Showing 207 results for صرف
Volume 15, Issue 5 (7-2015)
Abstract
Biodiesel is a renewable and sustainable alternative fuel that is derived from vegetable oils and animal fats. In this paper an experimental investigation is conducted to evaluate the use of soybean oil methyl ester (biodiesel) in the diesel fuel at blend ratios of B0, B2, B5 and B10. In this study, the performance and emissions characteristics of conventional diesel fuel and biodiesel fuel blends were compared. The tests were performed at steady-state conditions in a direct injection diesel engine with 90 kW power that was equipped with EGR and with no modification of calibration. The experimental results of brake-specific fuel consumption (BSFC), torque and exhaust temperature as well as carbon dioxide (CO2), smoke, nitrogen oxide (NOx), carbon monoxide (CO) and unburned hydrocarbon (UHC) emissions were presented and discussed. The results of engine performance parameters at different conditions (different load and engine speed) showed that a negligible loss of engine power and a significant increase in brake specific fuel consumption due to lower heating value of biodiesel. Smoke, CO and HC emissions were decreased by increasing blends of soybean oil as compared to pure diesel. However the increase in engine NOx and CO2 emissions were observed with the increase of biodiesel percentage in the blended fuel.
Volume 15, Issue 6 (8-2015)
Abstract
In all societies and countries, in order to plan to provide the required energy for various sectors, it is necessary to accurately predict the demand, type of energy carriers and energy supply method. Considering the importance of food industries in each country, in this study, modeling of required energy for food industries sector was investigated. Modeling of energy consumption was performed using artificial neural networks. In the first step, the input data to the model was calculated according to statistics, balance sheets and input method proposed in this paper. Two methods, namely multiple neural network and single neural network were tested and the results showed that multiple neural network has a higher accuracy. For each of the energy carriers (gasoline, kerosene, fuel oil, natural gas, electricity, gasoline and LPG) the best neural network was selected by taking the average of 20 times per program for each network characteristic. Finally, the network was implemented in the form of final model using Simulink environment of MATLAB 7.0 software. Data analysis showed that daily consumption of natural gas in the industry is increasing, while the consumption of fuel oil and LPG is going to be decreased.
Volume 15, Issue 6 (3-2024)
Abstract
All languages in the world use different mechanisms to create new words. compounding is a morphological process whose main function is the formation of new word-forms. In Persian, compounding is the most productive morphological process. One of the compound words is numeral ones; a numeral in the broadest sense is a word or phrase that describes a numerical quantity. The main purpose of this research is to study the compound numeral construction [Num X] in Persian within the framework of Construction Morphology (CM) to investigate its semantic variations, the most general schema and subschemas. The data analyzed in this study has been gathered from six sources: Reverse Dictionary (Zansu) (Keshani, 1993), Persian Linguistic Database (PLDB), FarsNet, Farhang-e Bozorg-e Sokhan (Anvari, 2002), Google and Persian Wikipedia. The findings of the research show that [Num X] has different meanings (functions) and thus we can consider it as a polysemous construct. Its polysemy is not explainable at the level of words, but at the level of abstract schemas; hence, it is called ‘constructional/ logical polysemy’. The results of this study indicate that ‘distinctive property of an entity related to SEM Number and X” is the prototypical meaning of [Num X] which is the most abstract correlation among meaning and form in Persian language.
1. Introduction
Traditionally, word formation consists of two processes: derivation and compounding (Booij, 2007, p.24). Greenberg (1963, p.92) says: "it is probable that no language exists without compounding, derivation, or both. A significant number of languages exist without inflection, but without compounding or derivation, probably not." Given this level of productivity, this process holds a special place in the morphology of every language and has garnered considerable attention from grammarians and linguists.
Numerous studies have addressed compounding in the Persian language, but numeral compounds have not received much attention. In this study, by examining these compounds and providing schemas and sub-schemas for Persian numeral compounds, and analyzing them within the framework of Construction Morphology, we will map the hierarchical relationship of schemas and sub-schemas of numeral compound constructions [Num X]. This will help us to derive a potential model for classifying these constructions within the mental lexicon of Persian speakers.
