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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Archives of Bone and Joint Surgery
- نوع مقاله: Journal Article
- کلمات کلیدی: Osteoporosis,Compression fracture,Vertebroplasty
- چکیده:
- چکیده انگلیسی: Background: Osteoporotic compression vertebral fractures are common clinical problems. In those with refractory fractures, percutaneous cement augmentation has been suggested. The aim of this study was to evaluate the functional outcome of percutaneous vertebroplasty in Iranian patients with refractory osteoporotic fractures.
Methods: We retrospectively studied 37 osteoporotic fractures in 28 patients (6 men and 22 women), who had been treated with vertebroplasty from August 2009 to June 2012. The mean follow-up period was 12.1±3.6 (range: 6-42 months). The patients’ states were assessed by the visual analogue scale and short form-36 questionnaire. Student t test was used to analyze the pre- and postoperative data.
Results: The mean age of the patients was 71.6±6.1 (range: 50 to 91 years) and the most common fractured vertebrae were L1 and T12. There were five patients with two levels of vertebral fractures and two with three levels. Vertebroplasty could improve the scores for pain and quality of life from preoperative 7.6 ± 1.4 and 44.8 ± 7.6 to 1.8 ± 0.4 and 74.1 ± 5.3 at four weeks after surgery. At the last follow-up visit, this improvement continued with no significant decline. The most common complication was cement leakage (32.4% per vertebra), wherein all of of the patients were clinically asymptomatic. Adjacent vertebral fracture occurred in six cases. Conclusion: By understanding the risks, we propose vertebroplasty in Iranian patients with refractory osteoporotic vertebral fracture. If correctly performed, this procedure can significantly improve the pain and quality of life in these elderly osteoporotic patients.- انتشار مقاله: 12-03-1392
- نویسندگان: Farzad Omidi Kashani,Ebrahim Ghayem Hasankhani,Mohammad H Ebrahimzadeh,Amir Reza Kachooei,Mohammad Hasani,Ali Moradi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Optoelectronical Nanostructures
- نوع مقاله: Journal Article
- کلمات کلیدی: Optical properties,Graphene,Energy gap,Boron Nitride,Nanoribbons
- چکیده:
- چکیده انگلیسی: Abstract: In this study, using density functional theory and the SIESTA computational
code, we investigate the electronic and optical properties of the armchair graphene
nanoribbons and the armchair boron nitride nanoribbons of width 25 in the presence of a
transverse external electric field. We have observed that in the absence of the electric
field, these structures are semiconductors with a direct energy band at Γ point and
applying electric field on them causes to change in the band structure, increasing the
band gap and even eliminating the band gap. Increasing the intensity of the applying
field on the graphene nanoribbons reduces the distance between the maximum of the
highest valence band and the minimum of the lowest conduction band and shifts the
convergence of these two bands in K space from the Γ point to the X point. The energy
band gap of the boron nitride nanoribbons also has been decreased from 4.46 eV to less
than 32.6 meV in presence of a transverse electric field of intensity about 0.30 V/Ang
and a semiconductor-metal transition was observed in the presence of the stronger
fields.
Next, we investigate the effect of the transverse electric field on the optical properties
of both nanoribbons. Of course, in order to study the optical behavior of these systems,
we apply only a radiation with the parallel polarization. According to the changes that
the electric field makes on the band structure, we observed changes in the location and
intensity of the optical graphs peaks. Also with increasing the intensity of the field, we
observe a significant increase in the static dielectric constant and the plasmonic
behavior of these structures.- انتشار مقاله: 21-11-1398
- نویسندگان: Mohammad Hasani,Raad Chegell
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Kerman University of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: anxiety,green tea,Noise Stress
- چکیده:
- چکیده انگلیسی: Background: The recruitment of medicinal herbs for the treatment of psychological disorders such as anxiety and stress has a long history. The purpose of the present study was to investigate the compensatory effects of hydroalcoholic extract of green tea on anxiety behaviors that are induced by noise stress in male Wistar rats. Methods: In this study, male Wistar rats weighing 200±20 g were randomly divided into six groups (n = 10): 1) control group, 2) sham- noise stress (two times per day and each time for 15 minutes, for 21 days, without noise stress), 3) chronic noise stress (two times per day and each time for 15 minutes, for 21 days, at 87.3 dB(A) and the frequency of 80 kHz), 4) Green tea (50, 100, 150 mg/kg i.p. for three weeks), 5) sham- green tea with saline injection for 21 days, 6) noise stress + green tea extract (50, 100, 150 mg/kg i.p. for three weeks). Their serum cortisol levels was measured by ELISA test before and after the tests. Behavioral tests were performed including elevated plus-maze, territory discrimination, and passive avoidance test. All statistical analyses were performed using SPSS software. Results: Serum corticosterone levels significantly decreased in noise stress groups treated with green tea compared to the control group (P<0.05). Based on the passive avoidance test, the time spent in the dark box showed a significant decrease in the noise stress group treated with green tea (150 mg/kg) compared to the noise stress group. Based on the territory discrimination test, the delay for entering the foreign segment in the green tea treated-groups showed a significant decrease (P<0.05) as compared to the noise stress group. The results of the elevated plus-maze test showed a significant increase in the time spent on the open arms in green tea extract-treated groups in comparison with noise stress group. Conclusion: Findings show the unique properties of green tea extracts in reducing serum corticosterone levels and improvement of anxiety behaviors caused by noise stress in animals. In addition, the useful effects of herbal medicine on anxiety disorders were confirmed in our study.
