Distribution system simulator

In a series of tests performed under the Department of Energy auspices, power line carrier propagation was observed to be anomalous under certain circumstances. To investigate the cause, a distribution system simulator was constructed. The simulator was a physical simulator that accurately represented the distribution system from below power frequency to above 50 kHz. Effects such as phase-to-phase coupling and skin effect were modeled. Construction details of the simulator, and experimental results from its use are presented

Relationship between clarity of role and job commitment among the personnel of the colleges of Isfahan University of Medical Sciences

چکیده: زمینه و هدف: منابع انسانی مهمترین و با ارزش‌ترین منابع یک سازمان محسوب می‌شوند. وضوح و شفافیت نقش، می تواند موجب رضایت و احساس دلگرمی و مفید بودن فرد و در نهایت انجام بهتر و دقیق‌تر کارها شود. این مطالعه به منظور بررسی رابطه شفافیت نقش و تعهد شغلی کارکنان دانشکده های دانشگاه علوم پزشکی اصفهان انجام شده است. روش بررسی: برای انجام این مطالعه توصیفی-تحلیلی 144 نفر با استفاده از روش طبقه ای تصادفی از بین کلیه کارکنان دانشکده های پزشکی دانشگاه علوم پزشکی اصفهان (401 نفر) انتخاب شدند. اطلاعات با استفاده از دو پرسشنامه ی شفافیت نقش و تعهد شغلی جمع آوری گردید. روایی پرسشنامه ها با روش روایی محتوا و پایایی آنها با روش ضریب آلفای کرونباخ محاسبه گردید. داده ها با استفاده از آزمون های آماری t تک متغیره، ضریب همبستگی پیرسون و t2 هتلینگ مورد تجزیه و تحلیل قرار گرفت. یافته ها:بر اساس یافته‌های پژوهش میانگین نمرات حاصل از پرسشنامه شفافیت نقش (52/0±76/2) و تعهد شغلی (41/0±39/3) بالاتر از حد متوسط بود (01/0

Effect of valerian capsules in patients with migraine attacks treated with sodium valproate: a randomized clinical trial

Background and aims: Nowadays so many preventive drugs for migraine with different effects are used all around the world. One of the plants that are used traditionally in the treatment of migraine is Valeriana officinalis. The present study was aimed to evaluate the effect of valerian capsule (350 mg, three times daily) on frequency, duration and intensity of migraine attacks. Method: The present study is a Randomized, single-blind clinical trial that is carried out on 84 female patients suffering from migraine headaches. The patients were randomly allocated to case (n=42) and control groups (n=42) and treated during three consecutive phases of 45 days. In the first phase, both groups received sodium valproate tablet, (200 mg, twice daily) and indomethacin capsule (25 mg, in attacks). In the second phase, valerian capsule (350 mg, three times daily) was added to other drugs of case group. Control group received placebo instead of valerian. Finally, in the third phase, both groups were treated the same as the first phase. And then the data obtained from the drug influence on pain intensity were analyzed based on Mann-Whitney and K2. Results: All 84 patients cooperated to the end of study. The results indicated that valerian capsule significantly reduced the frequency, duration and intensity of migraine attacks in a way that the mean of migraine attacks reduced from 6.2±2.3 to 2.2±1.2, the duration reduced from 17.0± 9.2 to 5.7±3.7 hours and intensity from 8.7±1.2 to 3.0±1.3. Conclusion: According to the remarkable effect of valerian capsule on the prevention of migraine attacks, it seems that it can be a potential alternative to common migraine medications

Effect of fasting on levels of subjective stress among nurses working in emergency departments of hospitals in chahar mahal and bakhtiari‏

