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Dissertation for receiving Master's Degree (M.A.) Field: Industrial Management (Production Orientation) Summer 1990 Abstract With the current progress of industries, the return and reuse of used products is one of the activities of May.

Abstract: The aim of this research is to investigate the relationship between the sensitivity of asymmetric cash flow and cash retention in companies, with an emphasis on financial constraints. This research is a library and analytical-causal study and is based on panel data analysis. In this research, the financial information of 112 companies admitted to the Tehran Stock ...

Dissertation for obtaining a master's degree, specialization: accounting, abstract: several studies have proven that stock returns perform differently in different time horizons, short-term, medium-term, and long-term. Two important and widely used strategies among analysts, portfolio managers and other investors in the current capital markets of the world are the reverse ...

Dissertation for obtaining a master's degree in the field: Geography, specialization: rural planning, abstract of Pakdasht city, which is stretched from the south of the Alborz mountain range to the plain, and due to the presence of the Jajroud river and its fertile soil, it is a suitable environment for farmers, especially for growing flowers and plants. These factors, along ...

Master's Thesis in the field of Physical Education and Sports Sciences - Physiology. Abstract: Investigating the effect of four weeks of isometric handgrip exercise on changes in blood flow-related vascular dilation and blood pressure in women with hypertension. It seems that hypertension has a complex relationship with endothelial dysfunction. Increased blood pressure ...

An academic thesis for receiving a master's degree in chemical engineering, environmental orientation. Among the models that are able to make successful predictions for the performance of reverse osmosis membranes, that is, the amount of separation and flow flux in a wide range of physical conditions (membrane and solution) and laboratory conditions (pressure and concentration), ...

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 ...

Mechanical Engineering Master's Thesis - Energy Conversion One of the ways to reduce energy consumption for underwater devices is to reduce the drag on these devices. The nose of underwater objects is one of the most important parts of these objects in dealing with currents. By optimizing this part, the drag can be reduced by controlling the boundary layer of the fluid, by ...

Master's thesis in the field of mechanics, specialization: mechanical engineering - energy conversion. Abstract: One of the most important components of fluid transmission systems are control valves, which can be seen in different routes of oil and gas transmission pipelines, etc. In control valves, the most important issue is the property of the flow in order to achieve the ...

Master's Thesis in Accounting, Abstract The purpose of this research is to investigate the relationship between the components of quality costs and quality in the company. In this research, the traditional method was used to collect the quality costs and the PAF model was used to determine the components of the quality costs. Research hypotheses based on a statistical sample for ...

Dissertation for receiving a master's degree, specialization: accounting, research abstract: The purpose of this research is to investigate the final value of cash for investors and to examine the relationship between financial flexibility and capital structure, as well as the impact of flexibility on capital structure decisions. In this research, the information of 94 companies ...

Master's Thesis of Social Communication Sciences The abstract of the present research was compiled with the aim of representing foreign cultural values ??in the environmental advertisements of Tehran. In this research, we were looking for answers to these questions, whether the environmental advertising of Tehran presents and advertises foreign cultural values ??or not, and if ...

Master's Thesis, Geography, Geomorphology, Abstract: The wide plain of Khuzestan hosts important permanent rivers, the largest of which is the Karun River. The Karun watershed is one of the largest sub-basins of Iran and a part of the main watershed of the Persian Gulf and the Oman Sea. The Karun River, with a length of about 890 kilometers, consists of four main branches, named ...

Dissertation for Master's Degree in Business Administration Examining the relationship between dividends and stock returns has long been one of the most difficult challenges faced by financial economists. This is done by measuring the cumulative abnormal return. Especially in this study, we investigate the influencing factors on the accumulated abnormal return in periods when ...

To receive a master's degree in civil engineering - water Abstract: Relaxation ponds should be designed in such a way that they can depreciate the potential energy stored in the reservoir water of dams and dams in such a way as to transfer it to the natural bed so as not to cause the loss of the bed and in critical conditions to destroy the pond and dam itself. In different ...

Master's thesis in the field of civil engineering (environmental engineering) is an abstract of the surface absorption method, one of the effective methods for removing metals, including nickel metal. In this research, modified rice paddy has been used as absorbent material. Since this adsorbent is a natural material with a high contact surface, in addition to its high ability ...