Research Question(s)
The main question of the present study is how, based on the theory of Construction Morphology (Booij, 2010), can we consider the numeral compounds as constructions and analyze the semantic variations in the constructions?
2. Literature Review
The theoretical framework of this study follows Construction Morphology (CM) (Booij 2010).
The aim of the theory is a better understanding of the grammar of words, as well as the relation between syntax, morphology, and the lexicon. In the framework the notion ‘construction’, a pairing of form and meaning, as developed in the theory of Construction Grammar, is essential for an insightful account of the properties of complex words. Morphological patterns can be represented as constructional schemas that express generalizations about sets of existing complex words and word forms, and provide the recipes for coining new (forms of) words.
One of the issues discussed in this theory is compounding. According to Booij's definition (2007, p.75) compound word is as a combination of two or more words. He divided compounds in to five kinds and argued that some compounds what have been called exocentric compounds or bahuvrihi compounds are a specific semantic category of endocentric compounds based on metonymic language use. One category of compounds is numerical compounds, which are combinations of a number and a noun. These compounds are also metonymical endocentric compounds and refer to someone or something characterized by a specific and prominent feature. The present study follows the numeral compound construction; that is [Num X], in the framework of Construction Morphology to investigate its semantic variations, the most general schema and subschemas.
3. Methodology
In this study, we analyzed the nonverbal adjectival compound constructions, following the construction [Num X] in Persian and illustrated the schemas and sub-schemas of the constructions. In all the data of this research, numbers function as adjectives and are used for an entity description. The data for this research were extracted from the following sources: Reverse Dictionary (Zansu) (Keshani, 1993), Persian Linguistic Database (PLDB), FarsNet, Farhang-e Bozorg-e Sokhan (Anvari, 2002), Google and Persian Wikipedia. Since numbers are infinite, constructions formed with numbers are also potentially infinite. For example, the word "seven hundred" in the compound ‘seven hundred-legged’, although it may not exist in the real world, can be constructed based on the infinite nature of numbers and a schematic perspective.
4. Result
The present study aimed to examine the semantic variations of the nonverbal adjectival compound constructions to determine the general constructional schema and sub-schemas governing the [[Num] [X]] construction within the framework of construction morphology. The issue observed after the semantic classification of the compounds was the semantic variations, particularly in numerals constructed with the numbers "one" and "two." Analyses showed that the numbers "one" and "two" in some numeral compounds do not appear with their literal meaning (mathematical number), but rather acquire a metonymical meaning. These two numbers, appearing with a metonymic meaning in combinations with the meaning of the constituent X (which in some cases is conceptualized metaphorically) and the construction, resulting in a new meaning formed by the [[Num] [X]] construction.
It was also noted that this semantic variation and metaphorical and metonymic mechanisms are not present in numbers larger than "two." However, all compounds constructed with numbers share two concepts: "attribute" and "possession." Given that all countable nouns can be enumerated with the number one and other counted numbers and distinguished from each other, the [[number] [X]] construction is productive and potentially infinite.
Furthermore, it was determined that semantic variations and the formation of numeral compounds constructed with the numbers "one" and "two" can be attributed to a polysemic approach at the level of abstract schemas. Additionally, it was revealed that there is a general constructional schema and five sub-schemas for adjectival compounds with the number "one" and a general constructional schema and two sub-schemas for the number "two," corresponding to the construction [[one] [X]] and [[two] [X]]. Moreover, the primary concept of " distinctive property of an entity related to SEM Number and X” is the prototypical meaning derivable from the [[Num [X]] constructions. Finally, the findings of this study indicated that the main function of this construction is to distinguish one entity from another related to the meaning of the number and X.
