Novel coronavirus 2019 infection is a new coronavirus disease (1). This disease started in China then it is imported to several countries. As a new disease, . . .

The need to design blast resistant civilian structures has arisen due to aggressor attacks on many civilian structures around the world. Achieving vibration and wave attenuation with locally resonant metamaterials has attracted a great deal of consideration due to their FREQUENCY dependent negative effective mass density. In this paper, metaconcrete, a new material with exceptional properties is formed. The aggregates in concrete are substituted with spherical inclusions consisting of a heavy metal core coated with a soft outer layer. The physics of the metamaterial was first established, and mass in mass spring and effective mass system were shown to be equivalent. Then the engineered aggregate was tuned so that band gap was activated due to resonant oscillations of the replaced aggregate. In the numerical experiment conducted, the resonant behaviour causes the wave to be forbidden in the targeted frequencies. The proposed metaconcrete could be very useful in various civil engineering applications where vibration suspension and wave attenuation ability are in high demand.

Background: Identification of the causes of gallstone would result in better planning for the prevention of this disease. One of the proposed risk factors for this problem is Helicobacter pylori(H. pylori) infection. Objectives: The purpose of this study was to determine the incidence rate of gallstone in patients with H. pylori gastritis. Methods: This was an observational study performed as a descriptive-comparative cross-sectional survey. We enrolled 169 consecutive patients with H. pylori gastritis admitted to Imam-Hossein Hospital, Tehran, Iran, in 2018, and gallstone FREQUENCY in them was determined and compared with other variables. Results: Overall, 14 (8. 3%) patients had gallstone, and all the patients had H. pylori gastritis. There was no significant association between gallstone and H. pylori gastritis (P = 0. 561). Conclusions: It may be concluded that gallstone FREQUENCY in patients with H. pylori gastritis is low, and there is no significant association between these two conditions.

The fundamental FREQUENCY of a rectangular orthotropic plate having an arbitrary thickness variation is computed by using the method of Modified Vibrational Mode (MVM) shapes. The change of thickness within a plate is characterized by introducing a tapering index. It is shown that the vibrational mode shapes of a tapered plate is in fact a linear combination of various mode shapes of intact plates. This phenomenon is used to estimate the vibrational mode shapes of stepped plates. In turn, these mode shapes are incorporated to evaluate their fundamental FREQUENCY. Many numerical analyses are carried out to represent the accuracy and robustness of the proposed method by comparing the results to the works presented by other researchers. The major advantage of the present method over the existing ones is its simplicity for handling the problem of force vibration of tapered plates.

Background: Trigeminal neuralgia is one of the most painful conditions in the head and face. This study was carried out to evaluate the effects and results of RF therapy on patients with trigeminal neuralgia who referred to Amir-alam Hospital. Materials and Methods: In this descriptive study, 84 patients with trigeminal neuralgia pain were studied. Patients were diagnosed based on their medical histories, physical examination, and paraclinical tests. Patients are admitted according to internationally accepted criteria such as the International Headache Society (IHS). The patients responded to the questions in the questionnaire before and after the surgery. In this questionnaire, the pain level of patients is assessed by the Visual Analogue Pain Scale (VAS). Results: The mean pain score before treatment was 7. 87, which decreased to 4. 83 after the treatment. According to the results obtained in this study, 18 patients (21. 4%) felt 4 levels of decrease in pain, as the predominant level of relief. Also, 15 patients (17. 9%) did not feel any subtraction of pain after the treatment. Of the 84 patients, only 1 patient experienced the reduction of pain as 9 levels of VAS, after the treatment. There was a significant relationship (P=0. 000) between the pain severity and the reduction in the amount of pain after the RF in respect to the amount before the treatment. Also, in the regression equation obtained from the study of the effects and role of patients’ age, gender, as well as the history of pain in patients before the RF treatment, only the gender of the patients had a significant relationship with the amount of pain reduction and comparison of its pre and post treatment. (P=0. 054) and (B=-0. 886) and (β =-0. 216). Also, there was no significant relationship between pain intensity (P=0. 761), age of patients (P=0. 829), or history of pain (P=0. 139) with pain reduction and comparison of pain intensity before and after RF treatment. During the treatment of RF, very few side effects was reported. Conclusion: According to the results, RF treatment is an effective method for reducing pain in both short-term and long-term pain, in patients with trigeminal neuralgia. It is suggested that in patients suffering from the pain resulting caused by trigeminal neuralgia, due to drug resistance or who are intolerance to possible adverse effects, or in patients with lack of response from drug therapy, the therapeutic approach of RF is a valuable way for pain relief.

Background: Chronic renal failure is an important and common complication of diabetes mellitus. Therefore, renal transplantation is a frequent and the acceptable treatment in patients with diabetic nephropathy requiring renal replacement therapy. On the other hands, renal transplantation and its conventional treatment can lead to increased diabetes outbreak in normoglycemic recipients. Also, uncontrolled hyperglycemia may increase allograft loss and decreased patient survival.Objective: To assess the FREQUENCY of hyperglycemia in transplant patients and its risk factors.Methods: A large retrospective study was performed in 3342 adult kidney transplant recipients between 2008 and 2010. Demographic and laboratory data gathered for each patient. All tests were done in a single laboratory. Hyperglycemia was defined as fasting plasma glucose>125 mg/dL. Univariate and multivariate logistic regression analyses were used to determine the risk factors of hyperglycemia following kidney transplantation.Results: There were 2120 (63.4%) men and 1212 (36.3%) women. The prevalence of hyperglycemia was 22.5%. By univariate linear regression, hyperglycemia was significantly higher in patients with CMV infection (p=0.001), elevated serum creatinine (p<0.001), low HDL (p=0.01), and increased blood levels of cyclosporine (p<0.001). After adjusting for covariates by multivariate logistic regression, the hyperglycemia rate was significantly higher for patients with cyclosporine trough level>250 (p<0.001), serum creatinine>1.5 (p<0.001) and HDL<45 (p=0.03).Conclusion: Hyperglycemia is a common metabolic disorder in Iranian kidney transplant patients. Risk factors for hyperglycemia were higher cyclosporine level, impaired renal function, and reduced HDL value.