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- جایگاه : پژوهشی
- مجله: Interdisciplinary Journal of Virtual Learning in Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Learning,university,Organizational Learning,Manpower
- چکیده:
- چکیده انگلیسی: Introduction: In today's dynamic and diverse world, if organizations only depend on their prior knowledge they will not flourish. Learning is the key to solving organizational problems. Successful organizations are those that learn and move faster than others. Currently, globalization, clients high expectations, and competition are factors that necessitate learning. We aimed to assess the learning capability of university employees during 2012. Materials and Methods: This study was a descriptive survey conducted on 208 employees of Shiraz University. Data were collected using a questionnaire developed by Sanga.P learning organization. Face and content validity of the questionnaire and its reliability were confirmed by expert opinion and s Cronbach's alpha of 0.97. Results were reviewed and analyzed using SPSS software. Results: The results showed that according to the views of employees (208 people), Shiraz University is at a level higher than the average in terms of indicators of the learning organization's characteristics. The most powerful dimension of employee's learning in Shiraz University was related to mental patterns (average of 3.73) and the weakest one was related to individual mastery and systematic thinking (average of3.49). We found that sex had no significant effect on the learning organization. Conclusion: Higher education, as the largest center of knowledge creation and development, has a key role in the development of countries. Therefore, some conditions should be provided for higher education to address community needs and expectations. In this way, higher education can continuously improve the quality of its processes and activities. In this regard, the role of human resources is more than what was observed in the past.
- انتشار مقاله: 11-10-1398
- نویسندگان: Zahra Yazdani,Zohreh Riazi,Mozhgan Sayadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Women’s Health Bulletin
- نوع مقاله: Journal Article
- کلمات کلیدی: Iran,age,Exercise,Shiraz,Menarche
- چکیده:
- چکیده انگلیسی: Background: Menarche is a woman’s first menstruation and is determined by multiple factors. Objectives: The aim of this study was to evaluate the effect of exercise on the age of menarche in girls at guidance schools of Shiraz, Iran. Patients and Methods: This cross-sectional study attempted to evaluate the effect of regular exercise on the age of menarche in relation to demographic data in 483 randomly selected girls from guidance school in Shiraz, Iran, using statistical analysis including independent t-test, variance analysis and linear regression tests. Results: Participants were divided in two groups including 181 and 302 athletic and non-athletic girls, respectively. A statistically significant difference was found in the mean age at menarche between athletic 12.4 ± 0.9 SD and non-athletic girls 12.1 ± 1.0 SD years (P = 0.003). Linear regression indicated that mother’s age (P = 0.049) and exercise (P = 0.001) both have significant association with age at menarche. Conclusions: The age at menarche for the athletic group was significantly delayed. Exercise and mother’s age were significantly associated with age at menarche, whereas no significant association was observed between age at menarche and weight, BMI, father’s age, and mother’s and father’s educational levels.
- انتشار مقاله: 11-10-1348
- نویسندگان: Raha Afshariani,Leila Malekmakan,Maryam Yazdankhah,Arghavan Daneshian,Mehrab Sayadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Water and Environmental Nanotechnology
- نوع مقاله: Journal Article
- کلمات کلیدی: Catalysis,Nanocomposites,Ibuprofen,Palladium,Ultrasonics
- چکیده:
- چکیده انگلیسی: Worldwide studies on contamination levels of anti-inflammatory drugs such as ibuprofen (IBF) show that their concentration in water bodies is increasing. Graphene oxide/palladium nanoparticle (Pd NPs-GO) was synthesized via a simple solvothermal method. The characteristics of the as-prepared samples were examined using X-ray fluorescence, scanning electron microscopy, and Fourier transforms infrared spectroscopy. The performance of Pd NPs-GO nanocomposite as a sonocatalyst was evaluated for the degradation of IBF under ultrasonic irradiation (35 kHz), and compared with graphene (GO) and palladium nanoparticle (Pd NPs). Some influencing parameters such as IBF initial concentration, pH, catalyst dosage, and irradiation time were investigated. The findings showed that Pd NPs-GO nanocomposite exhibited higher sonocatalyst activity for IBF than other catalysts. A higher ibuprofen degradation efficiency was observed in lower pH (3), lower initial concentration (30 mg/L), higher catalyst dosage (2 g/L), and higher ultrasonic irradiation time (50 min). The kinetics of the degradation of IBF followed pseudo-first-order reaction kinetics.
