Showing 702 results for Fin
Volume 0, Issue 0 (1-2024)
Abstract
The agricultural ecosystem provides various functions and services for humans. So, investigating their role and importance in the agricultural land programming and management is one of the goals research. In this research used Common International Classification of Ecosystem Services (CICES) for the identification of the Agricultural Ecosystem Functions and Services (AEFS). Also, Multi-Criteria Decision-Making (MCDM) models used for weighting and prioritizing of the AEFS like Step wise Weight Assessment Ratio Analysis (SWARA) for calculating of their weight, and Simple Additive Weighting (SAW), Additive Ratio Assessment (ARAS), and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) used for prioritization them. The research data extracted with field survey, random sampling and completing the Delphi questionnaire of the 40 agricultural specialist experts in the north of Iran. Also, the R2 coefficient was used to compare the AEFS prioritization models. The SWARA technique findings showed that provisioning, regulation, and cultural functions with weights of 0.0298, 0.0286 and 0.0250 have the highest weight, respectively. Also, the results indicated that the SAW model with the R2=0.90 was chosen as the prioritization appropriate model. Provisioning, regulation, and cultural functions with marginal weights of 0.6319, 0.5448, and 0.5092 were ranked the first to third priority respectively. Also, food supply, employment, genetic material supply, and educational and research services were important positive services of the agricultural ecosystem compared to other services. it is suggested that more appropriate programming and more research be done by relevant organizations for the sustainable management of agricultural ecosystems in northern Iran.
Volume 0, Issue 0 (8-2024)
Abstract
The effective design of structures resistant to seismic vibrations is one of the main concerns of structural engineers to deal with damages caused by earthquakes, which can withstand more earthquake forces with methods such as energy dissipation. Recent earthquake records show that the earthquake record characteristic of the near area differs from the earthquake records of the far area. Among these characteristics, it can be mentioned that the pulse-type state of these records, as well as the high maximum speed and ground displacements. For this reason, these types of records increase the seismic requirements of the structure compared to normal earthquakes. The map of faults and seismic zoning of Iran shows that important urban points such as Tehran, Tabriz, etc. have high seismicity and are located near the fault. Therefore, it is necessary to design and build structures that can properly withstand the features of near-fault earthquakes, this issue reveals the understanding and recognition of the behavior of structural systems and the structure's response to the special features of near-fault earthquakes. This article first investigated the seismic evaluation of three existing 4, 8, and 12-story steel structures with lateral load-resisting systems. Then the desired structure was strengthened using a friction damper, and finally, the acceleration recorder was applied to the structure in the near- and far-fault earthquake zone case study. The seismic demand of the retrofitted structure was investigated in ANSYS Workbench finite element software, which was done in the form of modal analysis, floor drift displacement, structure acceleration response, and von Mises stress. For seismic validation, a two-story, single-span steel frame has been used. The dynamic load used was 0.5g based on the north-south component of the El Centro earthquake (1940) with a maximum acceleration scaled to 50 cm/s. To validate the numerical results, the horizontal displacement of two points on the first and second floor was compared with experimental data, and an acceptable accuracy was obtained. The results of the maximum acceleration at the highest point of the building showed that in a far-fault earthquake zone, the best effect of dampers was on 8-story buildings with a 77% decrease, and in a near-fault earthquake zone, it was related to a 4-story building with a 66.4% decrease in acceleration. Stress in near- and far-fault earthquake zones, the best effect of dampers was on 4-story buildings with 83% and 84% reduction, respectively. In a far-fault earthquake zone, the best effect of dampers was on 8-story buildings with a 44% reduction in maximum displacement, and in a near-fault earthquake zone, it was related to a 4-story building with a 61% reduction in acceleration.
Volume 0, Issue 0 (8-2024)
Abstract
Bars with standard hooks in tension are often used to anchor reinforcing bars where concrete dimensions element are not sufficient to provide the required development length for straight reinforcement. In previous researches, concrete breakout failure was the predominant failure mode of hooked bars. Closely-spaced hooks provide a lower strength per hooked bar than more widely-spaced hooked bars because the area of the breakout surface is reduced for the more closely-spaced bars. The effects of fy of bars, spacing, and confinement by ties or stirrups have been updated to reflect test results, in 25.4.3.1 of ACI 318-19. In this formula, The confining reinforcement factor ψr is based on test results reported by Ajaam et al. (2018). Base on ACI 318-19 definition, Ath is total cross-sectional area of ties or stirrups confining hooked bars. Therefore crossties are not included in the relationship. The purpose of this study is to expand the understanding of the behavior of confinement effect of crossties on development length bars with 90 degree bent hooks in tension. In this study, 3 simulated beam-column joints were tested as a continuation of previous work by Ajaam et al. (2018). The results of this experimental study show that the ACI318-19 provisions underestimate the contribution of confinement by crossties on the development length bars with 90 degree bent hooks in tension.