Abstract: Hydraulic jump is one of the amazing hydraulic phenomena that consumes the kinetic energy of water. Hydraulic structures such as relaxation ponds mainly use this important property of hydraulic jump to consume energy downstream of overflows, rapids and valves. The dimensions of these structures are directly dependent on the characteristics of hydraulic jump, therefore, ...

Master's Thesis in Nano Chemical Engineering Abstract The aim of this study is to separate cationic polyacrylamide from the waste water of Prodeh Tabas coal washing plant using the polymer membrane filtration process. The primary membrane was prepared using polyacrylonitrile (PAN) by phase inversion process, and then they were prepared using hydrolysis as chemical modification ...

Chemical engineering master's thesis without preface today simulation in processes can be an important tool to solve problems in different industries. A new idea that should be done in the real world by trial and error with a lot of costs and risks can be simulated in the environment of a strong software and the results can be used. Simulation can also be used to check and ...

Master's thesis in the field of chemical nanoengineering Abstract: Fabrication of ceramic nanofiltration membrane for chloride ion separation (case study: gas condensate) In this research, chloride ion separation using alumina-titania double layer nanofiltration membrane has been investigated. For this purpose, first, the alumina-titania double-layer membrane is made based on ...

Master's thesis in the field of chemical nanoengineering, abstract modeling of chloride ion removal from gas condensate using nanofiltration of chloride ion in gas condensate can cause severe corrosion of equipment and pipes. Therefore, it is necessary to remove it from the condensate flow. The aim of this work is the mathematical modeling of the nanofiltration process for the ...

Dissertation for M.Sc. Degree: Food Industry Abstract: Pectinases are a group of hydrolytic enzymes that break down pectic substances. Exopolygalacturonase (exo-p) and endopolygalacturonase (endo-p) are two types of this group. In this study, two fungal species, namely Aspergillus niger and Vetrichodermarisi, which were able to produce pectinase, were isolated. The results of ...

Dissertation to receive a master's degree ""M.Sc"" in the field of electrical engineering, power systems trend Abstract Today, significant advances in semiconductor technology and the emergence of high-power switches that have the ability to be turned off by a control signal on the one hand and the better efficiency of multi-level converters compared to two-level converters on ...

Master's Thesis of Energy Conversion Mechanical Engineering Abstract In recent years, due to the importance of finding energy, global warming and environmental pollution and its production sources, and the growing need of various industries for various forms of energy, as well as the large volume of its consumers around the world, the need to provide models to optimize energy ...

Dissertation for Master's Degree Abstract Achieving higher rates of heat transfer using different techniques that can result in saving a significant amount of energy and also lead to the production of more compact and cheaper devices with higher thermal efficiency has attracted the attention of researchers. Vortex generation is one of the best methods used to increase heat ...

Dissertation to receive a master's degree in mechanical engineering in the field of construction and production. Abstract: The growth and expansion of cities and the development of urban life require up-to-date and expandable infrastructure. Transportation systems are among the basic infrastructures in cities, among which the creation and development of subway networks is of ...

Master's Thesis, Mechanical Engineering, Energy Conversion, Abstract In this thesis, using the CFD computational fluid dynamics technique, the effect of key parameters such as the effect of secondary inlet pressure on the ejector device, suction ratio, return currents caused by secondary inlet pressure and the effect of all these parameters on the hydrodynamic characteristics of ...

Master's Thesis in Mechanical Engineering (Energy Conversion) Abstract Numerical investigation of the effect of microstructures on heat transfer and fluid mixing in microchannels, the need for high heat transfer from electronic packages and optical systems, etc., has created a challenge in the field of thermal management. In this context, microchannel heat wells play a great ...

Master's Thesis in Accounting (MA) Abstract The purpose of this article is to investigate the relationship between investment sensitivity and cash flows with the level of capital expenditures. In this research, the financial information of 73 companies admitted to the Tehran Stock Exchange during the period from 1382 to 1391 has been examined (730 years - companies). 18SPSS ...

Accounting training group, academic thesis for obtaining a master's degree, abstract of the company's capital structure is the permanent financing of the company, which is shown by long-term debt and equity. Financing methods for the continuation of activity and the implementation of profitable projects are very effective in the growth process of the company and cause the ...

Dissertation for Master's Degree in Accounting Abstract In this research, the complementary role of operating cash flow in explaining the stock returns of companies admitted to the Tehran Stock Exchange has been investigated. The statistical sample of the research includes 98 companies during the period from 1387 to the end of 1392. In this research, to study the effect of each ...

