mohammadjavad zarei

Noise pollution is a significant challenge in developing the use of wind turbines, especially in residential areas. H-Darrieus turbine is a wind turbine widely used in residential areas, usually exposed to variable wind speeds, and works in a wide range of tip speed ratios. In this article, the importance of tip speed ratio on the output power and noise pollution of an H-Darrieus turbine is numerically investigated using the SST-kω model (for flow simulation at tip speed ratios of 2.04 to 3.3) and the Ffowcs Williams-Hawkings equations (for noise calculation in far-field). The directivity results show that the angle position of maximum noise differs for different tip speed ratios. Therefore, noise calculation only at the angle position of 0o, widely used for wind turbines, is insufficient. The results show that in terms of noise pollution, tip speed ratios of 2.04 and 3.3 have the best and worst performances, with maximum noises of 67.91 dB and 71.85 dB, respectively. On the other hand, the tip speed ratio of 2.64 has the highest power (2.92 times the power of 2.04) with a maximum noise of 68.26 dB, which is negligibly higher than that for the tip speed ratio of 2.04. Overall, it is concluded that in terms of compromise between noise pollution and power generation, the tip speed ratio of 2.64 is the best point for this turbine.

Even though naloxone is the main treatment for methadone poisoning treatment there are controversiesabout the proper method of its tapering. This study aimed to compare two methods in this regard.

Thisstudy was a prospective, single-blind pilot quasi-experimental study on non-addicted adult patients poisoned withmethadone. Patients were randomly divided into 2 groups. In one group, after stabilization of respiratory conditionsand consciousness, naloxone was tapered using the half-life of methadone and in the other group, naloxone was taperedusing the half-life of naloxone. Recurrence of symptoms and changes in venous blood gas parameters were comparedbetween groups as outcome.

52 patients were included (51.92% female). 31 cases entered Group A (taperingbased on methadone’s half-life) and 21 cases entered Group B (tapering based on naloxone’s half-life). The two groupswere similar regarding mean age (p = 0.575), gender distribution (p = 0.535), the cause of methadone use (p = 0.599),previous medical history (p = 0.529), previous methadone use (p = 0.654), drug use history (p = 0.444), and vital signson arrival to emergency department (p = 0.054). The cases of re-decreasing consciousness during tapering (52.38% vs.25.81%; p = 0.049) and after discontinuation of naloxone (72.73% vs. 37.50%; p = 0.050) were higher in the tapering basedon naloxone half-life group. The relative risk reduction (RRR) for naloxone half-life group was -1.03 and for methadonehalf-life group was 0.51. The absolute risk reduction (ARR) was 0.27 (95% confidence interval (CI) = 0.01-0.53) and thenumber needed to treat (NNT) was 3.7 (95% CI= 1.87- 150.53). There was not any statistically significant difference be-tween groups regarding pH, HCO3, and PCO2changes during tapering and after naloxone discontinuation (P > 0.05).However, repeated measures analysis of variance (ANOVA), showed that in the tapering based on methadone’s half-lifegroup, the number of changes and stability in the normal range were better (p < 0.001).

It seems that, bytapering naloxone based on methadone’s half-life, not only blood acid-base disorders are treated, but they also remainstable after discontinuation and the possibility of symptom recurrence is reduced.

Brugada syndrome (BrS) is a disorder in which the electrical activity in the heart is abnormal and affects individuals with cardiac dysrhythmia. In the present study, we introduce a case diagnosed with BrS, admitted to intensive care unit (ICU) and received treatments following sudden cardiac arrest.

Case Report: 

The patient was a male 25-year-old medical student enrolled in the sixth academic year who suffered from loss of consciousness due to sudden cardiac arrest. The patient immediately received cardiopulmonary resuscitation (CPR) measures, was visited by a cardiologist and a neurologist, and was consequently treated with medications. After an 8-day stay in the coronary care unit (CCU), the patient regained his level of consciousness and he was transferred to the ICU of Faghihi hospital in the city of Shiraz, Iran. Being diagnosed with BrS and following pulmonary aspiration treatments, he finally implanted with an implantable cardioverter defibrillator (ICD).

Fortunately, necessary measures had been taken on time for the introduced patient and he was discharged with full recovery after 6 days

Liquid desiccants such as glycols are used in dehydration process, among which Triethylene Glycol (TEG) is considered as a common choice. The addition of nanoparticles to TEG as the base fluid is one of the prevalent method to improve thermal properties of TEG. In this study, an experimental investigation was performed on thermal conductivity of TEG-based nanofluids with 20 and 40 nm diameter copper oxide (CuO) nanoparticles analyzed at different conditions. Thermal conductivity was measured using a Decagon thermal analyzer (KD2 Pro Model) in the 20 °C-60 °C temperature range, and also 0.1- 0.9 wt.% range. The experimental results showed that thermal conductivity of the nanofluid enhances with temperature increasing. In addition, thermal conductivity of nanofluids increased with nanoparticle concentration in both cases of 20 and 40 nm nanoparticles. The highest enhancement was also ~ 13.5%, for the nanofluid with 20 nm nanoparticles at 60 °C and a 0.9 wt.% concentration.