all people with migraine under treatment in the neuropsychiatric clinics of ...

Number of pages: 146 Category: Psychology

Dissertation for receiving a continuous master's degree in Psychology (M.A.) Major: General Abstract The present study was conducted with the aim of investigating the relationship between job stress, organizational commitment and constructive thinking with emotional burnout of nurses. This design is a descriptive design of the correlation type. The statistical population was ...

Number of pages: 159 Category: Geography - Urban Planning

Introduction: The present research is devoted to the investigation and study of the bottlenecks of the physical development of Shiraz from the perspective of geomorphology. In a general definition, geomorphology is: The science of swimming is the unevenness of the earth's surface and its task is to recognize and classify (classify) these shapes for planning in the environment. ...

Number of pages: 122 Category: Geography - Urban Planning

Thesis for obtaining a master's degree in the field: Geography, specialization: Climatology in environmental planning. Abstract: In this research, the monitoring and zoning of drought as well as the investigation of its different dimensions in the country of Iran using statistics and information related to precipitation and temperature for 30 years (1981-2010) of the country's ...

Number of pages: 110 Category: Geography - Urban Planning

Dissertation for Master's Degree (M.Sc) Field: Natural Geography - Hydrology and Synoptic Meteorology Abstract Damages caused by critical cold temperatures are increasing, especially in natural ecosystems and densely populated urban areas. Central Iran is a dry land prone to cold weather, especially during winter, and lacks resources to moderate temperature tensions, such as ...

Number of pages: 162 Category: Psychology

Dissertation for receiving the master's degree ""M.A"" field: psychology, orientation: clinical Abstract of the purpose: The aim of the present study is to compare parenting styles, quality of life and personality dimensions of nature and character in people with gender identity disorder and normal people. Method: 40 people with gender identity disorder and 40 normal people were ...

Number of pages: 130 Category: Librarianship

Dissertation for Master's Degree in Accounting (M.A) Abstract This research seeks to investigate the relationship between taxpayer education and the effectiveness of value added tax implementation in Ilam province and provide solutions to improve it with the fuzzy AHP approach. In terms of the purpose, the current research is of the applied research type, and according to the ...

Number of pages: 142 Category: Geography - Urban Planning

The field of natural geography, climatology trend in environmental planning Abstract: Ardabil province in the northwest of the country with its long and elongated shape has faced climatic anomalies in recent years such as: increase in temperature especially in winter season, increase in the occurrence of hot winds, increase in evaporation and transpiration potential, decrease in ...

Number of pages: 132 Category: Psychology

Faculty of Educational Sciences and Counseling Dissertation Master's Dissertation, Education Management, Abstract The present research compares the level of depression and anxiety among female teachers of exceptional and normal schools in Karaj city. The statistical population of the present study includes all female primary school teachers in the city of Karaj, of which 105 are ...

Number of pages: 171 Category: Geography - Urban Planning

Dissertation for master's degree in geography and urban planning. Abstract: The sustainability of sustainable transportation systems is not only limited to their creation. The spaces resulting from these systems are also important due to the evaluation of the efficiency of the above systems that provide the possibility of presence, movement and access in them. For this purpose, ...

Number of pages: 151 Category: Electronic Engineering

Dissertation for Master's Degree in Electrical Engineering, Power Systems, Abstract: During the last two decades, the electricity industry has undergone fundamental changes in the way it is produced, transmitted and distributed, which is referred to as restructuring. With the restructuring in the electricity industry, reactive power has been introduced as one of the most ...

Number of pages: 215 Category: Tourism - Tourism

Master's Thesis of Tourism Management Abstract Nowadays, the importance of customer orientation has increased more and more and it has been presented as the most important competitive advantage of organizations and its role in the success and progress of businesses is undeniable. The way of doing marketing operations has changed because the fields in which marketing takes place ...

Number of pages: 100 Category: Electronic Engineering

Abstract The main task of the synchronous generator excitation system is to provide the necessary voltage for the generator excitation winding. The excitation voltage is a dc voltage and it is used to create a flux in the excitation winding of the generator and consequently to produce a magnetic field to produce electrical energy by a synchronous generator. In the provided ...

Number of pages: 204 Category: Management

Dissertation for receiving the master's degree ""M.A."" » Orientation: Business Management Abstract Dealing effectively with conflict is a fundamental challenge in the interactions of people in the work environment. Conflict is a natural and inevitable phenomenon in individual and organizational life and it appears for many reasons and in different forms. The main problem in ...