Master's Thesis in Accounting (M.A) Abstract The explosive growth of the world's financial markets has created competition among investment institutions, and in order to achieve better investment results, investment institutions must make predictions about their decisions, including the most important issue raised in the field of financial management, assuring real and legal ...

Dissertation for Master's Degree (M.A) Field: Geography Major: Tourism Planning Flower and plant tourism is one of the special branches of tourism and day by day the number of this type of tourists is increasing in the modern world. Flower and plant tourism can be seen as visiting destinations where the primary motivation for traveling to those destinations is the interest in ...

Dissertation for receiving a master's degree in the field: accounting. Abstract One of the existing mechanisms in order to reduce the agency problem and reduce the information asymmetry between shareholders and managers in the capital markets is the corporate governance system. The role of institutional shareholders in corporate governance and their presence in companies has ...

Dissertation for Master's Degree in Accounting Abstract Accepted principles of accounting have a lot of flexibility in some methods, which potentially makes managers make accounting estimates based on their personal judgments. This flexibility may affect the reliability of accrual items and consequently the stability of these items in successive periods. The main goal of the ...

Dissertation for receiving master's degree in accounting, accounting orientation, the abstract of profit information content, has been widely tested in accounting and financial texts. Since in most cases, including financial reporting and evaluation models, profit plays a fundamental role, it is very important to determine the financial items and variables related to accounting ...

Thesis for obtaining a master's degree (M.A) in the field: Geography, tourism planning trend. Abstract Today, tourism and especially nature-based tourism (ecotourism) can play a significant role in the economic development and income generation of human societies, which is different according to the natural dependencies and native habitats of each country. According to its ...

Thesis for obtaining a master's degree in the field: business management-financial orientation. Abstract: The purpose of this research is to investigate the role of accruals in evaluating and forecasting cash flows of companies. This research is a library and analytical-causal study and is based on panel data analysis. In this research, the financial information of 103 companies ...

Dissertation for Master's Degree in Civil Engineering - Abstract Hydraulic structures in high dams of spillways, as one of the dependent hydraulic structures, have the important role of discharging the incoming floods into the dam reservoir with sufficient safety in free flow or under pressure downstream. In tunnel overflows where the flow is at a high speed and often under ...

The first chapter of research overview 1- Introduction The growth and development of joint-stock companies over time led to the emergence and increase of a class of capital owners who did not directly participate in the management of the companies and guided and monitored the company's affairs through the selection of the board of directors. This new development created a new ...

Master's Thesis in Civil Engineering (Soil and Foundation) Abstract Dense sand piles have been used since 1950 in Japan and then in other countries of the world as one of the most effective and economical methods in strengthening soil in order to prevent liquefaction, increase bearing capacity and improve soils with different grain sizes. The process of implementing dense sand ...

Dissertation to receive Ph.D. Persian Summary Otostegia persica is one of the Lamiaceae (mint) plants, which in traditional medicine is used to treat malaria, reduce blood sugar and blood pressure, and relieve S fever. The name of this plant in Persian culture is ""golder"". This genus has 3 species of perennial herbaceous plants in Iran: Otostegia aucheri, Otostegia micchauxii, ...

Dissertation for Master's Degree Abstract The general purpose of this research is to investigate the effect of low-intensity resistance training with restricted blood flow on the serum levels of growth hormone, cortisol, testosterone and IGF-1 in young men. 30 healthy young men with an age range of 19-24 years who volunteered to participate in the study were selected as a ...

Doctoral thesis in the field of chemical engineering. Abstract The study of the effective parameters in the synthesis of silver nanoparticles by the inverse microemulsion method of metallic silver nanoparticles is of interest due to their use as catalysts, antimicrobial agents and biosensors. The practical use of silver nanoparticles is highly dependent on the size distribution ...

Master's Thesis of Chemical Engineering-Biotechnology Abstract The deteriorating energy sources of fossil fuels will make the developing human society suffer from fuel shortage in the not too distant future. As a result, the concerns of the continuous and increasing release of carbon dioxide into the atmosphere, as well as the extent of pollution caused by fossil fuels that have ...

Dissertation for receiving a master's degree major: Accounting Abstract: The main purpose of this research is to investigate the effect of audit quality on the relationship between free cash flow and profit management in companies listed on the Tehran Stock Exchange. In other words, in this research, an attempt has been made to answer the question whether the high quality of ...