Background: High levels of stress in nurses, known as a factor influencing the level of job satisfaction and can result in poor performance and dissatisfaction of patients. Therefore, the use of stress reduction programs, such as adherence to religion and religious teachings seriously, to protect and prevent health problems, it is very necessary and inevitable. Objectives: The aim of this study is to investigate the effect of fasting on the subjective stress level of nurses working in emergency departments is subjective. Materials and Methods: This study was a prospective study that performed on 110 nurses working in emergency departments of hospitals in Chahar Mahal and Bakhtiari. Sampling method was Simple and the sample of this study was the same. To gathering of information demographic and subjective stress questionnaire was used to measure subjective stress. Questionnaires completed in 3 phases: before, half and after the Ramadan. For data analyzing descriptive and inferential statistics such as t-test and the test based on Friedman repeated SPSS software data were used. Results: The results of this study showed before Ramadan, subjective stress level of emergency nurses was 23.48 ± 14.52 and in the middle of Ramadan 20.65 ± 9.96 and after Ramadan 7.55 ± 4.64.These figures indicate the end of Ramadan, the subjective stress level as low as emergency nurses as it has been before and middle of Ramadan. Discussion: The results of this study showed that a positive impact of Ramadan fasting on improving the subjective health of emergency nurses. Due to the sensitivity of Professional nurses, are constantly affected by stress and if this group, note not to physical and mental health, this would in turn improve

Relationship between platelet parameters and sudden sensorineural hearing loss: a systematic review and meta-analysis

Background: Sudden deafness or sudden sensorineural hearing loss (SSNHO is defined as sensorineural hearing loss of greater than 30 dB over 3 contiguous puretone frequencies occurring within 3 days' periodObjective: To investigate the relationship of some platelet parameters including platelet count (PC), mean platelet volume (MPV) and platelet distribution width (PDW) with the occurrence of SSNHL.Data source: A PubMed, Science Direct, Scopus, OVID, EMBASE and Google Scholar search (date last searchedApril2016) search was done. No restrictions of time, language and location were placed.Study selection: All case-control studies which have been studied the relationship of PC, MPV and PDW with the occurrence of SSNHL were included in the meta-analysis.Data extraction: The required data from selected studies including the title, authors, publication date, location of study, sample size of patients and control groups, number of withdrawals, the mean and standard deviation of PC, MPV and PDW for patients and control groups and the result of different tests were extracted and entered to EX CELL.Data synthesis: A total of 9 case-control studies were r found in our search from them 8 studies have reported mean PC, 7 studies have reported mean MPV and 4 studies have reported mean PDW. Our analysis showed that mean PC of patients is 0.03 (-0.14-0.20) unit higher than that of controls with 95% CI which is not statistically significant. Also, mean MPV of patients is 0.31 (-0.03-0.65) unit higher than that of controls with 95% CI which is statistically not significant too. Finally, mean PDW of patients is 0.70 (0.03- 1.37) unit higher than that of controls with 95% CI which is statistically significant.Conclusions: Our study confirmed only the probable relationship of PDW and SSNHL but due to the limited studies on this subject more studies is needed

Are collapse models testable with quantum oscillating systems? The case of neutrinos, kaons, chiral molecules

Collapse models provide a theoretical framework for understanding how classical world emerges from quantum mechanics. Their dynamics preserves (practically) quantum linearity for microscopic systems, while it becomes strongly nonlinear when moving towards macroscopic scale. The conventional approach to test collapse models is to create spatial superpositions of mesoscopic systems and then examine the loss of interference, while environmental noises are engineered carefully. Here we investigate a different approach: We study systems that naturally oscillate --creating quantum superpositions-- and thus represent a natural case-study for testing quantum linearity: neutrinos, neutral mesons, and chiral molecules. We will show how spontaneous collapses affect their oscillatory behavior, and will compare them with environmental decoherence effects. We will show that, contrary to what previously predicted, collapse models cannot be tested with neutrinos. The effect is stronger for neutral mesons, but still beyond experimental reach. Instead, chiral molecules can offer promising candidates for testing collapse models.Comment: accepted by NATURE Scientific Reports, 12 pages, 1 figures, 2 table