Volume 15, Issue 8 (10-2015)
Abstract
Considering the determinant role of glazing systems in energy consumption, it is imperative to survey the thermal performance of double coated glazing systems in accordance with the harsh climatic conditions and available local and foreign products' situation. In this paper, the radiative properties of local coated and non-coated glazing units are measured by the spectrophotometer and emissometer apparatus. These thermal and solar properties were not available in any datasheet. In the second step, through the accurate calculation method of EnergyPlus software, the amount of energy loss due to the radiative properties of glazing units was simulated in two extreme climates (very hot and humid climate and cold climate). By choosing the simulation method instead of real measurements in this step, it became possible to evaluate the effect of different parameters (such as climate, orientation and glazing specification) on the annual energy loss through the glazing units by eliminating other factors like energy transfer through opaque surfaces and ventilation. The simulation results indicate that using double glazing unit with low-E coating on the third surface (from the exterior) of the double glazing, significantly reduces energy consumption of the glass unit (up to 97 percent) for all orientations in the cold climate. In hot climates like Bandarabbas, using reflective coatings (with dark blue color) in double glazing units is the best possible alternative since it lessens the energy transfer through the glass unit (up to 70 percent) compared to the clear double glazed ones.
Volume 15, Issue 76 (0-0)
Abstract
Volume 15, Issue 81 (11-2018)
Abstract
Volume 16, Issue 1 (3-2016)
Abstract
In this study, a numerical method is used to investigate the effects convergence primary nozzle on the air ejector performance used in Polymer Electrolyte Membrane Fuel Cell (PEMFC). Simulations have been performed by solving the compressible form of two-dimensional Navier–Stokes equations. The turbulence model have been employed to estimate the turbulent region. A comparison of the computed results with the published experimental data exhibits agreement in terms of entrainment ratio at defined operating conditions. The ejector with convergence nozzle was widely used in the aerospace science, jet engine and Polymer Electrolyte Membrane Fuel Cell, because it has many advantages such as jet noise reduction, prevent condensation of water vapor inside the ejector and improvement of conventional converging-diverging nozzle. According to several applications and advantages of convergence nozzle, effects of primary converging nozzle on the flow characterization and the ejector performance have studied at any part of its. Based on particular application of the ejector with convergence primary nozzle in PEMFC, performance improvement is the purpose of this study. The results have been compared with air ejector with convergence-divergence primary nozzle. The results show that the air ejector performance has been enhanced under changing primary nozzle structure. This means that the ejector can consume available energy in its operation processes optimally beside increasing drawn secondary flow.
Volume 16, Issue 1 (3-2016)
Abstract
In this article, indicators of annual energy intensity 13 residential complexes with different characteristics were evaluated and compared. These features include the type of facade, heating and cooling systems, windows, and separate or shared type gas meters are units available in the complex. Introducing selected complexes, specifications hull, heating and cooling systems as well as the energy used in the study and analysis of energy flows in the complex have been discussed. The data processing methodology for calculating the energy consumption rate index have been studied conglomerate. The indices are calculated energy intensity of buildings and structures with different properties in terms of energy intensity compared. Compare energy intensity indicators show that the use of new energy Mtalh like metal siding board (decorative panels) instead facade, windows UPVC windows instead of metal, instead of single-wall and double glass instead of heaters and boilers as well as the use of semi-centralized heating systems or room in the building's energy intensity has considerably decreased. Also, instead of using a separate gas meter gas meter joint, by influencing the behavior of the occupants of the building and create a financial incentive to reduce energy use saves natural gas consumption and decreasing energy intensity building.