Dissertation for M.Sc degree in food science and industry Abstract Oils and fats are oxidized during storage at high temperatures and their nutritional quality decreases. The process of oxidation of oils and fats and the formation of free radicals causes the development and development of cancer. These damages can be prevented by consuming antioxidant compounds found in fruits ...

Master's thesis in the field of mechanical engineering - energy conversion trend Abstract: In this research, the turbulent flow of a non-Newtonian nanofluid in a microchannel with a circular cross-section is simulated. First, the types of classification of microchannels, the methods of making microchannels, as well as the advantages and challenges of using microchannels are ...

Dissertation for M.Sc Mechanical Engineering - Energy Conversion Orientation Abstract: In this research, the turbulent flow of a non-Newtonian nanofluid in a microchannel with a circular cross-section is simulated. First, the types of classification of microchannels, the methods of making microchannels, as well as the advantages and challenges of using microchannels are stated. ...

Dissertation for M.Sc. in Food Engineering, Agricultural Orientation Abstract The focus of recent research has been photochemical substances derived from plants, which are due to their positive effects on human health. During processing in factories, food can be enriched with active compounds such as phenolic compounds that have benefits and physiological properties such as ...

Dissertation for Master's Degree (M.Sc.) Field: Horticulture-Ornamental Plants Abstract To investigate the effect of gap and silver nanoparticles on the life of the flower and the hyphae characteristics of Alstroemeria hybrida cut flowers, a 2-factor factorial experiment based on a completely randomized design with two factors of stem end gap in 2 levels (5 cm gap and no gap) ...

Field of study: Mechanics, orientation: energy conversion. The present research was conducted in order to investigate the movement of pig in pipelines. Due to the importance of pipelines in providing energy resources in the world, after installation and operation, the maintenance of these lines is of high importance, which has caused special attention to be paid to the design of ...

Master's thesis in the field of agricultural engineering - horticultural sciences, specialization: ornamental plants. Abstract In order to investigate the effect of sodium nitroprusside on the flowering life of rose, sunflower and lisianthus cut flowers, a study was conducted in the form of a factorial experiment based on a completely randomized design with two sodium ...

Dissertation for Master's Degree (M.Sc) Field: Horticulture Major: Ornamental Plants Abstract In order to investigate the effect of different waters on the life after harvesting of rose, chrysanthemum and gerbera cut flowers, a factorial experiment was carried out in the form of a completely randomized design in 3 replications with two factors: types of water (magnetic water, ...

Department: Plant Products Master's Thesis in Plant Products-Horticulture Abstract Rose (Rosa hybrida) is considered one of the most popular flowers in the world and its cut flower branch is the most used among other flowers. Due to the physiological reasons of being a rose cut flower, during its shelf life, it is highly susceptible to withering and reducing its freshness and ...

Master's Thesis in Mechanical Engineering, Applied Design 1-1-Introduction All humans know that the heart is a vital organ in the human body, so we cannot live without it. But with a purely mechanical view, the heart is just a pump; A very complex and important pump; And in terms of being a pump, like all pumps, there is a possibility of clogging, failure or needing to be ...

Master's thesis in the field of mechanical engineering - energy conversion trend. Abstract Numerical simulation of a flow measurement microsensor in a real human aorta model. Arterial diseases, especially arteriosclerosis and vasodilation, are among the most important causes of sudden death in the world. There are different methods for diagnosing these diseases, and in this ...

Dissertation for the M.Sc. Field of agriculture, the effect of water stress, zeolite and salicylic acid foliar spraying on some agronomic and physiological traits of spring safflower 1: General: 1-1: Introduction: Environmental stresses are the most important factors that reduce the yield of agricultural products in the world. If environmental stresses did not occur, the actual ...

Dissertation for receiving a master's degree in the field: Food Science and Industry Abstract: In addition to changing the organoleptic characteristics of the food, the oxidation of oils reduces the nutritional value and shelf life of oils and has a negative effect on the health of consumers due to the production of undesirable compounds in the oil. There are many ways to ...

Dissertation for obtaining a master's degree in the field: horticulture, ornamental plants. Abstract This study was conducted in order to investigate the effect of nickel on the life after harvesting of gerbera flower in the form of a completely randomized design with three replications. Healthy gerbera flowers (Gerbera jamesonii cv. 'Intense') were purchased from a commercial ...