Volume 0, Issue 0 (8-2024)
Abstract
Steel plates are widely used in various industries, especially in civil engineering. Low cost in implementation and reduction of seismic mass are the advantage of steel shear wall system compared to other structural systems. The goal of a good design is that along with following the existing guidelines and achieving the desired seismic resistance of the structure, the structure is affordable in terms of weight and cost. Considering that according to the design, it is not possible to achieve the optimal use of the structure's capacity by force control method, the theory of uniform deformations was proposed with the assumption of a constant performance level. The subject of design based on performance increase the safety of the structure against earthquake force and design with optimal seismic performance during the useful life of the structure in seismic areas. Also, compared to the design method based on force control, it can lead to a lighter and economical design.
One of the significant ways to reduce the weight and stiffness of shear walls and boundary elements connected to them is to limit the connection of filler plates to boundary elements. In this method, limiting the length of the connection reduces the force on the beams and columns, and as a result, smaller sections can be used.
In this research, in order to achieve the optimal performance level, two concrete frames with steel shear wall resistant system are subjected to nonlinear analysis. Then, the initial evaluation of the behavior and the correctness of the used method are checked. After that, the effective factors in achieving uniform stress in the height of the structure will be investigated. For this purpose, by using the effect of the thickness parameter and the appropriate pattern of connection of the shear steel plate to the surrounding elements, the way of changing the performance and behavior of the structure will be investigated. For this purpose, 3- and 4-story concrete frames with steel shear wall systems were modeled using ABAQUSTM finite element software. The steel used in the steel shear wall system is ST37. First, the connection of steel shear plates to floor beams was considered and then the influence of the partial connection pattern on the seismic performance of the steel shear wall system was investigated. The modeled frames were subjected to dynamic analysis, linear and nonlinear buckling analysis, and cyclic analysis. Based on the obtained results, the property of energy dissipation in the frame with a steel shear wall system with partial connection has increased significantly. Changing the partial connection pattern led to changing the maximum in-plan relative displacement. Also, the surface of the stress distribution shows that in the partial connection, the stress concentration mainly occurred in the place of the steel shear plate connections. In addition, according to the results of cyclic analysis, considering the partial connection of the steel shear wall has led to a decrease in the average energy absorbed in the structure and an increase in its ductility. Also, changing the connection pattern has affected the average amount of absorbed energy in different loading cycles.
Volume 1, Issue 1 (3-2013)
Abstract
Twenty five individuals of Javelin grunter, Pomadasys kaakan, collected from Abadan (29° N and 48° E) and Bandar Abbas (27° N and 56° E) stations along the Persian Gulf, was analyzed for relationship between two populations of this species, using Amplified Fragment Length Polymorphism (AFLP). A total of 410 putative loci were detected by six primer combinations, 88 of which were polymorphic (21.46%). The proportion of polymorphic loci in the Abadan and Bandar Abbas stations was calculated 88.64 and 68.18%, respectively. Average of heterozygosity in the Abadan (0.330) was higher than Bandar Abbas (0.222), which may be correlated with the environmental and ecological conditions of these stations. Nei’s genetic distance for the two populations was estimated 0.112. The phylogenetic tree revealed a clear distinction line between the two populations, supporting that dispersal of eggs and larvae in the Persian Gulf is spatially restricted. Pattern of isolation by distance was observed in this species, indicating that the gene pool of P. kaakan in the Persian Gulf was not homogeneous. The results also showed that AFLP is a potent technique for genetic fingerprinting and species identification.