Volume 16, Issue 1 (3-2016)
Abstract
Azo dyes constitute the largest class of dyes and contains one or various azo groups conjugated with aromatic systems such as acid azo dyes which have sulfonic groups causing strong attachment to the cationic groups of fibers. The characteristics of these materials are high color intensity and visibility in very low concentrations, complex chemical structures, and light resistance and hard to biodegradability, variability in pH range and above of these they have high carcinogenic and mutagenic potential. Generally, the physical, chemical and biological methods are considered as textile wastewater treatment techniques such as electrocoagulation, absorption, advanced oxidation, Fenton, photo-Fenton, photoelectrochemical and photoelectrocatalytic. Electro-Fenton is an indirect oxidation process and is based on in situ electrochemical generation of peroxide hydrogen due to electrochemical reduction of dissolved oxygen next to graphite cathode. In this process hydroxide radicals are generated by reaction of hydrogen peroxide and iron ions in acidic condition. Hydroxide radicals are the most powerful radicals with high oxidation potential lead to degrade organic matters into simple compounds like water and carbon dioxide. Recently carbonic material like carbon felt, graphite, activated carbon fibers, carbon nanotubes, carbonic sponge and graphite-PTFE are used to improve electro-Fenton process. Enhancement of surface area, reaction rate and electron transfer are the main reasons which Carbon nanotubes are used to improve electrochemical production of hydrogen peroxide in electro-Fenton process. Dye removal increased at initial reaction time by increasing current intensity, aeration rate and electrode surface due to enhancing electro-Fenton regents, meanwhile it decreased with increasing pH and electrolyte concentration. Reduction in dye degradation is usually caused by scavenging role of hydrogen peroxide and iron ions due to reaction of these compounds with hydroxyl radicals which decreased its concentration in reactor. Dye degradation increase by enhancement of Initial dye concentration from 35 to 100 mg/L but when initial dye concentration increased further to 200 mg/L, degradation rate was reduced. On the other hand energy consumption reduced by decreasing current intensity from 2 to 1 mA/cm2 and enhancing electrode surface from 30 to 90 cm2. It has been shown that carbon nanotubes coated on graphite cathode could enhance dye removal rate by increasing hydrogen peroxide concentration due to increase electrode surface area, electron transfer and reaction rate. The results showed that dye and COD removal efficiency was obtained 98% and 95% after 180 and 360 minutes respectively at the optimal condition of effective parameters such as current density of 1 mA/cm2, pH of 6.5, no aeration, initial dye concentration of 100 mg/L, electrode surface of 90 cm2, electrolyte concentration of 0.01 M, temperature of 25 ◦C and energy consumption of 0.13 KWh/ppm. Electro-Fenton process seems to be an economic and environmental friendly process to remove the toxicity of the persistent organic pollutants from water due to generation of hydrogen peroxide and hydroxyl radicals. It has been demonstrated that electro-Fenton process with the use of stainless steel anode and graphite cathode coated with carbon nanotube is a very effective and operative method to degrade Acid Orange 7.
Volume 16, Issue 1 (5-2016)
Abstract
In urban and regional economics’ literature, according to the concepts of new economic geography model (NEG) and endogenous growth model, spatial agglomeration of economic activities and economic growth are interrelated processes. In the endogenous growth models, how to create new economic activities through innovation is checked. Moreover, the NEG model aims to investigate how to establish these new economic activities, and cause of their concentration. Therefore, innovation, location and growth are interconnected processes within the NEG model. This article examines theoretically and experimentally the effects of economies of industrial agglomeration on economic growth in Iran’s provinces. In theoretical section, a NEG model has been presented. It shows that the agglomeration of industrial activity affects the economic growth. In the experimental section, a model has been estimated by applying Generalized Method of Moments (GMM) using provincial data during 2000-2009. The results indicate the positive and significant impact of industrial agglomeration on economic growth in provincial level in Iran. Also, the amount of industrial agglomeration has been calculated by Maurel-Sedillot index within the 2-digit ISIC codes, which shows that the other transport equipment industry (code -35) has the largest agglomeration, and printing and publishing industry (Code -22) has the smallest agglomeration.
Volume 16, Issue 1 (5-2016)
Abstract
Understanding the nature of the causal relationship among economic variables is crucial for the economic policy-makers and planners. So, this study investigates Granger causality between producer price index (PPI) and consumer price index (CPI) for the economy of Iran. From a policy-making point of view, the findings of the study may inform economic policy-makers in pursuing effective anti-inflationary policies. To this end, monthly data are used over the period 1990- 2011. The results of the cointegration test indicate that there is a long-run equilibrium relationship between these variables. According to Hsiao test, there is bi-directional causality between consumer price index (CPI) and producer price index (PPI) in both short-run and long-run. Toda and Yamamoto test also indicate the bi-directional causal relationship between the variables. However, it seems that causality from PPI to CPI is stronger than that from CPI to PPI, supporting the Cushing and McGarvey (1990) hypothesis.