Number of pages: 134 Category: Management

Master's Thesis in Industrial Engineering (System Management and Productivity) Introduction and Objective: In Mazandaran province, part of the transportation problems are related to road accidents. The resulting costs are one of the most important challenges of the province and the financial losses caused by them are imposed on the budget of the family and the province. It is ...

Number of pages: 93 Category: Art - Graphics

Dissertation for Master's degree (M.A) field: Communication Sciences Abstract of the thesis (including summary, objectives, implementation methods and results obtained), the general purpose of the current research was to investigate traffic police television commercials (Sia Saki series of programs) with regard to the components of citizenship and respect for the law. The method ...

Number of pages: 198 Category: Civil Engineering

Dissertation for receiving a master's degree in the field: civil engineering, orientation: structure. Abstract: In this paper, a new approach for optimal selection of acceleration maps and their scaling to perform dynamic time history analysis, to achieve the average response spectrum that has a suitable match and a small distance with the target spectrum and represents the ...

Number of pages: 141 Category: Civil Engineering

Dissertation for Master's Degree in Civil-Structural Engineering Abstract In our country, most of the structures and maybe all the conventional buildings are analyzed and designed independently, which means that these structures are mainly analyzed and designed by conventional software and considering a rigid or articulated support, and then the forces obtained at the base of ...

Number of pages: 98 Category: Civil Engineering

Dissertation for Master's Degree in Civil Engineering, Marine Structures, Abstract: Tension-based platforms are among economic marine platforms for use in deep waters. The correct prediction of the platform's dynamic response to environmental loads is very important in its economic and safe design. In this research, the dynamic behavior of the tension base platform under the ...

Number of pages: 159 Category: Civil Engineering

Dissertation to receive the master's degree in civil engineering ""M. Sc"" Major: Water. Abstract The aim of this thesis is to investigate the trend of annual rainfall changes in 37 selected stations in the whole of Iran using non-parametric method. The two Mann-Kendall tests and the age estimator, which are among the most common non-parametric methods, were used for the trend ...

Number of pages: 181 Category: Electrical Engineering

Master's thesis in the field of electrical engineering (field) Abstract Analysis, simulation and construction of optimized microstrip antenna or metamaterial roll and use of particle aggregation optimization (PSO) algorithm Microstrip antennas are widely used due to their unique features such as reasonable manufacturing cost and low weight, especially in wireless systems. One of ...

Number of pages: 109 Category: Electrical Engineering

Dissertation for Master's Degree in Mechatronics Engineering Persian Abstract The purpose of this project is to introduce a new approach for troubleshooting gas transmission pipelines using mechanical waves, which is much cheaper and easier than other methods. who are currently working. These lines are usually located in difficult environmental conditions and far away and in ...

Number of pages: 332 Category: Literature - Persian Language

Thesis for Master's degree ""M.A"" Abstract Khajo, the great poet of Kermani, is one of the first to write khumsa-sarai, and if we want to be more precise, he is the third person after Nizami and Amir Khosrow Dehlavi to do this. The presentation of Khajojo's poems has been done along with many stories

Number of pages: 131 Category: Civil Engineering

Dissertation for master's degree in civil engineering, structural orientation. Abstract Good bond strength between the old and new concrete surface is a key factor in the performance of concrete repairs. The purpose of this thesis is to investigate and evaluate the bond strength between the surface of the old concrete and the added concrete. In this thesis, a laboratory research ...

Number of pages: 112 Category: Electrical Engineering

Dissertation for master's degree in electrical engineering, power orientation Abstract: The use of renewable energy to produce electrical energy has increased increasingly with the expansion of the use of flexible alternating current transmission systems (FACTS), to compensate for the quality of power and voltage, the range of use of these energies has increased.

Number of pages: 137 Category: Electronic Engineering

Dissertation for master's degree in electrical engineering, power trend. Abstract Overvoltages are one of the most important factors that destroy and threaten the insulation of power network equipment and often cause interruptions in service and reduce the quality of power and reliability of the system. In addition, transient overvoltages caused by lightning are more common and ...

Number of pages: 128 Category: Civil Engineering

Master's thesis in the field of civil engineering, soil and foundation, in this research, the bearing capacity of the conical pile group and the cylindrical pile group with the same volume are calculated and compared. Due to the lack of numerical studies and modeling by software for conical piles compared to laboratory tests in this field, in this research, the modeling of the ...

Number of pages: 150 Category: Literature - Persian Language

Master's Thesis in Persian Language and Literature Abstract: Religious concepts such as theology are among abstract concepts and poets should include them in poems in a way that children of different age groups can understand. The present study investigates how religious concepts are presented in the poems of children of age groups ""A"" and ""B"" in the 1980s. The basis for the ...