Volume 1, Issue 1 (3-2013)
Abstract
Today fingerprinting techniques are increasingly adopted as an alternative and more direct and reliable means of assembling sediment source information. One of the principal assumptions of sediment fingerprinting is that potential catchment sediment sources can be distinguished on the basis of their physical, geochemical and biological properties or fingerprint properties. However, while the source fingerprinting approaches necessarily assume conservative behaviour of the fingerprint properties, some in-stream alteration of these properties during both transport and short-term storage is probably inevitable. This potential limitation must be judged in the context of the problems associated with the use of sediment fingerprinting techniques. Samples of sediment source and reservoir sediment collected during the present study have been used to determine the conservative behavior of fifteen fingerprint properties. Comparison of fingerprinting property concentrations of intensive properties used in fingerprinting indicates there is an increase in content of the N, P, C, Co, Cr, clay minerals (smectite, illite, kaolinite), Low Frequency Magnetic Susceptibility (XLF) and Frequency Dependent Magnetic Susceptibility (XFD) and decrease in clay mineral chlorite and base cations Ca, Mg, Na and K. The results indicate that N, Na and smectite properties have no significant difference in reservoir sediment samples than that in sediment source samples and therefore are useful for fingerprinting investigations in these catchments.
Volume 1, Issue 1 (3-2023)
Abstract
Low Intensity Magnetic Separators (LIMS) are widely used in research and industry. The design of this separator is based on drum rotation inside a tank media, so that a permanent magnets placing inside the drum as an angle form, produces a magnetic field. In this study, the behavior of magnetic and none-magnetic particles of a pulp, flowing through a magnetic field in the wet LIMS, was simulated and validated by experimental results. The magnetic field variables were calculated in an FEM based simulator (COMSOL Multiphysics); while particles’ tracking was done applying CFD numerical method, enhanced by discrete phase model (DPM). The difference between the results of the simulation and the magnetic separation experimental test (recovery of magnetic particles in the concentrate product) was 16.4%. In order to quantify the results of the simulation, magnetic separation simulation was performed by changing two variables affecting the magnetic separation process (variables of particle size of the input pulp feed particles and solid percentage of input pulp) and corresponding experiments. Comparison of laboratory and simulation results showed that the trend of simulation results is consistent with laboratory results of the weight recovery (in both variables under study), so that the maximum simulation error is related to the size of 125 microns (16.5 %) and the lowest simulation error was in 180 microns (11.4 %). Also, the lowest simulation error in the weight recovery prediction was related to the pulp feed solid percentage of 15% (equivalent to 14%) and the highest simulation error was in 30% pulp feed solid percentage (16.9 %). This proposes that FEM-DPM-CFD coupling model, can be applied for simulation, optimization, design and construct
Volume 1, Issue 2 (9-2011)
Abstract
Introduction of modern technologies such as internet has had some downsides as well. The aim of the present study is to investigate some disadvantages of the integration of modern technology in organizations. The main body of the investigation will concentrate on the effect of different influential factors on cyber-loafing among the members of an organization. Regarding the literature on the subject matter, one of the leading factors that causes cyber-loafing is organizational justice. First, the influence of organizational justice, as the independent variable, on the distributional justice, procedural justice, and interactional justice is be discussed in details. Later on, the moderating role of perception of the organizational control in relation to organizational justice and cyber-loafing will be talked over. For testing the first hypothesis of the study, which focuses on the negative influence of organizational justice on cyber-loafing, the Lisrel software was used in through path analysis and structural equation modeling. The results obtained from 152 questionnaires distributed, among the employees of an automobile company, confirmed the credibility of the first hypothesis. Also the findings did not confirm the idea that the perception of organizational control plays a moderating role with regard to organizational justice and cyber-loafing.
Volume 1, Issue 3 (9-2023)
Abstract
Changes in pore fluid can significantly impact the geotechnical behavior of soil, especially clayey soil. One source of soil contamination is leachate, which can infiltrate nearby soil during the collection, transportation, and deposition stages of the residential waste disposal process, exerting geotechnical influences on the soil in the surrounding area. To assess these effects, four leachate samples were collected from different sites. The specimen comprises fine soil, created from a mixture of sand, bentonite, and kaolinite. Experimental results reveal a decreasing trend in the liquid limit, compaction parameters, and cohesion values of the soil with an increase in contamination level. However, the internal friction angle exhibits an increasing trend with higher leachate concentration, resembling the behavior of sandy soil, as opposed to the typical behavior of clay.