Volume 16, Issue 2 (8-2016)
Abstract
One of the major problems in budgeting is to predict the various kinds of future income precisely as possible. Since tax revenue is very important component in the combination of state income, the present paper considers the forecasting of VAT on gasoline consumption. The main purpose is to achieve an efficient method to forecast gasoline consumption and VAT on it in Iran. Hence, a Hybrid ARIMA- Neural Network model is used to forecast gasoline consumption. After confirming the good performance of this method compared with autoregressive integrated moving average processes(ARIMA), VAT on gasoline consumption is calculated by applying its tax rate. Results indicate that during the years 2013 to 2016, VAT on gasoline consumption will grow by 31.6 percent on average.
Volume 16, Issue 2 (5-2025)
Abstract
Employing Construction Morphology (CM), the present study aims to examine the Persian compound words, ending in the verb stem “bast”. The data is comprised of 51 compound words and 1791 attested sentences. The latter body of data comes from various reliable sources, including the diachronic corpus of Farhangyar-e Zaban-e Farsi, the synchronic corpus of Persian Language Database, Bijankhan Corpus, Iranian Geographical Dictionary, Zansou Dictionary (1372), Dehkhoda Dictionary (1377), Persian Wikipedia webpage, and Google webpages. The findings suggest that semantic variations of these compounds figure in the concepts of Action, Location, and Instrument. Accordingly, the dominating schema and sub-schemas of theses words, and their relations are described. The study also suggests that approximation- along with metaphoric and metonymic extensions- has a role in the expansion of the schema.
1. Introduction
Compounding is recognized as one of the most productive word formation processes in many languages (Haspelmath, 2002). Likewise, in Persian, compounding refers to a predominant morphological process. This study analyzes the compounding structure represented through the underlying conceptual construction [X-past stem of the verb]. In this construction, a nonverbal element is combined with an adjective, a verb, or a noun, producing compound words such as 'darbast,' 'pishkharid,' 'salkhord,' 'adamizad,' 'dastpokht,' and 'rahavard.' In Persian morphology, the schematic construction [x-bast] has appeared to be one of the most productive constructions. This construction allows for the categorical distinctions and semantic variations of the compound words based on [x-bast] structure.
Research Question(s)
The present study addresses the following research questions:
1. What semantic variations can be observed in the Persian compound words ending in past verbal stem [bast]?
2. What schematic construction underlies the [x-bast] structure?
2. Literature Review
There is a vast body of scholarly work in the literature addressing word formation processes in Persian. What is more, a massive body of literature that is concerned with the formation of the structure of compound words in Persian, including Kalbasi (1992), Asii (1992), Maghrebi (1993), Dabir Moghadam (1997), Mahoutian (1999), Sadeghi (2004), Tabatabai (2002, 2003, 2006, 2007), Khabaz (2007), and Shaghaghi (2007). However, only scant attention has been directed toward the study of semantic variations and schema of compound words in Persian including, Imani et al. (2017), Imani and Rafiei (2018), Azimdokht et al. (2017), Azimdokht and Rafiei, (2018), and Azimdokht (2018).
3. Methodology
This research is designed based on a descriptive-analytical approach. The analyses are carried out using both diachronic and synchronic corpora. Following the collection and categorization of data, we examined the semantic variations and the cognitive mechanisms underlying these variations. Ultimately, we presented the schematic structure [X-past stem of the verb “bast”] In so doing, we utilized Constructional Morphology (Booij, 2010) and the variation continuum (Heine et.al., 1991), as our theoretical and analytical frameworks to analyze the data and examine the semantic structures along with their variations. The dataset for this study is comprised of compound words ending in the past stem “bast”. We collected the data from various resources including the Farhangyar Persian language corpus, the Persian language database, the Bijan-Khan corpus, the Iranian Geographical Dictionary, the Zansou Dictionary (1993), the Dehkhoda Dictionary (1998), and the Persian Wikipedia webpage. Additionally, the Google search engine was employed to identify neologisms resulting from the [x-stem “bast”] construction."
