Showing 6 results for Ansarian
Volume 6, Issue 4 (Fall 2018)
Abstract
Aims: Cardiovascular Diseases (CVDs) are the main causes of death and have the first place among other diseases throughout the world. Studying the situation of risk factors for CVDs seems necessary in Iran at various periods. The aim of this study was to determine risk factors for cardiovascular diseases (CVD) among the employees of Ilam University of Medical Sciences in order to design appropriate educational interventions.
Materials and Methods: In this descriptive cross-sectional study, which was conducted in 2017, 294 employees of Ilam University of Medical Sciences participated after presenting written consent forms. To collect data, a researcher-made questionnaire was designed and applied after verifying the validity and reliability (Cronbach’s alpha greater than 0.8). Eventually, the data were analyzed, using SPSS 16 and appropriate statistical methods.
Findings: Generally, 46.3% of the participants had a history of CVDs, 21.8% had a history of death caused by these diseases in their family, and 69.4% had a history of death caused by CVD among their relatives; 72.4% of the participants did not exercise daily and the mean daily exercise of participants was 8.08±1.51 minutes. Totally, 41.5% of the participants were taking solid oil, 78.6% were high-fat dairy consumers, and 41.2% consumed red meat more than twice a week.
Conclusion: Performance of the participants in terms of physical activity and consuming fruits and vegetables, fish, red meat, and fatty foods is undesirable, indicating the unhealthy lifestyle of people and their exposure to CVDs.
Volume 7, Issue 4 (No.4 (Tome 32), (Articles in Persian) 2016)
Abstract
The present research explores the “wæl”, “tɑ” and “ærɑ” prepositions in Gurani Kurdish within the framework of cognitive semantics. One of the recent models in semantic analysis of prepositions is Principled polysemy model (Tyler & Evans, 2001, 2003; Evans & Tyler, 2004a, 2004b; Evans, 2004, 2005, 2006) that suggests explicit and applicable criteria for determining the distinct senses as well as the primary sense of prepositions. We aim to analyze the semantics of three mentioned prepositions, to determine their distinct senses and primary sense, and to represent their semantic networks. The results suggest that the primary sense of “wæl” is “companionship” and its semantic network contains 9 distinct senses and 2 clusters of senses. The primary sense of “tɑ” is “ending” and its semantic network contains 4 distinct senses and 1 cluster of senses. The primary sense of “ærɑ” is “for and sake” and its semantic network contains 4 distinct senses and 1 cluster of senses.
Volume 11, Issue 1 (Vol. 11, No. 1 (Tome 55), (Articles in Persian) 2020)
Abstract
The purpose of the present study is to apply the concept of ‘second order schemas’ within the framework of Construction Morphology (Booij, 2010, 2018) for analyzing some morphological structures in Persian in order to explain how these structures are formed. Second order schemas, which are defined as sets of two or more paradigmatically related constructional schemas, are employed in the present research as an analytical tool for explaining three morphological patterns that predominantly are related to scientific disciplines, branches and technologies. These patterns include: (1) nouns with the structure [N-ʃenɑs-i] and their corresponding relational adjectives; (2) nouns with the structure [N-negɑr-i] and their corresponding relational adjectives; (3) nouns with the structure [N-kɑv-i] and their corresponding relational adjectives.
In the first derivative structure, a noun is combined with the present stem of ‘ʃenɑs’ (‘know’) and the suffix ‘i’. The output of this schema is a noun denoting a scientific discipline or branch, as represented below:
[[x]Ni -ʃenɑs]N –i]Nj ó [a scientific discipline/branch for studying SEMi]j
The above schema has two corresponding relational adjectives, as illustrated below:
Noun Relational adjective 1 Relational adjective 2
zabɑn-ʃenɑs-i (‘linguistics’) zabɑn-ʃenɑxt-i (‘linguistic’) zabɑn-ʃenɑs-ɑne (‘linguistic’)
ravɑn-ʃenɑs-i (‘psychology’) ravɑn-ʃenɑxt-i (‘psychologyical’) ravɑn-ʃenɑs-ɑne (‘psychologyical’)
These two patterns can be accounted for by the following second order schemas in which
there is a paradigmatic relationship between the verb stems or the affixes in the two constructional schemas.
<[[x]Ni -ʃenɑs-i]Nj ó SEMj> ≈ <[[x]Ni -ʃenɑxt-i]Ak ó [Related to/based on SEMj]k>
<[[x]Ni -ʃenɑs-i]Nj ó SEMj> ≈ <[[x]Ni -ʃenɑs-ɑne]Ak ó [Related to/based on SEMj]k>
In the second derivative structure, a noun is combined with the verb stem ‘negɑr’ (‘graph’) and the suffix ‘i’ to form a noun denoting a scientific method or technology.
<[[x]Ni -negɑr-i]Nj ó [a scientific method/technology for studying/analyzing SEMi]j>
The paradigmatic relationship between this schema and its two adjectival schemas can be expressed by the following second order schemas:
<[[x]Ni -negɑr-i]Nj ó SEMj> ≈ <[[x]Ni -negɑʃt-i]Ak ó [Related to/based on SEMj]k>
<[[x]Ni -negɑr-i]Nj ó SEMj> ≈ <[[x]Ni -negɑr-ɑne]Ak ó [Related to/based on SEMj]k>
Here is an example of the above two second order schemas:
Noun Relational adjective 1 Relational adjective 2
qowm-negɑr-i (‘ethnography’) qowm-negʃt-i (‘ethnographic’) qowm-negɑr-ɑne (‘ethnographic’)
In the third derivative structure, a noun is combined with the verb stem ‘kɑv’ (‘analyze’) and the suffix ‘i’ to form a noun denoting a scientific discipline, approach or method.