Volume 1, Issue 4 (12-2023)
Abstract
Today, financial development is one of the main drivers of economic growth and development. Since developing countries are focused on the rapid expansion of economic growth, they have taken steps toward the development of financial markets. However, the consequences of financial development on environmental quality are not clear. In addition, since the emission of carbon dioxide caused by production is significantly different from the emission of carbon dioxide caused by consumption in some countries (such as China). Therefore, this article examines the impact of financial development on the consumption-based CO₂ emissions for a panel of 17 developing countries during the period of 1990-2019 with a Panel- Quantile approach. Empirical findings show that the effect of financial development on consumption-based CO₂ emissions is positive and significant in all quantiles. In addition, this study considers gross domestic product, rental rates of natural resources, trade openness, and globalization as control variables. The results of this study provide new evidence for policymakers to maintain environmental quality by focusing on the link between financial development and consumption-based CO₂ emissions.
Volume 2, Issue 1 (1-2000)
Abstract
The ovipositiomil behaviour and success of Anagyrus pseudococci (Girault), an
encyrtid endoparasitoid of mealybugs, Planococcus citri (Risso) and Pseudococcus
affinis (Mask.) were studied in the laboratory. Behavioural sequences during
oviposition starting from the searching for the host to the post-oviposition activities
were described. Once encountered, the mealybug host was examined and probed by the
ovipositor of the parasitoid. Oviposition success was influenced by the defence activity
of the host. P. citri was less able to defend itself and was more susceptible to
parasitism than P. affinis. Oviposition experience of the parasitoid played an
important role in increasing the efficacy of subsequent oviposition.
Volume 2, Issue 1 (3-2022)
Abstract
In this note, I argue that Fine's pure logic of ground is nothing but the structural fragment of RM. This result raises a problem for discriminating between ground and relevantistic deduction in Fine's theory of ground.
Volume 2, Issue 2 (6-2016)
Abstract
The fauna of Onychiurinae were investigated in different parts of Kermanshah province during 2013–2014. Specimens were collected from both leaf litter and surface layer of the soil. Totally four species from three genera were found. All of them are new for Kermanshah province and Protaphorura levantina (Christiansen, 1956), Heteraphorura cf. japonica (Yosii, 1967) and Vibronychiurus archivari (Christiansen, 1956) were not previously recorded in Iran; it is also the first time that the genus of Vibronychiurus Pomorski, 1998, is collected and reported for the country.
Volume 2, Issue 4 (12-2022)
Abstract
Thought in Frege’s point of view is accompanied by innovations as well as ambiguities that have been examined from various points of view. But Frege's view of conventional definitions of truth and rejecting them is the main topic of this article. In his explanation of propositions containing thought and judgment, Frege doesn’t accept the conventional definitions of truth for their sequence, and in order to solve the problem of achieving the truth and value of propositions, he proposes "Thought" and tries to replace it. In order to clarify this claim, we first examine language and thought from his point of view, and then by entering into the subject of thought and discovering its characteristics, we will try to understand Frege's claim to replace it with the definitions of truth. Finally, with the plan of seven critiques, the author believes that this replacement is not possible and fruitful.
Volume 2, Issue 8 (3-2022)
Abstract
The purpose of this study was to evaluate the performance of the Chess Federation of the Islamic Republic of Iran based on a 360-degree approach. The population consisted of three groups of managers, athletes and stakeholders (n = 1090). A researcher-made questionnaire was used for data collection that included three sections: demographic information and performance comparison of the previous period and a new period of chess federation management (including six dimensions of management and finance, evaluation, control and supervision, human resource management, championship and achievement of goal). Education, research and cultural and information technology) and factors influencing the development of this federation. Twelve experts confirmed the validity of the questionnaires, and their reliability was confirmed by Cronbach's alpha test (α = 0.88, α = 0.90). Data analysis was done using descriptive and inferential statistics Kolmogorov-Smirnov, paired t-test, independent t-test and Friedman test using SPSS 22 software. Finally, the impact of four factors on the progress of this federation was calculated and ranked. Based on the research findings, it can be concluded that the federation has improved in every six dimensions in the new management period compared to the previous one. Regarding factors influencing progress, management and finance had the highest and information technology and athletes had the least impact on federation progress. In general conclusion, it can be said that the correct management of variables affecting chess exercise can improve the performance of this sport.