4. Results
The analysis of 51 compound words ending in the stem 'bast' and 1,791 attested sentences reveals that the semantic variations of words within this morphological pattern reveal in terms of action nouns, locative nouns, and instrumental nouns. Interestingly, the formation of these semantic variations is mainly triggered through metaphorical extensions. Furthermore, employing Booij's (2010) polysemy framework alongside the variation continuum (Heine et.al., 1991), the study suggested that ‘ACTION’ serves as the primary underlying meaning associated with this construction, encompassing both spatial and instrumental dimensions. Subsequently, this conceptual meaning facilitates the emergence of other branches of the construction. The schemas and sub-schemas related to this construction indicate that the process of approximation in forming sub-schemas and the extension of this construction have been effective in the use of new compound words
Volume 16, Issue 3 (5-2016)
Abstract
In this paper a combined cooling heating and power system for using heat losses in PEM fuel cell has been proposed, present system can use for residential application. This system consists of PEM fuel cell, Heat storage tank, absorption chiller, hydrogen tank, air compressor and pump. Heat generated in fuel cell has been absorbed by a working fluid and a part of heat has been given to absorption chiller and another part has been given to heat storage tank. Modeling of this system has been done from four energy, exergy, FESR and CDER perspective. Fuel cell of this CCHP system generates 38.63 kW electrical power and 39.17 kW heat power. Energy efficiency of fuel cell singly is 37.21% but when heat storage tank and absorption chiller has been used for recovering waste heat, energy efficiency reaches to 68%. Maximum irreversibility loss occurs in fuel cell which is calculated 47.21 kW and absorption chiller irreversibility has been calculated 5.94 kW. From viewpoint of FESR and CDER in comparison with conventional systems, FESR and CDER are 34% and 25% respectively. Also analyzes had been showed that with increasing fuel cell operating pressure energy and exergy efficiency increased and by increasing high pressure of chiller COP decreased
Volume 16, Issue 3 (11-2016)
Abstract
The main purpose of this study is to examine the household’s behavior in response to the kinds of the wealth and the estimation of marginal propensity to consume out of wealth. By using Ando-Modigliani consumption model and applying Engle-Granger co-integration strategy, marginal propensity to consume out of wealth is estimated in Iran during 1982-2008. The various forms of wealth as durable good, housing, bonds, savings, combinative and normal good are considered. Results show that households respond to kinds of wealth differently. This study finds that the marginal propensities to consume (MPCs) out of labor income and wealth, in the form of durable good, are 0.93 and 0.012, respectively. In addition, the MPCs out of labor income and wealth in the form of housing are 0.8 and 0.027, respectively. Regarding bonds as wealth, the corresponding MPCs are 0.67 and 0.055, respectively. For savings, the corresponding MPCs are 0.58 and 0.081, respectively. In combinative form of wealth, the computed MPCs are 0.7 and 0.04, respectively. Finally, considering normal goods as wealth, this study reaches the MPCs of orders 0.59 and 0.16, respectively. The long-run relationship shows that individuals’ MPC is about 0.79 apart from what types of wealth they hold. One important finding is liquidity allocation by individuals facing various kinds of wealth. This study indicates the fastest velocity of liquidation of savings and the lowest velocity of liquidation of durable goods.
Volume 16, Issue 4 (12-2012)
Abstract
Protection of the consumer of goods has long been considered in the legal systems but with the development of multiple technologies and specialized and complex production processes, the need for consumer protection is felt more than ever. Preventive and remedial supportive techniques are used in the field of consumer protection as the weaker party. The liability of manufacturers of defective and dangerous product is supported in the Articles 2 and 18 of the Consumer Protection Act, enacted on 22/3/1388 and the EU Product Liability Directive, enacted on 1985/25/5 (85/734/EECL). Principles of the civil liability of suppliers of goods and services against consumer in order to support Cortex-informed in the legal relations have been attended. The accepted principles are Doctrine of Gaveat Emptor (let the buyer), warranty and strict liability. In this article-as a basis for civil liability in respect of supplier and consumer - strict liability is accepted
Volume 16, Issue 4 (6-2016)
Abstract
Wet cooling towers have a high cooling capacity. However, owing to consumption of large water quantities in wet cooling towers, using them in arid regions facing water resource crisis might cause operational problems. In this research, changing the wet cooling tower of unit 5 of Isfahan Islamabad power plant into a hybrid cooling tower, using parallel path wet/dry configuration is studied. The hybrid cooling tower with the recommended configuration causes minimal changes in the other power plant facilities and has a low construction cost. Two different airflow control systems are investigated for the wet and hybrid cooling towers. In the first system, the amount of airflow rate in the cooling tower is adjusted by means of switching tower ID fans on or off. In the second system, an optimum airflow control mechanism with high-tech fans is devised. The results reveal that the optimum airflow control system is more suitable than the other system, due to less water consumption, preventing the sudden fluctuations of airflow and consequently water consumption rates and less fan power consumption. Experimental data and results obtained by the HTFS software are used for validating the simulated results of the wet cooling tower and air-cooled heat exchangers, respectively. The results demonstrate that the annual amount of water conservation due to changing the wet cooling tower into hybrid tower is approximately 343830 and 348718 cubic meters for fan switching and optimum airflow control systems, respectively.