Number of pages: 91 Category: Civil Engineering

Master's thesis in the field of civil engineering, river engineering, abstract, the lack of water resources and the poor quality of drinking water in the city of Qom, due to the predicted warming of the climate and the increase in the population, as well as the lack of a reliable water source within the limits of this province, reveal the necessity of carrying out the water ...

Number of pages: 126 Category: Literature - Persian Language

Dissertation: In order to receive a master's degree in Persian language and literature, abstract in the upcoming thesis, love and its affiliates have been examined in the court of Saeb Tabrizi, a renowned poet of the Indian style. For this reason, first the verses in which the word love was directly present were extracted from the Divan of the poet. Then the concepts of love ...

Number of pages: 118 Category: Literature - Persian Language

Dissertation for Master's degree (M.A.) specialization: Persian language and literature Description of the seasons in the poems of prominent poets of the Khorasani style by: Sayyed Hashem Hashemi Abstract One of the important features of the poetry of the Khorasani style, which attracts attention in the works of almost all the poets of this period, is the description of the ...

Number of pages: 160 Category: Literature - Persian Language

Thesis, in order to receive a master's degree (M.A) in the field of Persian language and literature. Abstract: Persian poetry and literature have long been mixed and familiar with the forms of fantasy. Rhetorical figures include simile, metaphor, metaphor, and irony, and for more than a thousand years, Persian language poets have made themselves familiar in their poetry. In all ...

Number of pages: 160 Category: Literature - Persian Language

Thesis, in order to receive a master's degree (M.A) in the field of Persian language and literature. Abstract: Persian poetry and literature have long been mixed and familiar with the forms of fantasy. Rhetorical figures include simile, metaphor, metaphor, and irony, and for more than a thousand years, Persian language poets have made themselves familiar in their poetry. In all ...

Number of pages: 102 Category: Medical Sciences

Dissertation for Master's degree in Health Sciences in Nutrition Abstract Introduction Researches indicate the prevalence of blood lipid disorders in childhood and adolescence. Considering the formation of eating habits from childhood and adolescence and the impact on health or illness in adulthood, the present study was conducted with the aim of determining the correlation ...

Number of pages: 142 Category: Physical Education - Sports

Dissertation for Master's Degree (M.A) Major: Sports Biomechanics Abstract: The purpose of this research was to find talent in the seven subject of athletics based on biomechanics, anthropometrics and physical fitness. The statistical population of the current research included female athletics athletes (12-16) of Kermanshah city, among whom 32 teenage girls, members of the ...

Number of pages: 92 Category: Physical Education - Sports

Master's Thesis Abstract Education as one of the social institutions has an important role and position in the society. The starting point of the analysis of the sociology of education is the social study of the school influenced by Parsons' theories. Parsons' model of the four functions of the social system provides a suitable context (from a sociological point of view) for the ...

Number of pages: 85 Category: Health - Health

Dissertation to receive a master's degree in intensive care nursing Introduction: Maintaining safety and preventing side effects, especially in patients hospitalized in wards, has become a global concern in the field of health and health, and has led to the issue of the effectiveness of working environment conditions. Objectives: This study was conducted with the aim of ...

Number of pages: 104 Category: Medical Sciences

Dissertation for the degree of Doctor of General Medicine Abstract Introduction: Kidney stones have been known since ancient times. Bladder stones have been seen in the examination of Egyptian mummies from 7000 years ago. Urinary stones are the third most common disease of the urinary tract, and the evidence shows that the incidence of this disease has continuously increased in ...

Number of pages: 75 Category: Electronic Engineering

The master's thesis for obtaining a master's degree is an abstract of facial recognition in the fields of biometrics, machine vision, and pattern recognition, and has a wide range of applications, including issues related to security systems. Since various factors such as ambient lighting, noise, and image opacity are more or less effective in the performance of face recognition ...

Number of pages: 128 Category: Electrical Engineering

Master's thesis in the field of electrical engineering (power trend) Abstract of the investigation of transient electromagnetic states in wind turbines with the increasing development of wind turbines, increasing its efficiency has become more critical. One of the factors for measuring wind turbine efficiency is its performance in transient state problems. The phenomena that ...

Number of pages: 122 Category: Biology - Environment

Dissertation for Master's Degree (M.Sc.) Orientation: Environment Abstract Environmental risk assessment is the examination of risks that result from natural events, technology, practices and methods, processes, productions, chemical, biological, radiological and industrial activities and may threaten ecosystems, animals and people. A preliminary research has been done in the ...