- انتشار مقاله: 04-05-1398
- نویسندگان: Mohammad Hossein Mohammadi Mahdiabadi Hasani,Fatemeh Masjedi,Farnaz Khadivi,Shima Mohammadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Primary production,TSI,Choghakhor wetland,Nutrient effects
- چکیده:
- چکیده انگلیسی: Limitations in nutrients and physicochemical parameters play a key role in aquatic ecosystems. The present study aimed to determine the influential physicochemical factors in the chlorophyll-a content for wetland management by identifying the restricting factors in primary production. Sampling was conducted during March 2017-February 2018. Factors such as water salinity, temperature, pH, nitrate and phosphate concentrations, biochemical oxygen demand, total dissolved solids, electrical conductivity, total suspended solids, and dissolved oxygen were measured in triplicate at each station. In addition, the trophic state index (TSI) was used to determine the trophic state of the wetland. No significant difference was observed in chlorophyll-a contents in different seasons (P>0.05), with the highest values reported in spring and autumn, and the lowest values reported in summer. The maximum and minimum chlorophyll-a content were observed in stations A and C, respectively. Station A had a significantly higher value compared to the other stations (P<0.05). In addition, no significant differences were observed in the water physicochemical parameters in different seasons (P>0.05). The highest (5.9 mg/l) and lowest water nitrate levels (4.1 mg/l) were observed in spring and autumn, respectively (mean nitrate level: 4.84 mg/l). The highest (2.1 mg/l) and lowest water phosphate levels (0.47 mg/l) were observed in spring and autumn, respectively (mean nitrate level: 1.04 mg/l). Moreover, TSI indicated that the wetland is oligotrophic in spring and winter, while it is mesotrophic in summer and autumn. Overall, the nitrate level in water was the main restricting factor in the management of Choghakhor wetland.
- انتشار مقاله: 22-04-1397
- نویسندگان: Mohammad Hadi Abolhasani,Niloofar Pirestani,Saeed Ghasemi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Primary production,TSI,Choghakhor wetland,Nutrient effects
- چکیده:
- چکیده انگلیسی: Limitations in nutrients and physicochemical parameters play a key role in aquatic ecosystems. The present study aimed to determine the influential physicochemical factors in the chlorophyll-a content for wetland management by identifying the restricting factors in primary production. Sampling was conducted during March 2017-February 2018. Factors such as water salinity, temperature, pH, nitrate and phosphate concentrations, biochemical oxygen demand, total dissolved solids, electrical conductivity, total suspended solids, and dissolved oxygen were measured in triplicate at each station. In addition, the trophic state index (TSI) was used to determine the trophic state of the wetland. No significant difference was observed in chlorophyll-a contents in different seasons (P>0.05), with the highest values reported in spring and autumn, and the lowest values reported in summer. The maximum and minimum chlorophyll-a content were observed in stations A and C, respectively. Station A had a significantly higher value compared to the other stations (P<0.05). In addition, no significant differences were observed in the water physicochemical parameters in different seasons (P>0.05). The highest (5.9 mg/l) and lowest water nitrate levels (4.1 mg/l) were observed in spring and autumn, respectively (mean nitrate level: 4.84 mg/l). The highest (2.1 mg/l) and lowest water phosphate levels (0.47 mg/l) were observed in spring and autumn, respectively (mean nitrate level: 1.04 mg/l). Moreover, TSI indicated that the wetland is oligotrophic in spring and winter, while it is mesotrophic in summer and autumn. Overall, the nitrate level in water was the main restricting factor in the management of Choghakhor wetland.