Volume 2, Issue 8 (3-2022)
Abstract
One of the projects in the department of physical education at the ministry of Education is the school sport Olympiads, which will require the development of government funds and other sectors to achieve the project's further benefits and goals. Therefore, this research aims to provide a model for the development of financial resources for the school sports Olympiad. The present study has applied exploratory purposes. In terms of data presentation, the type of research is theoretical, and in terms of data search, it is qualitative research. The grounded theory approach was used in this research, and Strauss and Corbin's methods were used. Statistical samples were from managers, deputies, physical education teachers, physical education experts in the departments, and executive officials of the Olympiad. We chose the samples purposefully and proceeded with the snowball method until we reached theoretical saturation. Data gathering tool in the field method: Semi-structured interviews and in the library method: phishing, a compilation of literature and theoretical framework. For data analysis, open coding, axial coding and selective coding were used to reach concepts, categories and final theorems. In this study, 218 concepts and 21 categories of interviews were extracted. Five categories and 39 concepts in the Causal conditions, seven categories and 30 concepts in the Context conditions, six categories and 33 concepts in the Intervening conditions, six categories and 33 concepts in the Strategies, and six categories and 36 concepts in the Consequences. Expected outcomes of the final model: increased moral and financial attention of authorities, increased funding for the project, greater private sector participation, strengthened management and planning, quantitative and qualitative improvement of space and equipment and more realization of the objectives of the school sports Olympiads.
Volume 3, Issue 1 (6-2014)
Abstract
The effect of edible chitosan and chitosan-gelatin coating on the quality of fish finger from silver carp during refrigeration was assessed. Fish fingers were immersed separately in coating solutions of chitosan 1% and chitosan 1%-gelatin 4%, packed and stored in refrigerator (4±1˚C) for 30 days, then their chemical (TVB-N, PV, TBA) and microbiological characteristics (TVC and PTC) were analysed. Total volatile basic nitrogen value of coated sample with chitosan was lowest while there was no significant difference between the thiobarbituric acid value of coated treatments (p<0.05). Among the coated samples, chitosan coating effectively reduced the total viable count (TVC) and psychrotrophic count (PTC). This reduction was 3.2 and 2.6 log10 cfu/g for TVC and PTC at 12 day, respectively, in comparison with control. Thus it can be considered that fish fingers coated with chitosan coating solution was more effective than chitosan-gelatin coating and uncoated samples and increased the shelf life of fish fingers for 18 days.
Volume 3, Issue 2 (6-2012)
Abstract
If a language makes use of a case marker to indicate the role of the object in a sentence, that marker is called “object case marker”. In some languages, only a subset of objects is marked with a case marker, which is called “differential object marking” (DOM). Definiteness and animacy of the object are among the factors for an object to be accompanied with a case marker.
This article studies the effect of definiteness and animacy on the use of the object marker in Mâzandarâni, a modern North-Western Iranian language of the Southern Caspian subgroup. Studying DOM in a Mâzandarâni corpus, 148 noun-phrases as direct object of the verb were recognized, and animacy and definiteness were the influential factors on the use of object marker with an object in this corpus.
Volume 3, Issue 2 (9-2014)
Abstract
Three types of fish fingers prepared from common carp (Cyprinus carpio) meat (chopped fillet, minced, and surimi) were organoleptically compared. After the molding, glazing and coating, fish fingers were fried in oil at 180°C for 8 minutes. Organoleptic indicators in terms of texture, taste, smell, color and general acceptability were assessed by panelists. The fish finger from surimi in terms of organoleptic indicator was significantly different (p<0/05) from other samples. The results of general acceptability showed that the fish fingers from surimi had higher quality than other samples. Therefore, surimi is recommended in preparation of fish finger from common carp.
Volume 3, Issue 5 (4-2016)
Abstract
The Holy Quran has been translated to very diverse languages from the distant past and through this, has found opportunities to transfer its sublime teachings to people with different languages and distinctive cultures. In addition to translating the Holy Quran in and of itself, these efforts have caused various works on theoretical and practical issues of the translation of the Holy Quran, and its principles and methodology have been discussed. In continuation of the same effort, this study would like to introduce "the etymology of roots" as an effective method in finding equivalents, and to apply it in a matter of the root "LBS". Muslim scholars have mentioned different analyses, and occasionally incoherent ones about this Arabic root in their exegetical and linguistic works, which is also manifested in translations of the Holy Quran. Applying "the etymology of roots", this study tried for the first time to investigate the root "LBS" in all branches of Semitic languages, and understand its original meaning, and then probe its semantic changes up to the age of the revelation of the Holy Quran. Moreover this study discussed strong and weak points of the equivalents proposed in Persian and English translations of the Holy Quran.