Abstract: Research in the field of heat transfer of suspensions with nanometer-sized solid particles in the base fluid has started in the last decade. Recent research in the field of nanofluids has shown that the addition of nanoparticles causes a significant increase in the heat transfer of the suspension. Another common way to improve the thermal performance of devices is to ...

Thesis for receiving a master's degree in the field of mechanics, energy conversion, abstract: free or natural convection heat transfer is one of the most useful phenomena in industry and in the environment around humanity. Due to its wide application, this phenomenon has attracted the attention of many researchers and has prompted researchers to follow the flow of free movement ...

Dissertation for Master's Degree in Mechanical Engineering (Energy Conversion) Abstract In this thesis, the mass and heat transfer of water-aluminum oxide nanofluid in a two-dimensional porous medium under a magnetic field and in the vicinity of a vertical wall has been investigated. The boundary wall can be permeable or impermeable. The concentration and temperature of the wall ...

Abstract This study was conducted to determine the effect of different levels of vitamin E and C on growth indices and blood parameters in flowerhorn fish (Cichlosoma sp). 9 diets containing a combination of 0, 100 and 1000 mg/kg of food of vitamin E and 0, 100 and 1000 mg/kg of food of vitamin C were considered in three replicates for 8 weeks. The initial weight of the fry was ...

Dissertation for Master's Degree in Food Science and Technology, Food Technology, Abstract: In addition to changing the organoleptic characteristics of food, oxidation of oils reduces the nutritional value and shelf life of oils and is harmful to the health of consumers due to the production of undesirable compounds in oil. To prevent oxidation, there are several methods, one of ...

To obtain a master's degree in mechanical engineering - manufacturing and production Abstract Fuel cells are electrochemical devices that are used to directly convert fuel into electrical energy. One of the most important types of fuel cells is the polymer fuel cell, which is widely used. In general, two types of optimization can be done in the polymer fuel cell: optimization in ...

Master's Thesis, Energy Conversion Engineering, Abstract: In many processes in the industry, the combination of liquid droplets with gas flow will lead to problems such as corrosion of downstream equipment and loss of expensive liquids. To solve these problems, the phases are separated from each other with the help of a separator. Cyclone separators, as a type of high efficiency ...

Master's Thesis in Mechanical Engineering - Energy Conversion Abstract The vortex tube is a simple mechanical device that has no moving parts and is one of the equipment used in the refrigeration system, in which a high-pressure fluid enters the vortex tube through the inlet nozzles and splits into two streams with a lower and higher temperature than the inlet temperature, thus ...

Master's Thesis in the field of Mechanical Engineering - Energy Conversion Abstract Numerical investigation of fluid flow and heat transfer on mesh plates with cross holes under discontinuous suction Introduction 1-1- Fluid flow on mesh plates The urgent need of modern humans to use different fuels and the problem of environmental pollution caused by improper and indiscriminate ...

Thesis - Master's Degree in Geophysics - Winter Seismology 2012 Abstract In this research, the effect of a branch fault in a subduction zone on tsunami waves using numerical modeling of tsunami waves.

Doctoral Dissertation in Civil Engineering - Summer 2013 Earthquake Abstract One of the appropriate tools to know the condition of the network­ As one of the vital artery systems, water distribution is an indicator of reliability. one hand

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

Master's Thesis in Civil Engineering - Earthquake Engineering 1391 Abstract Structures with frames with coaxial braces are among earthquake resistant systems. These structures are widely

Dissertation for obtaining a master's degree in civil engineering, structural orientation, March 2013, abstract of the scope of using FRP materials for shear strengthening of reinforced concrete beams in

Department of Industrial Management Winter 2019 Abstract: The current research is about the mutual effect of supply chain management and customer relationship management in Esfrain Steel Company. In order to answer the research questions

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.

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

end‌name? Rasht Master's Degree: Civil Engineering (M.S.C.) Focus: Hydraulic Structures Academic Year 2011-2012 Summary of the Minab River, the most important river of Khan? The fresh water is in Hormozgan province. this river

Master's Thesis in Geophysics – Seismology 2019 introduction of spectral acceleration maps by probabilistic method for Iran in the range of 44-54 geographic longitude and 40-26-5 geographical latitude based on the analysis

Dissertation for obtaining a master's degree in civil engineering – Spring 2014 structure trend, first chapter, general research 1-1- Introduction: Mostly structures for severe earthquakes and surface acceptance