- انتشار مقاله: 22-04-1397
- نویسندگان: Mohammad Hadi Abolhasani,Niloofar Pirestani,Saeed Ghasemi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Pharmaceutical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Artificial muscles,Ionic polymer metal composites,Sulfonated poly (ether ether ketone)
- چکیده:
- چکیده انگلیسی: The muscle-like technology would be of enormous advantages for biomedical applications such as medical implants and human assist devices. Ionic polymer metal composites (IPMCs) are one kind of biomimetic actuators. An ionic polymer metal composite composed from an ionomer with high ion exchange capacity that packed between two thin metal layers. In the present study we focused on the preparation of a novel alternative polymeric ionomer to be used as artificial muscles. Sulfonated poly(ether ether ketone) (PEEK) have been synthesized as a new class of ionomeric membrane materials. PEEK was sulfonated at various degrees with sulfuric acid and N,N-Dimethylacetamide as a solvent. Fourier transfer infrared spectroscopy confirmed the quality of substitution reaction. Sulfonated samples showed O-H vibration at 3490 and S=O peaks at 1085 and 1100-1300 cm-1. By increasing degree of sulfonation to 80%, ion exchange capacity, water uptake and the number of water molecules per the fixed sulfone groups ( λ) were increased to about 2.4 meq.g-1, 75% and 19, respectively. After calculating the optimum degree of sulfonation, the applications of these ionomers as actuators are studied. Rigid microstructure of PEEK backbone causes to slow displacement. However, this inflexible backbone showed the acceptable tip force during its actuation. These IPMC are easy to prepare and much less expensive than the commercial per-fluorinated membranes such as Nafion®. The results approve the utilization of sulfonated aromatic for artificial muscles applications as novel strong muscles with low flexibility.
- انتشار مقاله: 29-05-1386
- نویسندگان: Seyed Reza Ghaffarian,Homayoun Moaddel,Fatemeh S. Majedi,Mohammad Mahdi Hasani-Sadrabadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Fisheries Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Shadegan wetland,Carasobarbus luteus,growth and fishing indices,Von-Bertalanffy equation
- چکیده:
- چکیده انگلیسی: Estimation of length at maturation and spawning time and determination of fishing prohibition time and optimum length for catch are of important information about a fish species. Seasonal samplings were conducted over a year to study population dynamic of Carasobarbus luteus in Shadegan wetland. Samples were collected from five sampling stations in Shadegan wetland (Salmane, Rogabe, Khoroosi, Mahshahr and Atish) from April to March, 2014-2015. From total number of 1600 samples, 269 individuals were male and 1331 individuals were female. Length-weight relationships were W=0.0136L3.0124 (R2=0.92) for males; W=0.0136L3.0117 (R2=0.91) for females, showing isometric growth pattern. Condition factor (K) was calculated to be 1.308±0.15 and 1.368±0.17 for the males and females, respectively, showing significant difference between the genders (P<0.05). Overall, K coefficients of the males were lower than those of the females, which the highest and lowest values were related to winter and spring, respectively. Also, the results show that this species spawns in April-July with a long spawning period and sexual dormant period in autumn to early winter. Length at maturation was 152, 139 and 150 mm for males, females and whole specimens; whereas, weight of matured fish was 42 and 100 g for the males and females, respectively. Growth indices including L∞, growth coefficient and t0 was 305 and 301 mm, 0.67 and 0.55 per year and 0.23 and 0.29 for the males and females, respectively. Natural mortality, fishing mortality, total mortality, Munro Ф' and coefficient of exploitation was 1.22 and 1.02 per year, 1.61 and 1.45 per year, 2.83 and 2.47 per year, 2.79 and 2.72, and 1.61 and 1.45 per year respectively for the males and females. Von-Bertalanffy equation for the males and females was Lt =305(1- exp (-0.67(t +0.23))) and Lt =310(1- exp (-0.55(t +0.29))).
- انتشار مقاله: 20-03-1395
- نویسندگان: Rasool Ghorbani,Aliakbar Hedayati,Ahmadreza Hashemi,Mohammad Hadi Abolhasani,Ali Haghi,Mohammad Amini Chermahini
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Psychology (IPA)
- نوع مقاله: Journal Article
- کلمات کلیدی: Social Capital,cultural capital,institutional trust,Sense of school belonging
- چکیده: Cultural capital influencing students̓ attitudes toward school and the value of schooling, as well as transmitting notions about the nature of the wider society and people around them. In this study, the relation between students’ cultural capital and three non-cognitive attitudinal outcomes developing in the process of schooling including social trust, institutional trust (both as long-term outcomes), and sense of school belonging (a short-term outcome) was investigated.The present study was conducted with a descriptive-correlational design. A total of 528 students selected from Urmia secondary schools through stratified sampling responded to the questionnaire. The research data were collected using the standard questionnaires (Cultural capital: A researcher-made questionnaire based on the Bourdieu's theory, Social trust: Based on the Rosenberg’s (1956) notion of misanthropy, Institutional trust: A researcher-made questionnaire (Sabbagh et al., 2013) and Students' sense of school belonging: A 5-point Likert scale designed by Goodenow (1993)) and their validity and reliability were confirmed.Structural Equation Modeling (SEM) was used to study and evaluate the relationships between the studied variables. Path analysis results showed that, there is a positive and significant relationship between cultural capital and (social–institutional) trust, cultural capital and sense of school belonging and, between (social–institutional) trust and sense of school belonging.So, it can be concluded that, there is a positive and significant relationship between cultural capital of students and sense of school belonging by mediating role of trust in high school students.
