در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Health Sciences and Surveillance System
- نوع مقاله: Journal Article
- کلمات کلیدی: mental health,Mercury,Dentist
- چکیده:
- چکیده انگلیسی: AbstractBackground/Objective: This study was undertaken to addresspsychological health effects of dentists’ exposure to low ambientlevels of mercury.Methods: One hundred and six dentists and 94 generalpractitioners were randomly selected from clinics in Shiraz city,Iran. Subjects were asked to complete the Persian version ofGeneral Health Questionnaire. The data were analyzed usingχ2 test, independent sample t-test and Mann-Whitney’s U test.Results: Both groups were similar as far as all demographicvariables, except age, were concerned. No significant differencewas noted between the dentists’ mean total score of GHQ-28 (17.9)and that of referent subjects (16.34). These scores were significantlylower than the cut-off point of 23 (P<0.01). The mean scores forsomatic symptoms, anxiety and insomnia, and depression weresignificantly higher in dentists than in the referent subjects. Theresults also showed a significant association between GHQ-28total scores and length of exposure to mercury (P=0.034); withincrease in the job tenure, GHQ-28 total score also increased,indicating a decrement in psychological health status.Conclusion: The current findings revealed that, in general,the dentists’ psychological health status was poorer than thereferent subjects. Additionally, in all GHQ subscales, thedentists’ scores were significantly different from those of theircounterparts. Given the fact that exposure to mercury is the mostimportant differentiating variable between both groups, and thatneuropsychological disorders are the most common toxic effectof mercury, the difference between psychological health statusof the two groups is likely to be related to exposure to mercury.Please cite this article as: Choobineh AR, Neghab M, Rostami R, HassanzadehJ, Soleimani E, Daneshmandi H. The Relationship between Mercury Exposureand Psychological Health Status of Dentists. J Health Sci Surveillance Sys.2013;1(1):27-32.Keywords: Dentist; Mental health; Mercury
- انتشار مقاله: 15-05-1392
- نویسندگان: Alireza Choobineh,Masoud Neghab,Reza Rostami,Jafar Hassan Zadeh,Esmaeel Soleimani,Hadi Daneshmandi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Finance
- نوع مقاله: Journal Article
- کلمات کلیدی: Wavelet Analysis,Company Size,Beta,BV/MV ( The ratio of book value to market value)
- چکیده:
- چکیده انگلیسی: The aim of this paper is to analyze the multiscale pricing model with the wavelet analysis approach, Fama-French three-factor model, and nonliquidity in Tehran Stock Exchange. It was also desirable to figure out how stock returns, Fama-French factors, and nonliquidity were related in different intervals. According to the results, various outcomes were obtained at different intervals. Stock returns had significant relationships with (the ratio of book value to market value) and nonliquidity in the long term. Stock returns had significant relationships with the beta, , and company size in the midterm, too. There was also a significant relationship between stock returns and the company size in the short term. The proposed methodology suggests that investors should employ dynamic portfolio management strategy and multiscale risk-return evaluation to seize investment opportunities.
- انتشار مقاله: 11-10-1348
- نویسندگان: Mohammadreza Rostami,Reyhane Pouyanfard,Maryam Hashempour
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Finance
- نوع مقاله: Journal Article
- کلمات کلیدی: Stock Returns,GARCH,Granger Causality,Causal Relationships,Volume of trade,Return Volatility,Vector Auto Regression model
- چکیده:
- چکیده انگلیسی: Identifying the causal relations between trading volume and stock returns and between trading volume and return volatility plays a vital role in identifying profitable investment opportunities. In this study, the Granger causality test was conducted to analyze the causal relationships between the mentioned variables in Tehran Stock Exchange. Consequently, the Vector Auto Regression (VAR) model was employed to determine the conditional mean equations of returns and volume. Moreover, the bivariate Generalized Autoregressive Conditional Heteroskedasticity (GARCH) model was used to model the conditional variance equation, stating the relationship between volume and return volatility. According to the results, no bilateral causal relationship can be ascertained between returns, volume, and return volatility. In other words, return and return volatility could barely predict volume; therefore, volume cannot be the Granger causality of the other two variables. However, stock returns were found to have an important role in determining the volume. Likewise, return volatility can be used to predict volume accurately. In fact, stock returns and the return volatility were both the Granger causalities of the volume.