Number of pages: 142 Category: Physical Education - Sports

Dissertation for Master's degree (M.A.) Major: Sports Management Abstract: The current research was developmental-applicative in terms of purpose and descriptive-survey in terms of data collection method. The statistical population in this research included all principals and physical education teachers of elementary schools in Tehran in the academic year 2012-1393. This ...

Number of pages: 110 Category: Electronic Engineering

Dissertation for Master's Degree in Mechatronics Engineering Persian Abstract The purpose of this project is to introduce a new approach for troubleshooting gas transmission pipelines using mechanical waves, which is much cheaper and easier than other methods. who are currently working. These lines are usually located in difficult environmental conditions and far away and in ...

Number of pages: 60 Category: Medical Sciences

Dissertation for the degree of Doctor of General Medicine Title: Investigating the rate and causes of episiotomy in Yazidi and Al-Zahra Hospital Qom in 2013 Authors: Dr. Ruqieh Ahangari - Bahareh Karimi Hasnijeh Abstract: Introduction: Considering the complications such as infection, pain, hematoma, 3rd and 4th degree lacerations and that episiotomy seems to be more than ...

Number of pages: 118 Category: Electrical Engineering

Dissertation for master's degree in electrical engineering, power trend. Abstract Overvoltages are one of the most important factors that destroy and threaten the insulation of power network equipment and often cause interruptions in service and reduce the quality of power and reliability of the system. In addition, transient overvoltages caused by lightning are more common and ...

Number of pages: 94 Category: Facilities - Mechanics

Master's Thesis in Mechanical Engineering, Applied Design, Abstract In this research, an analytical solution is presented to show the size dependence and the effect of temperature difference on nonlinear free vibrations and post-buckling behavior of microtubes containing current. Based on Euler-Bernoulli model, strain gradient theory, Couple's stress theory and von-Carman ...

Number of pages: 129 Category: Facilities - Mechanics

Dissertation for Master's Degree in Mechanical Engineering (Applied Design) Abstract: Electromechanical micro and nano systems have been noticed due to their distinctive features and unique characteristics, mainly in the two fields of sensors and sensors, in various sciences such as mechanics, aerospace and medicine. Electrostatic stimulation is one of the simplest and most ...

Number of pages: 95 Category: Facilities - Mechanics

Dissertation for Master's Degree in Mechanical Engineering (Applied Design) Abstract In this research, the analysis of vibrations, buckling and wave propagation of wrapped nano beam under axial load on Pasternak substrate is discussed. First, the displacement and displacement field of the wrapped beam is obtained. Then, using the obtained displacement field, strain-displacement ...

Number of pages: 67 Category: Medical Sciences

Dissertation for receiving a professional doctorate degree Introduction: According to the studies conducted, the prevalence of various causes of intestinal obstruction is different in the west and east of the planet, and finding the common causes in Shahrood, which is the goal of this research project, can lead the doctor to a better diagnosis. During the studies that were ...

Number of pages: 73 Category: Electronic Engineering

Abstract Face recognition is in the fields of biometrics, machine vision and pattern recognition and has a wide range of applications including issues related to security systems. Since various factors such as ambient lighting, noise, and image opacity are more or less effective in the performance of face recognition methods, therefore, investigating the methods of removing blur ...

Number of pages: 80 Category: Chemical - Petrochemical Engineering

Thesis for obtaining a master's degree in the field: Chemistry, specialization: Analytical Chemistry, Abstract In recent years, the use of nanotubes as nanocarriers for drug delivery has been researched. In this research, carbon nanotubes CNT(5-5), CNT(0-6), BNNT(0-6) and BNNT(5-5) doped with Ga have been used. First, the nanotubes were drawn using Gauss View and Nanotube ...

Number of pages: 90 Category: Agricultural Engineering

Master's thesis in the field of agriculture, plant breeding, abstract. After drought stress, salinity stress is the second limiting factor for the performance of agricultural plants at the global level. Based on the division of plants in terms of tolerance to salinity stress, sorghum is placed in the semi-tolerant class, and its salinity tolerance threshold is 4.9 to 6.8 ...

Number of pages: 70 Category: Electronic Engineering

Dissertation for Master's Degree in Medical Engineering Abstract Cardiac arrhythmias are one of the heart diseases that should be taken care of in patients admitted to the intensive care unit. Smartening the process of accurate diagnosis of heart diseases is a problem that has attracted the attention of researchers for years. In this research, an efficient method for selecting ...