- انتشار مقاله: 02-07-1398
- نویسندگان: Atiyeh Yazdani,Mohammad Sayadi,Ava Heidari
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Water and Environmental Nanotechnology
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,Nanoparticles,Cadmium,Green synthesis,Dictyota indica extract
- چکیده:
- چکیده انگلیسی: The green synthesis of palladium oxide nanoparticles using Dictyota indica seaweed extract was investigated. Dictyotales is a large order in the brown algae (class Phaeophyceae). The color of the reaction mixture changed which indicated the formation of palladium oxide nanoparticles. UV-Visible, SEM, TEM, XRD, and FTIR analysis determined the characteristics of synthesized nanoparticles. The UV-Visible analysis showed the formation of palladium oxide nanoparticles. SEM and TEM analyses presented the palladium oxide nanoparticles have a spherical shape and based on DLS analysis with the average particle diameter of 19nm. The comparisons of the nanoparticle size with different biological synthesis were studied which revealed this methodology offer smallest size. The crystallographic parameters of the synthesized Pd nanoparticles were as follows: crystalline structure (cubic), space group (Fm-3m), and lattice parameter (a=5.6500, b=5.6500, c=5.6500, α=90, β=90, and γ=90). FTIR analysis indicated the presence of a palladium oxide group in the product. The removal efficacy of cadmium by the palladium oxide nanoparticles was investigated to optimize the pH, contact time, dose of adsorbent and concentration of cadmium. The results showed that optimum conditions for cadmium removal from water were obtained at pH 8, 500 mg/l adsorbent dose and 20 min contact time, wherein in these circumstances the removal of cadmium was 82.82%. The adsorption isotherms primacy was as follows, Langmuir R2=0.9904> Freundlich R2=0.9857> Temkin R2=0.8791.
- انتشار مقاله: 21-04-1397
- نویسندگان: Atiyeh Yazdani,Mohammad Sayadi,Ava Heidari
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Water and Environmental Nanotechnology
- نوع مقاله: Journal Article
- کلمات کلیدی: heavy metals,Synthesis,Drinking Water,alga,Initial Concentration
- چکیده:
- چکیده انگلیسی: The presence of Arsenic in drinking water is the greatest threat to health effects especially in water. The purpose of this study is application of green palladium nanoparticles for removal of trivalent Arsenic from aqueous solutions and also the impact of some factors such as retention time, pH, concentration of palladium nanoparticles and Arsenic concentrations was studied. The values for Arsenic removal from aqueous solutions were measured by furnace atomic adsorption spectrometry (Conter AA700). In the study, Langmuir and Freundlich isotherm models and pseudo-second order kinetic model were studied. The results of optimization is shown that 0.5 g of nanoparticles can removed %99.8 of Arsenic with initial concentration of 0.5 g/l, in 5 minutes at pH=4. Langmuir model, Freundlich model (R2=0.94) and pseudo-second order kinetic model (R2=0.99) shown high correlation for removing of Arsenic from aqueous solutions. It was found, palladium nanoparticles can be used as an efficient method to remove Arsenic from aqueous solutions in a short time.
- انتشار مقاله: 25-08-1395
- نویسندگان: Farzaneh Arsiya,Mohammad Sayadi,Sara Sobhani
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Kerman University of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Benign prostate hyperplasia,Human papilloma virus,Prostate carcinoma
- چکیده:
- چکیده انگلیسی: Background: Different studies assessed the role of inflammation in malignancy of different organs. Prostatitis has been suggested as a cause of cancer and BPH. Till now, more than 100 types of human Papilloma virus (HPV) are recognized including low and high-risk groups for carcinogenesis. Among them HPV-16 and HPV-18 have shown further association with cancer. Regarding the presence of E6 and E7 in HPV and ability for modification of basal epithelial cells, related role in prostate cancer (as well as cervical and genital malignancies) is hypothesized. The aim of this study was to determine the association of HPV-16 and HPV-18 with prostate cancer and malignancy degree. Methods: A total of 75 consecutive paraffin-embedded blocks including 50 samples with primary prostate cancer and 25 samples with benign prostate hyperplasia (BPH) as control were studied. Amplisense kit was used for replication at real-time polymerase chain reaction (PCR) to determine genotypes of HPV-16 and HPV-18. DNA purity was assessed by Nano Drop. Results: The results of real-time PCR demonstrated that none of the samples of BPH and prostate cancer had amplification of HPV DNA. Conclusion: The results revealed that HPV-16 and HPV-18 are not causes of prostate cancer.
- انتشار مقاله: 29-01-1396
- نویسندگان: Elham Jafari,Shariar Dabiri,Abbas Mortazaeizadeh,Ahmad Reza Sayadi,Sahar Amir Poor Rostami
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Game Theory,Financial chain,government policy-making,risk-neutral,risk-averse
- چکیده:
- چکیده انگلیسی: This research analyzes the competition of two risk-neutral and risk-averse centralized financial chains (FCs) while the government regulates the market to prevent the disproportionately costly interest rates by eliminating unreasonable arbitration of transactions. Each FC consists of an investor and a broker, helping to fund the financial needs of the capital-constrained firms. Utilizing the Stackelberg game theory method, we formulate two-level and three-level optimization models for four potential scenarios and create an integrative structure for evaluating scenarios through the perspectives of both FCs’ risk orientations (i.e. risk-neutral and risk-averse) and two policies of the government (i.e., deregulation and regulation to mitigate the effect of arbitration). We found that under the government’s regulation policy, risk-averse FCs cause a lower amount of arbitration than risk-neutral FCs. We also realized that the increased volume of risk-free interest rate results in less arbitration. Results also demonstrate that the regulator can organize the competing FCs in the market by enforcing limits on interest rate and restricting costly interest rates by controlling the impacts of arbitration, which ensures a steady economy and encourages the funding of capital-constrained businesses.