<[[x]Ni -kɑv-i]Nj ó [a scientific discipline/approach/method for studying/analyzing SEMi]j>
An example of this schema and its two relational adjectives is as follow:
Noun Relational adjective 1 Relational adjective 2
ravɑn-kɑv-i (‘psychoanalysis’) ravɑn-kɑft-i (‘Psychoanalytic’) ravɑn-kav-ɑne (‘Psychoanalytic’)
The following second order schemas show the morphological patterns of the corresponding relational adjective:
<[[x]Ni -kɑv-i]Nj ó SEMj> ≈ <[[x]Ni -kɑv-ane]Ak ó [Related to/based on SEMj]j>
<[[x]N –kɑv-i]Ni ó SEMi> ≈ <[[x]N –kɑft-i]Aj ó [Related to/based on SEMi]j>
The results show that ‘second order schemas’ are useful analytical tools for explaining the way in which the aforementioned structures are formed. These results also suggest that the constructional approach, unlike the derivational approach, can promisingly explain the way in which such problematic structures are formed.
Iman Ansarian, Mohammad Hossein Shaeri, Mahmoud Ebrahimi,
Volume 18, Issue 2 (4-2018)
Abstract
Commercial pure (CP) titanium has many applications in biomaterials especially in implants due to its excellent biocompatibility. The major weakness of CP titanium is low strength compared to that of other titanium alloys. One of the methods can be used to increase the strength of CP titanium are severe plastic deformation methods such as multi directional forging (MDF). Therefore, the aim of this research is the improvement of CP titanium strength by grain refinement in MDF process. For this purpose, after one hour annealing at 800°C, the CP titanium was forged by MDF process up to six passes at ambient temperature. Microstructural studies were performed by optical microscope and scanning electron microscope equipped with EBSD. Mechanical properties were also studied by Vickers’ microhardness and tensile tests. The finite element simulation by Abaqus software was also applied to predict the strain distribution during MDF process. The results of microstructural analysis showed that the average grain size decreased significantly after the MDF process and increasing the pass numbers of MDF led to an increase in grain refinement. After six passes of the MDF process, the average grain size decreased from 45 microns to 390 nm. Mechanical properties results showed that the strength and hardness of specimens increased with MDF process and increasing the number of passes. The hardness and strength of six passes MDFed specimen was about 2 times greater than those of annealed specimen. The strain distribution results obtained from the simulation showed good agreement with experimental results of microhardness distribution.
Z. Zarei, M. Talafi Noghni, M.h. Shaeri, I. Ansarian,
Volume 19, Issue 8 (August 2019)
Abstract
In this research, Cu-30Zn alloy was subjected to severe plastic deformation (SPD) by Multi-Directional Forging (MDF) process up to 6 passes at room temperature. After the samples fabrication, microstructure, mechanical, and electrical properties were investigated. Mechanical properties of the samples were measured by shear punch, tensile, and hardness tests at room temperature after each pass of MDF process. In addition, electrical properties of the samples were evaluated by Eddy Current method. The results of microstructure characterization by scanning electron microscopy equipped with EBSD attachment showed that the grain size of the initial annealed specimen reduced from about 230 µm to less than 1 µm, after 6 passes of MDF process. Furthermore, grain size reduction was accompanied by slip process, formation of twinning, and shear bonds in a specific direction. According to the results, mechanical properties were significantly improved after 6 passes of MDF. MDF process led to a 212% increase in hardness, enhancement of 105% and 73% in shear yield and ultimate shear strengths, and also improvement of 298% and 190% in tensile yield and ultimate tensile strengths, respectively. The results of the electrical conductivity showed that the electrical conductivity of the Cu-30Z alloy reduced slightly during the MDF process. Comparison of mechanical and electrical properties results demonstrated that high-strength alloys can be obtained in the MDF process without significantly reduction in the electrical conductivity.
I. Ansarian, M.h. Shaeri,
Volume 20, Issue 3 (March 2020)
Abstract
Commercial pure (CP) titanium has many applications in biomaterials especially in implants due to its excellent biocompatibility. Despite the importance of surface properties in bio-applications, limited research has been conducted to improve surface properties of CP titanium by improving the structure. Therefore, the purpose of this research is to improve the corrosion and wear properties of CP titanium by reducing grain size by multi-directional forging (MDF) process. For this purpose, annealed CP titanium samples were forged by MDF up to six passes at ambient temperature and 220°C. To investigate the corrosion properties of specimens, the tafel polarization test was performed in a simulated body fluid (SBF) solution. The tribological properties were also investigated by pins-on-disk test at sliding speed and applied stress of 0.2 (m/s) and 1MPa, respectively. The results of microstructure analysis of the samples using a scanning electron microscope (SEM) equipped with EBSD showed that the ultrafine grain structure was formed in titanium CP, after 6 passes of the MDF. The results of the investigation of the tafel polarization test showed that the corrosion resistance of the samples increased with applying MDF and increasing the pass number, regardless of the processing temperature. Also, the corrosion resistance of MDFed samples at 220°C temperature was higher than the MDFed samples at ambient temperature. Wear resistance of CP titanium was also increased, by decreasing the grain size. The results of the investigation of surface morphology of samples using a field-emission scanning electron microscope showed mainly the abrasive and delamination wear mechanisms.