Number of pages: 64 Category: Food and Packaging Industries

Dissertation for M. Sc. Abstract Nitrates, nitrites and ascorbic acid are present in a wide range of foods. Vegetables are an important source of nitrate, nitrite and ascorbic acid absorption in the diet. The purpose of this research is to investigate the effect of freezing and cooking process on the amount of nitrate, nitrite and ascorbic acid of commonly consumed vegetables. ...

Number of pages: 85 Category: Electrical Engineering

Abstract The main task of the synchronous generator excitation system is to provide the necessary voltage for the generator excitation winding. The excitation voltage is a dc voltage and it is used to create a flux in the excitation winding of the generator and consequently to produce a magnetic field to produce electrical energy by a synchronous generator. In the provided ...

Number of pages: 61 Category: Food and Packaging Industries

Food Science Engineering Thesis for receiving the master's degree ""M. Sc"" Abstract Nitrate, nitrite and ascorbic acid are present in a wide range of foods. Vegetables are an important source of nitrate, nitrite and ascorbic acid absorption in the diet. The purpose of this research is to investigate the effect of frying and boiling process on the amount of nitrate, nitrite and ...

Number of pages: 107 Category: Electrical Engineering

Dissertation for Master's Degree in Electrical Engineering, Power Systems, Abstract: During the last two decades, the electricity industry has undergone fundamental changes in the way it is produced, transmitted and distributed, which is referred to as restructuring. With the restructuring in the electricity industry, reactive power has been introduced as one of the most ...

Number of pages: 111 Category: Paramedical

Master's thesis in special care nursing Abstract: Introduction: The patient who is admitted to the special care department is exposed to sensory deprivation for various reasons. The results of studies indicate the positive effect of sensory stimulation in preventing sensory deprivation, but the role of the family compared to nurses in performing sensory stimulation has not yet ...

Number of pages: 70 Category: Law and Jurisprudence

Dissertation for obtaining a doctorate degree in dentistry Abstract: Introduction and purpose: One of the most important occupational tensions that dentists may face in their profession is patient complaints. The purpose of this study is to present a picture of dental malpractices in Mashhad. Materials and methods: The file of complaints received by the Mashhad Medical System ...

Number of pages: 53 Category: Food and Packaging Industries

Master's thesis in the field of agricultural engineering - food science and food industry - food chemistry. Abstract of the research: In this research, strong electric fields with short square pulses and a time scale between microseconds and milliseconds were used to sanitize liquid foods, and food products were processed under environmental conditions or low temperatures and ...

Number of pages: 115 Category: Facilities - Mechanics

Dissertation for M.Sc Master's degree, mechanical engineering-applied design Abstract With the emergence of composite materials, a huge progress was achieved in many engineering applications. Nevertheless, problems such as delamination, stress concentration, and discontinuous distribution of stress, the idea of ??creating a new type of composite materials in which properties ...

Number of pages: 108 Category: Facilities - Mechanics

Master's Thesis in Mechanical Engineering-Applied Design Abstract In this thesis, classical sheet theories, first-order shear deformation theory and refined two-variable theory for the free vibration problem are investigated using standard finite element and hierarchical finite element methods. The refined two-variable theory is an equivalent single-layer theory, in which two ...

Number of pages: 107 Category: Facilities - Mechanics

Dissertation for M.Sc Master's Degree, Mechanical Engineering - Applied Design Abstract Modern wind turbines today tend to vibrate a lot due to their elastic, long and narrow structure. Therefore, all components of wind turbines should be subjected to vibration and modal analysis in the design stages, and their natural frequencies should be reviewed with turbine excitation ...

Number of pages: 178 Category: Electrical Engineering

Master's thesis in the field of electrical engineering (field) Abstract Analysis, simulation and construction of optimized microstrip antenna or metamaterial roll and use of particle aggregation optimization (PSO) algorithm Microstrip antennas are widely used due to their unique features such as reasonable manufacturing cost and low weight, especially in wireless systems. One of ...

Number of pages: 79 Category: Agricultural Engineering

Dissertation for receiving a master's degree in the field of agricultural engineering-horticulture (flowers and ornamental plants) Electromagnetism with a short wavelength and a very high number of oscillations (frequency) is between 300 MHz and several GHz per second. In this research, from the 2M226 magnetron with a wavelength of 12 cm, radiating waves in the frequency band of ...

Number of pages: 146 Category: Facilities - Mechanics

Mechanical Engineering - Applied Design Orientation Abstract: Vibration is one of the important and basic concepts in engineering sciences. In simple words, any system that has mass and spring property has the ability to vibrate and can vibrate at a natural frequency. It can be said with certainty that 95% of vibrations in industries are harmful to systems. If the system is in ...