Volume 16, Issue 12 (2-2017)
Abstract
The present study was undertaken to design and analyze three different configurations of SOFC (solid oxide fuel cell) and MGT (micro-gas turbine) hybrid system. The first presented configuration is a hybrid system with one fuel cell which considered as a basic mode. Two other configurations are considered with two fuel cells that mounted upstream of the turbine in series and parallel forms. The aim of the current study was thermodynamic analyze of designed hybrid systems and achieving the optimum fuel consumption factor for fuel cells that used in hybrid systems. Therefore, other performance parameters such as turbine inlet temperature, compressor pressure ratio and the number of cells, which play an important role in implementation of SOFC and gas-turbine, were parametrically analyzed and the obtained optimum values were used in analyzes. In this regard, the parameters associated with electrochemical processes within cells considered as a function of their chemical and thermodynamic conditions, and their modeling code combined with the modeling code of micro gas turbine cycle. The results of this study revealed that fuel utilization factor has direct impact on the SOFC/MGT hybrid system performance. Also we demonstrate that the optimal fuel utilization factor for basic mode hybrid system was 0.85, hybrid system with 2 series fuel cells were obtained 0.7 and 0.8 respectively and hybrid system with two parallel fuel cells were calculated to be 0.85. Moreover, the SOFC/MGT hybrid system with two series fuel cells account for the highest electrical efficiency and was selected as the most efficient configuration.
Volume 16, Issue 90 (8-2019)
Abstract
Despite the high nutritional value of shrimp, its per capita consumption in the country is low. Therefore, it is necessary to investigate the reasons for this shortage and to propose ways to increase per capita consumption in order to maintain the health of the population. To this purpose, the behavior of shrimp consumers must first be evaluated. This study was conducted to evaluate the behavior of shrimp consumers in the country by using the general framework of the theory of planned behavior. The statistical population of the study was the whole country which selected 10 cities (Mashhad, Tehran, Gorgan, Bandar Abbas, Yazd, Shiraz, Kermanshah, Ilam, Birjand and Tabriz) by randomized sampling and completed 1000 questionnaires by citizens. Statistical analysis were performed using the Structural Equation Model and Liserl software. The results showed that attitude, subjective norm and perceived behavior control had a positive and significant effect on the intention to shrimp consumption. In addition, the perceived behavior control was also effective on increasing of shrimp consumption. It was found that only two assumptions about the significant effect of convenience of cooking on the attitude and the significant effect of income on the subjective norm were rejected and other assumptions (significant effect of quality, packaging and type of supply and processing on attitude, significant effect of price and positive and negative beliefs on subjective norm, significant effect of consumption time, availability and experimental records on perceived behavior control and significant effect of intention to consumption on increasing of shrimp consumption) were confirmed.
Volume 17, Issue 1 (5-2013)
Abstract
Consumer protection is very important for the today society. This theory aim to make a legal framework to protect & guarantee the consumer's rights like having safe goods & services right, having information right, choice right, etc. Unfortunately there are not any special rules and provisions in this respect in Iranian law.
But the Iranian judges, in their cases, verdict by interpretation of the present law and take help by comparing the Iranian law and regulations with the law and jurisprudence of other same legal systems, like French law.
This article compares the conditions and possibility of creating security obligation in Iran and France legal systems. This paper wants to consider the ability of Iranian system to protect the consumer´s rights.
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* Corresponding Author’s E-mail: rkhoshnoodi@yahoo.com