- انتشار مقاله: 11-10-1348
- نویسندگان: Mohammad Reza Rostami,Peyman Alipour,Adel Behzadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Cationic surfactant,wettability alteration,n-dodecyltriethylammonium bromide (DTEAB),Critical micelle concentration (CMC),Core displacement
- چکیده:
- چکیده انگلیسی: Wettability alteration is an important mechanism when applying surfactants during enhanced oil recovery (EOR). Moreover, in carbonate reservoirs, the rock has more tendencies to be oil-wet than those of sandstone reservoirs. This mainly arises from the interaction amongst the carbonate surface chemistry exposed to the asphaltenic/aromatic components of crude oil. Therefore, it is of great significance to develop surfactants with high efficiency in wettability alteration of carbonate rocks. In this work, a cationic surfactant n-dodecyl trimethylammonium bromide (DTEAB), was prepared and applied in a wettability alteration experiment for the first time. Then, the critical micelle concentration and wettability properties were studied by means of electrical conductivity and sessile drop techniques, respectively. Consequently, it was observed that this surfactant can alter the wettability of Bangestan rock pellets from oil-wet to water-wet state, and the results are better than that of wettability alteration observed for Khark rock pellets. Based on this mechanism, nearby 22% Original Oil in Place (OOIP) was obtained by tertiary surfactant flood during core displacement in excess of ultimate recovery factor of secondary water injection. As a consequence, the suggested cationic surfactant in this study can be a good agent for increasing the oil recovery factors in the petroleum industry.
- انتشار مقاله: 28-09-1397
- نویسندگان: Ghassem Zargar,Mohammad Ali Takassi,Siamak Moradi,Ali Reza Rostami,Babak Jabari
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Smart Electrical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Individual upper alpha band,N-back test,neurofeedback,Parietal lobe,Working memory performance
- چکیده:
- چکیده انگلیسی: Working memory (WM) is a part of human memory, the ability to maintain and manipulate information. WM performance is impaired in some neurological and psychiatric disorders such as schizophrenia and ADHD. Neurofeedback training is a self-regulation method which can be used to improve WM performance by changing related EEG parameters. In this paper we used neurofeedback training to improve WM performance in eight healthy individuals. The protocol was consisted of individual upper alpha up-training in parietal brain lobe of participants which is a part of fronto-parietal network and related to central executive functions of WM. Power of individual upper alpha band in channels P3 and P4 was used for neurofeedback training in five sessions. 2-back working memory test was used to measure WM performance before and after the course. Results indicated success of subjects in neurofeedback training and enhancement of individual upper alpha power in both channels (P3 and P4). Results of 2-back test indicated that improvement in response accuracy and response time of test was significant. Also the correlation between the change in power of individual upper alpha band in channel P3 and change in response time of 2-back test was significant approximately (r= -0.571 and P=0.076). In conclusion it seems that individual upper alpha neurofeedback up-training in parietal lobe is an appropriate method to improve WM performance.
- انتشار مقاله: 18-02-1397
- نویسندگان: Peyman Dehghanpour,Fardad Farokhi,Reza Rostami
- مشاهده
- جایگاه : پژوهشی
- مجله: Addiction and Health
- نوع مقاله: Journal Article
- کلمات کلیدی: anxiety,Methamphetamine,depression,Transcranial magnetic stimulation
- چکیده:
- چکیده انگلیسی: Background: Methamphetamine use has been associated with higher rates of depression and anxiety. The
mesocorticolimbic dopaminergic reward system seems to play a crucial role in inducing depression and
anxiety in methamphetamine users. High-frequency repetitive transcranial magnetic stimulation (rTMS) has
been shown to alter dopaminergic neurotransmission considering the acute rewarding and reinforcing effects
in the subcortical structure. The aim of this study was to investigate the efficacy of rTMS in reducing
depression and anxiety symptoms in methamphetamine users.
Methods: In a single-subject method with concurrent multiple baseline designs, in 2017, in Iran, eight
methamphetamine users were included, which compared 15 days of active versus placebo stimulation and
control group. Two subjects received rTMS on the right dorsolateral prefrontal cortex (DLPFC) and two
subjects received rTMS on the left DLPFC. We carried out the measurement using the Beck Anxiety Inventory
(BAI) and Beck Depression Inventory (BDI) before, during, and after 15 and 30 days of the procedure.
Findings: Right and left DLPFC stimulation significantly reduced depression and anxiety, but the reduction
of depression and anxiety by the right DLPFC stimulation was noticeable in this study.
Conclusion: High-frequency rTMS is useful for the treatment of depression and anxiety in methamphetamine
users
- انتشار مقاله: 06-11-1399
- نویسندگان: Nastaran Mansouriyeh,Majid Mahmoud-Aliloo,Reza Rostami
- مشاهده