- چکیده انگلیسی: Cultural capital influencing students̓ attitudes toward school and the value of schooling, as well as transmitting notions about the nature of the wider society and people around them. In this study, the relation between students’ cultural capital and three non-cognitive attitudinal outcomes developing in the process of schooling including social trust, institutional trust (both as long-term outcomes), and sense of school belonging (a short-term outcome) was investigated.The present study was conducted with a descriptive-correlational design. A total of 528 students selected from Urmia secondary schools through stratified sampling responded to the questionnaire. The research data were collected using the standard questionnaires (Cultural capital: A researcher-made questionnaire based on the Bourdieu's theory, Social trust: Based on the Rosenberg’s (1956) notion of misanthropy, Institutional trust: A researcher-made questionnaire (Sabbagh et al., 2013) and Students' sense of school belonging: A 5-point Likert scale designed by Goodenow (1993)) and their validity and reliability were confirmed.Structural Equation Modeling (SEM) was used to study and evaluate the relationships between the studied variables. Path analysis results showed that, there is a positive and significant relationship between cultural capital and (social–institutional) trust, cultural capital and sense of school belonging and, between (social–institutional) trust and sense of school belonging.So, it can be concluded that, there is a positive and significant relationship between cultural capital of students and sense of school belonging by mediating role of trust in high school students.
- انتشار مقاله: 21-05-1397
- نویسندگان: Masoumeh Talebi,Mohammad Hasani,Afshar Kabiri
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Smart Electrical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: partial shading,Photovoltaic (PV),B4 inverter,module integrated converter (MIC)
- چکیده:
- چکیده انگلیسی: This paper proposes a new configuration for solar energy conversion systems. One challenging issue of the photovoltaic (PV) systems is partial shading, and in this paper Module Integrated Converters (MIC) are used to overcome this problem in PV arrays. A few boost converters are employed as MICs to mitigate the shading effect. Furthermore, to reduce the cost and to increase the system performance the B4 inverter is used. This inverter is a four-switch, three-phase inverter. To validate the performance of the proposed system and simulation results, a typical prototype has been made and experimental results have been carried out. The results confirm the effectiveness of the circuit in mitigating the effects of partial shading
- انتشار مقاله: 04-10-1394
- نویسندگان: Reza Rezaii,Mohammad Amin Abolhasani,Ali Yazdian Varjani,Reza Beiranvand
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Health Policy and Management
- نوع مقاله: Journal Article
- کلمات کلیدی: Iran,Kerman,financial management,Health Sector Reform,Change Theories,Kurt Lewin’s Theory
- چکیده:
- چکیده انگلیسی: Background
Change theories provide an opportunity for organizational managers to plan, monitor and evaluate changes using a framework which enable them, among others, to show a fast response to environmental fluctuations and to predict the changing patterns of individuals and technology. The current study aimed to explore whether the change in the public accounting system of the Iranian health sector has followed Kurt Lewin’s change theory or not.
Methods
This study which adopted a mixed methodology approach, qualitative and quantitative methods, was conducted in 2012. In the first phase of the study, 41 participants using purposive sampling and in the second phase, 32 affiliated units of Kerman University of Medical Sciences (KUMS) were selected as the study sample. Also, in phase one, we used face-to-face in-depth interviews (6 participants) and the quote method (35 participants) for data collection. We used a thematic framework analysis for analyzing data. In phase two, a questionnaire with a ten-point Likert scale was designed and then, data were analyzed using descriptive indicators, principal component and factorial analyses.
Results
The results of phase one yielded a model consisting of four categories of superstructure, apparent infrastructure, hidden infrastructure and common factors. By linking all factors, totally, 12 components based on the quantitative results showed that the state of all components were not satisfactory at KUMS (5.06±2.16). Leadership and management; and technology components played the lowest and the greatest roles in implementing the accrual accounting system respectively.
Conclusion
The results showed that the unfreezing stage did not occur well and the components were immature, mainly because the emphasis was placed on superstructure components rather than the components of hidden infrastructure. The study suggests that a road map should be developed in the financial system based on Kurt Lewin’s change theory and the model presented in this paper underpins the change management in any organizations.- انتشار مقاله: 06-06-1392
- نویسندگان: Mohammad Hossein Mehrolhasani,Mozhgan Emami
- مشاهده