s. hasanzadeh

Hybrid switch reluctance motors are the family of switch reluctance motors (SRMs) that attenuate the magnetic saturation and increase the air gap magnetic flux by exploiting permanent magnets. The permanent magnet auxiliary air gap flux can affect the average torque and ripple. Commonly, the torque ripples reduction comes with the average torque drop. In this paper, the torque ripple reduction and average torque improvement are achieved for a 6/10 pole hybrid switch reluctance motor by inserting two symmetrical notches on its rotor. Also, the lengths of magnet and rectangular notches are optimized by the finite element method and sensitivity analysis. The comparison of the optimized design with the initial one carried out by finite element proves the efficiency of the proposed model.

Nowadays, with the increase of population, demand for efficient public transportation systems has increased. Magnetic levitation (maglev) trains are one of the best choices for the future. There are three separated systems in a classical magnetic train to achieve desirable performance. Hence, several control systems and sensors are essential for train operation. Accordingly, the classical maglev trains include complex structures, and they are so expensive. This paper presents the design, optimization, and control of a combined magnetic train structure with the integrated performance of suspension and guidance and a complementary propulsion system. These combined topologies provide a simple design, more convenient movement, and reduce construction and operation costs.

Over the past four decades of developing superconducting machines, many topologies have been suggested. The most successful topology of high-power superconducting (HPS) machines is an air-cored radial flux synchronous machine. There are two possible topologies for this type of machine, rotational field, and stationary field. In this paper, the relative advantages and disadvantages of these topologies are compared in detail. Analytical study of these topologies shows that the inversed machine topology leads to more efficient high-temperature superconductor (HTS) wire utilization and hence more economical production. In order to confirm the result obtained by analytical calculations, 2-D finite element model (FEM) of the machine is utilized.

In the design of recommender systems, it is believed that the set of reviews written by a user can somehow reveal his/her interests, and the content of an item can also be implied from its corresponding reviews. The present study attempts to model both the users and the items via extracting key information from the existing textual reviews. Based on this information, a fuzzy rule-based classifier is designed and tuned, which aims to predict whether a typical user will be interested in a typical item or not. For this purpose, the set of all reviews belonging to a user are mapped to a vector representing the user's interests. Similarly, the set of reviews written by different users over an item are merged and mapped to a vector representing the item. By conjoining these two vectors, a longer vector is obtained which will be used as the input of the classifier. To optimize the classifier, an adaptive approach is suggested and rule-weight learning is carried out, accordingly. The performance of the proposed fuzzy recommender system was evaluated on the Amazon dataset. Experimental results narrate from the promising classification ability of the proposed recommender system compared to state of the art.

Constipation is an important problem and dysfunction of the digestive system. In the traditional beliefs of different parts of the world, especially Iran, Rosa damascene Mill. has several properties, including sedative, anti-inflammatory, anti-seizure, anti-depressant, and laxative effects. This study aimed to evaluate the effect of hydroalcoholic extract of Rosa damascene Mill. in treating chronic constipation in adults.

This randomized clinical trial was performed in 2018 in Shahid Mofteh Specialized Clinic of Yasouj on 160 patients with chronic constipation referred to internal medicine and gastroenterologists. Extracted hydroalcoholic extract of Rosa damascene Mill. and lactulose syrup was used; The control group received 20cc of lactulose syrup twice a day, and the intervention group received a hydroalcoholic extract of Rosa damascene Mill. two times a day in the form of 500mg capsules twice a day for one month. Data were analyzed using SPSS 19 software and T and chi-square tests with 95% confidence interval.

During the intervention process, 16 people did not refer to the necessary follow-up, and the necessary information was collected from 144 patients with chronic constipation. Sixty-eight patients (4.2%) were male, and 76 (52.8%) were female. The mean age of patients was 43.18±13.67, and the age range was 18 to 75 years. There was no statistically significant difference between the two groups' mean age and sex under Rosa damascene Mill.'s intervention. Hydroalcoholic extract and lactulose (p<0.05). Also, there was no statistically significant difference between the variables of frequency and ease of defecation between the two groups receiving lactulose and Rosa damascene Mill. hydroalcoholic extract before and after the intervention (p<0.05).

Hydroalcoholic extract of Rosa damascene Mill. has a similar effect to lactulose in the treatment of chronic constipation in adults.

Staphylococcus aureus can colonize a variety of body sites such as skin, coetaneous membrane and especially the anterior nares.  The coagulase gene (coa) typing is a technique in which the organism is typed based on the polymorphic region of the coa gene. The aim of the present study was to determine the coa based typing of S. aureus isolates from health care workers in two teaching hospitals in Yasuj city.

 In the present cross- sectional study, a total of 125 S. aureus isolates were collected from the nasal nares of healthcare workers in Shahid Beheshti and Imam Sajjad Hospitals in Yasuj city. For typing of S. aureus isolates, amplification of the 3'-end region of the coa gene was performed. Finally, PCR products were digested with HaeIII restriction enzymes and then were electrophoresed on 1.2% agarose gel, and visualized under UV illumination. Bacterial strains were typed according to the DNA bands with diverse size and numbers in each strain. Data were analyzed by descriptive statistics tests.

 Amplification of the coa gene indicated single band in nine different patterns ranging approximately from 400 to 860 base pair. The coa gene with 610 bp size was seen in 36 isolates and was considered a predominant type. After digestion of PCR products with HaeIII restriction enzymes, totally 15 distinct coa gene RFLP patterns, numbered C1 to C15, were coa observed. The C3 was the most frequent coa type with 24 isolates. There is no specific types belong to wards or professions in each hospitals.

S. auras isolated from anterior nares of HCWs showed genetic diversity in their coa gene, but only a few coa gene variants were predominant. Hence no prominent coa type was detected according to the wards or types of profession, the sources of bacteria for colonization in anterior nares of HCWs may be related to the hospital, probably the outside environment.