- انتشار مقاله: 07-01-1399
- نویسندگان: Raziyeh Reza-Gharehbagh,Ashkan Hafezalkotob,Ahmad Makui,Mohammad Kazem Sayadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Mixed Integer Programming,Closed-loop supply chain,perishable products,forward and reverse logistics
- چکیده:
- چکیده انگلیسی: Recently, following the raise in expense pressures led to lower economic growth, an increasing number of manufacturers have begun to investigate eventuality of handling returned product in a more cost-effective and proper procedure. Significance of Reverse Logistics (RL) is becoming greater due to various governmental, societal, and environmental reasons. Number of papers present in the literature on RLs is a well index of its importance. In some industries, appropriately collected returned products could be used as raw material for another product, increasing Supply Chain (SC) profits and reducing the waste. Since, perishable goods have a limited shelf -life, they can be reusable if they are collected before they reach a critical time. Accordingly, in the present study, a Mixed Integer Linear Programming (MILP) model was introduced for a network of closed-loop SC with recycling of returned perishable goods, involving suppliers, producers, retailers, together with collection and disposal centers, in a multi-product, multi-period, and multi-level basis. To do this, a case study was performed on milk and yogurt products of a company in dairy industry. The model was solved and analyzed using GAMS software. Results obtained from assessment of the model indicated that, timely collection of perishable goods and their use in production of new products reduces total costs of perishable SC network.
- انتشار مقاله: 24-01-1398
- نویسندگان: Sepideh Khalafi,Ashkan Hafezalkotob,Davood Mohamaditabar,Mohammad Kazem Sayadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Meta-Heuristic Algorithms,particle swarm optimization,Simulated Annealing,Cellular manufacturing problem
- چکیده:
- چکیده انگلیسی: Cellular manufacturing system, an application of group technology, has been considered as an effective method to obtain productivity in a factory. For design of manufacturing cells, several mathematical models and various algorithms have been proposed in literature. In the present research, we propose an improved version of discrete particle swarm optimization (PSO) to solve manufacturing cell formation problem effectively. When a local optimal solution is reached with PSO, all particles gather around it, and escaping from this local optimum becomes difficult. To avoid premature convergence of PSO, we present a new hybrid evolutionary algorithm, called discrete particle swarm optimization-simulated annealing (DPSO-SA), based on the idea that PSO ensures fast convergence, while SA brings search out of local optimum. To illustrate the behavior of the proposed model and verify the performance of the algorithm, we introduce a number of numerical examples. The performance evaluation shows the effectiveness of the DPSO-SA.
- انتشار مقاله: 20-10-1393
- نویسندگان: Ashkan Hafezalkotob,Maryam Amiri Tehranizadeh,Fatemeh Sarani Rad,Mohammad Kazem Sayadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Health Sciences and Surveillance System
- نوع مقاله: Journal Article
- کلمات کلیدی: Sleep disorders,Muscle Relaxation,Gestational diabetes,Preeclampsia,High risk pregnancy,Fetal outcomes
- چکیده:
- چکیده انگلیسی: AbstractBackground: Sleep disorders like snoring, mouth breathing, andinsomnia are frequent in pregnancy and studies have shown thatpoor sleep is linked to obstetric complications. Muscle relaxationtechnique is an effective method used for improving sleepquality. The purpose of this study was to determine the effectof muscle relaxation technique on fetal outcomes in complicatedpregnancies with sleep disorders.Methods: This study was performed as a clinical trial on 160pregnant women who suffered from preeclampsia and gestationaldiabetes. The participants filled the Pittsburgh Sleep QualityIndex (PSQI) in order to measure the quality and patterns oftheir sleep. The participants with the total score of 5 or morewere included in the present study. Intervention group were askedto use muscle relaxation technique twice a week at home for 8weeks alongside the routine care. Study variables included sleepquality, Apgar scores, birth weight, levels of Interleukin- 6 (IL-6), as well as umbilical cord PH and PO2.Results: The mean score of PSQI before the intervention was9.28±4.16 and 9.18±3.06 in the intervention and control groupswithout a significant difference (P=0.6), respectively. However,PSQI global score of the experimental group was smaller than thecontrol group at the end of the study (P<0.001). Also, birth weight(P=0.04), Apgar score (P=0.01), and umbilical cord blood po2(P=0.03) and PH (P=0.01) were higher, and IL-6 (P=0.04) wassmaller in the experimental group compared to the control group.Conclusion: The results of this study showed that musclerelaxation, as a simple, inexpensive and safe method, canimprove the fetal outcomes such as birth weight, Apgar score,cord blood po2, and cord blood PH, and also it leads to lowerIL-6 in complicated pregnancies.
- انتشار مقاله: 24-12-1394
- نویسندگان: Azar Nematollahi,Farideh Vaziri,Nasrin Asadi,Mona Doracvandi,Mehrab Sayadi
- مشاهده